CN113793998A - Battery heat dissipation system and battery heat dissipation method - Google Patents
Battery heat dissipation system and battery heat dissipation method Download PDFInfo
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- CN113793998A CN113793998A CN202110892776.9A CN202110892776A CN113793998A CN 113793998 A CN113793998 A CN 113793998A CN 202110892776 A CN202110892776 A CN 202110892776A CN 113793998 A CN113793998 A CN 113793998A
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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
- H01M10/62—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
- H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
- H01M10/6567—Liquids
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E60/10—Energy storage using batteries
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Abstract
The invention discloses a battery heat dissipation system and a battery heat dissipation method, wherein the battery heat dissipation system comprises: battery equipment and liquid cooling board, battery equipment direct mount be in on the liquid cooling board, in order with the produced heat transfer of battery equipment extremely the liquid cooling board cools off, in order to right battery equipment dispels the heat. By adopting the invention, the technical problems that the battery can not sufficiently dissipate heat, can not meet the heat dissipation requirement of the battery in the quick charging process and the like in the prior art can be solved.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a battery heat dissipation system and a battery heat dissipation method.
Background
The slow charging is still one of the main factors restricting the development of the pure electric vehicle. The main technical means for shortening the charging time is to increase the charging current of the battery. But the charging current increases with the accompanying increaseThe problems of increased heat generation quantity of the battery, increased risk of lithium precipitation and the like are solved. At higher charging currents, irreversible heat is the primary source of battery heat. The temperature rise of the battery caused by the rapid charging process has a serious influence on the service life of the lithium ion battery. In general, Li+And is removed from the positive electrode of the battery, migrates to the surface of the negative electrode, and is then inserted into the negative electrode, but when the surface of the negative electrode is excessively high or the temperature is excessively low due to an excessive current, polarization occurs greatly. When the polarization potential of the negative electrode surface is lower than that of metallic Li, Li+It precipitates as metallic Li on the surface of the negative electrode, resulting in a loss of battery capacity. In severe cases, even puncture of the septum can lead to serious safety hazards.
Furthermore, powdering and breakage of the electrodes are common problems for lithium ion batteries. The loss of active material due to pulverization and breakage of the electrodes is a common mechanism for the degradation of lithium ion batteries. The chalking and crushing phenomena include: cracks inside the active material particles; the active substance particles are separated from the conductive agent and the adhesive; peeling between the electrode and the current collector. One of the main reasons for electrode pulverization and breakage is that the charging current is too large to cause the change of lithium concentration inside the battery, and during the rapid charging process, due to the fact that the speed of removing and inserting Li is high, a significant Li concentration gradient can be generated inside the positive electrode and the negative electrode, so that the stress inside the lithium ion battery is unevenly distributed, active material particles are broken, the electrodes are peeled off, and the like, and the loss of active materials is caused.
To the problem of battery heat production, present main heat dissipation technique has: cooling the battery by air cooling; performing liquid cooling on the battery; performing direct cooling on the battery; and carrying out oil cooling on the battery. However, in practice, the air-cooled heat dissipation technology requires severe conditions, and the oil-cooled and direct-cooled heat dissipation technologies are not suitable for large-scale application. At present, the liquid cooling technology is really widely applied to battery automobiles, and particularly heat transfer is carried out between a battery and a liquid cooling plate through contact of heat conducting glue, but the heat conductivity coefficient of the heat conducting glue is generally in the range of 0.5-3W/(m.k), and is two orders of magnitude lower than that of metal, so that the heat can not be sufficiently and rapidly transferred to a certain extent, and the requirement of battery heat dissipation in the quick charging process can not be met.
Disclosure of Invention
The embodiment of the application provides a battery heat dissipation system and a battery heat dissipation method, so that the problem that the heat dissipation requirement of a battery in a quick charging process cannot be met in the prior art is solved, and the heat dissipation efficiency of the battery is favorably improved.
In one aspect, the present application provides a battery cooling system through an embodiment of the present application, the battery cooling system includes battery equipment and a liquid cooling plate, the battery equipment is installed on the liquid cooling plate, wherein, the produced heat of battery equipment can be transferred to the liquid cooling plate cools down, in order to right the battery equipment dispels the heat.
