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, and relates to the field of battery cooling technology. The liquid cooling plate includes: a liquid cooling part, and a first bottom plate and a second bottom plate located on both sides of the liquid cooling part; the liquid cooling part includes a first vertical plate and a second vertical plate, the first vertical plate, the second vertical plate, the first bottom plate and the second bottom plate are an integrated bent structure, and there is a connecting part between the first vertical plate and the second vertical plate, there is a first bending part between the first vertical plate and the first bottom plate, and there is a second bending part between the second vertical plate and the second bottom plate; the flow channel of the connecting part is respectively connected to the flow channel of the first vertical plate and the flow channel of the second vertical plate, the flow channel of the first bending part is respectively connected to the flow channel of the first bottom plate and the flow channel of the first vertical plate, and the flow channel of the second bending part is respectively connected to the flow channel of the second bottom plate and the flow channel of the second 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: a vertical liquid cooling part, and a first bottom plate and a second bottom plate respectively located on both sides of the liquid cooling part; the liquid cooling part comprises a first vertical plate and a second vertical plate arranged opposite to each other, the first vertical plate, the second vertical plate, the first bottom plate and the second bottom plate are an integrally bent structure, and a connecting part is provided between the first vertical plate and the second vertical plate, a first bending part is provided between the first vertical plate and the first bottom plate, and a second bending part is provided between the second vertical plate and the second bottom plate; the flow channel of the connecting part respectively connects the flow channel of the first vertical plate and the flow channel of the second vertical plate, the flow channel of the first bending part respectively connects the flow channel of the first bottom plate and the flow channel of the first vertical plate, and the flow channel of the second bending part respectively connects the flow channel of the second bottom plate and the flow channel of the second vertical plate.

[0008] In the implementation manner of the present application, for the liquid cooling plate including a bottom plate and a 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 sides 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 integrated 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; furthermore, the surfaces of the first vertical plate and the second vertical plate facing the battery module can be set to be flat, so as to ensure the uniformity of cooling of the battery modules supported on the first bottom plate and the second bottom plate.

[0009] According to an embodiment of the present application, the liquid cooling plate further includes an elastic member, and the elastic member is located between the first vertical plate and the second vertical plate.

[0010] In the implementation mode of the present application, by setting the elastic member, elastic extrusion between the first vertical plate and the second vertical plate is achieved, which is convenient for absorbing the installation tolerance along the third direction of the liquid cooling plate when assembling the battery module; elastic buffering between the first vertical plate and the second vertical plate is also achieved, avoiding the situation where the connection part of the first vertical plate and / or the second vertical plate is broken when being impacted by external force.

[0011] According to an embodiment of the present application, the elastic member is elastic foam.

[0012] In the implementation manner of the present application, the first vertical plate, the second vertical plate and the elastic foam have a sufficiently large contact area, thereby increasing the reliability of the elastic buffer between the first vertical plate and the second vertical plate, while avoiding condensation on the opposite surfaces of the first vertical plate and the second vertical plate.

[0013] According to an embodiment of the present application, the connecting portion includes a first connecting section, and the first connecting section is located at a first end of the liquid cooling plate in the first direction.

[0014] In the implementation manner of the present application, for the first connecting section of the block structure, it is convenient to reduce the resistance during bending and improve the bending efficiency; at the same time, it is convenient to adjust the relative positions of the first vertical plate and the second vertical plate in the second direction of the liquid cooling plate by adjusting the height misalignment at both ends of the first connecting section, thereby ensuring that multiple battery modules are at the same height.

[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, and the water inlet joint, the water outlet joint and the first connecting section are located at the same end of the liquid cooling plate in the first direction.

[0016] In the embodiment of the present application, the water inlet joint, the water outlet joint, and the first connecting section are located at the same end, which can save the supporting space of the liquid cooling plate for the battery module in the first direction, thereby ensuring the effective use of the space in the battery box and reducing the waste caused by the liquid cooling plate.

[0017] According to an embodiment of the present application, the first bending portion and the second bending portion are both block structures, and are located at different ends of the liquid cooling plate in the first direction from the first connecting section.

