CN116111262A - Battery pack, electric tool system and charging combination - Google Patents

Battery pack, electric tool system and charging combination Download PDF

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Publication number
CN116111262A
CN116111262A CN202111327581.6A CN202111327581A CN116111262A CN 116111262 A CN116111262 A CN 116111262A CN 202111327581 A CN202111327581 A CN 202111327581A CN 116111262 A CN116111262 A CN 116111262A
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CN
China
Prior art keywords
cell assembly
battery pack
battery
battery cell
deformation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202111327581.6A
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Chinese (zh)
Inventor
胡桂伍
杨东
胡中操
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Nanjing Chervon Industry Co Ltd
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Nanjing Chervon Industry Co Ltd
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Publication date
Application filed by Nanjing Chervon Industry Co Ltd filed Critical Nanjing Chervon Industry Co Ltd
Priority to CN202111327581.6A priority Critical patent/CN116111262A/en
Publication of CN116111262A publication Critical patent/CN116111262A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/258—Modular batteries; Casings provided with means for assembling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/02—Construction of casings, bodies or handles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/211—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for pouch cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
    • H01M50/24—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions adapted for protecting batteries from their environment, e.g. from corrosion
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
    • H01M50/242—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions adapted for protecting batteries against vibrations, collision impact or swelling
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/244—Secondary casings; Racks; Suspension devices; Carrying devices; Holders characterised by their mounting method
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/247—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for portable devices, e.g. mobile phones, computers, hand tools or pacemakers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biophysics (AREA)
  • Computer Hardware Design (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

The invention discloses a battery pack, an electric tool system and a charging combination, comprising: a housing composed of an upper housing and a lower housing; a cell assembly; a seal positioned on at least one side of the cell assembly to seal the cell assembly within the interior cavity; the deformation sensor is arranged on the surface of the battery cell assembly and used for detecting parameters related to deformation of the battery cell assembly; the first support plate is positioned on the upper side of the battery cell assembly; the deformation sensor is at least partially positioned between the cell assembly and the sealing member; the lower surface of the first supporting plate is provided with or connected with a protruding part, and the protruding part is positioned above the deformation sensor and is spaced with the upper surface of the sealing element by a preset distance. By adopting the technical scheme, the potential safety hazard of explosion caused by internal deformation of the battery pack can be reduced, and the safety and reliability of the battery pack are improved.

