CN116937007A

CN116937007A - Energy storage device and energy storage system

Info

Publication number: CN116937007A
Application number: CN202311189530.0A
Authority: CN
Inventors: 洪纯省
Original assignee: Xiamen Hithium Energy Storage Technology Co Ltd
Current assignee: Xiamen Hithium Energy Storage Technology Co Ltd
Priority date: 2023-09-15
Filing date: 2023-09-15
Publication date: 2023-10-24
Anticipated expiration: 2043-09-15
Also published as: CN116937007B

Abstract

The application provides an energy storage device and an energy storage system. The liquid cooling module is used for being installed between two battery modules. The liquid cooling module comprises a liquid cooling plate, an elastic support and heat-conducting glue. The elastic support is arranged between the liquid cooling plate and the battery module. The elastic support comprises two first elastic support strips arranged at intervals along the length direction of the liquid cooling plate and a second elastic support strip extending along the length direction of the liquid cooling plate, and the second elastic support strip is connected between the two first elastic support strips. The two first elastic support strips, the second elastic support strips, the liquid cooling plate and the battery module are surrounded to form a containing space with an opening for containing heat-conducting glue. According to the liquid cooling module, the elastic support is arranged on one side, facing the battery module, of the liquid cooling plate, and the elastic support, the liquid cooling plate and the battery module are surrounded to form the accommodating space capable of accommodating the heat conducting glue. Heat in the battery module is conducted into the liquid cooling plate by utilizing the heat conducting glue, so that the heat transfer efficiency is improved, and the cooling effect of the liquid cooling plate on the battery module is improved.

Description

Energy storage device and energy storage system

Technical Field

The application belongs to the technical field of energy storage devices, and particularly relates to an energy storage device and an energy storage system.

Background

In the related art, the liquid cooling plate is generally formed of a metal plate, and the liquid cooling plate cannot be in good contact with the surface of the battery due to the rugged surface of the liquid cooling plate in the flow path processing process. The area of contact of liquid cooling board and battery can't satisfy the demand, then lead to the heat conduction efficiency between liquid cooling board and the battery lower to lead to the battery heat dissipation can't satisfy the demand, bring battery life reduction and thermal runaway's security risk.

In addition, the liquid cooling plate and the battery shell are metal pieces, and the direct contact can have short circuit risks, and the problem of battery safety risks is also solved, so that the problems of heat conduction and insulation between the liquid cooling plate and the battery are required to be solved simultaneously. In the prior art, insulation and heat dissipation conduction are realized by arranging a heat conduction silica gel pad between the liquid cooling plate and the battery, but the common liquid cooling plate is arranged at the bottom end of the battery module at present, the heat conduction pad is clamped between the battery module and the bottom plate of the battery box body, the heat conduction pad is assembled conveniently by the gravity of the battery module, and the heat conduction pad is reliably clamped between the battery module and the liquid cooling plate; but has a problem of low heat dissipation efficiency.

Disclosure of Invention

In view of the above, the present application provides an energy storage device and an energy storage system. An elastic support is arranged between the liquid cooling plate and the battery module. The elastic support, the liquid cooling plate and the battery module are enclosed to form a containing space with an opening and capable of containing heat conducting glue, and the heat conducting glue is used for conducting heat in the battery module to the liquid cooling plate, so that heat transfer efficiency is improved, and the cooling effect of the liquid cooling plate on the battery module is improved.

The first aspect of the present application provides an energy storage device comprising:

at least two battery modules;

the liquid cooling module is used for being arranged between two adjacent battery modules; wherein, the liquid cooling module includes:

the liquid cooling plate is provided with a cold plate flow channel which is used for accommodating cooling liquid;

the elastic support is clamped between the liquid cooling plate and the battery module, one side of the elastic support, which is away from the liquid cooling plate, is in abutting press fit with the battery module, and one side of the elastic support, which is facing the battery module, is in abutting press fit with the liquid cooling plate; the elastic support comprises two first elastic support strips and a second elastic support strip, the two first elastic support strips are arranged at intervals along the length direction of the liquid cooling plate, the second elastic support strips extend along the length direction of the liquid cooling plate, and the second elastic support strips are connected to the same side of the two first elastic support strips; the two first elastic support strips, the second elastic support strip, the liquid cooling plate and the battery module are surrounded to form a containing space with an opening; and

And the heat-conducting glue is arranged in the accommodating space.

The energy storage device provided by the first aspect of the application comprises a battery module and a liquid cooling module, wherein the liquid cooling module comprises a liquid cooling plate, an elastic support and heat-conducting glue. The liquid cooling plate is internally provided with a cold plate flow passage, and cooling liquid can circulate in the cold plate flow passage to carry heat away from the liquid cooling plate. The elastic support is clamped between the liquid cooling plate and the battery module. The elastic support strip, the liquid cooling plate and the battery module of the elastic support enclose to form a containing space capable of containing heat conducting glue, and the heat conducting glue is used for conducting heat in the battery module to the liquid cooling plate, so that heat transfer efficiency is improved, and the cooling effect of the liquid cooling plate on the battery module is improved. In addition, the elastic support surrounds and defines a containing space filled with heat-conducting glue, and glue overflow can be prevented.

And each elastic support is composed of two first elastic support strips and one second elastic support strip, the elastic support can be understood as a U-shaped elastic support, the accommodating space surrounded by the elastic supports is also a U-shaped space, and therefore heat-conducting glue is conveniently injected from an opening of the U-shaped space, and the operation difficulty is reduced.

Therefore, the elastic support is arranged on one side of the liquid cooling plate, which faces the battery module, and the elastic support, the liquid cooling plate and the battery module are surrounded to form a containing space capable of containing the heat-conducting glue. Heat in the battery module is conducted into the liquid cooling plate by utilizing the heat conducting glue, so that the heat transfer efficiency is improved, and the cooling effect of the liquid cooling plate on the battery module is improved.

The liquid cooling plate comprises a first plate body and a second plate body which are oppositely arranged along the width direction of the liquid cooling plate, the first plate body comprises a first runner part and a first connecting part which is arranged around the periphery of the first runner part in a surrounding mode, the first runner part protrudes out of the first connecting part, the second plate body comprises a second runner part and a second connecting part which is arranged around the periphery of the second runner part in a surrounding mode, the second runner part protrudes out of the second connecting part, the first connecting part is fixedly connected with the second connecting part, a cold plate runner is formed between the first runner part and the second runner part, and the outer surfaces of the first runner part and the second runner part respectively comprise two end faces which are oppositely arranged along the height direction of the liquid cooling plate and side faces which are connected between the two end faces in a bending mode;

The side surface is concavely provided with at least one exhaust passage, two ends of the exhaust passage extending along the height direction of the liquid cooling plate respectively penetrate through the two end surfaces, and the exhaust passage is communicated with the accommodating space and the opening of the accommodating space.

The exhaust passage comprises a first side wall and a second side wall which are arranged at intervals along the length direction of the liquid cooling plate, a plurality of grooves which are arranged at intervals are respectively concavely formed in the first side wall and the second side wall, and the grooves of the first side wall and the grooves of the second side wall are oppositely arranged.

The exhaust channels of the first plate body and the exhaust channels of the second plate body are arranged in a staggered mode; along the thickness direction of the liquid cooling plate, the vertical distance between the exhaust passage of the first plate body and the second plate body is d1, the vertical distance between the exhaust passage of the second plate body and the first plate body is d1, and the maximum vertical distance between the first plate body and the second plate body is d2, wherein d1/d2 is more than or equal to 1/2 and less than or equal to 3/4.

