Battery pack temperature equalizing device and energy storage system

Abstract

The invention discloses a battery pack temperature equalizing device and an energy storage system. The battery pack temperature equalizing device comprises at least two liquid cooling plates, a control valve assembly, a control module and a driving assembly. The liquid cooling plate and the battery cell module are correspondingly arranged; the liquid cooling plate exchanges heat with the battery cell module; the driving assembly is connected with the control valve assembly and the control module. The driving assembly is used for driving the heat-conducting medium to circulate; the control valve assembly comprises at least two groups of interfaces and a plurality of valves; the liquid cooling plate is connected with an interface of the control valve assembly; the control valve assembly controls a circulation path of the heat-conducting medium through opening or closing of each valve so as to balance the temperature of the battery pack; all the valves and the battery cell modules are connected with the control module; and the control module is used for acquiring the module temperature of each battery cell module, controlling the opening or closing of each valve according to each module temperature, and controlling the circulation direction of the heat-conducting medium. According to the battery pack temperature balancing device, the temperature difference between the battery cell modules can be reduced, and the service life of the battery pack is prolonged.

Description

Technical Field

[0001] The present invention relates to the field of energy storage technology, and in particular to a battery pack temperature equalization device and an energy storage system. Background Art

[0002] At present, liquid cooling or liquid heating of battery packs generally uses profile cold plates, stamped cold plates, harmonica tube cold plates, etc., but no matter which solution is used, it is impossible to control the cooling or heating power of each battery module of the battery pack during use. The temperature consistency of each battery module inside the battery pack is poor, and the temperature difference between each battery module is high, which results in a short service life of the battery pack. Summary of the invention

[0003] The present invention provides a battery pack temperature equalization device and an energy storage system to reduce the temperature difference between each battery core module and increase the service life of the battery pack.

[0004] According to one aspect of the present invention, a battery pack temperature equalization device is provided, the battery pack comprising at least two battery cell modules, the battery pack temperature equalization device comprising: at least two liquid cooling plates, a control valve assembly, a control module and a drive assembly;

[0005] The liquid cooling plate is arranged in one-to-one correspondence with the battery module; the liquid cooling plate is used to exchange heat for the battery module; the driving component is respectively connected to the control valve component and the control module; the driving component is used to drive the heat-conducting medium to circulate in the liquid cooling plate and the control valve component;

[0006] The control valve assembly includes at least two groups of interfaces and a plurality of valves; the liquid cooling plate is connected to the control valve assembly through the interfaces; the control valve assembly controls the circulation path of the heat transfer medium by opening or closing each of the valves to balance the temperature of the battery pack;

[0007] Each valve in the control valve assembly and the battery cell module are connected to the control module; the control module is used to obtain the module temperature of each battery cell module, control the opening or closing of each valve according to the module temperature, and control the circulation direction of the heat transfer medium.

[0008] Optionally, the number of the liquid cooling plates is the same as the number of interfaces of the control valve assembly.

[0009] Optionally, the control valve assembly has three groups of interfaces; one group of interfaces of the control valve assembly includes two connection ports; the control valve assembly includes: a first valve, a second valve, a third valve, a fourth valve, a fifth valve, a sixth valve, a seventh valve, an eighth valve, a ninth valve, a tenth valve, an eleventh valve, a twelfth valve, a thirteenth valve, a fourteenth valve, a fifteenth valve and a sixteenth valve;

