Novel cooling plate suitable for sodium ion battery monomer and power supply module

Abstract

The invention provides a novel cooling plate suitable for a sodium ion battery monomer and a power supply module. The cooling plate includes: a cooling plate body; a plurality of annular first cooling channels which are arranged at intervals are arranged in the cooling plate main body, the areas of surrounding areas of the plurality of first cooling channels are different, and in any two adjacent first cooling channels, the first cooling channel with the large surrounding area is arranged around the first cooling channel with the small surrounding area; the cooling plate body further comprises a second cooling channel and a third cooling channel, the second cooling channel and the third cooling channel communicate with the multiple first cooling channels arranged at intervals, and the second cooling channel is used for conveying cooling liquid into the multiple first cooling channels. And the third cooling channels are used for outputting the cooling liquid in the multiple first cooling channels.

Description

Technical Field

[0001] The invention belongs to the field of sodium ion energy storage batteries, and in particular relates to a novel cooling plate suitable for sodium ion battery cells and power supply modules. Background Art

[0002] In the field of energy storage, compared with lithium-ion batteries, sodium-ion batteries have outstanding characteristics such as great price advantages, high environmental friendliness, and good safety performance. They are currently the focus of development of new power system industries at home and abroad.

[0003] Currently, relevant technologies mainly use air cooling, liquid cooling, phase change material cooling and other technologies to cool sodium ion batteries. In liquid cooling technology, a classic serpentine flow cooling plate is usually used, and coolant is input into the serpentine flow cooling plate to cool the battery.

[0004] However, the serpentine flow cooling plate has certain limitations on the flow direction of the cooling medium, which is not conducive to improving the heat exchange performance between the cooling plate and the sodium-ion battery. Summary of the invention

[0005] The present invention provides a novel cooling plate suitable for a sodium ion battery cell and a power supply module, which can improve the heat exchange performance of the cooling plate.

[0006] In one aspect, a cooling plate is provided, comprising: Cooling plate body; The cooling plate body is provided with a plurality of annular first cooling channels arranged at intervals, the areas of the surrounding regions of the plurality of first cooling channels are different, and among any two adjacent first cooling channels, the first cooling channel with a larger surrounding region is arranged around the first cooling channel with a smaller surrounding region; The cooling plate body also includes a second cooling channel and a third cooling channel, the second cooling channel and the third cooling channel are connected to multiple first cooling channels arranged at intervals, the second cooling channel is used to transport coolant to the multiple first cooling channels, and the third cooling channel is used to output the coolant in the multiple first cooling channels.

[0007] Optionally, the first cooling channel is in the shape of a polygonal ring or a circular ring.

[0008] Optionally, there are multiple second cooling channels and multiple third cooling channels, the second cooling channels and the third cooling channels are perpendicular to the edges of the multiple first cooling channels, and the multiple second cooling channels and the multiple third cooling channels are arranged at equal intervals.

[0009] In another aspect, a sodium ion battery is provided, comprising: shell; A battery cell is disposed in the housing; A cooling plate is arranged between the battery cell and the shell, and the cooling plate is a cooling plate as described in any one of the above items.

[0010] Optionally, the sodium ion battery further comprises a plurality of phase change material layers, and the plurality of phase change material layers and the plurality of battery cells are alternately stacked.

[0011] Optionally, the phase change material layer is formed of paraffin or graphite.

[0012] Optionally, the sodium ion battery further comprises a shockproof material layer, and the shockproof material layer is arranged close to the inner surface of the outer shell.

[0013] Optionally, the shockproof material layer is formed of shockproof cotton.

[0014] Optionally, the shell is formed of epoxy resin.

