Layered immersed liquid-cooled battery pack

Abstract

The invention relates to the technical field of energy storage, and discloses a layered immersed liquid-cooled battery pack which comprises a battery module and a box body, the battery module is located in the box body, and a first gap is formed between the battery module and one end of the box body to form a front-end flow channel; a second gap is formed between the battery module and the other end of the box body to form a rear end runner; a third gap is formed between the battery module and the side surface of the box body, the battery module comprises a plurality of battery columns, a fourth gap is formed between the plurality of battery columns, and the third gap and the fourth gap jointly form a plurality of side surface flow channels; a fifth gap is formed between the battery module and the upper top plate of the box body to form a top runner, and a sixth gap is formed between the battery module and the lower bottom plate of the box body to form a bottom runner. Liquid inlets are formed in the two side faces of one end of the box body, and liquid outlets are formed in an upper top plate and a lower bottom plate of one end of the box body. The layered immersed liquid-cooled battery pack solves the problem that the temperature difference between the upper bottom and the lower bottom of a battery cell and between battery cell monomers is relatively large in liquid cooling.

Description

Technical Field

[0001] The present invention relates to the field of energy storage technology, and more specifically, to a layered immersed liquid-cooled battery pack. Background Art

[0002] In the energy storage industry, the battery cell is the core component of the energy storage battery, which plays the role of storing and releasing electrical energy. Its related technologies have emerged and developed rapidly. Among the related technologies of the battery cell, heat dissipation has always been a key branch field, and the main heat dissipation method is liquid cooling.

[0003] The corresponding device is mainly composed of a liquid cooling unit, a battery module, a liquid cooling plate and a liquid cooling system pipeline. The liquid cooling plate is symmetrically connected to the upper and lower sides of the battery module. During the charging and discharging process of the battery cell, the coolant flows through the internal flow channel on the liquid cooling plate to take away the heat generated by the battery cell. At the same time, the coolant temperature rises and flows back to the liquid inlet of the liquid cooling unit through the liquid cooling pipeline system. Then, the heat generated by the battery cell is dissipated to the external environment through the internal heat exchange system of the liquid cooling unit, and the coolant is cooled at the same time.

[0004] However, in the existing heat dissipation method for battery cells, since the battery cells and liquid cooling plates use indirect contact cooling, the internal flow channel surface area of ​​the liquid cooling plate is small, and the flow channel distribution is uneven, resulting in a small heat dissipation area for the battery cells, and a large temperature difference between the upper and lower bottoms of the battery cells and between the battery cells, which can also cause damage to the battery cells. If thermal conductive glue is used to connect the battery cells and the liquid cooling plate, there will be a large contact thermal resistance, and the thickness of the thermal conductive glue is inconsistent, resulting in a large temperature difference between each part of the liquid cooling plate, resulting in a large difference in thermal resistance between the battery cells. Summary of the invention

[0005] The present invention provides a layered immersion liquid-cooled battery pack, which solves the problem of large temperature difference between the upper and lower bottoms of a battery cell and between battery cell monomers during liquid cooling.

[0006] In the first aspect of the present invention, a layered immersion liquid-cooled battery pack is provided, comprising: a battery module, a box body, the battery module is located inside the box body, and further comprising: a first gap between the battery module and one end of the box body to form a front end flow channel; a second gap between the battery module and the other end of the box body to form a rear end flow channel; a third gap between the battery module and the side of the box body, the battery module comprises a plurality of battery columns, a fourth gap is provided between the plurality of battery columns, the third gap and the fourth gap together constitute a plurality of side flow channels; a fifth gap is provided between the battery module and the upper top plate of the box body to form a top flow channel, a sixth gap is provided between the battery module and the lower bottom plate of the box body to form a bottom flow channel; liquid inlets are provided on both side surfaces of one end of the box body, and liquid outlets are provided on the upper top plate and the lower bottom plate at one end of the box body.

[0007] Furthermore, there are two liquid inlets, which are symmetrically arranged on two side surfaces at one end of the box body.

[0008] Furthermore, there are two liquid outlets, the upper top plate and the lower bottom plate of the box body both have a central axis, the extension direction of the central axis is parallel to the extension direction of the side flow channel, and the two liquid outlets are arranged on the central axis of the upper top plate and the lower bottom plate at one end of the box body.

