CN117317404A - Battery pack - Google Patents

Abstract

The application discloses battery package includes: the battery cell group is used for storing electric energy; a power terminal for transmitting power; a communication terminal for transmitting first communication data; wherein, the power terminal includes: a first power terminal in first electrical connection with the battery cell group for transmitting power; a second power terminal, in second electrical connection with the battery cell group, for transmitting power and second communication data; the battery pack further includes: and a control unit electrically connected with at least the second power terminal and the communication terminal, and capable of controlling the conduction state of the second electrical connection.

Description

Battery pack

Technical Field

The application relates to the technical field of energy storage, in particular to a battery pack.

Background

The battery pack that powers the cordless power tool is typically a rechargeable battery pack that can be charged using a charger. However, the battery pack and the charger may have a problem that the update is not synchronized, which may cause the previous generation charger to not normally charge the new generation battery pack.

Disclosure of Invention

In order to solve the defects of the prior art, the purpose of the application is to provide a battery pack which can be compatible with different chargers.

In order to achieve the above object, the present application adopts the following technical scheme:

a battery pack, comprising: the battery cell group is used for storing electric energy; a power terminal for transmitting power; a communication terminal for transmitting first communication data; wherein, the power terminal includes: a first power terminal in first electrical connection with the battery cell group for transmitting power; a second power terminal in a second electrical connection with the battery cell group for transmitting power and second communication data; the battery pack further includes: and a control unit electrically connected with at least the second power terminal and the communication terminal, and capable of controlling the conduction state of the second electrical connection.

In one embodiment, the battery pack further comprises a first switch and a second switch; the first switch and the second switch are connected in series between the second power terminal and the battery cell group.

In one embodiment, the system further comprises a communication module; one end of the communication module is connected with the communication terminal and the second power terminal, and the other end of the communication module is connected with the control unit; the control unit is configured to: judging whether a charger connected with the battery pack is provided with a charger terminal matched with the second power terminal according to the first communication data and/or the second communication data transmitted by the communication module; if yes, controlling the first switch and the second switch to be conducted so as to conduct the second electrical connection, otherwise, controlling the first switch to be disconnected so as to enable the second electrical connection not to be conducted; wherein when the second electrical connection is on, the power and the second communication data can be input from the second power terminal to the battery pack; when the second electrical connection is non-conductive, the power cannot be input from the second power terminal to the battery pack.

In one embodiment, the communication module comprises: a first communication module communicatively connected between the communication terminal and the control unit to acquire the first communication data; and a second communication module communicatively connected between the second power terminal and the control unit to acquire the second communication data.

In one embodiment, the first switch comprises one of a power switching element, a fuse.

In one embodiment, the fuse includes a two-terminal fuse or a three-terminal fuse.

In one embodiment, the second switch comprises a power switching element.

A battery pack, comprising: the battery cell group is used for storing electric energy; a power terminal for transmitting power; a communication terminal for transmitting first communication data; wherein, the power terminal includes: a first power terminal capable of forming a first electrical connection with the battery cell group for transmitting power; a second power terminal capable of forming a second electrical connection with the battery cell group for transmitting power and second communication data; the second power terminal is capable of time-sharing transmission of power and the second communication data.

In one embodiment, the circuit further comprises a first switch and a second switch; the first switch and the second switch are connected in series between the second power terminal and the battery cell group.

In one embodiment, the second electrical connection is conductive when the first switch is conductive; when the first switch is disconnected, the second electrical connection is not conducted; wherein when the second electrical connection is on, the power and the second communication data can be input from the second power terminal to the battery pack; when the second electrical connection is non-conductive, the power cannot be input from the second power terminal to the battery pack.

A battery pack, comprising: the battery cell group is used for storing electric energy; a power terminal for transmitting power; a communication terminal for transmitting first communication data; wherein, the power terminal includes: a first power terminal capable of forming a first electrical connection with the battery cell group for transmitting power; a second power terminal capable of forming a second electrical connection with the battery cell group for transmitting power and second communication data; the ratio of the time of the second power terminal transmitting the power to the time of transmitting the second communication data in one transmission period is 0.1 or more and less than 1.

