Battery pack configured to be able to power power tool

Abstract

The invention discloses a battery pack configured to supply power to an electric tool. The battery pack comprises: a housing assembly; the plurality of battery cells are arranged in the shell assembly; the first interface is arranged to be detachably connected to first charging equipment and is arranged to be capable of supplying power to the electric tool; the second interface is arranged to be detachably connected with second charging equipment; the power control module is connected with the second interface; wherein the power control module is used for changing the charging power and / or the discharging power of the second interface according to the temperature of the battery pack. By adopting the technical scheme, the battery pack for the electric tool, which is higher in safety and longer in service life, can be provided.

Description

Technical Field

[0001] The present application relates to an energy storage device, and in particular to a battery pack configured to power an electric tool. Background Art

[0002] Portable power tools can be used in a variety of scenarios in production and life. By configuring a rechargeable battery pack to power the power tools, the power tools are freed from the constraints of wires, making them more convenient for users to use. Generally, the interface terminals on the battery pack for external charging / discharging can be docked with the power interface of the power tool, and can also be docked with the charging port of the battery pack charger. With the development of battery pack technology, designing a Type-C interface on the battery pack for power tools has gradually become a new development trend. This allows the battery pack for power tools to power mobile terminals or other electrical devices with a Type-C interface, and can also be charged with a Type-C charger, which brings more development space for the battery pack.

[0003] This section provides background information related to the present application which is not necessarily prior art. Summary of the invention

[0004] In order to address the deficiencies of the prior art, the purpose of the present application is to provide a battery pack for electric tools with higher safety and longer service life.

[0005] In order to achieve the above objectives, this application adopts the following technical solutions:

[0006] A battery pack configured to power an electric tool comprises: a shell assembly; a plurality of battery cells disposed in the shell assembly; a first interface configured to be detachably connected to a first charging device and configured to power the electric tool; a second interface configured to be detachably connected to a second charging device; a power control module configured to be connected to the second interface; wherein the power control module is used to change the charging power and / or discharging power of the second interface according to the temperature of the battery pack.

[0007] In some embodiments, the second interface is a Type-C interface.

[0008] In some embodiments, the power control module includes a temperature detection unit, and the temperature detection unit is used to detect the temperature of the battery pack.

[0009] In some embodiments, the temperature detection unit includes a first temperature detection unit and a second temperature detection unit, the first temperature detection unit is used to detect the temperature of the power control module in the battery pack, and the second temperature detection unit is used to detect the temperature of multiple battery cells in the battery pack.

[0010] In some embodiments, the power control module also includes a management unit and an adjustment unit. The adjustment unit is also connected to multiple battery cells. The management unit is connected to the adjustment unit and a temperature detection unit. The management unit controls the adjustment unit based on the temperature detected by the temperature detection unit and a preset threshold.

[0011] In some embodiments, the regulating unit includes a voltage control module, and the voltage control module is used to reduce the voltage reaching the second interface when the temperature of the battery pack is greater than or equal to a preset threshold.

[0012] In some embodiments, the regulating unit includes a current control module, and the current control module is used to reduce the current reaching the second interface when the temperature of the battery pack is greater than or equal to a preset threshold.

[0013] In some embodiments, the regulating unit includes a voltage control module and a current control module. When the temperature of the battery pack is greater than or equal to a preset threshold, the voltage control module reduces the voltage reaching the second interface, and the current control module reduces the current reaching the second interface.

[0014] In some embodiments, when the temperature of the battery pack is less than a preset threshold and the power of the battery pack is less than the maximum power, the management unit controls the adjustment unit to increase the output power and / or input power of the second interface.

[0015] In some embodiments, the preset threshold includes a first preset threshold and a second preset threshold, the first preset threshold is the temperature threshold of the power control module in the battery pack, and the second preset threshold is the temperature threshold of multiple battery cells in the battery pack; wherein the first preset threshold is greater than the second preset threshold.

[0016] In some embodiments, the nominal voltage of the first interface is greater than 10V, and the discharge voltage of the second interface is greater than or equal to 5V and less than or equal to 20V.

[0017] In some embodiments, the adjustment unit includes a voltage control module, which is used to reduce the voltage reaching the second interface when the temperature of the power control module in the battery pack is greater than or equal to a first preset threshold, or when the temperature of multiple battery cells in the battery pack is greater than or equal to a second preset threshold.

