Sodium ion battery module

Abstract

The invention relates to the technical field of batteries, in particular to a sodium ion battery module. The sodium ion battery module comprises a cooling unit and a plurality of groups of battery cell units, the plurality of groups of battery cell units are arranged in parallel at intervals along the first direction, the cooling units are locally attached to the battery cell units on the side surfaces of the battery cell units, and the side surfaces are positioned on the two sides of the battery cell units along the first direction. According to the sodium-ion battery module, the two sides of the battery cell unit are cooled through the cooling unit, so that heat dissipation of the battery cell unit in the height direction is realized, and a relatively large temperature gradient of the battery cell unit in the height direction is avoided. And the cooling unit can avoid the temperature difference of the battery cell unit in the third direction. According to the cooling unit, large-surface cooling is carried out on the side surfaces of the battery cell units, so that the overall temperature uniformity and consistency of the sodium ion battery module are improved, local overheating is avoided, thermal runaway of the battery cells is avoided, and the safety performance of the sodium ion battery module is improved. Meanwhile, the manufacturing difficulty of the cooling unit structure of the cooling plate is greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of sodium ion batteries, and in particular to a sodium ion battery module. Background Art

[0002] Sodium-ion batteries are rechargeable batteries whose working principle relies primarily on the movement of sodium ions between the positive and negative electrodes. The electrode materials used in these batteries are primarily sodium salts, which are more abundant and cheaper than lithium salts.

[0003] At present, with the development of sodium-ion battery technology, battery capacity and energy density are constantly improving, and the battery generates greater heat when working.

[0004] At present, common batteries include at least one sodium-ion battery module, and the sodium-ion battery module includes multiple groups of battery cell units arranged in parallel along a first direction, and the battery cell unit includes multiple battery cells arranged in parallel along a third direction. There are two common thermal management solutions. One is to use a cooling plate to dissipate heat from the bottom surface of the battery cell. However, since the area of ​​the cooling plate under this structure only corresponds to the bottom area of ​​each battery cell, it cannot meet the heat dissipation requirements, resulting in a large temperature gradient in the height direction of the battery cell. Another solution is to set a cooling plate between two adjacent battery cells in each sodium-ion battery module to achieve cooling in the height direction of the battery cell. However, due to the large number of battery cells, heat conduction cannot be carried out between the cooling plates, resulting in a large temperature difference in the sodium-ion battery module along the third direction. This sodium-ion battery module structure requires the provision of many cooling plates, resulting in a complex structure of the sodium-ion battery module.

[0005] In addition, the above two solutions may even lead to the risk of thermal runaway of the battery cells due to local overheating in severe cases.

[0006] In order to solve the above problems, it is urgent to provide a sodium ion battery module to solve the low heat dissipation efficiency of the sodium ion battery module, the large temperature gradient along the height direction of the battery cell, and the temperature problem of the sodium ion battery module. Summary of the Invention

[0007] The present invention aims to provide a sodium-ion battery module that dissipates heat along the height of the battery cells, thereby preventing large temperature gradients within the cells. Furthermore, the cooling unit can prevent temperature differences within the battery cells in a third direction. By providing large-surface cooling on the sides of the battery cells, the cooling unit improves the overall temperature uniformity and consistency of the sodium-ion battery module, preventing local overheating and thermal runaway of the cells, and thereby improving the safety of the sodium-ion battery module.

[0008] To achieve this object, the present invention adopts the following technical solutions: A sodium ion battery module, comprising: A plurality of groups of battery cell units, wherein the plurality of groups of battery cell units are arranged in parallel and at intervals along a first direction; and A cooling unit, wherein a portion of the cooling unit is attached to the battery cell unit at a side surface of the battery cell unit, and the side surface is located at both sides of the battery cell unit along the first direction.

[0009] As an optional solution, there is an accommodation gap between two adjacent battery core units, and the cooling unit includes: A plurality of cooling plates are inserted in the accommodating intervals or arranged on one side of the plurality of groups of the battery core units, and the side surfaces of the cooling plates are in contact with the side surfaces of the battery core units.

