Battery pack and electric tool

Abstract

The embodiment of the utility model relates to the technical field of batteries, and provides a battery pack and an electric tool, and the battery pack comprises a lower housing which is provided with an accommodation space; the first battery cell group is fixed in the accommodating space; the second battery cell group is fixed in the accommodating space; the first upper cover assembly is detachably connected with the lower shell, and the first upper cover assembly is used for connecting the first battery cell group and the second battery cell group in series and outputting a first electric signal when the first upper cover assembly is connected with the lower shell; and the second upper cover assembly is detachably connected with the lower shell, and the second upper cover assembly is used for connecting the first battery cell group and the second battery cell group in parallel and outputting a second electric signal when the second upper cover assembly is connected with the lower shell. And different electric signals can be flexibly output.

Description

Technical Field

[0001] Embodiments of the present disclosure relate to the field of batteries, and in particular to a battery pack and a power tool. Background Art

[0002] As an electrical load including a motor, power tools are widely used in household and industrial applications. With the continuous development of battery manufacturing technology, more and more power tools use batteries as power sources, forming cordless battery-powered power tools.

[0003] Different types of battery-powered power tools usually have different voltage and current requirements. If each type of battery-powered power tool is equipped with a battery of a single voltage level to provide voltage and current for the power tool, the battery lacks availability and convenience for power tools produced by the same manufacturer. Summary of the Utility Model

[0004] Embodiments of the present disclosure provide a battery pack and a power tool that can at least output different electrical signals.

[0005] According to some embodiments of the present disclosure, on the one hand, a battery pack is provided, including: a lower housing having an accommodation space; a first battery cell group fixed in the accommodation space; a second battery cell group fixed in the accommodation space; a first upper cover assembly detachably connected to the lower housing, and during the connection between the first upper cover assembly and the lower housing, the first upper cover assembly is configured to connect the first battery cell group and the second battery cell group in series and output a first electrical signal; a second upper cover assembly detachably connected to the lower housing, and during the connection between the second upper cover assembly and the lower housing, the second upper cover assembly is configured to connect the first battery cell group and the second battery cell group in parallel and output a second electrical signal.

[0006] In some embodiments, the first upper cover assembly includes: a first protective housing detachably connected to the lower housing; a first circuit board embedded in the first protective housing, and the first circuit board connects the first battery cell group and the second battery cell group in series and outputs the first electrical signal.

[0007] In some embodiments, the first battery cell group includes a first positive output terminal and a first negative output terminal, the second battery cell group includes a second positive output terminal and a second negative output terminal, and the first circuit board includes: a first connection terminal electrically connected to the first positive output terminal; a second connection terminal electrically connected to the first negative output terminal; a third connection terminal electrically connected to the second positive output terminal; a fourth connection terminal electrically connected to the second negative output terminal; a third positive output terminal electrically connected to one of the first connection terminal and the third connection terminal; a third negative output terminal electrically connected to one of the second connection terminal and the fourth connection terminal; a first connection wire, one end of the first connection wire is electrically connected to the other of the first connection terminal and the third connection terminal, and the other end is electrically connected to the other of the second connection terminal and the fourth connection terminal.

[0008] In some embodiments, the first circuit board further includes: a first serial communication port located between the third positive output terminal and the third negative output terminal.

[0009] In some embodiments, the second upper cover assembly includes: a second protective housing detachably connected to the lower housing; a second circuit board embedded in the second protective housing, the second circuit board being connected in parallel with the first battery cell group and the second battery cell group and outputting the second electrical signal.

[0010] In some embodiments, the first battery cell group includes a first positive output terminal and a first negative output terminal, the second battery cell group includes a second positive output terminal and a second negative output terminal, and the second circuit board includes: a fifth connection terminal electrically connected to the first positive output terminal; a sixth connection terminal electrically connected to the first negative output terminal; a seventh connection terminal electrically connected to the second positive output terminal; an eighth connection terminal electrically connected to the second negative output terminal; a fourth positive output terminal electrically connected to one of the fifth connection terminal and the seventh connection terminal; a fourth negative output terminal electrically connected to one of the sixth connection terminal and the eighth connection terminal; a second connection wire, one end of the second connection wire is electrically connected to the fifth connection terminal, and the other end is electrically connected to the seventh connection terminal; a third connection wire, one end of the third connection wire is electrically connected to the sixth connection terminal, and the other end is electrically connected to the eighth connection terminal.

