Energy storage liquid cooling battery module

Abstract

The utility model discloses an energy storage liquid cooling battery module which comprises a liquid cooling plate, an upper cover, eight welding modules, a positive electrode output port, a negative electrode output port, a fire joint, an explosion-proof valve and an MSD, each welding module comprises thirteen battery cells arranged side by side and an integrated busbar; the thirteen battery cells are bonded through back glue of aerogel, the outer sides of the battery cells at the head end and the tail end are respectively provided with an end plate, and the end plates and the peripheries of all the battery cells are extruded and fixed together through a steel belt; the top of each battery cell is provided with positive and negative battery cell pole columns, the battery cell pole columns of the thirteen battery cells are welded with an aluminum row on the integrated busbar, the negative battery cell pole column of one battery cell is connected with the positive battery cell pole column of the next battery cell through the aluminum row, and all the battery cells are connected in series to form a parallel-series welding module; and the eight welding modules are sequentially connected in series through aluminum bars to form a parallel-series module. The utility model has the advantages of large number of battery cells, small occupied space of other parts and high energy density.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply equipment, and particularly relates to an energy storage liquid-cooled battery module with a new architecture. Background Art

[0002] With the growth of power consumption demands in various aspects, in order to solve problems such as seasonal power consumption of the power grid, storage of solar energy and wind energy, etc., an energy storage power supply system is mostly adopted nowadays. For the convenience of transportation, sometimes the power supply system needs to be made into the standard container size.

[0003] In the existing energy storage liquid-cooled battery modules, sometimes the same-capacity battery cells from different manufacturers are used. There is a difference of 1-2 mm in the sizes of the battery cells from each manufacturer. When designing the same module, when the output aluminum bar is connected to the fixed output insulating block, if the output insulating block pushes up the aluminum bar, it will cause a gap to occur during the welding of the aluminum bar and the battery cell terminal post, resulting in a virtual weld. If there is a gap between the output insulating block and the aluminum bar, after the terminal post welding is completed, when the output aluminum bar is connected to the copper bar through the output insulating block, the aluminum bar will bend downward, and stress will be generated at the terminal post welding position. Nowadays, most liquid-cooled modules use plastic shells. Although they are flame-retardant materials, they cannot control the thermal runaway of the battery cells inside the module. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the deficiencies of the prior art and provide an energy storage liquid-cooled battery module with a large number of battery cells, small occupied space of other parts, and high energy density.

[0005] The purpose of the utility model is achieved through the following technical solutions: An energy storage liquid-cooled battery module includes a liquid-cooled plate, an upper cover, eight welding modules, a positive output port, a negative output port, a fire-fighting joint, an explosion-proof valve, and an MSD;

[0006] The welding modules are fixed on the liquid-cooled plate by screws and covered by the upper cover; each welding module includes thirteen battery cells arranged side by side and an integrated bus bar; the thirteen battery cells are bonded together by the back glue of aerogel, and end plates are respectively arranged outside the battery cells at both the head and the tail ends. The end plates and the periphery of all the battery cells are fixed by extrusion with a steel belt; positive and negative battery cell terminal posts are arranged at the top of each battery cell. The battery cell terminal posts of the thirteen battery cells are welded to the aluminum bar on the integrated bus bar. The negative battery cell terminal post of one battery cell is connected to the positive battery cell terminal post of the next battery cell through the aluminum bar. All the battery cells are connected in series to form a welding module of 1 parallel and 13 series, and eight welding modules are sequentially connected in series through aluminum bars to form a module of 1 parallel and 104 series; the positive output port and the negative output port serve as the positive and negative interfaces of the module for external connection;

[0007] A front panel is provided on the liquid cooling plate at the end face of the module formed by eight welding modules. Windows for installing the positive output port, negative output port, fire connection, explosion-proof valve, and MSD are provided on the upper cover. The positive output port, negative output port, fire connection, explosion-proof valve, and MSD are all fixed on the front panel. The negative output port is connected to the MSD through a copper busbar, and the MSD is then connected to the total negative of the module formed by eight welding modules through a copper busbar. The positive output port is connected to the total positive of the module formed by eight welding modules.

