Battery liquid cooling system and operating machinery

Abstract

The present invention relates to the field of battery energy technology, and provides a battery liquid cooling system. The system comprises a battery, a first cold source, a second cold source and a reversing valve device, wherein a heat exchange device is arranged inside the battery; the first cold source comprises a third interface and a fourth interface; the second cold source comprises a fifth interface and a sixth interface; the reversing valve device comprises a plurality of interfaces, and the plurality of interfaces are respectively connected to the first interface, the second interface, the third interface, the fourth interface, the fifth interface and the sixth interface in a one-to-one correspondence; the reversing valve device can switch between a first valve position, a second valve position, a third valve position and a fourth valve position. The present invention can realize the alternating change of the forward or reverse flow of the cooling medium inside the battery, has a plurality of battery cooling modes, and can meet a plurality of battery cooling requirements in low temperature and normal high temperature environments.

Description

Technical Field

[0001] The present invention relates to the field of battery energy technology, and in particular to a battery liquid cooling system and an operating machine. Background Art

[0002] The heat accumulation generated by the battery during the charge and discharge process will cause uneven heat distribution in various parts of the battery, reduce the efficiency of the battery charge and discharge cycle, affect the power and energy of the battery, and in severe cases lead to thermal runaway, affecting the safety and reliability of the system. In order to achieve the best performance and life of the battery, it is necessary to effectively manage the battery's heat and control the battery temperature within a reasonable range.

[0003] The battery cooling technology in the prior art generally adopts the method of adding a heat dissipation circuit in the battery, connecting it with the air conditioner through a heat exchanger, controlling the battery inlet water temperature and flow, and thus controlling the battery to operate within an appropriate temperature.

[0004] The battery cooling technology solutions in the prior art are generally applicable to a single working environment temperature condition, such as low temperature conditions or normal high temperature conditions, but the battery cooling technology solutions in the prior art are less applicable to the complex and changing environment existing in the actual environment, and the heat dissipation effect is not obvious, and may not even be applicable to complex working conditions. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a battery liquid cooling system, which can realize the first cold source cooling alone, the second cold source cooling alone and the mixed cooling of the two. By switching the valve position of the reversing valve device by the control system, the cooling medium inside the battery can also be alternately changed to flow forward or reverse. The battery liquid cooling system has multiple battery cooling modes, covers multiple battery working scenes, and can meet various cooling needs in low temperature and normal high temperature environments.

[0006] The present invention provides a battery liquid cooling system, comprising:

[0007] A battery, provided with a heat exchange device, the heat exchange device comprising a first interface and a second interface;

[0008] A first cold source, adapted to perform cooling and output cooling medium when the ambient temperature is lower than a first preset temperature, comprising a third interface and a fourth interface;

[0009] A second cold source, adapted to perform refrigeration and output cooling medium when the ambient temperature is equal to or higher than the first preset temperature, comprising a fifth interface and a sixth interface;

[0010] The reversing valve device comprises a plurality of interfaces, and the plurality of interfaces are respectively connected with the first interface, the second interface, the third interface, the fourth interface, the fifth interface and the sixth interface in a one-to-one correspondence; wherein,

[0011] The reversing valve device can be switched between a first valve position, a second valve position, a third valve position and a fourth valve position. In the first valve position or the second valve position, the first cold source, the heat exchange device and the second cold source are connected in series to form a first cooling circulation path, and when the first valve position is switched to the second valve position, the flow direction of the cooling medium in the heat exchange device is opposite;

[0012] In the third valve position or the fourth valve position, the second cold source is connected in series with the heat exchange device to form a second cooling circulation passage, and when the third valve position is switched to the fourth valve position, the flow direction of the cooling medium in the heat exchange device is opposite.

[0013] According to the battery liquid cooling system provided by the present invention, the battery liquid cooling system further includes:

[0014] A control system is electrically connected to the first cold source, the second cold source and the reversing valve device, the control system is used to control the opening and closing of the first cold source and the second cold source, and the control system is used to control the valve position switching of the reversing valve device.

[0015] According to the battery liquid cooling system provided by the present invention, when the ambient temperature is lower than the first preset temperature and the temperature of the battery is lower than the second preset temperature, the control system controls the first cold source to turn on and the second cold source to turn off, and the control system controls the reversing valve device to switch to the first valve position or the second valve position.

[0016] According to the battery liquid cooling system provided by the present invention, when the ambient temperature is equal to or higher than the first preset temperature and the temperature of the battery is lower than the second preset temperature, the control system controls the first cold source to be turned off and the second cold source to be turned on, and the control system controls the reversing valve device to switch to the third valve position or the fourth valve position.

[0017] According to the battery liquid cooling system provided by the present invention, when the temperature of the battery is equal to or higher than the second preset temperature, the control system controls the first cold source and the second cold source to be turned on, and the control system controls the reversing valve to switch to the first valve position or the second valve position.

[0018] According to the battery liquid cooling system provided by the present invention, when the temperature difference between the two ends of the battery is equal to or greater than the first preset temperature difference, the control system controls the first cold source and the second cold source to be closed, and the control system controls the reversing valve device to switch to the first valve position or the second valve position.

