CN115377548A - Cooling device and battery pack - Google Patents
Cooling device and battery pack Download PDFInfo
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- CN115377548A CN115377548A CN202211129948.8A CN202211129948A CN115377548A CN 115377548 A CN115377548 A CN 115377548A CN 202211129948 A CN202211129948 A CN 202211129948A CN 115377548 A CN115377548 A CN 115377548A
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- cooling unit
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- water inlet
- water outlet
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- 238000001816 cooling Methods 0.000 title claims abstract description 448
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 223
- 239000002826 coolant Substances 0.000 claims description 50
- 238000005219 brazing Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 6
- 239000012530 fluid Substances 0.000 description 6
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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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
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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
- H01M10/617—Types of temperature control for achieving uniformity or desired distribution of temperature
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
- H01M10/625—Vehicles
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/655—Solid structures for heat exchange or heat conduction
- H01M10/6554—Rods or plates
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/655—Solid structures for heat exchange or heat conduction
- H01M10/6556—Solid parts with flow channel passages or pipes for heat exchange
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
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- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
Abstract
The utility model provides a cooling device and battery package, relates to power battery technical field, including water inlet, delivery port and set up a plurality of first cooling unit between water inlet and delivery port side by side, first cooling unit is used for the temperature of the relative both sides of balanced battery module, and every first cooling unit includes two first runners that set up side by side, the both ends of every first runner respectively with water inlet and delivery port intercommunication, the length and the width homogeneous phase of two first runners of arbitrary first cooling unit are equal. This cooling device can reduce the difference in temperature between the different battery modules through reducing the temperature rise and the pressure drop difference between the different cooling unit.
Description
Technical Field
The invention relates to the technical field of power batteries, in particular to a cooling device and a battery pack.
Background
With the rapid development of social economy and the continuous improvement of living standard of people, new energy automobiles gradually move to thousands of households, the new energy automobile industry begins to develop rapidly, and various automobile types emerge endlessly to meet the use requirements of different consumers. Among them, the battery pack is the most important component in the new energy automobile.
In the prior art, the battery pack generally comprises a plurality of battery modules, and a cooling system of the battery pack is mostly in a series structure and needs to be responsible for cooling all the battery modules. Specifically, water inlet and delivery port are located the relative both sides of battery package respectively, and water inlet and delivery port realize the intercommunication through the end to end connection in proper order of a plurality of harmonica pipes that set up side by side.
This cooling system has the following disadvantages: there is obvious temperature difference between the coolant who is close to the water inlet and the coolant who is close to the delivery port to there is obvious difference in temperature between the different battery modules in causing the battery package, and then leads to the depth of discharge inconsistent of different battery modules, finally causes the battery module life-span to attenuate sharply.
Disclosure of Invention
The invention aims to provide a cooling device and a battery pack, which can reduce the temperature difference between different battery modules by reducing the temperature rise and pressure drop difference between different cooling units, thereby improving the consistency of the discharge depths of the different battery modules and further prolonging the service life of the battery modules.
The embodiment of the invention is realized by the following steps:
in one aspect of the embodiment of the invention, a cooling device is provided, and the cooling device includes a water inlet, a water outlet, and a plurality of first cooling units arranged between the water inlet and the water outlet in parallel, where the first cooling units are used to equalize temperatures of two opposite sides of a battery module, each first cooling unit includes two first branch flow channels arranged in parallel, two ends of each first branch flow channel are respectively communicated with the water inlet and the water outlet, and the lengths and widths of the two first branch flow channels of any one first cooling unit are equal. This cooling device can reduce the difference in temperature between the different battery modules through reducing the temperature rise and the pressure drop difference between the different cooling unit to improve the degree of discharge's of different battery modules uniformity, and then improve battery module's life.
Optionally, the lengths and widths of the first branch channels of the plurality of first cooling units are equal, and the water inlet and the water outlet are oppositely arranged along the diagonal line of the rectangle formed by the plurality of first cooling units.
Optionally, when the number of the first cooling units is three or more, the water inlet and the water outlet are oppositely arranged along a central line of a rectangle formed by the plurality of first cooling units, the lengths of the first branch flow channels of the plurality of first cooling units are equal, and the widths of the first branch flow channels of the plurality of first cooling units are gradually increased along a direction from the central line to the outer edge of the rectangle formed by the plurality of first cooling units.
Optionally, each first cooling unit includes leading-in runner, the one end of leading-in runner with the water inlet intercommunication, the other end of leading-in runner respectively with two first branch runner intercommunication, two first branch runner with the one end orientation that the leading-in runner communicates extends towards the one side of keeping away from each other, so that two first branch runner with the one end of delivery port intercommunication sets up adjacently.
Optionally, still include with first cooling unit is the second cooling unit that sets up side by side, the second cooling unit is used for the equilibrium the temperature of the relative both sides of battery module, the second cooling unit includes that the second is a runner, the water inlet the second is a runner with the delivery port communicates in proper order, the length of every first runner of first cooling unit the length of the second of second cooling unit is a runner and the length sum of two first runners of first cooling unit increases in proper order.
Optionally, the second cooling unit is located on one side of the plurality of first cooling units forming a rectangle, a width of a first branch flow channel of the first cooling unit close to the second cooling unit is equal to a width of a second branch flow channel of the second cooling unit, the width of the first branch flow channel of the plurality of first cooling units is gradually increased along a direction from close to the second cooling unit to far away from the second cooling unit, and the width of the first branch flow channel of the first cooling unit far away from the second cooling unit is less than or equal to 30mm.