[0018] In some embodiments, the adjustment unit includes a current control module, which is used to reduce the current reaching the second interface when the temperature of the power control module in the battery pack is greater than or equal to a first preset threshold, or when the temperature of multiple battery cells in the battery pack is greater than or equal to a second preset threshold.

[0019] In some embodiments, the adjustment unit includes a voltage control module and a current control module. When the temperature of the power control module in the battery pack is greater than or equal to a first preset threshold, or when the temperature of multiple battery cells in the battery pack is greater than or equal to a second preset threshold, the voltage control module reduces the voltage reaching the second interface and the current control module reduces the current reaching the second interface.

[0020] In some embodiments, when the temperature of the power control module in the battery pack is less than a first preset threshold, the temperatures of multiple battery cells in the battery pack are less than a second preset threshold, and the power of the battery pack is less than the maximum power, the management unit controls the adjustment unit to increase the output power and / or input power of the second interface.

[0021] The benefit of the present application lies in that by changing the charging / discharging power of the second interface based on the temperature of the battery pack, the problem of the battery pack being in a high temperature state for a long time, which brings certain dangers, is solved, and the safety and life of the battery pack are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of a battery pack power supply system according to an embodiment;

[0023] Figure 2 is a schematic diagram of a battery pack charging system according to an embodiment;

[0024] Figure 3 is a schematic diagram of a charging control circuit in a battery pack according to an embodiment;

[0025] Figure 4 is a schematic diagram of a charging control circuit in a battery pack according to an embodiment;

[0026] Figure 5 is a schematic diagram of a power control circuit of a battery pack according to an embodiment;

[0027] Figure 6 is a schematic diagram of another power control circuit of a battery pack according to an embodiment;

[0028] Figure 7 is a schematic diagram of a temperature detection unit of a battery pack according to an embodiment;

[0029] Figure 8 is a schematic diagram of a regulation unit of a battery pack according to an embodiment;

[0030] Fig. 9 The present invention is a flow chart of a control method of a battery pack according to an embodiment. DETAILED DESCRIPTION

[0031] Before any embodiments of the application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the above drawings.

[0032] In this application, the terms "comprises", "includes", "has" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device that includes the element.

[0033] In this application, the term "and / or" is a description of the association relationship between related objects, indicating that three relationships can exist. 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 application generally indicates that the related objects before and after are in an "and / or" relationship.

[0034] In the present application, the terms "connect", "combine", "couple", and "install" may refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, direct connection refers to two parts or components being connected together without the need for an intermediate piece, and indirect connection refers to two parts or components being connected to at least one intermediate piece respectively, and the two parts or components being connected via the intermediate piece. In addition, "connect" and "couple" are not limited to physical or mechanical connections or couplings, and may include electrical connections or couplings.

[0035] In the present application, it will be understood by those of ordinary skill in the art that relative terms (e.g., "about," "approximately," "substantially," etc.) used in conjunction with quantities or conditions include the values ​​and have the meaning indicated by the context. For example, the relative terms include at least the degree of error associated with the measurement of a specific value, the tolerances caused by manufacturing, assembly, and use associated with a specific value, and the like. Such terms should also be considered to disclose a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to plus or minus a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​that do not use relative terms should also be disclosed as specific values ​​with tolerances. In addition, "substantially" may refer to plus or minus a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) on the basis of the indicated angle when expressing a relative angular position relationship (e.g., substantially parallel, substantially perpendicular).

[0036] In this application, it will be understood by those skilled in the art that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0037] In the present application, the terms "upper", "lower", "left", "right", "front", "back" and other directional words are described based on the orientation and positional relationship shown in the accompanying drawings, and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element. It should also be understood that directional words such as upper side, lower side, left side, right side, front side, back side, etc. not only represent the positive orientation, but can also be understood as the lateral orientation. For example, the bottom can include directly below, lower left, lower right, lower front, and lower back, etc.

[0038] In this application, the terms "controller", "processor", "central processing unit", "CPU", and "MCU" are interchangeable. When a unit "controller", "processor", "central processing unit", "CPU", or "MCU" is used to perform a specific function, unless otherwise specified, these functions can be performed by a single unit or multiple units.

[0039] In the present application, the terms “device”, “module” or “unit” may be implemented in the form of hardware or software to achieve specific functions.