[0010] As an optional solution, the cooling plate includes: A body having a plurality of diversion cavities, each of which has a first sub-flow channel; and A body guide is connected to the body, and has a first liquid inlet and a first liquid outlet. The first liquid inlet and the first liquid outlet are in communication with each of the first sub-channels.

[0011] As an optional solution, the body includes: A housing, the housing surrounding the cavity; at least one first partition, the first partition extending along the third direction and disposed in the cavity, the outer periphery of the first partition being connected to the shell respectively, so as to separate the cavity into a plurality of parallel and mutually independent diversion chambers along the second direction, the diversion chambers having a second liquid inlet communicating with the first liquid inlet and a second liquid outlet communicating with the first liquid outlet; and At least one second partition, the second partition is extended along a third direction and is arranged in the diverter cavity. In the third direction, one end of the second partition close to the second liquid inlet is connected to the shell, and one end of the second partition away from the second liquid inlet is spaced apart from the shell to form a connecting port, and a first sub-channel is provided in the diverter cavity along the second liquid inlet, the connecting port and the second liquid outlet.

[0012] As an optional solution, the body further includes: At least one third partition plate is provided in the diversion cavity and extends along a third direction. In the third direction, both ends of the third partition plate are spaced apart from the shell.

[0013] As an optional solution, the guide body has: a second sub-channel, the second sub-channel extending along the second direction, the second sub-channel having a plurality of branch ports connected in sequence, each of the branch ports being connected to each of the second liquid inlets; and The third sub-channel is arranged in parallel with the second sub-channel, and has a plurality of reflux ports connected in sequence, each of the reflux ports is connected to each of the second liquid outlets.

[0014] As an optional solution, the first liquid inlet is arranged close to the diversion port at one end, and the first liquid outlet is arranged close to the reflux port at the other end.

[0015] As an optional solution, the sodium ion battery module further includes: a first communicating pipe, the first communicating pipe being in communication with the first liquid inlet of the cooling plate, the first communicating pipe having a third liquid inlet; and A second connecting tube, the second connecting tube is connected to the first liquid outlet of the cooling plate, the second connecting tube has a third liquid outlet, the first connecting tube and the second connecting tube extend along the first direction, and the first connecting tube is parallel to the second connecting tube, and the third liquid inlet and the third liquid outlet are respectively arranged near the opposite ends of the first connecting tube and the second connecting tube.

[0016] As an optional solution, the battery cell unit includes: A plurality of battery cells, wherein the plurality of battery cells are arranged in parallel along a third direction; A bottom plate, arranged at the bottom of the plurality of battery cells; end plates, located at both ends of the plurality of battery cells along the third direction, and riveted to the bottom plate; A fixing belt is buckled above the end plate and the plurality of battery cells, and both ends of the fixing belt are riveted to the end plate.

[0017] As an optional solution, in terms of electrical connection, the battery cells are connected in series rows and output rows by welding.

[0018] The beneficial effects of the present invention are: The present invention provides a sodium-ion battery module, which includes a cooling unit and multiple groups of battery cells. The multiple groups of battery cells are arranged in parallel and at intervals along a first direction, and a portion of the cooling unit is attached to the side of the battery cell, and the side is located on both sides of the battery cell along the first direction. The sodium-ion battery module is cooled on both sides of the battery cell by the cooling unit, thereby dissipating heat in the height direction of the battery cell and avoiding a large temperature gradient in the height direction of the battery cell. The cooling unit can also avoid temperature differences in the battery cell in a third direction. The cooling unit is beneficial to improving the overall temperature uniformity and consistency of the sodium-ion battery module by performing large-surface cooling on the side of the battery cell, avoiding local overheating and thermal runaway of the battery cell, and is beneficial to improving the safety performance of the sodium-ion battery module. At the same time, the manufacturing difficulty of the cooling plate cooling unit structure is greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in describing the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without any creative work.

