CN210467972U - Short-circuit device for battery over-temperature protection and battery with over-temperature protection function - Google Patents
Short-circuit device for battery over-temperature protection and battery with over-temperature protection function Download PDFInfo
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- CN210467972U CN210467972U CN201920775986.8U CN201920775986U CN210467972U CN 210467972 U CN210467972 U CN 210467972U CN 201920775986 U CN201920775986 U CN 201920775986U CN 210467972 U CN210467972 U CN 210467972U
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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 utility model relates to the technical field of battery circuits, in particular to a battery over-temperature protection short circuiter and a battery with over-temperature protection function, wherein the short circuiter comprises an A end and a B end which are electrically connected, and comprises an elastic piece, a first magnetic induction piece and a second magnetic induction piece, one end of the elastic piece is connected with the second magnetic induction piece, the other end is relatively fixed, the second magnetic induction piece and the first magnetic induction piece mutually attract and compress the elastic piece to enable the A end of the short circuiter to be positioned at a first position; when the temperature of the battery exceeds a preset value, the magnetism of the first magnetic induction piece and/or the second magnetic induction piece disappears, and the elastic piece recovers and deforms to enable the end A of the short-circuiting device to be located at the second position. When the A end of the short-circuiting device is positioned at the second position, the A end of the short-circuiting device is electrically connected with the negative pole of the battery, so that a short circuit is formed between the positive pole and the negative pole, and the battery is prevented from being charged and discharged continuously. Compared with the existing mode of generating gas through electrolyte to trigger CID overturning, the short-circuiting device is triggered more sensitively and timely.
Description
Technical Field
The utility model relates to a battery circuit technical field, concretely relates to a battery that is used for short-circuit device of battery excess temperature protection and has excess temperature protect function.
Background
With the increasing severity of energy crisis and environmental pollution problems, new energy vehicles are more and more favored by various countries by virtue of the great advantages in energy conservation and emission reduction. The electric automobile is the main body of the new energy automobile at present, and the power battery is the most important power source of the electric automobile. Lithium ion batteries are becoming the mainstream of power batteries for electric vehicles due to their high specific energy and long service life. However, the safety accident of the lithium ion battery which is characterized by the thermal runaway of the monomer occurs sometimes, and the large-scale application of the electric automobile is limited.
Thermal runaway refers to the phenomenon that the battery temperature rises uncontrollably due to the chain reaction of the battery monomer. Under the normal use condition, the battery temperature rise is less, can not take place the danger of thermal runaway. When the battery is in an abnormal working condition, such as overcharge, overdischarge, and use in a high-heat environment, the electrode material and the electrolyte generate corresponding side reactions and generate heat, and simultaneously, the internal resistance of the battery rises and ohmic heat is generated, so that the temperature of the battery rises at a certain rate. The electrode material and the electrolyte can accelerate the reaction rate to emit a large amount of heat at higher and higher temperatures, so that vicious circle is generated, the temperature of the battery is uncontrollably increased, and finally the battery is ignited and exploded to generate thermal runaway.
In the prior art, in order to prevent the battery from causing serious safety problems when thermal runaway occurs in the rectangular battery, the rectangular battery is generally designed with a safety valve and a current cut-off device cid (critical innovative preparation). When the battery temperature is in the abnormal condition, the battery is inside because electrode material and electrolyte take place to react and produce a large amount of gases for battery internal pressure lasts and rises, and when reaching CID's upset pressure, the CID shell fragment can upwards overturn, and the short circuit takes place for positive and negative pole post through battery top cap bottom plate, and the heavy current of production fuses anodal insurance Fuse, thereby prevents that the battery from continuing to charge, discharging in order to play the guard action. However, CID rollover is related to the internal pressure of the battery, i.e., the gas production rate inside the battery, and therefore triggering of CID rollover is not very timely and sensitive. Often, when the CID is turned over, the internal temperature of the battery is high and approaches the critical triggering state of thermal runaway, and the battery is still dangerous.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem that the current cut-off device is not triggered timely among the prior art, the application provides a short-circuit device for battery excess temperature protection and a battery with excess temperature protection function, specifically includes following technical scheme:
a short-circuit device for battery over-temperature protection comprises an A end and a B end which are electrically connected, the short-circuit device comprises an elastic piece, a first magnetic induction piece and a second magnetic induction piece, at least one of the first magnetic induction piece and the second magnetic induction piece has magnetism, and the other one can be attracted by magnetism; one end of the elastic piece is connected with the second magnetic induction piece, and the other end of the elastic piece is relatively fixed;
the second magnetic induction piece and the first magnetic induction piece attract each other to compress the elastic piece, so that the A end of the short-circuit device is located at a first position; when the temperature of the battery exceeds a preset value, the magnetism of the first magnetic induction piece and/or the second magnetic induction piece is weakened or disappears, the elastic piece recovers and deforms to enable the end A of the short-circuit device to be located at the second position and used for being electrically connected with the first pole column of the battery, the end B of the short-circuit device is used for being electrically connected with the second pole column of the battery, and the electrical property of the first pole column is opposite to that of the second pole column. When the end A of the short-circuit device is located at the second position, the end A of the short-circuit device is electrically connected with the first pole column of the battery, and the end B of the short-circuit device is electrically connected with the second pole column of the battery, so that a short circuit is formed between the first pole column and the second pole column of the battery, and the generated large circuit can fuse the positive electrode fuse to play a role of overheat protection.