Optionally, the water inlet is located at a midpoint of a connection line between one end of the second cooling unit, which is close to the first cooling unit and is communicated with the water inlet, and one end of the second cooling unit, which is communicated with the water inlet, and the water outlet is located at one side of the second cooling unit, which is far away from the first cooling unit.
Optionally, the water inlet is located at a midpoint of a connection line between one end of the first cooling unit far away from the second cooling unit and communicated with the water inlet and one end of the second cooling unit and communicated with the water inlet, and the water outlet is located at one side of the second cooling unit far away from the first cooling unit.
Optionally, a throttling portion is arranged between the water inlet and one end of the second cooling unit communicated with the water inlet, and the throttling portion is used for adjusting the flow rate of a cooling medium introduced through the water inlet to the first cooling unit and the second cooling unit between the throttling portion and the second cooling unit.
Optionally, a first confluence portion is arranged between the water inlet and one end, which is far away from the water inlet, of the first branch flow channel of the first cooling unit and communicated with the water inlet, and the first confluence portion is used for guiding the movement of a cooling medium introduced through the water inlet to the first branch flow channel; and/or a second confluence part is arranged between the water inlet and one end, communicated with the water inlet, of a second branch flow channel of the second cooling unit, and the second confluence part is used for guiding the movement of a cooling medium introduced through the water inlet to flow to the second branch flow channel.
Optionally, a first guide portion is arranged at one end of the first branch flow channel of the first cooling unit, which is communicated with the water outlet, and the first guide portion is used for guiding the movement of the cooling medium in the first branch flow channel to the water outlet; and/or a second guide part is arranged at one end of a second branch flow channel of the second cooling unit, which is communicated with the water outlet, and the second guide part is used for guiding the movement of the cooling medium in the second branch flow channel, which flows to the water outlet.
Optionally, a first included angle is formed between the extending direction of the first guide part and the extending direction of one end, communicated with the water outlet, of the first branch flow channel of the first cooling unit, and the value range of the first included angle is 120-150 degrees; and/or a second included angle is formed between the extending direction of the second guide part and the extending direction of one end of the second branch flow channel of the second cooling unit, which is communicated with the water outlet, and the value range of the second included angle is 120-150 degrees.
Optionally, a third confluence portion is arranged between the water outlet and one end, which is far away from the water outlet, of the first branch flow channel of the first cooling unit and is communicated with the water outlet, and the third confluence portion is used for guiding the movement of the cooling medium in the first branch flow channel to the water outlet; and/or a fourth confluence part is arranged between the water outlet and one end of the second branch flow channel of the second cooling unit communicated with the water outlet, and the fourth confluence part is used for guiding the cooling medium in the second branch flow channel to move towards the water outlet.
Optionally, the cooling device includes a first plate body and a second plate body arranged opposite to the first plate body, the first plate body and the second plate body are provided with the first branch flow channel, or, when the cooling device further includes a second cooling unit, the first plate body and the second plate body are provided with the first branch flow channel and the second branch flow channel of the second cooling unit, and the first plate body and the second plate body are welded by brazing, so that the first plate body and the second plate body are matched to form a cooling flow channel for flowing through a cooling medium introduced from the water inlet to the water outlet.
Optionally, the height of the cooling channel is greater than 5mm along a connecting line direction of the first plate body and the second plate body.
Optionally, the width of the braze weld is greater than or equal to 8mm.
In another aspect of the embodiments of the present invention, a battery pack is provided, which includes the cooling device described above and at least one battery module disposed above the cooling device, where each battery module is disposed corresponding to a first cooling unit of the cooling device, or, when the cooling device further includes a second cooling unit, each battery module is disposed corresponding to the first cooling unit or the second cooling unit of the cooling device. This cooling device can reduce the difference in temperature between the different battery modules through reducing the temperature rise and the pressure drop difference between the different cooling unit to improve the degree of discharge's of different battery modules uniformity, and then improve battery module's life.
The embodiment of the invention has the beneficial effects that:
the cooling device comprises a water inlet, a water outlet and a plurality of first cooling units arranged between the water inlet and the water outlet in parallel, wherein the first cooling units are used for balancing the temperature of two opposite sides of the battery module, each first cooling unit comprises two first branch flow channels arranged in parallel, two ends of each first branch flow channel are respectively communicated with the water inlet and the water outlet, and the length and the width of each first branch flow channel of any first cooling unit are equal. This cooling device is through adopting a plurality of first cooling unit parallelly connected and two parallelly connected modes of first runners of constituteing first cooling unit, and the length and the width homogeneous phase of still two first runners through arbitrary first cooling unit are equal, reduce temperature rise and pressure drop difference between the different cooling units, can reduce the difference in temperature between the different battery modules to improve the depth of discharge's of different battery modules uniformity, and then improve battery module's life.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural view of a cooling device according to a first embodiment of the present invention;
fig. 2 is a schematic structural view of a cooling device according to a second embodiment of the present invention;
fig. 3 is a schematic structural view of a cooling apparatus according to a third embodiment of the present invention;
fig. 4 is a schematic structural view of a cooling device according to a fourth embodiment of the present invention;
FIG. 5 is an enlarged view of a portion of the first cooling unit of FIG. 4;
fig. 6 is a partially enlarged view of the second cooling unit of fig. 4.
