CN115332685A - Battery pack heat exchanger assembly and battery pack temperature equalization control method - Google Patents
Battery pack heat exchanger assembly and battery pack temperature equalization control method Download PDFInfo
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- CN115332685A CN115332685A CN202210916162.4A CN202210916162A CN115332685A CN 115332685 A CN115332685 A CN 115332685A CN 202210916162 A CN202210916162 A CN 202210916162A CN 115332685 A CN115332685 A CN 115332685A
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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
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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
- H01M10/63—Control systems
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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
- H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
- H01M10/6567—Liquids
- H01M10/6568—Liquids characterised by flow circuits, e.g. loops, located externally to the cells or cell casings
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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
Abstract
The invention discloses a battery pack heat exchanger assembly and a battery pack temperature equalization control method. The battery pack heat exchanger component adopts a two-stage flow equalizing structural design, and a group of heights are arranged in a flow passage of a water inlet main pipe in an equal ratio relation
The flow distribution sheet forms a primary flow equalizing structure to realize primary uniform flow distribution, so that liquid flow in the water inlet main pipe can be uniformly distributed into each first flow collection cavity, and a plurality of areas are arranged at the joint of the first flow collection panel and the heat exchange plate to form a specific relation
The flow baffle forms a secondary flow equalizing structure to realize secondary uniform flow distributionThe liquid flow in each first collecting cavity can be uniformly distributed into each sub-flow channel in the corresponding heat exchange plate, so that the flow in each sub-flow channel is uniform; when the heat exchanger assembly is used, the flow velocity of liquid flow at any position in the heat exchange plate is basically consistent, and the heat exchange uniformity of the heat exchange plate is high, so that the working temperature of the battery pack can be accurately and uniformly controlled, and the safe charge-discharge multiplying power and the safe cycle life of the battery pack are improved.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a battery pack heat exchanger assembly and a battery pack temperature equalization control method.
Background
In recent years, lithium power batteries and energy storage batteries have a great breakthrough in the aspects of high safety, high power density, high energy density, long cycle life and the like, and become the bottleneck of application development. Research has found that the core of the problem is related to the accurate control of the temperature of the battery pack and the light weight of the battery pack thermal management system. The battery pack thermal management system is one of the most important components of a battery system, and is mainly used for enabling the battery pack to always work within a proper temperature range and ensuring the service performance, safety and service life of the battery pack; its main functions include: when the temperature of the battery is higher, the effective heat dissipation is carried out, so that the thermal runaway accident is prevented; preheating is carried out when the temperature of the battery is lower, so that the temperature of the battery is improved, and the charging and discharging performance and safety at low temperature are ensured; the temperature difference in the battery pack is reduced, the formation of a local hot area is inhibited, the battery at a high-temperature position is prevented from being attenuated too fast, and the service life of the whole battery pack is shortened. At present, a serial thermal management system is generally adopted by a battery pack, and has the advantages of simple structure and low manufacturing difficulty, but the battery pack has poor heat exchange effect, large flow resistance and obvious temperature gradient at the front end and the rear end, so that the control uniformity is poor, and the safety, the rate capability and the cycle life of the battery pack are influenced.
Disclosure of Invention
It is an object of the present invention to provide a battery pack heat exchanger assembly that overcomes the above-mentioned problems of the prior art. The battery pack heat exchanger assembly realizes parallel heat management by adopting a specific two-stage flow equalizing structural design, liquid flows in the sub-runners of the heat exchange plates are uniformly distributed, the flow velocity is basically consistent, the flow resistance is small, and the heat exchange uniformity of the heat exchange plates is improved, so that the working temperature of a battery pack can be controlled more accurately and uniformly, the safe charge-discharge multiplying power of the battery pack is improved, and the cycle life of the battery pack is prolonged. Correspondingly, the invention also provides a battery pack temperature equalization control method.
