An energy storage battery pack and an energy storage system

Abstract

The present application discloses an energy storage battery pack and an energy storage system. The energy storage battery pack includes a liquid cooling plate structure; a battery module is disposed on the liquid cooling plate structure and includes a plurality of series-connected and sequentially arranged battery cells; a radiator structure is disposed on at least one side of the battery module and includes a plate body and a heat dissipation component. A plurality of heat dissipation fins are spacedly arranged on one side surface of the plate body, and the heat dissipation component is disposed on the other side surface of the plate body opposite to the heat dissipation fins. Each heat dissipation fin is respectively inserted between adjacent battery cells and contacts the battery cells on both sides. By combining liquid cooling heat dissipation using a bottom liquid cooling plate structure and air cooling heat dissipation of a side radiator structure to dissipate heat from the battery pack, the overall heat dissipation effect is improved, the temperature difference between the top and bottom of the battery cells in the battery module is significantly reduced, the temperature uniformity among the battery cells is improved, the service life of the battery module is extended. At the same time, the battery module combines air cooling and liquid cooling, which is relatively easy to implement in terms of process, and the overall cost is low, and large-rate charge and discharge can be achieved in a low-cost manner.

Description

Technical Field

[0001] This application relates to the technical field of battery pack cooling, and particularly relates to an energy storage battery pack and an energy storage system. Background Art

[0002] Traditional energy storage systems mainly adopt air cooling as the main method, and some industrial and commercial and large container energy storage systems are gradually changing from air cooling to liquid cooling. Among them, the air cooling method has low heat dissipation efficiency. Currently, liquid-cooled battery packs mainly use bottom liquid cooling, but the liquid-cooled battery packs mainly dissipate heat from the bottom, resulting in a phenomenon of hot at the top and cold at the bottom. Under this heat dissipation method, the temperature difference between the top and bottom of the battery cells is large, and the thermal conductivity is poor. And currently, the battery cells in energy storage liquid-cooled battery packs are all large battery cells, and the dimensions of the length, width, and height of the battery cells are relatively large, especially the dimensions in height and width are large. This will lead to a large temperature difference between the battery cells, especially in the height direction. If charged or discharged at a rate of 1C or above, the overall temperature of the battery cells will be relatively high, and the overall temperature rise and temperature consistency of the battery pack are poor, affecting the service life of the battery cells.

[0003] Furthermore, currently in the market, the air-cooled battery packs mainly have an air duct directly flowing out from the module. The temperatures of the battery cells on both sides of the module will be relatively low, and the overall protection level of the battery pack is low, and the heat dissipation effect is poor. The liquid-cooled battery packs in the market mainly use bottom cooling, but the bottom cooling method has the phenomenon of hot at the top and cold at the bottom of the battery cells, resulting in too large a temperature difference between the battery cells. There are problems of too high price cost, too complex liquid cooling pipelines, and too large process difficulty in bottom and side liquid cooling of the battery cells. Summary of the Invention

[0004] The purpose of this application is to at least solve one of the technical problems existing in the prior art. For this reason, this application proposes an energy storage battery pack, which can improve the heat dissipation effect of the battery pack as a whole, significantly reduce the temperature difference between the top and bottom of the battery cells in the battery module, improve the temperature uniformity between the battery cells, and extend the service life of the battery pack.

[0005] This application also proposes an energy storage system including the above energy storage battery pack.

[0006] The energy storage battery pack according to the first aspect embodiment of this application includes:

[0007] A liquid cooling plate structure;

[0008] At least one battery module, arranged on the liquid cooling plate structure, and the battery module includes a plurality of battery cells connected in series and arranged in sequence;

[0009] The radiator structure is disposed on at least one side of the battery module. The radiator structure includes a plate body and a heat dissipation component. A plurality of heat sinks are spacedly arranged on one side surface of the plate body, and the heat dissipation component is disposed on the other side surface of the plate body opposite to the heat sinks. Each of the heat sinks is respectively inserted between adjacent battery cells and contacts the battery cells on both sides.

