Liquid cooling energy storage device

Abstract

The utility model provides a liquid cooling energy storage device, the liquid cooling energy storage device comprises a cabinet body, a cabinet door, a liquid cooling pipeline and a liquid cooling unit, the cabinet body accommodates a plurality of battery packs, the cabinet door is hinged to the cabinet body, the liquid cooling unit is installed on the end face, facing the cabinet body, of the cabinet door, and the liquid cooling pipeline comprises a liquid supply side pipe and a liquid return main pipe; the liquid supply side pipe and the liquid return main pipe are communicated with the liquid cooling unit; the liquid supply side pipe is communicated with the battery packs through the liquid supply branch pipes, the ends, away from the liquid supply side pipe, of the liquid supply branch pipes are connected to the end faces, facing the cabinet door, of the corresponding battery packs, and the liquid return main pipe is communicated with the battery packs through the liquid return branch pipes. And one end, far away from the liquid return main pipe, of each liquid return branch pipe is connected to the end surface, facing the cabinet door, of the corresponding battery pack. The liquid supply branch pipe and the liquid return branch pipe face the depth direction of the cabinet body, the occupied space of the energy storage device is saved, and the energy density of the energy storage device is improved.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a liquid-cooled energy storage device. Background Art

[0002] With the rapid development of the energy storage industry, energy storage devices are also being widely used. During the charging and discharging process, energy storage devices will generate a large amount of heat, causing the temperature of the energy storage device and the power converter connected to the energy storage device to continue to rise. When the ambient temperature of the energy storage device rises to a certain temperature, the reaction speed of the battery in the energy storage device will accelerate, which will cause the battery life to be shortened.

[0003] By circulating coolant in the liquid cooling pipeline, the internal temperature of the energy storage device can be effectively reduced. However, the existing liquid cooling pipeline is installed in the cabinet of the energy storage device. Due to the layout of the liquid cooling pipeline, the space utilization rate of the energy storage device is low, which has a negative impact on the energy density of the energy storage device. Utility Model Content

[0004] The technical problem to be solved by the present application is to provide a liquid-cooled energy storage device that improves the space utilization rate of the energy storage device.

[0005] In a first aspect, the present application provides a liquid-cooled energy storage device, which includes a cabinet, multiple battery packs, a first side tube and multiple branch tubes; the cabinet includes a cabinet and a cabinet door, and the cabinet door is hinged to the cabinet; multiple battery packs are stacked and accommodated in the cabinet; the multiple battery packs have multiple liquid cooling ports, and the multiple liquid cooling ports are arranged at intervals in the stacking direction of the multiple battery packs, and the multiple liquid cooling ports are used to circulate cooling liquid; the first side tube extends along the stacking direction of the multiple battery packs, and the first side tube is used to circulate the cooling liquid. The first side tube is arranged in the cabinet, and in the depth direction of the cabinet, the first side tube is located on the side of the battery pack facing the cabinet door, and multiple connecting joints are arranged at intervals in the extension direction of the first side tube, and each of the connecting joints has an interface facing the multiple battery packs in the depth direction of the cabinet; the multiple branch tubes are used to connect the interfaces of the multiple connecting joints and the liquid cooling ports of the multiple battery packs. In the present solution, since the interface of the connecting joint connecting the branch pipe and the first side pipe is oriented toward the battery pack along the depth direction of the cabinet, it can be obtained that one end of the branch pipe is connected to the interface of the connecting joint along the depth direction of the cabinet, and since the first side pipe is located on the side of the battery pack facing the cabinet door in the depth direction of the cabinet, the connection between the branch pipe and the connecting joint in the depth direction of the cabinet can reduce the space occupied by the branch pipe in the width direction of the cabinet, effectively utilize the space between the first side pipe and the battery pack in the depth direction of the cabinet, and improve the energy density of the liquid-cooled energy storage device.

[0006] In combination with the first aspect, in a possible implementation, the liquid-cooled energy storage device also includes a liquid cooling unit, a cross-door hose, a second side tube and a rotary joint. The liquid cooling unit is fixed to the end surface of the cabinet door facing the battery pack. One end of the cross-door hose is connected to the first side tube through a rotary joint. The rotary joint is used to rotate along the circumference of the first side tube during the process of opening or closing the cabinet door. The other end of the cross-door hose is connected to one end of the second side tube, and the other end of the second side tube is connected to the liquid cooling unit. In this solution, the rotary joint can rotate along the circumference of the first side tube. When the cabinet door is opened or closed, the cross-door hose can rotate along the circumference of the first side tube along with the rotary joint. This can reduce the deformation of the cross-door hose in the process of moving with the cabinet door and increase the service life of the cross-door hose.

[0007] In combination with the first aspect, in a possible implementation, the second side tube extends along the stacking direction of the multiple battery packs, and the second side tube and the cross-door hose are connected via a rotary joint, and the rotary joint is used to rotate along the circumferential direction of the second side tube during the process of opening or closing the cabinet door. In this solution, the rotary joint can rotate along the axial direction of the second side tube, and when the cabinet door is opened or closed, the cross-door hose moves with the cabinet door, and the cross-door hose can rotate along the circumferential direction of the second side tube with the rotary joint, which can reduce the deformation of the cross-door hose in the process of moving with the cabinet door and increase the service life of the cross-door hose.

[0008] In combination with the first aspect, in a possible implementation, the hinge between the cabinet door and the cabinet body has a hinge axis for the cabinet door to rotate around, and the hinge axis is parallel to the extension direction of the first side tube, or the hinge axis is parallel to the extension direction of the second side tube. Since the hinge axis is parallel to the extension direction of the first side tube, the direction in which the cabinet door rotates relative to the cabinet body is consistent with the direction in which the cross-door hose rotates relative to the first side tube, and the relative rotation of the cross-door hose and the first side tube can reduce the deformation of the cross-door hose and increase the service life of the cross-door hose. The hinge axis is parallel to the extension direction of the second side tube, and the direction in which the cabinet door rotates relative to the cabinet body is consistent with the direction in which the cross-door hose rotates relative to the second side tube, and the relative rotation of the cross-door hose and the second side tube can reduce the deformation of the cross-door hose and increase the service life of the cross-door hose.