Description

Battery pack, electric tool system and charging combination
Technical Field
The invention relates to a battery pack, an electric tool system and a charging combination.
Background
Based on the portable use requirements, more and more electric tools currently use battery packs as a power source.
The existing battery pack for supplying power to the electric tool mostly adopts a cylindrical lithium battery core, and adopts serial-parallel connection of a plurality of cylindrical lithium battery cores to ensure enough electric energy output so as to improve the cruising ability and the operating efficiency of the electric tool.
The cylindrical lithium battery core generates a small amount of gas in the battery due to evaporation of lithium ion electrolyte in the charging process, and the gas is absorbed when the battery is discharged under normal conditions, however, the generation of the gas is aggravated due to too large charging and discharging current caused by long charging time of the battery, so that the internal pressure of the battery is increased, and the expansion phenomenon of the battery occurs. In addition, the battery can possibly cause expansion deformation of the battery during collision with external force and manufacturing process, so that the battery characteristics are influenced, and further the service life and stability of the battery are influenced. With the development of battery technology, pouch-shaped batteries are produced, but flexible housings are generally used, so that the pouch-shaped batteries are more prone to swelling deformation during charge and discharge. In addition, in the worst case, combustible gases such as electrolyte or broken objects may be discharged to the outside, which may cause a fire or explosion.
Therefore, when the electric tool is powered by the battery pack, the potential safety hazard of explosion caused by the expansion and deformation of the battery pack is easy to occur.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide a battery pack, an electric tool system and a charging system, which can reduce potential safety hazards caused by explosion due to internal expansion deformation of the battery pack and improve the safety and reliability of the battery pack.
In order to achieve the above object, the present invention adopts the following technical scheme:
a battery pack, comprising: a housing comprising an upper housing and a lower housing assembled at an interface to form an interior cavity; the battery cell assembly comprises a plurality of battery cell units; a seal positioned at least on one side of the cell assembly to seal the cell assembly within the interior cavity; the deformation sensor is arranged on the surface of the battery cell assembly and used for detecting parameters related to deformation of the battery cell assembly; the first support plate is positioned on the upper side of the battery cell assembly, and an accommodating space for accommodating the battery cell assembly is formed between the first support plate and the lower shell; the variable sensor is at least partially located between the cell assembly and the seal; the lower surface of the first supporting plate is provided with or connected with a protruding portion, and the protruding portion is located above the deformation sensor and is spaced from the upper surface of the sealing element by a preset distance.
Further, the method further comprises the following steps: the battery pack interface is at least electrically connected with the electric core component; a controller configured to: when the deformation sensor detects that parameters related to the deformation of the battery cell assembly meet a first preset condition, the electric connection between the battery cell assembly and the battery pack interface is cut off.
Further, the sealing element can be deformed according to the change of the battery cell assembly, and the sealing element can be abutted against the lower surface of the protruding portion after being deformed.
Further, the deformation sensor includes a first connection line electrically connected to the controller, the first connection line being at least partially located between the first support plate and the seal.
Further, the preset distance is in a range of greater than or equal to 1 millimeter and less than or equal to 6 millimeters.
Further, the method further comprises the following steps: the alarm is connected with the controller; the controller is configured to: and outputting an alarm signal to trigger the alarm to alarm when the deformation sensor detects that the parameters related to the deformation of the battery cell assembly meet preset conditions.
Further, the deformation sensor includes a detection terminal; the controller is configured to: acquiring an output signal of the detection terminal to judge whether the deformation sensor works normally or not; and when the output signal meets a second preset condition, cutting off the electrical connection between the battery cell assembly and the battery pack interface.
Further, the controller is configured to: acquiring an output signal of the detection terminal to judge whether parameters related to the deformation of the battery cell assembly meet a first preset condition or not; and when the output signal meets a first preset condition, cutting off the electrical connection between the battery cell assembly and the battery pack interface.