[0009] Furthermore, the distance of the first gap is 26 mm.

[0010] Furthermore, the distance of the second gap is 26 mm.

[0011] Furthermore, the distance between the third gap and the fourth gap is 8 mm.

[0012] Furthermore, the distance between the fifth gap and the sixth gap is 8 mm.

[0013] Furthermore, the lower base plate of the box body is detachably connected.

[0014] Furthermore, the lower base plate is detachably connected by a plurality of bolts.

[0015] Furthermore, the method includes: S1: the coolant flows into the front-end flow channel from two liquid inlets, is split in the front-end flow channel, and flows into multiple side flow channels, thereby cooling the sides of the battery module; S2: the coolant converges into the rear-end flow channel from multiple side flow channels, and then flows into the top flow channel and the bottom flow channel from the rear-end flow channel respectively, thereby cooling the top and bottom of the battery module; S3: the coolant flows from the top flow channel and the bottom flow channel into the liquid outlet to flow out.

[0016] In a second aspect of the present invention, a layered immersion liquid-cooled battery pack method is provided, the method comprising:

[0017] S1: The coolant flows into the front flow channel from the two liquid inlets, is split in the front flow channel, and flows into a plurality of side flow channels, thereby cooling the sides of the battery module;

[0018] S2: The coolant flows into the rear end flow channel from the multiple side flow channels, and then flows into the top flow channel and the bottom flow channel from the rear end flow channel respectively, so as to cool the top and bottom of the battery module;

[0019] S3: The cooling liquid flows from the top flow channel and the bottom flow channel into the liquid outlet to flow out.

[0020] Compared with the prior art, the present invention includes at least the following beneficial effects: the layered immersion liquid-cooled battery pack provided by the present invention solves the problem of large temperature difference between the upper and lower bottom of the battery cell and between the battery cell monomers in liquid cooling. Through four flow channels, namely the front flow channel, the rear flow channel, the side flow channel and the top and bottom flow channels, the contact area between the coolant and the battery module is large, that is, the heat dissipation area of ​​the battery is large, and each flow channel is independent of each other, so that the internal flow state is better and the heat dissipation is more uniform. Specifically: the coolant flows into the front flow channel from the two liquid inlets, is split in the front flow channel, flows through multiple side flow channels, and then merges into the rear flow channel, and then flows from the rear flow channel into the top flow channel and the bottom flow channel respectively, so as to cool the sides, top and bottom of the battery module, and the coolant flows into the liquid outlet from the top flow channel and the bottom flow channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood by reading the detailed description below with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, in which:

[0022] One or more embodiments are exemplarily described by the figures in the corresponding drawings, and these exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0023] Figure 1 A cooling liquid flow diagram of a layered immersion liquid-cooled battery pack provided by an embodiment of the present invention;

[0024] Figure 2 A cooling liquid flow diagram of a layered immersion liquid-cooled battery pack provided by an embodiment of the present invention;

[0025] Figure 3 A two-dimensional top view of a box 2 of a layered immersion liquid-cooled battery pack provided in an embodiment of the present invention;

[0026] Figure 4 A three-dimensional diagram of a box 2 of a layered immersion liquid-cooled battery pack provided by an embodiment of the present invention;

[0027] Figure 5 A top view of a lower base plate 6 of a layered immersion liquid-cooled battery pack provided in an embodiment of the present invention;

[0028] Figure 6 A three-dimensional diagram of the lower base plate of a layered immersion liquid-cooled battery pack provided by an embodiment of the present invention;

[0029] Figure 7 A front view of a battery module 1 of a layered immersion liquid-cooled battery pack provided by an embodiment of the present invention;

[0030] Figure 8 A three-dimensional diagram of a battery module 1 of a layered immersion liquid-cooled battery pack provided in an embodiment of the present invention.