Optionally, the battery device includes a battery cell, or a battery module.
Optionally, the battery equipment is welded on the surface of the liquid cooling plate by adopting a welding process, wherein the bottom flatness of the battery equipment is not more than 0.5mm, and the flatness of a plane where the battery equipment and the liquid cooling plate are welded is not more than 0.5 mm.
Optionally, a plurality of pits are designed on the liquid cooling plate according to the bottom size of the battery device, the battery device is correspondingly arranged in the pits, wherein the bottom flatness of the battery device is not more than 0.5mm, and the flatness of a plane where the battery device and the liquid cooling plate are welded is not more than 0.5 mm.
Optionally, a corresponding hollow ring belt is designed when the bottom of the housing of the battery equipment is manufactured, and a corresponding fixing member is additionally designed on the liquid cooling plate so as to penetrate through the hollow ring belt of the battery equipment to fix the battery equipment on the liquid cooling plate.
Optionally, the battery heat dissipation system further includes a heat dissipation panel attached to at least one side of the battery device to transfer top heat of the battery device to the liquid cooling plate for cooling.
Optionally, the heat dissipation panel comprises a metal plate, and/or a phase change material.
In another aspect, the present application provides a battery heat dissipation method applied to a battery heat dissipation system including a battery device and a liquid cooling plate, where the method includes:
when a quick charge request signal aiming at the battery equipment is detected, acquiring a charge control parameter of the battery equipment, wherein the charge control parameter at least comprises a charge voltage;
when the charging control parameter meets a preset current adjustment condition, recalculating a target charging current of the battery equipment according to the charging control parameter;
and adjusting the current charging current of the battery equipment to the target charging current for charging, and increasing the refrigerating power of the liquid cooling plate so as to dissipate the heat of the battery equipment.
Optionally, the charge control parameter further includes a temperature rise rate, and before recalculating the target charging current of the battery device according to the charge control parameter, the method further includes:
judging whether the charging control parameters meet preset current regulation conditions or not, wherein the method specifically comprises the following steps: judging whether the temperature rise rate exceeds a preset temperature rise or not, and judging whether the charging voltage does not exceed a preset voltage or not;
and if the temperature rise rate is judged to exceed the preset temperature rise, and the charging voltage does not exceed the preset voltage, determining that the charging control parameter meets the preset current adjustment condition.
Optionally, the charge control parameter further includes an internal battery resistance, and before the target charge current of the battery device is recalculated according to the charge control parameter, the method further includes:
judging whether the charging control parameters meet preset current regulation conditions or not, wherein the method specifically comprises the following steps: judging whether the internal resistance of the battery exceeds a preset internal resistance or not, and judging whether the charging voltage does not exceed a preset voltage or not;
and if the internal resistance of the battery exceeds the preset internal resistance and the charging voltage does not exceed the preset voltage, determining that the charging control parameter meets the preset current adjustment condition.
On the other hand, the present application provides a computer-readable storage medium storing a program that executes the battery heat dissipation method as described above when the program runs on a terminal device, through an embodiment of the present application.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages: the application provides a battery cooling system includes: battery equipment and liquid cooling board, battery equipment direct mount will the produced heat transfer of battery equipment extremely on the liquid cooling board cools off, thereby it is right to realize the heat dissipation of battery equipment. The battery equipment and the liquid cooling plate are integrally designed, so that structural glue corresponding to heat conducting glue is omitted, the heat dissipation efficiency of the battery equipment can be improved by one to two orders of magnitude, and the technical problems that in the prior art, the battery cannot be fully cooled, and the heat dissipation requirement of the battery in the quick charging process cannot be met are solved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a battery cooling system according to an embodiment of the present application.
Fig. 2 is a schematic structural diagram of a battery cooling system in which a battery core and a liquid cooling plate are welded according to an embodiment of the present application.
Fig. 3 is a schematic structural diagram of a battery heat dissipation system in which a battery module is welded to a liquid cooling plate according to an embodiment of the present disclosure.
Fig. 4 is a schematic structural diagram of a battery heat dissipation system in which a battery cell is disposed in a liquid cooling plate pit slot according to an embodiment of the present application.