Further, the sealing element is formed around the battery cell assembly in a glue injection mode.
A power tool system comprising: the electric tool comprises an output shaft and a motor for driving the output shaft to rotate; a battery pack for providing electric power to the electric tool; the battery pack includes: a housing comprising an upper housing and a lower housing assembled at an interface to form an interior cavity; the battery cell assembly comprises a plurality of battery cell units; a seal is positioned at least on one side of the cell assembly to seal the cell assembly within the interior cavity; the battery pack interface is electrically connected with the battery cell assembly and is connected with the electric tool to provide electric energy for the electric tool; the battery cell assembly, the battery pack interface and the motor form a discharging loop, and the motor consumes the electric energy of the battery cell assembly; the deformation sensor is arranged on the surface of the battery cell assembly and used for detecting parameters related to deformation of the battery cell assembly; the first support plate is positioned on the upper side of the lower shell, and an accommodating space for accommodating the battery cell assembly is formed between the first support plate and the lower shell; the deformation sensor is at least partially positioned between the battery cell assembly and the sealing element, a protruding portion is formed or connected on the lower surface of the first supporting plate, and the protruding portion is positioned above the deformation sensor and is spaced by a preset distance from the upper surface of the sealing element.
Further, the method further comprises the following steps: a switch disposed on the discharge loop; a controller configured to: when the deformation sensor detects that the parameters related to the deformation of the battery cell assembly meet a first preset condition, a control signal for enabling the switch to be disconnected is output so as to cut off the discharge loop.
A charging assembly comprising: a charger including a charging circuit; a battery pack for providing electric power to the electric tool; the battery pack includes: a housing comprising an upper housing and a lower housing assembled at an interface to form an interior cavity; the battery cell assembly comprises a plurality of battery cell units; a seal positioned at least on one side of the cell assembly to seal the cell assembly within the interior cavity; the battery pack interface is electrically connected with the battery cell assembly and is connected with the charging circuit to provide electric energy for the battery cell assembly; the battery cell assembly, the battery pack interface and the charging circuit form a charging loop; the deformation sensor is arranged on the surface of the battery cell assembly and used for detecting parameters related to deformation of the battery cell assembly; the first support plate is positioned on the upper side of the lower shell, and an accommodating space for accommodating the battery cell assembly is formed between the first support plate and the lower shell; the deformation sensor is at least partially positioned between the battery cell assembly and the sealing element, a protruding portion is formed or connected on the lower surface of the first supporting plate, and the protruding portion is positioned above the deformation sensor and is spaced by a preset distance from the upper surface of the sealing element.
Further, the method further comprises the following steps: a switch disposed on the charging circuit; a controller configured to: when the deformation sensor detects that the parameters related to the deformation of the battery cell assembly meet a first preset condition, a control signal for enabling the switch to be disconnected is output so as to cut off the charging loop.
The battery pack and the electric tool adopting the battery pack have the advantages that the potential safety hazard of explosion caused by internal deformation of the battery pack is reduced, and the safety and reliability of the battery pack are effectively improved.
Drawings
FIG. 1 is a schematic diagram of a power tool system provided in an embodiment;
FIG. 2 is a perspective view of the power tool of FIG. 1;
fig. 3 is a structural exploded view of the battery pack provided in the embodiment;
fig. 4 is a structural exploded view of the battery pack removal case shown in fig. 3;
fig. 5 is a structural view of the first support plate shown in fig. 4;
fig. 6 is a cross-sectional view of the battery pack removal case shown in fig. 1;
fig. 7 is a block diagram of a protection circuit of a battery pack in the first embodiment;
fig. 8 is a block diagram of a protection circuit for a power tool system in the second embodiment;
fig. 9 is a block diagram of a protection circuit for a charging combination in the third embodiment.
Detailed Description
The invention is described in detail below with reference to the drawings and the specific embodiments.