[0031] Description of reference numerals:

[0032] 1-battery module, 2-box, 3-liquid inlet, 4-liquid outlet, 5-upper top plate, 6-lower bottom plate, 7-bolt, 8-sheet metal, 9-protrusion, 10-cable tie, 11-first gap, 12-second gap, 13-third gap, 14-fourth gap, 15-fifth gap, 16-sixth gap. DETAILED DESCRIPTION

[0033] The principles and spirit of the present invention will be described below with reference to several exemplary embodiments. It should be understood that these embodiments are provided only to enable those skilled in the art to better understand and implement the present invention, and are not intended to limit the scope of the present invention in any way. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0034] Those skilled in the art know that the embodiments of the present invention can be implemented as a system, device, apparatus, method or computer program product. Therefore, the present invention can be specifically implemented in the following forms, namely: complete hardware, complete software (including firmware, resident software, microcode, etc.), or a combination of hardware and software.

[0035] It should be noted that any number of elements in the drawings is for illustration rather than limitation, and any naming is only for distinction and does not have any limiting meaning.

[0036] In order to facilitate the understanding of the present invention, the present invention is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "connecting" another element, it can be directly on another element, or there can be one or more centered elements therebetween. The orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "upper end", "lower end", "top" and "bottom" used in this specification is based on the orientation or positional relationship shown in the accompanying drawings, 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0037] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0038] In the energy storage industry, the battery cell is the core component of the energy storage battery, which plays the role of storing and releasing electrical energy. Its related technologies have emerged and developed rapidly. Among the related technologies of the battery cell, heat dissipation has always been a key branch field, and the main heat dissipation method is liquid cooling.

[0039] The corresponding device is mainly composed of a liquid cooling unit, a battery module, a liquid cooling plate and a liquid cooling system pipeline. The liquid cooling plate is symmetrically connected to the upper and lower sides of the battery module. During the charging and discharging process of the battery cell, the coolant flows through the internal flow channel on the liquid cooling plate to take away the heat generated by the battery cell. At the same time, the coolant temperature rises and flows back to the liquid inlet of the liquid cooling unit through the liquid cooling pipeline system. Then, the heat generated by the battery cell is dissipated to the external environment through the internal heat exchange system of the liquid cooling unit, and the coolant is cooled at the same time.

[0040] Liquid cooling technology is mainly divided into three types: cold plate, spray and immersion. Cold plate liquid cooling transfers heat indirectly through the cold plate, while immersion liquid cooling directly immerses the electronic equipment in the coolant, and spray liquid cooling sprays the coolant on the heat-generating components to dissipate heat.

[0041] However, in the existing heat dissipation method for battery cells, since the battery cells and liquid cooling plates use indirect contact cooling, the internal flow channel surface area of ​​the liquid cooling plate is small, and the flow channel distribution is uneven, resulting in a small heat dissipation area for the battery cells, and a large temperature difference between the upper and lower bottoms of the battery cells and between the battery cells, which can also cause damage to the battery cells. If thermal conductive glue is used to connect the battery cells and the liquid cooling plate, there will be a large contact thermal resistance, and the thickness of the thermal conductive glue is inconsistent, resulting in a large temperature difference between each part of the liquid cooling plate, resulting in a large difference in thermal resistance between the battery cells.

[0042] In order to solve the above technical problems, an embodiment of the present invention provides a layered immersed liquid-cooled battery pack. The specific implementation of the present invention will be described in detail below with reference to the accompanying drawings, wherein: Figure 1 A cooling liquid flow diagram of a layered immersion liquid-cooled battery pack provided by an embodiment of the present invention; Figure 2 A cooling liquid flow diagram of a layered immersion liquid-cooled battery pack provided by an embodiment of the present invention; Figure 3 A two-dimensional top view of a box 2 of a layered immersion liquid-cooled battery pack provided in an embodiment of the present invention; Figure 4 A three-dimensional diagram of a box 2 of a layered immersion liquid-cooled battery pack provided by an embodiment of the present invention;

[0043] Figure 5A top view of a lower base plate 6 of a layered immersion liquid-cooled battery pack provided in an embodiment of the present invention; Figure 6 A three-dimensional diagram of the lower base plate of a layered immersion liquid-cooled battery pack provided by an embodiment of the present invention; Figure 7 A front view of a battery module 1 of a layered immersion liquid-cooled battery pack provided by an embodiment of the present invention; Figure 8 A three-dimensional diagram of a battery module 1 of a layered immersion liquid-cooled battery pack provided in an embodiment of the present invention.

