Energy storage liquid-cooled battery pack and energy storage bin

Abstract

The utility model relates to an energy storage liquid-cooled battery pack and an energy storage bin. The energy storage liquid cooling battery pack comprises a battery box body which comprises a bottom frame, a liquid cooling plate, a module supporting beam and a front panel; the battery module is fixed on the module supporting beam, and a heat-conducting structural adhesive is arranged between the bottom of the battery module and the liquid cooling plate; a box cover; the box cover covers the top of the battery module and is connected with the bottom frame into a whole through the front panel, the box cover, the front panel and the battery box body define a frame structure with the left side, the right side and the rear side being hollowed out, and the left side, the right side and the rear side of the battery module are in contact with outside air through the hollowed-out parts. The battery pack adopts an open design, the battery cells on the left side, the right side and the rear side of the battery pack are in direct contact with outside air, the heat dissipation effect is better, and the design, raw material, production and detection costs are reduced; the uniform temperature performance of each battery cell in the battery pack can be ensured, and the service life is prolonged.

Description

Technical Field

[0001] This application relates to the field of energy storage batteries, in particular to an energy storage liquid-cooled battery pack and an energy storage bin. Background Art

[0002] With the progress and development of the technology in the energy storage lithium battery industry, higher capacity and charge-discharge rate have become the mainstream technical directions in the market. However, higher capacity and charge-discharge rate will cause the battery temperature to increase and the temperature difference to widen, thus posing potential safety hazards to the system and accelerating the attenuation of battery life.

[0003] Better temperature consistency, longer service life and safety have become the urgent needs in the current energy storage battery market. In order to achieve better temperature consistency for energy storage batteries, it is necessary to cool the energy storage batteries. Traditional natural cooling and air-cooled battery packs are difficult to meet the requirements of higher capacity and charge-discharge rate energy storage batteries; traditional liquid-cooled system battery packs adopt a closed design, which has high requirements for the protection level, at least reaching IP65, and even above IP67. This virtually increases the costs in various aspects such as technology development, raw material procurement, production manufacturing, process and detection.

[0004] Therefore, a new technical solution is needed in this field to solve the above problems. Summary of the Utility Model

[0005] The technical problem to be solved by this application is the problem that traditional closed energy storage liquid-cooled battery packs have high requirements for the protection level and high costs in technology development, raw materials, production manufacturing, process and detection.

[0006] To solve the above technical problems, the present application provides the following technical solutions: A liquid-cooled energy storage battery pack, comprising: a battery box body, the battery box body includes a bottom frame, a liquid-cooled plate, a module support beam and a front panel, the liquid-cooled plate is installed inside the bottom frame, the module support beam is fixed on the bottom frame and located above the liquid-cooled plate, and the front panel is fixed to the front of the bottom frame; a battery module, the battery module is fixed on the module support beam of the battery box body, and a thermally conductive structural adhesive is provided between the bottom of the battery module and the liquid-cooled plate of the battery box body; a box cover, the box cover covers the top of the battery module and is connected to the bottom frame through the front panel to form an integral body, the front panel covers the front of the battery module, the liquid-cooled plate is lined at the bottom of the battery module, and the box cover, the front panel and the battery box body enclose a frame structure with a left hollow, a right hollow and a rear hollow, and the left side, the right side and the rear side of the battery module are respectively in contact with the outside air through the hollow parts. On the basis of improving the protection level, the anti-condensation effect and the reliability of the liquid-cooled pipeline of the energy storage cabinet system, the protection level of the battery pack is reduced. The battery pack adopts an open design. On the left, right and back sides of the battery pack, the battery is directly in contact with the outside air. The battery pack in the energy storage cabinet realizes the combination of liquid cooling and natural cooling, and has a better heat dissipation effect. Since the protection level of the battery pack inside the energy storage cabinet is reduced, the costs of technology development, raw materials, production manufacturing, processes and inspections are greatly reduced, and the production efficiency is improved. The improvement of the protection level of the energy storage cabinet system described in the present application may be to increase the system protection level from IP54 to IP55, and at the same time add dehumidification equipment and adopt measures such as stainless steel pipelines.

[0007] In the preferred technical solution of the above liquid-cooled energy storage battery pack, the box cover is spliced and combined by a front box cover, a middle box cover and a rear box cover. Since the battery pack adopts an open design and there is no protection requirement, there is no need to consider the protection problem during the splicing of the box cover. The box cover is designed in a combined manner and is spliced and combined by a front box cover, a middle box cover and a rear box cover, which reduces the mold development, packaging and transportation and material costs.

[0008] In the preferred technical solution of the above liquid-cooled energy storage battery pack, the cross-section of the box cover is a bottomless rectangular frame. In this way, the box cover can be buckled on the top of the battery module, and at the same time, it can ensure that on the left, right and back sides of the battery pack, the battery is directly in contact with the outside air.