Fig. 5 is a schematic structural diagram of a battery heat dissipation system in which a battery module is disposed in a liquid cooling plate pit provided in an embodiment of the present application.
Fig. 6-9 are schematic structural views of battery heat dissipation systems corresponding to fixing members of which hollow annular bands penetrate through a liquid cooling plate of several battery devices provided by the embodiments of the present application.
Fig. 10 to fig. 11 are schematic diagrams of two types of heat dissipation panels attached to the side surfaces of a battery device according to an embodiment of the present application.
Fig. 12 is a schematic flowchart of a method for dissipating heat from a battery according to an embodiment of the present disclosure.
Fig. 13-14 are schematic flow charts of another two methods for dissipating heat of a battery according to the embodiment of the present disclosure.
Detailed Description
The applicant has also found in the course of the present application that: in the air-cooled cooling technology, heat is removed by introducing cooled and condensed cold air into the battery pack and flowing the air over the surface of the heat generating component. The air cooling method is divided into two types: if the relative motion of the automobile and the air is utilized to introduce the air into the battery pack, the passive air cooling is called; if air is introduced into the interior of the battery pack by a blower, it is called forced air cooling.
The liquid cooling technology is the most mainstream cooling method at present, generally, the heat of the battery is transferred to the liquid cooling plate through a heat conduction mechanism, and the heat is taken away by cooling liquid through condensation and free circulation flow, so that the temperature of the whole battery pack is uniform. The heat-conducting medium is the best auxiliary material of the liquid cooling scheme, and the good insulating property of the heat-conducting silica gel pad and the high resilience toughness of the heat-conducting glue in the heat-conducting medium can effectively avoid the vibration friction between the electric cores. When the cell is in direct contact with the liquid, the liquid must be insulated (e.g., mineral oil) to avoid short circuits. Meanwhile, the requirement on the air tightness of the liquid cooling system is also high.
The direct cooling technology (refrigerant direct cooling) utilizes the principle of latent heat of evaporation of the refrigerant (R134a) to establish an air conditioning system in a whole vehicle or a battery system, an evaporator of the air conditioning system is installed in the battery system, the refrigerant evaporates in the evaporator and takes away heat of the battery system quickly and efficiently, and therefore the effect of cooling the battery system is achieved.
In addition, the existing air-cooled battery pack has long air-cooled flow channels, internal flow fields are difficult to balance, so that the difference of cooling effects in different areas is caused, and the problems of large battery temperature difference, incapability of preventing water and dust, large volume, high cost and the like exist. Particularly, under some closed conditions, the air cooling mode is adopted for heat dissipation, the temperature of the battery pack is difficult to drop, the service life of the battery pack is influenced, and the use cost is high.
The oil cooling technology and the refrigerant direct cooling technology have a certain distance from large-scale application at present, and some problems still need to be solved. For example, oil cooling techniques may cause inconvenience to the maintenance of the battery pack; the cost of the refrigerant direct cooling technology is higher at present, and the temperature difference inside the battery pack is easy to be larger.
The liquid cooling technology is a technology which is really and widely applied to the electric automobile at present, and can give consideration to both cost and cooling effect. Generally, a scheme of a bottom liquid cooling plate is adopted, and heat transfer is carried out between the battery and the liquid cooling plate through contact of heat conducting glue. As the heat conduction system of the heat conduction glue is generally in the range of 0.5-3W/(m.K), the heat conduction coefficient is two orders of magnitude lower than that of metal, for example, the heat conduction coefficient of metal aluminum is as high as 230W/(m.K). Therefore, heat cannot be transferred sufficiently quickly to some extent. There is a great gap between the fast charging process and the high heat dissipation requirement of the high-power charging process of the battery, that is, the heat dissipation requirement of the battery in the fast charging process cannot be met.
The embodiment of the application provides a battery heat dissipation system and a battery heat dissipation method, and solves the technical problems that in the prior art, a battery cannot sufficiently dissipate heat, cannot meet the heat dissipation requirement of the battery in a quick charging process, and the like.
In order to solve the technical problems, the general idea of the embodiment of the application is as follows: the application provides a battery cooling system includes battery equipment and liquid cooling board, battery equipment installs on the liquid cooling board, will the produced heat transfer of battery equipment extremely the liquid cooling board cools off, with right the battery equipment dispels the heat.