[0010] The energy storage battery pack according to the embodiment of the first aspect of the present application has at least the following beneficial effects: By combining liquid cooling heat dissipation using the bottom liquid cooling plate structure and air cooling heat dissipation of the side radiator structure to dissipate heat from the battery pack, the overall heat dissipation effect of the battery pack is improved, the temperature difference between the top and bottom of the battery cells in the battery module is significantly reduced, the temperature uniformity between the battery cells is improved, the service life of the battery module is extended. At the same time, the battery module combines air cooling and liquid cooling, which is relatively easy to implement in terms of process, and the overall cost is low, and large-rate charge and discharge can be achieved in a low-cost manner.

[0011] For the energy storage battery pack according to the embodiment of the first aspect of the present application, the liquid cooling plate structure is connected to the battery module through a thermally conductive structural adhesive;

[0012] And / or the heat sink contacts the battery cell through a thermally conductive structural adhesive or a thermally conductive pad.

[0013] For the energy storage battery pack according to the embodiment of the first aspect of the present application, external fins are provided on the other side surface of the plate body opposite to the heat sinks, and the heat dissipation component is adapted to cool the external fins.

[0014] For the energy storage battery pack according to the embodiment of the first aspect of the present application, the battery module further includes an integrated busbar assembly and a fixing seat. The battery cells are arranged in at least two columns in sequence, and adjacent battery cells in each column are connected in series through the integrated busbar assembly. The integrated busbar assembly is disposed on the fixing seat and is adapted to collect information of the battery cells.

[0015] For the energy storage battery pack according to the embodiment of the first aspect of the present application, the radiator structure further includes end plates. Each end plate is disposed on the fixing seat and is respectively located at both ends in the length direction of the battery module. Each end plate and each plate body are adapted to cooperate with each other to fix each battery cell.

[0016] For the energy storage battery pack according to the embodiment of the first aspect of the present application, an insulating plate is provided between the end plate and the battery cell; and / or a flexible cushion layer is provided on the inner side of the end plate for insulation between the end plate and the battery cell.

[0017] The energy storage battery pack according to the embodiment of the first aspect of the present application, wherein the end plate is provided with a first hole for guiding the wire harness of the integrated busbar assembly, so that the wire harness of the integrated busbar assembly is adapted to extend along a preset trajectory; and / or the end plate is provided with a mounting structure for stacking.

[0018] The energy storage battery pack according to the embodiment of the first aspect of the present application, wherein the fixing seat is provided with a buckle and a guiding member, the end plate is provided with a second hole, and the fixing seat is snap-connected to the end plate through the buckle installed in the second hole, and the guiding member is adapted to guide the installation of the buckle;

[0019] and / or the fixing seat is provided with a mounting groove, the integrated busbar assembly is provided with a mating member, and the integrated busbar assembly is connected to the fixing seat through the mating member installed in the mounting groove. The mounting groove is adapted to limit the X and Y directions of the mating member and enable the mating member to have a preset moving space in the Z direction.

[0020] The energy storage battery pack according to the embodiment of the first aspect of the present application, wherein the energy storage battery pack further includes a housing assembly, the housing assembly is adapted to protect the liquid cooling plate structure, the battery module and the radiator structure, and the housing assembly is provided with a connector assembly, a battery explosion-proof assembly, a maintenance assembly, a communication interface, a fire protection assembly and an inlet and outlet assembly. The connector assembly is used to connect adjacent battery modules to each other, the battery explosion-proof assembly is adapted to relieve pressure of the battery module heat, the maintenance assembly is used to maintain the battery module, the communication interface is adapted to communicate and transmit the information of the integrated busbar assembly, the fire protection assembly is adapted to allow the fire extinguishing gas to enter the battery module, and the inlet and outlet assembly is adapted to communicate with the liquid cooling plate structure.

