Energy storage liquid cooling battery pack

Abstract

The utility model relates to the technical field of energy storage devices, and provides an energy storage liquid-cooled battery pack which comprises a bottom shell, the bottom shell is provided with a containing space, a plurality of battery cells are arranged in the containing space at intervals, a margin gap is formed between every two adjacent battery cells, a partition piece is arranged in the margin gap, and the two ends of the partition piece abut against the battery cells on the two sides respectively. And the separator is used for providing a space for expansion deformation of the battery cell. According to the technical scheme, the problem that the whole battery pack is damaged or thermal runaway spreads due to the expansion of the battery cell in the prior art is solved.

Description

Technical Field

[0001] This utility model relates to the field of energy storage device technology, specifically to an energy storage liquid-cooled battery pack. Background Art

[0002] With the large-scale application of renewable energy, battery packs have received widespread attention as important energy storage devices to achieve efficient energy storage and stable supply. However, in the process of integrating existing battery packs, the cells are installed too tightly to control the pack size, without leaving reasonable expansion gaps. Furthermore, the adhesive materials used between the cells are insufficient to absorb the increased size after expansion. The adhesive materials used in the assembly of existing battery packs also lack thermal insulation and flame retardant properties, leading to heat propagation within the pack in the event of thermal runaway. Additionally, the cooling system channels in existing battery packs, due to their reinforced structure, cannot achieve a large contact area with the cells, sometimes less than 50%, resulting in poor heat dissipation. This increases the performance requirements of the liquid cooling equipment and raises system costs. Utility Model Content

[0003] This invention proposes an energy storage liquid-cooled battery pack, which solves the problem in related technologies where cell expansion leads to damage to the entire battery pack or the spread of thermal runaway.

[0004] The technical solution of this utility model is as follows:

[0005] A liquid-cooled energy storage battery pack, comprising:

[0006] The bottom shell has a receiving space.

[0007] The battery cell, comprising several cells, is arranged at intervals within the receiving space, with a clearance between adjacent cells.

[0008] A spacer is disposed within the allowance gap, and both ends of the spacer abut against the battery cells on both sides respectively. The spacer is used to provide space for the expansion and deformation of the battery cells.

[0009] As a further technical solution, the spacer is a flexible component.

[0010] As a further technical solution, the spacer has a stop portion and a recessed portion. The stop portion is annular and located around the recessed portion. The stop portion is used to contact the battery cells on both sides.

[0011] As a further technical solution, the thickness of the concave portion is less than the width of the allowance gap.

[0012] As a further technical solution, it also includes:

[0013] A liquid-cooled base plate is disposed within the accommodating space and abuts against a plurality of the battery cells. The liquid-cooled base plate has a flow channel with a width of 3 to 10 mm.

[0014] As a further technical solution, the accommodating space has an opening and further includes:

[0015] A first cover plate and a second cover plate are disposed adjacently on the bottom shell to block the opening.

[0016] As a further technical solution, it also includes:

[0017] A fire sensor is disposed on the second cover plate, located on the side of the second cover plate away from the receiving space.

[0018] As a further technical solution, the thickness of the flexible, uncompressed portion is 2.2 mm, and the width of the allowance gap is 1.6 mm.

[0019] As a further technical solution, the thickness of the concave portion is 1.5 mm.

[0020] The working principle and beneficial effects of this utility model are as follows:

[0021] In this invention, the bottom shell of the liquid-cooled energy storage battery pack provides a receiving space, within which several battery cells are arranged at intervals, with a clearance between adjacent cells. Spacers are installed within these clearances, with their ends tightly abutting against the cells on either side. When a cell expands and deforms, the spacers provide sufficient space, preventing damage from compression and ensuring the structural stability of the battery pack. By incorporating clearances and spacers, the problem of insufficient expansion clearance due to overly tight cell installation is effectively solved, ensuring cell safety during expansion and deformation, and improving the reliability and lifespan of the battery pack. Furthermore, the spacers prevent cell failure due to compression, further enhancing the battery pack's performance. Attached Figure Description

[0022] The preferred embodiments will be described below in a clear and easy-to-understand manner, in conjunction with the accompanying drawings, to further explain the above-mentioned characteristics, technical features, advantages and implementation methods of this utility model.

