CN112542663A - Battery pack and electric tool adopting same - Google Patents
Battery pack and electric tool adopting same Download PDFInfo
- Publication number
- CN112542663A CN112542663A CN202010976731.5A CN202010976731A CN112542663A CN 112542663 A CN112542663 A CN 112542663A CN 202010976731 A CN202010976731 A CN 202010976731A CN 112542663 A CN112542663 A CN 112542663A
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- battery pack
- current
- protection device
- sheet
- battery
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- 238000001514 detection method Methods 0.000 claims description 28
- 238000004806 packaging method and process Methods 0.000 claims description 6
- 239000008358 core component Substances 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims 1
- 238000004880 explosion Methods 0.000 abstract description 6
- 238000011084 recovery Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 6
- 230000002035 prolonged effect Effects 0.000 description 6
- 238000003466 welding Methods 0.000 description 6
- 238000004891 communication Methods 0.000 description 5
- 230000001681 protective effect Effects 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
Images
Classifications
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- 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
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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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
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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
Abstract
The invention provides a battery pack, which comprises a shell; an electric core assembly disposed within the housing: the cell assembly at least comprises a first sheet-shaped cell and a second sheet-shaped cell, and the second sheet-shaped cell is connected with the first sheet-shaped cell in series; the protection device is connected in series between the first sheet-shaped battery cell and the second sheet-shaped battery cell; the protection device is disconnected when any one of the first sheet-shaped battery cell or the second sheet-shaped battery cell is short-circuited so as to cut off the electrical connection between the first sheet-shaped battery cell and the second sheet-shaped battery cell. The invention provides a battery pack and an electric tool adopting the battery pack, which can reduce the potential safety hazard of fire and explosion of the battery pack caused by short circuit and improve the safety and reliability of the battery pack.
Description
Technical Field
The invention relates to a battery pack and an electric tool adopting the battery pack.
Background
Based on the use requirement of portability, more and more electric tools adopt a battery pack as a power source.
The existing battery pack for supplying power to the electric tool mainly adopts cylindrical lithium cells, and the plurality of cylindrical lithium cells are connected in series and parallel to ensure sufficient electric energy output so as to improve the cruising ability of the electric tool.
In the frequent charging and discharging process of the battery, short circuit can occur, and if the short circuit cannot be terminated timely, the service life of the battery can be greatly influenced. Even when the temperature inside the battery cell rises to a certain degree, accidents such as fire and explosion occur. Therefore, it is necessary to provide a battery pack with higher safety.
Disclosure of Invention
The invention provides a battery pack and an electric tool adopting the battery pack, which can reduce the potential safety hazard of fire and explosion caused by short circuit of a current loop 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 solutions:
a battery pack, comprising: a housing; an electric core assembly disposed within the housing: the electric core component at least comprises: the first sheet-shaped battery cell and the second sheet-shaped battery cell are connected in series; a protection device connected in series between the first sheet-shaped cell and the second sheet-shaped cell; the protection device is disconnected when any one of the first sheet-shaped battery cell or the second sheet-shaped battery cell is short-circuited so as to cut off the electrical connection between the first sheet-shaped battery cell and the second sheet-shaped battery cell.
Preferably, the protection device comprises one of a current fuse, a temperature fuse or a self-healing fuse.
Preferably, the protection device is an electronic switch.
Preferably, the battery pack further includes: the lug is arranged at least one end of the sheet-shaped battery cell and protrudes out of the sheet-shaped battery cell; the battery pack terminal is electrically connected with the lug;
preferably, the battery pack further includes: the current detection device is used for detecting the current of the battery pack terminal; a controller; and the protection piece is configured to output a control signal for disconnecting the protection piece so as to cut off the electrical connection between the first sheet-shaped battery cell and the second sheet-shaped battery cell when the current detection device detects that the current of the battery pack terminal is larger than or equal to a current threshold value.
Preferably, a battery pack includes: a housing; an electrical core assembly disposed within the housing; the battery pack terminal is used for outputting the electric energy of the electric core assembly to supply power for the electric device; wherein, the electric core subassembly includes: the battery comprises a plurality of laminated sheet-shaped battery cells, a plurality of battery cells and a plurality of battery cells, wherein the plurality of sheet-shaped battery cells are connected in series or in parallel; and the protection device is connected in series in a current loop formed by the electric core assembly and the battery pack terminal, and is disconnected when the current loop is short-circuited so as to cut off the current loop.
Preferably, the protection device comprises one of a current fuse, a temperature fuse or a self-healing fuse.
Preferably, the protection device is an electronic switch.
Preferably, the battery pack further includes: the current detection device is used for detecting the current of the battery pack terminal; a controller; and the protection piece is configured to output a control signal for disconnecting the protection piece so as to cut off the electrical connection between the first sheet-shaped battery cell and the second sheet-shaped battery cell when the current detection device detects that the current of the battery pack terminal is larger than or equal to a current threshold value.
Preferably, a battery pack includes: a housing; an electrical core assembly disposed within the housing; the electric core assembly comprises a plurality of sheet-shaped electric cores; the sheet-shaped battery cells are arranged in a laminated manner; the sheet-shaped battery cell comprises a packaging part, and the packaging part is used for packaging the battery cell; the tab is arranged at least one end of the sheet and protrudes out of the battery core; the battery pack terminal is electrically connected with the lug; the current detection device is used for detecting the current of the battery pack terminal; the first protection device is connected between the lug and the battery pack terminal in series; when the current of the battery pack terminal is larger than or equal to a first threshold value, the first protection device is disconnected to cut off the electrical connection between the battery pack terminal and the lug; a second protection device connected in series between the tab and the battery pack terminal; when the current of the battery pack terminal is larger than or equal to a second threshold value, the second protection device is disconnected to cut off the electrical connection between the battery pack terminal and the lug;
preferably, the second threshold is greater than the first threshold.
