CN106025142B - A kind of electrokinetic cell system and its control method based on heat conductive silica gel - Google Patents

Abstract

The invention relates to a power battery system based on heat-conducting silica gel and a control method thereof. The power battery system based on heat-conducting silica gel includes a plurality of modules and a cooling system. When the power battery module is in the working state and the overall temperature of the external discharge continues to rise, the battery is surrounded by thermal silica gel, which has higher heat transfer efficiency and better overall thermal balance; when the power battery works under high load, due to the use of The heat-conducting silica gel and water-cooled plate are used, and the temperature is relatively low. Compared with the existing power battery module, the service life of the battery is prolonged and the working stability of the power battery module is guaranteed.

Description

A power battery system based on thermally conductive silica gel and its control method

technical field

The invention relates to the field of new energy vehicles, in particular to a heat dissipation and control method for a power battery system based on heat-conducting silica gel.

Background technique

New energy electric vehicles refer to vehicles powered by on-board power supplies and driven by motors. Since new energy electric vehicles are powered by electricity and have little impact on the environment, their prospects are widely optimistic, and they also meet the requirements of new energy strategies. However, as a new research direction of new energy vehicles, there are many technical difficulties that need to be overcome, not only in terms of structure, but also in the management of electronic, electrical and software systems. In addition, there are many technical difficulties, especially in the key part of new energy vehicles - the battery. Because new energy electric vehicles are powered by electricity, the performance of batteries and battery management systems directly affect the performance of new energy electric vehicles. At present, the batteries used in new energy vehicles include lead-acid batteries, lithium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries and sodium-sulfur batteries, etc., and these batteries have their own advantages but also have many disadvantages. Driving a new energy electric vehicle for a long time will inevitably lead to a rise in battery temperature, which will lead to a decrease in battery performance, thereby reducing the performance of the new energy electric vehicle. It is not enough if only the performance of the battery is up to standard without being equipped with an excellent battery management system. An excellent battery management system can timely and accurately reflect the status of the battery to the technicians. Through this information, the technicians can make accurate decisions. Operate to control new energy vehicles, such as controlling the rotation speed of the motor, vehicle speed and whether to continue driving, etc. And the excellent battery management system enables the car to recover the kinetic energy when going downhill very conveniently so as to achieve the purpose of energy saving. It can keep the battery in a good working condition without overcharging or overdischarging, prolong its service life and reduce costs. The working status of multiple power sources can be adjusted in time, so that the whole is in a coordinated state, and the service life of the whole vehicle can be extended. However, an excellent battery management system not only requires excellent programming, but also needs excellent hardware to support it. However, these are technical difficulties at present.

In the future, electric vehicles will inevitably become a widely used means of transportation, so it is extremely meaningful to strive to improve the heat dissipation design of the battery. The structural layout and material selection of heat dissipation need to be carefully designed. Invention patent CN201620079215.1 proposes a power battery module. The shortcomings of this invention patent are: 1) In order to dissipate heat from the power battery module, at least one heat dissipation pipe is provided on the side of the power battery, and the heat dissipation of the heat dissipation pipe This design structure is not compact enough, which will lead to a larger volume of the power battery module; 2) The structure of the heat dissipation pipe is not strong enough, and the bumps generated during the normal operation of the car will cause the heat dissipation pipe to loosen and fail .

Contents of the invention

Aiming at the deficiencies of the above-mentioned prior art, the problems solved by the present invention are: when the existing power battery module works, the heat distribution is unbalanced, the heat dissipation efficiency is low, and automatic monitoring cannot be performed.

In order to solve the above problems, the technical scheme that the present invention takes is as follows:

A power battery system based on heat-conducting silica gel, including a plurality of modules and a cooling system; the module includes a battery pack and an installation box for installing the battery pack; The junction is fixed in a rectangular structure; both sides and the bottom of the battery pack are bonded with thermally conductive silica gel; the thermally conductive silica gel between the plurality of battery cells is connected to the thermally conductive silica gel on both sides and the bottom of the battery pack; The cooling system includes a plurality of water cooling plates, water pumps, and water tanks; the water cooling plates are provided with water inlet pipes and water outlet pipes; the water cooling plates are fixed to the heat-conducting silica gel at the bottom of each battery pack; the water tanks and water pumps connection; the water pump connects multiple water-cooled plates to the water tank in series through the cooling water pipe.

Further, the two ends of the battery pack are clamped and fixed in the installation box by the baffle.