For the heat exchanger assembly, the technical scheme of the invention is as follows:
the battery pack heat exchanger assembly comprises a first current collecting panel and a second current collecting panel which are arranged in parallel; a group of first collecting cavities which are parallel to each other is arranged inside the first collecting panel, and the inlet of each first collecting cavity is communicated with a water inlet main pipe arranged along the edge of the first collecting panel; the outlets of the second collecting cavities are communicated with water outlet main pipes arranged along the edges of the second collecting panels; each first manifold of the first manifold panel is connected with a corresponding second manifold on the second manifold panel through a heat exchange plate;
the inlet of the first manifold is correspondingly provided with a flow distribution sheet invading into the water inlet main pipe, the direction of the flow distribution sheet is opposite to the direction of liquid flow in the water inlet main pipe, and the head part of the flow distribution sheet is provided with a wedge-shaped tip; the height of each splitter vane is increased in sequence along the direction of liquid flow in the water inlet main pipe; the width of the flow channel of the water inlet main pipe is constant, and the heights of the two adjacent splitter plates meet the following relation:
wherein i is the serial number of the splitter plate, the splitter plates are numbered in sequence, and the serial number of the splitter plate closest to the inlet of the water inlet main pipe is 1; k is a control constant, and the value of k enables the flow shunted to each first manifold to be uniform, so that primary flow equalization is realized;
a group of parallel sub-flow channels are arranged in the heat exchange plate, so that a first manifold and a second manifold distributed at two ends of the heat exchange plate are communicated; the first collecting panel is provided with a first long-groove-shaped opening connected with the heat exchange plate; a group of flow baffle plates are arranged in the first long groove-shaped opening, one baffle plate corresponds to one sub-flow channel of the heat exchange plate, and the area S of each baffle plate 2 The following relationship is satisfied:
wherein j is the serial number of the flow baffle plates, the flow baffle plates are numbered in sequence, and the serial number of the flow baffle plate closest to the water inlet main pipe is 1,S 1 The sectional area of the first manifold, N is the number of sub-runners in one heat exchange plate, and b is the sectional area of a single sub-runner; and m is a control constant and is used for controlling the size of each baffle plate in the first long-groove-shaped opening, so that the flow shunted to each sub-flow passage in the heat exchange plate is uniform, and secondary flow equalization is realized.
Compared with the prior art, the battery pack heat exchanger assembly adopts a two-stage flow equalizing structural design; a group of flow distribution sheets with equal-proportion height are arranged in a flow channel of a water inlet main pipe to form an invasive primary flow equalizing structure, primary uniform flow distribution is realized, liquid flow in the water inlet main pipe can be uniformly distributed into each first flow collecting cavity, a group of flow baffle plates with specific areas are arranged at the joint of the first flow collecting panel and the heat exchange plate to form a secondary flow equalizing structure, secondary uniform flow distribution is realized, liquid flow in each first flow collecting cavity can be uniformly distributed into each sub-flow channel in the corresponding heat exchange plate, and flow in each sub-flow channel of the heat exchange plate is uniform; when the heat exchanger assembly is used, the flow velocity of liquid flow at any position in the heat exchange plate is basically consistent, and the heat exchange uniformity of the heat exchange plate is improved, so that the working temperature of the battery pack can be controlled more accurately and uniformly, and the safe charge-discharge multiplying power and the cycle life of the battery pack are improved.
Preferably, in the above battery pack heat exchanger assembly, the second collecting panel is provided with a second long-groove-shaped opening corresponding to the first long-groove-shaped opening; the two ends of the heat exchange plate are respectively aligned with the first long-groove-shaped opening and the second long-groove-shaped opening, and are fixed and sealed with the first current collecting panel and the second current collecting panel, so that the first current collecting panel, the second current collecting panel and the heat exchange plate are fixedly connected into a whole, and the heat exchange plate is simple in structure and easy to assemble.
Preferably, in the foregoing stack heat exchanger assembly, the inner surface of the flow distribution sheet is arc-shaped (the inner surface is a surface close to the inlet of the first manifold). The inner surface is designed to be arc-shaped, and the flow guide function can be achieved on liquid flow entering the first collecting cavity.
Preferably, in the foregoing battery pack heat exchanger assembly, the baffle plate may have a rectangular shape, a triangular shape, or a special shape.
As an optimization, in the battery pack heat exchanger assembly, the first current collecting panel, the second current collecting panel and the heat exchange plate are all hollow thin-wall structures, and the hollow rate exceeds 80%. The thin-wall structure can accelerate the heat exchange of the heat exchange plate and has good heat exchange effect; on the other hand, the whole weight of the heat exchanger assembly is lighter, and the requirement of light structure is met. Further, the wall thickness of the heat exchange plate is less than 0.5 mm, and the wall thickness of the first collecting panel and the second collecting panel is less than 1 mm; the thickness of the heat exchange plate is 0.5-4 mm, and the distance between two adjacent heat exchange plates is 5-35 mm. Thereby, efficient heat transfer performance of the heat exchanger assembly can be ensured.