The elastic part is a conductor, one end of the elastic part, which is close to the second magnetic induction part, is an A end of the short circuit device, one end of the elastic part is used for being electrically connected with a first pole column of a battery when being positioned at a second position, the other end of the elastic part is a B end of the short circuit device, and the other end of the elastic part is used for being electrically connected with a second pole column of the battery;
or, the elastic member and the first magnetic induction member are both conductors, one end of the elastic member is electrically connected with the first magnetic induction member, the other end of the elastic member is the end a of the short circuit device, the other end of the elastic member is used for being electrically connected with a first pole of a battery when located at a second position, the first magnetic induction member is the end B of the short circuit device, and the first magnetic induction member is used for being electrically connected with a second pole of the battery;
or, the elastic member and the second magnetic induction member are both conductors, one end of the elastic member is electrically connected with the second magnetic induction member, the second magnetic induction member is the end a of the short circuit device, the second magnetic induction member is used for being electrically connected with the first pole of the battery when located at the second position, the other end of the elastic member is the end B of the short circuit device, and the other end of the elastic member is used for being electrically connected with the second pole of the battery;
or the elastic element, the first magnetic induction element and the second magnetic induction element are all conductors, two ends of the elastic element are respectively and electrically connected with the first magnetic induction element and the second magnetic induction element, the second magnetic induction element is the end A of the short circuit device, the second magnetic induction element is used for being electrically connected with a first pole of a battery when in a second position, the first magnetic induction element is the end B of the short circuit device, and the first magnetic induction element is used for being electrically connected with a second pole of the battery;
or, the elastic component, the first magnetic component and the second of feeling are felt and are the conductor, the one end of elastic component with the second is felt magnetism and is connected, just first magnetic component and second magnetic component are connected through flexible conductive piece, the second is felt magnetism and is done short circuit device's A end, the second is felt magnetism and is used for being connected with the first utmost point post electricity of battery when being located the second position, the other end and the first magnetic component that feels of elastic component do short circuit device's B end, the other end and the first magnetic component that feels of elastic component are used for being connected with the second utmost point post electricity of battery.
Preferably, one of the first magnetic sensing piece and the second magnetic sensing piece is a temperature sensing soft magnet, the other is a permanent magnet, an iron block or an electromagnet, the temperature sensing soft magnet has the characteristic of high-temperature demagnetization, when the temperature in the battery does not reach a preset value, the first magnetic sensing piece and the second magnetic sensing piece attract each other, so that one end of the short circuit device is located at the first position, the first pole column and the second pole column are not conducted, when the temperature in the battery reaches the preset value, the magnetism of the temperature sensing soft magnet disappears, one end of the short circuit device is located at the second position under the action of the elastic piece, the first pole column and the second pole column are conducted, and the short circuit effect is achieved.
Furthermore, the magnetic induction device further comprises an insulating guide part, wherein a hollow guide cylinder is formed inside the insulating guide part and used for guiding the second magnetic induction part when the second magnetic induction part moves.
The elastic piece is a cylindrical spring, the elasticity of the cylindrical spring is large, the recovery deformation capacity is strong, and the elastic piece can be sleeved on the first magnetic induction piece to achieve the effect of relative positioning.
The first magnetic induction piece and the second magnetic induction piece are both cylindrical, the insulating guide piece is cylindrical, the inner wall of the insulating guide piece is smooth, and friction between the second magnetic piece and the insulating guide piece can be reduced in the guiding process.
The diameter of the inner ring of the spring is larger than that of the first magnetic induction piece, the spring is sleeved on the first magnetic induction piece, and the first magnetic induction piece has a positioning effect on the spring to prevent the position of the spring from moving.
The flexible conductive piece is one of a copper wire, an aluminum wire, a copper foil or an aluminum foil, and the copper material and the aluminum material have certain flexibility and are good in conductive effect.
A battery with an over-temperature protection function comprises the short-circuit device, a battery top cover bottom plate, a first pole and a second pole, wherein the first pole and the second pole are arranged on the battery top cover bottom plate;
the elastic piece and the second magnetic induction piece are both conductors and are electrically connected, the second magnetic induction piece is electrically connected with the first pole of the battery when located at the second position, and the lower end of the elastic piece is electrically connected with the second pole of the battery; or the first magnetic induction piece and the second magnetic induction piece are both conductors and are electrically connected through the flexible conductive piece, the second magnetic induction piece is electrically connected with the first pole of the battery when located at the second position, and the first magnetic induction piece is electrically connected with the second pole of the battery; the first pole post and the second pole post are opposite in electrical property.