[0009] In combination with the first aspect, in a possible implementation, the first side tube is fixed on the side wall of the cabinet body hinged with the cabinet door; the second side tube is fixed on the end face of the cabinet door facing the multiple battery packs, and the second side tube is located on the side of the liquid cooling unit facing the hinge of the cabinet door and the cabinet body. Since the first side tube is located on the side of the battery pack facing the cabinet door in the depth direction of the cabinet body, and the first side tube is fixed on the side wall of the cabinet body hinged with the cabinet door, compared with the first side tube fixed on other side walls of the cabinet body, the first side tube is closer to the hinge axis of the cabinet door and the cabinet body. When the cabinet door rotates relative to the cabinet body, it is easier to drive the cross-door hose to rotate relative to the first side tube, which is beneficial to reduce the deformation of the cross-door hose when the cabinet door is relative to the cabinet body. Since the second side tube is located on the side of the liquid cooling unit facing the hinge of the cabinet door and the cabinet body, the second side tube is closer to the hinge axis of the cabinet door and the cabinet body. When the cabinet door rotates relative to the cabinet body, it is easier to drive the cross-door hose to rotate relative to the second side tube, which is beneficial to reduce the deformation of the cross-door hose when the cabinet door is relative to the cabinet body.

[0010] In combination with the first aspect, in a possible implementation, the liquid-cooled energy storage device further includes a liquid cooling unit, a cross-door hose, and a second side tube and a joint. The liquid cooling unit is fixed to the side of the cabinet door facing the battery pack, and the joint is fixed to the side wall of the liquid cooling unit facing the hinge of the cabinet door and the cabinet body and is connected to the liquid cooling unit. In the depth direction of the cabinet body, the joint has an interface facing the hinge of the cabinet door and the cabinet body, one end of the second side tube is connected to the interface of the joint, the other end of the second side tube is connected to one end of the cross-door hose, and the other end of the cross-door hose is connected to the first side tube. The side wall of the liquid cooling unit facing the hinge of the cabinet door and the cabinet body has a joint, and the joint has an interface facing the cabinet door and the cabinet body. Compared with the joint provided on other side walls of the liquid cooling assembly, the interface of the joint is closer to the hinge of the cabinet door and the cabinet body. Due to the interface of the second side tube connecting joint, the cross-door hose connects the second side tube and the first side tube, so that the second side tube can be closer to the first side tube. This can reduce the length of the cross-door hose, reduce the space occupied by the cross-door hose in the liquid-cooled energy storage device, and improve the energy density of the liquid-cooled energy storage device.

[0011] In combination with the first aspect, in a possible implementation, the branch pipe includes a corresponding liquid return branch pipe and a liquid supply branch pipe, the first side pipe includes a liquid supply side pipe and a liquid return side pipe, the battery pack is connected to the liquid supply side pipe through a liquid supply branch pipe, and the battery pack is connected to the liquid return side pipe through a liquid return branch pipe; the number of the liquid supply branches is greater than the number of battery packs; the liquid-cooled energy storage device also includes a bypass pipe, the bypass pipe is used to connect the corresponding liquid supply branch pipe not connected to the battery pack and the liquid return branch pipe not connected to the battery pack. The liquid cooling pipeline has a bypass pipe, each battery pack in the energy storage device is connected to the liquid return main pipe through a liquid return branch pipe, each battery in the energy storage device is connected to the liquid supply side pipe through a liquid supply branch pipe, and some of the liquid supply branches that are not connected to the battery pack are connected to the corresponding liquid return branches through the bypass pipe, so that the liquid cooling pipeline can be compatible with energy storage devices with battery packs equal to or less than the liquid supply branches. The bypass pipe can also adjust the flow rate of coolant supplied by the liquid cooling pipeline to each battery pack. If the total flow rate of the liquid supply side pipe is A, the flow rate of the bypass pipe is B, B<A, the number of battery packs is C, and the number of bypass pipes is N. If the number of battery packs is the same as the number of liquid supply branches, the corresponding number of liquid supply branches and return branches are connected through N bypass pipes. At this time, the liquid cooling pipeline supplies coolant to CN battery packs, and the flow rate of coolant for each battery pack supplied by the liquid cooling pipeline is (AB) / (CN), N<C. It should be noted that in the energy storage device, the number of bypass pipes N can be equal to the number of battery packs C. When calculating the flow rate of coolant supplied by the liquid cooling pipeline to the battery pack by the formula (AB) / (CN), the number of bypass pipes N needs to be less than the number of battery packs C.

[0012] In combination with the first aspect, in a possible implementation, the bypass pipe includes two adapters and a connecting pipe, one end of the connecting pipe is connected to the liquid supply branch pipe through an adapter, and the other end of the connecting pipe is connected to the liquid return branch pipe through another adapter. The connecting pipe is connected to the liquid supply branch pipe and the liquid return branch pipe respectively through two adapters, which can facilitate the disassembly and assembly of the bypass pipe. When it is necessary to add a battery pack, it is convenient to remove the bypass pipe so that the newly added battery pack is connected to the liquid cooling pipeline.