[0011] In some embodiments, the second circuit board further includes: a second serial communication port, and the second serial communication port is located between the fourth positive output terminal and the fourth negative output terminal.

[0012] In some embodiments, the first upper cover assembly is provided with a first fool-proof structure, and the second upper cover assembly is provided with a second fool-proof structure, and the first fool-proof structure is different from the second fool-proof structure.

[0013] In some embodiments, the battery pack further includes: a third circuit board, which is fixed in the lower shell, electrically connected to the first battery cell group and the second battery cell group, and leads to output ends of the first battery cell group and the second battery cell group.

[0014] According to some embodiments of the present disclosure, another aspect of the present disclosure further provides an electric tool, comprising the battery pack as described above.

[0015] The technical solution provided by the embodiment of the present disclosure has at least the following advantages: the first battery cell group and the second battery cell group are used to provide power signals. When high voltage output is required, the first upper cover assembly and the lower shell are assembled together, thereby connecting the first battery cell group and the second battery cell group in series to output a higher voltage. When low voltage output is required, the second upper cover assembly and the lower shell are assembled together, thereby connecting the first battery cell group and the second battery cell group in parallel. In this way, a battery pack can take into account both the output of the first electrical signal and the output of the second electrical signal. Different power usage strategies can be selected according to actual power usage conditions, thereby improving the convenience of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings, and these exemplified descriptions do not constitute a limitation on the embodiments. Unless otherwise specified, the pictures in the drawings do not constitute a scale limitation. In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the traditional technology, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A schematic diagram of the structure of a battery pack provided by the present disclosure;

[0018] Figure 2 A schematic structural diagram of a first upper cover assembly provided in one embodiment of the present disclosure;

[0019] Figure 3 A schematic diagram of the structure of a first circuit board provided in one embodiment of the present disclosure;

[0020] Figure 4 A circuit diagram of a first battery cell group and a second battery cell group connected in series provided in one embodiment of the present disclosure;

[0021] Figure 5 A schematic diagram of the structures corresponding to a first circuit board and a third circuit board provided in one embodiment of the present disclosure;

[0022] Figure 6 A schematic diagram of the structure of a second upper cover assembly 104 provided in one embodiment of the present disclosure;

[0023] Figure 7 A schematic diagram of the structure of a second circuit board provided in one embodiment of the present disclosure;

[0024] Figure 8 A circuit diagram of a first battery cell group and a second battery cell group connected in parallel provided in an embodiment of the present disclosure;

[0025] Figure 9 A schematic diagram of the structures corresponding to a second circuit board and a third circuit board provided in one embodiment of the present disclosure;

[0026] Figure 10 A schematic structural diagram of a snap-fit ​​structure provided in one embodiment of the present disclosure. DETAILED DESCRIPTION

[0027] As known from the background technology, the current battery pack can usually only output one electrical signal. When it is necessary to output a second electrical signal, the battery pack needs to be replaced, which is very troublesome.

[0028] The disclosed embodiment provides a battery pack, which provides a power signal through a first battery cell group and a second battery cell group. When a high voltage output is required, the first upper cover assembly and the lower shell are assembled together, thereby connecting the first battery cell group and the second battery cell group in series to output a higher voltage. When a low voltage output is required, the second upper cover assembly and the lower shell are assembled together, thereby connecting the first battery cell group and the second battery cell group in parallel. In this way, a battery pack can take into account both the output of the first electrical signal and the output of the second electrical signal. Different power usage strategies can be selected according to actual power usage conditions, thereby improving the convenience of the battery pack.

[0029] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0030] Reference to "embodiments" in this specification means that the particular features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment each time, nor are they independent or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0031] In the description of the embodiments of the present application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B, which can represent: the existence of A, the simultaneous existence of A and B, and the existence of B. In addition, the character " / " in this text generally represents an "or" relationship between the associated objects before and after.

[0032] In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0033] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the embodiments of the present application.

[0034] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "install", "connect", "couple", "fix", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0035] In the accompanying drawings corresponding to the embodiments of the present application, for better understanding and description, the thickness and area of the layers are enlarged. When describing a component (such as a layer, film, region, or substrate) on or on the surface of another component, the component can be "directly" on the surface of the other component, or there can be a third component between the two components. Conversely, when describing a component on the surface of another component or when another component is formed or provided on the surface of a component, it means that there is no third component between the two components. In addition, when describing a component "substantially" formed on another component, it means that the component is not formed on the entire surface (or front surface) of the other component, nor on a partial edge of the entire surface.

