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 pipe and a cooling plate assembly, the cooling pipe is of an integrated bent structure and comprises a vertical surface pipe section, a first bottom surface pipe section and a second bottom surface pipe section, and the first bottom surface pipe section and the second bottom surface pipe section are connected to the two sides of the vertical surface pipe section; the cold plate assembly comprises a first vertical plate, a second vertical plate, a first bottom plate and a second bottom plate, the first vertical plate and the second vertical plate are located on the two sides of the vertical face pipe section correspondingly and fixedly connected with the vertical face pipe section, and the first bottom plate and the second bottom plate are fixedly connected with the first bottom face pipe section and the second bottom face pipe section correspondingly.

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 its performance in all aspects are also getting higher and higher.

[0003] In related technologies, the energy storage device includes a battery box, a liquid cooling plate and a battery module. The liquid cooling plate is located at the bottom of the battery box, and the battery module composed of secondary batteries is supported on the liquid cooling plate, so that the secondary batteries at the bottom of the battery module are cooled and cooled by the liquid cooling plate, thereby ensuring the charge and discharge performance of the secondary batteries.

[0004] However, as the charge and discharge rate of the secondary battery increases, the heat generation of the secondary battery also increases, so that the liquid cooling plate in the related art is difficult to meet the effective cooling of the secondary battery. Invention content

[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 which effectively improve the cooling effect.

[0006] To achieve the above application purpose, the technical scheme adopted by the present application is as follows:

[0007] According to one aspect of the present application, a liquid cooling plate is provided, comprising: a cold pipe, the cold pipe is an integral bending structure, and comprises a vertical pipe segment and first and second bottom pipe segments connected on both sides of the vertical pipe segment; a cold plate assembly comprising first and second vertical plates, first and second bottom plates, the first and second vertical plates are respectively located on both sides of the vertical pipe segment and are fixedly connected with the vertical pipe segment, and the first and second bottom plates are fixedly connected with the first and second bottom pipe segments, respectively.

[0008] In the present application, by providing a cold pipe comprising a vertical pipe segment and a bottom pipe segment (first and second bottom pipe segments), the multi-surface cooling effect of the liquid cooling plate can be easily achieved, so that when the liquid cooling plate is assembled with the battery box, the multi-surface cooling of the battery module can be achieved, and the cooling effect of the battery module is ensured. In addition, the provision of an integral bending cold pipe can avoid the provision of a liquid cooling joint, thereby facilitating the reduction of cold fluid leakage in the cold pipe and ensuring the safety of the liquid cooling plate cooling.

[0009] According to an embodiment of the present application, the vertical pipe section comprises a first pipe section, a second pipe section and an elastic pipe section; the elastic pipe section is connected to the first pipe section and the second pipe section, and the first pipe section and the second pipe section are connected to the first bottom pipe section and the second bottom pipe section respectively; the first vertical plate and the second vertical plate are flat plates and are fixedly connected to the first pipe section and the second pipe section respectively.

[0010] In the embodiment of the present application, the relative displacement between the first vertical plate and the second vertical plate can be realized based on the elastic deformation of the elastic pipe section by the arrangement of the elastic pipe section and the fixed connection of the first vertical plate and the second vertical plate to the first pipe section and the second pipe section respectively. When the liquid cooling plate is used to support the first battery module and the second battery module, the heat exchange area between the first battery module and the first vertical plate and between the second battery module and the second vertical plate can be ensured, and the relative positions of the first battery module and the second battery module can be adjusted.

[0011] According to an embodiment of the present application, the plane in which the first pipe section is located and the plane in which the second pipe section is located are arranged to be non-coplanar.

[0012] In the embodiment of the present application, the first pipe section and the second pipe section are distributed in the thickness direction of the first vertical plate, and the relative displacement of the first pipe section and the second pipe section in the thickness direction of the first vertical plate can be realized under the elastic deformation of the elastic pipe section, so as to reserve the expansion space of the battery monomer.

[0013] According to an embodiment of the present application, the opposite surfaces of the first vertical plate and the second vertical plate are provided with protrusions, and the protrusions fill the pipe section gaps of the vertical pipe section.

