CN218998299U - Heating device and test equipment - Google Patents
Heating device and test equipment Download PDFInfo
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- CN218998299U CN218998299U CN202320082873.6U CN202320082873U CN218998299U CN 218998299 U CN218998299 U CN 218998299U CN 202320082873 U CN202320082873 U CN 202320082873U CN 218998299 U CN218998299 U CN 218998299U
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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
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Abstract
The utility model discloses a heating device and test equipment, wherein the heating device is used for triggering thermal runaway of a battery cell, and comprises: the heating sheet comprises a metal layer, the metal layer comprises a heating part and a leading-out part which are integrally formed, the leading-out part is led out of an area where the heating part is located by the heating part, the resistance of the leading-out part is smaller than that of the heating part, and the lead is connected to the leading-out part so that the heating part is electrically connected with the lead through the leading-out part. In the technical scheme, the heating device is not easy to scratch the isolating film of the electrode assembly, the probability of short circuit of the electrode assembly is reduced, and the battery cell thermal runaway test is facilitated to be normally carried out.
Description
Technical Field
The utility model relates to the technical field of battery testing, in particular to a heating device and testing equipment.
Background
In recent years, new energy automobiles have been developed in a leap way, in the field of electric automobiles, batteries serve as power sources of the electric automobiles and play an irreplaceable important role, and the batteries serve as core parts of the new energy automobiles and have higher requirements on reliability, so that reliability tests of the batteries play an important role. When the reliability test of the battery is carried out, a heating film device is generally adopted to trigger the battery cell to generate thermal runaway, however, the battery cell has the problem of short circuit during the test, so that the test cannot be carried out normally.
Disclosure of Invention
The embodiment of the utility model provides a heating device which is beneficial to the normal running of a test when the thermal runaway test of a battery monomer is triggered.
In a first aspect, an embodiment of the present utility model provides a heating device for triggering thermal runaway of a battery cell, the heating device including: the heating sheet comprises a metal layer, the metal layer comprises a heating part and a leading-out part which are integrally formed, the leading-out part is led out of an area where the heating part is located by the heating part, the resistance of the leading-out part is smaller than that of the heating part, and the lead is connected to the leading-out part so that the heating part is electrically connected with the lead through the leading-out part.
In the technical scheme, the metal layer comprises the heating part and the leading-out part which are integrally formed, the leading-out part is led out of the area where the heating part is located by the heating part, the resistance of the leading-out part is smaller than that of the heating part, and the lead is connected to the leading-out part, so that the heating part is electrically connected with the lead through the leading-out part, the isolating film of the electrode assembly is not easy to scratch by the heating device, the probability of causing short circuit of the electrode assembly is reduced, and the battery cell thermal runaway test is facilitated to be normally carried out.
In some embodiments, the heating portion includes a heating wire, the lead-out portion includes two lead-out wires, the two lead-out wires extend from two ends of the heating wire, respectively, the extending length of the heating wire is greater than the extending length of the lead-out wire, and the width of the heating wire is smaller than the width of the lead-out wire.
In the technical scheme, the heating part and the lead-out part are arranged in the mode, so that the resistance of the lead-out part is smaller than that of the heating part, and the design and processing difficulty of the metal layer can be reduced.
In some embodiments, two ends of the heating wire are located at the same side edge of the heating part, and the two outgoing wires extend from the two ends of the heating wire towards the same direction.
In the technical scheme, as the two outgoing lines extend from the same side of the heating part towards the same direction, the positions of the two wires respectively connected with the two outgoing lines are relatively close, so that the outgoing and the connection of the wires are convenient, and the arrangement of the test is simplified.
In some embodiments, the lead wire extends along a straight line, and an end of the lead wire in an extending direction away from the heat generating portion is connected to the wire.
In the technical scheme, the connection position of the lead and the lead-out part is far away from the heating part as far as possible, so that the risk of scratching the isolating film at the connection position can be better reduced, the lead-out wire is simple in structure and short in extension length, the resistance of the lead-out part is reduced, and the thermal runaway test effect on the battery monomers is improved.
In some embodiments, the heat generating portion and the wire are connected to two ends of the lead-out portion in a length direction thereof, respectively, and the length of the lead-out portion is greater than the length of the heat generating portion along the length direction of the lead-out portion.
