Liquid cooling energy storage battery pack

Abstract

The utility model provides a liquid cooling energy storage battery pack, which comprises a lower box body, the front battery cell module and the rear battery cell module are arranged above the lower box body, the front battery cell module and the rear battery cell module are adjacently arranged in the first direction, and the front battery cell module and the rear battery cell module are electrically connected; and the box cover is connected with the lower box body and is used for isolating the front battery cell module and the rear battery cell module from the outside. According to the liquid-cooled energy storage battery pack, the front battery cell module and the rear battery cell module are arranged in the single liquid-cooled energy storage battery pack, so that the number of the battery cell modules is increased, and the energy density of the liquid-cooled energy storage battery pack is improved. Meanwhile, most parts of the front battery cell module and the rear battery cell module can be commonly used, so that the types of the parts are reduced, the production efficiency of the liquid cooling energy storage battery pack is improved, and the cost is comprehensively reduced.

Description

Technical Field

[0001] This utility model relates to the field of energy storage technology, and in particular to a liquid-cooled energy storage battery pack. Background Technology

[0002] With the increasing severity of environmental pollution and the gradual depletion of traditional energy sources, the comprehensive development of new energy technologies is receiving more and more attention. In the field of electrochemical energy storage, the battery application technology of containerized energy storage battery compartments is a key technology. Energy storage battery compartments typically contain multiple energy storage battery packs.

[0003] Existing energy storage battery pack cooling methods mainly include natural heat dissipation, air cooling, and liquid cooling, with liquid cooling being the most effective. Currently, energy storage battery packs are primarily small, low-capacity, and small-sized air-cooled or liquid-cooled packs.

[0004] The small-capacity, small-size battery packs currently popular in the industry still have some drawbacks. First, a battery compartment of the same capacity requires a greater number of small-capacity energy storage battery packs, necessitating the use of more types of structural components (such as chassis), more types of functional devices (such as power output terminals, fuses, etc.), and fire-fighting devices. Second, a battery compartment of the same capacity requires more processing time for small-capacity energy storage battery packs, meaning that the production capacity of small-capacity battery packs is lower in the same amount of time. Utility Model Content

[0005] This utility model aims to solve, at least to a certain extent, one of the technical problems in the related art.

[0006] Therefore, the purpose of this utility model is to propose a liquid-cooled energy storage battery pack, which improves the energy density of the battery pack, reduces the number of structural components and parts, improves the production efficiency of the battery pack, and comprehensively reduces costs.

[0007] To achieve the above objectives, this utility model proposes a liquid-cooled energy storage battery pack, comprising:

[0008] lower box;

[0009] A front battery cell module and a rear battery cell module are disposed above the lower housing. The front battery cell module and the rear battery cell module are arranged adjacent to each other along a first direction and are electrically connected.

[0010] The cover is connected to the lower casing, isolating the front and rear battery cell modules from the outside world.

[0011] According to the liquid-cooled energy storage battery pack of this utility model, by setting a front cell module and a rear cell module in a single liquid-cooled energy storage battery pack, the number of cell modules is increased, thereby improving the energy density of the liquid-cooled energy storage battery pack. At the same time, most of the components of the front cell module and the rear cell module are interchangeable, reducing the types of components, improving the production efficiency of the liquid-cooled energy storage battery pack, and reducing overall costs.

[0012] In some possible implementations, the front cell module includes multiple front cell columns arranged side by side, and the rear cell module includes multiple rear cell columns arranged side by side, the front cell columns and the rear cell columns being electrically connected.

[0013] In some possible implementations, the lower housing includes a limiting mounting assembly, a liquid cooling plate, and a support frame connected sequentially from top to bottom.

[0014] In some possible implementations, the front cell array and the rear cell array each include a plurality of cells arranged along a first direction and an integrated busbar, the integrated busbar being disposed above the cells.

[0015] In some possible implementations, the integrated busbar includes an aluminum bar, a first flexible circuit board, and a blister pack. The first flexible circuit board is U-shaped, and a plurality of aluminum bars are arranged around the edge of the first flexible circuit board. The aluminum bars are connected to the blister pack.

[0016] In some possible implementations, a second flexible circuit board is also included, which is disposed below the first flexible circuit board of the front cell column and is electrically connected to the first flexible circuit board of the rear cell column.

[0017] In some possible implementations, all the cells in the front cell array and the rear cell module are connected in series.

[0018] In some possible implementations, the cells in the front cell array and the rear cell module are connected in parallel to form cell pairs, and each cell pair is connected in series.

[0019] In some possible implementations, the limiting mounting assembly includes a center beam, side beams, and multiple barrier strips, with the side beams located on both sides of the center beam and the barrier strips arranged parallel between the center beam and the side beams.