[0019] According to the battery liquid cooling system provided by the present invention, when the temperature difference between the two ends of the battery is greater than the second preset temperature difference and less than the first preset temperature difference, the control system controls the first cold source and the second cold source to be closed, and the control system controls the reversing valve device to switch to the third valve position or the fourth valve position.

[0020] According to the battery liquid cooling system provided by the present invention, the battery liquid cooling system further comprises: a first temperature sensor, the first temperature sensor being used to sense the ambient temperature;

[0021] A first temperature sensor component, the first temperature sensor component is used to sense the temperature of the battery; wherein,

[0022] The first temperature sensor and the first temperature sensor assembly are both electrically connected to the control system.

[0023] According to the battery liquid cooling system provided by the present invention, the first temperature sensor assembly further comprises at least a plurality of second temperature sensors arranged at both ends of the battery, and the second temperature sensors are used to sense the temperature at both ends of the battery;

[0024] The control system is electrically connected to the plurality of second temperature sensors for calculating the temperature difference between the two ends of the battery.

[0025] The present invention also provides a working machine, comprising a battery liquid cooling system, wherein the battery liquid cooling system is the battery liquid cooling system as described in any one of the above items.

[0026] The above one or more technical solutions in the embodiments of the present invention have at least one of the following technical effects:

[0027] When the first cold source and the second cold source are both turned on, since the first cold source is connected in series to the second cold source, the cooling medium flows through the first cold source and the second cold source at the same time, and the cooling medium is refrigerated by the first cold source and the second cold source at the same time. When the cooling medium flows through the battery, the battery in the fast charging state or the battery that needs emergency cooling can be quickly cooled; the control system is connected to the reversing valve device, and when the valve position of different reversing valve devices is changed, the paired connection relationship between different interfaces can be adjusted. After passing through the reversing valve device, the cooling medium flows into the first interface of the battery and flows out of the second interface of the battery, or the cooling medium flows into the second interface of the battery and flows out of the first interface of the battery. Changing the flow direction of the cooling medium inside the battery can make the cooling medium inside the battery alternately flow in the forward or reverse direction; the battery liquid cooling system can be applicable to multiple battery cooling conditions, can be applicable to low temperature, normal temperature and high temperature battery working environments, can also meet the temperature control requirements of rapid cooling of batteries that need fast charging or large heat release, and also support single cooling device cooling and mixed cooling, covering multiple battery cooling scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 is a schematic diagram of a battery liquid cooling system according to an embodiment of the present invention;

[0030] Figure 2 is a first mode principle diagram of a battery cooling mode provided by an embodiment of the present invention;

[0031] Figure 3 is a second mode principle diagram of a battery cooling mode provided by an embodiment of the present invention;

[0032] Figure 4 is a third mode principle diagram of the battery cooling mode provided by an embodiment of the present invention;

[0033] Figure 5 is a fourth mode principle diagram of the battery cooling mode provided by an embodiment of the present invention;

[0034] Figure 6 is a fifth mode principle diagram of the battery cooling mode provided by an embodiment of the present invention;

[0035] Figure 7 is a sixth mode principle diagram of the battery cooling mode provided by an embodiment of the present invention;

[0036] Figure 8 is a seventh mode principle diagram of the battery cooling mode provided by an embodiment of the present invention;

[0037] Fig. 9 is a schematic diagram of an eighth mode of a battery cooling mode provided by an embodiment of the present invention;

[0038] Fig.10 is a ninth mode principle diagram of a battery cooling mode provided by an embodiment of the present invention;

[0039] Fig.11 is a tenth mode principle diagram of a battery cooling mode provided by an embodiment of the present invention;

[0040] Reference numerals:

[0041] 1. First cold source; 2. Reversing valve device; 3. Battery; 4. Second cold source; 5. Control system. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0044] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0045] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0046] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0047] Combine the following Figures 1 to 11 An embodiment of the present invention provides a battery liquid cooling system, which mainly includes a battery 3, a first cold source 1, a second cold source 4, and a reversing valve device 2.

[0048] Specifically, the battery 3 may be a power battery, and a heat exchange device is provided inside the battery 3. The heat exchange device includes a first interface and a second interface. The first interface and the second interface are for a cooling medium to flow in and out of the battery 3. A channel is provided between the first interface and the second interface for the cooling medium to flow through the battery 3. When the cooling medium flows through the battery 3 through the first interface and the second interface, it will take away the heat generated by the battery 3 during operation, so that the battery 3 operates within a suitable temperature range.

[0049] Furthermore, the cross section of the battery 3 may be circular, square or other shapes, and the specific shape is not limited.

[0050] In this embodiment, the first cold source 1 is suitable for refrigerating and outputting cooling medium when the ambient temperature is lower than the first preset temperature. The first cold source 1 at least includes a first refrigeration component and a first driving component. The first refrigeration component can be a water-cooled condenser or other forms of condensers. The first refrigeration component is suitable for refrigeration at sub-zero ambient temperatures. The first refrigeration component is used to cool the cooling medium flowing through the first cold source 1. Heat flows from the cooling medium flowing through the first cold source 1 to the refrigerant to cool the cooling medium flowing through the first cold source 1. The specific types of condensers are mature technologies in this field, and the specific types of condensers in this embodiment are not described in detail here.