In the technical scheme, the connection position of the lead and the lead-out part can be far away from the heating part as far as possible, so that the risk of scratching the isolating film at the connection position is reduced better.
In some embodiments, the area of the lead-out portion is larger than the area of the heat generating portion.
In the technical scheme, the resistance of the extraction part is reduced, so that the temperature of the extraction part is not easy to rise through current, unnecessary heat introduction to the battery cell is reduced, and the thermal runaway test effect to the battery cell is improved.
In some embodiments, the thickness of the heat generating portion is consistent with the thickness of the lead-out portion; alternatively, the thickness of the heat generating portion is smaller than the thickness of the lead portion.
In the above technical scheme, when the thickness of portion that generates heat is unanimous with the thickness of portion of drawing forth, the processing of metal level of being convenient for is favorable to making the whole thickness of piece that generates heat basically unanimous moreover to reduce the risk that the piece that generates heat lacerates the barrier film better. When the thickness of the heating part is smaller than that of the leading-out part, the resistance of the leading-out part can be further reduced, and the thermal runaway test effect on the battery cell is improved.
In some embodiments, the wire is soldered to the lead-out and the soldering location is encased with an insulating layer.
In the technical scheme, reliable electric connection of the lead and the lead-out part can be simply and effectively realized, the insulating property of the electric connection part can be ensured, the risk of disconnection or short circuit of the connection part is reduced, and the reliability of the test is improved.
In some embodiments, the heat generating sheet further includes an insulating film, and the insulating film is wrapped outside the metal layer.
In the technical scheme, the heating sheet can have reliable insulating performance so as to reduce the risk of short circuit in the battery cell and improve the test reliability of the battery cell.
In some embodiments, the heat generating sheet further includes an insulating paste adhered to the inner side of the insulating film and wrapped around the outer side of the metal layer.
In the technical scheme, the insulation film can be fixed through the insulation glue, and the insulation performance of the heating sheet can be improved through the insulation glue.
In a second aspect, an embodiment of the present utility model provides a testing apparatus, including the heat generating device described above.
In the technical scheme, the heating device is arranged, so that the thermal runaway test of the battery cell can be normally carried out.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a heat generating device according to some embodiments of the present utility model;
FIG. 2 is an exploded view of a heat generating device and a battery cell according to some embodiments of the present utility model;
FIG. 3 is a diagram illustrating a heat generating device and an electrode assembly according to some embodiments of the present utility model;
fig. 4 is an assembly diagram of a heat generating device and a battery cell according to some embodiments of the present utility model;
FIG. 5 is a schematic diagram illustrating connection of test equipment according to some embodiments of the present utility model;
fig. 6 is a schematic diagram of a heating film device in the related art.
Icon: a test device 100; a heat generating device 10; a heat generating sheet 11; a heat generating portion 1a; a heating wire 111; a lead-out portion 1b; a lead wire 112; an insulating film 113; a wire 12; a welding portion 13; an insulating layer 14; a battery cell 20; an electrode assembly 21; a housing 22; a top cover 221; an electric control device 30; a power supply 200.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model; the terms "comprising" and "having" and any variations thereof in the description of the utility model and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion. The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order.
Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the utility model. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "attached" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
The term "and/or" in the present utility model is merely an association relation describing the association object, and indicates that three kinds of relations may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In the present utility model, the character "/" generally indicates that the front and rear related objects are an or relationship.
In the embodiments of the present utility model, the same reference numerals denote the same components, and detailed descriptions of the same components are omitted in different embodiments for the sake of brevity. It should be understood that the thickness, length, width, etc. dimensions of the various components in the embodiments of the utility model shown in the drawings, as well as the overall thickness, length, width, etc. dimensions of the integrated device, are merely illustrative and should not be construed as limiting the utility model in any way.
The term "plurality" as used herein refers to two or more (including two).
In the present utility model, the battery cell may include a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like, which is not limited in the embodiment of the present utility model. The battery cell may be in a cylindrical shape, a flat shape, a rectangular parallelepiped shape, or other shapes, which is not limited in this embodiment of the utility model. The battery cells are generally classified into three types according to the packaging method: the cylindrical battery cell, the square battery cell and the soft package battery cell are not limited in this embodiment. Reference to a battery in accordance with an embodiment of the present utility model refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity.