Fig. 1 illustrates a power tool system 100 including a power tool 10 and a battery pack 20 that may be adapted to power the power tool 10. In fig. 1, the power tool 10 is an impact wrench. While the present embodiment relates to an impact wrench, it should be understood that the present application is not limited to the disclosed embodiments, but is applicable to other types of power tools 10, such as garden-type tools for lawnmowers, pruners, blowers, chain saws, etc.; the tool may be a torque output tool such as an electric drill or an electric hammer, a saw cutting tool such as an electric circular saw, a jig saw or a reciprocating saw, or a grinding tool such as a corner grinder or a sander.
Referring to fig. 2, the electric power tool 10 includes a tool body 11, and a tool interface 12 and a tool engaging portion 13 provided on the tool body 11 for detachable connection with a battery pack 20. In some embodiments, the tool engagement portion 13 is configured such that the battery pack 20 is detachable therefrom when a user slides the battery pack 20 toward the front of the body of the power tool 10. The tool body 11 includes a motor 111, an output shaft 112, and an impact mechanism 113. The output shaft 112 is driven by the motor 111; the impact mechanism 113 connects the motor 111 and the output shaft 112, and the impact mechanism 113 is driven by the motor 111 and applies an impact force to the output shaft 112. The body of the power tool 10 also includes a handle 114 that can be grasped by a user to operate the power tool 10. A trigger switch 115 is also provided on the handle, the trigger switch 115 being for actuation by a user of the power tool 10 to start or stop operation of the motor 111.
Referring to fig. 3 to 6, the battery pack 20 includes a battery pack interface 21, a battery pack coupling part 22, a case 23, and a battery cell assembly 24. The voltage of the battery pack 20 is usually 10.8V, 24V, 36V, 48V, 56V or 80V, the capacity of the battery pack 20 is 5Ah or more, and further, the capacity of the battery pack is 9Ah or more. The battery pack 20 is provided with a battery pack interface 21 and a battery pack coupling portion 22. The battery pack interface 21 is configured to adapt the tool interface 12 to power the power tool 10, and the battery pack interface 21 is further configured to adapt the charger 30 to enable the charger 30 to charge the battery pack 20. The battery pack coupling portion 22 can be detachably connected with the tool engaging portion 13 or the charger 30 to enable the battery pack 20 to supply power to the power tool 10 or enable the charger 30 to charge the battery cell assembly 24.
The housing 23 includes an upper housing 231 and a lower housing 232 assembled at an interface to form an inner cavity. Wherein the upper housing 231 and the lower housing 232 are assembled to form an inner cavity for fixing and accommodating the cell assembly 24.
The cell assembly 24 is disposed within an interior cavity formed by the housing 23. The cell assembly 24 includes a plurality of cell units 241. The battery cell assembly 24 also includes a battery cell assembly positive terminal (not shown) and a battery cell assembly negative terminal (not shown) for outputting electrical energy from the battery cell assembly 24 or inputting electrical energy to charge the battery cell assembly 24. Typically, a plurality of battery cells 241 are connected in series, parallel, or a combination of series and parallel to form the battery assembly 24. The voltage of the single cell unit 241 is 4.2V. In some embodiments, the cell 241 is a cylindrical structure, such as a 18650 type battery. In other embodiments, the battery cell 241 has a flat bag-like structure, and the plurality of battery cells 241 are stacked in the up-down direction, and the battery cell 241 may be bent into an arc-shaped structure, such as a soft pack battery pack. The battery cell 241 further includes a battery cell housing (not shown), and the cylindrical battery typically uses a steel case as the battery cell housing, and the soft package battery pack typically uses an aluminum plastic film as the battery cell housing. It is to be understood that the present application is not limited to the disclosed embodiments, and that the structure of the cell 241 is not limited thereto.
The battery pack 20 further includes a first support plate 25, a circuit board 26, and a seal 27. Wherein, the circuit board 26 is disposed on the upper side of the first support plate 25 for collecting the electrical signals related to the battery pack 20.
The first support plate 25 is positioned at an upper side of the lower case 232, and forms an accommodating space accommodating the cell assembly 24 with the lower case 232. The first support plate 25 is detachably coupled with the lower case 232 to form an accommodating space to accommodate the battery cell assembly. Similarly, the first support plate 25 and the upper housing 231 also form an accommodating space for accommodating the circuit board 26 and the like. Specifically, the first support plate 25 has a flat plate structure, and the first support plate 25 is detachably connected to the lower housing 232.
