Liquid-cooled energy storage battery using heat pump for heat management

Abstract

The utility model discloses a liquid-cooled energy storage battery using a heat pump for thermal management, which comprises a liquid-cooled battery used for radiating and heating a battery module and a DCDC module in a liquid cooling manner; the heat pump host comprises a heat pump plate heat exchanger, a heat pump loop water pump and a heat pump loop three-way valve, and is used for refrigerating and heating the system and guiding cold and heat out to the buffer water tank; the buffer water tank is connected with the heat pump main machine through a buffer water tank heat exchange coil pipe and is used for storing cold water or hot water led out by the heat pump; and meanwhile, the buffer water tank is connected with the liquid-cooled battery through a buffer water tank loop water pump and a liquid-cooled battery loop electromagnetic valve to provide cold and hot water for the liquid-cooled battery. The buffer water tank is introduced as a middle connecting device, and heating or heat dissipation is provided for the battery by utilizing the water storage characteristic of the buffer water tank. Through indirect connection, frequent start and stop of the heat pump are avoided, the load of the compressor is effectively relieved, the system operation efficiency is improved, and the service life of the heat pump is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of battery, especially utilize a kind of liquid cooling energy storage battery to carry out heat management with heat pump. BACKGROUND

[0002] With the expansion of energy storage battery application scenarios, to meet the safety regulations requirements, energy storage battery is more and more installed in outdoor environment. However, the outdoor environment temperature has great influence on the battery, which is easy to cause the battery operating temperature to deviate from the optimal working interval (15-35℃), and further affect the battery performance and life. The capacity of household energy storage battery is small, and it is costly and not economical to equip it with air conditioner or water cooling unit alone. Therefore, using the existing household heat pump system of user to provide heat dissipation and heating function for battery becomes a solution with higher economy and feasibility.

[0003] CN202311365678.5 A photovoltaic, energy storage and heat pump combined temperature control system: the patent innovatively combines photovoltaic, energy storage battery and heat pump system, actively regulates the temperature of energy storage battery cabinet through heat pump cooling and heating system, achieves efficient refrigeration, heating and temperature safety management, and reduces the cost and energy consumption of independent air conditioner configuration. However, the following deficiencies still exist in the design of the patent:

[0004] Direct connection of battery and heat pump: the fluctuation of battery thermal load directly affects the operation of heat pump. When the thermal load is small, the heat pump still needs to start refrigeration or heating frequently, which leads to the aggravation of compressor mechanical wear and tear, the increase of energy consumption, and the shortening of heat pump service life.

[0005] Limitations of heat exchanger scheme: the battery cabinet uses fan coil or radiant floor heating pipe (or both) as heat exchanger, which belongs to air cooling scheme. The temperature control effect of this scheme is poor, and the response speed is slow, which is difficult to meet the demand of efficient and rapid temperature regulation.

[0006] Defect 01 of prior art: energy storage battery is usually installed outdoors, and its temperature is significantly affected by environmental temperature and solar radiation. Excessive temperature may cause thermal runaway, while low temperature will significantly reduce the output power and service life of the battery. For outdoor battery with limited capacity, separately configuring temperature control equipment not only has high cost, but also increases additional energy consumption, which is poor in overall economy.

[0007] Defect 02 of prior art: most of the energy storage batteries currently used with heat pump system adopt air cooling design. The temperature control effect of air cooling scheme is limited, and it is difficult to achieve efficient and uniform temperature regulation, and the effect on improving battery life and energy density is not obvious.

[0008] Technical defect 03: In the existing heat pump type energy storage battery thermal management system, the battery is directly connected to the heat pump host through the pipeline system. When the battery temperature reaches the threshold value, the battery management system will frequently trigger the heat pump start-stop. This design has the following problems:

[0009] 1. Frequent start-stop causes increased mechanical wear of the heat pump compressor, shortening the service life of the equipment;

[0010] 2. The battery thermal load is usually much smaller than the refrigeration or heating capacity of the heat pump. The direct connection design is easy to cause the return water temperature to be too high, further increasing the compressor load and wasting energy. Invention content

[0011] In order to make up for the shortcomings of the prior art, the present application provides a liquid-cooled energy storage battery using a heat pump for thermal management to solve the problems existing in the prior art.

[0012] In order to solve the above technical problems, the present application provides the following technical solutions:

[0013] A liquid-cooled energy storage battery using a heat pump for thermal management, comprising:

[0014] A liquid-cooled battery for cooling and heating the battery module and DCDC module by liquid cooling;

[0015] A heat pump host including a heat pump plate heat exchanger, a heat pump circuit water pump and a heat pump circuit three-way valve for system refrigeration and heating and directing cold and heat to a buffer tank;

[0016] A buffer tank connected to the heat pump host through a buffer tank heat exchange coil and used to store cold or hot water directed by the heat pump; at the same time, the buffer tank is connected to the liquid-cooled battery through a buffer tank circuit water pump and a liquid-cooled battery circuit electromagnetic valve to provide cold and hot water for the liquid-cooled battery.

