CN114388918A - Power battery pack - Google Patents
Power battery pack Download PDFInfo
- Publication number
- CN114388918A CN114388918A CN202210011438.4A CN202210011438A CN114388918A CN 114388918 A CN114388918 A CN 114388918A CN 202210011438 A CN202210011438 A CN 202210011438A CN 114388918 A CN114388918 A CN 114388918A
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- electric core
- heating film
- core group
- area
- temperature
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- 238000010438 heat treatment Methods 0.000 claims abstract description 95
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000010949 copper Substances 0.000 claims abstract description 12
- 229910052802 copper Inorganic materials 0.000 claims abstract description 12
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 66
- 229910052782 aluminium Inorganic materials 0.000 claims description 66
- 238000001514 detection method Methods 0.000 claims description 25
- 238000012544 monitoring process Methods 0.000 claims description 7
- 238000005070 sampling Methods 0.000 abstract description 18
- 239000012212 insulator Substances 0.000 abstract description 2
- 239000000523 sample Substances 0.000 description 25
- 210000004027 cell Anatomy 0.000 description 20
- 239000004411 aluminium Substances 0.000 description 17
- 230000017525 heat dissipation Effects 0.000 description 11
- 238000000034 method Methods 0.000 description 8
- 238000012360 testing method Methods 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 210000005056 cell body Anatomy 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
Images
Classifications
-
- 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
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
-
- 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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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Secondary Cells (AREA)
- Battery Mounting, Suspending (AREA)
Abstract
The invention provides a power battery pack. Power battery package includes the box and locates two electric core groups in the box, two be equipped with high-voltage electrical system and low pressure BMS control module between the electric core group, high-voltage electrical system's one end and one of them the electric core group is always just connected, high-voltage electrical system's the other end and another the electric core group is always negatively connected, and two electric core group opposite sides pass through the copper bar and connect, BMS module place region is box central authorities, each the electric core group is equipped with fin and module frame, each the top of electric core group is equipped with insulating cover, every the side of electric core group is equipped with insulator foot, each the electric core group bottom is equipped with the heating film, the heating film divide into three regional heating film A district, heating film B district and heating film middle zone. The power battery pack provided by the invention can reduce the low-temperature heating temperature difference of the battery core and improve the sampling accuracy of the battery core temperature.
Description
Technical Field
The invention relates to the technical field of electric vehicle batteries, in particular to a power battery pack.
Background
Because of the characteristics of the lithium ion battery, the power battery pack does not have good charge and discharge performance under a low temperature condition, so that the battery pack needs to be heated at a low temperature before charge and discharge, and the temperature of the battery core reaches a temperature working interval.
At present, the low-temperature heating mode of the power battery pack mainly comprises three modes: PTC heating plate, heating film, liquid heat, for example, the heating film has that the quality is light, the size is little, the shape does not receive advantages such as geometric constraint and is widely applied to power battery package heating system, and the heating film commonly used is constant power density usually, nevertheless because the mounted position that is located by heating module electricity core is different, and electric core radiating effect is inconsistent, and the same power density heating leads to the electric core difference in temperature too big easily, influences electric core life. The BMS of the power battery pack generally has an independent temperature sampling module, so that real-time sampling analysis of temperature rise of the battery core and temperature difference data are facilitated, the installation position of the temperature probe is directly related to the accuracy of the sampling temperature, improper arrangement can lead to the leakage of the highest temperature and the lowest temperature, temperature difference calculation errors are caused, and the BMS system misjudgment is caused.
Disclosure of Invention
Based on the above, the invention provides the power battery pack which can reduce the low-temperature heating temperature difference of the battery core and improve the sampling accuracy of the battery core temperature.