The battery module comprises a plurality of single batteries which are arranged along the length direction of the liquid cooling plate, and the orthographic projection of one exhaust passage on the battery module falls into the range of one single battery.

The liquid cooling plate comprises a first plate body and a second plate body which are oppositely arranged along the width direction of the liquid cooling plate, wherein the first plate body comprises a first runner part and a first connecting part which is surrounded on the periphery of the first runner part, the first runner part protrudes out of the first connecting part, the second plate body comprises a second runner part and a second connecting part which is surrounded on the periphery of the second runner part, the second runner part protrudes out of the second connecting part, the first connecting part is fixedly connected with the second connecting part, and a cold plate runner is formed between the first runner part and the second runner part;

the first connecting portion with the protruding projection that is equipped with of second connecting portion, the elastic support is including facing towards the first surface of liquid cooling board with deviate from the second surface of liquid cooling board, the elastic support is equipped with and runs through the first surface with the through-hole of second surface is used for the holding at least part the projection.

The size of the convex column is h1, the size of the elastic support is h2, and h2 is larger than h1 along the width direction of the liquid cooling plate; wherein (h 2-h 1)/h 2 is more than or equal to 1/6 and less than or equal to 1/2.

Wherein the plurality of convex columns comprise a first convex column arranged in the through hole of the first elastic support strip and a second convex column arranged in the through hole of the second elastic support strip; the battery module comprises a plurality of single batteries which are arranged along the length direction of the liquid cooling plate, and the orthographic projection of the second convex column of the battery module falls into a gap between two adjacent single batteries.

The battery module comprises a plurality of single batteries which are arranged at intervals along the length direction of the liquid cooling plate, a protrusion is arranged on one side of the second elastic support strip, which faces the battery module, and the protrusion is arranged in a gap between two adjacent single batteries and is in interference fit with the two adjacent single batteries.

Each single battery comprises a first side plate facing the liquid cooling plate and a second side plate facing the adjacent single battery, wherein an R angle is formed at the joint of the first side plate and the second side plate; the protrusions are arranged in gaps between the R angle of one single battery and the R angles of the adjacent single batteries, and the shapes of the protrusions are matched with the adjacent two R angles.

In a second aspect, the present application provides an energy storage system comprising:

user load;

the electric energy conversion device is used for converting other forms of energy into electric energy, the electric energy conversion device is electrically connected with the user load, and the electric energy converted by the electric energy conversion device is used for supplying power for the user load; and

According to the energy storage device provided by the first aspect of the application, the user load and the electric energy conversion device are respectively and electrically connected, the energy storage device stores the electric energy converted by the electric energy conversion device, and the energy storage device supplies power for the user load.

According to the energy storage system provided by the second aspect of the application, by adopting the energy storage device provided by the first aspect of the application, the elastic support is arranged on one side of the liquid cooling plate, which faces the battery module, and the elastic support, the liquid cooling plate and the battery module are surrounded to form the accommodating space capable of accommodating the heat-conducting glue. Heat in the battery module is conducted into the liquid cooling plate by utilizing the heat conducting glue, so that the heat transfer efficiency is improved, and the cooling effect of the liquid cooling plate on the battery module is improved. When the energy storage device supplies power for the user load, the energy storage device can provide a stable power supply for the user load.

Drawings

In order to more clearly explain the technical solutions in the embodiments of the present application, the drawings that are used in the embodiments of the present application will be described below.

Fig. 1 is a schematic structural diagram of an energy storage system according to an embodiment of the application.

Fig. 2 is a circuit block diagram of an energy storage system according to an embodiment of the application.

Fig. 3 is a schematic structural diagram of an energy storage device according to an embodiment of the application.

Fig. 4 is an exploded view of an energy storage device according to an embodiment of the present application.

Fig. 5 is a schematic structural diagram of a liquid cooling module according to an embodiment of the application.

Fig. 6 is an exploded view of a liquid cooling plate according to an embodiment of the present application.

Fig. 7 is a schematic structural view of an elastic support according to an embodiment of the application.

Fig. 8 is a partial enlarged view of fig. 5.

Fig. 9 is a cross-sectional view of a liquid cooling plate according to an embodiment of the present application.

Fig. 10 is a schematic structural diagram of a liquid cooling module according to another embodiment of the application.

Fig. 11 is a schematic structural diagram of two adjacent unit cells according to an embodiment of the application.

Fig. 12 is a bottom view of fig. 11.

Fig. 13 is a schematic structural view of an elastic support according to another embodiment of the present application.

Fig. 14 is a bottom view of a liquid cooling module according to an embodiment of the application.

Fig. 15 is a bottom view of a liquid cooling module according to another embodiment of the application.

Fig. 16 is a partial enlarged view of fig. 15.

Description of the reference numerals: the energy storage system-1, the user load-11, the electric energy conversion device-12, the energy storage device-2, the battery module-21, the battery cell-211, the first side plate-2111, the second side plate-2112, the R angle-2113, the surface to be cooled-22, the liquid cooling module-3, the liquid cooling plate-31, the base plate-311, the first plate body-311 a, the second plate body-311 b, the liquid guiding groove-3111, the cold plate channel-3112, the protrusion-3113, the groove-3114, the bump-3115, the exhaust channel-3116, the first side wall-3116 a, the second side wall-3116 b, the protrusion-3117, the first protrusion-3117 a, the second protrusion-3117 b, the first flow channel portion-3118 a, the second flow channel portion-3118 b, the first connection portion-3119 a, the second connection portion-3119 b, the elastic support-32, the first elastic support bar-321, the second elastic support bar-322, the accommodation space-323, the first surface-324, the second surface-326, the second surface-327, the through hole-327.

Detailed Description

The following are preferred embodiments of the present application, and it should be noted that modifications and variations can be made by those skilled in the art without departing from the principle of the present application, and these modifications and variations are also considered as the protection scope of the present application.

Because of the strong timeliness and space properties of energy required by people, in order to reasonably utilize the energy and improve the utilization rate of the energy, one energy form needs to be stored by one medium or equipment and then converted into another energy form, and the energy is released in a specific energy form based on future application. At present, the main way of generating green electric energy is to develop green energy sources such as photovoltaic, wind power and the like to replace fossil energy sources.

At present, the generation of green electric energy generally depends on photovoltaic, wind power, water potential and the like, but wind energy, solar energy and the like generally have the problems of strong intermittence and large fluctuation, which can cause unstable power grid, insufficient peak electricity consumption, too much electricity consumption and unstable voltage can cause damage to the electric power, so that the problem of 'wind abandoning and light abandoning' possibly occurs due to insufficient electricity consumption requirement or insufficient power grid acceptance, and the problem needs to be solved by relying on energy storage. The energy is converted into other forms of energy through physical or chemical means and is stored, the energy is converted into electric energy when needed and released, in short, the energy storage is similar to a large-scale 'charge pal', the electric energy is stored when the photovoltaic and wind energy are sufficient, and the stored electric power is released when needed.

Taking electrochemical energy storage as an example, the scheme provides an energy storage device, wherein a group of chemical batteries are arranged in the energy storage device, chemical elements in the batteries are mainly used as energy storage media, and the charge and discharge process is accompanied with chemical reaction or change of the energy storage media.