[0040] In this application, the terms "calculate", "judge", "control", "determine", "identify", etc. refer to the operations and processes of a computer system or similar electronic computing device (e.g., controller, processor, etc.).

[0041] In this embodiment, a plurality of different types of electric tools 200 can be powered by the battery pack 100 . Figure 1Several common power tools are illustrated, such as an electric drill 200a, a chain saw 200b, a lawn mower 200c, a hair dryer 200d, etc. It should be noted that the power tool 200 can also be a handheld power tool, such as a drill, a pruning machine, a sander, etc. Alternatively, the power tool 200 can also be a bench tool, such as a bench saw, a miter saw, etc. Alternatively, the power tool 200 can also be a hand-push power tool, such as a hand-push lawn mower, a hand-push snow blower. Alternatively, the power tool 200 can also be a riding power tool, such as a riding lawn mower, a riding vehicle, an all-terrain vehicle, etc. Alternatively, the power tool 200 can also be a robot tool, such as a lawn mowing robot, a snow sweeping robot, etc. In some embodiments, the power tool 200 can be an electric drill, an electric light, an electric car, etc. In some embodiments, the power tool 200 can also be a garden tool, such as a pruning machine, a hair dryer, a lawn mower, a chain saw, etc. Alternatively, the power tool 200 may also be a decoration tool, such as a screwdriver, a nail gun, a circular saw, a sander, etc. In some embodiments, the power tool 200 may also be a vegetation care tool, such as a lawn mower, a lawn mower, a pruner, a chain saw, etc. Alternatively, the power tool 200 may also be a cleaning tool, such as a hair dryer, a snow sweeper, a cleaning machine, etc. Alternatively, the power tool 200 may also be a drilling tool, such as a drill, a screwdriver, a wrench, an electric hammer, etc. Alternatively, the power tool 200 may also be a sawing tool, such as a reciprocating saw, a jig saw, a circular saw, etc. Alternatively, the power tool 200 may also be a bench tool, such as a bench saw, a miter saw, a metal cutter, a bakelite milling machine, etc. Alternatively, the power tool 200 may also be a grinding tool, such as an angle grinder, a sander, etc.

[0042] In this embodiment, a variety of different electrical devices 300 may also be powered by the battery pack 100, wherein the electrical devices may be other household appliances or personal electrical devices other than the above-mentioned power tool 200, for example Figure 1 The smart phone 300a, notebook 300b, mobile power supply 300c, soybean milk machine, grinder, etc.

[0043] refer to Figure 2 The battery pack 100 shown may include a shell assembly 11, a plurality of battery cells 12 accommodated in the shell assembly 11, and a first interface 13 and a second interface 14 formed on the shell assembly 11. The shell assembly 11 may include an upper shell 111 and a lower shell 112. There may be a variety of connection modes between the plurality of battery cells 12 accommodated in the shell assembly 11, such as series connection, parallel connection, or a combination of series and parallel connection. This embodiment does not limit the connection mode of the battery cells 12.

[0044] refer to Figure 2 and Figure 3, the first interface 13 can be connected to the first charging device 400 to charge the battery cell 12 in the battery pack 100. In this embodiment, the first interface 13 may include at least a positive connection terminal 131, a negative connection terminal 132, or may also include a communication terminal 133, and the positive connection terminal 131, the negative connection terminal 132 and the communication terminal 133 can be directly coupled with the charging terminal on the first charging device 400. In this embodiment, the first interface 13 can also be directly coupled with the power interface on the power tool 200 to power the power tool 200. In this embodiment, the first interface 13 may also include a power terminal 13a and a non-power terminal 13b, the so-called power terminal 13a may be the above-mentioned positive connection terminal 131 and negative connection terminal 132, the non-power terminal 13b may be a communication terminal 133, and may also include a temperature detection terminal T or an ID identification terminal B, etc.

[0045] The second interface 14 may be a Type-C interface, which can be connected to a second charging device 500 to charge the battery cells 12 in the battery pack 100. It can also be connected to an electrical device 300 having a Type-C interface to supply power thereto.

[0046] In one embodiment, the second charging device 500 may also be a charger for a mobile phone or a computer.

