CN115483076B - Fuse device suitable for battery pack, battery pack and electric tool - Google Patents
Fuse device suitable for battery pack, battery pack and electric tool Download PDFInfo
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- CN115483076B CN115483076B CN202110665716.3A CN202110665716A CN115483076B CN 115483076 B CN115483076 B CN 115483076B CN 202110665716 A CN202110665716 A CN 202110665716A CN 115483076 B CN115483076 B CN 115483076B
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- memory elastic
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- 230000036760 body temperature Effects 0.000 claims abstract description 14
- 238000003491 array Methods 0.000 claims abstract description 4
- 239000007769 metal material Substances 0.000 claims description 4
- 229910001000 nickel titanium Inorganic materials 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 abstract description 11
- 230000002159 abnormal effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
- H01H85/02—Details
- H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
- H01H85/05—Component parts thereof
- H01H85/055—Fusible members
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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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
- H01H85/02—Details
- H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
- H01H85/05—Component parts thereof
- H01H85/055—Fusible members
- H01H85/06—Fusible members characterised by the fusible material
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/574—Devices or arrangements for the interruption of current
- H01M50/583—Devices or arrangements for the interruption of current in response to current, e.g. fuses
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention discloses a fuse device suitable for a battery pack, the battery pack and an electric tool, wherein the fuse device is connected between two array poles of the battery pack and consists of a primary fuse and a memory elastic fuse which are connected in parallel; one end of the original fuse is fixed on the first array, and the other end is fixed on the second array; one end of the memory elastic fuse is fixed on the second array, and the other end of the memory elastic fuse is connected with one end of the original fuse fixed on the first array in an unfixed manner; when the current flowing through the memory elastic fuse makes the body temperature reach the memory deformation threshold value, the unfixed connection with the original fuse is disconnected; and then the original fuse is subjected to fusing protection according to the total current between the two arrays of poles. The heating of the fuse body is reduced through the memory elastic fuse shunt, the safety threat of the fuse to the battery pack body and the structure is avoided, after the memory elastic fuse is deformed and disconnected, the fusing of the original fuse is not affected, and the safety of the battery pack is further improved.
Description
Technical Field
The invention relates to the technical field of battery pack safety, in particular to a fuse device suitable for a battery pack, the battery pack and an electric tool.
Background
With the progress of society, various types of electric tools such as professional electric tools, household electric tools, garden electric tools, etc. are increasingly used in our lives, and battery pack technology as a power source thereof is also continuously developed.
Safety of the battery pack is one of the most fundamental and important characteristics for evaluating the performance of the battery pack, and one of important structures for ensuring safety of the battery pack during its operation is a fuse in the battery pack, in addition to being related to the material, manufacturing process, and the like of the battery. When the fuse body is in abnormal heavy current, the body is fused in a body heating mode to disconnect the connection with a circuit, so that the safety of the battery pack is protected.
In the prior art, a fuse in a battery pack is a material with a low melting point (higher resistivity), and the body of the fuse is likely to heat when the battery pack is placed at a point due to the existence of resistance of the body material, so that the safety of the body and the structure of the battery pack can be endangered when the heating temperature is too high, and the safety of the body and the structure of the battery pack can be seriously influenced when the fuse is discharged at a high temperature. If the internal resistance of the body is reduced in a mode of enlarging the sectional area of the fuse so as to avoid heating, the phenomenon that the abnormal large current cannot be fused under the condition of stipulating the fusing threshold current and time is faced, so that the safety of the battery pack cannot be protected.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide a fuse device of a battery pack, which can still fuse with high current on the premise of reducing the heating of a fuse body.
In order to achieve the above object, the present invention adopts the following technical scheme:
a fuse device suitable for a battery pack is connected between two arrays of poles of the battery pack,
the fuse device consists of a primary fuse and a memory elastic fuse connected in parallel with the primary fuse;
one end of the original fuse is fixed on the first array, and the other end of the original fuse is fixed on the second array;
one end of the memory elastic fuse is fixed on the second array, and the other end of the memory elastic fuse is in non-fixed connection with one end of the original fuse fixed on the first array;
when the body temperature of the fuse reaches a memory deformation threshold value by the current flowing through the memory elastic fuse, the memory elastic fuse is disconnected from the unfixed connection with the original fuse;
and after the memory elastic fuse is disconnected, the original fuse is subjected to fusing protection according to the total current between the two array poles.
Further, the fusing protection according to the total current between the two arrays of poles comprises:
if the total current between the second array electrodes reaches the fusing threshold value of the original fuse, fusing the original fuse;
otherwise, the fusing protection state of the original fuse is continuously maintained.
Further, while continuing to maintain the fuse protection state of the original fuse,
and if the body temperature of the memory elastic fuse is recovered to be smaller than the memory deformation threshold value, the memory elastic fuse is recovered to be original, and the non-fixed connection with the original fuse is established again.
