Liquid cooling plate, energy storage device and energy storage system

Abstract

The present application discloses a liquid cooling plate, an energy storage device and an energy storage system, which relate to the field of battery cooling technology. The liquid cooling plate comprises: a vertical plate, a first bottom plate and a second bottom plate located on both sides of the vertical plate, the first bottom plate, the second bottom plate and the vertical plate are an integrated bent structure, and there is a bending portion between the first bottom plate and the vertical plate, and there is a first connecting section between the second bottom plate and the vertical plate; the flow channel of the bending portion is connected to the flow channel of the first bottom plate and the flow channel of the vertical plate, and the flow channel of the first connecting section is connected to the flow channel of the second bottom plate and the flow channel of the vertical plate.

Description

Technical Field

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

[0002] Rechargeable batteries, also known as rechargeable batteries or storage batteries, are batteries that can be recharged to activate the active materials and continue to be used after being discharged. The recyclable nature of secondary batteries has made them gradually become the main source of power for electrical equipment. As the demand for secondary batteries gradually increases, people's requirements for their performance in all aspects are also getting higher and higher.

[0003] In the related art, the energy storage device includes a battery case, a liquid cooling plate and a battery module. The liquid cooling plate is located at the bottom of the battery case, and the battery module composed of secondary batteries is supported on the liquid cooling plate, so that the secondary batteries are cooled at the bottom of the battery module by the liquid cooling plate to ensure the charging and discharging performance of the secondary batteries.

[0004] However, as the charge and discharge rates of the secondary battery increase, the heat generated by the secondary battery also increases, so the liquid cooling plate in the related art is difficult to meet the requirements of effective cooling of the secondary battery. Summary of the invention

[0005] A main purpose of the present application is to provide a liquid cooling plate, an energy storage device and an energy storage system that effectively improve the cooling effect.

[0006] In order to achieve the above application purpose, this application adopts the following technical solutions:

[0007] According to one aspect of the present application, a liquid cooling plate is provided, comprising: an upright vertical plate, and a first bottom plate and a second bottom plate respectively located on both sides of the vertical plate; the first bottom plate, the second bottom plate and the vertical plate are an integrally bent structure, and a bending portion is provided between the first bottom plate and the vertical plate, and a first connecting section is provided between the second bottom plate and the vertical plate; the flow channel of the bending portion is respectively connected to the flow channel of the first bottom plate and the flow channel of the vertical plate, the first connecting section is located at the first end of the liquid cooling plate in the first direction, and the flow channel of the first connecting section is respectively connected to the flow channel of the second bottom plate and the flow channel of the vertical plate.

[0008] In the implementation manner of the present application, for the liquid cooling plate including the bottom plate and the vertical plate, when the battery module is supported on the liquid cooling plate, the battery module can be cooled on multiple sides at the bottom and side surfaces of the battery module through the bottom plate and the vertical plate, thereby improving the cooling effect on the battery module; in addition, the liquid cooling plate is obtained by an integral bending manner, thereby avoiding the provision of a connecting joint on the liquid cooling channel, thereby avoiding leakage of the liquid cooling plate, and at the same time simplifying the manufacturing process of the liquid cooling plate, thereby facilitating improving the manufacturing efficiency of the liquid cooling plate.

[0009] According to one embodiment of the present application, the vertical plate has a first notch; the first notch is located at the first end of the vertical plate in the first direction of the liquid cooling plate, and is located away from the corner of the first bottom plate; the first notch has an intersecting first edge and a second edge, the first connecting section is connected to the first edge, and the length of the second edge is greater than 1 / 2 of the size of the vertical plate in the second direction of the liquid cooling plate.

[0010] In an embodiment of the present application, the length of the second edge is set to be greater than 1 / 2 of the size of the vertical plate in the second direction, that is, the length of the first connecting section after flattening is greater than 1 / 2 of the size of the vertical plate in the second direction, thereby ensuring that when the liquid cooling plate is bent, the second bottom plate can be bent to a position in the same plane as the first bottom plate.

[0011] According to one embodiment of the present application, the vertical plate has a first notch, and the second bottom plate has a second notch; the first notch is located at the first end of the vertical plate in the first direction of the liquid cooling plate, and is located at a corner away from the first bottom plate, and the second notch is located at the same end as the first notch, and is located close to the corner of the vertical plate; the first notch has an intersecting first edge and a second edge, and the second notch has an intersecting third edge and a fourth edge, the two ends of the first connecting section are respectively connected to the first edge and the third edge, and the sum of the lengths of the second edge and the fourth edge is greater than 1 / 2 of the size of the vertical plate in the second direction of the liquid cooling plate.

[0012] In the implementation mode of the present application, the length of the second edge and the fourth edge is set to be greater than 1 / 2 of the size of the vertical plate in the second direction, that is, the length of the first connecting section after flattening is greater than 1 / 2 of the size of the vertical plate in the second direction, thereby ensuring that when the liquid cooling plate is bent, the second bottom plate can be bent to a position in the same plane as the first bottom plate.

[0013] According to an embodiment of the present application, a second connecting section located at a second end in the first direction of the liquid cooling plate is provided between the second bottom plate and the vertical plate, and the second connecting section is respectively connected to the second bottom plate and the vertical plate.

[0014] In the implementation manner of the present application, multi-point connection between the second bottom plate and the vertical plate is achieved through the provision of the second connecting section, thereby ensuring the connection strength between the second bottom plate and the vertical plate and ensuring the stability of the overall structure of the liquid cooling plate.

[0015] According to one embodiment of the present application, one of the first base plate and the second base plate is provided with a water inlet joint, and the other is provided with a water outlet joint; the water inlet joint and the water outlet joint are located at the first end of the liquid cooling plate in the first direction.