[0051] In a possible embodiment, there is a refrigerant in the condenser of the first refrigeration component. The refrigerant in the first refrigeration component can be a low-temperature refrigerant, which is suitable for refrigeration at sub-zero ambient temperatures.

[0052] Furthermore, the first drive component can be a water pump or other form of driving power machinery, and the first drive component is used to drive the cooling medium to flow in an orderly manner in the first cooling circulation passage to achieve the circulation flow of the cooling medium. Simply put, the first drive component is used to drive the cooling medium to flow in an orderly manner in a preset direction.

[0053] In this embodiment, the first cold source 1 and the second cold source 4 are both collective cold source devices. The first cold source 1 can be an electric cold source device such as a piston cold source device or a screw cold source device, or it can be an absorption cold source device. The specific types of the first cold source 1 and the second cold source 4 are not specifically limited here.

[0054] In this embodiment, the first cold source 1 and the second cold source 4 at least include a circulating water pump and an expansion kettle assembly, wherein the expansion kettle assembly is a container for filling and compensating the cooling medium for the first cold source 1 and the second cold source 4. According to different working principles, the first cold source 1 and the second cold source 4 may also include components such as a plate heat exchanger, a compressor, a condenser, and a radiator. As for the specific internal components of the first cold source 1 and the second cold source 4, they are mature technologies in the field and will not be described here.

[0055] The first refrigeration component starts refrigeration after receiving the signal from the control system 5 to start refrigeration, and cools the cooling medium flowing through the first cold source 1. Since the cooling medium continues to flow through the first cold source 1, the cooled cooling medium circulates through the battery 3, taking away the heat generated by the battery 3, ensuring that the battery 3 operates within a reasonable temperature range.

[0056] Furthermore, a third interface and a fourth interface are provided on the first cold source 1. After the first driving component receives a signal from the control system 5 to start driving, the cooling medium flows in from the third interface of the first cold source 1 and flows out from the fourth interface. The driving component drives the cooling medium to flow through the interior of the first cold source 1, and allows the cooling medium to flow from the first cold source 1 into the reversing valve device 2 through the connecting component.

[0057] Furthermore, when only the first cold source 1 is turned on in the battery liquid cooling system, since the first cold source 1 can select a coolant suitable for a lower temperature environment, the battery liquid cooling system can be suitable for cooling the battery 3 in a low temperature environment.

[0058] In this embodiment, the second cold source 4 is suitable for cooling and outputting cooling medium when the ambient temperature is equal to or higher than the first preset temperature. The second cold source 4 includes at least a second refrigeration component and a second drive component. The second refrigeration component can be a water-cooled condenser or other forms of condensers. The second refrigeration component is suitable for cooling at ambient temperatures of zero degrees and above zero. The second refrigeration component is used to cool the cooling medium flowing through the second cold source 4. Heat flows from the cooling medium flowing through the second cold source 4 to the refrigerant to cool the cooling medium flowing through the second cold source 4.

[0059] In a possible embodiment, there is a refrigerant in the condenser of the second refrigeration component. The refrigerant in the second refrigeration component can be a normal high temperature refrigerant, which is suitable for refrigeration at an ambient temperature of zero degrees or above.

[0060] Furthermore, the second drive component can be a water pump or other form of driving power machinery, and the second drive component is used to drive the cooling medium to flow in an orderly manner in the second cooling circulation passage to achieve the circulation flow of the cooling medium. Simply put, the second drive component is used to drive the cooling medium to flow in an orderly manner in a preset direction.

[0061] Furthermore, the second cold source 4 is provided with a channel for the cooling medium to flow through the second cold source 4. The second refrigeration component starts refrigeration after receiving a signal from the control system 5 to start refrigeration, and cools the cooling medium flowing through the internal channel of the second cold source 4. Since the cooling medium continues to flow through the second cold source 4, the cooled cooling medium circulates through the battery 3, takes away the heat of the battery 3, and ensures that the battery 3 operates within a reasonable set temperature range.

[0062] Furthermore, the second cold source 4 is provided with a fifth interface and a sixth interface. After the second driving component receives a signal from the control system 5 to start driving, the cooling medium flows in from the fifth interface of the second cold source 4 and flows out from the sixth interface. The driving component drives the cooling medium to flow through the internal channel of the second cold source 4, and allows the cooling medium to flow from the second cold source 4 into the reversing valve device 2 through the connecting component.

[0063] Furthermore, when only the second cold source 4 is turned on in the battery liquid cooling system, since the second cold source 4 selects a coolant suitable for normal temperature and high temperature environments, the battery liquid cooling system can be suitable for cooling the battery 3 under normal temperature and high temperature environment conditions.