[0018] In an embodiment of the present application, when the first bending portion, the second bending portion and the first connecting section are located at different ends of the liquid cooling plate in the first direction, the stability of the connection between the first vertical plate, the second vertical plate, the first bottom plate and the second bottom plate can be improved, that is, the stability of the overall structure of the liquid cooling plate can be improved.

[0019] According to one embodiment of the present application, the first vertical plate has a first notch, and the second vertical plate has a second notch; the first notch is located at the first end of the first vertical plate in the first direction of the liquid cooling plate, and is located away from the corner of the first bottom plate, and the second notch is located at the same end as the first notch, and is located away from the corner of the second bottom 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 lengths of the second edge and the fourth edge are both less than 1 / 2 of the size of the liquid cooling part in the second direction of the liquid cooling plate.

[0020] According to one embodiment of the present application, the first connecting section is a U-shaped structure when flattened, and both ends of the first connecting section are respectively connected to the edges of the first end of the first vertical plate and the second vertical plate in the first direction of the liquid cooling plate.

[0021] In an embodiment of the present application, a first connecting section may be provided in the first direction of the liquid cooling plate to protrude from the first bottom plate and the second bottom plate, thereby saving materials for the first vertical plate, the second vertical plate, the first bottom plate, and the second bottom plate, so as to reduce the space occupied by the liquid cooling plate at the first end, thereby facilitating improving the space utilization in the battery box.

[0022] According to one embodiment of the present application, the first connecting section is a semicircular ring structure after being flattened.

[0023] In the embodiment of the present application, a first connecting section with a semicircular ring structure is provided, which can further reduce the space occupied by the first connecting section after being bent, thereby further improving the space utilization rate in the battery box.

[0024] According to an embodiment of the present application, the connecting portion further includes a second connecting section, and the second connecting section is located at a second end of the liquid cooling plate in the first direction.

[0025] In the implementation manner of the present application, multi-point connection between the first vertical plate and the second vertical plate is achieved through the provision of the second connecting section, thereby ensuring the connection strength between the first vertical plate and the second vertical plate and ensuring the stability of the overall structure of the liquid cooling plate.

[0026] According to one embodiment of the present application, there are multiple first bending portions between the first vertical plate and the first bottom plate, and there are multiple second bending portions between the second vertical plate and the second bottom plate; the multiple first bending portions and the multiple second bending portions are spaced apart and distributed along the first direction of the liquid cooling plate.

[0027] In the embodiment of the present application, by providing a plurality of first bending portions and a plurality of second bending portions, it is convenient to improve the stability of the connection between the first bottom plate and the first vertical plate, and between the second bottom plate and the second vertical plate while simplifying the bending.

[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 part included in the liquid cooling plate is vertically arranged 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 liquid cooling part, the first battery module and the second battery module are respectively affixed to the first vertical plate and the second vertical plate, and are respectively affixed 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 yes Figure 3 Schematic diagram of the structure of the liquid cooling plate before bending.

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

[0038] Figure 6 yes Figure 5 A schematic diagram of the partial enlarged structure of the liquid cooling plate shown.

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

[0040] Figure 8 is a schematic structural diagram of another liquid cooling plate before bending according to an exemplary embodiment.

[0041] Fig. 9 yes Figure 7 The main structural schematic diagram of the liquid cooling plate after bending is shown.

[0042] Fig.10 yes Figure 8 The main structural schematic diagram of the liquid cooling plate after bending is shown.

[0043] Fig.11 is a schematic diagram of the axial structure of another liquid cooling plate according to an exemplary embodiment.

[0044] Fig.12 yes Fig.11 Schematic diagram of the structure of the liquid cooling plate before bending.

[0045] The reference numerals are described as follows:

[0046] 100, energy storage device; 200, electric energy conversion device; 300, user load;

[0047] 10. Battery box; 20. Liquid cooling plate; 30. Battery module;

[0048] 11. lower box; 31. first battery module; 32. second battery module;

[0049] 20a, first end; 20b, second end;

[0050] 21. Liquid cooling unit; 22. First bottom plate; 23. Second bottom plate; 24. Water inlet connector; 25. Water outlet connector; 26. Elastic member;

[0051] 211, first vertical plate; 212, second vertical plate; 213, first bending portion; 214, second bending portion; 215, connecting portion; 216, first connecting section; 217, second connecting section;

[0052] 2111, first notch; 2112, first edge; 2113, second edge;

[0053] 2121. Second gap; 2122. Third edge; 2123. Fourth edge. DETAILED DESCRIPTION

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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:

[0059] (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;

[0060] (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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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 .