Icon: 100-a cooling device; 10-a water inlet; 11-a throttle; 12-a second bus; 13-a first junction; 20-water outlet; 21-a fourth bus; 22-a third confluence; 30-a second cooling unit; 31-a second branch flow channel; 311-a second guide; 40-a first cooling unit; 41-a first branch flow channel; 411-a first guide; 42-a lead-in channel; 50-a first plate body; d 1 -a width of the second tributary channel; d 2 -a width of the first branch flow channel; d-width of braze weld; alpha-second angle; beta-first angle.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements 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. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be internal to both elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
Referring to fig. 1 to 6, an embodiment of the present application provides a cooling device 100, which includes a water inlet 10, a water outlet 20, and a plurality of first cooling units 40 arranged between the water inlet 10 and the water outlet 20 in parallel, where the first cooling units 40 are configured to equalize temperatures of two opposite sides of a battery module, each first cooling unit 40 includes two first branch flow channels 41 arranged in parallel, two ends of each first branch flow channel 41 are respectively communicated with the water inlet 10 and the water outlet 20, and lengths and widths of the two first branch flow channels 41 of any first cooling unit 40 are equal.
It should be noted that the cooling device 100 includes a water inlet 10, a water outlet 20 and a plurality of first cooling units 40, wherein the first cooling units 40 are used for equalizing the temperatures of two opposite sides of the battery module, and the plurality of first cooling units 40 are disposed between the water inlet 10 and the water outlet 20 in parallel, in other words, the plurality of first cooling units 40 are connected in parallel, so that the cooling medium introduced through the water inlet 10 can be divided into each first cooling unit 40 instead of sequentially flowing through the plurality of first cooling units 40, and thus the cooling device 100 can reduce the temperature rise difference between the cooling media flowing through different cooling units (i.e., the plurality of first cooling units 40), thereby reducing the temperature difference between the battery modules corresponding to the plurality of first cooling units 40. Regarding the actual number of the first cooling units 40, those skilled in the art should be able to make reasonable selection and design according to the actual situation, and no specific limitation is made herein.
Pressure drop is caused by the pressure difference between the front and back of the fluid flow due to the internal friction of the fluid flow and the mutual collision and momentum exchange between the fluid particles when the turbulence is overcome. The size of pressure drop is relevant with the change of intraductal flow, velocity of flow, and the change of intraductal flow, velocity of flow also can cause the influence to the heat exchange effect between cooling medium and the battery module, and the intraductal flow should not be the undersize, and the undersize is not relatively poor with the heat exchange effect between the battery module, and intraductal flow velocity should not be too fast, and the heat exchange effect between too fast and the battery module is relatively poor. Therefore, in the cooling device 100 provided by the present application, the lengths and widths of the two first branch flow channels 41 of any one of the first cooling units 40 are equal, so as to reduce the pressure drop difference between the cooling mediums flowing through the two first branch flow channels 41 of any one of the first cooling units 40, so as to reduce the temperature difference between the two opposite sides of the battery module corresponding to any one of the first cooling units 40, and further reduce the temperature difference between the battery modules corresponding to the plurality of first cooling units 40.
As shown in fig. 1, in the first embodiment, the lengths and widths of the first branch flow paths 41 of the plurality of first cooling units 40 are equal, and the water inlets 10 and the water outlets 20 are disposed opposite to each other along a diagonal line of a rectangle formed by the plurality of first cooling units 40. As shown in fig. 2, in the second embodiment, when the first cooling units 40 include three or more, the water inlets 10 and the water outlets 20 are oppositely disposed along the central line of the rectangle formed by the plurality of first cooling units 40, the lengths of the first branch flow channels 41 of the plurality of first cooling units 40 are equal, and the widths of the first branch flow channels 41 of the plurality of first cooling units 40 are gradually increased along the direction from the central line to the outer edge of the rectangle formed by the plurality of first cooling units 40.
Here, as explained by taking fig. 1 as an example, when the cooling medium introduced through the water inlet 10 is branched into the plurality of first cooling units 40, since the water inlet 10 and the water outlet 20 are oppositely disposed along a diagonal line of a rectangle formed by the plurality of first cooling units 40, it can be considered that the initial pressure flowing into the first cooling unit 40 near the water inlet 10 is the largest and the initial pressure flowing into the first cooling unit 40 far from the water inlet 10 is the smallest; when the cooling medium in the first cooling unit 40 is about to flow out of the first cooling unit 40, because the lengths and widths of the first branch flow channels 41 of the plurality of first cooling units 40 are equal, the intermediate pressure flowing out of the first cooling unit 40 close to the water inlet 10 is still the largest, and the intermediate pressure flowing out of the first cooling unit 40 far from the water inlet 10 is still the smallest, so that the first pressure drop of the first cooling unit 40 close to the water inlet 10 (i.e. the difference between the initial pressure flowing into the first cooling unit 40 and the intermediate pressure flowing out of the first cooling unit 40) is equivalent to the first pressure drop of the first cooling unit 40 far from the water inlet 10 (i.e. the difference between the initial pressure flowing into the first cooling unit 40 and the intermediate pressure flowing out of the first cooling unit 40); when the cooling medium flowing out of the first cooling unit 40 is about to flow into the water outlet 20, since the water outlet 20 is located at a side close to the first cooling unit 40 far from the water inlet 10, the second pressure drop of the first cooling unit 40 close to the water inlet 10 (i.e. the difference between the intermediate pressure flowing out of the first cooling unit 40 and the final pressure of the water inlet 20) is equivalent to the second pressure drop of the first cooling unit 40 far from the water inlet 10 (i.e. the difference between the intermediate pressure flowing out of the first cooling unit 40 and the final pressure of the water inlet 20), and the difference in pressure drop between the cooling medium flowing through the two first cooling units 40 is reduced, thereby further reducing the temperature difference between the battery modules corresponding to the first cooling units 40. Similarly, the total pressure drop of the other two first cooling units 40 located between the first cooling unit 40 close to the water inlet 10 and the first cooling unit 40 far from the water inlet 10 is also equivalent, and therefore, the difference in pressure drop between the cooling mediums flowing through the plurality of first cooling units 40 can be reduced, thereby further reducing the temperature difference between the battery modules corresponding to the plurality of first cooling units 40.