[0044] like Figure 1 , Figure 2 As shown, a layered immersion liquid-cooled battery pack provided by an embodiment of the present invention includes: a battery module 1, a box 2, the battery module 1 is located inside the box 2, and also includes: a first gap 11 is provided between the battery module 1 and one end of the box 2 to form a front end flow channel; a second gap 12 is provided between the battery module 1 and the other end of the box 2 to form a rear end flow channel; a third gap 13 is provided between the battery module 1 and the side of the box 2, the battery module 1 includes a plurality of battery columns, a fourth gap 14 is provided between the plurality of battery columns, and the third gap 13 and the fourth gap 14 together constitute a plurality of side flow channels; a fifth gap 15 is provided between the battery module 1 and the upper top plate 5 of the box 2 to form a top flow channel, and a sixth gap 16 is provided between the battery module 1 and the lower bottom plate 6 of the box 2 to form a bottom flow channel; a liquid inlet 3 is provided on both side surfaces of one end of the box 2, and a liquid outlet 4 is provided on the upper top plate 5 and the lower bottom plate 6 at one end of the box 2.

[0045] The present invention provides a layered immersion liquid-cooled battery pack, which solves the problem of large temperature difference between the upper and lower bottom of the battery cell and between the battery cell monomers in liquid cooling. Through four flow channels, namely the front flow channel, the rear flow channel, the side flow channel and the top and bottom flow channels, the contact area between the coolant and the battery module is large, that is, the heat dissipation area of ​​the battery is large, and each flow channel is independent of each other, so that the internal flow state is better and the heat dissipation is more uniform. Specifically: the coolant flows into the front flow channel from the two liquid inlets 3, is split in the front flow channel, flows through multiple side flow channels, and then merges into the rear flow channel, and then flows from the rear flow channel into the top flow channel and the bottom flow channel respectively, so as to cool the sides, top and bottom of the battery module, and the coolant flows into the liquid outlet 4 from the top flow channel and the bottom flow channel.

[0046] like Figure 1 , 2 As shown in the figure, the direction of the dotted arrow represents the flow direction of the coolant, and the section line is a schematic diagram of the cut-away box body, which has a cavity inside, so the section line shown in the figure represents the box body. Figure 1 There are five parallel lines in the horizontal direction, representing five side flow channels. As indicated by the size of the dotted arrows, the two side flow channels closest to the outside should have the largest flow rate, and then decrease from the outside to the inside. Figure 2The horizontal arrow from right to left in the middle represents the side flow channel, and the upper and lower flow channels represent the top flow channel and the bottom flow channel respectively. The upper and lower flow channels flow from left to right and finally flow out from the upper and lower liquid outlets respectively.

[0047] like Figure 3 , 4 As shown, 7 represents bolts, which are used to close the box body by cooperating with threaded holes, 5 represents the upper bottom plate of the box body, 3 represents the liquid inlets on both sides, 4 represents the upper and lower liquid outlets, and 2 represents the box body.

[0048] like Figure 5 , 6 As shown, 6 represents the lower base plate of the ground box, 9 represents the protrusion thereon, and the protrusion 9 is to cooperate with the gap between the battery modules 1. A plurality of bolts 7 tightly connect the lower base plate 6 and the box body 2 to prevent leakage of the internal coolant.

[0049] like Figure 7 , 8 As shown, a main view and a three-dimensional view of the battery module 1 are respectively given, so that the cooperation with the layered immersion liquid-cooled battery pack can be more vividly presented.

[0050] In the above embodiment, the battery module 1 includes a plurality of battery columns, each of which has a fourth gap 14, and the upper top plate 5 and the lower bottom plate 6 of the corresponding box body 2 are also provided with a protrusion 9 corresponding to the fourth gap 14. As shown in the figure, the protrusion 9 cooperates with the fourth gap to form a fixation, thereby realizing the relative fixation between the battery module 1 and the box body 2. The plurality of battery columns are fixed by a cable tie 10, and the cable tie 10 surrounds the side of the battery module 1 circumferentially.

[0051] In the above embodiments, the battery module 1 and one end of the box 2 form a front end flow channel, the battery module 1 is specifically connected to the box 2 via a sheet metal part 8, and each battery column of the battery module 1 is connected together via a mica sheet.