[0065] 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 to the lower box 11 to enclose a battery compartment, and the liquid cooling plate 20 and multiple battery modules 30 are all located in the battery compartment.

[0066] 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.

[0067] 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.

[0068] The embodiment of the present application provides a liquid cooling plate 20 , which is a multi-faceted cooling structure composed of a liquid cooling portion 21 and a bottom plate.

[0069] The liquid cooling parts 21 and the bottom plates are alternately distributed in the third direction Y of the liquid cooling plate 20 (i.e., the width direction of the battery case 10, the width direction of the liquid cooling plate 20, and the thickness direction of the liquid cooling parts 21), and the number of the liquid cooling parts 21 and the number of the bottom plates can be specifically set according to the number of columns of the battery modules 30 along the third direction Y of the battery case 10. For example, two columns of battery modules 30 are arranged in the battery case 10 along the third direction Y of the battery case 10, in which case the number of the liquid cooling parts 21 can be one, and a column of battery modules 30 is arranged on both sides, respectively, and the number of the bottom plates can be two, and they are respectively located at the bottom of the two columns of battery modules 30; or four columns of battery modules 30 are arranged in the battery case 10, in which case the number of the liquid cooling parts 21 can be two, and a column of battery modules 30 is arranged on both sides of each liquid cooling part 21, respectively, and the number of the bottom plates can be three, and the two outermost bottom plates are respectively located at the bottom of the two outermost columns of battery modules 30, and the middle bottom plate is located at the bottom of the two middle columns of battery modules 30.

[0070] In this way, the bottom of the battery module 30 can be cooled by the bottom plate, and the side of the battery module 30 can be cooled by the liquid cooling part 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.

[0071] For example, Figure 2 As shown, the liquid cooling plate 20 includes a liquid cooling part 21, and a first bottom plate 22 and a second bottom plate 23 located on both sides of the liquid cooling part 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 case 10, and the liquid cooling part 21 included in the liquid cooling plate 20 is vertically arranged in the battery case 10. The first battery module 31 and the second battery module 32 are located on both sides of the liquid cooling part 21. The first battery module 31 and the second battery module 32 are simultaneously attached to the liquid cooling part 21, and are respectively attached to the first bottom plate 22 and the second bottom plate 23.

[0072] In some embodiments, Figure 3 and Figure 4As shown, the liquid cooling plate 20 includes: a vertical liquid cooling part 21, and a first bottom plate 22 and a second bottom plate 23 respectively located on both sides of the liquid cooling part 21; the liquid cooling part 21 includes a first vertical plate 211 and a second vertical plate 212 arranged opposite to each other, the first vertical plate 211, the second vertical plate 212, the first bottom plate 22 and the second bottom plate 23 are an integrated bent structure, and a connecting portion 215 is provided between the first vertical plate 211 and the second vertical plate 212, and the first vertical plate 211 and the second bottom plate 23 are connected to each other. A first bending portion 213 is provided between the first bottom plate 22, and a second bending portion 214 is provided between the second vertical plate 212 and the second bottom plate 23; the flow channel of the connecting portion 215 is respectively connected to the flow channel of the first vertical plate 211 and the flow channel of the second vertical plate 212, the flow channel of the first bending portion 213 is respectively connected to the flow channel of the first bottom plate 22 and the flow channel of the first vertical plate 211, and the flow channel of the second bending portion 214 is respectively connected to the flow channel of the second bottom plate 23 and the flow channel of the second vertical plate 212.

