Battery pack heat balance system based on oil-to-electricity reach stacker

Abstract

The utility model relates to a battery pack heat balancing system based on an oil-to-electricity reach stacker, which belongs to the technical field of battery temperature control and comprises a plurality of square cooling pipelines and side cooling pipelines, the square cooling pipelines are arranged on the periphery of each group of power batteries, and the side cooling pipelines are arranged on two sides of the power batteries. A liquid cooling plate and a plurality of internal pipelines are arranged in each square-frame-shaped cooling pipeline in a matched mode, the square-frame-shaped cooling pipelines are communicated with the side cooling pipelines, the liquid cooling plates and the internal pipelines through pipeline connectors, and the system further comprises a battery management system, a condenser, a heater and a water pump, a plurality of temperature sensors are arranged in each group of power batteries; and the condenser, the heater and the side cooling pipeline are connected in parallel. Intelligent temperature control adjustment and internal and external temperature balance are realized.

Description

Technical Field

[0001] The utility model relates to a battery pack heat balancing system based on an "oil-to-electricity" front crane, belonging to the technical field of battery temperature control. Background Art

[0002] The front loaders of port operation vehicles have been transformed from fuel-driven to electric-driven. However, due to the limitation of the original vehicle body structure, the power battery pack is greatly affected by the ambient temperature. The operating temperature of the power battery is closely related to its performance, life, and safety. Too high a temperature will affect the power of the battery and reduce the safety performance of the battery; too low a temperature will cause the vehicle's power output performance to decay and the cruising range to decrease. In order to ensure that the modified front loaders can always be in the best working state, the battery pack needs to be managed at a constant temperature. Therefore, a battery pack thermal balancing system based on the "oil-to-electric" front loaders is proposed.

[0003] The traditional battery pack liquid cooling system has the following shortcomings:

[0004] 1. The coolant flow direction of the traditional battery pack liquid cooling system is fixed. After passing through a certain distance of the battery pack, the temperature rises, and the cooling effect on the rear half of the battery pack decreases.

[0005] 2. The traditional battery pack liquid cooling system can only reduce the battery temperature, but it is difficult to keep the battery temperature within a certain range.

[0006] The Chinese utility model patent with application number CN201720175933.3 discloses a battery pack temperature control system, including a heating system, a cooling system and a control system. The heating system includes a sub-heating unit connected in parallel, the sub-heating unit includes a relay, an electric heating wire and a heat sink, the electric heating wire is connected to the positive and negative electrodes of the battery pack, the heat sink is fixedly arranged on the electric heating wire, and the relay is arranged on the positive electrode connection line; the cooling system includes a main cooling pipeline and a sub-cooling unit, the sub-cooling unit includes a branch cooling pipeline and a solenoid valve, both ends of the branch cooling pipeline are connected to the main cooling pipeline, the solenoid valve is arranged on the branch cooling pipeline, and the heat sink is also fixedly connected to the pipe wall of the branch cooling pipeline; the control system includes a controller and several temperature sensors, the temperature sensors are all distributed in the battery pack, and the temperature sensors, relays and solenoid valves are all electrically connected to the controller. The structure is complex and is not suitable for battery packs with upper and lower multi-layer structures. Utility Model Content

[0007] The purpose of the utility model is to solve the technical problems of uneven and discontinuous temperature control in the prior art, and to provide a battery pack thermal balancing system that realizes intelligent temperature control and balanced internal and external temperatures through reciprocating circulation of coolant.

[0008] The utility model is realized through the following technical solutions:

[0009] That is, a battery pack heat balancing system based on an "oil-to-electric" front loader, wherein the battery pack is composed of a plurality of upper and lower groups of power batteries, including a plurality of square frame cooling pipes and side cooling pipes, wherein the square frame cooling pipes are arranged on the periphery of each group of power batteries, and the side cooling pipes are arranged on both sides of the power batteries, and each square frame cooling pipe is equipped with a liquid cooling plate and a plurality of internal pipes, and the square frame cooling pipes are connected with the side cooling pipes, the liquid cooling plate, and the internal pipes through pipe interfaces;

[0010] It also includes a battery management system and a condenser, a heater, and a water pump connected in sequence. Each group of power batteries is equipped with multiple temperature sensors. The condenser, the heater, and the side cooling pipeline are connected in parallel.

[0011] The battery management system is electrically connected to the temperature sensor, the heater, and the condenser.

[0012] The coolant can adjust the circulation direction according to the temperature distribution inside the power battery, making the cooling and insulation effects inside the power battery more balanced. The side-by-side pipes inside the power battery achieve balanced temperature control inside the power battery, a mode of cooling first and then temperature control. The battery management system adjusts the coolant temperature through the heater and condenser according to the real-time temperature of the power battery. After analysis and calculation, the battery management system automatically sets the temperature parameters that can neutralize the power battery temperature to 25°C, achieving better temperature control effects.

[0013] Further preferably, the coolant enters the circulation from one end of the side cooling pipeline, flows through the frame-shaped cooling pipeline to cool the periphery of the power battery, and converges and flows out through the side cooling pipeline at the other end of the frame-shaped cooling pipeline.