[0020] In some possible implementations, the lid is made of plastic and includes a top wall, side walls, and a flange wall. The upper end of the side wall is connected to the top wall, and the lower end of the side wall is connected to the flange wall. The lid has a plurality of first recesses and second recesses. The first recesses extend from one side wall to the opposite side wall, and the second recesses are located on the side walls.

[0021] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. Wherein:

[0023] Figure 1 This is a schematic diagram of the structure of a liquid-cooled energy storage battery pack according to an embodiment of the present invention.

[0024] Figure 2 This is an exploded structural diagram of a liquid-cooled energy storage battery pack according to an embodiment of the present invention.

[0025] Figure 3 This is a schematic diagram of the lower casing of a liquid-cooled energy storage battery pack according to an embodiment of the present invention.

[0026] Figure 4 This is a schematic diagram of the structure of the cover of a liquid-cooled energy storage battery pack according to an embodiment of this utility model.

[0027] Figure 5 This is a schematic diagram of the structure of the front and rear battery cell arrays according to an embodiment of the present invention.

[0028] Figure 6 This is an exploded structural diagram of the front and rear battery cell arrays according to an embodiment of the present invention.

[0029] Figure 7 This is an exploded structural diagram of an embodiment of the present invention involving an integrated busbar.

[0030] Figure 8 This is a schematic diagram of an embodiment of the present invention relating to a series connection scheme of internal cells in a liquid-cooled energy storage battery pack.

[0031] Figure 9 This is a schematic diagram of an embodiment of the present invention relating to a parallel connection scheme of internal cells in a liquid-cooled energy storage battery pack.

[0032] Explanation of reference numerals in the attached figures:

[0033] 10-Lower housing, 11-Liquid cooling plate, 12-Barrier strip, 13-Side beam, 14-Middle beam, 15-Support frame, 16-Placement area, 20-BMU integrated module, 30-Front cell module, 31-Front cell row, 40-Panel integrated module, 50-Cover, 51-First recess, 52-Second recess, 60-Explosion-proof valve, 70-Rear cell module, 71-Rear cell row, 311-Cell, 312-Integrated busbar, 313-Cell strap, 3121-Aluminum busbar, 3122-First flexible circuit board, 3123-Blaster, 3124-Second flexible circuit board. Detailed Implementation

[0034] The embodiments of this utility model are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model. Rather, the embodiments of this utility model include all variations, modifications, and equivalents falling within the spirit and scope of the appended claims.

[0035] The following is for reference. Figures 1 to 9 This describes a liquid-cooled energy storage battery pack according to an embodiment of the present invention.

[0036] Combination Figure 1 and Figure 2 As shown, the liquid-cooled energy storage battery pack provided in this embodiment of the present invention includes a lower housing 10, a front cell module 30, a rear cell module 70, and a housing cover 50.

[0037] The lower housing 10 serves to support and cool the battery cell modules. The lower housing 10 possesses high mechanical strength, meeting the requirements for lifting, transferring, supporting, transporting, and rail-mounting heavy, high-capacity battery packs. The specific type of the lower housing 10 is determined based on actual needs and is not limited thereto. For example, the lower housing 10 can be approximately rectangular. The upper surface area of ​​the lower housing 10 is larger than the sum of the bottom areas of all the battery cell modules, which helps to distribute the heat generated by the battery cell modules more evenly across the entire surface of the lower housing, preventing localized overheating.

[0038] The front battery module 30 and the rear battery module 70 are located above the lower housing 10, arranged adjacent to each other along a first direction, and electrically connected. The front battery module 30 includes multiple front battery cell rows 31 arranged side-by-side along a second direction, and the rear battery module 70 includes multiple rear battery cell rows 71 arranged side-by-side along the second direction. The front and rear battery cell rows 31 are electrically connected. The number of rows of the front and rear battery cell rows 31 is set according to actual needs and is not limited. For example, the number of rows of the front and rear battery cell rows 31 is the same, and they are arranged on the same layer. The overall structure is compact. The specific types of the first and second directions are set according to actual needs and are not limited. For example, the first direction can be the length direction of the lower housing 10, and the second direction can be the width direction of the lower housing 10.

[0039] The cover 50 is connected to the lower housing 10, isolating the front battery module 30 and the rear battery module 70 from the outside environment. The cover 50 has sufficient strength and rigidity to protect the internal battery modules from physical damage. The cover 50 and the lower housing 10 can be connected by bolts, clips, or other means.

[0040] According to the liquid-cooled energy storage battery pack of this utility model embodiment, by setting a front cell module and a rear cell module in a single liquid-cooled energy storage battery pack, the number of cell modules is increased, thereby improving the energy density of the liquid-cooled energy storage battery pack. At the same time, most components of the front cell module and the rear cell module are interchangeable, reducing the types of components, improving the production efficiency of the liquid-cooled energy storage battery pack, and comprehensively reducing costs.