A seal 27, the seal 27 being located on at least one side of the cell assembly 24 to protect said cell assembly 24. The cell assembly 24 has upper and lower surfaces, front and rear end surfaces disposed between the upper and lower surfaces, and left and right side surfaces disposed on both sides of the first end surface. Wherein the front end face and the rear end face are arranged oppositely. In some embodiments, the seal 27 is disposed around the cell assembly 24, i.e., the seal 27 is disposed around the upper, lower, front, rear, left and right sides of the cell assembly 24 for sealing the cell assembly 24 for water, dust, etc. The seal 27 serves to protect the cell assembly 24 from relative displacement that may occur between the cell units 241 due to jolts or shocks, thereby avoiding the occurrence of extrusion or kinking of the cell units 241 or tabs. Therefore, the sealing member 27 can improve the anti-falling shock absorbing performance of the battery pack 20, thereby improving the reliability of the battery pack 20. The seal 27 is configured to better accommodate the swelling material of the battery pack 20. Moreover, the sealing member 27 also improves the heat dissipation performance of the battery pack 20. In some embodiments, the seal 27 is formed around the cell assembly 24 by way of glue injection. Specifically, the battery cell assembly 24 is placed in the lower casing 232, and a sealing member 27 is formed on the outer surface of the whole battery cell assembly 24 in a glue injection manner so as to seal the battery cell assembly 24 to realize functions of water resistance, dust resistance and the like.
In some embodiments, the battery pack 20 further includes a deformation sensor 28, where the deformation sensor 28 is disposed on the upper surface of the cell assembly 24 for detecting a parameter related to the deformation of the cell assembly 24. Specifically, the deformation sensor 28 is located between the cell assembly 24 and the seal 27. During assembly, the cell assembly 24 is placed in the lower housing 232, the deformation sensor 28 is fixed to the upper surface of the cell assembly 24, and finally the sealing member 27 is formed by injecting glue to seal the cell assembly 24 and the deformation sensor 28. The deformation sensor 28 further comprises a first connection line 281 for transmitting an electrical signal. The first connection wire 281 is electrically connected to the circuit board 26 to output a sensing signal of the deformation sensor 28 to the circuit board 26. As an embodiment, the deformation sensor 28 is a pressure sensor, and the deformation sensor 28 is capable of outputting a sensing signal when receiving pressure.
The first support plate 25 is positioned at the upper side of the cell assembly 24 and forms an accommodating space accommodating the cell assembly 24 with the lower case 232. The first support plate 25 is detachably coupled with the lower case 232 to form an accommodating space to accommodate the battery cell assembly. A boss 251 provided opposite to the deformation sensor 28 in the up-down direction is formed or attached to the lower surface of the first support plate 25. Since the battery cell assembly 24 has a certain deformation during normal operation, a preset distance is reserved between the deformation sensor 28 and the sealing element 27, so that the deformation of the battery cell assembly 24 during normal operation can be ensured, the reliability of the deformation sensor 28 is improved, and the probability of false triggering is reduced. Referring to fig. 6, the boss 251 is spaced apart from the upper surface of the sealing member 27 by a preset distance H. Specifically, the preset distance H is preferably set to be greater than or equal to 1mm and less than or equal to 6mm. Of course, it is understood that the preset distance H set in the present embodiment is set depending on the internal structure of the battery pack, and is not limited to the present embodiment. Those skilled in the art should set a reasonable preset distance according to the actual structure inside the battery pack.
The present invention can adapt to the protection requirements of various battery packs by the structure that the protrusion 251 can be automatically arranged to be spaced from the upper surface of the sealing member 27 by a preset distance H
In the above-described embodiment, when the cell assembly 24 is deformed, for example, the cell assembly 24 expands to cause an increase in thickness in the up-down direction, and the expanded cell assembly 24 deforms the sealing member 27 in the up-down direction. It will be appreciated that since the deformation sensor 28 is disposed between the cell assembly 24 and the seal 27, when the cell assembly 24 expands, the deformation sensor 28 will also displace upward as the expansion occurs. When the expansion of the cell assembly 24 reaches a certain level, the cell assembly 24 deforms the seal 27 upward and contacts the boss 251 on the first support plate 25 and generates a force. When the deformation sensor 28 senses the pressure from the boss 251 on the first support plate 25 to output a sensing signal, the sensing signal is transmitted to the circuit board 26 through the first connection line 281.