The present energy storage (i.e. energy storage) application scenario is comparatively extensive, including aspects such as power generation side energy storage, electric wire netting side energy storage and power consumption side energy storage, and the kind of corresponding energy storage device includes:

(1) The large energy storage power station applied to the wind power and photovoltaic power station side can assist renewable energy sources to generate electricity to meet grid-connected requirements, and meanwhile, the utilization rate of the renewable energy sources is improved; the energy storage power station is used as a high-quality active/reactive power regulating power supply in a power supply side, so that the load matching of electric energy in time and space is realized, the capacity of absorbing renewable energy sources is enhanced, the instantaneous power change is reduced, the impact on a power grid is reduced, the problem of generating and absorbing new energy sources is solved, and the energy storage power station has great significance in the aspects of standby of a power grid system, relieving peak load power supply pressure and peak regulation and frequency modulation.

(2) The energy storage container applied to the power grid side has the functions of mainly peak regulation, frequency modulation and power grid blocking and peak regulation relieving, and can realize peak clipping and valley filling of the power consumption load, namely, the energy storage battery is charged when the power consumption load is low, and the stored electric quantity is released in the peak period of the power consumption load, so that the balance between power production and power consumption is realized.

(3) The small energy storage cabinet applied to the electricity utilization side has the main functions of spontaneous electricity utilization, peak Gu Jiacha arbitrage, capacity cost management and power supply reliability improvement. According to the different application scenes, the electricity-side energy storage can be divided into an industrial and commercial energy storage cabinet, a household energy storage device, an energy storage charging pile and the like, and is generally matched with the distributed photovoltaic. The energy storage can be used by industrial and commercial users for valley peak price difference arbitrage and capacity cost management. In the electric power market implementing peak-valley electricity price, the energy storage system is charged when the electricity price is low, and the energy storage system is discharged when the electricity price is high, so that peak-valley electricity price difference arbitrage is realized, and the electricity cost is reduced. In addition, the energy storage system is suitable for two industrial enterprises with electricity price, can store energy when electricity is used in low valley and discharge the energy when the electricity is used in peak load, so that peak power and the declared maximum demand are reduced, and the purpose of reducing the capacity electricity fee is achieved. The household photovoltaic distribution and storage can improve the spontaneous self-use level of the electric power. Due to high electricity prices and poor power supply stability, the photovoltaic installation requirements of users are pulled. Considering that the photovoltaic power generation is performed in daytime, and the load of a user is generally higher at night, the photovoltaic power can be better utilized through configuration of energy storage, the spontaneous self-use level is improved, and meanwhile the power consumption cost is reduced. In addition, the fields of communication base stations, data centers and the like need to be configured with energy storage for standby power.

Referring to fig. 1 and 2, fig. 1 is a schematic structural diagram of an energy storage system according to an embodiment of the application. Fig. 2 is a circuit block diagram of an energy storage system according to an embodiment of the application. The embodiment of fig. 1 of the present application is illustrated by taking a power generation/distribution side shared energy storage scenario as an example, and the energy storage device of the present application is not limited to the power generation/distribution side energy storage scenario.

The application provides an energy storage system 1, wherein the energy storage system 1 comprises a user load 11, an electric energy conversion device 12 and the energy storage device 2 provided by the application. The electric energy conversion device 12 is used for converting other forms of energy sources into electric energy, the electric energy conversion device 12 is electrically connected with the user load 11, and the electric energy converted by the electric energy conversion device 12 supplies power to the user load 11. The energy storage device 2 is electrically connected with the user load 11 and the electric energy conversion device 12 respectively, the energy storage device 2 stores the electric energy converted by the electric energy conversion device 12, and the energy storage device 2 supplies power for the user load 11.

The user load 11 may be a high voltage cable. The power conversion device 12 includes a first power conversion device and a second power conversion device. The energy storage system 1 comprises: the high-voltage cable, the first electric energy conversion device, the second electric energy conversion device and the energy storage device 2 provided by the application are used for converting other forms of energy into electric energy under the power generation condition, the electric energy conversion device and the second electric energy conversion device are connected with the high-voltage cable and are supplied to the power utilization side of the distribution network for use, when the power utilization load is lower, the first electric energy conversion device and the second electric energy conversion device store more generated electric energy into the energy storage device 2 when the power generation is excessive, the wind abandoning and the light abandoning rate are reduced, and the problem of power generation and consumption of new energy is improved; when the power consumption load is high, the power grid gives an instruction, the electric quantity stored by the energy storage device 2 is cooperated with the high-voltage cable to transmit electric energy to the power consumption side for use in a grid-connected mode, various services such as peak regulation, frequency modulation and standby are provided for the operation of the power grid, the peak regulation effect of the power grid is fully exerted, peak clipping and valley filling of the power grid are promoted, and the power supply pressure of the power grid is relieved.

Optionally, the first and second electric energy conversion devices may convert at least one of solar energy, optical energy, wind energy, thermal energy, tidal energy, biomass energy, mechanical energy, and the like into electric energy.

The number of the energy storage devices 2 may be plural, the plural energy storage devices 2 are connected in series or in parallel, and the plural energy storage devices 2 are supported and electrically connected by using a separator not shown. In the present embodiment, "a plurality of" means two or more. The energy storage device 2 may be further provided with an energy storage box for accommodating the energy storage device 2.

Alternatively, the energy storage device 2 may include, but is not limited to, a battery cell, a battery module, a battery pack, a battery system, and the like. The practical application form of the energy storage device 2 provided in the embodiment of the present application may be, but not limited to, the listed products, and may also be other application forms, and the embodiment of the present application does not strictly limit the application form of the energy storage device 2. The embodiment of the present application will be described by taking the energy storage device 2 as a multi-core battery as an example. When the energy storage device 2 is a single battery, the energy storage device 2 may be at least one of a cylindrical battery, a prismatic battery, and the like.

The application provides a liquid cooling plate arranged on the side surface and used for radiating the battery modules on both sides. However, the heat conducting pad is a soft sheet during side assembly, and the process of assembling the liquid cooling plate with the heat conducting pad after the heat conducting pad is adhered to the liquid cooling plate is adopted. However, the thermal pad can only have a certain deformation margin, and a larger thickness is required if the thermal pad is in reliable interference fit with the side surface of the battery and the thermal pad, but the volume of the battery module is increased to reduce the energy density. If the heat conduction pad is thinner in order to improve the space utilization rate of the battery module, the interference filling fit degree with the liquid cooling plate and the battery module is not high, and the conduction efficiency is still poor. And, the long-term use ageing that can exist between heat conduction pad and the liquid cooling board leads to heat conduction pad and the viscidity of liquid cooling board to drop, and the heat conduction efficiency of heat conduction pad is sharply reduced this moment, and battery module radiating efficiency is poor, and battery thermal runaway risk is high.

The application adopts the heat-conducting glue, is fluid and can solidify after cooling, can reliably fill the liquid cooling plate and the side surface of the battery module during fluid, and has higher binding force with the side surface of the battery module and the surface of the liquid cooling plate after cooling and solidifying. However, a certain safety gap is required to be arranged between the liquid cooling plate and the battery module, and when the heat conducting glue is filled in a fluid state, the heat conducting glue leaks from the gap to the bottom surface of the box body, so that the pollution to the environment of the battery is brought, heat conduction is formed between the battery and the box body, the internal environment temperature of the battery is easy to be interfered by the external environment, and the stability and the safety of the battery are reduced. In addition, the spacing fixed difficulty of being difficult to when vertical assembly in clearance between two battery module is big.

Referring to fig. 3-7 together, fig. 3 is a schematic structural diagram of an energy storage device according to an embodiment of the application. Fig. 4 is an exploded view of an energy storage device according to an embodiment of the present application. Fig. 5 is a schematic structural diagram of a liquid cooling module according to an embodiment of the application. Fig. 6 is an exploded view of a liquid cooling plate according to an embodiment of the present application. Fig. 7 is a schematic structural view of an elastic support according to an embodiment of the application. Note that the heat conductive paste is not illustrated in the drawings.