Further, it also includes a high-voltage control system; the high-voltage control system includes multiple pairs of positive and negative high-voltage connectors and a high-voltage distribution cabinet; each module is equipped with a pair of positive and negative high-voltage connectors; In the high-voltage power distribution cabinet, the positive and negative high-voltage connectors on multiple modules are connected in series through high-voltage wires.

Further, it also includes a radiator; the radiator is respectively connected with the water tank and the high-voltage distribution cabinet.

Further, it also includes a battery management system; the battery management system includes a plurality of low-voltage connectors, a plurality of slave control boards, a plurality of flow controllers, a plurality of flow sensors, a plurality of temperature sensors, and a main control board; the The low-voltage connector is connected to the slave control board; the low-voltage connector and the slave control board are installed on the module; the flow controller and flow sensor are installed on the water inlet pipe of the water-cooled plate; the temperature sensor is installed On the outlet pipe of the water-cooled plate; the low-voltage connectors on the multiple modules are connected sequentially through low-voltage lines and are not connected end to end, one end is the head module, and the other end is the end module; the head module The low-voltage connector on the terminal module is connected to the main control board through a low-voltage line, and the low-voltage connector on the end module is disconnected from the main control board; the main control board is connected to the water pump through a low-voltage line to control the opening of the water pump.

Further, the slave control board is connected to the battery pack through metal connectors.

Further, the metal connector is a sheet metal and a conductive post; the sheet metal is fixed on the inner wall of the installation box; the lower end of the conductive post is connected to the battery pack; the lower side of the slave control board is fixed on the conductive post On, the upper side is fixed on the sheet metal.

A control method for a power battery system based on thermally conductive silica gel according to claim 5, comprising the following steps:

(1) Signal collection: the slave control board on each module collects water flow and temperature signals through flow sensors and temperature sensors;

(2) Signal transmission: The flow and temperature signals are transmitted from the slave control board on the end module to the slave control board on the adjacent module through the low-voltage connector and low-voltage line, and transmitted in turn until the flow rate on each module Both the flow and temperature signals reach the slave control board of the head-end module, and then the slave control board of the head-end module transmits the flow and temperature signals on each module to the main control board;

(3) Signal processing: The main control board compares the temperature of each module, and selects the highest temperature among multiple modules as the comparison temperature;

(4) Signal comparison adjustment: When the comparison temperature is less than or equal to the minimum temperature standard, the main control board controls the water pump to continue to maintain the original opening degree through the low-pressure line; when the comparison temperature is between the minimum temperature standard and the maximum temperature standard, As the contrast temperature gradually rises, the main control board controls the water pump to gradually increase the opening through the low-voltage line to increase the inflow flow; Maximum water flow to work.

Beneficial effects of the present invention

1. The battery pack of the present invention is made of a plurality of battery cells bonded and fixed by heat-conducting silica gel to form a rectangular structure. Both sides and the bottom of the battery pack are bonded with heat-conducting silica gel. The heat-conducting silica gel between the multiple battery cells and the The heat-conducting silica gel on both sides and the bottom is connected. When the module is discharging and working, the temperature of the battery cell in the middle rises the fastest and has the highest temperature. On the battery cell, so as to balance the overall heat. The cooling system of the present invention includes a plurality of water cooling plates, water pumps, and water tanks. The water cooling plates are provided with water inlet pipes and water outlet pipes. The water cooling plates are fixed to the heat-conducting silica gel at the bottom of each battery pack. The water tanks are connected to the water pumps. The two water-cooled plates are connected in series to the water tank in sequence, and the heat dissipation and cooling of the heat-conducting silica gel are accelerated through the cold water plate, which improves the heat dissipation efficiency and speed, prolongs the service life of the battery and ensures the working stability of the power battery module.

2. The battery management system of the present invention can monitor the temperature and flow of each module, control the opening of the water pump through the comparison of the temperature, monitor the temperature in real time, and have higher heat dissipation efficiency, realize automatic real-time monitoring, and extend the battery life. service life and ensure the working stability of the power battery module.

Description of drawings

Fig. 1 is a schematic diagram of the three-dimensional structure of the module of the present invention.

Fig. 2 is a top view of the module of the present invention.

Fig. 3 is a bottom view of the module of the present invention.

Fig. 4 is a schematic diagram of the structure of the water-cooled plate of the present invention.