The battery cell includes a case, an electrode assembly, and an electrolyte, and the case is used to accommodate the electrode assembly and the electrolyte. The electrode assembly consists of a positive electrode plate, a negative electrode plate and a separation film. The battery cell mainly relies on metal ions to move between the positive pole piece and the negative pole piece to work. The material of the separator is not limited, and may be, for example, polypropylene or polyethylene.
The positive electrode sheet may generally include a positive electrode current collector and a positive electrode active material layer directly or indirectly coated on the positive electrode current collector, the positive electrode current collector without the positive electrode active material layer protruding from the positive electrode current collector coated with the positive electrode active material layer, the positive electrode current collector without the positive electrode active material layer serving as a positive electrode tab. Taking a lithium ion battery as an example, the material of the positive electrode current collector can be aluminum, and the material of the positive electrode active material layer can be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate or the like.
The negative electrode tab may generally include a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer being directly or indirectly coated on the negative electrode current collector, the negative electrode current collector without the negative electrode active material layer protruding from the negative electrode current collector with the coated negative electrode active material layer, the negative electrode current collector without the negative electrode active material layer serving as a negative electrode tab. The material of the negative electrode current collector may be copper, and the material of the negative electrode active material layer may be carbon, silicon, or the like.
In order to ensure that the high current is passed without fusing, the number of positive electrode lugs is multiple and stacked together, and the number of negative electrode lugs is multiple and stacked together. The electrode assembly may be a wound structure or a lamination structure, and embodiments of the present utility model are not limited thereto.
In recent years, new energy automobiles have been developed in a leap way, in the field of electric automobiles, batteries serve as power sources of the electric automobiles and play an irreplaceable important role, and the batteries serve as core parts of the new energy automobiles and have higher requirements on reliability, so that reliability tests of the batteries play an important role.
The inventor found that when the reliability test of the battery is performed, a heating film device is generally used to trigger the battery cell to generate thermal runaway, for example, in conjunction with fig. 6, a general heating film device includes a heating film a and a power cord B, the heating film a includes a heating wire and an insulating film covering the heating wire, the heating wire and the power cord are connected by soldering, and then a fixing glue is coated on a soldered solder joint C for making solder joint insulation, and this connection manner forms a larger convex hull at the position of the solder joint C.
In a normal test, the heating film a is required to be placed between two electrode assemblies in a battery cell and corresponds to the central area of the electrode assemblies, then the two electrode assemblies sandwiching the heating film are placed in the housing of the battery cell, and the power line B of the heating film device is led out of the housing and connected with a power supply, so that the test can be performed. However, because the position of the welding point C of the power line B and the heating film A can form a larger convex hull, when the heating film A is placed between two electrode assemblies, extrusion can be formed, the electrode assemblies can vibrate and impact in the transportation process of the battery monomers, and the convex hull can risk of scratching the isolating film of the electrode assemblies, once the isolating film is scratched, the electrode assemblies can be short-circuited, and the reliability of the battery monomers is affected.
In addition, because power cord B and heating film A's heater direct welding, when heating film A is located electrode assembly's central region, power cord B and heating film A's solder joint C also is close electrode assembly's central region, consequently solder joint C and fixed glue can submerge in electrolyte for a long time, because electrolyte has strong corrosivity, and fixed glue and soldering tin are all not able to bear electrolyte corruption, after a period of time, fixed glue can be corroded by electrolyte for solder joint C exposes between the barrier film, has reduced heating film A's insulating properties, and then influences whole battery cell's insulating properties. Moreover, the longer the time is, the more likely the whole welding point C is corroded completely by electrolyte, so that the power line B is disconnected from the heating film A, the heating film device cannot work normally, and the battery monomer cannot be triggered to perform thermal runaway, thereby influencing the normal performance of the reliability test.
Based on the above-mentioned considerations, in order to allow the reliability test of the battery to be normally performed, the inventors have conducted intensive studies to design a heating device 10 for triggering thermal runaway of the battery cells, and, in connection with fig. 1, by drawing out a lead wire 112 integrally formed with a heating wire 111 based on the original heating wire 111 and then welding the lead wire 12 to the lead wire 112, and, in connection with fig. 2 and 3, when the heating wire 111 is disposed in the central region of an electrode assembly 21, the welding portion 13 of the lead wire 12 and the lead wire 112 can extend beyond the edge of the electrode assembly 21 due to the portion having the lead wire 112, and is not interposed between the two electrode assemblies 21 any more, so that the welding portion 13 does not squeeze the rupture barrier film, thereby reducing the risk of causing a short circuit of the electrode assembly 21. Moreover, when the welding portion 13 is located above the upper edge of the electrode assembly 21, the welding portion 13 may not be immersed in the electrolyte for a long period of time, so that the probability of corrosion of the welding portion 13 by the electrolyte is reduced, the insulation performance of the heat generating device 10 is improved, the risk of disconnection of the lead 12 from the lead wire 112 is reduced, the reliability of the heat generating device 10 is improved, and the normal performance of the reliability test is facilitated.
