CN109818111B - Battery system and electronic equipment - Google Patents
Battery system and electronic equipment Download PDFInfo
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- CN109818111B CN109818111B CN201910254406.5A CN201910254406A CN109818111B CN 109818111 B CN109818111 B CN 109818111B CN 201910254406 A CN201910254406 A CN 201910254406A CN 109818111 B CN109818111 B CN 109818111B
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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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Abstract
The application discloses battery system, including electric core and protection circuit, the electric core with protection circuit establishes ties, the electric core has first resistance, protection circuit has the second resistance, the second resistance increases along with the rising of temperature. When the environmental temperature of the battery system is continuously increased, the resistance value of the protection circuit is also continuously increased, so that the current passing through the protection circuit, namely the current passing through the battery core, is reduced, the heat generation of the battery system is reduced, and the temperature is prevented from being rapidly increased to thermal runaway; the resistance value of the protection circuit is increased along with the change of the ambient temperature, and the protection circuit is not broken when the temperature reaches a certain value and tends to infinity at one time, so that the battery system has certain tolerance to the ambient temperature, the internal current is gradually reduced while the ambient temperature is continuously increased, and the thermal runaway condition is effectively avoided on the premise that the open-circuit protection cannot be easily triggered.
Description
Technical Field
The present application relates to a battery management technology, and more particularly, to a battery system and an electronic device.
Background
Batteries are widely used in various electronic products, and management of batteries is a problem of great concern for various manufacturers.
Disclosure of Invention
In order to achieve the above purpose, the present application provides the following technical solutions:
a battery system comprises a battery core and a protection circuit;
the battery cell is connected with the protection circuit in series;
the battery cell has a first resistance value;
the protection circuit has a second resistance value;
the second resistance value increases with increasing temperature.
Optionally, the second resistance of the protection circuit increases in a stepwise manner with an increase in temperature, each stepwise resistance corresponds to a temperature range, and when the temperature reaches a preset value, the second resistance tends to be infinite, and the protection circuit is open.
Optionally, the protection circuit includes at least a first circuit and a second circuit connected in parallel;
the first circuit and/or the second circuit is a circuit which changes the connection state along with the change of the environmental temperature;
when the first circuit is in a first connection state, a first branch of the first circuit is connected, and a second branch of the first circuit is disconnected;
when the first circuit is in a second connection state, a first branch of the first circuit is disconnected, a second branch of the first circuit is connected, and the second branch of the first circuit comprises a thermistor;
the first connection state and the second connection state are automatically switched according to the ambient temperature, and the ambient temperature of the second connection state is greater than that of the first connection state.
Optionally, the protection circuit includes an input terminal and an output terminal, and the first circuit includes a switch;
in a first connection state of the first circuit, two ends of the switch are respectively connected with the input end and the output end, the first end of the thermistor is a free end, and the second end of the thermistor is connected with the input end or the output end.
Optionally, the first circuit comprises a bimetal;
in the second connection state of the first circuit, the bimetallic strip and the thermistor are connected in series between the input end and the output end.
Optionally, in a first connection state of the second circuit, a first branch of the second circuit is turned on, and a second branch of the second circuit is turned off;
in a second connection state of the second circuit, a first branch of the second circuit is disconnected, a second branch of the second circuit is connected, and the second branch of the second circuit comprises a thermistor;
the first connection state and the second connection state of the second circuit are automatically switched according to the ambient temperature, and the ambient temperature of the second connection state of the second circuit is greater than that of the connection state of the second circuit.
Optionally, the second circuit comprises a bimetallic strip switch;
in a first connection state of the second circuit, the bimetallic strip switch is closed;
in a second connected state of the second circuit, the bimetal switch is open.
Optionally, the protection circuit includes an input terminal and an output terminal, and further includes:
a third circuit that changes a connection state with a change in ambient temperature;
the first end of the third circuit is a free end, and the second end of the third circuit is connected with the input end or the output end;
in a second connection state of the second circuit, the bimetallic strip switch is connected with a free end of the third circuit;
in a first connection state of the third circuit, a first branch of the third circuit is on, and a second branch of the third circuit is off;
in a second connection state of the third circuit, a first branch of the third circuit is disconnected, a second branch of the third circuit is connected, and the second branch of the third circuit comprises a thermistor;
the first connection state and the second connection state of the third circuit are automatically switched according to the ambient temperature, and the ambient temperature of the second connection state of the third circuit is higher than the ambient temperature of the first connection state of the third circuit.
