Immersed battery system

Abstract

The utility model provides an immersed battery system. The immersed battery system comprises a plurality of battery cells which are arranged in sequence, each battery cell comprises a shell and a pole group arranged in the shell, the large-surface side walls of every two adjacent shells are attached to each other and are provided with flow channels and sealing cavities, the flow channels are used for circulating immersion liquid, and the sealing cavities are filled with phase change material layers; the flow channel and the sealing cavity extend in the length direction of the battery cell, and the flow channel and the sealing cavity are arranged at an interval in the height direction of the battery cell. According to the immersed battery system disclosed by the utility model, the heat exchange area of the battery cell can be increased, the heat of the battery cell can be taken away by combining the immersion liquid with the phase-change material layer when the calorific value of the battery system is relatively large, and the heat emitted by the battery cell is absorbed only through the phase-change material layer when the calorific value of the battery system is small, so that an effect of assisting heat management is achieved; and the phase change material layer can store heat and can also preserve heat of the battery cell when the temperature is low, so that the heat management effect is ensured, and the operation and maintenance cost of the system is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of immersion batteries, in particular to an immersion battery system. Background Art

[0002] The battery system is a core component of electric vehicles. To achieve a longer driving range, more cells are needed to increase the energy density of the battery system. To ensure battery system safety, timely heat dissipation from the cells within the battery system is necessary. Traditionally, battery systems have been immersed in liquid to cool the cells. However, this cooling method requires a constant flow of liquid to remove heat, resulting in poor local thermal management and high operational and maintenance costs. Utility Model Content

[0003] In view of this, the present invention aims to provide an immersion battery system that can reduce system operation and maintenance costs while ensuring thermal management effects.

[0004] In order to achieve the above-mentioned purpose, the technical solution of the utility model is achieved as follows:

[0005] An immersion battery system includes a plurality of battery cells arranged in sequence;

[0006] Each of the battery cells includes a shell and an electrode group disposed within the shell. The large side walls of two adjacent shells are bonded to each other and are provided with a flow channel and a sealed cavity. The flow channel is used to circulate immersion liquid, and the sealed cavity is filled with a phase change material layer.

[0007] The flow channel and the sealed cavity are both extended along the length direction of the battery core, and in the height direction of the battery core, the flow channel and the sealed cavity are spaced apart.

[0008] Furthermore, each of the large side walls is provided with a plurality of limiting ribs protruding along the arrangement direction of the battery cells, and the plurality of limiting ribs are arranged at intervals along the height direction of the battery cells, and each of the limiting ribs is provided with a groove concave along the arrangement direction of the battery cells, and a flow groove is formed between two adjacent limiting ribs; when two adjacent shells are fitted together, the two opposite flow grooves are docked to form the flow channel, and the two opposite grooves are docked to form the sealed cavity.

[0009] Furthermore, the battery cell is a ternary lithium battery cell; in the arrangement direction of the battery cells, the protruding size d of each limiting rib satisfies the relationship: d = (5a + 0.5) / 2, wherein a is the nickel content, and the value is between 0.5-0.9.

[0010] Furthermore, the plurality of limiting ribs include a first limiting rib located in the middle of the large side wall along the height direction of the battery cell, and a second limiting rib located on the upper and lower sides of the first limiting rib, and the flow groove is formed between the first limiting rib and each of the second limiting ribs, and the groove is provided on the first limiting rib and each of the second limiting ribs.

[0011] Furthermore, the upper and lower side edges of the first limiting rib are both straight, the side edge of each second limiting rib facing the first limiting rib is arc-shaped, and the two second limiting ribs are arranged opposite to each other; in the height direction of the battery cell, the width dimension w of the middle part of each second limiting rib is between 8-10mm.

[0012] Furthermore, in the height direction of the battery cell, the width dimension h2 of each first limiting rib and the height dimension y of the battery cell satisfy the relationship: h2=y / 4; and / or the height dimension y of the battery cell is between 90-150 mm.

[0013] Furthermore, in the height direction of the battery cell, the height dimension y of the battery cell, the width dimension w of the middle part of each second limiting rib, the width dimension h2 of the first limiting rib and the width dimension h1 of the middle part of each flow channel satisfy the relationship: 2w+2h1+h2=y.

[0014] Furthermore, in the height direction of the battery core, the width dimension h3 of the end portions of each of the flow channels is smaller than the width dimension h1 of the middle portion of each of the flow channels.