[0041] Combination Figure 2 and Figure 3 As shown, in some embodiments, the front cell array 31 and the rear cell array 71 each include a plurality of cells 311 arranged along a first direction and an integrated busbar 312, with the integrated busbar 312 positioned above the cells 311. The integrated busbar 312 serves as an electrical connection. The cells 311 are connected in series and / or parallel, configured according to actual needs. The lower housing 10 of the liquid-cooled energy storage battery pack includes a limiting mounting assembly, a liquid cooling plate 11, and a support frame 15 connected sequentially from top to bottom. The limiting mounting assembly is used to mount the front cell module 30 and the rear cell module 70, while also limiting the movement of the front cell array 31 and the rear cell array 71.

[0042] Combination Figure 3 , Figure 5 and Figure 6As shown, the limiting installation assembly includes a central beam 14, side beams 13, and multiple barrier strips 12. The side beams 13 are located on both sides of the central beam 14, and the barrier strips 12 are arranged parallel between the central beam 14 and the side beams 13. The distance from the side beams 13 to the central beam 14 is adapted to the length of the front cell module 30 or the rear cell module 70. Both ends of the front cell array 31 and the rear cell array 71 are provided with end plates, and fasteners are provided on the end plates. Each cell 311 is bundled into a cell array using cell binding straps 313. The fasteners on the end plates are detachably connected to the central beam 14 and the side beams 13. To achieve weight reduction, the central beam 14 and the side beams 13 are hollow structural components. The specific type of structural component is set according to actual needs and is not limited thereto. For example, square tubing is used as the structural component. Square tubing has higher mechanical strength than stamped sheet metal structural components, meeting the strength requirements for support, bending resistance, and vibration resistance required for the large self-weight of large-capacity battery packs. The central beam 14 connects the rear end of the front cell array 31 and the front end of the rear cell array 71, achieving a compact design. The barrier strip 12, the central beam 14, and the side beams 13 divide the upper surface of the liquid cooling plate 11 into multiple placement areas 16, which are coated with thermally conductive adhesive for bonding the cell modules.

[0043] The liquid cooling plate 11 contains cooling channels, and the external circulating coolant evenly dissipates heat from all the cells in the battery pack, ensuring the safe and efficient use of the cells. The liquid cooling plate 11 is manufactured using a profile welding process, which is simple to process and results in a product with good flatness. The support frame 15 adopts a frame structure and is made of hollow profiles, achieving lightweight construction.

[0044] In some embodiments, such as Figure 4 As shown, the lid 50 is made of plastic and includes a top wall, side walls, and a flange wall. The upper end of the side wall is connected to the top wall, and the lower end of the side wall is connected to the flange wall. The lid 50 has multiple first recesses 51 and second recesses 52. The first recesses 51 extend from one side wall to the opposite side wall, and the second recesses 52 are located on the side walls. The first recesses 51 and second recesses 52 form reinforcing ribs, providing stable support for the top wall and side walls. The alternating arrangement of the first recesses 51 and second recesses 52 results in an aesthetically pleasing appearance.

[0045] The specific types of the first recess 51 and the second recess 52 are set according to actual needs and are not limited thereto. For example, the middle part of the first recess 51 has a hexagonal shape to achieve stable support for the top wall in the first and second directions.

[0046] Combination Figure 1 , Figure 2As shown, the front wall of the cover 50 of the liquid-cooled energy storage battery pack is equipped with a BMU integrated module 20 (BMU, Battery Management Unit) and a panel integrated module 40. The panel integrated module 40 integrates the main positive interface, main negative interface, fire alarm interface, fuse, and communication interface of the battery pack. The rear wall of the cover 50 of the liquid-cooled energy storage battery pack is equipped with an explosion-proof valve 60. In the event of thermal runaway and rapid gas generation in the battery cells, the internal pressure of the battery pack rises rapidly. The explosion-proof valve 60 opens within a specified pressure range to release the pressure and prevent the cover 50 from expanding and exploding under pressure.

[0047] Combination Figures 5 to 7 As shown, in some embodiments, the integrated busbar 312 includes an aluminum busbar 3121, a first flexible circuit board 3122, and a blister pack 3123. The first flexible circuit board 3122 is U-shaped, and multiple aluminum busbars 3121 are arranged around the edge of the first flexible circuit board 3122. The aluminum busbars 3121 are connected to the blister pack 3123. The aluminum busbar 3121, also called a busbar, is a conductive component used to connect multiple battery cells and has good conductivity and mechanical strength. The aluminum busbar 3121 is soldered to the first flexible circuit board 3122 using nickel foil. The first flexible circuit board 3122 integrates a temperature sensor and a voltage sensor to measure the temperature and voltage of each battery cell 311. The blister pack 3123, by closely fitting the shape of the battery cell, serves to fix the first flexible circuit board 3122 and the aluminum busbar 3121 before the aluminum busbars 3121 are soldered. The aluminum busbars must be precisely positioned to ensure that the soldering of the aluminum busbars and the battery cell terminals is mutually compatible.