[0010] The first end of the first valve is connected to the driving assembly; the second end of the first valve is connected to the first liquid cooling plate as the first connection port of the first group of interfaces; the first end of the second valve is connected to the first liquid cooling plate as the second connection port of the first group of interfaces; the first end of the third valve is connected to the driving assembly; the second end of the third valve is connected to the first end of the fourth valve; the second end of the fourth valve is connected to the second liquid cooling plate as the first connection port of the second group of interfaces; the first end of the fifth valve is connected to the second liquid cooling plate as the second connection port of the second group of interfaces; the second end of the fifth valve is connected to the first end of the sixth valve; the second end of the sixth valve is connected to the driving assembly; the first end of the seventh valve is connected to the driving assembly; the second end of the seventh valve is connected to the third liquid cooling plate as the first connection port of the third group of interfaces; the first end of the eighth ... first end of the fourth valve The second connection port of the third group of interfaces is connected to the third liquid cooling plate; the second end of the eighth valve is connected to the driving assembly; the ninth valve is connected between the second end of the first valve and the second end of the fourth valve; the tenth valve is connected between the second end of the fourth valve and the second end of the seventh valve; the eleventh valve is connected between the first end of the second valve and the first end of the fifth valve; the twelfth valve is connected between the first end of the fifth valve and the first end of the eighth valve; the thirteenth valve is connected between the first end of the first valve and the second end of the fifth valve; the fourteenth valve is connected between the first end of the second valve and the second end of the seventh valve; the fifteenth valve is connected between the first end of the fourth valve and the second end of the sixth valve; the sixteenth valve is connected between the second section of the seventh valve and the second end of the eighth valve;

[0011] The control end of the first valve, the control end of the second valve, the control end of the third valve, the control end of the fourth valve, the control end of the fifth valve, the control end of the sixth valve, the control end of the seventh valve, the control end of the eighth valve, the control end of the ninth valve, the control end of the tenth valve, the control end of the eleventh valve, the control end of the twelfth valve, the control end of the thirteenth valve, the control end of the fourteenth valve, the control end of the fifteenth valve and the control end of the sixteenth valve are all connected to the control module.

[0012] Optionally, the valve comprises a solenoid valve or a pneumatic valve.

[0013] Optionally, the driving assembly comprises: a driving unit and a reversing unit;

[0014] The first end of the reversing unit is connected to the first end of the control valve assembly; the second end of the reversing unit is connected to the second end of the control valve assembly; the third end of the reversing unit is connected to the first end of the driving unit; the fourth end of the reversing unit is connected to the second end of the driving unit;

[0015] The driving unit is used to drive the heat exchange medium to circulate; the reversing unit is used to change the circulation direction of the heat exchange medium.

[0016] Optionally, the reversing unit includes: a first reversing valve, a second reversing valve, a third reversing valve and a fourth reversing valve;

[0017] The first end of the first reversing valve is connected to the control valve assembly; the second end of the first reversing valve is connected to the first end of the drive unit; the first end of the second reversing valve is connected to the control valve assembly; the second end of the second reversing valve is connected to the first end of the drive unit; the first end of the third reversing valve is connected to the second end of the drive unit; the second end of the third reversing valve is connected to the first end of the second reversing valve; the first end of the fourth reversing valve is connected to the second end of the drive unit; the second end of the fourth reversing valve is connected to the first end of the first reversing valve; the control end of the first reversing valve, the control end of the second reversing valve, the control end of the third reversing valve and the control end of the fourth reversing valve are all connected to the control module.

[0018] Optionally, the driving unit includes: a circulation pump.

[0019] Optionally, it also includes: a heat exchange module;

[0020] The first end of the control valve assembly is connected to the first end of the drive assembly; the first end of the heat exchange module is connected to the second end of the control valve assembly; the second end of the heat exchange module is connected to the second end of the drive assembly; the control end of the heat exchange module is connected to the control module;

[0021] The heat exchange module is used to heat or dissipate heat for the heat conducting medium.

[0022] Optionally, the heat exchange module includes: a heating component and a heat release component;

[0023] The heating component is connected between the control valve component and the driving component; the heat release component is connected in parallel with the heating component;

[0024] The heating component is used to heat the heat-conducting medium; the heat-releasing component is used to release the heat in the heat-conducting medium.

[0025] According to another aspect of the present invention, there is further provided an energy storage system, which includes the battery pack temperature equalization device described in any one of the above embodiments.