[0036] In the description of the embodiments of the present application, when a certain component "includes" another component, unless otherwise specified, other components are not excluded, and other components may further be included. In addition, when components such as layers, films, regions, or plates are referred to as "on / at" another component, it can be "directly on" the other component (that is, on the surface of the other component and there is no other component between the two), or there can be another component between them. In addition, when components such as layers, films, regions, plates, etc. are "directly located on" another component, or when components such as layers, films, regions, plates, etc. are located on the surface of another component, it means that there is no other component located between them.

[0037] The terms used in the description of the various embodiments herein are only for describing specific embodiments and are not intended to be limiting. As used in the description of the various embodiments and the appended claims, "the component" is also intended to include the plural form, unless the context clearly indicates otherwise. Among them, the component includes components such as layers, films, regions, or plates.

[0038] The embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. However, those of ordinary skill in the art can understand that in the embodiments of the present disclosure, many technical details are presented for the reader to better understand the embodiments of the present disclosure. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solutions required to be protected by the embodiments of the present disclosure can be implemented.

[0039] Reference Figure 1 , Figure 1 is a schematic structural diagram of a battery pack provided by the present disclosure.

[0040] In some embodiments, the battery pack may include: a lower housing 100, and the lower housing 100 has an accommodation space.

[0041] The battery pack may further include: a first battery cell group 101, and the first battery cell group 101 is fixed in the accommodation space.

[0042] The battery pack may further include: a second battery cell group 102, which is fixed in the accommodation space.

[0043] The battery pack may further include: a first upper cover assembly 103, which is detachably connected to the lower housing 100, and during the connection between the first upper cover assembly 103 and the lower housing 100, the first upper cover assembly 103 is used to connect the first battery cell group 101 and the second battery cell group 102 in series and output a first electrical signal.

[0044] The battery pack may further include: a second upper cover assembly 104, which is detachably connected to the lower housing 100, and during the connection between the second upper cover assembly 104 and the lower housing 100, the second upper cover assembly 104 is used to connect the first battery cell group 101 and the second battery cell group 102 in parallel and output a second electrical signal.

[0045] An embodiment of the present disclosure provides a battery pack. The power signal is provided by the first battery cell group 101 and the second battery cell group 102. When a high voltage output is required, the first upper cover assembly 103 is assembled with the lower housing 100, so that the first battery cell group 101 and the second battery cell group 102 are connected in series to output a higher voltage. When a low voltage output is required, the second upper cover assembly 104 is assembled with the lower housing 100, so that the first battery cell group 101 and the second battery cell group 102 are connected in parallel. In this way, it is realized that a battery pack can take into account both the output of the first electrical signal and the output of the second electrical signal, and different power consumption strategies can be selected according to the actual power consumption situation, improving the convenience of the battery pack.

[0046] In some embodiments, the lower housing 100 is the housing for installing and protecting the first battery cell group 101 and the second battery cell group 102. Different fixing structures can be provided on the lower housing 100, so as to facilitate the installation between the lower housing and the first upper cover assembly 103 and the second upper cover assembly 104.

[0047] In some embodiments, the first battery cell group 101 may be composed of multiple battery cells, the battery cells are connected in series with each other, and the number of battery cells can be flexibly selected according to the electrical signal required to be output by the battery pack.

[0048] In some embodiments, the battery cells in the first battery cell group 101 may have the same voltage and the same capacity.

[0049] In some embodiments, the second battery cell group 102 may be composed of multiple battery cells, the battery cells are connected in series with each other, and the number of battery cells can be flexibly selected according to the electrical signal required to be output by the battery pack.

[0050] In some embodiments, the battery cells in the second battery cell group 102 may have the same voltage and the same capacity.

[0051] In some embodiments, the number of battery cells in the second battery cell group 102 may be the same as the number of battery cells in the first battery cell group 101, and / or, the voltage of the battery cells in the second battery cell group 102 may be the same as the voltage of the battery cells in the first battery cell group 101, and / or, the capacity of the battery cells in the second battery cell group 102 may be the same as the capacity of the battery cells in the first battery cell group 101.

[0052] Reference Figure 2 , Figure 2 FIG.