An electronic device comprising any of the above battery systems.
Optionally, the electronic device is a notebook computer, a mobile phone or a PAD.
Compared with the prior art, the embodiment of the application discloses a battery system, which comprises a battery cell and a protection circuit, wherein the battery cell is connected with the protection circuit in series, the battery cell has a first resistance value, the protection circuit has a second resistance value, and the second resistance value is increased along with the rise of temperature. When the environmental temperature of the battery system is continuously increased, the resistance value of the protection circuit is also continuously increased, so that the current passing through the protection circuit, namely the current passing through the battery cell is reduced, the heat generation of the battery system is reduced, and the temperature is prevented from being rapidly increased to be thermally out of control; the resistance value of the protection circuit is increased along with the change of the ambient temperature, and the protection circuit is not broken when the temperature reaches a certain value and tends to infinity at one time, so that the battery system has certain tolerance to the ambient temperature, the internal current is gradually reduced while the ambient temperature is continuously increased, and the thermal runaway condition is effectively avoided on the premise that the open-circuit protection cannot be easily triggered.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a battery system disclosed in an embodiment of the present application;
FIG. 2 is a schematic diagram of TCO protection principles disclosed in an embodiment of the present application;
fig. 3 is a circuit structure diagram of a protection circuit disclosed in an embodiment of the present application;
fig. 4 is a circuit configuration diagram of another protection circuit disclosed in the embodiment of the present application;
FIG. 5 is a schematic structural diagram of another protection circuit disclosed in the embodiment of the present application;
fig. 6 is a schematic diagram of a working principle process of a protection circuit disclosed in the embodiment of the present invention;
FIG. 7 is a schematic diagram of a resistance-temperature variation curve corresponding to the process shown in FIG. 6 according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Fig. 1 is a schematic structural diagram of a battery system disclosed in an embodiment of the present application, and referring to fig. 1, the battery system 10 includes a battery cell 20 and a protection circuit 30. The battery cell 20 has a first resistance value R1, and the protection circuit 30 has a second resistance value R2, which increases with increasing temperature.
The first resistance R1 may be a direct current resistance of the battery cell 20.
The specific structure of the protection circuit 30 may have a variety of implementation forms, and in this embodiment, the structure of the protection circuit 30 is not specifically limited, and it only needs to ensure that the second resistance value R2 of the protection circuit 30 can be gradually increased along with the increase of the temperature. In the following embodiments, specific structures of the protection circuit 30 will be exemplarily described, and will not be excessively stated herein.
Specifically, the second resistance value R2 of the protection circuit 30 increases with the increase of temperature, and is not similar to some existing thermistors, and when the temperature is low, the current can normally pass through the thermistors, and when the temperature reaches a certain value, the resistance value suddenly increases to infinity, so that the current of the path is unnecessarily reduced to be close to 0. In this embodiment, the second resistance R2 of the protection circuit 30 does not suddenly increase to infinity with the increase of the temperature, but gradually increases step by step, so that the current passing through the electrical core 20 connected in series with the protection circuit 30 also gradually decreases, rather than decreases to 0 at a time.
In the battery system of this embodiment, while the ambient temperature continuously increases, the resistance value of the protection circuit also continuously increases, so that the current passing through the protection circuit, that is, the current passing through the battery cell, is gradually reduced, the heat generation of the battery system is reduced, and the temperature is prevented from rising too fast and developing into thermal runaway; because the resistance value of the protection circuit is increased along with the change of the ambient temperature, and the protection circuit does not tend to be infinite once when the temperature reaches a certain specific value and then is disconnected, the battery system has certain tolerance to the ambient temperature, the internal current is gradually reduced while the ambient temperature is continuously increased, and the thermal runaway condition is effectively avoided on the premise that the open circuit protection cannot be easily triggered.