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
First, it is stated that the term "and/or" appearing herein is merely one type of associative relationship that describes an associated object, meaning that three types of relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
To the demand of battery (package) quick charge in-process heat dissipation capacity to combine not enough of current liquid cooling technical scheme, this application has proposed the design with battery equipment and liquid cooling board integration. Through the integrated design, the heat generated by the battery equipment is directly transmitted to the liquid cooling plate at the lower part through the shell of the battery equipment, so that the heat dissipation efficiency is improved by 1-2 orders of magnitude. Wherein, the thought of integrated design includes but is not limited to: welding the battery equipment (a battery cell or a shell of a battery module) and the liquid cooling plate together; the bottom shell of the battery equipment is embedded in the surface layer of the liquid cooling plate; electronic devices nested on a liquid cooled plate, and so on.
The applicant has also found that the design solution, while improving heat dissipation, brings the following problems: the temperature difference between the upper part and the lower part of the battery equipment is too large (namely, the temperature difference is large), namely, the heat at the bottom of the battery equipment is rapidly taken away by the liquid cooling plate, but the heat at the upper part of the battery equipment needs a certain time to be transferred to the lower part of the battery equipment, and the heat transfer rate cannot keep up with the bottom heat dissipation efficiency. The temperature difference is large, so that the diffusion and migration rates of lithium ions at the upper part and the lower part of the pole roll are different, and the pole roll at the lower part is easy to have interface problems, such as lithium separation during charging. In order to solve the above problems, the present application proposes to add a heat dissipation panel (also referred to as a metal cladding layer) to the side of the battery device, so that the heat on the upper portion of the battery device can be transferred to the liquid cooling plate through the shell, and the temperature difference problem of heat conduction can be effectively solved after a plurality of heat dissipation channels are added.
Fig. 1 is a schematic structural diagram of a battery cooling system according to an embodiment of the present disclosure. The battery heat dissipation system 10 shown in fig. 1 includes a battery device 100 and a liquid-cooled panel 200. The present application will the battery device 100 is directly installed on the liquid cooling plate 200, and the heat generated by the battery device 100 is transferred to the liquid cooling plate 200 for cooling, so as to achieve the purpose of dissipating heat of the battery device 100. Optionally, the battery device 100 may specifically be a battery electric core 101, a battery module 102, or other power supply devices, and the application is not limited thereto. For a single battery apparatus 100, it may include a plurality of battery modules 102, and each battery module 102 may include a plurality of battery cells 101, which is not limited in the present application.
In one embodiment, the specific implementation of the battery device 100 mounted on the liquid cooling plate 200 is as follows: the battery device 100 and the liquid-cooled plate 200 are welded together using a welding process.
In an embodiment, the battery device 100 is a battery cell 101, and fig. 2 is a schematic structural diagram of a battery heat dissipation system in which the battery cell 101 is welded on a surface of a liquid-cooled plate 200 according to an embodiment of the present disclosure. As shown in fig. 2, the present application may weld the bottom of the housing of the battery cell 101 and the liquid cooling plate together by a means such as a polymer welding process. The bottom flatness of the battery cell 101 needs to be less than or equal to (not more than) 0.5 millimeter (mm), and the flatness of the plane of the direct contact position of the liquid cooling plate 200 and the battery cell 101 needs to be less than or equal to 0.5 mm.
In another embodiment, the battery device 100 is a battery module 102, and fig. 3 is a schematic structural diagram of a battery heat dissipation system in which the battery module 102 is welded on a surface of a liquid cooling plate 200 according to an embodiment of the present disclosure. As shown in fig. 3, the present application welds the bottom of the case of the battery module 102 and the liquid cooling plate 200 together by means such as a polymer welding process. The bottom flatness of the battery module 102 needs to be less than or equal to (not more than) 0.5 millimeter (mm), and the flatness of the plane at the position where the liquid cooling plate 200 is directly contacted with the battery module 102 needs to be less than or equal to 0.5 mm.