A battery pack, comprising: the battery cell group is used for storing electric energy; a power terminal for transmitting power; a communication terminal for transmitting first communication data; wherein, the power terminal includes: a first power terminal capable of forming a first electrical connection with the battery cell group for transmitting power; a second power terminal capable of forming a second electrical connection with the battery cell group for transmitting power and second communication data; a first switch and a second switch connected in series between the battery cell group and the second power terminal; when the second switch is turned off, the battery cell group cannot output power to the second power terminal.

Drawings

FIG. 1 is a block diagram of a battery pack in one embodiment of the present application;

FIG. 2 is a block diagram of a battery pack with a portion of the housing removed in one embodiment of the present application;

FIG. 3 is a block diagram of a battery pack internal cell stack and cradle assembly according to one embodiment of the present application;

FIGS. 4a and 4b are exemplary diagrams of cell arrangements in a cell group in one embodiment of the present application;

FIG. 5 is a schematic view of a connection structure of a housing and a bracket assembly according to an embodiment of the present application;

FIG. 6 is a block diagram of a seal assembly in one embodiment of the present application;

FIG. 7 is a block diagram of a seal assembly in one embodiment of the present application;

FIG. 8 is an exploded view of the seal assembly of FIG. 7;

FIG. 9 is a block diagram of a seal cover plate of the seal assembly of FIG. 7;

FIG. 10 is a block diagram of a terminal in a battery pack according to one embodiment of the present application;

FIG. 11 is a block diagram of a terminal in a battery pack according to one embodiment of the present application;

FIG. 12 is a schematic diagram of the electrical connections of a battery pack and a charger in one embodiment of the present application;

FIG. 13 is a schematic diagram of the internal circuitry of a battery pack in one embodiment of the present application;

FIG. 14 is a schematic diagram of a second power terminal time sharing transmission of data and power in one embodiment of the present application;

FIG. 15 is a schematic diagram of the internal circuitry of a battery pack in one embodiment of the present application;

fig. 16 is a schematic diagram of an internal circuit of a battery pack in one embodiment of the present application.

Detailed Description

The present application is described in detail below with reference to the attached drawings and specific embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the application and not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present application are shown in the drawings.

In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. The terms "first," "second," "third," and the like are used merely to distinguish between descriptions and are not to be construed as indicating or implying relative importance.

Referring to fig. 1, a battery pack 100 mainly includes a case 10, at least one battery cell group 11 disposed in the case 10. The battery pack 11 is formed by connecting a plurality of battery cells 111 in series and/or in parallel, wherein the battery cells 111 are connected in different manners, and the rated voltage, rated power or other electrical parameters of the battery pack 100 may be different, so that the connection manners of the battery cells 111 are not limited herein. In this embodiment, a part of the cells 111 are connected in parallel and/or in series to form a cell unit, and a plurality of cell units are connected in parallel and/or in series to form the battery pack 11. As shown in fig. 2 to 8, the number of the battery cell groups 11 in the battery pack 100 is two.

Referring to fig. 2 to 8, the battery pack 100 further includes a holder assembly 12 supporting the battery cell group 11. In this embodiment, the holder assembly 12 includes at least a pair of cell holders 121. Each pair of cell holders 121 can support both ends of one cell group 11. For example, there are two battery cell groups 11 in the battery pack 100, and two pairs of battery cell holders 121 may be correspondingly disposed, that is, four battery cell holders 121 may be disposed. As shown in fig. 2, the cell holders 121 supporting the upper end surface of one cell group 11 may be fixed with the cell holders 121 supporting the lower end surface of the other cell group 11 by means of physical connection such as screws, so that the two cell groups 11 can be stacked up and down. In other alternative embodiments, the sides of a pair of cell supports 121 supporting one cell stack 11 may be physically connected to the sides of a pair of cell supports 121 supporting the other cell stack 11.

In this embodiment, as shown in fig. 3, which is an exploded view of a part of the structure of the battery pack, the cell holder 121 is similar to a cover or a tray. Having a bracket end 1211 and a support wall 1212. Wherein the holder end 1211 can support one of the two tips of the cells 111, the support wall 1212 is used to secure the circumferential side walls of the cells 111. The holder end 1211 has honeycomb-shaped openings, each for receiving one tip of one cell 111, so that the shape of the orthographic projection of the holder end 1211 in a plane parallel to the holder end 1211 is related to the arrangement shape of all the cells 111 in the cell group 11.