Preferably, the battery pack further includes: a controller configured to: when the current detection device detects that the current of the battery pack terminal is larger than or equal to a first threshold value, a control signal for disconnecting the first protection device is output to cut off the electric connection between the battery pack terminal and the lug.
Preferably, the second protection device comprises one of a current fuse, a temperature fuse or a self-healing fuse.
Preferably, the first protection device is an IGBT or a MOSFET.
Preferably, a power tool includes a tool body and a battery pack that supplies power to the tool body; the battery pack includes: a housing; an electric core assembly disposed within the housing: the electric core component at least comprises: the first sheet-shaped battery cell and the second sheet-shaped battery cell are connected in series; a protection device connected in series between the first sheet-shaped cell and the second sheet-shaped cell; the protection device is disconnected when any one of the first sheet-shaped battery cell or the second sheet-shaped battery cell is short-circuited so as to cut off the electrical connection between the first sheet-shaped battery cell and the second sheet-shaped battery cell.
Drawings
FIG. 1 is a schematic view of a battery pack and power tool;
fig. 2 is a structural view of a battery pack as one of the embodiments;
fig. 3 is a schematic view of the internal structure of the battery pack shown in fig. 1 with the case removed;
FIG. 4 is a schematic view of the electric core assembly of the battery pack shown in FIG. 1;
fig. 5 is a block diagram of a short-circuit protection circuit for a battery pack as one embodiment;
fig. 6 is a block diagram of a short-circuit protection circuit for a battery pack as one embodiment;
fig. 7 is a block diagram of a short-circuit protection circuit for a battery pack as one embodiment;
fig. 8 is a block diagram of a short-circuit protection circuit for a battery pack as one embodiment;
fig. 9 is a schematic view of an internal structure of a battery pack removal case according to an embodiment;
fig. 10 is a block diagram of a short-circuit protection circuit for a battery pack as one embodiment;
fig. 11 is a block diagram of a short-circuit protection circuit for a battery pack as an embodiment.
Detailed Description
The invention is described in detail below with reference to the figures and the embodiments.
Fig. 1 shows a power tool 20 and a battery pack 10 that can be adapted to power the power tool. In fig. 1, the power tool 20 is a power drill. While the present embodiment is directed to a power drill, it should be understood that the present application is not limited to the disclosed embodiments, but is applicable to other types of power tools, including, but not limited to, power hammers 30, sanders 40, angle grinders, power drills, power wrenches, power saws.
The electric power tool 20 includes a tool main body 201, and a tool interface 2011 and a tool fitting portion 2012 provided on the tool main body 201, and the battery pack 10 is provided with a battery pack interface 101 and a battery pack coupling portion 102. The battery pack interface 101 is used to adapt the tool interface 2011 to power the power tool. The battery pack coupling part 102 is detachably connectable to the tool fitting part 2012 so that the battery pack 10 can supply power to the power tool 20.
In the following description, the vertical and longitudinal directions are described using the directions indicated by the arrows in fig. 2.
Referring to fig. 1 to 2, a battery pack 10 includes a housing 11, a circuit board 12, a cell assembly 13, and a cell support 14.
The housing 11 includes an upper housing 111 and a lower housing 112. The upper case 111 and the lower case 112 are assembled to form a receiving space for fixing and receiving the electric core assembly 13. A battery pack interface 101 is formed on one surface of the housing 11, and the battery pack interface 101 includes a power supply positive interface 1011, a power supply negative interface 1012, and a power supply communication interface 1013. The battery pack 10 provides electric energy for the electric tool through a positive power interface 1011 and a negative power interface 1012; and communicates with the power tool 20 through the power source communication interface 1013.
The electric core assembly 13 is disposed in an accommodating space formed by the housing 11. The battery assembly 13 includes one or more non-cylindrical battery cells, and specifically, the battery assembly 13 includes one or more sheet-shaped battery cells 131, and the plurality of sheet-shaped battery cells 131 are arranged in a stacked manner. In some embodiments, the sheet-shaped battery cells 131 are flat, and the battery cells are stacked up and down. In other embodiments, the cells 131 may be curved in an arc shape. The cell 131 also includes a package 1311, the package 1311 being used to package the cell to prevent leakage of compounds within the cell. In some specific embodiments, the package 1311 may be, but is not limited to, an aluminum plastic film. The electric core assembly 13 further comprises an electric core assembly positive terminal and an electric core assembly negative terminal.
Referring to fig. 3 to 4, each sheet-shaped battery cell 131 further includes a tab 132, and the tab 132 is disposed at least one end of the sheet-shaped battery cell 131 and protrudes from the sheet-shaped battery cell 131. The tab 132 can be arranged on the left end surface 133 of the electric core assembly 13 or on the right end surface 134 of the electric core assembly 13; or some tabs 132 are distributed on the left end face 133 of the core assembly, and other tabs are distributed on the right end face 134; there may also be distributed tabs 132 on at least one or several faces, without limitation.
