CN112382807A - Cylindrical battery structure for low-temperature heating - Google Patents
Cylindrical battery structure for low-temperature heating Download PDFInfo
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- CN112382807A CN112382807A CN202011256339.XA CN202011256339A CN112382807A CN 112382807 A CN112382807 A CN 112382807A CN 202011256339 A CN202011256339 A CN 202011256339A CN 112382807 A CN112382807 A CN 112382807A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/615—Heating or keeping warm
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
- H01M10/625—Vehicles
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/64—Heating or cooling; Temperature control characterised by the shape of the cells
- H01M10/643—Cylindrical cells
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/654—Means for temperature control structurally associated with the cells located inside the innermost case of the cells, e.g. mandrels, electrodes or electrolytes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/657—Means for temperature control structurally associated with the cells by electric or electromagnetic means
- H01M10/6571—Resistive heaters
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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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Battery Mounting, Suspending (AREA)
Abstract
A cylindrical battery structure for low-temperature heating adopts a cylindrical battery structure with a built-in heating plate, is used for heating a cylindrical battery at low temperature, does not occupy the space of a battery module, does not need to modify a battery pack box body, effectively reduces the installation quality of the battery module, and is beneficial to the light weight of an electric automobile; compared with an externally mounted heating system, the built-in heating sheet is less prone to damage caused by external stress, and the reliability of the whole heating system is improved; the heat transfer when the built-in heating plate operates is more reasonable, the thermal resistance is smaller, the heat transfer efficiency is greatly improved, each monomer can be independently heated, and the inconsistency caused by the existing heating mode can be overcome.
Description
Technical Field
The invention relates to the technical field of battery structures, in particular to a novel round battery structure capable of realizing low-temperature heating for the battery structure.
Background
Under a low-temperature environment, various performance indexes of the power battery change, such as available capacity reduction, internal contact resistance increase, chemical reaction rate reduction and the like, so that the performance of the battery is rapidly reduced, particularly for the lithium ion power battery, lithium precipitation can be caused by charging under a low-temperature condition, and a serious person can pierce a battery diaphragm to cause thermal runaway of the battery. Therefore, to overcome the battery performance degradation caused by low temperature, various heating devices are widely used in power battery systems.
In the existing technical scheme of adopting a heating film or a heating body, the heating part is mostly arranged outside a shell of the lithium ion battery and is tightly attached to the shell of the battery or arranged on the inner surface of a box structure of the battery. For example, patent CN210897552U discloses a heating structure of a battery pack and a battery pack, wherein the heating structure is suitable for heating an electric core set of the battery pack, and the heating structure includes: an aluminum vapor chamber and a heating film. The aluminum temperature-uniforming plate is suitable for thermally contacting the battery module, the heating film is connected to the side wall of the aluminum temperature-uniforming plate and forms thermal contact, and the heating film is suitable for being arranged on one side, far away from the electric core group, of the aluminum temperature-uniforming plate so as to be spaced from the electric core group. Although the structure can enable the battery to be heated uniformly to a certain extent, the heating film is arranged at the bottom of the battery, and the temperature of the battery cell still has the defect of obvious inconsistency. The patent CN211265578U provides a heating film matched with the outer box of cylinder electricity core module for reduce the temperature difference of group battery, be applicable to cylindrical battery. This kind of heating film structure has greatly taken up battery exterior space, and the structure is complicated, has increased the quality of battery module, is unfavorable for the realization of car lightweight. The arrangement methods belong to external installation methods, in the methods, heat is transferred from the outside of the battery to the inside of the battery, the heat resistance is high in the heat transfer process, the heat transfer efficiency is low, and the inconsistency of the temperature of the battery module is easily aggravated. Patent CN210379355U proposes a lithium ion battery cylindrical structure with an internal heating body, in which a micron-sized electrical heating film layer is placed in a lithium ion battery cylindrical shell to form a lithium ion battery cylindrical shell with a heating function. The shell comprises a polymer material layer, a first binder layer, a heating film layer, a second binder layer and a metal material layer from outside to inside in sequence, wherein the heating film layer is provided with two terminals which extend to the outer surface of the battery and are used for connecting the anode and the cathode of the battery to realize the heating function. However, this structure has disadvantages such as difficulty in lead wire in practical use, excessive heating wire, and the like, and the reliability of the battery module is also lowered.
