Battery energy storage system and method thereof

Abstract

The invention belongs to the technical field of energy storage equipment, and particularly relates to a battery energy storage system and method, and the equipment comprises a controller, a cabinet body, an energy storage battery module arranged in the cabinet body, a power-off module for controlling the connection and disconnection between the energy storage battery module and a load or a charging power supply, and a cooling system for cooling the energy storage battery module. The heat dissipation system comprises a liquid cooling mechanism for performing liquid cooling on the energy storage battery module, a supply mechanism for supplying a cooling medium to the liquid cooling mechanism, and a heat exchange backflow mechanism for cooling the cooling medium flowing through the energy storage battery module and enabling the cooling medium to flow back to the supply mechanism; the energy storage battery module comprises a battery cell shell and a plurality of battery chips which are horizontally arranged in the battery cell shell side by side; a heat dissipation gap is formed between every two adjacent electric chips, and the heat exchange end of the liquid cooling mechanism extends into the heat dissipation gaps and is attached to the electric chips on the two sides of the liquid cooling mechanism; the internal core temperature of the energy storage battery module can be controlled, the cooling effect is good, and stable operation of energy storage equipment is effectively guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage devices, and particularly to a battery energy storage system and a method thereof. Background Art

[0002] In the field of energy storage technology, the application of energy storage battery packs is becoming increasingly important, especially in electric vehicles, grid energy storage, and renewable energy systems. However, the performance and safety of energy storage batteries largely depend on the effectiveness and rationality of their thermal management systems. With the progress of battery technology, the energy density of batteries has been continuously increasing, which has led to a significant increase in the heat generated during the charging and discharging processes. Therefore, heat dissipation has become a crucial technical challenge.

[0003] Currently, the traditional heat dissipation methods are all single air cooling. Although they can meet the heat dissipation requirements to a certain extent, when faced with high-performance battery packs, these methods often appear inefficient and have poor effects, resulting in a high risk of spontaneous combustion of the battery pack and making it difficult to ensure the continuous and stable operation of the battery within the optimal temperature range. Summary of the Invention

[0004] The purpose of the present invention is to provide a battery energy storage system and a method thereof to solve the problems raised in the background art.

[0005] To achieve the above purpose, the present invention provides the following technical solutions: A battery energy storage system and a method thereof. The device includes a controller, a cabinet, an energy storage battery module disposed in the cabinet, a power-off module for controlling the connection and disconnection of the energy storage battery module with a load or a charging power source, and a heat dissipation system for dissipating heat from the energy storage battery module; the heat dissipation system includes a liquid cooling mechanism for cooling the energy storage battery module by liquid cooling, a supply mechanism for supplying a cooling medium to the liquid cooling mechanism, and a heat exchange and reflux mechanism for cooling the cooling medium flowing through the energy storage battery module and returning it to the supply mechanism; the energy storage battery module includes a cell housing, and a plurality of electric chips horizontally arranged side by side in the cell housing; a heat dissipation gap is provided between adjacent two of the electric chips, and the heat exchange end of the liquid cooling mechanism extends into the heat dissipation gap and fits with the electric chips on both sides thereof.

[0006] In the battery energy storage system and the method thereof of the present invention, the liquid cooling mechanism is further used to trigger the power-off module to cut off the connection between the load or the charging power source and the energy storage battery module.

[0007] The battery energy storage system and method thereof according to the present invention, wherein the liquid cooling mechanism includes a heat exchange plate having an accommodation cavity for the cooling medium to flow through, and a driving unit for driving the heat exchange plate to move up and down; the lower end of the heat exchange plate forms the heat exchange end and extends into the heat dissipation gap and is attached to the electric chips on both sides thereof; an avoidance hole adapted to the upper end of the heat exchange plate is provided at the top of the battery cell housing; a liquid inlet pipe and a liquid outlet pipe extending vertically into the accommodation cavity are provided on the bottom surface of the battery cell housing, and both the liquid inlet pipe and the liquid outlet pipe are in close sliding fit with the heat exchange plate.