It has been described in the above embodiment that the second resistor R2 of the protection circuit 30 may increase with the increase of temperature, and specifically, the implementation form may include: the second resistance value R2 of the protection circuit 30 increases in a stepwise manner with an increase in temperature, each stepwise resistance value corresponds to a temperature range, and when the temperature reaches a preset value, the second resistance value tends to be infinite, and the protection circuit is open.
For example, the resistance of the second resistor R2 of the protection circuit 30 is 5 ohms at 15-30 degrees celsius, the resistance of the second resistor R2 of the protection circuit 30 is 15 ohms at 30-40 degrees celsius, the resistance of the second resistor R2 of the protection circuit 30 is 80 ohms at 40-50 degrees celsius, and the resistance of the second resistor R2 of the protection circuit 30 tends to be infinite at more than 50 degrees celsius. Of course, the example described here is only for the purpose of understanding the process of the second resistance value R2 increasing stepwise with the increase of temperature, and the values in the above example are not meaningful in practical applications.
A TCO (thermal cut-Pff) protection structure may be included in the protection circuit 30. The TCO protection principle is a switching device based on a bimetallic strip Bi-metal. Fig. 2 is a schematic diagram of TCO protection, and in conjunction with fig. 2, when the Temperature or current is low, the bimetal assumes an initial bending state, the metal arm is connected to the circuit as a small resistor (mohm level), and the PTC (Positive Temperature Coefficient, which may be understood as a thermistor) and the bimetal are in an open circuit state and are not connected to the circuit; when the temperature or the current reaches a certain value, because the thermal expansion coefficients of two metals in the bimetallic strip are different, the bimetallic strip can reverse and bounce off the metal arm, so that the metal arm is broken, and meanwhile, the bimetallic strip can be connected with the PTC to form a loop, and at the moment, the current of the battery is reduced to the mA level. When the current temperature is reduced to a certain value, the bimetallic strip is restored to the original bending state.
Of course, the TCO protection structure is only an illustrative example, and in practical applications, some electrical components may be used together with a certain circuit design to achieve the technical purpose that the second resistance value R2 increases with the increase of temperature. In this embodiment, the second resistance of the protection circuit increases in a stepwise manner with the rise of temperature, so that the current passing through the battery core also decreases in a stepwise manner, thereby reducing the heat generated by the system, and effectively avoiding the thermal runaway condition on the premise that the open-circuit protection cannot be easily triggered.
In a specific implementation, a specific structure of the protection circuit 30 may be as shown in fig. 3, where fig. 3 is a circuit structure diagram of a protection circuit disclosed in an embodiment of the present application, and as shown in fig. 3, the protection circuit 30 at least includes: a first circuit 31 and a second circuit 32 connected in parallel.
Wherein the first circuit 31 and/or the second circuit 32 are circuits that change connection state with a change in ambient temperature.
In a first connection state of the first circuit, a first branch of the first circuit 31 is on;
in a second connection state of the first circuit, the first branch of the first circuit 31 is open;
the second branch comprises a thermistor PTC 1;
the first connection state and the second connection state are automatically switched according to the ambient temperature, and the ambient temperature of the second connection state is greater than the ambient temperature of the first connection state.
In a specific implementation, the first circuit 31 or the second circuit 32 alone may change a connection state with a change of an ambient temperature, or both the first circuit 31 and the second circuit 32 may change their connection states with a change of an ambient temperature. It should be noted that, if both the first circuit 31 and the second circuit 32 can change their connection states with the change of the environmental temperature, the temperature values corresponding to the connection states changed by the first circuit 31 and the second circuit 32 are different.
Specifically, the protection circuit 30 may include an input terminal and an output terminal, and the first circuit 31 includes a switch, wherein the switch may be a bimetal switch K1;
in the first connection state of the first circuit 31, two ends of the bimetal switch K1 are respectively connected to the input end and the output end, and two ends of the thermistor PTC are respectively connected to the input end and the output end.
In the second connection state of the first circuit 31, the bimetal switch K1 springs open, and the first branch of the first circuit is disconnected.
In this embodiment, the first circuit 31 may comprise two branches, the first branch of the first circuit being turned on by a bimetal switch K1 in the first connection state; in a second connection state, the first branch of the first circuit is disconnected; the second branch comprises a thermistor PTC 1; the second circuit 32 comprises a bimetallic strip switch K2, the bimetallic strip K2 switch being closed in the first connection state of the second circuit 32; in its second connected state of the second circuit 32, the bimetallic strip switch K2 is open. It should be noted that the bimetal switch K2 may be empty after being turned off, that is, no line is connected, or other lines may be connected.
