CN114361643A - Battery module and battery pack - Google Patents

Battery module and battery pack Download PDF

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Publication number
CN114361643A
CN114361643A CN202111626060.0A CN202111626060A CN114361643A CN 114361643 A CN114361643 A CN 114361643A CN 202111626060 A CN202111626060 A CN 202111626060A CN 114361643 A CN114361643 A CN 114361643A
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CN
China
Prior art keywords
cooling
battery
battery module
electric core
main body
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202111626060.0A
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Chinese (zh)
Inventor
杰龙清
王燕乐
王保
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangzhou Xiaopeng Motors Technology Co Ltd
Original Assignee
Guangzhou Xiaopeng Motors Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Guangzhou Xiaopeng Motors Technology Co Ltd filed Critical Guangzhou Xiaopeng Motors Technology Co Ltd
Priority to CN202111626060.0A priority Critical patent/CN114361643A/en
Publication of CN114361643A publication Critical patent/CN114361643A/en
Pending legal-status Critical Current

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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/61Types of temperature control
    • H01M10/613Cooling or keeping cold
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/62Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/625Vehicles
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/65Means for temperature control structurally associated with the cells
    • H01M10/656Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
    • H01M10/6567Liquids
    • H01M10/6568Liquids characterised by flow circuits, e.g. loops, located externally to the cells or cell casings
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/65Means for temperature control structurally associated with the cells
    • H01M10/658Means for temperature control structurally associated with the cells by thermal insulation or shielding
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Secondary Cells (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

The invention discloses a battery module and a battery pack, wherein the battery module comprises a battery core group and a cooling assembly, the battery core group comprises a plurality of battery cores which are sequentially arranged, the cooling assembly comprises a plurality of cooling belts, every two adjacent battery cores are isolated by the cooling belts, and the cooling belts comprise cooling pipelines for circulating cooling media. In the battery module and the battery pack, the cooling belt is arranged between the adjacent battery cores, so that when the temperature is too high due to quick charging, super charging or thermal runaway of the battery, on one hand, the heat of the single battery core is quickly taken away to realize quick cooling, and on the other hand, the cooling belt can also isolate the adjacent battery cores to avoid the heat from diffusing to the adjacent battery cores to generate a heat diffusion event; in addition, due to the arrangement of the cooling belt, the cooling plate arranged at the bottom of the electric core group can be omitted, so that the development cost and the weight of the battery module are reduced, and the thickness of the battery module is also reduced.