[0014] In the embodiment of the present application, the heat transfer area of the first vertical plate, the second vertical plate and the vertical pipe section can be increased by the arrangement of the protrusions, that is, in addition to the direct heat transfer between the first vertical plate, the second vertical plate and the vertical pipe section through the contact position, the indirect heat conduction can also be realized through the protrusions.

[0015] According to an embodiment of the present application, the protrusions on the first vertical plate and the protrusions on the second vertical plate are distributed in a staggered manner, and the height of the protrusions is equal to the distance between the opposite surfaces of the first vertical plate and the second vertical plate.

[0016] In the embodiment of the present application, the heat transfer area of the first vertical plate, the second vertical plate and the vertical pipe section is increased by the protrusions on the first vertical plate and the second vertical plate, and the heat conduction between the first vertical plate and the second vertical plate is also realized, so as to ensure that the first vertical plate and the second vertical plate have close cooling effects on the first battery module and the second battery module respectively.

[0017] According to an embodiment of the present application, the protrusion on the first vertical plate abuts against the protrusion on the second vertical plate.

[0018] According to an embodiment of the present application, the liquid cooling plate comprises a first support, the first support is located in the pipe segment gap of the first bottom pipe segment and is fixedly connected with the first bottom plate, and the first support protrudes from the first bottom pipe segment in a direction away from the first bottom plate.

[0019] In the embodiment of the present application, the first support is arranged to avoid extrusion of the first bottom pipe segment when the battery module is arranged on the liquid cooling plate, thereby avoiding deformation of the first bottom pipe segment. In addition, the arrangement of the first support can increase the heat transfer area between the first bottom plate and the first bottom pipe segment, that is, in addition to direct heat transfer through the contact part, indirect heat conduction can also be achieved through the first support.

[0020] According to an embodiment of the present application, the first vertical plate and the second vertical plate each have a stress release gap.

[0021] In the embodiment of the present application, the stress release gap is arranged to facilitate elastic deformation of the first vertical plate and the second vertical plate under external force, that is, when the battery monomer deforms by swelling, the first vertical plate and the second vertical plate can deform at the stress release gap to reserve a swelling space for the battery monomer while ensuring the effective heat exchange area between the first vertical plate, the second vertical plate and the battery monomer. In addition, the arrangement of the stress release gap facilitates the discharge of the adhesive material and / or the heat-conducting material between the battery monomer and the vertical plate, so as to ensure the adhesive effect and heat transfer effect of the battery monomer and the vertical plate, while avoiding the situation that the adhesive layer or the heat-conducting layer is too thick.

[0022] According to an embodiment of the present application, the stress release gap comprises a first gap and a plurality of second gaps, the plurality of second gaps are distributed along the length direction of the first gap, and each second gap intersects with the first gap.

[0023] According to an aspect of the present application, a kind of energy storage device is provided, comprising: battery box;The liquid cooling plate described in the above aspect is located at the bottom of the battery box, and the vertical pipe segment included in the liquid cooling plate is erected in the battery box;A plurality of battery modules are contained in the battery box, and at least include first battery module and second battery module, the first battery module, the second battery module is supported on the first bottom plate, the second bottom plate respectively.

[0024] According to an aspect of the present application, a kind of energy storage system is provided, and the energy storage system comprises the energy storage device described in the above aspect.

[0025] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory and are not restrictive of the application. BRIEF DESCRIPTION OF DRAWINGS

[0026] The above and other features and advantages of the present application will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings in which:

[0027] Figure 1 is a schematic diagram of an energy storage system according to an exemplary embodiment.

[0028] Figure 2 is a partial exploded structural schematic diagram of an energy storage device according to an exemplary embodiment.

[0029] Figure 3 is an axial side exploded structural schematic diagram of a liquid cooling plate according to an exemplary embodiment.

[0030] Figure 4 is an axial side bottom view structural schematic diagram of a liquid cooling plate according to an exemplary embodiment.

[0031] Figure 5 is an axial side exploded structural schematic diagram of another liquid cooling plate according to an exemplary embodiment.

