Battery cell liquid cooling system and battery

Abstract

The utility model relates to the technical field of energy storage cooling, in particular to a battery cell liquid cooling system which comprises a liquid cooling bottom plate and liquid cooling side plates, the multi-directional heat absorption cooling of the bottom and the side part of the battery cell increases the heat exchange area of the battery cell, so that the temperature difference of different parts of the battery cell is reduced, particularly the temperature uniformity of the top and the bottom of the battery cell is better, meanwhile, the management of local hot spots of the battery cell is facilitated, the risks of thermal runaway and battery damage are reduced, and the working efficiency and the service life of the battery are improved. Meanwhile, the self-hindering flow channel is designed based on the working principle of a Tesla valve, the effect of hindering fluid flowing can be achieved by generating a disordered flowing mode, a specific amount of fluid is forced to flow upwards at an inlet of a flow section, namely a side cold plate refrigerant inlet, the gravity effect is overcome, and refrigerant flowing in the side plate flow channel is achieved without a driving part; the section size of the inlet of the pipe section does not need to be reduced, and operation and maintenance difficulty and cost increase caused by blockage are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage cooling, and in particular to a battery core liquid cooling system and a battery. Background Art

[0002] With the continuous growth of global energy demand and the rapid development of renewable energy, energy storage systems play an increasingly important role in power systems. As an energy storage device in energy storage systems, the working efficiency and safety of batteries have always been the focus of attention. In order to improve the working efficiency and safety of batteries, liquid-cooled battery systems have emerged. The circulating coolant absorbs the heat generated by the battery during operation, thereby maintaining the operating temperature of the battery, improving the working efficiency of the battery, and extending the battery life.

[0003] However, the liquid cooling system in traditional batteries mainly adopts the bottom plate type liquid cooling plate, that is, the liquid cooling plate is placed at the bottom of the battery cell body. Although some heat dissipation effects are achieved, the bottom plate type liquid cooling plate only provides cooling at the bottom, which makes the temperature control of different parts of the battery cell inconsistent, especially the temperature difference between the top and the bottom is too large. This uneven cooling will lead to uneven battery performance and may even cause the risk of thermal runaway, affecting the service life of the battery. Therefore, based on the above problems, the existing technology needs to be further improved. Utility Model Content

[0004] The purpose of the utility model is to provide a battery liquid cooling system and a battery to solve the prior art problems existing in the above-mentioned background technology.

[0005] In order to solve the above technical problems, the technical solution provided by the utility model is:

[0006] On the one hand, the present application provides a battery cell liquid cooling system, including a liquid-cooled bottom plate and a liquid-cooled side plate, the liquid-cooled bottom plate is provided with a bottom plate flow channel, the liquid-cooled side plate is provided with a side plate flow channel, the side plate flow channel is through-connected with the bottom plate flow channel, the bottom plate flow channel includes a refrigerant inlet, a self-obstructing flow channel and a refrigerant outlet, and the refrigerant inlet and the refrigerant outlet are both connected to the self-obstructing flow channel.

[0007] Based on the above technical solution, the self-obstructing flow channel includes at least one curved pipe section and a straight pipe section, both ends of the curved pipe section are connected to the straight pipe section to form a circulation flow channel, and the refrigerant inlet and the refrigerant outlet are respectively connected to the two ends of the straight pipe section.

[0008] Based on the above technical solution, the side plate flow channel includes a first main channel, a branch channel and a second main channel. The first main channel and the second main channel are symmetrically arranged, and the head end of the first main channel is connected to the refrigerant inlet, the end of the second main channel is connected to the refrigerant outlet, and the branch channel is arranged between the first main channel and the second main channel.

[0009] Based on the above technical solution, a plurality of branch channels are provided, one end of which is connected to the end of the first main channel, and the other end is connected to the beginning of the second main channel.

[0010] Based on the above technical solution, the branch channel is configured to be arc-shaped.

[0011] Based on the above technical solution, the spacing between the multiple branch channels decreases from bottom to top.

[0012] Based on the above technical solution, the liquid-cooled bottom plate and the liquid-cooled side plates are configured as an integrally formed structure.

[0013] Based on the above technical solution, the liquid-cooled bottom plate and the liquid-cooled side plates are made of metal or alloy materials.

[0014] On the other hand, the present application also provides a battery, comprising the above-mentioned battery cell liquid cooling system.

[0015] Based on the above technical solution, it also includes a battery cell, the liquid-cooled bottom plate is arranged at the bottom end of the battery cell, the liquid-cooled side plate is arranged on the outer side wall of the battery cell, and surface heat-conducting structural glue is arranged between the battery cell and the liquid-cooled bottom plate and the liquid-cooled side plate.