[0047] In one embodiment, the first interface 13 and the second interface 14 can work simultaneously. Exemplarily, the battery pack 100 can be charged through the first interface 13 and discharged through the second interface 14 at the same time; or the battery pack 100 can be discharged through the first interface 13 and charged through the second interface 14 at the same time; or the battery pack 100 can be charged through the first interface 13 and charged through the second interface 14 at the same time. In some embodiments, the battery pack 100 can also discharge through the first interface 13 and discharge through the second interface 14 at the same time. However, in fact, when discharging through two interfaces at the same time, the battery pack 100 has certain safety risks. For example, the charging systems of the two interfaces are independent of each other. When the two interfaces charge the battery cells at the same time, the maximum allowable charging current of the battery cells may be exceeded, affecting the safety of the battery cells.

[0048] In order to avoid the situation where two interfaces are charged at the same time, the present application controls at least the charging state of the first interface 13, for example, controls whether the first interface 13 can be charged according to the charging state of the second interface 14. In fact, the present application can control the first interface 13 to be unable to charge or control the first interface 13 to be in a non-chargeable state after the second interface 14 of the battery pack 100 is connected to the second charging device 500. It can be understood that the first interface 13 being in a non-chargeable state can be understood as the charging circuit in the battery pack 100 cannot obtain charging power through the first interface 13, or it can be understood as the first charging device 400 connected to the first interface 13 cannot charge the battery pack 100.

[0049] refer to Figure 3 , a charging control circuit 1000 is provided in the battery pack 100, and the charging control circuit 1000 can at least control the charging state of the first interface 13. In this embodiment, the charging control circuit 1000 may include at least a detection circuit 101, a terminal control circuit 102 and a control device 103. Among them, the detection circuit 101 can at least detect whether the second interface 14 is connected to the second charging device 500. The terminal control circuit 102 can at least change the terminal state of the non-power terminal 13b. The control device 103 is configured to control the terminal control circuit 102 to work so as to change the terminal state of the non-power terminal 13b. It should be noted that the change in the terminal state can be understood as a change in the connection object of the input end and / or output end of the power terminal 13a and / or the non-power terminal 13b in the charging control circuit 1000, or as a change in the electrical signal of the input end or output end of the power terminal 13a and / or the non-power terminal 13b.

[0050] In some implementations, the charging control circuit 1000 may include the terminal detection circuit 101 and the control device 103 in one circuit. Alternatively, one component may detect whether the second interface 14 is connected to the second charging device 500 and may also control the operation of the terminal control circuit 102, that is, one component may realize the functions of the detection circuit 101 and the control device 103.

[0051] In this embodiment, the detection circuit 101 can determine whether the second interface 14 is connected to the second charging device 500 according to the change of the electrical signal at the second interface 14, or determine whether the second interface 14 is connected to the second charging device 500 by identifying the communication data through the control chip.

[0052] In this embodiment, the control device 103 can determine whether to connect the second charging device 500 according to the electrical signal at the second interface 14 detected by the detection circuit 101. When the control device 103 determines that the second interface 14 is connected to the second charging device 500, the terminal control circuit 102 can be controlled to work so that the terminal connection state of at least one non-power terminal 13b changes, for example, a non-power terminal 13b can be changed from an original non-grounded state to a grounded state. Figure 4In the embodiment, the terminal control circuit 102 may include two thermistors 1021 and a controllable switch 1022 connected in parallel, one end of the thermistor 1021 and the controllable switch 1022 connected in parallel is connected to the non-power terminal T, and the other end is grounded. When the control device 103 determines that the second interface 14 is connected to the second charging device 500, the controllable switch 1022 is controlled to be closed, so that the thermistor 1021 is short-circuited to the ground and the non-power terminal T is grounded. After the thermistor terminal 1021 is short-circuited to the ground, the first charging device 400 connected to the first interface 13 can monitor the abnormal temperature at the non-power terminal T of the battery pack 100, so that over-temperature protection can be performed to stop charging the battery pack 100 or not charge the battery pack 100. That is, when the second charging device 500 is connected to the second interface 14, the charging control circuit 1000 can at least change the connection state of the non-power terminal 13b, so that the first charging device 400 connected to the first interface 13 can trigger one or more charging protection functions according to the connection state of the non-power terminal 13b, thereby preventing the battery pack 100 from being charged by the first charging device 400. The charging protection function triggered by the first charging device 400 according to the connection state of the non-power terminal 13b may include over-temperature protection, short circuit protection, reverse connection protection or low voltage protection, etc.