As shown in fig. 1 to 4, in the four embodiments, each first cooling unit 40 includes an introduction flow channel 42, one end of the introduction flow channel 42 communicates with the water inlet 10, and the other end of the introduction flow channel 42 communicates with two first branch flow channels 41, respectively, so that when the cooling medium introduced through the introduction flow channel 42 is divided into two first branch flow channels 41 of the first cooling unit 40, since the introduction flow channel 42 is located at a midpoint of a connection line of the two first branch flow channels 41 of the first cooling unit 40, it can be considered that initial pressures flowing into the two first branch flow channels 41 of the first cooling unit 40 are equal, and ends of the two first branch flow channels 41 communicating with the introduction flow channel 42 extend toward sides far away from each other, so that ends of the two first branch flow channels 41 communicating with the water outlet 20 are adjacently disposed, so that an interval between the ends of the two first branch flow channels 41 communicating with the water outlet 20 and the water outlet 20 is close, thereby reducing a difference in pressure drop between the two first branch flow channels 41 of the first cooling unit 40, and further reducing a temperature difference between opposite sides of the battery modules corresponding to the second cooling unit 30.
As shown in fig. 3 and 4, in the third and fourth embodiments, the cooling device 100 further includes a second cooling unit 30 juxtaposed to the first cooling unit 40, the second cooling unit 30 is used for equalizing the temperatures of two opposite sides of the battery module, the second cooling unit 30 includes a second branch flow channel 31, the water inlet 10, the second branch flow channel 31 and the water outlet 20 are sequentially communicated, and the sum of the length of each first branch flow channel 41 of the first cooling unit 40, the length of the second branch flow channel 31 of the second cooling unit 30 and the lengths of the two first branch flow channels 41 of the first cooling unit 40 is sequentially increased.
It should be noted that the cooling device 100 further includes a second cooling unit 30, wherein the second cooling unit 30 is used for equalizing the temperatures of the two opposite sides of the battery module, and the first cooling unit 40 and the second cooling unit 30 are arranged in parallel between the water inlet 10 and the water outlet 20, in other words, the first cooling unit 40 and the second cooling unit 30 are connected in parallel, so that the cooling medium introduced through the water inlet 10 can be divided into the first cooling unit 40 and the second cooling unit 30, rather than sequentially flowing through the first cooling unit 40 and the second cooling unit 30 or sequentially flowing through the second cooling unit 30 and the first cooling unit 40, and thus the cooling device 100 can reduce the temperature rise difference between the cooling mediums flowing through different cooling units (i.e., the first cooling unit 40 and the second cooling unit 30), thereby reducing the temperature difference between the battery module corresponding to the first cooling unit 40 and the battery module corresponding to the second cooling unit 30.
On the basis, the cooling device 100 provided by the present application further reduces the difference in pressure drop between the cooling media flowing through different cooling units (i.e., the first cooling unit 40 and the second cooling unit 30) through the difference in connection form and flow channel length between the first cooling unit 40 and the second cooling unit 30, thereby further reducing the temperature difference between the battery modules corresponding to the first cooling unit 40 and the battery modules corresponding to the second cooling unit 30. Specifically, on one hand, as shown in fig. 1 to 4, each first cooling unit 40 includes two first branch flow channels 41 arranged in parallel, and two ends of each first branch flow channel 41 are respectively communicated with the water inlet 10 and the water outlet 20, in other words, a parallel connection mode is designed between the two first branch flow channels 41 constituting the first cooling unit 40, so that the cooling medium introduced through the water inlet 10 can be divided into the two first branch flow channels 41 and finally flows out through the water outlet 20 when flowing into the first cooling unit 40, as shown in fig. 3 and 4, the second cooling unit 30 includes a second branch flow channel 31, and the water inlet 10, the second branch flow channel 31 and the water outlet 20 are sequentially communicated, in other words, a series connection mode is designed between a plurality of pipelines constituting the second branch flow channel 31 in an end-to-end sequential connection mode, so that the cooling medium introduced through the water inlet 10 can only gradually flow from one side of the second branch flow channel 31 close to the water inlet 10 to one side of the second branch flow channel 31 close to the water outlet 20 and finally flows out through the water outlet 20 when flowing into the second cooling unit 30, and the second cooling unit 30 is different in a connection mode of the first cooling unit 40 and the second cooling unit 40; on the other hand, the sum of the length of each of the first branch flow passages 41 of the first cooling unit 40, the length of the second branch flow passage 31 of the second cooling unit 30, and the lengths of the two first branch flow passages 41 of the first cooling unit 40 increases in this order, which is the difference in the flow passage lengths of the second cooling unit 30 and the first cooling unit 40.