Further, the resistance of the selected memory elastic fuse is the same as that of the original fuse after being connected in parallel.
Further, the difference between the resistance of the memory elastic fuse and the resistance of the original fuse after being connected in parallel is within a preset acceptable range.
Further, the memory elastic fuse has a memory deformation threshold of 150 ℃.
Further, the memory metal material of the memory elastic fuse is nickel-titanium alloy.
A fuse device suitable for a battery pack is characterized in that the fuse device is connected between two array poles of the battery pack,
the fuse device consists of a primary fuse and a memory elastic fuse connected in parallel with the primary fuse;
one end of the original fuse is fixed on the first array, and the other end of the original fuse is fixed on the second array;
one end of the memory elastic fuse is fixed on the second array, and the other end of the memory elastic fuse is in non-fixed connection with one end of the original fuse fixed on the first array;
when the body temperature of the memory elastic fuse reaches a memory deformation threshold value by the current flowing through the memory elastic fuse, the memory elastic fuse is disconnected from the unfixed connection with the original fuse;
and after the memory elastic fuse is disconnected, if the total current between the second array poles reaches the fusing threshold value of the original fuse, the original fuse is fused.
Further, after the original fuse is disconnected in the memory elastic fuse, if the total current between the second array poles does not reach the fusing threshold value of the original fuse within a certain time, the fusing protection state of the original fuse is continuously maintained, and when the body temperature of the memory elastic fuse is recovered to be smaller than the memory deformation threshold value, the memory elastic fuse is recovered to be original, and the non-fixed connection between the memory elastic fuse and the original fuse is established again.
A fuse device suitable for a battery pack is characterized in that the fuse device is connected between two array poles of the battery pack,
the fuse device consists of a primary fuse and a memory elastic fuse connected in parallel with the primary fuse;
one end of the original fuse is fixed on the first array, and the other end of the original fuse is fixed on the second array;
one end of the memory elastic fuse is fixed on the second array, and the other end of the memory elastic fuse is in non-fixed connection with one end of the original fuse fixed on the first array;
when the body temperature of the memory elastic fuse reaches a memory deformation threshold value by the current flowing through the memory elastic fuse, the memory elastic fuse is disconnected from the unfixed connection with the original fuse;
and after the memory elastic fuse is disconnected, if the total current between the second array poles does not reach the fusing threshold value of the original fuse within a certain time, continuously maintaining the fusing protection state of the original fuse, and restoring the memory elastic fuse to the original state when the body temperature of the memory elastic fuse is restored to be smaller than the memory deformation threshold value, and establishing the non-fixed connection between the memory elastic fuse and the original fuse again.
A battery pack comprising a fuse device, a first array of poles, a second array of poles, and a battery pack;
the first array electrode and the second array electrode are input and output array electrodes of the battery pack;
the fuse device is connected between two array poles of the battery pack,
the fuse device consists of a primary fuse and a memory elastic fuse connected in parallel with the primary fuse;
one end of the original fuse is fixed on the first array, and the other end of the original fuse is fixed on the second array;
one end of the memory elastic fuse is fixed on the second array, and the other end of the memory elastic fuse is in non-fixed connection with one end of the original fuse fixed on the first array;
when the body temperature of the memory elastic fuse reaches a memory deformation threshold value by the current flowing through the memory elastic fuse, the memory elastic fuse is disconnected from the unfixed connection with the original fuse;
and after the memory elastic fuse is disconnected, the original fuse is subjected to fusing protection according to the total current between the two array poles.
Further, after the original fuse is disconnected in the memory elastic fuse, if the total current between the second array poles does not reach the fusing threshold value of the original fuse within a certain time, the fusing protection state of the original fuse is continuously maintained, and when the body temperature of the memory elastic fuse is recovered to be smaller than the memory deformation threshold value, the memory elastic fuse is recovered to be original, and the non-fixed connection between the memory elastic fuse and the original fuse is established again.
An electric tool comprises the battery pack and a host.
The host is all structural components of the electric tool except for a battery pack.
The invention has the advantages that:
the memory elastic fuse is connected in parallel to the original fuse for shunting the original fuse, so that the resistance of the original fuse is reduced, and the heating is reduced; meanwhile, by utilizing the memory characteristic of the elastic fuse, when the heating temperature reaches the memory deformation threshold value, the parallel connection relationship is disconnected, and the fusing protection of the original fuse is not affected. Therefore, on the premise of reducing the threat of the heating of the fuse body to the safety of the battery pack body and the structure, the condition that the fuse cannot be fused under abnormal heavy current is avoided, and the safety of the battery pack is further ensured.