[0053] In this embodiment, the change in the interface state of the first interface 13 may cause the first charging device 400 to think that the battery pack 100 may be overheated, or part of the circuit is accidentally short-circuited, or the charging interface of the first charging device 400 is connected to the first interface 13 in reverse, or the voltage of the battery pack 100 is too low and does not match the first charging device 400. The above problems will cause the first charging device 400 to trigger charging protection and not charge the battery pack 100. In fact, the battery pack 100 in this application may not have the above problems, but by changing the interface state of the first interface 13 or at least changing the terminal connection state of the non-power terminal 13b, the first charging device 400 mistakenly believes that the battery pack 10 has the above problems and triggers charging protection. Thereby, it can be avoided that the battery pack 100 is charged through the first interface 13 while being charged using the second interface 14.

[0054] In some embodiments, when the second interface 14 is connected to the second charging device 500, the charging control circuit 100 can at least change the connection state of the non-power terminal 13b, so that the battery management module in the battery pack 100 can trigger the charging protection function of the battery pack 100, or at least trigger the charging protection function of charging through the first interface 13.

[0055] In other embodiments, the battery pack 100 can also trigger the discharge protection function of the power tool 200 connected to the first interface 13 by changing the interface state of the first interface 13, so that the battery pack 100 cannot discharge through the first interface 13 while being charged through the second interface 14.

[0056] refer to Figure 5 , a power control circuit 1100 is provided in the battery pack 100, and the power control circuit 1100 can at least control the charging power and / or discharging power of the second interface 14. In this embodiment, the power control circuit 1100 includes at least a power control module 1110, and the power control module 1110 is connected to the second interface 14, and the power control module 1110 is used to change the charging power and / or discharging power of the second interface 14 according to the temperature of the battery pack 100. Among them, the nominal voltage of the battery pack 100 is greater than 10V. For example, the nominal voltage of the battery pack 100 can be 12V, so that the nominal voltage of the first interface 13 can also be 12V.

[0057] like Figure 5 As shown, in some embodiments, the power control module 1110 includes an adjustment unit 1111, a management unit 1112, and a temperature detection unit 1113. Among them, one end of the adjustment unit 1111 is connected to the second interface 14, and the other end of the adjustment unit 1111 is connected to the multiple battery cells 12. The power control module 1110 is connected to the second interface 14 specifically, the adjustment unit 1111 in the power control module 1110 is connected to the second interface 14. One end of the management unit 1112 is connected to the adjustment unit 1111, and the other end of the management unit 1112 is connected to the temperature detection unit 1113. The temperature detection unit 1113 is used to detect the temperature of the battery pack 100, and transmit the detected temperature of the battery pack 100 to the management unit 1112. The management unit 1112 controls the adjustment unit 1111 based on the received temperature of the battery pack 100, and the adjustment unit 1111 changes the power of the second interface 14 based on the control of the management unit 1112. The power may be the charging power when the second interface 14 is in a charging state, or the discharging power when the second interface 14 is in a discharging state, which is not limited in the present application.

[0058] like Figure 6As shown, in some embodiments, the power control module 1110 includes an adjustment unit 1111 and a management module 1120. One end of the adjustment unit 1111 is connected to the second interface 14, and the other end of the adjustment unit 1111 is connected to the plurality of battery cells 12. The management module 1120 is connected to the adjustment unit 1111, and the management module 1120 includes a management unit 1112 and a temperature detection unit 1113. The temperature detection unit 1113 is used to detect the temperature of the battery pack 100. The management module 1120 controls the adjustment unit 1111 based on the temperature of the battery pack 100, specifically, the management unit 1112 in the management module 1120 controls the adjustment unit 1111 based on the temperature of the battery pack 100.

[0059] like Figure 7 As shown, in some embodiments, the temperature detection unit 1113 includes a first temperature detection unit 1113a and a second temperature detection unit 1113b, the first temperature detection unit 1113a is connected to the management unit 1112, and the second temperature detection unit 1113b is connected to the multiple battery cells 12. Among them, the first temperature detection unit 1113a is used to detect the temperature of the power control module 1110, and the second temperature detection unit 1113b is used to detect the temperature of the multiple battery cells 12. At this time, the temperature of the battery pack 100 detected by the temperature detection unit 1113 includes both the temperature of the power control module 1110 and the temperature of the battery cell 12. Optionally, the temperature detection unit 1113 may include only the first temperature detection unit 1113a, and the temperature of the battery pack 100 detected by the temperature detection unit 1113 only includes the temperature of the power control module 1110. Optionally, the temperature detection unit 1113 may include only the second temperature detection unit 1113b, and the temperature of the battery pack 100 detected by the temperature detection unit 1113 only includes the temperature of the battery cell 12. The second temperature detection unit 1113b may include but is not limited to a thermistor, which is not limited in this application.