Further, the device also comprises a fuse arranged on a circuit between the first pole column and the second pole column. When the short-circuit device makes the short circuit between the first pole post and the second pole post of the battery, a large current fusing positive pole fuse is formed in the loop, so that the circuit is disconnected, and the overheating protection effect is achieved.
Further, still including setting up explosion-proof valve and notes liquid mouth on the battery top cap bottom plate, explosion-proof valve department is equipped with the explosion-proof valve screening glass. The explosion-proof valve is used for automatic pressure release when battery charge-discharge in-process inside gas pressure is too big, prevents to arouse the explosion, annotates the liquid mouth and is used for injecting into electrolyte to the battery, still is equipped with the explosion-proof valve screening glass in explosion-proof valve department for the explosion-proof valve is prevented to the explosion-proof valve by the outside sharp-pointed object of battery destruction.
According to the short-circuit device for battery over-temperature protection of the embodiment, the short-circuit device comprises the elastic piece, the first magnetic sensing piece and the second magnetic sensing piece, when the temperature in the battery does not exceed the preset value, the second magnetic sensing piece and the first magnetic sensing piece attract each other to compress the elastic piece, so that the second magnetic sensing piece is located at the first position, at the moment, the second magnetic sensing piece is disconnected with the first pole of the battery, when the temperature in the battery exceeds the preset value, the magnetism of the second magnetic sensing piece disappears, the elastic piece recovers and deforms, so that the second magnetic sensing piece is located at the second position, the second magnetic sensing piece is electrically connected with the first pole of the battery when the second magnetic sensing piece is located at the second position, at the moment, the first pole and the second pole are short-circuited, the generated large current can fuse, and the battery is prevented from being charged and discharged. The short-circuit device of this application compares with the current mode that produces gas through electrolyte and trigger CID upset, triggers sensitively more and timely, has avoided the emergence of the battery thermal runaway condition.
Drawings
Fig. 1 is a schematic view illustrating a state in which a short-circuiting device according to an embodiment of the present application is mounted on a battery;
fig. 2 is a schematic structural diagram of a short-circuit device according to an embodiment of the present application.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.
Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).
In the embodiment of the present invention, a square rechargeable lithium battery is taken as an example to illustrate the structure of the short-circuit device 20 of the present application, the battery includes a top cover bottom plate 10 and a positive pole 101 and a negative pole 105 disposed on the top cover bottom plate 10, the short-circuit device 20 of the present embodiment includes an elastic member 203, a first magnetic sensor 205 and a second magnetic sensor 202, the first magnetic sensor 205 is disposed on the top cover bottom plate 10 below the negative pole 105, and the second magnetic sensor 202 is disposed above the first magnetic sensor 205 through the support of the elastic member 203. The first magnetic sensing member 205 and the second magnetic sensing member 202 in the present application refer to an object that can sense a magnetic force, i.e., can be attracted by the magnetic force, such as a magnet, an electromagnet, an iron block, or a temperature-sensitive soft magnet.
At least one of the first magnetic induction piece 205 and the second magnetic induction piece 202 has magnetism, and the two pieces are attracted by magnetism. When the battery works normally, the magnetism of the first magnetism-sensing piece 205 or the second magnetism-sensing piece 202 is larger, so that the first magnetism-sensing piece 205 and the second magnetism-sensing piece 202 attract each other, and the second magnetism-sensing piece 202 compresses the elastic piece 203 to enable the upper end of the elastic piece to be far away from the negative pole 105; when the temperature in the battery exceeds a preset value, the magnetism of the first magnetic induction piece 205 or the second magnetic induction piece 202 is reduced or disappears, at the moment, the attraction force between the first magnetic induction piece 205 and the second magnetic induction piece 202 is reduced or disappears, the elastic piece 203 recovers and deforms, the second magnetic induction piece 202 is jacked up under the action of the elastic piece 203 to be in contact with the negative pole 105, a short circuit is formed between the positive pole 101 and the negative pole 105, and the generated large current can fuse the positive pole fuse, so that the battery is prevented from being charged and discharged continuously. Compared with the existing mode of generating gas through electrolyte to trigger CID overturning, the short-circuit device 20 provided by the embodiment is more sensitive and timely in triggering, and avoids the occurrence of thermal runaway of the battery.
The application provides a short-circuit device for battery excess temperature protection, when mainly used temperature exceeded the default in the battery for form the short circuit between positive post 101 and the negative pole post 105, the anodal insurance can be fused to the heavy current of production, thereby prevents that the battery from continuing to charge and discharge, plays excess temperature protection's effect to the battery.
