CN115241561A - Cooling method and device for battery system - Google Patents

Cooling method and device for battery system Download PDF

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Publication number
CN115241561A
CN115241561A CN202210678341.9A CN202210678341A CN115241561A CN 115241561 A CN115241561 A CN 115241561A CN 202210678341 A CN202210678341 A CN 202210678341A CN 115241561 A CN115241561 A CN 115241561A
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China
Prior art keywords
cooling
battery
spraying
main body
temperature
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Chinese (zh)
Inventor
陈慧明
姜涛
荣常如
高天一
赵光宇
胡景博
闫晟睿
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FAW Group Corp
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FAW Group Corp
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Priority to CN202210678341.9A priority Critical patent/CN115241561A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/613—Cooling or keeping cold
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/625—Vehicles
    • 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
    • H01M10/635—Control systems based on ambient temperature
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/654—Means for temperature control structurally associated with the cells located inside the innermost case of the cells, e.g. mandrels, electrodes or electrolytes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
    • H01M10/6567—Liquids
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/505—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing comprising a single busbar
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/569—Constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Automation & Control Theory (AREA)
  • Secondary Cells (AREA)

Abstract

The invention relates to a cooling method and a cooling device of a battery system, which are composed of a temperature sampling module, a judging module, an executing module and a spraying module; the temperature sampling modules are arranged at the lug and on the battery cell and respectively monitor the temperature of the lug and the battery cell; the judging module is used for controlling the cooling process of the battery system, and comprises temperature reading, parameter judging and sending an execution signal to control the execution module to execute cooling; the execution module comprises a battery core main body, a pole cooling part, a battery cooling part, a cooling water supply mechanism and a cooling water heat dissipation air conditioner; the battery core tab and the battery core main body are separated to be cooled and controlled, so that the integral cooling of the battery core is ensured; the scheme of arranging the cooling system in the busbar is innovatively provided, different flow channel shapes can be arranged in the busbar to obtain the best cooling effect, cooling liquid in the busbar is simultaneously used as a fixed-point spraying water source when the electric core is out of control due to thermal runaway, the busbar structure is designed to be of a structure with a spraying component, and automatic spraying is performed when the electric core is out of control due to thermal runaway.

Description

Cooling method and device for battery system
Technical Field
The invention belongs to the technical field of chemical batteries, and particularly relates to a cooling method and device for a battery system.
Background
Chemical batteries are the most common portable electric energy carrying mode at present, and particularly with the gradual increase of the capacity and the power demand of the batteries, the thermal safety of the batteries is gradually a main problem to be considered. At present, air cooling or water cooling is mainly adopted as a cooling medium for cooling the battery, the air cooling efficiency is low, and the pure electric vehicle is not suitable for a scene with harsh requirements on capacity and space, so a water cooling mode is mostly adopted. The current common water cooling mode is to lay a water cooling plate at the bottom or the side surface of the battery for cooling, and the condition that the temperature of a lug part of a battery core is uneven with the temperature of the bottom surface often appears when the battery is used, so that the accelerated deterioration of the battery core is caused, the cycle performance of the battery is reduced, and the performance of the battery capacity is influenced.
The prior art discloses a battery pack and a power battery, wherein the battery pack comprises a cooling unit, a battery cell cavity is defined in a housing of the cooling unit, the battery cell cavity is communicated with a fluid inlet and a fluid outlet of the cooling unit, and a socket communicated with the battery cell cavity is further defined in the housing of the cooling unit; and the battery cell is hermetically matched into the battery cell accommodating cavity through the insertion opening and fills the insertion opening, so that the battery cell accommodating cavity is closed, cooling fluid cannot leak when passing through the battery cell accommodating cavity, and the electrode side of the battery cell is positioned outside the cooling unit shell. However, the flow channel is arranged in the battery cell, so that the battery cell can be integrally cooled, but the pole of the battery cell is not cooled, and the problem of overlarge temperature difference in the battery cell still exists.
The prior art also discloses a novel battery thermal management system and an electric automobile, which comprise a battery module, wherein a heat pipe and a cold plate are arranged in the battery module, the heat pipe is fixed on each battery in the battery module, the heat pipe comprises a condensation section and an evaporation section, a cavity is arranged in the cold plate, and a refrigerant is injected into the cavity; the cold plate is arranged at one side close to the condensing section on the heat pipe; at least one of the outer wall of each battery of the battery module and the outer wall of the heat pipe is provided with a heating film layer. However, the cooling is performed by a circulating reaction mode of condensation and evaporation in the heat pipe, the cooling position is still limited to the bottom of the battery cell, the bus bar is not cooled, and the problem of too large temperature difference in the battery cell is not solved.
Disclosure of Invention
The invention aims to provide a cooling method of a battery system and a cooling device of the battery system, which aim at executing a special cooling strategy aiming at a lug part so as to solve the problem of overlarge temperature difference inside a battery core.