[0013] In combination with the first aspect, in a possible implementation, the liquid-cooled energy storage device also includes an energy storage inverter and a liquid cooling unit, the energy storage inverter is accommodated in the cabinet, and the energy storage inverter and the multiple battery packs are stacked in the height direction, and the energy storage inverter has a liquid cooling port; the liquid cooling unit is fixed to the end surface of the cabinet door facing the multiple battery packs, and the liquid cooling unit has a plurality of interfaces arranged in the height direction on the side wall facing the hinge of the cabinet door and the cabinet, and the plurality of interfaces of the liquid cooling unit are used to communicate with the two first side tubes, and one of the two first side tubes is used to communicate with the liquid cooling port of the multiple battery packs; the other of the two first side tubes is used to communicate with the liquid cooling port of the energy storage inverter. The heat generation of the battery pack and the energy storage inverter may be different. Each battery pack is connected to the liquid cooling unit through a liquid cooling pipeline. The liquid cooling unit can simultaneously serve multiple battery packs and energy storage inverters through two first side tubes. The liquid cooling unit is connected to the liquid cooling ports of multiple battery packs through a first side tube. The liquid cooling unit is connected to the liquid cooling ports of multiple battery packs through another first side tube. The two first side tubes can supply coolant with different flow rates to the battery pack and the energy storage inverter respectively, so as to achieve targeted heat dissipation for the battery pack and the energy storage inverter.

[0014] In combination with the first aspect, in a possible implementation, the first side pipe for connecting the energy storage converter includes a liquid supply side pipe and a liquid return side pipe; the liquid-cooled energy storage device also includes an on-off valve and a shunt pipe, the on-off valve is arranged on the shunt pipe, the on-off valve is used to control the shunt pipe to switch on and off the cooling liquid, one end of the shunt pipe is connected to the liquid supply side pipe, and the other end of the shunt pipe is connected to the liquid return side pipe. The on-off valve and the shunt pipe can control the flow of the cooling liquid flowing from the liquid supply side pipe to the battery pack. If the total flow of the liquid supply side pipe is A, the flow of the shunt pipe is B, B<A, and the number of energy storage converters is C. When the on-off valve is closed, the flow from the liquid supply side pipe to the shunt pipe is zero, at this time, the average flow supplied to the energy storage converter through the liquid supply side pipe is A / C. When the on-off valve is opened, the flow from the liquid supply side pipe to the shunt pipe is B, at this time, the average flow supplied to each battery pack through the liquid supply side pipe is (AB) / C. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the background technology, the drawings required for use in the embodiments of the present application or the background technology will be described below.

[0016] Figure 1 A schematic diagram of a three-dimensional structure of a liquid-cooled energy storage device provided in an embodiment of the present application, with the cabinet door in an open state;

[0017] Figure 2A top view of a liquid-cooled energy storage device provided in an embodiment of the present application, with the cabinet door in an open state;

[0018] Figure 3 A front view of a liquid-cooled energy storage device provided in an embodiment of the present application, with the cabinet door in an open state;

[0019] Figure 4 for Figure 3 A cross-sectional view of AA;

[0020] Figure 5 A top cross-sectional view of a liquid-cooled energy storage device in a closed state provided in one embodiment of the present application;

[0021] Figure 6 A schematic diagram of the structure of a liquid cooling pipeline provided in one embodiment of the present application;

[0022] Figure 7 A schematic diagram of the three-dimensional structure of another liquid-cooled energy storage device provided in one embodiment of the present application;

[0023] Figure 8 for Figure 3 Another cross-sectional view of AA.

[0024] Description of reference numerals:

[0025] 100, liquid-cooled energy storage device; 110, cabinet; 111, cabinet body; 112, cabinet door; 120, battery pack; 130, liquid cooling pipeline; 131, first side pipe; 131a, connecting joint; 131b, liquid supply side pipe; 131c, liquid return side pipe; 132, branch pipe; 132a, liquid supply branch pipe; 132b, liquid return branch pipe; 133, rotary joint; 134, cross-door hose; 135, second side pipe; 140, liquid cooling unit; 141, joint; 150, bypass pipe; 151, adapter; 152, connecting pipe; 160, energy storage converter; 170, on-off valve; 180, shunt pipe. DETAILED DESCRIPTION

[0026] Energy storage devices play an important role in the process of renewable energy power generation (such as wind power generation, photovoltaic power generation, etc.). By storing and releasing energy, energy storage devices can stabilize the power generation system, provide energy backup, and improve the quality of electricity. They have good application prospects.

[0027] With the development of energy storage devices, the energy density of energy storage devices has received more and more attention. When the energy storage device is working (discharging or charging), it may generate a lot of heat energy, which will not only reduce the service life of the energy storage device, but also threaten the safety of the use of the energy storage device.

[0028] A liquid cooling pipeline is provided in the energy storage device. The liquid-cooled energy storage device is cooled by circulating coolant in the liquid cooling pipeline, which can reduce the temperature of the liquid-cooled energy storage device during operation. However, unreasonable arrangement of the liquid cooling pipeline will have a negative impact on the energy density of the energy storage device.

[0029] In view of this, the present application provides a liquid-cooled energy storage device, aiming to solve the problem of unreasonable arrangement of liquid cooling pipelines and thus reducing the energy density of the energy storage device.

[0030] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings.

[0031] In the examples provided in this application, see Figure 1 and Figure 2 The liquid-cooled energy storage device 100 includes a cabinet 110, a first side pipe 131, a cross-door hose 134, a second side pipe 135, a plurality of branch pipes 132, a liquid cooling unit 140, a plurality of battery packs 120 and a plurality of rotary joints 133.

[0032] The cabinet 110 includes a cabinet body 111 and a cabinet door 112, the cabinet body 111 and the cabinet door 112 are hinged, the cabinet body 111 is provided with a storage space with an opening, a plurality of battery packs 120 are stacked along the height direction of the cabinet body 111, and the plurality of battery packs 120 are stored in the storage space of the cabinet body 111. The plurality of battery packs 120 stored in the storage space may be connected in series or in parallel with each other. Among the plurality of battery packs 120 stored in the storage space, some of the battery packs 120 may be connected in series, and some of the battery packs 120 may be connected in parallel.