Example 1:
referring to fig. 1 and 2, the present embodiment provides a short-circuit device for battery over-temperature protection, the short-circuit device includes two ends electrically connected to each other, and when short-circuited, the two ends of the short-circuit device are electrically connected to the positive pole and the negative pole of the battery respectively, so as to achieve the effect of short-circuit. Specifically, in the present embodiment, a square rechargeable lithium battery is taken as an example, the square rechargeable lithium battery includes a battery top cover bottom plate 10, and a positive post 101 and a negative post 105 disposed on the battery top cover bottom plate 10, the positive post 101 is mounted on the battery top cover bottom plate 10 through a first mounting post 107, the first mounting post 107 is a conductor, so that the battery top cover bottom plate 10 is electrically connected to the positive post 101, the negative post 105 is mounted on the battery top cover bottom plate 10 through a second mounting post 106, and the second mounting post 106 is an insulator, so that the negative post 105 is insulated from the battery top cover bottom plate 10. The short-circuit device 20 comprises an elastic member 203, a first magnetic induction member 205 and a second magnetic induction member 202, wherein the first magnetic induction member 205 is fixed on the battery top cover plate 10 below the negative pole 105, and the second magnetic induction member 202 is arranged above the first magnetic induction member 205 through the support of the elastic member 203.
In this embodiment, the elastic member 203, the first magnetic sensing member 205 and the second magnetic sensing member 202 are all conductors, one end of the elastic member 203 is electrically connected to the second magnetic sensing member 202, the first magnetic sensing member 205 and the second magnetic sensing member 202 are connected through a flexible conductive member, the second magnetic sensing member 202 is an end a of a short circuit device, the second magnetic sensing member 202 is used for being electrically connected to the negative pole 105 of the battery when located at the second position, the other end of the elastic member 203 and the first magnetic sensing member 205 are ends B of the short circuit device, and the other end of the elastic member 203 and the first magnetic sensing member 205 are used for being electrically connected to the positive pole 101 of the battery.
In this embodiment, the first magnetic sensing element 205 is a cylindrical permanent magnet, the second magnetic sensing element 202 is a cylindrical temperature-sensing soft magnet, the elastic element 203 is a cylindrical spring, the inner diameter of the elastic element 203 is slightly larger than the diameter of the first magnetic sensing element 205, and the inner diameter of the second magnetic sensing element 202 is slightly larger than the inner diameter of the elastic element 203. The lower end of the elastic member 203 is fixed on the battery top cover bottom plate 10, and the upper end thereof is fixedly connected with the bottom of the second magnetism sensing member 202. When the battery works normally and the temperature in the battery does not reach the preset value, the first magnetic induction piece 205 has larger magnetism, so that the first magnetic induction piece 205 and the second magnetic induction piece 202 are mutually attracted, and the second magnetic induction piece 202 compresses the elastic piece 203 to enable the upper end of the second magnetic induction piece to be far away from the negative pole 105; when the temperature in the battery exceeds the preset value, the preset value is the Curie temperature of the second magnetic induction piece 202, the battery temperature reaches the Curie temperature of the second magnetic induction piece 202, the second magnetic induction piece 202 disappears due to thermal magnetism, the attractive force between the first magnetic induction piece 205 and the second magnetic induction piece 202 disappears at the moment, the elastic piece 203 recovers deformation, the second magnetic induction piece 202 is jacked up under the action of the elastic piece 203 to be in contact with and electrically connected with the negative pole post 105, the elastic piece 203 is made of conductive metal in the embodiment, a short circuit is formed between the positive pole post 101 and the negative pole post 105, the generated large current fuses the positive pole fuse, and therefore the battery is prevented from being charged and discharged continuously. The short-circuit device 20 that this embodiment provided detects battery temperature change information and then arouses the action of elastic component 203 through second magnetism piece 202, and then plays the short-circuit effect, compares with the current mode that produces gas through electrolyte and trigger CID upset, triggers sensitively more and timely, has avoided the emergence of battery thermal runaway. In other embodiments, only the elastic member 203 may be sleeved on the first magnetism-sensing member 205, and the lower end of the elastic member 203 is not fixed, so that the elastic member 203 is relatively fixed due to the fact that the elastic member 203 is sleeved on the first magnetism-sensing member 205 in the process of attracting and compressing the elastic member 203 by the first magnetism-sensing member 205 and the second magnetism-sensing member 202 in the process of attracting and compressing the elastic member 203.
When the second magnetic induction member 202 is selected, it should be noted that the curie temperature of the second magnetic induction member cannot be too low or too high, the curie temperature should be higher than the upper limit temperature of the battery during normal use, and the maximum curie temperature should be lower than the thermal runaway trigger critical value of the battery, so that the short circuit device 20 can be triggered better. Wherein, the second magnetic induction part 202 can be selected from pure ferrite, magnetic steel and the like.