The circuit board 12 is located between the upper shell 111 and the electric core assembly 13, and is electrically connected to the electric core assembly 13. The circuit board 12 includes a battery pack terminal 121, a power management module (not shown). The power management module is configured to perform power management on the battery pack 10 to implement charging and discharging management of the battery pack 10. The battery pack terminal 121 is located in the battery pack interface 101 to output power of the battery pack 10. The battery pack terminal 121 includes a battery pack positive terminal 1211, a battery pack negative terminal 1212, and a battery pack communication terminal 1213. The positive terminal of the battery pack is located in the positive power interface 1011 and is electrically connected to the positive terminal of the battery pack, and the negative terminal 1212 of the battery pack is located in the negative power interface 1012 and is electrically connected to the negative terminal of the battery pack, so as to supply power to the electric tool 20 connected to the battery pack interface 101. The battery pack communication terminal 1213 is located in the power supply communication interface 1013 to communicate with the electric power tool 20 that is connected to the battery pack interface 101.
Cell supports 14 are disposed at both ends of the cell assembly 13, and at least a portion of the cell supports 14 encapsulate the tabs 132. In some embodiments, the cell support 14 includes a first support 141 and a second support 142, the first support 141 is located on the left end surface 133 of the cell assembly, and the left end surface 133 is a surface on which the tab 132 is provided on the cell assembly 13. The second support member 142 is disposed on the right end 134 of the electrical core assembly, and the right end 134 and the left end 133 are opposite to each other. The cell support member 14 fixes the tab 132 in an encapsulated manner. The tab 132 quickly transmits the heat inside the battery cell, and the battery cell assembly 13 quickly transmits the heat inside through the plurality of tabs 12. Since the cell support member 14 has a certain thermal conductivity (the thermal conductivity is greater than or equal to 0.6W/(m · k)), and the cell support member encapsulates the tab, the heat of the cell assembly 13 is rapidly conducted out through the cell support member 14 contacting with the tab 12, thereby increasing the heat dissipation effect.
Referring to fig. 4, the battery pack further includes a protection device 15. The cell assembly 13 includes a plurality of sheet-shaped cells 131 arranged in a stacked manner. Each sheet-like cell 131 includes a cell positive tab 1321 and a cell negative tab 1322. The cell tabs 132 are connected in series or in parallel to each other so that the cell assembly 13 outputs electric energy with rated power. Here, for convenience of description, the two serially connected sheet-shaped cells 131 are defined as a first sheet-shaped cell 1312 and a second sheet-shaped cell 1313, respectively.
The protective device 15 is disposed between the first sheet-like cell 1312 and the second sheet-like cell 1313 connected in series. Specifically, the protection device 15 is connected in series between the positive electrode of the first sheet-shaped cell 1312 and the negative electrode of the second sheet-shaped cell 1313. When a short circuit occurs in any one of the first sheet-shaped battery cell 1312 and the second sheet-shaped battery cell 1313, the protection device 15 is disconnected to cut off the electrical connection between the first sheet-shaped battery cell 1312 and the second sheet-shaped battery cell 1313, and the battery pack 10 stops outputting electric energy.
As shown in fig. 5, the battery pack 10 is connected to the power tool 20 to supply power to the power tool 20, the positive terminal 1211 of the battery pack is electrically connected to the positive interface 2013 of the power tool, and the negative terminal 1212 of the battery pack is electrically connected to the negative interface 2014 of the power tool. The electric energy of the electric core assembly 13 is output to the electric tool 20 through the tabs 132 (positive and negative electrodes of the electric core), the positive electrode line 124, the negative electrode line 125, the positive terminal 1211 of the battery pack, and the negative terminal 1212 of the battery pack, specifically, the electric current passes through the positive terminal 133 of the electric core assembly, the positive electrode line 124, the positive terminal 1211 of the battery pack to the electric tool 20, and then returns to the electric core assembly 13 through the negative terminal 1212 of the battery pack, the negative electrode line 125, the negative terminal 134 of the electric core assembly, so that the electric core assembly 13, the positive electrode line 124, the negative electrode line 125, the positive terminal 1211 of the battery pack, the negative terminal 1212 of the battery pack, and the electric.
Wherein the cell assembly 13 comprises a plurality of sheet-shaped cells 131 connected in series, in some examples, the cell assembly 13 comprises 4 sheet-shaped cells 131 connected in series, and the protective device 15 is connected in series between adjacent sheet-shaped cells 131. Specifically, the protection device 15 is connected in series between the positive tab 1321 of the sheet-shaped cell and the negative tab 1322 of the adjacent sheet-shaped cell.
In some cases, when any one of the sheet-shaped battery cells 131 is short-circuited, the current flowing through the protection device 15 increases, and when the current reaches a certain height, the protection device 15 generates heat and fuses, so that the electrical connection between the sheet-shaped battery cells 131 is cut off, and the battery pack 10 stops outputting electric energy, thereby improving the safety and reliability of the battery pack 10. When the battery pack terminal 121 is short-circuited, the current flowing through the protection device 15 rises, and when the current reaches a certain height, the protection device 15 is heated and fused, so that the electrical connection between the sheet-shaped battery cores 131 is cut off, the battery pack 10 stops outputting electric energy, and the safety and the reliability of the battery pack 10 are improved. In other embodiments, when a short circuit occurs at any position on the current loop, the protection device 15 can be opened to cut off the current loop, and the battery pack 10 stops outputting power.