The purpose of the invention is realized by the following technical scheme:
a cooling device of a battery system is composed of a temperature sampling module, a judging module, an executing module and a spraying module;
the temperature sampling modules are arranged at the lug and on the battery cell and used for respectively monitoring the temperature of the lug and the battery cell; the judgment module is used for controlling the cooling process of the battery system, and comprises temperature reading, parameter judgment and sending an execution signal to control the execution module to execute cooling; the execution module consists of a cell main body 1, a pole cooling part 2, a battery cooling part 3, a cooling water supply mechanism 5 and a cooling water heat dissipation air conditioner 6; the spraying module comprises a spraying part 4 which uses a water source in the busbar as a spraying water source and cools the battery cell at the upper end of the battery cell;
the battery cooling part 3 is used for cooling the cell main body 1; the pole cooling part 2 is used for cooling the busbar and the battery cell pole; the cooling water supply mechanism 5 respectively injects cooling water into the pole cooling part 2 and the battery cooling part 3, and returns to the cooling water supply mechanism 5 after circulating for a circle, and the water supply amount can be respectively dynamically adjusted; the cooling water supply mechanism 5 is also connected with a cooling water heat dissipation air conditioner 6, circulating water is injected into the cooling water heat dissipation air conditioner 6, and the circulating water flows back to the cooling water supply mechanism 5 after being cooled.
Further, the temperature sampling module is composed of a cooling water temperature sensor, a tab temperature sensor 1-3 and a cell main body temperature sensor 1-4, wherein the cooling water temperature sensor is arranged at a water inlet of a cooling water entering battery system; sampling points of the tab temperature sensors 1-3 are arranged on tabs or busbars outside the battery cell; the battery core main body temperature sensor 1-4 is arranged on the bottom surface, the side surface or the battery core large surface of the battery core main body 1.
Further, the pole cooling part 2 comprises a bus bar main body 2-1, a bus bar welding groove 2-2, a cooling pipe 2-3 and a spraying part 4; the bus bar welding groove 2-2 is arranged on the bus bar main body 2-1 and used for welding the bus bar main body 2-1 and the battery cell pole 1-1.
Furthermore, the cooling pipes 2-3 are made of insulating materials and arranged inside the bus bar main body 2-1, the flow channel design of the cooling pipes is arranged according to the simulation cooling result, and the battery pack cooling liquid cools the bus bar and the battery cell pole through the cooling pipes 2-3.
Further, the cooling pipes 2 to 3 are straight flow passages or s-shaped flow passages.
Further, the cooling water inlet and outlet of the pole cooling part 2 are single inlet and outlet or multi-inlet and multi-outlet, and when the pole cooling part is multi-inlet and multi-outlet, it is necessary to arrange a convex part at the water flow intersection and provide an exhaust structure.
Further, the battery cooling part 3 is disposed on a side surface or a bottom surface of the battery, and a cooling flow channel is provided inside the battery cooling part to cool the battery cell main body 1.
Further, the spraying part 4 comprises a spraying discharge valve 4-1 and a spraying water pipe 4-2, the spraying water pipe 4-2 is made of insulating materials, is connected with the cooling pipe 2-3, and takes water from the inside of the cooling pipe 2-3, and the spraying water pipe 4-2 is connected with the bus bar main body 2-1 of the other pole from the bus bar main body 2-1 of one pole of the battery cell across the explosion-proof valve 1-2; the spraying discharge valve 4-1 is arranged on the spraying water pipe 4-2 and is positioned right above the explosion-proof valve 1-2, and cooling circulating liquid in the spraying water pipe 4-2 can flow out from a melting part and flows into the battery core through the explosion-proof valve 1-2.
Furthermore, the hot melt material is arranged in the direction of the spraying pressure relief valve 4-1 towards the explosion-proof valve, when the spraying pressure relief valve 4-1 is subjected to a temperature higher than a certain temperature, the spraying pressure relief valve 4-1 can be broken, and the temperature of the spraying valve is preferably between 80 and 130 ℃.
A cooling method of a battery system, comprising the steps of:
A. the temperature sampling module is used for acquiring the degrees of a battery pack cooling water temperature sensor, a tab temperature sensor 1-3 and a battery cell main body temperature sensor 1-4, wherein the degrees are T0, T1 and T2 respectively;
B. judging whether T0-T1 is less than or equal to T6 ℃ and T0-T2 is less than or equal to T7 ℃, if not, starting the cooling water heat-dissipation air conditioner 6 to cool the cooling water, wherein T6 is between-5 and 5, and T7 is between-5 and 5;
C. judging whether the temperature T0-T1 is more than or equal to T8 ℃ and the temperature T0-T2 is more than or equal to T9 ℃, if not, maintaining the cooling water refrigeration process; if yes, keeping T0 within +/-T10 ℃ of the temperature, wherein T8 and T9 are between 3 and 30, T10 is between 0 and 45, and T10 can dynamically change along with the values of T1 and T2 according to the battery property;
D. judging whether the temperature T0-T1 is less than or equal to T6 ℃ and the temperature T0-T2 is less than or equal to T7 ℃ is established, if so, reading the degrees T1 and T2 of the tab temperature sensor 1-3 and the cell main body temperature sensor 1-4;
E. judging whether T2 is greater than or equal to T1 ℃ or not; if not, reading T2 and judging again; if true, the battery cooling section 3 is operated; wherein T1 is between 30 and 40, and the water supply amount is dynamically adjusted by the cooling water supply mechanism 5 according to the values of T0, T1 and T2;
F. judging that T2-T1 is less than T4 ℃ and T1 is more than or equal to T5 ℃; if yes, operating the pole cooling system 2; if not, stopping the pole cooling system 2; wherein T4 is between 0 and 8, T5 is between 30 and 50, and the water supply amount is dynamically adjusted by the cooling water supply mechanism 5 according to the values of T0, T1 and T2;
G. judging that T2 is more than or equal to T3 ℃ and less than T2 ℃; if not, continuing to operate the battery cooling part system 3; if true, the battery main body cooling system is ended; wherein t3 and t2 are set to different values according to different battery cores, preferably between 20 and 40;
H. and reading the temperatures of T0, T1 and T2, and repeating the judgment process to realize the real-time monitoring of the cooling program.
