CN218385428U - Battery device - Google Patents
Battery device Download PDFInfo
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- CN218385428U CN218385428U CN202222623306.5U CN202222623306U CN218385428U CN 218385428 U CN218385428 U CN 218385428U CN 202222623306 U CN202222623306 U CN 202222623306U CN 218385428 U CN218385428 U CN 218385428U
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
-
- 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
- H01M10/64—Heating or cooling; Temperature control characterised by the shape of the cells
- H01M10/647—Prismatic or flat cells, e.g. pouch cells
-
- 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
- H01M10/655—Solid structures for heat exchange or heat conduction
- H01M10/6556—Solid parts with flow channel passages or pipes for heat exchange
- H01M10/6557—Solid parts with flow channel passages or pipes for heat exchange arranged between the cells
-
- 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
- H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
- H01M10/6567—Liquids
-
- 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
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
- H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
- H01M50/209—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for prismatic or rectangular cells
-
- 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 utility model discloses a battery device, include: at least two sheetsThe battery body comprises a battery body, wherein the surface with the largest surface area in each single battery is a side surface, two single batteries are arranged adjacently, and the side surfaces of the two single batteries are arranged oppositely; the heat exchange component is arranged between two adjacent single batteries and extends along the length direction of the side surface, and the two opposite sides of the heat exchange component are respectively connected with the side surfaces of the two adjacent single batteries; the thermal resistance value between the side surfaces of two adjacent single batteries is R 1 The thermal resistance value between the side surface of the single battery and the heat exchange component is R 2 ，R 1 And R 2 Satisfy, 1.5 x 10 ‑3 m 2 ·K/W≤R 1 ≤0.12m 2 K/W, and 0 < R 2 ≤0.03m 2 K/W. The utility model discloses can reduce the risk of thermal runaway when promoting battery device heat transfer effect.
Description
Technical Field
The utility model relates to a battery technology field especially relates to a battery device.
Background
With the development of the new energy automobile industry, the requirement of consumers on the rapid charging of the power battery is gradually increased. However, in the process of rapid charging and discharging of the power battery, along with the increase of heat generated by the battery, if the heat cannot be dissipated in time, the cycle life of the power battery is easily affected.
Therefore, how to effectively exchange heat for the battery is crucial to the cycle life of the power battery.
SUMMERY OF THE UTILITY MODEL
In order to overcome above-mentioned prior art at least one defect, the utility model provides a battery device can reduce the risk of thermal runaway when promoting battery device heat transfer effect.
The utility model discloses a solve the technical scheme that its problem adopted and be:
a battery device, comprising:
the battery pack comprises at least two single batteries, wherein the surface with the largest surface area in each single battery is a side surface, the two single batteries are arranged adjacently, and the side surfaces of the two single batteries are arranged oppositely;
the heat exchange component is arranged between two adjacent single batteries and extends along the length direction of the side surface, and the two opposite sides of the heat exchange component are respectively connected with the side surfaces of the two adjacent single batteries;
the thermal resistance value between the side surfaces of two adjacent single batteries is R 1 The thermal resistance value between the side surface of the single battery and the heat exchange component is R 2 ，R 1 And R 2 Satisfy, 1.5 x 10 -3 m 2 ·K/W≤R 1 ≤0.12m 2 K/W, and 0 < R 2 ≤0.03m 2 ·K/W；
Wherein R is 1 Is the sum of the ratio of the thickness of each medium to the thermal conductivity coefficient between the side surfaces of two adjacent single batteries, R 2 The ratio of the thickness of each medium between the side surface of the single battery and the heat exchange component to the heat conductivity coefficient is the sum.
The battery device of the utility model can ensure better heat transfer between the single battery and the heat exchange part by controlling the smaller thermal resistance between the single battery and the heat exchange part, thereby effectively exchanging heat for the single battery through the heat exchange part; on the other hand, the larger thermal resistance between two adjacent single batteries is controlled, and the heat transfer between the two adjacent single batteries can be weakened, so that when one single battery is out of control, only a small influence is exerted on the adjacent single battery, and the risk of the adjacent single battery out of control is reduced.
Drawings
Fig. 1 is a schematic structural diagram of a battery pack in an embodiment.
FIG. 2 is a schematic structural view of a battery device according to an embodiment;
FIG. 3 is an exploded view of FIG. 2;
FIG. 4 is a schematic structural diagram of a single-layer liquid-cooled panel according to an embodiment;
FIG. 5 is a left side view of FIG. 4;
FIG. 6 is a schematic structural diagram of a current collector adapted to a single-layer liquid cooling plate;
FIG. 7 is a schematic structural view of an integrated two-layer liquid plate according to an embodiment;
FIG. 8 is a left side view of FIG. 7;
FIG. 9 is a schematic diagram of a current collector adapted to an integrated dual-layer liquid-cooled plate and a split liquid-cooled plate;
FIG. 10 is a schematic diagram of the split liquid-cooled plate of the embodiment;
fig. 11 is a left side view of fig. 10.
Wherein the reference numerals have the following meanings:
01. a battery pack; 02. a battery module; 1. a single battery; 11. a side surface; 2. a heat exchange member; 21. a heat exchange plate; 22. a current collector; 221. a housing; 222. an inner cavity; 223. a plugging section; 224. a liquid changing port; 23. a single layer liquid cooled panel; 231. a liquid channel; 232. a non-liquid channel; 24. an integrated double-layer liquid cooling plate; 241. a liquid zone; 242. a non-liquid zone; 243. a buffer area; 25. separating the liquid cold plate; 251. a first liquid cold plate; 252. a second liquid cooling plate; 253. a cavity; 254. a buffer section; 255. a first buffer section; 256. a second buffer portion; 26. and (5) reinforcing ribs.
Detailed Description
For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
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.
The utility model provides a battery device to solve the poor and easy thermal runaway's of current battery device heat transfer effect defect. The utility model discloses in, battery device can be battery package 01 or battery module 02 that are often used for in the new energy automobile, as shown in fig. 1, battery module 02 is including piling up a plurality of battery cells 1 that set up, and battery module 02 establishes in battery package 01, can be equipped with multiunit battery module 02 in the battery package 01.
The utility model discloses use the battery cell 1 of cuboid shape to discuss as the example, as shown in fig. 2, the X direction is battery cell 1's length direction, and this direction is battery package 01 and interior the length direction of part, the Y direction is battery cell 1's thickness direction, and this direction is battery package 01 and interior the thickness direction of part, the Z direction is battery cell 1's direction of height, and this direction is battery package 01 and interior the direction of height of part, the face that length direction and direction of height enclose is the biggest face of battery cell 1 surface area, and the biggest face of this surface area is defined as battery cell 1's side 11, and when a plurality of battery cell 1 stacked into battery module 02, side 11 of two adjacent battery cell 1 set up relatively. The unit cells 1 having other shapes (e.g., circular shape, etc.) may be adjusted according to actual circumstances.