The invention provides a power battery pack which comprises a box body and two battery cell groups arranged in the box body, wherein a high-voltage electric system and a low-voltage BMS control module are arranged between the two battery cell groups, one end of the high-voltage electric system is positively connected with one of the battery cell groups, the other end of the high-voltage electric system is negatively connected with the other battery cell group, the other sides of the two battery cell groups are connected through copper bars, and the area of the BMS module is the center of the box body. Each said electric core group is equipped with fin and module frame, each said top of electric core group is equipped with insulating cover plate, each said side of electric core group is equipped with insulator foot, each said electric core group bottom is equipped with the heating film, the heating film divide into three regional heating film A district, heating film B district and heating film middle zone, the power density in heating film A district and heating film B district is higher than in the middle zone of the heating film, each said electric core group week side still is equipped with the end plate, one of them is equipped with the negative pole copper bar on the electric core group, another said electric core group is equipped with the positive pole copper bar, a side of each said electric core group is equipped with first middle aluminium row, second middle aluminium row, positive pole aluminium row and negative pole aluminium row, first middle aluminium row with the second middle aluminium row is located between the positive pole aluminium row and the negative pole aluminium row, be equipped with the second temperature on the second middle aluminium row and visit the point, the second temperature detection point is a highest temperature detection point, the positive aluminum row and the negative aluminum row are both provided with cell tabs, the other side part of each cell group is provided with a plurality of third middle aluminum rows, two of the third middle aluminum rows are respectively provided with a first temperature detection point and a third temperature detection point, and the first temperature detection point and the third temperature detection point are lowest temperature detection points and are respectively used for lowest temperature monitoring and thermal runaway temperature monitoring.
Further, heating film A district with the heater strip density that heating film B district was arranged is higher than the heater strip density that heating film middle zone was arranged, heating film A district heating film B district the heater strip structure of middle zone is the same and establish ties each other.
According to the power battery pack, according to the heat dissipation characteristics of the module battery cores, the heat dissipation of the battery cores on two sides is faster than that of the central battery core, the density of the heating wires in the heating films is reasonably arranged, so that the power density of the heating films on two sides of the module is higher than that of the heating films in the middle, and the heat dissipation of the battery cores on two sides is compensated, so that the temperature difference of the battery cores is reduced; in addition, the highest temperature probe point is arranged in the middle aluminum row of the module side face A, the lowest temperature probe point is arranged on the edge aluminum row of the module side face B, and the aluminum row is not connected with the positive electrode and the negative electrode in a bridging mode.
According to the power battery pack, the low-temperature heating equalization of the battery core is mainly realized by using the heating films with unequal power densities according to the low-temperature heating equalization method of the battery core heating films and the arrangement method of the battery core temperature sampling points, and particularly, the power densities of the heating films at the bottoms of the battery cores at the two sides of the module are higher than that of the center, so that the characteristic of quick heat dissipation of the battery cores at the two sides of the module is offset, and the temperature equalization of the battery cores is realized; the temperature probe point arrangement method is based on sampling of the temperature of the battery cell by connecting the tab of the battery cell with the aluminum bar instead of the battery cell, and considers that the lap joint of the positive and negative output bars and the insulating base of the end plate of the module group has quicker heat dissipation, the temperature is possibly lower than the temperature of the battery cell bodies on two sides, and the lowest temperature is avoided during sampling; meanwhile, the highest temperature is usually sampled in the middle of the module, so that the sampling temperature is accurate. The low-temperature heating balance of the battery cell and the accurate sampling of the temperature have very important significance to the battery cell heat management strategy.
Drawings
FIG. 1 is a schematic structural diagram of a power battery pack according to the present invention;
FIG. 2 is a side view from a perspective of the power battery pack of FIG. 1;
FIG. 3 is a side view from another perspective of the power battery pack of FIG. 1;
fig. 4 is a schematic view of a heating film of the power battery pack shown in fig. 1.