Fig. 7 shows a block diagram of a protection circuit of the battery pack 20. The battery pack protection circuit 30 includes: the battery cell assembly 24, the switch 291, the controller 29, the battery pack interface 21, and the deformation sensor 28. The switch 291 is disposed between the battery cell assembly 24 and the battery pack interface 21, and is used for turning on or off the electrical connection between the battery cell assembly 24 and the battery pack interface 21. In some embodiments, the switch 291 is disposed between the positive and negative poles of the cell assembly 24. In other embodiments, the switch 291 is disposed between the negative electrode of the cell assembly 24 and the negative electrode of the battery pack 20. . Specifically, the switch 291 is provided on the circuit board 26, and the switch 291 may be a metal oxide semiconductor transistor (MOS transistor), or may be an electronic switch such as an Insulated Gate Bipolar Transistor (IGBT) or a relay.
The controller 29 is connected to at least the switch 291 and the strain sensor 28. In this embodiment, the controller 29 is disposed on the circuit board 26. The controller 29 is configured to output a control signal to turn off the switch 291 to cut off the electrical connection between the battery cell assembly 24 and the battery pack interface 21 when the deformation sensor 28 detects that the parameter related to the deformation amount of the battery cell assembly 24 satisfies the first preset condition. The deformation sensor 28 includes at least a detection terminal 282, and the detection terminal 282 is electrically connected to the controller 29 through a first connection line 281. In this embodiment, the parameter related to the deformation of the cell assembly 24 detected by the deformation sensor 28 is optionally set as a voltage parameter. Specifically, after the deformation sensor 28 is powered on, the output voltage of the detection terminal 282 is continuously changed according to the pressure change applied to the deformation sensor 28. Therefore, the controller 29 is specifically configured to obtain the output voltage of the detection terminal 282, and output a control signal for opening the switch 291 to disconnect the electrical connection between the battery cell assembly 24 and the battery pack interface 21 when the output voltage of the detection terminal 282 is less than or equal to the first preset voltage. In the present embodiment, since the resistance of the deformation sensor 28 decreases as the pressure applied to the battery cell assembly 24 is gradually increased, the voltage of the detection terminal 282 is continuously decreased as the pressure applied to the deformation sensor 28 is increased, until the voltage decreases to the first preset voltage, the controller 29 controls the switch 291 to be turned off, so as to cut off the electrical connection between the battery cell assembly 24 and the battery pack interface 21, and protect the safety of the battery pack 20. Specifically, the deformation sensor 35 may be one of a strain type pressure sensor, a piezoresistive type pressure sensor, a capacitive type pressure sensor, a piezoelectric type pressure sensor, an inductance type pressure sensor, or a hall type pressure sensor, and thus, the parameter related to the deformation amount of the cell assembly 24 acquired by the controller 29 may also be a resistance value, a current value, an inductance value, or the like according to the selected deformation sensor 28, which is not limited herein. It is understood that the present application includes, but is not limited to, the disclosed embodiments, and the preset conditions for controlling the switch 291 to be turned on or off may be different depending on the specific circuit of the deformation sensor 28 by the controller 29. For example, the controller 29 may be further configured to output a control signal to turn off the switch 291 to cut off the electrical connection between the battery cell assembly 24 and the battery pack interface 21 when the output voltage of the detection terminal 282 is greater than or equal to a first preset voltage, so as to secure the battery pack.
In other embodiments, the battery pack protection circuit 40 includes an alarm 41 that can be triggered to alarm. The controller 29 is configured to output an alarm signal to trigger the alarm 41 to alarm when the deformation sensor 28 detects that the parameter related to the deformation of the cell assembly 24 meets a first preset condition. The alarm 41 may be specifically a buzzer, and the buzzer is triggered to alarm and then buzzes to remind a user that the battery pack has potential safety hazards. The alarm 41 may also be other electronic devices, such as an LED lamp, etc., that can be triggered to flash to alert the user to the potential safety hazard of the deformation of the battery cell assembly 24 of the battery pack 20.
In order to further improve the reliability of the deformation sensor 28, the controller 29 needs to determine whether the deformation sensor 28 is reliable before determining whether the cell assembly 24 is deformed. In some embodiments, the controller 29 obtains the output signal of the detection terminal 282 to determine whether the deformation sensor 28 is in a normal operating state. When the output signal of the detection terminal 282 meets the second preset condition, the controller 29 cuts off the electrical connection between the battery cell assembly 24 and the battery pack interface 21. Specifically, the controller 29 acquires the output voltage of the detection terminal 282, and outputs a control signal to turn off the switch 291 to cut off the electrical connection between the cell assembly 24 and the battery pack interface 21 when the voltage is greater than a second