The utility model discloses a battery device is pond package 01 or battery module 02, and it is including piling up a plurality of battery cells 1 that set up, and the side 11 of every two adjacent battery cells 1 sets up relatively. A heat exchange part 2 is arranged between every two adjacent single batteries 1, and the heat exchange part 2 extends along the length direction of the side surface 11 of each single battery 1, so that a plurality of groups of adjacent single batteries 1 share one heat exchange part 2. The two opposite side surfaces of the heat exchange component 2 are respectively connected with the side surfaces 11 of the two adjacent single batteries 1, and the connection mode can be that the two are directly attached or connected through heat conducting glue and the like. The heat exchange component 2 comprises a heat exchange plate 21 and current collectors 22, the heat exchange plate 21 extends along the length direction of the side surface 11, two opposite sides of the heat exchange plate 21 respectively abut against the opposite side surfaces 11 of two adjacent single batteries 1, and the current collectors 22 are arranged at two end parts of the heat exchange plate 21 in the extending direction.
The heat exchange plate 21 comprises a liquid portion and a non-liquid portion which are adjacently arranged, and the liquid portion and the non-liquid portion both penetrate through the heat exchange plate 21 along the extending direction of the heat exchange plate 21. The current collector 22 includes a casing 221, an inner cavity 222 and a blocking portion 223, the casing 221 is provided with a penetrating liquid changing port 224 along the thickness direction of the heat exchange plate 21, the inner cavity 222 and the blocking portion 223 are both arranged in the casing 221, the liquid changing port 224 is communicated with the liquid portion through the inner cavity 222, and the blocking portion 223 is arranged corresponding to the non-liquid portion. The non-liquid part is filled with at least one of air, a heat insulation piece and a phase change material, and the liquid part is filled with a heat exchange liquid.
The heat exchange member 2 may be a heating member or a cooling member, and is determined according to the use environment of the battery device. If battery device uses in the ultra-low temperature environment, in order to improve battery device's performance, heat transfer component 2 is the heater block, otherwise, heat transfer component 2 is cooling part, the utility model discloses use cooling part to discuss as the example, correspondingly, heat transfer board 21 is the liquid cooling board, and liquid portion intussuseption is filled with the coolant liquid, and non-liquid portion intussuseption is filled with at least one of air, heat insulating part and phase change material, and wherein phase change material can absorb the heat to reduce the heat transfer between two adjacent battery cells 1, heat insulating part can separate heat transfer, and the air has great thermal resistance, can reduce the heat transfer between two adjacent battery cells 1. Wherein, the air is the best to the separation effect of heat transfer, the utility model discloses in all discuss with filling the air as the example.
The cooling part is used for distributing away the heat that battery cell 1 produced, consequently, need guarantee to have less thermal resistance between cooling part and the battery cell 1, the utility model discloses the thermal resistance value that sets up between side 11 of battery cell 1 and the cooling part is R 2 ，0＜R 2 ≤0.03m 2 K/W, preferably, 1.6 x 10 -5 m 2 ·K/W≤R 2 ≤0.03m 2 K/W, the thermal resistance range can ensure that the heat generated by the single battery 1 can be timely dissipated, R 2 Greater than 0, since the degree of adhesion between the unit cell side 11 and the cooling member is difficult to achieve 100% due to process limitations, R 2 Cannot be equal to 0.R 2 Can not be more than 0.03m 2 K/W, since R 2 Too large, the rate of heat dissipation from the unit cells 1 by the cooling member is reduced, and thermal runaway is easily caused. Since two adjacent single batteries 1 are directly connected by the cooling member, in order to prevent the heat generated by the two single batteries 1 from being transmitted to each other through the cooling member, it is necessary to prevent the heat from being transmitted to each other through the cooling memberGuarantee to have great thermal resistance between these two adjacent battery cells 1, the utility model discloses the thermal resistance value that sets up between the side 11 of two adjacent battery cells 1 is R 1 ，1.5*10 -3 m 2 ·K/W≤R 1 ≤0.12m 2 K/W, which can effectively block heat transfer between two adjacent single batteries 1, thereby avoiding thermal runaway of one single battery 1 and thermal runaway of another single battery 1 adjacent to the single battery 1. R 1 ＜1.5*10 -3 m 2 K/W, the heat transfer between two adjacent cells 1 is large, and thermal runaway is easily caused by thermal diffusion, which causes a safety risk. R 1 ＞1.5*10 -3 m 2 K/W, although the thermal resistance is large and the heat transfer between two adjacent single cells 1 is small, adjusting the thermal resistance, for example, the thickness of the medium, by adjusting the variable of the medium between two adjacent single cells 1 may result in an excessively large occupied space, a reduced energy density, and an increased cost.
Wherein R is 1 Is the sum of the ratio of the thickness of each medium to the thermal conductivity coefficient between the side surfaces of two adjacent single batteries, R 2 The ratio of the thickness of each medium between the side surface of the single battery and the heat exchange component to the heat conductivity coefficient is the sum.
And, the utility model discloses a battery device still satisfies following condition: the height of the cooling component is 85% -99% of the height of the single battery 1, and the height range ensures that the cooling component has a larger contact area with the side surface 11 of the single battery 1, so that heat is effectively dissipated, and the problem that the heat dissipation effect of the cooling component is weakened due to the fact that the contact area is too small is avoided. In addition, the contact area is too small, and in the battery module 02 or the battery pack 01, the fastening effect of the single batteries 1 is too poor, that is, only a small part of the area of each single battery 1 is fastened, and other unfastened areas are easily expanded due to heat, so that not only the positions of the single batteries 1 are not uniformly stressed, but also the reduction of the cycle performance of the single batteries 1 is influenced.
The thickness of the cooling part is 4-8mm, and the thickness range can effectively weaken the heat transfer between the two correspondingly arranged single batteries 1 and can not be too thick to occupy too much space.
The detailed structure of the cooling member of the present invention will be discussed below by way of specific embodiments.
Example 1
Referring to fig. 4 to 6, the liquid-cooling plate of the present embodiment is a single-layer liquid-cooling plate 23, and a liquid channel 231 and a non-liquid channel 232 are disposed in the single-layer liquid-cooling plate 23, the liquid channel 231 and the non-liquid channel 232 both penetrate through the single-layer liquid-cooling plate 23 along the extending direction of the single-layer liquid-cooling plate 23, and opposite sides of the liquid channel 231 and the non-liquid channel 232 are respectively attached to the side surfaces 11 of two adjacent battery cells 1. The liquid channel 231 is filled with cooling liquid to the heat that produces single cell 1 through the cooling liquid distributes away, is the air in the non-liquid channel 232, and the thermal resistance of air is great, and it establishes between two single cell 1 that correspond the setting, can weaken the heat transfer between these two single cell 1, thereby reduces the risk of bringing thermal runaway.