Preferably, in the foregoing battery pack heat exchanger assembly, the first current collecting panel and the second current collecting panel may be made of a polymer material through additive manufacturing. Therefore, the current collecting panel has the characteristics of light weight, high strength and high temperature resistance. Further, the heat exchanger plate may be formed of a metal material by thermal extrusion or additive manufacturing. From this for the heat transfer board has sufficient intensity, can directly be the support fixed frame of electric core, realizes the reliable installation of each electric core, and need not to install extra structural component (electric core can directly paste on the heat transfer board through the heat conduction glue), has practiced thrift the manufacturing consumptive material, and further has reduced whole quality.
For the method, the technical scheme of the invention is as follows: the battery pack temperature equalization control method is realized by using the battery pack heat exchanger assembly disclosed by the invention; the battery cell of the battery pack is attached to the heat exchange plate of the battery pack heat exchanger assembly; a water inlet main pipe and a water outlet main pipe of the battery pack heat exchanger assembly are respectively connected with an external heat management control water tank to form a circulation loop, and a water pump is arranged in the circulation loop; when the heat exchanger works, the water pump is started, so that heat exchange water flow enters a flow channel of the water inlet main pipe, and the heat exchange water flow in the water inlet main pipe is uniformly distributed into the first collecting cavities under the action of the primary flow equalizing structure, so that primary flow equalization is realized; the heat exchange water flow in the first collecting cavity is uniformly distributed to the sub-runners in the corresponding heat exchange plates under the action of the secondary flow equalizing structure, so that secondary flow equalization is realized, and the flow of the heat exchange water flow in the sub-runners in the heat exchange plates is uniform; and heat exchange is carried out between the heat exchange water flow in the heat exchange plate and the heat transfer interface of the battery cell, so that the temperature equalization control of the battery cell is realized.
Compared with the prior art, the battery pack temperature equalization control method provided by the invention has the advantages that by adopting a two-stage uniform shunting design, uniform heat exchange water flow can be obtained in each sub-flow channel in each heat exchange plate, so that the battery pack temperature equalization control is realized, the battery pack can be rapidly and efficiently heated and cooled at extreme temperature, the working temperature is maintained in an optimal range, and the requirements of high-rate charge and discharge and the use in high and low temperature occasions are met.
Drawings
FIG. 1 is a schematic structural view of a battery pack heat exchanger assembly of the present invention;
fig. 2 is a schematic structural view of a second collector panel in the present invention;
fig. 3 is a sectional view of a second collector panel in the present invention;
fig. 4 is a schematic structural view of a first collecting panel in the present invention;
fig. 5 is a sectional view of a first collector panel in the present invention;
fig. 6 is an enlarged schematic view of a portion a in fig. 5;
FIG. 7 is a schematic view of an array of baffles in the present invention;
FIG. 8 is a schematic view of a heat exchange plate according to the present invention;
FIG. 9 is a schematic view of a sub-channel of the present invention;
fig. 10 is a schematic view of the assembly of a heat exchanger plate according to the present invention with a first collecting panel;
fig. 11 is a schematic structural view of a battery pack of the present invention.
The labels in the figures are: 1-a first collecting panel, 101-a first collecting cavity, 102-a water inlet manifold, 103-a first long-slot-shaped opening, 104-a flow distribution sheet, 105-a flow baffle; 2-a second collector panel, 201-a second collector, 202-a water outlet manifold, 203-a second elongated slot-like opening; 3-heat exchange plate, 301-sub-flow channel; and 4-electric core.
Detailed Description
The following further describes the present application with reference to the drawings and examples, but the present application is not limited thereto.