[0032] Figure 6 is a structural schematic diagram of a cold pipe of 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, battery box; 20, liquid cooling plate; 30, battery module;

[0036] 11, lower box; 31, first battery module; 32, second battery module;

[0037] 21, cold pipe; 22, cold plate assembly; 23, water inlet joint; 24, water outlet joint;

[0038] 211, vertical pipe section; 212, first bottom pipe section; 213, second bottom pipe section;

[0039] 2111, first pipe section; 2112, second pipe section; 2113, elastic pipe section;

[0040] 221 first vertical plate; 222 second vertical plate; 223 first bottom plate; 224 second bottom plate; 225 first support; 226 second support;

[0041] 2211 protrusion; 2212 stress release gap; 2213 first crack; 2214 second crack. DETAILED DESCRIPTION

[0042] Example embodiments now will be described more fully hereinafter with reference to the accompanying drawings. Example embodiments, however, can be implemented in many different forms and should not be construed as limited to the implementations set forth herein; rather, these implementations are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. Like reference numerals refer to like elements throughout the figures, and thus a detailed description of them will not be repeated.

[0043] Since the energy required by people has strong time and space, in order to reasonably use energy and improve utilization, it is necessary to store one energy form into the same energy form or convert into another energy form through a medium or device, and then release it in a specific energy form based on future application.

[0044] At present, green energy mainly includes light energy, wind energy, etc., and light energy and wind energy have the problems of strong intermittency and large fluctuation, which will cause the voltage instability of green power grid (not enough electricity at peak electricity consumption time, and too much electricity at low electricity consumption time), and the unstable voltage will cause damage to electricity, Therefore, due to insufficient electricity demand or insufficient grid accommodation capacity, the problem of "abandoning wind and light" may occur.

[0045] In order to solve the problem of insufficient electricity demand or insufficient grid accommodation capacity, it is necessary to rely on energy storage devices. That is, through energy storage devices, electric energy is stored in other forms of energy through physical or chemical means, and when needed, the energy stored in the energy storage device is converted into electric energy and released. Simply put, the energy storage device is similar to a large "power bank", which stores electric energy when light energy and wind energy are sufficient, and releases the stored electric energy when needed.

[0046] The current energy storage (i.e. energy storage) application scenarios are relatively wide, including power generation side energy storage, power grid side energy storage, renewable energy grid-connected energy storage, and user side energy storage, etc. The corresponding types of energy storage devices include:

[0047] (1) Large energy storage containers applied in power grid side energy storage scenarios, which can be used as high-quality active and reactive power regulation power sources in the power grid, realize load matching of electric energy in time and space, enhance renewable energy consumption capacity, and have great significance in power grid system backup, relieving peak load power supply pressure and peak regulation;

[0048] (2) Small and medium-sized energy storage cabinets applied in commercial energy storage scenarios (banks, shopping malls, etc.) on the user side and small household energy storage boxes applied in household energy storage scenarios on the user side, mainly operating in the mode of “peak load shifting”. Due to the large price difference between the electricity fees in the peak and valley positions according to the electricity demand, after the user has an energy storage device, in order to reduce the cost, the energy storage device (energy storage cabinet / box) is usually charged in the low electricity price valley period; and the electricity in the energy storage device is discharged for use in the high electricity price peak period, so as to achieve the purpose of saving electricity fees. In addition, in remote areas and areas with high incidence of natural disasters such as earthquakes and hurricanes, the existence of household energy storage devices is equivalent to that the user provides a standby power source for himself and the power grid, and eliminates the inconvenience caused by frequent power outages due to disasters or other reasons.

[0049] The energy storage system provided by the embodiments of the present application includes an energy storage device to realize the storage or supply of electric energy through the energy storage device.

[0050] Taking the household energy storage scenario in the user-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 includes an energy storage device 100 and an electric energy conversion device 200 (such as a photovoltaic panel), and a user load 300 (such as a street lamp, a household appliance, etc.), the electric energy conversion device 200 is electrically connected with the energy storage device 100, and the energy storage device 100 is electrically connected with the user load 300. The energy storage device 100 is a small energy storage box, which can be installed on an outdoor wall in a wall-mounted manner. Specifically, the electric energy conversion device 200 can convert solar energy into electric energy, and store the electric energy through the energy storage device 100, and then supply the electric energy to the user load 300 for use in the high electricity price peak period or when the power grid is powered off.