In some embodiments, the protection device 15 is a current fuse or a temperature fuse, in other embodiments, the protection device 15 is a self-recovery fuse, and when the fault of the battery pack 10 is eliminated, the self-recovery fuse can be automatically reset without being disassembled and replaced, and the battery pack 10 can be continuously used, so that the service life of the battery pack 10 is prolonged.
In other embodiments, the protection device 15 may also be an electronic switch, which will be described in detail later in conjunction with the embodiments.
In other embodiments, as shown in fig. 6, the battery pack 10 is connected to the power tool 20 to power the power tool 20, the positive terminal 1211 of the battery pack is electrically connected to the positive interface 2013 of the power tool, and the negative terminal 1212 of the battery pack is electrically connected to the negative interface 2014 of the power tool. The electric energy of the electric core assembly 13 is output to the electric tool 20 through the tab 132, the positive wire 124, the negative wire 125, the battery pack positive terminal 1211 and the battery pack negative terminal 1212, specifically, the current flows through the electric core assembly positive terminal 133, the positive wire 124, the battery pack positive terminal 1211 to the electric tool 20, and then flows through the battery pack negative terminal 1212, the negative wire 125 and the electric core assembly negative terminal 134 to the electric core assembly 13, so that the electric core assembly 13, the positive wire 124 and the negative wire 125, the battery pack positive terminal 1211, the battery pack negative terminal 1212 and the electric tool 20 form a current loop.
The cell assembly 13 includes a plurality of sheet-shaped cells 131, and the sheet-shaped cells 131 are connected in parallel and then in series. Specifically, the electric core assembly 13 includes a first sheet-shaped electric core 1312 and a second sheet-shaped electric core 1313. The first and second sheet-shaped cells 1312 and 1313 are connected in series with each other, wherein the first and second sheet-shaped cells 1312 and 1313 respectively include a plurality of sheet-shaped cells 131 connected in parallel. The protection device 15 is connected in series between the first sheet-shaped cell 1312 and the second sheet-shaped cell 1313. In some embodiments, the first and second sheet cells 1312 and 1313 each include two sheet cells 131 connected in parallel. The protection device 15 is connected in series between the positive electrode tab of the first sheet-shaped cell 1312 and the negative electrode tab of the second sheet-shaped cell 1313. When the sheet-shaped battery cell 131 is short-circuited, the protection device 15 is disconnected to cut off the electrical connection between the first sheet-shaped battery cell 1312 and the second sheet-shaped battery cell 1313.
In some cases, when the sheet-shaped battery cells 131 are short-circuited, the current flowing through the protection device 15 increases, and when the current reaches a certain height, the protection device 15 generates heat and fuses, so that the electrical connection between the sheet-shaped battery cells 131 is cut off, the battery pack 10 stops outputting electric energy, and the safety and reliability of the battery pack 10 are improved. When the battery pack terminal 121 is short-circuited, the current flowing through the protection device 15 rises, and when the current reaches a certain height, the protection device 15 is heated and fused, so that the electrical connection between the sheet-shaped battery cores 131 is cut off, the battery pack 10 stops outputting electric energy, and the safety and the reliability of the battery pack 10 are improved. In other embodiments, when a short circuit occurs at any position on the current loop, the protection device 15 can be opened to cut off the current loop, and the battery pack 10 stops outputting power.
In some embodiments, the protection device 15 is a current fuse or a temperature fuse, in other embodiments, the protection device 15 is a self-recovery fuse, and when the fault of the battery pack 10 is eliminated, the self-recovery fuse can be automatically reset without being disassembled and replaced, and the battery pack 10 can be continuously used, so that the service life of the battery pack 10 is prolonged.
In other embodiments, the protection device 15 may also be an electronic switch, which will be described in detail later in conjunction with the embodiments.
In other embodiments, as shown in fig. 7, the battery pack 10 is connected to the power tool 20 to power the power tool 20, the positive terminal 1211 of the battery pack is electrically connected to the positive interface 2013 of the power tool 20, and the negative terminal 1212 of the battery pack is electrically connected to the negative interface 2014 of the power tool 20. The electric energy of the electric core assembly 13 is output to the electric tool 20 through the tab 132, the positive wire 124, the negative wire 125, the battery pack positive terminal 1211 and the battery pack negative terminal 1212, specifically, the electric current flows through the electric core assembly positive terminal 133, the positive wire 124, the battery pack positive terminal 1211 to the electric tool 20, and then flows through the battery pack negative terminal 1212, the negative wire 125 and the electric core assembly negative terminal 134 to the electric core assembly 13, so that the electric core assembly 13, the positive wire 124, the negative wire 125, the battery pack positive terminal 1211, the negative terminal 1212 and the electric tool 20 form a current loop.
The cell assembly 13 includes a plurality of sheet-shaped cells 131 connected in series and then in parallel. Specifically, the electric core assembly 13 includes a first sheet-shaped electric core 1312a and a second sheet-shaped electric core 1313a connected in series with the first sheet-shaped electric core 1312a, and a first sheet-shaped electric core 1312b and a second sheet-shaped electric core 1313b connected in series with the first sheet-shaped electric core 1312b, wherein a positive tab of the first sheet-shaped electric core 1312a is electrically connected to a positive tab of the first sheet-shaped electric core 1312b, and a negative tab of the second sheet-shaped electric core 1313a is electrically connected to a negative tab of the second sheet-shaped electric core 1313 b. The protection device 15 is connected in series between the first sheet-shaped cell 1312 and the second sheet-shaped cell 1313. Specifically, the protection device 15 is connected in series between the negative electrode tab of the first sheet-shaped cell 1312 and the positive electrode tab of the second sheet-shaped cell 1313. When the sheet-shaped battery cell 131 is short-circuited, the protection device 15 is disconnected to cut off the electrical connection between the first sheet-shaped battery cell 1312 and the second sheet-shaped battery cell 1313.