[0020] Figure 1 1 is a schematic structural diagram of a sodium ion battery module provided by an embodiment of the present invention; Figure 2 1 is a schematic structural diagram of a cooling unit of a sodium ion battery module provided by an embodiment of the present invention; Figure 3 is a schematic cross-sectional structural diagram of a cooling plate body provided by an embodiment of the present invention; Figure 4 is a schematic cross-sectional structural diagram of a flow guide of a cooling plate provided by an embodiment of the present invention; Figure 5 It is a structural schematic diagram of a battery cell unit of a cooling plate provided in an embodiment of the present invention.

[0021] The following are marked in the figure: 100, battery cell unit; 110, accommodation space; 120, battery cell; 130, bottom plate; 140, end plate; 150, fixing belt; 200, cooling unit; 210, cooling plate; 211, body; 2111, housing; 2112, cavity; 2113, first partition; 2114, diverter cavity; 2114a, first sub-channel; 2114b, second liquid inlet; 2114c, second liquid outlet; 2114d, connecting port; 2115, second partition; 2116, third partition; 212, guide body; 2121, first liquid inlet; 2122, first liquid outlet; 2123, second sub-channel; 2123a, diverter port; 2124, third sub-channel; 2124a, reflux port; 300, first connecting pipe; 310, third liquid inlet; 320, two-way pipe; 330, three-way pipe; 340, four-way pipe; 400, second connecting pipe; 410, third liquid outlet. DETAILED DESCRIPTION

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions of the present invention, not the entire structure.

[0023] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and may refer to the interconnection of structures within two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific contexts.

[0024] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0025] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are used to refer to positions or locations based on those shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0026] like Figure 1 As shown, this embodiment provides a sodium-ion battery module comprising multiple groups of battery cell units 100. The multiple groups of battery cell units 100 are arranged parallel and spaced apart along the X direction (a first direction). Each battery cell unit 100 includes multiple battery cells 120 arranged parallel along the Y direction (a third direction). This sodium-ion battery module structure is beneficial for increasing battery capacity.

[0027] See Figure 1 and Figure 2 The sodium-ion battery module also includes a cooling unit 200. A portion of the cooling unit 200 is attached to the side of the battery cell 100, with the side of the battery cell 100 located on both sides of the battery cell 100 along the X-direction. The sodium-ion battery module uses the cooling unit 200 to cool both sides of the battery cell 100, dissipating heat in the height direction of the battery cell 100 and preventing large temperature gradients in the height direction of the battery cell 100. Furthermore, the cooling unit 200 can prevent temperature differences in the battery cell 100 along the Y-direction. By providing large-area cooling on the side of the battery cell 100, the cooling unit 200 helps improve the overall temperature uniformity and consistency of the sodium-ion battery module, prevents local overheating, and prevents thermal runaway of the battery cell 120, thereby improving the safety performance of the sodium-ion battery module. Furthermore, the structural manufacturing difficulty of the cooling unit 200 is significantly reduced.

[0028] Compared with the existing bottom surface cooling solution, the cooling unit 200 greatly increases the heat conduction area and improves the heat dissipation efficiency.

[0029] Now combined Figure 1-Figure 4 The detailed structure of the cooling unit 200 will be described.

[0030] like Figure 1-Figure 4 As shown, there is a space 110 between two adjacent battery cell units 100, and the cooling unit 200 includes multiple cooling plates 210. The cooling plates 210 are inserted into the space 110 or arranged on one side of multiple groups of battery cell units 100. The side of the battery cell unit 100 on one side of the cooling plate 210 is in contact with the side of the battery cell unit 100 to cool the battery cell unit 100 from both sides.

[0031] Specifically, the cooling plate 210 is bonded to the side of the battery cell unit 100 via an adhesive material, which helps improve the stability of the bonding and structural stability of the cooling plate 210 and the battery cell unit 100. Furthermore, the adhesive material can be a thermally conductive structural adhesive, which not only ensures the stability of the bonding between the cooling plate 210 and the battery cell unit 100, but also helps ensure heat conduction between the cooling plate 210 and the battery cell unit 100, thereby improving thermal conductivity efficiency.