In summary, the cooling device 100 can reduce the temperature difference between different battery modules by reducing the temperature rise and the pressure drop difference between different cooling units, so as to improve the consistency of the depth of discharge of different battery modules, and further improve the service life of the battery modules.
As shown in fig. 3 and 4, in the third and fourth embodiments, the second cooling unit 30 is located at one side of the plurality of first cooling units 40 forming a rectangle, and the width d of the first branch flow path of the first cooling unit 40 adjacent to the second cooling unit 30 2 Equal to the width d of the second branch flow passage of the second cooling unit 30 1 The width d of the first branched flow path of the plurality of first cooling units 40 is along the direction from the second cooling unit 30 to the second cooling unit 30 2 Gradually increases the width d of the first branch flow passage of the first cooling unit 40 away from the second cooling unit 30 2 Less than or equal to 30mm.
To be explainedThat is, since the initial pressure of the cooling medium flowing into the water inlet 10 is large and the final pressure of the cooling medium flowing out of the water outlet 20 is small, when the first cooling unit 40 includes a plurality of cooling units, the kinetic energy required for the cooling medium in the first cooling unit 40, which is farther from the water outlet 20, to flow is larger. For this reason, as shown in fig. 3 and 4, in the third and fourth embodiments, when the first cooling unit 40 includes a plurality of ones, the width d of the first branched flow path of the plurality of first cooling units 40 is in the direction from the second cooling unit 30 to the second cooling unit 30 (or in the direction from the water outlet 20 to the water outlet 20), and the width d of the first branched flow path of the plurality of first cooling units 40 is in the direction from the second cooling unit 30 to the second cooling unit 30 (or in the direction from the water outlet 20 to the water outlet 20) 2 And gradually increases. Optionally, the width d of the second branch flow passage of the second cooling unit 30 1 Equal to the width d of the first branch flow channel of the first cooling unit 40 near the water outlet 20 2 . Optionally, the width d of the first branch flow channel of the first cooling unit 40 away from the water outlet 20 2 Less than or equal to 30mm.
As shown in fig. 3, in the third embodiment, the water inlet 10 is located at a midpoint of a connecting line between an end of the first cooling unit 40 near the second cooling unit 30, which communicates with the water inlet 10, and an end of the second cooling unit 30, which communicates with the water inlet 10, and the water outlet 20 is located at a side of the second cooling unit 30, which is far from the first cooling unit 40. As shown in fig. 4, in the fourth embodiment, the water inlet 10 is located at the midpoint of a connecting line between the end of the first cooling unit 40 far from the second cooling unit 30, which communicates with the water inlet 10, and the end of the second cooling unit 30, which communicates with the water inlet 10, and the water outlet 20 is located at the side of the second cooling unit 30 far from the first cooling unit 40. Illustratively, as shown in fig. 4, in the fourth embodiment, the number of the first cooling units 40 is three, and the water inlet 10 is located at the center of a line connecting the second cooling unit 30 and the three first cooling units 40, so as to equalize the flow rate of the cooling medium introduced through the water inlet 10 to the respective cooling units (i.e., the three first cooling units 40 and the second cooling unit 30).
Here, as explained by taking fig. 4 as an example, when the cooling medium introduced through the water inlet 10 is branched into the first cooling unit 40 and the second cooling unit 30, since the water inlet 10 is located at a midpoint of a line connecting an end of the first cooling unit 40 far from the second cooling unit 30, which communicates with the water inlet 10, and an end of the second cooling unit 30, which communicates with the water inlet 10, it can be considered that the initial pressure flowing into the first cooling unit 40 far from the second cooling unit 30 and the initial pressure flowing into the second cooling unit 30 are equal; when the cooling medium in the first branch flow channel 41 of the first cooling unit 40 is about to flow out of the first cooling unit 40, the cooling medium in the second branch flow channel 31 of the second cooling unit 30 is about to flow out of the second cooling unit 30, because the length of each first branch flow channel 41 of the first cooling unit 40, the length of the second branch flow channel 31 of the second cooling unit 30, and the sum of the lengths of the two first branch flow channels 41 of the first cooling unit 40 are sequentially increased, the intermediate pressure flowing out of the second cooling unit 30 is smaller than the intermediate pressure flowing out of the first cooling unit 40, so that the first pressure drop of the second cooling unit 30 (i.e., the difference between the initial pressure flowing into the second cooling unit 30 and the intermediate pressure flowing out of the second cooling unit 30) is greater than the first pressure drop of the first cooling unit 40 (i.e., the difference between the initial pressure flowing into the first cooling unit 40 and the intermediate pressure flowing out of the first cooling unit 40); when the cooling medium flowing out of the first cooling unit 40 is about to flow into the water outlet 20 and the cooling medium flowing out of the second cooling unit 30 is about to flow into the water outlet 20, since the water outlet 20 is located at a side close to the second cooling unit 30, the second pressure drop of the second cooling unit 30 (i.e., the difference between the intermediate pressure flowing out of the second cooling unit 30 and the final pressure flowing into the water outlet 20) is smaller than the second pressure drop of the first cooling unit 40 (i.e., the difference between the intermediate pressure flowing out of the first cooling unit 40 and the final pressure flowing into the water outlet 20), so that the total pressure drop of the second cooling unit 30 (i.e., the sum of the first pressure drop of the second cooling unit 30 and the second pressure drop of the second cooling unit 30) is close to the total pressure drop of the first cooling unit 40 (i.e., the sum of the first pressure drop of the first cooling unit 40 and the second pressure drop of the first cooling unit 40), and the difference between the cooling mediums flowing through the first cooling unit 40 and the second cooling unit 30 is further reduced, thereby further reducing the temperature difference between the battery modules corresponding to the first cooling unit 40 and the second cooling unit 30. Similarly, the total pressure drop of the other two first cooling units 40 located between the first cooling unit 40 and the second cooling unit 30 which are far from the second cooling unit 30 is also close to the total pressure drop of the second cooling unit 30, and therefore, the difference in pressure drop between the cooling media flowing through the plurality of first cooling units 40 and the plurality of second cooling units 30 can be reduced, thereby further reducing the temperature difference between the battery modules corresponding to the first cooling units 40 and the battery modules corresponding to the second cooling units 30.