[0053] In some embodiments, the first upper cover assembly 103 may include: a first protective housing 113, the first protective housing 113 being detachably connected to the lower housing 100; a first circuit board 123, the first circuit board 123 being embedded in the first protective housing 113, the first circuit board 123 connecting the first battery cell group 101 and the second battery cell group 102 in series and outputting a first electrical signal. The first circuit board 123 is the structure that realizes the series connection of the first battery cell group 101 and the second battery cell group 102. By embedding the first circuit board 123 in the first protective housing 113, the first circuit board 123 can be directly disassembled synchronously when the first upper cover assembly 103 is disassembled, thereby facilitating the replacement between the first upper cover assembly 103 and the second upper cover assembly 104 and improving the convenience of replacing the output signal.

[0054] In some embodiments, the first protective housing 113 can protect the first circuit board 123, and the first circuit board 123 can be fastened to the first protective housing 113 by screws, thereby improving the tightness of the connection between the first circuit board 123 and the first protective housing 113.

[0055] Output ports can be provided on the first protective housing 113, so as to facilitate leading out the electrical signal of the first circuit board 123 and also facilitate the connection between the battery pack and the electrical device.

[0056] With reference to Figures 3 to 5 , wherein, Figure 3 FIG. Figure 4 FIG. Figure 5 FIG. Figure 4 shows only one circuit diagram of the series connection of the first battery cell group and the second battery cell group, and other situations can be modified adaptively according to the text.

[0057] In some embodiments, the first battery cell group 101 includes a first positive output terminal 111 and a first negative output terminal 121, the second battery cell group 102 includes a second positive output terminal 112 and a second negative output terminal 122, and the first circuit board 123 includes: a first connection terminal 133, the first connection terminal 133 being electrically connected to the first positive output terminal 111; a second connection terminal 143, the second connection terminal 143 being electrically connected to the first negative output terminal 121; a third connection terminal 153, the third connection terminal 153 being electrically connected to the second positive output terminal 112; a fourth connection terminal 163, the fourth connection terminal 163 being electrically connected to the second negative output terminal 122; a third positive output terminal 173, the third positive output terminal 173 being electrically connected to one of the first connection terminal 133 and the third connection terminal 153; a third negative output terminal 183, the third negative output terminal 183 being electrically connected to one of the second connection terminal 143 and the fourth connection terminal 163; a first connection wire 193, one end of the first connection wire 193 being electrically connected to the other of the first connection terminal 133 and the third connection terminal 153, and the other end being electrically connected to the other of the second connection terminal 143 and the fourth connection terminal 163.

[0058] The first connection terminal 133, the second connection terminal 143, the third connection terminal 153, and the fourth connection terminal 163 are used to lead out the output ports of the first battery cell group 101 and the second battery cell group 102, so as to facilitate the setting of the first connection wire 193 on the first circuit board 123. The third positive output terminal 173 and the third negative output terminal 183 serve as the positive output port and the negative output port of the first circuit board 123, respectively.

[0059] For the series connection of the first battery cell group 101 and the second battery cell group 102, it is only necessary to electrically connect the positive electrode of the first battery cell group 101 to the negative electrode of the second battery cell group 102, or to electrically connect the negative electrode of the first battery cell group 101 to the positive electrode of the second battery cell group 102. Therefore, for the third positive output terminal 173 and the third negative output terminal 183, it is only necessary to respectively connect the ports not connected to the first connection wire 193 to the third positive output terminal 173 and the third negative output terminal 183 to output the electrical signals of the series connection of the first battery cell group 101 and the second battery cell group 102.

[0060] Taking the first battery cell group 101 and the second battery cell group 102 as examples that can respectively provide electrical signals of 20V and 1Ah, the electrical signals output through the first upper cover assembly 103 are electrical signals of 40V and 1Ah, thus providing a higher voltage.

[0061] It should be noted that the above description of the electrical connection between the first connection terminal 133 and the first positive output terminal 111 is only for illustration, and does not limit that the first connection terminal 133 can only be electrically connected to the first positive output terminal 111. The first connection terminal can also be electrically connected to the first negative output terminal, and only corresponding adjustments need to be made to other connection points.

[0062] In some embodiments, the battery pack further includes: a third circuit board 105, which is fixed in the lower housing 100 and electrically connected to the first battery cell group 101 and the second battery cell group 102, and leads out the output terminals of the first battery cell group 101 and the second battery cell group 102. By providing the third circuit board 105, it is more convenient to electrically connect to the first upper cover assembly 103 or the second upper cover assembly 104, and it is also easier to replace the first upper cover assembly 103 or the second upper cover assembly 104, thereby facilitating the switching between different electrical signals.