Compared with the prior art, the invention has the beneficial effects that:
the battery core tab and the battery core main body are separated to be cooled and controlled, so that the integral cooling of the battery core is ensured; in the implementation process of cooling the bottom or the side of the battery cell, the lug of the battery cell is directly cooled in a manner of arranging a cooling channel in the busbar, so that the overall temperature balance of the battery cell is maintained, and the problem of overlarge temperature difference inside the battery cell is prevented; meanwhile, a weak point is arranged at one side of the busbar towards the explosion-proof valve, and the cooling liquid is released to cool the battery cell by properly controlling the leakage of the weak point when the battery cell is out of control due to heat so as to prevent the battery cell from being further damaged due to the out of control; the invention innovatively provides a scheme for arranging a cooling system in a busbar, provides that different flow channel shapes can be arranged in the busbar to obtain the best cooling effect, provides that cooling liquid in the busbar is simultaneously used as a fixed-point eruption water source when a battery cell is out of control due to thermal runaway, and provides that the busbar structure is designed into a structure with eruption components to automatically spray when a battery cell thermal runaway spray valve is used.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
FIG. 1 is a flow chart illustrating steps of a method for cooling a battery system;
fig. 2 is a schematic diagram of a battery configuration of a cooling method of the battery system;
FIGS. 3 a-3 b are schematic diagrams of two designs of cooling tube flow channels of the cell structure of FIG. 2;
FIG. 4 is a schematic diagram of another battery configuration for a cooling method of the battery system;
fig. 5 is a schematic view of a flow channel design of a battery system.
In the figure, 1, a cell main body 2, a pole cooling part 3, a battery cooling part 4, a spraying part 5, a cooling water supply mechanism 6, a cooling water heat dissipation air conditioner 1-1, a cell pole 1-2, an explosion-proof valve 1-3, a pole ear temperature sensor 1-4, a cell main body temperature sensor 2-1, a busbar main body 2-2, a busbar welding groove 2-3, a cooling pipe 4-1, a spraying discharge valve 4-2 and a spraying water pipe.
Detailed Description
The invention is further illustrated by the following examples:
the present invention will be described in further detail with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
The cooling device of the battery system comprises a temperature sampling module, a judging module, an executing module and a spraying module. The whole cooling of the battery system is realized through the temperature sampling module, the judgment module and the execution module, the flow is regulated according to the temperatures of different batteries and lugs, and the dynamic control of the cooling is realized. Meanwhile, the self-spraying function of the battery cell is realized through the spraying module, and thermal runaway diffusion is prevented.
The temperature sampling module consists of a cooling water temperature sensor, tab temperature sensors 1-3 and a battery cell main body temperature sensor 1-4, wherein the cooling water temperature sensor is arranged at a water inlet of cooling water entering a battery system; sampling points of the tab temperature sensors 1-3 are arranged on tabs or busbars outside the battery cell; the battery core main body temperature sensor 1-4 is arranged on the bottom surface, the side surface or the battery core large surface of the battery core main body 1. According to the invention, the temperature sensors are arranged at the lug and on the battery cell, the temperatures of the two parts of the battery cell are respectively monitored, and a data acquisition basis is made for the temperature uniformity of the two parts.
The judging module is used for controlling the cooling process of the battery system, and comprises temperature reading, parameter judging and sending an execution signal to control the execution module to execute cooling.
The execution module is composed of a battery core main body 1, a pole cooling part 2, a battery cooling part 3, a cooling water supply mechanism 5 and a cooling water heat dissipation air conditioner 6. The pole cooling part 2 comprises a bus bar main body 2-1, a bus bar welding groove 2-2 and a cooling pipe 2-3, wherein the bus bar welding groove 2-2 is arranged on the bus bar main body 2-1 and used for welding the bus bar main body 2-1 and the battery core pole 1-1. The cooling pipes 2-3 are made of insulating materials and arranged inside the bus bar main body 2-1, the flow channel design of the cooling pipes can be arranged according to a simulation cooling result, and battery pack cooling liquid cools the bus bar and the battery cell pole through the cooling pipes 2-3. As shown in fig. 3a and 3b, the cooling pipes 2-3 may be straight flow passages or s-shaped flow passages. According to the invention, the cooling pipelines are arranged in the busbar, the battery cell busbar is cooled by the cooling water supply mechanism, and the temperature of the battery cell is uniform to the maximum extent because the temperature of the pole column rises at the fastest speed in the use process of the battery cell and the pole column is cooled by the busbar.