Therefore, a battery structure for low-temperature heating is urgently needed in the field to effectively overcome the defects in the prior art and achieve the purposes of reducing thermal resistance, improving heat transfer efficiency and reducing temperature inconsistency of the battery.
Disclosure of Invention
In view of the above, the present invention provides a cylindrical battery structure for low temperature heating, which has the following structure:
a heating sheet arranged along the radial direction of the battery is arranged in a gap above the positive terminal and the battery mandrel in the shell of the cylindrical battery;
the heating sheet and the battery mandrel are electrically connected with each other, so that the heating sheet is electrically connected with the battery cathode;
a through hole is formed in the position, corresponding to the heating sheet, of the shell of the cylindrical battery; and the heating sheet is provided with an electric lead, is led out of the shell from the inside of the shell through the through hole and is used for forming conductive connection with the anode of the battery.
Through the structure, the individual heating of each cylindrical battery monomer can be realized by utilizing the power of the battery.
Furthermore, the heating plate adopts a resistance wire structure which is spirally coiled; the central part of the resistance wire is led out of a lead wire, and is electrically connected with the battery mandrel, and the tail end of the edge of the resistance wire is led out of the battery shell of the lead wire and is electrically connected with the positive electrode of the battery.
Furthermore, the upper surface and the lower surface of the heating sheet are provided with insulating layers for coating and sealing, so that the safety is improved, and the heating sheet is prevented from being in contact with the inside of the battery to cause short circuit due to vehicle vibration and the like.
Furthermore, insulating materials are filled at the interval positions of the resistance wires so as to ensure that the resistance wires cannot generate short circuit.
Furthermore, a lead led out from the central part of the resistance wire is electrically connected with the inner surface of the battery mandrel through a mandrel connecting part, the outer surface of the mandrel connecting part is covered with an insulating layer, and the lead led out from the central part is covered by a silica gel sleeve.
Furthermore, the tail end of the edge of the resistance wire and a lead led out of the battery shell are respectively coated with an insulating layer and a silica gel sleeve.
Furthermore, an annular concave part which is inwards concave along the radial direction is arranged on the position, corresponding to the heating sheet, of the battery shell, and the through hole is formed in the annular concave part; the annular recess is filled and sealed by an insulating material.
With the cylindrical battery structure provided by the present invention, the heating control process can be performed by, but is not limited to: the tail end lead of the edge of the resistance wire is led out of the battery shell and is electrically connected with the anode of the battery through a switch element such as an MOS (metal oxide semiconductor) tube or an IGBT (insulated gate bipolar transistor), and the battery management system controls the switch-on duration of the switch element through a temperature signal of a temperature sensor, so that the control on the switch-on duration of the heating circuit is realized.
Correspondingly, the invention also provides a lithium battery which adopts the cylindrical battery structure.
Correspondingly, the invention also provides a manufacturing method of the cylindrical battery structure, which comprises the following steps;
step 1: preparing materials: selecting a battery mandrel, a heating sheet, a binder, a sealing material and an insulating filling material, connecting the tail end of a lead led out from the center of the heating sheet to the inner surface of the mandrel through the binder, and coating the sealing material on the surface of the binder after the binder is solidified.
Step 2: and drilling holes at positions corresponding to the heating sheets on the battery shell, and packaging the wound battery mandrel and the heating sheets into the shell, wherein the leads are led out from the edges of the heating sheets and pass through the through holes.
And step 3: and packaging the battery, filling an insulating material in a gap between the through hole and the edge lead-out wire, and waiting for the insulating material to solidify.