[0073] In this way, the liquid cooling plate 20 is obtained by an integrated bending method. On the basis of realizing multi-sided cooling of the battery module 30 through the first vertical plate 211 and the first bottom plate 22, the second vertical plate 212 and the second bottom plate 23, the setting of the connecting joint on the liquid cooling channel is avoided, thereby avoiding the leakage of the liquid cooling plate 20, and at the same time simplifying the manufacturing process of the liquid cooling plate 20, which is convenient for improving the manufacturing efficiency of the liquid cooling plate 20; in addition, the surfaces of the first vertical plate 211 and the second vertical plate 212 facing the battery module 30 can be set as planes, that is, the first vertical plate 211 and the first battery module 31, the second vertical plate 212 and the second battery module 32 have the same heat exchange area, thereby ensuring the uniformity of cooling of the first battery module 31 and the second battery module 32.

[0074] Among them, the first vertical plate 211, the second vertical plate 212, the first bottom plate 22, the second bottom plate 23, the first bending portion 213, the second bending portion 214, and the connecting portion 215 are an integrated structure, and the first bending portion 213, the second bending portion 214, and the connecting portion 215 are bent, and the bending angles of the first bending portion 213, the second bending portion 214, and the connecting portion 215 are adjusted to adjust the relative positions of the first vertical plate 211 and the first bottom plate 22, and the second vertical plate 212 and the second bottom plate 23, so as to complete the production of the liquid cooling plate 20. After the bending of the liquid cooling plate 20 is completed, the first vertical plate 211 and the first bottom plate 22 form a first angle, and the second vertical plate 212 and the second bottom plate 23 form a second angle, and the first angle and the second angle can be angles greater than or equal to 85 degrees and less than or equal to 95 degrees. For example, the planes where the first vertical plate 211 and the second vertical plate 212 are located are parallel, 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 perpendicular to the planes where the first vertical plate 211 and the second vertical plate 212 are located, that is, the first angle between the first vertical plate 211 and the first bottom plate 22 and the second angle between the second vertical plate 212 and the second bottom plate 23 are both 90 degrees.

[0075] Among them, the first bending portion 213 and the second bending portion 214 can be block structures of equal length (that is, the size in the first direction X of the liquid cooling plate 20 is much smaller than the length of the first bottom plate 22) or strip structures (that is, the size 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 they can be block structures or strip structures of unequal lengths. The first direction X is the length direction of the liquid cooling plate 20 and the arrangement direction of the battery cells in the battery module 30.

[0076] Alternatively, if Figure 4 As shown, the first bending portion 213 connecting the first vertical plate 211 and the first bottom plate 22, and the second bending portion 214 connecting the second vertical plate 212 and the second bottom plate 23 are both block structures, and are located at the end of the liquid cooling plate 20 in the first direction X. In this way, by designing the first bending portion 213 and the second bending portion 214 of the block structure, it is convenient to reduce the resistance during bending, thereby improving the bending efficiency.

[0077] Optionally, a plurality of first bending portions 213 are provided between the first vertical plate 211 and the first bottom plate 22, and a plurality of second bending portions 214 are provided between the second vertical plate 212 and the second bottom plate 23; the plurality of first bending portions 213 and the plurality of second bending portions 214 are spaced apart along the first direction X of the liquid cooling plate 20. In this way, by providing the plurality of first bending portions 213 and the plurality of second bending portions 214, the stability of the connection between the first bottom plate 22 and the first vertical plate 211, and between the second bottom plate 23 and the second vertical plate 212 is improved while simplifying the bending.

[0078] The liquid cooling plate 20 further includes a water inlet joint 24 and a water outlet joint 25, one of which is arranged on the first bottom plate 22, and the other is arranged on the second bottom plate 23. The water inlet joint 24 and the water outlet joint 25 can be located at the same end of the first bottom plate 22 and the second bottom plate 23 in the first direction X of the liquid cooling plate 20, so as to facilitate the connection of the water inlet joint 24 and the water outlet joint 25 with the external connection pipeline. For example, Figure 3 As shown, a water inlet joint 24 is provided on the first bottom plate 22, and a water outlet joint 25 is provided on the second bottom plate 23, and the water inlet joint 24 and the water outlet joint 25 are located at the same end of the first bottom plate 22 and the second bottom plate 23 in the first direction X of the liquid cooling plate 20.