In other embodiments, one of the first magnetic sensing element 205 and the second magnetic sensing element 202 is a temperature-sensitive soft magnetic iron, and the other is an iron block or other conductive materials capable of being attracted by a magnet, so as to achieve the technical effects of the present application. For example, the first magnetic sensing element 205 is a temperature-sensitive soft magnet, the second magnetic sensing element 202 is an iron block, or the first magnetic sensing element 205 is an iron block, and the second magnetic sensing element 202 is a temperature-sensitive soft magnet; further alternatively, the first magnetic induction member 205 is a permanent magnet, and the second magnetic induction member 202 is a temperature-sensitive soft magnet.
In other embodiments, the elastic member 203 may also be made of an insulating material, and in order to ensure the electrical conductivity between the first magnetic sensing member 205 and the second magnetic sensing member 202, a flexible conductive member 204 is further disposed between the first magnetic sensing member 205 and the second magnetic sensing member 202, one end of the flexible conductive member 204 is fixed to the upper end of the first magnetic sensing member 205, and the other end is fixed to the lower end of the second magnetic sensing member 202, so that when the second magnetic sensing member 202 is jacked up to the second position under the action of the elastic member 203, the negative pole 105 is electrically connected to the positive pole 101 through the second magnetic sensing member 202, the flexible conductive member 204 and the first magnetic sensing member 205 in sequence, so as to short-circuit between the positive pole 101 and the negative pole 105.
The elastic component 203 adopts a conductive component, and the flexible conductive component 204 is arranged between the first magnetic sensing component 205 and the second magnetic sensing component 202, so that when the elastic component 203 is in poor contact with the battery top cover bottom plate 10 or the second magnetic sensing component 202, the flexible conductive component 204 can also play a role of conducting electricity, and a short circuit effect is achieved.
The flexible conductive device 204 of this embodiment is made of a copper wire, and other embodiments may also be made of flexible conductive materials such as an aluminum wire, a copper foil, or an aluminum foil, and the copper wire has certain flexibility and a good conductive effect.
Further, in order to ensure that the second magnetism sensing piece 202 moves vertically upward when being jacked up by the elastic piece 203 and ensure that the second magnetism sensing piece 202 is in contact with the negative pole 105, the lower end face of the negative pole 105 is further provided with the insulating guide 201, the insulating guide 201 of the embodiment is cylindrical, the diameter of the insulating guide 201 is slightly larger than that of the second magnetism sensing piece 202, the inner wall of the insulating guide 201 is smooth, when the second magnetism sensing piece 202 moves upward under the driving of the elastic piece 203, friction between the insulating guide 201 and the second magnetism sensing piece 202 is reduced due to the smooth inner wall of the insulating guide 201, and the second magnetism sensing piece 202 is convenient to move upward along the inside of the second magnetism sensing piece 202 to be in contact with the negative pole 105.
In addition, in other embodiments, the second magnetism sensing member 202 may also adopt an electromagnet, a temperature sensor is disposed inside the battery and used for detecting a temperature value inside the battery, and when the temperature value exceeds a preset value, the controller controls the electromagnet to lose power, so that the second magnetism sensing member 202 is in contact with the negative pole 105 for conduction.
Because the positive and negative poles of the square battery are different from those of the cylindrical battery in conduction, when the battery short-circuiting device 20 of the embodiment is applied to the cylindrical battery, the short-circuiting device 20 can be arranged below the positive pole, and can also realize the function of overheating short-circuiting.
Example 2:
in the present embodiment, a short-circuit device for battery over-temperature protection is provided, in which the first magnetic sensing element 205 is a temperature-sensitive soft magnet, and the second magnetic sensing element 202 is a permanent magnet, which are attracted by magnetism.
The elastic member 203 is a conductor, and the first magnetic induction member 205 and the second magnetic induction member 202 can be conductors or insulators. The second magnetism sensing piece 202 is arranged at one end of the elastic piece 203, the end part of the elastic piece 203 is not lower than the end part of the second magnetism sensing piece 202, one end of the elastic piece 203 close to the second magnetism sensing piece 202 is the A end of the short circuit device, and one end of the elastic piece 203 is used for being electrically connected with the negative pole 105 of the battery when being located at the second position; the first magnetic induction piece 205 is arranged at the other end of the elastic piece 203, the end part of the elastic piece 203 is not lower than the end part of the first magnetic induction piece 205, the other end of the elastic piece 203 is the B end of the short-circuit device, and the other end of the elastic piece 203 is used for being electrically connected with the second pole of the battery.