[0015] Furthermore, in the height direction of the battery core, the difference between the width dimension h3 of the end portions of each flow channel and the width dimension h1 of the middle portion of each flow channel is between 5-15 mm.

[0016] Furthermore, the length dimension x of the battery core is between 200-400 mm; and / or the shell is formed by integral extrusion of aluminum material.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] The immersion battery system described in the present invention, by providing a flow channel for circulating immersion liquid and a sealed cavity filled with a phase change material layer between the large side walls of each battery cell, can not only increase the heat exchange area of ​​the battery cell, but also, when the battery system is running at high load and generating a large amount of heat, the circulation of the immersion liquid can be started, and the heat of the battery cell can be taken away by the immersion liquid combined with the phase change material layer. When the battery system is running at low load and generating a small amount of heat, the heat emitted by the battery cell is absorbed only by the phase change material layer, thereby playing a role of auxiliary thermal management. At the same time, the phase change material layer itself can store heat and can also play a role of heat preservation for the battery cell when the temperature is low, thereby reducing the system operation and maintenance costs while ensuring the thermal management effect.

[0019] In addition, the provision of multiple limiting ribs with grooves is not only conducive to the formation of flow channels and sealed cavities, but also to ensuring the structural strength of the shell. The battery cell is a ternary lithium battery cell, and the protruding size d of each limiting rib satisfies the relationship: d = (5a + 0.5) / 2, which can ensure the structural strength of the shell while also allowing the flow channel to have sufficient flow, which is conducive to meeting the thermal management requirements of the battery system. The multiple limiting ribs include a first limiting rib located in the middle of the large side wall, and a second limiting rib located on the upper and lower sides of the first limiting rib. The first limiting rib can mainly absorb the expansion force of the battery cell during cycling, thereby improving the life of the battery cell, and the second limiting rib can ensure the structural strength of the shell and provide sufficient filling space for the phase change material layer.

[0020] Furthermore, in the height direction of the battery cell, the width dimension w of the middle portion of each second limiting rib is between 8-10mm, which is beneficial for increasing the flow channel area and improving the heat exchange effect in the middle area of ​​the battery cell with high heat generation. It can also prevent the shell from being crushed and ensure the structural strength of the shell. The height dimension y of the battery cell is between 90-150mm, which can prevent the area of ​​the large side wall of the battery cell from being too large, resulting in the flow channel and phase change material layer being unable to meet the heat exchange requirements. In the height direction of the battery cell, the width dimension h2 of each first limiting rib and the height dimension y of the battery cell satisfy the relationship: h2 = y / 4. This can ensure the heat exchange effect while resisting the expansion force of the battery cell and meet the thermal management requirements.

[0021] In addition, in the height direction of the battery cell, the width dimension h3 at the ends of each flow channel is smaller than the width dimension h1 in the middle of each flow channel, which can make the immersion liquid area in the middle region in the length direction of the battery cell larger than the area of ​​the two end regions, thereby improving the heat exchange effect in the middle of the battery cell. In the height direction of the battery cell, the difference between the width dimension h3 at the ends of each flow channel and the width dimension h1 in the middle of each flow channel is between 5-15mm, which can make the immersion liquid have better flow properties and help improve the temperature consistency of the battery cell. The length dimension x of the battery cell is between 200-400mm, which can avoid the flow channel being too long, resulting in a high temperature of the downstream immersion liquid, resulting in reduced thermal management performance. The shell is made of aluminum material and extruded in one piece, which is conducive to ensuring the molding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0023] Figure 1 This is an exploded view of the battery cell according to an embodiment of the present utility model;

[0024] Figure 2 This is a schematic structural diagram of the flow channel according to an embodiment of the present utility model;

[0025] Figure 3 and Figure 4 Schematic diagram of the structure of the housing according to the embodiment of the present utility model at different viewing angles;

[0026] Description of reference numerals:

[0027] 1. Shell; 11. Large side wall; 111. First limiting rib; 112. Second limiting rib; 113. Flow channel; 1131. Flow slot; 114. Groove; 12. Top wall; 13. Bottom wall; 2. Electrode group; 3. End cap; 4. Phase change material layer;

[0028] d, the protruding dimension of the limiting rib; w, the width dimension of the middle part of the second limiting rib; h1, the width dimension of the middle part of the flow channel; h2, the width dimension of the first limiting rib; h3, the width dimension of the two ends of the flow channel; x, the length dimension of the battery cell; y, the height dimension of the battery cell. DETAILED DESCRIPTION

[0029] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0030] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," and "outer" appear to indicate orientation or positional relationships, these are based on the orientation or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, if terms such as "first" and "second" appear, they are used solely for descriptive purposes and should not be construed as indicating or implying relative importance.