Reference numerals
The high-voltage electric system comprises a box body 1, a high-voltage electric system 2, a radiating fin 3, a module frame 4, an insulating cover plate 5, an end plate 6, a heating film 7, a negative copper bar 8, a BMS module 9, a positive copper bar 10, an insulating base 11, an electric core group 12, an electric core lug 13, a first middle aluminum bar 14, a second middle aluminum bar 15, a positive aluminum bar 16, a third middle aluminum bar 17, a heating film A area 18, a heating film middle area 19, a heating film B area 20, a first temperature probe point 21, a second temperature probe point 22, a third temperature probe point 23 and a negative aluminum bar 24.
Detailed Description
Reference will now be made to the drawings in which embodiments of the invention are illustrated. The technical solutions in the embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention. It is to be understood that the drawings are provided solely for the purposes of reference and illustration and are not intended as a definition of the limits of the invention. The connection relationships shown in the drawings are for clarity of description only and do not limit the manner of connection.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. 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 invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Referring to fig. 1-4, the invention provides a power battery pack, which comprises a box body 1 and two electric core groups 12 arranged in the box body, wherein a high-voltage electrical system 2 and a BMS module 9 are arranged between the two electric core groups, one end of the high-voltage electrical system is connected with one electric core group in a positive mode, the other end of the high-voltage electrical system is connected with the other electric core group in a negative mode, the other sides of the two electric core groups are connected through a copper bar, the BMS is arranged in the center of the box body 1, a cooling fin 3 and a module frame 4 are arranged above each electric core group, an insulating cover plate 5 is arranged on the side of each electric core group, an insulating base 11 is arranged on the side of each electric core group, a heating film 7 is arranged at the bottom of each electric core group, the heating film is divided into three areas, namely a heating film area a 18, a heating film B area 20 and a heating film middle area 19, heating film A district with the power density in heating film B district is higher than heating film middle zone 19, and is concrete, and one of them heating film place is regional for heating film A district 18, another heating film place is regional for heating film B district 20, heating film A district with the power density in heating film C district is higher than heating film middle zone 19, each the week side of electric core group still is equipped with end plate 6, one of them be equipped with negative pole copper bar 8 on the electric core group, another be equipped with anodal copper bar 10 on the electric core group, each one side of electric core group is equipped with aluminium row in the middle of first middle 14, the second 15, anodal aluminium row 16 and negative pole aluminium row 24, aluminium row in the middle of first middle with aluminium row is located in the middle of the second anodal aluminium row with between the negative pole aluminium row, be equipped with second temperature probe point 22 on the aluminium row in the middle of the second, the second temperature detection point is a highest temperature detection point, the positive aluminum row and the negative aluminum row are both provided with cell tabs 13, the other side part of each cell group is provided with a plurality of third middle aluminum rows 17, two of the third middle aluminum rows are respectively provided with a first temperature detection point 21 and a third temperature detection point 23, and the first temperature detection point and the third temperature detection points are lowest temperature detection points and are respectively used for lowest temperature monitoring and thermal runaway temperature monitoring.
The highest temperature probe point is arranged on the second middle aluminum row 15, and the lowest temperature probe point is arranged on the third middle aluminum row 17, so that sampling temperature deviation is avoided, namely, the lowest temperature probe point avoids the anode aluminum row 16 and the cathode aluminum row 24, and the influence of the insulating base 11, the high-voltage electrical system 2 and the like on heat dissipation of the insulating base is reduced.
In one embodiment, the heating film A area and the heating film B area are arranged at heating wires with densities higher than those of the heating wires arranged in the middle area of the heating film, and the heating wires in the heating film A area, the heating film B area and the middle area are identical in structure and are connected in series.
The electric core low-temperature heating heat transfer paths sequentially comprise a heating film 7, a radiating aluminum sheet 3, an electric core group 12, an electric core lug 13, a first middle aluminum row 14, a second middle aluminum row 15, an anode aluminum row 16, a third middle aluminum row 17, a first temperature probe point 21, a second temperature probe point 22 and a third temperature probe point 23 (the aluminum rows are in parallel), and different heat transfer paths may influence the arrangement method of the temperature sampling points.