[0016] In the embodiment of the present application, the water inlet joint and the water outlet joint are both located at the first end of the liquid cooling plate in the first direction (that is, at the same end as the first connecting section) to save the supporting space of the liquid cooling plate for the battery module, thereby ensuring effective use of the space in the battery box.

[0017] According to one embodiment of the present application, the surface of the vertical plate close to the first bottom plate is a plane, the surface of the vertical plate close to the second bottom plate is a concave-convex surface, the first bottom plate has a water outlet joint, and the second bottom plate has a water inlet joint.

[0018] In the embodiment of the present application, the first bottom plate is provided with a water outlet joint, and the second bottom plate is provided with a water inlet joint, so that the bottom surface cooling effect of the first battery module on the first bottom plate is worse than the bottom surface cooling effect of the second battery module on the second bottom plate, and then combined with the side cooling effect of the first battery module being better than the side cooling effect of the second battery module, it is ensured that the overall cooling effect of the liquid cooling plate on the first and second battery modules is close.

[0019] According to one embodiment of the present application, the flow channel length of the first bottom plate is smaller than the flow channel length of the second bottom plate.

[0020] According to an embodiment of the present application, the length of the first connecting section after being flattened is greater than or equal to 2 / 3 of the dimension of the vertical plate in the second direction of the liquid cooling plate.

[0021] In the implementation manner of the present application, a longer first connecting section is provided to reduce the difficulty of bending the first connecting section while ensuring that the second bottom plate is bent to be coplanar with the first bottom plate, thereby improving the bending efficiency of the liquid cooling plate.

[0022] According to one embodiment of the present application, the first connecting section includes a plurality of arc segments, and the plurality of arc segments include at least one convex segment and at least one concave segment; the at least one convex segment and the at least one concave segment can be deformed under external force to adjust the position of the second base plate in the second direction and / or third direction of the liquid cooling plate.

[0023] In the embodiment of the present application, by providing at least one raised section and at least one recessed section on the first connecting section, it is convenient to adjust the raised degree of the raised section and / or the recessed degree of the recessed section, thereby achieving adjustment of the position of the second base plate in the second direction and / or the third direction of the liquid cooling plate.

[0024] According to an embodiment of the present application, the bending portion is a block structure and is located at the second end of the liquid cooling plate in the first direction.

[0025] In the implementation manner of the present application, a bending portion with a block structure is provided to reduce resistance during bending, thereby improving the bending efficiency of the bending portion.

[0026] According to an embodiment of the present application, there are a plurality of bending portions between the first bottom plate and the vertical plate, and the plurality of bending portions are distributed at intervals along the first direction of the liquid cooling plate.

[0027] In the implementation manner of the present application, by providing a plurality of bending portions, it is convenient to reduce the bending resistance of the bending portions while improving the stability of the connection between the first bottom plate and the vertical plate.

[0028] According to one aspect of the present application, there is provided an energy storage device, comprising:

[0029] A battery case; the liquid cooling plate described in the above aspect is located at the bottom of the battery case, and the liquid cooling plate includes a vertical plate upright in the battery case; a plurality of battery modules are accommodated in the battery case, and include at least a first battery module and a second battery module, the first battery module and the second battery module are located on both sides of the vertical plate, the first battery module and the second battery module are simultaneously attached to the vertical plate, and are respectively attached to the first bottom plate and the second bottom plate.

[0030] According to one aspect of the present application, there is provided an energy storage system, comprising the energy storage device described in the above aspect.

[0031] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and other features and advantages of the present application will become more apparent by describing in detail example embodiments thereof with reference to the attached drawings.

[0033] Figure 1 is a schematic diagram of an energy storage system according to an exemplary embodiment.

[0034] Figure 2 is a schematic diagram of a partial explosion structure of an energy storage device according to an exemplary embodiment.

[0035] Figure 3 is a schematic diagram of the axial structure of a liquid cooling plate according to an exemplary embodiment.

[0036] Figure 4 is a schematic structural diagram of a liquid cooling plate before bending according to an exemplary embodiment.

[0037] Figure 5 is a schematic diagram of the axial structure of a liquid cooling plate according to an exemplary embodiment.

[0038] Figure 6 is a schematic diagram of the axial structure of another liquid cooling plate according to an exemplary embodiment.

[0039] Figure 7 is a schematic structural diagram of another liquid cooling plate before bending according to an exemplary embodiment.

[0040] Figure 8 yes Figure 3 A schematic diagram of the partial enlarged structure of the liquid cooling plate shown.

[0041] Fig. 9 is a schematic diagram of the axial structure of another liquid cooling plate according to an exemplary embodiment.

[0042] Fig.10 is a schematic diagram of the axial structure of another liquid cooling plate according to an exemplary embodiment.

[0043] Fig.11 is a schematic structural diagram of another liquid cooling plate before bending according to an exemplary embodiment.

[0044] Fig.12 is a schematic structural diagram of another liquid cooling plate before bending according to an exemplary embodiment.

[0045] Fig.13 yes Figure 5 A schematic diagram of the partial enlarged structure of the liquid cooling plate shown.

[0046] The reference numerals are described as follows:

[0047] 100, energy storage device; 200, electric energy conversion device; 300, user load;

[0048] 10. Battery box; 20. Liquid cooling plate; 30. Battery module;

[0049] 31. A first battery module; 32. A second battery module;

[0050] 20a, first end; 20b, second end;

[0051] 21. vertical plate; 22. first bottom plate; 23. second bottom plate; 24. bending portion; 25. first connecting section; 26. second connecting section; 27. water inlet joint; 28. water outlet joint;

[0052] 211, first notch; 212, first edge; 213, second edge; 214, plane; 215, concave-convex surface;

[0053] 231, second notch; 232, third edge; 233, fourth edge;

[0054] 251, arc segment; 252, convex segment; 253, concave segment. DETAILED DESCRIPTION

[0055] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this application will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted.