[0060] Since the temperature of the battery pack 100 is determined by the current magnitude and time in the battery pack 100, for example, the larger the current value and the longer the current is maintained, the higher the temperature of the battery pack 100. Therefore, in some embodiments, the temperature detection unit 1113 can also be replaced by a current value and time detection unit, which has the same function and connection method as the temperature detection unit 1113, and will not be described in detail in this application.

[0061] like Figure 8As shown, in some embodiments, the adjustment unit 1111 may include a voltage control module 1111a and a current control module 1111b. When the temperature of the battery pack 100 detected by the temperature detection unit 1113 is greater than or equal to the preset threshold, the management unit 1112 controls the adjustment unit 1111 to change the charging power and / or discharging power of the second interface 14. Wherein, when the temperature detection unit 1113 includes both the first temperature detection unit 1113a and the second temperature detection unit 1113b, the preset threshold includes a first preset threshold and a second preset threshold, the first preset threshold is the temperature threshold of the power control module 1110, and the second preset threshold is the temperature threshold of the multiple battery cells 12. Since the multiple battery cells 12 are more sensitive to temperature than the power control module 1110 and are more affected at high temperatures, the first preset threshold is greater than the second preset threshold. Wherein, the first preset threshold may be 100°C, the second preset threshold may be 60°C, and the first preset threshold and the second preset threshold may also be any other values ​​set according to empirical values, which are not limited in this application. At this time, when the temperature detected by the first temperature detection unit 1113a is greater than or equal to the first preset threshold, or the temperature detected by the second temperature detection unit 1113b is greater than or equal to the second preset threshold, the management unit 1112 needs to control the adjustment unit 1111. Specifically, the voltage control module 1111a can reduce the voltage reaching the second interface 14 from the battery cell 12, and the current control module 1111b can reduce the current reaching the second interface 14 from the battery cell 12. Among them, the voltage control module 1111a can reduce the voltage reaching the second interface 14 from the battery cell 12 in a step-by-step manner according to a fixed voltage value, or it can be reduced without a fixed voltage value. Similarly, the current control module 1111b can reduce the current reaching the second interface 14 from the battery cell 12 in a step-by-step manner according to a fixed current value, or it can be reduced without a fixed current value. Thereby, the charging power and / or discharging power of the second interface 14 is reduced, so that the temperature of the battery pack 100 is reduced, and the battery pack 100 is prevented from being kept at a high temperature for a long time, which may cause hidden dangers to the safety of the battery pack 100 and the life of the battery pack 100 cannot be guaranteed. Among them, the voltage control module 1111a and the current control module 1111b can perform the reduction operation at the same time, so that the temperature of the battery pack 100 drops rapidly. Alternatively, only one of the two modules can perform the reduction operation, which is not limited in this application, and can be selected according to the temperature of the battery pack 100 exceeding the preset threshold.

[0062] The discharge voltage of the second interface 14 is greater than or equal to 5V and less than or equal to 20V, that is, the output voltage range of the second interface 14 is 5V to 20V. Therefore, when the second interface 14 is in the discharge state, the voltage control module 1111a reduces the voltage reaching the second interface 14 from the battery cell 12, so that the voltage reaching the second interface 14 cannot be lower than 5V.

[0063] In some embodiments, the regulating unit 1111 may only include a voltage control module 1111a; in some embodiments, the regulating unit 1111 may only include a current control module 1111b. The present application does not limit the specific control module included in the regulating unit 1111.

