CN106450581B - Heating system for cylindrical battery module and battery module - Google Patents
Heating system for cylindrical battery module and battery module Download PDFInfo
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- CN106450581B CN106450581B CN201610778429.2A CN201610778429A CN106450581B CN 106450581 B CN106450581 B CN 106450581B CN 201610778429 A CN201610778429 A CN 201610778429A CN 106450581 B CN106450581 B CN 106450581B
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- heating
- battery module
- heating system
- battery
- fixing plate
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 199
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000000741 silica gel Substances 0.000 claims abstract description 29
- 229910002027 silica gel Inorganic materials 0.000 claims abstract description 29
- 229910052751 metal Inorganic materials 0.000 claims abstract description 28
- 239000002184 metal Substances 0.000 claims abstract description 28
- 239000004020 conductor Substances 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 6
- 239000000919 ceramic Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 5
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 229910001416 lithium ion Inorganic materials 0.000 description 4
- 230000000630 rising effect Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000011258 core-shell material Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
Classifications
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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
-
- 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
-
- 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
- H01M10/63—Control systems
- H01M10/637—Control systems characterised by the use of reversible temperature-sensitive devices, e.g. NTC, PTC or bimetal devices; characterised by control of the internal current flowing through the cells, e.g. by switching
-
- 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
- H01M10/653—Means for temperature control structurally associated with the cells characterised by electrically insulating or thermally conductive materials
-
- 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
-
- 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
Abstract
The invention discloses a heating system for a cylindrical battery module, which comprises a heating system connected with a battery management system, wherein the heating system comprises an insulating fixing plate with at least one accommodating hole; at least one or a plurality of PTC heating elements which are connected in parallel and are used for heating and detecting the temperature of the battery module are arranged in the accommodating hole, metal electrode plates are respectively arranged on the surfaces of two sides of the PTC heating elements, pins are respectively arranged on the left side and the right side of each metal electrode plate, plug pins are arranged on the pins, and the plug pins are arranged on the surface of the insulating fixing plate; the heating system is connected with the battery management system through the lead by the plug pin, the outer side surfaces of the metal electrode plates are respectively provided with heat conduction silica gel, and the outer side surfaces of the heat conduction silica gel are respectively provided with more than two concave parts. The invention also provides a battery module, and further comprises the heating system. Compared with the prior art, other temperature sensors are not needed, the arrangement of components is reduced, and the production cost is reduced.
Description
Technical Field
The invention relates to a power battery, in particular to a heating system of a cylindrical battery module and a battery module for a pure electric vehicle or a hybrid electric vehicle and electric energy storage equipment.
Background
At present, pure electric and oil-electricity hybrid electric vehicles are more and more in our life, and most of the existing and future pure electric and oil-electricity hybrid electric vehicles adopt lithium ion power batteries as power sources, and the performance, reliability and service life of the lithium ion batteries at high and low temperatures are greatly reduced compared with those of the lithium ion batteries at normal temperature. When the battery module is used in a low-temperature environment, a heating system is required to heat the battery module, so that the battery core reaches a proper temperature and then starts to charge and discharge. After the lithium ion battery module is used for a period of time, each battery core can be aged to different degrees, the internal resistance of each battery core can be increased, the variation range of the internal resistance of each battery core is far more than the average value, a large amount of heat can be generated during discharging, and especially under a high-temperature environment, the heat is easier to accumulate, and the heat must be dissipated in time, so that the battery core reaches a proper temperature. Also, the battery module of the power storage device has the above problems.
The battery heating mode in the current market is generally circulation liquid heating or warm air heating, and PET heating films, silica gel heating plates, PTC heating plates and the like are arranged around the battery, the circulation liquid heating mode has the defects of complex structure, low efficiency, low reliability, high cost and the like, the warm air heating mode has the defects of low heating rate, uneven temperature, easiness in heat accumulation, high energy consumption and the like, the two modes are used less and less, and the heating modes such as the PET heating films, the silica gel heating plates or the PTC heating plates are used more.