Referring to fig. 1 to 10, the battery pack heat exchanger assembly of the present invention includes a first current collecting panel 1 and a second current collecting panel 2 disposed in parallel with each other; a group of first collecting cavities 101 which are parallel to each other are arranged inside the first collecting panel 1, and the inlet of each first collecting cavity 101 is communicated with a water inlet manifold 102 arranged along the edge of the first collecting panel 1; the outlets of the second collecting cavities 201 are communicated with water outlet manifolds 202 arranged along the edges of the second collecting panels 2; each first manifold 101 of the first manifold plate 1 is connected with a corresponding second manifold 201 on the second manifold plate 2 through a heat exchange plate 3;
the inlet of the first manifold 101 is correspondingly provided with a flow dividing sheet 104 invading into the water inlet main pipe 102 (the position of the first manifold 101 farthest from the inlet of the water inlet main pipe 102 is not provided with the corresponding flow dividing sheet 104), the flow dividing sheet 104 faces to the direction opposite to the flow direction in the water inlet main pipe 102, the head part of the flow dividing sheet has a wedge-shaped tip (used for reducing flow resistance), and the inner surface of the flow dividing sheet is arc-shaped (used for guiding flow); the height of each splitter 104 is sequentially increased along the direction of the liquid flow in the water inlet main pipe 102 (the splitter 104 is fixed on the inner wall of the water inlet main pipe 102, a height difference exists between two adjacent splitter 104, a first-stage splitter opening is formed between the two splitter 104, and the liquid flow flows into the corresponding first manifold 101 from the first-stage splitter opening); the width of the flow channel of the water inlet main pipe 102 is constant (the water inlet main pipe 102 can be a square pipe), and the heights of two adjacent splitter plates 104 satisfy the following relation:
wherein i is the serial number of the splitter 104, the splitter 104 is numbered sequentially, and the serial number of the splitter 104 closest to the inlet of the water inlet main 102 is 1; k is a control constant, and the value of k enables the flow distributed to each first manifold 101 to be uniform, so that primary flow equalization is realized;
a group of parallel sub-flow channels 301 are arranged inside the heat exchange plate 3, so that a first manifold 101 and a second manifold 201 distributed at two ends of the heat exchange plate are communicated; a first long slot-shaped opening 103 connected with the heat exchange plate 3 is arranged on the first collecting panel 1; a group of flow baffles 105 are arranged in the first long-groove-shaped opening 103, one flow baffle 105 corresponds to one sub-flow channel 301 of the heat exchange plate 3, the flow baffles 105 are rectangular, and the area S of each flow baffle 105 2 The following relationship is satisfied:
wherein j is the serial number of the flow baffle 105, the flow baffles 105 are numbered sequentially, and the serial number of the flow baffle 105 nearest to the water inlet main 102 is 1,S 1 The sectional area of the first manifold 101, N is the number of the sub-channels 301 in one heat exchange plate 3, b is the sectional area of a single sub-channel 301, and m is a control constant, and is used for controlling the size of each baffle plate 105 in the first elongated slot-shaped opening 103, so that the flow shunted to each sub-channel 301 in the heat exchange plate 3 is uniform, and secondary flow equalization is realized.
The number N of sub-channels 301 in the heat exchange plate 3 is designed according to the heat exchange and structural strength requirements of the battery pack. Through a number of simulation studies, the degree of uniformity of the secondary flow equalization is limited by the cross-section S of the primary manifold 101 1 The ratio to the total cross-section nxb of the heat exchanger plate 3. Thus, the governing equation couples a governing constant m, with a preferred range of m between 1 and 3 (in a particular application)In the process, the value of m can be finely adjusted to more effectively achieve the purpose of current sharing); s 1 The smaller the value of/(Nxb), the larger the baffle 105 size needs to be to achieve uniform flow. Based on the control equation, the farther from the water inlet main pipe 102, the smaller the size of the baffle plate 105, and the sub-flow channel 301 farthest from the water inlet main pipe 102 has no corresponding baffle plate 105, so as to achieve uniform flow and minimum flow resistance of each sub-flow channel 301 in the heat exchange plate 3.