preset voltage. In the present embodiment, if the deformation sensor 28 is reliable, the output voltage of the detection terminal 282 should be less than or equal to the second preset voltage. If the output voltage of the detection terminal 282 is greater than the second preset voltage, a failure of the deformation sensor 28, such as an open circuit fault, is indicated. If the output voltage of the detection terminal 282 is less than or equal to the second preset voltage, the deformation sensor 45 is indicated to be reliable, and it is then determined whether the cell assembly 24 is deformed. The controller 29 obtains the output signal of the detection terminal 282 to determine whether the parameter related to the deformation amount of the battery cell assembly 24 meets the first preset condition, and cuts off the electrical connection between the battery cell assembly 24 and the battery pack interface 21 when the output signal of the detection terminal 282 meets the first preset condition. Specifically, the controller 29 determines whether the cell assembly 41 is deformed by detecting whether the output voltage of the terminal 282 is less than or equal to a first preset voltage. Wherein the first preset voltage is smaller than the second preset voltage.
In other embodiments, as shown in fig. 8, the switch of the battery pack protection circuit is disposed within the power tool system, specifically on the discharge circuit. In the present embodiment, the battery cell assembly 24, the battery pack interface 21, the tool interface 12, and the motor 111 of the power tool 10 constitute a discharge circuit. The switch 291 is used at least for turning on or off the electrical connection of the battery pack 20 and the motor 111 of the power tool 10. Specifically, the switch 291 is provided in the electric power tool 10, and the controller 29 transmits a control signal to turn off the switch 291 via the communication terminal of the battery pack 20. The controller 29 is configured to output a control signal to turn off the switch 291 to shut off the discharge circuit when the deformation sensor 28 detects that the parameter related to the deformation amount of the battery cell assembly 24 satisfies the first preset condition through the detection terminal 282, thereby protecting the safety of the power tool system. It should be noted that, the method for detecting the deformation of the controller 29 and the cell assembly 24 in this embodiment is the same as that of some embodiments described above, and the description thereof will not be repeated here. It is noted that although the present embodiment discloses that the switch is provided in the power tool 10, the switch may also be provided in the battery pack 20 without limitation.
In other embodiments, referring to fig. 9, battery pack 20 and charger 30 form a charging assembly 200. The charger 30 is used to charge the battery pack 20. Illustratively, the charger 30 includes a charging circuit 31 and a dc output interface 32, the charging circuit 31 including an ac input interface 311 and an ac-dc conversion circuit 312. Specifically, ac power input interface 311 is configured to receive ac power, and in some embodiments, the ac power input interface is coupled to a power plug that is plugged into an ac power outlet to receive ac mains power. The value range of the alternating current accessed by the alternating current input interface 311 is 110V-130V or 210V-230V. The ac/dc conversion circuit 312 is electrically connected to the ac input interface 311 to convert ac power into dc power. The dc output interface 32 is electrically connected to the ac/dc conversion circuit 312 to output dc power.
When the charger 30 charges the battery pack 20, the dc output interface 32 is electrically connected to the battery pack interface 21 to provide power to the battery cell assembly 24. The battery cell assembly 24, the battery pack interface 21, the charging circuit 31, and the dc output interface 32 constitute a charging circuit in which the switch 291 is disposed. Specifically, the switch 291 is provided in the charger 30, and the controller 29 transmits a control signal for turning off the switch 291 to the charger 30 via the communication terminal of the battery pack 20. The controller 29 is configured to output a control signal to turn off the switch 291 to shut off the discharge circuit when the detection terminal 282 of the deformation sensor 28 detects that the parameter related to the deformation amount of the battery cell assembly 24 satisfies the first preset condition, thereby protecting the safety of the power tool system. It should be noted that, the controller 29 and the deformation detection method for the cell assembly 24 in this embodiment are the same as those of the above embodiments, and the description thereof will not be repeated here. It is to be noted that, although the present embodiment discloses that the switch is provided in the charger 30, the switch 291 may be provided in the battery pack 20 without limitation.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be appreciated by persons skilled in the art that the above embodiments are not intended to limit the invention in any way, and that all technical solutions obtained by means of equivalent substitutions or equivalent transformations fall within the scope of the invention.