[0032] Regarding the arrangement of the cooling plates 210, if the sodium-ion battery module has two battery cells 100, then there are three cooling plates 210, two of which are located on the outermost sides, and one cooling plate 210 is located in the accommodation gap 110 between the two battery cells 100. In this case, the two sides of the cooling plate 210 located in the accommodation gap 110 are respectively aligned with the side surfaces of the two battery cells 100 facing the accommodation gap 110, that is, the cooling plate 210 located in the accommodation gap 110 can cool both battery cells 100 at the same time, which is conducive to simplifying the structure. As the number of battery cells 100 increases, the number of cooling plates 210 increases accordingly.

[0033] like Figure 2-Figure 4 As shown, in some embodiments, the cooling plate 210 includes a body 211 and a flow guide 212. The body 211 has multiple diversion cavities 2114, each of which has a first sub-channel 2114a. The flow guide 212 is connected to the body 211 and has a first liquid inlet 2121 and a first liquid outlet 2122, each of which is connected to each first sub-channel 2114a. The flow guide 212 has the function of diverting the flow to the multiple diversion cavities 2114, so that the coolant entering the cooling plate 210 from the outside enters the multiple diversion cavities 2114 through the flow guide 212, thereby preventing the coolant from flowing too long in the cooling plate 210, thereby reducing the cooling effect. The structure of the diversion cavities 2114 and the flow guide 212 helps to reduce the length of the coolant flow path in the cooling plate 210, thereby improving the cooling effect of the cooling plate 210.

[0034] During application, the first liquid inlet 2121 is located below the first liquid outlet 2122, so that the pressure of the inlet liquid drives the coolant to flow into the cooling plate 210, so that the coolant is evenly distributed in the first sub-channel 2114a.

[0035] The multiple diversion cavities 2114 are independently arranged parallel to each other along the Z direction (the second direction). Each diversion cavity 2114 has a second liquid inlet 2114b and a second liquid outlet 2114c on the side near the body guide 212. Each second liquid inlet 2114b and each second liquid outlet 2114c are in communication with the body guide 212. The Z direction here represents the height of the battery cell 120. This ensures that each diversion cavity 2114 is filled with external low-temperature coolant, thereby ensuring a cooling and temperature-uniform effect along the height of the battery cell 120.

[0036] Specifically, the body 211 includes a shell 2111, at least one first partition 2113, and at least one second partition 2115. The shell 2111 encloses a cavity 2112. The first partition 2113 extends along the Y direction within the cavity 2112, with its outer periphery connected to the shell 2111, thereby dividing the cavity 2112 into a plurality of diverter cavities 2114. The second partition 2115 extends along the Y direction within the diverter cavities 2114. In the Y direction, the end of the second partition 2115 proximal to the second liquid inlet 2114b is connected to the shell 2111, while the end of the second partition 2115 distal to the second liquid inlet 2114b is spaced from the shell 2111 to form a connecting port 2114d. The diverter cavities 2114 define a first sub-channel 2114a extending along the second liquid inlet 2114b, the connecting port 2114d, and the second liquid outlet 2114c. The first partition 2113 is used to separate the cavity 2112 into multiple independent diversion chambers 2114. The second partition 2115 forms a first sub-channel 2114a within the diversion chamber 2114, forming an S-shaped flow channel for the coolant in each diversion chamber 2114. The structure of the first sub-channel 2114a significantly increases the channel length, thereby increasing the heat transfer area of ​​the cooling plate 210 within a limited area. At the same time, it can fully remove heat from the sides of the battery cell unit 100, which helps to improve the efficiency of heat exchange.

[0037] Exemplarily, the housing 2111 may be a rectangular parallelepiped structure, and the housing 2111 has each side wall of the rectangular parallelepiped.