[0063] The third circuit board 105 can be arranged in the direction of the first battery cell group 101 and the second battery cell group 102 facing the first upper cover assembly 103 or the second upper cover assembly 104, so as to facilitate the electrical connection between the third circuit board 105 and the first upper cover assembly 103 or the second upper cover assembly 104.

[0064] Specifically, the third circuit board 105 can include a ninth connection terminal 115, a tenth connection terminal 125, an eleventh connection terminal 135, and a twelfth connection terminal 145. The ninth connection terminal 115, the tenth connection terminal 125, the eleventh connection terminal 135, and the twelfth connection terminal 145 are respectively in contact connection with the first positive output terminal 111, the first negative output terminal 121, the second positive output terminal 112, and the second negative output terminal 122 in a one-to-one correspondence.

[0065] The ninth connection terminal 115, the tenth connection terminal 125, the eleventh connection terminal 135, and the twelfth connection terminal 145 can extend from the third circuit board 105 in a direction away from the first battery cell group 101. In other words, a protrusion is formed on the third circuit board 105, so as to facilitate the electrical connection between the third circuit board 105 and the first upper cover assembly 103 or the second upper cover assembly 104.

[0066] In some embodiments, the first connection terminal 133, the second connection terminal 143, the third connection terminal 153, and the fourth connection terminal 163 can be arranged in a tweezer-like shape, so as to clamp the ninth connection terminal 115, the tenth connection terminal 125, the eleventh connection terminal 135, and the twelfth connection terminal 145 in a one-to-one correspondence. On the one hand, it is convenient for the electrical connection and disconnection between the first circuit board 123 and the third circuit board 105. On the other hand, the electrical connection between the first circuit board 123 and the third circuit board 105 has a certain reliability.

[0067] It can be understood that the two ends of the first connection terminal 133 are in contact with each other in the natural state. When the first connection terminal 133 is in contact connection with the ninth connection terminal 115, the two ends of the first connection terminal 133 are separated, and the ninth connection terminal 115 is clamped between the two ends of the first connection terminal 133. Due to the elastic potential energy of the first connection terminal 133, the connection between the first connection terminal 133 and the ninth connection terminal 115 has a certain reliability.

[0068] In some embodiments, the third positive output terminal 173 and the third negative output terminal 183 can also be set in a tweezer-like shape, so as to facilitate the connection with the electrical device.

[0069] In some embodiments, the first connection line 193 can be printed in the first circuit board 123 as a pre-set connection line on the first circuit board 123.

[0070] In some embodiments, the first circuit board 123 further includes: a first serial communication port 203, which is located between the third positive output terminal 173 and the third negative output terminal 183. On the one hand, the first serial communication port 203 is set as a communication port. On the other hand, the third positive output terminal 173 and the third negative output terminal 183 can also be spaced apart to avoid short circuit between the third positive output terminal 173 and the third negative output terminal 183.

[0071] Reference Figure 6 , Figure 6 is a schematic structural diagram of the second upper cover assembly 104 provided by an embodiment of the present disclosure.

[0072] In some embodiments, the second upper cover assembly 104 includes: a second protective housing 114, which is detachably connected to the lower housing 100; a second circuit board 124, which is embedded in the second protective housing 114. The second circuit board 124 is connected in parallel with the first battery cell group 101 and the second battery cell group 102 and outputs a second electrical signal. The second circuit board 124 is also a structure that realizes the parallel connection of the first battery cell group 101 and the second battery cell group 102. By embedding the second circuit board 124 in the second protective housing 114, the second circuit board 124 can be directly disassembled synchronously when the second upper cover assembly 104 is disassembled, so as to facilitate the replacement between the first upper cover assembly 103 and the second upper cover assembly 104 and improve the convenience of replacing the output signal.

[0073] In some embodiments, the second protective housing 114 can play a role in protecting the second circuit board 124. The second circuit board 124 can be locked to the second protective housing 114 by screws, so as to improve the tightness of the connection between the second circuit board 124 and the second protective housing 114.

[0074] An output port can be provided on the second protective housing 114, which facilitates leading out the electrical signals of the second circuit board 124 and also facilitates the connection between the battery pack and the electrical device.