[0014] Further preferably, the coolant enters the liquid cooling plate and the internal pipeline through the pipeline interface from one end of the side cooling pipeline to cool the battery cells inside the power battery, and converges and flows out together in the side cooling pipeline on the other side of the power battery.

[0015] Further preferably, a plurality of temperature sensors inside the power battery monitor the temperature inside the power battery in real time, and feed the monitoring data back to the battery management system in real time for analysis, and the battery management system adjusts the coolant temperature through a heater or a condenser.

[0016] Further preferably, when the temperature sensor detects that the temperature distribution inside the power battery is uneven, the battery management system automatically switches the flow direction of the coolant inlet and outlet.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] The coolant can adjust the circulation direction according to the temperature distribution inside the power battery, making the cooling and insulation effects inside the power battery more balanced. The side-by-side pipes inside the power battery achieve balanced temperature control inside the power battery, a mode of cooling first and then temperature control. The battery management system adjusts the coolant temperature through the heater and condenser according to the real-time temperature of the power battery. After analysis and calculation, the battery management system automatically sets the temperature parameters that can neutralize the power battery temperature to 25°C, achieving better temperature control effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the utility model, the drawings required for use in the description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a schematic structural diagram of the cooling liquid downstream of a specific implementation method of the utility model.

[0021] Figure 2 It is a structural schematic diagram of the coolant counterflow in a specific implementation mode of the utility model.

[0022] Figure 3 It is a schematic diagram of the structure of the internal pipeline of the power battery according to a specific implementation method of the utility model.

[0023] In the figure: 1. Battery management system; 2. Side cooling pipeline; 3. Pipe interface; 4. Power battery; 5. Liquid cooling plate; 6. Water pump; 7. Heater; 8. Condenser; 9. Temperature sensor; 10. Internal pipeline; 11. Battery unit; 12. Frame cooling pipeline. DETAILED DESCRIPTION

[0024] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings.

[0025] like Figures 1 to 3 A battery pack heat balancing system based on an "oil-to-electric" front loader is shown, wherein the battery pack is composed of a plurality of upper and lower groups of power batteries 4, including a plurality of square frame cooling pipes 12 and side cooling pipes 2, wherein the square frame cooling pipes 12 are arranged on the periphery of each group of power batteries 4, and the side cooling pipes 2 are arranged on both sides of the power batteries 4, and each square frame cooling pipe 12 is equipped with a liquid cooling plate 5 and a plurality of internal pipes 10, and the square frame cooling pipes 12 are connected to the side cooling pipes 2, the liquid cooling plate 5, and the internal pipes 10 through pipe interfaces 3;

[0026] It also includes a battery management system 1 and a condenser 8, a heater 7, and a water pump 6 connected in sequence. A plurality of temperature sensors 9 are provided inside each group of power batteries 4. The condenser 8, the heater 7, and the side cooling pipeline 2 are connected in parallel. The water pump 6 provides a power source for the flow of the coolant. The condenser 8 cools the coolant, and the heater 7 heats the coolant.

[0027] The battery management system 1 is electrically connected to the temperature sensor 9 , the heater 7 , and the condenser 8 .

[0028] The coolant can adjust the circulation direction according to the temperature distribution inside the power battery 4, so that the cooling and heat preservation effects inside the power battery 4 are more balanced. The internal pipeline 10 of the power battery 4 realizes the balanced temperature control inside the power battery 4, and the mode of cooling first and then controlling the temperature. The battery management system 1 adjusts the coolant temperature through the condenser 8 and the heater 7 according to the real-time temperature of the power battery 4 fed back by the temperature sensor 9. After analysis and calculation, the battery management system 1 automatically sets the temperature parameters that can neutralize the power battery temperature to 25°C, and the temperature control effect is better. Among them, the coolant enters the circulation from one end of the side cooling pipeline 2, flows through the square frame cooling pipeline 12 to cool the periphery of the power battery 4, and converges and flows out through the side cooling pipeline 2 at the other end of the square frame cooling pipeline 12;

[0029] The coolant enters the liquid cooling plate 5 and the internal pipeline 10 from one end of the side cooling pipeline 2 through the pipeline interface 3 to cool the battery cells 11 inside the power battery 4, and then converges and flows out from the side cooling pipeline 2 on the other side of the power battery 4;

[0030] The multiple temperature sensors 9 inside the power battery 4 monitor the temperature inside the power battery 4 in real time, and feed the monitoring data back to the battery management system 1 for analysis in real time. The battery management system 1 adjusts the coolant temperature through the heater 7 or the condenser 8;

[0031] The battery management system 1 calculates the required coolant temperature for adjusting the temperature of the power battery 4 to 25°C based on the internal temperature of the power battery 4 and the coolant temperature. The required coolant temperature, the coolant temperature and the internal temperature of the power battery 4 change in real time until the power battery 4 reaches the optimal operating temperature of 25°C.