[0038] In some embodiments, the body 211 further includes a third partition 2116, which extends along the Y direction within the diversion cavity 2114. Both ends of the third partition 2116 are spaced apart from the housing 2111 in the Y direction. The third partition 2116 separates the flow channel space between the second liquid inlet 2114b and the connecting port 2114d in the first sub-channel 2114a into multiple parallel flow channels along the Z direction. Simultaneously, the third partition 2116 separates the flow channel space between the connecting port 2114d and the second liquid outlet 2114c in the first sub-channel 2114a into multiple parallel flow channels along the Z direction. This reduces the width of the coolant flow channel in the first sub-channel 2114a, ensuring uniform coolant distribution across the height of the battery cell 100. When the channel width is sufficiently narrow, coolant flow in the first sub-channel 2114a can be achieved through capillary action, which increases the dynamics of coolant flow and contributes to energy conservation.

[0039] In some embodiments, the flow guide 212 has a second sub-channel 2123 and a third sub-channel 2124. The second sub-channel 2123 extends along the Z direction and has a plurality of sequentially connected diversion ports 2123a, each of which is connected to a respective second liquid inlet 2114b. The third sub-channel 2124 is arranged parallel to the second sub-channel 2123 and has a plurality of sequentially connected return ports 2124a, each of which is connected to a respective second liquid outlet 2114c. The guiding body 212 diverts the coolant flowing into the first liquid inlet 2121 to each second liquid inlet 2114b through the diversion port 2123a, and then enters the first sub-channel 2114a through the second liquid inlet 2114b, and then flows back from the second liquid outlet 2114c, and then flows through the reflux port 2124a into the second sub-channel 2123, and finally flows out through the first liquid outlet 2122.

[0040] Furthermore, the first liquid inlet 2121 is positioned near the diverter port 2123a at one end, and the first liquid outlet 2122 is positioned near the return port 2124a at the other end. During operation, the first liquid inlet 2121 is positioned below the first liquid outlet 2122, while the diverter port 2123a positioned below is positioned near the first liquid inlet 2121. Coolant flowing in from the first liquid inlet 2121 will first flow into the diverter chamber 2114 from the lowest diverter port 2123a. Correspondingly, the return port 2124a of the diverter chamber 2114 is the farthest from the first liquid outlet 2122 and must flow through the third sub-channel 2124 before exiting from the first liquid outlet 2122. At the same time, the diversion port 2123a located at the top is away from the first liquid inlet 2121. The coolant flowing in from the first liquid inlet 2121 passes through the second sub-channel 2123 and then flows into the diversion port 2123a, and then passes through the second liquid outlet 2114c in the diversion cavity 2114 and flows out through the return port 2124a. The return port 2124a is close to the first liquid outlet 2122.

[0041] Through the structural setting of the above-mentioned guide body 212, the return port 2124a close to the first liquid inlet 2121 is away from the first liquid outlet 2122, and the return port 2124a away from the first liquid inlet 2121 is close to the first liquid outlet 2122. This is beneficial for utilizing the structural setting of the guide body 212 to balance the flow path length of the coolant in the cooling plate 210, and is beneficial for making the coolant flow in different diversion cavities 2114 uniform, thereby ensuring the uniformity of the cooling effect of the cooling plate 210 along the Z direction.

[0042] As an optional solution, the cooling unit 200 further includes a first connecting pipe 300 and a second connecting pipe 400. The first connecting pipe 300 is connected to the first liquid inlet 2121 of the first cooling plate 210 and the first liquid inlet 2121 of the second cooling plate 210. The first connecting pipe 300 has a third liquid inlet 310. The second connecting pipe 400 is connected to the first liquid outlet 2122 of the first cooling plate 210 and the first liquid outlet 2122 of the second cooling plate 210. The second connecting pipe 400 has a third liquid outlet 410. The first connecting pipe 300 and the second connecting pipe 400 extend in the X direction and are parallel to each other. The first connecting pipe 300 and the second connecting pipe 400 are used to supply coolant to the multiple cooling plates 210 of the sodium ion battery module and to recover coolant flowing back from the multiple cooling plates 210.