The application provides an energy storage device 2 and an energy storage system 1. An elastic bracket 32 is provided between the liquid cooling plate 31 and the battery module 21. The elastic support 32, the liquid cooling plate 31 and the battery module 21 are surrounded to form a containing space 323 with an opening and capable of containing heat conducting glue, and the heat conducting glue is used for conducting heat in the battery module 21 into the liquid cooling plate 31, so that heat transfer efficiency is improved, and the cooling effect of the liquid cooling plate 31 on the battery module 21 is improved.

The application provides an energy storage device 2, which comprises at least two battery modules 21 and a liquid cooling module 3. The liquid cooling module 3 is configured to be installed between two adjacent battery modules 21. The liquid cooling module 3 includes a liquid cooling plate 31, an elastic support 32, and a heat conductive adhesive. The liquid cooling plate 31 has a cold plate channel 3112, and the Leng Banliu channel 3112 is used for accommodating cooling liquid. An elastic support 32, which is sandwiched between the liquid cooling plate 31 and the battery module 21, wherein a side of the elastic support 32 facing away from the liquid cooling plate 31 is in press fit with the battery module 21, and a side of the elastic support 32 facing the battery module 21 is in press fit with the liquid cooling plate 31; the elastic support 32 includes two first elastic support bars 321 disposed at intervals along the length direction of the liquid cooling plate 31, and a second elastic support bar 322 extending along the length direction of the liquid cooling plate 31, wherein the second elastic support bars 322 are connected to the same side of the two first elastic support bars 321; the two first elastic support bars 321, the second elastic support bars 322, the liquid cooling plate 31, and the battery module 21 enclose a receiving space 323 having an opening. The heat-conducting glue is disposed in the accommodating space 323.

Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. The terms first, second and the like in the description and in the claims and in the above-described figures are used for distinguishing between different objects and not necessarily for describing a sequential or chronological order.

Since the liquid cooling plate 31 is a member having a three-dimensional structure of a predetermined size, the liquid cooling plate 31 has a longitudinal direction, a width direction, and a height direction. The longitudinal direction is understood as the X direction in the drawing, and the longitudinal direction X is also understood as the direction from one end of the liquid cooling plate 31 to the other end of the liquid cooling plate 31. The length direction of the liquid cooling plate 31 is the same as the arrangement direction of the plurality of unit cells 211 in the battery module 21. The width direction is understood as the Y direction in the drawing, and the width direction Y is also understood as the arrangement direction of the elastic support 32 and the liquid cooling plate 31. The height direction may be understood as the Z direction in the drawing, and the height direction Z may be understood as a direction perpendicular to one end of the liquid cooling plate 31 to the other end of the liquid cooling plate 31. The height direction of the liquid cooling plate 31 is the same as the extending direction of the first elastic support bar 321.

Other members such as the elastic holder 32 and the battery module 21 also have the longitudinal direction X, the width direction Y, and the height direction Z. The length direction X, the width direction Y, and the height direction Z of the elastic support 32 can be understood in the same manner as the length direction X, the width direction Y, and the height direction Z, and the description of this embodiment is omitted herein.

The liquid cooling module 3 provided in this embodiment includes a liquid cooling plate 31 for cooling the battery module 21. The liquid cooling plate 31 includes two substrates 311 connected to each other, and a liquid guide groove 3111 is provided on an inner side surface of each substrate 311, and a cold plate flow passage 3112 is formed between the two liquid guide grooves 3111. Alternatively, the liquid guide groove 3111 is a U-shaped groove, and the cooling liquid flows in from one end of the liquid guide groove 3111 and flows out from the other end of the liquid guide groove 3111. The outer side surface of each substrate 311 is provided with a protrusion 3113 corresponding to the liquid guide groove 3111. Alternatively, the protrusion 3113 is U-shaped in shape. The protruding portion 3113 can enhance the structural strength of the liquid cooling plate 31. Alternatively, the side of the elastic support 32 facing the liquid cooling plate 31 is provided with a relief groove for accommodating the protruding portion 3113 of the portion.

The battery module 21 includes a plurality of unit cells 211 arranged along the length direction of the liquid cooling plate 31. The battery module 21 includes a surface 22 to be cooled. The surface 22 to be cooled is formed by arranging side plates of a plurality of single batteries 211. The liquid cooling module 3 is disposed between the surfaces 22 to be cooled of the two battery modules 21. It is also understood that the liquid cooling module 3 is provided on one side where the plurality of unit cells 211 are arranged. The unit cell 211 includes an end cap assembly, a case, a switching sheet, an electrode assembly, an electrolyte, and the like. The end cover component is connected with the shell, the electrode component is contained in the shell, and the opposite ends of the switching sheet are respectively and electrically connected with the electrode component and the polar post of the end cover component. The electrolyte is used to wet the electrode assembly. The electrode assembly includes a cell.

The liquid cooling module 3 provided in this embodiment further includes an elastic bracket 32. One side of the elastic support 32 is connected with the liquid cooling plate 31, and the other side is connected with the battery module 21. For example, the elastic support 32 may be connected to the liquid cooling plate 31 and the battery module 21 by means of clamping or bonding. For example, an elastic support 32 is provided on one side of the liquid cooling plate 31. For another example, two elastic supports 32 are respectively disposed on opposite sides of the liquid cooling plate 31. The elastic support 32 is composed of two first elastic support bars 321 and one second elastic support bar 322. The length direction of the liquid cooling plate 31 is the same as the arrangement direction of the plurality of unit cells 211 in the battery module 21. One end of the two first elastic support strips 321 far away from the second elastic support 32 forms an opening, and the opening is communicated with the accommodating space 323. The heat-conducting glue can enter the accommodating space 323 through the opening. Optionally, the first elastic support bar 321 is flush with the surface of the second elastic support bar 322 facing away from the liquid cooling plate 31. The arrangement is such that the surface of the elastic support 32 facing away from the liquid cooling plate 31 can be smoothly provided on the side wall of the battery module 21. Optionally, the elastic support 32 has elasticity. For example, the material of the elastic support 32 includes rubber.

Alternatively, the battery module 21 includes a plurality of unit cells 211 arranged along the length direction of the liquid cooling plate 31, each unit cell 211 includes a battery cell, and the plurality of battery cells form a battery cell group; the length of the elastic support 32 is greater than or equal to the length of the battery cell group along the length direction of the liquid cooling plate 31; the height of the elastic support 32 is greater than or equal to the height of the battery cell group along the height direction of the liquid cooling plate 31. Through the length and the height that prescribe a limit to elastic support 32 to ensure that elastic support 32 homoenergetic covers every electric core, ensure that the heat of more electric cores can be through the heat conduction glue transfer to liquid cooling plate 31 in the accommodation space 323, thereby improve thermal transfer effect, and then improve the cooling effect of liquid cooling plate 31 to battery module 21. The height direction of the liquid cooling plate 31 is the same as the extending direction of the first elastic support bar 321.

The liquid cooling module 3 provided in this embodiment further includes a heat conductive adhesive for conducting heat in the battery module 21 into the liquid cooling plate 31. For example, the heat conductive paste fills the entire accommodation space 323; or, a part of the receiving space 323 is filled. The orthographic projection of the heat-conducting glue in each accommodating space 323 on the battery module 21 covers at least part of the battery cells of the battery module 21.