[0056] Since the energy people need is highly temporal and spatial, in order to rationally utilize energy and improve utilization, it is necessary to use a medium or device to store one form of energy in the same energy form, or convert it into another form of energy, and then release it in a specific energy form based on future applications.

[0057] At present, green energy mainly includes solar energy, wind energy, etc., which generally have problems of strong intermittency and large volatility, which will cause unstable voltage of the green power grid (not enough electricity during peak hours and too much electricity during low hours). Unstable voltage will cause damage to electricity. Therefore, it may cause the problem of "wind and solar power abandonment" due to insufficient electricity demand or insufficient grid acceptance capacity.

[0058] To solve the problem of insufficient electricity demand or insufficient grid acceptance capacity, we must rely on energy storage devices. That is, the energy storage device converts electrical energy into other forms of energy through physical or chemical means and stores it, and then converts the energy stored in the energy storage device into electrical energy when needed. In simple terms, the energy storage device is similar to a large "power bank", which stores electrical energy when there is sufficient light energy and wind energy, and releases the stored electrical energy when needed.

[0059] At present, energy storage (i.e. energy storage) has a wide range of application scenarios, including power 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:

[0060] (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, achieve load matching of electric energy in time and space, enhance the ability to absorb renewable energy, and are of great significance in grid system backup, relieving peak load power supply pressure, and peak and frequency regulation;

[0061] (2) The main operating mode of small and medium-sized energy storage cabinets used in industrial and commercial energy storage scenarios (banks, shopping malls, etc.) on the user side and small household energy storage boxes used in home energy storage scenarios on the user side is "peak shaving and valley filling". Since there is a large price difference in electricity charges at peak and valley locations according to electricity demand, after users have energy storage equipment, in order to reduce costs, they usually charge the energy storage device (energy storage cabinet / box) during the low electricity price period; during the peak electricity price period, the electricity in the energy storage device is discharged for use to achieve the purpose of saving electricity bills. In addition, in remote areas and areas prone to natural disasters such as earthquakes and hurricanes, the existence of household energy storage devices is equivalent to users providing themselves and the power grid with backup power, eliminating the inconvenience caused by frequent power outages due to disasters or other reasons.

[0062] An embodiment of the present application provides an energy storage system, which includes an energy storage device to store or supply electric energy through the energy storage device.

[0063] Taking the household energy storage scenario in user-side energy storage as an example, Figure 1 A schematic diagram of an energy storage system provided by an embodiment of the present application is shown, the energy storage system 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, household appliances, etc.), the electric energy conversion device 200 is electrically connected to the energy storage device 100, the energy storage device 100 is electrically connected to the user load 300, and the energy storage device 100 is a small energy storage box that can be mounted on an outdoor wall by wall hanging. Specifically, the electric energy conversion device 200 can convert solar energy into electric energy, and store it through the energy storage device 100, and then supply the user load 300 for use when the electricity price is peak, or supply the user load 300 for use when the power grid is off / power outage.

[0064] Among them, the energy storage device 100 can be a battery pack, a battery box, a battery system, etc. composed of battery cells. The battery cells can be secondary batteries such as lithium-ion batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, magnesium-ion batteries, and the battery cells can be cylindrical, flat, rectangular, etc., and the implementation methods of the present application are not limited to this. In addition, the battery cells can utilize the chemical reaction or change of the energy storage medium (chemical elements) to realize the charging and discharging process. Simply put, the electric energy generated by light energy and wind energy is stored in the battery cells through the chemical reaction or change of the energy storage medium. When the use of external electric energy reaches a peak, the electric energy stored in the battery cells is released for use through the chemical reaction or change of the energy storage medium, or transferred for use.

[0065] In some embodiments, Figure 2 As shown, the energy storage device 100 includes a battery case 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 case 10 , and the plurality of battery modules 30 are accommodated in the battery case 10 .

[0066] The battery box 10 includes a lower box and a box cover (not shown in the figure), and the box cover is fixedly connected to the lower box to enclose a battery compartment, and a plurality of battery modules 30 are located in the battery compartment.

[0067] The battery module 30 includes a pair of fixed end plates arranged opposite to each other, and a plurality of battery cells located between the pair of fixed end plates. The plurality of battery cells and the pair of fixed end plates can be fixed by binding tools such as cable ties.

[0068] In the related art, the liquid cooling plate 20 is arranged at the bottom of the plurality of battery modules 30 to perform heat exchange at the bottom of the battery cells to achieve cooling of the battery cells. However, as the charge and discharge rate of the battery cells increases, the heat generation of the battery cells also increases accordingly. When cooling is performed only at the bottom of the battery cells, it is difficult to ensure that the battery cells operate at a suitable temperature.

[0069] The embodiment of the present application provides a liquid cooling plate 20 , which includes a multi-faceted cooling structure consisting of a bottom plate and vertical plates 21 .