[0026] The control module of the embodiment of the present invention obtains the module temperature of each battery cell module in the battery pack, and controls the circulation path of the heat-conducting medium in the control valve assembly according to the module temperature of each battery cell module, so that the heat-conducting medium circulates in different liquid cooling plates, and the heat of the high-temperature battery cell module is transferred to the low-temperature battery cell module through the liquid cooling plate, so as to achieve temperature balance of each battery cell module in the battery pack. The embodiment of the present invention controls the circulation path of the heat-conducting medium through the control valve assembly, so that the heat-conducting medium circulates in different liquid cooling plates, which is conducive to balancing the temperature of each battery cell module in the battery pack, reducing the temperature difference between each battery cell module, and improving the service life of the battery pack.

[0027] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0029] Figure 1 is a schematic diagram of a battery pack temperature equalization device provided by an embodiment of the present invention;

[0030] Figure 2 is a schematic diagram of a battery pack temperature equalization device provided by an embodiment of the present invention;

[0031] Figure 3 is a schematic diagram of another battery pack temperature equalization device provided by an embodiment of the present invention;

[0032] Figure 4 is a schematic diagram of another battery pack temperature equalization device provided by an embodiment of the present invention;

[0033] Figure 5 is a schematic diagram of another battery pack temperature equalization device provided by an embodiment of the present invention;

[0034] Figure 6 It is a schematic diagram of an energy storage system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only 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 should fall within the scope of protection of the present invention.

[0036] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0037] The embodiment of the present invention provides a battery pack temperature balancing device. The battery pack temperature balancing device is suitable for use in a battery pack or energy storage system to balance the temperature of each battery cell module in the battery pack or energy storage system, reduce the temperature difference between each battery cell module, and increase the service life of the battery pack. Figure 1 Schematic diagram of a battery pack temperature equalization device provided by an embodiment of the present invention. The battery pack includes at least two battery cell modules ( Figure 1 not shown), refer to Figure 1 The battery pack temperature equalization device includes: at least two liquid cooling plates 110, a control valve assembly 120, a control module 130 and a drive assembly 140.

[0038] The liquid cooling plate 110 is arranged in one-to-one correspondence with the battery module; the liquid cooling plate 110 is used to exchange heat for the battery module; the driving assembly 140 is respectively connected to the control valve assembly 120 and the control module 130; the driving assembly 140 is used to drive the heat transfer medium to circulate in the liquid cooling plate 110 and the control valve assembly 120; the control valve assembly 120 includes at least two groups of interfaces and multiple valves; the liquid cooling plate 110 is connected to the control valve assembly 120 through the interface; the control valve assembly 120 controls the circulation path of the heat transfer medium by opening or closing each valve to balance the temperature of the battery pack; each valve and battery module in the control valve assembly 120 are connected to the control module 130; the control module 130 is used to obtain the module temperature of each battery module, control the opening or closing of each valve according to the temperature of each module, and control the circulation direction of the heat transfer medium. Among them, the number of interfaces of the control valve assembly 120 is the same as the number of the liquid cooling plate 110, and each liquid cooling plate 110 is connected to each interface of the control valve assembly 120 in one-to-one correspondence.

[0039] Specifically, the control module 130 obtains the temperature of each battery cell module, that is, the module temperature, and determines the temperature consistency of each battery cell module in the battery pack according to the temperature of each module. Exemplarily, when the temperature difference between the battery cell module with the highest temperature and the battery cell module with the lowest temperature in the battery pack exceeds the preset temperature difference threshold, the control module 130 adjusts the opening and closing of each valve in the control valve assembly 120, thereby changing the circulation path of the heat-conducting medium in the control valve assembly 120, so that the heat-conducting medium circulates in the liquid cooling plate related to the above-mentioned battery cell modules. At this time, the battery cell module with the highest temperature transfers heat to the heat-conducting medium through the liquid cooling plate attached to it; under the drive of the drive assembly 140, the heat-conducting medium transfers heat to the liquid cooling plate attached to the battery cell module with the lowest temperature, and the heat-conducting medium transfers heat to the battery cell module with the lowest temperature through the liquid cooling plate. The control module 130 continuously obtains the module temperature of each battery module, and continuously changes the circulation path of the heat-conducting medium according to the module temperature, thereby reducing the temperature difference of each battery module in the battery pack. It should be noted that the preset temperature difference threshold is the maximum temperature difference value of the battery module set in advance, which can be set according to actual needs in actual application, and this embodiment does not limit this. Among them, the mutual combination of multiple valves in the control valve assembly 120 can form multiple circulation paths, so that each liquid cooling plate 110 can operate independently, or can operate in series or in parallel with each other.

