CN114792849B - Battery packs, power tool systems and charging kits - Google Patents
Battery packs, power tool systems and charging kitsInfo
- Publication number
- CN114792849B CN114792849B CN202111533261.6A CN202111533261A CN114792849B CN 114792849 B CN114792849 B CN 114792849B CN 202111533261 A CN202111533261 A CN 202111533261A CN 114792849 B CN114792849 B CN 114792849B
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- China
- Prior art keywords
- battery pack
- cell assembly
- battery
- battery cell
- deformation
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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
- 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
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
-
- 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
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
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- 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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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Battery Mounting, Suspending (AREA)
Abstract
本发明公开了一种电池包、电动工具系统及充电组合，包括：壳体；电芯组件；电芯组件包括多个非圆柱型电芯单元；电芯单元层叠排布；电芯弹性件，位于所述电芯组件的至少一侧以保护所述电芯组件；电池包接口，至少与电芯组件之间电性连接；开关，连接在电芯组件和电池包接口之间；形变传感器，位于电芯弹性件的一侧，用于检测与电芯组件的形变量相关的参数；控制器，被配置为：在传感器检测到电芯组件与形变量相关的参数满足预设条件时输出使开关断开的控制信号以切断电芯组件和电池包接口之间的电性连接。采用以上技术方案，能够降低因电池包的内部形变导致爆炸的安全隐患，提高电池包的安全性和可靠性。
The present invention discloses a battery pack, an electric tool system, and a charging assembly, comprising: a housing; a battery cell assembly; the battery cell assembly comprising a plurality of non-cylindrical battery cell units; the battery cell units being arranged in a stacked manner; a battery cell elastic member located on at least one side of the battery cell assembly to protect the battery cell assembly; a battery pack interface electrically connected to at least the battery cell assembly; a switch connected between the battery cell assembly and the battery pack interface; a deformation sensor located on one side of the battery cell elastic member for detecting parameters related to the deformation of the battery cell assembly; and a controller configured to output a control signal to disconnect the switch to cut off the electrical connection between the battery cell assembly and the battery pack interface when the sensor detects that the parameters related to the deformation of the battery cell assembly meet a preset condition. The above technical solution can reduce the safety hazard of explosion caused by internal deformation of the battery pack and improve the safety and reliability of the battery pack.
Description
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 can generate a small amount of gas in the battery due to evaporation of lithium ion electrolyte in the charging process, and the gas can be absorbed when the battery is discharged under normal conditions, however, the gas generation can be aggravated due to too large charge and discharge current caused by long-time charging, so that the internal pressure of the battery is increased, and the expansion phenomenon of the battery is caused. 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. At the same time, in the worst case, combustible gases such as electrolyte or broken materials may be discharged outwards, which may lead to fires or explosions.
Therefore, in a power tool powered by a battery pack, there is a safety hazard of explosion caused by the expansion deformation of the battery pack.
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 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 comprises a shell, a battery cell assembly, a battery cell elastic piece, a battery pack interface, a switch, a deformation sensor and a controller, wherein the shell comprises an upper shell and a lower shell which are assembled at an interface to form an inner cavity, the battery cell assembly is arranged in the inner cavity, the battery cell assembly comprises a plurality of non-cylindrical battery cell units, the battery cell units are arranged in a stacked mode, the battery cell elastic piece is arranged around the battery cell assembly to seal the battery cell assembly, the battery pack interface is at least electrically connected with the battery cell assembly, the switch is connected between the battery cell assembly and the battery pack interface, the deformation sensor is arranged on one side of the battery cell elastic piece and used for detecting parameters related to deformation of the battery cell assembly, and the controller is configured to output a control signal for enabling the switch to be disconnected to cut off the electrical connection between the battery cell assembly and the battery pack interface when the sensor detects that the parameters related to deformation of the battery cell assembly meet preset conditions.
Optionally, the sensor is located on the upper side of the cell elastic piece and has a preset distance from the upper surface of the cell elastic piece.
Optionally, the preset distance ranges from greater than or equal to 1 millimeter to less than or equal to 6 millimeters.
Optionally, the sensor comprises a first support plate and a sensor, wherein the first support plate is positioned on the upper side of the lower shell, an accommodating space for accommodating the battery cell assembly is formed between the first support plate and the lower shell, and the sensor is arranged on the lower surface of the first support plate.
Optionally, the sensor comprises a second supporting plate, wherein the second supporting plate comprises an elastic plate with a certain elastic coefficient, and the elastic plate is arranged between the battery cell assembly and the first supporting plate and is used for supporting the sensor.
Optionally, the second support plate is fixedly connected with the lower housing through an elastic arm.
Optionally, the controller is connected with the controller and is configured to output an alarm signal to trigger the alarm when the sensor detects that the parameters related to the deformation of the battery cell assembly meet preset conditions.