[0070] Among them, the bottom plate and the vertical plate 21 are alternately distributed in the third direction Y of the liquid cooling plate 20 (i.e., the width direction of the battery box 10, the width direction of the liquid cooling plate 20, and the thickness direction of the vertical plate 21), and the number of vertical plates 21 and the number of bottom plates can be specifically set according to the number of columns of the battery module 30. For example, two columns of battery modules 30 are arranged in the battery box 10, in which case the number of vertical plates 21 can be one, the number of bottom plates can be two, and a column of battery modules 30 is respectively arranged on both sides of the vertical plates 21; or four columns of battery modules 30 are arranged in the battery box 10, in which case the number of vertical plates 21 can be two, the number of bottom plates can be three, and a column of battery modules 30 is respectively arranged on both sides of each vertical plate 21, and two columns of battery modules 30 are supported on a bottom plate located between the two vertical plates 21; or four columns of battery modules 30 are arranged in the battery box 10, in which case the number of vertical plates 21 can be five, the number of bottom plates can be four, and so on, and a column of battery modules 30 is arranged between any two adjacent vertical plates 21.

[0071] In this way, the bottom of the battery module 30 can be cooled through the bottom plate, and the side of the battery module 30 can be cooled through the vertical plate 21, thereby increasing the heat exchange area between the liquid cooling plate 20 and the battery module 30 and improving the cooling effect on the battery module 30.

[0072] For example, Figure 2 As shown, the liquid cooling plate 20 includes a vertical plate 21, and a first bottom plate 22 and a second bottom plate 23 located on both sides of the vertical plate 21. The multiple battery modules 30 include at least a first battery module 31 and a second battery module 32. When assembling the energy storage device 100, the liquid cooling plate 20 is located at the bottom of the battery box 10, and the vertical plate 21 included in the liquid cooling plate 20 is upright in the battery box 10. The first battery module 31 and the second battery module 32 are located on both sides of the vertical plate 21. The first battery module 31 and the second battery module 32 are simultaneously attached to the vertical plate 21, and are respectively attached to the first bottom plate 22 and the second bottom plate 23.

[0073] In some embodiments, Figure 3 and Figure 4As shown, the liquid cooling plate 20 includes: an upright vertical plate 21, and a first bottom plate 22 and a second bottom plate 23 respectively located on both sides of the vertical plate 21; the first bottom plate 22, the second bottom plate 23 and the vertical plate 21 are an integrally bent structure, and a bending portion 24 is provided between the first bottom plate 22 and the vertical plate 21, and a first connecting section 25 is provided between the second bottom plate 23 and the vertical plate 21; the flow channel of the bending portion 24 is respectively connected to the flow channel of the first bottom plate 22 and the flow channel of the vertical plate 21, the first connecting section 25 is located at the first end 20a of the liquid cooling plate 20 in the first direction X (i.e., the length direction of the battery box 10, the arrangement direction of the battery cells in the battery module 30, and the width direction of the liquid cooling plate 20), and the flow channel of the first connecting section 25 is respectively connected to the flow channel of the second bottom plate 23 and the flow channel of the vertical plate 21.

[0074] In this way, a liquid cooling plate 20 including a vertical plate 21, a first bottom plate 22, and a second bottom plate 23 is obtained by an integrated bending method. On the basis of realizing multi-sided (bottom and side) cooling of the battery module 30, the setting of connecting joints on the liquid cooling channel is avoided, thereby avoiding leakage of the liquid cooling plate 20. At the same time, the manufacturing process of the liquid cooling plate 20 is simplified, which is convenient for improving the manufacturing efficiency of the liquid cooling plate 20.

[0075] Among them, the vertical plate 21, the first bottom plate 22, the second bottom plate 23, the bending portion 24, and the first connecting section 25 are an integrated structure, and the relative positions of the vertical plate 21, the first bottom plate 22, and the second bottom plate 23 are adjusted by bending the bending portion 24 and the first connecting section 25 to complete the production of the liquid cooling plate 20. After the liquid cooling plate 20 is bent, the vertical plate 21 and the first bottom plate 22 form a first angle, and the vertical plate 21 and the second bottom plate 23 form a second angle, and the first angle and the second angle can both be angles greater than or equal to 85 degrees and less than or equal to 95 degrees. For example, the planes where the first bottom plate 22 and the second bottom plate 23 are located are parallel, and the planes where the first bottom plate 22 and the second bottom plate 23 are located are both perpendicular to the plane where the vertical plate 21 is located, that is, the first angle between the vertical plate 21 and the first bottom plate 22, and the second angle between the vertical plate 21 and the second bottom plate 23 are both 90 degrees.

[0076] The bending portion 24 connecting the first bottom plate 22 and the vertical plate 21 may be a strip structure, that is, the size of the bending portion 24 in the first direction X of the liquid cooling plate 20 is equal to or slightly smaller than the length of the first bottom plate 22; or Figure 4 or Figure 5As shown, the bending portion 24 is a block structure, and is located at the second end 20b of the liquid cooling plate 20 in the first direction X. The block structure of the bending portion 24 is convenient for reducing the resistance during bending, thereby improving the bending efficiency of the bending portion 24. Of course, there may also be multiple bending portions 24 between the first bottom plate 22 and the vertical plate 21, and the multiple bending portions 24 are spaced apart along the first direction X of the liquid cooling plate 20. In this way, by providing multiple bending portions 24, it is convenient to simplify the bending of the bending portion 24 while improving the stability of the connection between the first bottom plate 22 and the vertical plate 21.

[0077] Among them, the liquid cooling plate 20 also includes a water inlet joint 27 and a water outlet joint 28, one of the water inlet joint 27 and the water outlet joint 28 is arranged on the second bottom plate 23, and the other is arranged on the first bottom plate 22. The water inlet joint 27 and the water outlet joint 28 can be located at the same end of the second bottom plate 23 and the first bottom plate 22 in the first direction X of the liquid cooling plate 20, so as to facilitate the connection of the water inlet joint 27 and the water outlet joint 28 with the external connecting pipeline.