Fig. 5 is a schematic diagram of the overall connection of the present invention.

In the figure: 1—box cover, 2—box body, 3—through hole of cooling water outlet pipe, 4—water outlet pipe, 5—water inlet pipe, 6—through hole of cooling water inlet pipe, 7—high voltage connector, 8—low pressure Connector, 9—bolt, 10—baffle, 11—battery unit, 12—middle thermal silica layer, 13—side thermal silica layer, 14—sheet metal, 15—slave control board, 16—nut, 17— Thermal silicone layer at the bottom, 18—water cooling plate, 19—flow controller, 20—flow sensor, 21—temperature sensor, 22—main control board, 23—low voltage line, 24—water pump, 25—high pressure line, 26—cooling water pipe, 27—module one, 28—module two, 29—module three, 30—module four, 31—water tank, 32—radiator, 33—high voltage power distribution cabinet, battery pack—51.

Detailed ways

The content of the present invention will be further described in detail below in conjunction with the accompanying drawings.

As shown in Figures 1 and 5, a power battery system based on thermally conductive silica gel includes multiple modules and a cooling system. In this embodiment, four modules are selected for connection and assembly, namely module one 27 , module two 28 , module three 29 , and module four 30 . The module includes a battery pack 51 and an installation box for installing the battery pack 51 . The installation box is made of box body 2 and box cover 1, and box cover 1 can be fixed on the box body 2 by bolt 9. As shown in Figures 2 and 3, the battery pack 51 is formed of a rectangular structure composed of a plurality of battery cells 11 bonded and fixed through heat-conducting silica gel, specifically: a plurality of battery cells 11 are bonded through an intermediate layer of heat-conducting silica gel 12, namely The space between every two battery cells 11 is filled with heat-conducting silica gel. Both sides and the bottom of the battery pack 51 are bonded with thermally conductive silica gel, specifically: the battery pack 51 is provided with side thermally conductive silica gel layers 13 , and the bottom is provided with bottom thermally conductive silica gel layers 17 . The heat-conducting silica gel between the plurality of battery cells 11 is connected to the heat-conducting silica gel on both sides and the bottom of the battery pack 51, that is to say, the middle heat-conducting silica gel layer 12, the side heat-conducting silica gel layer 13, and the bottom heat-conducting silica gel layer 17 are all connected. connected. As shown in FIGS. 3 , 4 , and 5 , the cooling system includes a plurality of water cooling plates 18 , a water pump 24 , and a water tank 31 . As shown in FIGS. 1 and 4 , the water cooling plate 18 is provided with a water inlet pipe 5 and a water outlet pipe 4 . The water outlet pipe 4 is inserted into the water cooling plate 18 through the through hole 3 of the cooling water outlet pipe, and the water inlet pipe 5 is inserted into the water cooling plate 18 through the through hole 6 of the cooling water inlet pipe. As shown in FIG. 3 , the water cooling plate 18 is fixed to the thermally conductive silica gel at the bottom of each battery pack 51 , that is, the bottom thermally conductive silica gel layer 17 . As shown in FIG. 5 , the water tank 31 is connected to the water pump 24 . The water pump 24 connects the water cooling plates 18 on the first module 27 , the second module 28 , the third module 29 , and the fourth module 30 to the water tank 31 in series through the cooling water pipe 26 . Specifically: the water pump 24 is connected to the water inlet pipe 5 of the module one 27 through the cooling water pipe 26; The cooling water pipe 26 is connected to the water inlet pipe 5 of the module three 29, the water outlet pipe 4 of the module three 29 is connected to the water inlet pipe 5 of the module four 30 through the cooling water pipe 26, and the water outlet pipe 4 of the module four 30 is passed through the cooling water pipe 26 Connect with water tank 31. As shown in FIG. 3 , further preferably, both ends of the battery pack 51 are clamped and fixed in the installation box by the baffle 10 , and the baffle 10 is fixed inside the box by the bolt 9 and the nut 16 .

As shown in Figures 1 and 5, further preferably, the present invention also includes a high pressure control system. The high voltage control system includes multiple pairs of positive and negative high voltage connectors 7 and a high voltage distribution cabinet 33 . A pair of positive and negative high-voltage connectors 7 are installed on each of the modules. The high-voltage power distribution cabinet 33 connects the positive and negative high-voltage connectors 7 on the positive and negative poles of the module 1 27 , module 2 28 , module 3 29 , and module 4 30 in series through the high-voltage line 25 . Further preferably, as shown in FIG. 5 , a radiator 32 is also included. The radiator 32 is respectively connected with the water tank 31 and the high voltage distribution cabinet 33 to cool down the water tank 31 and the high voltage distribution cabinet 33 .