[0021] The energy storage system according to the embodiment of the second aspect of the present application includes: the energy storage battery pack according to the embodiment of the first aspect of the present application.

[0022] It is not difficult to understand that the energy storage system in the embodiment of the second aspect of the present application has the technical effects of the energy storage battery pack in the embodiment of the first aspect as described above, and thus will not be elaborated herein.

[0023] The additional aspects and advantages of the present application will be partially given in the following description, partially become apparent from the following description, or be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present application will be further described below in conjunction with the drawings and embodiments;

[0025] Figure 1 It is a schematic structural diagram of an embodiment of the present application;

[0026] Figure 2 Schematic diagram of the interior in the embodiment of the present application;

[0027] Figure 3 Schematic diagram of the battery module structure in the embodiment of the present application;

[0028] Figure 4 Schematic diagram of the end plate from the first perspective in the embodiment of the present application;

[0029] Figure 5 Schematic diagram of the end plate from the second perspective in the embodiment of the present application;

[0030] Figure 6 Schematic diagram of the upper cover in the embodiment of the present application;

[0031] Figure 7 Schematic diagram of the lower cover in the embodiment of the present application;

[0032] Figure 8 Schematic diagram of the integrated busbar assembly in the embodiment of the present application.

[0033] Reference numerals:

[0034] 100, liquid cooling plate structure;

[0035] 200, battery module; 210, battery cell; 211, high-temperature heat insulation material; 220, insulating plate;

[0036] 300, radiator structure; 310, plate body; 311, heat sink; 312, external fin; 320, heat dissipation component; 321, screw; 330, end plate; 331, flexible cushion layer; 332, first hole; 333, second hole; 3341, U-shaped hole; 3342, limiting part; 335, third hole;

[0037] 400, integrated busbar assembly; 401, blister PC; 402, total positive and total negative aluminum plate; 403, first busbar aluminum plate; 404, second busbar aluminum plate; 405, nickel sheet; 406, total positive and total negative copper plate; 410, fitting;

[0038] 500, fixing seat; 501, upper cover; 502, lower cover; 503, mica cover plate; 504, rivet; 510, buckle part; 520, guiding part; 530, installation groove;

[0039] 600. Housing assembly; 601. Middle housing; 602. Upper housing; 610. Connector assembly; 611. Main positive connector socket; 612. Main positive connector plug; 613. Main negative connector socket; 614. Main negative connector plug; 620. Battery explosion-proof assembly; 630. Maintenance assembly; 631. Manual maintenance switch; 632. Maintenance cover plate; 640. Communication interface; 650. Fire protection assembly; 660. Inlet and outlet nozzles of the liquid cooling plate. Detailed implementation manners

[0040] The embodiments of the present application will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application and should not be construed as a limitation to the present application.

[0041] In the description of the present application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application.

[0042] In the description of the present application, the meaning of several is one or more, and the meaning of multiple is at least two. Understandings such as greater than, less than, exceeding, etc. do not include the present number, and understandings such as above, below, within, etc. include the present number. If there is a description of first and second, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0043] In the description of the present application, unless otherwise clearly defined, words such as setting, installing, connecting, etc. should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above words in the present application after combining with the specific content of the technical solution.

[0044] Referring to Figures 1 to 8 , the energy storage battery pack according to the first aspect embodiment of the present application is applied to an energy storage system. The energy storage battery pack includes a liquid cooling plate structure 100, at least one battery module 200, and a radiator structure 300.