[0043] Furthermore, the third liquid inlet 310 and the third liquid outlet 410 are located near opposite ends of the first connecting tube 300 and the second connecting tube 400, respectively. During operation, coolant flowing into the third liquid inlet 310 first flows into the cooling plate 210 near the third liquid inlet 310. When the coolant flowing out of this cooling plate 210 flows back into the second connecting tube 400, the distance between this interface and the third liquid outlet 410 is the farthest. Conversely, the first liquid outlet 2122 of the cooling plate 210 farthest from the third liquid inlet 310 is located near the third liquid outlet 410 of the second connecting tube 400. This structure helps ensure uniform coolant flow to each cooling plate 210 and avoids temperature differences.

[0044] As an optional solution, the cooling plate 210 away from the third liquid inlet 310 can be connected to the first connecting pipe 300 via a two-way pipe 320, and the cooling plate 210 away from the third liquid outlet 410 can be connected to the second connecting pipe 400 via a two-way pipe 320. At other locations, the cooling plate 210 can be connected to the first connecting pipe 300 and the second connecting pipe 400 via a three-way pipe 330.

[0045] Preferably, the two adjacent cooling plates 210 in the middle can also be connected to the first connecting pipe 300 and the second connecting pipe 400 via a four-way pipe 340. The four-way pipe 340 is more conducive to balancing the coolant pressure between the multiple cooling plates 210, thereby improving temperature uniformity. At the same time, the four-way pipe 340 is conducive to reducing the number of interfaces and simplifying the assembly process.

[0046] The cooling plate 210 structure saves the process and cost of mold opening, integrated welding with the box body, etc. in terms of production cost and efficiency, which is beneficial to improving assembly efficiency and reducing costs.

[0047] Now combined Figure 1 and Figure 5 The detailed structure of the battery cell unit 100 will be described.

[0048] The battery cell unit 100 includes a base plate 130, end plates 140, a fixing band 150, and multiple battery cells 120. The multiple battery cells 120 are arranged parallel to each other along the Y direction. The base plate 130 is located at the bottom of the multiple battery cells 120. The end plates 140 are located at both ends of the multiple battery cells 120 along the Y direction and are connected to the base plate 130. The fixing band 150 is buckled above the end plates 140 and the multiple battery cells 120, and the ends of the fixing band 150 are connected to the end plates 140. This structure of the battery cell unit 100 ensures that the side surfaces of the battery cell unit 100 on both sides of the X direction have no obstructing structure, so that the side surfaces can be in surface-to-surface contact with the cooling plate 210.

[0049] Furthermore, the end plate 140 is riveted to the bottom plate 130 , and the fixing belt 150 is riveted to the end plate 140 , which is beneficial to improving assembly efficiency and enhancing the overall rigidity and stability of the sodium ion battery module.

[0050] In conventional electrical connections, bolts are typically used to connect the output and series rows of the battery cell units 100. Under conditions of motion, vibration, or prolonged use, the torque of the bolts gradually dissipates, causing them to loosen. This prevents the contact surfaces of the two aluminum rows from fully contacting each other, significantly reducing the overcurrent capability. If the system is operating normally, the Joule heating caused by the increased resistance due to poor contact can cause an abnormal local temperature rise, leading to product malfunction or even alarms.

[0051] In order to solve the above problems, in this embodiment, in terms of electrical connection, the battery cell units 100 are connected to the series bus and the output bus by welding, instead of the bolt connection used in the prior art, thereby improving the stability of overcurrent and avoiding abnormal heating caused by poor contact between the buses due to bolting. Under various working conditions of movement, vibration, and long-term use, the strength of the welded rigid connection can still be maintained, thereby improving the stability of the system.

[0052] Note that the basic principles and main features of the present invention and the advantages of the present invention are shown and described above. It should be understood by those skilled in the art that the present invention is not limited to the above-described embodiments, which are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and modifications are intended to fall within the scope of the present invention as claimed, which is defined by the appended claims and their equivalents.