[0009] In the preferred technical solution of the above energy storage liquid-cooled battery pack, the box cover is molded by pressing a single-layer epoxy vinyl glass fiber prepreg heating curable resin PCM. It is formed by laying a single-layer epoxy vinyl glass fiber prepreg on a mold, curing under heating and pressing conditions, and then demolding. The thickness is reduced by more than 50% compared with the traditional box cover, and can reach 0.5 mm. The structure and performance meet the product function and usage requirements, greatly reducing the development cost and product cost. The product has high consistency and stability, and is safe and reliable.

[0010] In the preferred technical solution of the above energy storage liquid-cooled battery pack, the battery box body further includes a component installation beam, a liquid-cooled plate water inlet, and a liquid-cooled plate water outlet. The component installation beam is fixed on the bottom frame and is located above the front part of the liquid-cooled plate. A liquid-cooled plate inlet and a liquid-cooled plate outlet communicating with the liquid-cooled plate are installed on the bottom frame on the front side of the front panel.

[0011] In the preferred technical solution of the above energy storage liquid-cooled battery pack, the battery box body adopts stacked double-layer liquid-cooled plates, and the flow channels of each layer of the liquid-cooled plate adopt a non-uniform distribution design. The liquid-cooled plate adopts a double-layer cold plate design, and the flow channels of each layer of the cold plate adopt a non-uniform refined design, with higher temperature uniformity and heat dissipation efficiency.

[0012] In the preferred technical solution of the above energy storage liquid-cooled battery pack, it further includes: a BMU component, some electrical components, a fire protection component, a maintenance cover, a high-voltage copper bar, and a low-voltage wiring harness, which are installed on the component installation beam of the battery box body by sheet metal.

[0013] In the preferred technical solution of the above energy storage liquid-cooled battery pack, the battery module includes: battery cells, end plates, steel strips, CCS components, spray-coated isolation components, positive and negative bases, and battery cell insulation sheets. The battery cells are separated by the battery cell insulation sheets. The battery cells, battery cell insulation sheets, and end plates are bundled by being sleeved into the steel strip after being extruded by a tooling to form a combination. The CCS component is placed above the combination and welded to the battery cell poles by laser welding to form an integral body. The positive and negative bases are installed on the end plates. The spray-coated isolation component is installed and fixed above the CCS component by snap fasteners. The box cover is installed on the CCS component and the front panel of the battery box body by snap fasteners.

[0014] In the preferred technical solution of the above energy storage liquid-cooled battery pack, the battery module is fixed on the module support beam of the battery box body by high-strength bolts. The battery module is fixed on the module support frame by high-strength bolts, with firm connection, high structural strength, and good stability.

[0015] To solve the problems of high requirements for the protection level of traditional closed energy storage liquid-cooled battery packs, and high costs in technology development, raw materials, manufacturing, processes, and testing, the present application also provides an energy storage bin, which is configured with an energy storage liquid-cooled battery pack described in any one of the above technical solutions.

[0016] The energy storage liquid-cooled battery pack and the energy storage bin of the present application have the following advantages: The present application relates to an energy storage liquid-cooled battery pack with high-efficiency cooling and good battery temperature uniformity performance, which can ensure the temperature uniformity performance of each battery cell in the battery pack and improve the service life of the battery; on the basis of improving the protection level of the energy storage cabinet system, anti-condensation, and the reliability of the liquid-cooling pipeline, the protection level of the battery pack is reduced. The battery pack adopts an open design, and the battery cells on the left and right sides and the rear of the battery pack are directly in contact with the outside air, with better heat dissipation effect, greatly reducing the design, raw materials, manufacturing, process, and testing costs. Compared with the traditional closed liquid-cooled system battery pack, adopting the technical solution provided by the present application, the temperature rise of the battery pack can be reduced by about 2°C, and the cost of the battery pack can be reduced by 5%-10%. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The following describes the preferred embodiments of the present application with reference to the accompanying drawings, in which:

[0018] Figure 1 is an exploded view of an energy storage liquid-cooled battery pack according to an embodiment provided by the present application;

[0019] Figure 2 is Figure 1 an exploded view of a battery module in the energy storage liquid-cooled battery pack;

[0020] Figure 3 is Figure 1 an exploded view of a battery box body in the energy storage liquid-cooled battery pack.

[0021] LIST OF REFERENCE NUMERALS: 010, battery box body; 011, bottom frame; 012, liquid-cooling plate; 013, front panel; 014, module support beam; 015, component installation beam; 016, liquid-cooling plate water inlet; 017, liquid-cooling plate water outlet; 020, battery module; 021, battery cell; 022, die-cast aluminum end plate; 023, steel strip; 024, CCS component; 025, spray-coated isolation component; 026, battery cell insulation sheet; 027, positive and negative electrode base; 030, thermally conductive structural adhesive; 040, BMU component; 050, partial electrical component; 060, fire protection component; 070, box cover; 071, front box cover; 072, middle box cover; 073, rear box cover; 080, maintenance cover; 090, high-voltage copper bar; 100, low-voltage wiring harness. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The preferred embodiments of the present application will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present application and are not intended to limit the protection scope of the present application.