[0015] In another aspect, a power supply module is provided, comprising: A plurality of sodium ion batteries connected in series, wherein an inter-group cooling plate is provided between any two adjacent sodium ion batteries, and the inter-group cooling plate is a cooling plate as described in any one of the above items; The coolant delivery unit is used to deliver coolant to the cooling plates and inter-pack cooling plates in the sodium-ion battery. The technical solution provided by the embodiments of the present disclosure has the following beneficial effects: In an embodiment of the present disclosure, a cooling plate is provided, wherein the cooling plate has a plurality of first cooling channels of different sizes, and in two adjacent first cooling channels, the first cooling channel with a large surrounding area is arranged around the first cooling channel with a small surrounding area, that is, the first cooling channels are arranged sequentially from the center of the cooling plate to the edge of the cooling plate. The first cooling channels are distributed relatively evenly in the cooling plate, which is conducive to making the coolant distributed relatively evenly in the cooling plate, thereby facilitating the cooling effect of the cooling plate. In addition, a second cooling channel and a third cooling channel are provided in the cooling plate, and the second cooling channel and the third cooling channel are both connected to the first cooling channel. Coolant can be input into the plurality of first cooling channels through the second cooling channel, and the coolant spreads from the connection point between the second cooling channel and the first cooling channel to all positions in the first cooling channel, and the speed at which the coolant spreads to all cooling channels in the cooling plate is faster, thereby facilitating improving the cooling efficiency of the cooling plate. The coolant after heat exchange is output through the third cooling channel, and the coolant is continuously input through the second cooling channel, so that the cooling efficiency of the cooling plate can be continuously ensured to be high. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A schematic diagram of the structure of a cooling plate provided in an embodiment of the present disclosure; Figure 2 A schematic diagram of the structure of a sodium ion battery provided in an embodiment of the present disclosure; Figure 3 A schematic diagram of the structure of a power supply module provided in an embodiment of the present disclosure; Figure 4 A schematic diagram of the structure of another power supply module provided in an embodiment of the present disclosure. The reference numerals are as follows: 1: cooling plate; 11: cooling plate body; 12: first cooling channel; 13: second cooling channel; 14: third cooling channel; 2: sodium ion battery; 21: shell; 22: battery cell; 23: phase change material layer; 24: shockproof material layer; 25: controller; 26: fixing plate; 3: power supply module; 31: inter-group cooling plate; 32: coolant delivery unit; 33: power conversion system. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Figure 1 A schematic diagram of the structure of a cooling plate provided by an embodiment of the present disclosure. Figure 1 , the cooling plate 1 comprises: Cooling plate body 11; The cooling plate body 11 is provided with a plurality of annular first cooling channels 12 arranged at intervals, and the areas of the surrounding regions of the plurality of first cooling channels 12 are different. Among any two adjacent first cooling channels 12, the first cooling channel 12 with a larger surrounding area is arranged around the first cooling channel 12 with a smaller surrounding area. The cooling plate body 11 also includes a second cooling channel 13 and a third cooling channel 14. The second cooling channel 13 and the third cooling channel 14 are connected to multiple first cooling channels 12 arranged at intervals. The second cooling channel 13 is used to transport coolant to the multiple first cooling channels 12, and the third cooling channel 14 is used to output the coolant in the multiple first cooling channels 12.

[0020] In an embodiment of the present disclosure, a cooling plate is provided, wherein the cooling plate has a plurality of first cooling channels of different sizes, and in two adjacent first cooling channels, the first cooling channel with a large surrounding area is arranged around the first cooling channel with a small surrounding area, that is, the first cooling channels are arranged sequentially from the center of the cooling plate to the edge of the cooling plate. The first cooling channels are distributed relatively evenly in the cooling plate, which is conducive to making the coolant distributed relatively evenly in the cooling plate, thereby facilitating the cooling effect of the cooling plate. In addition, a second cooling channel and a third cooling channel are provided in the cooling plate, and the second cooling channel and the third cooling channel are both connected to the first cooling channel. Coolant can be input into the plurality of first cooling channels through the second cooling channel, and the coolant spreads from the connection point between the second cooling channel and the first cooling channel to all positions in the first cooling channel, and the speed at which the coolant spreads to all cooling channels in the cooling plate is faster, thereby facilitating improving the cooling efficiency of the cooling plate. The coolant after heat exchange is output through the third cooling channel, and the coolant is continuously input through the second cooling channel, so that the cooling efficiency of the cooling plate can be continuously ensured to be high.