[0051] The energy storage device 100 can be a battery pack, a battery box, a battery system, etc. composed of battery monomers. The battery monomers can be secondary batteries such as 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 flat body, a cuboid, etc., which is not limited in the embodiments of the present application. In addition, the battery monomers can realize the charging and discharging process through the chemical reaction or change of the energy storage medium (chemical element). Simply speaking, the electric energy generated by light energy and wind energy is stored in the battery monomers through the chemical reaction or change of the energy storage medium, and when the use of external electric energy reaches the peak, the electric energy stored in the battery monomers is released and used through the chemical reaction or change of the energy storage medium.

[0052] In some embodiments, as Figure 2As shown, the energy storage device 100 includes a battery box 10, a liquid cooling plate 20, and a plurality of battery modules 30; the liquid cooling plate 20 is located at the bottom of the battery box 10, and the plurality of battery modules 30 are accommodated in the battery box 10 and carried on the liquid cooling plate 20.

[0053] The battery box 10 includes a lower box 11 and a box cover (not shown in the figure), and the box cover is fixedly connected with the lower box 11 to enclose a battery compartment, and the liquid cooling plate 20 and the plurality of battery modules 30 are located in the battery compartment.

[0054] The battery module 30 includes a plurality of battery monomers, that is, the battery module 30 is composed of a plurality of battery monomers alone, at this time, the assembly of the battery module 30 can be realized through the assembly of the plurality of battery monomers alone; or the battery module 30 includes a pair of fixed end plates arranged opposite to each other, and a plurality of battery monomers located between the pair of fixed end plates, and the plurality of battery monomers and the pair of fixed end plates can be fixed by a binding tool such as a cable tie, at this time, the assembly of the battery module 30 can be realized through the assembly of the plurality of battery monomers as a whole.

[0055] In the related art, the liquid cooling plate 20 is arranged at the bottom of the plurality of battery modules 30 to exchange heat at the bottom of the battery monomers to cool the battery monomers. However, as the charge-discharge rate of the battery monomers increases, the heat generation of the battery monomers also increases accordingly, and when cooling is performed only at the bottom of the battery monomers, it is difficult to ensure that the battery monomers work at a suitable temperature.

[0056] The embodiment of the present application provides a liquid cooling plate 20 which is mainly composed of a cold pipe 21 having a vertical pipe segment 211 and a bottom pipe segment. In this way, when the liquid cooling plate 20 is applied to the energy storage device 100, multi-face cooling of the battery module 30 can be realized based on the vertical pipe segment 211 and the bottom pipe segment, thereby improving the cooling effect of the battery module 30 to ensure that the battery monomers included in the battery module 30 are charged and discharged at a suitable temperature.

[0057] In some embodiments, as shown in Figure 3 The liquid cooling plate 20 includes a cold pipe 21 and a cold plate assembly 22. The cold pipe 21 is of an integrated bending structure and includes a vertical pipe segment 211 and first and second bottom pipe segments 212 and 213 connected on both sides of the vertical pipe segment 211. The cold plate assembly 22 includes first and second vertical plates 221 and 222, and first and second bottom plates 223 and 224. The first and second vertical plates 221 and 222 are respectively located on both sides of the vertical pipe segment 211 and are fixedly connected with the vertical pipe segment 211. The first and second bottom plates 223 and 224 are respectively fixedly connected with the first and second bottom pipe segments 212 and 213.

[0058] In the embodiment of the present application, by arranging the cooling pipe 21 including the vertical pipe section 211 and the bottom pipe section (the first bottom pipe section 212 and the second bottom pipe section 213), the multi-surface cooling effect of the liquid cooling plate 20 can be achieved, so that when the liquid cooling plate 20 is assembled in the battery box 10, the multi-surface cooling of the battery module 30 can be achieved, and the cooling effect of the battery module 30 is ensured. In addition, the integrally bent cooling pipe 21 is arranged, which can avoid the arrangement of the liquid cooling joint, thereby reducing the leakage of the cooling fluid in the cooling pipe 21, and ensuring the safety of the liquid cooling plate 20.

[0059] The vertical pipe section 211, the first bottom pipe section 212 and the second bottom pipe section 213 are all S-shaped around pipes, and the integrally bent cooling pipe 21 is in an inverted T-shaped structure. The two ends of the vertical pipe section 211 are respectively communicated with one end of the first bottom pipe section 212 and one end of the second bottom pipe section 213, and the other end of the first bottom pipe section 212 and the other end of the second bottom pipe section 213 are respectively provided with the water inlet joint 23 and the water outlet joint 24, so as to communicate the cooling pipe 21 with the external circulation pipeline, and further ensure the circulation of the fluid in the cooling pipe 21.