[0045] The battery module 200 is arranged on the liquid cooling plate structure 100, and the battery module 200 includes a plurality of battery cells 210 connected in series and arranged in sequence; the radiator structure 300 is arranged on at least one side of the battery module 200, and the radiator structure 300 includes a plate body 310 and a heat dissipation assembly 320, and a plurality of heat dissipation fins 311 are arranged at intervals on one side surface of the plate body 310, and the heat dissipation assembly 320 is arranged on the other side surface of the plate body 310 opposite to the heat dissipation fins 311, wherein each heat dissipation fin 311 is respectively inserted between each adjacent battery cell 210 and contacts with the battery cells 210 on both sides. It can be understood that the heat dissipation of the battery pack is improved by combining the liquid cooling of the bottom liquid cooling plate structure and the air cooling of the side radiator structure 300, which significantly reduces the temperature difference between the top and bottom of the battery cell 210 in the battery module 200, improves the temperature uniformity between the battery cells 210, and extends the life of the battery module 200. At the same time, the battery module 200 is relatively easy to implement in terms of process by combining air cooling with liquid cooling, and the overall cost is low, so high-rate charging and discharging can be achieved in a low-cost manner.

[0046] In some embodiments of the present application, the liquid cooling plate structure 100 is connected to the battery module 200 through a thermally conductive structural adhesive; it is understandable that contact through a thermally conductive structural adhesive can improve the heat dissipation effect, is relatively easy to implement in terms of process, and has a low overall cost. In some embodiments, the thermally conductive structural adhesive is used for bonding and heat conduction, and the thermal conductivity of the thermally conductive structural adhesive is 1.2W / mK, so that the liquid cooling plate structure at the bottom can cool the battery cell 210 by circulating the coolant.

[0047] In some embodiments of the present application, the heat sink 311 is in contact with the battery cell 210 through a thermally conductive structural adhesive or a thermally conductive pad. It is understandable that contact through a thermally conductive structural adhesive can improve the heat dissipation effect, is relatively easy to implement in terms of process, and has a low overall cost. In some embodiments of the present application, an external fin 312 is provided on the other side of the plate body 310 opposite to the heat sink 311, and the heat dissipation assembly 320 is suitable for cooling the external fin 312. It is understandable that the heat dissipation effect can be further improved by the external fin 312, so that heat is generated from the battery cell 210, and is transferred through the heat sink 311, the plate body 310 and the external fin 312, and the heat is blown away by the heat dissipation assembly 320.

[0048] In some embodiments, the heat generated inside the battery cell 210 is conducted through a thermally conductive structural adhesive or a silicone pad to the fins inside the radiator structure 300. Since the radiator structure 300 is made of aluminum, the thermal conductivity of aluminum is high, reaching 200 W / mK, which can conduct the heat generated by the battery cell 210 to the aluminum radiator. The heat dissipation component 320 includes a fan. In some embodiments, the size of the fan is 120x120x25 mm, and it is fixed to the radiator structure 300 by screws 321. When the heat of the battery cell 210 is transferred to the radiator structure 300, the external fins 312 of the radiator structure 300 blow away the heat through the fan, and at the same time, the heat can also be exchanged with the air through the flow channels formed by the fins for cooling.

[0049] In some embodiments of the present application, the battery module 200 further includes an integrated busbar assembly 400 and a fixing seat 500. The battery cells 210 are arranged in at least two columns in sequence, and adjacent columns of battery cells 210 are connected in series through the integrated busbar assembly 400. The integrated busbar assembly 400 is arranged on the fixing seat 500 and is adapted to collect information of the battery cells 210. It can be understood that the integrated busbar assembly 400 is used to connect adjacent two columns of battery cells 210 in series, and the fixing seat 500 is used to fix and support the battery module 200 and the integrated busbar assembly 400, which not only facilitates installation but also ensures the connection quality.