A set of splitter plates 104 with equal height ratio are arranged in the water inlet main pipe 102 to form an invasive one-level flow equalizing structure, the flow equalizing structure can intercept and dredge liquid flow in a head-on manner to realize uniform flow division, high flow resistance caused by traditional flow-blocking type flow division (such as valves, partition plates, small holes and the like) is avoided, and uniform flow division can be realized under any inlet flow. The flow equalizing structure is designed based on the fluid motion principle, and the heights of the flow dividing plates 104 distributed along the flow direction of the liquid flow are in an equal ratio array relation h i+1 /h i K (= k). Ideally, due to the presence of the splitter plates 104, the flow within the inlet manifold 102 is split into two at the tip of each splitter plate 104; the pipe diameter is reduced gradually along the flowing direction of liquid flow in an arithmetic progression, the flow rate in the pipe Q = v × S, v is the flow speed in the water inlet main pipe 102, S is the sectional area of the water inlet main pipe 102, Q is reduced by an equal part every time the pipe passes through a branch opening, S is also reduced by an equal part correspondingly, and v can meet the requirement of constancy. Therefore, the same flow rate of each splitter 104 can be achieved only by setting the projection height Δ h of the gaps of the adjacent splitter 104 in the flow direction of the liquid flow to be a constant value, and Q is i = v × Δ h × w, where w is the pipe width, is a constant value. At this time, h i+1 ＝h i +Δh；h i And h i+1 Are respectively a front part and a rear part height of the diverter blade 104. The more distant the diversion port is from the water inlet, the more loss that needs to be compensated for, due to the flow resistance and the transverse turbulence, the more loss per unit volume of liquid that needs to be compensated for when it travels to the diversion port i, is approximately linear with the distance traveled, so that the value of v also decreases linearly in the direction of flow of the liquid stream. As a compensation, Δ h also needs to be linearly increased to achieve a constant split flow, i.e., Δ h = m × h i And m is a compensation coefficient. Thus, h i+1 ＝h i +m×h i ＝h i (1+m) k =1+m as constant, h is shown i The true geometric series. The k value is obtained by fluid simulation, and the value range is generally that k is more than or equal to 1.01 and less than or equal to 1.2; in a specific application, the value of k varies to achieve more effective flow equalization, and the value of k depends on a series of system conditions and parameters, such as liquid flow composition, temperature, flow rate, pipe shape and size, etc.
Example (b):
in this embodiment, the second collecting panel 2 is provided with a second long slot-like opening 203 corresponding to the first long slot-like opening 103; the two ends of the heat exchange plate 3 are aligned with the first long groove-shaped opening 103 and the second long groove-shaped opening 203 respectively, and are fixed and sealed with the first collecting panel 1 and the second collecting panel 2, so that the first collecting panel 1, the second collecting panel 3 and the heat exchange plate 5 are fixedly connected into a whole, and the structure is simple and easy to assemble. The first collecting panel 1, the second collecting panel 3 and the heat exchange plate 3 can be connected and fixed by screws through sealing rings and then sealed by sealant.
In the embodiment, the first current collecting panel 1, the second current collecting panel 2 and the heat exchange plate 5 are all hollow thin-wall structures, and the hollow rate exceeds 90%; the wall thickness of the heat exchange plate 5 is 0.3 mm, the overall thickness is 2 mm, and the distance between two adjacent heat exchange plates 5 is 15 mm; the wall thickness of the first collecting panel 1 and the second collecting panel 2 was 0.8 mm. From this, can guarantee the high-efficient heat transfer performance of heat exchanger subassembly, the whole weight of heat exchanger subassembly is lighter moreover, can satisfy the requirement of lightweight structure.
In this embodiment, the first collecting panel 1 and the second collecting panel 2 are integrally formed, and both adopt nylon PA66 powder for 3D printing. The nylon powder had a size average particle size of 60 microns. The method specifically comprises the following steps: 1) Preheating equipment, and enabling the whole building chamber and the nylon powder to reach a temperature slightly lower than a sintering point, namely about 230 ℃; 2) The roller produces a thin and flat layer of powder over the entire platform (working area); 3) Laser selective sintering of regions using a laser as CO 2 Laser, power 40W, a specific layer cross section of the article was manufactured according to the code; 4) The platform is lowered by 30 microns and the powder is spread again; 5) Multiple repetition of printerThe first three steps are completed until the last layer is completed; 6) Cooling the powder before it can be removed from the apparatus; 7) The part is removed from the powder bed and subjected to the necessary post-processing.