[0008] The battery energy storage system and method thereof according to the present invention, wherein the cooling medium is perfluoromethylcyclohexanone liquid, a partition for sealing the internal flow channel is provided inside the upper end of the liquid inlet pipe, a cooling medium flow port is axially penetrated through the side wall of the upper end of the liquid inlet pipe, the cavities on the upper and lower sides of the partition are communicated through the cooling medium flow port, the axial length of the cooling medium flow port is greater than the longitudinal stroke of the heat exchange plate, and when assembled in place, the lower end of the cooling medium flow port is flush with the bottom surface of the accommodation cavity.

[0009] The battery energy storage system and method thereof according to the present invention, wherein two capacitor plates parallel to each other are respectively provided on the two inner side walls of the accommodation cavity in the thickness direction thereof; connection pins connected to the capacitor plates are provided on the upper end surface of the heat exchange plate; a plurality of the capacitor units are provided and are uniformly arranged along the length direction of the heat exchange plate; when assembled in place, the height of the liquid level of the cooling medium is higher than or flush with the horizontal midline of the capacitor plates, so as to realize that when the heat exchange plate is expanded and extruded by the electric chips on both sides thereof, the distance between the two capacitor plates is reduced and the controller is triggered to control the driving unit to drive the heat exchange plate to rise, and the battery cell housing, the accommodation cavity and the internal flow channel are all communicated through the cooling medium flow port.

[0010] The battery energy storage system and method thereof according to the present invention, wherein an exhaust channel communicated with the outside is provided on the top surface of the accommodation cavity, an exhaust solenoid valve corresponding to the exhaust channel is provided on the heat exchange plate, and both the exhaust solenoid valve and the liquid outlet pipe are communicated with the heat exchange reflux mechanism.

[0011] The battery energy storage system and method thereof according to the present invention, wherein an extension arm is provided at the upper end of the heat exchange plate, the extension arm is longitudinally slidably connected to the outer side wall of the battery cell housing, and the driving unit is provided outside the battery cell housing and is used for driving the extension arm to move up and down.

[0012] The battery energy storage system and method thereof according to the present invention, wherein the supply mechanism includes a liquid storage tank for storing a cooling medium, and a supply pump for pumping the cooling medium in the liquid storage tank into the liquid outlet pipe; the supply pump is electrically connected to the controller; the heat exchange and reflux mechanism includes a cooling tank for storing a low-temperature coolant, and a heat exchange pipe provided in the cooling tank; one end of the heat exchange pipe is communicated with the liquid outlet pipe and the outflow end of the exhaust solenoid valve, and the other end is communicated with the liquid storage tank.

[0013] The battery energy storage system and method thereof according to the present invention, wherein a reflux pump is provided between the heat exchange pipe and the liquid outlet pipe and the solenoid valve.

[0014] In addition, the present invention also provides a temperature control method for a battery energy storage device, and the method includes the following steps: Step 1: Pump the low-temperature cooling medium in the liquid storage tank into the accommodating cavity through the supply pump, so as to absorb the heat dissipated by the electric chips on both sides, and reduce the internal temperature of the energy storage battery module. Step 2: Pump the high-temperature cooling medium in the accommodating cavity into the heat exchange pipe through the reflux pump, so as to transfer the heat to the low-temperature coolant in the cooling tank, and realize the reflux of the cooling medium to the liquid storage tank in a low-temperature state. Step 3: Detect the bulge of the electric chip by changing the distance between the two capacitor electrodes, and trigger the controller to control the driving unit to drive the heat exchange plate to rise, so that the inner cavity of the battery cell housing, the accommodating cavity and the internal flow path of the liquid inlet pipe are all communicated through the cooling medium flow port, and the cooling medium flows into the heat dissipation gap. Step 4: Circulate the cooling medium in the heat dissipation gap through the solenoid valve.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: During use, the low-temperature cooling medium is input into the heat exchange end through the supply mechanism to absorb the heat dissipated by the electric chips on both sides, thereby reducing the internal core temperature of the energy storage battery module. The cooling and heat dissipation are more thorough, the efficiency is higher, and the effect is better; the cooling medium that has passed through the heat exchange end can be cooled again through the heat exchange and reflux mechanism and then return to the supply mechanism in a low-temperature state for the next cycle. Description of the Drawings

[0016] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 This is the overall structural appearance diagram of the present invention.

[0018] Figure 2 For Figure 1 the longitudinal sectional view.

[0019] Figure 3 This is the longitudinal sectional view of the energy storage battery module of the present invention along its length direction.