[0078] For example, Figure 5 As shown, the water inlet joint 27 and the water outlet joint 28 are both located at the second end 20b of the liquid cooling plate 20 in the first direction X, or as shown in FIG. Figure 6 As shown, the water inlet joint 27 and the water outlet joint 28 are both located at the first end 20a of the liquid cooling plate 20 in the first direction X. When the water inlet joint 27 and the water outlet joint 28 are both located at the first end 20a of the liquid cooling plate 20 in the first direction X (i.e., located at the same end as the first connecting section 25), the supportable space of the liquid cooling plate 20 for the battery module 30 can be saved, thereby ensuring the effective use of the space in the battery box 10. For example, in the third direction Y of the liquid cooling plate 20, the water inlet joint 27, the water outlet joint 28, and the first connecting section 25 have overlapping areas, thereby further saving the supportable space of the liquid cooling plate 20 for the battery module 30.

[0079] It should be noted that Figure 5 and Figure 6 It is shown that the water inlet joint 27 and the water outlet joint 28 are located on the second bottom plate 23 and the first bottom plate 22 in the second direction Z of the liquid cooling plate 20 (i.e., the height direction of the battery cells in the battery module 30, the thickness direction of the second bottom plate 23 and the first bottom plate 22 respectively). Of course, the water inlet joint 27 and the water outlet joint 28 can also be located on the side of the edge of the second bottom plate 23 and the first bottom plate 22, as long as they can be connected to the external pipeline, and the implementation method of the present application does not limit this.

[0080] In some embodiments, the liquid cooling plate 20 is usually obtained by a stamping and brazing process before bending, that is, the liquid cooling plate 20 includes a first cover plate and a second cover plate, the first cover plate is stamped with a concave and convex structure, and the second cover plate is a flat structure. After the first cover plate and the second cover plate are covered, they are fixedly connected at the edge position by a welding process to form a flow channel between the first cover plate and the second cover plate.

[0081] Due to the manufacturing process of the liquid cooling plate 20 , one side surface of the first bottom plate 22 , the second bottom plate 23 , and the vertical plate 21 are all flat surfaces 214 , and the other side surfaces are all concave-convex surfaces 215 .

[0082] Among them, for the first bottom plate 22 and the second bottom plate 23 included in the liquid cooling plate 20, the side surface of the first bottom plate 22 and the second bottom plate 23 close to the vertical plate 21 can be a plane 214, thereby increasing the contact area between the first bottom plate 22, the second bottom plate 23 and the battery module 30, while ensuring that the heat exchange efficiency of the battery module 30 at the bottom is close.

[0083] Among them, for the vertical plate 21 included in the liquid cooling plate 20, since the two side surfaces (the flat surface 214 and the concave-convex surface 215) of the vertical plate 21 need to contact the side surfaces of the two battery modules 30 respectively, the contact area between the vertical plate 21 and the first battery module 31 and the second battery module 32 on both sides is different, which causes the vertical plate 21 to have different cooling effects on the first battery module 31 and the second battery module 32.

[0084] Optionally, a water inlet joint 27 is provided on the bottom plate near the concave-convex surface 215 of the vertical plate 21, and a water outlet joint 28 is provided on the bottom plate near the plane 214 of the vertical plate 21. At this time, the coolant can first cool the battery module 30 near the concave-convex surface 215 of the vertical plate 21, and then cool the battery module 30 near the plane 214 of the vertical plate 21, so that the bottom surface cooling effects of the two battery modules 30 on both sides of the vertical plate 21 are different, specifically, the bottom surface cooling effect of one battery module 30 is better, and the side cooling effect is worse, and the bottom surface cooling effect of the other battery module 30 is worse, and the side cooling effect is better, so as to ensure that the overall cooling effects of the first and second battery modules 32 on the bottom and side are similar.

[0085] For example, Figure 5 and Figure 6As shown, the surface of the vertical plate 21 close to the first bottom plate 22 is a plane 214, the surface of the vertical plate 21 close to the second bottom plate 23 is a concave-convex surface 215, the first bottom plate 22 has a water outlet joint 28, and the second bottom plate 23 has a water inlet joint 27. At this time, the battery module 30 on the first bottom plate 22 is the first battery module 31, and the battery module 30 on the second bottom plate 23 is the second battery module 32. The bottom surface cooling effect of the first battery module 31 is worse than the bottom surface cooling effect of the second battery module 32, but the side surface cooling effect of the first battery module 31 is better than the side surface cooling effect of the second battery module 32, thereby ensuring the uniformity of the overall cooling of the first battery module 31 and the second battery module 32 by the liquid cooling plate 20.

[0086] It should be noted that when the water inlet connector 27 is set on the second bottom plate 23, the overall cooling effect of the bottom and sides of the first battery module 31 on the first bottom plate 22 may be close to the overall cooling effect of the bottom and sides of the second battery module 32 on the second bottom plate 23; of course, there may still be a gap between the overall cooling effect of the bottom and sides of the first battery module 31 and the overall cooling effect of the bottom and sides of the second battery module 32, for example, the overall cooling effect of the bottom and sides of the first battery module 31 is still better than the overall cooling effect of the bottom and sides of the second battery module 32, or the overall cooling effect of the bottom and sides of the first battery module 31 is worse than the overall cooling effect of the bottom and sides of the second battery module 32.

[0087] When the overall cooling effect of the first battery module 31 is better than that of the second battery module 32, the flow channel length of the first bottom plate 22 may be shorter than that of the second bottom plate 23. In this way, by extending the flow channel of the second bottom plate 23, the cooling time of the second bottom plate 23 on the second battery module 32 is increased, thereby further improving the bottom surface cooling effect of the second battery module 32 on the second bottom plate 23, thereby ensuring that the overall cooling effects of the first battery module 31 and the second battery module 32 on the bottom and side surfaces are similar.