[0033] The cabinet door 112 has an open state and a closed state, and the cabinet door 112 can rotate relative to the cabinet body 111 to switch between the open state and the closed state. When the cabinet door 112 is in the closed state, the cabinet door 112 seals the opening of the storage space. When the cabinet door 112 is in the open state, it is convenient for the user to maintain the battery pack 120 in the cabinet body 111.

[0034] For ease of understanding, the depth direction of the cabinet 111 is defined as the X-axis direction, the width direction of the cabinet 111 is defined as the Y-axis direction, and the height direction of the cabinet 111 is defined as the Z-axis direction.

[0035] In the present application, the stacking direction of the plurality of battery packs 120 may be the height direction of the cabinet 111 .

[0036] See also Figure 3 , Figure 4 and Figure 5The first side tube 131 is used for circulating the cooling liquid. The first side tube 131 extends along the stacking direction of the multiple battery packs 120. In the depth direction of the cabinet 111, the first side tube 131 is located on the side of the battery pack 120 facing the cabinet door 112. When the cabinet door 112 is in a closed state, in order to avoid interference between the cabinet door 112 and the battery pack 120, a certain reserved gap is reserved between the cabinet door 112 and the battery pack 120 in the depth direction of the cabinet 111. In the depth direction of the cabinet 111, the first side tube 131 is located on the side of the battery pack 120 facing the cabinet door 112, which can effectively utilize the reserved gap between the cabinet door 112 and the battery pack 120 in the depth direction of the cabinet 111. In this way, the first side tube 131 will not occupy the space of the cabinet 111 in the width direction, thereby effectively improving the energy density of the liquid-cooled energy storage device.

[0037] The first side tube 131 is provided with a plurality of connection joints 131a at intervals in the extension direction, and the connection joints 131a have interfaces facing the battery pack 120 along the depth direction of the cabinet 111. Each battery pack 120 has a liquid cooling port, which is provided on the end surface of the battery pack 120 facing the cabinet door 112 (when the cabinet door 112 is in a closed state). The liquid cooling ports of the plurality of battery packs 120 are arranged at intervals along the height direction of the cabinet 111. The plurality of branch pipes 132 are used to connect the interfaces of the plurality of connection joints 131a and the liquid cooling ports of the plurality of battery packs 120. Since the interface of the connecting joint 131a connecting the branch pipe 132 and the first side pipe 131 is oriented toward the battery pack 120 along the depth direction of the cabinet 111, it can be obtained that one end of the branch pipe 132 is connected to the interface of the connecting joint 131a along the depth direction of the cabinet 111. Since the first side pipe 131 is located on the side of the battery pack 120 facing the cabinet door 112 in the depth direction of the cabinet 111, the connection between the branch pipe 132 and the connecting joint 131a in the depth direction of the cabinet 111 can reduce the space occupied by the branch pipe 132 in the width direction of the cabinet 111, effectively utilize the space between the first side pipe 131 and the battery pack 120 in the depth direction of the cabinet 111, and improve the energy density of the liquid-cooled energy storage device.

[0038] In order to facilitate the branch pipe 132 to connect the connection joint 131 a on the first side pipe 131 and the liquid cooling port of the battery pack 120 , the branch pipe 132 may be a flexible hose.

[0039] In the embodiment provided in the present application, the first side tube 131 is connected to the cross-door hose 134 through the rotary joint 133, and the rotary joint 133 is used to rotate along the circumference of the first side tube 131 during the process of opening or closing the cabinet door 112. The cross-door hose 134 is a flexible hose, and when the cabinet door 112 is opened or closed, the cross-door hose 134 can be deformed without interfering with the state switching of the cabinet door 112. The rotary joint 133 can rotate along the circumference of the first side tube 131, and when the cabinet door 112 is opened or closed, the cross-door hose 134 can rotate along the circumference of the first side tube 131 with the rotary joint 133, so that the rotary joint 133 can absorb the stress on the cross-door hose 134, and can reduce the deformation of the cross-door hose 134 during the movement with the cabinet door 112, thereby increasing the service life of the cross-door hose 134.

[0040] The cross-door hose 134 is also connected to the second side tube 135 through a rotary joint 133, and the second side tube 135 extends along the stacking direction of the multiple battery packs 120. The rotary joint 133 is used to rotate along the circumferential direction of the second side tube 135 during the opening or closing of the cabinet door 112, and the second side tube 135 is connected to the liquid cooling unit 140. The rotary joint 133 can rotate along the axial direction of the second side tube 135. When the cabinet door 112 is opened or closed, the cross-door hose 134 moves with the cabinet door 112, and the cross-door hose 134 can rotate along the circumferential direction of the second side tube 135 with the rotary joint 133, so that the rotary joint 133 can absorb the stress on the cross-door hose 134, reduce the deformation of the cross-door hose 134 during the movement with the cabinet door 112, and improve the service life of the cross-door hose 134.

[0041] In the embodiment provided in the present application, the cabinet door 112 is hinged with the cabinet body 111 and has a hinge axis. When the cabinet door 112 is opened or closed, the cabinet door 112 rotates around the hinge axis. The hinge axis can be parallel to the extension direction of the first side tube 131. It can be understood that the hinge axis extends along the height direction of the cabinet body 111. The direction in which the cabinet door 112 rotates relative to the cabinet body 111 is consistent with the direction in which the cross-door hose 134 rotates relative to the first side tube 131. The relative rotation of the cross-door hose 134 and the first side tube 131 can reduce the deformation of the cross-door hose 134 and increase the service life of the cross-door hose 134.

[0042] The hinge axis can also be parallel to the extension direction of the second side tube 135. The direction in which the cabinet door 112 rotates relative to the cabinet body 111 is consistent with the direction in which the cross-door hose 134 rotates relative to the second side tube 135. The relative rotation of the cross-door hose 134 and the second side tube 135 can reduce the deformation of the cross-door hose 134 and increase the service life of the cross-door hose 134.