[0075] With reference to Figures 7 to 9 , wherein, Figure 7 FIG. is a schematic structural diagram of a second circuit board provided by an embodiment of the present disclosure, Figure 8 FIG. is a circuit diagram of a parallel connection of a first battery cell group and a second battery cell group provided by an embodiment of the present disclosure, Figure 9 FIG. is a schematic structural diagram corresponding to a second circuit board and a third circuit board provided by an embodiment of the present disclosure.

[0076] In some embodiments, the first battery cell group 101 includes a first positive output terminal 111 and a first negative output terminal 121, the second battery cell group 102 includes a second positive output terminal 112 and a second negative output terminal 122, and the second circuit board 124 includes: a fifth connection terminal 134, the fifth connection terminal 134 being electrically connected to the first positive output terminal 111; a sixth connection terminal 144, the sixth connection terminal 144 being electrically connected to the first negative output terminal 121; a seventh connection terminal 154, the seventh connection terminal 154 being electrically connected to the second positive output terminal 112; an eighth connection terminal 164, the eighth connection terminal 164 being electrically connected to the second negative output terminal 122; a fourth positive output terminal 174, the fourth positive output terminal 174 being electrically connected to one of the fifth connection terminal 134 and the seventh connection terminal 154; a fourth negative output terminal 184, the fourth negative output terminal 184 being electrically connected to one of the sixth connection terminal 144 and the eighth connection terminal 164; a second connection line 194, one end of the second connection line 194 being electrically connected to the fifth connection terminal 134 and the other end being electrically connected to the seventh connection terminal 154; a third connection line 204, one end of the third connection line 204 being electrically connected to the sixth connection terminal 144 and the other end being electrically connected to the eighth connection terminal 164.

[0077] The fifth connection terminal 134, the sixth connection terminal 144, the seventh connection terminal 154, and the eighth connection terminal 164 are used to lead out the output ports of the first battery cell group 101 and the second battery cell group 102, so as to facilitate the arrangement of the second connection line 194 and the third connection line 204 on the second circuit board 124. The fourth positive output terminal 174 and the fourth negative output terminal 184 serve as the positive output port and the negative output port of the second circuit board 124.

[0078] For the parallel connection of the first battery cell group 101 and the second battery cell group 102, it is necessary to electrically connect the positive electrode of the first battery cell group 101 to the positive electrode of the second battery cell group 102, and connect the negative electrode of the first battery cell group 101 to the negative electrode of the second battery cell group 102. Therefore, for the fourth positive output terminal 174, the fourth positive output terminal 174 only needs to be connected to either the positive electrode of the first battery cell group 101 or the positive electrode of the second battery cell group 102. Similarly, for the fourth negative output terminal 184, the fourth negative output terminal 184 only needs to be connected to either the negative electrode of the first battery cell group 101 or the negative electrode of the second battery cell group 102.

[0079] Taking the first battery cell group 101 and the second battery cell group 102 as examples, which can provide electrical signals of 20V and 1Ah respectively, the electrical signals output through the second upper cover assembly 104 are 20V and 2Ah electrical signals.

[0080] It should be noted that the above-mentioned fifth connection terminal 134 is electrically connected to the first positive output terminal 111 only for the purpose of distance description, and it is not limited that the fifth connection terminal 134 can only be electrically connected to the first positive output terminal 111. The fifth connection terminal can also be electrically connected to the first negative output terminal, and only corresponding adjustments need to be made to other connection points.

[0081] In some embodiments, the battery pack may further include: a third circuit board 105. The corresponding description of the third circuit board 105 can refer to the above description. The following is only an explanation of the connection between the second upper cover assembly 104 and the third circuit board 105.

[0082] The fifth connection terminal 134, the sixth connection terminal 144, the seventh connection terminal 154, and the eighth connection terminal 164 can be respectively clamped on the ninth connection terminal 115, the tenth connection terminal 125, the eleventh connection terminal 135, and the twelfth connection terminal 145 one by one. On the one hand, it is convenient for the electrical connection and disconnection between the second circuit board 124 and the third circuit board 105. On the other hand, it makes the electrical connection between the second circuit board 124 and the third circuit board 105 have a certain reliability.

[0083] For the fifth connection terminal 134, the structure of the fifth connection terminal 134 can be the same as that of the first connection terminal 133, and the corresponding description can refer to the description in the above embodiments.