[0050] In some embodiments, the battery cell 210 sampling and temperature sampling on the integrated busbar assembly 400 can adopt a wiring harness solution. In the wiring harness solution, the battery cell 210 and temperature sampling can be welded to the busbar aluminum plate by nickel sheets 405 through laser welding. The integrated busbar assembly 400 is mainly composed of a plastic PC 401, a positive and negative main aluminum plate 402, and a first busbar aluminum plate 403, which are fixed on the plastic PC 401 through a thermal riveting process. The battery cell 210 sampling and temperature sampling on the wiring harness can be integrated into one through a rigid circuit board PCB. The temperature resistor is attached to the rigid PCB board, and then the nickel sheet 405 is welded to the rigid PCB board. The temperature and voltage sampling are integrated on the nickel sheet 405 sampling, and the other end is welded to the second busbar aluminum plate 404 and the first busbar aluminum plate 403 by nickel sheets 405 through laser welding. The positive and negative main aluminum bars and the positive and negative main copper bars 406 are formed into a whole through ultrasonic welding or polymer diffusion welding. A pressure relief hole for the battery cell 210 is reserved in the middle of the entire integrated busbar assembly 400. After the pressure relief valve of the battery cell 210 is opened, the pressure is released in a specific direction, and at the same time, the influence of the ejected substances during thermal runaway and the flame on other adjacent battery cells 210 is avoided.

[0051] In some embodiments, the battery pack mainly consists of two 26S1P battery modules 200 connected in series through a series copper bar to form a 52S1P battery pack, which is placed on the liquid cooling plate structure as a whole. The liquid cooling plate structure is directly bonded and thermally conductive to the battery module 200 through a thermally conductive structural adhesive.

[0052] In some embodiments of the present application, the radiator structure 300 further includes end plates 330. Each end plate 330 is disposed on the fixed seat 500 and is located at both ends of the battery module 200 in the length direction. Each end plate 330 and each plate body 310 are adapted to fixedly secure each battery cell 210 in cooperation. In some embodiments of the present application, an insulating plate 220 is provided between the end plate 330 and the battery cell 210, and a flexible cushion layer 331 is provided on the inner side of the end plate 330. It can be understood that the end plate 330 is used to ensure the overall structural stability of the battery module 200, the insulating plate 220 is used to ensure the use safety, and the flexible cushion layer 331 plays a buffering role and can also absorb tolerances. In some embodiments, the insulating plate 220 includes insulating PC, and the flexible cushion layer 331 includes foam.

[0053] In some embodiments, the radiator structure 300 is disposed on both sides of the battery module 200. The battery module 200 mainly consists of 26 square battery cells 210 to form a 26S1P module. In some embodiments, the 26 battery cells 210 are in contact with the heat sink fins 311 inside the radiator structure 300 through a thermally conductive structural adhesive or a thermally conductive silicone sheet. The two end battery cells 210 are bonded to the insulating PC through 3M adhesive. The insulating PC is combined with the end plate 330 through three foams. The two sides of the foam are back-adhered with 3M adhesive, which can bond the insulating PC and the end plate 330. The foam can play a buffering and tolerance-absorbing role. The two side-by-side battery cells 210 are adhesively isolated by a high-temperature and heat-insulating material of the battery cell 210. The end plate 330 and the plate body 310 are welded together by laser welding to fixedly secure the battery cells 210 as a whole, preventing the structural damage caused by the later expansion force of the battery cells 210. The entire battery cell module is connected in series and parallel through the integrated busbar assembly 400. The copper plates in the integrated busbar assembly 400 are fixed to the external copper plates through the fixed seat 500. The fixed seat 500 is provided with two T-shaped nuts to form an installation groove 530. The external copper plates and the total positive or total negative copper plates of the integrated busbar assembly 400 are locked to the fixed seat 500 through a fitting 410 such as a bolt, and are protected by the upper cover 501 to prevent accidental human touch and increase insulation protection. The entire integrated busbar assembly 400 is protected and insulated by a mica cover plate, and is fixed by plastic rivets being snapped into the boss holes of the integrated busbar assembly 400.