As shown in Figures 1, 2, 4, and 5, further preferably, a battery management system is also included. The battery management system includes a plurality of low-voltage connectors 8 , a plurality of slave control boards 15 , a plurality of flow controllers 19 , a plurality of flow sensors 20 , a plurality of temperature sensors 21 , and a main control board 22 . As shown in FIG. 2 , the low-voltage connector 8 is connected to the slave control board 15 . The low-voltage connector 8 and the slave control board 15 are installed on the module. As shown in FIG. 4 , the flow controller 19 and the flow sensor 20 are installed on the water inlet pipe 5 of the water cooling plate 18 . The temperature sensor 21 is installed on the water outlet pipe 4 of the water cooling plate 18 . As shown in Figure 5, among the multiple modules described, the low-voltage connectors 8 of module one 27, module two 28, module three 29, and module four 30 are selected in this embodiment to be sequentially connected by low-voltage lines 23 and end to end Not connected, one end is the head module, the head module is module one 27; the other end is the end module, the end module is module four 30. The low-voltage connector 8 on the first module 27 is connected to the main control board 22 through the low-voltage line 23, and the low-voltage connector 8 on the fourth module 30 is disconnected from the main control board 22. The main control board 22 is connected to the water pump 24 through the low pressure line 23 to control the opening of the water pump 24 . As shown in FIG. 2 , further preferably, the slave control board 15 is connected to the battery pack 51 through metal connectors. Further preferably, the metal connectors are sheet metal 14 and conductive posts. Described sheet metal 14 is fixed on the installation box inner wall. The lower ends of the conductive posts are connected to the battery pack 51 . The lower side of the slave control board 15 is fixed on the conductive column, and the upper side is fixed on the sheet metal 14 .

A control method for a power battery system based on heat-conducting silica gel, including the following steps: (1) Signal acquisition: each module is module one 27, module two 28, module three 29, and module The slave control board 15 on the group four 30 collects the flow and temperature signals of water through the flow sensor 20 and the temperature sensor 21 . (2) Signal transmission: The flow and temperature signals are transmitted from the terminal module, that is, the slave control board 15 on module 1 27 to the slave control board on the adjacent module through the low-voltage connector 8 and the low-voltage line 23, and in turn Transfer until the flow and temperature signals on each module reach the slave control board of the head-end module, in this embodiment: module four 30 transmits the temperature and flow signals on it to module three 29 Then the temperature and flow signal of module three 29 and the temperature and flow signal of module four 30 are sent to module two 28, and so on until module one 27, module two 28, module three 29, The temperature flow signal on the module four 30 has all arrived on the slave control board 15 of the module one 27. Then the slave control board 15 of module one 27 transmits the flow and temperature signals on each module to the main control board 22 . (3) Signal processing: the main control board 22 compares the temperature of each module, and selects the highest temperature among multiple modules as the comparison temperature. (4) Signal comparison adjustment: when the comparison temperature is less than or equal to the minimum temperature standard, the main control board 22 controls the water pump 24 to continue to maintain the original opening through the low-voltage line 23; when the comparison temperature is between the minimum temperature standard and the maximum temperature standard Over time, as the contrast temperature gradually rises, the main control board 22 controls the opening of the water pump 24 to gradually increase the opening through the low-voltage line 23 to increase the inflow flow; Control the water pump 24 to maintain the maximum opening and work with the maximum water flow.

The battery pack 51 of the present invention is composed of a plurality of battery cells 11 bonded and fixed by heat-conducting silica gel to form a rectangular structure. Both sides and the bottom of the battery pack 51 are bonded with heat-conducting silica gel. Both sides of the group and the thermally conductive silica gel at the bottom are connected. When the module discharges and works, the temperature of the battery cell in the middle rises the fastest and has the highest temperature. Low battery cells, so that the overall heat balance. The cooling system of the present invention includes a plurality of water cooling plates 18, water pumps 24, and water tanks 31. The water cooling plates 18 are provided with water inlet pipes 5 and water outlet pipes 4. The water cooling plates 18 and the heat-conducting silica gel at the bottom of each battery pack 51 are fixed, and the water tanks 31 and The water pump 24 is connected, and the water pump 24 connects multiple water-cooled plates 18 to the water tank in series through the cooling water pipe 26, and accelerates the heat dissipation and cooling of the heat-conducting silica gel through the cold water plate 18, which improves the heat dissipation efficiency and speed, prolongs the service life of the battery and ensures power. The working stability of the battery module. The battery management system of the present invention can monitor the temperature and flow of each module, control the opening of the water pump through temperature comparison, monitor the temperature in real time, and have higher heat dissipation efficiency, realize automatic real-time monitoring, and prolong the use of the battery Life and ensure the working stability of the power battery module.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims (4)