In some cases, when any one of the sheet-shaped battery cells 131 is short-circuited, the current flowing through the protection device 15 increases, and when the current reaches a certain height, the protection device 15 generates heat and fuses, so that the electrical connection between the sheet-shaped battery cells 131 is cut off, and the battery pack 10 stops outputting electric energy, thereby improving the safety and reliability of the battery pack 10. When the battery pack terminal 121 is short-circuited, the current flowing through the protection device 15 rises, and when the current reaches a certain height, the protection device 15 is heated and fused, so that the electrical connection between the sheet-shaped battery cores 131 is cut off, the battery pack 10 stops outputting electric energy, and the safety and the reliability of the battery pack 10 are improved. In other embodiments, when a short circuit occurs at any position on the current loop, the protection device 15 can be opened to cut off the current loop, and the battery pack 10 stops outputting power.
In some embodiments, the protection device 15 is a current fuse or a temperature fuse, in other embodiments, the protection device 15 is a self-recovery fuse, and when the fault of the battery pack 10 is eliminated, the self-recovery fuse can be automatically reset without being disassembled and replaced, so that the battery pack 10 can be continuously used, and the service life of the battery pack 10 is prolonged.
In other embodiments, the protection device 15 may also be an electronic switch. As shown in fig. 8, the battery pack 10 further includes a current detection device 16 and a controller 17. The battery pack 10 is coupled to the power tool 20 to power the power tool 20, the battery pack positive terminal 1211 is electrically coupled to the power tool positive interface 2013, and the battery pack negative terminal 1212 is electrically coupled to the power tool negative interface 2014. The electric energy of the electric core assembly 13 is output to the electric tool 20 through the tab 132, the positive wire 124, the negative wire 125, the battery pack positive terminal 1211 and the battery pack negative terminal 1212, specifically, the electric current flows through the electric core assembly positive electrode 133, the positive wire 124, the battery pack positive terminal 1211 to the electric tool 20, and then flows through the battery pack negative terminal 1212, the negative wire 125 and the electric core assembly negative electrode 134 to return to the electric core assembly 13, so that the electric core assembly 13, the positive wire 124, the negative wire 125, the battery pack positive terminal 1211, the negative terminal 1212 and the electric tool 20 form a current loop.
The current detection device 16 is used for detecting the current of the current loop of the battery pack; the protection device 15 is used for turning on or off the electrical connection between the first sheet-shaped cell 1312 and the second sheet-shaped cell 1313; a controller 17 configured to output a control signal to turn off the protection device 15 to cut off the electrical connection of the first sheet-shaped cell 1312 and the second sheet-shaped cell 1313 when the current detection device 16 detects that the current of the battery pack terminal 121 is equal to or greater than the current threshold value.
The current detection device 16 is used for detecting the current of the battery pack terminal 121 and sending a detected current value signal to the controller 17, and the current detection device 16 is disposed on the circuit board 12, and may be disposed on another circuit board, which is not limited herein.
And a protection device 15 electrically connected between the first sheet-shaped cell 1312 and the second sheet-shaped cell 1313, for turning on or off the electrical connection between the first sheet-shaped cell 1312 and the second sheet-shaped cell 1313. The turning on and off of the protection device 15 is controlled by the controller 17. The protection device 15 is disposed on the circuit board 12, and the protection device 15 may be a metal oxide semiconductor transistor (MOSFET), an Insulated Gate Bipolar Transistor (IGBT), a relay, or other electronic switches. In some embodiments, the protection device 15 may be disposed on other circuit boards, and is not limited herein. The protection device 15 is disposed between the sheet-shaped battery cells connected in series, specifically, the protection device 15 is connected in series between one sheet-shaped battery cell positive tab 1321 and another sheet-shaped battery cell negative tab 1322, and one or more protection devices 15 may be provided.
And a controller 17 electrically connected to the protection device 15 and the current detection device 16, respectively, wherein the controller 17 receives a current value signal from the current detection device 16, and outputs a control signal for turning off the protection device 15 to cut off the electrical connection between the first sheet-shaped battery cell 1312 and the second sheet-shaped battery cell 1313 when the current detection device detects that the current of the battery pack terminal 121 is greater than a current threshold value.
Like this, set up protection device 15 between the flaky electricity core 131 of series connection, when battery package 10 current loop takes place the short circuit, when the electric current through protection device 15 risees to certain height and heat, as long as a protection device 15 disconnection can cut off the current loop, battery package 10 stops output electric energy promptly, ensures battery safety, reduces battery package 10 and leads to the potential safety hazard of explosion because of the short circuit, improves battery package 10's security and reliability. Preferably, a resettable fuse is used as the protection device 15, which can extend the service life of the battery pack 10.