The two modes of PET heating film and silica gel heating plate have the following defects: the heating components inside the PET heating film and the silica gel heating plate are electric heating alloy wires, the temperature is not easy to control, the local temperature difference is large, and the insulating layer is easy to damage to cause electric leakage, so that safety accidents are easy to cause;
PTC heating plates have the following disadvantages: (e.g., patent application Ser. No. 201510634026.6).
1. Low temperature rising rate and large local temperature difference
Because the PTC heating plate is attached to the outside of the battery pack, the time required for heat transfer to the central part of the battery pack is longer, so that the temperature rising rate of the central part of the battery pack is slower; meanwhile, the temperature difference of each battery core of the battery pack is larger, and the performance and the service life of the battery are greatly influenced.
2. Low heating efficiency and high energy consumption
The PTC heating plate transfers a large portion of heat to the battery pack case and the air due to the structure in which both sides thereof generate heat, resulting in low heating efficiency and much power consumption.
3. Poor safety
The PTC heating plate is arranged on the surface of the battery module, namely, the positive electrode and the negative electrode of the battery pack or the battery core extend to the surface of the shell, the heating plate heats the positive electrode and the negative electrode and conducts heat to the inside of the module, one heating plate is generally contacted with the positive electrode and the negative electrode of a plurality of battery packs or the battery cores at the same time, if the heating plate is used in a vibration environment for a long time, the insulating outer layer of the heating plate is damaged, the short circuit of the positive electrode and the negative electrode of the battery is possibly caused, the battery is damaged, and the safety accident is caused.
4. The PTC heating plate is heavy, and the PTC heating plate adopts aluminum alloy as a mechanism part for fixing the PTC heating element and radiating, so that the unit density is high, the overall weight of the battery module is increased, the specific energy parameter of the battery module is reduced, and the endurance mileage of the vehicle is affected.
The above drawbacks are particularly evident for cylindrical batteries, because the outer housing is cylindrical, the contact area with the heating plate is small, the heat transfer efficiency is worse, and in order to improve the heat efficiency, a manner of adding a silica gel pad with a large weight at the gap is generally adopted. But does not effectively solve the problem while increasing the total weight of the battery pack.
The heater needs to be used with a plurality of external temperature sensors, the temperature sensors transmit signals to a battery management system (namely BMS), and the battery management system (namely BMS) judges whether the heater works or not, so that the battery is kept in a reasonable temperature range.
Disclosure of Invention
The invention aims to provide a cylindrical battery module heating system and a battery module, which aim to solve the technical problems of enabling heating to be more uniform and rapid, improving heating efficiency, shortening heating time and reducing energy consumption, enabling the battery module to be safer and more reliable, and enabling a battery management system to acquire the current working temperature of each battery unit in the battery module in real time by reading the resistance value of a PTC heating element without using other temperature sensors, thereby reducing the arrangement of components and production cost.
In order to solve the above problems, an aspect of the present invention provides a heating system for a cylindrical battery module, including a heating system connected to a battery management system, the heating system being provided with at least one, the heating system including an insulating fixing plate having at least one receiving hole; at least one or a plurality of PTC heating elements which are connected in parallel and are used for heating and detecting the temperature of the battery module are arranged in the accommodating hole of the insulating fixing plate, and the PTC heating elements can be tiled in the accommodating hole of the insulating fixing plate; metal electrode plates are respectively arranged on the surfaces of two sides of the PTC heating element, pins are respectively arranged on the left side and the right side of each metal electrode plate, pins 8 are provided with plug pins for connecting with a lead or an adjacent heating system, and the plug pins are arranged on the surface of the insulating fixing plate; the surface of the two metal electrode plates is tightly attached to the surfaces of the two sides of the PTC heating element, the positive electrode of the PTC heating element is in contact with the surface of one metal electrode plate, the negative electrode is in contact with the surface of the other metal electrode plate, the heating system is connected with the battery management system through a lead wire by a plug pin, heat conducting silica gel is respectively arranged on the outer side surfaces of the metal electrode plates, more than two concave parts are respectively arranged on the outer side surface of each heat conducting silica gel, and the section of each concave part is arc-shaped.