[0060] The first bottom plate 223 and the second bottom plate 224 can be respectively supported on the first bottom pipe section 212 and the second bottom pipe section 213, or the first bottom pipe section 212 and the second bottom pipe section 213 can be respectively supported on the first bottom plate 223 and the second bottom plate 224. In addition, the first bottom plate 223 and the first vertical plate 221, and the second bottom plate 224 and the second vertical plate 222 can be designed in a split type, so that when the battery monomer is deformed and extrudes the first vertical plate 221 and the second vertical plate 222 to deform, the first bottom plate 223 and the second bottom plate 224 will not be deformed or torn. Of course, when the first bottom plate 223 and the second bottom plate 224 are respectively supported on the first bottom pipe section 212 and the second bottom pipe section 213, the first bottom plate 223 and the first vertical plate 221, and the second bottom plate 224 and the second vertical plate 222 can be integrally bent and formed.

[0061] In combination with the above-mentioned energy storage device 100, when the liquid cooling plate 20 is applied to the energy storage device 100, the liquid cooling plate 20 is located at the bottom of the battery box 10, and the vertical pipe section 211 included in the liquid cooling plate 20 is vertically arranged in the battery box 10. For the first battery module 31 and the second battery module 32 included in the plurality of battery modules 30, the first battery module 31 and the second battery module 32 are respectively supported on the first bottom plate 223 and the second bottom plate 224.

[0062] The first battery module 31 and the second battery module 32 can be directly supported on the first bottom plate 223 and the second bottom plate 224, that is, the first battery module 31 and the second battery module 32 are in surface contact with the first bottom plate 223 and the second bottom plate 224 respectively to realize heat exchange; or the surfaces of the first bottom plate 223 and the second bottom plate 224 are provided with heat-conducting glue, and the first battery module 31 and the second battery module 32 can be supported on the first bottom plate 223 and the second bottom plate 224 through the heat-conducting glue to ensure the reliability of heat transfer between the first battery module 31 and the first bottom plate 223 and between the second battery module 32 and the second bottom plate 224 respectively, and to ensure the stability of support of the first battery module 31 on the first bottom plate 223 and of the second battery module 32 on the second bottom plate 224 respectively.

[0063] The first battery module 31 and the second battery module 32 can be directly in contact with the first vertical plate 221 and the second vertical plate 222 respectively, or can be bonded through heat-conducting glue to ensure the reliability of heat transfer between the first battery module 31 and the first vertical plate 221 and between the second battery module 32 and the second vertical plate 222 respectively. In addition, for the battery monomers included in the first battery module 31 and the second battery module 32, the small face region of the battery monomer can face the corresponding first vertical plate 221 and second vertical plate 222 respectively, or the large face region of the battery monomer can face the corresponding first vertical plate 221 and second vertical plate 222 respectively to increase the heat exchange area of the battery monomers of the first battery module 31 and the second battery module 32 and the first vertical plate 221 and the second vertical plate 222.

[0064] In some embodiments, as shown in Figure 3 or Figure 4 The liquid cooling plate 20 includes a first support 225; the first support 225 is located in the pipe segment gap of the first bottom pipe segment 212 and is fixedly connected with the first bottom plate 223, and the first support 225 protrudes from the first bottom pipe segment 212 in a direction away from the first bottom plate 223.

[0065] In this way, by arranging the first support 225, the first bottom pipe segment 212 can be avoided from being squeezed when the battery module 30 is arranged on the liquid cooling plate 20, so that the deformation of the first bottom pipe segment 212 is avoided; in addition, by arranging the first support 225, the heat transfer area of the first bottom plate 223 and the first bottom pipe segment 212 can be increased, that is, in addition to the direct heat transfer through the contact part between the first bottom plate 223 and the first bottom pipe segment 212, the indirect heat conduction through the first support 225 can also be realized.

