Liquid cooling plate, energy storage device and energy storage system

Abstract

The utility model discloses a liquid cooling plate, an energy storage device and an energy storage system, and relates to the technical field of battery cooling. The liquid cooling plate comprises a cooling plate body which comprises a first side plate and a second side plate which are oppositely arranged, and a liquid cooling cavity is formed between the first side plate and the second side plate; and the multiple elastic pieces are located in the liquid cooling cavity, each elastic piece is connected with the first side plate and the second side plate, the multiple elastic pieces are distributed in the width direction of the cold plate body at intervals, and the elastic modulus of the multiple elastic pieces in the thickness direction of the cold plate body is gradually increased from the middle position of the cold plate body in the width direction to the edge positions of the two sides.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery cooling, in particular to a liquid cooling plate, an energy storage device and an energy storage system. BACKGROUND

[0002] A secondary battery, also known as a rechargeable battery or a storage battery, refers to a battery that can be activated by charging after discharging to continue to be used. The recyclable nature of the secondary battery makes it gradually become the main power source of electrical equipment. As the demand for secondary batteries gradually increases, people's requirements for their performance in all aspects are also becoming higher and higher.

[0003] Currently, the development direction of secondary batteries is to move towards higher energy density, longer cycle life, lighter and thinner, safer and other fields, that is, it is required that the assembled secondary battery has greater capacity to support the operation of the product for a longer time, and at the same time, it needs to meet the larger charging current to shorten the charging time. Whether it is a series-parallel combination of secondary batteries or a large-rate charging and discharging of secondary batteries, it will lead to an intensified heat dissipation problem, which in turn will cause the instability of the electrochemical system when the temperature is too high, resulting in safety problems.

[0004] In related technologies, most secondary batteries use a bottom liquid cooling cooling method, that is, a liquid cooling plate is arranged at the bottom of the secondary battery to realize cooling of the secondary battery through heat exchange between the cold fluid in the liquid cooling plate and the bottom of the secondary battery. However, the bottom liquid cooling method will inevitably cause a certain temperature difference between the top and bottom of the secondary battery, which will also affect the energy efficiency and life of the secondary battery. CONTENT OF THE INVENTION

[0005] One of the main purposes of the present application is to provide a liquid cooling plate, an energy storage device and an energy storage system that improve the cooling effect of the battery monomer.

[0006] To achieve the above application purposes, the present application adopts the following technical solutions:

[0007] According to one aspect of the present application, a liquid cooling plate is provided, comprising: a cold plate body comprising a first side plate and a second side plate arranged opposite to each other, a liquid cooling cavity being formed between the first side plate and the second side plate; a plurality of elastic members located in the liquid cooling cavity, and each of the elastic members is connected with the first side plate and the second side plate, the plurality of elastic members are distributed along the width direction of the cold plate body, and the elastic modulus of the plurality of elastic members in the thickness direction of the cold plate body increases from the middle position to the edge position in the width direction of the cold plate body.

[0008] In the embodiment of the present application, the elastic member arranged between the first side plate and the second side plate realizes the compressible deformation characteristics of the liquid cooling plate in the thickness direction, thereby reserving the expansion space of the battery monomer based on the compression deformation of the liquid cooling plate in the thickness direction when the liquid cooling plate is located between the two battery monomers; at the same time, the elastic modulus of the elastic member is increased from the middle position to the edge position in the width direction of the cooling plate body, thereby ensuring the synchronous deformation of the first side plate and the second side plate when the battery monomer expands and deforms, that is, ensuring the effective contact of the battery monomer with the liquid cooling plate after expansion, and ensuring the cooling effect of the liquid cooling plate on the battery monomer.

[0009] According to an embodiment of the present application, each of the elastic members is a structure bent multiple times in the thickness direction of the cooling plate body.

[0010] In the embodiment of the present application, the compression of the elastic member can be realized based on the reduction of the opening degree between the adjacent two bending segments, and the recovery of the elastic member can be realized based on the increase of the opening degree between the adjacent two bending segments; in addition, through the multiple bending structure, it is convenient to ensure that the elastic member has a large compression deformation amount.

[0011] According to an embodiment of the present application, for the plurality of elastic members distributed along the width direction of the cooling plate body, the plurality of elastic members have cross sections perpendicular to the thickness direction of the cooling plate body and the same contour shape, and the cross-sectional areas of the plurality of elastic members are increased from the middle position to the edge position in the width direction of the cooling plate body.

[0012] According to an embodiment of the present application, for the plurality of elastic members distributed along the width direction of the cooling plate body, the number of bending of the plurality of elastic members is decreased from the middle position to the edge position in the width direction of the cooling plate body.