[0088] For example, the flow channel of the first bottom plate 22 is a straight flow channel, and the flow channel on the second bottom plate 23 is a U-shaped flow channel. At this time, since the flow channel on the second bottom plate 23 is connected to the flow channel on the vertical plate 21 through the flow channel of the first connecting section 25, the water inlet joint 27 on the second bottom plate 23 can be arranged near the first end 20a of the first connecting section 25, so that the two ports of the U-shaped flow channel are respectively connected to the water inlet joint 27 and the flow channel of the first connecting section 25.

[0089] When the overall cooling effect of the first battery module 31 is worse than that of the second battery module 32, the flow channel length of the first bottom plate 22 may be greater than that of the second bottom plate 23. In this way, by extending the flow channel of the first bottom plate 22, the cooling time of the first bottom plate 22 on the first battery module 31 is increased, thereby improving the cooling effect of the bottom surface of the first battery module 31 on the first bottom plate 22, thereby ensuring that the overall cooling effects of the first battery module 31 and the second battery module 32 on the bottom and side surfaces are similar.

[0090] For example, the flow channel of the first bottom plate 22 is a U-shaped flow channel, and the flow channel on the second bottom plate 23 is a straight flow channel. At this time, since the flow channel (straight flow channel) on the second bottom plate 23 is connected with the flow channel on the vertical plate 21 through the flow channel of the first connecting section 25, the water inlet joint 27 on the second bottom plate 23 can be arranged at the second end 20b away from the first connecting section 25, so that the two ends of the straight flow channel on the second bottom plate 23 are respectively connected with the water inlet joint 27 and the flow channel of the first connecting section 25.

[0091] In some embodiments, the vertical plate 21 has a first notch 211; the first notch 211 is located at the first end 20a of the vertical plate 21 in the first direction X of the liquid cooling plate 20, and is located at a corner away from the first bottom plate 22; the first notch 211 has an intersecting first edge 212 and a second edge 213, the first connecting section 25 is connected to the first edge 212, and the length of the second edge 213 is greater than 1 / 2 of the size of the vertical plate 21 in the second direction Z of the liquid cooling plate 20.

[0092] Among them, for the liquid cooling plate 20 described above, before bending, Figure 7 As shown, before the liquid cooling plate 20 is bent, the first connecting section 25, the second bottom plate 23 and the vertical plate 21 form an L-shaped gap. In addition, the first notch 211 can be a rectangular notch, in which case the first direction X of the first edge 212 is parallel to the first direction X of the liquid cooling plate 20, so as to facilitate connection with the first connecting section 25, the first direction X of the second edge 213 is parallel to the second direction Z of the liquid cooling plate 20, and the length of the first edge 212 and the length of the second edge 213 are close to the width and length of the first connecting section 25 after being flattened.

[0093] Among them, the length of the first edge 212 is greater than or equal to 15 mm and less than or equal to 30 mm, that is, the width of the first connecting section 25 after flattening is greater than or equal to 15 mm and less than or equal to 30 mm, so as to ensure the design of the flow channel on the first connecting section 25, and at the same time avoid the first connecting section 25 occupying a large space in the first direction X of the liquid cooling plate 20.

[0094] Among them, the length of the second edge 213 is greater than 1 / 2 of the size of the vertical plate 21 in the second direction Z, that is, the length of the first connecting section 25 after flattening is greater than 1 / 2 of the size of the vertical plate 21 in the second direction Z, thereby ensuring that when the liquid cooling plate 20 is bent, the second bottom plate 23 can be bent to a position in the same plane as the first bottom plate 22.

[0095] In other embodiments, Figure 3 and Figure 8 As shown, the vertical plate 21 has a first notch 211, and the second bottom plate 23 has a second notch 231; the first notch 211 is located at the first end 20a of the vertical plate 21 in the first direction X of the liquid cooling plate 20, and is located at a corner away from the first bottom plate 22, and the second notch 231 is located at the same end as the first notch 211, and is located near the corner of the vertical plate 21; the first notch 211 has an intersecting first edge 212 and a second edge 213, and the second notch 231 has an intersecting third edge 232 and a fourth edge 233, and the two ends of the first connecting section 25 are respectively connected to the first edge 212 and the third edge 232, and the sum of the lengths of the second edge 213 and the fourth edge 233 is greater than 1 / 2 of the size of the vertical plate 21 in the second direction Z of the liquid cooling plate 20.

[0096] Among them, for the liquid cooling plate 20 described above, before bending, Figure 4 As shown, before the liquid cooling plate 20 is bent, the first connecting section 25, the second bottom plate 23 and the vertical plate 21 form a T-shaped gap. In addition, the first notch 211 and the second notch 231 can be rectangular notches, at which time the first direction X of the first edge 212 and the first direction X of the third edge 232 are parallel to the first direction X of the liquid cooling plate 20, the length of the first edge 212 is equal to the length of the third edge 232, and is close to the width of the first connecting section 25 after flattening, so as to facilitate the connection between the first edge 212 and the third edge 232 and the first connecting section 25; the first direction X of the second edge 213 and the first direction X of the fourth edge 233 are parallel to the second direction Z of the liquid cooling plate 20, and the length of the second edge 213 and the fourth edge 233 is close to the length of the first connecting section 25 after flattening.