Further, the insulating fixing plate is a rectangular plate, and the height of the insulating fixing plate is equal to the length of the cylindrical battery.
Further, the insulating fixing plate is made of a plastic material.
Further, the PTC heating element is a PTC ceramic thermistor element;
further, an insulating plate is provided between the adjacent two recesses.
Further, at least two heating systems are arranged, and two adjacent heating systems are connected in series through a plug pin.
Further, the accommodating holes are provided with more than two, the two accommodating holes are arranged on the insulating fixing plate at intervals, insulating parts are arranged between the two adjacent accommodating holes, and each accommodating hole is internally provided with a PTC heating element.
The invention also provides a battery module, which comprises cylindrical batteries arranged in a rectangular array, and the heating system, wherein gaps are arranged between two adjacent cylindrical batteries, row gaps are formed between two adjacent rows of cylindrical batteries, and column gaps are formed between two adjacent columns of cylindrical batteries; the heating system is arranged in the row gap or the column gap, a cylindrical battery arranged at a position corresponding to the concave part is arranged in the concave part, and the shell of the cylindrical battery is closely attached to the concave part.
Further, the row gaps or column gaps are also filled with a thermally conductive material.
Further, the heat conducting material is heat conducting silica gel.
Compared with the prior art, the modularized heating systems which can be inserted and connected with each other are arranged among the batteries in the cylindrical battery module, so that the plurality of heating systems are not required to be connected by using traditional wires, the use quantity is flexible and changeable, the electric conduction reliability is high, the heat conducting materials attached to the battery shells are arranged outside the heating systems, the heating systems can transfer heat to each battery, the heating rate is high, the temperature difference among the batteries is small, the heating efficiency is improved, the energy consumption is reduced, and after the battery module works normally, the battery management system acquires the current working temperature of each battery unit in the battery module in real time by reading the resistance value of the PTC heating element, other temperature sensors are not required to be used, the arrangement of components is reduced, and the production cost is reduced.
Drawings
Fig. 1 is a schematic view of the internal structure of the heating system of the present invention.
Fig. 2 is a schematic view of a first connection structure between a battery module heating system and a battery module according to the present invention.
Fig. 3 is a schematic view of a second connection structure between a battery module heating system and a battery module according to the present invention.
Fig. 4 is a schematic view of a third connection structure between a battery module heating system and a battery module according to the present invention.
Fig. 5 is a schematic view of a fourth connection structure between a battery module heating system and a battery module according to the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples.
As shown in fig. 1, the heating system for a cylindrical battery module of the present invention includes a heating system 2 connected to a battery management system of the related art, which includes an insulating fixing plate 5 having at least one receiving hole 10, the insulating fixing plate 5 may be a rectangular plate having a height equal to the length of a cylindrical battery, and the insulating fixing plate 5 may be made of a plastic material; at least one or a plurality of PTC heating elements 4 which are connected in parallel and used for heating and detecting the temperature of the battery module are arranged in the accommodating hole 10 of the insulating fixing plate 5, and the PTC heating elements 4 are preferably PTC ceramic thermistor elements; the PTC heating element 4 can be tiled in the accommodating hole 10 of the insulating fixing plate 5, and the insulating fixing plate 5 is used for fixing the PTC heating element 4, has certain mechanical strength, has relatively high temperature resistance and has insulativity; the surfaces of two sides of the PTC heating element 4 are respectively provided with a metal electrode plate 6, the left side and the right side of each metal electrode plate 6 are respectively provided with a pin 8, each pin 8 is provided with a pin 13, each pin 13 is arranged on the surface of the insulating fixing plate 5, and two adjacent heating systems 2 are connected in series through each pin 13; the surface of two metal electrode plates 6 of the insulating fixing plate 5 are tightly attached to the surfaces of two sides of the PTC heating element 4, meanwhile, the positive electrode of the PTC heating element 4 is in surface contact with one metal electrode plate 6, the negative electrode is in surface contact with the other metal electrode plate 6, the heating system 2 is connected with the battery management system through a wire by a plug pin 13, the outer side surface of each metal electrode plate 5 is respectively provided with heat conducting silica gel 7, the outer side surface of each heat conducting silica gel 7 is respectively provided with more than two concave parts 9, the sections of the concave parts 9 are arc-shaped, the concave parts 9 are used for being well thermally conductive and insulating with the surface of the shell of the cylindrical battery, heat can be rapidly transmitted out, an insulating plate 11 can be arranged between the two adjacent concave parts 9, and the insulating plate 11 can be used for controlling the heat propagation direction.