[0040] The driving component 140 can also control the circulation direction of the heat-conducting medium so that the heat-conducting medium can flow in both directions, thereby avoiding the heat exchange power of the heat-conducting medium gradually decreasing in each liquid cooling plate 110 when the heat-conducting medium flows in one direction, thereby further balancing the temperature of each battery cell module in the battery pack.

[0041] When each liquid cooling plate 110 operates in parallel or individually, the heat-conducting medium exchanges the heat generated by the battery cell module to the outside. At this time, the control module 130 monitors the temperature of the battery cell module. When the temperature of the battery cell module drops to a preset temperature, the control module 130 cuts off the passage to the liquid cooling plate corresponding to the battery cell module, thereby terminating the heat exchange between the heat-conducting medium and the battery cell module, thereby ensuring that the operating temperature of the battery cell module is always within an appropriate temperature range. It should be noted that the preset temperature is a pre-set minimum temperature suitable for the battery cell module to operate. The preset temperature can be set according to the characteristics of the battery cell module, and this embodiment does not limit this.

[0042] The control module 130 of the embodiment of the present invention obtains the module temperature of each battery cell module in the battery pack, and controls the circulation path of the heat-conducting medium in the control valve assembly 120 according to the module temperature of each battery cell module, so that the heat-conducting medium circulates in different liquid cooling plates 110, so as to transfer the heat of the high-temperature battery cell module to the low-temperature battery cell module through the liquid cooling plate 110, and realize the temperature balance of each battery cell module in the battery pack. The embodiment of the present invention controls the circulation path of the heat-conducting medium through the control valve assembly 120, so that the heat-conducting medium circulates in different liquid cooling plates 110, which is conducive to balancing the temperature of each battery cell module in the battery pack, reducing the temperature difference between each battery cell module, and improving the service life of the battery pack.

[0043] Figure 2 is a schematic diagram of a battery pack temperature balancing device provided by an embodiment of the present invention. Based on the above embodiments, optionally, refer to Figure 2 The control valve assembly 120 has three groups of interfaces; one group of interfaces of the control valve assembly 120 includes two connection ports; Figure 1 and Figure 2 The control valve assembly 120 includes: a first valve V1, a second valve V2, a third valve V3, a fourth valve V4, a fifth valve V5, a sixth valve V6, a seventh valve V7, an eighth valve V8, a ninth valve V9, a tenth valve V10, an eleventh valve V11, a twelfth valve V12, a thirteenth valve V13, a fourteenth valve V14, a fifteenth valve V15 and a sixteenth valve V16.

[0044] The first end of the first valve V1 is connected to the driving assembly 140; the second end of the first valve V1 is connected to the first liquid cooling plate 110 as the first connection port A1 of the first group of interfaces; the first end of the second valve V2 is connected to the first liquid cooling plate 110 as the second connection port A2 of the first group of interfaces; the first end of the third valve V3 is connected to the driving assembly 140; the second end of the third valve V3 is connected to the first end of the fourth valve V4; the second end of the fourth valve V4 is connected to the second liquid cooling plate 110 as the first connection port B1 of the second group of interfaces; the first end of the fifth valve V5 is connected to the second liquid cooling plate 110 as the second connection port B2 of the second group of interfaces; the second end of the fifth valve V5 is connected to the first end of the sixth valve V6; the second end of the sixth valve V6 is connected to the driving assembly 140; the first end of the seventh valve V7 is connected to the driving assembly 140; the second end of the seventh valve V7 is connected to the third liquid cooling plate 110 as the first connection port C1 of the third group of interfaces; the eighth valve V8 The first end is connected to the third liquid cooling plate 110 as the second connection port C2 of the third group interface; the second end of the eighth valve V8 is connected to the driving assembly 140; the ninth valve V9 is connected between the second end of the first valve V1 and the second end of the fourth valve V4; the tenth valve V10 is connected between the second end of the fourth valve V4 and the second end of the seventh valve V7; the eleventh valve V11 is connected between the first end of the second valve V2 and the first end of the fifth valve V5; the twelfth valve V12 is connected between the first end of the fifth valve V5 and the first end of the eighth valve V8; the thirteenth valve V13 is connected between the first end of the first valve V1 and the second end of the fifth valve V5; the fourteenth valve V14 is connected between the first end of the second valve V2 and the second end of the seventh valve V7; the fifteenth valve V15 is connected between the first end of the fourth valve V4 and the second end of the sixth valve V6; the sixteenth valve V16 is connected between the second section of the seventh valve V7 and the second end of the eighth valve V8.