The method for assembling the liquid cooling module 3 and the battery module 21 is described below, and the battery module 21 is obtained by fixing the unit cells 211 to the fixing plate of the battery case or the battery rack. The liquid cooling module 3 is mounted on one side of a battery module 21, and the liquid cooling plate 31 is pre-limited by a limiting structure of the battery box. Then, the other battery module 21 is again mounted to the other side of the liquid cooling module 3. The battery module 21 is usually fixed to the battery case or the fixing plate by connecting a long bolt to the case bottom plate or the fixing plate of the battery frame through a bolt hole of the end plate. The assembly sequence is performed in the order of the battery module 21, the liquid cooling module 3, and the battery module 21. Finally, the thermal conductive glue is filled, and the thermal conductive glue is injected from the opening of the elastic support 32, so that the accommodating space 323 is filled with the thermal conductive glue.

The liquid cooling plate 31 has a cold plate channel 3112 therein, and the cooling liquid can flow through the cold plate channel 3112 to carry heat away from the liquid cooling plate 31. The elastic support 32 is sandwiched between the liquid cooling plate 31 and the battery module 21. The elastic support 32 strips of the elastic support 32, the liquid cooling plate 31 and the battery module 21 are surrounded to form a containing space 323 capable of containing heat conducting glue, and the heat conducting glue is used for conducting heat in the battery module 21 into the liquid cooling plate 31, so that heat transfer efficiency is improved, and the cooling effect of the liquid cooling plate 31 on the battery module 21 is improved. In addition, the elastic support 32 defines a receiving space 323 filled with heat conductive adhesive, and can prevent adhesive overflow.

And, each elastic support 32 comprises two first elastic support strips 321 and a second elastic support strip 322, also can understand elastic support 32 as U-shaped elastic support 32, and the accommodation space 323 that elastic support 32 encloses is the U-shaped space, and the thermal-conducting glue of not only being convenient for pour into from the opening in U-shaped space has reduced the operation degree of difficulty.

Therefore, in the energy storage device 2 according to the present embodiment, the elastic support 32 is disposed on the side of the liquid cooling plate 31 facing the battery module 21, and the elastic support 32, the liquid cooling plate 31, and the battery module 21 are surrounded to form the accommodating space 323 capable of accommodating the heat-conducting glue. Heat in the battery module 21 is conducted into the liquid cooling plate 31 by utilizing the heat conducting glue, so that the heat transfer efficiency is improved, and the cooling effect of the liquid cooling plate 31 on the battery module 21 is improved.

Referring to fig. 3-8 together, fig. 8 is an enlarged view of fig. 5. In one embodiment, the liquid cooling plate 31 includes a first plate body 311a and a second plate body 311b disposed opposite to each other in the width direction of the liquid cooling plate 31, the first plate body 311a includes a first runner 3118a and a first connection portion 3119a surrounding the periphery of the first runner 3118a, the first runner 3118a protrudes from the first connection portion 3119a, the second plate body 311b includes a second runner 3118b and a second connection portion 3119b surrounding the periphery of the second runner 3118b, the second runner 3118b protrudes from the second connection portion 3119b, the first connection portion 3119a and the second connection portion 3119b are fixedly connected, the Leng Banliu runner 3112 is formed between the first runner 3118a and the second runner 3118b, and the outer surfaces of the first runner 3118a and the second runner 3118b include two side surfaces disposed opposite to each other in the height direction of the liquid cooling plate 31 and between the two opposite end surfaces.

The side surface is concavely provided with at least one exhaust passage 3116 extending along the height direction of the liquid cooling plate 31, the exhaust passage 3116 penetrates through the two end surfaces, and the exhaust passage 3116 is communicated with the accommodating space 323 and with an opening of the accommodating space.

The two substrates 311 are a first plate 311a and a second plate 311b. The first channel 3118a and the second channel 3118b each include a liquid guide slot 3111 and a protrusion 3113. The liquid cooling plate 31 according to the present embodiment is provided with the exhaust duct 3116 for smoothly exhausting air in the gap between the liquid cooling plate 31 and the battery module 21 when the heat conductive adhesive is filled. Alternatively, part of the exhaust passage 3116 is concavely provided on the protrusion 3113 of the base plate 311, penetrating the top, side, and bottom surfaces of the protrusion 3113. Alternatively, in the height direction of the liquid cooling plate 31, the height of the exhaust channel 3116 is smaller than or equal to the height of the first elastic support bar 321, so that more heat-conducting glue can be accommodated, and heat dissipation efficiency is improved. The liquid cooling plate 31 has a plurality of exhaust ports 3116, and the plurality of exhaust ports 3116 are arranged at intervals along the longitudinal direction of the liquid cooling plate 31. The exhaust passage 3116 is used for exhausting the gas in the accommodating space 323 through the exhaust passage 3116 when the heat-conducting glue is injected, and is also used for accommodating the heat-conducting glue.

When injecting the heat-conducting glue, the heat-conducting glue in liquid state is usually injected at any selected position, and preferably, in order to improve the uniformity of glue filling, the middle position of the liquid cooling plate 31 is usually selected for injection. In addition, if the heat-conducting glue is filled in a closed space, air is difficult to be discharged in the glue filling process, air bubbles are formed in the heat-conducting glue, and the air bubbles in the solidified heat-conducting glue cause gaps between the heat-conducting glue and the liquid cooling plate 31 or the battery module 21, so that the heat conduction area of the heat-conducting glue is affected, and the heat dissipation of the battery module 21 is negatively affected.

Glue is injected from the runner part position outside the exhaust passage 3116, because the exhaust passage 3116 is communicated with the opening of the accommodating space 323, the exhaust passage 3116 can discharge air in the accommodating space 323 during glue injection, and the amount of the injected heat conducting glue gradually increases, so that the heat conducting glue gradually fills the accommodating space 323 and the exhaust passage 3116 until the whole accommodating space 323 and the exhaust passage 3116 are filled, namely, the heat conducting glue is filled between the liquid cooling plate 31 and the battery module 21, and the exhaust passage 3116 is concavely formed to be capable of filling a conduction area which ensures reliable heat conducting glue and the liquid cooling plate 31 as well as the battery module 21.

In this embodiment, the exhaust passage 3116 is communicated with the accommodating space 323, so that when the heat-conducting glue is filled, the glue can be injected into the accommodating space 323, and the air in the accommodating space 323 is discharged through the exhaust passage 3116, so that air trapping is avoided, the probability that the heat conduction efficiency is reduced due to the fact that air bubbles are generated in the accommodating space 323 when the heat-conducting glue is injected is reduced, the air bubbles are reduced, the heat conduction efficiency of the heat-conducting glue is improved, and the cooling effect of the liquid cooling plate 31 on the battery module 21 is improved.

Referring to fig. 3-8, in one embodiment, the exhaust passage 3116 includes a first side wall 3116a and a second side wall 3116b disposed at intervals along a length direction of the liquid cooling plate 31, and a plurality of grooves 3114 disposed at intervals are concavely disposed on the first side wall 3116a and the second side wall 3116b, respectively, and the grooves of the first side wall 3116a are disposed opposite to the grooves of the second side wall 3116 b.

The liquid cooling plate 31 provided in this embodiment is also provided with grooves 3114. For example, the groove 3114 communicates with the accommodation space 323. For another example, the recess 3114 is not directly connected to the receiving space 323, but indirectly connected to the receiving space 323 via the exhaust passage 3116. The plurality of grooves 3114 are arranged at intervals in the height direction of the liquid cooling plate 31. The height direction of the liquid cooling plate 31 is the same as the extending direction of the first elastic support bar 321. The combination of the grooves 3114 and the exhaust channels 3116 may form a gourd-shaped channel structure.