[0008] Output insulating blocks are provided at both ends of the integrated busbar. The output insulating blocks are placed on the end plate and can move up and down on the end plate. The output insulating blocks are fixed to the end plate by nuts.

[0009] The eight welding modules are arranged in two rows on the liquid cooling plate, with four welding modules in each row. They are arranged in a way that the negative of the previous welding module is adjacent to the positive of the next welding module. Installation strips are provided at positions corresponding to the end plates of each welding module on the liquid cooling plate, and the end plates of the welding modules are fixed to the installation strips by screws.

[0010] A battery management unit is also provided on the front panel, and an explosion-proof valve and a fire protection module are installed on the front panel.

[0011] Flow channels for the coolant to flow are provided on the liquid cooling plate. The inlet and outlet nozzles of the flow channels are respectively arranged at two diagonal corners of the liquid cooling plate. The heat generated by the battery cells is transmitted to the liquid cooling plate, and the liquid cooling plate takes out the heat through the coolant.

[0012] The beneficial effects of the present utility model are as follows:

[0013] (1) The present utility model includes components such as a liquid cooling plate, welding modules, upper cover, MSD, and BMU. Due to the large number of battery cells and the small space occupied by other parts, its energy density is high.

[0014] (2) The present utility model takes out the heat of the battery cells through the liquid cooling plate to achieve the temperature rise control and temperature difference control of the battery cells.

[0015] (3) The present utility model can provide an integrated busbar, which is connected in series by welding to achieve the voltage and temperature acquisition of the battery cells.

[0016] (4) The present utility model can provide output insulating blocks, which can move up and down through the movable installation with the end plate to ensure that there is no stress and false welding at the pole column welding place when the output aluminum busbar is fixed to the nut on the output insulating block.

[0017] (5) The end plates on both sides of the battery cell module are directly installed on the installation strips of the liquid cooling plate, and the installation is simple and fast.

[0018] (6) Aerogel is used between the battery cells, which has a low thermal conductivity and good heat insulation effect, can effectively prevent heat diffusion between the battery cells, and prevent the spread of thermal runaway; the sheet metal upper cover can ensure that the open flame during the thermal runaway of the battery cells is controlled inside the module. Description of the Drawings

[0019] Figure 1 It is the overall external view of the energy storage power module in the present utility model;

[0020] Figure 2 It is the exploded view of the energy storage power module in the present utility model;

[0021] Figure 3 It is the exploded view of the welding module of the energy storage power module in the present utility model;

[0022] Figure 4 It is the installation schematic diagram of the welding module;

[0023] Description of the reference numerals: 1 - welding module, 2 - BMU, 3 - fire protection module, 4 - explosion-proof valve, 5 - positive output port, 6 - negative output port, 7 - fire protection joint, 8 - MSD, 9 - upper cover, 10 - liquid cooling plate, 11 - front panel, 12 - installation strip, 301 - battery cell, 302 - aerogel, 303 - integrated busbar (CCS), 304 - end plate, 305 - steel strip, 306 - output insulating block. Detailed Embodiment

[0024] In order to reduce the stress of the aluminum busbar and the problem of pole column virtual soldering during installation in the present utility model, the output insulating block and the end plate are designed to be movable, which can not only ensure the installation during installation, but also make the aluminum busbar stress-free and without virtual soldering. When the battery cells are used improperly, thermal runaway will occur. The aerogel between the battery cells and the sheet metal upper cover can effectively control the thermal runaway inside the module, and its overall structure is as Figure 1 shown. The technical solution of the present utility model will be further described below with reference to the drawings.