The arrangement shapes of the battery cells 111 in the battery cell group 11 are different, the volume of the battery pack 100 is different, and whether the phase change material is arranged in the battery cell group 11 can also affect the volume of the battery pack. Assuming that the battery pack 100 has two battery cell groups 11 stacked up and down, each battery cell group 11 includes 14 battery cells 111, the battery cells 111 are circumferentially wrapped with a phase change material, if the 14 battery cells are arranged according to fig. 4a, the volume of the battery pack 100 is 156×109×195mm ³ The method comprises the steps of carrying out a first treatment on the surface of the If 14 cells are arranged in a staggered manner according to fig. 4b, the volume of the battery pack 100 is 154×99×195mm ³ . If the phase change material is not provided around the cell 111, the volume of the battery pack 11 is reduced. To obtain smaller battery pack volume, the cells 111 in the cell group 11 may be arranged in a staggered manner or combined in other arrangements, which will not be described in detail herein, by changing the arrangement of the cells 111The solution of reducing the volume of the battery pack 100 is within the scope of the present application.

In the present embodiment, the holder end 1211 and one top end of all the cells 111 accommodated in the holder end 1211 collectively form one end face of the cell group 11.

In this embodiment, the cell holder 121 may be fixed with the housing 10, thereby preventing the cell stack 11 from shaking within the housing 10. In one embodiment, as shown in fig. 5, the end surface of the cell holder 121 may be provided with a screw hole 1211, and the cell holder 121 and the housing 10 are fixed by a screw. In one embodiment, the side of the cell holder 121 may also be provided with screw holes to be fixedly connected with the housing 10. In one embodiment, screws securing the housing 10 may also be used to penetrate or semi-penetrate the cell support 121 to secure the cell support 121. In the present embodiment, the number and positions of the screw holes 1211 on the cell holder 121 are not made.

Referring to fig. 6, each of the battery cell groups 11 is provided on both end surfaces with a battery cell connecting piece 112 for electrically connecting at least two battery cells 111 into a battery cell unit. The inability to electrically connect between the cell tabs 112 of different cells may otherwise cause a cell short. For example, conductive dust in the production plant can cause different cell tabs 112 to electrically connect, or inadvertent water ingress during use of the battery pack 100 can also cause different cell tabs 112 to electrically connect. Insulating paper is typically applied to both end faces of the cell stack 11, but insulating paper does not prevent conductive liquid from penetrating from the periphery of the insulating paper to the end faces of the cell stack 11, thereby shorting the cell tabs 112.

In the present embodiment, referring to fig. 7 and 8, sealing members 13 are provided for both end faces of the cell group 11. The sealing members 13 can be fixed to both end surfaces of the cell group 11. The sealing assembly 13 can lead out the cell connecting sheet 112 and form a sealing space with the end face of the cell group 11. The sealed space may have a certain gap or may be a sealed entity. The cell connection sheet 112 led out of the sealing assembly 13 may be that the cell connection sheet 112 is partially exposed outside the sealing assembly 13, or that the cell connection sheet 112 is electrically exposed outside the sealing assembly 13 after being connected with other conductive wires, and that the cell connection sheet 112 is entirely located in the above-mentioned sealing space.

In one embodiment, seal assembly 13 includes a seal sponge 131 and a first circuit board 1321 as shown in fig. 7. Wherein one side of the sealing sponge 131 has an adhesive property to be adhered to one end face of the cell group 11. The first circuit board 1321 is provided on the sealing sponge 131. In general, the first circuit board 1321 may be fixed to the cell holder 121 by a screw, so that the first circuit board 1321 can tightly press the sealing sponge 131. Since the sealing sponge 131 has a certain thickness, when the sealing sponge 131 is fastened between the first circuit board 1321 and the end face of the cell group 11, the sealing sponge 131 can be entirely attached to the cell holder 121, thereby forming a sealed space between the first circuit board 1321 and the end face of the cell group 11.

In this embodiment, the sealing sponge 131 can cover at least the cell connecting pieces 112 on the end faces of the cell groups 11.