Further, the heat exchange plate 3 is subjected to 3D printing by using an aluminum material with high thermal conductivity; the printing process is selective laser melting, and the specific material is AlSi10Mg aluminum alloy. The metal powder has an average particle size of 30 micrometers, and specifically comprises the following steps: 1) Preheating the equipment, wherein the whole building chamber and the metal powder reach the temperature slightly lower than the sintering point and about 300 ℃; 2) The powder scraper spreads a thin and flat powder layer across the platform (working area); 3) A laser selective sintering area, wherein a YAG fiber laser is used as a laser, the power is 400W, the scanning speed is 0.8 m/s, an island scanning strategy is adopted, and a two-dimensional section of a layer of part is manufactured by scanning and sintering a powder bed according to a generated control code; 4) The powder platform is lowered by 25 microns and the powder is spread again; 5) The printer repeats the first three steps for many times until the last layer is finished; 6) Cooling the powder before it can be removed from the apparatus; 7) The part is removed from the powder bed and subjected to the necessary post-processing.
The heat exchanger plates 3 may also be formed by thermal extrusion or cut from an aluminium profile with parallel flow micro channels.
In the embodiment, according to the specific shape design and material selection of the first collecting panel 1 and the heat exchange plate 3, in combination with a fluid simulation result, the value of k is 1.04, and the value of m is 1.2 in a control equation; the number N of the sub-runners 301 in the heat exchange plate 3 is 12; the number of heat exchanger plates 3 is 15 (i.e. the number of first and second manifolds 101 and 201 is 15); in this case, a substantially uniform flow rate in each of the first manifold 101 and each of the sub-channels 301 can be achieved, with the measured flow rate results as shown in tables 1 and 2 (water flow rate into the water inlet manifold 102 of 0.08 Kg/s):
table 1: first order split result
Table 2: second order split results
| Number of sub-channels in heat exchanger plate | Area of flow baffle (mm) 2 ) | Flow rate (10) -4 Kg/s) |
| 1 | 10 | 4.22 |
| 2 | 9.1 | 4.13 |
| 3 | 8.2 | 3.86 |
| 4 | 7.3 | 4.04 |
| 5 | 6.4 | 4.31 |
| 6 | 5.5 | 4.22 |
| 7 | 4.6 | 4.16 |
| 8 | 3.7 | 4.25 |
| 9 | 2.8 | 4.32 |
| 10 | 1.9 | 4.28 |
| 11 | 1 | 4.09 |
| 12 | 0 | 4.13 |
As a specific application of the battery pack heat exchanger assembly of the present invention:
referring to fig. 11, the battery pack includes a battery cell 4 and a heat exchanger assembly; the heat exchanger assembly is the aforementioned battery pack heat exchanger assembly of the present invention; the battery cell 4 is adhered to the heat exchange plates 3 through heat conducting glue (or heat conducting silica gel), and the battery cell 4 is adhered to two sides of each heat exchange plate 3; the battery cell 4 is a 40Wh soft package battery cell (a battery active material can also be selected); the total weight of the battery core 4 accounts for more than 90% of the total weight of the battery pack.
The energy density of the battery pack exceeds 200 watt-hour/kilogram, and the density of a heat exchange and conduction interface inside the battery pack is higher than 3000 square centimeters/kilowatt-hour.
The temperature equalization control method of the battery pack of the invention comprises the following steps:
the water inlet main pipe 102 and the water outlet main pipe 202 are connected with an external heat management control water tank to form a circulation loop, and a water pump is arranged in the circulation loop; when the water-cooled heat exchanger works, the water pump is started, so that heat exchange water flow (the heat exchange water flow not only refers to water, but also refers to other water solutions meeting heat exchange requirements) enters the flow channel of the water inlet main pipe 102, and the heat exchange water flow in the water inlet main pipe is uniformly distributed into the first collecting cavities under the action of the primary flow equalizing structure, so that primary flow equalization is realized; the heat exchange water flow in the first manifold 101 is uniformly distributed to the sub-runners 301 in the corresponding heat exchange plates under the action of the secondary flow equalizing structure, so that secondary flow equalization is realized, and the flow of the heat exchange water flow in the sub-runners 301 in the heat exchange plates 3 is uniform; the heat exchange water flow in the heat exchange plate 3 exchanges heat with the heat transfer interface of the battery cell 4, and the temperature equalization control of the battery cell is realized.