[0025] As Figure 2 shown, an energy storage liquid-cooled battery module includes a liquid cooling plate 10, an upper cover 9, eight welding modules 1, a positive output port 5, a negative output port 6, a fire protection joint 7, an explosion-proof valve 4 and an MSD 8;

[0026] The welding module 1 is fixed on the liquid cooling plate 10 by screws and covered by the upper cover 9; each welding module 1 includes thirteen battery cells 301 arranged side by side and an integrated busbar 303, as Figure 3As shown in the figure; the thirteen battery cells are bonded together through the back glue of the aerogel 302. One end plate 304 is respectively provided on the outer sides of the battery cells at both the head and the tail. The end plate 304 and the peripheries of all the battery cells are fixed by extrusion with a steel strip 305. The aerogel 302 between the battery cells 301 has a low thermal conductivity of the aerogel and a good heat insulation effect, which can effectively isolate the heat transfer of the battery cells and prevent the spread of thermal runaway. Positive and negative battery cell terminals are provided on the top of each battery cell. The battery cell terminals of the thirteen battery cells are welded to the aluminum busbars on the integrated busbar. Through the aluminum busbars, the negative battery cell terminal of one battery cell is connected to the positive battery cell terminal of the next battery cell. All the battery cells are connected in series to form a welding module of 1 parallel and 13 series. Eight welding modules are then connected in series in sequence through aluminum busbars to form a module of 1 parallel and 104 series. The positive output port 5 and the negative output port 6 serve as the positive and negative interfaces of the module to the outside.

[0027] A front panel 11 is provided on the liquid cooling plate 10 at the end face where the eight welding modules 1 form the module. The positive output port 5, the negative output port 6, the fire fighting connector 7, the explosion-proof valve 4, and the MSD 8 are all fixed on the front panel 11. Windows for installing the positive output port 5, the negative output port 6, the fire fighting connector 7, the explosion-proof valve 4, and the MSD 8 are provided on the upper cover 9. The negative output port 6 is connected to the MSD8 through a copper busbar, and the MSD8 is then connected to the total negative pole of the module formed by the eight welding modules 1 through a copper busbar. The positive output port 5 is connected to the total positive of the module formed by the eight welding modules 1.

[0028] Output insulating blocks 306 are respectively provided at both ends of the integrated busbar 303. The output insulating blocks 306 are placed on the end plate 304. The output insulating blocks 306 can move up and down on the end plate 304, and the output insulating blocks 306 are fixed to the end plate 304 through nuts.

[0029] The eight welding modules 1 are arranged in two rows on the liquid cooling plate 10, with four welding modules in each row. They are arranged in a way that the negative pole of the previous welding module is adjacent to the positive pole of the next welding module, as Figure 4 shown in the figure. Installation strips 12 are provided at positions on the liquid cooling plate 10 corresponding to the end plates of each welding module. The end plate 304 of the welding module 1 is fixed to the installation strip 12 through screws.

[0030] A battery management unit (BMU) 2 is also provided on the front panel 11 to monitor data such as the voltage and temperature of the battery cells. The welding modules are arranged in two rows. In this embodiment, two BMUs are provided to monitor the voltage, temperature, and other data of the two rows of welding modules respectively. The connection lines between the BMUs and the welding modules are arranged on the integrated busbar 303.

[0031] An explosion-proof valve 4 and a fire protection module 3 are also installed on the front panel 11. Windows for installing the explosion-proof valve 4 and the fire protection module 3 are provided on the upper cover 9. When the battery cells undergo thermal runaway, the fire protection module 3 outputs an alarm through a fire protection connector 7. The fire protection module 3 is an independent thermally-activated fire protection device. The explosion-proof valve 4 can reduce the air pressure increased due to the internal temperature rise.

[0032] Flow channels for the coolant to flow through are provided on the liquid cooling plate 10. The water inlet and outlet nozzles of the flow channels are respectively arranged at two diagonal corners of the liquid cooling plate 10. The heat generated by the battery cells is transferred to the liquid cooling plate 10, and the liquid cooling plate 10 takes out the heat through the coolant. The upper cover 9 is fixedly sealed with the liquid cooling plate 10.