[0032] When the required coolant temperature is higher than 25°C, the condenser 8 does not work, and the heater 7 heats the coolant to the required temperature; when the required coolant temperature is lower than 25°C, the condenser 8 cools the coolant, and the heater 7 heats the coolant to the required temperature;

[0033] When the temperature sensor 9 detects that the temperature distribution inside the power battery 4 is uneven, the battery management system 1 automatically switches the flow direction of the coolant inlet and outlet.

[0034] Working principle:

[0035] The coolant passes through the power battery 4 and takes away the temperature of the power battery 4. The temperature of the coolant rises. The temperature of the outflowing coolant is A, the temperature of the coolant flowing through the condenser 8 is B, and the temperature of the coolant flowing through the heater 7 is C. The required coolant temperature to adjust the battery temperature to 25°C is D.

[0036] The determination of the temperature value C is divided into two cases. One is to cool down the power battery 4 (that is, the temperature of the power battery 4 drops to 25°C). After the coolant passes through the power battery 4, the temperature A is higher than 25°C. The temperature sensor 9 inside the power battery 4 senses the temperature in real time and feeds it back to the battery management system 1. After the battery management system 1 analyzes and calculates the required coolant temperature value D that can neutralize the temperature of the power battery 4 to 25°C (at this time, the required temperature D should be lower than 25°C), the condenser 8 executes the command to cool the coolant from temperature A to temperature B. Since the cooled temperature is difficult to control, the coolant needs to be heated after cooling. At this time, B < A. Then the coolant reaches the heater 7, and the heater 7 performs secondary adjustment to heat the coolant temperature to the required temperature D, that is, the temperature value C = D > B. The other is to heat up the power battery 4 (make the temperature of the power battery 4 rise to 25°C). After the coolant passes through the power battery 4, the temperature A is lower than 25°C. The temperature sensor 9 inside the power battery 4 senses the temperature in real time and feeds it back to the battery management system 1. After the battery management system 1 analyzes and calculates the required coolant temperature value D that can neutralize the temperature of the power battery 4 to 25°C (at this time, the required temperature D should be higher than 25°C), the condenser 8 does not work, and the temperature B is the temperature A of the coolant flowing out of the power battery 4, that is, B = A. Then the coolant reaches the heater 7, and the heater 7 heats the coolant temperature to D, that is, the temperature value C = D > B, and continues the next cycle.

[0037] The present utility model realizes intelligent temperature control adjustment for the power battery 4, the coolant circulates reciprocally, and the temperature inside and outside the power battery 4 is controlled evenly.

[0038] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. For the same and similar parts among the embodiments, reference can be made to each other.

[0039] The terms "upper", "lower", "outer side", "inner side", etc. in the description, claims and drawings of the present utility model, if any, are used to distinguish the relative relationship in position and do not need to be given a qualitative definition. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of the present utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion.

[0040] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery pack thermal balancing system based on an "oil-to-electric" front loader, wherein the battery pack is composed of a plurality of upper and lower groups of power batteries (4), characterized in that: The invention comprises a plurality of square frame cooling pipelines (12) and side cooling pipelines (2), wherein the square frame cooling pipelines (12) are arranged at the periphery of each group of power batteries (4), and the side cooling pipelines (2) are arranged at both sides of the power batteries (4), and each square frame cooling pipeline (12) is provided with a liquid cooling plate (5) and a plurality of internal pipelines (10), and the square frame cooling pipeline (12) is connected to the side cooling pipelines (2), the liquid cooling plate (5), and the internal pipelines (10) via pipeline interfaces (3); It also includes a battery management system (1) and a condenser (8), a heater (7), and a water pump (6) connected in sequence, wherein a plurality of temperature sensors (9) are provided inside each group of power batteries (4), and the condenser (8), the heater (7), and the side cooling pipeline (2) are connected in parallel; The battery management system (1) is electrically connected to the temperature sensor (9), the heater (7), and the condenser (8).

2. According to claim 1, a battery pack thermal balancing system based on an "oil-to-electric" reach stacker is characterized in that: The coolant enters the circulation from one end of the side cooling pipeline (2), flows through the frame-shaped cooling pipeline (12) to cool the periphery of the power battery (4), and converges at the other end of the frame-shaped cooling pipeline (12) and flows out through the side cooling pipeline (2).

3. According to claim 2, a battery pack thermal balancing system based on an "oil-to-electric" reach stacker is characterized in that: The coolant enters the liquid cooling plate (5) and the internal pipeline (10) from one end of the side cooling pipeline (2) through the pipeline interface (3), cools the battery cells (11) inside the power battery (4), and flows out together at the side cooling pipeline (2) on the other side of the power battery (4).

4. According to claim 1, a battery pack thermal balancing system based on an "oil-to-electric" reach stacker is characterized in that: A plurality of temperature sensors (9) inside the power battery (4) monitor the temperature inside the power battery (4) in real time, and feed the monitoring data back to the battery management system (1) in real time for analysis. The battery management system (1) adjusts the temperature of the coolant through the heater (7) or the condenser (8).

5. According to claim 4, a battery pack thermal balancing system based on an "oil-to-electric" reach stacker is characterized in that: When the temperature sensor (9) detects that the temperature distribution inside the power battery (4) is uneven, the battery management system (1) automatically switches the flow direction of the coolant inlet and outlet.

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