[0021] In the embodiment of the present disclosure, the first cooling channel 12 is in the shape of a polygonal ring or a circular ring.

[0022] In the embodiment of the present disclosure, the polygonal ring and the circular ring can ensure that the first cooling channel is distributed more evenly in the cooling plate, thereby ensuring the cooling effect of the cooling plate.

[0023] In other examples, the shape of the first cooling channel may be an irregular ring, which is not limited in the present disclosure.

[0024] In the embodiment of the present disclosure, there are multiple second cooling channels 13 and multiple third cooling channels 14, the second cooling channels 13 and the third cooling channels 14 are perpendicular to the edges of the multiple first cooling channels 12, and the multiple second cooling channels 13 and the multiple third cooling channels 14 are arranged at equal intervals.

[0025] In the embodiment of the present disclosure, the number of the second cooling channels and the third cooling channels is set to ensure the flow speed of the coolant in the cooling plate. The coolant with a higher temperature after heat exchange in the cooling plate can quickly flow out of the cooling plate through the multiple third cooling channels, and the multiple second cooling channels can quickly input the coolant with a lower temperature into the cooling plate, so that the temperature of the coolant in the cooling plate can be maintained at a low level to ensure the cooling efficiency of the cooling plate. In addition, the second cooling channel and the third cooling channel are arranged perpendicular to the first cooling channel, which can ensure that the length of the second cooling channel and the third cooling channel is shorter, which is conducive to quickly injecting the coolant into the first cooling channel and quickly discharging the coolant in the first cooling channel. In addition, the second cooling channel is perpendicular to the first cooling channel. When the coolant moves to the connection point of the second cooling channel and the first cooling channel, it is more conducive to the coolant flowing into the first cooling channels on both sides of the connection point.

[0026] In the disclosed embodiment, the cooling plate is made of aluminum.

[0027] In the disclosed embodiment, the coolant inlet is located at the center of the top of the cooling plate, and the outlet is located at the center of the bottom of the cooling plate.

[0028] Figure 2 This is a schematic diagram of the structure of a sodium ion battery provided by an embodiment of the present disclosure. Figure 2 , the sodium ion battery 2 comprises: Housing 21; A battery cell 22 is disposed in the housing 21; The cooling plate 1 is arranged between the battery cell 22 and the housing 21. The cooling plate 1 is as follows Figure 1 The cooling plate 1.

[0029] In the embodiment of the present disclosure, Figure 1 The cooling plate is arranged in the shell of the sodium ion battery to cool the battery cell, thereby ensuring the cooling rate of the sodium ion battery.

[0030] In the disclosed embodiment, the housing 21 is formed of epoxy resin.

[0031] In the disclosed embodiments, epoxy resin has the characteristics of high strength and high temperature resistance, and the shell formed by epoxy resin can play the role of insulation, fixation and heat insulation in the sodium ion battery.

[0032] In the disclosed embodiment, the sodium ion battery 2 further includes a plurality of phase change material layers 23 , and the plurality of phase change material layers 23 and the plurality of battery cells 22 are alternately stacked.

[0033] In the embodiment of the present disclosure, a phase change material layer is further provided, and the phase change material layer can reduce the temperature of the sodium ion battery, which is beneficial to keep the temperature of the sodium ion battery at a low level to ensure the safety of the sodium ion battery.

[0034] In the embodiment of the present disclosure, the phase change material layer 23 is formed of paraffin or graphite.

[0035] In the disclosed embodiment, paraffin wax and graphite can regulate the temperature of the battery cell without consuming additional energy.