Optionally, the sensor comprises a detection terminal, the controller is configured to acquire the voltage of the detection terminal, and when the voltage is smaller than or equal to a first preset voltage, a control signal for enabling the switch to be disconnected is output to cut off the electrical connection between the battery cell assembly and the battery pack interface.
Optionally, the sensor comprises a detection terminal, the controller is configured to acquire the voltage of the detection terminal, and output a control signal for enabling the switch to be opened when the voltage is larger than a second preset voltage so as to cut off the electrical connection between the battery cell assembly and the battery pack interface.
Optionally, the cell elastic member is formed around the cell assembly in a glue injection manner.
A power tool system comprises a power tool, a battery pack, a sensor, a switch and a controller, wherein the power tool comprises a functional piece and a motor for driving the functional piece to act, the battery pack is used for providing electric energy for the power tool, the battery pack comprises a shell, the shell comprises an upper shell and a lower shell which are assembled at an interface to form an inner cavity, the battery pack is arranged in the inner cavity, the battery pack comprises a plurality of non-cylindrical battery cells, the battery cells are arranged in a stacked mode, the battery pack elastic piece is arranged around the battery pack to seal the battery pack, the battery pack interface is electrically connected with the battery pack and connected with the power tool to provide electric energy for the power tool, the battery pack, the motor form a discharging loop, the motor consumes the electric energy of the battery pack, the sensor is located on one side of the battery pack elastic piece and used for detecting parameters related to deformation quantity of the battery pack, the switch is arranged on the discharging loop, and the controller is configured to enable the battery pack to control the discharging loop to be disconnected when the sensor detects that the parameters related to the deformation quantity of the battery pack meet preset parameters.
A charging assembly comprises a charger, a battery pack and a controller, wherein the charger comprises a charging circuit, the battery pack is used for providing electric energy for an electric tool, the battery pack comprises a shell, the shell comprises an upper shell and a lower shell which are assembled at an interface to form an inner cavity, a battery cell assembly is arranged in the inner cavity, the battery cell assembly comprises a plurality of non-cylindrical battery cell units, the battery cell units are arranged in a stacked mode, a battery cell elastic piece is arranged around the battery cell assembly to seal the battery cell assembly, a 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 pack interface and the charging circuit form a charging loop, a sensor is arranged on one side of the battery cell elastic piece and used for detecting parameters related to deformation of the battery cell assembly, the charging assembly further comprises a switch and the controller is arranged on the charging loop and is configured to output a control signal which enables the switch to be disconnected when the sensor detects that the parameters related to the battery cell assembly and the deformation amount meet preset conditions 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 according to a first embodiment;
FIG. 2 is a perspective view of the power tool of FIG. 1;
fig. 3 is a structural view of a battery pack provided in the first embodiment;
Fig. 4 is a schematic view of the structure of the battery pack shown in fig. 3 with the upper case removed;
FIG. 5 is a schematic view of the internal structure of the battery pack removal housing and the cell spring shown in FIG. 3;
FIG. 6 is a schematic view of the internal structure of the cell assembly of FIG. 3 including a portion of the cell spring;
Fig. 7 is a schematic view showing an internal structure between the lower housing and the first support plate according to the first embodiment;
fig. 8 is a schematic view showing an internal structure between the lower housing and the first support plate according to the second embodiment;
Fig. 9 is a block diagram of a protection circuit for a battery pack according to the first embodiment;
fig. 10 is a block diagram of a protection circuit for a battery pack according to the second embodiment;
FIG. 11 is a block diagram of a protection circuit for a power tool system according to the first embodiment;
fig. 12 is a block diagram of a protection circuit for a charging combination according to the first 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 tools for lawnmowers, pruners, blowers, chainsaws, etc., torque output tools for drills, hammers, etc., saw tools for circular saws, curved saws, reciprocating saws, etc., and grinding tools for angle grinders, sanders, etc.
Referring to fig. 2, the 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.
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, and 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. Further, the power tool 10 is further provided with a tool interface 12 and a tool engaging portion 13 at a lower end of the handgrip 114 for detachable connection with the 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.
In the following description, the vertical front-rear direction will be described with reference to the direction shown in fig. 3.
Referring to fig. 3 to 5, the battery pack 20 includes a housing 23, a battery cell assembly 24, a battery pack coupling part 22, and a battery pack interface 21. 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 a charger to enable the charger to charge the battery pack 20. The battery pack coupling portion 22 can be removably coupled to the tool engagement portion 13 or the charger to enable the battery pack 20 to power the power tool 10 or the charger to charge the battery cell assembly 24.