[0064] In this embodiment, the reversing valve device 2 is provided with a plurality of interfaces, which are respectively connected to the first interface, the second interface, the third interface, the fourth interface, the fifth interface and the sixth interface in a one-to-one correspondence. After the reversing valve device 2 receives the valve position switching instruction issued by the control system 5, the valve core inside the reversing valve device 2 moves, and the working position of the valve core inside the reversing valve device 2 changes in the reversing valve device 2, so the reversing valve device 2 can switch between the first valve position, the second valve position, the third valve position and the fourth valve position. When the valve position of the reversing valve device 2 changes, the interface through which the cooling medium flows out of the reversing valve device 2 also changes accordingly.

[0065] In a possible embodiment, the reversing valve device 2 can be composed of multiple reversing valve groups. The reversing valve device 2 needs to have at least a first valve position, a second valve position, a third valve position and a fourth valve position. The specific components of the reversing valve device 2 are not limited here.

[0066] In this embodiment, in the first valve position or the second valve position state, the first cold source 1, the heat exchange device and the second cold source 4 are connected in series to form a first cooling circulation passage, the first cooling circulation passage includes the first cold source 1, the reversing valve device 2, the second cold source and the battery 3, and the cooling medium can circulate in the first circulation passage; in the third valve position or the fourth valve position state, the second cold source 4 is connected in series with the heat exchange device to form a second cooling circulation passage, the second cooling circulation passage includes the battery 3, the second cold source 4, the reversing valve device 2, and the cooling medium can circulate in the second cooling circulation passage.

[0067] In this way, when the first cold source 1 and the second cold source 4 are turned on at the same time, since the first cold source 1 is connected in series to the second cold source 4, when the cooling medium flows inside the liquid cooling system of the battery 3, the cooling medium flows through the first cold source 1 and the second cold source 4 at the same time, and the cooling medium is simultaneously cooled by the first cold source 1 and the second cold source 4. When the cooling medium flows through the inside of the battery 3, the battery 3 in the fast charging state or the battery 3 that needs emergency cooling can be quickly cooled.

[0068] Furthermore, an internal channel of the battery 3 is provided between the first interface and the second interface of the battery 3, and the first cold source 1 and the second cold source 4 are provided with internal channels of the first cold source 1 and the second cold source 4, respectively. The internal communication channel of the reversing valve device 2, the internal channel of the battery 3, the internal channel of the first cold source 1, the internal channel of the second cold source 4 and the connecting assembly together form a connecting space, and the cooling medium circulates in the connecting space. The reversing valve device 2 is connected to the battery 3, the first cold source 1 and the second cold source 4 respectively through the connecting assembly, so that the reversing valve device 2, the battery 3, the first cold source 1 and the second cold source 4 are connected to each other.

[0069] Specifically, the connection assembly can be a plurality of hollow hoses, and the specific structure is not limited here.

[0070] In this embodiment, a cooling medium is provided inside the battery 3, the first cold source 1, the second cold source 4, the reversing valve device 2 and the connecting component. The cooling medium circulates in the connecting space to take away the heat of the battery 3 and keep the battery 3 in a uniform temperature state.

[0071] Specifically, the cooling medium may be in liquid state, etc., and the specific type of the cooling medium is not limited here.

[0072] In this embodiment, if Figure 1 As shown, the battery liquid cooling system also includes a control system 5, which is connected to the reversing valve device 2. The control system 5 is electrically connected to the first cold source 1, the second cold source 4 and the reversing valve device 2. The control system 5 is used to control the valve position switching of the reversing valve device 2. When the reversing valve device 2 receives the valve position switching signal of the control system 5, the valve core inside the reversing valve device 2 moves, and the working position of the valve core inside the reversing valve device 2 changes in the reversing valve device 2, that is, the valve position of the reversing valve device 2 switches.

[0073] Furthermore, the control system 5 is electrically connected to the first refrigeration assembly, the second refrigeration assembly, the first drive assembly, and the second drive assembly. The control system 5 controls the opening of the first refrigeration assembly and the second refrigeration assembly through a control signal, and is used to control the opening and closing of the refrigeration functions of the first cold source 1 and the second cold source 4. The control system 5 controls the opening and closing of the first drive assembly and the second drive assembly through a control signal, and can be used to control the flow direction of the cooling medium in the first cooling circulation passage or the second cooling circulation passage.

[0074] With such a configuration, the paired connection relationship between different interfaces changes, and the interface through which the cooling medium flows out of the reversing valve device 2 also changes. The cooling medium flows out from the fourth interface of the first cold source 1 or the sixth interface of the second cold source 4. By switching the valve positions of different reversing valve devices 2, the cooling medium can flow into the first interface of the battery 3 after passing through the reversing valve device 2 and flow out of the second interface of the battery 3, or the cooling medium can flow into the second interface of the battery 3 and flow out of the first interface of the battery 3. The control system 5 is connected to the reversing valve device 2, and different valve positions of the reversing valve device 2 can be switched to change the flow direction of the cooling medium in the battery 3.