[0036] In the disclosed embodiment, the sodium ion battery further includes a shockproof material layer 24 , and the shockproof material layer 24 is disposed close to the inner surface of the outer shell.

[0037] In the embodiment of the present disclosure, a shockproof material layer is provided, which can, on the one hand, eliminate the effects of expansion and contraction of the battery during operation and reduce the risk of deformation such as bulging of the battery cells; on the other hand, it can be used to fix the position of the battery cells and the phase change material layer to ensure the safety and stability of the battery.

[0038] In the embodiment of the present disclosure, the shockproof material layer 24 is formed by shockproof cotton. Among them, the shockproof performance of the shockproof cotton is good. Of course, the shockproof material layer can also be other materials, and the present disclosure does not limit this.

[0039] In the disclosed embodiment, the sodium ion battery 2 further includes a controller 25 and a fixing plate 26, wherein the controller 25 is safely located on the right side of the housing 21, and receives instructions from the upper unit such as the power supply module through the built-in control logic on the one hand to control the battery operation state, and on the other hand to monitor the battery state through the sensor. The fixing plate 26 is used to fix the tabs (not shown in the figure) of the battery cell to prevent the tabs from moving or loosening during the operation of the battery.

[0040] In the embodiment of the present disclosure, the controller 25 can detect the operating status of the sodium ion battery in real time through a temperature sensor, a liquid level sensor and a flow sensor, wherein the temperature sensor is used to monitor the temperature of the sodium ion battery, the liquid level sensor is used to monitor the liquid level of the coolant inside the sodium ion battery, and the flow sensor is used to monitor the flow of the coolant.

[0041] In the embodiment of the present disclosure, the cooling liquid can be water or ethylene glycol solution. Of course, the cooling liquid can also be other liquids that can have a cooling effect, and the present disclosure is not limited to this.

[0042] Figure 3 This is a schematic diagram of the structure of a power supply module provided by an embodiment of the present disclosure. Figure 3 , the power supply module 3 includes: A plurality of sodium ion batteries 2 are connected in series in sequence, and an inter-group cooling plate 31 is provided between any two adjacent sodium ion batteries 2. The inter-group cooling plate 31 is Figure 1 The cooling plate; The coolant delivery unit 32 is used to deliver coolant to the cooling plate 1 and the inter-group cooling plate 31 in the sodium ion battery 2 .

[0043] Among them, sodium ion batteries are Figure 2 The sodium-ion battery shown.

[0044] In the disclosed embodiment, a number of sodium-ion batteries are connected in series to form an energy supply module. In order to minimize the floor space, the sodium-ion batteries are closely connected. An inter-group cooling plate is added between every two adjacent sodium-ion batteries, and a "battery-cooling plate-battery" structure is adopted. Cooling plates are set both inside and outside the sodium-ion battery. The heat generated during the operation of the sodium-ion battery is taken away by the flow of coolant, ensuring the safe and stable operation of the power supply module. At the same time, the cooling plates between and within the sodium-ion battery groups are designed in a bus-based manner, and the coolant delivery unit realizes the integrated management of the coolant delivery, which reduces the design and installation costs of the power supply module in large-scale energy storage power stations.

[0045] exist Figure 3 In the embodiment, the number of sodium ion batteries is 4. In actual implementation, the number of sodium ion batteries connected in series can be any number, and the present disclosure does not impose any limitation on this.

[0046] In the embodiment of the present disclosure, the coolant delivery unit is a circulation pump.

[0047] In the disclosed embodiment, the power supply module also includes a power conversion system (PCS), which converts the direct current of the battery into alternating current, then increases the voltage level through a step-up transformer, and is connected to the new power system after convergence.

[0048] Figure 4 This is a schematic diagram of the structure of another power supply module provided in an embodiment of the present disclosure. Figure 4 , Figure 4 The power supply module includes more sodium-ion batteries 2.