Next, a heat generating device 10 according to an embodiment of the present utility model is described with reference to the drawings.
As shown in fig. 1 to 4, the heat generating device 10 is used to trigger thermal runaway of the battery cell 20, and the heat generating device 10 includes: a heat-generating sheet 11 and a wire 12. The heat generating sheet 11 includes a metal layer including a heat generating portion 1a and a lead-out portion 1b integrally formed, the lead-out portion 1b is led out from the heat generating portion 1a to the outside of the region where the heat generating portion 1a is located, the resistance of the lead-out portion 1b is smaller than that of the heat generating portion 1a, and the lead 12 is connected to the lead-out portion 1b so that the heat generating portion 1a is electrically connected to the lead 12 through the lead-out portion 1 b.
In the above-mentioned technical solution, since the lead-out portion 1b integrally formed with the heat-generating portion 1a is provided in the metal layer of the heat-generating sheet 11, that is, the heat-generating portion 1a and the lead-out portion 1b are integrally designed, for example, may be etched from the same metal sheet, so that the whole heat-generating sheet 11 may maintain the sheet shape without a local convex hull, so that, when the test is performed, the heat-generating sheet 11 including the lead-out portion 1b and the heat-generating portion 1a which are integrally formed in the sheet shape may be provided on one side of the electrode assembly 21 in the thickness direction, the sheet-shaped heat-generating sheet 11 is not liable to scratch the separator of the electrode assembly 21, and the probability of causing a short circuit of the electrode assembly 21 is reduced.
Moreover, since the lead-out portion 1b is led out from the heat generating portion 1a to the outside of the region where the heat generating portion 1a is located, to take the portion of the metal layer located outside the region where the heat generating portion 1a is located as the lead-out portion 1b, it is possible to use the lead-out portion 1b from the heat generating portion 1a to connect the lead 12 instead of the lead 12 being directly connected to the heat generating portion 1a so that the lead 12 can be far from the heat generating portion 1a, so that the heat generating portion 1a having relatively large resistance can be brought closer to the central region of the electrode assembly 21 as usual for triggering the thermal runaway of the battery cell 20, and the lead-out portion 1b having relatively small resistance can be used to connect the lead 12 as a conductive bridge between the lead 12 and the heat generating portion 1a so that the connection position of the lead 12 and the lead-out portion 1b can be located outside the edge of the electrode assembly 21, for example, so that the risk of breaking the separator of the electrode assembly 21 due to the connection position bulging can be reduced, and the probability of causing the short circuit of the electrode assembly 21 can be reduced.
In addition, when the connection position of the lead-out portion 1b and the lead 12 protrudes above the upper edge of the electrode assembly 21, the connection position can no longer be immersed in the electrolyte for a long time, the probability of corrosion of the connection position by the electrolyte is reduced, the insulating performance of the heat generating device 10 is improved, the risk of disconnection of the heat generating sheet 11 and the lead 12 is reduced, the reliability of the heat generating device 10 is improved, and the normal performance of the reliability test is facilitated.
In some embodiments, as shown in fig. 1, the heat generating part 1a includes a heat generating wire 111, the lead-out part 1b includes two lead-out wires 112, the two lead-out wires 112 extend from two ends of the heat generating wire 111, respectively, the extension length of the heat generating wire 111 is greater than the extension length of the lead-out wire 112, and the width of the heat generating wire 111 is smaller than the width of the lead-out wire 112.
It can be understood that the heating wire 111 and the outgoing wire 112 are both in a line shape, the heating wire 111 is one and the extending track is not limited, and the outgoing wire 112 is two extending from two ends of the heating wire 111 respectively. In the above technical solution, since the heating wire 111 can be formed in a long and narrow form within a region, so that the resistance of the heating portion 1a is large, the temperature can be quickly raised after the power is applied, so as to trigger the thermal runaway of the battery cell 20.