As shown in fig. 2, the cooling water inlet and outlet of the pole cooling part 2 are a single inlet and outlet; as shown in fig. 4, the cooling water inlet and outlet of the pole cooling part 2 can be a double water inlet and a double water outlet.
The battery cooling part 3 is arranged on the side surface or the bottom surface of the battery, and a cooling flow passage is arranged inside the battery cooling part to cool the battery core main body 1.
The cooling water supply mechanism 5 is respectively connected with the pole cooling part 2 and the battery cooling part 3 through pipelines, cooling water can be respectively injected into the pole cooling part 2 and the battery cooling part 3, the cooling water returns to the cooling water supply mechanism 5 after circulating for one circle, and the water supply amount can be respectively and dynamically adjusted; the cooling water supply mechanism 5 is also connected with a cooling water heat dissipation air conditioner 6, circulating water is injected into the cooling water heat dissipation air conditioner 6, and the circulating water flows back to the cooling water supply mechanism 5 after being cooled.
The spraying module comprises a spraying part 4, the spraying part 4 comprises a spraying discharge valve 4-1 and a spraying water pipe 4-2, the spraying water pipe 4-2 is made of insulating materials and is connected with a cooling pipe 2-3, water is taken from the inside of the cooling pipe 2-3, and the spraying water pipe 4-2 is connected with a bus bar main body 2-1 of one pole of the battery cell from the bus bar main body 2-1 across an explosion-proof valve 1-2. The spraying and discharging valve 4-1 is arranged on the spraying water pipe 4-2 and is positioned right above the explosion-proof valve 1-2. The hot melt material is arranged in the direction of the spraying pressure relief valve 4-1 towards the explosion-proof valve, when the spraying pressure relief valve 4-1 is subjected to the temperature above a certain temperature, the spraying pressure relief valve 4-1 can be broken, and the temperature of the spraying valve is preferably between 80 and 130 ℃.
2 cooling water inlets of utmost point post cooling portion and export also can be when having more water inlets and a lot of delivery port, need arrange the bulge in rivers intersection to set up exhaust structure, be used for the exhaust to block water, prevent to form the cavity, cause intraductal flatulence.
The spraying part 4 comprises the following working steps: when a certain electric core is out of control due to heat, the explosion-proof valve 1-2 sprays the valve, gas inside the electric core is sprayed onto the 4-1 spray pressure release valve, the gas temperature enables hot melt materials at the lower end of the spray pressure release valve 4-1 to be melted, cooling circulation liquid in the spray water pipe 4-2 flows out from the melting part and flows into the electric core through the explosion-proof valve 1-2, the temperature of the electric core is reduced, and the out of control due to heat is out of control.
In the invention, the spraying part 4 is a main innovation point, and a water source in the busbar is used as a spraying water source to directly cool the battery cell at the upper end of the battery cell, so that the cooling of the battery cell pole is realized, and the thermal runaway safety performance of the battery cell can be improved.
The cooling method of the battery system of the invention comprises the following steps:
1. the temperature sampling module collects the degrees of a battery pack cooling water temperature sensor, a tab temperature sensor 1-3 and a battery cell main body temperature sensor 1-4, wherein the degrees are T0, T1 and T2 respectively;
2. judging whether T0-T1 is less than or equal to T6 ℃ and T0-T2 is less than or equal to T7 ℃, if not, starting the cooling water heat-dissipation air conditioner 6 to cool the cooling water, wherein T6 is between-5 and 5, and T7 is between-5 and 5;
3. judging whether the temperature T0-T1 is more than or equal to T8 ℃ and the temperature T0-T2 is more than or equal to T9 ℃, if not, maintaining the cooling water refrigeration process; if yes, keeping T0 within +/-T10 ℃ of the temperature, wherein T8 and T9 are between 3 and 30, T10 is between 0 and 45, and T10 can dynamically change along with the values of T1 and T2 according to the battery property;
4. judging whether the temperature T0-T1 is less than or equal to T6 ℃ and the temperature T0-T2 is less than or equal to T7 ℃ is established, if so, reading the degrees T1 and T2 of the tab temperature sensor 1-3 and the cell main body temperature sensor 1-4;
5. and judging whether the temperature T2 is more than or equal to T1 ℃ or not. If not, reading T2 and judging again; if true, the battery cooling section 3 is operated; wherein T1 is between 30 and 40, and the water supply amount is dynamically adjusted by the cooling water supply mechanism 5 according to the values of T0, T1 and T2;
6. judging that T2-T1 is less than T4 ℃ and T1 is more than or equal to T5 ℃. If so, operating the pole cooling system 2; if the pole column cooling system is not established, the pole column cooling system 2 is stopped; wherein T4 is between 0 and 8, T5 is between 30 and 50, and the water supply amount is dynamically adjusted by the cooling water supply mechanism 5 according to the values of T0, T1 and T2;
7. judging that T2 is more than or equal to T3 ℃ and less than T2 ℃. If not, continuing to operate the battery cooling part system 3; if true, the battery main body cooling system is ended; wherein t3 and t2 are set to different values according to different battery cores, preferably between 20 and 40;
8. and reading the temperatures T0, T1 and T2, and repeating the judgment process to realize the real-time monitoring of the cooling program.