[0017] As a further technical solution of the present application, the liquid-cooled battery includes a front cover and a rear cover, and further includes a liquid-cooled pipeline for transferring cooling medium, the liquid-cooled pipeline including a secondary liquid-cooled pipeline, a tertiary liquid-cooled pipeline, a secondary liquid-cooled pipeline joint and an exhaust valve; further including a heat-conducting pad and a liquid-cooled plate for transferring cold or heat to the battery module and the DCDC module; further including a heat insulation sheet.

[0018] As a further technical solution of the present application, the heat pump host is connected to the liquid-cooled battery through a heat exchange coil and a buffer tank.

[0019] As a further technical solution of the present application, the liquid-cooled pipeline is installed outside the rear cover.

[0020] As a further technical scheme of the utility model: the battery module, the heat-conducting pad, the liquid cooling plate and the heat insulation sheet are installed inside the space composed of the front cover and the rear cover.

[0021] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0022] 1. The utility model discloses a heat pump system for temperature control management of the energy storage battery, without additional special temperature control equipment, thereby effectively reducing the system cost and improving the economy.

[0023] 2. The utility model discloses a full liquid cooling scheme, which precisely heats and cools the battery module and DCDC module through liquid cooling technology. Compared with air cooling, the liquid cooling design has more superior temperature control effect, significantly improves the battery energy density and prolongs the battery life.

[0024] 3. The utility model discloses a buffer water tank as an intermediate connecting device, which provides heating or cooling for the battery by using the water storage characteristics of the buffer water tank. Through indirect connection, the heat pump is avoided from frequent start and stop, the load of the compressor is effectively relieved, and the system operation efficiency and the heat pump service life are improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a heat pump type liquid cooling energy storage battery system diagram.

[0026] Figure 2 It is a liquid cooling battery front view schematic diagram.

[0027] Figure 3 It is a liquid cooling battery back view schematic diagram.

[0028] Figure 4 It is a liquid cooling battery explosion diagram. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the utility model will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0030] As Figure 1As shown, a liquid-cooled energy storage battery using a heat pump for thermal management includes: a liquid-cooled battery 1 for cooling and heating the battery module 107 and DCDC module 108 by liquid cooling; a heat pump host 2 including a heat pump plate heat exchanger 201, a heat pump circuit water pump 202 and a heat pump circuit three-way valve 203, for system refrigeration and heating and exporting cold and heat to a buffer water tank 401; the buffer water tank 401 is connected with the heat pump host 2 through the buffer water tank heat exchange coil 402, for storing the cold or hot water exported by the heat pump; at the same time, the buffer water tank 401 is connected with the liquid-cooled battery 1 through the buffer water tank circuit water pump 403 and the liquid-cooled battery circuit electromagnetic valve 501, to provide cold and hot water for the liquid-cooled battery 1.

[0031] The liquid-cooled battery 1 includes a front cover 101 and a rear cover 102 to seal and protect the internal structure of the liquid-cooled battery; includes a liquid cooling pipeline for transferring cooling medium, including a secondary liquid cooling pipeline 103, a tertiary liquid cooling pipeline 104, a secondary liquid cooling pipeline joint 105 and an exhaust valve 106 for transferring heat working substance; includes a heat-conducting pad 109a and a liquid cooling plate 109b for transferring cold or heat to the battery module 107 and the DCDC module 108; includes a heat insulation sheet 109c for preventing the cold or heat in the liquid cooling plate from being lost to the environment.

[0032] The liquid-cooled battery 1 includes a front cover 101 and a rear cover 102 to seal and protect the internal structure of the liquid-cooled battery; includes a liquid cooling pipeline for transferring cooling medium, including a secondary liquid cooling pipeline 103, a tertiary liquid cooling pipeline 104, a secondary liquid cooling pipeline joint 105 and an exhaust valve 106 for transferring heat working substance; includes a heat-conducting pad 109a and a liquid cooling plate 109b for transferring cold or heat to the battery module 107 and the DCDC module 108; includes a heat insulation sheet 109c for preventing the cold or heat in the liquid cooling plate from being lost to the environment.

[0033] The heat pump host 2 is indirectly connected with the liquid-cooled battery 1 through the heat exchange coil 402 and the buffer water tank 401.