After the secondary uniform shunting, uniform heat exchange water flow can be obtained in each sub-channel 301 in each heat exchange plate 3, so that a large number of heat exchange interfaces are provided for efficient heat transfer, the whole battery pack can work in a range of 32-37 ℃ all the time under a 10C super-multiplying power charging and discharging working condition, the space temperature difference of the full-power operation of the whole battery pack is not more than 3 ℃, and the time temperature difference is not more than 5 ℃.
The above general description of the invention and the description of its specific embodiments in this application should not be construed as limiting the technical solutions of the invention. Those skilled in the art can add, reduce or combine the technical features disclosed in the general description and/or the specific embodiments (including the examples) to form other technical solutions within the protection scope of the present application according to the disclosure of the present application without departing from the structural elements of the present invention. The battery pack of the present invention generally refers to an energy storage system composed of a battery cell, a circuit, a battery management system, a mechanical component, a housing, a thermal management component, etc., and the size, capacity, packaging mode, and integration mode with other systems of the system are not limited, and should be equivalent to the common similar terms of battery pack, battery system, etc.
Claims (10)
1. The battery pack heat exchanger assembly is characterized by comprising a first current collecting panel (1) and a second current collecting panel (2) which are arranged in parallel; a group of first collecting cavities (101) which are parallel to each other are arranged inside the first collecting panel (1), and inlets of the first collecting cavities (101) are communicated with a water inlet main pipe (102) arranged along the edge of the first collecting panel (1); the outlets of the second collecting chambers (201) are communicated with a water outlet main pipe (202) arranged along the edge of the second collecting panel (2); each first collecting cavity (101) of the first collecting panel (1) is connected with a corresponding second collecting cavity (201) on the second collecting panel (2) through a heat exchange plate (3);
the inlet of the first manifold (101) is correspondingly provided with a flow dividing sheet (104) invading into the water inlet main pipe (102), the flow dividing sheet (104) faces to the direction opposite to the flow direction in the water inlet main pipe (102), and the head part of the flow dividing sheet has a wedge-shaped tip; the height of each flow distribution sheet (104) is increased along the direction of liquid flow in the water inlet main pipe (102) in sequence; the width of the flow channel of the water inlet main pipe (102) is constant, and the heights of two adjacent splitter plates (104) meet the following relation:
wherein i is the serial number of the splitter plate (104), the splitter plates (104) are numbered sequentially, and the serial number of the splitter plate (104) closest to the inlet of the water inlet main pipe (102) is 1; k is a control constant, and the value of k enables the flow distributed to each first manifold (101) to be uniform, so that primary flow equalization is realized;
a group of parallel sub-flow channels (301) are arranged in the heat exchange plate (3) so that a first manifold (101) and a second manifold (201) distributed at two ends of the heat exchange plate are communicated; a first long groove-shaped opening (103) connected with the heat exchange plate (3) is arranged on the first collecting panel (1); a group of flow baffles (105) are arranged in the first long-groove-shaped opening (103), one flow baffle (105) corresponds to one sub-flow channel (301) of the heat exchange plate (3), and the area S of each flow baffle (105) 2 The following relationship is satisfied:
wherein j is the serial number of the flow baffle plates (105), the flow baffle plates (105) are numbered in sequence, and the serial number of the flow baffle plate (105) nearest to the water inlet main pipe (102) is 1,S 1 Is the sectional area of the first manifold (101), N is the number of sub-runners (301) in one heat exchange plate (3), and b is the sectional area of a single sub-runner (301); m is a control constant and is used for controlling the size of each flow baffle (105) in the first long-groove-shaped opening (103), so that the flow shunted to each sub-flow passage (301) in the heat exchange plate (3) is uniform, and secondary flow equalization is realized.
2. The battery pack heat exchanger assembly of claim 1, wherein: a second long-groove-shaped opening (203) corresponding to the first long-groove-shaped opening (103) is arranged on the second current collecting panel (2); the two ends of the heat exchange plate (3) are respectively aligned with the first long groove-shaped opening (103) and the second long groove-shaped opening (203) and are fixed and sealed with the first collecting panel (1) and the second collecting panel (2).
3. The battery pack heat exchanger assembly of claim 1, wherein: the inner surface of the splitter plate (104) is arc-shaped.
4. The battery pack heat exchanger assembly of claim 1, wherein: the flow baffle plate (105) is rectangular, triangular or special-shaped.