[0023] It should be noted that in the description of the present application, the terms indicating the direction or positional relationship such as "upper", "lower", "left", "right", "front", "rear", "inner", "outer", etc. are based on the direction or positional relationship shown in the drawings. This is only for convenience of description and does not indicate or imply that the device or component 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.

[0024] In addition, it should also be noted that in the description of the present application, unless otherwise clearly specified and defined, the terms "installation", "setting", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and can also be the communication inside two components. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0025] In order to solve or to a certain extent improve the problems in the prior art that the traditional closed energy storage liquid-cooled battery pack has high requirements for protection level and high costs in technology development, raw materials, production manufacturing, processes and testing, the present application provides an energy storage liquid-cooled battery pack, which mainly consists of a battery box body 010, a battery module 020, a thermal conductive structural adhesive 030, a BMU assembly 040, some electrical components 050, a fire protection component 060, a box cover 070, an inspection cover 080, a high-voltage copper busbar 090 and a low-voltage wire harness 100.

[0026] As Figures 1 to 3 shown, specifically, the battery box body 010 integrates a bottom frame 011, a liquid-cooling plate 012, a front panel 013, a module support beam 014, a component installation beam 015, a liquid-cooling plate water inlet 016 and a liquid-cooling plate water outlet 017. The battery box body 010 adopts an integrated design, in which the liquid-cooling plate 012 adopts a double-layer cold plate design, and the flow channels of each layer of the cold plate adopt a non-uniform refined design, having higher temperature uniformity and heat dissipation efficiency. The front panel 013 can install some electrical components 050, the inspection cover 080 and the box cover 070.

[0027] As Figure 1 and Figure 2As shown, the battery module 020 mainly consists of battery cells 021, die-cast aluminum end plates 022, steel strips 023, CCS components (integrated busbars for energy storage battery modules) 024, spray-coated isolation components 025, battery cell insulation sheets 026, and positive and negative bases 027. The battery module 020 is fixed to the module support beam 014 of the battery box 010 using high-strength bolts. A thermal conductive structural adhesive 030 is designed between the bottom of the battery module 020 and the liquid cooling plate 012. The thermal conductive structural adhesive 030 can not only reinforce the installation and fixation of the battery module 020 on the module support beam 014 but also ensure the heat conduction efficiency between the battery cells 021 and the liquid cooling plate 012. Die-cast aluminum end plates have good thermal conductivity, low density, high structural strength, and corrosion resistance.

[0028] The battery cells 021 are separated by the battery cell insulation sheets 026, which are made of mica or aerogel. The battery cells, battery cell insulation sheets, and end plates are inserted into the steel strip 023 through tooling extrusion for bundling to form an assembly. The CCS component 024 is placed above the assembly and laser welded to the battery cell poles to form an integral body. The positive and negative bases 027 are installed on the die-cast aluminum end plates 022, and the spray-coated isolation component 025 is installed and fixed above the CCS component 024 through snap fasteners, which has the function of preventing the spread of thermal runaway.

[0029] As Figure 1 and Figure 3 shown, the BMU component (battery management system) 040, some electrical components 050, and fire protection components 060 are installed on the component installation beam 015 at the front bottom of the battery box 010 through sheet metal.

[0030] As Figure 1 shown, the box cover 070 adopts a combined design and is spliced and combined by a front box cover 071, a middle box cover 072, and a rear box cover 073. This reduces the mold development, packaging and transportation, and material costs of the box cover 070. Since the battery pack adopts an open design and has no protection requirements, the box cover 070 is directly installed on the CCS component 024 above the battery module 020 and the front panel 013 of the battery box 010 through snap fasteners, which is convenient and quick to install. In addition, adopting an open design greatly improves the heat dissipation efficiency and reduces the high-temperature safety hazards.

[0031] As Figure 1As shown, the box cover 070 is molded by pressing a single-layer epoxy vinyl glass fiber prepreg with a heat-curable resin PCM. It is formed by laying a single-layer epoxy vinyl glass fiber prepreg on a mold, curing under heating and pressurization conditions, and then demolding. The thickness of the box cover 070 is reduced by more than 50% compared to the traditional box cover, and can reach 0.5 mm. The structural strength and performance of the box cover 070 meet the product function and performance requirements, greatly reducing the development cost and product cost. The product has high consistency and stability, is safe and reliable. The box cover molded by pressing a single-layer epoxy vinyl glass fiber prepreg with a heat-curable resin PCM is the first application in the energy storage industry.