Description

Battery module and battery pack
Technical Field
The invention relates to the technical field of power batteries, in particular to a battery module and a battery pack.
Background
With the development of society and the increasing importance of people on environmental protection, electric automobiles are more and more widely applied. The power battery applied to the electric automobile has the characteristics of high energy density and large single energy, and the safety of the power battery serving as an energy source of the electric automobile is particularly important.
In the case of a battery, the phenomenon of uncontrolled temperature rise caused by the exothermic reaction inside the battery cells is called thermal runaway, which occurs when the heat generated by the battery is higher than it can dissipate. If thermal runaway of one cell in a battery system causes thermal runaway of other cells, that is thermal runaway diffusion, which may be referred to as thermal diffusion for short. For various reasons, the conventional battery cannot completely avoid thermal runaway, and how to prevent thermal diffusion of the battery becomes a hot topic of current research. Especially the need for rapid or even overcharge can lead to thermal runaway issues that are of greater concern.
At present, in order to prevent thermal runaway, heat insulating mats such as aerogel or ceramic materials are usually arranged between adjacent electric cores, so that the electric cores are reduced, heat is transferred to the adjacent electric cores, and the thermal runaway is prevented from being transferred to the adjacent electric cores, but the temperature of the thermal runaway electric cores per se is slowly reduced in the mode.
Disclosure of Invention
The invention aims to provide a battery module and a battery pack which have good heat dissipation effect, can control thermal runaway and prevent thermal diffusion.
The invention provides a battery module, which comprises a battery core group and a cooling assembly, wherein the battery core group comprises a plurality of sequentially arranged battery cores, the cooling assembly comprises a plurality of cooling belts, every two adjacent battery cores are isolated by the cooling belts, and the cooling belts comprise cooling pipelines for circulating cooling media.
In one embodiment, the bottom surface of the electric core group is exposed.
In one embodiment, the battery module further comprises end plates, bus bars and a top plate, wherein the two end plates are respectively arranged at two ends of the electric core group, the bus bars are arranged at the top of the electric core group, and the top plate covers one side of the bus bars, which is far away from the electric core group; the side surface of the electric core group is exposed.
In one embodiment, the cooling assembly further includes a liquid inlet pipe and a liquid outlet pipe, the liquid inlet pipe is communicated with the plurality of cooling zones, and the liquid outlet pipe is communicated with the plurality of cooling zones.
In one embodiment, the cooling belt comprises a main body part, and a liquid inlet area and a liquid outlet area which are respectively arranged at two ends of the main body part, wherein the liquid inlet area is communicated between the main body part and the liquid inlet pipe, and the liquid outlet area is communicated between the main body part and the liquid outlet pipe.
In one embodiment, the two ends of the main body part and the two sides of the electric core assembly are substantially flush, the liquid inlet area and the liquid outlet area respectively protrude out of the two ends of the electric core assembly, the liquid inlet area is provided with a first through hole, the liquid outlet area is provided with a second through hole, the liquid inlet pipe sequentially and transversely penetrates through the first through holes of the liquid inlet area of the plurality of cooling zones, and the liquid outlet pipe sequentially and transversely penetrates through the second through holes of the liquid outlet area of the plurality of cooling zones.
In one embodiment, a plurality of partition plates are arranged in the main body part at intervals, and the partition plates divide the interior of the main body part into a plurality of cooling pipelines.
In one embodiment, the cooling tape is bonded to the adjacent battery cell by a heat-conducting structural adhesive.
In one embodiment, the cooling belt is formed by extrusion of pure aluminum.
The invention also provides a battery pack which comprises the battery module.
In the battery module and the battery pack provided by the embodiment of the invention, the cooling belt is arranged between the adjacent electric cores, so that when the temperature is too high due to quick charging, super charging or thermal runaway of the battery, on one hand, the heat of the single electric core is quickly taken away to realize quick cooling, and on the other hand, the cooling belt can also isolate the adjacent electric cores to avoid the heat diffusion event caused by the heat diffusing to the adjacent electric cores; in addition, due to the arrangement of the cooling belt, the cooling plate arranged at the bottom of the electric core group can be omitted, so that the development cost and the weight of the battery module are reduced, and the thickness of the battery module is also reduced.
Drawings
Fig. 1 is a schematic view illustrating an assembly structure of a battery module according to an embodiment of the present invention.
Fig. 2 is a partially exploded view of the battery module shown in fig. 1.
Fig. 3 is a schematic cross-sectional view of the battery module shown in fig. 1.
FIG. 4 is a cross-sectional view of the cooling belt of the cooling module shown in FIG. 3.
Fig. 5 is an exploded view of a battery pack according to an embodiment of the invention.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the embodiments, structures, features and effects of the present invention will be made with reference to the accompanying drawings and examples.