When the working environment of the battery module is in a low-temperature (0 ℃) state, the PTC heating element 4 heats the battery module; when the battery module is in a working state, the battery management system acquires the temperature of each battery unit of the current battery module by reading the resistance value of the PTC heating element 4; when the heating system is in a non-heating state, the heating system 2 serves as a passive battery heat conduction device to mutually conduct the temperatures of battery cells in the battery cells and between two adjacent battery cells, so that the temperature difference in the battery module is reduced. The PTC heating element 4 replaces a temperature sensor, so that wires required for arranging the temperature sensor are reduced, and the cost of the battery module is reduced.
The accommodating holes 10 are preferably provided with more than two accommodating holes 10 which are arranged on the insulating fixing plate 4 at intervals, insulating parts 12 are arranged between two adjacent accommodating holes 10, and each accommodating hole 10 is internally provided with one PTC heating element 3.
As shown in fig. 3, the battery module comprises a plurality of cylindrical batteries 1 in rectangular array, gaps are arranged between two adjacent cylindrical batteries 1, row gaps are formed between two adjacent rows of cylindrical batteries 1, and column gaps are formed between two adjacent columns of cylindrical batteries 1; the battery module further comprises at least one heating system 2, the heating systems 2 are arranged in a row gap or a column gap, two adjacent heating systems 2 arranged in the row gap or the column gap are connected and conducted through a metal connector 13, the heating systems 2 are preferably arranged in the row gap or the column gap of two rows or two columns of cylindrical batteries 1 positioned in the center of the battery module or uniformly distributed in the gaps between the cylindrical batteries 1, concave parts 9 on the heat conducting silica gel 7 are respectively tightly attached to the outer shells of the cylindrical batteries 1, each heating system 2 can heat at least four adjacently arranged cylindrical batteries 1, the heat conducting silica gel pad 7 has good heat conductivity and insulativity, and heat can be rapidly transmitted out; in the battery module, except for the row gaps or the column gaps of the heating system 2, the rest row gaps or column gaps are filled with a heat conducting material 3, and the heat conducting material is preferably heat conducting silica gel.
The heating system 2 is arranged between the cylindrical batteries 1 in the battery module, the external dimensions of the heating system are consistent with the dimensions of the battery shell, and the external heat-conducting silica gel is a flexible material. The heat conduction silica gel can fully with battery core shell in close contact, after the voltage is applied to the metal connector 13 of heating system, PTC heating element 4 circular telegram, the heat that PTC heating element 4 produced is at first conducted to metal electrode plate 6, because the good heat conductivility of metal, heat can be conducted to heat conduction silica gel 7 through metal electrode plate 6 rapidly, heat conduction silica gel 7 evenly conducts the heat to the battery shell of close contact again, because the battery shell is cylindrical, therefore the heat can disperse rapidly, and continue the diffusion through the heat conduction material 3 in the clearance, can conduct the heat to all inside the battery rapidly, reach the purpose of heating for the battery core of cylindrical battery 1, realize the high-efficient even heating of battery module.
The invention is described by taking 4 rows and 6 columns of battery modules as examples, but the invention is not limited to the above.