[0045] The control end of the first valve V1, the control end of the second valve V2, the control end of the third valve V3, the control end of the fourth valve V4, the control end of the fifth valve V5, the control end of the sixth valve V6, the control end of the seventh valve V7, the control end of the eighth valve V8, the control end of the ninth valve V9, the control end of the tenth valve V10, the control end of the eleventh valve V11, the control end of the twelfth valve V12, the control end of the thirteenth valve V13, the control end of the fourteenth valve V14, the control end of the fifteenth valve V15 and the control end of the sixteenth valve V16 are all connected to the control module 130.

[0046] Specifically, combined Figure 2 The following lists the control methods of the control valve assembly 120 to realize the individual operation, series operation or parallel operation of each liquid cooling plate in the case of three liquid cooling plates 110:

[0047] Only the first valve V1 and the second valve V2 are opened, and the rest are closed, then the first liquid cooling plate circulates alone; only the third valve V3, the fourth valve V4, the fifth valve V5 and the sixth valve V6 are opened, and the rest are closed, then the second liquid cooling plate circulates alone; only the seventh valve V7 and the eighth valve V8 are opened, and the rest are closed, then the third liquid cooling plate circulates alone; open the first valve V1, the eleventh valve V11, the fourth valve V4 and the fifteenth valve V15, and the rest are closed, then the first liquid cooling plate and the second liquid cooling plate circulate in series; open the first valve V1, the second valve V2, the third valve V3, the fourth valve V4, the fifth valve V5 and the sixth valve V6, and the rest are closed, then the first liquid cooling plate and the second liquid cooling plate circulate in parallel; open the first valve V1, the fourteenth valve V14 and the eighth valve V8, and the rest are closed, then the first liquid cooling plate and the third liquid cooling plate circulate in series; open the first valve V1, the second valve V2, the seventh valve V7 and the eighth valve V8, and the rest are closed, then the first liquid cooling plate and the third liquid cooling plate are circulated in parallel; the fourth valve V4, the twelfth valve V12, the third valve V3 and the sixteenth valve V16 are opened, and the rest are closed, then the second liquid cooling plate and the third liquid cooling plate are circulated in series; the third valve V3, the fourth valve V4, the fifth valve V5, the sixth valve V6, the seventh valve V7 and the eighth valve V8 are opened, and the rest are closed, then the second liquid cooling plate and the third liquid cooling plate are circulated in parallel; the first valve V1, the eleventh valve V11, the tenth valve V10 and the eighth valve V8 are opened, and the rest are closed, then the first liquid cooling plate, the second liquid cooling plate and the third liquid cooling plate are circulated in series; the first valve V1, the second valve V2, the third valve V3, the fourth valve V4, the fifth valve V5, the sixth valve V6, the seventh valve V7 and the eighth valve V8 are opened, and the rest are closed, then the first liquid cooling plate, the second liquid cooling plate and the third liquid cooling plate are circulated in parallel.