Fig. 1 is a schematic view illustrating an assembly structure of a battery module according to an embodiment of the present invention; fig. 2 is a partially exploded view of the battery module shown in fig. 1; fig. 3 is a schematic cross-sectional view of the battery module shown in fig. 1. Referring to fig. 1 to 3, in the present embodiment, the battery module includes a battery core pack, a cooling assembly 13, an end plate 15, a bus bar 17, and a top plate 19. Two end plates 15 are respectively arranged at two ends of the electric core group, the bus bar 17 is arranged at the top of the electric core group, and the top plate 19 covers one side of the bus bar 17 far away from the electric core group. The battery pack includes a plurality of battery cells 112 arranged in sequence, the cooling assembly 13 includes a plurality of cooling belts 132, each two adjacent battery cells 112 are separated by the cooling belt 132, and the cooling belt 132 includes a cooling duct 134 (see fig. 4) for circulating a cooling medium.
In the embodiment, the cooling belt is arranged between the adjacent electric cores, so that when the temperature is too high due to quick charging, overcharge or thermal runaway of the battery, on one hand, the heat of the monomer electric core is quickly taken away to realize quick cooling, and on the other hand, the cooling belt can also isolate the adjacent electric cores to avoid the heat from diffusing to the adjacent electric cores to generate a thermal diffusion event; in addition, due to the arrangement of the cooling belt, the cooling plate arranged at the bottom of the electric core group can be omitted, so that the development cost and the weight of the battery module are reduced, and the thickness of the battery module is also reduced. Of course, in order to better enhance the cooling effect, a cooling plate may be disposed at the bottom of the electric core pack, which is not limited herein, that is, the cooling plate at the bottom of the electric core pack may be omitted, and does not mean that the cooling plate at the bottom of the electric core pack must be omitted. Specifically, by the embodiment of the invention, the cooling belt is arranged on the large surface of the battery core, compared with the mode of arranging the cooling plate at the bottom of the battery core, the heat management contact area is increased by more than 200%, the heat generated in the quick charging process of the battery can be effectively taken away, and the continuous quick charging and safe charging of the battery pack are ensured; by replacing the heat insulating pad between the cells and the cooling plate at the bottom with the cooling assembly, the space utilization of the battery module is improved by 3% -5%, and the weight is reduced by 35% (about 4 kg).
In this embodiment, the bottom surface and the side surface of the electric core group are exposed. That is to say, bottom plate and curb plate have been omitted to the battery module, have reduced the weight of battery module, have improved the ability density of battery module.
In this embodiment, the cooling assembly 13 further includes a liquid inlet pipe 136 and a liquid outlet pipe 137, the liquid inlet pipe 136 is respectively communicated with the plurality of cooling zones 132, the liquid outlet pipe 137 is respectively communicated with the plurality of cooling zones 132, and the liquid inlet pipe 136 is connected to an external liquid supply device (not shown). During operation, the liquid supply device continuously supplies liquid to the liquid inlet pipe 136, cooling liquid enters the cooling zones 132 after passing through the liquid inlet pipe 136, and the cooling liquid and the battery cell flow into the liquid outlet pipe 137 after heat exchange and are output to the outside, so that circulating cooling is realized, and heat is taken away quickly.
Specifically, the cooling zone 132 includes a main body 1321, and a liquid inlet region 1322 and a liquid outlet region 1324 respectively disposed at two ends of the main body 1321, wherein the liquid inlet region 1322 is communicated between the main body 1321 and the liquid inlet pipe 136, and the liquid outlet region 1324 is communicated between the main body 1321 and the liquid outlet pipe 137. The inlet 1322 and outlet 1324 regions are generally trapezoidal in cross-section. More specifically, the two ends of the main body 1321 are substantially flush with the two sides of the electric core assembly, the liquid inlet 1322 and the liquid outlet 1324 respectively protrude out of the two ends of the electric core assembly, the liquid inlet 1322 is provided with a first through hole, the liquid outlet 1324 is provided with a second through hole, the liquid inlet pipe 136 sequentially and transversely penetrates through the first through holes of the liquid inlet 1322 of the plurality of cooling belts 132, and the liquid outlet pipe 137 sequentially and transversely penetrates through the second through holes of the liquid outlet 1324 of the plurality of cooling belts 132, so that the liquid inlet pipe 136 and the liquid outlet pipe 137 do not need to occupy redundant space.
Specifically, referring to fig. 4, a plurality of partitions 138 are disposed in the main body 1321 at intervals, and the partitions 138 partition the inside of the main body 1321 into a plurality of cooling ducts 134. Thus, the cooling liquid can simultaneously enter the plurality of cooling ducts 134 from the liquid inlet region 1322 to flow through the cooling belt 132, i.e., the plurality of cooling ducts 134 are arranged in parallel, and the flow resistance is low and the heat exchange efficiency is high. Specifically, the wall thickness d of the main body portion 1321 may be 0.3mm, and the width W of the cooling duct 134 may be 1mm, but is not limited thereto. It can be seen that the body portion 1321 of the cooling zone 132 is small in both wall thickness and width, and is light in weight. It will be appreciated that the S-shaped cooling conduits 134 may also be formed in the main body portion 1321 such that each cooling strip 132 has only one fluid inlet and only one fluid inlet.