[0031] Furthermore, in the description of this utility model, unless otherwise explicitly defined, the terms "mounted," "connected," "connection," and "connector" should be interpreted broadly. For example, they can refer to fixed, removable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on specific circumstances.

[0032] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0033] This embodiment relates to an immersion battery system, which can ensure the system thermal management effect by combining immersion liquid with phase change material, and solve the problems of poor heat exchange effect and high operation and maintenance costs in traditional technology that only uses immersion liquid for heat exchange.

[0034] In terms of overall structure, Figures 1 to 4 As shown, the immersion battery system of this embodiment includes multiple battery cells arranged in sequence. Each battery cell includes a housing 1 and an electrode group 2 disposed within the housing 1. The large side walls 11 of two adjacent housings 1 are bonded together and provided with a flow channel 113 and a sealed cavity. The flow channel 113 is used to circulate the immersion liquid, and the sealed cavity is filled with a phase change material layer 4. Furthermore, the flow channel 113 and the sealed cavity extend along the length of the battery cell, and are spaced apart in the height direction of the battery cell.

[0035] At this time, as set above, a flow channel 113 for circulating immersion liquid and a sealed cavity filled with a phase change material layer 4 can be set between the large side walls 11 of each battery cell. This not only increases the heat exchange area of ​​the battery cell, but also can start the circulation of the immersion liquid when the battery system is running at a high load and the heat generation is large. The heat of the battery cell is taken away by the immersion liquid combined with the phase change material layer 4. When the battery system is running at a low load and the heat generation is small, the heat emitted by the battery cell is absorbed only by the phase change material layer 4, which plays a role in auxiliary thermal management. At the same time, the phase change material layer 4 itself can store heat, and can also keep the battery cell warm when the temperature is low. This can reduce the system operation and maintenance costs while ensuring the thermal management effect.

[0036] It is understandable that the battery system of this embodiment requires immersion fluid for thermal management when the cell generates little heat or needs to be kept warm. Furthermore, the middle of the cell generates the most heat. If only immersion fluid is used for cooling, the immersion fluid simultaneously exchanges heat with areas of varying heat generation, which can easily lead to poor local heat exchange. It may take a long time for the cell temperature to reach a relatively consistent level, leading to unsatisfactory local thermal management and high operation and maintenance costs. The provision of phase change material layer 4 can assist in thermal management in the battery system, improving the cell's thermal insulation performance, resolving the problem of unsatisfactory local thermal management, and reducing operation and maintenance costs.

[0037] It is worth noting that the directional terms used in the embodiments, such as "up, down, left, right, front, and back," are defined based on the height direction (also known as the up-down direction, or the Z direction of the battery cell), thickness direction (also known as the width direction, or the Y direction of the battery cell), and length direction (also known as the front-to-back direction, or the X direction of the battery cell). Furthermore, in the specific structure, the battery cell arrangement direction of this embodiment is also the thickness direction of the battery cell, and the large side wall 11 refers to the two side walls of the housing 1 along the thickness direction of the battery cell, and is also the side wall with the largest surface area among the side walls of the housing 1.

[0038] In addition, the housing 1 also includes a top wall 12 located at the top of the two large side walls 11, and a bottom wall 13 located at the bottom of the two large side walls 11, giving the housing 1 an overall visually rectangular shape. Furthermore, the battery cell of this embodiment also includes end caps 3 located at both ends of the housing 1 along its length.

[0039] Of course, relevant structural parts not mentioned in the battery system of this embodiment can refer to the various structures in power batteries and battery packs familiar to those skilled in the art. For example, the phase change material layer 4 can be made of phase change materials such as paraffin that are familiar to those skilled in the art. At the same time, the battery system also includes a battery case, in which each battery cell is arranged, and the battery system is also equipped with a circulation system for realizing the circulation of the immersion liquid, etc., which will not be described in detail here.