[0049] exist Figure 4 In the example, 16 sodium ion batteries are connected in series and in parallel to form a power supply module. In other examples, any number of sodium ion batteries can be connected in series and in parallel to form a power supply module.

[0050] Finally, it is worth noting that in the embodiments of the present disclosure, the operation modes of the sodium ion battery and the power supply module are as follows: In the first step, the controller of the sodium-ion battery collects the operating status information of the sodium-ion battery in real time through temperature sensors, liquid level sensors, flow sensors, etc., and uploads it to the power supply module.

[0051] In the second step, the power supply module tracks the operating status of the new power system, and sends dispatch instructions to the controller of the sodium-ion battery based on the status information of each sodium-ion battery to realize the charging and discharging control of the sodium-ion battery.

[0052] In the third step, the sodium-ion battery will produce different responses when receiving different scheduling instructions. When the temperature of the sodium-ion battery is too high, the sodium-ion battery, on the one hand, exchanges heat between the phase change material layer and the battery cell to achieve short-term heat storage. On the other hand, a low-temperature coolant can be introduced into the cooling plate through a circulating pump, and the temperature of the sodium-ion battery can be lowered through heat exchange between the coolant and the battery cell to achieve temperature control. At the same time, when the sodium-ion battery needs to be cold-started, a high-temperature liquid can be introduced into the cooling plate through a circulating pump to assist the cold-start process of the sodium-ion battery.

[0053] In the fourth step, the controller of the sodium-ion battery uses sensors to monitor the operating status of the battery module in real time, and uploads the battery module status information to the power supply module, realizing closed-loop control of large-scale sodium-ion energy storage power stations and ensuring the safe and stable operation of the energy storage power stations.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cooling plate, characterized in that: include: Cooling plate body; The cooling plate body is provided with a plurality of annular first cooling channels arranged at intervals, the areas of the surrounding regions of the plurality of first cooling channels are different, and among any two adjacent first cooling channels, the first cooling channel with a larger surrounding region is arranged around the first cooling channel with a smaller surrounding region; The cooling plate body also includes a second cooling channel and a third cooling channel, the second cooling channel and the third cooling channel are connected to multiple first cooling channels arranged at intervals, the second cooling channel is used to transport coolant to the multiple first cooling channels, and the third cooling channel is used to output the coolant in the multiple first cooling channels.

2. The cooling plate according to claim 1, characterized in that The first cooling channel is in the shape of a polygonal ring or a circular ring.

3. The cooling plate according to claim 1, characterized in that There are multiple second cooling channels and multiple third cooling channels, the second cooling channels and the third cooling channels are perpendicular to the edges of the multiple first cooling channels, and the multiple second cooling channels and the multiple third cooling channels are arranged at equal intervals.

4. A sodium ion battery, characterized in that: include: shell; A battery cell is disposed in the housing; A cooling plate is arranged between the battery cell and the shell, and the cooling plate is the cooling plate according to any one of claims 1 to 3.

5. The sodium ion battery according to claim 4, characterized in that: The sodium ion battery also includes a plurality of phase change material layers, and the plurality of phase change material layers and the plurality of battery cells are alternately stacked. 6 . The sodium ion battery according to claim 5 , wherein the phase change material layer is formed of paraffin or graphite.

7. The sodium ion battery according to claim 4, characterized in that: The sodium ion battery also includes a shockproof material layer, which is arranged close to the inner surface of the shell.

8. The sodium ion battery according to claim 7, characterized in that: The shockproof material layer is formed by shockproof cotton.

9. The sodium ion battery according to claim 4, characterized in that: The shell is formed by epoxy resin.

10. A power supply module, characterized in that: include: A plurality of sodium ion batteries connected in series, wherein an inter-group cooling plate is provided between any two adjacent sodium ion batteries, wherein the inter-group cooling plate is a cooling plate according to any one of claims 1 to 3; The coolant delivery unit is used to deliver coolant to the cooling plates and inter-pack cooling plates in the sodium-ion battery.

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