[0032] Based on improving the protection level, anti-condensation effect, and reliability of the liquid cooling pipeline of the energy storage cabinet system, this application reduces the protection level of the battery pack. The battery pack adopts an open design, and the battery cells on the left, right, and rear sides of the battery pack are directly in contact with the outside air. The battery pack in the energy storage cabinet realizes the combination of liquid cooling and natural cooling, with better heat dissipation effect. Since the protection level of the battery pack inside the energy storage cabinet is reduced, the costs of technology development, raw materials, production manufacturing, processes, and inspections are greatly reduced, improving production efficiency. The improvement of the protection level of the energy storage cabinet system described in this application can be to increase the system protection level from IP54 to IP55, and at the same time add dehumidification equipment and adopt measures such as stainless steel pipelines. Compared with the battery pack of the traditional closed liquid cooling system, by adopting the technical solution provided in this application, the temperature rise of the battery pack can be reduced by about 2°C, and the cost of the battery pack can be reduced by 5%-10%.

[0033] This application also provides an energy storage bin (not shown in the figure), and the energy storage bin is configured with the energy storage liquid cooling battery pack described in any one of the above technical solutions.

[0034] So far, the technical solutions of this application have been described in combination with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of this application is obviously not limited to these specific embodiments. Without departing from the principle of this application, those skilled in the art can make equivalent changes or replacements to the relevant technical features, and the technical solutions after these changes or replacements will all fall within the protection scope of this application.

Claims

1. A liquid-cooled energy storage battery pack, characterized in that: include: A battery box, the battery box comprising a bottom frame, a liquid cooling plate, a module support beam and a front panel, the liquid cooling plate being installed inside the bottom frame, the module support beam being fixed on the bottom frame and being located above the liquid cooling plate, and the front panel being fixed on the front of the bottom frame; A battery module, wherein the battery module is fixed on the module support beam of the battery box, and a heat-conducting structural adhesive is provided between the bottom of the battery module and the liquid cooling plate of the battery box; A box cover, wherein the box cover covers the top of the battery module and is connected to the bottom frame through the front panel, the front panel covers the front of the battery module, the liquid cooling plate is padded at the bottom of the battery module, the box cover, the front panel and the battery box body form a frame structure with a hollow left side, a hollow right side and a hollow rear side, and the left side, the right side and the rear side of the battery module are in contact with the outside air through the hollow parts respectively.

2. The energy storage liquid-cooled battery pack according to claim 1, characterized in that: The box cover is formed by splicing and assembling a front box cover, a middle box cover and a rear box cover.

3. The energy storage liquid-cooled battery pack according to claim 1, characterized in that: The cross section of the box cover is a rectangular frame without a bottom edge.

4. The energy storage liquid-cooled battery pack according to claim 1, characterized in that: The box cover is formed by compression molding using a single layer of epoxy vinyl glass fiber prepreg and heat curing resin PCM.

5. The energy storage liquid-cooled battery pack according to claim 1, characterized in that: The battery box also includes a component mounting beam, a liquid cooling plate water inlet and a liquid cooling plate water outlet. The component mounting beam is fixed to the bottom frame and is located above the front of the liquid cooling plate. The bottom frame on the front side of the front panel is equipped with a liquid cooling plate inlet and a liquid cooling plate outlet that are connected to the liquid cooling plate.

6. The energy storage liquid-cooled battery pack according to claim 1, characterized in that: The battery box adopts a stacked double-layer liquid cooling plate, and the flow channel of each layer of the liquid cooling plate adopts a non-uniform distribution design.

7. The energy storage liquid-cooled battery pack according to claim 5, characterized in that: Also includes: The BMU components, some electrical components, fire protection components, inspection covers, high-voltage copper busbars and low-voltage wiring harnesses are mounted on the component mounting beams of the battery box through sheet metal.

8. The energy storage liquid-cooled battery pack according to claim 1, characterized in that: The battery module includes: battery cells, end plates, steel strips, CCS components, spray-painted isolation components, positive and negative electrode bases and battery cell insulating sheets. The battery cells are separated by the battery cell insulating sheets. The battery cells, battery cell insulating sheets and end plates are extruded by tooling and then inserted into steel strips to be bundled and formed into an assembly. The CCS component is placed above the assembly and is laser welded to the battery cell poles. The positive and negative electrode bases are mounted on the end plates. The spray-painted isolation component is fixed above the CCS component by rivets. The box cover is mounted on the CCS component and the front panel of the battery box by rivets.

9. The energy storage liquid-cooled battery pack according to claim 1, characterized in that: The battery module is fixed to the module support beam of the battery box by high-strength bolts.

10. An energy storage bin, characterized in that: The energy storage compartment is equipped with an energy storage liquid-cooled battery pack as described in any one of claims 1 to 9.

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