It should be noted that, the extending path of the heating wire 111 is not limited, and may be specifically designed according to practical requirements, for example, may be in the form shown in fig. 1, but is not limited to the form shown in fig. 1, for example, may be bent and bent along a serpentine line, or extend along a spiral line, etc., so as to increase the extending length of the heating wire 111 as much as possible and increase the resistance of the heating portion 1 a.
By extending the two ends of the heating wire 111 out of the outgoing wires 112, when the two outgoing wires 112 are connected with the positive electrode and the negative electrode of the power supply through the wires 12, the heating wire 111 can pass through the current, and the heating effect is realized. Since the lead-out wire 112 is constructed in a wide and short form, the resistance of the lead-out portion 1b is small, and the temperature is not easily raised by the current, thereby reducing unnecessary heat introduction to the battery cell 20 and improving the thermal runaway test effect to the battery cell 20.
In the above technical solution, by setting the heating portion 1a and the lead-out portion 1b to the above form, the lead-out portion 1b can be simply and effectively led out of the area where the heating portion 1a is located from the heating portion 1a, and the resistance of the lead-out portion 1b is smaller than that of the heating portion 1a, so that the design and processing difficulty of the metal layer are reduced.
Of course, the present utility model is not limited thereto, and in other embodiments of the present utility model, the heat generating portion 1a and the lead portion 1b may be designed in other forms, for example, the lead portion 1b may be in a linear form other than the lead 112, for example, may be circular, elliptical, semicircular, polygonal, or irregular, and the description thereof is omitted herein. In addition, the heat generating portion 1a may be provided in other forms, for example, may include a plurality of heat generating segments arranged in parallel, and the like, which will not be described herein.
In some embodiments, as shown in fig. 1, two ends of the heating wire 111 are located at the same side edge of the heating portion 1a, and two outgoing wires 112 extend from the two ends of the heating wire 111 toward the same direction.
For example, both ends of the heating wire 111 are located at the upper side edge of the heating portion 1a, and both lead wires 112 extend upward from the upper side edge of the heating portion 1a; alternatively, for example, both ends of the heating wire 111 are located at the left side edge of the heating portion 1a, and the two lead wires 112 extend leftward from the left side edge of the heating portion 1a; further alternatively, for example, both ends of the heating wire 111 are located at the right side edge of the heating portion 1a, and the two lead wires 112 extend rightward from the right side edge of the heating portion 1a; further alternatively, for example, both ends of the heating wire 111 are located at the lower side edge of the heating portion 1a, both the lead wires 112 extend downward from the lower side edge of the heating portion 1a, and so on.
In the above technical solution, since the two outgoing lines 112 extend from the same side of the heating portion 1a toward the same direction, the positions of the two wires 12 connected to the two outgoing lines 112 respectively are relatively close, so that the wires 12 are conveniently led out and connected, and the arrangement of the test is simplified.
Of course, the present utility model is not limited to this, and for example, in other embodiments, both ends of the heating wire 111 may be disposed on opposite sides of the heating portion 1a, and the two lead wires 112 may extend from opposite sides of the heating portion 1a in different directions. For example, both ends of the heating wire 111 are respectively located at the upper side and the lower side of the heating portion 1a, one lead wire 112 extends upward from the upper side of the heating portion 1a, and the other lead wire 112 extends downward from the lower side of the heating portion 1a; alternatively, for example, two ends of the heating wire 111 are respectively located at the left side and the right side of the heating portion 1a, one lead wire 112 extends from the left side to the left side of the heating portion 1a, and the other lead wire 112 extends from the right side to the right side of the heating portion 1a, so that the risk of short circuit is reduced, and details are not repeated here.
In some embodiments, as shown in fig. 1, the lead wire 112 extends along a straight line, and one end of the lead wire 112 in the extending direction away from the heat generating portion 1a is connected to the wire 12.
Therefore, the connection position of the lead 12 and the lead-out portion 1b can be far away from the heating portion 1a as far as possible, so that the risk of scratching the isolating film at the connection position can be reduced better, the lead-out wire 112 is simple in structure and short in extension length, the resistance of the lead-out portion 1b is reduced, the lead-out portion 1b is not easy to heat up through current, unnecessary heat introduction to the battery cell 20 is reduced, and the thermal runaway test effect to the battery cell 20 is improved.