In this embodiment, the cell connecting piece 112 has a protruding or protruding connection end 1121 on the end face of the cell group 11, and the connection end 1121 can penetrate the sealing sponge 131. A connection hole 1321 capable of adapting to the shape of the connection terminal 1121 is provided on the first circuit board 1321 so that the connection terminal 1121 can be soldered to the first circuit board 1321. In the present embodiment, the first circuit board 1321 has integrated terminals 1322 corresponding to the respective cell connecting pieces 112 integrated thereon. In this embodiment, a sensor capable of collecting electrical parameters of the battery cells or collecting electrical parameters of the respective battery cells 111 may be further provided on a side of the first circuit board 1321 contacting the sealing sponge 131. That is, the first circuit board 1321 may be a double-sided circuit board, i.e., electronic components may be soldered on both sides of the circuit board.

In an alternative embodiment, two double-sided circuit boards may be fixed at two ends of one cell group 11, or a single-sided circuit board may be fixed at one end of the double-sided circuit board and at one end of the double-sided circuit board. The single-sided circuit board is a circuit board in which only one side can be soldered with electronic components.

In this embodiment, the thickness of the sealing sponge 131 is 0.5mm or more and 1mm or less. Illustratively, the thickness of the sealing sponge 131 may be 0.5mm,0.6mm,0.7mm,0.8mm,0.9mm,1mm, etc.

In one embodiment, the thickness of the sealing sponge 131 bonded on each end face of the cell stack 11 may be different. Illustratively, the thickness of the sealing sponge 131 under the double-sided circuit board is smaller than the thickness of the sealing sponge 131 under the single-sided circuit board. Thus, it is possible to prevent the sensor on the back surface of the first circuit board 1321 from detecting the electrical parameter of the cell group 11 due to the thicker sealing sponge 131.

In this embodiment, the water absorption of the sealing sponge 131 is 2% or less, for example, the water absorption of the sealing sponge 131 is 1.5%,1.2%,1%,0.5%, or the like. The compressive strength of the sealing sponge 131 is 90Kpa or more, and may be 95 Kpa,96 Kpa,97 Kpa,98Kpa,99 Kpa,100 Kpa, for example.

In another embodiment, the seal assembly 13 may further include a seal cover plate 133 as shown in FIG. 8. The sealing cover 133 may be fixed to the cell holder 121 by screws. In the present embodiment, a groove 1331 is provided at the lower edge of the sealing cover plate 133. After the sealing material is injected into the groove 1331, the sealing cover plate 133 is covered on the end face of the battery cell group 11, so that a sealing space between the end face of the battery cell group 11 and the sealing cover plate 133 can be formed. Wherein, the gap at the connection part between the sealing end cap 133 and the cell support 121 can be completely sealed by the sealant in the groove 1331. In this embodiment, the sealing material may be a sealant. In the description of the present embodiment, the same or corresponding reference numerals are given to the same constituent elements as those of the battery pack 100, and detailed description thereof is omitted.

In this embodiment, a second circuit board 1322 is further disposed on an end surface of the battery cell group 11, and the second circuit board 1322 may be a single-sided circuit board. The sealing cover plate 133 seals the second circuit board 1322 on the end face of the battery cell group 11, the second circuit board 1322 is connected with the battery cell connecting sheet 112 through a connecting wire, and the connecting wire can extend out of the sealing end cover 133, so that the second circuit board 1322 is prevented from being sealed in the end cover by the sealing end cover 133.

In this embodiment, an insulating member 133 is further disposed on the end face of the battery cell group 11. In one embodiment, the insulating member 133 may be an insulating paper 133 that can be adhered to the end face of the cell stack 11, or at least can cover the cell tabs 112 on the end face. While the second circuit board 1322 can completely cover the insulating paper or both end faces of the battery cell group 11.

In one embodiment, as shown in fig. 9, the battery pack 100 further includes a power terminal 14, a communication terminal 15, a terminal block 18, and a control circuit board 19. The power terminal 14 and the communication terminal 15 are mounted on the terminal block 18 and electrically connected to the control circuit board 19. The battery pack 100 further includes a terminal sealing case 20, and the terminal sealing case 20 is connected to the terminal block 18. The control circuit board 19 is located between the terminal seal case 20 and the terminal block 18. The control circuit board 19 can be sealed in the terminal sealing case 20 by pouring a sealing material in the terminal sealing case 20. In this embodiment, the sealing material may be a sealant. The sealing material can completely seal the control circuit board 19 and the electronic components thereon within the terminal sealing case 20.