As shown in fig. 2, in a first arrangement mode of the battery module according to the present invention, the heating systems 2 are disposed in the outermost row gaps on two sides of the battery module, and 3 heating systems 2 are disposed on each side, and the heating systems 2 heat 12 cylindrical batteries 1 in total in two rows adjacent to the heating systems 2, so that the outer shell of each cylindrical battery 1 can be tightly adhered to the heat-conducting silica gel 7 of the heating system 2, and an effect of uniform heating is achieved.
As shown in fig. 3, in the second arrangement mode of the battery module of the present invention, the heating system 2 is disposed in the row gaps of each row of the battery module, and 3 heating systems 2 are disposed in each row, so that the heating system 2 heats the cylindrical batteries 1 adjacent to the heating system 2, and the shell of each cylindrical battery 1 can be tightly adhered to the heat-conducting silica gel 7 of the heating system 2, so as to achieve the effect of uniform heating.
As shown in fig. 4, in the third arrangement mode of the battery module, the heating system 2 is arranged in a row gap at the center of the battery module, 3 heating systems 2 are arranged in the row gap, the heating systems 2 heat two rows of cylindrical batteries 1 adjacent to the heating systems 2, heat conducting materials 3 are filled in the row gaps at the outermost sides of two sides of the battery module, the shells of the two rows of cylindrical batteries 1 at the center can be tightly attached to the heat conducting silica gel 7 of the heating systems 2, and heat is transferred to the shells of the two rows of cylindrical batteries 1 at the outermost sides through the heat conducting materials 3, so that a uniform heating effect is achieved.
As shown in fig. 5, in a fourth arrangement mode of the battery module, the heating system 2 is arranged in a row gap of the battery module at the center, 2 heating systems 2 are arranged in the row gap, the 2 heating systems 2 are connected with the plug-in connector 13 through wires and are respectively and symmetrically arranged in the row gap, two rows of cylindrical batteries 1 are spaced between the two heating systems 2, the heating systems 2 heat four cylindrical batteries 1 adjacent to the heating systems 2, heat conducting materials 3 are filled in the rest row gaps and the row gaps except the row gap of the battery module, the heat conducting materials 3 are filled in the rest row gaps and the rest row gaps, the shells of the cylindrical batteries 1 adjacent to the heating systems 2 can be tightly attached to the heat conducting silica gel 7 of the heating systems 2, and heat is transferred to the shells of the two outermost rows of cylindrical batteries 1 through the heat conducting materials 3, so that a uniform heating effect is achieved.
When the heating system of the invention is not electrified to generate heat, the heating system and the battery units are in the same environment, and have good transverse and longitudinal heat conductivity, so that the heat can be effectively and mutually and quickly conducted in each battery in the battery units, and the temperature of the PTC heating element is basically the same as the temperature of the battery. The battery management system (i.e., BMS) can calculate the real-time temperature of the battery in each battery unit by detecting the resistance value of the PTC heating element, and timely regulate and control the working state of the whole battery pack without using other temperature sensors.
The heating system structure and the installation position of the invention are different from the existing PTC heating plate, the heating system is arranged between the adjacent cylindrical batteries 1 in the battery module, the heating system is directly contacted with the shell of the cylindrical battery 1 to heat each battery core, and the heat is directly transmitted to each battery core, so that the temperature rising rate of each battery core is high, the temperature difference between each battery core is small, and meanwhile, the heat generated by the built-in structure is almost completely transmitted to the battery core, so that the heating efficiency is high and the energy consumption is low. The following is the experimental comparison data of the heating effect of the invention and the PTC heating plate: the first table is the heating temperature rise time of the PTC heating plate in the prior art, the second table is the heating temperature rise time of the heating system, and the heating speed of the first table and the heating temperature rise time of the heating system are obviously different under the same environment temperature.