[0013] According to an embodiment of the present application, each of the elastic members is a circular arc structure, and two opening sides of the elastic member are connected with the first side plate and the second side plate, respectively; for the plurality of elastic members distributed along the width direction of the cooling plate body, the curvatures of the circular arcs on the plurality of elastic members are increased from the middle position to the edge position in the width direction of the cooling plate body.

[0014] In the embodiment of the present application, the elastic member with the circular arc structure is arranged, which is convenient to simplify the structure of the elastic member and improve the manufacturing efficiency of the liquid cooling plate while ensuring the compressibility of the liquid cooling plate in the thickness direction.

[0015] According to an embodiment of the present application, the plurality of elastic members separate the liquid cooling cavity into a plurality of liquid cooling flow channels; the plurality of liquid cooling flow channels are distributed along the width direction of the cold plate body, and each extends along the length direction of the cold plate body; and the end portions of the plurality of liquid cooling flow channels are sequentially communicated.

[0016] According to an embodiment of the present application, at least one of the first side plate and the second side plate has a strip-shaped protrusion; the length direction of the protrusion is perpendicular to the width direction of the cold plate body, and the protrusion separates the liquid cooling cavity into a plurality of liquid cooling flow channels; the plurality of liquid cooling flow channels each have the elastic member; the plurality of liquid cooling flow channels are distributed along the width direction of the cold plate body, and each extends along the length direction of the cold plate body; and the end portions of the plurality of liquid cooling flow channels are sequentially communicated.

[0017] In the embodiment of the present application, the elastic member is located in the liquid cooling flow channel, so that the elastic member generates turbulence to the cooling fluid in the liquid cooling flow channel, thereby improving the heat exchange effect between the cooling fluid and the battery cell.

[0018] According to an embodiment of the present application, the elastic member is a compression spring.

[0019] In the embodiment of the present application, the elastic member is a compression spring, which facilitates reducing the deformation restriction of the elastic member on the first side plate and the second side plate, so as to improve the synchronization of the deformation of the first side plate and the second side plate when the battery cell expands.

[0020] According to an embodiment of the present application, the material of the elastic member is a memory metal.

[0021] According to an aspect of the present application, a kind of energy storage device is provided, comprising: box base;A plurality of battery cells, the plurality of battery cells are positioned on the box base;The liquid cooling plate of the liquid cooling plate described in the above aspect, the liquid cooling plate is set on the box base, and is located between adjacent battery cells.

[0022] According to an aspect of the present application, a kind of energy storage system is provided, and the energy storage system includes the energy storage device described in the above aspect.

[0023] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0024] The above and other features and advantages of the present application will become more apparent by describing in detail its exemplary embodiments with reference to the attached drawings.

[0025] Figure 1 It is a schematic view of a kind of energy storage system according to an exemplary embodiment.

[0026] Figure 2 is a structural schematic diagram of an energy storage device according to an exemplary embodiment.

[0027] Figure 3 is a structural schematic diagram of a liquid cooling plate according to an exemplary embodiment.

[0028] Figure 4 is a cross-sectional structural schematic diagram of a liquid cooling plate according to an exemplary embodiment.

[0029] Figure 5 is a cross-sectional structural schematic diagram of another liquid cooling plate according to an exemplary embodiment.

[0030] Figure 6 is an axial side exploded structural schematic diagram of another liquid cooling plate according to an exemplary embodiment.

[0031] Figure 7 is a cross-sectional structural schematic diagram of yet another liquid cooling plate according to an exemplary embodiment.

[0032] Figure 8 is an axial side exploded structural schematic diagram of yet another liquid cooling plate according to an exemplary embodiment.

[0033] In the drawings:

[0034] 100, energy storage device; 200, electric energy conversion device; 300, user load;

[0035] 10, box base; 20, battery monomer; 30, binding piece; 40, liquid cooling plate;

[0036] 41, cooling plate body; 42, elastic piece; 43, water inlet joint; 44, water outlet joint;

[0037] 411, first side plate; 412, second side plate; 413, liquid cooling cavity; 414, liquid cooling flow channel; 415, protrusion. DETAILED DESCRIPTION

[0038] Example embodiments now will be described more fully hereinafter with reference to the accompanying drawings; however, the example embodiments can be implemented in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the example embodiments to those skilled in the art. Like reference numerals refer to like elements throughout the figures, and thus description of the same will be simplified or omitted.

[0039] Because the energy people need is highly time- and space-dependent, in order to make rational use of energy and improve its utilization rate, it is necessary to use a medium or device to store one form of energy in the same form or convert it into another form of energy, and then release it in a specific form of energy based on future applications.