As shown in fig. 9, the cell assembly 13 includes a plurality of sheet-shaped cells 131 connected in series, and a circuit board 12 is disposed above the cell assembly 13, and the circuit board 12 includes a positive input terminal 122 and a negative input terminal 123. The positive input end 122 is electrically connected with a positive line 124, and the negative input end 123 is electrically connected with a negative line 125; the electric power of the battery pack 10 is output to the electric power tool 20 through the tab 132, the positive and negative lines 124 and 125, the positive input terminal 122 and the negative input terminal 123 of the circuit board, and the battery pack terminal 121. Specifically, the current flows through the positive electric core assembly terminal 133, the positive electrode wire 124, the positive battery pack terminal 1211 to the electric power tool 20, and then flows through the negative battery pack terminal 1212, the negative electrode wire 125, and the negative electric core assembly terminal 134 to the electric core assembly 13, so that the electric core assembly 13, the positive electrode wire 124, the negative electrode wire 125, the negative battery pack terminal 1212, and the electric power tool 20 form a current loop. In other embodiments, the power of the battery pack 10 is output to the power tool 20 through the positive and negative lines 124 and 125, the battery pack positive terminal 1211, and the battery pack negative terminal 1212. Spot welding, line welding or surface welding is adopted between the battery cell 131 and the lead wire and between the sheet-shaped battery cell and the sheet-shaped battery cell. Preferably, the welding is performed using an ultrasonic welding, or laser welding apparatus.
Specifically, referring to fig. 10, the battery pack further includes a current detection device 16, a controller 17, a first protection device 18, and a second protection device 19. The battery pack 10 is connected to the power tool 20 to supply power to the power tool, the positive terminal 1211 of the battery pack is electrically connected to the positive interface 2013 of the power tool, and the negative terminal 1212 of the battery pack is electrically connected to the negative interface 2014 of the power tool. The electric energy of the electric core assembly 13 is output to the electric tool 20 through the electric core assembly positive terminal 133, the negative terminal 134, the positive wire 124, the negative wire 125, the first protection device 18, the second protection device 19, the battery pack positive terminal 1211 and the battery pack negative terminal 1212, specifically, the electric current returns to the electric core assembly 13 through the electric core assembly positive terminal 133, the positive wire 124, the second protection device 19, the first protection device 18, the battery pack positive terminal 1211 and the electric tool 20, and then through the battery pack negative terminal 1212, the negative wire 125 and the electric core assembly negative terminal 134, so that the electric core assembly 13, the positive wire 124, the negative wire 125, the first protection device 18, the second protection device 19, the battery pack 1211, the battery pack negative terminal 1212 and the electric tool 20 form a current loop.
The current detection device 16 is used for detecting the current of the current loop of the battery pack; the first protection device 18 is used for switching on or off the electrical connection between the battery pack terminal and the battery pack terminal 121; a controller 17 configured to output a control signal for turning off the first protection device 18 to cut off the electrical connection between the battery pack terminal 121 and the electric core assembly terminal when the current detection device 16 detects that the current of the battery pack current loop is greater than or equal to the first current threshold; the second protection device is used for disconnecting the electric connection between the battery pack terminal 121 and the electric core assembly terminal when the current of the battery pack current loop is larger than or equal to a second current threshold value. Wherein the second current threshold is greater than the first current threshold.
In some embodiments, the current detection device 16 is configured to detect a current of the current loop of the battery pack and send a detected current value signal to the controller 17, and the current detection device 16 is disposed on the circuit board 12, and may be disposed on another circuit board, which is not limited herein.
The first protection device 18 is electrically connected between the electric core assembly terminal and the battery pack terminal 121, and is used for turning on or off the electric connection between the tab 132 and the battery pack terminal 121. The turning on and off of the first protection device 18 is controlled by the controller 17. The first protection device 18 is disposed on the circuit board 12, and the first protection device 18 may be a metal oxide semiconductor transistor (MOSFET), an Insulated Gate Bipolar Transistor (IGBT), a relay, or other electronic switch. In some embodiments, the first protection device 18 may be disposed on other circuit boards, and is not limited herein.
The controller 17 is electrically connected to the first protection device 18 and the current detection device 16, respectively, and the controller 17 receives a current value signal from the current detection device 16, and outputs a control signal for turning off the first protection device 18 to cut off the electrical connection between the battery pack terminal 121 and the tab 132 when the current detection device 16 detects that the current of the battery pack current loop is greater than or equal to a first current threshold.
And a second protection device 19 electrically connected between the core assembly terminal and the battery pack terminal 121, wherein when the current of the battery pack terminal 121 is greater than or equal to a second current threshold, the second protection device 19 is disconnected to cut off the electrical connection between the battery pack terminal 121 and the core assembly terminal. In some embodiments, second protective device 19 is connected in series between battery pack positive terminal 1211 and battery pack positive terminal 133. In other embodiments, the second protection device 19 is disposed between the sheet-shaped cells connected in series, specifically, the second protection device 19 is connected in series between the positive tab 1321 of one sheet-shaped cell and the negative tab 1322 of another sheet-shaped cell, and one or more second protection devices 19 may be provided. In some embodiments, the second protection device 19 is a current fuse or a temperature fuse, in other embodiments, the second protection device 19 is a self-recovery fuse, and when the failure of the battery pack 10 is eliminated, the self-recovery fuse can be automatically reset without being removed and replaced, so that the battery pack 10 can be continuously used, and the service life of the battery pack 10 is prolonged.