In yet another embodiment, the specific implementation of the battery device 100 mounted on the liquid cooling plate 200 is as follows: a number of pits (also referred to as shallow pits or grooves) are designed on the liquid cooling plate 200 according to the size of the bottom of the battery device 100, and the battery device 100 is correspondingly placed in the pits.
In a specific embodiment, the battery device 100 is a battery cell 101, and please refer to fig. 4 and fig. 5, which are schematic structural diagrams of a battery heat dissipation system in which the battery cell 101 is disposed in a plurality of pits on a surface of a liquid cooling plate 200 according to an embodiment of the present disclosure. As shown in fig. 4, the present application designs the upper layer of the liquid cooling plate 200 into a number of pockets according to the bottom size of each battery cell 101, and further places the battery cells 101 in the pockets as shown in fig. 5. The design of the pits plays a role in fixing the battery cell on one hand; on the other hand, the bottom of the battery cell is more fully contacted with the liquid cooling plate 200, so that a greater cooling effect is exerted. The bottom flatness of the battery cell 101 needs to be less than or equal to (not more than) 0.5 millimeter (mm), and the flatness of the plane of the direct contact position of the liquid cooling plate 200 and the battery cell 101 needs to be less than or equal to 0.5 mm.
In another embodiment, the battery device 100 is a battery module 102, and fig. 5 is a schematic structural diagram of a battery heat dissipation system in which the battery module 102 is disposed in a plurality of pits on a surface of a liquid cooling plate 200 according to an embodiment of the present disclosure. As shown in fig. 6, the present application designs the upper layer of the liquid cooling plate 200 into a number of pockets according to the bottom size of each battery module 102, and places the battery modules 102 in the pockets. The design of the pits plays a role in fixing the battery module on one hand; on the other hand, the bottom of the battery module is more sufficiently in contact with the liquid cooling plate 200, and a greater cooling effect is exerted. The bottom flatness of the battery module 102 needs to be less than or equal to (not more than) 0.5 millimeter (mm), and the flatness of the plane at the position where the liquid cooling plate 200 is directly contacted with the battery module 102 needs to be less than or equal to 0.5 mm.
In yet another embodiment, the specific implementation of the battery device 100 mounted on the liquid cooling plate 200 is as follows: when the bottom of the housing of the battery device 100 is manufactured, a corresponding hollow ring belt is designed, and a corresponding fixing member is additionally designed on the liquid cooling plate 200 to fix the battery device 100 on the liquid cooling plate 200 through the hollow ring belt of the battery device 100.
In an embodiment, the battery device 100 is a battery cell 101, and fig. 7 is a schematic diagram of a hollow annular band machined at a bottom of a casing of the battery cell 101 according to an embodiment of the present disclosure. As shown in fig. 7, when the casing of the battery cell 101 is manufactured, a hollow strip is processed at the bottom of the casing to fix the casing.
In another embodiment, the battery device 100 is a battery module 102, and fig. 8 is a schematic diagram of a hollow ring belt formed at the bottom of the housing of the battery module 102 according to the embodiment of the present disclosure. As shown in fig. 8, in the present application, a hollow strip is formed at the bottom of the case of the battery module 102 when the case is manufactured. Accordingly, a fixing member (for example, a strip-shaped plate in the drawing) is further processed on the liquid cooling plate 200, and the fixing member can just penetrate through the hollow annular band of the housing of the battery cell 101 or the battery module 102, so that the battery cell 101 or the battery module 102 is firmly fixed on the liquid cooling plate 200, and in particular, a hollow strip of the battery device 100 can penetrate through the strip-shaped plate on the liquid cooling plate 200 to fix the battery device 100 as shown in fig. 9.
In an alternative embodiment, in order to solve the problem of excessive temperature difference between the upper portion and the lower portion of the battery device 100 (battery cell or battery module), the present application may attach the heat dissipation panel 300 to any one or more side surfaces of the battery device, where the heat dissipation panel 300 may include, but is not limited to, a metal plate, a phase change material, or other material panels for heat conduction and temperature reduction. The heat dissipation panel 300 is integrated with the liquid cooling plate 200, and can rapidly conduct heat. Thus, the top (upper) heat of the battery device 100 can be transferred through at least three channels: transferring heat from top to bottom through the pole rolls; heat is transferred to the liquid cooling plate 200 through the left side heat dissipation panel of the battery device 100; heat is transferred to the liquid cold plate 200 through the right side heat dissipating panel of the battery device 100.