[0040] Currently, green energy mainly includes solar energy and wind energy. However, solar energy and wind energy generally suffer from strong intermittency and large fluctuations, which can cause voltage instability in the green power grid (insufficient electricity during peak demand and excessive electricity during off-peak demand). Unstable voltage can damage the power grid, and therefore may lead to the problem of "curtailment of wind and solar power" due to insufficient electricity demand or insufficient grid capacity.

[0041] To solve the problem of insufficient electricity demand or inadequate grid capacity, we must rely on energy storage devices. These devices convert electrical energy into other forms of energy through physical or chemical means and store it. When needed, the stored energy is converted back into electrical energy and released. Simply put, an energy storage device is like a large "power bank," storing electrical energy when solar and wind power are abundant and releasing it when required.

[0042] Current energy storage applications are quite widespread, including generation-side energy storage, grid-side energy storage, renewable energy grid-connected energy storage, and user-side energy storage. The corresponding types of energy storage devices include:

[0043] (1) Large energy storage containers used in grid-side energy storage scenarios can serve as high-quality active and reactive power regulation power sources in the grid, enabling load matching of electrical energy in time and space, enhancing the absorption capacity of renewable energy, and playing a significant role in grid system backup, alleviating peak load power supply pressure, and peak regulation and frequency regulation.

[0044] (2) Small and medium-sized energy storage cabinets used in commercial and industrial energy storage scenarios (banks, shopping malls, etc.) and small household energy storage boxes used in residential energy storage scenarios primarily operate under the "peak shaving and valley filling" mode. Because there are significant price differences in electricity consumption between peak and off-peak periods, users with energy storage devices typically charge them during off-peak hours to reduce costs; during peak hours, they release the stored electricity for use, thus saving on electricity bills. Furthermore, in remote areas and regions prone to natural disasters such as earthquakes and hurricanes, the presence of household energy storage devices effectively provides backup power for users and the power grid, eliminating the inconvenience caused by frequent power outages due to disasters or other reasons.

[0045] The energy storage system provided by the embodiments of the present application comprises an energy storage device to store or supply electric energy.

[0046] Taking an outdoor energy storage scenario in a grid-side energy storage as an example, Figure 1 A schematic diagram of an energy storage system provided by the embodiments of the present application is shown, which comprises an energy storage device 100, an electric energy conversion device 200 and a user load 300. The electric energy conversion device 200 (including a solar energy conversion device and a wind energy conversion device) is electrically connected to the energy storage device 100, and the energy storage device 100 is electrically connected to the user load 300. In this way, solar energy, wind energy and other forms of energy can be converted into electric energy by the electric energy conversion device 200, and stored by the energy storage device 100, and then supplied to the user load 300 by the energy storage device 100 for use at a peak time of electricity price or when the power grid is powered off.

[0047] The energy storage device 100 can be a battery module, a battery pack, a battery box, a battery system, etc. composed of battery monomers 20 (secondary batteries). The battery monomers 20 can be lithium ion batteries, lithium-sulfur batteries, sodium lithium ion batteries, sodium ion batteries, magnesium ion batteries, etc., and can be in the form of a cylinder, a flat body, a cuboid, etc. The embodiments of the present application do not limit this. Specifically, the battery monomers 20 can use the chemical reaction or change of the energy storage medium (chemical element) to realize the charging and discharging process. In simple terms, the electric energy generated by light energy and wind energy is stored in the battery monomers 20 through the chemical reaction or change of the energy storage medium, and the electric energy stored in the battery monomers 20 is released and used through the chemical reaction or change of the energy storage medium when the use of external electric energy reaches a peak, or is transferred for use.

[0048] In some embodiments, as shown in Figure 2 and Figure 3 The energy storage device 100 comprises a box base 10, battery monomers 20 and a liquid cooling plate 40. The plurality of battery monomers 20 are positioned on the box base 10, and the liquid cooling plate 40 is arranged on the box base 10 and in contact with the battery monomers 20.

[0049] The plurality of battery monomers 20 are arranged in an array, and the plurality of battery monomers 20 can be directly assembled and positioned on the box base 10, or can be assembled into a battery module and then assembled and positioned on the box base 10. The embodiments of the present application do not limit this. When the plurality of battery monomers 20 are directly assembled on the box base 10, after the installation of the battery monomers 20 and the liquid cooling plate 40 is completed, as shown in Figure 2As shown, a group of battery monomers 20 along the thickness direction H of the liquid cooling plate 40 can be bundled by the binding piece 30 to achieve the limiting of the multiple battery monomers 20 on the box base 10. When the multiple battery monomers 20 are assembled into a battery module for assembly, the battery module includes a pair of fixed end plates arranged oppositely, and the multiple battery monomers 20 located between the pair of fixed end plates. The multiple battery monomers 20 and the pair of fixed end plates can be fixed by a binding tool such as a cable tie.