When the current of the current loop of the battery pack is greater than or equal to the first current threshold, the first protection device 18 is turned off to protect the battery pack 10. When the current returns to the normal value, the first protection device 18 is turned on, and the battery pack 10 can also work normally, so that the service life of the battery pack 10 is prolonged. First protection device 18 and second protection device 19 set up simultaneously, and under the condition that first protection device 18 became invalid, the electric current through second protection device 19 rose to the second threshold value in the short circuit takes place in arbitrary position on the current circuit, and second protection device 19 disconnection can cut off the electric connection of utmost point ear 132 and battery package terminal 121, ensures battery safety, reduces the battery package 10 current circuit because of the short circuit leads to the potential safety hazard of explosion on fire, improves the security and the reliability of battery package.
In other embodiments, as shown with reference to fig. 11, the battery pack 10 further includes a temperature sensor 21.
The temperature sensor 21 is electrically connected to the circuit board 12 for detecting the temperature of the core assembly 13. Specifically, the temperature sensor 21 is configured to detect a temperature of the battery cell 131, and when the temperature of the battery cell 131 is greater than or equal to a first threshold, the controller 17 outputs a control signal for disconnecting the first protection device 18 to cut off the electrical connection between the battery pack terminal 121 and the tab 132. In some embodiments, the temperature sensor 18 is disposed on a side of the tab 132 adjacent to the cell support member 14. In other embodiments, the temperature sensor 16 may also be disposed on the electric core assembly 13. Alternatively, one or more temperature sensors 21 may be provided; the temperature sensor 21 may be a thermistor, a thermocouple, a digital temperature sensor, or the like.
And a second protection device 19 electrically connected between the core assembly terminal and the battery pack terminal 121, wherein when the current of the battery pack terminal 121 is greater than a second threshold value, the second protection device 19 is disconnected to cut off the electrical connection between the battery pack terminal 121 and the tab 132. In some embodiments, the second protection device 19 is a current fuse or a temperature fuse, in other embodiments, the second protection device 19 is a self-recovery fuse, and when the failure of the battery pack 10 is eliminated, the self-recovery fuse can be automatically reset without being removed and replaced, so that the battery pack 10 can be continuously used, and the service life of the battery pack 10 is prolonged.
When the temperature of the cell assembly 13 is equal to or higher than the first threshold value, the first protection device 18 is disconnected to protect the battery pack. When the temperature returns to the normal value, the first protection device 18 is conducted, and the battery pack can still work normally. The first protection device 18 and the second protection device 19 are arranged at the same time, under the condition that a short circuit occurs at any position on a current loop and the first protection device 18 fails, when the current passing through the second protection device 19 rises to a certain height and heat, the second protection device 19 is disconnected to cut off the electric connection between the tab 132 and the battery pack terminal 121, the battery safety is guaranteed, the potential safety hazard of fire and explosion caused by the short circuit of the current loop of the battery pack 10 is reduced, and the safety and the reliability of the battery pack are improved.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent variations fall within the scope of the present invention.
Claims (14)
1. A battery pack, comprising:
a housing;
an electric core assembly disposed within the housing:
the electric core component at least comprises:
a first non-cylindrical electric core with a cylindrical shape,
the second non-cylindrical battery cell is connected with the first non-cylindrical battery cell in series;
the protection device is connected in series between the first non-cylindrical battery cell and the second non-cylindrical battery cell; the protection device is disconnected to cut off the electric connection between the first non-cylindrical battery cell and the second non-cylindrical battery cell when any one of the first non-cylindrical battery cell or the second non-cylindrical battery cell is short-circuited.
2. The battery pack according to claim 1,
the protection device includes one of a current fuse, a temperature fuse, or a self-healing fuse.
3. The battery pack according to claim 1,
the protection device is an electronic switch.
4. The battery pack according to claim 1,
the battery pack further includes:
the lug is arranged at least one end of the non-cylindrical battery cell and protrudes out of the non-cylindrical battery cell;
and the battery pack terminal is electrically connected with the lug.
5. The battery pack according to claim 4,
the battery pack further includes:
the current detection device is used for detecting the current of the battery pack terminal;
a controller; and the control circuit is configured to output a control signal for disconnecting the protection device so as to cut off the electrical connection between the first non-cylindrical battery cell and the second non-cylindrical battery cell when the current detection device detects that the current of the battery pack terminal is greater than or equal to a current threshold value.
6. A battery pack, comprising:
a housing;
an electrical core assembly disposed within the housing;
the battery pack terminal is used for outputting the electric energy of the electric core assembly to supply power for an electric device;
wherein the content of the first and second substances,
the electric core assembly comprises:
the battery comprises a plurality of laminated sheet-shaped battery cells, a plurality of battery cells and a plurality of battery cells, wherein the plurality of sheet-shaped battery cells are connected in series or in parallel;
and the protection device is connected in series in a current loop formed by the electric core assembly and the battery pack terminal, and is disconnected when the current loop is short-circuited so as to cut off the current loop.
7. The battery pack according to claim 6,
the protection device includes one of a current fuse, a temperature fuse, or a self-healing fuse.
8. The battery pack according to claim 6,
the protection device is an electronic switch.
9. The battery pack according to claim 6,
the battery pack further includes:
the current detection device is used for detecting the current of the current loop;
a controller; and the control device is configured to output a control signal for disconnecting the protection device so as to cut off the electrical connection between the sheet-shaped battery cores when the current detection device detects that the current of the current loop is greater than or equal to a current threshold value.