In an embodiment, the heat dissipation panel 300 is a metal plate, and please refer to fig. 10, which shows a schematic diagram of attaching the metal plate to the left and right sides of the battery electric core 101. Fig. 11 is a schematic view of a battery module 102 with metal plates attached to the left and right sides thereof.
Optionally, in addition to the scheme of attaching the metal plates to the two sides of the battery device 100, phase change materials may be attached to the remaining two sides, and the phase change materials absorb heat to cool the two sides of the battery device 100 by performing phase transition at a certain temperature. When the temperature is reduced, the phase-change material returns to the original state again, and the heat conduction and temperature reduction effects are achieved through the repeated alternation. Thus, the upper part or the lower part of the battery device 100 can be cooled at the same time at the highest speed, and the interface problems of lithium precipitation, side reaction and the like at the lower part of the battery device 100 are avoided.
Through implementing this application, the core thinking of this application is to carry out the integrated design with battery equipment 100 and liquid cooling board 200, through the direct contact heat dissipation between the metal. The scheme has the advantages that the heat dissipation efficiency is improved by 1-2 orders of magnitude, and the method is particularly suitable for working condition scenes such as super rapid charging, high-power discharging and the like. In addition, structural adhesive for fixing the battery equipment 100 can be omitted through integrated design, so that the weight of the whole battery pack can be reduced to a certain extent, the weight energy density of the battery pack is favorably improved, and the mass energy density is improved by 0.5-5%. Finally, through the design of the scheme, the structural strength of the battery pack can be improved to a certain degree, and the capability of dealing with abuse working conditions such as impact and bottom ball impact can be improved.
This application further still increases heat-dissipating panel 300 (like the metal sheet) in at least one side of battery equipment 100, and heat-dissipating panel 300 is the integrated design with liquid-cooled board 200 to increased the heat conduction heat-sinking capability on battery equipment 100 upper portion, reduced the too big problem of bottom temperature and upper portion temperature difference, avoided interface problems such as the appearance of bottom utmost point book lithium of separating, side reaction.
Fig. 12 is a schematic flow chart illustrating a method for dissipating heat from a battery according to an embodiment of the present disclosure. The method shown in fig. 12 is applied to the battery heat dissipation system 10, and is specifically executed by a battery management system of the battery device 100 in the system, and the method includes the following implementation steps:
s121, when a quick charge request signal for the battery equipment is detected, obtaining a charge control parameter of the battery equipment, wherein the charge control parameter at least comprises a charge voltage.
After detecting a fast charging request signal of the battery device 100, the method starts a parameter current adaptation program, collects charging control parameters of the battery device 100, where the charging control parameters at least include a charging voltage, and may further include, but are not limited to, at least one of the following: temperature rise rate, battery internal resistance, or other battery charging influencing parameters, etc.
And S122, judging whether the charging control parameters meet preset current adjustment conditions.
The charging control parameters are analyzed and judged to identify whether the charging current needs to be adjusted currently. If the charging control parameter is judged to meet the preset current adjustment condition, continuing to execute the step S123; otherwise, ending the flow. The electric quantity adjusting condition is a condition set by a system or a user in a self-defined way, for example, the temperature rise rate exceeds the preset temperature rise, such as 0.5 ℃ and the like; the internal resistance of the cell exceeding a predetermined internal resistance, e.g. a set resistance value psi of 1.05 times0。
And S123, when the charging control parameter meets a preset current adjusting condition, recalculating the target charging current of the battery equipment according to the charging control parameter.
After the charging control parameter is determined to meet the preset current adjustment condition, the charging control parameter K and the current charging current I can be determined0The target charging current I ═ f (I) of the new battery device 100 is calculated0,K)。
And S124, adjusting the current charging current of the battery equipment to the target charging current for charging.
And S125, increasing the refrigerating power of the liquid cooling plate to dissipate heat of the battery equipment.
Optionally, after the current charging current of the battery device 100 is adjusted according to the target charging current, the present application may further increase the cooling power of the liquid cooling plate 200, so as to achieve the heat conduction/dissipation function of the battery device 100.