[0050] The liquid cooling plate 40 has a liquid cooling flow channel 414, and the edge of the liquid cooling plate 40 has a water inlet joint 43 and a water outlet joint 44 in communication with the liquid cooling flow channel 414, so as to realize circulation with the outside fluid through the water inlet joint 43, the liquid cooling flow channel 414 and the water outlet joint 44, and then realize cooling of the battery monomer 20 through the contact between the liquid cooling plate 40 and the battery monomer 20. In addition, as shown, Figure 3 As shown, the liquid cooling plate 40 is vertically arranged on the box base 10 and located between adjacent battery monomers 20, so that the two adjacent battery monomers 20 on both sides can be cooled through the two side surfaces of the liquid cooling plate 40, thereby improving the space utilization and ensuring the cooling effect of the liquid cooling plate 40 on the battery monomers 20. Furthermore, when the surface of the liquid cooling plate 40 contacts the battery monomer 20, a large area surface of the battery monomer 20 can be arranged opposite to the surface of the liquid cooling plate 40, or a small area surface of the battery monomer 20 can be arranged opposite to the surface of the liquid cooling plate 40. When the large area surface of the battery monomer 20 faces the surface of the liquid cooling plate 40, it is convenient to increase the heat exchange area between the liquid cooling plate 40 and the battery monomer 20, and ensure the cooling effect on the battery monomer 20.

[0051] In some embodiments, the energy storage device 100 includes a sampling assembly located at the top of the battery monomer 20. The sampling assembly includes an isolation plate covering the multiple battery monomers 20 and a circuit board located on the side of the isolation plate away from the battery monomer 20 and connected with the battery monomer 20.

[0052] The circuit board of the sampling assembly is connected with the battery management system, so that the setting of the sampling harness is avoided through the setting of the circuit board, thereby simplifying the connection between the battery monomer 20 and the battery management system, and facilitating the improvement of the power safety of the energy storage device 100.

[0053] The circuit board is a strip line with a certain width, which can be a FPC (Flexible Printed Circuit) or a FFC (Flexible Flat Cable) and the like. For example, the circuit board includes two layers of insulating films and a sampling trace clamped between the two layers of insulating films.

[0054] The isolation plate can be a plate-shaped structure made of insulating material such as plastic plate, and the circuit board is limited on the isolation plate to avoid shaking of the circuit board during the transportation of the sampling assembly.

[0055] In some embodiments, as shown in Figure 3 and Figure 4 The liquid cooling plate 40 includes a cold plate body 41 and a plurality of elastic members 42; the cold plate body 41 includes a first side plate 411 and a second side plate 412 arranged oppositely, and a liquid cooling cavity 413 is formed between the first side plate 411 and the second side plate 412; the plurality of elastic members 42 are located in the liquid cooling cavity 413, and each elastic member 42 is connected with the first side plate 411 and the second side plate 412 respectively, the plurality of elastic members 42 are distributed along the width direction Y of the cold plate body 41, and the elastic modulus of the plurality of elastic members 42 in the thickness direction H of the cold plate body 41 increases from the middle position to the edge position in the width direction Y of the cold plate body 41.

[0056] In this way, the circulation of the cold fluid is realized through the liquid cooling cavity 413 in the cold plate body 41, so that when the first side plate 411 and the second side plate 412 contact the battery monomer 20, the heat exchange between the battery monomer 20 and the liquid cooling plate 40 is realized, thereby ensuring the heat exchange effect of the liquid cooling plate 40; in addition, through the elastic members 42 arranged between the first side plate 411 and the second side plate 412, the compressible deformation characteristics of the liquid cooling plate 40 in the thickness direction H are realized, so that when the liquid cooling plate 40 is located between the two battery monomers 20, the expansion space of the battery monomer 20 is reserved based on the compression deformation of the liquid cooling plate 40 in the thickness direction H; at the same time, the elastic modulus of the elastic members 42 increases from the middle position to the edge position in the width direction Y of the cold plate body 41, thereby ensuring the synchronous deformation of the first side plate 411 and the second side plate 412 when the battery monomer 20 expands and deforms, that is, ensuring the effective contact of the battery monomer 20 with the liquid cooling plate 40 after expansion, and ensuring the cooling effect of the liquid cooling plate 40 on the battery monomer 20.