Referring to fig. 1, the battery pack 11 may be electrically connected with a power terminal 14 provided outside the case 10, so that after a charger terminal on the charger is electrically connected with the power terminal 14, the power terminal 14 may transmit power from the charger to the battery pack 11 to charge the battery pack 100. Alternatively, the battery pack 100 can supply power to the tool after the tool connection terminal on the power tool is connected to the power terminal 14. The communication terminal 15 may transmit the first communication data between the battery pack 100 and the charger, or between the battery pack 100 and the power tool.

Referring to the battery pack 100 shown in fig. 12, the power terminals 14 include a first power terminal 141 and a second power terminal 142. The first power terminal 141 can form a first electrical connection with the battery cell 11 for transmitting power, and the second power terminal 142 can form a second electrical connection with the battery cell 11 for transmitting power and second communication data. The first and second power terminals 141 and 142 may be positive terminals in a current loop, among others. By way of example, the first power terminal 141 may be p+ and the second power terminal 142 may be T/c+, that is, the second power terminal 142 is a functionally multiplexed terminal capable of power transmission and communication data transmission.

In this embodiment, the data type or the data attribute of the first communication data and the second communication data may be the same or different. In one embodiment, the first communication data may be control type data, such as a control signal for controlling a discharging parameter of the charger, or a control signal for controlling a conducting state of the switching element, or a control signal for controlling a charging/discharging parameter of the battery cell 11, etc. The second communication data may be a state parameter of the working state of the charger or the battery pack or the electric tool itself, or various electric parameters, etc. In one embodiment, the transmission frequency of the communication terminal 15 transmitting the first communication data is different from the transmission frequency of the second power terminal 142 transmitting the second communication data. In one embodiment, the transmission frequency of the communication terminal 15 transmitting the first communication data is less than the transmission frequency of the second power terminal 142 transmitting the second communication data.

The battery pack 100 shown in fig. 12 may further include a control unit 16. The control unit 16 is electrically connectable to at least the second power terminal 142 and the communication terminal 15 in a control circuit in the battery pack 100, and is capable of controlling the on state of the second electrical connection. In this embodiment, the second electrical connection conduction means that the charger can charge the battery cell group 11 through the second power terminal 142, and the second electrical connection non-conduction means that the electric energy output by the charger cannot charge the battery cell group 11 through the second power terminal 142. That is, whether the second electrical connection is conductive or not is related to whether the electric energy can charge the battery cell group 11 through the second power terminal 142. Even if the path of the electric power output from the battery cell group 11 to the second power terminal 142 is open, the path of the electric power input from the second power terminal 142 and charging the battery cell group 11 is not open, the second electrical connection is considered to be non-conductive.

In the present embodiment, a switching element Q is also connected between the second power terminal 142 and the battery cell group 11 as shown in fig. 12. The control unit 16 may control the second electrical connection to be conductive or non-conductive by controlling the conductive state of the switching element Q.

In the present embodiment, the first electrical connection may not be controlled by the control unit 16, that is, may be directly connected between the first power terminal 141 and the battery cell group 11 through a wire. In one embodiment, a switching element may be provided in the charger to control whether or not the charger power terminal connected to the power terminal 14 of the battery pack 100 in the charger can output electric power. For example, as shown in fig. 13, a relay 23 may be provided between the power output circuit 25 in the charger 200 and the charger power terminal 22. The on state of the relay 23 is controlled by the control unit 16 in the battery pack 100, or the on state of the relay 23 is controlled by the control unit 24 in the charger 200, thereby controlling the charger power terminal 22 to output electric power or controlling the charger power terminal 21 to output electric power. The power output circuit 25 may be a circuit capable of converting ac utility power into charging power that can charge the battery pack 100.

Referring to fig. 13, two switching elements connected in series, i.e., a first switch Q1 and a second switch Q2, are connected between the second power terminal 142 and the battery cell group 11. In one embodiment, the first switch Q1 and the second switch Q2 control semiconductor power devices (e.g., FETs, BJTs, IGBTs, etc.). In one embodiment, the first switch Q1 and the second switch Q2 may also be any other type of solid state switch, such as Insulated Gate Bipolar Transistors (IGBTs), bipolar Junction Transistors (BJTs), and the like.