[0034] The working principle is as follows:

[0035] In summer, the user generally starts the heat pump host 2 to refrigerate until the water temperature in the buffer tank 401 is reduced to a preset low temperature, and then the heat pump host 2 is turned off; when the temperature of the liquid-cooled battery 1 is higher than a preset high temperature upper threshold T_bat_H1, the buffer tank circuit water pump 403 and the liquid-cooled battery circuit electromagnetic valve 501 are both opened to take the cold water in the buffer tank 401 to cool the battery until the temperature of the liquid-cooled battery 1 is lower than a preset high temperature lower threshold T_bat_H2; if the ambient temperature is too high, or the liquid-cooled battery 1 is continuously charged and discharged for a long time, so that the water temperature in the buffer tank 401 is higher than the preset high temperature upper threshold T_tank_H1, the heat pump host 2 needs to open the refrigeration mode, and after the water temperature in the buffer tank 401 is reduced to the high temperature lower threshold T_tank_H2, the refrigeration mode is closed.

[0036] In winter, the user generally starts the heat pump host 2 to heat until the water temperature in the buffer tank 401 is increased to a preset high temperature, and then the heat pump host 2 is turned off; when the temperature of the liquid-cooled battery 1 is lower than a preset low temperature lower threshold T_bat_L1, the buffer tank circuit water pump 403 and the liquid-cooled battery circuit electromagnetic valve 501 are both opened to take the hot water in the buffer tank 401 to heat the battery until the temperature of the liquid-cooled battery 1 is higher than a preset low temperature upper threshold T_bat_L2; if the ambient temperature is too low, the liquid-cooled battery 1 needs to be heated for a long time, so that the water temperature in the buffer tank 401 is higher than the preset low temperature lower threshold T_tank_L1, the heat pump host 2 needs to open the heating mode, heat the water temperature in the buffer tank 401 to the low temperature upper threshold T_tank_L2, and then close the refrigeration mode.

[0037] The utility model discloses a heat pump system in the user's home is used to carry out accurate heat management to the liquid-cooled battery, and stable temperature control effect can be realized in the cold and hot environment,

[0038] The utility model discloses introduce buffer tank as intermediate connecting device, utilize the storage and buffer characteristic of buffer tank, reduce the start -stop frequency of heat pump significantly, reduce the high frequency operation of compressor.

[0039] For those skilled in the art, it is obvious that the utility model is not limited to the details of the above-mentioned exemplary embodiments, and can be realized in other specific forms without departing from the spirit or basic characteristics of the utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the utility model is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the utility model.

[0040] Furthermore, it should be understood that although the description is made according to the embodiments, not every embodiment contains only one independent technical solution, and the description is made in this way only for the sake of clarity, and the person skilled in the art should understand the description as a whole, and the technical solutions in each embodiment have been properly combined to form other embodiments which are easily understood by the person skilled in the art.

Claims

1. A liquid-cooled energy storage battery that utilizes a heat pump for thermal management, characterized in that: include: A liquid-cooled battery (1) is used to dissipate heat and heat the battery module (107) and the DC-DC module (108) by means of liquid cooling; The heat pump host (2) includes a heat pump plate heat exchanger (201), a heat pump loop water pump (202) and a heat pump loop three-way valve (203), which are used for system cooling and heating and to export the cold and heat to the buffer water tank (401). A buffer water tank (401) is connected to the heat pump host (2) via a buffer water tank heat exchange coil (402) and is used to store cold or hot water discharged by the heat pump. At the same time, the buffer water tank (401) is connected to the liquid-cooled battery (1) via a buffer water tank loop pump (403) and a liquid-cooled battery loop solenoid valve (501) to provide cold or hot water to the liquid-cooled battery (1).

2. A liquid-cooled energy storage battery using a heat pump for thermal management according to claim 1, characterized in that, The liquid-cooled battery (1) includes a front cover (101) and a rear cover (102), and also includes a liquid-cooling pipeline for transmitting the cooling medium. The liquid-cooling pipeline includes a secondary liquid-cooling pipeline (103), a tertiary liquid-cooling pipeline (104), a secondary liquid-cooling pipeline connector (105), and an exhaust valve (106). It also includes a thermal pad (109a) and a liquid-cooling plate (109b) for transferring cold or heat to the battery module (107) and the DC-DC module (108). It also includes a heat insulation sheet (109c).

3. A liquid-cooled energy storage battery using a heat pump for thermal management according to claim 1, characterized in that, The heat pump host (2) is connected to the liquid-cooled battery (1) through a heat exchange coil (402) and a buffer water tank (401).

4. A liquid-cooled energy storage battery using a heat pump for thermal management according to claim 2, characterized in that, The liquid cooling pipeline is installed outside the rear cover (102).

5. A liquid-cooled energy storage battery using a heat pump for thermal management according to claim 3, characterized in that, The battery module (107), thermal pad (109a), liquid cooling plate (109b) and heat insulation sheet (109c) are installed inside the space formed by the front cover (101) and the rear cover (102).

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