Referring to fig. 3, when the temperature is low, the bimetal K1 is closed, and the first branch is conducted (first connection state); when the temperature reaches a certain value, the bimetallic strip switch K1 is deformed by heat and springs to disconnect from the first branch of the first circuit 31. Since the second branch includes the thermistor PTC1, the higher the temperature is, the larger the resistance of the thermistor PTC1 is, the larger the resistance of the first circuit 31 becomes; since the first circuit 31 and the second circuit 32 are connected in parallel, when the resistance of the first circuit 31 is increased, the resistance of the whole protection circuit 30 is increased, and the current passing through the whole protection circuit is decreased, thereby reducing the heat generation of the system.
In this embodiment, the deformation temperature value of the bimetal switch K2 may be greater than the deformation temperature value of the bimetal switch K1, so that after the resistance value of the first circuit 31 becomes large, the protection circuit 30 becomes small as a whole through current, and when the temperature continues to rise to a certain value, the bimetal switch K2 of the second circuit 32 also deforms by heat, bounces off to be disconnected with the second circuit, and then the overall resistance of the protection circuit becomes larger, and the overall through current becomes smaller.
Fig. 4 is a circuit structure diagram of another protection circuit disclosed in an embodiment of the present application, and referring to fig. 4, in another implementation manner, a specific structure of the second circuit 32 may be the same as that of the first circuit 31 in fig. 3, so that in a first connection state of the second circuit, a first branch of the second circuit is turned on; in a second connection state of the second circuit, a first branch of the second circuit is disconnected; a second branch of the second circuit includes a thermistor PTC 2; the first connection state and the second connection state of the second circuit are automatically switched according to the ambient temperature, and the ambient temperature of the second connection state of the second circuit is greater than that of the connection state of the second circuit.
In this embodiment, the bimetallic switch K1 in the first circuit 31 and the bimetallic switch K2 in the second circuit have different thermal deformation temperatures. For example, the temperature value of the thermal deformation of the bimetal switch K2 is greater than that of the thermal deformation of the bimetal switch K1, so that when the ambient temperature rises to a certain value, the bimetal switch K1 in the first circuit 31 is deformed and bounced off by heat, and the first branch of the first circuit 31 is disconnected; when the ambient temperature continues to rise to another value, the bimetal switch K2 in the second circuit 32 is deformed by heat and bounces open, and the first branch of the second circuit 32 is also broken.
Therefore, the resistance value of the protection circuit is approximately in a step-type increasing state along with the temperature rise instead of being changed from a low resistance value to infinity at one time, so that the battery system has certain tolerance to the ambient temperature, the internal current is gradually reduced while the ambient temperature is continuously raised, and the thermal runaway condition is effectively avoided on the premise that the open circuit protection cannot be easily triggered.
Fig. 5 is a schematic structural diagram of another protection circuit disclosed in an embodiment of the present application, and referring to fig. 5, based on the protection circuit shown in fig. 3, the protection circuit includes an input terminal and an output terminal, and further includes:
a third circuit 33, the third circuit 33 being a circuit that changes a connection state with a change in ambient temperature;
the first end of the third circuit 33 is a free end, and the second end is connected to the input end or the output end;
in its second connection state, the bimetallic strip switch K2 is connected to the free end of the third circuit 33 of the second circuit 32;
in its first connected state of the third circuit 33, a first branch of the third circuit 33 is conductive;
in its second connected state of the third circuit 33, the first branch of the third circuit 33 is open;
the second branch of the third circuit 33 comprises a thermistor PTC 3;
the first connection state and the second connection state of the third circuit 33 are automatically switched according to the ambient temperature, and the ambient temperature of the second connection state of the third circuit 33 is greater than the ambient temperature of the first connection state.
The specific structure of the third circuit 33 is the same as that of the first circuit 31, and the first branch of the third circuit 33 includes a bimetal switch K3. Although the specific structure of the third circuit 33 is the same as that of the first circuit 31, the functions of the two circuits in the protection circuit 30 are not equivalent.