The cylindrical battery structure provided by the invention adopts the cylindrical battery structure with the built-in heating sheet, is used for heating the cylindrical battery at low temperature, does not occupy the space of the battery module, does not need to modify a battery pack box body, effectively reduces the installation quality of the battery module, and is beneficial to the light weight of an electric automobile; compared with an externally mounted heating system, the built-in heating sheet is less prone to damage caused by external stress, and the reliability of the whole heating system is improved; the heat transfer when the built-in heating plate operates is more reasonable, the thermal resistance is smaller, the heat transfer efficiency is greatly improved, each monomer can be independently heated, and the inconsistency caused by the existing heating mode can be overcome.
Drawings
Fig. 1 is a front view of a cylindrical battery structure provided by the present invention;
fig. 2 is a sectional view of a cylindrical battery structure according to the present invention.
Description of reference numerals: 1-a battery case; 2-a battery positive terminal; 3-heating a sheet; 4-a battery mandrel; 5-a mandrel connection; 6-a housing through hole; 7-central lead-out wire; 8-leading out a lead from the edge; 9-insulating material filled between the heating sheet resistance wires.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The cylindrical battery structure for low-temperature heating provided by the invention has the following structure as shown in fig. 1-2:
a heating sheet 3 arranged along the radial direction of the battery is arranged in a gap between the positive terminal 2 and the upper part of the battery mandrel 4 in the shell 1 of the cylindrical battery;
the heating sheet and the battery mandrel are electrically connected with each other, so that the heating sheet is electrically connected with the battery cathode;
a through hole 6 is formed in the position, corresponding to the heating sheet, of the shell of the cylindrical battery; and the heating sheet is provided with an electric lead 8, is led out of the shell from the inside of the shell through the through hole and is used for forming conductive connection with the anode of the battery.
In a preferred embodiment of the invention, the heating plate adopts a resistance wire structure 9 which is spirally wound; the lead 7 is led out from the center of the resistance wire and is electrically connected with the battery mandrel, and the lead is led out from the tail end of the edge of the resistance wire to the outside of the battery shell and is electrically connected with the positive electrode of the battery. The diameter range of the resistance wire is 0.02 mm-0.06 mm, and the resistance wire material comprises but is not limited to nickel-chromium alloy, iron-chromium-aluminum alloy, copper-nickel alloy and the like.
And the upper surface and the lower surface of the heating sheet are provided with insulating layers for coating and sealing, and the thickness of the upper insulating coating layer and the lower insulating coating layer is 0.06 mm-0.1 mm.
And insulating materials are filled at the intervals of the resistance wires to ensure that the resistance wires cannot generate short circuit.
The lead led out from the central part of the resistance wire is electrically connected with the inner surface of the battery mandrel through a mandrel connecting part, the outer surface of the mandrel connecting part 5 is covered with an insulating layer, the lead led out from the central part of the resistance wire is coated by a silica gel sleeve, and the total diameter range is 0.04 mm-0.08 mm.
The end of the edge of the resistance wire and the outside of the lead led out of the battery shell are respectively coated with an insulating layer and a silica gel sleeve.
An annular concave part which is inwards concave along the radial direction is arranged on the position, corresponding to the heating sheet, of the battery shell, and the through hole is formed in the annular concave part; the annular recess is filled and sealed by an insulating material.
In this embodiment, the mandrel connecting portion is formed by connecting the end of the central lead-out wire and the inner surface of the mandrel through an adhesive, and the adhesive material is a conductive adhesive, including but not limited to a domestic 701 conductive adhesive, a conductive adhesive containing copper and silver alloy, and the like. Preferably, the binder has a thickness of 0.03mm to 0.07 mm.
In this embodiment, the mandrel connection is coated with a sealing material, including but not limited to silicone gel.