[0054] In some embodiments of the present application, the end plate 330 is provided with a first hole 332 for guiding the wire harness of the integrated busbar assembly 400, so that the wire harness of the integrated busbar assembly 400 is adapted to extend along a preset trajectory. In some embodiments of the present application, the end plate 330 is provided with an installation structure for stacking. It can be understood that machining the corresponding structure on the end plate 330 can make the details of the battery pack structure more refined and the layout more reasonable.

[0055] In some embodiments of the present application, a buckle member 510 and a guiding member 520 are provided on the fixing base 500, and a second hole 333 is provided on the end plate 330. The fixing base 500 is buckled and connected to the end plate 330 by installing the buckle member 510 in the second hole 333, and the guiding member 520 is adapted to guide the installation of the buckle member 510. It can be understood that the buckling connection method is not only convenient for installation, but also convenient for subsequent maintenance and repair.

[0056] In some embodiments, the design of the end plate 330 mainly adopts a compatibility design. The end plate 330 is designed with 4 buckle grooves, and 2 fixing bases 500 can be installed to form a 52S1P module. The first hole 332 of the end plate 330 includes 2 round holes, which are mainly used to fix the front-end wire harness of the integrated busbar assembly 400, facilitating the wire harness to be inserted into the BMU along a specific trajectory. The second hole 333 of the end plate 330 includes 4 waist-shaped holes, which are mainly used to fix the plastic fixing base 500. The third hole 335 of the end plate 330 includes 3 round holes, which are mainly used to fix the insulating plate 220. The installation structure includes U-shaped holes 3341 and a limiting portion 3342. The two U-shaped holes 3341 are mainly used for module stacking and hoisting, and the limiting portion 3342 is mainly used to limit the position of the steel strip when stacking and installing the steel strip.

[0057] In some embodiments of the present application, an installation groove 530 is provided on the fixing base 500, and a fitting 410 is provided on the integrated busbar assembly 400. The integrated busbar assembly 400 is connected to the fixing base 500 by installing the fitting 410 in the installation groove 530. The installation groove 530 is adapted to limit the X and Y directions of the fitting 410 and enable the fitting 410 to have a preset moving space in the Z direction. It can be understood that the role of having a preset moving space in the Z direction is to absorb tolerances, ensure accurate installation by workers, and reduce the problem of increased internal resistance caused by contact.

[0058] It can be understood that through the interference fit between the fitting 410 and the installation groove 530, and by using the installation groove 530 to limit the movement of the fitting 410 in the length direction and the width direction of the installation groove 530 relative to the installation groove 530, it can be ensured that the positive and negative electrodes are locked to the fitting 410 by bolts. And since the movement of the fitting 410 in the height direction relative to the installation groove 530 is not completely restricted, the fitting 410 has a certain moving space in the height direction to absorb the tolerances in the height direction of the installation groove 530 and the positive and negative electrodes when installing the positive and negative electrodes, reduce the stress on the positive and negative electrodes, prevent the positive and negative electrodes from deforming under the action of pressure, and avoid the problem of increased contact internal resistance.

[0059] In some embodiments, the main function of the fixing base 500 is to fix the positive and negative output copper plates. It mainly includes two M6 T-shaped nuts, into which two M6 T-shaped nuts can be placed. This feature restricts the X and Y directions of the nuts, ensuring that the bolt installation can be tightened. The Z direction is not restricted, which can absorb tolerances and reduce the stress of the copper plate. The fixing base 500 includes an upper cover 501 and a lower cover 502. To ensure the smooth closing of the upper and lower covers 502, an anti-fooling design is carried out for the connection of the positive and negative copper plates and the connector copper plates, making the lengths of some features inconsistent, which can ensure accurate installation by workers. If the installation is reversed, it cannot be installed. This design has an anti-fooling effect. The main function of the upper cover 501 of the plastic fixing base 500 is to prevent personnel from accidentally touching it and other metal objects from touching it, and at the same time increase its insulation.