[0097] Among them, the length of the first edge 212 and the length of the third edge 232 are both greater than or equal to 15 mm and less than or equal to 30 mm, that is, the width of the first connecting section 25 after flattening is greater than or equal to 15 mm and less than or equal to 30 mm, so as to ensure the design of the flow channel on the first connecting section 25 and avoid the first connecting section 25 occupying a large space in the first direction X of the liquid cooling plate 20.

[0098] Among them, the sum of the lengths of the second edge 213 and the fourth edge 233 is greater than 1 / 2 of the size of the vertical plate 21 in the second direction Z, that is, the length of the first connecting section 25 after flattening is greater than 1 / 2 of the size of the vertical plate 21 in the second direction Z, thereby ensuring that when the liquid cooling plate 20 is bent, the second bottom plate 23 can be bent to a position in the same plane as the first bottom plate 22.

[0099] In some embodiments, Fig. 9 or Fig.10 As shown, a second connecting section 26 is provided between the second bottom plate 23 and the vertical plate 21 and is located at the second end 20 b in the first direction X of the liquid cooling plate 20 . The second connecting section 26 is connected to the second bottom plate 23 and the vertical plate 21 respectively.

[0100] Among them, through the provision of the second connecting section 26, a multi-point connection between the second bottom plate 23 and the vertical plate 21 is achieved, thereby ensuring the connection strength between the second bottom plate 23 and the vertical plate 21, and ensuring the stability of the overall structure of the liquid cooling plate 20. In addition, the second connecting section 26 is a connecting plate structure, that is, the second connecting section 26 is only used to achieve the connection between the second bottom plate 23 and the vertical plate 21, so as to avoid affecting the design of the flow channel communication between the second bottom plate 23 and the vertical plate 21.

[0101] In some embodiments, the vertical plate 21 has two first notches 211; the two first notches 211 are respectively located at the two ends of the vertical plate 21 in the first direction X of the liquid cooling plate 20, and are located at the corners away from the first bottom plate 22; the first notch 211 has an intersecting first edge 212 and a second edge 213, and the first connecting section 25 and the second connecting section 26 are respectively connected to the first edge 212 of the first notch 211.

[0102] Among them, for the liquid cooling plate 20 described above, before bending, Fig.11 As shown, before the liquid cooling plate 20 is bent, the first connecting section 25, the second connecting section 26, the second bottom plate 23 and the vertical plate 21 form a U-shaped gap. In addition, the shape of the first notch 211, the length of the first edge 212, and the second edge 213 can all refer to the above settings, and the embodiments of the present application will not be repeated.

[0103] In other embodiments, the vertical plate 21 has two first notches 211, and the second bottom plate 23 has two second notches 231; the two first notches 211 are respectively located at the two ends of the vertical plate 21 in the first direction X of the liquid cooling plate 20, and are located at the corners away from the first bottom plate 22, and the two second notches 231 are respectively located at the two ends of the vertical plate 21 in the first direction X of the liquid cooling plate 20, and are located near the corners of the vertical plate 21; the first notch 211 has an intersecting first edge 212 and a second edge 213, and the second notch 231 has an intersecting third edge 232 and a fourth edge 233, and the two ends of the first connecting section 25 are respectively connected to the first edge 212 of a first notch 211 and the third edge 232 of a second notch 231, and the two ends of the second connecting section 26 are respectively connected to the first edge 212 of another first notch 211 and the third edge 232 of another second notch 231.

[0104] Among them, for the liquid cooling plate 20 described above, before bending, Fig.12 As shown, before the liquid cooling plate 20 is bent, the first connecting section 25, the second connecting section 26, the second bottom plate 23 and the vertical plate 21 form an I-shaped gap. In addition, the shapes of the first notch 211 and the second notch 231, and the lengths of the first edge 212, the second edge 213, the third edge 232 and the fourth edge 233 can all refer to the above settings, and the embodiments of the present application will not be repeated.

[0105] In some embodiments, the length of the first connecting section 25 after being flattened is greater than or equal to 2 / 3 of the dimension of the vertical plate 21 in the second direction Z of the liquid cooling plate 20 .

[0106] Thus, a longer first connecting section 25 is provided to ensure that the second bottom plate 23 is bent to be coplanar with the first bottom plate 22 , thereby reducing the difficulty of bending the first connecting section 25 , thereby improving the bending efficiency of the liquid cooling plate 20 .

[0107] In some embodiments, Figure 5 and Fig.13 As shown, the first connecting section 25 includes a plurality of arc sections 251, and the plurality of arc sections 251 include at least one raised section 252 and at least one recessed section 253; at least one raised section 252 and at least one recessed section 253 can be deformed under external force to adjust the position of the second base plate 23 in the second direction Z and / or the third direction Y of the liquid cooling plate 20.

[0108] In this way, by setting at least one raised section 252 and at least one recessed section 253 on the first connecting section 25, it is convenient to adjust the raised degree of the raised section 252 and / or the recessed degree of the recessed section 253, so as to achieve the adjustment of the position of the second base plate 23 in the second direction Z and / or the third direction Y of the liquid cooling plate 20.

[0109] Specifically, when installing the battery module 30 on the liquid cooling plate 20, the first battery module 31 can be fixed in advance on the surface of the first bottom plate 22 facing the vertical plate 21 and the surface of the vertical plate 21 facing the first bottom plate 22, and then the second battery module 32 can be fixed on the surface of the vertical plate 21 facing the second bottom plate 23, while ensuring that the first battery module 31 and the second battery module 32 are at the same height, and then under the action of external force, the raised section 252 and / or the recessed section 253 on the first connecting section 25 are adjusted to ensure that the second bottom plate 23 and the second battery module 32 are tightly fitted, thereby ensuring the stability of the fixation of the second battery module 32.