[0023] Figure 1 This is a schematic diagram of the structure of this utility model;

[0024] Figure 2 This is a schematic diagram of the internal structure of this utility model;

[0025] Figure 3This is a schematic diagram of the battery cell structure in this utility model;

[0026] Figure 4 This is a schematic diagram of the liquid-cooled base plate structure in this utility model.

[0027] In the diagram: bottom shell-1, accommodating space-101, battery cell-2, margin gap-201, spacer-3, abutment-301, recess-302, liquid-cooled base plate-4, flow channel-401, opening-102, first cover plate-5, second cover plate-6, fire sensor-7. DETAILED DESCRIPTION

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0029] To keep the drawings concise, only the parts relevant to the utility model are shown schematically in each drawing; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of the components with the same structure or function is schematically shown, or only one is labeled. In this document, "a" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0030] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] Reference Figures 1-4An embodiment of this utility model proposes an energy storage liquid-cooled battery pack, including a bottom shell 1, the bottom shell 1 having a receiving space 101, a plurality of battery cells 2 arranged at intervals in the receiving space 101, a margin gap 201 formed between two adjacent battery cells 2, a spacer 3 disposed in the margin gap 201, and the two ends of the spacer 3 respectively abutting against the battery cells 2 on both sides, the spacer 3 being used to provide space for the expansion and deformation of the battery cells 2.

[0033] In this embodiment, in the energy storage liquid-cooled battery pack, the bottom shell 1 provides a receiving space 101, and several battery cells 2 are arranged at intervals within the receiving space 101, with a clearance gap 201 formed between adjacent battery cells 2. Spacers 3 are provided within these clearance gaps 201, with both ends of the spacers 3 tightly abutting against the battery cells 2 on both sides. When a battery cell 2 expands and deforms, the spacers 3 provide sufficient space to prevent damage caused by compression between battery cells 2, while also ensuring the structural stability of the battery pack. By setting the clearance gaps 201 and the spacers 3, the problem of insufficient expansion clearance due to overly tight installation of battery cells 2 is effectively solved, ensuring the safety of battery cells 2 during expansion and deformation, and improving the reliability and service life of the battery pack. Simultaneously, the spacers 3 also prevent battery cells 2 from malfunctioning due to compression, further improving the performance of the battery pack.

[0034] Furthermore, partition 3 is a flexible component.

[0035] In this embodiment, a flexible spacer 3 is provided in the clearance 201 between adjacent cells 2 in the energy storage liquid-cooled battery pack. The two ends of the flexible spacer 3 are in close contact with the cells 2 on both sides. The flexible spacer 3 is chosen because, on the one hand, it can better accommodate the expansion and deformation of the cells 2, providing them with sufficient space; on the other hand, the flexible material can reduce damage to the cells 2, further improving the safety and reliability of the battery pack. Simultaneously, the flexible spacer 3 also plays a certain buffering role, reducing the risk of damage to the cells 2 due to vibration and other factors during operation.

[0036] Furthermore, the spacer 3 has a stop portion 301 and a recessed portion 302. The stop portion 301 is annular and located around the recessed portion 302. The stop portion 301 is used to contact the battery cells 2 on both sides.

[0037] In this embodiment, the spacer 3 can be either a rigid or flexible component. The battery cells 2 are spaced apart within the bottom shell 1. The spacer 3, positioned within the clearance gap 201, has a stop portion 301 and a recessed portion 302. The stop portion 301 is annular, surrounding the recessed portion 302, and it abuts tightly against the battery cells 2 on both sides. This structural design of the spacer 3 allows the stop portion 301 to stably abut against the battery cells 2, providing support and restraint. The recessed portion 302 provides greater space for the expansion and deformation of the battery cells 2, further ensuring their safety. Simultaneously, this structure enhances the overall strength and stability of the spacer 3, improving the performance of the battery pack.