[0075] In this embodiment, the battery liquid cooling system further includes a first temperature sensor and a first temperature sensor assembly. The first temperature sensor is used to sense the ambient temperature of the environment where the battery 3 is located, and the first temperature sensor assembly is used to sense the temperature of the battery 3. The first temperature sensor assembly also includes at least a plurality of second temperature sensors arranged at both ends of the battery 3, and the second temperature sensors are used to sense the temperature at both ends of the battery 3. The first temperature sensor and the first temperature sensor assembly are both electrically connected to the control system 5, and the control system 5 is also electrically connected to the plurality of second temperature sensors. The control system 5 includes at least a collection module, a control module, and a calculation module. The collection module collects the ambient temperature of the battery 3 and the temperature of the battery 3 respectively through the first temperature sensor and the first temperature sensor assembly, and the ambient temperature signal and the temperature signal of the battery 3 are directly transmitted to the control module. The control system 5 also collects the temperature at both ends of the battery 3 by controlling the plurality of second temperature sensors to calculate the temperature difference at both ends of the battery 3. The temperature signal at both ends of the battery 3 is first transmitted from the collection module to the calculation module, and the calculation module calculates the temperature difference at both ends of the battery 3 through the temperature at both ends of the battery 3, and the calculation module then outputs the temperature difference signal at both ends of the battery 3 to the control module.

[0076] Furthermore, when the ambient temperature, the battery sensing temperature and the temperature difference between the two ends of the battery 3 are input into the control system 5 in the form of electrical signals, the control module determines the battery cooling mode to be selected, and the control system 5 can simultaneously control the opening and closing of the first cold source 1 and the second cold source 4, the flow direction of the flowing medium, and the valve position switching of the reversing valve device 2.

[0077] In some embodiments, the control system 5 is connected to the first refrigeration assembly and the second refrigeration assembly, and is used to control the opening and closing of the first refrigeration assembly and the second refrigeration assembly respectively. The first cold source 1 and the second cold source 4 can cool the cooling medium at the same time. The control system 5 is also connected to the first drive assembly and the second drive assembly, and is used to control the opening and closing of the first drive assembly and the second drive assembly respectively. Accordingly, in this embodiment, when the control system 5 controls the battery liquid cooling system to work, 10 battery cooling modes can be realized, as described below.

[0078] For the convenience of description, the six interfaces distributed on the reversing valve device 2 are marked as A, B, C, D, E, and F respectively. At the same time, the fourth interface of the first cold source 1 is connected to C through a connecting component, the third interface of the first cold source 1 is connected to B through a connecting component, the sixth interface of the second cold source 4 is connected to A through a connecting component, the fifth interface of the second cold source 4 is connected to E through a connecting component, the first interface of the battery 3 is connected to D through a connecting component, and the second interface of the battery 3 is connected to F through a connecting component.

[0079] The control system 5 can form the following battery cooling mode by simultaneously controlling the valve position switching of the reversing valve device 2, the opening and closing of the first refrigeration component and the second refrigeration component, and the opening and closing of the first drive component and the second drive component:

[0080] Mode 1, such as Figure 2 As shown:

[0081] Opening and closing of the first cold source 1 and the second cold source 4: the first cold source 1 is turned on, and the second cold source 4 is turned off.

[0082] Valve position of reversing valve device 2: first valve position, i.e. C-D; F-E; A-B.

[0083] The flow direction of the cooling medium in the first cooling circulation passage is: fourth interface—C—D—first interface—second interface—F—E—fifth interface—sixth interface—A—B—third interface.

[0084] The direction of the cooling medium flowing through the battery 3: first interface—second interface (forward direction); it should be noted that the flow direction of the cooling medium from the first interface to the second interface of the battery 3 is set as the forward circulation flow direction of the cooling medium in the battery 3.

[0085] Temperature conditions for mode selection: the ambient temperature is lower than the first preset temperature, and the battery sensing temperature is lower than the second preset temperature; it should be noted that the first preset temperature can be 0 degrees Celsius, and the second preset temperature can be 40 degrees Celsius; a refrigerant suitable for sub-zero temperature environments can be selected in the first refrigeration component, and the first refrigeration component can be used to cool the battery 3 when it is working in a sub-zero temperature environment.

[0086] Mode 2, such as Figure 3 As shown:

[0087] Opening and closing of the first cold source 1 and the second cold source 4: the first cold source 1 is turned on, and the second cold source 4 is turned off.

[0088] Valve position of reversing valve device 2: the second valve position, i.e. C-F; D-A; E-B.

[0089] The flow direction of the cooling medium in the first cooling circulation passage is: fourth interface—C—F—second interface—first interface—D—A—sixth interface—fifth interface—E—B—third interface.

[0090] The direction of the cooling medium flowing through the battery 3 is: second interface—first interface (reverse direction).

[0091] Temperature conditions for mode selection: the ambient temperature is lower than the first preset temperature, and the battery sensing temperature is lower than the second preset temperature.

[0092] Mode three, such as Figure 4 As shown:

[0093] Opening and closing of the first cold source 1 and the second cold source 4: the first cold source 1 is closed, and the second cold source 4 is opened.

[0094] Valve position of reversing valve device 2: the third valve position, i.e. A-D; F-E; B and C are closed.

[0095] The flow direction of the cooling medium in the second cooling circulation passage is: the sixth interface—A—D—the first interface—the second interface—F—E—the fifth interface; it should be noted that, when only the second cold source 4 is turned on, the cooling medium does not flow through the first cold source 1, and the interfaces B and C of the reversing valve device 2 are closed.