[0079] Figure 3 The figure shows the situation where the water inlet joint 24 and the water outlet joint 25 are located on the upper surfaces of the first bottom plate 22 and the second bottom plate 23. Of course, the water inlet joint 24 and the water outlet joint 25 can also be located on the sides of the edges of the first bottom plate 22 and the second bottom plate 23 respectively, as long as they can be connected to external pipelines. The implementation method of the present application does not limit this.

[0080] In addition, since the flow channel connecting the water inlet connector 24 and the water outlet connector 25 is an integral flow channel on the first bottom plate 22, the second bottom plate 23, the first vertical plate 211, and the second vertical plate 212, when the fluid flows to the bottom plate (taking the second bottom plate 23 as an example) where the water outlet connector 25 is located, the temperature of the fluid is relatively high. At this time, in order to ensure the cooling effect of the fluid on the battery module 30 on the second bottom plate 23, the length of the flow channel on the second bottom plate 23 can be set to be greater than the length of the flow channel on the first bottom plate 22, and / or the length of the flow channel on the second vertical plate 212 can be set to be greater than the length of the flow channel on the first vertical plate 211. For example, the flow channel on the first bottom plate 22 is a one-way flow channel (such as a straight flow channel), and the flow channel on the second bottom plate 23 is a two-way flow channel (such as a U-shaped flow channel).

[0081] In this way, by extending the length of the flow channel on the second bottom plate 23 and / or extending the length of the flow channel on the second vertical plate 212, the cooling time of the second bottom plate 23 and / or the second vertical plate 212 on the battery module 30 is increased, thereby ensuring that the cooling effects of the first battery module 31 and the second battery module 32 on the first bottom plate 22 and the second bottom plate 23 are similar.

[0082] In the embodiment of the present application, the connecting portion 215 for connecting the first vertical plate 211 and the second vertical plate 212 can be a strip structure, that is, the size 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, so as to ensure the stability of the connection between the first vertical plate 211 and the second vertical plate 212; or the connecting portion 215 includes at least one connecting segment, each connecting segment is a block structure, that is, the size in the first direction X of the liquid cooling plate 20 is much smaller than the length of the first bottom plate 22, so as to reduce the bending resistance of the connecting segment and improve the bending efficiency; at the same time, it is convenient to adjust the height misalignment of the two ends of the connecting segment, adjust the relative positions of the first vertical plate 211 and the second vertical plate 212 in the second direction Z of the liquid cooling plate 20 (that is, the height direction of the liquid cooling plate 20, the height direction of the battery cell in the battery module 30), and then adjust the height of the first bottom plate 22 and the second bottom plate 23 to ensure that multiple battery modules 30 are at the same height.

[0083] Among them, for the bent connecting portion 215, it can be bent at multiple positions (for example, at least 4 bending positions) when bending to ensure the relative distribution of the first vertical plate 211 and the second vertical plate 212. The bending angle of each bending position is greater than or equal to 90 degrees, and the radius of the arc chamfer at the bending position is greater than or equal to 8 mm, so as to avoid the situation where the stress at the bending position after bending is large. For example, the connecting portion 215 is bent at 6 positions, and the bending angle at each bending position is 120 degrees, and the bending radius is 10 mm, so as to ensure the connection with the first vertical plate 211 and the second vertical plate 212 while avoiding the situation where the stress at the bending position is large.

[0084] In some embodiments, Figure 3 As shown, the connecting portion 215 includes a first connecting section 216 , and the first connecting section 216 is located at a first end 20 a of the liquid cooling plate 20 in the first direction X.

[0085] In combination with the above-mentioned first bottom plate 22 and second bottom plate 23 having a water inlet joint 24 and a water outlet joint 25, it can be as follows Figure 3 As shown, the water inlet joint 24, the water outlet joint 25 and the first connecting section 216 are located at different ends of the liquid cooling plate 20 in the first direction X, that is, the water inlet joint 24 and the water outlet joint 25 are located at the second end 20b of the liquid cooling plate 20 in the first direction X. Figure 5 As shown, the water inlet joint 24, the water outlet joint 25 and the first connecting section 216 are located at the same end of the liquid cooling plate 20 in the first direction X, that is, the water inlet joint 24, the water outlet joint 25 and the first connecting section 216 are all located at the first end 20a of the liquid cooling plate 20 in the first direction X.