1. A power battery system based on heat-conducting silica gel, including a plurality of modules, a cooling system and a battery management system; the module includes a battery pack and an installation box for installing the battery pack; the two ends of the battery pack pass through The baffle is clamped and fixed in the installation box; the cooling system includes multiple water cooling plates, water pumps, and water tanks; the water cooling plate is provided with water inlet pipes and water outlet pipes; the water cooling plate and the bottom of each battery pack The heat-conducting silica gel is fixed; the water tank is connected to the water pump; the water pump connects multiple water-cooled plates to the water tank in series through the cooling water pipe; The power battery system based on heat-conducting silica gel also includes a high-voltage control system; the high-voltage control system includes multiple pairs of positive and negative high-voltage connectors and a high-voltage power distribution cabinet; a pair of positive and negative terminals are installed on the module. Negative high-voltage connectors; the high-voltage power distribution cabinet is connected in series with positive and negative high-voltage connectors on multiple modules through high-voltage wires; The power battery system based on heat-conducting silica gel also includes a radiator; the radiator is respectively connected to the water tank and the high-voltage power distribution cabinet; It is characterized in that it includes a plurality of modules, a cooling system and a battery management system; the battery pack consists of multiple battery cells bonded and fixed by heat-conducting silica gel to form a rectangular structure; both sides and the bottom of the battery pack are glued heat-conducting silica gel; the heat-conducting silica gel between the plurality of battery cells is connected to the heat-conducting silica gel on both sides and the bottom of the battery pack; the battery management system includes a plurality of low-voltage connectors, a plurality of slave control boards, A plurality of flow controllers, a plurality of flow sensors, a plurality of temperature sensors, and a main control board; the low-voltage connector is connected to the slave control board; the low-voltage connector and the slave control board are installed on the module; the The flow controller and flow sensor described above are installed on the water inlet pipe of the water-cooled plate; the temperature sensor is installed on the water outlet pipe of the water-cooled plate; Not connected, one end is the head-end module, and the other end is the end module; the low-voltage connector on the head-end module is connected to the main control board through a low-voltage line, and the low-voltage connector on the end module is connected to the main control board. The board is disconnected; the main control board is connected to the water pump through the low-voltage line to control the opening of the water pump. 2. The power battery system based on thermally conductive silica gel according to claim 1, wherein the slave control board is connected to the battery pack through a metal connector. 3. The power battery system based on thermally conductive silica gel according to claim 2, characterized in that, the metal connectors are sheet metal and conductive posts; the sheet metal is fixed on the inner wall of the installation box; the conductive The lower end of the column is connected to the battery pack; the lower side of the slave control board is fixed on the conductive column, and the upper side is fixed on the sheet metal. 4. A control method for a power battery system based on thermally conductive silica gel according to claim 1, characterized in that, comprising the following steps: (1) Signal collection: the slave control board on each module collects water flow and temperature signals through flow sensors and temperature sensors; (2) Signal transmission: The flow and temperature signals are transmitted from the slave control board on the end module to the slave control board on the adjacent module through low-voltage connectors and low-voltage lines, and transmitted in turn until the flow rate on each module Both the flow and temperature signals reach the slave control board of the head-end module, and then the slave control board of the head-end module transmits the flow and temperature signals on each module to the main control board; (3) Signal processing: the main control board compares the temperature of each module, and selects the highest temperature among multiple modules as the comparison temperature; (4) Signal comparison adjustment: When the comparison temperature is less than or equal to the minimum temperature standard, the main control board controls the water pump through the low-voltage line to continue to maintain the original opening; when the comparison temperature is between the minimum temperature standard and the maximum temperature standard, As the contrast temperature gradually rises, the main control board controls the water pump to gradually increase the opening through the low-voltage line to increase the inflow flow; Maximum water flow to work.