The cooling method of the battery system realizes the closed-loop control of the whole cooling process, and realizes the whole cooling uniformity of the battery core through dynamically reading the temperature on the pole column and the core body of the battery core and regulating different flow rates.
Example 1
As shown in fig. 2, a cooling device of a battery system is composed of a temperature sampling module, a judging module, an executing module and a spraying module.
The temperature sampling module consists of a cooling water temperature sensor, a tab temperature sensor 1-3 and a battery cell main body temperature sensor 1-4; the cooling water temperature sensor is arranged at a water inlet of the cooling water entering the battery system; sampling points of a tab temperature sensor 1-3 are arranged on a tab outside the battery cell; the cell main body temperature sensors 1 to 4 are arranged on the side faces of the cell main body 1.
The judgment module comprises temperature reading, parameter judgment and execution signal sending to control the execution module to execute cooling.
The execution module is composed of a battery core main body 1, a pole cooling part 2, a battery cooling part 3, a cooling water supply mechanism 5 and a cooling water heat dissipation air conditioner 6. The pole cooling part 2 comprises a bus bar main body 2-1, a bus bar welding groove 2-2 and a cooling pipe 2-3. The bus bar welding groove 2-2 is arranged on the bus bar main body 2-1 and used for welding the bus bar main body 2-1 and the battery cell pole 1-1. As shown in fig. 3a, the cooling tube 2-3 is made of an insulating material, is disposed inside the busbar body 2-1, and is a straight flow channel, and the busbar and the cell poles are cooled by the battery pack cooling liquid through the cooling tube 2-3. The cooling water inlet and outlet of the pole cooling part 2 are a single inlet and outlet. The battery cooling part 3 is arranged on the side surface of the battery, and a cooling flow channel is arranged in the battery cooling part to cool the battery core main body 1. The cooling water supply mechanism 5 is respectively connected with the pole cooling part 2 and the battery cooling part 3 through pipelines, cooling water can be respectively injected into the pole cooling part 2 and the battery cooling part 3, the cooling water returns to the cooling water supply mechanism 5 after circulating for one circle, and the water supply amount can be respectively and dynamically adjusted; the cooling water supply mechanism 5 is also connected with a cooling water heat dissipation air conditioner 6, circulating water is injected into the cooling water heat dissipation air conditioner 6, and the circulating water flows back to the cooling water supply mechanism 5 after being cooled.
The spraying module comprises a spraying part 4, the spraying part 4 comprises a spraying discharge valve 4-1 and a spraying water pipe 4-2, and a water source in a busbar is used as a spraying water source to directly cool the battery cell on the upper end of the battery cell. The spray water pipe 4-2 is made of insulating materials, is connected with the cooling pipe 2-3, takes water from the inside of the cooling pipe 2-3, and is connected with the bus bar main body 2-1 of the other pole from the bus bar main body 2-1 of one pole of the battery core across the explosion-proof valve 1-2. The spraying and discharging valve 4-1 is arranged on the spraying water pipe 4-2 and is positioned right above the explosion-proof valve 1-2. And hot melt materials are arranged in the direction of the spraying pressure release valve 4-1 towards the explosion-proof valve. When a certain electric core is out of control due to heat, the explosion-proof valve 1-2 is used for spraying, gas inside the electric core is sprayed onto the spraying pressure release valve 4-1, the gas temperature enables hot melt materials at the lower end of the spraying pressure release valve 4-1 to be melted, cooling circulation liquid in the spraying water pipe 4-2 flows out from the melting position and flows into the electric core through the explosion-proof valve 1-2, the temperature of the electric core is lowered, and the out of control due to heat is out of control.
Example 2
As shown in fig. 2, a cooling device of a battery system is composed of a temperature sampling module, a judging module, an executing module and a spraying module.
The temperature sampling module consists of a cooling water temperature sensor, tab temperature sensors 1-3 and a battery core main body temperature sensor 1-4; the cooling water temperature sensor is arranged at a water inlet of the cooling water entering the battery system; sampling points of a tab temperature sensor 1-3 are arranged on a tab outside the battery cell; the cell main body temperature sensors 1 to 4 are arranged on the side faces of the cell main body 1.
The judgment module comprises temperature reading, parameter judgment and execution signal sending to control the execution module to execute cooling.