[0020] Figure 4 For Figure 3 the enlarged view of the local structure at A in

[0021] Figure 5 This is the side view of the heat exchange plate of the present invention.

[0022] Figure 6 This is the longitudinal sectional view of the energy storage battery module of the present invention along its width direction. Specific Embodiments

[0023] The terms "first", "second", "third", "fourth", etc. in the description and claims of the present invention and the drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products, or devices.

[0024] Referring to "embodiments" herein means that the specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present invention. The phrase appears in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0025] "Plurality" means two or more. "And / or" describes the relationship between associated objects and indicates that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0026] Moreover, terms indicating directions such as "up, down, left, right, upper end, lower end, longitudinal" are all referenced based on the attitude position of the device or equipment described in this solution during normal use.

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely below. Obviously, the described embodiments are partial embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] This embodiment discloses a battery energy storage system and its method as shown in Figures 1 to 6 The device includes a controller (not shown in the figure), a cabinet 10, an energy storage battery module 20 disposed in the cabinet 10, a power-off module 30 for controlling the connection and disconnection between the energy storage battery module 20 and a load or a charging power source, and a heat dissipation system 40 for dissipating heat from the energy storage battery module 20. Among them, a plurality of energy storage battery modules 20 are provided and are longitudinally arranged layer by layer in the center of the cabinet 10. Further, the heat dissipation system 40 includes a liquid cooling mechanism 41 for liquid-cooling and cooling the energy storage battery module 20, a supply mechanism 42 for supplying a cooling medium to the liquid cooling mechanism 41, and a heat exchange and reflux mechanism 43 for cooling the high-temperature cooling medium flowing through the energy storage battery module 20 and returning it to the supply mechanism 42; among them, the energy storage battery module 20 includes a battery cell housing 21, and a plurality of battery chips 22 horizontally arranged side by side in the battery cell housing 21. The battery chips 22 are rectangular and are vertically arranged. A heat dissipation gap 50 is provided between two adjacent battery chips 22. The heat exchange end of the liquid cooling mechanism 41 extends into the heat dissipation gap 50 and fits with the battery chips 22 on both sides thereof, so as to realize the heat transfer of the battery chips 22 to the cooling medium and be carried away when the cooling medium flows through the heat exchange end; During use, the low-temperature cooling medium is input into the heat exchange end through the supply mechanism 42 to absorb the heat dissipated by the battery chips 22 on both sides, thereby realizing the reduction of the internal core temperature of the energy storage battery module 20, with more thorough cooling and heat dissipation, higher efficiency and better effect; and the cooling medium that has passed through the heat exchange end can be cooled by the heat exchange and reflux mechanism 43 and then return to the supply mechanism 42 in a low-temperature state for the next cycle.

[0029] In this embodiment, the liquid cooling mechanism 41 is further configured to trigger the power-off module 30 to cut off the connection between the load or charging power supply and the energy storage battery module 20. The power-off module 30 can be a conventional circuit breaker, and it can execute the power-off command issued by the system after being connected to the controller. Specifically, the liquid cooling mechanism 41 includes a heat exchange plate 411 having a receiving cavity 410 for the cooling medium to flow through, and a driving unit 412 for driving the heat exchange plate 411 to move up and down. Generally, the material of the heat exchange plate 411 is copper or aluminum alloy, its thickness is between 5-10 mm, and the thickness of the receiving cavity 410 is between 2-6 mm. Preferably, the thickness of the heat exchange plate 411 is 5 mm, and the thickness of the receiving cavity 410 is 3 mm, so as to ensure that the heat of the electric chip 22 is transferred to the cooling medium in the receiving cavity 410 fast enough to ensure timely heat exchange, avoid the accumulation of heat of the electric chip 22, and at the same time, there is a certain buffer deformation space between two adjacent electric chips 22, so that when the electric chip 22 bulges, it can squeeze the outer wall of the receiving cavity 410 inward. Specifically, the length of the heat exchange plate 411 is greater than the length of the electric chip 22 to ensure that the side surface of the electric chip 22 can be fully attached to the heat exchange plate 411 to ensure the speed and effect of heat transfer.