Of course, the present utility model is not limited thereto, and, for example, in other embodiments of the present utility model, the lead-out wires 112 may also extend along a non-straight line, for example, the lead-out wires 112 may extend along a folding line, or along a curve, etc., which will not be described herein.
In some embodiments, the heat generating portion 1a and the wire 12 are connected to both ends of the lead-out portion 1b in the length direction, respectively, and the length of the lead-out portion 1b is greater than the length of the heat generating portion 1a along the length direction of the lead-out portion 1 b.
The form of the lead portion 1b is not limited, and the extending direction of the line connecting the two points farthest from each other on the edge of the lead portion 1b is the longitudinal direction of the lead portion 1b, for example, the left-right direction shown in fig. 1 is the longitudinal direction of the lead portion 1 b.
The shape of the lead portion 1b is not limited, and for example, when the lead portion 1b is linear, the connecting line direction of both ends in the extending direction of the lead portion 1b is the longitudinal direction of the lead portion 1b, and at this time, the heat generating portion 1a and the wire 12 are connected to both ends in the extending direction of the lead portion 1b, respectively; for another example, when the lead portion 1b is circular, the diameter direction of the circular shape is the length direction of the lead portion 1b, and at this time, the heat generating portion 1a and the wire 12 are connected to both ends of the lead portion 1b in the diameter direction, respectively.
In the above technical solution, since the heat generating portion 1a and the wire 12 are respectively connected to two ends of the lead-out portion 1b in the length direction, and the length of the lead-out portion 1b is greater than the length of the heat generating portion 1a along the length direction of the lead-out portion 1b, the connection position of the wire 12 and the lead-out portion 1b can be far away from the heat generating portion 1a as much as possible, so that the risk of tearing the isolation film at the connection position can be better reduced.
Of course, the present utility model is not limited thereto, and for example, in other embodiments of the present utility model, the heat generating portion 1a and the conductive wire 12 may be connected to other opposite sides of the lead portion 1b, instead of two ends of the length, which will not be described herein.
In some embodiments, as shown in fig. 1, the area of the lead-out portion 1b is larger than the area of the heat generating portion 1 a. Therefore, the resistance of the extraction part 1b is reduced, so that the temperature of the extraction part 1b is not easy to rise through current, unnecessary heat introduction to the battery cell 20 is reduced, and the thermal runaway test effect to the battery cell 20 is improved.
In some embodiments, the thickness of the heat generating portion 1a coincides with the thickness of the lead-out portion 1 b. Thereby, the processing of the metal layer is facilitated, and the overall thickness of the heat generating sheet 11 is made substantially uniform, so that the risk of the heat generating sheet 11 scratching the barrier film can be reduced better.
Of course, the present utility model is not limited thereto, and for example, in other embodiments of the present utility model, the thickness of the heat generating portion 1a may be set smaller than the thickness of the lead-out portion 1b, so that the resistance of the lead-out portion 1b may be further reduced, and the lead-out portion 1b is not easily warmed up by the current, so that unnecessary heat introduction to the battery cell 20 is reduced, and the thermal runaway test effect to the battery cell 20 is improved.
It will be appreciated that, although the thickness of the heat generating portion 1a is different from that of the lead-out portion 1b, the heat generating portion 1a and the lead-out portion 1b are still both in the form of sheet bodies, and are integrally connected, rather than welded, and the welded convex hulls are not formed, so that the risk of the heat generating sheet 11 scratching the isolation film can be reduced well.
In some embodiments, as shown in fig. 1, the wire 12 is soldered to the lead-out portion 1b and the soldering position is covered with the insulating layer 14, that is, the soldering portion 13 formed by soldering is covered with the insulating layer 14. Therefore, reliable electric connection of the lead 12 and the lead-out part 1b can be simply and effectively realized, the insulation performance of the electric connection part of the lead 12 and the lead-out part 1b can be ensured, the risk of disconnection or short circuit of the connection part of the lead 12 and the lead-out part 1b is reduced, and the reliability of the test is improved.
The insulating layer 14 may be formed by, for example, coating an insulating adhesive, or wrapping an insulating film, and the like, and will not be described here. In addition, in other embodiments of the present utility model, besides soldering, the connection between the lead 12 and the lead-out portion 1b may be achieved by bonding conductive adhesive, etc., which will not be described herein.