[0052] In the above embodiments, the number of the liquid inlets 3 can be one or more. If one liquid inlet is provided, the coolant will flow in from a single direction and gradually spread throughout the battery module 1. If multiple liquid inlets (for example, two) are provided, the coolant can flow in from both ends at the same time. Since the battery module 1 is generally arranged symmetrically, if the two liquid inlets 3 are also symmetrically provided accordingly, the effect should be the best. Similarly, as described above, the liquid outlet 4 can be provided with one or more, and one should be provided on the upper top plate, and the coolant will flow out from the upper end after entering the box body 2 and gradually irrigating the entire box body 2. However, the best is to symmetrically provide two on the upper top plate 5 and the lower bottom plate 6, and the two are located on one side with the two liquid inlets 3, so that the fluid stress is most uniform and the efficiency is the highest.

[0053] In the above embodiments, multiple battery columns are separated by mica sheets. Mica sheets are a non-metallic mineral material composed of polysilicon muscovite, quartz, garnet and rutile. It has good insulation properties and low-loss thermal resistance function, and is often used as a black body material. The color of mica sheets is generally colorless and transparent, with a glass luster, and the hardness is relatively low, and it is easy to peel into thin sheets. Mica sheets are widely used, including as raw and auxiliary materials in the fields of televisions, power capacitors, thermal relays, monitoring displays, aerospace, aviation, communications, radars, etc. Therefore, the multiple battery columns separated by the battery module 1 are separated by mica sheets.

[0054] Furthermore, there are two liquid inlets 3 , which are symmetrically arranged on two side surfaces of one end of the box body 2 .

[0055] In the above embodiment, the two liquid inlets 3 are symmetrically arranged, and the coolant can enter from the two liquid inlets 3 at the same time, and converge from both sides to the middle, where the two coolant flows interfere with each other and then mix into the side flow channel.

[0056] Furthermore, there are two liquid outlets 4, the upper top plate 5 and the lower bottom plate 6 of the box body 2 both have a central axis, the extension direction of the central axis is parallel to the extension direction of the side flow channel, and the two liquid outlets 4 are arranged on the central axis of the upper top plate 5 and the lower bottom plate 6 at one end of the box body 2.

[0057] Furthermore, the distance of the first gap 11 is 26 mm.

[0058] In the above embodiments, a study conducted a three-dimensional steady-state analysis of the liquid cooling plate by using a computational fluid dynamics (CFD) numerical calculation method, and explored the effects of different coolant flow rates, channel widths, channel depths, and enhanced heat transfer structures on the heat dissipation performance, temperature uniformity, and energy consumption performance of the liquid cooling plate13. The study found that increasing the flow rate can improve the heat dissipation performance of the liquid cooling plate to a certain extent, but excessively increasing the flow rate will increase the energy consumption of the system. At the same time, the non-uniform design of the channel width, the reduction of the channel depth, and the arrangement of the enhanced heat transfer structure help to improve the heat dissipation and temperature uniformity performance of the liquid cooling system. In the present invention, according to multiple studies and verifications by the inventors, the first gap 11 is preferably 26 mm, so that the cooling efficiency can be maximized.

[0059] Furthermore, the distance of the second gap 12 is 26 mm.

[0060] Furthermore, the distance between the third gap 13 and the fourth gap 14 is 8 mm.

[0061] Furthermore, the distance between the fifth gap 15 and the sixth gap 16 is 8 mm.

[0062] In the above embodiments, a plurality of numerical values ​​are obtained by the inventor after repeated experiments and are very practical.

[0063] Furthermore, the lower base plate 6 of the box body 2 is detachably connected.

[0064] Furthermore, the lower base plate 6 is detachably connected by a plurality of bolts 7 .

[0065] Furthermore, S1: the coolant flows into the front channel from the two liquid inlets 3, is split in the front channel, and flows into multiple side channels, thereby cooling the sides of the battery module 1; S2: the coolant converges into the rear channel from multiple side channels, and then flows into the top channel and the bottom channel from the rear channel respectively, thereby cooling the top and bottom of the battery module 1; S3: the coolant flows from the top channel and the bottom channel into the liquid outlet 4 to flow out.