[0057] The elastic member 42 can be integrally formed with the first side plate 411 and the second side plate 412, or can be fixed to the first side plate 411 and the second side plate 412 by welding or the like. The elastic member 42 can be a spring-like structure or a structure made of memory metal, as long as it can ensure the synchronous compression deformation of the liquid cooling plate 40 in the thickness direction H when the battery monomer 20 expands, and the synchronous recovery of the liquid cooling plate 40 in the thickness direction H when the battery monomer 20 shrinks. In addition, for the spring-like structure or the structure made of memory metal, even if the elastic member 42 is compressed to the limit state, there is still a certain gap between the first side plate 411 and the second side plate 412, thereby ensuring the circulation of the cold fluid in the liquid cooling cavity 413.

[0058] In some embodiments, as shown in Figure 4As shown, each elastic member 42 is a structure of multiple bending in the thickness direction H of the cold plate body 41, that is, the elastic member 42 includes multiple bending segments connected in sequence in the thickness direction H of the cold plate body 41. At this time, the compression of the elastic member 42 can be realized based on the reduction of the opening degree between adjacent two bending segments, and the recovery of the elastic member 42 can be realized based on the increase of the opening degree between adjacent two bending segments; in addition, through the multiple bending of the elastic member, it is convenient to ensure that the elastic member 42 has a larger compression deformation amount.

[0059] For example, the elastic member 42 is V-shaped, that is, the elastic member 42 includes two bending segments connected in sequence in the thickness direction H of the cold plate body 41; or the elastic member 42 is W-shaped, that is, the elastic member 42 includes four bending segments connected in sequence in the thickness direction H of the cold plate body 41.

[0060] Optionally, for the multiple elastic members 42 distributed in the width direction Y of the cold plate body 41, the multiple elastic members 42 have cross sections perpendicular to the thickness direction of the cold plate body 41 and the same profile shape, and the cross-sectional areas of the multiple elastic members 42 increase from the middle position to the edge position in the width direction Y of the cold plate body 41.

[0061] In this way, for the multiple elastic members 42 distributed in the width direction Y of the cold plate body 41, by adjusting the cross-sectional area (the cross-sectional area perpendicular to the thickness direction H of the cold plate body 41) of each elastic member 42 in the multiple elastic members 42, the compression strength of the multiple elastic members 42 is made different, and then in the case that the cross-sectional area of the multiple elastic members 42 increases from the middle position to the edge position in the width direction Y of the cold plate body 41, the elastic member 42 at the middle position has a relatively small compression strength, and the closer to the edge position, the greater the compression strength of the elastic member 42, so as to ensure that the deformation space of the liquid cooling plate 40 is larger at the middle position, and the deformation space is smaller closer to the edge position.

[0062] For example, the deformation amount of the battery monomer 20 close to the middle position in the width direction Y of the liquid cooling plate 40 is L, the deformation amount between the middle position and the top and bottom edge position is L / 5-L / 2, and the deformation amount at the top and bottom edge position is L / 8-L / 3; at this time, the cross-sectional area of the elastic member 42 at the middle position in the width direction Y of the liquid cooling plate 40 can be set as S, the cross-sectional area of the elastic member 42 between the middle position and the top and bottom edge position in the width direction Y of the liquid cooling plate 40 is 2-5 times of S, and the cross-sectional area of the elastic member 42 at the top and bottom edge position in the width direction Y of the liquid cooling plate 40 is 3-8 times of S.

[0063] For the multiple elastic members 42 distributed in the width direction Y of the cold plate body 41, the cross-sectional area of each elastic member 42 can be as follows Figure 5 or Figure 6The plurality of elastic members 42 shown have different sizes along the width direction Y of the cold plate body 41. Alternatively, the plurality of elastic members 42 can have different sizes along the length direction X of the cold plate body 41 to achieve different cross-sectional areas of the plurality of elastic members 42.

[0064] Optionally, as shown, for the plurality of elastic members 42 distributed at intervals along the width direction Y of the cold plate body 41, the number of bending times of the plurality of elastic members 42 decreases from the middle position to the edge positions in the width direction Y of the cold plate body 41. Figure 4

[0065] In this way, for the plurality of elastic members 42 distributed along the width direction Y of the cold plate body 41, by adjusting the number of bending times (i.e., the number of included bending segments) of each elastic member 42 in the plurality of elastic members 42, the compression resistance of the plurality of elastic members 42 is made different, and in the case where the number of bending times of the plurality of elastic members 42 decreases from the middle position to the edge positions in the width direction Y of the cold plate body 41, the elastic member 42 at the middle position has a relatively small compression resistance, and the closer to the edge position, the greater the compression resistance of the elastic member 42, so as to ensure that the deformation space of the liquid cooling plate 40 is larger at the middle position, and the closer to the edge position, the smaller the deformation space.