The housing 23 includes an upper housing 231 and a lower housing 232 assembled at the interface to form an inner cavity, and the inner cavity formed by the assembly of the upper housing 231 and the lower housing 232 serves to fix and house 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 241 includes a battery cell tab 242, and the battery cell tab 242 further includes a battery cell anode 2421 and a battery cell cathode 2422, for outputting electric energy of the battery cell 241 or inputting electric energy to charge the battery cell 241. The battery cell assembly 24 further includes a battery cell assembly positive terminal and a battery cell assembly negative terminal for outputting electrical energy from the battery cell assembly 24 or inputting electrical energy to charge the battery cell assembly 24. The battery cell assembly positive terminal is connected in series between at least one battery cell unit positive electrode and the battery pack positive terminal, and the battery cell assembly negative terminal is connected in series between at least one battery cell unit negative electrode and the battery pack negative terminal. 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 comprises a battery cell 241 casing, wherein a cylindrical battery generally adopts a steel shell as the battery cell 241 casing, and a soft package battery generally adopts an aluminum plastic film as the battery cell 241 casing. It is to be understood that the application is not limited to the disclosed embodiments, but is not limited to the structure of the cell 241.
The battery pack interface 21 is formed on an upper surface of the housing 23, and is electrically connected to at least the battery cell assembly 24 for establishing physical and electrical connection with the power tool, and in particular, the battery pack interface 21 is formed on an upper surface of the upper housing 231. In some embodiments, the battery pack interface 21 includes a positive power interface 211, a negative power interface 212, and a communication power interface 213. The battery pack 20 outputs electric power through the power positive interface 211 and the power negative interface 212, and the battery pack 20 communicates with an attached electric tool or charger through the power communication interface 213. In a specific embodiment, the housing is provided with 2 positive power interfaces 211 and 2 negative power interfaces 212, it being understood that the housing 23 may be provided with more or less positive power interfaces 211 and 212 depending on the electrical characteristics of the battery pack.
The battery pack also includes a first support plate 25, a main circuit board 26, and a terminal assembly 27.
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 24. Similarly, the first support plate 25 and the upper housing 231 also form an accommodating space for accommodating the main circuit board 26, the terminal assembly 27, and the like. Specifically, the first support plate 25 has a flat plate-like structure.
The terminal assembly 27 includes a plurality of battery pack terminals and a terminal support 271. Wherein, the terminal support stand 271 is used for accommodating and fixing a plurality of battery pack terminals to the first support plate 25. The plurality of battery pack terminals further includes a battery pack positive terminal 272, a battery pack negative terminal 273, and a battery pack communication terminal 274. The battery pack positive terminal 272 is electrically connected to the battery cell assembly positive terminal, i.e., at least one battery cell positive electrode, which is located in the power supply positive interface 211, and the battery pack negative terminal 273 is electrically connected to the battery cell assembly negative terminal, i.e., at least one battery cell negative electrode, which is located in the power supply negative interface 212. The battery pack positive terminal 272 and the battery pack negative terminal 273 are configured to cooperate with the tool terminals of the power tool 10 to output the electrical energy of the battery cell assembly 24 to the power tool 10, specifically, the electrical energy of the battery cell assembly 24 passes through the battery cell assembly positive terminal and the battery pack positive terminal 272 to the tool interface 12 and the motor 111 of the power tool, and then passes through the battery pack negative terminal 273 and the battery cell assembly negative terminal to return to the battery cell assembly 24, so that the battery cell assembly 24, the plurality of battery pack terminals in the battery pack interface and the motor 111 of the power tool form a discharge circuit, and the motor 111 consumes the electrical energy of the battery cell assembly 24 through the discharge circuit. In addition, a battery pack communication terminal 274 is located in the power communication interface 213 for communicating with the power tool 10 or the charger being accessed. As a specific embodiment, the battery pack terminals are inserted into the battery pack terminals by sandwiching the tool terminals respectively with elastic force from both sides in the left-right direction, and therefore, the tool terminals of the power tool are guided by the battery pack interface during the process of mounting the battery pack to the power tool, so that the tool terminals are sandwiched by the battery pack terminals, thereby electrically connecting the power tool 10 with the battery pack 20.
The main circuit board 26 is disposed on the upper side of the first support plate 25, and is connected in series between the battery cell assembly 24 and the battery pack interface 21, for collecting electrical signals related to the battery pack 20. In some embodiments, the main circuit board 26 is connected in series between the battery cell assembly 24 and the battery pack communication terminal 274 for transmitting battery pack information through the battery pack communication terminal 274 to the power tool 10 attached to the battery pack 20. The battery pack information includes a discharge current of the battery pack, a temperature of the battery cell assembly 24 and/or the battery cell 241, a voltage of the battery cell 241, an internal resistance value of the battery cell 241, and the like. Typically, the battery pack information is detected by a sensor, so the battery pack 20 also includes a detection sensor. The number of detection sensors may be one or more. In some embodiments, the detection sensor may be a temperature sensor, which is disposed on a surface of the cell assembly 24 or a surface of the cell unit 241, and the temperature sensor may be a thermistor in particular. The detection sensor may also be a voltage sensor for detecting the voltage of the battery cell 241.