Claims

1. A sodium ion battery module, characterized in that: include: Multiple groups of battery cell units, wherein the multiple groups of battery cell units are arranged in parallel and at intervals along a first direction; as well as A cooling unit, wherein a portion of the cooling unit is attached to the battery cell unit at a side surface of the battery cell unit, and the side surface is located at both sides of the battery cell unit along the first direction.

2. The sodium ion battery module according to claim 1, characterized in that There is an accommodation space between two adjacent battery core units, and the cooling unit includes: A plurality of cooling plates are inserted in the accommodating intervals or arranged on one side of the plurality of groups of the battery core units, and the side surfaces of the cooling plates are in contact with the side surfaces of the battery core units.

3. The sodium ion battery module according to claim 2, wherein The cooling plate comprises: A body having a plurality of diversion cavities, each of which has a first sub-flow channel; and A body guide is connected to the body, and has a first liquid inlet and a first liquid outlet. The first liquid inlet and the first liquid outlet are in communication with each of the first sub-channels.

4. The sodium ion battery module according to claim 3, characterized in that The body comprises: A housing, the housing surrounding the cavity; at least one first partition, the first partition extending along the third direction and disposed in the cavity, the outer periphery of the first partition being connected to the shell respectively, so as to separate the cavity into a plurality of parallel and mutually independent diversion chambers along the second direction, the diversion chambers having a second liquid inlet communicating with the first liquid inlet and a second liquid outlet communicating with the first liquid outlet; and At least one second partition, the second partition is extended along a third direction and is arranged in the diverter cavity. In the third direction, one end of the second partition close to the second liquid inlet is connected to the shell, and one end of the second partition away from the second liquid inlet is spaced apart from the shell to form a connecting port, and a first sub-channel is provided in the diverter cavity along the second liquid inlet, the connecting port and the second liquid outlet.

5. The sodium ion battery module according to claim 4, characterized in that: The body also includes: At least one third partition plate is provided in the diversion cavity and extends along a third direction. In the third direction, both ends of the third partition plate are spaced apart from the shell.

6. The sodium ion battery module according to claim 4, characterized in that The guiding body has: a second sub-channel, the second sub-channel extending along the second direction, the second sub-channel having a plurality of branch ports connected in sequence, each of the branch ports being connected to each of the second liquid inlets; as well as The third sub-channel is arranged in parallel with the second sub-channel, and has a plurality of reflux ports connected in sequence, each of the reflux ports is connected to each of the second liquid outlets.

7. The sodium ion battery module according to claim 6, characterized in that: The first liquid inlet is arranged close to the diversion port at one end, and the first liquid outlet is arranged close to the reflux port at the other end.

8. The sodium ion battery module according to any one of claims 2 to 7, wherein: The sodium ion battery module further includes: a first communicating pipe, the first communicating pipe being in communication with the first liquid inlet of the cooling plate, the first communicating pipe having a third liquid inlet; and A second connecting tube, the second connecting tube is connected to the first liquid outlet of the cooling plate, the second connecting tube has a third liquid outlet, the first connecting tube and the second connecting tube extend along the first direction, and the first connecting tube is parallel to the second connecting tube, and the third liquid inlet and the third liquid outlet are respectively arranged near the opposite ends of the first connecting tube and the second connecting tube.

9. The sodium ion battery module according to any one of claims 1 to 7, characterized in that: The battery cell unit comprises: A plurality of battery cells, wherein the plurality of battery cells are arranged in parallel along a third direction; A bottom plate, arranged at the bottom of the plurality of battery cells; end plates, located at both ends of the plurality of battery cells along the third direction, and riveted to the bottom plate; A fixing belt is buckled above the end plate and the plurality of battery cells, and both ends of the fixing belt are riveted to the end plate.

10. The sodium ion battery module according to any one of claims 1 to 7, characterized in that: In terms of electrical connection, the battery cells are connected in series rows and output rows by welding.

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