In some embodiments, as shown in fig. 1, the heat generating sheet 11 further includes an insulating film 113, and the insulating film 113 is wrapped on the outer side of the metal layer. Thus, the heat generating sheet 11 may have reliable insulation performance to reduce the risk of causing a short circuit in the battery cell 20 and improve the test reliability of the battery cell 20. Moreover, insulation between the heat generating sheet 11 and the electrode assembly 21 by other means can be omitted, thereby reducing the difficulty of testing.
The material of the insulating film 113 is not limited, and may be, for example, polyimide film, polyethylene, polyvinylidene fluoride, polytetrafluoroethylene, or the like.
In some embodiments, the heat generating sheet 11 further includes an insulating paste adhered to the inner side of the insulating film 113 and wrapped around the outer side of the metal layer. Therefore, on one hand, the insulation film 113 can be fixed through the insulation glue, and on the other hand, the insulation performance of the heating sheet 11 can be further improved through the insulation glue, so that the insulation film 113 is scratched or damaged, the heating sheet 11 can have reliable insulation performance, the risk of short circuit in the battery cell 20 is reduced, and the test reliability of the battery cell 20 is improved.
It should be noted that the material of the insulating glue is not limited, for example, an insulating glue resistant to corrosion of electrolyte can be selected, so that the insulating protection performance is improved, and the insulating glue can be epoxy resin, polyimide, fluororubber or silicone rubber, for example.
It should be noted that the material of the metal layer is not limited, and may be, for example, copper alloy, or other metals or alloys, so that both cost and better heat-emitting performance can be achieved.
In addition, the utility model also provides test equipment 100, which comprises the heating device 10 of any embodiment. The heat generating device 10 is beneficial to ensuring the reliable and normal operation of the test equipment 100.
Other configurations of the test apparatus 100 according to the embodiment of the present utility model are not limited, for example, in conjunction with fig. 5, the test apparatus 100 may further include an electric control device 20, and during the test, one end of the wire 12 of the heat generating device 10 may be connected to the electric control device 20, and the electric control device 20 may be connected to the power supply 200, or a power supply module built in the electric control device 20 may not be connected to the power supply 200, and the operation of the heat generating device 10 may be controlled by the electric control device 20, so as to perform the test. Alternatively, in other embodiments of the present utility model, the testing apparatus 100 may not include the electronic control device 20, and the heat generating device 10 is directly connected to the power source 200 during testing, which is not described herein.
Next, a heat generating device 10 according to an embodiment of the present utility model is described with reference to the drawings.
As shown in fig. 1, the heat generating device 10 includes a heat generating sheet 11 and a wire 12, the heat generating sheet 11 includes a metal layer and an insulating film 113 wrapping the metal layer, the metal layer includes a heat generating wire 111 and an outgoing wire 112, and when processing, the heat generating wire 111 and the outgoing wire 112 are made into an integrated design, the thickness is made to be the same, and then the heat generating wire is covered with an insulating adhesive resistant to electrolyte corrosion, and then covered with the insulating film 113. One end of the wire 12 is soldered to one end of the outgoing wire 112 remote from the heating wire 111, and then an insulating layer 14 is covered outside the soldered portion 13.
In the test, referring to fig. 2 to 4, the heat generating sheet 11 is sandwiched between the two electrode assemblies 21, the welded portion 13 of the lead wires 112 and the lead wires 12 is pulled out above the upper edges of the electrode assemblies 21, then the two electrode assemblies 21 are sandwiched and mounted in the case 22 of the battery cell 20, and then the other end of the lead wires 12 is pulled out from the top cover 221 of the case 22 to connect the electronic control device 20 or the power supply 200, etc.
Therefore, during testing, the problem that the welded convex hulls scratch the isolating membrane in the original design can be avoided, and the risk that the isolating membrane of the electrode assembly 21 is damaged by the heating device 10 can be greatly reduced. In addition, since the welded portion 13 of the lead wire 112 and the lead wire 12 is pulled out above the electrode assembly 21, the probability that the welded portion 13 is soaked in the electrolyte can be reduced to improve the problem that the welded portion 13 and the insulating layer 14 covering the welded portion 13 are corroded by the electrolyte, thereby improving the insulating performance of the entire heat generating device 10, so that the heat generating device 10 can reliably trigger the battery cell 20 to be thermally out of control, so that the test can be performed normally.