[0066] In the thickness direction of the first bottom plate 223, the size of the first support 225 is greater than the size of the first bottom tube segment 212, so as to ensure that the first support 225 protrudes from the first bottom tube segment 212. In addition, the first support 225 can be a bent structure, and the shape after bending is approximately the same as the bent shape of the first bottom tube segment 212, so as to simplify the structure of the first support 225 while ensuring that the first support 225 supports the first bottom tube segment 212. Of course, the liquid cooling plate 20 can also include a plurality of strip-shaped first supports 225, and the plurality of supports are located in the tube segment gap of the first bottom tube segment 212 and are fixedly connected with the first bottom plate 223, so as to facilitate the manufacturing of the first support 225.

[0067] In addition, as shown in Figure 3 or Figure 4 The liquid cooling plate 20 also includes a second support 226; the second support 226 is located in the tube segment gap of the second bottom tube segment 213 and is fixedly connected with the second bottom plate 224, and in the thickness direction of the second bottom plate 224, the second support 226 protrudes from the second bottom tube segment 213.

[0068] In this way, by arranging the second support 226, the second bottom tube segment 213 can be prevented from being squeezed when the battery module 30 is arranged on the liquid cooling plate 20, so as to prevent the second bottom tube segment 213 from being deformed. In addition, by arranging the second support 226, the heat transfer area between the second bottom plate 224 and the second bottom tube segment 213 can be increased, that is, in addition to the direct heat transfer through the contact position, the second support 226 can also realize indirect heat conduction.

[0069] The specific structure of the second support 226 can refer to the first support 225 described above, and the present application will not be described here.

[0070] In some embodiments, as shown in Figure 5 or Figure 6 The vertical tube segment 211 includes a first tube segment 2111, a second tube segment 2112 and an elastic tube segment 2113; the elastic tube segment 2113 communicates the first tube segment 2111 and the second tube segment 2112, and the first tube segment 2111 and the second tube segment 2112 are respectively communicated with the first bottom tube segment 212 and the second bottom tube segment 213; the first vertical plate 221 and the second vertical plate 222 are both flat plates and are respectively fixedly connected with the first tube segment 2111 and the second tube segment 2112.

[0071] Thus, by the arrangement of the elastic pipe segment 2113 and the fixed connection of the first vertical plate 221 and the second vertical plate 222 with the first pipe segment 2111 and the second pipe segment 2112 respectively, the relative displacement between the first vertical plate 221 and the second vertical plate 222 can be realized based on the elastic deformation of the elastic pipe segment 2113. When the liquid cooling plate 20 is used to support the first battery module 31 and the second battery module 32, the heat exchange area between the first battery module 31 and the first vertical plate 221 and between the second battery module 32 and the second vertical plate 222 can be ensured, and the relative positions of the first battery module 31 and the second battery module 32 can be adjusted.

[0072] In some embodiments, the elastic pipe segment 2113 can be an arc-shaped pipe segment, and the cold pipe 21 can be a metal pipe with soft material, so as to ensure the elastic bending performance of the elastic pipe segment 2113. In addition, the first pipe segment 2111 and the second pipe segment 2112 can be arranged in regions. For example, the first pipe segment 2111 is arranged in a region close to the first bottom plate 223, and the second pipe segment 2112 is arranged in a region away from the first bottom plate 223. Alternatively, at least part of the first pipe segment 2111 and the second pipe segment 2112 are alternately distributed, that is, part of the first pipe segment 2111 and part of the second pipe segment 2112 exist in the same region of the vertical pipe segment 211.

[0073] Alternatively, the plane in which the first pipe segment 2111 is located and the plane in which the second pipe segment 2112 is located are arranged in a non-coplanar manner.

[0074] In some embodiments, the first pipe segment 2111 and the second pipe segment 2112 are distributed in a staggered manner in the thickness direction of the first vertical plate 221. The relative displacement between the first pipe segment 2111 and the second pipe segment 2112 in the width direction of the liquid cooling plate 20 can be realized under the elastic deformation of the elastic pipe segment 2113. When the liquid cooling plate 20 is used to support the first battery module 31 and the second battery module 32, the expansion space of the battery monomer can be reserved based on the relative displacement between the first vertical plate 221 and the second vertical plate 222 in the thickness direction of the first vertical plate 221, so as to avoid the problem that the connection between the first battery module 31, the second battery module 32 and the liquid cooling plate 20 is loose due to the expansion and deformation of the battery monomer.