[0016] The beneficial effects of the technical solution provided by the utility model are:

[0017] 1. In the utility model, a liquid-cooled bottom plate is provided, and a liquid-cooled side plate is added to the liquid-cooled bottom plate, and a refrigerant medium flow channel is provided in the liquid-cooled bottom plate and the liquid-cooled side plate, so as to absorb heat from the bottom and side of the battery cell in multiple directions and cool the battery cell, thereby increasing the heat exchange area of ​​the battery cell, thereby reducing the temperature difference between different parts of the battery cell, especially improving the temperature uniformity between the top and bottom of the battery cell, solving the problem of poor temperature uniformity in the direction of high height of the battery cell in the traditional bottom plate liquid cooling method, and at the same time helping to manage local hot spots of the battery cell, reducing the risk of thermal runaway and battery damage, and improving the working efficiency and service life of the battery.

[0018] 2. The self-obstructing flow channel set in this application is set based on the working principle of the Tesla valve, which is not limited to a curved pipe section to achieve a reasonable distribution ring of the refrigerant medium; the self-obstructing flow channel section, as a fluid control section without moving parts, can play a role in obstructing the flow of fluid by generating a chaotic flow pattern, forcing a specific amount of fluid to turn to the side cold plate refrigerant inlet at the entrance of this flow section and overcome the gravity to flow upward, so as to achieve the flow of refrigerant in the side plate flow channel. At the same time, by adopting the design of the self-obstructing flow channel section, compared with the traditional design with only straight pipe sections, there is no need to reduce the cross-sectional size of the pipe section entrance to the extreme, so as to avoid blockage and increase the difficulty and cost of operation and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the battery in the utility model;

[0020] Figure 2 It is a schematic diagram of the structure of the bottom plate flow channel and the side plate flow channel of the utility model;

[0021] Figure 3 It is a structural schematic diagram of the self-blocking flow channel in the utility model;

[0022] Figure 4 It is a structural schematic diagram of the side plate flow channel of the utility model; DETAILED DESCRIPTION

[0023] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0024] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] In the description of the present invention, it should be understood that the terms "left", "right", "front", "back", "top", "bottom", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0026] like Figures 1 to 4 As shown, this embodiment provides a battery cell liquid cooling system, including a liquid cooling bottom plate 1 and a liquid cooling side plate 2, the liquid cooling bottom plate 1 is provided with a bottom plate flow channel 3, the liquid cooling side plate 2 is provided with a side plate flow channel 4, the side plate flow channel 4 is through-connected with the bottom plate flow channel 3, the bottom plate flow channel 3 includes a refrigerant inlet 31, a self-obstructing flow channel 32 and a refrigerant outlet 33, and the refrigerant inlet 31 and the refrigerant outlet 33 are both connected to the self-obstructing flow channel 32.

[0027] The utility model provides a battery cell liquid cooling system, which is provided with a liquid cooling bottom plate 1 and a liquid cooling side plate 2 added to the liquid cooling bottom plate 1, and a refrigerant medium flow channel is provided in the liquid cooling bottom plate 1 and the liquid cooling side plate 2, so as to perform multi-directional heat absorption cooling on the bottom and side of the battery cell, increase the heat exchange area of ​​the battery cell, thereby reducing the temperature difference between different parts of the battery cell, especially the temperature uniformity between the top and the bottom of the battery cell is better, and solves the problem of poor temperature uniformity in the direction of high height of the battery cell in the traditional bottom plate liquid cooling method, and at the same time helps to manage local hot spots of the battery cell, reduce the risk of thermal runaway and battery damage, and improve the working efficiency and service life of the battery.

[0028] Specifically, the refrigerant enters from the refrigerant inlet 31 and flows out from the refrigerant outlet 33 to realize the circulation of the refrigerant. By providing a self-blocking channel 32 in the bottom plate channel 3, the refrigerant can not only flow in the bottom plate channel 3, but also realize the refrigerant medium diversion, so that part of the refrigerant flows along the side plate channel 4 without external driving force and flows through the side and top of the battery cell, realizing the simultaneous heat dissipation of multiple parts of the battery cell, and the cooling effect is good. The self-blocking channel uses the Tesla valve principle to generate greater resistance to the flow of fluid in a specific direction. Under the premise of no moving parts, it not only increases the refrigerant flow of the side cold plate, but also takes into account the refrigerant flow of the bottom liquid cold plate, so as to reduce the temperature difference between the top and bottom of the battery cell and improve the temperature uniformity of the battery cell; and there is no need to compress the cross-sectional size of the bottom channel to the extreme, so as to reduce the potential risk of blockage of the liquid cooling pipeline.