[0066] For example, the deformation amount of the battery monomer 20 near the middle position in the width direction Y of the liquid cooling plate 40 is L, the deformation amount between the middle position and the top and bottom edge positions is L / 5-L / 2, and the deformation amount at the top and bottom edge positions is L / 8-L / 3; at this time, the number of bending segments of the elastic member 42 at the middle position in the width direction Y of the liquid cooling plate 40 can be set to 5, the number of bending segments of the elastic member 42 between the middle position and the top and bottom edge positions in the width direction Y of the liquid cooling plate 40 can be set to 3, and the number of bending segments of the elastic member 42 at the top and bottom edge positions in the width direction Y of the liquid cooling plate 40 can be set to 2.

[0067] It should be noted that in addition to adjusting the structural form of the elastic member 42 to make the compression resistance of the plurality of elastic members 42 different, different manufacturing materials can also be used to achieve different compression resistances of the plurality of elastic members 42. For example, the elastic member 42 at the middle position in the width direction Y of the liquid cooling plate 40 can be made of one of 45# alloy steel, SUS304 stainless steel, etc. with relatively small hardness, the elastic member 42 near the top edge in the width direction Y of the liquid cooling plate 40 can be made of one of 7075T6 aluminum alloy, Q235 alloy steel, etc. with relatively large hardness, and the elastic member 42 near the bottom edge in the width direction Y of the liquid cooling plate 40 can be made of one of 5052-T34, 6061-T6 aluminum alloy, etc. with relatively large hardness.

[0068] ​In addition, the compression resistance of the plurality of elastic members 42 can be formed by one of the cross-sectional area, the number of bending times, the material, etc. described above, or can be formed by a combination of at least two. For example, in a combination of the cross-sectional area and the number of bending times, the deformation amount of the battery cell 20 at the middle position in the width direction Y of the liquid cooling plate 40 is L, the deformation amount at a position between the middle position and the top and bottom edges is L / 5 to L / 2, and the deformation amount at the top and bottom edges is L / 8 to L / 3; at this time, the number of bending sections of the elastic member 42 at the middle position in the width direction Y of the liquid cooling plate 40 can be set to 5, and the cross-sectional area can be S, the number of bending sections of the elastic member 42 between the middle position and the top and bottom edges in the width direction Y of the liquid cooling plate 40 can be set to 2, and the cross-sectional area can be 1 to 3 times S, and the number of bending sections of the elastic member 42 at the top and bottom edges in the width direction Y of the liquid cooling plate 40 can be set to 1, and the cross-sectional area can be 2 to 5 times S.

[0069] In some embodiments, as shown in FIG. 4, each of the elastic members 42 is a circular arc structure, and the two opening sides of the elastic member 42 are connected with the first side plate 411 and the second side plate 412, respectively. Figure 5 For the plurality of elastic members 42 distributed along the width direction Y of the cooling plate body 41, the curvature of the circular arc of the plurality of elastic members 42 increases from the middle position to the edge position in the width direction Y of the cooling plate body 41.

[0070] In this way, the elastic member 42 in the circular arc structure is provided, which not only ensures the compressibility of the liquid cooling plate 40 in the thickness direction H, but also simplifies the structure of the elastic member 42 and improves the manufacturing efficiency of the liquid cooling plate 40.

[0071] For the elastic member 42 in the circular arc structure, the compression of the elastic member 42 can be realized based on the decrease of the opening degree of the circular arc, and the recovery of the elastic member 42 can be realized based on the increase of the opening degree of the circular arc. In addition, for the plurality of elastic members 42 distributed along the width direction Y of the cooling plate body 41, the compression resistance of the plurality of elastic members 42 is adjusted by adjusting the bending curvature of the plurality of elastic members 42 (the greater the curvature, the greater the compression resistance), so that the compression resistance of the plurality of elastic members 42 is different, and in the case that the curvature of the plurality of elastic members 42 increases from the middle position to the edge position in the width direction Y of the cooling plate body 41, the elastic member 42 at the middle position has a relatively small compression resistance, and the closer to the edge position, the greater the compression resistance of the elastic member 42, so as to ensure that the deformation space of the liquid cooling plate 40 at the middle position is large, and the closer to the edge position, the smaller the deformation space.

[0072] In the embodiments of the present disclosure, the first side plate 411 and the second side plate 412 can be a flat plate structure, or at least one of the first side plate 411 and the second side plate 412 can have a strip-shaped protrusion 415.