When the internal temperature of the battery does not exceed the preset value, the second magnetic induction piece 202 and the first magnetic induction piece 205 are mutually attracted due to magnetic force, so that the end A of the short-circuit device is located at the first position, namely, one end of the elastic piece 203, which is close to the second magnetic induction piece 202, is located at the first position, and at the moment, the end A and the end B of the short-circuit device are disconnected; when the internal temperature of the battery exceeds a preset value, the magnetism of the second magnetic induction piece 202 disappears, the elastic piece 203 recovers deformation, the second magnetic induction piece 202 drives one end of the elastic piece 203 to move to a second position under the action of the elastic piece 203, so that the elastic piece 203 is electrically connected with the negative pole post 105, the other end of the elastic piece 203 is electrically connected with the positive pole post 101, a short circuit is formed between the positive pole post 101 and the negative pole post 105 of the battery, a high-current fusing positive pole fuse is formed in a loop, and the overheating protection effect is achieved.
Example 3:
in the present embodiment, a short-circuit device for battery over-temperature protection is provided, in which the first magnetic sensing element 205 is a temperature-sensitive soft magnet, and the second magnetic sensing element 202 is a permanent magnet, which are attracted by magnetism.
The elastic member 203 and the first magnetic sensing member 205 are both conductors, one end of the elastic member 203 is electrically connected with the first magnetic sensing member 205, the second magnetic sensing member 202 is arranged at the other end of the elastic member 203, the end part of the elastic member 203 is not lower than the second magnetic sensing member 202, the other end of the elastic member 203 is an a end of a short circuit device, the other end of the elastic member 203 is used for being electrically connected with the negative pole 105 of the battery when being located at the second position, the first magnetic sensing member 205 is arranged at the other end of the elastic member 203 and electrically connected with the other end, and the first magnetic sensing member 205 is an B end of the short circuit device and is used for being electrically connected with the second pole of the battery.
When the internal temperature of the battery does not exceed the preset value, the second magnetic induction piece 202 and the first magnetic induction piece 205 are attracted with each other due to the magnetic force, so that the end a of the short circuit device is located at the first position, namely, one end of the elastic piece 203, which is close to the second magnetic induction piece 202, is located at the first position, and at the moment, the two ends of the short circuit device are disconnected; when the internal temperature of the battery exceeds a preset value, the magnetism of the second magnetic induction piece 202 disappears, the elastic piece 203 recovers deformation, the second magnetic induction piece 202 drives one end of the elastic piece 203 to move to a second position under the action of the elastic piece 203, so that the elastic piece 203 is electrically connected with the negative pole column 105, the first magnetic induction piece 205 is electrically connected with the positive pole column 101 of the battery, so that the positive pole column 101 and the negative pole column 105 of the battery are short-circuited, a high-current fusing positive pole fuse is formed in a loop, and an overheating protection effect is achieved.
Example 4:
in the present embodiment, a short-circuit device for battery over-temperature protection is provided, the short-circuit device 20 includes an elastic member 203, a first magnetic sensing member 205 and a second magnetic sensing member 202, wherein the first magnetic sensing member 205 is a temperature-sensitive soft magnet, and the second magnetic sensing member 202 is a permanent magnet, which are attracted by magnetism.
The elastic piece 203 and the second magnetic induction piece 202 are both conductors, one end of the elastic piece 203 is electrically connected with the second magnetic induction piece 202, the second magnetic induction piece 202 is an end A of the short-circuit device, the second magnetic induction piece 202 is used for being electrically connected with the negative pole 105 of the battery when located at the second position, the other end of the elastic piece 203 is an end B of the short-circuit device, the first magnetic induction piece 205 is arranged at the other end of the elastic piece 203, the end part of the elastic piece 203 is not lower than the end part of the first magnetic induction piece 205, and the other end of the elastic piece 203 is used for being electrically connected with the positive pole 101 of the battery.
When the internal temperature of the battery does not exceed the preset value, the second magnetic induction piece 202 and the first magnetic induction piece 205 are attracted with each other due to magnetic force, so that the end a of the short-circuit device is located at the first position, namely the second magnetic induction piece 202 is located at the first position, and at the moment, the two ends of the short-circuit device are disconnected; when the internal temperature of the battery exceeds a preset value, the magnetism of the second magnetism sensing piece 202 disappears, the elastic piece 203 recovers deformation, the second magnetism sensing piece 202 moves to a second position under the action of the elastic piece 203, so that the second magnetism sensing piece 202 is electrically connected with the negative pole post 105, the other end of the elastic piece 203 is used for being electrically connected with the positive pole post 101 of the battery, the short circuit between the positive pole post 101 and the negative pole post 105 of the battery is caused, a high-current fusing positive pole fuse is formed in a loop, and the overheating protection effect is achieved.
Example 5:
in the present embodiment, a short-circuit device for battery over-temperature protection is provided, the short-circuit device 20 includes an elastic member 203, a first magnetic sensing member 205 and a second magnetic sensing member 202, wherein the first magnetic sensing member 205 is a temperature-sensitive soft magnet, and the second magnetic sensing member 202 is a permanent magnet, which are attracted by magnetism.