[0030] Furthermore, the lower end of the heat exchange plate 411 forms the above-mentioned heat exchange end and extends into the heat dissipation gap 50 and is attached to the electric chips 22 on both sides of the heat dissipation gap 50 to ensure the contact area and the heat transfer efficiency. An avoidance hole 211 adapted to the upper end of the heat exchange plate 411 is provided at the top of the battery cell housing 21. After assembly, the inner wall of the avoidance hole 211 is slidably and tightly attached to the side wall of the heat exchange plate 411. The receiving cavity 410 is rectangular and its height is less than the height of the inner cavity of the battery cell housing 21, so that the side wall of the heat exchange plate 411 can be tightly attached to the inner wall of the avoidance hole 211 during the upward movement of the heat exchange plate 411, preventing the upper end of the heat exchange plate 411 from being indented and deformed inward due to the extrusion of the inner wall of the avoidance hole 211. In order to ensure the sealing performance of the battery cell housing 21 during the longitudinal movement of the heat exchange plate 411, a sealing gasket can be provided on the side wall of the upper end of the heat exchange plate 411.

[0031] Furthermore, a liquid inlet pipe 60 and a liquid outlet pipe 70 vertically extending into the receiving cavity 410 are provided on the bottom surface of the battery cell housing 21. The lower ends of the liquid inlet pipe 60 and the liquid outlet pipe 70 both penetrate the bottom of the battery cell housing 21 and are connected to the supply mechanism 42. The liquid inlet pipe 60 and the liquid outlet pipe 70 are respectively located at both ends of the receiving cavity 410, so that the cooling medium can stay in the receiving cavity 410 for a certain time and fully absorb the heat of the electric chip 22. The liquid inlet pipe 60 and the liquid outlet pipe 70 are both slidably and tightly attached to the heat exchange plate 411. Generally, a sealing rubber sleeve tightly attached to the outer side walls of the liquid inlet pipe 60 and the liquid outlet pipe 70 is provided at the bottom of the heat exchange plate 411 to prevent the leakage of the cooling medium.

[0032] In this embodiment, the cooling medium is perfluorohexanone liquid. Inside the upper end of the liquid inlet pipe 60, there is a partition plate 61 that seals the internal flow channel 600 thereof. Axially penetrating through the side wall of the upper end of the liquid inlet pipe 60 is a cooling medium flow port 62. The two cavities of the internal flow channels on the upper and lower sides of the partition plate 61 are connected through the cooling medium flow port 62. The axial length of the cooling medium flow port 62 is greater than the longitudinal stroke of the heat exchange plate 411, that is, the upper and lower ends of the cooling medium flow port 62 are respectively located on the upper and lower sides of the partition plate 61, avoiding the cooling medium from impacting the top wall of the accommodation cavity 410 upwards, and at the same time enabling the cooling medium to be laterally ejected onto the side wall of the accommodation cavity 410 for cooling in a short time. When assembled in place, the lower end of the cooling medium flow port 62 is flush with the bottom surface of the accommodation cavity 410 to prevent the cooling medium in the accommodation cavity 410 from leaking into the inner cavity of the battery cell housing 21 from the lower end of the cooling medium flow port 62 in the initial state. Further, the structure and installation method of the liquid outlet pipe 70 are the same as those of the liquid inlet pipe 60. It also has a partition plate 71 inside and a cooling medium flow port 72 on the side wall, so as to play a role in timely discharging the liquid in the battery cell housing 21 and the accommodation cavity 410, and avoiding the continuous increase in pressure inside the battery cell housing 21 and the occurrence of explosion danger.

[0033] In this embodiment, on the two inner side walls of the accommodation cavity 410 along its thickness direction, there are respectively two capacitor plates 80 that are parallel and opposite to each other. On the upper end face of the heat exchange plate 411, there are connection pins 90 connected to the capacitor plates 80, so as to facilitate connecting the capacitor plates to the controller. Further, the two capacitor plates 80 form a capacitor unit, and there are multiple such capacitor units arranged uniformly along the length direction of the heat exchange plate 411 to correspond to the length of the electronic chip 22.