[0073] In some embodiments, as shown in FIG. 4, each of the elastic members 42 is a circular arc structure, and the two opening sides of the elastic member 42 are connected with the first side plate 411 and the second side plate 412, respectively.Figure 4 or Figure 5 As shown in the figure, the first side plate 411 and the second side plate 412 are both flat plate structures, and at this time the liquid cooling cavity 413 enclosed between the first side plate 411 and the second side plate 412 is an entire cavity. In order to realize the circulation flow of the cooling fluid in the cold plate body 41, it can be as shown in the figure Figure 5 or Figure 6 As shown in the figure, the plurality of elastic members 42 divide the liquid cooling cavity 413 into a plurality of liquid cooling flow channels 414; the plurality of liquid cooling flow channels 414 are distributed along the width direction Y of the cold plate body 41, and all extend along the length direction X of the cold plate body 41; the ends of the plurality of liquid cooling flow channels 414 are sequentially communicated to form parallel water inlet flow channels and parallel water outlet flow channels, and the water inlet flow channels and the water outlet flow channels are communicated in a U shape; or form a winding S-shaped flow channel, etc.

[0074] Among them, the first side plate 411 and the second side plate 412 are set to be flat plate structures to simplify the manufacturing process of the cold plate body 41. In addition, as shown in the figure Figure 6 As shown in the figure, the elastic member 42 is a strip-shaped structure extending along the length direction X of the cold plate body 41, the length of the elastic member 42 is slightly shorter than the length of the cold plate body 41, and at least part of the elastic member 42 is distributed in the length direction X of the cold plate body 41 to form a liquid cooling flow channel 414 between the adjacent two elastic members 42, so that the adjacent two liquid cooling flow channels 414 are communicated at one end in the length direction X of the cold plate body 41, thereby realizing the sequential communication of the ends of the plurality of liquid cooling flow channels 414.

[0075] In other embodiments, at least one of the first side plate 411 and the second side plate 412 has a strip-shaped protrusion 415, and at this time the length direction of the protrusion 415 is perpendicular to the width direction of the cold plate body 41, so as to separate the liquid cooling cavity 413 enclosed between the first side plate 411 and the second side plate 412 into a plurality of liquid cooling flow channels 414 by the protrusion 415.

[0076] Among them, the plurality of liquid cooling flow channels 414 are distributed along the width direction Y of the cold plate body 41, and all extend along the length direction X of the cold plate body 41; the ends of the plurality of liquid cooling flow channels 414 are sequentially communicated to form parallel water inlet flow channels and parallel water outlet flow channels, and the water inlet flow channels and the water outlet flow channels are communicated in a U shape; or form a winding S-shaped flow channel, etc. At this time, an elastic member 42 is arranged in each liquid cooling flow channel 414 to realize the flow disturbance of the cooling fluid in the liquid cooling flow channel 414 by the elastic member 42, thereby improving the heat exchange effect of the cooling fluid and the battery monomer 20.

[0077] Among them, the protrusions on the first side plate 411 and / or the second side plate 412 can be formed by stamping, and the protrusion 415 can be a strip-shaped rectangular protrusion, a strip-shaped trapezoidal protrusion, a strip-shaped semicircular protrusion, a strip-shaped semicircular protrusion, etc. For example, as shown in the figure Figure 7 and Figure 8As shown, the first side plate 411 and the second side plate 412 have oppositely arranged and abutting protrusions 415, which are strip-shaped semicircular protrusions, to divide the liquid cooling cavity 413 into multiple liquid cooling flow channels 414 by the protrusions 415 on the first side plate 411 and the second side plate 412. In addition, the connection between the protrusions 415 on the first side plate 411 and the second side plate 412 and the side plate body is chamfered (such as a rounded chamfer structure) to reduce the elastic deformation of the side plate body restricted by the protrusions 415.

[0078] Wherein, for the strip-shaped protrusions 415 on the first side plate 411 and the second side plate 412, the protrusions 415 extend along the length direction X of the cold plate body 41, and one end of the protrusions 415 in the length direction X abuts against the side wall of the liquid cooling cavity 413, and a gap is formed between the other end of the protrusions 415 in the length direction X and the side wall of the liquid cooling cavity 413, so as to realize the communication of the end portions of the liquid cooling flow channels 414 on both sides of the protrusions 415. When the first side plate 411 and the second side plate 412 form multiple protrusions 415 arranged at intervals in the width direction Y of the cold plate body 41, at least part of the protrusions 415 are staggered in the length direction X of the cold plate body 41 to ensure that the end portions of the multiple liquid cooling flow channels 414 are sequentially communicated.

[0079] Wherein, the liquid cooling cavity 413 is divided into multiple liquid cooling flow channels 414 by the protrusions 415, and the elastic member 42 only needs to be supported between the first side plate 411 and the second side plate 412. Alternatively, the elastic member 42 has a columnar structure in the thickness direction H of the cold plate body 41 to reduce the support area of the elastic member 42 between the first side plate 411 and the second side plate 412, thereby reducing the deformation restriction of the elastic member 42 on the first side plate 411 and the second side plate 412, and improving the synchronization of the deformation of the first side plate 411 and the second side plate 412 when the battery monomer 20 expands.