Specifically, the cooling strip 132 is bonded to the adjacent battery cell 112 by a heat-conducting structural adhesive. The heat conduction structure is glued sets up the area of contact between multiplicable cooling belt 132 and electric core 112, promotes heat conduction efficiency to can compress when the pressurized, guarantee the inflation space of electric core, improve electric core life, still guarantee the bonding strength between electric core and the electric core simultaneously, promote the mechanical strength of battery module. During manufacturing, specifically, a heat-conducting structural adhesive is injected between the battery cell and the cooling belt 132, the heat-conducting structural adhesive may include A, B two components, and a chemical reaction occurs after the injection, so that the heat-conducting structural adhesive is changed from a liquid state to a solid state.
Specifically, the cooling belt 132 may be formed by extrusion of pure aluminum. Of course, the cooling belt 132 may be manufactured in other ways.
In this embodiment, the cooling medium flowing through the cooling assembly may be water. The boiling point of water is about 100 ℃, the temperature of the cooling belt 132 can be controlled to be about 100 ℃ during cooling, and thermal runaway is caused due to the fact that the membrane of the common battery cell is decomposed at 150 ℃, so that the adjacent battery cells can be prevented from thermal diffusion due to overhigh temperature by controlling the temperature of the cooling belt 132 to be about 100 ℃.
The invention also provides a battery pack which comprises the battery module.
In this embodiment, the battery pack further includes an upper case 30 and a lower case 50, the battery module is disposed in the accommodating cavity of the lower case 50, and the upper case 30 covers the top of the lower case 50 and is fixedly connected to the lower case 50.
In this embodiment, the lower case 50 includes a bottom plate 502, and the bottom of the battery cell pack of the battery module is in direct contact with the bottom plate 502 because the bottom surface of the battery module is exposed.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. The battery module is characterized by comprising a battery core group and a cooling assembly (13), wherein the battery core group comprises a plurality of sequentially arranged battery cores (112), the cooling assembly (13) comprises a plurality of cooling belts (132), every two adjacent battery cores (112) are isolated by the cooling belts (132), and the cooling belts (132) comprise cooling pipelines (134) for circulating a cooling medium.
2. The battery module according to claim 1, wherein the bottom surface of the electric core pack is exposed.
3. The battery module according to claim 1, further comprising end plates (15), bus bars (17) and a top plate (19), wherein the two end plates (15) are respectively arranged at two ends of the electric core group, the bus bars (17) are arranged at the top of the electric core group, and the top plate (19) covers one side of the bus bars (17) far away from the electric core group; the side surface of the electric core group is exposed.
4. The battery module according to claim 1, wherein the cooling assembly (13) further comprises an inlet pipe (136) and an outlet pipe (137), the inlet pipe (136) is in communication with the plurality of cooling zones (132), and the outlet pipe (137) is in communication with the plurality of cooling zones (132).
5. The battery module according to claim 4, wherein the cooling belt (132) comprises a main body portion (1321) and a liquid inlet region (1322) and a liquid outlet region (1324) respectively disposed at two ends of the main body portion (1321), the liquid inlet region (1322) is communicated between the main body portion (1321) and the liquid inlet pipe (136), and the liquid outlet region (1324) is communicated between the main body portion (1321) and the liquid outlet pipe (137).
6. The battery module according to claim 5, wherein two ends of the main body part (1321) are substantially flush with two sides of the electric core pack, the liquid inlet region (1322) and the liquid outlet region (1324) respectively protrude out of two ends of the electric core pack, a first through hole is formed in the liquid inlet region (1322), a second through hole is formed in the liquid outlet region (1324), the liquid inlet pipe (136) sequentially and transversely penetrates through the first through holes of the liquid inlet regions (1322) of the plurality of cooling bands (132), and the liquid outlet pipe (137) sequentially and transversely penetrates through the second through holes of the liquid outlet regions (1324) of the plurality of cooling bands (132).
7. The battery module according to claim 5, wherein a plurality of partitions (138) are provided in the main body portion (1321), and the partitions (138) partition the inside of the main body portion (1321) into the plurality of cooling ducts (134).
8. The battery module according to claim 1, characterized in that the cooling strip (132) is bonded to the adjacent cells (112) by a thermally conductive structural adhesive.
9. The battery module according to claim 1, wherein the cooling belt (132) is formed by extrusion of pure aluminum.
10. A battery pack comprising the battery module according to any one of claims 1 to 9.
CN202111626060.0A 2021-12-28 2021-12-28 Battery module and battery pack Pending CN114361643A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111626060.0A CN114361643A (en) 2021-12-28 2021-12-28 Battery module and battery pack