[0040] Based on the above overall introduction, specifically, in this embodiment, as a preferred implementation form, as Figure 1 and Figure 2 As shown, each major sidewall 11 is provided with a plurality of limiting ribs protruding along the direction of the cell arrangement. The plurality of limiting ribs are spaced apart along the height direction of the cell, and each limiting rib is provided with a groove 114 concave in the direction of the cell arrangement. A flow slot 1131 is formed between two adjacent limiting ribs. When two adjacent housings 1 are fitted together, the two opposing flow slots 1131 mate to form the flow channel 113, and the two opposing grooves 114 mate to form a sealed cavity.

[0041] The main benefit of such a configuration is that, by providing a plurality of limiting ribs with grooves 114 , it is not only conducive to forming the flow channel 113 and the sealing cavity, but also can ensure the structural strength of the shell 1 .

[0042] In this embodiment, as a preferred implementation form, the battery system is preferably made of ternary lithium batteries. The main reason is that ternary lithium batteries have large thermal management requirements. However, the battery system of this embodiment is not limited to the use of ternary lithium batteries, and other batteries such as lithium iron phosphate and lithium manganese oxide can also be used.

[0043] And as Figure 3 As shown, in the direction of the battery cell arrangement, the protruding dimension d of each limiting rib satisfies the relationship: d = (5a + 0.5) / 2, where a is the nickel content and has a value between 0.5 and 0.9. The main advantage of this setting is that the protruding dimension d of each limiting rib can be between 1.5 and 2.5, while ensuring the structural strength of the shell 1, it can also ensure that the flow channel 113 has sufficient flow, which is conducive to meeting the thermal management requirements of the battery system.

[0044] Where a can be 0.5, 0.7, or 0.9, and d can be 1.5, 2, or 2.5, to achieve the optimal performance. It is worth mentioning that when the battery system of this embodiment is made with other battery cells, the protruding dimension d of each limiting rib can be limited to between 1.5 and 2.5, so that the battery cell has both good structural strength and thermal management.

[0045] In addition, in this embodiment, as a preferred implementation form, Figures 1 to 4 As shown in the figure, the multiple limiting ribs include a first limiting rib 111 located in the middle of the large side wall 11 along the height direction of the battery cell, and a second limiting rib 112 located on the upper and lower sides of the first limiting rib 111. A flow groove 1131 is formed between the first limiting rib 111 and each second limiting rib 112, and a groove 114 is provided on the first limiting rib 111 and each second limiting rib 112.

[0046] The multiple limiting ribs include a first limiting rib 111 located in the middle of the large side wall 11, and a second limiting rib 112 located on the upper and lower sides of the first limiting rib 111. The first limiting rib 111 can mainly absorb the expansion force of the battery cell during circulation, thereby improving the life of the battery cell, and the second limiting rib 112 can ensure the structural strength of the shell 1 and provide sufficient filling space for the phase change material layer 4.

[0047] It is understandable that the number of first limiting ribs 111 should not be too large, as too many will make processing difficult, increase the processing volume, and lead to higher costs. It will also occupy the flow space of the immersion liquid and reduce thermal management performance. In this embodiment, it is preferred to provide one first limiting rib 111. Moreover, one first limiting rib 111 and two second limiting ribs 112 cooperate to form two flow channels 113 and three grooves 114, which can ensure that the phase change material layer 4 can regulate the temperature and save energy when the temperature is low, and can also meet the needs of cooling when the temperature is high through the cooperation of the immersion liquid and the phase change material layer 4, thereby achieving good thermal management effect.

[0048] Specifically, in this embodiment, as a preferred implementation form, Figure 1 As shown, the upper and lower side edges of the first limiting rib 111 are both straight, and the side edges of each second limiting rib 112 facing the first limiting rib 111 are arc-shaped, and the two second limiting ribs 112 are arranged opposite to each other, so that the top edge of the upper flow channel 113 is arc-shaped, and the bottom edge is straight, and the lower flow channel 113 is radially arranged with the upper flow channel 113, and the top edge of the lower flow channel 113 is straight, and the bottom edge is arc-shaped, thereby increasing the flow area of ​​the flow channel 113 in the middle part in the length direction of the battery cell, thereby improving the heat exchange effect in the middle part of the battery cell.

[0049] Moreover, in the height direction of the battery cell, the width dimension w of the middle part of each second limiting rib 112 is preferably set between 8-10 mm, which can help ensure that the middle part of the flow channel 113 has sufficient flow area, ensuring the heat exchange effect on the middle area of ​​the battery cell with high heat generation. At the same time, it can also avoid the width dimension of the middle part of each second limiting part being too small, which may cause the shell 1 to be crushed, thereby ensuring the structural strength of the shell 1.