TABLE 1 (ambient temperature-20 ℃ C.)
| Sequence number | 0min | 30min | 60min | 90min | 120min | Rate of temperature rise |
| 1 | -20.1℃ | -14.2℃ | 2.3℃ | 14.9℃ | 20.6℃ | 0.34℃/min |
| 2 | -19.8℃ | -15.2℃ | -8.3℃ | 1.1℃ | 8.6℃ | 0.24℃/min |
| 3 | -20℃ | -14.3℃ | 7.4℃ | 19.6℃ | 25.4℃ | 0.378℃/min |
| 4 | -20.2℃ | -15.8℃ | -5.9℃ | 3.5℃ | 11.2℃ | 0.26℃/min |
| Maximum temperature difference | 0.4℃ | 1.6℃ | 15.7℃ | 18.5℃ | 16.8℃ |
TABLE 2 (ambient temperature-20 ℃ C.)
| Sequence number | 0min | 30min | 60min | 90min | 120min | Rate of temperature rise |
| 1 | -20.0℃ | -0.8℃ | 17.2℃ | 32.1℃ | 42.3℃ | 0.52℃/min |
| 2 | -19.9℃ | -2.2℃ | 14.5℃ | 29.5℃ | 39.8℃ | 0.50℃/min |
| 3 | -20.2℃ | -0.4℃ | 18.2℃ | 32.6℃ | 42.8℃ | 0.53℃/min |
| 4 | -20.1℃ | -2.9℃ | 15.1℃ | 30.4℃ | 40.6℃ | 0.51℃/min |
| Maximum temperature difference | 0.3℃ | 1.5℃ | 3.7℃ | 3.1℃ | 3.0℃ |
As can be seen from the table, the temperature rise rate of the present invention is faster than that of the conventional PTC heating plate.
The heating system of the invention adopts the heat conduction silica gel to encapsulate the PTC heating element and the metal electrode plate in the insulating structure at the central position of the heating system, ensures the good insulating property of the PTC heating element and the battery shell, is arranged between the adjacent cylindrical batteries in the battery pack, the two cambered surfaces of the adjacent cylindrical batteries are in contact with the heating system, namely the potential difference is zero, the heating element is internally provided with the heating element, the defect of short circuit of the battery pack unit is avoided, the short circuit risk is avoided, and the invention is different from the heater structure of the invention patent application with the application number of 201510634026.6, and the structural design of the product of the invention is safer.
The heating system has the advantages that the heating is uniform, most of the area of the heat conduction silica gel on the outermost layer of the heating system contacts with the shell of each cylindrical battery in the battery module, the PTC heating element is arranged at the right center position inside the heat conduction silica gel, each heating element can flexibly heat 2-16 cylindrical batteries, the temperature uniformity is good, and the cylindrical batteries which are not contacted with the heating system can also transfer the heat of the shell of the heated cylindrical batteries through the heat conduction materials filled in the gaps, so that all the cylindrical batteries can be heated.
The heating system can replace the traditional temperature sensor under the condition of not generating heat, and does not need to use other temperature sensors. The PTC heating element of the heating system is a positive temperature coefficient thermistor element, the temperature value can be converted into a resistance value to be fed back to the battery management system (namely BMS), whether the heating system is electrified to work or not and whether the battery reaches a proper working temperature after being heated or not can be judged, meanwhile, the temperature of the battery can be monitored in real time when the battery is normally operated, and safety accidents caused by overhigh temperature can be prevented. And the wires necessary for the original temperature sensor are reduced, and the weight of the battery pack is reduced.
The heating system is designed into a unit structure, can be flexibly combined according to the number of specific cylindrical batteries in the battery pack, can be closely and orderly assembled in a matched mode, is provided with a metal connector with high conductive reliability at the joint, and can supply power without wire connection.
