Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a side view of a liquid-cooled energy storage battery cluster of the present application;
FIG. 2 is an elevation view of a liquid-cooled energy storage battery cluster of the present application;
fig. 3 is a schematic diagram of a liquid cooling circuit in a liquid cooling energy storage battery cluster in the present application.
In fig. 1-3, 01, battery rack, 02, battery PACK, 03, high-pressure tank, 04, water outlet pipeline, 05, water inlet pipeline, 021, battery PACK negative pole outlet, 022, battery PACK positive pole outlet, 023, battery PACK disconnection switch, 024, battery PACK explosion-proof valve, 025, battery PACK fire-fighting interface, 026, battery PACK low-pressure interface, 027, battery PACK water inlet, 028, battery PACK water outlet, 031, high-pressure tank battery positive pole, 032, high-pressure tank battery negative pole, 033, high-pressure tank status indicator lamp, 034, high-pressure tank manual switch, 035, high-pressure tank low-pressure port, 036, high-pressure tank p+,037, high-pressure tank P-,041, water outlet main pipeline, 042, water outlet branch pipeline, 051, water inlet main pipeline,
052. inlet tube discharge valve 053, inlet branch pipeline, 054, inlet tube stop valve, 055, branch connection, 056, tee bend connecting pipe.
Detailed Description
Embodiments of the present application are described in detail below with reference to the accompanying drawings.
Other advantages and effects of the present application will become apparent to those skilled in the art from the present disclosure, when the following description of the embodiments is taken in conjunction with the accompanying drawings. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. The present application may be embodied or carried out in other specific embodiments, and the details of the present application may be modified or changed from various points of view and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
It is noted that various aspects of the embodiments are described below within the scope of the following claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is merely illustrative. Based on the present application, one skilled in the art will appreciate that one aspect described herein may be implemented independently of any other aspect, and that two or more of these aspects may be combined in various ways. For example, apparatus may be implemented and/or methods practiced using any number and aspects set forth herein. In addition, such apparatus may be implemented and/or such methods practiced using other structure and/or functionality in addition to one or more of the aspects set forth herein.
It should also be noted that the illustrations provided in the following embodiments merely illustrate the basic concepts of the application by way of illustration, and only the components related to the application are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complicated.
In addition, in the following description, specific details are provided in order to provide a thorough understanding of the examples. However, it will be understood by those skilled in the art that the present utility model may be practiced without these specific details.
The main factors of the performance and the service life of the battery energy storage system are temperature control in the battery operation process, such as thermal runaway of the battery possibly caused by overheat of the working temperature, reduced discharge efficiency caused by low environment, capacity attenuation of the battery monomer caused by uneven temperature among the batteries, and the like. The cooling mode of the prior art energy storage battery cluster is mainly air cooling, namely air is used as a heat exchange medium, heat exchange between a battery cell and an operating environment is realized through an air duct and an air conditioner configured by an energy storage system, but the air cooling has postponement property, low cooling speed and low heat dissipation efficiency on heat dissipation and cooling of the cell, and under the condition of a large cell, the large cell is thick, a heat conduction path is long, heat dissipation is difficult to realize, the cell is easy to bulge, after the bulge, the air cooling efficiency is reduced again due to the compression air cooling channel of the cell, the problem of uneven overall temperature distribution of the cell and a battery pack occurs, and further, the cell is easy to be out of control, raw materials in the cell are decomposed and the cell is accelerated to lose efficacy, and the safety of the whole battery pack and even the whole energy storage system is endangered.
Based on this, the embodiment of the present specification proposes a processing scheme of a liquid-cooled energy storage battery cluster: as shown in fig. 1-3, the liquid-cooled energy storage battery cluster comprises a high-voltage tank 03, a battery pack 02 and a liquid-cooled pipeline. The liquid cooling pipeline comprises a liquid cooling water outlet pipeline 04 and a liquid cooling water inlet pipeline 05, and specifically comprises a water inlet main pipeline 051, a water outlet main pipeline 041, a water inlet branch pipeline 053 and a water outlet branch pipeline 042. The high-voltage box 03 and the plurality of battery packs 02 are arranged in the battery frame 01, the high-voltage box 03 is arranged at the upper ends of the plurality of battery packs 02, the positive and negative poles of each battery pack 02 which are connected in series through connecting wires are respectively connected with the positive and negative poles of the battery of the high-voltage box, and direct current is output through the high-voltage box P+ and the high-voltage box P-through an internal protection device (not shown) of the high-voltage box.