[0084] In some embodiments, the second connecting wire 194 and the third connecting wire 204 can be printed in the second circuit board 124 as the connecting wires preset on the second circuit board 124.

[0085] In some embodiments, the second circuit board 104 further includes: a second serial communication port 214, which is located between the fourth positive output terminal 164 and the fourth negative output terminal 174. On the one hand, the second serial communication port 214 is set as a communication port. On the other hand, the fourth positive output terminal 174 and the fourth negative output terminal 174 can also be spaced apart, so as to avoid a short circuit between the fourth positive output terminal 164 and the fourth negative output terminal 174.

[0086] In some embodiments, the first upper cover assembly 103 is provided with a first anti-misinsertion structure, and the second upper cover assembly 104 is provided with a second anti-misinsertion structure, and the first anti-misinsertion structure is different from the second anti-misinsertion structure. By setting the first anti-misinsertion structure and the second anti-misinsertion structure to be different, the situation of misinsertion can be avoided. Specifically, it can avoid accessing the second upper cover assembly 104 when high-voltage output is required, or when accessing the first upper cover assembly 103, it can avoid the structure in series with the first battery cell group 101 and the second battery cell group 102 becoming parallel connection of the first battery cell group 101 and the second battery cell group 102 due to mixed connection, thereby improving the reliability of the required electrical signal output.

[0087] It should be noted that the difference between the first anti-misinsertion structure and the second anti-misinsertion structure here can refer to the difference in their structures, or the difference in their positions. The first anti-misinsertion structure and the second anti-misinsertion structure can be adjusted according to the actual situation.

[0088] In some embodiments, the first upper cover assembly 103 and / or the second upper cover assembly 104 may not only include one positive output terminal and one negative output terminal. Taking the first upper cover assembly 103 as an example, the first upper cover assembly 103 may include a third positive output terminal 173, a third negative output terminal 183, a fifth positive output terminal 213, and a fifth negative output terminal 223. Among them, the third positive output terminal 173 and the third negative output terminal 183 are used to output the signal of the series connection of the first battery cell group 101 and the second battery cell group 102, and the fifth positive output terminal 213 and the fifth negative output terminal 223 are used to output the signal of the parallel connection of the first battery cell group 101 and the second battery cell group 102. In this way, when the second upper cover assembly 104 has an abnormality, different electrical signals can also be selected by selecting the output ports of the first upper cover assembly 103. For the second upper cover assembly 104, the second upper cover assembly 104 can also have more output ports. The corresponding description refers to the description of the first upper cover assembly 103 and will not be repeated hereinafter.

[0089] In some embodiments, more battery cell groups can be provided in the battery pack, such as 3 groups, 5 groups, or 8 groups, etc. Correspondingly, more upper cover assemblies are connected in cooperation therewith, so as to output more possible electrical signals, further improving the versatility of the battery pack.

[0090] ReferenceFigure 10 , Figure 10 Schematic structural diagram of a snap structure provided by an embodiment of the present disclosure.

[0091] In some embodiments, the battery pack may further include a snap structure 106, and the snap structure 106 is used to reinforce the tightness of the connection between the first upper cover assembly 103 or the second upper cover assembly 104 and the lower housing.

[0092] The embodiment of the present disclosure provides a battery pack, which provides a power signal through the first battery cell group 101 and the second battery cell group 102. When high-voltage output is required, the first upper cover assembly 103 and the lower housing 100 are assembled together, so that the first battery cell group 101 and the second battery cell group 102 are connected in series to output a higher voltage. When low-voltage output is required, the second upper cover assembly 104 and the lower housing 100 are assembled together, so that the first battery cell group 101 and the second battery cell group 102 are connected in parallel. In this way, it is realized that a battery pack can take into account both the output of the first electrical signal and the output of the second electrical signal, and different power consumption strategies can be selected according to the actual power consumption situation, improving the convenience of the battery pack.

[0093] Another embodiment of the present disclosure further provides a power tool, which may include the battery pack in some or all of the above embodiments. It should be noted that for the same or corresponding parts of the foregoing embodiments, reference may be made to the corresponding descriptions of the foregoing embodiments, which will not be repeated hereinafter.

[0094] Those of ordinary skill in the art can understand that the above embodiments are specific embodiments for implementing the present disclosure. In actual applications, various changes can be made in form and details without departing from the spirit and scope of the embodiments of the present disclosure. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the embodiments of the present disclosure. Therefore, the protection scope of the embodiments of the present disclosure should be subject to the scope defined by the claims.