[0064] When the temperature of the battery pack 100 detected by the temperature detection unit 1113 is less than a preset threshold, and the power of the battery pack 100 is less than the maximum power, it means that the output power and / or input power of the second interface can be increased. Wherein, when the temperature detection unit 1113 includes both the first temperature detection unit 1113a and the second temperature detection unit 1113b, it is required that the temperature detected by the first temperature detection unit 1113a is less than the first preset threshold, and the temperature detected by the second temperature detection unit 1113b is less than the second preset threshold. Thus, the management unit 1112 controls the adjustment unit 1111 to increase the charging power and / or discharging power of the second interface 14, so that the charging speed and / or discharging speed of the battery pack 100 are accelerated and the charging and discharging performance of the battery pack 100 is improved while ensuring the safety and life of the battery pack 100. Optionally, when the adjustment unit 1111 includes a voltage control module 1111a and a current control module 1111b, the voltage control module 1111a can increase the voltage from the battery cell 12 to the second interface 14, and the current control module 1111b can increase the current from the battery cell 12 to the second interface 14. Among them, the voltage control module 1111a can increase the voltage from the battery cell 12 to the second interface 14 in a step-by-step manner according to a fixed voltage value, or it can be increased without a fixed voltage value. Similarly, the current control module 1111b can increase the current from the battery cell 12 to the second interface 14 in a step-by-step manner according to a fixed current value, or it can be increased without a fixed current value. Among them, the voltage control module 1111a and the current control module 1111b can perform the boosting operation at the same time, or only one of the two modules can perform the boosting operation. This is not limited in this application, and can be selected according to the power situation of the battery pack 100. In addition, since the output voltage range of the second interface 14 is 5V-20V, when the second interface 14 is in the discharge state, when the voltage control module 1111a increases the voltage from the battery cell 12 to the second interface 14, the voltage reaching the second interface 14 cannot be higher than 20V.

[0065] In addition, when the temperature of the battery pack 100 detected by the temperature detection unit 1113 is lower than a preset threshold, but the power of the battery pack 100 has reached the maximum power, no operation is performed on the battery pack 100 at this time.

[0066] Fig. 9 A control method for a battery pack is proposed. The control method for the battery pack includes the following steps:

[0067] Step 900 : The battery pack 100 is charged / discharged via the second interface 14 .

[0068] The battery pack 100 is in a state of being charged / discharged through the second interface 14 .

[0069] Step 910 , detecting the temperature of the battery pack 100 .

[0070] When it is determined in step 900 that the battery pack 100 is being charged / discharged through the second interface 14 , the temperature of the battery pack 100 is detected by the temperature detection unit 1113 described above in the present application.

[0071] Step 920 , determining whether the temperature of the battery pack 100 reaches a preset threshold.

[0072] After detecting the temperature of the battery pack 100 in step 910, when the temperature of the battery pack 100 is greater than or equal to the preset threshold (i.e., reaches the preset threshold), jump to step 930A; when the temperature of the battery pack 100 is less than the preset threshold (i.e., does not reach the preset threshold), jump to step 930B.

[0073] Step 930A, reducing the charging / discharging power of the second interface 14 .

[0074] After determining that the temperature of the battery pack 100 is greater than or equal to the preset threshold, the management unit 1112 of the present application controls the adjustment unit 1111 to reduce the charging power and / or discharging power of the second interface 14. This reduces the temperature of the battery pack 100, reduces the probability of potential safety hazards of the battery pack 100, and improves the safety and service life of the battery pack 100.

[0075] Step 930B, determining whether the power of the battery pack 100 reaches the maximum power.

[0076] After determining that the temperature of the battery pack 100 is less than the preset threshold, when the power of the battery pack 100 reaches the maximum power, although the temperature of the battery pack 100 is less than the preset threshold, no operation is performed on the battery pack 100. When the power of the battery pack 100 does not reach the maximum power, and the temperature of the battery pack 100 is less than the preset threshold, jump to step 940.

[0077] Step 940 , increasing the charging / discharging power of the second interface 14 .

[0078] In step 930B, it is determined that the temperature of the battery pack 100 is less than the preset threshold and the power of the battery pack 100 has not reached the maximum power. Then, the management unit 1112 mentioned in the present application controls the adjustment unit 1111 to increase the charging power and / or discharging power of the second interface 14, that is, to speed up the charging / discharging speed of the battery pack 100.

[0079] In some embodiments, since the temperature of the battery pack 100 rises more during discharge than during charge, the rated charging power of the battery pack 100 may be set to be greater than the rated discharging power when the battery pack 100 leaves the factory.