In addition to the location of the water inlet 10, the cooling device 100 provided by the present application also flexibly adjusts the flow rate of the cooling medium introduced through the water inlet 10 to the respective cooling units (i.e., the first cooling unit 40 and the second cooling unit 30) by adding the throttling portion 11. Specifically, as shown in fig. 4, in the fourth embodiment, a throttling part 11 is provided between the water inlet 10 and one end of the second branch flow passage 31 of the second cooling unit 30, which communicates with the water inlet 10, and the throttling part 11 is used for regulating the flow rate of the cooling medium introduced through the water inlet 10 to the first cooling unit 40 and the second cooling unit 30 located between the throttling part 11 and the second cooling unit 30. Illustratively, as shown in fig. 4, in the fourth embodiment, the inner diameter of the pipeline at the position of the throttling part 11 is smaller to further equalize the flow rates of the cooling medium introduced through the water inlet 10 to the respective cooling units (i.e., the first cooling unit 40 and the second cooling unit 30).
As shown in fig. 3 and 4, in the third and fourth embodiments, a first confluence part 13 is provided between the water inlet 10 and one end of the first branch flow channel 41 of the first cooling unit 40 away from the water outlet 20, which is communicated with the water inlet 10 (i.e., the water inlet end of the first branch flow channel 41 away from the water outlet 20), and the first confluence part 13 is used for guiding the movement of the cooling medium introduced through the water inlet 10 to the first branch flow channel 41; and/or a second confluence part 12 is arranged between the water inlet 10 and one end of the second branch flow channel 31 of the second cooling unit 30, which is communicated with the water inlet 10 (i.e., a water inlet end of the second branch flow channel 31), and the second confluence part 12 is used for guiding the movement of the cooling medium introduced through the water inlet 10 to flow to the second branch flow channel 31. By the first confluence part 13 and the second confluence part 12, kinetic energy loss of the fluid can be reduced, thereby facilitating the cooling medium introduced through the water inlet 10 to flow into the water inlet ends of the respective cooling units (i.e., the first cooling unit 40 and the second cooling unit 30).
As shown in fig. 3 to 5, in the third and fourth embodiments, one end of the first branch flow channel 41 of the first cooling unit 40, which is communicated with the water outlet 20 (i.e., the water outlet end of the first branch flow channel 41), is provided with a first guide part 411, and the first guide part 411 is used for guiding the movement of the cooling medium in the first branch flow channel 41 to flow to the water outlet 20; and/or, as shown in fig. 3, 4 and 6, in the third embodiment and the fourth embodiment, one end of the second branch flow channel 31 of the second cooling unit 30, which is communicated with the water outlet 20 (i.e. the water outlet end of the second branch flow channel 31), is provided with a second guide part 311, and the second guide part 311 is used for guiding the movement of the cooling medium in the second branch flow channel 31 to the water outlet 20. The kinetic energy loss of the fluid is reduced by the first guide portion 411 and the second guide portion 311, so that the cooling medium in each cooling unit (i.e., the first cooling unit 40 and the second cooling unit 30) can flow to the water outlet 20 through the water outlet end of each cooling unit (i.e., the first cooling unit 40 and the second cooling unit 30).
Optionally, a first included angle β is formed between the extending direction of the first guide portion 411 and the extending direction of the end of the first branched flow channel 41 of the first cooling unit 40, which is communicated with the water outlet 20, and the range of the first included angle β is between 120 ° and 150 °; and/or a second included angle α is formed between the extending direction of the second guide part 311 and the extending direction of the end of the second branch flow channel 31 of the second cooling unit 30, which is communicated with the water outlet 20, and the value range of the second included angle α is between 120 ° and 150 °.
Regarding the actual values of the first included angle β and the second included angle α, those skilled in the art should be able to make reasonable selection and design according to the actual situation, and no specific limitation is made herein. Illustratively, in the fourth embodiment, the angles of the first included angle β and the second included angle α are equal, for example, the angles of the first included angle β and the second included angle α are both 135 °, although in other embodiments, the angles of the first included angle β and the second included angle α may also be different, for example, the angle of the first included angle β is 135 ° and the angle of the second included angle α is 120 °. Further, it should be noted that when the first cooling unit 40 includes a plurality of first guide portions 411, the first guide portions 411 also include a plurality of first guide portions 411, and the angles of the first included angles β of the plurality of first guide portions 411 may be equal, for example, the angles of the first included angles β of the plurality of first guide portions 411 are all 135 °, and the angles of the first included angles β of the plurality of first guide portions 411 may also be different, for example, the angles of the first included angles β of the first guide portions 411 increase in sequence from the direction close to the water outlet 20 to the direction away from the water outlet 20.