[0066] In the above embodiments, the reflux design performed by the method can reduce the temperature difference of the battery. The simulation calculation verifies that the maximum temperature difference of the battery is small, only 3.04°C, and the internal flow state is good.

[0067] Usage method and working principle: The working principle is as follows: The layered immersion liquid-cooled battery pack provided by the present invention solves the problem of large temperature difference between the upper and lower bottom of the battery cell and between the battery cell monomers in liquid cooling. Through four flow channels, namely the front flow channel, the rear flow channel, the side flow channel and the top and bottom flow channels, the contact area between the coolant and the battery module is large, that is, the heat dissipation area of ​​the battery is large, and each flow channel is independent of each other, so that the internal flow state is better and the heat dissipation is more uniform. The specific method of use is as follows: the coolant flows into the front flow channel from the two liquid inlets 3, is split in the front flow channel, flows through multiple side flow channels, and then merges into the rear flow channel, and then flows from the rear flow channel into the top flow channel and the bottom flow channel respectively, so as to cool the sides, top and bottom of the battery module, and the coolant flows into the liquid outlet 4 from the top flow channel and the bottom flow channel.

[0068] In some embodiments, a layered immersion liquid-cooled battery pack method is provided, comprising:

[0069] S1: The coolant flows into the front flow channel from the two liquid inlets 3, is split in the front flow channel, and flows into a plurality of side flow channels, thereby cooling the side of the battery module 1;

[0070] S2: The coolant flows into the rear end flow channel from the multiple side flow channels, and then flows into the top flow channel and the bottom flow channel from the rear end flow channel respectively, so as to cool the top and bottom of the battery module 1;

[0071] S3: The cooling liquid flows from the top flow channel and the bottom flow channel into the liquid outlet 4 to flow out.

[0072] Specifically, after the coolant flows in through these two liquid inlets, it will be diverted in the front flow channel and then flow into multiple side flow channels. The side flow channel is composed of the third gap between the battery module and the side of the box body and the fourth gap between the multiple battery columns inside the battery module. The design of these side flow channels helps to increase the contact area between the coolant and the battery module, thereby more effectively exchanging heat. In this way, the sides of the battery module are fully cooled, which helps maintain the operating temperature of the battery and prolong its service life.

[0073] Preferably, when the coolant flows through the side flow channel, the flow rate and flow rate of the coolant can be controlled by adjusting the size of the liquid inlet or the design of the flow channel to achieve the best cooling effect. For example, the flow rate of the coolant can be increased by increasing the diameter of the liquid inlet or optimizing the shape of the flow channel, thereby improving the cooling efficiency. In addition, some obstacles or guide plates can be set in the flow channel to guide the flow of the coolant to ensure that each part of the battery module can be evenly cooled.

[0074] It should be noted that the cooling liquid flows from multiple side channels into the rear channel. The rear channel refers to the channel formed by the second gap between the battery module and the other end of the box body. It is responsible for collecting the cooling liquid from the side channels and guiding it to the top and bottom channels of the battery module. The purpose of this step is to achieve cooling of the top and bottom of the battery module to ensure uniform temperature of the entire battery module.

[0075] Specifically, after the coolant flows into the rear channel, it will flow from the rear channel into the top channel and the bottom channel respectively. The top channel and the bottom channel are respectively formed by the gap between the battery module and the upper top plate of the box and the gap between the battery module and the lower bottom plate of the box. The design of these two channels enables the coolant to directly cool the top and bottom of the battery module, further reducing the operating temperature of the battery module.

[0076] Preferably, during the confluence of the rear end flow channel, the flow characteristics of the coolant can be optimized by adjusting the cross-sectional shape or length of the rear end flow channel to ensure that the coolant can be evenly distributed to the top flow channel and the bottom flow channel. In addition, the proportion of the coolant flowing to the top flow channel and the bottom flow channel can be controlled by setting a diverter plate or a regulating valve in the rear end flow channel to meet the cooling requirements of the battery module under different working conditions.