Claims (13)

1. A battery pack, comprising:
a housing including an upper housing and a lower housing assembled at an interface;
the battery cell assembly comprises a plurality of battery cell units;
a seal positioned at least on one side of the cell assembly to seal the cell assembly;
the deformation sensor is arranged on the surface of the battery cell assembly and used for detecting parameters related to deformation of the battery cell assembly;
the first support plate is positioned on the upper side of the battery cell assembly, and an accommodating space for accommodating the battery cell assembly is formed between the first support plate and the lower shell;
it is characterized in that the method comprises the steps of,
the deformation sensor is at least partially located between the cell assembly and the seal;
the lower surface of the first supporting plate is provided with or connected with a protruding portion, and the protruding portion is located above the deformation sensor and is spaced from the upper surface of the sealing element by a preset distance.
2. The battery pack of claim 1, wherein the battery pack comprises a plurality of battery cells,
further comprises:
the battery pack interface is at least electrically connected with the electric core assembly;
a controller configured to: when the deformation sensor detects that parameters related to the deformation of the battery cell assembly meet a first preset condition, the electric connection between the battery cell assembly and the battery pack interface is cut off.
3. The battery pack of claim 2, wherein the battery pack comprises a plurality of battery cells,
the sealing piece can generate deformation which changes along with the change of the battery cell assembly, and the sealing piece can be propped against the lower surface of the protruding part after being deformed.
4. The battery pack of claim 3, wherein the battery pack comprises a plurality of battery cells,
the deformation sensor includes a first connection line electrically connected to the controller, the first connection line being at least partially located between the first support plate and the seal.
5. The battery pack of claim 1, wherein the battery pack comprises a plurality of battery cells,
the preset distance ranges from greater than or equal to 1 millimeter to less than or equal to 6 millimeters.
6. The battery pack of claim 2, wherein the battery pack comprises a plurality of battery cells,
further comprises:
the alarm is connected with the controller;
the controller is configured to:
and outputting an alarm signal to trigger the alarm to alarm when the deformation sensor detects that the parameter related to the deformation of the battery cell assembly meets a first preset condition.
7. The battery pack of claim 4, wherein the battery pack comprises a plurality of battery cells,
the deformation sensor further comprises a detection terminal, and the detection terminal is electrically connected with the controller through the first connecting wire;
the controller is configured to:
acquiring an output signal of the detection terminal to judge whether the deformation sensor works normally or not; and when the output signal meets a second preset condition, cutting off the electrical connection between the battery cell assembly and the battery pack interface.
8. The battery pack of claim 7, wherein the battery pack comprises a plurality of battery cells,
the controller is configured to:
acquiring an output signal of the detection terminal to judge whether parameters related to the deformation of the battery cell assembly meet a first preset condition or not; and when the output signal meets a first preset condition, cutting off the electrical connection between the battery cell assembly and the battery pack interface.
9. The battery pack of claim 1, wherein the battery pack comprises a plurality of battery cells,
the sealing element is formed around the battery cell component in a glue injection mode.
10. A power tool system comprising:
the electric tool comprises an output shaft and a motor for driving the output shaft to rotate;
a battery pack for providing electric power to the electric tool;
the battery pack includes:
a housing including an upper housing and a lower housing assembled at an interface;
the battery cell assembly comprises a plurality of battery cell units;
a seal positioned at least on one side of the cell assembly to seal the cell assembly;
the battery pack interface is electrically connected with the electric core assembly and is connected with the electric tool to provide electric energy for the electric tool;
the battery cell assembly, the battery pack interface and the motor form a discharging loop, and the motor consumes the electric energy of the battery cell assembly;
the deformation sensor is arranged on the surface of the battery cell assembly and used for detecting parameters related to deformation of the battery cell assembly;
the first support plate is positioned on the upper side of the lower shell, and an accommodating space for accommodating the battery cell assembly is formed between the first support plate and the lower shell;
it is characterized in that the method comprises the steps of,
the deformation sensor is located at least partially between the cell assembly and the seal,
the lower surface of the first supporting plate is provided with or connected with a protruding portion, and the protruding portion is located above the deformation sensor and is spaced from the upper surface of the sealing element by a preset distance.
11. The power tool system of claim 10, wherein,
further comprises:
a switch disposed on the discharge loop;
a controller configured to:
when the deformation sensor detects that the parameters related to the deformation of the battery cell assembly meet a first preset condition, a control signal for enabling the switch to be disconnected is output so as to cut off the discharge loop.
12. A charging assembly comprising:
a charger including a charging circuit;
a battery pack for providing electric power to the electric tool;
the battery pack includes:
a housing including an upper housing and a lower housing assembled at an interface;
the battery cell assembly comprises a plurality of battery cell units;
a seal positioned at least on one side of the cell assembly to seal the cell assembly;
the battery pack interface is electrically connected with the battery cell assembly and is connected with the charging circuit to provide electric energy for the battery cell assembly;
the battery cell assembly, the battery pack interface and the charging circuit form a charging loop;
the deformation sensor is arranged on the surface of the battery cell assembly and used for detecting parameters related to deformation of the battery cell assembly;
the first support plate is positioned on the upper side of the lower shell, and an accommodating space for accommodating the battery cell assembly is formed between the first support plate and the lower shell;
it is characterized in that the method comprises the steps of,
the deformation sensor is located at least partially between the cell assembly and the seal,
the lower surface of the first supporting plate is provided with or connected with a protruding portion, and the protruding portion is located above the deformation sensor and is spaced from the upper surface of the sealing element by a preset distance.
13. The charging assembly of claim 12, wherein the battery is electrically connected to the battery,
further comprises:
a switch disposed on the charging circuit;
a controller configured to:
when the deformation sensor detects that the parameters related to the deformation of the battery cell assembly meet a first preset condition, a control signal for enabling the switch to be disconnected is output so as to cut off the charging loop.
CN202111327581.6A 2021-11-10 2021-11-10 Battery pack, electric tool system and charging combination Pending CN116111262A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111327581.6A CN116111262A (en) 2021-11-10 2021-11-10 Battery pack, electric tool system and charging combination

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111327581.6A CN116111262A (en) 2021-11-10 2021-11-10 Battery pack, electric tool system and charging combination

Publications (1)

Publication Number Publication Date
CN116111262A true CN116111262A (en) 2023-05-12

Family

ID=86264270

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111327581.6A Pending CN116111262A (en) 2021-11-10 2021-11-10 Battery pack, electric tool system and charging combination

Country Status (1)

Country Link
CN (1) CN116111262A (en)

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