As shown in fig. 3 to 5, in the third and fourth embodiments, a third confluence portion 22 is provided between the water outlet 20 and one end of the first branch flow channel 41 of the first cooling unit 40 away from the water outlet 20, the end communicating with the water outlet 20, and the third confluence portion 22 is used for guiding the movement of the cooling medium in the first branch flow channel 41 to the water outlet 20; and/or, as shown in fig. 3, 4 and 6, in the third embodiment and the fourth embodiment, a fourth confluence part 21 is arranged between the water outlet 20 and one end of the second branch flow channel 31 of the second cooling unit 30, which is communicated with the water outlet 20, and the fourth confluence part 21 is used for guiding the movement of the cooling medium in the second branch flow channel 31 to the water outlet 20. By the third confluence portion 22 and the fourth confluence portion 21, a kinetic energy loss of the fluid may be reduced, thereby facilitating the flow of the cooling medium flowing out through the respective cooling units (i.e., the first cooling unit 40 and the second cooling unit 30) toward the water outlet 20.
As shown in fig. 1 to 6, in the above embodiment, the cooling device 100 includes a first plate body 50 and a second plate body (not shown in the drawings) disposed opposite to the first plate body 50, as shown in fig. 1 and 2, the first branch flow channel 41 is disposed on each of the first plate body 50 and the second plate body, or, as shown in fig. 3 and 4, when the cooling device 100 further includes the second cooling unit 30, the second branch flow channel 31 and the first branch flow channel 41 of the second cooling unit 30 are disposed on each of the first plate body 50 and the second plate body, and the first plate body 50 and the second plate body are brazed, so that the first plate body 50 and the second plate body cooperate to form a cooling flow channel for flowing the cooling medium introduced through the water inlet 10 to the water outlet 20. Optionally, the height of the cooling channel along the connecting line of the first plate 50 and the second plate is greater than 5mm. Optionally, the width D of the brazing welding is greater than or equal to 8mm, so as to ensure the reliability of the connection between the first plate body 50 and the second plate body, and at the same time, to ensure the sealing performance between two adjacent cooling channels, so as to avoid the liquid leakage phenomenon between the two adjacent cooling channels. The first plate 50 and the second plate may be made of the same material, for example, the first plate 50 and the second plate are made of 3-series aluminum alloy, which has the advantage of good heat conduction effect, thereby improving the heat exchange effect between the cooling device 100 and the battery module.
The embodiment of the present application also provides a battery pack including the cooling device 100 described above and at least one battery module disposed above the cooling device 100, where each battery module is disposed corresponding to the first cooling unit 40 of the cooling device 100, as shown in fig. 1 and 2, or, when the cooling device 100 further includes the second cooling unit 30, as shown in fig. 3 and 4, each battery module is disposed corresponding to the second cooling unit 30 or the first cooling unit 40 of the cooling device 100. Since the structure and advantageous effects of the cooling device 100 have been described in detail in the foregoing embodiments, they will not be described in detail herein.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (17)
1. The utility model provides a cooling device for cool off battery module, its characterized in that includes water inlet, delivery port and sets up side by side the water inlet with a plurality of first cooling unit between the delivery port, first cooling unit is used for the equilibrium the temperature of the relative both sides of battery module, every first cooling unit includes two first runners that set up side by side, every the both ends of first runner respectively with the water inlet with the delivery port intercommunication, arbitrary two of first cooling unit the length and the width homogeneous phase of first runner equal.
2. The cooling apparatus as claimed in claim 1, wherein the first branch flow paths of the plurality of first cooling units have the same length and width, and the water inlet and the water outlet are disposed opposite to each other along a diagonal line of a rectangle formed by the plurality of first cooling units.
3. The cooling apparatus as claimed in claim 1, wherein when the number of the first cooling units is three or more, the water inlets and the water outlets are disposed opposite to each other along a central line of a rectangle formed by the plurality of first cooling units, the lengths of the first branch flow paths of the plurality of first cooling units are equal, and the widths of the first branch flow paths of the plurality of first cooling units are gradually increased along a direction from the central line to an outer edge of the rectangle formed by the plurality of first cooling units.
4. The cooling apparatus according to claim 1, wherein each of the first cooling units includes an introduction flow passage, one end of the introduction flow passage communicates with the water inlet, the other end of the introduction flow passage communicates with two of the first branch flow passages, respectively, and one ends of the two of the first branch flow passages communicating with the introduction flow passage extend toward sides away from each other so that the two first branch flow passages are disposed adjacent to one end of the water outlet communicating with the water outlet.
5. The cooling device according to claim 1, further comprising a second cooling unit arranged in parallel with the first cooling unit, wherein the second cooling unit is used for balancing the temperatures of two opposite sides of the battery module, the second cooling unit comprises a second branch flow passage, the water inlet, the second branch flow passage and the water outlet are sequentially communicated, and the length of each first branch flow passage of the first cooling unit, the length of the second branch flow passage of the second cooling unit and the sum of the lengths of the two first branch flow passages of the first cooling unit are sequentially increased.