[0050] In specific implementation, in this embodiment, the width dimension w of the middle portion of each second limiting rib 112 can be specifically set to 8 mm, 9 mm or 10 mm, in order to achieve a relatively optimal use effect.

[0051] In this embodiment, as a preferred implementation form, the height dimension y of the battery cell is between 90-150 mm to avoid the area of ​​the large side wall 11 of the battery cell being too large, making it difficult to ensure its own structural strength, and causing the flow channel 113 and the phase change material layer 4 to be unable to meet the heat exchange requirements.

[0052] Similarly, as a preferred implementation form, in the height direction of the battery cell, the width dimension h2 of each first limiting rib 111 and the height dimension y of the battery cell satisfy the relationship: h2 = y / 4, which can make the value of h2 between 22.5-37.5mm, while resisting the expansion force of the battery cell, ensuring the heat exchange effect and meeting the thermal management requirements.

[0053] The height dimension y of the above-mentioned battery cell can be specifically taken as 90mm, 120mm or 150mm. At this time, the specific value corresponding to h2 is 22.5mm, 30mm or 37.5mm, so as to make the battery system have better use effect and longer product life.

[0054] It is worth mentioning that the greater the expansion force of the battery cell, the larger the width dimension h2 of the first limiting rib 111 needs to be. Otherwise, it will not be able to resist the expansion force of the battery cell, because the first limiting rib 111 will be deformed, which will affect the flow of the immersion liquid and the life of the battery cell. However, the increase in h2 will increase the ability to resist the expansion force, but it will occupy the flow area of ​​the immersion liquid and reduce the thermal management performance. Therefore, 22.5-37.5mm is the value range of the width dimension h2 of the first limiting rib 111 that can achieve the relatively optimal use effect.

[0055] See also Figure 4 As shown, in this embodiment, as a preferred implementation form, in the height direction of the battery cell, the height dimension y of the battery cell, the width dimension w of the middle part of each second limiting rib 112, the width dimension h2 of the first limiting rib 111 and the width dimension h1 of the middle part of each flow channel 113 satisfy the relationship: 2w+2h1+h2=y.

[0056] In this way, based on the fact that the height dimension y of the battery cell is between 90-150 mm, the width dimension h2 of each first limiting rib 111 is between 22.5-37.5 mm, and the width dimension w of the middle part of each second limiting rib 112 is between 8-10 mm, the value of h1 is between 25.75-48.25 mm, which is conducive to determining the optimal design size of the battery cell and helps to improve the quality and production of the battery cell.

[0057] In this embodiment, as a preferred implementation form, in the height direction of the battery cell, the width dimension h3 of the two end portions of each flow channel 113 is smaller than the width dimension h1 of the middle portion of each flow channel 113. Thus, the immersion liquid area of ​​the middle region in the length direction of the battery cell can be larger than the area of ​​the two end regions, thereby improving the heat exchange effect on the middle portion of the battery cell.

[0058] At this time, as a preferred setting form, in this embodiment, in the height direction of the battery cell, the difference between the width dimension h3 at both ends of each flow channel 113 and the width dimension h1 in the middle of each flow channel 113 is between 5-15 mm, so that the immersion liquid has better flow properties and is conducive to improving the temperature consistency of the battery cell.

[0059] In specific implementations, the difference between the width h3 at the ends of each flow channel 113 and the width h1 in the middle of each flow channel 113 can be set to 5 mm, 10 mm, or 15 mm to achieve relatively optimal cell temperature balance. The value of h3 should not be too small, as this will result in a narrow immersion liquid inlet and an uneven arc transition between the upper and lower second limiting ribs 112, affecting the flow of the immersion liquid.

[0060] In addition, in this embodiment, as a preferred implementation form, the length of the battery cell is between 200-400 mm, and can be specifically preferably 200 mm, 300 mm or 400 mm. Such a setting can avoid the flow channel 113 being too long, resulting in a high temperature of the downstream immersion liquid, resulting in reduced thermal management performance.

[0061] It is worth mentioning that the length dimension x of the battery cell should not be too large. If x>400, the horizontal flow path of the immersion fluid will increase, resulting in a higher temperature of the downstream immersion fluid and reduced thermal management performance. If x<200, the immersion fluid heat exchange time will be shortened and the immersion fluid utilization rate will be reduced.