[0048] Based on the above embodiments, the valve may optionally include a solenoid valve or a pneumatic valve. Specifically, the solenoid valve is a fluid control device that attracts or pushes the valve core to move through a magnetic field; the pneumatic valve is a device that uses compressed air as a power source to drive the valve stem to move, thereby achieving control of the fluid in the pipeline.

[0049] Figure 3 is a schematic diagram of another battery pack temperature balancing device provided by an embodiment of the present invention. Based on the above embodiments, optionally, refer to Figure 3 The driving component 140 includes: a driving unit 141 and a reversing unit 142 .

[0050] The first end of the reversing unit 142 is connected to the first end of the control valve assembly 120; the second end of the reversing unit 142 is connected to the second end of the control valve assembly 120; the third end of the reversing unit 142 is connected to the first end of the driving unit 141; the fourth end of the reversing unit 142 is connected to the second end of the driving unit 141; the driving unit 141 is used to drive the heat exchange medium to circulate; the reversing unit 142 is used to change the circulation direction of the heat exchange medium.

[0051] Specifically, the reversing unit 142 reverses the circulation of the heat-conducting medium flowing out of the driving unit 141, so that the heat-conducting medium can circulate in both directions. Exemplarily, the reversing unit 142 may include a plurality of valves, and the reversing unit 142 changes the flow path of the heat-conducting medium by opening or closing each valve, that is, changes the circulation direction of the heat-conducting medium, so that the heat-conducting medium can circulate in both directions.

[0052] Based on the above embodiments, optionally, continue to refer to Figure 3 The reversing unit 142 includes: a first reversing valve V17, a second reversing valve V18, a third reversing valve V19 and a fourth reversing valve V20.

[0053] A first end of the first reversing valve V17 is connected to the control valve assembly 120; a second end of the first reversing valve V17 is connected to a first end of the driving unit 141; a first end of the second reversing valve V18 is connected to the control valve assembly 120; a second end of the second reversing valve V18 is connected to a first end of the driving unit 141; a first end of the third reversing valve V19 is connected to a second end of the driving unit 141; a second end of the third reversing valve V19 is connected to a first end of the second reversing valve V18; a first end of the fourth reversing valve V20 is connected to a second end of the driving unit 141; a second end of the fourth reversing valve V20 is connected to a first end of the first reversing valve V17; a control end of the first reversing valve V17, a control end of the second reversing valve V18, a control end of the third reversing valve V19 and a control end of the fourth reversing valve V120 are all connected to the control module 130.

[0054] Specifically, when the first reversing valve V17 and the third reversing valve V19 are opened and the second reversing valve V18 and the fourth reversing valve V20 are closed, the heat transfer medium circulates clockwise under the drive of the driving unit 141; when the second reversing valve V18 and the fourth reversing valve V20 are opened and the first reversing valve V17 and the third reversing valve V19 are closed, the heat transfer medium circulates clockwise and reversely under the drive of the driving unit 141.

[0055] Based on the above embodiments, the driving unit 141 may optionally include: a circulation pump. Specifically, the circulation pump is a device for causing liquid to circulate in a closed loop. The working principle of the circulation pump is to drive the impeller to rotate through a motor to generate centrifugal force, suck the liquid into the pump body and discharge it after pressurization, thereby promoting the circulation of the liquid.

[0056] Figure 4 is a schematic diagram of another battery pack temperature balancing device provided by an embodiment of the present invention. Based on the above embodiments, optionally, refer to Figure 4 The battery pack temperature equalization device also includes: a heat exchange module 150.

[0057] The first end of the control valve assembly 120 is connected to the first end of the drive assembly 140; the first end of the heat exchange module 150 is connected to the second end of the control valve assembly 120; the second end of the heat exchange module 150 is connected to the second end of the drive assembly 140; the control end of the heat exchange module 150 is connected to the control module 130; the heat exchange module 150 is used to heat or dissipate heat for the heat transfer medium.