[0034] When assembled in place, the height of the liquid level 500 of the cooling medium is higher than or flush with the horizontal midline of the capacitor plates 80, so that when the part of the heat exchange plate 411 corresponding to the accommodation cavity 410 is squeezed by the expansion and bulging of the electronic chips 22 on both sides thereof, the distance between the two capacitor plates 80 decreases, and thus the output capacitance of the capacitor unit changes. The controller can timely obtain the situation of bulging inside the electronic chip 22 through this changed capacitance, and then facilitate timely notifying the background management system to take corresponding response measures, so that the management personnel can timely check the equipment or cut off the power for isolation, and timely prevent the battery from catching fire due to the continuous deterioration of the bulge and the rupture of the electronic chip 22.

[0035] In addition, when the two side walls of the accommodation cavity 410 are squeezed, the liquid level of the cooling medium will rise simultaneously. The rise of the liquid level will cause a change in the dielectric constant of the capacitor unit, and further cause a change in the output capacitance of the capacitor unit. This change and the change caused by the change in the distance mentioned above jointly provide a triggering effect for the controller, which can effectively ensure the accuracy and stability of the battery bulging. The output capacitances of the two changes are also used to trigger the controller to control the driving unit 412 to drive the heat exchange plate 411 to rise, and to connect the battery cell housing 21, the accommodation cavity 410 and the internal flow channels through the cooling medium flow port 62. As a result, the cooling medium in the liquid outlet pipe 70 and the accommodation cavity 410 flows into the inner cavity of the battery cell housing 21 and quickly fills the inner cavity 210 of the battery cell housing 21 and the heat dissipation gap 50, so as to realize that the cooling medium quickly enters the rupture position of the electric chip 22 and timely blocks the combustion reaction of the battery at the initial stage when the electric chip 22 bursts due to bulging, preventing the further combustion of the electric chip 22 from causing the spread of fire, and automatic fire extinguishing can be achieved.

[0036] Furthermore, in order to ensure the amount of the cooling medium between the heat exchange plate and the electric chip, strip-shaped grooves 41a are provided on the two side walls of the heat exchange plate 411 for the flow and storage of the cooling medium. Correspondingly, the inlet pipe and the outlet pipe are respectively arranged at the two ends of the strip-shaped groove and communicated with it. Among them, the triggering condition of the driving unit 412 can be set by the magnitude of the value of the output capacitance. For example, when the output capacitances of 5 capacitor units all change, at this time the background system judges that the expansion degree of the electric chip 22 has developed to the standard that is sufficient to break the electric chip 22. Then the background disconnects the connection of the charging power supply or the load through the controller power-off module 30, and controls the driving unit 412 to drive the heat exchange plate 411 to rise, so as to connect the inner cavity of the accommodation cavity 410 and the battery cell housing 21 through the cooling medium flow port 62, so that the cooling medium quickly fills the heat dissipation gap 50 and covers the side wall of the electric chip 22. As a result, when the electric chip 22 has a crack, the cooling medium timely enters the inside of the electric chip 22 to block the internal electrochemical reaction, so that the thermal runaway in the electric chip is inhibited, and the combustion of the electric chip is effectively prevented. Among them, other fire extinguishing aids can be added to the cooling medium to further enhance the fire extinguishing effect of the battery. In addition, a three / six / seven fluoropropane fire extinguishing agent or a water-based fire extinguishing agent can also be used to achieve this.

[0037] In this embodiment, an exhaust channel 100 communicating with the outside is provided on the top surface of the accommodation cavity 410. An exhaust solenoid valve 110 is provided on the heat exchange plate 411 corresponding to the exhaust channel. Both the exhaust solenoid valve 110 and the liquid outlet pipe 70 are communicated with the heat exchange and reflux mechanism 43, which is used to timely discharge the floating liquid droplets above the liquid level after the cooling medium absorbs heat and vaporizes, so as to take away the heat in the accommodation cavity 410, and at the same time can also play a role in keeping the pressure in the accommodation cavity 410 constant.

[0038] In this embodiment, an extension arm 120 is provided at the upper end of the heat exchange plate 411. The extension arm 120 is longitudinally slidably connected to the outer side wall of the battery cell housing 21. The driving unit 412 is provided outside the battery cell housing 21 and is used to drive the extension arm 120 to move up and down. Further, a bottom plate 130 is provided at the bottom of the battery cell housing 21. The battery cell housing 21 and the driving unit 412 are both provided on the upper surface of the bottom plate 130. A protective cover 131 is provided above the bottom plate to provide protection for the battery cell housing; the liquid inlet pipe 60 and the liquid outlet pipe 70 are also provided on the bottom plate 130 and penetrate into the battery cell housing 21 and the accommodating cavity 410, so as to facilitate connecting the supply mechanism 42 and the heat exchange and reflux mechanism 43 to circulate the cooling medium, and at the same time, it is also convenient for fixed installation.