Fig. 6 is a schematic diagram illustrating a working principle and process of a protection circuit according to an embodiment of the present invention, wherein a is an original state diagram, which is the same as fig. 5; FIG. 7 is a graph illustrating resistance versus temperature curves corresponding to the process shown in FIG. 6 according to an embodiment of the present invention; assuming that the temperature value of the thermal deformation of the bimetallic strip switch K1 is greater than the temperature value of the thermal deformation of the bimetallic strip switch K3, the temperature value of the thermal deformation of the bimetallic strip switch K3 is greater than the temperature value of the thermal deformation of the bimetallic strip switch K2, namely K1 is greater than K3 is greater than K2, and assuming that the resistance value of K1 is R k1 The resistance value of K2 is R k2 The resistance value of K3 is R k3 Referring to fig. 6 and 7, in the connection state shown in fig. 6 a, the resistance value R2 of the protection circuit 30 is equal to R k1 *R k2 /(R k1 +R k2 ) During the operation of the battery system 10, when the temperature slowly rises, the bimetal switch K2 in the second circuit 32 is first deformed and bounces off and is connected to the third circuit 33 (corresponding to the diagram B in fig. 6), so that the second circuit 32 is turned off, the third circuit is turned on through the bimetal switch K2, and the overall resistance of the protection circuit 30, that is, the second resistor R2 is R2 k1 *(R k2 +R k3 )/(R k1 +R k2 +R k3 ) The R2 is increased, and the overall current flowing through the protection circuit 30 is decreased; as the ambient temperature continues to rise, the bimetal switch K3 in the third circuit 33 deforms and springs open, the first branch of the third circuit 33 is opened (corresponding to diagram C in fig. 6), and the overall resistance R2 ═ R of the protection circuit 30 k1 Accordingly, the R2 becomes larger, and the overall protection circuit 30 becomes smaller by the current; as the ambient temperature continues to rise, the bimetal switch K1 in the first circuit 31 is deformed by heat and bounces open (corresponding to the diagram D in fig. 6), the overall resistance value of the protection circuit 30 becomes larger and tends to be infinite, the overall current of the protection circuit 30 becomes smaller until it becomes 0, and the protection circuit is completely broken.
Therefore, the resistance value of the protection circuit is in a step-type increasing state along with the rise of the temperature, and is not changed from a low resistance value to infinity at one time, so that the battery system has certain tolerance to the ambient temperature, the internal current is gradually reduced while the ambient temperature is continuously raised, and the thermal runaway condition is effectively avoided on the premise that the open-circuit protection cannot be easily triggered.
It should be noted that, the various structures of the protection circuit disclosed in the above embodiments only include the most basic circuit elements, and in specific applications, other circuit elements, such as resistors, may be added to the circuit according to actual requirements, and only need to ensure that the normal implementation of the technical idea disclosed in the present application is not affected.
In addition, the structures of the protection circuits described in the above embodiments are different implementations of the protection circuits in different applications, and are not limited to the specific structures of the protection circuits. According to actual requirements, the specific structure of the device can be correspondingly designed. Modifications and variations of the protection circuit are within the scope of the present disclosure without departing from the inventive concepts thereof.
Further, the present application also discloses an electronic device including any one of the battery systems disclosed in the above embodiments. The battery system of the electronic equipment at least comprises a battery cell and a protection circuit;
wherein the battery cell and the protection circuit are connected in series;
the battery cell has a first resistance value;
the protection circuit has a second resistance value;
the second resistance value increases with increasing temperature.
When the environmental temperature of the electronic equipment is continuously increased, the resistance value of the protection circuit is also continuously increased, so that the current passing through the protection circuit, namely the current passing through the battery core is reduced, the heat generation of a battery system is reduced, and the temperature is prevented from being rapidly increased to be thermally out of control; the resistance value of the protection circuit is increased along with the change of the ambient temperature, and is not broken when the temperature reaches a certain specific value and tends to infinity at one time, so that the battery system has certain tolerance to the ambient temperature, the internal current is gradually reduced while the ambient temperature is continuously increased, the thermal runaway condition is effectively avoided on the premise that the open-circuit protection cannot be easily triggered, and the use safety of the electronic equipment is ensured.