Claims

1. A battery pack, characterized in that: include: A lower shell having a receiving space; A first battery cell group, wherein the first battery cell group is fixed in the accommodation space; a second battery cell group, wherein the second battery cell group is fixed in the accommodation space; A first upper cover assembly, wherein the first upper cover assembly is detachably connected to the lower housing, and during the connection between the first upper cover assembly and the lower housing, the first upper cover assembly is used to connect the first battery cell group and the second battery cell group in series and output a first electrical signal; The second upper cover assembly is detachably connected to the lower shell, and during the connection between the second upper cover assembly and the lower shell, the second upper cover assembly is used to connect the first battery cell group and the second battery cell group in parallel and output a second electrical signal.

2. The battery pack according to claim 1, characterized in that: The first upper cover assembly comprises: A first protective shell, wherein the first protective shell is detachably connected to the lower shell; A first circuit board is embedded in the first protective housing, the first circuit board is connected in series with the first battery cell group and the second battery cell group, and outputs the first electrical signal.

3. The battery pack according to claim 2, characterized in that: The first battery cell group includes a first positive output terminal and a first negative output terminal, the second battery cell group includes a second positive output terminal and a second negative output terminal, and the first circuit board includes: a first connection end, the first connection end being electrically connected to the first positive output end; a second connection end, the second connection end being electrically connected to the first negative output end; a third connection terminal, the third connection terminal being electrically connected to the second positive output terminal; a fourth connection terminal, the fourth connection terminal being electrically connected to the second negative output terminal; a third positive output terminal, the third positive output terminal being electrically connected to one of the first connection terminal and the third connection terminal; a third negative output terminal, the third negative output terminal being electrically connected to one of the second connection terminal and the fourth connection terminal; A first connection line, wherein one end of the first connection line is electrically connected to the other of the first connection end and the third connection end, and the other end of the first connection line is electrically connected to the other of the second connection end and the fourth connection end.

4. The battery pack according to claim 3, characterized in that: The first circuit board also includes: A first serial communication port is located between the third positive output terminal and the third negative output terminal.

5. The battery pack according to claim 1, characterized in that: The second upper cover assembly comprises: A second protective shell, wherein the second protective shell is detachably connected to the lower shell; A second circuit board is embedded in the second protective housing, the second circuit board is connected in parallel with the first battery cell group and the second battery cell group, and outputs the second electrical signal.

6. The battery pack according to claim 5, characterized in that: The first battery cell group includes a first positive output terminal and a first negative output terminal, the second battery cell group includes a second positive output terminal and a second negative output terminal, and the second circuit board includes: a fifth connection terminal, the fifth connection terminal being electrically connected to the first positive output terminal; a sixth connection terminal, the sixth connection terminal being electrically connected to the first negative output terminal; a seventh connection terminal, the seventh connection terminal being electrically connected to the second positive output terminal; an eighth connection terminal, the eighth connection terminal being electrically connected to the second negative output terminal; a fourth positive output terminal, the fourth positive output terminal being electrically connected to one of the fifth connection terminal and the seventh connection terminal; a fourth negative output terminal, the fourth negative output terminal being electrically connected to one of the sixth connection terminal and the eighth connection terminal; a second connection line, wherein one end of the second connection line is electrically connected to the fifth connection end, and the other end of the second connection line is electrically connected to the seventh connection end; A third connecting line, one end of the third connecting line is electrically connected to the sixth connecting end, and the other end of the third connecting line is electrically connected to the eighth connecting end.

7. The battery pack according to claim 6, characterized in that: The second circuit board also includes: A second serial communication port, wherein the second serial communication port is located between the fourth positive output terminal and the fourth negative output terminal.

8. The battery pack according to claim 1, characterized in that: The first upper cover assembly is provided with a first fool-proof structure, and the second upper cover assembly is provided with a second fool-proof structure, and the first fool-proof structure is different from the second fool-proof structure.

9. The battery pack according to claim 1, characterized in that: The battery pack further comprises: A third circuit board is fixed in the lower shell, electrically connected to the first battery cell group and the second battery cell group, and leads out output ends of the first battery cell group and the second battery cell group.

10. An electric tool, characterized in that: Comprising a battery pack as described in any one of claims 1 to 9.

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