[0062] At the same time, and as a preferred embodiment, the housing 1 is integrally extruded from aluminum to ensure molding quality. Specifically, the housing 1 and its first and second limiting ribs 111, 112 can be integrally extruded from aluminum to ensure molding quality while also reducing the weight of the battery cell and battery system.

[0063] The immersion battery system of this embodiment, by providing a flow channel 113 for circulating immersion liquid and a sealed cavity filled with a phase change material layer 4 between the large side walls 11 of each battery cell, can not only increase the heat exchange area of ​​the battery cell, but also, when the battery system is running at high load and generating a large amount of heat, the circulation of the immersion liquid can be started, and the heat of the battery cell can be taken away by the immersion liquid combined with the phase change material layer 4. When the battery system is running at low load and generating little heat, the heat generated by the battery cell is absorbed only by the phase change material layer 4, thereby playing a role in auxiliary thermal management. At the same time, the phase change material layer 4 itself can store heat and can also play a role in keeping the battery cell warm when the temperature is low, thereby reducing the system operation and maintenance costs while ensuring the thermal management effect.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An immersion battery system, characterized in that: comprising a plurality of battery cells arranged in sequence; Each of the battery cells includes a shell and an electrode group disposed within the shell. The large side walls of two adjacent shells are bonded to each other and are provided with a flow channel and a sealed cavity. The flow channel is used to circulate immersion liquid, and the sealed cavity is filled with a phase change material layer. The flow channel and the sealed cavity are both extended along the length direction of the battery core, and in the height direction of the battery core, the flow channel and the sealed cavity are spaced apart.

2. The submerged battery system according to claim 1, wherein: Each of the large side walls is provided with a plurality of limiting ribs protruding along the arrangement direction of the battery cells, the plurality of limiting ribs are arranged at intervals along the height direction of the battery cells, and each of the limiting ribs is provided with a groove concave in the arrangement direction of the battery cells, and a flow groove is formed between two adjacent limiting ribs; When two adjacent shells are fitted together, the two opposite flow grooves are connected to form the flow channel, and the two opposite grooves are connected to form the sealed cavity.

3. The submerged battery system according to claim 2, wherein: The battery cell is a ternary lithium battery cell; In the direction of arrangement of the battery cells, the protruding dimension d of each limiting rib satisfies the relationship: d=(5a+0.5) / 2, wherein a is the nickel content and has a value between 0.5-0.

9.

4. The submerged battery system according to claim 2, wherein: The multiple limiting ribs include a first limiting rib located in the middle of the large side wall along the height direction of the battery cell, and a second limiting rib located on the upper and lower sides of the first limiting rib. The flow groove is formed between the first limiting rib and each of the second limiting ribs, and the groove is provided on the first limiting rib and each of the second limiting ribs.

5. The submerged battery system according to claim 4, wherein: The upper and lower sides of the first limiting rib are both straight, the side of each second limiting rib facing the first limiting rib is arc-shaped, and the two second limiting ribs are arranged opposite to each other; In the height direction of the battery core, a width dimension w of the middle portion of each of the second limiting ribs is between 8 mm and 10 mm.

6. The submerged battery system according to claim 5, characterized in that: In the height direction of the battery cell, the width h2 of each first limiting rib and the height y of the battery cell satisfy the relationship: h2=y / 4; and / or, The height dimension y of the battery core is between 90-150 mm.

7. The submerged battery system according to claim 6, wherein: In the height direction of the battery cell, the height dimension y of the battery cell, the width dimension w of the middle portion of each second limiting rib, the width dimension h2 of the first limiting rib and the width dimension h1 of the middle portion of each flow channel satisfy the relationship: 2w+2h1+h2=y.

8. The submerged battery system according to claim 7, wherein: In the height direction of the battery core, the width dimension h3 of the end portions of each of the flow channels is smaller than the width dimension h1 of the middle portion of each of the flow channels.

9. The submerged battery system according to claim 8, wherein: In the height direction of the battery core, a difference between a width dimension h3 at both ends of each flow channel and a width dimension h1 in the middle of each flow channel is between 5 and 15 mm.

10. The submerged battery system according to any one of claims 1 to 9, characterized in that: The length dimension x of the battery cell is between 200-400 mm; and / or, The shell is formed by integral extrusion of aluminum material.

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