10. A battery pack, comprising:
a housing;
an electrical core assembly disposed within the housing;
the electric core assembly comprises a plurality of sheet-shaped electric cores and electric core assembly terminals; the sheet-shaped battery cells are arranged in a laminated manner;
the sheet-shaped battery cell comprises a packaging part, and the packaging part is used for packaging the battery cell;
the lug is arranged at least one end of the sheet-shaped battery cell and protrudes out of the battery cell;
the battery pack terminal is electrically connected with the lug;
the current detection device is used for detecting the current of a current loop formed by the battery pack assembly and the battery pack terminal;
the first protection device is connected between the battery pack terminal and the battery pack terminal in series;
when the current of the current loop of the battery pack is greater than or equal to a first current threshold value, the first protection device is disconnected to cut off the electrical connection between the battery pack terminal and the battery pack terminal;
the second protection device is connected between the battery pack terminal and the battery pack terminal in series;
when the current of the current loop of the battery pack is larger than or equal to a second current threshold value, the second protection device is disconnected to cut off the electrical connection between the terminal of the battery pack and the terminal of the electric core assembly.
11. The battery pack according to claim 10,
the second current threshold is greater than the first current threshold.
12. The battery pack according to claim 10,
the battery pack further includes: a controller configured to:
when the current detection device detects that the current of the current loop of the battery pack is greater than or equal to a first current threshold value, a control signal for disconnecting the first protection device is output to cut off the electrical connection between the electric core assembly terminal and the battery pack terminal.
13. The battery pack according to claim 10,
the second protection device includes one of a current fuse, a temperature fuse, or a self-healing fuse.
14. The battery pack according to claim 10,
the first protection device is an IGBT or a MOSFET.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2019108948880 | 2019-09-20 | ||
| CN201910894888 | 2019-09-20 |
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| CN112542663A true CN112542663A (en) | 2021-03-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010976731.5A Pending CN112542663A (en) | 2019-09-20 | 2020-09-17 | Battery pack and electric tool adopting same |
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| CN (1) | CN112542663A (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040052845A (en) * | 2004-05-10 | 2004-06-23 | 넥스콘 테크놀러지 주식회사 | Device of Preventing Short-Circuit of Outside Charging Terminal for a Battery Chargeable Cellular Phone |
| CN102025129A (en) * | 2009-09-17 | 2011-04-20 | 新普科技股份有限公司 | Charge and discharge protection circuit and charge protection method |
| KR20110108010A (en) * | 2010-03-26 | 2011-10-05 | 주식회사 엘지화학 | Middle or large sized battery pack and packaging method thereof |
| CN104779661A (en) * | 2014-01-15 | 2015-07-15 | 株式会社牧田 | Battery pack |
| US20160141728A1 (en) * | 2013-06-26 | 2016-05-19 | Techtronic Power Tools Tecnology Limited | Battery pack, tool battery and battery operated tool |
| CN106711550A (en) * | 2016-12-28 | 2017-05-24 | 深圳天珑无线科技有限公司 | Self-heating battery and terminal equipment |
| WO2017129146A1 (en) * | 2016-01-29 | 2017-08-03 | 苏州安靠电源有限公司 | Parallelly connected grid having safety protection feature and high capacity battery using said parallelly connected grid |
| CN107231015A (en) * | 2016-09-20 | 2017-10-03 | 华为技术有限公司 | A kind of battery, terminal and charging system |
| CN206697534U (en) * | 2017-04-13 | 2017-12-01 | 深圳市华宝新能源股份有限公司 | A kind of battery bag |
| WO2019024873A1 (en) * | 2017-08-01 | 2019-02-07 | 格力电器（武汉）有限公司 | Soft pack lithium ion battery and manufacturing method therefor |
-
2020
- 2020-09-17 CN CN202010976731.5A patent/CN112542663A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040052845A (en) * | 2004-05-10 | 2004-06-23 | 넥스콘 테크놀러지 주식회사 | Device of Preventing Short-Circuit of Outside Charging Terminal for a Battery Chargeable Cellular Phone |
| CN102025129A (en) * | 2009-09-17 | 2011-04-20 | 新普科技股份有限公司 | Charge and discharge protection circuit and charge protection method |
| KR20110108010A (en) * | 2010-03-26 | 2011-10-05 | 주식회사 엘지화학 | Middle or large sized battery pack and packaging method thereof |
| US20160141728A1 (en) * | 2013-06-26 | 2016-05-19 | Techtronic Power Tools Tecnology Limited | Battery pack, tool battery and battery operated tool |
| CN104779661A (en) * | 2014-01-15 | 2015-07-15 | 株式会社牧田 | Battery pack |
| WO2017129146A1 (en) * | 2016-01-29 | 2017-08-03 | 苏州安靠电源有限公司 | Parallelly connected grid having safety protection feature and high capacity battery using said parallelly connected grid |
| CN107231015A (en) * | 2016-09-20 | 2017-10-03 | 华为技术有限公司 | A kind of battery, terminal and charging system |
| CN106711550A (en) * | 2016-12-28 | 2017-05-24 | 深圳天珑无线科技有限公司 | Self-heating battery and terminal equipment |
| CN206697534U (en) * | 2017-04-13 | 2017-12-01 | 深圳市华宝新能源股份有限公司 | A kind of battery bag |
| WO2019024873A1 (en) * | 2017-08-01 | 2019-02-07 | 格力电器（武汉）有限公司 | Soft pack lithium ion battery and manufacturing method therefor |
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