Referring to fig. 5, the battery pack 20 further includes a detection circuit board 28, and the detection sensor is integrated on the detection circuit board 28, and for convenience of detection, the detection circuit board 28 is disposed on a side of the cell assembly where the cell tab 242 is located, that is, on a side of the cell assembly 24 where the cell positive electrode 2421 and the cell negative electrode 2422 are located. It will be appreciated that the battery pack 20 also includes other types of sensors such that the detection circuit board 28 can collect battery pack information via the various sensors while communicating the collected battery pack information to the main circuit board 26 and to the attached power tool 10 or charger via the battery pack communication terminal 274. In some embodiments, the cell tabs 242, i.e., the cell positive electrode 2421 and the cell negative electrode 2422, are disposed on the front or back end face of the cell 241.
Referring to fig. 6, the battery pack 20 further includes a cell elastic member 201, and the cell elastic member 201 is positioned at least one side of the cell assembly 24 to protect the 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 cell elastic member 201 is disposed around the cell assembly 24, that is, the cell elastic member 201 is disposed around the upper surface, the lower surface, the front end surface, the rear end surface, the left side surface, and the right side surface of the cell assembly 24 to seal the cell assembly 24 for waterproof, dustproof, and the like functions. In other embodiments, the cell elastic pieces 201 are disposed at two ends of the cell assembly, and at least part of the cell elastic pieces 201 encapsulate the tab, so as to fix the tab in a wrapping manner. In this way, the cell elastic member 201 is used to protect the cell assembly 24 from possible relative displacement between the cell units 241 due to jolt or vibration, thereby avoiding the occurrence of extrusion or kinking of the cell units 241 or tabs. Therefore, the battery cell elastic piece 201 can improve the anti-falling shock absorption performance of the battery pack 20, further improve the reliability of the battery pack 20, and the battery cell elastic piece 201 is an elastic piece and can better adapt to the expansion property of the battery pack 20. Furthermore, the cell elastic member 201 can also improve the heat dissipation performance of the battery pack 20.
In some embodiments, the cell spring 201 encases and secures the cell assembly 24 and the detection circuit board 28, as well as other connection lines. In order to enable the battery cell assembly 24 to output or input electric power, the positive electrode lead-out tab 243 and the negative electrode lead-out tab 244 of the battery cell assembly 24 extend from the battery cell elastic member 201 and protrude from the battery cell elastic member 201, and are electrically connected to the battery pack positive electrode terminal 272 and the battery pack negative electrode terminal 273, respectively. In some embodiments, the cell elastic member 201 is formed around the cell assembly 24 by way of glue injection. Specifically, the battery cell assembly 24 is placed in the lower housing 232, and the battery cell elastic member 201 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.
Referring to fig. 7, the battery pack 20 further includes a deformation sensor 202, and the deformation sensor 202 is disposed on one side of the cell elastic member 201 and is used for detecting parameters related to the deformation amount of the cell assembly 24. Specifically, the deformation sensor 202 is located on the upper side of the cell elastic member 201 and is spaced apart from the upper surface of the cell elastic member 201 by a predetermined distance. The deformation sensor 202 is disposed between the cell elastic member 201 and the first support plate 25, and in some embodiments, the deformation sensor 202 is specifically disposed on the lower surface of the first support plate 25 and is spaced from the upper surface of the cell elastic member 201 by 1 to 6 millimeters, i.e., the preset distance ranges from greater than or equal to 1 millimeter to less than or equal to 6 millimeters.
In this embodiment, the deformation sensor 202 is connected to the main circuit board 26 through a first connection line 203 to output a sensing signal of the deformation sensor 202 to the main circuit board 26. As an embodiment, the deformation sensor 202 is a pressure sensor, and the deformation sensor 202 is capable of outputting a sensing signal when receiving pressure. Specifically, as shown in fig. 5, when the cell assembly 24 is deformed, for example, the cell assembly 24 expands to increase the first thickness H1, the cell elastic member 201 is deformed to be protruded upward to contact the deformation sensor 202, and the deformation sensor 202 senses the pressure from the cell elastic member 201 to output a sensing signal and transmits the sensing signal to the main circuit board 26 through the first connection line. In this way, the deformation sensor 202 and the first connecting line are arranged outside the cell elastic piece 201, so that maintenance and replacement are convenient when the deformation sensor 202 fails.
On the one hand, since the battery cell assembly 24 has a certain deformation during normal operation, the deformation sensor 202 and the battery cell elastic member 201 are reserved with a preset distance, so that the deformation of the battery cell assembly 24 during normal operation can be ensured, thereby improving the reliability of the deformation sensor 202 and reducing the probability of false triggering. On the other hand, since the cell elastic member 201 surrounds the cell assembly 24 to form a closed cavity, the temperature change during the operation of the battery pack may cause the air expansion in the closed cavity, and the air pressure in the closed cavity is increased, so that the deformation sensor 202 is arranged outside the cell elastic member 201, the influence of the closed cavity formed by the cell elastic member 201 on the deformation detection of the cell assembly 24 can be avoided, the reliability of the deformation sensor 202 is also improved, and the safety and reliability of the battery pack are further improved. In addition, the first support plate 25 is disposed between the battery cell assembly 24 and the main circuit board 26, so that even if the battery cell assembly 24 deforms, the first support plate 25 can effectively block the deformation of the battery cell assembly 24, protect the main circuit board 26, and prevent the deformation of the battery cell assembly 24 from damaging the main circuit board 26.