[0058] Specifically, when the module temperature of the battery module exceeds the preset high temperature threshold or falls below the preset low temperature threshold, the heat exchange module 150 assists in heat dissipation or heating of the heat transfer medium, thereby improving the heat exchange efficiency between the heat transfer medium and the outside world, which is conducive to quickly increasing or reducing the temperature of each battery module, and quickly balancing the temperature of each battery module in the battery pack. It should be noted that the preset high temperature threshold is a pre-set threshold temperature for determining whether the heat exchange module 150 performs auxiliary heat dissipation; the preset low temperature threshold is a pre-set threshold temperature for determining whether the heat exchange module 150 performs auxiliary heating; the preset high temperature threshold and the preset low temperature threshold can be set according to actual conditions, and this embodiment does not limit this.

[0059] Figure 5 is a schematic diagram of another battery pack temperature balancing device provided by an embodiment of the present invention. Based on the above embodiments, optionally, refer to Figure 5 The heat exchange module 150 includes: a heating component 151 and a heat release component 152 .

[0060] The heating component 151 is connected between the control valve component 120 and the driving component 140; the heat releasing component 152 is connected in parallel with the heating component 151; the heating component 151 is used to heat the heat conducting medium; and the heat releasing component 152 is used to release the heat in the heat conducting medium.

[0061] Specifically, when the module temperature of the battery cell module falls below the preset low temperature threshold, the heating component 151 assists in heating the heat-conducting medium to quickly increase the temperature of each battery cell module; when the module temperature of the battery cell module exceeds the preset high temperature threshold, the heat-dissipating component 152 assists in dissipating the heat-conducting medium to quickly reduce the temperature of each battery cell module.

[0062] An embodiment of the present invention also provides an energy storage system. Figure 6 Schematic diagram of an energy storage system provided by an embodiment of the present invention. Figure 6 The energy storage system 10 includes the battery pack temperature balancing device 20 provided in any of the above embodiments. The energy storage system 10 provided in this embodiment has the beneficial effects of the battery pack temperature balancing device 20 provided in any of the above embodiments, which will not be described in detail here.

[0063] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0064] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery pack temperature equalization device, characterized in that: The battery pack includes at least two battery cell modules, and the battery pack temperature equalization device includes: at least two liquid cooling plates, a control valve assembly, a control module and a drive assembly; The liquid cooling plate is arranged in one-to-one correspondence with the battery module; the liquid cooling plate is used to exchange heat for the battery module; the driving component is respectively connected to the control valve component and the control module; the driving component is used to drive the heat-conducting medium to circulate in the liquid cooling plate and the control valve component; The control valve assembly includes at least two groups of interfaces and a plurality of valves; the liquid cooling plate is connected to the control valve assembly through the interfaces; the control valve assembly controls the circulation path of the heat transfer medium by opening or closing each of the valves to balance the temperature of the battery pack; Each valve in the control valve assembly and the battery cell module are connected to the control module; the control module is used to obtain the module temperature of each battery cell module, control the opening or closing of each valve according to the module temperature, and control the circulation direction of the heat transfer medium.

2. The battery pack temperature equalization device according to claim 1, characterized in that: The number of the liquid cooling plates is the same as the number of interfaces of the control valve assembly.