[0029] Based on the above technical solution, the self-obstructing flow channel 32 includes at least one curved pipe section 321 and a straight pipe section 322. Both ends of the curved pipe section 321 are connected to the straight pipe section 322 to form a circulation flow channel. The refrigerant inlet 31 and the refrigerant outlet 33 are respectively connected to the two ends of the straight pipe section 322.

[0030] In a preferred embodiment, the self-blocking flow channel 32 in this embodiment is set based on the working principle of the Tesla valve, which is not limited to a curved pipe section 321, so as to realize a reasonable distribution ring of the refrigerant medium; as a fluid control section without moving parts, the self-blocking flow channel section can play a role in blocking the flow of fluid by generating a chaotic flow pattern, forcing a specific amount of fluid to turn to the refrigerant inlet of the side cold plate at the entrance of this flow section and overcome the gravity to flow upward, so as to realize the flow of refrigerant in the side plate flow channel. At the same time, by adopting the design of the self-blocking flow channel section, compared with the traditional design with only a straight pipe section, there is no need to reduce the cross-sectional size of the pipe section entrance to the extreme, so as to avoid blockage and increase the difficulty and cost of operation and maintenance.

[0031] It is understandable that the self-obstructing flow channel section cannot strictly obstruct the flow of refrigerant, and a certain amount of refrigerant still passes through the self-obstructing flow channel section to ensure effective heat dissipation at the bottom of the battery cell.

[0032] Based on the above technical solution, the side panel channel 4 includes a first main channel 41, a branch channel 42 and a second main channel 43. The first main channel 41 and the second main channel 43 are symmetrically arranged and the head end of the first main channel 41 is connected to the refrigerant inlet 31, the end of the second main channel 43 is connected to the refrigerant outlet 33, and the branch channel 42 is arranged between the first main channel 41 and the second main channel 43.

[0033] Based on the above technical solution, a plurality of branch channels 42 are provided, one end of which is connected to the end of the first main channel 41 , and the other end is connected to the beginning of the second main channel 43 .

[0034] By providing a main channel and multiple branch channels in the liquid-cooled side plate 2, the refrigerant flow rate and flow area can be increased, the heat exchange area can be increased, the heat exchange efficiency of the battery cell can be improved, the temperature uniformity of the battery cell body can be improved, and the service life of the battery can be improved.

[0035] Based on the above technical solution, the branch channel 42 is configured to be arc-shaped.

[0036] Based on the above technical solution, the spacing between the multiple branch channels 42 decreases from bottom to top.

[0037] In a preferred embodiment, the multiple branch channels 42 in the side plate channel 4 are all arranged as an arc structure to minimize the channel resistance; at the same time, the spacing between the branch channels 42 is not fixed, and the spacing of the branch channels decreases from bottom to top, that is, the spacing becomes smaller near the top, thereby ensuring the passage of the top refrigerant to adapt to the characteristic that heat is easily accumulated at the top of the battery cell, realize heat exchange cooling at the top of the battery cell, reduce the temperature difference between the top and the bottom of the battery cell, and improve the temperature uniformity of the battery cell.

[0038] Based on the above technical solution, the liquid-cooled bottom plate 1 and the liquid-cooled side plate 2 are configured as an integrally formed structure.

[0039] Through the integrated design between the liquid-cooled bottom plate 1 and the liquid-cooled side plate 2, it is more convenient to adapt the connection setting between the bottom plate flow channel 3 and the side plate flow channel 4, that is, the bottom plate flow channel 3 and the side plate flow channel 4 form a continuous loop, so that the refrigerant medium can circulate unimpeded in the loop, and the heat generated by the battery cell can be taken away in time. Compared with the traditional bottom plate liquid cooling, it can absorb heat from multiple directions to achieve efficient cooling. At the same time, the integrated design also reduces the number of components and connection points, making the structure more compact and simple, maintenance and repair are also more convenient, reducing manufacturing costs, while reducing potential failure points and improving system reliability. Preferably, the liquid-cooled bottom plate and the liquid-cooled side plate are fixedly connected by welding, which is firm and reliable.