[0080] In some embodiments, the battery pack 100 further includes an indicator light, which is used to indicate the charging power and discharging power of the battery pack 100. Optionally, when the charging and / or discharging power of the battery pack 100 is greater than or equal to a preset power threshold, the indicator light flashes at a faster frequency; when the charging and / or discharging power of the battery pack 100 is less than the preset power threshold, the indicator light flashes at a slower frequency. Optionally, the indicator light may include only one light, which is always on when the charging and / or discharging power of the battery pack 100 is greater than or equal to the preset power threshold; when the charging and / or discharging power of the battery pack 100 is less than the preset power threshold, the indicator light is off. Optionally, the indicator light may include two lights, namely a first indicator light and a second indicator light, which are always on when the charging and / or discharging power of the battery pack 100 is greater than or equal to the preset power threshold; when the charging and / or discharging power of the battery pack 100 is less than the preset power threshold, the second indicator light is always on. Optionally, the indicator light may include 4 lights, which are arranged in the same row. When the charging and / or discharging power of the battery pack 100 is greater than or equal to a preset power threshold, the last indicator light is always on; when the charging and / or discharging power of the battery pack 100 is less than the preset power threshold, the 4 indicator lights are lit one by one in sequence. In addition, the indicator light may also be any other form that can distinguish whether the charging and / or discharging power is greater than the preset power threshold, which is not limited in this application. Among them, the preset power threshold is determined based on an empirical value.

[0081] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the above embodiments do not limit the present application in any form, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the present application.

Claims

1. A battery pack configured to power an electric tool, comprising: Shell assembly; A plurality of battery cells are disposed in the housing assembly; A first interface is configured to be detachably connected to a first charging device and configured to be able to power the electric tool; A second interface is configured to be detachably connected to a second charging device; A power control module, configured to be connected to the second interface; The power control module is used to change the charging power and / or discharging power of the second interface according to the temperature of the battery pack.

2. The battery pack configured to power an electric tool as claimed in claim 1, characterized in that: The second interface is a Type-C interface.

3. The battery pack configured to power an electric tool as claimed in claim 1, characterized in that: The power control module includes a temperature detection unit, and the temperature detection unit is used to detect the temperature of the battery pack.

4. The battery pack configured to power an electric tool as claimed in claim 3, characterized in that: The temperature detection unit includes a first temperature detection unit and a second temperature detection unit. The first temperature detection unit is used to detect the temperature of a power control module in the battery pack, and the second temperature detection unit is used to detect the temperature of multiple battery cells in the battery pack.

5. The battery pack configured to power an electric tool as claimed in claim 3, characterized in that: The power control module also includes a management unit and a regulating unit, the regulating unit is also connected to the multiple battery cells, the management unit is connected to the regulating unit and the temperature detection unit, and the management unit controls the regulating unit based on the temperature detected by the temperature detection unit and a preset threshold.

6. The battery pack configured to power an electric tool as claimed in claim 5, characterized in that: The regulating unit includes a voltage control module, and the voltage control module is used to reduce the voltage reaching the second interface when the temperature of the battery pack is greater than or equal to the preset threshold.

7. The battery pack configured to power an electric tool as claimed in claim 5, characterized in that: The regulating unit includes a current control module, and the current control module is used to reduce the current reaching the second interface when the temperature of the battery pack is greater than or equal to the preset threshold.

8. The battery pack configured to power an electric tool as claimed in claim 5, characterized in that: The regulating unit includes a voltage control module and a current control module. When the temperature of the battery pack is greater than or equal to the preset threshold, the voltage control module reduces the voltage reaching the second interface, and the current control module reduces the current reaching the second interface.

9. The battery pack configured to power an electric tool as claimed in claim 5, characterized in that: When the temperature of the battery pack is lower than the preset threshold and the power of the battery pack is lower than the maximum power, the management unit controls the adjustment unit to increase the output power and / or input power of the second interface.

10. A battery pack configured to power an electric tool as claimed in any one of claims 5 to 9, characterized in that: The preset threshold includes a first preset threshold and a second preset threshold, the first preset threshold is the temperature threshold of the power control module in the battery pack, and the second preset threshold is the temperature threshold of multiple battery cells in the battery pack; wherein the first preset threshold is greater than the second preset threshold.

11. The battery pack configured to power an electric tool as claimed in claim 1, characterized in that: The nominal voltage of the first interface is greater than 10V, and the discharge voltage of the second interface is greater than or equal to 5V and less than or equal to 20V.

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