Preferably, the non-liquid channel 232 is disposed in the middle region of the single-layer liquid-cooling plate 23, that is, the position of the non-liquid channel 232 is within 35% -65% of the height of the single battery 1 in the height direction. Because the expansion of the single battery 1 mainly occurs in the middle part, and the non-liquid channel 232 is arranged at the position, on one hand, the single battery 1 expands to extrude the non-liquid channel 232 to deform, thereby reducing the extrusion of the liquid channel 231 and ensuring the heat dissipation effect of the liquid channel 231; on the other hand, middle part heat is comparatively concentrated when battery cell 1 thermal runaway, and non-liquid channel 232 establishes and can effectively weaken the heat transfer between two battery cells 1 that correspond the setting at the middle part, reduces battery module 02 thermal runaway risk.
Further, in order to avoid the arrangement of the non-liquid channel 232 from affecting the heat dissipation effect of the liquid channel 231, the volume of the non-liquid channel 232 is controlled to be 10% -30% of the volume of the liquid channel 231, in other words, if the non-liquid channel 232 and the liquid channel 231 have the same shape in the extending direction, the cross-sectional area of the non-liquid channel 232 can be understood to be 10% -30% of the cross-sectional area of the liquid channel 231, so that a good heat dissipation effect can be ensured, and the heat transfer between two correspondingly arranged single batteries 1 can be weakened.
And to foretell liquid channel 231 and non-liquid channel 232 structure, this embodiment is realized through interval setting many strengthening ribs 26 in individual layer liquid cooling board 23, many strengthening ribs 26 set up along the direction of height interval of individual layer liquid cooling board 23, and strengthening rib 26 is the slope setting, there is the contained angle promptly strengthening rib 26 and horizontal direction, the setting of this structure can play certain cushioning effect when cell 1 expands, avoid cell 1's quick inflation to make strengthening rib 26 fracture, thereby destroy individual layer liquid cooling board 23's inner structure. Since the reinforcing ribs 26 divide the interior of the single-layer liquid cooling plate 23 into a plurality of channels, the positions and the numbers of the liquid channels 231 and the non-liquid channels 232 can be adjusted according to actual needs, and the single condition is not necessarily achieved.
From this, this embodiment has realized reducing battery module 02 thermal runaway's risk when promoting battery module 02 cooling effect through above-mentioned single-deck liquid cooling board 23.
Be equipped with a plurality of individual layers liquid cold plate 23 in every battery module 02, the both ends of every individual layer liquid cold plate 23 all are equipped with the mass flow body 22, connect gradually between the mass flow body 22 with the tip to connect cooling system, thereby transport the coolant liquid to every individual layer liquid cold plate 23 in proper order through the mass flow body 22. It should be noted that since the non-liquid passage 232 exists and no liquid flows therein, the coolant inlet and outlet of the current collector 22 communicates only with the liquid passage 231.
Specifically, as shown in fig. 6, the blocking portion 223 of the current collector 22 is disposed in the middle of the casing 221 and is disposed corresponding to the non-liquid passage 232, the inner cavity 222 is communicated with the liquid passage 231, the liquid changing port 224 is not only communicated with the inner cavity 222, but also communicated with the liquid changing ports 224 between the adjacent single-layer liquid-cooling plates 23 in sequence, so as to convey the cooling liquid into each single-layer liquid-cooling plate 23 in sequence through the current collector 22.
It is emphasized that the flow of cooling fluid within each of the individual single-layer fluid-cooled plates 23 may vary, particularly where the single-layer fluid-cooled plates 23 are near the edges of the battery module 02, which may also reduce the flow of the single-layer fluid-cooled plates 23 due to the relatively low amount of heat generated at the edges.
In this embodiment, a thermal adhesive layer is disposed between the single-layer liquid cooling plate 23 and the side surface 11 of the single battery 1, the thickness of the thermal adhesive layer is 0.2mm, and the thermal conductivity of the thermal adhesive layer is 0.8W/m · K, so that the single-layer liquid cooling plateThe thermal resistance between 23 and the side 11 of the single battery 1 is the thermal resistance of the thermal conductive adhesive layer, R 2 ＝2.5*10 -4 m 2 K/W, and the temperature rise rate of the single battery 1 is 0.51 ℃/min during the working process of the battery pack 01 or the battery module 02.
The heat transfer mode between two adjacent single batteries 1 is single battery 1 → thermal conductive adhesive layer → liquid cooling panel wall Al3003 → non-liquid channel 232 (air thermal resistance is greater than cooling liquid thermal resistance) → Al3003 → thermal conductive adhesive layer → single battery 1, wherein the thermal resistances of the two thermal conductive adhesive layers are known, the thermal conductivity of the air in the liquid cooling panel wall Al3003 and the non-liquid channel 232 is a known technology, and the thermal conductivity and the thermal resistance of the two are calculated according to a formula δ/λ. The thickness of the single layer liquid-cooled plate 23 is 6.6mm, the thickness of the single layer liquid-cooled plate 23 is 0.5mm, and the thickness of the non-liquid channel 232 is 6.1mm, whereby R 1 ＝0.018m 2 Vs. K/W. When one of the single batteries 1 is thermally out of control, the adjacent single battery 1 is not affected.
In this example, the coolant is a glycol solution.
The method for testing the temperature rise rate of the single battery 1 in the embodiment comprises the following steps:
1) Adjusting the battery pack 01 to SOC 5% at normal temperature;
2) The heat balance is achieved at 25 ℃, and the temperature of the battery is measured to be 25 +/-2 ℃ by a temperature detector;
3) Charging to 80% according to the quick-charging MAP window;
4) Introducing cooling liquid at the temperature of Tmax being more than or equal to 32 ℃, and stopping introducing at the temperature of Tmax being less than or equal to 29 ℃;
5) And monitoring the temperature change of the single battery 1 in real time according to the NTC to obtain the temperature rise rate.
Note: the constant temperature of the cooling liquid at the time of entry was 22 ℃ and 14L/min.
Example 2
This embodiment also provides a single-layer liquid-cooling plate 23, and the difference between this embodiment and embodiment 1 is that: the thickness of the non-liquid channel 232 is 4.5mm, the thickness of the single-layer liquid-cooling plate 23 is 5mm, and other conditions are not changed, so that R 1 ＝0.014m 2 Vs. K/W. When one of the unit batteries 1 is out of thermal control, the adjacent unit battery is not electrifiedThe cell 1 causes an influence.
Example 3
This embodiment also provides a single-layer liquid-cooled panel 23, and differs from embodiment 1 in that: the thickness of the non-liquid channel 232 is 5mm, the thickness of the single layer liquid cooling plate 23 is 5.5mm, and other conditions are not changed, therefore, R 1 ＝0.015m 2 Vs. K/W. When one of the single batteries 1 is thermally out of control, the adjacent single battery 1 is not affected.
Example 4
This embodiment also provides a single-layer liquid-cooled panel 23, and differs from embodiment 1 in that: the thickness of the non-liquid channel 232 is 6mm, the thickness of the single-layer liquid cooling plate 23 is 6.5mm, and other conditions are not changed, so that R 1 ＝0.019m 2 Vs. K/W. When one of the unit batteries 1 is thermally out of control, the adjacent unit battery 1 is not affected.