[0043] In the embodiment provided in the present application, the first side tube 131 is fixed on the side wall of the cabinet 111 hinged with the cabinet door 112; the second side tube 135 is fixed on the end surface of the cabinet door 112 facing the multiple battery packs 120, and the second side tube 135 is located on the side of the liquid cooling unit 140 facing the hinge of the cabinet door 112 and the cabinet 111. Since the first side tube 131 is located on the side of the battery pack 120 facing the cabinet door 112 in the depth direction of the cabinet 111, and the first side tube 131 is fixed on the side wall of the cabinet 111 hinged with the cabinet door 112, compared with the first side tube 131 fixed on other side walls of the cabinet 111, the first side tube 131 is closer to the hinge axis of the cabinet door 112 and the cabinet 111. When the cabinet door 112 rotates relative to the cabinet 111, it is easier to drive the cross-door hose 134 to rotate relative to the first side tube 131, which is conducive to reducing the deformation of the cross-door hose 134 when the cabinet door 112 is relative to the cabinet 111. Since the second side tube 135 is located on the side of the liquid cooling unit 140 facing the hinge of the cabinet door 112 and the cabinet body 111, the second side tube 135 is closer to the hinge axis of the cabinet door 112 and the cabinet body 111. When the cabinet door 112 rotates relative to the cabinet body 111, it is easier to drive the cross-door hose 134 to rotate relative to the second side tube 135, which is beneficial to reduce the deformation of the cross-door hose 134 when the cabinet door 112 is relative to the cabinet body 111. Among them, the first side tube 131 and the second side tube 135 are close to the hinge of the cabinet door 112 and the cabinet body 111, which can shorten the size of the cross-door hose 134 connecting the first side tube 131 and the second side tube 135, reduce the space occupied by the cross-door hose 134 in the liquid-cooled energy storage device, and improve the energy density of the liquid-cooled energy storage device. Shortening the size of the cross-door hose 134 connecting the first side tube 131 and the second side tube 135 can also reduce the cost of manufacturing the liquid-cooled energy storage device. By shortening the size of the cross-door hose 134 connecting the first side tube 131 and the second side tube 135 , the flow path of the coolant from the liquid cooling unit 140 to the battery pack 120 can be shortened, and the cooling efficiency of the coolant can be improved.

[0044] See also Figure 6 The first side pipe 131 includes a liquid supply side pipe 131b and a liquid return side pipe 131c. The liquid supply side pipe 131b extends along the stacking direction of the multiple battery packs 120. The liquid supply side pipe 131b is provided with a plurality of spaced connection joints 131a in the extending direction. The liquid return side pipe 131c extends along the stacking direction of the multiple battery packs 120. The liquid return side pipe 131c is provided with a plurality of spaced connection joints 131a in the extending direction. The connection joints 131a provided on the liquid supply side pipe 131b and the connection joints 131a provided on the liquid return side pipe 131c both have interfaces along the depth direction of the cabinet 111.

[0045] Each branch pipe 132 includes a liquid supply branch pipe 132a and a liquid return branch pipe 132b. The connecting joint 131a on the liquid supply side pipe 131b is connected to the liquid cooling port of the battery pack 120 through the liquid supply branch pipe 132a, and the connecting joint 131a on the liquid return side pipe 131c is connected to the liquid cooling port of the battery pack 120 through the liquid return branch pipe 132b.

[0046] The number of the cross-door hoses 134 can be two, the number of the second side tubes 135 can be two, one cross-door hose 134 is connected to the liquid supply side tube 131b and one second side tube 135, and the other cross-door hose 134 is connected to the liquid return side tube 131c and the other second side tube 135. The two cross-door hoses 134, the two second side tubes 135, the liquid supply side tube 131b and the liquid return side tube 131c form a liquid cooling pipeline 130.

[0047] Specifically, the coolant can flow from the liquid cooling unit 140 to a second side pipe 135, a cross-door hose 134, a liquid supply side pipe 131b, a liquid supply branch pipe 132a, and then enter the battery pack 120, where the coolant absorbs the heat of the battery pack 120. After absorbing the heat of the battery pack 120, the coolant is discharged from the battery pack 120. The coolant discharged from the battery pack 120 flows through the liquid return branch pipe 132b, the liquid return side pipe 131c, another cross-door hose 134, and another second side pipe 135, and flows to the liquid cooling unit 140. The liquid coolant circulates in the liquid cooling unit 140 and the battery pack 120 to continuously absorb the heat of the battery pack 120, thereby reducing the temperature of the battery pack 120. Among them, the liquid cooling unit 140 can reduce the temperature of the coolant. After the coolant absorbs the heat of the battery pack 120 and flows to the liquid cooling unit 140, the liquid cooling unit 140 cools the coolant, and the cooled coolant flows into the battery pack 120 to absorb the heat of the battery pack 120.

[0048] In the embodiment provided in the present application, the first side tube 131 is fixed on the side wall of the cabinet 111 hinged to the cabinet door 112. Since the first side tube 131 is located on the side of the battery pack 120 facing the cabinet door 112 in the depth direction of the cabinet 111, and the first side tube 131 is fixed on the side wall of the cabinet 111 hinged to the cabinet door 112, compared with the first side tube 131 fixed on other side walls of the cabinet 111, the first side tube 131 is closer to the hinge axis between the cabinet door 112 and the cabinet 111. When the cabinet door 112 rotates relative to the cabinet 111, it is easier to drive the cross-door hose 134 to rotate relative to the first side tube 131, which is beneficial to reduce the deformation of the cross-door hose 134 when the cabinet door 112 is relative to the cabinet 111, reduce the stress borne by the cross-door hose 134, and improve the service life of the cross-door hose 134.