[0038] In addition to being an integral structure, the abutment 301 and the recessed portion 302 can also be configured as separate structures, consisting of an outer flame-retardant and heat-insulating strip and an inner aerogel sheet. Because the outer strip has good elasticity, it can improve strength during the assembly process. Furthermore, since cell 2 failures all occur in the central region of the battery, the thickness of the central aerogel and other heat-insulating and flame-retardant materials is reduced to provide space for cell 2 expansion. Simultaneously, some of the gaps in the middle can also serve as insulation areas for heat conduction, thus better ensuring that thermal runaway between cells 2 does not propagate. The thickness of the strip is not constant; it is adjusted according to the actual expansion curve of cell 2 and the pressure resistance of the strip to ensure a certain gap exists between cells 2 after assembly.

[0039] Furthermore, the thickness of the recessed portion 302 is less than the width of the allowance gap 201.

[0040] In this embodiment, the spacer 3 provided in the clearance gap 201 has a stop portion 301 and a recessed portion 302, the thickness of which is less than the width of the clearance gap 201. This design ensures that the recessed portion 302 can fully accommodate the expansion and deformation of the battery cell 2, avoiding the restriction of the expansion space of the battery cell 2 due to excessive thickness of the recessed portion 302. At the same time, it also makes the spacer 3 fit more snugly in the clearance gap 201, improving the overall stability and reliability.

[0041] Furthermore, it also includes a liquid-cooled base plate 4 disposed within the accommodating space 101, and the liquid-cooled base plate 4 abuts against a plurality of battery cells 2. The liquid-cooled base plate 4 has a flow channel 401, the width of which is 3 to 10 mm.

[0042] In this embodiment, to ensure a larger contact area between the battery cell 2 and the liquid cooling plate, and to increase the heat exchange between the cold plate and the battery cell 2, a wide flow channel 401 design is selected for the liquid-cooled battery pack. This liquid cooling base plate 4 can achieve high-level temperature control of the battery cell 2, with the temperature difference between the battery cells 2 within the same battery pack not exceeding 2°C. This can better improve the battery's lifespan, enhance the consistency between batteries, and reduce maintenance costs. The wide flow channel 401 design has various lengths and widths, but it basically satisfies the requirement of using a single, continuous flow channel 401 for heat dissipation of the battery cell 2, with a contact area with the bottom projection of the battery cell 2 not less than 70% of the bottom area of ​​the battery cell 2. This solves the problem of poor heat dissipation caused by a small contact area between the cold plate and the battery cell 2, which also increases the performance requirements of the liquid cooling equipment and leads to increased system costs.

[0043] Furthermore, the accommodating space 101 has an opening 102 and also includes a first cover plate 5 and a second cover plate 6 disposed adjacent to each other on the bottom shell 1 to block the opening 102.

[0044] In this embodiment, the accommodating space 101 of the bottom shell 1 has an opening 102. The first cover plate 5 and the second cover plate 6 are adjacent to each other on the bottom shell 1, blocking the opening 102. The first cover plate 5 and the second cover plate 6 effectively protect the internal components such as the battery cell 2, preventing external factors from damaging the battery pack. At the same time, they also ensure the sealing of the battery pack, avoiding problems such as liquid leakage, and further improving the safety and reliability of the battery pack. The two flexibly detachable cover plates are the electrical installation panel and the fire protection installation panel, respectively. The electrical installation panel is fastened to the liquid-cooled base plate 4 and the upper cover by bolts. The whole is made of sheet metal bending or stamping. The front middle part is a flat area that can be quickly laid out and replaced according to the supplier's electrical connector model and installation requirements, reducing the cost of design changes and enabling better system compatibility with multiple suppliers. The fire protection mounting plate is fastened to the upper cover with bolts. The whole is made of sheet metal stamping or bending design, ensuring that the middle area is a raised plane. Sensors, fire sprinklers and pressure relief valves and other fire protection products that do not require internal wiring are placed on it. If there are changes in models or manufacturers, the layout and replacement can be quickly carried out according to the installation requirements, reducing the cost of design changes and providing better system compatibility with multiple suppliers.