[0077] It should be noted that the coolant flows from the top flow channel and the bottom flow channel into the liquid outlet. The liquid outlet refers to the outlet provided on the top plate and the bottom plate of the box body, which is used for the coolant to flow out of the battery pack. The purpose of this step is to discharge the coolant after heat exchange from the battery pack to complete a cooling cycle.

[0078] Specifically, after flowing through the top flow channel and the bottom flow channel, the coolant will flow into the liquid outlet to flow out of the battery pack. This process ensures that the coolant can be discharged smoothly and avoids the coolant from being retained inside the battery pack, thereby ensuring the efficient operation of the cooling system.

[0079] Preferably, the design of the liquid outlet can be optimized according to the flow rate and pressure of the coolant to ensure that the coolant can flow out smoothly. For example, the liquid outlet can be designed to be adjustable, and the outflow speed of the coolant can be controlled by changing the opening of the liquid outlet to meet different cooling requirements. In addition, a pressure sensor or flow meter can be set near the liquid outlet to monitor the outflow of the coolant in real time, so as to accurately control the cooling system.

[0080] 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 them. Under the concept of the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes in different aspects of the present invention as above, which are not provided in detail for the sake of simplicity. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A layered immersion liquid-cooled battery pack, comprising: A battery module (1) and a box (2), wherein the battery module (1) is located inside the box (2), and is characterized in that it also includes: A first gap (11) is provided between the battery module (1) and one end of the box (2) to form a front end flow channel; A second gap (12) is provided between the battery module (1) and the other end of the box body (2) to form a rear end flow channel; A third gap (13) is provided between the battery module (1) and the side surface of the box body (2); the battery module (1) comprises a plurality of battery columns; a fourth gap (14) is provided between the plurality of battery columns; the third gap (13) and the fourth gap (14) together constitute a plurality of side flow channels; A fifth gap (15) is provided between the battery module (1) and the upper top plate (5) of the box body (2) to form a top flow channel, and a sixth gap (16) is provided between the battery module (1) and the lower bottom plate (6) of the box body (2) to form a bottom flow channel; Liquid inlets (3) are provided on two side surfaces at one end of the box body (2), and liquid outlets (4) are provided on an upper top plate (5) and a lower bottom plate (6) at one end of the box body (2).

2. The layered immersion liquid-cooled battery pack according to claim 1, characterized in that: The number of the liquid inlets (3) is two, and the two liquid inlets (3) are symmetrically arranged on two side surfaces at one end of the box body (2).

3. The layered immersion liquid-cooled battery pack according to claim 1, characterized in that: The number of the liquid outlets (4) is two, the upper top plate (5) and the lower bottom plate (6) of the box body (2) both have a central axis, the extension direction of the central axis is parallel to the extension direction of the side flow channel, and the two liquid outlets (4) are arranged on the central axis of the upper top plate (5) and the lower bottom plate (6) at one end of the box body (2).

4. The layered immersed liquid-cooled battery pack according to claim 1, characterized in that: The distance of the first gap (11) is 26 mm.

5. The layered immersed liquid-cooled battery pack according to claim 1, characterized in that: The distance of the second gap (12) is 26 mm.

6. The layered immersion liquid-cooled battery pack according to claim 1, characterized in that: The distance between the third gap (13) and the fourth gap (14) is 8 mm.

7. The layered immersion liquid-cooled battery pack according to claim 1, characterized in that: The distance between the fifth gap (15) and the sixth gap (16) is 8 mm.

8. The layered immersion liquid-cooled battery pack according to claim 1, characterized in that: The lower base plate (6) of the box body (2) is detachably connected.

9. The layered immersion liquid-cooled battery pack according to claim 8, characterized in that: The lower base plate (6) is detachably connected via a plurality of bolts (7).

10. A layered immersion liquid cooling battery pack method, characterized in that: The method comprises: S1: The cooling liquid flows into the front flow channel from the two liquid inlets (3), is split in the front flow channel, and flows into a plurality of side flow channels, thereby cooling the side of the battery module (1); S2: The cooling liquid flows from the plurality of side channels into the rear end channel, and then flows from the rear end channel into the top channel and the bottom channel respectively, thereby cooling the top and bottom ends of the battery module (1); S3: The cooling liquid flows from the top flow channel and the bottom flow channel into the liquid outlet (4) to flow out.

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