[0110] It should be noted that when a second connecting section 26 is connected between the second base plate 23 and the vertical plate 21, the specific structure of the second connecting section 26 is the same as the specific structure of the first connecting section 25, so as to avoid the second connecting section 26 affecting the adjustment of the position of the second base plate 23 in the second direction Z and / or the third direction Y of the liquid cooling plate 20.

[0111] In the embodiments of the present application, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise expressly defined. Terms such as "installed", "connected", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill 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.

[0112] In the description of the implementation methods of the present application, it needs to be understood that the directions or positional relationships indicated by the terms "up", "down", "left", "right", "front", "back", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the implementation methods of the present application and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, cannot be understood as a limitation on the implementation methods of the present application.

[0113] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the implementation of the present application. In this specification, the schematic representation 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.

[0114] The above are only preferred embodiments of the implementation methods of the present application, and are not intended to limit the implementation methods of the present application. For those skilled in the art, the implementation methods of the present application may have various changes and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the implementation methods of the present application shall be included in the protection scope of the implementation methods of the present application.

Claims

1. A liquid cooling plate, characterized in that: include: An upright vertical plate (21), and a first bottom plate (22) and a second bottom plate (23) respectively located on both sides of the vertical plate (21); The first bottom plate (22), the second bottom plate (23) and the vertical plate (21) are an integrally bent structure, a bending portion (24) is provided between the first bottom plate (22) and the vertical plate (21), and a first connecting section (25) is provided between the second bottom plate (23) and the vertical plate (21); The flow channel of the bent portion (24) is respectively connected to the flow channel of the first bottom plate (22) and the flow channel of the vertical plate (21); the first connecting section (25) is located at the first end (20a) of the liquid cooling plate (20) in the first direction, and the flow channel of the first connecting section (25) is respectively connected to the flow channel of the second bottom plate (23) and the flow channel of the vertical plate (21); the first direction refers to the arrangement direction of the battery cells in the battery module; before the liquid cooling plate (20) is bent, the first connecting section (25), the second bottom plate (23) and the vertical plate (21) form a T-shaped gap; The bent portion (24) is connected to an edge of the vertical plate (21) close to the first bottom plate (22); the bent portion (24) is a block-shaped structure and is located at the second end (20b) of the liquid cooling plate (20) in the first direction; the vertical plate (21) has a first notch (211), and the second bottom plate (23) has a second notch (231); the first notch (211) is located at the first end (20a) of the vertical plate (21) in the first direction of the liquid cooling plate (20), and is located at a corner away from the first bottom plate (22); the second notch (231) is located at the first end (20a) of the vertical plate (21) in the first direction of the liquid cooling plate (20), and is located at a corner away from the first bottom plate (22); The first notches (211) are located at the same end and are located near the corner of the vertical plate (21); the first notch (211) has a first edge (212) and a second edge (213) that intersect, and the second notch (231) has a third edge (232) and a fourth edge (233) that intersect, and the two ends of the first connecting section (25) are respectively connected to the first edge (212) and the third edge (232), and the sum of the lengths of the second edge (213) and the fourth edge (233) is greater than 1 / 2 of the dimension of the vertical plate (21) in the second direction of the liquid cooling plate (20).

2. The liquid cooling plate according to claim 1, characterized in that: A second connecting section (26) is provided between the second bottom plate (23) and the vertical plate (21) and is located at the second end (20b) in the first direction of the liquid cooling plate (20), and the second connecting section (26) is respectively connected to the second bottom plate (23) and the vertical plate (21).

3. The liquid cooling plate according to claim 1, characterized in that: One of the first bottom plate (22) and the second bottom plate (23) is provided with a water inlet joint (27), and the other is provided with a water outlet joint (28); The water inlet joint (27) and the water outlet joint (28) are located at a first end (20a) of the liquid cooling plate (20) in a first direction.

4. The liquid cooling plate according to claim 1, characterized in that: The surface of the vertical plate (21) close to the first bottom plate (22) is a plane (214), the surface of the vertical plate (21) close to the second bottom plate (23) is a concave-convex surface (215), the first bottom plate (22) has a water outlet joint (28), and the second bottom plate (23) has a water inlet joint (27).

5. The liquid cooling plate according to claim 4, characterized in that: The flow channel length of the first bottom plate (22) is shorter than the flow channel length of the second bottom plate (23).

6. The liquid cooling plate according to any one of claims 1 to 5, characterized in that: The length of the first connecting section (25) after being flattened is greater than or equal to 2 / 3 of the dimension of the vertical plate (21) in the second direction of the liquid cooling plate (20).

7. The liquid cooling plate according to claim 6, characterized in that: The first connecting section (25) comprises a plurality of circular arc sections (251), and the plurality of circular arc sections (251) comprise at least one convex section (252) and at least one concave section (253); The at least one raised section (252) and the at least one recessed section (253) are capable of deforming under an external force, so as to adjust the position of the second bottom plate (23) in the second direction and / or the third direction of the liquid cooling plate (20).

8. An energy storage device, characterized in that: include: Battery box (10); The liquid cooling plate (20) according to any one of claims 1 to 7 is located at the bottom of the battery box (10), and the vertical plate (21) included in the liquid cooling plate (20) is vertically arranged in the battery box (10); A plurality of battery modules (30) are contained in the battery box (10), and include at least a first battery module (31) and a second battery module (32), wherein the first battery module (31) and the second battery module (32) are located on both sides of the vertical plate (21), and the first battery module (31) and the second battery module (32) are simultaneously attached to the vertical plate (21) and are respectively attached to the first bottom plate (22) and the second bottom plate (23).

9. An energy storage system, characterized in that: Comprising the energy storage device (100) as claimed in claim 8.

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