The execution module is composed of a battery core main body 1, a pole cooling part 2, a battery cooling part 3, a cooling water supply mechanism 5 and a cooling water heat dissipation air conditioner 6. The pole cooling part 2 comprises a bus bar main body 2-1, a bus bar welding groove 2-2 and a cooling pipe 2-3. The bus bar welding groove 2-2 is arranged on the bus bar main body 2-1 and used for welding the bus bar main body 2-1 and the battery cell pole 1-1. As shown in fig. 3b, the cooling pipe 2-3 is made of an insulating material, is disposed inside the busbar body 2-1 and is an s-shaped channel, and the busbar and the cell poles are cooled by the battery pack cooling liquid through the cooling pipe 2-3. The cooling water inlet and outlet of the pole cooling part 2 are a single inlet and outlet. The battery cooling part 3 is arranged on the side surface of the battery, and a cooling flow channel is arranged in the battery cooling part to cool the battery core main body 1. The cooling water supply mechanism 5 is respectively connected with the pole cooling part 2 and the battery cooling part 3 through pipelines, cooling water can be respectively injected into the pole cooling part 2 and the battery cooling part 3, the cooling water returns to the cooling water supply mechanism 5 after circulating for one circle, and the water supply amount can be respectively and dynamically adjusted; the cooling water supply mechanism 5 is also connected with a cooling water heat dissipation air conditioner 6, circulating water is injected into the cooling water heat dissipation air conditioner 6, and the circulating water flows back to the cooling water supply mechanism 5 after being cooled.
The spraying module comprises a spraying part 4, the spraying part 4 comprises a spraying discharge valve 4-1 and a spraying water pipe 4-2, and a water source in a busbar is used as a spraying water source to directly cool the battery cell on the upper end of the battery cell. The spray water pipe 4-2 is made of an insulating material, is connected with the cooling pipe 2-3, and takes water from the interior of the cooling pipe 2-3, and the spray water pipe 4-2 crosses the explosion-proof valve 1-2 from the bus bar main body 2-1 of one pole of the battery core to be connected with the bus bar main body 2-1 of the other pole. The spraying and discharging valve 4-1 is arranged on the spraying water pipe 4-2 and is positioned right above the explosion-proof valve 1-2. And hot melt materials are arranged in the direction of the spraying pressure release valve 4-1 towards the explosion-proof valve. When a certain electric core is out of control due to heat, the explosion-proof valve 1-2 is used for spraying, gas inside the electric core is sprayed onto the spraying pressure release valve 4-1, the gas temperature enables hot melt materials at the lower end of the spraying pressure release valve 4-1 to be melted, cooling circulation liquid in the spraying water pipe 4-2 flows out from the melting position and flows into the electric core through the explosion-proof valve 1-2, cooling of the electric core is achieved, and out of control due to heat is achieved.
Example 3
As shown in fig. 4, a cooling device of a battery system is composed of a temperature sampling module, a judging module, an executing module and a spraying module.
The temperature sampling module consists of a cooling water temperature sensor, a tab temperature sensor 1-3 and a battery cell main body temperature sensor 1-4; the cooling water temperature sensor is arranged at a water inlet of the cooling water entering the battery system; sampling points of a tab temperature sensor 1-3 are arranged on a tab outside the battery cell; the cell main body temperature sensors 1 to 4 are arranged on the side faces of the cell main body 1.
The judgment module comprises temperature reading, parameter judgment and execution signal sending to control the execution module to execute cooling.
The execution module is composed of a battery core main body 1, a pole cooling part 2, a battery cooling part 3, a cooling water supply mechanism 5 and a cooling water heat dissipation air conditioner 6. The pole cooling part 2 comprises a bus bar main body 2-1, a bus bar welding groove 2-2 and a cooling pipe 2-3. The bus bar welding groove 2-2 is formed in the bus bar main body 2-1 and used for welding the bus bar main body 2-1 and the battery cell pole 1-1. The cooling pipe 2-3 is made of insulating materials and arranged inside the bus bar main body 2-1, the shape of the flow channel is shown in figure 5, and the battery pack cooling liquid cools the bus bar and the battery cell pole through the cooling pipe 2-3. The cooling water inlet and outlet of the pole cooling part 2 are a multi-water inlet and a multi-water outlet. The battery cooling part 3 is arranged on the side surface of the battery, and a cooling flow channel is arranged inside the battery cooling part to cool the battery core main body 1. The cooling water supply mechanism 5 is respectively connected with the pole cooling part 2 and the battery cooling part 3 through pipelines, cooling water can be respectively injected into the pole cooling part 2 and the battery cooling part 3, the cooling water returns to the cooling water supply mechanism 5 after circulating for one circle, and the water supply amount can be respectively and dynamically adjusted; the cooling water supply mechanism 5 is also connected with a cooling water heat dissipation air conditioner 6, circulating water is injected into the cooling water heat dissipation air conditioner 6, and the circulating water flows back to the cooling water supply mechanism 5 after being cooled.