The preparation method of the cylindrical battery structure mainly comprises the following steps:
step 1: preparing materials: selecting a battery mandrel, a heating sheet, a binder, a sealing material and an insulating filling material, connecting the tail end of a lead led out from the center of the heating sheet to the inner surface of the mandrel through the binder, and coating the sealing material on the surface of the binder after the binder is solidified.
Step 2: as shown in fig. 1, the battery case is drilled at location 6 and the wound battery mandrel is packaged inside the case with the heater chip with wires drawn from the edge of the heater chip through the through hole 6.
And step 3: and packaging the battery, filling an insulating material in a gap between the through hole 6 and the edge lead-out wire, and waiting for the insulating material to solidify.
Cylindrical batteries of different specification parameters as shown in the following two specific examples can be manufactured by the above method:
the first embodiment is as follows:
step 1: taking a resistance wire (nickel-chromium alloy) with the diameter of 0.04mm, spirally winding, and reserving a central lead-out wire and an edge lead-out wire; placing the coiled resistance wire on an insulating coating layer, wherein the thickness of the insulating coating layer is 0.06mm, uniformly filling insulating materials between the resistance wires, drilling a hole (the diameter of the drilled hole is 0.06mm) at the corresponding position of a lead led out from the center of the other insulating coating layer, covering the hole on the resistance wire, leading the lead led out from the center to pass through the through hole, pressing the upper and lower insulating coating layers tightly and sealing the edges of the upper and lower insulating coating layers; and filling an insulating material in the gap between the central lead-out wire and the through hole, and waiting for the insulating material to solidify.
Step 2: connecting the tail end of the lead wire led out from the center of the heating plate prepared in the step 1 with a battery mandrel through a binder, selecting the domestic 701 conductive binder as the binder, taking the thickness of the binder layer as 0.05mm, and waiting for the binder to solidify; coating the sealing material silicone gel on the surface of the silicon gel material, and waiting for the silicone gel material to solidify.
And step 3: drilling a hole (the diameter of the drilled hole is 0.06mm) at a position 6 shown in fig. 1 on the battery case subjected to the machining; assembling the battery shell after drilling with the wound battery mandrel part, and leading out a lead from the edge of the heating sheet to pass through the through hole 6; and filling an insulating material in the gap between the central lead-out wire and the through hole, and waiting for the insulating material to solidify.
And 4, step 4: and packaging the battery to finish the preparation process.
Example two:
step 1: taking a resistance wire (copper-nickel alloy) with the diameter of 0.06mm, spirally winding, and reserving a central lead-out wire and a marginal lead-out wire; placing the coiled resistance wire on an insulating coating layer, wherein the thickness of the insulating coating layer is 0.08mm, uniformly filling insulating materials between the resistance wires, drilling a hole (the diameter of the drilled hole is 0.08mm) in the corresponding position of a lead led out from the center of the other insulating coating layer, covering the hole on the resistance wire, enabling the lead led out from the center to pass through the through hole, pressing the upper and lower insulating coating layers tightly, and sealing the edge of the upper and lower insulating coating layers; and filling an insulating material in the gap between the central lead-out wire and the through hole, and waiting for the insulating material to solidify.
Step 2: connecting the tail end of the lead wire led out from the center of the heating plate prepared in the step 1 with a battery mandrel through a binder, selecting the binder as a conductive binder containing copper-silver alloy, taking the thickness of the binder to be 0.07mm, and waiting for the binder to solidify; coating the sealing material silicone gel on the surface of the silicon gel material, and waiting for the silicone gel material to solidify.
And step 3: drilling a hole (the diameter of the drilled hole is 0.08mm) at the position 6 shown in figure 1 on the finished battery shell; assembling the battery shell after drilling with the wound battery mandrel part, and leading out a lead from the edge of the heating sheet to pass through the through hole 6; and filling an insulating material in the gap between the central lead-out wire and the through hole, and waiting for the insulating material to solidify.
And 4, step 4: and packaging the battery to finish the preparation process.