In this embodiment, the control unit 16 may control the on state of the first switch Q1 and the second switch Q2, and further control the off state of the second electrical connection. Illustratively, the second electrical connection is conductive when the first switch Q1 is conductive and the second switch Q2 is conductive or disconnected; the second electrical connection is not conductive when the first switch Q1 is not conductive and the second switch Q2 is conductive or disconnected. The conducting state of the first switch Q1 is related to whether the electric energy flowing into the second power terminal 142 can charge the battery cell group 11, that is, the second electrical connection is considered to be conducting no matter whether the second switch Q2 is conducting when the first switch Q1 is conducting.

The conductive state of the second switch Q2 may be considered as not affecting the conduction of the second electrical connection. However, when the first switch Q1 is conductive and the second switch Q2 is non-conductive, there is a certain loss of the electrical energy charged by the battery cell 11 through the second power terminal 142 of the charger 200. Preferably, the control unit 16 may control the first switch Q1 to be turned on and the second switch Q2 to be turned on so that the second electrical connection is turned on, and uses the second power terminal 142 as the power terminal for charging.

In addition, the on state of the second switch Q2 is related to whether the reverse transient current generated by the battery pack 100 can be transmitted to the charger through the second power terminal 142. That is, the control unit 16 can prevent the charger or the tool from being damaged due to the instantaneous large current generated when the battery pack 100 is connected to the charger by controlling the conductive state of the second switch Q2. For example, when the charger 200 to which the battery pack 100 is connected does not have a charger terminal matching the second power terminal 142, if the second switch Q2 is turned on, a large current instantaneously in a reverse direction generated by the battery pack 100 may flow through the first switch Q1 and the second switch Q2 and then strike the charger terminal, thereby damaging the charger. Therefore, when the charger 200 to which the battery pack 100 is connected does not have a charger terminal that matches the second power terminal 142, the control unit 16 can control the second switch Q2 to be turned off, avoiding damage to the charger due to the mismatch of the battery pack 100 and the charger 200. That is, although the on state of the second switch Q2 does not affect the conduction of the second electrical connection, in order to avoid the instantaneous large current output from the battery cell 11 from damaging the tool or the charger, the second switch Q2 needs to be disposed between the second power terminal 142 and the battery cell 11.

In this embodiment, the control unit 16 may control the first switch Q1 to be turned on or off, and may also control the second switch Q2 to be turned on or off. Alternatively, the control unit 16 can control the first switch Q1 to be turned on or off, and the second switch Q2 can be initialized to be turned off, and maintained to be turned off without being controlled by the control unit 16. In this embodiment, even if the second switch Q2 is kept in the off state, when the second electrical connection is turned on, the power can also flow through the first switch Q1 via the body diode of the second switch Q2 to charge the battery cell 11. In addition, a large instantaneous current may exist at the moment the battery pack 100 is connected to the charger, and the instantaneous current is transmitted to the charger in a reverberant manner through the second power terminal 142, thereby damaging the charger.

In the present embodiment, the second electric connection is turned on and the electric power and the second communication data can be input from the second electric power terminal 142 to the battery pack 100. The electric power output by the charger passes through the second electric power terminal 142 and then flows through the second electric circuit of the second electric connection to charge the battery cell group 11; the second communication data within the battery pack 100 or the second communication data in the charger can perform data exchange through the second power terminal 142.

Referring to fig. 12, a communication module 17 may also be included within the battery pack 100. In one embodiment, one end of the communication module 17 may be connected to the communication terminal 15 and the second power terminal 142, and the other end of the communication module 17 is connected to the control unit 16. The communication module 17 thus transmits the first communication data from the communication terminal 15 and the second communication data from the second power terminal 142 to the control unit 16. The control unit 16 may recognize whether the charger 200 to which the battery pack 100 is currently connected has a charger terminal matched with the second power terminal 142 according to the received communication data. For example, the first communication data and/or the second communication data may include information that can distinguish whether the charger has a terminal capable of multiplexing charging, communication capability, etc. of the type, hardware configuration, etc. of the charger. That is, whether the charger terminal connected to the second power terminal 142 has the capability of transmitting power and communication data may be used as a basis for the charger 200 to have a charger terminal that matches the second power terminal 142.

In the present embodiment, the communication module 26 in the charger 200 may also be provided with two sub-communication modules with reference to the communication module 17 in the battery pack 100, which is not described in detail in the present application.