The specific implementation of the battery heat dissipation method is described below by taking charging control parameters as a temperature rise rate and a battery internal resistance respectively as an example. Fig. 13 is a schematic flow chart illustrating another method for dissipating heat from a battery according to an embodiment of the present disclosure. The method as shown in fig. 13 comprises the following implementation steps:
s131, when a quick charge request signal of the battery equipment is detected, acquiring the temperature rise rate and the battery voltage of the battery equipment.
According to the method and the device, when the battery device 100 detects a quick charging request signal for the battery device, the temperature rise rate and the battery voltage of the device are obtained, and meanwhile, a temperature-current adaptation program is started, so that the charging current can be conveniently and adaptively adjusted according to the temperature rise rate and the battery voltage.
S132, judging whether the temperature rise rate exceeds the preset temperature rise or not, and judging whether the battery voltage does not exceed the preset voltage or not.
The preset temperature rise is set by the system in a self-defining mode, for example, 0.5 ℃. The preset voltage can also be a voltage U which is set by a system in a user-defined mode. When the temperature rise rate is judged to exceed (be greater than or equal to) the preset temperature rise and the battery voltage is judged to not exceed (be less than or equal to) the preset voltage U, the method can continue to execute the step S133; otherwise, ending the flow.
S133, recalculating the target charging current of the battery device according to the temperature rise rate η, wherein the calculation formula is specifically I ═ f (I ═ f)0Eta), I is the target charging current, I0The present charging current of the battery device.
And S134, increasing the refrigerating power of the liquid cooling plate to dissipate heat of the battery equipment.
Optionally, when it is determined that the temperature rise rate exceeds the preset temperature rise and the battery voltage does not exceed the preset voltage, the charging current I may be f (I) according to a functional relationship0Eta) to signal the charger to request adjustment of the charging current, optionally further request signal to increase the cooling power of the liquid cooling plate.
And S135, judging whether the temperature rise rate of the battery equipment is smaller than the preset temperature rise or not and whether the battery voltage of the battery equipment does not exceed the preset voltage or not.
If the temperature rise rate of the battery device is less than the preset temperature rise and the battery voltage of the battery device does not exceed the preset voltage, the step S136 may be continuously executed; otherwise, the flow ends.
S136, adjusting the current charging current of the battery equipment according to the preset charging current, wherein the current charging current is specifically adjusted according to a formula "
Comprises the following steps: i ═ I0. In the charging process, the method can circularly execute the steps S132-S136 until the quick charging is finished.
Fig. 14 is a schematic flow chart illustrating another method for dissipating heat from a battery according to an embodiment of the present disclosure. The method as shown in fig. 14 comprises the following implementation steps:
and S141, when the quick charge request signal of the battery equipment is detected, acquiring the battery internal resistance and the battery voltage of the battery equipment.
According to the method and the device, when the battery device 100 detects a fast charging request signal for the battery device, the battery internal resistance and the battery voltage of the device are obtained, and meanwhile, an internal resistance-current adaptation program is started, so that the charging current can be conveniently and adaptively adjusted according to the battery internal resistance and the battery voltage.
S142, judging whether the internal resistance of the battery exceeds the preset internal resistance and judging whether the voltage of the battery does not exceed the preset voltage.
The preset internal resistance is set by the system self-definition, such as 1.05 psi0Etc. wherein ψ0Is a set value of the internal resistance. The preset voltage can also be a voltage U which is set by a system in a user-defined mode. When the internal resistance of the battery is judged to exceed (be greater than or equal to) the preset internal resistance and the voltage of the battery is judged to not exceed (be less than or equal to) the preset voltage U, the step S143 can be continuously executed; otherwise, ending the flow.
S143, recalculating the target charging current I of the battery device according to the battery internal resistance R, wherein the calculation formula is that I is f (I)0R), I is the target charging current, I0The present charging current of the battery device.
And S144, increasing the refrigerating power of the liquid cooling plate to dissipate heat of the battery equipment.
Optionally, when it is determined that the internal resistance of the battery exceeds the preset internal resistance and the voltage of the battery does not exceed the preset voltage, the charging current I may be f (I) according to a functional relationship0And R) sending a signal to the charger to request the adjustment of the charging current, and optionally further sending a request signal to increase the refrigerating power of the liquid cooling plate.