In the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A battery system comprises a battery core and a protection circuit;
the battery cell is connected with the protection circuit in series;
the battery cell has a first resistance value;
the protection circuit has a second resistance value;
wherein the protection circuit includes: the first circuit and the second circuit are connected in parallel, and the first circuit and/or the second circuit are/is a circuit which changes the connection state along with the change of the ambient temperature;
in a first connection state of the first circuit, a first branch of the first circuit is connected, in a second connection state of the first circuit, the first branch of the first circuit is disconnected, and the second branch comprises a thermistor; the first connection state and the second connection state are automatically switched according to the ambient temperature, and the ambient temperature of the second connection state is higher than that of the first connection state;
the protection circuit further comprises an input end, an output end and a third circuit, wherein the third circuit changes the connection state along with the change of the environmental temperature, the first end of the third circuit is a free end, the second end of the third circuit is connected with the input end or the output end, and the bimetallic strip switch of the second circuit is communicated with the free end of the third circuit in the second connection state of the second circuit;
the first branch of the third circuit is conducted when the third circuit is in the first connection state, the first branch of the third circuit is disconnected when the third circuit is in the second connection state, the second branch of the third circuit comprises a thermistor, the first connection state and the second connection state of the third circuit are automatically switched according to the ambient temperature, the ambient temperature of the second connection state of the third circuit is higher than the ambient temperature of the first connection state of the third circuit, and the disconnection time of the first branch of the first circuit, the disconnection time of the bimetallic strip of the second circuit and the disconnection time of the first branch of the third circuit are different.
2. The battery system according to claim 1, wherein the second resistance of the protection circuit increases stepwise with an increase in temperature, each stepwise resistance corresponds to a temperature range, and when the temperature reaches a preset value, the second resistance tends to be infinite, and the protection circuit is open.
3. The battery system of claim 1, the protection circuit comprising an input and an output, the first circuit comprising a switch;
when the first circuit is in a first connection state, two ends of a switch of the first circuit are respectively connected with the input end and the output end, and two ends of the thermistor are respectively connected with the input end and the output end.
4. The battery system of claim 3, wherein the switch of the first circuit is a bimetallic switch;
in the second connection state of the first circuit, the bimetallic strip switch of the first circuit is flicked, and the first branch of the first circuit is disconnected.
5. The battery system of claim 1, the second circuit in its first connected state, a first branch of the second circuit being on;
in a second connection state of the second circuit, the first branch of the second circuit is disconnected;
a second branch of the second circuit comprises a thermistor;
the first connection state and the second connection state of the second circuit are automatically switched according to the ambient temperature, and the ambient temperature of the second connection state of the second circuit is greater than that of the first connection state of the second circuit.
6. The battery system of claim 1, the second circuit comprising a bimetallic switch;
in a first connection state of the second circuit, the bimetallic strip switch is closed;
in its second connected state, the bimetal switch is open.
7. An electronic device comprising the battery system of any one of claims 1-6.
8. The electronic device of claim 7, being a laptop, a cell phone, or a PAD.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910254406.5A CN109818111B (en) | 2019-03-31 | 2019-03-31 | Battery system and electronic equipment |
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| CN201910254406.5A CN109818111B (en) | 2019-03-31 | 2019-03-31 | Battery system and electronic equipment |
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| CN109818111B true CN109818111B (en) | 2022-07-26 |
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| CN2638232Y (en) * | 2003-06-03 | 2004-09-01 | 上海科特高分子材料有限公司 | Self-restoring over-current protective combined device |
| CN201112465Y (en) * | 2007-10-10 | 2008-09-10 | 陈振富 | Lead-acid accumulator with temperature and voltage protection |
| CN103380555A (en) * | 2010-12-16 | 2013-10-30 | 泰科电子日本合同会社 | Protective device |
| CN102646547A (en) * | 2012-04-23 | 2012-08-22 | 东莞市晶品电子科技有限公司 | Protector for lithium ion battery |
| CN203951175U (en) * | 2014-06-03 | 2014-11-19 | 福建万众百源实业有限公司 | A kind of based on PTC protective circuit on lithium battery protection board |
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| CN109818111A (en) | 2019-05-28 |
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