In the present embodiment, the initial states of the two switches connected between the second power terminal 142 and the battery cell group 11 are both open states before the battery pack 100 is connected to the charger 200. When the battery pack 100 is connected to the charger 200, the communication terminal 15 is capable of transmitting first communication data between the charger and the battery pack 100, and the control unit 16 may identify the type of the charger based on the received communication data, i.e., determine whether the charger 200 has a charger terminal that matches the second power terminal 142. If the control unit 16 detects that the charger 200 connected to the battery pack 100 has a charger terminal matched to the second power terminal 142, the first switch Q1 and the second switch Q2 may be controlled to be turned on, so that the second electrical connection is turned on, and the charger 200 is able to charge the battery pack 100. In contrast, if the control unit 16 does not detect that the charger 200 connected to the battery pack 100 has a charger terminal matching the second power terminal 142, the first switch Q1 is controlled to be turned off so that the second electrical connection is not turned on, and the charger 200 cannot charge the battery pack through the second power terminal 142.

In the present embodiment, the second communication data received by the second power terminal 142 is transmitted to the control unit 16 via the communication module 17, and the power is transmitted to the battery cell group 11 via the second switch Q2 and the first switch Q1, so that the paths of the second power terminal 142 for transmitting the power and the second communication data are different. If the second electrical connection is non-conductive, the second power terminal 142 transmits only second communication data through the communication unit 17; if the second electrical connection is on, the second power terminal 142 may transmit power through the current path in which the two switches are located, while transmitting second communication data through the communication module 17.

In one embodiment, the second power terminal 142 may transmit power and second communication data in a time sharing manner. The time-sharing transmission may be regarded as transmitting only the power for a period of time and transmitting only the second communication data for a period of time. As shown in fig. 14, the second power terminal 142 may transmit the second communication data for the second period t2 after transmitting the power for the first period t1 in one transmission period. Wherein, the ratio of the first time period t1 to the second time period t2 is more than or equal to 0.1 and less than 1. For example, the ratio of the first time period t1 and the second time period t2 is 0.1,0.2,0.3,0.4,0.5,0.6,0.7,0.8,0.9. In fig. 4, the voltage between the second power terminal 142 and ground is approximately 30V when power is transmitted, and approximately 14V when second communication data is transmitted. In this embodiment, the control unit 16 may preset the first time period and the second time period. It will be appreciated that during time sharing transmission of power and second communication data, the second electrical connection may be either always on or may be off during the period of time that the second power terminal 142 is transmitting second communication data. In order to avoid frequent on-off, the second electrical connection can be always conducted in the process of time-sharing transmission of power and second communication data.

In one embodiment, the communication module 17 may include a first communication module 171 and a second communication module 172 as shown in fig. 13. Wherein the first communication module 171 is communicatively connected between the communication terminal 15 and the control unit 16 to acquire first communication data; the second communication module 172 is communicatively connected between the second power terminal 142 and the control unit 16 to obtain second communication data.

In one embodiment, the first switch Q1 may be a two terminal fuse F1 as shown in fig. 15. The control unit 16 may control the both-end fuse F1 to blow when detecting that the charger 200 does not have the charger terminal matched to the second power terminal 142, so that the second electrical connection is not conducted.

In one embodiment, the first switch Q1 may be a three terminal fuse F2 shown in fig. 16. The control unit 16 may control the three-terminal fuse F2 to blow to disconnect the second electrical connection when detecting that the charger 200 does not have the charger terminal matched to the second power terminal 142. Or when the voltage or current of any one of the battery cell groups 11 exceeds a set value, the control unit 16 can control the three-terminal fuse F2 to blow so as to disconnect the second electrical connection, so as to achieve overcurrent or overvoltage protection on the battery cell group 11.

In the embodiment of the application, the battery pack can be compatible with different types of chargers by multiplexing the power transmission function on one power terminal of the battery pack or multiplexing the communication data transmission function on one power terminal of the battery pack.

The embodiment of the application only shows that the suitability of the power terminal can be detected when the battery pack is connected with the charger for charging. When the battery pack is connected with the electric tool to supply power to the electric tool, the method can also be used for determining whether the tool is provided with a tool terminal capable of multiplexing communication and power transmission, and the application is not repeated.

Note that the above is only a preferred embodiment of the present application and the technical principle applied. Those skilled in the art will appreciate that the present application is not limited to the particular embodiments described herein, but is capable of numerous obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the present application. Therefore, while the present application has been described in connection with the above embodiments, the present application is not limited to the above embodiments, but may include many other equivalent embodiments without departing from the spirit of the present application, the scope of which is defined by the scope of the appended claims.