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111626060.0A CN114361643A (en) 2021-12-28 2021-12-28 Battery module and battery pack

Publications (1)

Publication Number Publication Date
CN114361643A true CN114361643A (en) 2022-04-15

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115000578A (en) * 2022-06-22 2022-09-02 中国第一汽车股份有限公司 Battery module, battery pack and thermal management system

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN210805855U (en) * 2019-09-30 2020-06-19 蜂巢能源科技有限公司 Battery module and battery pack
CN111477808A (en) * 2020-05-20 2020-07-31 远景睿泰动力技术(上海)有限公司 Automobile, battery module and manufacturing process thereof
CN111786052A (en) * 2020-07-31 2020-10-16 湖北亿纬动力有限公司 Battery module and battery
WO2021008541A1 (en) * 2019-07-17 2021-01-21 威睿电动汽车技术(宁波)有限公司 Battery pack cooling system and vehicle
WO2021135189A1 (en) * 2019-12-30 2021-07-08 合肥国轩高科动力能源有限公司 Liquid-cooling box body of lithium battery module
CN113193290A (en) * 2021-05-31 2021-07-30 湖北亿纬动力有限公司 Battery module
CN113611948A (en) * 2021-08-02 2021-11-05 广州小鹏汽车科技有限公司 Battery module and battery pack

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021008541A1 (en) * 2019-07-17 2021-01-21 威睿电动汽车技术(宁波)有限公司 Battery pack cooling system and vehicle
CN210805855U (en) * 2019-09-30 2020-06-19 蜂巢能源科技有限公司 Battery module and battery pack
WO2021135189A1 (en) * 2019-12-30 2021-07-08 合肥国轩高科动力能源有限公司 Liquid-cooling box body of lithium battery module
CN111477808A (en) * 2020-05-20 2020-07-31 远景睿泰动力技术(上海)有限公司 Automobile, battery module and manufacturing process thereof
CN111786052A (en) * 2020-07-31 2020-10-16 湖北亿纬动力有限公司 Battery module and battery
CN113193290A (en) * 2021-05-31 2021-07-30 湖北亿纬动力有限公司 Battery module
CN113611948A (en) * 2021-08-02 2021-11-05 广州小鹏汽车科技有限公司 Battery module and battery pack

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115000578A (en) * 2022-06-22 2022-09-02 中国第一汽车股份有限公司 Battery module, battery pack and thermal management system

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Address after: 510000 No.8 Songgang street, Cencun, Tianhe District, Guangzhou City, Guangdong Province

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