Comparative example 1
This comparative example, which also provides a single layer liquid-cooled panel 23, differs from example 1 in that: the thickness of the non-liquid channel 232 is 0.7mm, the thickness of the single-layer liquid-cooling plate 23 is 1.2mm, and other conditions are not changed, so that R 1 ＝0.0012m 2 Vs. K/W. When one of the unit cells 1 thermally runaway, it may cause thermal runaway of the unit cell 1 adjacent thereto.
Comparing comparative example 1 with example 1, it can be seen that the non-liquid channel 232 plays a decisive role in heat transfer between two adjacent single cells 1, in other words, the thickness of the non-liquid channel 232 is reasonably set to reduce the heat transfer between two adjacent single cells 1 better by the through-hole air.
Comparing examples 1 to 4, it can be seen that the heat transfer effect between the adjacent two unit cells 1 can be improved by appropriately adding the non-liquid channel 232.
Example 5
This embodiment also provides a single-layer liquid-cooling plate 23, and the difference between this embodiment and embodiment 1 is that: the thickness of the heat-conducting adhesive layer is 0.8mm, other conditions are unchanged, and the thermal resistance of the heat-conducting adhesive layer is 1 x 10 -3 m 2 ﹒K/W(R 2 ) Thus, therefore, it is，R 1 ＝0.017m 2 Vs. K/W. When one of the unit batteries 1 is thermally out of control, the adjacent unit battery 1 is not affected.
Example 6
This embodiment also provides a single-layer liquid-cooling plate 23, and the difference between this embodiment and embodiment 1 is that: the thickness of the heat-conducting adhesive layer is 0.5mm, other conditions are unchanged, and the thermal resistance of the heat-conducting adhesive layer is 6.25 x 10 -4 m 2 ﹒K/W(R 2 ) Thus, R 1 ＝0.016m 2 Vs. K/W. When one of the unit batteries 1 is thermally out of control, the adjacent unit battery 1 is not affected.
Comparing embodiment 1 with embodiments 5-6, according to formula R = δ/λ, the thickness and the thermal conductivity of the thermal conductive adhesive layer all influence the thermal resistance value, although the utility model discloses in do not provide the embodiment of thermal conductivity, its principle that influences the thermal resistance value is the same.
In order to make the thermal resistance between the single battery 1 and the liquid cooling plate smaller and maintain a larger thermal resistance between two adjacent single batteries 1, the thermal conductivity of the thermal conductive adhesive layer needs to be increased and/or the thickness of the thermal conductive adhesive layer needs to be reduced, and the reduction of the thickness of the thermal conductive adhesive layer is beneficial to saving space, and at the same time, the non-liquid channel 232 needs to be ensured to have a larger thermal resistance.
Example 7
This example differs from example 1 in that: the present embodiment provides an integral double layer liquid cooled panel 24.
Specifically, referring to fig. 7 to 9, the integrated double-layer liquid cooling plate 24 includes two liquid regions 242 and two non-liquid regions 241, the two liquid regions 241 are respectively abutted against the opposite side surfaces 11 of the two adjacent single cells 1, and the non-liquid region 242 is disposed between the two liquid regions 241. The liquid region 241 and the non-liquid region 242 each penetrate the integrated double-layer liquid-cooling plate 24 in the extending direction of the integrated double-layer liquid-cooling plate 24.
In this embodiment, the liquid region 241 is filled with the cooling liquid to dissipate heat generated by the single cell 1 through the cooling liquid, the non-liquid region 242 is filled with air, which has a high thermal resistance and is disposed between the left and right liquid regions to reduce heat transfer, thereby reducing the risk of thermal runaway of one single cell 1 and the corresponding single cell 1. Meanwhile, the non-liquid region 242 can play a role in buffering, when the single batteries 1 on the two sides of the integrated double-layer liquid cooling plate 24 generate heat to expand and extrude the integrated double-layer liquid cooling plate 24, the non-liquid region 242 is extruded and deformed prior to the liquid region 241, so that the stability of the structure of the liquid region 242 is ensured, the phenomenon that the liquid region is extruded and deformed to cause the flowing of cooling liquid to be blocked is avoided, and the heat dissipation effect is influenced.
Furthermore, a buffer area 243 penetrating along the extending direction of the integrated double-layer liquid cooling plate 24 is further arranged in the integrated double-layer liquid cooling plate 24, the buffer area 243 is arranged adjacent to both the liquid area 241 and the non-liquid area 242, and two opposite inner side walls of the buffer area 243 tightly cling to the integrated double-layer liquid cooling plate 24, so as to abut against the side surfaces 11 of two adjacent battery cells 1. Specifically, the buffer area 243 is provided at least one end portion in the height direction in the integrated double-layer liquid-cooling plate 24, or at the middle area of the integrated double-layer liquid-cooling plate 24 to divide the liquid area 241 and the non-liquid area 242 into at least upper and lower two portions, and the buffer area 243 is filled with air. When the monomer battery 1 heat production expansion of the double-deck liquid cooling board 24 both sides of integral type and this double-deck liquid cooling board 24 of integral type were extruded, non-liquid district 242 received extrusion deformation earlier than liquid district 241, and the liquid district 241 of the left and right sides is close to in opposite directions, and buffer area 243 is also by extrusion deformation simultaneously to guaranteed that liquid district 241 is difficult for receiving extrusion deformation, thereby can not influence the flow of cooling liquid in liquid district 241, and then guaranteed the radiating effect. If the buffer area 243 is filled with the cooling liquid, since there is no buffering effect of air, when the single battery 1 expands and presses the buffer area 243, the buffer area 243 is easily deformed, so that the flow resistance of the cooling liquid is greatly increased, and the heat dissipation effect of the integrated double-layer liquid cooling plate 24 is affected.
A plurality of ribs 26 are provided in the liquid region 241 and the buffer region 243 at intervals in the height direction thereof, so that the liquid region 241 is divided into a plurality of channels by the ribs 26, and the strength of the liquid region 241 and the buffer region 243 is improved.
It should be noted that the integrated double-layer liquid-cooling plate 24 of the present embodiment mainly includes three regions, a liquid region 241, a non-liquid region 242, and a buffer region 243, and since only the liquid region 241 is used for carrying the cooling liquid, when the current collectors 22 are sleeved on the two end portions of the integrated double-layer liquid-cooling plate 24 in the extending direction, the cooling liquid inlet and outlet are only communicated with the liquid region 241.
Referring to fig. 9, the plugging portion 223 of the current collector 22 is disposed in the casing 221 and corresponds to the positions of the buffer area 243 and the non-liquid area 242, the inner cavity 222 is communicated with the liquid area 241, the liquid changing port 224 is communicated with not only the inner cavity 222, but also the liquid changing ports 224 between the adjacent integrated double-layer liquid cooling plates 24 are communicated in sequence, so as to convey the cooling liquid into each integrated double-layer liquid cooling plate 24 in sequence through the current collector 22.