[0045] Furthermore, a fire sensor 7 is also included, which is mounted on the second cover plate 6 and located on the side of the second cover plate 6 away from the receiving space 101.

[0046] In this embodiment, an external dedicated fire sensor 7 is selected, eliminating the need for internal installation and reducing the difficulty of later maintenance. Maintenance or replacement can be performed only on the panel. The fire sensor 7 is placed on the second cover plate 6, and its position can be adjusted according to the layout of the internal battery cells 2 to adjust the detection area and optimize the external communication wiring logic.

[0047] Furthermore, the thickness of the flexible abutment 301 in its uncompressed state is 2.2 mm, and the width of the allowance gap 201 is 1.6 mm.

[0048] In this embodiment, the flexible abutment 301 has a thickness of 2.2 mm in its uncompressed state, while the width of the clearance gap 201 is 1.6 mm. This dimensional design allows the abutment 301 to fit tightly against the battery cell 2 under normal conditions, providing stable support and restraint. Simultaneously, the width of the clearance gap 201 also accommodates the expansion requirements of the battery cell 2 to a certain extent, preventing damage to the battery cell 2 due to insufficient space. This precise dimensional control helps improve the performance and reliability of the battery pack. Furthermore, when the battery cell 2 undergoes thermal expansion and contraction, the abutment 301 can adapt to these changes to a certain extent, ensuring the stability of the battery pack under various operating conditions.

[0049] Furthermore, the thickness of the recessed portion 302 is 1.5 mm.

[0050] In this embodiment, the thickness of the recessed portion 302 of the spacer 3 is precisely 1.5 mm in the energy storage liquid-cooled battery pack. This design fully considers the characteristics and operating environment of the battery cell 2, providing suitable expansion space for the battery cell 2 and effectively improving the reliability and service life of the battery pack.

[0051] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, and all of these should be included in the scope of the claims of the present invention.

Claims

1. An energy storage liquid-cooled battery pack, characterized in that, include: The bottom shell (1) has a receiving space (101). The battery cell (2) consists of several cells arranged at intervals within the accommodating space (101), with a clearance gap (201) formed between two adjacent cells (2). The spacer (3) is disposed within the allowance gap (201), and the two ends of the spacer (3) abut against the battery cells (2) on both sides respectively. The spacer (3) is used to provide space for the expansion and deformation of the battery cells (2).

2. The energy storage liquid-cooled battery pack according to claim 1, characterized in that, The spacer (3) is a flexible component.

3. A liquid-cooled energy storage battery pack according to claim 1 or claim 2, characterized in that, The spacer (3) has a stop (301) and a recess (302). The stop (301) is annular and located around the recess (302). The stop (301) is used to abut against the battery cells (2) on both sides.

4. The energy storage liquid-cooled battery pack according to claim 3, characterized in that, The thickness of the recess (302) is less than the width of the allowance gap (201).

5. The energy storage liquid-cooled battery pack according to claim 1, characterized in that, Also includes: A liquid-cooled base plate (4) is disposed in the accommodating space (101) and abuts against a plurality of the battery cells (2). The liquid-cooled base plate (4) has a flow channel (401) with a width of 3 to 10 mm.

6. The energy storage liquid-cooled battery pack according to claim 1, characterized in that, The receiving space (101) has an opening (102) and further includes: A first cover plate (5) and a second cover plate (6) are arranged adjacent to each other on the bottom shell (1) to block the opening (102).

7. The energy storage liquid-cooled battery pack according to claim 6, characterized in that, Also includes: Fire sensor (7) is disposed on the second cover plate (6) on the side of the second cover plate (6) away from the receiving space (101).

8. The energy storage liquid-cooled battery pack according to claim 3, characterized in that, The thickness of the flexible abutment (301) in its uncompressed state is 2.2 mm, and the width of the allowance gap (201) is 1.6 mm.

9. The energy storage liquid-cooled battery pack according to claim 3, characterized in that, The thickness of the recess (302) is 1.5 mm.

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