[0080] Wherein, the elastic member 42 can be a compression spring or the like structure to simplify the design difficulty of the elastic member 42; of course, the elastic member 42 can be a structure after the elastic rod is bent to reduce the structural complexity of the elastic member 42, so as to reduce the flow resistance of the cold fluid while ensuring the formation of turbulence of the cold fluid.

[0081] In the embodiments of the present application, the terms "first", "second", "third" are only used for descriptive purpose and should not be understood as indicating or implying relative importance. The term "multiple" refers to two or more, unless otherwise explicitly limited. The terms "mount", "connect", "connection", "fix", and the like should be interpreted broadly, for example, "connection" can be fixed connection, or detachable connection, or integral connection; "connection" can be direct connection, or indirect connection through intermediate medium. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0082] In the description of the embodiments of the present application, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the embodiments of the present application and simplify the description, and do not indicate or imply that the device or unit referred to must have a particular direction, be constructed and operated in a particular orientation, therefore, it should not be understood as a limitation on the embodiments of the present application.

[0083] In the description of the present application, the terms "one embodiment", "some embodiments", "a specific embodiment", and the like, mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0084] The above is only the preferred embodiment of the present application, and is not intended to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A liquid-cooled plate, characterized in that, Comprise: A cold plate body (41) comprising oppositely arranged first and second side plates (411, 412), a liquid cooling cavity (413) being formed between the first and second side plates (411, 412); A plurality of elastic members (42) located in the liquid cooling cavity (413), each of the elastic members (42) being connected with the first and second side plates (411, 412), the plurality of elastic members (42) being spaced apart along the width direction of the cold plate body (41), and the elastic modulus of the plurality of elastic members (42) in the thickness direction of the cold plate body (41) increasing from the middle position to the edge positions in the width direction of the cold plate body (41).

2. The liquid cold plate of claim 1, wherein, Each of the elastic members (42) is a structure bent multiple times in the thickness direction of the cold plate body (41).

3. The liquid cold plate of claim 2, wherein, For the plurality of elastic members (42) spaced apart along the width direction of the cold plate body (41), the plurality of elastic members (42) have cross sections perpendicular to the thickness direction of the cold plate body (41) and the same profile shape, and the cross-sectional area of the plurality of elastic members (42) increases from the middle position to the edge positions in the width direction of the cold plate body (41).

4. The liquid cold plate of claim 2, wherein, For the plurality of elastic members (42) spaced apart along the width direction of the cold plate body (41), the number of bends of the plurality of elastic members (42) decreases from the middle position to the edge positions in the width direction of the cold plate body (41).

5. The liquid cold plate of claim 1, wherein, Each of the elastic members (42) is a circular arc structure, and the two opening sides of the elastic member (42) are connected with the first and second side plates (411, 412), respectively. For the plurality of elastic members (42) spaced apart along the width direction of the cold plate body (41), the curvature of the circular arc of the plurality of elastic members (42) increases from the middle position to the edge positions in the width direction of the cold plate body (41).

6. The liquid cold plate of any of claims 1-5, wherein, The plurality of elastic members (42) divide the liquid cooling cavity (413) into a plurality of liquid cooling flow channels (414); The plurality of liquid cooling flow channels (414) are distributed along the width direction of the cold plate body (41) and extend along the length direction of the cold plate body (41), and the end portions of the plurality of liquid cooling flow channels (414) are sequentially communicated.

7. The liquid cold plate of any of claims 1-5, wherein, At least one of the first and second side plates (411, 412) has a strip-shaped protrusion (415); The length direction of the protrusion (415) is perpendicular to the width direction of the cold plate body (41), and the protrusion (415) divides the liquid cooling cavity (413) into a plurality of liquid cooling flow channels (414), each of the plurality of liquid cooling flow channels (414) has the elastic member (42), the plurality of liquid cooling flow channels (414) are distributed along the width direction of the cold plate body (41) and extend along the length direction of the cold plate body (41), and the end portions of the plurality of liquid cooling flow channels (414) are sequentially communicated.

8. The liquid cold plate of claim 7, wherein, The elastic member (42) is a compression spring.

9. The liquid cold plate of any of claims 1-5, wherein, The material of the elastic member (42) is a memory metal.

10. An energy storage device, characterized by, Comprise: A box base (10); a plurality of battery cells (20) are positioned on the box base (10); The liquid cooling plate (40) of any one of claims 1-9 is erected on the box base (10) and located between adjacent battery cells (20).

11. An energy storage system characterized by, The energy storage system comprises the energy storage device (100) of claim 10.

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