In other embodiments, referring to fig. 8, the battery pack 20 further includes a second support plate 204, and the second support plate 204 includes an elastic plate having a certain elastic coefficient. A second support plate 204 is arranged between the cell assembly 24 and the first support plate 25 for supporting the deformation sensor 202. In this embodiment, the second support plate 204 is fixedly connected to the lower housing 232 through an elastic arm having a certain elastic coefficient, and the second support plate 204 further includes a plurality of elastic arms detachably connected to the lower housing 232 through screws. It is understood that the second support plate 204 may be made of an elastic material, so long as it can deform as the cell assembly 24 deforms, which is not limited herein. Specifically, the deformation sensor 202 is disposed on the upper surface of the second support plate 204 and spaced 1-6 mm from the upper surface of the cell elastic member 201 covering the outer surface of the cell assembly 24.
In this embodiment, the deformation sensor 202 is connected to the detection circuit board 28 through the second connection line 205 to output the sensing signal of the deformation sensor 202 to the detection circuit board 28. Specifically, when the cell assembly 24 deforms, for example, the cell assembly 24 expands to increase the first thickness H1, the cell elastic member 201 deforms to be raised upwards to contact with the second support plate 204, and the deformation sensor 202 disposed on the second support plate 204 also protrudes upwards to contact with the first support plate 25, so that the deformation sensor 202 senses the pressure from the first support plate 25 and the second support plate 204 to output a sensing signal, and transmits the sensing signal to the detection circuit board 28 through the second connection wire 205, and the detection circuit board 28 collects the sensing signal and transmits the sensing signal to the main circuit board 26. The specific shapes of the first and second connection lines 203 and 205 may be set according to the specific structure of the battery pack, and are not limited herein.
Fig. 9 shows a block diagram of a protection circuit of the battery pack. As shown in fig. 9, the battery pack protection circuit 30 includes a battery cell assembly 31, a switch 32, a controller 33, a battery pack positive terminal 341, a battery pack negative terminal 342, and a deformation sensor 33. Wherein, the battery pack positive terminal 341 and the battery pack negative terminal 342 are disposed in the battery pack interface 34, and the battery cell assembly 31 further includes the battery cell assembly positive terminal 311 and the battery cell assembly negative terminal 312.
The switch 32 is connected between the battery cell assembly 31 and the battery pack interface 34, and is used for switching on or switching off the electrical connection between the battery cell assembly 31 and the battery pack interface 34. The on and off of the switch 32 is controlled by a controller 33. In some embodiments, the switch is disposed between the cell assembly positive terminal 311 and the battery pack positive terminal 341, and in other embodiments, the switch is disposed between the cell assembly negative terminal 312 and the battery pack negative terminal 342. Specifically, the switch 32 is disposed on a circuit board, and the switch 32 may be a metal oxide semiconductor transistor, or may be an electronic switch such as an insulated gate bipolar transistor or a relay.
The controller 33 is connected to the deformation sensor 35, and is configured to output a control signal for opening the switch 32 to cut off the electrical connection between the battery cell assembly 31 and the battery pack interface 34 when the deformation sensor 35 detects that the parameter related to the deformation amount of the battery cell assembly 31 meets a preset condition. Wherein, deformation sensor 35 includes at least detection terminal 351, and detection terminal 351 and controller 33 are connected. In some embodiments, the parameter related to the deformation of the deformation sensor 35 and the battery cell assembly 31 is a voltage parameter, specifically, the output voltage of the detection terminal 351 is continuously changed along with the pressure change of the deformation sensor 35 after the deformation sensor 35 is powered on. Therefore, the controller 33 is specifically configured to obtain the voltage of the detection terminal 351, and output a control signal for opening the switch 32 to disconnect the electrical connection between the battery cell assembly 31 and the battery pack interface 34 when the voltage of the detection terminal 351 is less than or equal to a first preset voltage. In this embodiment, since the resistance of the deformation sensor 35 decreases as the pressure applied to the battery pack 31 is gradually increased due to continuous deformation, the voltage of the detection terminal 351 is continuously decreased as the pressure applied to the deformation sensor 35 is increased until the voltage is reduced to the first preset voltage, and the controller 33 determines that the battery pack 31 is deformed at this time to disconnect the switch 32, so that the electrical connection between the battery pack interface 21 and the battery pack 31 is cut off, and the safety of the battery pack is protected. 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 parameters related to the deformation amount of the cell assembly 31 acquired by the controller 33 may also be a resistance value, a current value, an inductance value, or the like according to the selected deformation sensor 35, which is not limited herein. It is understood that the present application is not limited to the disclosed embodiments, and the preset conditions for controlling the on/off of the switch 321 may be different depending on the specific circuit of the deformation sensor 35 by the controller 33. For example, the controller 33 may be further configured to output a control signal for turning off the switch 32 to cut off the electrical connection between the battery cell assembly 31 and the battery pack interface 21 when the voltage of the detection terminal 351 is equal to or greater than a first preset voltage, so as to protect the battery pack.