The first temperature probe 21 is mainly used for monitoring the cell thermal runaway temperature at the outgoing line of the heating film 7 and supplementing the third temperature probe 23.
And (3) low-temperature heating test:
(1) the battery pack was adjusted to 50% SOC.
(2) And (3) standing the battery pack in an environment test box at the temperature of-20 ℃ until the temperatures of the first temperature probe point 21, the second temperature probe point 22 and the third temperature probe point 23 are within-20 +/-2 ℃, and sampling and recording temperature data by the BMS module 9 in real time.
(3) Start to heat membrane 7, heat soft packet of electricity core group 12 according to the setting power, the heat transfer route is in proper order: the heating film 7, the cooling fins 3, the electric core group 12, the electric core lugs 13, the first middle aluminum row 14, the second middle aluminum row 15, the positive electrode aluminum row 16, the third middle aluminum row 17, the first temperature detection point 21, the second temperature detection point 22 and the third temperature detection point 23 (the aluminum rows are in parallel).
(4) The BMS module 9 samples the temperature data of the first temperature probe point 21, the second temperature probe point 22 and the third temperature probe point 23 in real time, calculates the highest temperature, the lowest temperature and the maximum temperature difference, finishes the test when the lowest temperature reaches 0 ℃, and records and stores the data of the whole process.
According to the power battery pack, according to the heat dissipation characteristics of the module battery cores, the heat dissipation of the battery cores on two sides is faster than that of the central battery core, the density of the heating wires in the heating films is reasonably arranged, so that the power density of the heating films on two sides of the module is higher than that of the heating films in the middle, and the heat dissipation of the battery cores on two sides is compensated, so that the temperature difference of the battery cores is reduced; in addition, the highest temperature probe point is arranged in the middle aluminum row of the module side face A, the lowest temperature probe point is arranged on the edge aluminum row of the module side face B, and the aluminum row is not connected with the positive electrode and the negative electrode in a bridging mode.
According to the power battery pack, the low-temperature heating equalization of the battery core is mainly realized by using the heating films with unequal power densities according to the low-temperature heating equalization method of the battery core heating films and the arrangement method of the battery core temperature sampling points, and particularly, the power densities of the heating films at the bottoms of the battery cores at the two sides of the module are higher than that of the center, so that the characteristic of quick heat dissipation of the battery cores at the two sides of the module is offset, and the temperature equalization of the battery cores is realized; the temperature probe point arrangement method is based on sampling of the temperature of the battery cell by connecting the tab of the battery cell with the aluminum bar instead of the battery cell, and considers that the lap joint of the positive and negative output bars and the insulating base of the end plate of the module group has quicker heat dissipation, the temperature is possibly lower than the temperature of the battery cell bodies on two sides, and the lowest temperature is avoided during sampling; meanwhile, the highest temperature is usually sampled in the middle of the module, so that the sampling temperature is accurate. The low-temperature heating balance of the battery cell and the accurate sampling of the temperature have very important significance to the battery cell heat management strategy.
The above examples only express embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (2)
1. A power battery pack is characterized by comprising a box body and two electric core groups arranged in the box body, wherein a high-voltage electric system and a low-voltage BMS control module are arranged between the two electric core groups, one end of the high-voltage electric system is always positively connected with one of the electric core groups, the other end of the high-voltage electric system is always negatively connected with the other electric core group, the other sides of the two electric core groups are connected through a copper bar, the area where the BMS module is located is the center of the box body, each electric core group is provided with a radiating fin and a module frame, the top of each electric core group is provided with an insulating cover plate, the side surface of each electric core group is provided with an insulating base, the bottom of each electric core group is provided with a heating film, the heating film is divided into three areas, namely an area A, an area B and an area middle area of the heating film, the power density of the area A of the heating film and the area B of the heating film is higher than that of the middle area of the heating film, an end plate is arranged on the periphery of each electric core group, a negative copper bar is arranged on one electric core group, a positive copper bar is arranged on the other electric core group, a first middle aluminum bar, a second middle aluminum bar, a positive aluminum bar and a negative aluminum bar are arranged on one side portion of each electric core group, the first middle aluminum bar and the second middle aluminum bar are positioned between the positive aluminum bar and the negative aluminum bar, a second temperature detection point is arranged on the second middle aluminum bar, the second temperature detection point is a highest temperature detection point, electric core tabs are arranged on the positive aluminum bar and the negative aluminum bar, a plurality of third middle aluminum bars are arranged on the other side portion of each electric core group, a first temperature detection point and a third temperature detection point are respectively arranged on the two third middle aluminum bars, and the first temperature detection point and the third temperature detection point are the lowest temperature detection points, respectively used for minimum temperature monitoring and thermal runaway temperature monitoring.