In this embodiment, a thermal conductive adhesive layer is disposed between the integrated double-layer liquid cooling plate 24 and the side surface 11 of the single battery 1, the thickness of the thermal conductive adhesive layer is 0.2mm, and the thermal conductivity of the thermal conductive adhesive layer is 0.8W/m · K, so the thermal resistance between the integrated double-layer liquid cooling plate 24 and the side surface 11 of the single battery 1 is the thermal resistance of the thermal conductive adhesive layer, R is the thermal resistance of the single battery 1 2 ＝2.5*10 -4 m 2 K/W, during the operation of the battery pack 01 or the battery module 02, the temperature increase rate of the single cell battery 1 is 0.5 ℃/min.
The heat transfer manner between two adjacent single batteries 1 is single battery 1 → heat conductive adhesive layer → liquid cooling panel wall Al3003 → ethylene glycol solution → air in the non-liquid region 242 → ethylene glycol solution → Al3003 → heat conductive adhesive layer → single battery 1, wherein the thermal resistances of the two heat conductive adhesive layers are known, the thermal conductivities of the liquid cooling panel wall Al3003, the ethylene glycol solution and the air in the non-liquid region 242 are known, and the thermal conductivities of the two are calculated according to the formula δ/λ. The thickness of the integrated double-layer liquid cooling plate 24 is 6.6mm, the wall thickness of the liquid cooling plate is 0.5mm, and the thickness of the inner cavity of the non-liquid cooling area 242 is 1mm, so that R 1 ＝0.047m 2 Vs. K/W. When one of the single batteries 1 is thermally out of control, the adjacent single battery 1 is not affected.
Example 8
The present embodiment also provides an integrated double-layer liquid cooling plate 24, and the present embodiment is different from embodiment 7 in that: the thickness of the non-liquid-cooled region 242 is 1.2mm, and other conditions are unchanged, so R 1 ＝0.053m 2 K/W. When one of the single batteries 1 is out of thermal control, the phase of the single battery is not aligned with the phase of the single batteryThe adjacent unit cells 1 cause an influence.
Example 9
The present embodiment also provides an integrated double-layer liquid cooling plate 24, and the present embodiment is different from embodiment 7 in that: the thickness of the non-liquid-cooled region 242 is 1.5mm, and other conditions are unchanged, so R 1 ＝0.056m 2 K/W. When one of the single batteries 1 is thermally out of control, the adjacent single battery 1 is not affected.
As in the foregoing analysis, the thickness and the thermal conductivity of the thermal conductive adhesive layer mainly affect the thermal resistance between the single cell 1 and the liquid cooling plate, and the thickness of the filled air mainly affects the thermal resistance between two adjacent single cells.
Under the condition that the total thickness of the liquid cooling plates is the same, the thermal resistance of the integrated double-layer liquid cooling plate 24 is larger than that of the single-layer liquid cooling plate 23, and the superposition effect of the cooling liquid and the air can further weaken the heat transfer effect.
Example 10
The present embodiment also provides an integrated double-layer liquid cooling plate 24, and the present embodiment is different from embodiment 7 in that: the buffer area 243 is filled with glycol solution R 1 ＝0.044m 2 Vs. K/W. When one of the unit batteries 1 is thermally out of control, the adjacent unit battery 1 is not affected.
This shows that the thermal resistance of the liquid-cooled plate of this structure mainly depends on the liquid-cooled area 241 and the non-liquid-cooled area 242, and it is verified that the flow of the cooling liquid is easily affected by the deformation of the cooling liquid introduced into the buffer area 243, thereby reducing the heat dissipation effect.
Comparative example 2
The present comparative example also provides an integrated double-layer liquid-cooled panel 24, which differs from example 7 in that: the thickness of the non-liquid cooling region 242 is 4mm 1 ＝0.16m 2 K/W. When one of the unit batteries 1 is thermally out of control, the adjacent unit battery 1 is not affected.
Comparing comparative example 2 with example 8, it can be seen that moderately increasing the thickness of the non-liquid-cooled region 242 is beneficial to reduce the heat transfer between two adjacent cells, while excessively increasing the thickness of the non-liquid-cooled region 242, while the thermal resistance value is still increasing, it is supersaturated and significantly wastes space in the battery pack.
Example 11
This example differs from example 1 in that: the present embodiment provides a split liquid cold plate 25.
Specifically, referring to fig. 10 to 11, the split liquid cooling plate 25 includes a first liquid cooling plate 251 and a second liquid cooling plate 252, and the first liquid cooling plate 251 and the second liquid cooling plate 252 both extend along the length direction of the side surface 11 of the single battery 1 and are respectively attached to the side surfaces 11 of two adjacent single batteries 1. The first liquid cold plate 251 and the second liquid cold plate 252 are two independent plates, which may be bonded, welded or otherwise not connected, and have a cavity 253 formed therebetween. First liquid cold drawing 251 and second liquid cold drawing 252 intussuseption are filled with the coolant liquid, are the air in the cavity 23 to when cell 1 heat production expansion extrusion divides liquid cold drawing 25, cavity 253 is at first by the extrusion, has guaranteed that first liquid cold drawing 251 and second liquid cold drawing 252 are difficult to be squeezed and have become, has avoided producing the resistance to the flow of coolant liquid, thereby has guaranteed the radiating effect.
The cavity 253 is obtained by connecting the first liquid-cooled plate 251 and the second liquid-cooled plate 252 via the buffer portion 254. Specifically, two end portions in the height direction of the first liquid cooling plate 251 are provided with first buffer portions 255, two end portions in the height direction of the second liquid cooling plate 252 are provided with second buffer portions 256, and the two first buffer portions 255 and the two second buffer portions 256 are arranged in one-to-one correspondence. The connection mode of the first buffer part 255 and the second buffer part 256 corresponding to the first buffer part can be butt joint, lap joint, brazing, gluing and the like, and due to the split structure, when only the first liquid cooling plate 251 or the second liquid cooling plate 252 is damaged, only corresponding replacement is needed, and the whole set of split liquid cooling plates 25 do not need to be replaced. In the thickness direction of the split liquid cooling plate 25, at least one buffer portion 254 exceeds the width of a corresponding single liquid cooling plate and extends to the width direction of another liquid cooling plate, and certainly, for the stability of the structure of the split liquid cooling plate 25, in this embodiment, two first buffer portions 255 and two second buffer portions 256 are symmetrical structures and exceed the width of the cold plate 251 and the second liquid cooling plate 252 of the first liquid extending in opposite directions, so that when the two first buffer portions 255 and the two second buffer portions 256 are connected, a distance exists between the first liquid cooling plate 251 and the second liquid cooling plate 252 to form a cavity 253. Optionally, the first buffering portion 254 and the second buffering portion 255 may be a horizontally extending structure, or an inclined oppositely extending structure, or an arc transition oppositely extending structure, etc., an included angle between the first buffering portion 254 and the first liquid cooling plate 251, and an included angle between the remaining second liquid cooling plates of the second buffering portion 255 may be selected within a range of 90-160 °, and a width thereof may be set to 4-10mm, so as to adjust a size of the cavity 253 according to actual requirements and avoid excessive space occupation.