The water inlet branch pipeline 053 and the water outlet branch pipeline 042 corresponding to the number of the battery packs are arranged, one ends of the water inlet branch pipeline 053 and the water outlet branch pipeline 042 are respectively connected with the water inlet main pipeline 051 and the water outlet main pipeline 041, the other ends of the water inlet branch pipeline 053 and the water outlet main pipeline 041 are correspondingly connected with the water inlets 027 and the water outlets 028 of the battery packs, and heat exchange is carried out on the battery packs through cooling mediums which circulate in and out in the liquid cooling pipelines.
In some embodiments, a multi-runner of cooling medium is arranged in the battery pack, and the cooling medium takes away redundant heat of the battery after circularly entering and exiting from a water inlet and a water outlet of the battery pack, so that heat exchange of the battery pack is realized by adopting the cooling medium circularly entering and exiting through the integral structure.
According to the liquid cooling energy storage battery cluster integral heat exchange structure, the heat exchange temperature difference is controlled within 5 ℃, the battery cycle life is about 6000-8000 times, compared with the prior art, the heat exchange temperature difference is about 8 ℃, the battery cycle life is about 4000-5000 times, the heat exchange effect is greatly improved, and the service life of the battery cluster is prolonged. And compared with air cooling, the heat exchange energy consumption of the liquid cooling energy storage battery cluster is reduced by 1% -2%, so that the liquid cooling energy storage battery cluster has better economic benefit.
The following describes the technical solutions provided by the embodiments of the present application with reference to the accompanying drawings.
As shown in fig. 1-3, the battery cluster is the lowest, individually operable unit in the energy storage system. The liquid cooling energy storage battery cluster comprises a high-voltage box, a battery pack, a liquid cooling pipeline, a cooling medium, a high-voltage connecting wire, a low-voltage connecting wire and the like. The high-voltage box is arranged at the upper ends of a plurality of stacked battery packs, after each battery pack is connected in series through a high-voltage and low-voltage wire harness, a battery pack positive electrode outlet 022 is connected with a high-voltage box battery positive electrode 031, a battery pack negative electrode outlet 021 is connected with a high-voltage box battery negative electrode 032, and direct current is output through a protection device in the high-voltage box. The liquid cooling pipeline comprises a water inlet main pipeline 051 and a water outlet main pipeline 041, a water inlet branch pipeline 053 and a water outlet branch pipeline 042 corresponding to the number of the battery packs are arranged, one end of each water inlet branch pipeline 053 and one end of each water outlet branch pipeline 042 are respectively connected with the water inlet main pipeline 051 and the water outlet main pipeline 041 correspondingly, and the other end of each water inlet branch pipeline 053 and one end of each water outlet branch pipeline 042 are connected with a water inlet 027 and a water outlet 028 of each battery pack correspondingly. In the embodiment of the specification, the heat exchange is performed on the battery pack through the cooling medium which is circulated in and out of the liquid cooling pipeline. The stacking of the plurality of battery packs is not limited to the example of fig. 1, and in some embodiments, the plurality of battery packs are stacked in parallel in a horizontal plane, and the plurality of battery packs are specifically arranged according to practical situations in a vertical direction according to stacked battery packs and the like. In some embodiments, a high-voltage box may be disposed at the lower end of each stacked battery pack, and the high-voltage box and the battery packs are disposed in the battery frame 01.
In some embodiments, the cooling medium has a specific heat capacity of 3300J/Kg, a thermal conductivity of 0.384W/m, and air has a specific heat capacity of 1003J/Kg, a thermal conductivity of 0.023W/m. The specific heat capacity of the cooling liquid is 3 times that of air, and the heat conductivity coefficient is 16 times that of air. The liquid cooling system of the embodiment of the specification has high overall heat exchange efficiency, and can reduce the power consumption of the whole station by about 1-2% after being combined into the energy storage power station, thereby saving the energy consumption and realizing better benefits.