The outer side surface of the base plate 311 of the liquid cooling plate 31 is provided with a plurality of grooves 3114. Optionally, a plurality of grooves 3114 are recessed in the top surface of the protrusion 3113. The inner surface of the substrate 311 of the liquid cooling plate 31 is provided with a plurality of protrusions 3115 corresponding to the grooves 3114. Alternatively, the plurality of protruding blocks 3115 are protruding on the bottom surface of the liquid guiding groove 3111. On the other hand, the grooves 3114 can improve the structural strength of the substrate 311, thereby improving the structural strength of the liquid cooling plate 31 and prolonging the service life of the liquid cooling module 3. The recess 3114 and the corresponding bump 3115 can further improve the structural strength of the substrate 311. On the other hand, when the projection 3115 is provided on the bottom surface of the liquid guide groove 3111, the projection 3115 can maintain the flow parameter of the cooling liquid in the cold plate channel 3112 in a continuously variable state. For example, the flow speed, the flow direction, and the like of the cooling liquid are changed, thereby improving the cooling effect of the liquid cooling plate 31 on the battery module 21.

In this embodiment, by providing the grooves 3114 on the first side wall 3116a and the second side wall 3116b of the exhaust channel 3116, the volume of the exhaust channel 3116 can be increased, the exhaust efficiency during glue injection can be improved, more gas can be exhausted through the exhaust channel 3116, trapping gas is further avoided, the probability of reducing the heat conduction efficiency due to bubbles generated in the accommodating space 323 during glue injection is further reduced, the bubble generation is further reduced, the heat conduction efficiency of the glue is further improved, and the cooling effect of the liquid cooling plate 31 on the battery module 21 is further improved.

The grooves of the first side wall 3116a and the second side wall 3116b are disposed opposite to each other, so that stress uniformity of the first plate 311a and the second plate 311b can be improved, and structural strength of the first plate 311a and the second plate 311b can be further improved. In addition, in order to increase the glue injection rate, the glue may be injected through a plurality of openings at the same time, and the glue injection position is selected as a position between the two exhaust channels 3116 and a central position. The flow channel surfaces with different characteristics can influence the flowing speed of the heat conducting glue, and when the heat conducting glue with different speeds is converged at a certain node, bubbles are easy to generate due to different speeds when the flow speed is high and the flow speed is low. In order to reduce the probability of generating bubbles, the grooves of the first side wall 3116a and the grooves of the second side wall 3116b are opposite, and the flow channels are the same at this time, so that the generation of bubbles can be further reduced, the probability of trapping bubbles can be further reduced, and the heat conduction efficiency of the heat conducting adhesive can be further improved.

Referring to fig. 3-9 together, fig. 9 is a cross-sectional view of a liquid cooling plate according to an embodiment of the application. In one embodiment, the exhaust channels 3116 of the first plate 311a are staggered with the exhaust channels 3116 of the second plate 311 b; along the width direction of the liquid cooling plate 31, the vertical distance between the air vent 3116 of the first plate 311a and the second plate 311b is d1, the vertical distance between the air vent 3116 of the second plate 311b and the first plate 311a is d1, and the maximum vertical distance between the first plate 311a and the second plate 311b is d2, wherein d1/d2 is greater than or equal to 1/d2 and less than or equal to 3/4.

Since the concave exhaust passage 3116 is provided to reduce the width between the first flow path portion 3118a and the second flow path portion 3118b, that is, the width of the cold plate flow path 3112, the flow rate is affected, and the exhaust passage 3116 of the first plate body 311a and the exhaust passage 3116 of the second plate body 311b are offset, the influence on the width of the cold plate flow path 3112 can be reduced. In addition, the exhaust passage 3116 is arranged in a staggered manner, so that the inner sides of the first channel portion 3118a and the second channel portion 3118b form staggered protrusions, and a cold plate channel 3112 with stepwise and continuous variation is formed, so that the flow rate of the cooling liquid is changed and improved due to the influence of the change of the size of the channel, the flow rate and the flow velocity are balanced better, and the cooling efficiency of the cooling liquid in the liquid cooling plate 31 is ensured while the glue filling and the air exhausting are solved.

The portion of the cold plate channel 3112 facing the exhaust duct 3116 has a width d1, and the portion of the cold plate channel 3112 not facing the exhaust duct 3116 has a width d2, where 1/2.ltoreq.d1/d2.ltoreq.3/4. d1 can also be understood as the width of the liquid cooling plate 31 in the position of the exhaust passage 3116; d2 can also be understood as the width dimension of the liquid cooling plate 31 in the normal flow path position without the exhaust passage 3116.

When the liquid cooling plate 31 satisfies 1/2 d1/d2 is less than or equal to 3/4, the exhaust passage 3116 can realize rapid exhaust when the heat-conducting glue is injected, and the liquid cooling plate 31 can be ensured to have a higher cooling effect. If d1/d2 of the liquid cooling plate 31 is less than 1/2, the increase in the flow rate of the cooling liquid in the cold plate channel 3112 cannot balance the cooling efficiency reduction effect due to the flow reduction, resulting in a reduction in the cooling effect of the liquid cooling plate 31; if d1/d2 of the liquid cooling plate 31 is greater than 3/4, the exhaust passage 3116 is too shallow to facilitate rapid exhaust, increasing the probability of bubble generation, and reducing the heat conduction efficiency of the heat conductive adhesive.

Referring to fig. 3 to 10 together, fig. 10 is a schematic structural diagram of a liquid cooling module according to another embodiment of the application. In one embodiment, the battery module 21 includes a plurality of unit cells 211 arranged along the length direction of the liquid cooling plate 31, and the orthographic projection of one of the exhaust channels 3116 on the battery module 21 falls within the range of one of the unit cells 211.

One of the exhaust groups is disposed in direct correspondence with one of the unit cells 211. Alternatively, the front projection of the plurality of grooves 3114 on the battery module 21 falls within the range of one unit cell 211.

In this embodiment, by limiting the exhaust passage 3116 to correspond to the unit cells 211 in the battery module 21, when filling the portion of the heat-conducting glue corresponding to the unit cells 211, the generation of bubbles can be reduced, and the generation of heat-conducting dead zones with low heat-conducting efficiency can be reduced, so that the heat-conducting efficiency of the heat-conducting glue to the unit cells 211 can be further improved, and the cooling effect of the liquid cooling plate 31 to the battery module 21 can be further improved.

Referring to fig. 3-7, in one embodiment, the liquid cooling plate 31 includes a first plate body 311a and a second plate body 311b disposed opposite to each other in a width direction of the liquid cooling plate 31, the first plate body 311a includes a first runner portion 3118a and a first connection portion 3119a surrounding a periphery of the first runner portion 3118a, the first runner portion 3118a protrudes from the first connection portion 3119a, the second plate body 311b includes a second runner portion 3118b and a second connection portion 3119b surrounding a periphery of the second runner portion 3118b, the second runner portion 3118b protrudes from the second connection portion 3119b, the first connection portion 3119a is fixedly connected to the second connection portion 3119b, and the Leng Banliu runner 3112 is formed between the first runner portion 3118a and the second runner portion 3118 b.

The first connection portion 3119a and the second connection portion 3119b are provided with protruding columns 3117, the elastic support 32 includes a first surface 324 facing the liquid cooling plate 31 and a second surface 325 facing away from the liquid cooling plate 31, and the elastic support 32 is provided with a through hole 326 penetrating the first surface 324 and the second surface 325 for accommodating at least part of the protruding columns 3117.