The buffering portion 254 can be selected as an elastic component, air can be filled in the buffering portion 254, a cavity 253 is left between the first liquid cold plate 251 and the second liquid cold plate 252 due to the arrangement of the buffering portion 254, when the split liquid cold plate 25 is expanded and squeezed by the single battery 1, the buffering portion 254 deforms, so that the cavity 253 deforms preferentially over the first liquid cold plate 251 and the second liquid cold plate 252 to absorb the expansion space of the single battery 1, the structural stability of the first liquid cold plate 251 and the second liquid cold plate 252 is ensured, the first liquid cold plate 251 and the second liquid cold plate 252 are prevented from deforming to block the flow of cooling liquid, and the heat dissipation effect is influenced.
Since the bottom parts of the first liquid cooling plate 251 and the second liquid cooling plate 252 are also provided with the buffer parts 254, when the battery pack is loaded, the buffer parts 254 at the bottom parts are adhered to the inner bottom of the battery pack 01 to ensure the stability of the structure of the battery module. In addition, the height of the buffering portion 254 at the top of the first liquid cooling plate 251 and the second liquid cooling plate 252 should not be higher than that of the single battery 1, so as to avoid affecting the assembly of the battery module 02 in the battery pack 01.
The ratio of the total height of the two first buffering parts 255 to the height of the first heat exchange plate 251 and the ratio of the total height of the two second buffering parts 256 to the height of the second heat exchange plate 252 are all 0.08-0.2. If the buffer 254 is too high, the cooling area of the flow passage in the first liquid cooling plate 251 and the second liquid cooling plate 252 is reduced, which affects the heat dissipation effect; if the buffer portion 254 is too low, the buffer area is reduced, i.e., the air layer is reduced, the thermal resistance is reduced, and the buffer area is reduced, which also causes the flow channel to be easily deformed, thereby affecting the flow resistance and the flow rate of the cooling liquid.
The first liquid cold plate 251 and the second liquid cold plate 252 are internally provided with a plurality of reinforcing ribs 26 at intervals vertical to the extending direction thereof, so that a plurality of flow passages are formed in the first liquid cold plate 251 and the second liquid cold plate 252, and the strength of the first liquid cold plate 251 and the second liquid cold plate 252 is improved.
It should be noted that, although the embodiment is a split liquid cooling plate 25, two end portions of the extending direction of the split liquid cooling plate are respectively provided with a current collector 22 to sleeve the same end portions of the first liquid cooling plate 251 and the second liquid cooling plate 252, it should be noted that the cooling liquid inlet and outlet of the current collector 22 is only communicated with the flow passages in the first liquid cooling plate 251 and the second liquid cooling plate 252.
Referring to fig. 9, the blocking portion 223 of the current collector 22 is disposed in the housing 221 and corresponds to the positions of the buffer portion 254 and the cavity 253, the inner cavity 222 is communicated with the flow channel, the liquid change port 224 is not only communicated with the inner cavity 222, but also communicated with the liquid change ports 224 between the adjacent liquid distribution cold plates 25 in sequence, so as to convey the cooling liquid to each liquid distribution cold plate 25 in sequence through the current collector 22.
In this embodiment, a thermal conductive adhesive layer is disposed between the sub-body fluid cooling plate 25 and the side surface 11 of the single battery 1, the thickness of the thermal conductive adhesive layer is 0.2mm, and the thermal conductivity of the thermal conductive adhesive layer is 0.8W/m · K, so the thermal resistance between the sub-body fluid cooling plate 25 and the side surface 11 of the single battery 1 is the thermal resistance of the thermal conductive adhesive layer, and R is the thermal resistance of the thermal conductive adhesive layer 2 ＝2.5*10 -4 m 2 K/W, and the temperature rise rate of the single battery 1 is 0.5 ℃/min during the working process of the battery pack 01 or the battery module 02.
The heat transfer mode between two adjacent single batteries 1 is single battery 1 → heat conducting adhesive layer → liquid cooling panel wall Al3003 → ethylene glycol solution → Al3003 → air in cavity 253 → Al3003 → ethylene glycol solution → Al3003 → heat conducting adhesive layer → single battery 1, wherein the thermal resistances of the two heat conducting adhesive layers are known, and the thermal conductivities of liquid cooling panel wall Al3003, ethylene glycol solution and air in cavity 253 are known, and the thermal conductivities of the two are calculated according to the formula δ/λ. The inner cavity thickness of the liquid separating cold plate 25 is 6.6mm, the wall thickness of the liquid cooling plate is 0.5mm, the inner cavity thickness of the cavity 253 is 1mm, and therefore R 1 ＝0.05m 2 Vs. K/W. When one of the single batteries 1 is thermally out of control, the adjacent single battery 1 is not affected.
Example 12
The present embodiment also provides a liquid cold plate 25 for distributing liquid, and the present embodiment is different from embodiment 11 in that: the thickness of the cavity was 1.2mm, and other conditions were unchanged, so R 1 ＝0.055m 2 Vs. K/W. When one of the unit batteries 1 is thermally out of control, the adjacent unit battery 1 is not affected.
Example 13
The present embodiment also provides a split-flow liquid cooling plate 25, and the present embodiment is different from embodiment 11 in that: the thickness of the cavity was 1.5mm, and other conditions were unchanged, so R 1 ＝0.066m 2 K/W. When one of the single batteries 1 is thermally out of control, the adjacent single battery 1 is not affected.
As in the foregoing analysis, the thickness and the thermal conductivity of the thermal adhesive layer mainly affect the thermal resistance between the single battery 1 and the liquid cooling plate, and the thickness of the filled air mainly affects the thermal resistance between two adjacent single batteries.
Under the condition that the total thickness of the liquid cooling plates is the same, the thermal resistance of the split liquid cooling plate 25 is greater than that of the integrated double-layer liquid cooling plate 24 because contact resistance exists between the first liquid cooling plate 251 and the second liquid cooling plate 252 of the split liquid cooling plate 25. Therefore, under the same conditions, the split liquid cooling plate 25 of the three liquid cooling plates is more favorable for preventing the heat transfer between two adjacent single batteries 1.
Comparative example 3
The present comparative example also provides a split liquid cold plate 25, which differs from example 11 in that: the structure without the cavity 253, the total thickness of the liquid cooling plate is 1.4mm, and other conditions are not changed, so that R 1 ＝0.0014m 2 Vs. K/W. When one of the unit cells 1 is thermally runaway, the adjacent unit cell 1 is also thermally runaway.
Comparing comparative example 3 with example 12, the importance of filling air to prevent heat transfer between two adjacent unit cells 1 is further illustrated.
Example 14
The embodiment also providesLiquid distributing cold plate 25, the present embodiment is different from embodiment 11 in that: the thickness of the heat-conductive adhesive layer was 0.2mm, and the heat conductivity of the heat-conductive adhesive layer was 0.8W/mK, whereby R 2 ＝2.5*10 -4 m 2 K/W, the temperature rise rate of the single cell is 0.5 ℃/min, the thickness of the split liquid cooling plate 25 is 8.6mm, the wall thickness of the split liquid cooling plate 25 is 0.5mm, the thickness of the cavity is 3mm, and R 1 ＝0.12m 2 K/W. When one of the unit batteries 1 is thermally out of control, the adjacent unit battery 1 is not affected.