It should be understood that, the sequence numbers of the steps in the embodiments of the present invention do not mean the execution sequence, and the execution sequence of each process should be determined by the function and the inherent logic of the process, and should not constitute any limitation on the implementation process of the embodiments of the present invention.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. A cylinder type battery structure for low temperature heating which characterized in that: has the following structure:
a heating sheet arranged along the radial direction of the battery is arranged in a gap above the positive terminal and the battery mandrel in the shell of the cylindrical battery;
the heating sheet and the battery mandrel are electrically connected with each other, so that the heating sheet is electrically connected with the battery cathode;
a through hole is formed in the position, corresponding to the heating sheet, of the shell of the cylindrical battery; and the heating sheet is provided with an electric lead, is led out of the shell from the inside of the shell through the through hole and is in conductive connection with the positive electrode of the battery.
2. The battery structure of claim 1, wherein: the heating plate adopts a resistance wire structure which is spirally coiled; the central part of the resistance wire is led out of a lead wire, and is electrically connected with the battery mandrel, and the tail end of the edge of the resistance wire is led out of the battery shell of the lead wire and is electrically connected with the positive electrode of the battery.
3. The battery structure of claim 1, wherein: and insulating layers are arranged on the upper surface and the lower surface of the heating sheet for coating and sealing.
4. The battery structure of claim 2, wherein: and insulating materials are filled at the intervals of the resistance wires to ensure that the resistance wires cannot generate short circuit.
5. The battery structure of claim 2, wherein: the lead led out from the central part of the resistance wire is electrically connected with the inner surface of the battery mandrel through a mandrel connecting part, the outer surface of the mandrel connecting part is covered with an insulating layer, and the outside of the insulating layer is covered by a silica gel sleeve.
6. The battery structure of claim 2, wherein: the outer part of the lead led out of the battery shell from the tail end of the edge of the resistance wire is coated with an insulating layer and a silica gel sleeve.
7. The battery structure of claim 1, wherein: an annular concave part which is inwards concave along the radial direction is arranged on the position, corresponding to the heating sheet, of the battery shell, and the through hole is formed in the annular concave part; the annular recess is filled and sealed by an insulating material.
8. A lithium battery having a cylindrical battery structure as claimed in any one of claims 1 to 7.
9. A method of manufacturing a cylindrical battery having a structure as defined in any one of claims 1 to 7, characterized in that: the method comprises the following steps;
step 1: preparing materials: selecting a battery mandrel, a heating sheet, a binder, a sealing material and an insulating filling material, connecting the tail end of a lead led out from the center of the heating sheet to the inner surface of the mandrel through the binder, and coating the sealing material on the surface of the binder after the binder is solidified.
Step 2: and drilling holes at positions corresponding to the heating sheets on the battery shell, and packaging the wound battery mandrel and the heating sheets into the shell, wherein the leads are led out from the edges of the heating sheets and pass through the through holes.
And step 3: and packaging the battery, filling an insulating material in a gap between the through hole and the edge lead-out wire, and waiting for the insulating material to solidify.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011256339.XA CN112382807B (en) | 2020-11-11 | 2020-11-11 | Cylindrical battery structure for low-temperature heating |
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| CN202011256339.XA CN112382807B (en) | 2020-11-11 | 2020-11-11 | Cylindrical battery structure for low-temperature heating |
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Cited By (1)
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| WO2023092896A1 (en) * | 2021-11-29 | 2023-06-01 | 宁德时代新能源科技股份有限公司 | Thermal runaway triggering method |
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| 秦李伟等: "动力电池热失控方法研究", 《汽车实用技术》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023092896A1 (en) * | 2021-11-29 | 2023-06-01 | 宁德时代新能源科技股份有限公司 | Thermal runaway triggering method |
| US12095049B2 (en) | 2021-11-29 | 2024-09-17 | Contemporary Amperex Technology Co., Limited | Thermal runaway trigger method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112382807B (en) | 2022-04-01 |
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