2. The power battery pack according to claim 1, wherein the heating film A area and the heating film B area are arranged at heating wires with a density higher than that of the heating wires arranged in the middle area of the heating film, and the heating wires of the heating film A area, the heating film B area and the middle area are identical in structure and are connected in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210011438.4A CN114388918A (en) | 2022-01-06 | 2022-01-06 | Power battery pack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210011438.4A CN114388918A (en) | 2022-01-06 | 2022-01-06 | Power battery pack |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114388918A true CN114388918A (en) | 2022-04-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210011438.4A Pending CN114388918A (en) | 2022-01-06 | 2022-01-06 | Power battery pack |
Country Status (1)
| Country | Link |
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| CN (1) | CN114388918A (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106773650A (en) * | 2016-12-23 | 2017-05-31 | 天津力神特种电源科技股份公司 | Lithium-ions battery group quick method for heating and keeping constant temperature under extreme low temperature |
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| CN109585952A (en) * | 2018-12-14 | 2019-04-05 | 蜂巢能源科技有限公司 | The thermal management algorithm and device of power cell of vehicle packet |
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| CN112599937A (en) * | 2020-12-15 | 2021-04-02 | 湖北亿纬动力有限公司 | Battery collection method and battery collection system |
| CN214411449U (en) * | 2020-12-15 | 2021-10-15 | 湖北亿纬动力有限公司 | Battery collection system |
| CN215266455U (en) * | 2021-04-26 | 2021-12-21 | 广州汽车集团股份有限公司 | Double-loop battery heating system |
-
2022
- 2022-01-06 CN CN202210011438.4A patent/CN114388918A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106602177A (en) * | 2016-12-16 | 2017-04-26 | 浙江南都电源动力股份有限公司 | Module top heating system suitable for soft package power battery and control method |
| CN106773650A (en) * | 2016-12-23 | 2017-05-31 | 天津力神特种电源科技股份公司 | Lithium-ions battery group quick method for heating and keeping constant temperature under extreme low temperature |
| CN108511833A (en) * | 2017-02-27 | 2018-09-07 | 湖南妙盛汽车电源有限公司 | A kind of lithium battery |
| CN107946699A (en) * | 2017-10-31 | 2018-04-20 | 苏州孔雀动力能源有限公司 | A kind of batteries of electric automobile bag, heating system and its heating means |
| CN208062122U (en) * | 2018-02-10 | 2018-11-06 | 深圳市科陆电子科技股份有限公司 | A kind of soft-package battery module |
| CN109585952A (en) * | 2018-12-14 | 2019-04-05 | 蜂巢能源科技有限公司 | The thermal management algorithm and device of power cell of vehicle packet |
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| CN112599937A (en) * | 2020-12-15 | 2021-04-02 | 湖北亿纬动力有限公司 | Battery collection method and battery collection system |
| CN214411449U (en) * | 2020-12-15 | 2021-10-15 | 湖北亿纬动力有限公司 | Battery collection system |
| CN215266455U (en) * | 2021-04-26 | 2021-12-21 | 广州汽车集团股份有限公司 | Double-loop battery heating system |
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