In other embodiments, referring to fig. 10, the battery pack protection circuit 40 includes an alarm 46, the alarm 46 being capable of being triggered to alarm. The controller 43 is configured to output an alarm signal to trigger the alarm 46 to alarm when the deformation sensor 45 detects that the parameter related to the deformation of the cell assembly 41 meets a preset condition. The deformation sensor 45 at least includes a detection terminal 451, the detection terminal 451 is connected to the controller 43, and the controller 43 is specifically configured to obtain a voltage of the detection terminal 451, and output an alarm signal to trigger the alarm 46 to alarm when the voltage is less than or equal to a first preset voltage. In this embodiment, since the resistance of the deformation sensor 45 decreases as the pressure applied to the battery cell assembly 41 continuously deforms gradually increases, the voltage of the detection terminal 451 continuously decreases as the pressure applied to the deformation sensor 45 increases until the voltage decreases to the first preset voltage, and the controller 43 determines that the battery cell assembly 41 is deformed at this time to send an alarm signal to trigger the alarm 46 to alarm. The alarm 46 may specifically be a buzzer, and the buzzer is triggered to alarm and then buzzes to remind a user that the battery pack has a potential safety hazard currently. The alarm 46 may also be other electronic devices, such as an LED lamp, which can be triggered to flash to alert the user that the cell assembly 41 is deformed and that a safety hazard exists.
In order to further improve the reliability of the deformation sensor 45, the controller 43 needs to determine whether the deformation sensor 45 is reliable before determining whether the cell assembly 41 is deformed. Accordingly, the controller 43 is configured to acquire the voltage of the detection terminal 451, and output a control signal to turn off the switch to cut off the electrical connection between the battery pack interface 44 and the battery module 41 when the voltage is greater than a second preset voltage. In this embodiment, if the deformation sensor 45 is reliable, the voltage should be less than or equal to the second preset voltage, and if the voltage of the detection terminal 451 is greater than the second preset voltage, it indicates that the deformation sensor 45 is open, thereby judging that the deformation sensor 45 fails. To ensure the safety of the battery pack, the controller 43 turns off the switch, thereby cutting off the electrical connection between the battery cell assembly 41 and the battery pack interface 44. On the contrary, if the voltage of the detection terminal 451 is less than or equal to the second preset voltage, the deformation sensor 45 is indicated to be reliable, and whether the voltage is less than or equal to the first preset voltage is continuously determined to determine whether the cell assembly 41 is deformed. Wherein the first preset voltage is smaller than the second preset voltage.
In other embodiments, the switch of the battery pack protection circuit is disposed within the power tool system, and in particular, on the discharge circuit. Fig. 11 shows a block diagram of a protection circuit of an electric tool system of an embodiment, and referring to fig. 11, the electric tool system includes an electric tool 50 and a battery pack 60. The battery pack 60 is attached to the power tool 50, and the battery pack positive terminal 641 and the battery pack negative terminal 642 cooperate with the power tool positive terminal 531 and the power tool negative terminal 532 to output the power of the battery pack 61 to the power tool 50, and the battery pack communication terminal and the power tool communication terminal are connected to communicate with the power tool. In the present embodiment, the switch 51 is disposed on a discharging circuit formed by the battery pack 61, the battery pack interface 64, and the motor 52 of the electric tool, and is used at least for turning on or off the electrical connection between the battery pack and the motor 52 of the electric tool. The on and off of the switch 51 is also controlled by the controller 63, and specifically, the controller 63 transmits a control signal for turning off the switch 51 through the battery pack communication terminal. The controller 63 is configured to output a control signal to turn off the switch 51 to cut off the discharge circuit when the deformation sensor 62 detects that the parameter of the battery cell assembly 61 related to the deformation amount satisfies a preset condition, thereby protecting the safety of the power tool system. The deformation sensor 62 includes at least a detection terminal 621, the detection terminal 621 is connected to the controller 63, and the controller 63 is specifically configured to obtain a voltage of the detection terminal 621, and output a control signal for turning off the switch 51 to cut off the discharge circuit when the voltage is less than or equal to a first preset voltage. Since the resistance of the deformation sensor 62 decreases as the pressure applied to the battery cell assembly 61 is gradually increased due to continuous deformation, the voltage of the detection terminal 621 decreases as the pressure applied to the deformation sensor 62 is increased until the voltage decreases to the first preset voltage, and the controller 63 determines that the battery cell assembly 61 is deformed at this time to disconnect the switch 51, thereby cutting off the discharge circuit and protecting the safety of the battery pack. It is to be noted that, although the present embodiment discloses that the switch 51 is provided in the electric tool, the switch 51 may be provided in a battery pack without limitation.