[0033] Those of ordinary skill in the art will realize that the embodiments described herein are for helping readers understand the principles of the present invention, and it should be understood that the protection scope of the present invention is not limited to such specific statements and embodiments. Those of ordinary skill in the art can make various other specific deformations and combinations without departing from the essence of the present invention based on the technical revelations disclosed in the present invention, and these deformations and combinations are still within the protection scope of the present invention.

Claims

1. An energy storage liquid-cooled battery module, characterized in that: It includes a liquid cooling plate (10), an upper cover (9), eight welding modules (1), a positive output port (5), a negative output port (6), a fire-fighting joint (7), an explosion-proof valve (4) and an MSD (8); The welding module (1) is fixed to the liquid cooling plate (10) by screws and sealed by an upper cover (9); each welding module (1) comprises thirteen battery cells (301) arranged side by side and an integrated busbar (303); the thirteen battery cells are bonded to each other by means of the adhesive backing of the aerogel (302); an end plate (304) is respectively arranged on the outer side of the battery cells at both ends; the end plate (304) and the outer periphery of all the battery cells are squeezed and fixed by means of a steel belt (305); positive and negative battery cell poles are arranged on the top of each battery cell; the battery cell poles of the thirteen battery cells are welded to the aluminum bar on the integrated busbar; the negative battery cell pole of one battery cell is connected to the positive battery cell pole of the next battery cell by means of the aluminum bar; all the battery cells are connected in series to form a 1-in-13-in-1 welding module; and eight welding modules are connected in series in sequence by means of the aluminum bar to form a 1-in-104-in-1 module; the positive output port (5) and the negative output port (6) serve as the positive and negative electrode interfaces of the module to the outside; A front panel (11) is provided on the liquid cooling plate (10) of the end surface of the module formed by the eight welding modules (1), and a window for installing a positive output port (5), a negative output port (6), a fire connector (7), an explosion-proof valve (4), and an MSD (8) is provided on the upper cover (9); the positive output port (5), the negative output port (6), the fire connector (7), the explosion-proof valve (4), and the MSD (8) are all fixed on the front panel (11); the negative output port (6) is connected to the MSD (8) through a copper busbar, and the MSD (8) is connected to the eight welding modules (1) through the copper busbar to form a total negative connection of the module; the positive output port (5) and the eight welding modules (1) form a total positive connection of the module; Output insulating blocks (306) are respectively provided at both ends of the integrated busbar (303). The output insulating blocks (306) are placed on the end plates (304). The output insulating blocks (306) can move up and down on the end plates (304). The output insulating blocks (306) are fixed to the end plates (304) by nuts.

2. The energy storage liquid-cooled battery module according to claim 1, characterized in that: The eight welding modules (1) are arranged in two rows on the liquid cooling plate (10), with four welding modules in each row; the modules are arranged in such a way that the negative pole of the previous welding module is adjacent to the positive pole of the next welding module; a mounting bar (12) is provided at a position on the liquid cooling plate (10) corresponding to the end plate of each welding module, and the end plate (304) of the welding module (1) is fixed to the mounting bar (12) by screws.

3. The energy storage liquid-cooled battery module according to claim 1, characterized in that: A battery management unit (2) is also provided on the front panel (11).

4. The energy storage liquid-cooled battery module according to claim 1, characterized in that: The front panel (11) is equipped with an explosion-proof valve (4) and a fire-fighting module (3).

5. The energy storage liquid-cooled battery module according to claim 1, characterized in that: A flow channel for the flow of cooling liquid is provided on the liquid cooling plate (10), and the inlet and outlet nozzles of the flow channel are respectively arranged at two diagonal positions of the liquid cooling plate (10); the heat generated by the battery core is transmitted to the liquid cooling plate (10), and the liquid cooling plate (10) removes the heat through the cooling liquid.

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