[0096] The direction in which the cooling medium flows through the battery 3 is: first interface→second interface (forward direction).

[0097] Temperature conditions for mode selection: the ambient temperature is equal to or higher than the first preset temperature, and the battery sensing temperature is lower than the second preset temperature; it should be noted that a refrigerant suitable for an environment with a temperature above zero can be selected in the second refrigeration component, and the second refrigeration component can be used to cool the battery 3 when it is working in an environment with a temperature above zero.

[0098] Mode 4, such as Figure 5 As shown:

[0099] Opening and closing of the first cold source 1 and the second cold source 4: the first cold source 1 is closed, and the second cold source 4 is opened.

[0100] Valve position of reversing valve device 2: the fourth valve position, i.e. A-F; D-E; B and C are closed.

[0101] The flow direction of the cooling medium in the second cooling circulation passage is: the sixth interface—A—F—the second interface—the first interface—D—E—the fifth interface.

[0102] The direction of the cooling medium flowing through the battery 3 is: second interface—first interface (reverse direction).

[0103] Temperature conditions for mode selection: the ambient temperature is equal to or higher than the first preset temperature, and the battery sensing temperature is lower than the second preset temperature.

[0104] Mode 5, such as Figure 6 As shown:

[0105] Opening and closing of the first cold source 1 and the second cold source 4: the first cold source 1 is turned on, and the second cold source 4 is turned on.

[0106] Valve position of reversing valve device 2: first valve position, i.e. C-D; F-E; A-B.

[0107] The flow direction of the cooling medium in the first cooling circulation passage is the same as the flow direction of the cooling medium in mode one.

[0108] The direction in which the cooling medium flows through the battery 3 is: first interface→second interface (forward direction).

[0109] Temperature conditions for mode selection: the battery sensing temperature is higher than the second preset temperature; it should be noted that when the battery sensing temperature is higher than the second preset temperature, the battery 3 is in a rapid heating state (battery 3 fast charging state), or the battery 3 is in a state requiring rapid cooling; the first cold source 1 is connected in series with the second cold source 4 through the reversing valve device 2, and when the cooling medium flows inside the battery liquid cooling system, when the first cold source 1 and the second cold source 4 are both turned on, the battery 3 is cooled by the first cold source 1 and the second cold source 4 at the same time, and the battery 3 can be rapidly cooled.

[0110] Mode six, such as Figure 7 Shown:

[0111] Opening and closing of the first cold source 1 and the second cold source 4: the first cold source 1 is turned on, and the second cold source 4 is turned on.

[0112] Valve position of reversing valve device 2: the second valve position, i.e. C-F; D-A; E-B.

[0113] The flow direction of the cooling medium in the first cooling circulation passage is the same as the flow direction of the cooling medium in mode 2.

[0114] The direction of the cooling medium flowing through the battery 3 is: second interface—first interface (reverse direction).

[0115] Temperature condition for mode selection: the battery sensing temperature is higher than the second preset temperature.

[0116] Mode 7, such as Figure 8 As shown:

[0117] Opening and closing of the first cold source 1 and the second cold source 4: the first cold source 1 is closed, and the second cold source 4 is closed.

[0118] Valve position of reversing valve device 2: first valve position, i.e. C-D; F-E; A-B.

[0119] The flow direction of the cooling medium in the first cooling circulation passage is the same as the flow direction of the cooling medium in mode one.

[0120] The direction in which the cooling medium flows through the battery 3 is: first interface→second interface (forward direction).

[0121] Temperature conditions for mode selection: the temperature difference between the two ends of the battery 3 is equal to or greater than the first preset temperature difference; it should be noted that the first preset temperature difference can be 10 degrees Celsius. When the temperature difference between the two ends of the battery 3 is equal to or greater than the first preset temperature difference, it means that the temperature difference between the two ends of the battery 3 is large, and the temperature balance in the battery 3 is poor. The first cold source 1 and the second cold source 4 need to be turned off, and the battery liquid cooling system stops cooling. Since the temperature difference between the two ends of the battery 3 is large at this time, the internal temperature balance of the battery 3 is poor, so a large flow of unrefrigerated cooling medium is required to flow through the heat exchanger to quickly reduce the temperature difference between the two ends of the battery 3; correspondingly, since the cooling medium flow in the first cooling circulation passage is greater than the cooling medium flow in the second cooling circulation passage, it is necessary to adjust the cooling medium to circulate in the first circulation passage, that is, the valve position of the reversing valve device 2 is switched to the first valve position or the second valve position, so as to quickly reduce the temperature difference between the two ends of the battery 3, quickly ensure the balance of the internal temperature of the battery 3, and prevent the temperature difference inside the battery 3 from being too large to damage the battery 3.

[0122] Mode eight, such as Fig. 9 As shown:

[0123] Opening and closing of the first cold source 1 and the second cold source 4: the first cold source 1 is closed, and the second cold source 4 is closed.

[0124] Valve position of reversing valve device 2: the second valve position, i.e. C-F; D-A; E-B.