[0060] In some embodiments of the present application, the energy storage battery pack further includes a housing assembly 600. The housing assembly 600 is adapted to protect the liquid cooling plate structure 100, the battery module 200, and the radiator structure 300. A connector assembly 610, a battery explosion-proof assembly 620, a maintenance assembly 630, a communication interface 640, a fire protection assembly 650, and an inlet and outlet assembly are provided on the housing assembly 600. The connector assembly 610 is used to connect adjacent battery modules 200 to each other. The battery explosion-proof assembly 620 is adapted to relieve pressure on the heat of the battery module 200. The maintenance assembly 630 is used to maintain the battery module 200. The communication interface 640 is adapted to communicate and transmit the information of the integrated busbar assembly 400. The fire protection assembly 650 is adapted to allow the fire extinguishing gas to enter the battery module 200. The inlet and outlet assembly is adapted to communicate with the liquid cooling plate structure 100. In some embodiments, the connector assembly 610 includes a total positive connector socket 611, a total positive connector plug 612, a total negative connector socket 613, and a total negative connector plug 614. The battery explosion-proof assembly 620 includes a battery pack explosion-proof valve. The maintenance assembly 630 includes a manual maintenance switch 631 and a maintenance cover plate 632. The communication interface 640 includes a BMU communication interface 640. The fire protection assembly 650 includes a fire nozzle. The inlet and outlet assembly includes a liquid cooling plate inlet and outlet water nozzle 660. The housing assembly 600 includes a middle shell 601 and an upper shell 602. It can be understood that the series connection of two battery packs is realized through the total positive connector socket 611, the total positive connector plug 612, the total negative connector socket 613, and the total negative connector plug 614. The battery pack explosion-proof valve relieves pressure under the condition of thermal runaway of the internal battery cell 210. The manual maintenance switch 631 can directly disconnect the internal battery power circuit. A fuse and a BMU are provided behind the maintenance cover plate 632. The maintenance cover plate 632 is mainly opened for maintenance to prevent damage to the fuse and the BMU caused by accidental situations, which can avoid overall disassembly of the battery pack and enable simpler and faster maintenance and replacement. The BMU communication interface 640 communicates and transmits the voltage and temperature data of the battery cell 210 collected by the BMU to the BMS. When the internal battery cell 210 is in a thermal runaway condition, external fire extinguishing gas is sprayed and enters the battery pack through the fire nozzle to ensure that the thermal runaway of the battery pack does not spread. The liquid cooling plate inlet and outlet water nozzle 660 is connected to a liquid cooling unit, and the battery cell 210 is cooled at the bottom by circulating the coolant. The middle shell 601 is mainly used to install components such as positive and negative connectors and the communication interface 640, and has the function of protecting the internal module. The upper shell 602 and the middle shell 601 together provide external protection for the internal battery cell 210 module.

[0061] In some embodiments, the upper shell 602 and the middle shell 601 are made of cold-rolled sheet SPCC and are processed by powder spraying. They can withstand a 1000-hour neutral salt spray test. The middle shell 601 is structured with a bottom liquid cooling plate. The upper shell 602 and the middle shell 601 are directly pressed and sealed with a foamed silica gel pad. The maintenance cover plate 632 and the middle shell 601 are also pressed and sealed with a foamed silica gel pad, ensuring that the battery pack achieves an IP67 protection level overall.

[0062] Referring to Figures 1 to 8 , the energy storage system according to the embodiments of the second aspect of the present application includes the energy storage battery pack according to the embodiments of the first aspect of the present application. This battery pack uses a combination of bottom liquid cooling and side air cooling to dissipate heat from the battery pack, improving the overall heat dissipation effect of the battery pack, significantly reducing the temperature difference between the top and bottom of the battery cells 210 of the battery pack, improving the temperature uniformity among the battery cells 210, which is beneficial to extending the life of the battery pack. At the same time, the combination of air cooling and liquid cooling in this battery pack is relatively easy to implement in terms of technology, and the overall cost is low. It can achieve high-rate charging and discharging of the battery pack in a low-cost manner.