In some embodiments, the water inlet main pipeline and the water outlet main pipeline are vertically arranged at one side of the high-pressure tank and the battery pack, and the water inlet branch pipeline and the water outlet branch pipeline are arranged around the battery pack; the connecting wires of the battery packs are sequentially arranged on the other side of the battery packs side by side. One side comprises front, back, left, right and the like, which side can be determined according to specific conditions, and the other side corresponds to one side.
As shown in fig. 1 and 3, the water inlet main pipe 051 and the water outlet main pipe 041 are vertically disposed at one side, such as the right side, of the high pressure tank 03 and the battery pack 02. The water inlet branch pipeline 053 and the water outlet branch pipeline 042 are arranged around the battery pack; the connecting wires of each battery pack are sequentially arranged on the other side, such as the left side, of the battery pack side by side. The high-low voltage connecting lines are intensively distributed on the left side of the integral energy storage battery cluster, the liquid cooling pipeline is arranged on the right side, the compact layout of the battery pack and the high-voltage box is not affected by the liquid cooling pipeline, the connection layout of connecting wires is not affected, the occupied area of the liquid cooling energy storage battery cluster can be saved, and better heat exchange can be realized. Therefore, compared with the prior art, the liquid cooling energy storage battery cluster occupies 30 percent of the volume, improves the compact layout effect and realizes higher energy density.
In some embodiments, the liquid cooling pipeline comprises a water inlet pipe exhaust valve and a water inlet pipe stop valve, wherein the water inlet pipe exhaust valve is arranged in the upstream direction of the water inlet main pipeline, and the water inlet pipe stop valve is arranged in the downstream direction of the water inlet main pipeline away from the water inlet pipe exhaust valve.
Referring to fig. 3, the liquid cooling pipeline includes a water inlet pipe exhaust valve 052 and a water inlet pipe stop valve 054, the water inlet pipe exhaust valve 052 is disposed in an upstream direction of the water inlet main pipeline 051, and the water inlet pipe stop valve 054 is disposed in a downstream direction of the water inlet main pipeline 051, which is far from the water inlet pipe exhaust valve 052. As shown in fig. 3, the inlet pipe exhaust valve 054 is disposed in a direction close to the uppermost end of the inlet pipe 051, and the inlet pipe stop valve 054 is disposed in a direction away from the inlet pipe exhaust valve 052 close to the lowermost end of the vertical inlet pipe.
In some embodiments, the liquid-cooled circuit comprises: the three-way connecting pipe and the branch joint are used for arranging the water inlet pipe exhaust valve on the water inlet main pipeline; and the water inlet branch pipeline is connected with the corresponding water inlet main pipeline through the branch joint.
As shown in fig. 3, the liquid cooling pipeline is provided with a three-way connecting pipe 056 and a branch joint 055. The branch joint 055 connects the water inlet branch pipe 053 with the corresponding water inlet main pipe 051. The three-way connecting pipe 055 sets the inlet pipe exhaust valve 052 on the branch of the inlet main pipeline 051. Above-mentioned overall structure is in liquid cooling energy storage battery heat transfer in-process, and on the one hand at the leading-in initial stage of water, there is gas in the pipeline, can get rid of gas from inlet tube way discharge valve 052 through circulating pressure this moment, improves the heat conduction efficiency of coolant. On the other hand, when heat transfer meets unusual problem, open inlet tube stop valve 054, evacuation coolant liquid to the convenience is maintained, can prevent effectively that the coolant liquid from leaking.
In some embodiments, the high voltage tank is provided with a first disconnect switch, a status indicator light, and a first low voltage interface.