The posts 3117 abut the walls of the through holes 326. The plurality of protruding columns 3117 are provided at intervals along the longitudinal direction of the liquid cooling plate 31 and/or at intervals along the height direction of the liquid cooling plate 31. The plurality of posts 3117 and the protruding portions 3113 have a gap therebetween to avoid interference therebetween. The plurality of through holes 326 are disposed on the first elastic support bar 321 and/or the second elastic support bar 322. Alternatively, the width of the boss 3117 gradually decreases in the arrangement direction from the elastic support 32 to the liquid cooling plate 31. Thus, the device is convenient for assembling the elastic support 32, reduces the difficulty of arranging the raised column 3117 in the through hole 326, and enables the raised column 3117 to be matched with the through hole 326 more tightly, so that the elastic support 32 is difficult to fall off.

In the embodiment, the protruding columns 3117 matched with the through holes 326 of the elastic support 32 are arranged on the liquid cooling plate 31, so that the elastic support 32 can be positioned conveniently when being assembled with the liquid cooling plate 31, and the assembly difficulty is reduced; and the contact area of the elastic support 32 and the liquid cooling plate 31 is increased, the connection performance of the elastic support 32 and the liquid cooling plate 31 is improved, and the probability of glue leakage of the heat-conducting glue is reduced.

Referring to fig. 3 to fig. 7 together, in one embodiment, the size of the protruding column 3117 is h1, and the size of the elastic support 32 is h2, and h2 is greater than h1 along the width direction of the liquid cooling plate 31; wherein (h 2-h 1)/h 2 is more than or equal to 1/6 and less than or equal to 1/2.

h1 can be understood as the height of the boss 3117. h2 can be understood as the thickness of the elastic support 32. The thickness of the elastic support 32 refers to the thickness of the elastic support 32 itself before the elastic support 32 is mounted on the liquid cooling plate 31 and the battery module 21. Since the elastic support 32 has elasticity, h2 is greater than h1, it is ensured that the elastic support 32 is in a compressed state after the elastic support 32 is mounted between the liquid cooling plate 31 and the battery module 21, and a certain compression margin is provided.

When the liquid cooling module 3 meets the requirement that (h 2-h 1)/h 2 is less than or equal to 1/6 and less than or equal to 1/2, the elastic support 32 can be tightly in interference fit with the liquid cooling plate 31 and the battery module 21, and the reliability of the energy storage device 2 is improved. If (h 2-h 1)/h 2 of the liquid cooling module 3 is smaller than 1/6, the thickness of the elastic support 32 is too small, the compression deformation space is small, and the elastic support is not in press interference fit with the liquid cooling plate 31 and the battery module 21. The protruding columns 3117 will interfere the deformation of the elastic support 32, so that the elastic support 32 cannot be tightly matched with the liquid cooling plate 31 and the battery module 21; if (h 2-h 1)/h 2 of the liquid cooling module 3 is greater than 1/2, the thickness of the elastic support 32 is too large, and the height of the protruding column 3117 is too short, so that the protruding column 3117 cannot perform the function of limiting and fixing, and the elastic support 32 is easy to drop from the liquid cooling plate 31.

Referring to fig. 3-12 together, fig. 11 is a schematic structural diagram of two adjacent unit cells according to an embodiment of the application. Fig. 12 is a bottom view of fig. 11. In one embodiment, the plurality of posts 3117 includes a first post 3117a for positioning within the through-hole 326 of the first resilient bracket strip 321, and a second post 3117b for positioning within the through-hole 326 of the second resilient bracket strip 322; the battery module 21 includes a plurality of unit cells 211 arranged along the length direction of the liquid cooling plate 31, and the orthographic projection of the second protruding column 3117b on the battery module 21 falls into a gap between two adjacent unit cells 211.

The plurality of unit cells 211 are arranged along the longitudinal direction of the liquid cooling plate 31. For example, the plurality of unit cells 211 are arranged at intervals, and an adhesive plate is provided between two adjacent unit cells 211. For another example, two adjacent unit cells 211 are abutted against each other. One side of the unit cell 211 facing the liquid cooling plate 31 has two R angles 2213. The R angle 2213 of one elastic support 32 has a gap with the R angle 2213 of an adjacent elastic support 32. The R angle 2213 may also be understood as a chamfer at the junction of the first side plate 2211 and the second side plate 2212.

The gap between two adjacent unit cells 211 may be a gap between two adjacent unit cells 211 disposed at intervals, including a width of the adhesive plate. The gap between two adjacent unit cells 211 may be a gap between R angles 2213 of two adjacent unit cells 211.

The plurality of first bosses 3117a are provided at intervals in the height direction of the liquid cooling plate 31. The plurality of second bosses 3117b are provided at intervals along the longitudinal direction of the liquid cooling plate 31. The second boss 3117b is just corresponding to the gap between two adjacent unit cells 211. It will be appreciated that at least a portion of the second posts 3117b are disposed between two adjacent cells 211. In this embodiment, the second protruding columns 3117b on the second elastic support 32 are just corresponding to the gaps between two adjacent unit cells 211, so as to improve the connection performance between the liquid cooling plate 31 and the elastic support 32 just corresponding to the gaps between the two adjacent unit cells 211, and reduce the probability of leaking the heat-conducting glue from the accommodating space 323.

Referring to fig. 3-16 together, fig. 13 is a schematic structural view of an elastic support according to another embodiment of the application. Fig. 14 is a bottom view of a liquid cooling module according to an embodiment of the application. Fig. 15 is a bottom view of a liquid cooling module according to another embodiment of the application. Fig. 16 is a partial enlarged view of fig. 15.

In one embodiment, the battery module 21 includes a plurality of unit batteries 211 arranged at intervals along the length direction of the liquid cooling plate 31, and a protrusion 327 is protruding on a side of the second elastic support bar 322 facing the battery module 21, where the protrusion 327 is disposed in a gap between two adjacent unit batteries 211 and is in interference fit with two adjacent unit batteries 211.

The protrusion 327 abuts against the side wall of the unit cell 211. When an adhesive plate is disposed between two adjacent unit batteries 211, the protrusion 327 abuts against the adhesive plate. The protrusion 327 may be abutted against and fixed to the unit cell 211 by a snap-fit or adhesive manner. According to the embodiment, the protrusions 327 are arranged on the second elastic support strips 322 and are abutted against the single batteries 211, so that each elastic support 32 can cover the side wall of the battery cell to the greatest extent, the accommodating space 323 is sealed, glue overflow at the bottom of the elastic support 32 is prevented, the probability that heat conducting glue leaks from the accommodating space 323 is reduced, and the heat transfer efficiency is further improved.

Referring to fig. 3-16, in one embodiment, each of the single cells 211 includes a first side plate 2211 facing the liquid cooling plate 31, and a second side plate 2212 facing the adjacent single cell 211, where a connection between the first side plate 2211 and the second side plate 2212 forms an R angle 2213; the protrusion 327 is disposed in a gap between the R-angle 2213 of one unit cell 211 and the R-angle 2213 of the adjacent unit cell 211, and the shape of the protrusion 327 is adapted to the adjacent R-angles 2213.

One side of the unit cell 211 facing the liquid cooling plate 31 has two R angles 2213. The R angle 2213 of one elastic support 32 has a gap with the R angle 2213 of an adjacent elastic support 32. The R angle 2213 may also be understood as a chamfer at the junction of the first side plate 2211 and the second side plate 2212. The shape of the protrusion 327 is adapted to the adjacent R-angle 2213, and it is also understood that the shape of the protrusion 327 is triangular-like.