Claims (10)
1. A heating system for a cylindrical battery module, comprising a heating system (2) connected to a battery management system, characterized in that: the heating system (2) is provided with at least one, and the heating system (2) comprises an insulating fixing plate (5) with at least one accommodating hole (10); at least one or a plurality of PTC heating elements (4) which are connected in parallel and are used for heating and detecting the temperature of the battery module are arranged in the accommodating hole (10) of the insulating fixing plate (5), and the PTC heating elements (4) can be flatly paved in the accommodating hole (10) of the insulating fixing plate (5); metal electrode plates (6) are respectively arranged on the surfaces of two sides of the PTC heating element (4), pins (8) are respectively arranged on the left side and the right side of each metal electrode plate (6), plug pins (13) used for being connected with a wire or an adjacent heating system (2) are arranged on the pins (8), and the plug pins (13) are arranged on the surface of the insulating fixing plate (5); the surface of two metal electrode plates (6) is tightly attached to the surfaces of two sides of the PTC heating element (4), meanwhile, the positive electrode of the PTC heating element (4) is in surface contact with one metal electrode plate (6), the negative electrode is in surface contact with the other metal electrode plate (6), the heating system (2) is connected with the battery management system through a wire by a plug pin (13), heat conducting silica gel (7) are respectively arranged on the outer side surface of the metal electrode plate (6), more than two concave parts (9) are respectively arranged on the outer side surface of each heat conducting silica gel (7), and the section of each concave part (9) is arc-shaped.
2. The heating system for a cylindrical battery module according to claim 1, wherein: the insulating fixing plate (5) is a rectangular plate, and the height of the insulating fixing plate (5) is equal to the length of the cylindrical battery.
3. The heating system for a cylindrical battery module according to claim 2, wherein: the insulating fixing plate (5) is made of plastic material.
4. A heating system for a cylindrical battery module according to claim 3, wherein: the PTC heating element (4) is a PTC ceramic thermistor element.
5. The heating system for a cylindrical battery module according to claim 4, wherein: an insulating plate (11) is arranged between two adjacent concave parts (9).
6. The heating system for a cylindrical battery module according to claim 5, wherein: at least two heating systems (2) are arranged, and two adjacent heating systems (2) are connected in series through a plug pin (13).
7. The heating system for a cylindrical battery module according to claim 6, wherein: the device is characterized in that more than two containing holes (10) are formed, the two containing holes (10) are arranged on the insulating fixing plate (5) at intervals, an insulating part (12) is arranged between two adjacent containing holes (10), and a PTC heating element (4) is arranged in each containing hole (10).
8. The utility model provides a battery module, includes cylindrical battery (1) that rectangular array arranged, its characterized in that: the heating system according to any one of claims 1 to 7, wherein gaps are arranged between two adjacent cylindrical batteries (1), row gaps are formed between two adjacent rows of cylindrical batteries (1), and column gaps are formed between two adjacent columns of cylindrical batteries (1); the heating system (2) is arranged in the row gap or the column gap, the cylindrical battery (1) arranged at the position corresponding to the concave part (9) is arranged in the concave part (9), and the shell of the cylindrical battery (1) is tightly attached to the concave part (9).
9. The battery module according to claim 8, wherein: the row gaps or column gaps are also filled with a heat conducting material (3).
10. The battery module according to claim 9, wherein: the heat conducting material (3) is heat conducting silica gel.
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| CN108679941A (en) * | 2018-06-15 | 2018-10-19 | 深圳市齐得隆电子有限公司 | A kind of novel lithium battery vacuum drying method and equipment |
| CN110858677B (en) * | 2018-08-22 | 2023-04-11 | 太普动力新能源(常熟)股份有限公司 | Battery module with heater |
| CN110707394A (en) * | 2019-09-08 | 2020-01-17 | 南京金龙新能源汽车研究院有限公司 | Heating battery module |
| CN111952693A (en) * | 2020-08-21 | 2020-11-17 | 华霆（合肥）动力技术有限公司 | Battery module and electric vehicle |
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Effective date of registration: 20231012 Address after: 518000 4th floor, building 12, Shenliang automotive electronics industrial park, 229 Guanping Road, Guanlan street, Longhua District, Shenzhen City, Guangdong Province Applicant after: SHENZHEN SAFEVALUE TECHNOLOGY CO.,LTD. Address before: 518110 Building A, Block 4, Building 12, Guanlan Automobile Electronic Industrial Park, 299 Guanping Road, Guanlan Street, Longhua New District, Shenzhen City, Guangdong Province Applicant before: Tian Fengye |
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