As shown in fig. 2, the high-voltage tank is provided with a first cut-off switch such as a high-voltage tank manual switch 034 for turning off the high-voltage tank by the high-voltage tank manual switch 034 when an abnormality is encountered, or the like. The high pressure tank is provided with a status indicator 033 which can be used to indicate the operating status of the high pressure tank, and once an abnormal situation is encountered, the status indicator 033 gives a warning so as to deal with the abnormal situation as soon as possible. The first low voltage interface on the high voltage box, such as 035, can be connected with the emergency outlet interface to supply power to the low voltage bus, etc. In some embodiments, the high pressure tank is provided with a high pressure tank P+036 and a high pressure tank P-037.
In some embodiments, the battery pack is further provided with a fire interface, a second low voltage interface, an explosion protection valve, and a second disconnect switch.
As shown in fig. 2, the battery pack is provided with a second low voltage interface such as battery pack low voltage interface 026 for power. The battery pack is also provided with a fire interface such as a battery pack fire interface 025 for connection with a fire device which can spray fire extinguishing agent into the battery pack through the fire interface. The battery pack is also provided with an explosion-proof valve and a second disconnection switch. An explosion-proof valve, such as a battery pack explosion-proof valve 024, is used to improve the safety performance of the battery pack. A second circuit breaker, such as a battery pack circuit breaker 023, is used to shut off power and the like when an abnormality is encountered.
In some embodiments, the cooling medium includes water and ethylene glycol.
In some embodiments, the liquid cooling pipeline is provided with water and glycol in a preset proportion, the cooling medium is used as a heat exchange medium, the specific heat capacity of the cooling liquid is large, the heat conduction effect is obvious, and compared with air cooling heat exchange, the efficiency is greatly improved.
As shown in fig. 1-3, the battery rack is provided with 8 battery packs 02, 1 high-pressure box 03 and a liquid cooling pipeline (comprising a liquid cooling water outlet pipeline 04 and a liquid cooling water inlet pipeline 05); the 8 battery packs are connected in series through high-voltage and low-voltage bundles to form a high-voltage direct current part. After the battery pack is connected in series through the high-low voltage wire bundles, the anode and the cathode of the battery pack are respectively connected with the anode and the cathode of the battery of the high-voltage box (the anode 031 of the battery of the high-voltage box/the cathode 032 of the battery of the high-voltage box), direct current output (such as the high-voltage box P+036/the high-voltage box P-037) is carried out through a protection device inside the high-voltage box, and the high-voltage box is further provided with a manual switch 034 of the high-voltage box and a state indicator 033 of the high-voltage box. Meanwhile, a water inlet main pipeline and a water outlet main pipeline in the liquid cooling pipeline are vertically erected on one side of the high-pressure box and one side of the battery and are positioned in the battery rack, heat exchange is carried out through cooling mediums (water and ethylene glycol) in the liquid cooling pipeline, and heat exchange efficiency is greatly improved. The lower extreme of battery rack 01 is provided with the supporting legs, and the upper end is provided with rings. The supporting legs and the battery rack provide stable support for the high-voltage box and the battery pack, and the hanging rings on the battery rack facilitate the movement of the integral liquid cooling energy storage battery cluster. In some implementations the support feet may be universal wheels.
According to the liquid cooling energy storage battery cluster integral heat exchange structure, the heat exchange temperature difference is controlled within 5 ℃, and the battery cycle life is about 6000-8000 times, so that the heat exchange effect is greatly improved, and the service life of the battery cluster is prolonged. The liquid cooling energy storage battery cluster does not influence the compact layout of the battery pack and the high-voltage box, the connection layout of connecting wires and the like, the occupied space of the liquid cooling energy storage battery cluster can be saved, better heat exchange can be realized, and the safety performance is also improved. Therefore, compared with the prior art, the liquid cooling energy storage battery cluster occupies 30 percent of the volume, and compared with air cooling, the heat exchange energy consumption is reduced by 1 to 2 percent, so that the liquid cooling energy storage battery cluster has better economic benefit.
The same and similar parts of the embodiments in this specification are all referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the product embodiments described later, since they correspond to the methods, the description is relatively simple, and reference is made to the description of parts of the system embodiments.
The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions easily conceivable by those skilled in the art within the technical scope of the present application should be covered in the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.