Drawings
Fig. 1 is a schematic view of a battery pack according to an embodiment of the present invention;
fig. 2 is a schematic structural view of a fuse device in a battery pack according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a fuse device in a battery pack according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a memory elastic fuse in a fuse device according to an embodiment of the present invention;
fig. 5 is a schematic diagram of an electric tool according to an embodiment of the present invention.
Detailed Description
The invention is described in detail below with reference to the drawings and the specific embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
It should be noted that, the battery pack in the present invention may be various types of battery packs on various tools or devices, and the battery pack is not limited herein as the application platform of the fuse device in the present application. The first and second do not denote the size or order of the digits, but rather are required for naming.
Referring to fig. 1, a fuse device 11 in a battery pack 10 is connected between a first array electrode 101 and two output array electrodes 102 of the battery pack 10, and is composed of a primary fuse 111 and a memory elastic fuse 112 connected in parallel therewith.
In a specific implementation, referring to the structure shown in fig. 2 and the circuit diagram shown in fig. 3, one end of the original fuse 111 is fixed on the first array pole 101, the other end is fixed on the second array pole 102, one end of the memory elastic fuse 112 is fixed on the second array pole 102, and the other end is non-fixedly connected with one end of the original fuse 111 fixed on the first array pole 101. Alternatively, the fuse may be secured to the array by screws. It is understood that the first and second poles represent either input or output poles in the battery pack 10. The non-fixed connection between the two fuses may be a contact connection, which is understood to mean that the two fuses can be connected together during normal operation, and in other cases the fuses are not in contact, i.e. are not connected, and the fuses are in contact again and are connected in parallel during the restoration of normal operation.
It will be appreciated that the shape of the memory elastic fuse 112 may be selected based on the shape or characteristics of the original fuse 111 or the characteristics of the battery pack 10, such as spiral, sheet, or profile.
In a preferred implementation, the memory elastic fuse 112 may be a spring leaf as shown in fig. 4, which is not fixedly connected to the original fuse 111 in the initial position and the working position, i.e. the parallel connection of the two fuses is maintained, or which is suspended in a state not connected in parallel to the original fuse 111 when the spring leaf is in the initial position; when the temperature reaches the memory deformation threshold value, the spring piece is disconnected from the non-fixed connection, namely the spring piece is not connected with the original fuse 111 in parallel any more, and only the original fuse 111 in the fuse device 11 is subjected to fusing protection.
In particular, when the battery pack 10 is in a normal operating state, the memory elastic fuse 112 in the fuse device 11 shares the current in the circuit, and reduces the body current of the original fuse 111, thereby reducing the heat generation of the body of the original fuse 111. If an abnormally large current occurs in the circuit, the two fuses generate heat, and when the abnormally large current is continuously loaded, and the temperature generated in the memory elastic fuse 112 exceeds a memory deformation threshold, the memory elastic fuse 112 deforms, the parallel connection with the original fuse 111 is disconnected, and the main circuit is disconnected, at the moment, the main current, namely the total current between the first array electrode 101 and the second array electrode 102, is fully loaded to the original fuse 111, and the original fuse 111 is subjected to fusing protection.
It will be appreciated that after the memory elastic fuse 112 is broken, the original fuse 111 is also blown under the load of an abnormally large current to reach the fusing threshold. In particular, when the battery pack 10 is in a sudden abnormal large current caused by external factors or other uncontrollable factors, the elastic fuse 112 is memorized to be disconnected after being deformed, but the current is restored to the normal working current immediately or when the original fuse 111 is not fused, the elastic fuse 112 is memorized to be restored to the original state, namely the normal working position when the body temperature is restored to be smaller than the memory deformation threshold value, and the non-fixed connection with the original fuse 111 is established again. False triggering of the protection of the battery pack 10 by sudden factors is avoided by a parallel fuse arrangement that can be restored to connection.
In order to better achieve the purpose of parallel connection and shunt heat reduction, when the memory elastic fuse 112 is selected, the resistance of the memory elastic fuse 112 is ensured to be the same as that of the original fuse 111 after parallel connection, and the resistance of the body of the original fuse 111 is reduced by 50%. Of course, the resistance of the memory elastic fuse 112 may be different from that of the parallel-connected fuse 111, but in principle, the difference between the two may not be too large, if the difference is large, the effect of reducing the working temperature of the fuse will be affected, and alternatively, the difference between the two may be within a preset acceptable range, for example, may be a difference of one unit or two units.
In a preferred implementation, the memory metal material of the memory elastic fuse 112 may be nickel-titanium alloy, and finally, the effective range of the memory deformation threshold corresponding to the fuse 112 is 120 ℃ to 150 ℃, wherein 150 ℃ is an optimal threshold, and of course, the memory metal material selected by different battery packs 10 may be different, and the range of the corresponding memory deformation threshold is also different.