[0086] The water inlet connector 24 , the water outlet connector 25 , and the first connecting section 216 located at the same end can save available space of the liquid cooling plate 20 in the first direction X, thereby ensuring effective use of the space in the battery box 10 and reducing waste caused by the liquid cooling plate 20 .

[0087] Furthermore, in the third direction Y of the liquid cooling plate 20 , the water inlet joint 24 , the water outlet joint 25 , and the first connecting section 216 have overlapping areas, thereby further saving available space of the liquid cooling plate 20 in the first direction X.

[0088] In which, when the first bending portion 213 and the second bending portion 214 are both block structures and the number is one, it can be as follows: Figure 3 and Figure 4 As shown, the first bending portion 213, the second bending portion 214 and the first connecting section 216 are located at different ends of the liquid cooling plate 20 in the first direction X, that is, the first bending portion 213, the second bending portion 214 are located at the second end 20b of the liquid cooling plate 20 in the first direction X. Alternatively, the first bending portion 213, the second bending portion 214 and the first connecting section 216 are located at the same end of the liquid cooling plate 20 in the first direction X, that is, the first bending portion 213, the second bending portion 214 and the first connecting section 216 are all located at the first end 20a of the liquid cooling plate 20 in the first direction X. When the first bending portion 213, the second bending portion 214 and the first connecting section 216 are located at different ends of the liquid cooling plate 20 in the first direction X, the stability of the connection between the first vertical plate 211, the second vertical plate 212, the first bottom plate 22 and the second bottom plate 23 can be improved.

[0089] In some embodiments, Figure 4 As shown, before the liquid cooling plate 20 is bent, that is, when the liquid cooling plate 20 is flattened, the first vertical plate 211, the second vertical plate 212, and the first connecting section 216 form a T-shaped gap.

[0090] Specifically, Figure 5 and Figure 6 As shown, the first vertical plate 211 has a first notch 2111, and the second vertical plate 212 has a second notch 2121; the first notch 2111 is located at the first end 20a of the first vertical plate 211 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 2121 is located at the same end as the first notch 2111, and is located at a corner away from the second bottom plate 23; the first notch 2111 has an intersecting first edge 2112 and a second edge 2113, and the second notch 2121 has an intersecting third edge 2122 and a fourth edge 2123, and both ends of the first connecting section 216 are connected to the first edge 2112 and the third edge 2122 respectively, and the lengths of the second edge 2113 and the fourth edge 2123 are both less than 1 / 2 of the size of the liquid cooling portion 21 in the second direction Z of the liquid cooling plate 20.

[0091] Optionally, the first notch 2111 and the second notch 2121 can both be rectangular notches, and the first direction X of the first edge 2112 and the first direction X of the third edge 2122 are both parallel to the first direction X of the liquid cooling plate 20, the length of the first edge 2112 is equal to the length of the third edge 2122, and the first direction X of the second edge 2113 and the first direction X of the fourth edge 2123 are both parallel to the second direction Z of the liquid cooling plate 20; in this case, the first connecting section 216 is also rectangular after being flattened, and the width of the first connecting section 216 after being flattened is close to the length of the first edge 2112 (the error is in the slit width of the gap), and the length of the first connecting section 216 after being flattened is close to the sum of the lengths of the second edge 2113 and the fourth edge 2123 (the error is in the slit width of the gap).

[0092] Optionally, the length of the first edge 2112 and the length of the third edge 2122 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 216 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 216 and avoid the first connecting section 216 occupying a large space in the first direction X of the liquid cooling plate 20.

[0093] Optionally, the lengths of the second edge 2113 and the fourth edge 2123 are both less than 1 / 2 of the size of the liquid cooling part 21 in the second direction Z, that is, the length of the first connecting section 216 after flattening is less than the size of the liquid cooling plate 20 in the second direction Z, thereby ensuring the reliability of the connection between the first connecting section 216 and the first vertical plate 211 and the second vertical plate 212, while reducing the space occupied by the first connecting section 216 after bending, thereby improving the space utilization in the battery box 10.