[0039] In this embodiment, the supply mechanism 42 includes a liquid storage tank 421 for storing the cooling medium, and a supply pump 422 for pumping the cooling medium in the liquid storage tank 421 into the liquid outlet pipe 70; the supply pump 422 is electrically connected to the controller; the heat exchange and reflux mechanism 43 includes a cooling tank 431 for storing low-temperature coolant, and a heat exchange pipe 432 provided in the cooling tank 431; one end of the heat exchange pipe 432 is communicated with the liquid outlet pipe 70 and the outflow end of the exhaust solenoid valve 110, and the other end is communicated with the liquid storage tank 421. The cooling tank 431 is filled with coolant for heat exchange of the heat exchange pipe 432. Ordinary water can generally be used as the coolant. Of course, the functions of the cooling tank 431 and the coolant can also be realized by a cooling fan, and it can also quickly cool the heat exchange pipe 432.

[0040] In this embodiment, a reflux pump 140 is provided between the heat exchange pipe 432 and the liquid outlet pipe 70 and the solenoid valve. The reflux pump 140 is connected to the controller to facilitate control and prevent the cooling medium from flowing back.

[0041] In addition, this embodiment also provides a temperature control method for a battery energy storage device, and this method includes the following steps: Step 1: Pump the low-temperature cooling medium in the liquid storage tank 421 into the accommodating cavity 410 through the supply pump 422 to absorb the heat dissipated by the electric chips 22 on both sides of the accommodating cavity 410, so as to reduce the internal temperature of the energy storage battery module 20; Step 2: Pump the high-temperature cooling medium in the accommodating cavity 410 into the heat exchange pipe 432 through the reflux pump 140 to transfer the heat to the low-temperature coolant in the cooling tank 431, so as to realize the reflux of the cooling medium to the liquid storage tank 421 in a low-temperature state; Step 3: Detect the bulge of the electric chip 22 by changing the distance between the two capacitor plates, and trigger the controller to control the driving unit 412 to drive the heat exchange plate 411 to rise, so that the inner cavity of the battery cell housing 21, the accommodating cavity 410 and the internal flow channel of the liquid inlet pipe 60 are all communicated through the cooling medium flow port 62, and the cooling medium flows into the heat dissipation gap 50; Step 4: Circulate the cooling medium in the heat dissipation gap 50 through the solenoid valve.

[0042] It should be understood that those of ordinary skill in the art can make improvements or transformations according to the above description, and all such improvements and transformations should fall within the protection scope of the appended claims of the present invention.

Claims

1. A battery energy storage device, characterized in that: The device comprises a controller, a cabinet, an energy storage battery module arranged in the cabinet, a power-off module for controlling the connection and disconnection between the energy storage battery module and a load or a charging power source, and a heat dissipation system for dissipating heat for the energy storage battery module; the heat dissipation system comprises a liquid cooling mechanism for liquid cooling the energy storage battery module, a supply mechanism for supplying a cooling medium to the liquid cooling mechanism, and a heat exchange reflux mechanism for cooling the cooling medium flowing through the energy storage battery module and returning it to the supply mechanism; the energy storage battery module comprises a battery cell shell, and a plurality of electric chips horizontally arranged side by side in the battery cell shell; a heat dissipation gap is provided between two adjacent electric chips, and a heat exchange end of the liquid cooling mechanism extends into the heat dissipation gap and fits the electric chips on both sides thereof.

2. The battery energy storage device according to claim 1, characterized in that: The liquid cooling mechanism is also used to trigger the power-off module to cut off the connection between the load or charging power source and the energy storage battery module.

