Battery pack

Abstract

The invention discloses a battery pack which at least comprises a first interface which is arranged to be detachably connected with first charging equipment; the second interface is arranged to be detachably connected with second charging equipment; the first interface comprises a power supply terminal and a plurality of non-power terminals; and when the second interface is connected to the second charging equipment, the terminal state of at least one non-power terminal is changed, so that the first interface can be in a non-charging state.

Description

Technical Field

[0001] The present application relates to an energy storage device, and in particular to a battery pack. 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] However, power tool battery packs with traditional charging / discharging terminals and Type-C interfaces have certain safety risks when being charged through both traditional charging terminals and Type-C interfaces at the same time.

[0004] This section provides background information related to the present application which is not necessarily prior art. Summary of the invention

[0005] 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 that can avoid charging with both a traditional terminal and a Type-C interface at the same time.

[0006] In order to achieve the above objectives, this application adopts the following technical solutions: A battery pack comprises at least a first interface, which is configured to be detachably connected to a first charging device; and a second interface, which is configured to be detachably connected to a second charging device; the first interface comprises a power terminal and a plurality of non-power terminals; wherein, when the second interface is connected to the second charging device, the terminal state of at least one of the non-power terminals changes, thereby making the first interface in a non-chargeable state.

[0007] The second interface is a Type-C interface, and this feature can be combined with one or more of the above features.

[0008] The battery pack further includes a charging control circuit configured to control a terminal connection state of at least one of the non-power terminals, and this feature may be combined with one or more of the above features.

[0009] The charging control circuit includes: a detection circuit, which can at least detect whether the second interface is connected to the second charging device. This feature can be combined with one or more of the above features. The charging control circuit includes: a terminal control circuit electrically connected to at least one of the non-power terminals; when the detection circuit detects that the second interface is connected to the second charging device, the terminal control circuit is configured to control at least one of the non-power terminals to be grounded. This feature can be combined with one or more of the above features.

[0010] The detection circuit includes a control device; the control device is connected between the second interface and the terminal control circuit, and controls the first terminal control circuit to work so that at least one of the non-power terminals is grounded when the second interface is connected to the second charging device. This feature can be combined with one or more of the above features.

[0011] The terminal control circuit includes a thermistor and a controllable switch connected in parallel; the control device is configured to control the controllable switch to be turned on when the second interface is connected to the second charging device. This feature can be combined with one or more of the above features.

[0012] The non-power terminals include communication terminals and / or temperature acquisition terminals. This feature can be combined with one or more of the above features.

[0013] A battery pack comprises at least a first interface configured to be detachably connected to a first charging device; a second interface configured to be detachably connected to a second charging device; when the second interface is connected to the second charging device, the first interface is in a non-chargeable state.

[0014] The second interface is a Type-C interface, and this feature can be combined with one or more of the above features.

[0015] The battery pack further includes a charging control circuit configured to control a terminal connection state of at least one of the non-power terminals, and this feature may be combined with one or more of the above features.

[0016] The charging control circuit includes: a detection circuit, which can at least detect whether the second interface is connected to the second charging device. This feature can be combined with one or more of the above features. The charging control circuit includes: a terminal control circuit electrically connected to at least one of the non-power terminals; when the detection circuit detects that the second interface is connected to the second charging device, the terminal control circuit is configured to control at least one of the non-power terminals to be grounded. This feature can be combined with one or more of the above features.

[0017] The detection circuit includes a control device; the control device is connected between the second interface and the terminal control circuit, and controls the first terminal control circuit to work so that at least one of the non-power terminals is grounded when the second interface is connected to the second charging device. This feature can be combined with one or more of the above features.

[0018] The terminal control circuit includes a thermistor and a controllable switch connected in parallel; the control device is configured to control the controllable switch to be turned on when the second interface is connected to the second charging device. This feature can be combined with one or more of the above features.

[0019] The non-power terminals include communication terminals and / or temperature acquisition terminals. This feature can be combined with one or more of the above features.

[0020] A battery pack comprises at least a first interface, which is configured to be detachably connected to a first charging device; and a second interface, which is configured to be detachably connected to a second charging device; after the second interface is connected to the second charging device and the interface state of the first interface changes, the first charging device connected to the first interface can trigger at least one charging protection function.

[0021] The second interface is a Type-C interface, and this feature can be combined with one or more of the above features.

[0022] The battery pack further includes a charging control circuit configured to control a terminal connection state of at least one of the non-power terminals, and this feature may be combined with one or more of the above features.

[0023] The charging control circuit includes: a detection circuit, which can at least detect whether the second interface is connected to the second charging device. This feature can be combined with one or more of the above features. The charging control circuit includes: a terminal control circuit electrically connected to at least one of the non-power terminals; when the detection circuit detects that the second interface is connected to the second charging device, the terminal control circuit is configured to control at least one of the non-power terminals to be grounded. This feature can be combined with one or more of the above features.

[0024] The detection circuit includes a control device; the control device is connected between the second interface and the terminal control circuit, and controls the first terminal control circuit to work so that at least one of the non-power terminals is grounded when the second interface is connected to the second charging device. This feature can be combined with one or more of the above features.

[0025] The terminal control circuit includes a thermistor and a controllable switch connected in parallel; the control device is configured to control the controllable switch to be turned on when the second interface is connected to the second charging device. This feature can be combined with one or more of the above features.

[0026] The non-power terminals include communication terminals and / or temperature acquisition terminals. This feature can be combined with one or more of the above features.