The elastic piece 203, the first magnetic induction piece 205 and the second magnetic induction piece 202 are all conductors, two ends of the elastic piece 203 are respectively and electrically connected with the first magnetic induction piece 205 and the second magnetic induction piece 202, the first magnetic induction piece 205 is fixed on the battery top cover polar plate 10, the second magnetic induction piece 202 is an end A of a short circuit device, the second magnetic induction piece 202 is used for being electrically connected with a negative pole 105 of a battery when in a second position, the first magnetic induction piece 101 is an end B of the short circuit device, and the first magnetic induction piece 101 is used for being electrically connected with a positive pole 101 of the battery.
When the internal temperature of the battery does not exceed the preset value, the second magnetic induction piece 202 and the first magnetic induction piece 205 are mutually attracted due to magnetic force, so that the second magnetic induction piece 202 is located at the first position, and at the moment, two ends of the short-circuit device are disconnected; when the internal temperature of the battery exceeds a preset value, the magnetism of the second magnetism sensing piece 202 disappears, the elastic piece 203 recovers deformation, the second magnetism sensing piece 202 moves to the second position under the action of the elastic piece 203, so that the second magnetism sensing piece 202 is electrically connected with the negative pole post 105, the first magnetism sensing piece 101 is used for being electrically connected with the positive pole post 101 of the battery, the positive pole post 101 and the negative pole post 105 of the battery are in short circuit, a high-current fusing positive pole fuse is formed in a loop, and the overheating protection effect is achieved.
Example 6
The present embodiment provides a battery with an over-temperature protection function, for example, a square rechargeable lithium battery, as shown in fig. 1, the battery includes a battery top cover bottom plate 10, and a positive post 101 and a negative post 105 disposed on the battery top cover bottom plate 10, and the short-circuit device provided in the above embodiment is disposed on the battery top cover bottom plate 10. When the battery works normally, the magnetism of the first magnetic induction piece 205 or the second magnetic induction piece 202 is larger, so that the first magnetic induction piece 205 and the second magnetic induction piece 202 attract each other, and the second magnetic induction piece 202 compresses the elastic piece 203 to enable the upper end of the second magnetic induction piece to be far away from the negative pole 105; when the temperature in the battery exceeds a preset value, the magnetism of the first magnetic induction piece 205 or the second magnetic induction piece 202 is reduced or disappears, at the moment, the attraction force between the first magnetic induction piece 205 and the second magnetic induction piece 202 is reduced or disappears, the elastic piece 203 recovers and deforms, the second magnetic induction piece 202 is jacked up under the action of the elastic piece 203 to be in contact with the negative pole post 105, a short circuit is formed between the positive pole post 101 and the negative pole post 105, and the generated large current can fuse the positive fuse of the fuse, so that the battery is prevented from being charged and discharged continuously. Therefore, the battery provided by the embodiment has the function of automatically triggering the short circuit due to thermal runaway, prevents the battery from self-ignition or explosion caused by overheating, and ensures the personal safety of a user.
Meanwhile, the bottom plate 10 of the top cover of the battery is also provided with an explosion-proof valve 102 and a liquid injection port 104, the explosion-proof valve 102 is used for automatically releasing pressure when the gas pressure is too high in the charging and discharging of the battery to prevent explosion, the liquid injection port 104 is used for injecting acid liquid into the battery, and the explosion-proof valve 102 is also provided with an explosion-proof valve protection sheet 102, so that redundant gas in the battery can be discharged through the explosion-proof valve protection sheet 102.
It is right to have used specific individual example above the utility model discloses expound, only be used for helping to understand the utility model discloses, not be used for the restriction the utility model discloses. To the technical field of the utility model technical personnel, the foundation the utility model discloses an idea can also be made a plurality of simple deductions, warp or replacement.
Claims (10)
1. A short-circuit device for battery over-temperature protection is characterized in that the short-circuit device comprises an A end and a B end which are electrically connected, the short-circuit device comprises an elastic piece, a first magnetic induction piece and a second magnetic induction piece, at least one of the first magnetic induction piece and the second magnetic induction piece has magnetism, and the other one can be attracted by magnetism; one end of the elastic piece is connected with the second magnetic induction piece, and the other end of the elastic piece is relatively fixed;
the second magnetic induction piece and the first magnetic induction piece attract each other to compress the elastic piece, so that the A end of the short-circuit device is located at a first position; when the temperature of the battery exceeds a preset value, the magnetism of the first magnetic induction piece and/or the second magnetic induction piece is weakened or disappears, the elastic piece recovers and deforms to enable the end A of the short-circuit device to be located at the second position and used for being electrically connected with the first pole column of the battery, the end B of the short-circuit device is used for being electrically connected with the second pole column of the battery, and the electrical property of the first pole column is opposite to that of the second pole column.