3. The battery energy storage device according to claim 2, characterized in that: The liquid cooling mechanism includes a heat exchange plate having a accommodating cavity for circulating a cooling medium, and a driving unit for driving the heat exchange plate to rise and fall; the lower end of the heat exchange plate forms the heat exchange end and extends into the heat dissipation gap and fits the electric chips on both sides thereof; the top of the battery cell housing is provided with an avoidance hole adapted to the upper end of the heat exchange plate; a liquid inlet pipe and a liquid outlet pipe extending into the accommodating cavity are vertically provided on the bottom surface of the battery cell housing, and the liquid inlet pipe and the liquid outlet pipe both slide and fit tightly with the heat exchange plate.

4. The battery energy storage device according to claim 3, characterized in that: The cooling medium is perfluorohexanone liquid, and a partition is provided at the upper end of the liquid inlet pipe to seal its internal flow channel. A cooling medium flow channel opening is axially penetrated on the side wall of the upper end of the liquid inlet pipe. The cavities on the upper and lower sides of the partition are connected through the cooling medium flow channel opening. The axial length of the cooling medium flow channel opening is greater than the longitudinal stroke of the heat exchange plate. When assembled in place, the lower end of the cooling medium flow channel opening is flush with the bottom surface of the accommodating cavity.

5. The battery energy storage device according to claim 4, characterized in that: Two parallel and opposite capacitor electrodes are respectively provided on the two inner side walls of the accommodating cavity along the thickness direction; connecting pins connected to the capacitor electrodes are provided on the upper end surface of the heat exchange plate; the two capacitor electrodes constitute a capacitor unit, and the capacitor units are provided in plurality and are evenly arranged along the length direction of the heat exchange plate; when assembled in place, the height of the liquid level of the cooling medium is higher than or flush with the horizontal center line of the capacitor electrodes, so that when the heat exchange plate is expanded and squeezed by the electric chips on both sides thereof, the distance between the two capacitor electrodes is reduced and the controller is triggered to control the driving unit to drive the heat exchange plate to rise, and the battery cell housing, the accommodating cavity and the internal flow channel are all connected through the cooling medium flow channel opening.

6. The battery energy storage device according to claim 5, characterized in that: An exhaust channel connected to the outside is provided on the top surface of the accommodating chamber, an exhaust solenoid valve is provided on the heat exchange plate corresponding to the scheduling channel, and the exhaust solenoid valve and the liquid outlet pipe are both connected to the heat exchange reflux mechanism.

7. The battery energy storage device according to claim 6, characterized in that: An extension arm is provided at the upper end of the heat exchange plate, and the extension arm is longitudinally slidably connected to the outer side wall of the battery cell housing. The driving unit is arranged on the outer side of the battery cell housing and is used to drive the extension arm to move up and down.

8. The battery energy storage device according to claim 7, characterized in that: The supply mechanism includes a liquid storage tank for storing cooling medium, and a supply pump for pumping the cooling medium in the liquid storage tank into the liquid outlet pipe; the supply pump is electrically connected to the controller; the heat exchange reflux mechanism includes a cooling tank for storing low-temperature cooling liquid, and a heat exchange tube arranged in the cooling tank; one end of the heat exchange tube is connected to the liquid outlet pipe and the outflow end of the exhaust solenoid valve, and the other end is connected to the liquid storage tank.

9. The battery energy storage device according to claim 8, characterized in that: A reflux pump is provided between the heat exchange tube, the liquid outlet pipe and the solenoid valve.

10. A temperature control method for a battery energy storage device, the battery energy storage device according to claim 9, characterized in that: The method comprises the following steps: Step 1: Pumping the low-temperature cooling medium in the liquid storage tank into the accommodating cavity through the supply pump to absorb the heat dissipated by the electric chips on both sides of the accommodating cavity, thereby reducing the internal temperature of the energy storage battery module; Step 2: Pumping the high-temperature cooling medium in the accommodating chamber into the heat exchange tube through the reflux pump to transfer heat to the low-temperature cooling liquid in the cooling tank, so that the cooling medium refluxes to the liquid storage tank in a low-temperature state; Step 3: Detecting the bulge of the electric chip by changing the spacing between the two capacitor electrodes, and triggering the controller to control the driving unit to drive the heat exchange plate to rise, so that the inner cavity of the battery cell housing and the accommodating cavity and the internal flow channel of the liquid inlet pipe are connected through the cooling medium flow channel opening, so that the cooling medium flows into the heat dissipation gap; Step 4: circulate the cooling medium in the heat dissipation gap through the solenoid valve.

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