S145, whether the internal resistance of the battery equipment is smaller than the preset internal resistance or not and whether the battery voltage of the battery equipment does not exceed the preset voltage or not are judged.
If the internal resistance of the battery device is smaller than the preset internal resistance and the battery voltage of the battery device does not exceed the preset voltage, the step S146 may be continuously executed; otherwise, the flow ends.
S146, adjusting the current charging current of the battery equipment according to the preset charging current, wherein the current charging current is specifically adjusted according to a formula "
Comprises the following steps: i ═ I0. In the charging process, the method can circularly execute the steps S142-S146 until the quick charging is finished.
Through implementing this application, provide a battery management strategy and liquid cooling board power control strategy to can effectively avoid the local problem of analyzing lithium of battery equipment.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. The battery heat dissipation system is characterized by comprising battery equipment and a liquid cooling plate, wherein the battery equipment is installed on the liquid cooling plate, and heat generated by the battery equipment can be transferred to the liquid cooling plate to be cooled so as to dissipate heat of the battery equipment.
2. The system of claim 1, wherein the battery device comprises a battery cell, or a battery module.
3. The system of claim 1, wherein the battery device is welded to the surface of the liquid-cooled plate using a welding process, wherein the bottom of the battery device has a flatness of no more than 0.5mm, and the flat surface of the battery device that is in contact with the liquid-cooled plate is no more than 0.5 mm.
4. The system of claim 1, wherein a plurality of pits are formed in the liquid cooling plate according to the bottom size of the battery device, and the battery device is arranged in the pits, wherein the bottom flatness of the battery device is not more than 0.5mm, and the flatness of a plane where the battery device is welded with the liquid cooling plate is not more than 0.5 mm.
5. The system of claim 1, wherein a hollow annulus is provided when fabricating the bottom of the housing of the battery device, and corresponding securing members are provided on the liquid cooled panel to secure the battery device to the liquid cooled panel through the hollow annulus of the battery device.
6. The system of claim 1, wherein the battery heat dissipation system further comprises:
and the heat dissipation panel is attached to at least one side face of the battery equipment so as to transfer the top heat of the battery equipment to the liquid cooling plate for cooling.
7. The system of claim 7, wherein the heat sink panel comprises:
a metal plate, and/or a phase change material.
8. A battery heat dissipation method is applied to a battery heat dissipation system comprising a battery device and a liquid cooling plate, and the method comprises the following steps:
when a quick charge request signal aiming at the battery equipment is detected, acquiring a charge control parameter of the battery equipment, wherein the charge control parameter at least comprises a charge voltage;
when the charging control parameter meets a preset current adjustment condition, recalculating a target charging current of the battery equipment according to the charging control parameter;
and adjusting the current charging current of the battery equipment to the target charging current for charging, and increasing the refrigerating power of the liquid cooling plate so as to dissipate the heat of the battery equipment.
9. The method of claim 8, wherein the charge control parameter further comprises a temperature rise rate, and wherein before recalculating the target charge current for the battery device from the charge control parameter, the method further comprises:
judging whether the charging control parameters meet preset current regulation conditions or not, wherein the method specifically comprises the following steps: judging whether the temperature rise rate exceeds a preset temperature rise or not, and judging whether the charging voltage does not exceed a preset voltage or not;
and if the temperature rise rate is judged to exceed the preset temperature rise, and the charging voltage does not exceed the preset voltage, determining that the charging control parameter meets the preset current adjustment condition.
10. The method of claim 8, wherein the charge control parameter further comprises an internal battery resistance, and wherein before recalculating the target charge current for the battery device based on the charge control parameter, the method further comprises:
judging whether the charging control parameters meet preset current regulation conditions or not, wherein the method specifically comprises the following steps: judging whether the internal resistance of the battery exceeds a preset internal resistance or not, and judging whether the charging voltage does not exceed a preset voltage or not;
and if the internal resistance of the battery exceeds the preset internal resistance and the charging voltage does not exceed the preset voltage, determining that the charging control parameter meets the preset current adjustment condition.
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