[0063] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as within the scope described in this specification.

[0064] The embodiments of the present application have been described in detail above with reference to the drawings. However, the present application is not limited to the above embodiments. Various changes can be made without departing from the gist of the present application within the knowledge scope of those of ordinary skill in the art.

Claims

1. An energy storage battery pack, characterized in that: include: Liquid cooling plate structure; At least one battery module is arranged on the liquid cooling plate structure, and the battery module includes a plurality of battery cells connected in series and arranged in sequence; A heat sink structure is arranged on at least one side of the battery module, the heat sink structure comprises a plate body and a heat sink assembly, a plurality of heat sinks are arranged at intervals on one side of the plate body, the heat sink assembly is arranged on the other side of the plate body opposite to the heat sink, wherein each heat sink is arranged between each adjacent battery cell and contacts the battery cells on both sides; An external fin is provided on the other side of the plate body opposite to the heat sink, and the heat dissipation assembly is suitable for cooling the external fin; The battery module further includes an integrated busbar assembly and a fixing seat, the battery cells are sequentially arranged in at least two rows, the battery cells in adjacent rows are connected in series through the integrated busbar assembly, and the integrated busbar assembly is arranged on the fixing seat and is suitable for collecting information of the battery cells; The radiator structure further includes end plates, each of which is disposed on the fixing seat and is respectively located at two ends of the length direction of the battery module, and each of the end plates and each of the plate bodies are suitable for mutually cooperating to fix each of the battery cells; A flexible cushion layer is provided on the inner side of the end plate; The fixing seat is provided with a mounting groove, the integrated busbar assembly is provided with a matching piece, the integrated busbar assembly is connected to the fixing seat by being installed in the mounting groove through the matching piece, the mounting groove is suitable for limiting the X and Y directions of the matching piece and allowing the matching piece to have a preset activity space in the Z direction.

2. The energy storage battery pack according to claim 1, characterized in that: The liquid cooling plate structure is connected to the battery module via a heat-conducting structural adhesive.

3. The energy storage battery pack according to claim 2, characterized in that: The heat sink is in contact with the battery core via a thermally conductive structural adhesive or a thermally conductive pad.

4. The energy storage battery pack according to claim 1, characterized in that: An insulating plate is provided between the end plate and the battery core.

5. The energy storage battery pack according to claim 1, characterized in that: The fixing seat is provided with a snap-fit ​​piece and a guide piece, the end plate is provided with a second hole, the fixing seat is installed in the second hole through the snap-fit ​​piece and is snap-connected with the end plate, and the guide piece is suitable for guiding the installation of the snap-fit ​​piece.

6. The energy storage battery pack according to claim 1, characterized in that: The end plate is provided with a first hole for guiding the wiring harness of the integrated busbar assembly, so that the wiring harness of the integrated busbar assembly is suitable for extending according to a preset trajectory.

7. The energy storage battery pack according to claim 6, characterized in that: The end plate is provided with a mounting structure for stacking.

8. The energy storage battery pack according to claim 1, characterized in that: The energy storage battery pack also includes a shell assembly, which is suitable for protecting the liquid cooling plate structure, the battery module and the radiator structure. The shell assembly is provided with a connector assembly, a battery explosion-proof assembly, a maintenance assembly, a communication interface, a fire-fighting assembly and an inlet and outlet assembly. The connector assembly is used to connect adjacent battery modules to each other, the battery explosion-proof assembly is suitable for relieving heat from the battery module, the maintenance assembly is used to maintain the battery module, the communication interface is suitable for communicating and transmitting information of the integrated busbar assembly, the fire-fighting assembly is suitable for allowing fire-extinguishing gas to enter the battery module, and the inlet and outlet assembly is suitable for communicating with the liquid cooling plate structure.

9. An energy storage system, characterized in that: include: An energy storage battery pack as claimed in any one of claims 1 to 8.

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