2. The shorting device as recited in claim 1,
the elastic piece is a conductor, one end of the elastic piece, which is close to the second magnetic induction piece, is an A end of the short circuit device, one end of the elastic piece is used for being electrically connected with a first pole column of the battery when being positioned at the second position, the other end of the elastic piece is a B end of the short circuit device, and the other end of the elastic piece is used for being electrically connected with a second pole column of the battery;
or, the elastic member and the first magnetic induction member are both conductors, one end of the elastic member is electrically connected with the first magnetic induction member, the other end of the elastic member is the end a of the short circuit device, the other end of the elastic member is used for being electrically connected with a first pole of a battery when located at a second position, the first magnetic induction member is the end B of the short circuit device, and the first magnetic induction member is used for being electrically connected with a second pole of the battery;
or, the elastic member and the second magnetic induction member are both conductors, one end of the elastic member is electrically connected with the second magnetic induction member, the second magnetic induction member is the end a of the short circuit device, the second magnetic induction member is used for being electrically connected with the first pole of the battery when located at the second position, the other end of the elastic member is the end B of the short circuit device, and the other end of the elastic member is used for being electrically connected with the second pole of the battery;
or the elastic element, the first magnetic induction element and the second magnetic induction element are all conductors, two ends of the elastic element are respectively and electrically connected with the first magnetic induction element and the second magnetic induction element, the second magnetic induction element is the end A of the short circuit device, the second magnetic induction element is used for being electrically connected with a first pole of a battery when in a second position, the first magnetic induction element is the end B of the short circuit device, and the first magnetic induction element is used for being electrically connected with a second pole of the battery;
or, the elastic component, the first magnetic component and the second of feeling are felt to the magnetic component and are the conductor, the one end of elastic component with the second is felt the magnetic component electricity and is connected, just the first magnetic component and the second of feeling are felt to the magnetic component and are connected through flexible conductive piece, the second is felt the magnetic component and is done short circuit device's A end, the second is felt the magnetic component and is used for being connected with the first utmost point post electricity of battery when being located the second position, the other end and the first magnetic component of feeling of elastic component do short circuit device's B end, the other end and the first magnetic component of feeling of elastic component are used for being connected with the second utmost point post electricity of battery.
3. The shorting device as recited in claim 1, wherein one of the first and second magnetically sensitive members is a temperature sensitive soft magnet and the other is a permanent magnet, an iron block or an electromagnet.
4. The shorting device as recited in claim 1, further comprising an insulating guide member having a hollow guide cylinder formed therein for guiding the second magnetically sensitive member during movement thereof.
5. The shorting device as recited in claim 1, wherein the resilient member is a cylindrical spring.
6. The shorting device as recited in claim 4, wherein the first and second magnetically sensitive members are cylindrical, and the insulating guide is cylindrical and has a smooth inner wall.
7. The shorting device as recited in claim 5, wherein the diameter of the inner spring coil is greater than the diameter of the first magnetically susceptible member, the spring being nested on the first magnetically susceptible member.
8. The shorting device according to claim 2, wherein the flexible conductive member is one of a copper wire, an aluminum wire, a copper foil, or an aluminum foil.
9. A battery having an over-temperature protection function, characterized by comprising a short-circuiting device according to any one of claims 1 to 8.
10. The battery of claim 9, further comprising a fuse disposed in circuit between the first and second poles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920775986.8U CN210467972U (en) | 2019-05-27 | 2019-05-27 | Short-circuit device for battery over-temperature protection and battery with over-temperature protection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920775986.8U CN210467972U (en) | 2019-05-27 | 2019-05-27 | Short-circuit device for battery over-temperature protection and battery with over-temperature protection function |
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| Publication Number | Publication Date |
|---|---|
| CN210467972U true CN210467972U (en) | 2020-05-05 |
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| CN201920775986.8U Active CN210467972U (en) | 2019-05-27 | 2019-05-27 | Short-circuit device for battery over-temperature protection and battery with over-temperature protection function |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115020880A (en) * | 2022-06-23 | 2022-09-06 | 江苏正力新能电池技术有限公司 | Battery top cap and battery |
| WO2023245474A1 (en) * | 2022-06-22 | 2023-12-28 | 宁德时代新能源科技股份有限公司 | Battery pack and safety control method therefor, and electric device |
-
2019
- 2019-05-27 CN CN201920775986.8U patent/CN210467972U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023245474A1 (en) * | 2022-06-22 | 2023-12-28 | 宁德时代新能源科技股份有限公司 | Battery pack and safety control method therefor, and electric device |
| CN115020880A (en) * | 2022-06-23 | 2022-09-06 | 江苏正力新能电池技术有限公司 | Battery top cap and battery |
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