[0040] Based on the above technical solution, the liquid-cooled bottom plate 1 and the liquid-cooled side plate 2 are made of metal or alloy materials. Preferably, the bottom plate and the side plate are both made of metal or alloy materials with good thermal conductivity, and the surface is insulated, and the coolant medium flow channel inside is set to achieve efficient heat exchange cooling of the battery cell and extend the service life of the battery.

[0041] This embodiment also provides a battery, including the above-mentioned battery cell liquid cooling system.

[0042] On the basis of the above technical solution, it also includes a battery cell 5, the liquid-cooled bottom plate 1 is arranged at the bottom end of the battery cell 5, the liquid-cooled side plate 2 is arranged on the outer side wall of the battery cell 5, and surface thermal conductive structural glue 6 is arranged between the battery cell 5 and the liquid-cooled bottom plate 1 and the liquid-cooled side plate 2.

[0043] In a preferred embodiment, the surface thermal conductive structural adhesive 6 can be divided into bottom thermal conductive structural adhesive and side thermal conductive structural adhesive, and both are high thermal conductivity structural adhesive materials, which can fill the gap between the battery cell and the liquid cooling plate, reduce the contact internal resistance between the battery cell and the liquid cooling bottom plate and the liquid cooling side plate, ensure high heat conduction efficiency, and achieve efficient heat exchange cooling; at the same time, it can also play a role in fixing the battery unit, i.e., the battery cell body, to prevent loosening due to vibration and other adverse conditions.

[0044] It should be noted that the head end and the tail end mentioned above are defined according to the flow direction of the cold medium, which is only for the convenience of describing and understanding the technical solution of the present application, and does not constitute a limitation to the present application.

[0045] The basic principle and main features of the utility model are shown and described above. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments. Therefore, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is limited by the appended claims rather than the above description. Therefore, it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the utility model.

[0046] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A battery cell liquid cooling system, characterized in that: The invention comprises a liquid-cooled bottom plate (1) and a liquid-cooled side plate (2), wherein a bottom plate flow channel (3) is arranged in the liquid-cooled bottom plate (1), and a side plate flow channel (4) is arranged in the liquid-cooled side plate (2), wherein the side plate flow channel (4) is connected to the bottom plate flow channel (3), and the bottom plate flow channel (3) comprises a refrigerant inlet (31), a self-obstructing flow channel (32) and a refrigerant outlet (33), wherein both the refrigerant inlet (31) and the refrigerant outlet (33) are connected to the self-obstructing flow channel (32).

2. A battery core liquid cooling system according to claim 1, characterized in that: The self-impeding flow channel (32) comprises at least one curved pipe section (321) and a straight pipe section (322), both ends of the curved pipe section (321) are connected to the straight pipe section (322) to form a circulating flow channel, and the refrigerant inlet (31) and the refrigerant outlet (33) are respectively connected to the two ends of the straight pipe section (322).

3. A battery core liquid cooling system according to claim 1, characterized in that: The side plate flow channel (4) comprises a first main flow channel (41), a branch flow channel (42) and a second main flow channel (43); the first main flow channel (41) and the second main flow channel (43) are symmetrically arranged, and the head end of the first main flow channel (41) is connected to the refrigerant inlet (31), and the end of the second main flow channel (43) is connected to the refrigerant outlet (33); the branch flow channel (42) is arranged between the first main flow channel (41) and the second main flow channel (43).

4. A battery core liquid cooling system according to claim 3, characterized in that: The branch channels (42) are provided in plurality and one end of the branch channels (42) is connected to the end of the first main channel (41) and the other end is connected to the beginning of the second main channel (43).

5. A battery core liquid cooling system according to claim 3, characterized in that: The branch channel (42) is arranged in an arc shape.

6. A battery core liquid cooling system according to claim 1, characterized in that: The spacing between the plurality of branch channels (42) decreases from bottom to top.

7. The battery core liquid cooling system according to claim 1, characterized in that: The liquid cooling bottom plate (1) and the liquid cooling side plate (2) are arranged as an integrally formed structure.

8. The battery core liquid cooling system according to claim 1, characterized in that: The liquid cooling bottom plate (1) and the liquid cooling side plate (2) are made of metal or alloy material.

9. A battery, characterized in that: A battery cell liquid cooling system comprising any one of claims 1 to 8.

10. A battery according to claim 9, characterized in that: It also includes a battery core (5), wherein the liquid-cooled bottom plate (1) is arranged at the bottom end of the battery core (5), the liquid-cooled side plate (2) is arranged on the outer side wall of the battery core (5), and surface heat-conducting structural glue (6) is arranged between the battery core (5) and the liquid-cooled bottom plate (1) and the liquid-cooled side plate (2).

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