The spraying module comprises a spraying part 4, the spraying part 4 comprises a spraying discharge valve 4-1 and a spraying water pipe 4-2, and a water source in a busbar is used as a spraying water source to directly cool the battery cell at the upper end of the battery cell. The spray water pipe 4-2 is made of insulating materials, is connected with the cooling pipe 2-3, takes water from the inside of the cooling pipe 2-3, and is connected with the bus bar main body 2-1 of the other pole from the bus bar main body 2-1 of one pole of the battery core across the explosion-proof valve 1-2. The spraying and discharging valve 4-1 is arranged on the spraying and discharging pipe 4-2 and is positioned right above the explosion-proof valve 1-2. And hot melt materials are arranged in the direction of the spraying pressure release valve 4-1 towards the explosion-proof valve. The water flow intersection is provided with a convex part, an exhaust structure and an exhaust valve, and the exhaust valve is used for exhausting water and preventing water from flowing out. When a certain electric core is out of control due to heat, the explosion-proof valve 1-2 is used for spraying, gas inside the electric core is sprayed onto the spraying pressure release valve 4-1, the gas temperature enables hot melt materials at the lower end of the spraying pressure release valve 4-1 to be melted, cooling circulation liquid in the spraying water pipe 4-2 flows out from the melting position and flows into the electric core through the explosion-proof valve 1-2, the temperature of the electric core is lowered, and the out of control due to heat is out of control.
Example 4
A cooling method of a battery system, comprising the steps of:
1. the temperature sampling module is used for acquiring the degrees of a battery pack cooling water temperature sensor, a tab temperature sensor 1-3 and a battery cell main body temperature sensor 1-4, wherein the degrees are T0, T1 and T2 respectively;
2. judging that T0-T1 is not more than T6 ℃ and T0-T2 is not more than T7 ℃, starting a cooling water heat-dissipation air conditioner 6, and cooling the cooling water, wherein T6 is-2 and T7 is-3;
3. judging that T0-T1 is less than or equal to T8 ℃ and T0-T2 is less than or equal to T9 ℃, and keeping T0 within +/-T10 ℃ of the temperature, wherein T8 is 8, T9 is 15, T10 is 25, and T10 can dynamically change along with the values of T1 and T2 according to the property of the battery;
4. judging whether the temperature T0-T1 is less than or equal to T6 ℃ and the temperature T0-T2 is less than or equal to T7 ℃ again, and reading the degrees T1 and T2 of the tab temperature sensor 1-3 and the battery cell main body temperature sensor 1-4;
5. judging that T2 is higher than or equal to T1 ℃, and operating a battery cooling part 3; wherein T1 is between 35, the water supply amount is dynamically adjusted by the cooling water supply mechanism 5 according to the values of T0, T1 and T2;
6. if T2-T1 is less than T4 ℃ and T1 is more than or equal to T5 ℃, operating the pole cooling system 2; wherein T4 is 2, T5 is 35, the water supply amount is dynamically adjusted by the 5-cooling water supply mechanism according to the values of T0, T1 and T2;
7. judging whether the temperature T2 is greater than or equal to T3 ℃ and less than T2 ℃ and finishing the cooling system of the battery main body, wherein T3 is 22, and T2 is 38;
8. and reading the temperatures T0, T1 and T2, and repeating the judgment process to realize the real-time monitoring of the cooling program.
It is to be noted that the foregoing description is only exemplary of the invention and that the principles of the technology may be employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in some detail by the above embodiments, the invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the invention, and the scope of the invention is determined by the scope of the appended claims.

Claims (10)

1. A cooling device of a battery system, characterized in that: the device consists of a temperature sampling module, a judging module, an executing module and a spraying module;
the temperature sampling modules are arranged at the lug and on the battery cell and used for respectively monitoring the temperature of the lug and the battery cell; the judgment module is used for controlling the cooling process of the battery system, and comprises temperature reading, parameter judgment and sending of an execution signal to control the execution module to execute cooling; the execution module consists of a cell main body (1), a pole cooling part (2), a battery cooling part (3), a cooling water supply mechanism 5 and a cooling water heat dissipation air conditioner (6); the spraying module comprises a spraying part (4) which uses a water source in the busbar as a spraying water source and cools the battery cell at the upper end of the battery cell;
the battery cooling part (3) is used for cooling the battery core main body (1); the pole cooling part 2 is used for cooling the busbar and the battery cell pole; the cooling water supply mechanism (5) respectively injects cooling water into the pole cooling part (2) and the battery cooling part (3), and returns to the cooling water supply mechanism (5) after circulating for a circle, and the water supply amount can be dynamically adjusted; the cooling water supply mechanism 5 is also connected with a cooling water heat dissipation air conditioner (6), circulating water is injected into the cooling water heat dissipation air conditioner (6), and the circulating water flows back to the cooling water supply mechanism (5) after being cooled.
2. A cooling apparatus of a battery system according to claim 1, characterized in that: the temperature sampling module consists of a cooling water temperature sensor, a lug temperature sensor (1-3) and a battery cell main body temperature sensor (1-4), wherein the cooling water temperature sensor is arranged at a water inlet of cooling water entering a battery system; the sampling points of the lug temperature sensors (1-3) are arranged on lugs outside the battery cell or a bus bar; the battery cell main body temperature sensor (1-4) is arranged on the bottom surface, the side surface or the battery cell large surface of the battery cell main body (1).
3. A cooling apparatus of a battery system according to claim 1, wherein: the pole cooling part (2) comprises a busbar main body (2-1), a busbar welding groove (2-2) and a cooling pipe (2-3); the bus bar welding groove (2-2) is formed in the bus bar main body (2-1) and used for welding the bus bar main body (2-1) and the battery cell pole column (1-1).