[0048] The liquid-cooled energy storage battery pack also includes a second flexible circuit board 3124, which is positioned below the first flexible circuit board 3122 of the front cell array 31. The second flexible circuit board 3124 is electrically connected to the first flexible circuit board 3122 of the rear cell array 71, specifically via a plug-in connection. Both the second flexible circuit board 3124 and the first flexible circuit board 3122 of the front cell array 31 are connected to the BMU integrated module 20. This approach does not create a new space requirement in terms of height, reduces the design difficulty of the acquisition circuitry in the rear cell module 70, reduces production difficulty, improves process consistency, ensures good regularity, and simplifies process operation.

[0049] In some embodiments, such as Figure 8 As shown, all cells 311 in the front cell array 31 and the rear cell module 70 are connected in series. Compared with the parallel connection scheme of the same number of cells, the series connection scheme can increase the voltage of a single battery pack, reduce the number of battery packs required for a single battery cluster, and improve assembly efficiency.

[0050] In some embodiments, such as Figure 9As shown, the cells 311 in the front cell column 31 and the rear cell module 70 are connected in parallel to form cell pairs, and each cell pair is connected in series. Compared with the series connection scheme with the same number of cells in series, the parallel connection scheme can maintain a constant voltage and increase the capacity, making it particularly suitable for long-term energy storage.

[0051] It should be noted that in the description of this utility model, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0052] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0053] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0054] In the description of this utility model, the terms "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0055] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of the preferred embodiments of the present invention includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order according to the functions involved, as should be understood by those skilled in the art to which embodiments of the present invention pertain.

[0056] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0057] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A liquid-cooled energy storage battery pack, characterized in that, include: Lower box(10); A front battery module (30) and a rear battery module (70) are disposed above the lower housing (10). The front battery module (30) and the rear battery module (70) are arranged adjacent to each other along a first direction and are electrically connected. The cover (50) is connected to the lower box (10) to isolate the front battery module (30) and the rear battery module (70) from the outside world.

2. The liquid-cooled energy storage battery pack according to claim 1, characterized in that, The front cell module (30) includes multiple front cell columns (31) arranged side by side, and the rear cell module (70) includes multiple rear cell columns (71) arranged side by side. The front cell columns (31) and the rear cell columns (71) are electrically connected.

3. The liquid-cooled energy storage battery pack according to claim 2, characterized in that, The lower housing (10) includes a limiting installation assembly, a liquid cooling plate (11), and a support frame (15) connected together from top to bottom.

4. The liquid-cooled energy storage battery pack according to claim 2, characterized in that, The front cell array (31) and the rear cell array (71) each include a plurality of cells (311) arranged along a first direction and an integrated busbar (312), the integrated busbar (312) being disposed above the cells (311).

5. The liquid-cooled energy storage battery pack according to claim 4, characterized in that, The integrated busbar (312) includes an aluminum busbar (3121), a first flexible circuit board (3122), and a blister pack (3123). The first flexible circuit board (3122) is U-shaped, and multiple aluminum busbars (3121) are arranged around the edge of the first flexible circuit board (3122). The aluminum busbars (3121) are connected to the blister pack (3123).

6. The liquid-cooled energy storage battery pack according to claim 5, characterized in that, It also includes a second flexible circuit board (3124), which is disposed below the first flexible circuit board (3122) of the front cell column (31), and the second flexible circuit board (3124) is electrically connected to the first flexible circuit board (3122) of the rear cell column (71).

7. The liquid-cooled energy storage battery pack according to claim 4, characterized in that, All the cells (311) in the front cell array (31) and the rear cell module (70) are connected in series.

8. The liquid-cooled energy storage battery pack according to claim 4, characterized in that, The cells (311) in the front cell array (31) and the rear cell module (70) are connected in parallel to form cell pairs, and each cell pair is connected in series.

9. The liquid-cooled energy storage battery pack according to claim 3, characterized in that, The limiting installation assembly includes a central beam (14), side beams (13) and multiple barrier strips (12). The side beams (13) are located on both sides of the central beam (14), and the barrier strips (12) are arranged parallel between the central beam (14) and the side beams (13).

10. The liquid-cooled energy storage battery pack according to claim 1, characterized in that, The lid (50) is made of plastic. The lid (50) includes a top wall, a side wall and a flange wall. The upper end of the side wall is connected to the top wall and the lower end of the side wall is connected to the flange wall. The lid (50) is provided with a plurality of first recesses (51) and second recesses (52). The first recesses (51) extend from one side wall to the opposite side wall, and the second recesses (52) are provided on the side wall.

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