[0125] The flow direction of the cooling medium in the first cooling circulation passage is the same as the flow direction of the cooling medium in mode 2.

[0126] The direction of the cooling medium flowing through the battery 3 is: second interface—first interface (reverse direction).

[0127] Temperature condition for mode selection: the temperature difference between the two ends of the battery 3 is equal to or greater than the first preset temperature difference.

[0128] Mode nine, such as Fig.10 As shown:

[0129] Opening and closing of the first cold source 1 and the second cold source 4: the first cold source 1 is closed, and the second cold source 4 is closed.

[0130] Valve position of reversing valve device 2: the third valve position, i.e. A-D; F-E; B and C are closed.

[0131] The flow direction of the cooling medium in the second cooling circulation passage is the same as the flow direction of the cooling medium in mode three.

[0132] The direction in which the cooling medium flows through the battery 3 is: first interface→second interface (forward direction).

[0133] Temperature conditions for mode selection: the temperature difference between the two ends of the battery 3 is greater than the second preset temperature difference and less than the first preset temperature difference; it should be noted that the second preset temperature difference can be 6 degrees Celsius; when the reversing valve device 2 switches the working position of the valve core so that the interfaces B and C are closed, part of the cooling medium in the first cold source 1 does not participate in the cooling of the battery 3, and the flow rate of the cooling medium in the second cooling circulation passage is smaller than the flow rate of the cooling medium in the first cooling circulation passage; when the temperature difference between the two ends of the battery 3 is between the first preset temperature difference and the second preset temperature difference, only a small flow rate of cooling medium in a non-refrigeration state is required to flow through the battery 3, that is, to meet the demand for reducing the temperature difference between the two ends of the battery 3, and the balance of the internal temperature of the battery 3 can be ensured. With this arrangement, when the reversing valve device 2 is switched to the third valve position or the fourth valve position, the cooling medium flows through the second cooling circulation passage to save energy. At this time, the battery liquid cooling system is suitable for the working condition where a small flow rate of cooling medium in a non-refrigeration state flows through the battery 3.

[0134] Mode 10, such as Fig.11 As shown:

[0135] Opening and closing of the first cold source 1 and the second cold source 4: the first cold source 1 is closed, and the second cold source 4 is closed.

[0136] Valve position of reversing valve device 2: the fourth valve position, i.e. A-F; D-E; B and C are closed.

[0137] The flow direction of the cooling medium in the second cooling circulation passage is the same as the flow direction of the cooling medium in mode four.

[0138] The direction of the cooling medium flowing through the battery 3 is: second interface—first interface (reverse direction).

[0139] Temperature condition for mode selection: the temperature difference between the two ends of the battery 3 is greater than the second preset temperature difference and less than the first preset temperature difference.

[0140] It can be seen that the battery liquid cooling system provided by the present invention can realize the single cooling of the first cold source 1, the single cooling of the second cold source 4, and the mixed cooling of the two by simultaneously controlling the opening and closing of the first refrigeration component, the second refrigeration component, the first drive component, and the second drive component through the control system 5, and controlling the switching of the reversing valve device 2 to different valve positions. By switching the valve position of the reversing valve device 2 by the control system 5, when switching from the first valve position to the second valve position, the flow direction of the cooling medium in the heat exchange device changes from the forward direction to the reverse direction, and when switching from the third valve position to the fourth valve position, the flow direction of the cooling medium in the heat exchange device changes from the forward direction to the reverse direction, so that the cooling medium inside the battery 3 can be alternately changed to the forward or reverse flow, and the battery liquid cooling system has a variety of battery cooling modes.

[0141] In the present embodiment, in the battery cooling mode, in the seventh, eighth, ninth and tenth modes, the first cold source 1 and the second cold source 4 are not turned on for cooling; when the cooling medium circulates in the first cooling circulation path or the second cooling circulation path, the cooling medium passes through the heat exchange device. Since the heat transfer is directional, when the cooling medium flows in the battery 3 along the flow direction, the temperature of the end where the cooling medium flows into the battery 3 is higher than the end where the cooling medium flows out of the battery 3. There is actually a certain temperature difference inside the battery 3. When the first cold source 1 and the second cold source 4 stop cooling, the temperature of the cooling medium rises, and the cooling effect of the cooling medium on the heat exchange device is weakened, so the temperature difference between the two ends of the battery 3 is reduced.

[0142] With such configuration, the battery liquid cooling system in the battery cooling modes corresponding to Mode 7, Mode 8, Mode 9 and Mode 10 can avoid the reduction of energy efficiency of the battery 3 or damage to the battery 3 due to excessive temperature difference between the two ends of the battery 3.

[0143] In this embodiment, the control system 5 can be internally provided with a control panel according to actual needs, and the control method can be electrical connection or wireless control, etc. The specific control method is not limited here. The operator can control the opening and closing of the first cold source 1 and the second cold source 4, the flow direction of the flowing medium in the battery 3 and the valve position of the switching reversing valve device 2 according to the content of the control panel, so as to realize the switching of multiple battery cooling modes.