[0027] An electrical system includes a first charging device; a second charging device; a battery pack, including a first interface, which is configured to be detachably connected to the first charging device; and a second interface, which is configured to be detachably connected to the second charging device; wherein, when the second interface is connected to the second charging device, the interface state of the first interface changes, which can cause the first charging device connected to the first interface to trigger at least one charging protection function.

[0028] The second interface is a Type-C interface, and this feature can be combined with one or more of the above features.

[0029] The battery pack further includes a charging control circuit configured to control a terminal connection state of at least one of the non-power terminals, and this feature may be combined with one or more of the above features.

[0030] The charging control circuit includes: a detection circuit, which can at least detect whether the second interface is connected to the second charging device. This feature can be combined with one or more of the above features. The charging control circuit includes: a terminal control circuit electrically connected to at least one of the non-power terminals; when the detection circuit detects that the second interface is connected to the second charging device, the terminal control circuit is configured to control at least one of the non-power terminals to be grounded. This feature can be combined with one or more of the above features.

[0031] The detection circuit includes a control device; the control device is connected between the second interface and the terminal control circuit, and controls the first terminal control circuit to work so that at least one of the non-power terminals is grounded when the second interface is connected to the second charging device. This feature can be combined with one or more of the above features.

[0032] The terminal control circuit includes a thermistor and a controllable switch connected in parallel; the control device is configured to control the controllable switch to be turned on when the second interface is connected to the second charging device. This feature can be combined with one or more of the above features.

[0033] The non-power terminals include communication terminals and / or temperature acquisition terminals. This feature can be combined with one or more of the above features.

[0034] A battery pack comprises: a shell assembly; a plurality of battery cells arranged in the shell assembly; a first interface configured to be detachably connected to a first charging device; a second interface configured to be detachably connected to a second charging device; the first interface comprises a power terminal and a plurality of non-power terminals; wherein, when the second interface is connected to the second charging device, the terminal state of the power terminal and / or the non-power terminal changes, so that the first interface can be placed in a non-chargeable state.

[0035] A battery pack comprises: a shell assembly; a plurality of battery cells arranged in the shell assembly; a first interface configured to be detachably connected to a first charging device; a second interface configured to be detachably connected to a second charging device; the first interface comprises a power terminal and a plurality of non-power terminals; wherein, when the second interface is connected to the second charging device, the terminal state of the power terminal changes, thereby making the first interface in a non-chargeable state. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 is a schematic diagram of a battery pack power supply system according to an embodiment; Figure 2 is a schematic diagram of a battery pack charging system according to an embodiment; Figure 3 is a schematic diagram of a charging control circuit in a battery pack according to an embodiment; Figure 4 The present invention is a schematic diagram of a charging control circuit in a battery pack according to an embodiment of the present invention. DETAILED DESCRIPTION

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] In this 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, etc. 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).

[0042] 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.

[0043] 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.

[0044] 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.

[0045] In the present application, the terms “device”, “module” or “unit” may be implemented in the form of hardware or software to achieve specific functions.

[0046] 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.).

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] In one embodiment, the second charging device 500 may also be a charger for a mobile phone or a computer.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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, comprising: Shell assembly; A plurality of battery cells are disposed in the housing assembly; A first interface, configured to be detachably connected to a first charging device; A second interface is configured to be detachably connected to a second charging device; The first interface includes a power terminal and a plurality of non-power terminals; When the second interface is connected to the second charging device, the terminal state of at least one of the non-power terminals changes, which can make the first interface in a non-charging state.

2. The battery pack according to claim 1, characterized in that: The second interface is a Type-C interface.

3. The battery pack according to claim 1, characterized in that: The battery pack further includes a charging control circuit configured to control a terminal connection state of at least one of the non-power terminals.

4. The battery pack according to claim 3, characterized in that: The charging control circuit includes at least: a detection circuit, which can at least detect whether the second interface is connected to the second charging device; a terminal control circuit, which is electrically connected to at least one of the non-power terminals; when the detection circuit detects that the second interface is connected to the second charging device, the terminal control circuit is configured to control at least one of the non-power terminals to be grounded.

5. The battery pack according to claim 4, characterized in that: The charging control circuit also includes a control device; the control device is connected between the second interface and the terminal control circuit, and controls the terminal control circuit to operate so that at least one of the non-power terminals is grounded when the second interface is connected to the second charging device.

6. The battery pack according to claim 5, characterized in that: The terminal control circuit includes a thermistor and a controllable switch connected in parallel; the control device is configured to control the controllable switch to be turned on when the second interface is connected to the second charging device.

7. The battery pack according to claim 1, characterized in that: The non-power terminals include communication terminals and / or temperature collection terminals.

8. A battery pack comprising: Shell assembly; A plurality of battery cells are disposed in the housing assembly; A first interface, configured to be detachably connected to a first charging device; A second interface is configured to be detachably connected to a second charging device; The first interface includes a power terminal and a plurality of non-power terminals; When the second interface is connected to the second charging device, the terminal state of the power terminal and / or the non-power terminal changes, which can make the first interface in a non-charging state.

9. The battery pack according to claim 8, characterized in that: The second interface is a Type-C interface.

10. A battery pack, comprising at least: A first interface, configured to be detachably connected to a first charging device; A second interface is configured to be detachably connected to a second charging device; Wherein, when the second interface is connected to the second charging device, the change in the interface state of the first interface can cause the first charging device connected to the first interface to trigger at least one charging protection function.

11. The battery pack according to claim 10, characterized in that: The first interface includes a power terminal and a plurality of non-power terminals; after the second interface is connected to the second charging device, a terminal connection state of at least one of the non-power terminals changes.

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