[0075] In some embodiments, as shown in Figure 3 or Figure 5 The first vertical plate 221 and the second vertical plate 222 each have a stress release crack.

[0076] Thus, by arranging the stress release gap 2212, the elastic deformation of the first vertical plate 221 and the second vertical plate 222 under the external force is facilitated, that is, when the battery monomer expands and deforms, the first vertical plate 221 and the second vertical plate 222 can deform at the stress release gap 2212, so as to reserve the expansion space of the battery monomer while ensuring the effective heat exchange area between the first vertical plate 221, the second vertical plate 222 and the battery monomer. In addition, by arranging the stress release gap, the external discharge of the bonding material and / or the heat-conducting material between the battery monomer and the vertical plate is facilitated, so as to ensure the bonding effect and the heat transfer effect of the battery monomer and the vertical plate, while avoiding the case that the bonding layer or the heat-conducting layer is too thick.

[0077] The height of the stress release gap 2212 on the first vertical plate 221 and the second vertical plate 222 can be set based on 1 / 2 of the height of the battery monomer, so as to ensure that the maximum expansion area of the battery monomer and the stress release gap 2212 are located at the same height. Specifically, the center point of the stress release gap 2212 can correspond to the center point of the upper surface of the battery monomer. In addition, the number of stress release gaps 2212 on the first vertical plate 221 and the second vertical plate 222 can correspond to the number of battery monomers included in the battery module 30, that is, one stress release gap 2212 corresponds to one battery monomer.

[0078] Optionally, as shown in Figure 3 or Figure 5 The stress release gap includes a first crack 2213 and a plurality of second cracks 2214; the plurality of second cracks 2214 are distributed along the length direction of the first crack 2213, and each second crack 2214 intersects the first crack 2213. Thus, by the intersecting first crack 2213 and second crack 2214, the deformation resistance of the area (such as an ellipse) where the stress release gap 2212 is located can be reduced, thereby facilitating the synchronous deformation when the battery monomer expands.

[0079] For example, in the case of heat exchange between the large area of the battery monomer and the vertical plate, the length direction of the first crack 2213 can be the length direction of the liquid cooling plate 20, and the length direction of the second crack 2214 can be the height direction of the liquid cooling plate 20 and the thickness direction of the first bottom plate 223; for example, in the case of heat exchange between the small area of the battery monomer and the vertical plate, the length direction of the first crack 2213 can be the height direction of the liquid cooling plate 20 and the thickness direction of the first bottom plate 223, and the length direction of the second crack 2214 can be the length direction of the liquid cooling plate 20. In addition, the lengths of the plurality of second cracks 2214 can be the same or not all equal, and the plurality of second cracks 2214 are symmetrically distributed along the median line of the first crack 2213, so as to ensure the matching of the deformation of the area where the stress release gap 2212 is located on the first vertical plate 221 and the second vertical plate 222 and the expansion of the battery monomer.

[0080] In some embodiments, as shown in Figure 3 and Figure 5 The opposite surfaces of the first vertical plate 221 and the second vertical plate 222 are provided with protrusions 2211, which fill the pipe segment gaps of the vertical pipe segments 211.

[0081] The protrusions 2211 increase the heat transfer area between the first vertical plate 221, the second vertical plate 222 and the vertical pipe segments 211. In addition to direct heat transfer through the contact parts, the protrusions 2211 can also realize indirect heat conduction between the first vertical plate 221, the second vertical plate 222 and the vertical pipe segments 211.

[0082] Optionally, the protrusions 2211 on the first vertical plate 221 are distributed in a staggered manner with the protrusions 2211 on the second vertical plate 222, and the height of the protrusions 2211 is equal to the distance between the opposite surfaces of the first vertical plate 221 and the second vertical plate 222. In this way, the protrusions 2211 on the first vertical plate 221 and the second vertical plate 222 not only increase the heat transfer area between the first vertical plate 221, the second vertical plate 222 and the vertical pipe segments 211, but also realize heat conduction between the first vertical plate 221 and the second vertical plate 222, thereby ensuring that the first vertical plate 221 and the second vertical plate 222 have close cooling effects on the first battery module 31 and the second battery module 32, respectively.