[0049] The second side tube 135 is fixed on the end surface of the cabinet door 112 facing the battery pack 120 (when the cabinet door 112 is in a closed state), and the second side tube 135 is fixed on the side wall of the liquid cooling unit 140 facing the hinge of the cabinet door 112 and the cabinet body 111. Since the second side tube 135 is located on the side of the liquid cooling unit 140 facing the hinge of the cabinet door 112 and the cabinet body 111, the second side tube 135 is closer to the hinge axis of the cabinet door 112 and the cabinet body 111. When the cabinet door 112 rotates relative to the cabinet body 111, it is easier to drive the cross-door hose 134 to rotate relative to the second side tube 135, which is beneficial to reduce the deformation of the cross-door hose 134 when the cabinet door 112 is relative to the cabinet body 111.

[0050] In the embodiment provided in the present application, the side wall of the liquid cooling unit 140 facing the hinge of the cabinet door 112 and the cabinet body 111 is provided with a joint 141, and the joint 141 has an interface facing the hinge of the cabinet door 112 and the cabinet body 111. Specifically, one end of the second side pipe 135 is connected to the interface of the joint 141 provided on the liquid cooling unit 140, and the other end of the second side pipe 135 is connected to one end of the cross-door hose 134, and the other end of the cross-door hose 134 is connected to the first side pipe 131. The side wall of the liquid cooling unit 140 facing the hinge of the cabinet door 112 and the cabinet body 111 is provided with a joint 141, and the joint 141 has an interface facing the cabinet door 112 and the cabinet body 111. Compared with other side walls of the liquid cooling assembly provided with the joint 141, the interface of the joint 141 is closer to the hinge of the cabinet door 112 and the cabinet body 111. Since the second side tube 135 is connected to the interface of the joint 141, the cross-door hose 134 is connected to the second side tube 135 and the first side tube 131, the second side tube 135 can be obtained to be closer to the first side tube 131, which can reduce the length of the cross-door hose 134, reduce the space occupied by the cross-door hose 134 in the liquid-cooled energy storage device, and improve the energy density of the liquid-cooled energy storage device.

[0051] In the embodiment provided in the present application, the branch pipe 132 includes a corresponding liquid return branch pipe 132b and a liquid supply branch pipe 132a, the first side pipe 131 includes a liquid supply side pipe 131b and a liquid return side pipe 131c, the battery pack 120 is connected to the liquid supply side pipe 131b through a liquid supply branch pipe 132a, and the battery pack 120 is connected to the liquid return side pipe 131c through a liquid return branch pipe 132b; the number of liquid supply branches 132a can be equal to the number of battery packs 120, and the number of liquid supply branches 132a can also be more than the number of battery packs 120.

[0052] See also Figure 7 When the number of liquid supply branches 132a is greater than the number of battery packs 120, the liquid-cooled energy storage device also includes a bypass pipe 150, which is used to connect the corresponding liquid supply branches 132a that are not connected to the battery pack 120 and the liquid return branches 132b that are not connected to the battery pack 120.

[0053] The liquid cooling circuit 130 has a bypass pipe 150. Each battery pack 120 in the energy storage device is connected to the liquid return main pipe through a liquid return branch pipe 132b. Each battery in the energy storage device is connected to the liquid supply side pipe 131b through a liquid supply branch pipe 132a. Some of the liquid supply branches 132a that are not connected to the battery pack 120 are connected to the corresponding liquid return branch pipe 132b through the bypass pipe 150, so that the liquid cooling circuit 130 can be compatible with energy storage devices with battery packs 120 equal to or less than the liquid supply branch. The bypass pipe 150 can also adjust the flow rate of the coolant supplied by the liquid cooling circuit 130 to each battery pack 120. If the total flow rate of the liquid cooling circuit 130 is A, the flow rate of the bypass pipe 150 is B, B<A, the number of battery packs 120 is C, and the number of bypass pipes 150 is N. If the number of battery packs 120 is the same as that of the liquid supply branch pipes 132a, the corresponding number of liquid supply branch pipes 132a and liquid return branch pipes 132b are connected through N bypass pipes 150. At this time, the liquid cooling pipeline 130 supplies coolant to CN battery packs 120, and the flow rate of coolant for each battery pack 120 supplied by the liquid cooling pipeline 130 is (AB) / (CN), N<C. It should be noted that in the energy storage device, the number N of bypass pipes 150 can be equal to the number C of battery packs 120. When calculating the flow rate of coolant supplied by the liquid cooling pipeline 130 to the battery pack 120 by the formula (AB) / (CN), the number N of bypass pipes 150 needs to be less than the number C of battery packs 120.

[0054] The bypass pipe 150 includes two adapters 151 and a connecting pipe 152. The connecting pipe 152 is roughly U-shaped. One end of the connecting pipe 152 is connected to the liquid supply branch pipe 132a through an adapter 151, and the other end of the bypass pipe 150 is connected to the liquid return branch pipe 132b through another adapter 151. Since the connecting pipe 152 is connected to the liquid supply branch pipe 132a and the liquid return branch pipe 132b respectively through two adapters 151, the bypass pipe 150 can be easily disassembled and assembled. When it is necessary to add a battery pack 120, it is convenient to remove the bypass pipe 150 so that the newly added battery pack 120 is connected to the liquid cooling pipeline 130. Specifically, the newly added battery pack 120 is connected to the liquid supply side pipe 131b and the liquid return side pipe 131c through the liquid supply branch pipe 132a and the liquid return branch pipe 132b respectively.

[0055] In the embodiment provided in the present application, both adapters 151 extend along the depth direction of the cabinet 111. When the bypass pipe 150 is connected with the corresponding liquid supply branch pipe 132a and the liquid return branch pipe 132b, the liquid supply branch pipe 132a is connected to one adapter 151 along the depth direction of the cabinet 111, and the liquid return branch pipe 132b is connected to the other adapter 151 along the depth direction of the cabinet 111.