Example 15
The present embodiment also provides a split-flow liquid cooling plate 25, and the present embodiment is different from embodiment 11 in that: the thickness of the thermal conductive adhesive layer was 0.2mm, and the thermal conductivity of the thermal conductive adhesive layer was 0.8W/m.K, whereby R 2 ＝2.5*10 -4 m 2 K/W, the temperature rise rate of the single battery is 0.5 ℃/min, the thickness of the split liquid cooling plate 25 is 1.5mm, the wall thickness of the split liquid cooling plate 25 is 0.1mm, the thickness of the cavity is 0.05mm, R is 1 ＝1.5*10 -3 m 2 K/W. When one of the single batteries 1 is thermally out of control, the adjacent single battery 1 is not affected.
Example 16
The present embodiment also provides a liquid cold plate 25 for distributing liquid, and the present embodiment is different from embodiment 11 in that: the thickness of the heat-conductive adhesive layer was 6mm, and the heat conductivity of the heat-conductive adhesive layer was 0.2W/mK, whereby R 2 ＝0.03m 2 K/W, the temperature rise rate of the single battery is 3.2 ℃/min, the thickness of the split liquid cooling plate 25 is 6.6mm, the wall thickness of the split liquid cooling plate 25 is 0.5mm, the thickness of the cavity is 1mm, R is 1 ＝0.1m 2 Vs. K/W. When one of the single batteries 1 is thermally out of control, the adjacent single battery 1 is not affected.
Example 17
The present embodiment also provides a liquid cold plate 25 for distributing liquid, and the present embodiment is different from embodiment 11 in that: the thickness of the heat-conductive adhesive layer was 0.04mm, and the heat conductivity of the heat-conductive adhesive layer was 2.5W/mK, from which R 2 ＝1.65*10 -5 m 2 K/W, the temperature rise rate of the single battery is 0.42 ℃/min, and the split liquid cooling plateThe thickness of the liquid separating cold plate 25 is 6.6mm, the wall thickness of the liquid separating cold plate 25 is 0.5mm, the thickness of the cavity is 1mm 1 ＝0.046m 2 K/W. When one of the single batteries 1 is thermally out of control, the adjacent single battery 1 is not affected.
It is worth noting that the flow of each liquid cooling plate in the utility model can be independently adjusted to adapt to actual working requirements.
Performance testing and analysis
1. Test object(s): the battery devices of examples 1-13 and comparative examples 1-3.
2. Test items
1) The thermal resistance value R between two adjacent single batteries 1 is tested by adopting a testing method of the thermal resistance value in the national standard GB/T10294-2008 1 Thermal resistance value R between side surface 11 of single battery 1 and liquid cooling plate 2 。
2) Rate of temperature rise of the unit cell 1:
1) Adjusting the battery pack 01 to SOC 5% at normal temperature;
2) The temperature of the battery reaches the thermal equilibrium at 25 ℃, and the temperature of the battery is measured to be 25 +/-2 ℃ by a temperature detector;
3) Charging to 80% according to the quick-charging MAP window;
4) Introducing cooling liquid at the temperature of Tmax being more than or equal to 32 ℃, and stopping introducing at the temperature of Tmax being less than or equal to 29 ℃;
5) And monitoring the temperature change of the single battery 1 in real time according to the NTC to obtain the temperature rise rate.
Note: the constant temperature of the cooling liquid at the time of entering is 22 ℃, and the constant temperature is 14L/min.
3) The batteries were subjected to a thermal diffusion test according to the root GB 38031-2020.
3. And (3) testing results: see table 1.
Note: in table 1, S represents an example, D represents a comparative example;
a represents the thickness of the thermal adhesive layer, and the unit is mm;
b represents the heat conductivity coefficient of the heat-conducting adhesive layer, and the unit is W/m.K;
with R 1 Represents the thermal resistance between two adjacent single batteries and has the unit of m 2 ﹒K/W；
C represents the temperature rise rate of the single battery, and the unit is ℃/min;
d represents the thickness of the liquid cooling plate, and the unit is mm;
e represents the total thickness of the liquid cooling plate wall, and the unit is mm;
the thickness of the non-liquid channel, the non-liquid cooling area or the cavity is expressed by f, and the unit is mm;
with R 2 Denotes the thermal resistance between the liquid-cooled plate and the side of the cell in m 2 ﹒K/W；
And g represents whether the battery is thermally diffused.
TABLE 1
Comparing comparative example 1 with example 1, it can be seen that the non-liquid channel 232 plays a decisive role in heat transfer between two adjacent single cells 1, in other words, the thickness of the non-liquid channel 232 is reasonably set to reduce the heat transfer between two adjacent single cells 1 better by the through-hole air.
Comparing examples 1 to 4, it can be seen that the heat transfer effect between the adjacent two unit cells 1 can be improved by appropriately adding the non-liquid channel 232.
Comparing embodiment 1 with embodiments 5-6, according to formula R = δ/λ, the thickness and the thermal conductivity of the thermal conductive adhesive layer all influence the thermal resistance value, although the utility model discloses in do not provide the embodiment of thermal conductivity, its principle that influences the thermal resistance value is the same.
In order to make the thermal resistance between the single battery 1 and the liquid cooling plate smaller and maintain a larger thermal resistance between two adjacent single batteries 1, the thermal conductivity of the thermal conductive adhesive layer needs to be increased and/or the thickness of the thermal conductive adhesive layer needs to be reduced, and the reduction of the thickness of the thermal conductive adhesive layer is beneficial to saving space, and at the same time, the non-liquid channel 232 needs to be ensured to have a larger thermal resistance.
Referring to the embodiment 1, the embodiment 7, and the embodiment 11, under the condition that the total thicknesses of the liquid cooling plates are the same, the thermal resistance of the integrated double-layer liquid cooling plate 24 is greater than that of the single-layer liquid cooling plate 23, which shows that the heat transfer effect can be further reduced by the superposition of the cooling liquid and the air, and the thermal resistance of the split liquid cooling plate 25 is greater than that of the integrated double-layer liquid cooling plate 24 because the contact resistance exists between the first liquid cooling plate 251 and the second liquid cooling plate 252 of the split liquid cooling plate 25. It can be seen that, under the same conditions, the split liquid cooling plate 25 is more advantageous to prevent heat transfer between two adjacent single batteries 1 among the three liquid cooling plates.
Referring to example 7 and example 10, the thermal resistance of the integrated dual-layer liquid cold plate 24 depends mainly on the liquid-cooled area 241 and the non-liquid-cooled area 242.
Comparing comparative example 3 with example 12, the importance of filling air to prevent heat transfer between two adjacent unit cells 1 is further illustrated.
The technical means disclosed by the scheme of the present invention is not limited to the technical means disclosed by the above embodiments, but also includes the technical scheme formed by the arbitrary combination of the above technical features. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications are also considered as the protection scope of the present invention.