According to the fuse device suitable for the battery pack, the memory elastic fuse is connected in parallel to the original fuse, so that the original fuse is split, the resistance of the original fuse is reduced, and the heating is reduced; meanwhile, by utilizing the memory characteristic of the elastic fuse, when the heating temperature reaches the memory deformation threshold value, the parallel connection relationship is disconnected, and the fusing protection of the original fuse is not affected. Therefore, on the premise of reducing the threat of the heating of the fuse body to the safety of the battery pack body and the structure, the condition that the fuse cannot be fused under abnormal heavy current is avoided, and the safety of the battery pack is further ensured.
In another embodiment of the present application, there is provided a power tool 100 as shown in fig. 5, the power tool 100 including the battery pack 10 and the main body 20 described above.
The structure and function of the main unit 30 in the electric tool 100 are different depending on the type of electric tool.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (7)
1. A fuse device suitable for a battery pack is characterized in that the fuse device is connected between two array poles of the battery pack,
the fuse device consists of a primary fuse and a memory elastic fuse connected in parallel with the primary fuse;
one end of the original fuse is fixed on the first array, and the other end of the original fuse is fixed on the second array;
one end of the memory elastic fuse is fixed on the second array, and the other end of the memory elastic fuse is in non-fixed connection with one end of the original fuse fixed on the first array;
when the body temperature of the memory elastic fuse reaches a memory deformation threshold value by the current flowing through the memory elastic fuse, the memory elastic fuse is disconnected from the unfixed connection with the original fuse;
after the original fuse is disconnected, the fuse is fused and protected according to the total current between the two array poles; if the total current between the two arrays reaches the fusing threshold value of the original fuse, fusing the original fuse; otherwise, continuing to maintain the fusing protection state of the original fuse;
and when the fusing protection state of the original fuse is continuously maintained, if the body temperature of the memory elastic fuse is recovered to be smaller than the memory deformation threshold value, the memory elastic fuse is recovered to be original, and the non-fixed connection with the original fuse is established again.
2. The fuse apparatus of claim 1, wherein the selected memory elastic fuse has a resistance value that is the same as a resistance value of the original fuse after the parallel connection.
3. The fuse apparatus of claim 1, wherein a difference between a resistance of the memory elastic fuse and a resistance of the original fuse after the parallel connection is within a preset acceptable range.
4. The fuse apparatus of claim 1, wherein the memory elastic fuse has a memory deformation threshold in the range of 120 ℃ to 150 ℃.
5. The fuse apparatus of claim 1, wherein the memory metal material of the memory elastic fuse is a nickel-titanium alloy.
6. A battery pack comprising a fuse device, a first array of poles, a second array of poles and a battery pack;
the first array electrode and the second array electrode are input and output array electrodes of the battery pack;
the fuse device is connected between two array poles of the battery pack,
the fuse device consists of a primary fuse and a memory elastic fuse connected in parallel with the primary fuse;
one end of the original fuse is fixed on the first array, and the other end of the original fuse is fixed on the second array;
one end of the memory elastic fuse is fixed on the second array, and the other end of the memory elastic fuse is in non-fixed connection with one end of the original fuse fixed on the first array;
when the body temperature of the memory elastic fuse reaches a memory deformation threshold value by the current flowing through the memory elastic fuse, the memory elastic fuse is disconnected from the unfixed connection with the original fuse;
after the original fuse is disconnected, the fuse is fused and protected according to the total current between the two array poles;
and after the memory elastic fuse is disconnected, if the total current between the two array poles does not reach the fusing threshold value of the original fuse within a certain time, continuously maintaining the fusing protection state of the original fuse, and restoring the memory elastic fuse to the original state when the body temperature of the memory elastic fuse is restored to be smaller than the memory deformation threshold value, and establishing the non-fixed connection between the memory elastic fuse and the original fuse again.
7. A power tool comprising the battery pack of claim 6 and a host;
the host is all structural components of the electric tool except for a battery pack.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110665716.3A CN115483076B (en) | 2021-06-16 | 2021-06-16 | Fuse device suitable for battery pack, battery pack and electric tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110665716.3A CN115483076B (en) | 2021-06-16 | 2021-06-16 | Fuse device suitable for battery pack, battery pack and electric tool |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115483076A CN115483076A (en) | 2022-12-16 |
| CN115483076B true CN115483076B (en) | 2024-01-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110665716.3A Active CN115483076B (en) | 2021-06-16 | 2021-06-16 | Fuse device suitable for battery pack, battery pack and electric tool |
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| Country | Link |
|---|---|
| CN (1) | CN115483076B (en) |
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| CN212323124U (en) * | 2020-05-27 | 2021-01-08 | 东莞新能安科技有限公司 | Battery pack and electric equipment |
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| CN115483076A (en) | 2022-12-16 |
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