[0094] In other embodiments, Figure 7 or Figure 8 As shown, before the liquid cooling plate 20 is bent, a straight seam is formed between the first vertical plate 211 and the second vertical plate 212 , and the first connecting section 216 , the first vertical plate 211 , and the second vertical plate 212 form a gap connected to the straight seam.

[0095] Specifically, Figure 7 and Fig. 9 ,or Figure 8 and Fig.10 As shown, the first connecting section 216 is a U-shaped structure when flattened, and both ends of the first connecting section 216 are respectively connected to the edges of the first end 20a of the first vertical plate 211 and the second vertical plate 212 in the first direction X of the liquid cooling plate 20.

[0096] The first connecting section 216 can be a right-angled U-shape or an arc U-shape after being flattened. Taking the arc U-shape as an example, the first connecting section 216 can be a semicircular ring structure or a semi-elliptical ring structure after being flattened, and for the first connecting section 216 with a semicircular ring structure, the space occupied by the first connecting section 216 after being bent can be further reduced, thereby further improving the space utilization rate in the battery box 10.

[0097] Optionally, in the first direction X of the liquid cooling plate 20, the first connecting section 216 protrudes from the first bottom plate 22 and the second bottom plate 23, thereby saving materials for the first vertical plate 211, the second vertical plate 212, the first bottom plate 22, and the second bottom plate 23, so as to reduce the space occupied by the liquid cooling plate 20 at the first end 20a, thereby facilitating improving the space utilization inside the battery box 10.

[0098] In other embodiments, Fig.11 and Fig.12 As shown, the connecting portion 215 further includes a second connecting section 217 , and the second connecting section 217 is located at the second end 20 b of the liquid cooling plate 20 in the first direction X.

[0099] Thus, by disposing the second connecting section 217 , multi-point connection between the first vertical plate 211 and the second vertical plate 212 is achieved, thereby ensuring the connection strength between the first vertical plate 211 and the second vertical plate 212 and ensuring the stability of the overall structure of the liquid cooling plate 20 .

[0100] The structure of the second connecting section 217 may refer to the above-mentioned embodiment, except that the second connecting section 217 is only used to realize the connection between the first vertical plate 211 and the second vertical plate 212 .

[0101] In some embodiments, Figure 5 and Figure 6 As shown, the liquid cooling plate 20 further includes an elastic member 26 , and the elastic member 26 is located between the first vertical plate 211 and the second vertical plate 212 .

[0102] In this way, through the setting of the elastic member 26, elastic extrusion between the first vertical plate 211 and the second vertical plate 212 is achieved, which is convenient for absorbing the installation tolerance along the third direction Y of the liquid cooling plate 20 when the battery module 30 is assembled; elastic buffering between the first vertical plate 211 and the second vertical plate 212 is also achieved, avoiding the situation where the connecting part 215 is broken when the first vertical plate 211 and / or the second vertical plate 212 is impacted by external force.

[0103] Among them, the elastic member 26 can be a hard structural member (such as a spring, a spring, etc.) or a soft structural member (such as an elastic foam, a heat-conducting foam, etc.). Taking the soft structural member as an example, when the elastic member 26 is an elastic foam, it can ensure that the first vertical plate 211, the second vertical plate 212 and the elastic foam have a sufficiently large contact area, thereby increasing the reliability of the elastic buffer between the first vertical plate 211 and the second vertical plate 212, and avoiding the condensation on the opposite surfaces of the first vertical plate 211 and the second vertical plate 212; and when the elastic member 26 is a heat-conducting foam, it can not only increase the reliability of the elastic buffer between the first vertical plate 211 and the second vertical plate 212, but also realize the heat conduction between the first vertical plate 211 and the second vertical plate 212, and avoid the condensation on the opposite surfaces of the first vertical plate 211 and the second vertical plate 212.

[0104] 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.

[0105] 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.

[0106] 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.