4. A cooling apparatus of a battery system according to claim 3, characterized in that: the cooling pipe (2-3) is made of insulating materials and arranged inside the busbar main body (2-1), the flow channel design of the cooling pipe is arranged according to a simulation cooling result, and the busbar and the battery cell pole are cooled by cooling liquid of the battery pack through the cooling pipe (2-3).
5. The cooling device for a battery system according to claim 4, wherein: the cooling pipes (2-3) are straight flow passages or s-shaped flow passages.
6. A cooling apparatus of a battery system according to claim 1, characterized in that: utmost point post cooling portion (2) cooling water entry and export are single entry and export or for many water inlets and many water outlets, need arrange the bulge in rivers intersection to set up exhaust structure.
7. A cooling apparatus of a battery system according to claim 1, characterized in that: the battery cooling part (3) is arranged on the side surface or the bottom surface of the battery, and a cooling flow channel is arranged inside the battery cooling part to cool the battery core main body (1).
8. A cooling apparatus of a battery system according to claim 1, characterized in that: the spraying part 4 comprises a spraying discharge valve (4-1) and a spraying water pipe (4-2), the spraying water pipe (4-2) is made of insulating materials, is connected with the cooling pipe (2-3), takes water from the inside of the cooling pipe (2-3), and the spraying water pipe (4-2) crosses the explosion-proof valve (1-2) from the bus bar main body (2-1) of one pole of the battery core to be connected with the bus bar main body (2-1) of the other pole; the spraying discharge valve (4-1) is arranged on the spraying water pipe (4-2) and is positioned right above the explosion-proof valve (1-2), and cooling circulating liquid in the spraying water pipe (4-2) can flow out from a melting position and flows into the battery core through the explosion-proof valve (1-2).
9. A cooling apparatus of a battery system according to claim 1, characterized in that: the hot melt material is arranged in the direction of the spraying pressure relief valve (4-1) towards the explosion-proof valve, when the spraying pressure relief valve (4-1) is subjected to a temperature higher than a certain temperature, the spraying pressure relief valve (4-1) can be broken, and the temperature of the spraying valve is preferably between 80 and 130 ℃.
10. A cooling method of a battery system, comprising the steps of:
A. the temperature sampling module is used for acquiring degrees of a battery pack cooling water temperature sensor, a tab temperature sensor (1-3) and a battery cell main body temperature sensor (1-4), wherein the degrees are T0, T1 and T2 respectively;
B. judging whether T0-T1 is less than or equal to T6 ℃ and T0-T2 is less than or equal to T7 ℃, if not, starting a cooling water heat-dissipation air conditioner (6) to cool the cooling water, wherein T6 is between-5 and 5, and T7 is between-5 and 5;
C. judging whether the temperature T0-T1 is less than or equal to T8 ℃ and the temperature T0-T2 is less than or equal to T9 ℃, if not, maintaining the cooling water refrigeration process; if yes, keeping T0 within +/-T10 ℃ of the temperature, wherein T8 and T9 are between 3 and 30, T10 is between 0 and 45, and T10 can dynamically change along with the values of T1 and T2 according to the battery property;
D. judging whether T0-T1 is more than or equal to T6 ℃ and T0-T2 is more than or equal to T7 ℃ or not, if so, reading the degrees T1 and T2 of the lug temperature sensor (1-3) and the battery cell main body temperature sensor (1-4);
E. and judging whether T2 is more than or equal to T1 ℃ or not. If not, reading T2 and judging again; if yes, operating the battery cooling part (3); wherein T1 is between 30 and 40, and the water supply amount is dynamically adjusted by a cooling water supply mechanism (5) according to the values of T0, T1 and T2;
F. judging that T2-T1 is less than T4 ℃ and T1 is more than or equal to T5 ℃. If yes, operating the pole cooling system (2); if the pole is not established, the pole cooling system (2) is stopped; wherein T4 is between 0 and 8, T5 is between 30 and 50, and the water supply amount is dynamically adjusted by a cooling water supply mechanism (5) according to the values of T0, T1 and T2;
G. judging that T2 is more than or equal to T3 ℃ and less than T2 ℃; if not, continuing to operate the battery cooling part system 3; if true, the battery main body cooling system is ended; wherein t3 and t2 are set to different values according to different battery cores, preferably between 20 and 40;
H. and reading the temperatures of T0, T1 and T2, and repeating the judgment process to realize the real-time monitoring of the cooling program.
CN202210678341.9A 2022-06-13 2022-06-13 Cooling method and device for battery system Pending CN115241561A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116131047A (en) * 2023-04-04 2023-05-16 武汉嘉晨电子技术有限公司 Automobile BDU electric connector, automobile BDU and BDU heat dissipation method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116131047A (en) * 2023-04-04 2023-05-16 武汉嘉晨电子技术有限公司 Automobile BDU electric connector, automobile BDU and BDU heat dissipation method
CN116131047B (en) * 2023-04-04 2023-09-15 武汉嘉晨电子技术有限公司 Automobile BDU electric connector, automobile BDU and BDU heat dissipation method

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