Claims (25)
1. A battery device, comprising:
the single battery comprises at least two single batteries, wherein the surface with the largest surface area in each single battery is a side surface, the two single batteries are arranged adjacently, and the side surfaces of the two single batteries are arranged oppositely;
the heat exchange component is arranged between two adjacent single batteries and extends along the length direction of the side surface, and two opposite sides of the heat exchange component are respectively connected with the side surfaces of the two adjacent single batteries;
the thermal resistance value between the side surfaces of two adjacent single batteries is R 1 Said monomerThe thermal resistance value between the side surface of the battery and the heat exchange component is R 2 ，R 1 And R 2 Satisfy, 1.5 x 10 -3 m 2 ·K/W≤R 1 ≤0.12m 2 K/W, and 0 < R 2 ≤0.03m 2 ·K/W；
Wherein R is 1 The sum of the ratio of the thickness of each medium to the thermal conductivity coefficient between the side surfaces of two adjacent single batteries, R 2 The sum of the ratio of the thickness of each medium between the side surface of the single battery and the heat exchange component to the heat conductivity coefficient.
2. A battery device according to claim 1, wherein: 1.6*10 -5 m 2 ·K/W≤R 2 ≤0.03m 2 ·K/W。
3. A battery device according to claim 2, wherein: 0.01m 2 ·K/W≤R 1 ≤0.1m 2 ·K/W。
4. A battery device according to claim 3, characterized in that: 4*10 -5 m 2 ·K/W≤R 2 ≤0.013m 2 ·K/W。
5. A battery device according to any one of claims 1 to 4, characterized in that: the height of the heat exchange component is 85% -99% of the height of the single battery.
6. A battery device according to claim 5, wherein: the heat exchange component comprises a heat exchange plate and a current collector, the heat exchange plate extends along the length direction of the side surface, two opposite sides of the heat exchange plate are respectively attached to two adjacent opposite side surfaces of the single batteries, and the current collector is arranged at two end parts of the extending direction of the heat exchange plate.
7. A battery device according to claim 6, wherein: the heat exchange plate comprises a liquid part and a non-liquid part, and the liquid part and the non-liquid part penetrate through the heat exchange plate along the extension direction of the heat exchange plate;
the mass flow body includes shell, inner chamber and shutoff portion, follows heat transfer plate thickness direction, the shell is equipped with the liquid changing mouth that runs through, the inner chamber with shutoff portion all establishes in the shell, just the liquid changing mouth passes through the inner chamber with liquid portion intercommunication, shutoff portion corresponds non-liquid portion sets up.
8. A battery device according to claim 6, characterized in that: the thickness of the heat exchange plate between two opposite sides close to the side face is 4-8mm.
9. A battery device according to claim 6 or 8, characterized in that: a plurality of reinforcing ribs are arranged in the heat exchange plate at intervals along the height direction of the heat exchange plate, and the plurality of reinforcing ribs penetrate through the heat exchange plate along the extending direction of the heat exchange plate, so that a liquid channel and a non-liquid channel are formed inside the heat exchange plate.
10. A battery device according to claim 9, characterized in that: in the height direction, the non-liquid channel is arranged corresponding to 35% -65% of the height of the single battery.
11. A battery device according to claim 10, wherein: the volume of the non-liquid channel is 10% -30% of the volume of the liquid channel.
12. A battery device according to claim 9, characterized in that: the non-liquid channel is filled with at least one of air, a heat insulation piece and a phase-change material, and the liquid channel is filled with a heat exchange liquid.
13. A battery device according to claim 6 or 8, characterized in that: the heat exchange plate comprises two liquid areas of an integrated structure, the two liquid areas are respectively attached to opposite side surfaces of two adjacent single batteries, and a non-liquid area is arranged between the two liquid areas.
14. A battery device according to claim 13, wherein: the heat exchange plate further comprises a buffer area, the buffer area is respectively adjacent to the liquid area and the non-liquid area, two sides of the buffer area are respectively attached to opposite side faces of the two adjacent single batteries, and at least one of air, a heat insulation piece and a phase change material is filled in the buffer area.
15. A battery device according to claim 14, wherein: buffer area and two all be equipped with many strengthening ribs along its direction of height interval in the liquid district, many the strengthening rib is all followed the extending direction of heat transfer board runs through the heat transfer board.
16. A battery device according to claim 13, wherein: the non-liquid area is filled with at least one of air, a heat insulation piece and a phase-change material, and the liquid area is filled with a heat exchange liquid.
17. A battery device according to claim 6 or 8, characterized in that: the heat exchange plates comprise a first heat exchange plate and a second heat exchange plate which are arranged adjacently, and the first heat exchange plate and the second heat exchange plate are respectively attached to the opposite side surfaces of two adjacent single batteries.
18. A battery device according to claim 17, wherein: and a cavity is arranged between the first heat exchange plate and the second heat exchange plate.
19. A battery device according to claim 18, wherein: the first heat exchange plate and the second heat exchange plate are connected through a buffer part to form the cavity.
20. A battery device according to claim 19, wherein: the buffer parts comprise first buffer parts arranged at two end parts of the first heat exchange plate in the height direction and second buffer parts arranged at two end parts of the second heat exchange plate in the height direction, and the first buffer parts and the second buffer parts corresponding to the first buffer parts extend oppositely to enable the first heat exchange plate and the second heat exchange plate to form the cavity.
21. A battery device according to claim 20, wherein: the total heights of the first heat exchange plate and the first buffer parts at two ends of the first heat exchange plate and the total heights of the second heat exchange plate and the second buffer parts at two ends of the second heat exchange plate are not higher than the height of the single battery.
22. A battery device according to claim 21, wherein: the height ratio of the total height of the two first buffer parts to the first heat exchange plate and the height ratio of the total height of the two second buffer parts to the second heat exchange plate are both 0.08-0.2.
23. A battery device according to claim 17, wherein: and a plurality of reinforcing ribs are arranged in the first heat exchange plate and the second heat exchange plate at intervals along the height direction of the first heat exchange plate and the second heat exchange plate.
24. A battery device according to claim 19, wherein: the buffer part is an elastic buffer part.
25. A battery device according to claim 19, wherein: at least one of air, a heat insulation piece and a phase change material is filled in the cavity and/or the buffer part, and a heat exchange liquid is filled in the first heat exchange plate and the second heat exchange plate.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222623306.5U CN218385428U (en) | 2022-09-30 | 2022-09-30 | Battery device |
| DE202023102857.8U DE202023102857U1 (en) | 2022-09-30 | 2023-05-24 | battery device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222623306.5U CN218385428U (en) | 2022-09-30 | 2022-09-30 | Battery device |
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| CN218385428U true CN218385428U (en) | 2023-01-24 |
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| CN202222623306.5U Active CN218385428U (en) | 2022-09-30 | 2022-09-30 | Battery device |
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| Country | Link |
|---|---|
| CN (1) | CN218385428U (en) |
| DE (1) | DE202023102857U1 (en) |
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- 2022-09-30 CN CN202222623306.5U patent/CN218385428U/en active Active
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| DE202023102857U1 (en) | 2023-06-19 |
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