[0107] 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: A vertically arranged liquid cooling portion (21), and a first bottom plate (22) and a second bottom plate (23) respectively located on two sides of the liquid cooling portion (21); The liquid cooling part (21) comprises a first vertical plate (211) and a second vertical plate (212) which are arranged opposite to each other, the first vertical plate (211), the second vertical plate (212), the first bottom plate (22) and the second bottom plate (23) are an integrally bent structure, and before the liquid cooling plate (20) is bent, a straight seam is formed between the first vertical plate (211) and the second vertical plate (212), a connecting portion (215) is provided between the first vertical plate (211) and the second vertical plate (212), a first bending portion (213) is provided between the first vertical plate (211) and the first bottom plate (22), and a second bending portion (214) is provided between the second vertical plate (212) and the second bottom plate (23); The flow channel of the connecting portion (215) is respectively connected to the flow channel of the first vertical plate (211) and the flow channel of the second vertical plate (212); the flow channel of the first bent portion (213) is respectively connected to the flow channel of the first bottom plate (22) and the flow channel of the first vertical plate (211); and the flow channel of the second bent portion (214) is respectively connected to the flow channel of the second bottom plate (23) and the flow channel of the second vertical plate (212); The connecting portion (215) comprises a first connecting section (216), the first connecting section (216) being located at a first end (20a) of the liquid cooling plate (20) in a first direction, one of the first bottom plate (22) and the second bottom plate (23) being provided with a water inlet joint (24), and the other being provided with a water outlet joint (25), the water inlet joint (24), the water outlet joint (25) and the first connecting section (216) being located at the same end of the liquid cooling plate (20) in the first direction, the first direction being the arrangement direction of the battery cells in the battery module (30); The liquid cooling plate (20) further comprises: any one of A and B, wherein A is: the first vertical plate (211) has a first notch (2111), and the second vertical plate (212) has a second notch (2121); the first notch (2111) is located at a first end (20a) of the first vertical plate (211) in a first direction of the liquid cooling plate (20), and is located at a corner away from the first bottom plate (22); the second notch (2121) is located at the same end as the first notch (2111), and is located away from the second bottom plate (23 ); the first notch (2111) has a first edge (2112) and a second edge (2113) that intersect each other, the second notch (2121) has a third edge (2122) and a fourth edge (2123) that intersect each other, the two ends of the first connecting section (216) are respectively connected to the first edge (2112) and the third edge (2122), and the lengths of the second edge (2113) and the fourth edge (2123) are both less than 1 / 2 of the dimension of the liquid cooling portion (21) in the second direction of the liquid cooling plate (20); The B is: the two ends of the first connecting section (216) are respectively connected to the edges of the first vertical plate (211) and the second vertical plate (212) at the first end (20a) in the first direction of the liquid cooling plate (20), and the first connecting section (216) is a U-shaped structure when flattened.

2. The liquid cooling plate according to claim 1, characterized in that: The liquid cooling plate (20) further comprises an elastic member (26), wherein the elastic member (26) is located between the first vertical plate (211) and the second vertical plate (212).

3. The liquid cooling plate according to claim 2, characterized in that: The elastic member (26) is elastic foam.

4. The liquid cooling plate according to claim 1, characterized in that: The first bending portion (213) and the second bending portion (214) are both block structures, and are located at different ends of the liquid cooling plate (20) in the first direction from the first connecting section (216).

5. The liquid cooling plate according to claim 1, wherein: The first connecting section (216) is a semicircular ring structure when flattened.

6. The liquid cooling plate according to claim 1 or 4, characterized in that: The connecting portion (215) further comprises a second connecting section (217), wherein the second connecting section (217) is located at a second end (20b) of the liquid cooling plate (20) in the first direction.

7. The liquid cooling plate according to any one of claims 1 to 3, characterized in that: A plurality of first bending portions (213) are provided between the first vertical plate (211) and the first bottom plate (22), and a plurality of second bending portions (214) are provided between the second vertical plate (212) and the second bottom plate (23); The plurality of first bending portions (213) and the plurality of second bending portions (214) are distributed at intervals along the first 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 liquid cooling part (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); the first battery module (31) and the second battery module (32) are located on both sides of the liquid cooling portion (21); the first battery module (31) and the second battery module (32) are respectively attached to the first vertical plate (211) and the second vertical plate (212), 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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