In order to further improve the reliability controller 63 of the deformation sensor 62, it is determined whether the deformation sensor 62 is reliable before determining whether the cell assembly 61 is deformed. The controller 63 is configured to acquire the voltage of the detection terminal 621, and output a control signal to turn off the switch 51 to cut off the discharge circuit when the voltage is greater than a second preset voltage. In this embodiment, if the deformation sensor 62 is reliable, the voltage should be less than or equal to the second preset voltage, and if the voltage of the detection terminal 621 is greater than the second preset voltage, it indicates that the deformation sensor 62 is open, so as to determine that the deformation sensor 62 is failed, and in order to ensure the safety of the battery pack, the controller 63 opens the switch 51, so as to cut off the discharge circuit. Otherwise, if the voltage of the detection terminal 621 is less than or equal to the second preset voltage, the deformation sensor 62 is indicated to be reliable, and whether the voltage is less than or equal to the first preset voltage is continuously determined to determine whether the cell assembly 61 is deformed. Wherein the first preset voltage is smaller than the second preset voltage.
Fig. 12 shows a block diagram of a protection circuit for a charging assembly including a battery pack 60 and a charger 80, as shown with reference to fig. 12, according to one embodiment.
The charger 80 is used to charge the battery pack. Illustratively, the charger 80 includes a charging circuit 82 and a dc output interface 83, the charging circuit 82 including an ac input interface and an ac-dc conversion circuit. Specifically, the ac input interface is configured to receive ac power, and in some embodiments, the ac input interface is coupled to a power plug that is plugged into an ac outlet to receive ac mains power. The value range of the alternating current accessed by the alternating current input interface is 110V-130V or 210V-230V. The ac/dc conversion circuit is electrically connected to the ac input interface to convert ac to dc, and the dc output interface 83 is electrically connected to the ac/dc conversion circuit to output dc. The dc output interface 83 also includes a charger positive terminal 831 and a charger negative terminal 832. The charger positive terminal 831 and the charger negative terminal 832 cooperate with the battery pack positive terminal 641 and the battery pack negative terminal 642 to provide electrical power to the battery pack 61, and the charger communication terminal 833 and the battery pack communication terminal 643 are connected to communicate with the battery pack. In the present embodiment, the switch 81 is disposed on the charging circuit formed by the battery module 61, the battery pack interface 64 and the charging circuit 82, and is at least used for turning on or off the electrical connection between the battery pack and the charging circuit 82. The on and off of the switch is also controlled by the controller 63, and specifically, the controller 63 transmits a control signal for turning the switch off through the battery pack communication terminal. The controller 63 is configured to output a control signal for opening the switch to cut off the charging loop when the deformation sensor 62 detects that the parameter related to the deformation amount of the battery cell assembly 61 meets a preset condition, so as to protect the safety of the charging combination. The deformation sensor 62 includes at least a detection terminal 621, the detection terminal 621 is connected to the controller 63, and the controller 63 is specifically configured to obtain a voltage of the detection terminal 621, and output a control signal for turning off the switch 81 to cut off the charging circuit when the voltage is less than or equal to a first preset voltage. Since the resistance of the deformation sensor 62 decreases with the increase of the applied pressure, the voltage of the detection terminal 621 decreases continuously with the increase of the applied pressure of the deformation sensor 62 until the voltage decreases to the first preset voltage, and it is determined that the battery module 61 is deformed at this time, and the controller 63 turns off the switch 81, thereby cutting off the charging circuit and protecting the safety of the battery pack. It is noted that although the present embodiment discloses the switch being provided in the charger 80, the switch may also be provided in the battery pack, without limitation.
In order to further improve the reliability controller 63 of the deformation sensor 62, it is determined whether the deformation sensor 62 is reliable before determining whether the cell assembly 61 is deformed. The controller 63 is configured to acquire the voltage of the detection terminal 621, and output a control signal to turn off the switch 81 to cut off the charging circuit when the voltage is greater than a second preset voltage. In this embodiment, if the deformation sensor 62 is reliable, the voltage should be equal to or less than the second preset voltage, and if the voltage of the detection terminal 621 is greater than the second preset voltage, it indicates that the deformation sensor 62 is open, so as to determine that the deformation sensor 62 is failed, and in order to secure the safety of the battery pack, the controller 63 opens the switch 81, so as to cut off the charging circuit. On the contrary, if the voltage of the detection terminal 621 is less than or equal to the second preset voltage, the deformation sensor 62 is indicated to be reliable, and whether the voltage is less than or equal to the first preset voltage is continuously determined to determine whether the cell assembly 61 is deformed. Wherein the first preset voltage is smaller than the second preset voltage.