It should be noted that the structure of the battery cell 20 may be other forms, and the setting position of the heat generating sheet 11, the extraction direction of the lead 12, and the extraction position may be adjusted according to the structure of the battery cell 20. For example, when the electrode assembly 21 in the battery cell 20 is single, the heat generating sheet 11 may be attached to one side surface in the thickness direction of the electrode assembly 21. For example, the welded portion 13 of the lead wire 12 and the lead wire 112 may be pulled out to the left of the left edge, the right of the right edge, the lower side of the lower edge, or the like of the electrode assembly 21. For example, the wires 12 may also lead from the side or bottom of the housing 22, etc.
Furthermore, it should be noted that the length of the lead-out wires 112 may be designed according to the size of the battery cell 20, for example, the length of the lead-out wires 112 may be designed to be equal to or greater than one half of the length or width of the battery assembly, thereby ensuring that the welding parts 13 may be located beyond the edges of the electrode assembly 21.
The width of the lead-out wire 112 may be designed according to the power of the heating device, if the lead-out wire 112 is too thin, the self resistance of the lead-out wire 112 will be relatively high, so that when the heating device works, the lead-out wire 112 will also generate heat, thereby affecting the reality of triggering thermal runaway, and if the lead-out wire 112 is too wide, more redundancy exists in the portion of the lead-out wire 112 exposed outside the edge of the electrode assembly 21, and the fixing difficulty is relatively high.
For example, the length of the lead wire 112 and the power of the heat generating device 10 may be determined according to the test requirements and the form of the battery cell 20, and the ratio of the resistance of the lead wire 112 to the overall resistance of the heat generating sheet 11 may be determined on the premise that the heat generation of the lead wire 112 has no influence on the entire heating process, and then the minimum value of the width of the lead wire 112 may be calculated.
It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other.
The above is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (11)
1. A heat generating device for triggering thermal runaway of a battery cell, the heat generating device comprising:
the heating sheet comprises a metal layer, wherein the metal layer comprises a heating part and a leading-out part which are integrally formed, the leading-out part is led out of the area where the heating part is located by the heating part, and the resistance of the leading-out part is smaller than that of the heating part; and
and a lead wire connected to the lead-out portion so that the heat generating portion is electrically connected to the lead wire through the lead-out portion.
2. The heat generating device according to claim 1, wherein the heat generating portion includes a heat generating wire, the lead-out portion includes two lead-out wires, the two lead-out wires extend from both ends of the heat generating wire, respectively, an extension length of the heat generating wire is greater than an extension length of the lead-out wire, and a width of the heat generating wire is smaller than a width of the lead-out wire.
3. The heat generating device according to claim 2, wherein both ends of the heat generating wire are located at the same side edge of the heat generating portion, and the two lead wires extend from both ends of the heat generating wire toward the same direction.
4. The heat generating device according to claim 2, wherein the lead wire extends in a straight line, and an end of the lead wire in an extending direction away from the heat generating portion is connected to the wire.
5. The heat generating device according to claim 1, wherein the heat generating portion and the wire are connected to both ends of the lead-out portion in a longitudinal direction thereof, respectively, and the length of the lead-out portion is longer than the length of the heat generating portion in the longitudinal direction thereof.
6. The heat generating device according to claim 1, wherein an area of the lead-out portion is larger than an area of the heat generating portion.
7. The heat generating device according to claim 1, wherein a thickness of the heat generating portion is identical to a thickness of the lead-out portion; alternatively, the thickness of the heat generating portion is smaller than the thickness of the lead-out portion.
8. The heat generating device of claim 1, wherein the wire is soldered to the lead-out portion and an insulating layer is encased in the soldered location.
9. The heat generating device according to any one of claims 1 to 8, wherein the heat generating sheet further comprises an insulating film, the insulating film being wrapped outside the metal layer.
10. The heat generating device of claim 9, wherein the heat generating sheet further comprises an insulating paste adhered to an inner side of the insulating film and wrapped around an outer side of the metal layer.
11. Test apparatus, characterized in that it comprises a heat generating device according to any one of claims 1-10.
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CN202320082873.6U CN218998299U (en) | 2023-01-28 | 2023-01-28 | Heating device and test equipment |
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CN202320082873.6U CN218998299U (en) | 2023-01-28 | 2023-01-28 | Heating device and test equipment |
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