[0056] The liquid-cooled energy storage device also includes an energy storage inverter 160 (Power Conversion System, PCS), which is accommodated in the cabinet 111, and the energy storage inverter 160 and multiple battery packs 120 are stacked in the height direction, and the energy storage inverter 160 can be electrically connected to the battery pack 120. The energy storage inverter 160 can control the charging and discharging process of the battery pack 120 to achieve AC-DC conversion. For example, the energy storage inverter 160 can convert the AC power of the AC power supply into DC power to charge the battery pack 120. The energy storage inverter 160 can also convert the DC power of the battery pack 120 into AC power to power a load that uses AC power.

[0057] The energy storage inverter 160 also generates heat during operation. The liquid-cooled energy storage device 100 has two liquid cooling pipelines 130 . The liquid cooling unit 140 is connected to the multiple battery packs 120 through one liquid cooling pipeline 130 , and the liquid cooling unit 140 is connected to the energy storage inverter 160 through another liquid cooling pipeline 130 .

[0058] Specifically, the energy storage inverter 160 has a liquid cooling port; the liquid cooling port of the energy storage inverter 160 is arranged on the end surface of the energy storage inverter 160 facing the cabinet door 112 (when the cabinet door 112 is in a closed state), and the liquid cooling unit 140 has a plurality of joints arranged along the height direction on the side wall facing the hinge of the cabinet door 112 and the cabinet body 111, and the plurality of joints of the liquid cooling unit 140 are used to communicate with the two first side tubes 131, and one of the two first side tubes 131 is used to communicate with the liquid cooling ports of multiple battery packs 120; the other of the two first side tubes 131 is used to communicate with the liquid cooling port of the energy storage inverter. The heat generation of the battery pack 120 and the energy storage inverter may be different. Each battery pack 120 is connected to the liquid cooling unit 140 through a liquid cooling pipeline 130. The liquid cooling unit 140 can simultaneously serve multiple battery packs 120 and energy storage inverters through two first side tubes 131. The liquid cooling unit 140 is connected to the liquid cooling ports of multiple battery packs 120 through a first side tube 131. The liquid cooling unit 140 is connected to the liquid cooling ports of multiple battery packs 120 through another first side tube 131. The two first side tubes 131 can supply different flow rates of coolant to the battery pack 120 and the energy storage inverter respectively, so as to achieve targeted heat dissipation for the battery pack 120 and the energy storage inverter.

[0059] In the embodiment provided in the present application, the liquid cooling pipeline 130 used to connect the energy storage inverter 160 specifically includes a liquid supply branch pipe 132a, a liquid return branch pipe 132b, a liquid supply side pipe 131b, a liquid return side pipe 131c, a plurality of rotary joints 133, two cross-door hoses 134 and two second side pipes 135. Among them, the liquid supply branch pipe 132a is used to connect the energy storage inverter and the liquid supply side pipe 131b, the liquid supply side pipe 131b is connected to one of the two cross-door hoses 134 through a rotary joint 133, one cross-door hose 134 is connected to one of the two second side tubes 135, one second side tube 135 is also connected to the liquid cooling unit 140, the liquid cooling unit 140 is also connected to the other second side tube 135 of the two second side tubes 135, the other second side tube 135 is connected to the other cross-door hose 134 of the two cross-door hoses 134, the other cross-door hose 134 is connected to the return liquid side pipe 131c through the rotary joint 133, and the return liquid side pipe 131c is connected to the energy storage inverter through multiple return liquid branches 132b.

[0060] See also Figure 8The liquid-cooled energy storage device 100 also includes an on-off valve 170 and a shunt pipe 180. The on-off valve 170 is arranged on the shunt pipe 180, and the shunt pipe 180 is roughly U-shaped. The on-off valve 170 is used to control the shunt pipe 180 to turn on and off the cooling liquid. One end of the shunt pipe 180 is connected to the liquid supply side pipe 131b, and the other end of the shunt pipe 180 is connected to the liquid return side pipe 131c. When the on-off valve 170 is in a closed state, all the cooling liquid flowing through the liquid supply side pipe 131b in the liquid cooling pipeline 130 used to connect the liquid cooling unit 140 and the energy storage converter flows through the energy storage converter, and the cooling liquid flowing through the energy storage converter flows back to the liquid cooling unit 140 through the liquid return side pipe 131c in the liquid cooling pipeline 130, and the cycle continues. When the on-off valve 170 is in the open state, part of the coolant flowing through the liquid supply side pipe 131b flows into the energy storage converter, and the coolant flowing through the energy storage converter 160 flows back to the return liquid side pipe 131c. Another part of the coolant flowing through the liquid supply side pipe 131b flows back to the return liquid side pipe 131c directly through the shunt pipe 180 without passing through the energy storage converter. The flow rate of the coolant flowing from the liquid supply side pipe 131b to the battery pack 120 can be controlled by the on-off valve 170 and the shunt pipe 180. If the total flow rate of the liquid supply side pipe 131b is A, the flow rate of the shunt pipe 180 is B, B<A, and the number of energy storage converters 160 is C. When the on-off valve 170 is closed, the flow rate from the liquid supply side pipe 131b to the shunt pipe 180 is zero. At this time, the average flow rate supplied to the energy storage converter 160 through the liquid supply side pipe 131b is A / C. When the on-off valve 170 is opened, the flow rate flowing from the liquid supply side pipe 131b to the shunt pipe 180 is B. At this time, the average flow rate supplied to each battery pack 120 through the liquid supply side pipe 131b is (AB) / C. Specifically, when the temperature of the energy storage inverter 160 is high, it is necessary to improve the cooling effect of the coolant cooling the energy storage inverter 160. At this time, the on-off valve 170 can be closed to increase the flow rate of the coolant flowing through the energy storage inverter 160. When the temperature of the energy storage inverter 160 is low, the on-off valve 170 can be opened to reduce the flow rate of the coolant flowing through the energy storage inverter 160.