3. The battery pack temperature equalization device according to claim 2, characterized in that: The control valve assembly has three groups of interfaces; one group of interfaces of the control valve assembly includes two connection ports; the control valve assembly includes: a first valve, a second valve, a third valve, a fourth valve, a fifth valve, a sixth valve, a seventh valve, an eighth valve, a ninth valve, a tenth valve, an eleventh valve, a twelfth valve, a thirteenth valve, a fourteenth valve, a fifteenth valve and a sixteenth valve; The first end of the first valve is connected to the driving assembly; the second end of the first valve is connected to the first liquid cooling plate as the first connection port of the first group of interfaces; the first end of the second valve is connected to the first liquid cooling plate as the second connection port of the first group of interfaces; the first end of the third valve is connected to the driving assembly; the second end of the third valve is connected to the first end of the fourth valve; the second end of the fourth valve is connected to the second liquid cooling plate as the first connection port of the second group of interfaces; the first end of the fifth valve is connected to the second liquid cooling plate as the second connection port of the second group of interfaces; the second end of the fifth valve is connected to the first end of the sixth valve; the second end of the sixth valve is connected to the driving assembly; the first end of the seventh valve is connected to the driving assembly; the second end of the seventh valve is connected to the third liquid cooling plate as the first connection port of the third group of interfaces; the first end of the eighth ... first end of the fourth valve The second connection port of the third group of interfaces is connected to the third liquid cooling plate; the second end of the eighth valve is connected to the driving assembly; the ninth valve is connected between the second end of the first valve and the second end of the fourth valve; the tenth valve is connected between the second end of the fourth valve and the second end of the seventh valve; the eleventh valve is connected between the first end of the second valve and the first end of the fifth valve; the twelfth valve is connected between the first end of the fifth valve and the first end of the eighth valve; the thirteenth valve is connected between the first end of the first valve and the second end of the fifth valve; the fourteenth valve is connected between the first end of the second valve and the second end of the seventh valve; the fifteenth valve is connected between the first end of the fourth valve and the second end of the sixth valve; the sixteenth valve is connected between the second section of the seventh valve and the second end of the eighth valve; The control end of the first valve, the control end of the second valve, the control end of the third valve, the control end of the fourth valve, the control end of the fifth valve, the control end of the sixth valve, the control end of the seventh valve, the control end of the eighth valve, the control end of the ninth valve, the control end of the tenth valve, the control end of the eleventh valve, the control end of the twelfth valve, the control end of the thirteenth valve, the control end of the fourteenth valve, the control end of the fifteenth valve and the control end of the sixteenth valve are all connected to the control module.

4. The battery pack temperature equalization device according to claim 3, characterized in that: The valve comprises a solenoid valve or a pneumatic valve.

5. The battery pack temperature equalization device according to claim 1, characterized in that: The driving assembly comprises: a driving unit and a reversing unit; The first end of the reversing unit is connected to the first end of the control valve assembly; the second end of the reversing unit is connected to the second end of the control valve assembly; the third end of the reversing unit is connected to the first end of the driving unit; the fourth end of the reversing unit is connected to the second end of the driving unit; The driving unit is used to drive the heat exchange medium to circulate; the reversing unit is used to change the circulation direction of the heat exchange medium.

6. The battery pack temperature equalization device according to claim 5, characterized in that: The reversing unit comprises: a first reversing valve, a second reversing valve, a third reversing valve and a fourth reversing valve; The first end of the first reversing valve is connected to the control valve assembly; the second end of the first reversing valve is connected to the first end of the drive unit; the first end of the second reversing valve is connected to the control valve assembly; the second end of the second reversing valve is connected to the first end of the drive unit; the first end of the third reversing valve is connected to the second end of the drive unit; the second end of the third reversing valve is connected to the first end of the second reversing valve; the first end of the fourth reversing valve is connected to the second end of the drive unit; the second end of the fourth reversing valve is connected to the first end of the first reversing valve; the control end of the first reversing valve, the control end of the second reversing valve, the control end of the third reversing valve and the control end of the fourth reversing valve are all connected to the control module.

7. The battery pack temperature equalization device according to claim 5, characterized in that: The driving unit comprises: a circulation pump.

8. The battery pack temperature equalization device according to any one of claims 1 to 7, characterized in that: Also includes: Heat exchange module; The first end of the control valve assembly is connected to the first end of the drive assembly; the first end of the heat exchange module is connected to the second end of the control valve assembly; the second end of the heat exchange module is connected to the second end of the drive assembly; the control end of the heat exchange module is connected to the control module; The heat exchange module is used to heat or dissipate heat for the heat conducting medium.

9. The battery pack temperature equalization device according to claim 8, characterized in that: The heat exchange module comprises: a heating component and a heat release component; The heating component is connected between the control valve component and the driving component; the heat release component is connected in parallel with the heating component; The heating component is used to heat the heat-conducting medium; the heat-releasing component is used to release the heat in the heat-conducting medium.

10. An energy storage system, characterized in that: Comprising a battery pack temperature equalization device as described in any one of claims 1-9.

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