[0083] The vertical pipe segments 211 include a plurality of pipe segment gaps distributed in the height direction (i.e., the thickness direction of the first bottom plate 223) of the liquid cooling plate 20. The protrusions 2211 on the first vertical plate 221 and the protrusions 2211 on the second vertical plate 222 can be located in different pipe segment gaps or the same pipe segment gap.

[0084] Optionally, the protrusions 2211 on the first vertical plate 221 abut against the protrusions 2211 on the second vertical plate 222. In this way, the protrusions 2211 on the first vertical plate 221 and the second vertical plate 222 not only increase the heat transfer area between the first vertical plate 221, the second vertical plate 222 and the vertical pipe segments 211, but also realize heat conduction between the first vertical plate 221 and the second vertical plate 222, thereby ensuring that the first vertical plate 221 and the second vertical plate 222 have close cooling effects on the first battery module 31 and the second battery module 32, respectively.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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, The application relates to a liquid cooling device, which comprises the following parts: a cold pipe (21) in an integrated bending structure, which comprises a vertical pipe section (211) and a first bottom pipe section (212) and a second bottom pipe section (213) connected on both sides of the vertical pipe section (211); a cold plate assembly (22) comprising a first vertical plate (221), a second vertical plate (222), a first bottom plate (223) and a second bottom plate (224), wherein the first vertical plate (221) and the second vertical plate (222) are respectively arranged on both sides of the vertical pipe section (211) and are fixedly connected with the vertical pipe section (211), and the first bottom plate (223) and the second bottom plate (224) are fixedly connected with the first bottom pipe section (212) and the second bottom pipe section (213) respectively.

2. The liquid cold plate of claim 1, wherein, The vertical pipe section (211) comprises a first pipe section (2111), a second pipe section (2112) and an elastic pipe section (2113). The elastic pipe section (2113) is communicated with the first pipe section (2111) and the second pipe section (2112), and the first pipe section (2111) and the second pipe section (2112) are communicated with the first bottom pipe section (212) and the second bottom pipe section (213) respectively. The first vertical plate (221) and the second vertical plate (222) are both flat plates and are fixedly connected with the first pipe section (2111) and the second pipe section (2112) respectively.

3. The liquid cold plate of claim 2, wherein, The plane where the first pipe section (2111) is located is arranged to be non-coplanar with the plane where the second pipe section (2112) is located.

4. The liquid cold plate of claim 1, wherein, The opposite surfaces of the first vertical plate (221) and the second vertical plate (222) are both provided with protrusions (2211), and the protrusions (2211) are filled in the pipe section gap of the vertical pipe section (211).

5. The liquid cold plate of claim 4, wherein, The protrusions (2211) on the first vertical plate (221) and the protrusions (2211) on the second vertical plate (222) are distributed in a staggered mode, and the height of the protrusions (2211) is equal to the spacing between the opposite surfaces of the first vertical plate (221) and the second vertical plate (222).

6. The liquid cold plate of claim 4, wherein, The protrusions (2211) on the first vertical plate (221) and the protrusions (2211) on the second vertical plate (222) are in abutment.

7. The liquid cold plate of claim 1, wherein, The liquid cooling plate (20) comprises a first supporting piece (225); The first supporting piece (225) is located in the pipe section gap of the first bottom pipe section (212) and is fixedly connected with the first bottom plate (223), and the first supporting piece (225) protrudes from the first bottom pipe section (212) in a direction away from the first bottom plate (223).

8. The liquid cold plate of claim 1, wherein, The first vertical plate (221) and the second vertical plate (222) are both provided with stress release cracks penetrating through.

9. The liquid cold plate of claim 8, wherein, The stress release cracks comprise a first crack (2213) and a plurality of second cracks (2214); The plurality of second cracks (2214) are distributed in a spaced mode along the length direction of the first crack (2213), and each second crack (2214) intersects with the first crack (2213).

10. An energy storage device, characterized by, The application also relates to a battery box (10). ​ The liquid cooling plate (20) according to any one of claims 1-9 is located at the bottom of the battery box (10), and the liquid cooling plate (20) comprises a vertical pipe section (211) erected in the battery box (10); A plurality of battery modules (30) are contained in the battery box (10), and at least include a first battery module (31) and a second battery module (32), the first battery module (31) and the second battery module (32) are respectively supported on the first bottom plate (223) and the second bottom plate (224).

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

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