[0061] The first, second, third, fourth and various numerical numbers involved in this document are only distinguished for the convenience of description and are not intended to limit the scope of the present application.

[0062] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0063] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A liquid-cooled energy storage device, characterized in that: include: A cabinet, comprising a cabinet body and a cabinet door, wherein the cabinet door is hinged to the cabinet body; A plurality of stacked battery packs, wherein the plurality of battery packs are accommodated in the cabinet; The plurality of battery packs have a plurality of liquid cooling ports, the plurality of liquid cooling ports are arranged at intervals in the stacking direction of the plurality of battery packs, and the plurality of liquid cooling ports are used to circulate cooling liquid; a first side tube extending along the stacking direction of the plurality of battery packs, the first side tube being used for circulating the coolant, the first side tube being arranged in the cabinet, and being located on a side of the battery pack facing the cabinet door in the depth direction of the cabinet, a plurality of connection joints being arranged at intervals in the extending direction of the first side tube, and each of the connection joints having an interface facing the plurality of battery packs in the depth direction of the cabinet; A plurality of branch pipes are used to connect the interfaces of the plurality of connection joints and the liquid cooling ports of the plurality of battery packs.

2. The liquid-cooled energy storage device according to claim 1, characterized in that: The liquid-cooled energy storage device also includes a liquid cooling unit, a cross-door hose, a second side tube and a rotating joint. The liquid cooling unit is fixed to the end surface of the cabinet door facing the battery pack. One end of the cross-door hose is connected to the first side tube through a rotating joint. The rotating joint is used to rotate along the circumference of the first side tube during the opening or closing of the cabinet door. The other end of the cross-door hose is connected to one end of the second side tube, and the other end of the second side tube is connected to the liquid cooling unit.

3. The liquid-cooled energy storage device according to claim 2, characterized in that: The second side tube extends along the stacking direction of the multiple battery packs, and the second side tube is connected to the cross-door hose via a rotating joint, and the rotating joint is used to rotate along the circumferential direction of the second side tube during the opening or closing of the cabinet door.

4. The liquid-cooled energy storage device according to claim 2 or 3, characterized in that: The hinge between the cabinet door and the cabinet body has a hinge axis for the cabinet door to rotate around, and the hinge axis is parallel to the extension direction of the first side tube, or the hinge axis is parallel to the extension direction of the second side tube.

5. The liquid-cooled energy storage device according to claim 2 or 3, characterized in that: The first side tube is fixed to a side wall of the cabinet body hinged to the cabinet door; The second side tube is fixed to the end surface of the cabinet door facing the multiple battery packs, and the second side tube is located on a side of the liquid cooling unit facing the hinge between the cabinet door and the cabinet body.

6. The liquid-cooled energy storage device according to claim 1, characterized in that: The liquid-cooled energy storage device also includes a liquid cooling unit, a cross-door hose, a second side pipe and a joint. The liquid cooling unit is fixed to the side of the cabinet door facing the battery pack, and the joint is fixed to the side wall of the liquid cooling unit facing the hinge between the cabinet door and the cabinet body and is connected to the liquid cooling unit. In the depth direction of the cabinet body, the joint has an interface facing the hinge between the cabinet door and the cabinet body, one end of the second side pipe is connected to the interface of the joint, the other end of the second side pipe is connected to one end of the cross-door hose, and the other end of the cross-door hose is connected to the first side pipe.

7. The liquid-cooled energy storage device according to claim 1, characterized in that: Each of the branch pipes includes a corresponding liquid return branch pipe and a liquid supply branch pipe, the first side pipe includes a liquid supply side pipe and a liquid return side pipe, the battery pack is connected to the liquid supply side pipe via a liquid supply branch pipe, and the battery pack is connected to the liquid return side pipe via a liquid return branch pipe; the number of the liquid supply branch pipes is greater than the number of the battery packs; The liquid-cooled energy storage device also includes a bypass pipe, which is used to connect the corresponding liquid supply branch pipe not connected to the battery pack and the liquid return branch pipe not connected to the battery pack.

8. The liquid-cooled energy storage device according to claim 7, characterized in that: The bypass pipe includes two adapters and a connecting pipe. One end of the connecting pipe is connected to the liquid supply branch pipe through an adapter, and the other end of the connecting pipe is connected to the liquid return branch pipe through another adapter.

9. The liquid-cooled energy storage device according to any one of claims 1 to 3, characterized in that: The liquid-cooled energy storage device further includes an energy storage converter and a liquid cooling unit, wherein the energy storage converter is accommodated in the cabinet, and the energy storage converter and the plurality of battery packs are stacked in a height direction, and the energy storage converter has a liquid cooling port; The liquid cooling unit is fixed to the end surface of the cabinet door facing the multiple battery packs. The liquid cooling unit has a plurality of joints arranged along the height direction on the side wall facing the hinge between the cabinet door and the cabinet body. The plurality of joints of the liquid cooling unit are used to communicate with the two first side tubes, one of the two first side tubes is used to communicate with the liquid cooling ports of the multiple battery packs; the other of the two first side tubes is used to communicate with the liquid cooling port of the energy storage inverter.

10. The liquid-cooled energy storage device according to claim 9, characterized in that: The first side pipe used to connect the energy storage converter includes a liquid supply side pipe and a liquid return side pipe; the liquid-cooled energy storage device also includes an on-off valve and a shunt pipe, the on-off valve is arranged on the shunt pipe, the on-off valve is used to control the shunt pipe to turn on and off the cooling liquid, one end of the shunt pipe is connected to the liquid supply side pipe, and the other end of the shunt pipe is connected to the liquid return side pipe.

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