In this embodiment, the shape of the protrusion 327 is adapted to two adjacent R angles 2213, and the protrusion 327 is tightly abutted to two adjacent R angles 2213, so as to improve the connection performance between the protrusion 327 and the single battery 211, and adapt to the shell profile of the single battery 211, so as to further improve the sealing performance of the accommodating space 323, further prevent the bottom of the elastic support 32 from overflowing, and further reduce the probability of glue leakage in the accommodating space 323.

Referring to fig. 1 to 16, the present application further provides an energy storage device 2, where the energy storage device 2 includes two battery modules 21 and the liquid cooling module 3 provided by the present application, and the liquid cooling module 3 is installed between the two battery modules 21.

Alternatively, the energy storage device 2 may be, but is not limited to being, a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like.

In the energy storage device 2 according to the present embodiment, the liquid cooling module 3 according to the present application is used, and the elastic support 32 is provided on the side of the liquid cooling plate 31 facing the battery module 21, so that the elastic support 32, the liquid cooling plate 31, and the battery module 21 are surrounded to form the accommodating space 323 in which the heat conductive adhesive can be accommodated. Heat in the battery module 21 is conducted into the liquid cooling plate 31 by utilizing the heat conducting glue, so that the heat transfer efficiency is improved, and the cooling effect of the liquid cooling plate 31 on the battery module 21 is improved.

Referring to fig. 1 to 16, the present application further provides an energy storage system 1, where the energy storage system 1 includes a user load 11, an electric energy conversion device 12, and an energy storage device 2 provided as described above. The electric energy conversion device 12 is used for converting other forms of energy sources into electric energy, the electric energy conversion device 12 is electrically connected with the user load 11, and the electric energy converted by the electric energy conversion device 12 supplies power to the user load 11. The energy storage device 2 is electrically connected with the user load 11 and the electric energy conversion device 12 respectively, the energy storage device 2 stores the electric energy converted by the electric energy conversion device 12, and the energy storage device 2 supplies power to the user load 11.

Optionally, the user load 11 of the embodiment of the present application may be, but is not limited to, a portable electronic device such as a mobile phone, a tablet computer, a notebook computer, a desktop computer, a smart toy, a smart bracelet, a smart watch, an electronic reader, a game console, a toy, etc.; the device can also be large-scale equipment such as an energy storage battery cabinet, a battery car, an electric car, a ship, a spacecraft and the like.

It should be understood that the user load 11 described in this embodiment is only one form of the user load 11 to which the energy storage device 2 is applied, and should not be construed as limiting the user load 11 provided by the present application, nor should it be construed as limiting the energy storage device 2 provided by the various embodiments of the present application.

In the energy storage system 1 according to the present embodiment, by adopting the energy storage device 2 provided by the present application, the elastic support 32 is disposed on the side of the liquid cooling plate 31 facing the battery module 21, and the elastic support 32, the liquid cooling plate 31, and the battery module 21 are surrounded to form the accommodating space 323 capable of accommodating the heat-conducting glue. Heat in the battery module 21 is conducted into the liquid cooling plate 31 by utilizing the heat conducting glue, so that the heat transfer efficiency is improved, and the cooling effect of the liquid cooling plate 31 on the battery module 21 is improved. When the energy storage device 2 supplies power to the user load 11, the energy storage device 2 can provide a stable power supply to the user load 11.

The foregoing has outlined rather broadly the more detailed description of embodiments of the application in order that the principles and embodiments of the application may be better understood, and in order that the present application may be better understood; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present application, the present description should not be construed as limiting the present application in view of the above.

Claims

1. An energy storage device, comprising:

at least two battery modules;

And the heat-conducting glue is arranged in the accommodating space.

2. The energy storage device as defined in claim 1, wherein the liquid cooling plate comprises a first plate body and a second plate body which are arranged opposite to each other along the width direction of the liquid cooling plate, the first plate body comprises a first runner part and a first connecting part surrounding the periphery of the first runner part, the first runner part protrudes from the first connecting part, the second plate body comprises a second runner part and a second connecting part surrounding the periphery of the second runner part, the second runner part protrudes from the second connecting part, the first connecting part is fixedly connected with the second connecting part, the cold plate runner is formed between the first runner part and the second runner part, and the outer surfaces of the first runner part and the second runner part both comprise two end surfaces which are arranged opposite to each other along the height direction of the liquid cooling plate and side surfaces which are bent and connected between the two end surfaces;

3. The energy storage device of claim 2, wherein the exhaust passage comprises a first side wall and a second side wall which are arranged at intervals along the length direction of the liquid cooling plate, a plurality of grooves which are arranged at intervals are respectively concavely arranged on the first side wall and the second side wall, and the grooves of the first side wall are arranged opposite to the grooves of the second side wall.

4. The energy storage device of claim 2, wherein said exhaust channels of said first plate are staggered with said exhaust channels of said second plate; along the width direction of the liquid cooling plate, the vertical distance between the exhaust passage of the first plate body and the second plate body is d1, the vertical distance between the exhaust passage of the second plate body and the first plate body is d1, and the maximum vertical distance between the first plate body and the second plate body is d2, wherein d1/d2 is more than or equal to 1/2 and less than or equal to 3/4.

5. The energy storage device of claim 2, wherein said battery module includes a plurality of cells arranged along a length of said liquid cooling plate, and an orthographic projection of one of said air vents on said battery module falls within a range of one of said cells.

6. The energy storage device as defined in claim 1, wherein the liquid cooling plate comprises a first plate body and a second plate body which are arranged opposite to each other in a width direction of the liquid cooling plate, the first plate body comprises a first runner part and a first connecting part surrounding a periphery of the first runner part, the first runner part protrudes from the first connecting part, the second plate body comprises a second runner part and a second connecting part surrounding a periphery of the second runner part, the second runner part protrudes from the second connecting part, the first connecting part is fixedly connected with the second connecting part, and the cold plate runner is formed between the first runner part and the second runner part;

7. The energy storage device as defined in claim 6, wherein the dimension of said projection along the width direction of said liquid cooling plate is h1, the dimension of said elastic support is h2, and h2 is greater than h1; wherein (h 2-h 1)/h 2 is more than or equal to 1/6 and less than or equal to 1/2.

8. The energy storage device of claim 6, wherein a plurality of said posts include a first post for locating within said through hole of said first resilient bracket strip and a second post for locating within said through hole of said second resilient bracket strip; the battery module comprises a plurality of single batteries which are arranged along the length direction of the liquid cooling plate, and the orthographic projection of the second convex column of the battery module falls into a gap between two adjacent single batteries.

9. The energy storage device of claim 1, wherein the battery module comprises a plurality of single batteries arranged at intervals along the length direction of the liquid cooling plate, a protrusion is convexly arranged on one side of the second elastic support strip facing the battery module, and the protrusion is arranged in a gap between two adjacent single batteries and is in interference fit with the two adjacent single batteries.

10. The energy storage device of claim 9, wherein each of said cells includes a first side plate facing said liquid cooling plate and a second side plate facing an adjacent cell, said first side plate and said second side plate forming an R-angle at their junction; the protrusions are arranged in gaps between the R angle of one single battery and the R angles of the adjacent single batteries, and the shapes of the protrusions are matched with the adjacent two R angles.

11. An energy storage system, the energy storage system comprising:

user load;

The energy storage device of any one of claims 1-10, electrically connected to the consumer load and the power conversion device, respectively, the energy storage device storing power converted by the power conversion device, the energy storage device powering the consumer load.