6. The cooling device according to claim 5, wherein the second cooling unit is located on one side of the plurality of first cooling units forming a rectangle, the width of the first branch flow channel of the first cooling unit close to the second cooling unit is equal to the width of the second branch flow channel of the second cooling unit, the width of the first branch flow channel of the plurality of first cooling units is gradually increased along a direction from close to the second cooling unit to far from the second cooling unit, and the width of the first branch flow channel of the first cooling unit far from the second cooling unit is less than or equal to 30mm.
7. The cooling device according to claim 6, wherein the water inlet is located at a midpoint of a connecting line between an end of the first cooling unit, which is close to the second cooling unit, and the water inlet, and an end of the second cooling unit, which is close to the second cooling unit, and the water outlet is located at a side of the second cooling unit, which is far away from the first cooling unit.
8. The cooling device according to claim 6, wherein the water inlet is located at a midpoint of a connecting line between an end of the first cooling unit, which is far from the second cooling unit, communicating with the water inlet and an end of the second cooling unit communicating with the water inlet, and the water outlet is located at a side of the second cooling unit, which is far from the first cooling unit.
9. The cooling device according to claim 6, wherein a throttling portion is provided between the water inlet and one end of the second cooling unit communicating with the water inlet, and the throttling portion is used for regulating the flow rate of the cooling medium introduced through the water inlet to the first cooling unit and the second cooling unit between the throttling portion and the second cooling unit.
10. The cooling device as claimed in claim 5, wherein a first confluence portion is provided between the water inlet and an end of the first branch flow passage of the first cooling unit away from the water inlet, the end communicating with the water inlet, the first confluence portion being used for guiding the movement of the cooling medium introduced through the water inlet to the first branch flow passage;
and/or a second confluence part is arranged between the water inlet and one end, communicated with the water inlet, of a second branch flow channel of the second cooling unit, and the second confluence part is used for guiding the movement of a cooling medium introduced through the water inlet to flow to the second branch flow channel.
11. The cooling device according to claim 5, wherein a first guide portion is provided at an end of the first branch flow passage of the first cooling unit, the end communicating with the water outlet, and the first guide portion is used for guiding the movement of the cooling medium in the first branch flow passage to the water outlet;
and/or a second guide part is arranged at one end of a second branch flow channel of the second cooling unit, which is communicated with the water outlet, and the second guide part is used for guiding the movement of the cooling medium in the second branch flow channel, which flows to the water outlet.
12. The cooling device according to claim 11, wherein a first included angle is formed between the extending direction of the first guide portion and the extending direction of the end of the first branch flow channel of the first cooling unit, which is communicated with the water outlet, and the value of the first included angle ranges from 120 ° to 150 °;
and/or a second included angle is formed between the extending direction of the second guide part and the extending direction of one end, communicated with the water outlet, of the second branch flow channel of the second cooling unit, and the value range of the second included angle is 120-150 degrees.
13. The cooling device as claimed in claim 5, wherein a third confluence portion is provided between the water outlet and an end of the first branch flow passage of the first cooling unit away from the water outlet, the end communicating with the water outlet, and the third confluence portion is used for guiding the movement of the cooling medium in the first branch flow passage to the water outlet;
and/or a fourth confluence part is arranged between the water outlet and one end of the second branch flow channel of the second cooling unit, which is communicated with the water outlet, and the fourth confluence part is used for guiding the movement of the cooling medium in the second branch flow channel to flow to the water outlet.
14. The cooling device according to claim 1 or 5, wherein the cooling device includes a first plate body and a second plate body disposed opposite to the first plate body, the first branch flow channel is disposed on each of the first plate body and the second plate body, or when the cooling device further includes a second cooling unit, the first branch flow channel and the second branch flow channel of the second cooling unit are disposed on each of the first plate body and the second plate body, and the first plate body and the second plate body are welded by brazing, so that the first plate body and the second plate body cooperate to form a cooling flow channel through which a cooling medium introduced through the water inlet flows to the water outlet.
15. The cooling device as claimed in claim 14, wherein the height of the cooling channel along the connecting line of the first plate and the second plate is greater than 5mm.
16. The cooling arrangement as recited in claim 14, wherein a width of the braze weld is greater than or equal to 8mm.
17. A battery pack comprising the cooling device according to any one of claims 1 to 16 and at least one battery module disposed above the cooling device, each of the battery modules being disposed corresponding to a first cooling unit of the cooling device, or, when the cooling device further comprises a second cooling unit, each of the battery modules being disposed corresponding to the first cooling unit or the second cooling unit of the cooling device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211129948.8A CN115377548A (en) | 2022-09-16 | 2022-09-16 | Cooling device and battery pack |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211129948.8A CN115377548A (en) | 2022-09-16 | 2022-09-16 | Cooling device and battery pack |
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| CN115377548A true CN115377548A (en) | 2022-11-22 |
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| CN202211129948.8A Pending CN115377548A (en) | 2022-09-16 | 2022-09-16 | Cooling device and battery pack |
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Country or region after: China Address after: 215500 No. 68, Xin'anjiang Road, Southeast street, Changshu, Suzhou, Jiangsu Applicant after: Jiangsu Zhengli New Energy Battery Technology Co.,Ltd. Address before: 215500 No. 68, Xin'anjiang Road, Southeast street, Changshu, Suzhou, Jiangsu Applicant before: Jiangsu Zenergy Battery Technologies Co.,ltd Country or region before: China |
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