[0144] An embodiment of the present invention further provides a working machine, including a battery liquid cooling system, wherein the battery liquid cooling system is a battery liquid cooling system as described in any one of the above embodiments.

[0145] With such an arrangement, the operating machinery provided by the embodiment of the present invention can realize simultaneous cooling of the battery 3 by two cooling sources. By controlling the first refrigeration component, the second refrigeration component, the first drive component, the second drive component and the reversing valve device 2, the battery liquid cooling system can be suitable for the working conditions of cooling multiple batteries 3, and is suitable for low-temperature, normal-temperature and high-temperature battery 3 working environments. It can also meet the temperature control requirements of the battery 3 that needs rapid cooling due to fast charging or large-scale heat release; it also supports single cold source cooling and mixed cold source mixed cooling, covering multiple battery 3 cooling scenarios; it realizes the switching of forward and reverse flow directions of the battery 3 in multiple modes, which is conducive to ensuring the balanced and stable temperature of the battery 3; it can also ensure that in the case of an imbalance in the internal temperature of the battery 3, the refrigeration is stopped in time to prevent the battery 3 from being damaged.

[0146] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery liquid cooling system, It is characterized in that include: A battery (3) is provided with a heat exchange device, the heat exchange device comprising a first interface and a second interface; A first cold source (1), adapted to perform refrigeration and output cooling medium when the ambient temperature is lower than a first preset temperature, comprising a third interface and a fourth interface; A second cold source (4), adapted to perform refrigeration and output cooling medium when the ambient temperature is equal to or higher than the first preset temperature, comprising a fifth interface and a sixth interface; The reversing valve device (2) comprises a plurality of interfaces, and the plurality of interfaces are respectively connected to the first interface, the second interface, the third interface, the fourth interface, the fifth interface and the sixth interface in a one-to-one correspondence; wherein: The reversing valve device (2) is capable of switching between a first valve position, a second valve position, a third valve position and a fourth valve position. In the first valve position or the second valve position, the first cold source (1), the heat exchange device and the second cold source (4) are connected in series to form a first cooling circulation path, and when the first valve position is switched to the second valve position, the flow direction of the cooling medium in the heat exchange device is reversed; In the third valve position or the fourth valve position, the second cold source (4) is connected in series with the heat exchange device to form a second cooling circulation path, and when the third valve position is switched to the fourth valve position, the flow direction of the cooling medium in the heat exchange device is reversed; A control system (5) is electrically connected to the first cold source (1), the second cold source (4) and the reversing valve device (2), the control system (5) being used to control the opening and closing of the first cold source (1) and the second cold source (4), and the control system (5) being used to control the valve position switching of the reversing valve device (2); When the temperature difference between the two ends of the battery (3) is equal to or greater than a first preset temperature difference, the control system (5) controls the first cold source (1) and the second cold source (4) to be turned off, and the control system (5) controls the reversing valve device (2) to switch to the first valve position or the second valve position; When the temperature difference between the two ends of the battery (3) is greater than the second preset temperature difference and less than the first preset temperature difference, the control system (5) controls the first cold source (1) and the second cold source (4) to be turned off, and the control system (5) controls the reversing valve device (2) to switch to the third valve position or the fourth valve position.

2. The battery liquid cooling system according to claim 1, It is characterized in that When the ambient temperature is lower than the first preset temperature, and the temperature of the battery (3) is lower than the second preset temperature, the control system (5) controls the first cold source (1) to be turned on, the second cold source (4) to be turned off, and the control system (5) controls the reversing valve device (2) to be switched to the first valve position or the second valve position.

3. The battery liquid cooling system according to claim 1, It is characterized in that When the ambient temperature is equal to or higher than the first preset temperature, and the temperature of the battery (3) is lower than the second preset temperature, the control system (5) controls the first cold source (1) to be turned off, the second cold source (4) to be turned on, and the control system (5) controls the reversing valve device (2) to be switched to the third valve position or the fourth valve position.

4. The battery liquid cooling system according to claim 1, It is characterized in that When the temperature of the battery (3) is equal to or higher than a second preset temperature, the control system (5) controls the first cold source (1) and the second cold source (4) to be turned on, and the control system (5) controls the reversing valve device (2) to switch to the first valve position or the second valve position.

5. The battery liquid cooling system according to claim 1, It is characterized in that Also includes: A first temperature sensor, the first temperature sensor is used to sense the ambient temperature; A first temperature sensor component, the first temperature sensor component is used to sense the temperature of the battery (3); wherein, The first temperature sensor and the first temperature sensor assembly are both electrically connected to the control system (5).

6. The battery liquid cooling system according to claim 5, It is characterized in that The first temperature sensor assembly further comprises at least a plurality of second temperature sensors arranged at two ends of the battery (3), the second temperature sensors being used to sense the temperature at two ends of the battery (3); The control system (5) is electrically connected to a plurality of the second temperature sensors and is used to calculate the temperature difference between the two ends of the battery (3).

7. A working machine, It is characterized in that It comprises a battery liquid cooling system, wherein the battery liquid cooling system is the battery liquid cooling system according to any one of claims 1 to 6.

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