5. The battery pack heat exchanger assembly of claim 1, wherein: the first current collecting panel (1), the second current collecting panel (2) and the heat exchange plate (3) are of hollow thin-wall structures.
6. The battery pack heat exchanger assembly of claim 5, wherein: the thickness of the heat exchange plate (3) is 0.5-4 mm.
7. The battery pack heat exchanger assembly of claim 6, wherein: the distance between two adjacent heat exchange plates (3) is 5-35 mm.
8. The battery pack heat exchanger assembly of claim 5, wherein: the first current collecting panel (1) and the second current collecting panel (2) are both made of high polymer materials through additive manufacturing.
9. The battery pack heat exchanger assembly of claim 6, wherein: the heat exchange plate (3) is made of metal materials through thermal extrusion or additive manufacturing and molding.
10. The battery pack temperature equalization control method is characterized by comprising the following steps: the method is implemented using the battery pack heat exchanger assembly of claim 1; the battery cell (4) of the battery pack is attached to the heat exchange plate (3) of the battery pack heat exchanger assembly; a water inlet main pipe (102) and a water outlet main pipe (202) of the battery pack heat exchanger assembly are respectively connected with an external heat management control water tank to form a circulation loop; a water pump is arranged in the circulating loop; when the water pump works, the water pump is started, so that heat exchange water flow enters a flow channel of the water inlet main pipe (102), and the heat exchange water flow in the water inlet main pipe (102) is uniformly distributed into the first collecting cavities (101) under the action of the primary flow equalizing structure, so that primary flow equalization is realized; the heat exchange water flow in the first collecting cavity (101) is uniformly distributed to the sub-runners (301) in the corresponding heat exchange plates (3) under the action of the secondary flow equalizing structure, secondary flow equalization is realized, and the flow of the heat exchange water flow in the sub-runners (301) in the heat exchange plates (3) is uniform; the heat exchange water flow in the heat exchange plate (3) exchanges heat with the heat transfer interface of the battery cell (4), so that the temperature equalization control of the battery cell (4) is realized.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210916162.4A CN115332685A (en) | 2022-08-01 | 2022-08-01 | Battery pack heat exchanger assembly and battery pack temperature equalization control method |
| PCT/CN2023/108388 WO2024027510A1 (en) | 2022-08-01 | 2023-07-20 | Battery pack heat exchanger assembly and battery pack temperature equalization control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210916162.4A CN115332685A (en) | 2022-08-01 | 2022-08-01 | Battery pack heat exchanger assembly and battery pack temperature equalization control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115332685A true CN115332685A (en) | 2022-11-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210916162.4A Pending CN115332685A (en) | 2022-08-01 | 2022-08-01 | Battery pack heat exchanger assembly and battery pack temperature equalization control method |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN115332685A (en) |
| WO (1) | WO2024027510A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024027510A1 (en) * | 2022-08-01 | 2024-02-08 | 南昌安亚数能科技有限公司 | Battery pack heat exchanger assembly and battery pack temperature equalization control method |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016191881A1 (en) * | 2015-06-04 | 2016-12-08 | Dana Canada Corporation | Heat exchanger with regional flow distribution for uniform cooling of battery cells |
| CN109638378B (en) * | 2018-11-15 | 2021-08-31 | 江苏科技大学 | Heat management device of new energy automobile battery power system |
| CN212458050U (en) * | 2020-10-09 | 2021-02-02 | 北京丰联奥睿科技有限公司 | Soaking cold plate heat exchanger |
| CN113624043B (en) * | 2021-08-06 | 2022-08-12 | 合肥工业大学 | Temperature-equalizing distributed parallel micro-flow-channel heat exchanger and application thereof |
| CN115332685A (en) * | 2022-08-01 | 2022-11-11 | 台州学院 | Battery pack heat exchanger assembly and battery pack temperature equalization control method |
-
2022
- 2022-08-01 CN CN202210916162.4A patent/CN115332685A/en active Pending
-
2023
- 2023-07-20 WO PCT/CN2023/108388 patent/WO2024027510A1/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024027510A1 (en) * | 2022-08-01 | 2024-02-08 | 南昌安亚数能科技有限公司 | Battery pack heat exchanger assembly and battery pack temperature equalization control method |
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| Publication number | Publication date |
|---|---|
| WO2024027510A1 (en) | 2024-02-08 |
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