Claims (12)

1. A battery pack, comprising:

the battery cell group is used for storing electric energy;

a power terminal for transmitting power;

a communication terminal for transmitting first communication data;

wherein, the power terminal includes:

a first power terminal in first electrical connection with the battery cell group for transmitting power;

a second power terminal in a second electrical connection with the battery cell group for transmitting power and second communication data;

the battery pack further includes:

and a control unit electrically connected with at least the second power terminal and the communication terminal, and capable of controlling the conduction state of the second electrical connection.

2. The battery pack of claim 1, wherein the battery pack comprises a plurality of battery cells,

the first switch and the second switch are also included;

the first switch and the second switch are connected in series between the second power terminal and the battery cell group.

3. The battery pack of claim 2, wherein the battery pack comprises a plurality of battery cells,

the communication module is also included;

one end of the communication module is connected with the communication terminal and the second power terminal, and the other end of the communication module is connected with the control unit;

the control unit is configured to:

judging whether a charger connected with the battery pack is provided with a charger terminal matched with the second power terminal according to the first communication data and/or the second communication data transmitted by the communication module;

if yes, controlling the first switch and the second switch to be conducted so as to conduct the second electrical connection, otherwise, controlling the first switch to be disconnected so as to enable the second electrical connection not to be conducted;

wherein when the second electrical connection is on, the power and the second communication data can be input from the second power terminal to the battery pack; when the second electrical connection is non-conductive, the power cannot be input from the second power terminal to the battery pack.

4. The battery pack of claim 3, wherein the battery pack comprises a plurality of battery cells,

the communication module includes:

a first communication module communicatively connected between the communication terminal and the control unit to acquire the first communication data;

and a second communication module communicatively connected between the second power terminal and the control unit to acquire the second communication data.

5. The battery pack of claim 2, wherein the battery pack comprises a plurality of battery cells,

the first switch includes one of a power switching element and a fuse.

6. The battery pack of claim 5, wherein the battery pack comprises a plurality of battery cells,

the fuse includes a two-terminal fuse or a three-terminal fuse.

7. The battery pack of claim 2, wherein the battery pack comprises a plurality of battery cells,

the second switch includes a power switching element.

8. A battery pack, comprising:

the battery cell group is used for storing electric energy;

a power terminal for transmitting power;

a communication terminal for transmitting first communication data;

wherein, the power terminal includes:

a first power terminal capable of forming a first electrical connection with the battery cell group for transmitting power;

a second power terminal capable of forming a second electrical connection with the battery cell group for transmitting power and second communication data;

the second power terminal is capable of time-sharing transmission of power and the second communication data.

9. The battery pack of claim 8, wherein the battery pack comprises a plurality of battery cells,

the first switch and the second switch are also included;

the first switch and the second switch are connected in series between the second power terminal and the battery cell group.

10. The battery pack of claim 9, wherein the battery pack comprises a plurality of battery cells,

when the first switch is conducted, the second electrical connection is conducted;

when the first switch is disconnected, the second electrical connection is not conducted;

wherein when the second electrical connection is on, the power and the second communication data can be input from the second power terminal to the battery pack; when the second electrical connection is non-conductive, the power cannot be input from the second power terminal to the battery pack.

11. A battery pack, comprising:

the battery cell group is used for storing electric energy;

a power terminal for transmitting power;

a communication terminal for transmitting first communication data;

wherein, the power terminal includes:

a first power terminal capable of forming a first electrical connection with the battery cell group for transmitting power;

a second power terminal capable of forming a second electrical connection with the battery cell group for transmitting power and second communication data;

the ratio of the time of the second power terminal transmitting the power to the time of transmitting the second communication data in one transmission period is 0.1 or more and less than 1.

12. A battery pack, comprising:

the battery cell group is used for storing electric energy;

a power terminal for transmitting power;

a communication terminal for transmitting first communication data;

wherein, the power terminal includes:

a first power terminal capable of forming a first electrical connection with the battery cell group for transmitting power;

a second power terminal capable of forming a second electrical connection with the battery cell group for transmitting power and second communication data;

a first switch and a second switch connected in series between the battery cell group and the second power terminal;

when the second switch is turned off, the battery cell group cannot output power to the second power terminal.