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 (10)
1. 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 is arranged in the inner cavity and comprises a plurality of non-cylindrical battery cell units, wherein the battery cell units are arranged in a stacked manner;
a cell elastic piece positioned on at least one side of the cell assembly to protect the cell assembly;
The battery pack interface is at least electrically connected with the battery cell assembly;
The switch is connected between the battery cell assembly and the battery pack interface;
The deformation sensor is positioned at one side of the electric core elastic piece and is used for detecting parameters related to the deformation of the electric core assembly;
a controller configured to:
Outputting a control signal for enabling the switch to be disconnected when the deformation sensor detects that parameters related to the deformation of the battery cell assembly meet preset conditions so as to cut off the electrical connection between the battery cell assembly and the battery pack interface;
the cell elastic piece is arranged around the cell assembly to seal the cell assembly;
The deformation sensor is positioned on the upper side of the electric core elastic piece and is spaced with a preset distance from the upper surface of the electric core elastic piece;
The preset distance ranges from greater than or equal to 1 millimeter to less than or equal to 6 millimeters.
2. The battery pack of claim 1, wherein the battery pack comprises a plurality of battery cells,
Comprising the following steps:
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 arranged on the lower surface of the first supporting plate.
3. The battery pack of claim 1, wherein the battery pack comprises a plurality of battery cells,
Comprising the following steps:
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 second support plate comprises an elastic plate with an elastic coefficient, and is arranged between the battery cell assembly and the first support plate and used for supporting the deformation sensor.
4. The battery pack of claim 3, wherein the battery pack comprises a plurality of battery cells,
The second supporting plate is fixedly connected with the lower shell through an elastic arm.
5. The battery pack of claim 1, wherein the battery pack comprises a plurality of battery cells,
Comprising 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.
6. The battery pack of claim 1, wherein the battery pack comprises a plurality of battery cells,
The deformation sensor comprises a detection terminal;
the controller is configured to:
Acquiring the voltage of the detection terminal;
And outputting a control signal for enabling the switch to be disconnected so as to cut off the electrical connection between the battery cell assembly and the battery pack interface when the voltage is smaller than or equal to a first preset voltage.
7. The battery pack of claim 1, wherein the battery pack comprises a plurality of battery cells,
The deformation sensor comprises a detection terminal;
the controller is configured to:
Acquiring the voltage of the detection terminal;
And outputting a control signal for enabling the switch to be disconnected when the voltage is larger than a second preset voltage so as to cut off the electrical connection between the battery cell assembly and the battery pack interface.
8. The battery pack of claim 1, wherein the battery pack comprises a plurality of battery cells,
The cell elastic piece is formed around the cell assembly in a glue injection mode.
9. A power tool system comprising:
The electric tool comprises an output shaft and a motor for driving the output shaft to act;
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 is arranged in the inner cavity and comprises a plurality of non-cylindrical battery cell units, wherein the battery cell units are arranged in a stacked manner;
a cell elastic piece positioned on at least one side of the cell assembly to protect the cell assembly;
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 positioned at one side of the electric core elastic piece and is used for detecting parameters related to the deformation of the electric core assembly;
the power tool system further includes:
a switch disposed on the discharge loop;
a controller configured to:
outputting a control signal for enabling the switch to be disconnected when the deformation sensor detects that parameters related to the deformation of the battery cell assembly meet preset conditions so as to cut off the discharge loop;
the cell elastic piece is arranged around the cell assembly to seal the cell assembly;
the deformation sensor is located on the upper side of the electric core elastic piece and is spaced with the upper surface of the electric core elastic piece by a preset distance, and the preset distance is greater than or equal to 1 millimeter and less than or equal to 6 millimeters.
10. 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 is arranged in the inner cavity and comprises a plurality of non-cylindrical battery cell units, wherein the battery cell units are arranged in a stacked manner;
a cell elastic piece positioned on at least one side of the cell assembly to protect 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 positioned at one side of the electric core elastic piece and is used for detecting parameters related to the deformation of the electric core assembly;
The charging combination further includes:
a switch disposed on the charging circuit;
a controller configured to:
Outputting a control signal for enabling the switch to be disconnected when the deformation sensor detects that parameters related to the deformation of the battery cell assembly meet preset conditions so as to cut off the charging loop;
the cell elastic piece is arranged around the cell assembly to seal the cell assembly;
the deformation sensor is located on the upper side of the electric core elastic piece and is spaced with the upper surface of the electric core elastic piece by a preset distance, and the preset distance is greater than or equal to 1 millimeter and less than or equal to 6 millimeters.
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| WO2025145885A1 (en) * | 2024-01-05 | 2025-07-10 | 南京泉峰科技有限公司 | Power tool system and power tool |
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| CN110350262B (en) * | 2018-04-02 | 2021-03-05 | 南京德朔实业有限公司 | Battery pack and charging combination |
| CN212182401U (en) * | 2020-05-08 | 2020-12-18 | 郑州深澜动力科技有限公司 | Battery module and expansive force detection device thereof |
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