Immersed battery pack

Abstract

The utility model provides an immersed battery pack, which relates to the technical field of batteries, and comprises a box body, a battery module and a liquid inlet assembly, the side wall of one end of the box body is provided with a liquid inlet interface and a liquid outlet interface, the liquid outlet interface is positioned above the liquid inlet interface, and the battery module is positioned inside the box body; the liquid inlet assembly comprises a main pipeline and a branch pipeline which are arranged on the bottom face of the box body, and the main pipeline is horizontally arranged at the end, close to the liquid inlet connector, of the box body and connected with the liquid inlet connector. The branch pipelines are arranged at equal intervals in the width direction of the box body, one ends of the branch pipelines are connected with the main pipeline, the other ends of the branch pipelines extend to the end away from the liquid inlet connector, and liquid outlets are formed in the far ends. Cooling liquid is distributed to the branch pipelines through the main pipeline, flows to the far end of the box body and then flows back, and in the backflow process, the cooling liquid exchanges heat with the battery module to take away heat generated by the battery. And the cooling liquid flows in the whole box body, contacts and cools the battery module, so that uniform temperature distribution is ensured, local overheating is effectively avoided, each battery monomer in the battery pack is cooled in a balanced manner, and the heat dissipation efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a kind of immersion battery pack. BACKGROUND

[0002] With the continuous requirement of battery performance and safety in the field of electric vehicles and energy storage equipment, the heat dissipation problem of battery pack becomes particularly important. Battery pack is usually composed of multiple battery monomers, and the balance of the internal temperature of the battery pack directly affects the performance, life and safety of the battery. In order to solve the problem of heat dissipation of battery pack, liquid cooling technology is widely used in the cooling system of battery pack. The liquid cooling system circulates cooling liquid in the battery pack to take away the heat generated by the battery pack, thereby keeping the battery working within the appropriate temperature range.

[0003] In the prior art, the immersion liquid-cooled battery pack is a relatively common structure. This type of battery pack is usually designed with a box, and the cooling liquid circulates through the inlet and outlet in the battery pack box. However, this design still has some problems, which are embodied in the following aspects:

[0004] In order to ensure that the cooling liquid can effectively flow into the battery pack and take away the heat, the traditional design usually sets the water inlet and outlet at both ends of the battery pack box. This design may cause uneven flow of cooling liquid inside the box, resulting in high temperature at the outlet end and low temperature at the inlet end, causing a large temperature difference. The large temperature difference not only affects the cooling effect, but also may cause uneven temperature distribution of the battery monomers, thereby affecting the charging and discharging efficiency and service life of the battery.

[0005] In addition, the inlet and outlet are usually arranged at both ends of the battery pack, which requires a relatively long pipeline for connection. This not only increases the complexity of the pipeline, but also makes the layout of the cooling system less compact, which may occupy the effective space of the battery pack, thereby affecting the overall energy density of the battery pack. In addition, long-distance pipeline connection may increase the flow resistance of the cooling liquid, thereby reducing the cooling efficiency.

[0006] In order to solve the above problems, some design schemes attempt to arrange the inlet and outlet on the same side to facilitate the layout of the pipeline and the flow of the cooling liquid. However, in order to ensure that the cooling liquid can flow uniformly inside the battery pack box and ensure that each battery monomer can be fully cooled, flow baffles are usually arranged inside the box. Although these flow baffles can improve the uniformity of the cooling liquid flow, they also occupy the internal space of the battery pack, thereby reducing the energy density of the battery pack. SUMMARY

[0007] Therefore, the utility model provides an immersion battery pack, which aims to solve the problem of uneven heat dissipation effect of the existing battery pack.

[0008] The technical scheme of the utility model is implemented as follows:

[0009] The utility model provides a kind of submerged battery pack, comprising:

[0010] Box, the same end side wall of the box length direction is separately provided with liquid inlet and liquid outlet, the liquid outlet is located above the liquid inlet:

[0011] Battery module, is set to the inside of the box;

[0012] Liquid inlet component, the liquid inlet component includes the main pipeline and branch pipeline of setting in the bottom surface of box, the main pipeline is horizontally located in the one end of box close to liquid inlet, liquid inlet is connected with main pipeline, branch pipeline is equidistantly provided with multiple along the width direction of box, and one end of multiple branch pipelines is connected with main pipeline respectively, and the other end extends to the one end of box away from liquid inlet along the length direction of box, and the one end away from main pipeline of branch pipeline has liquid outlet.

[0013] On the basis of above technical scheme, preferably, the bottom surface of the box is provided with a plurality of accommodating grooves along the length direction thereof, and the branch pipeline is horizontally fixedly arranged in the accommodating groove.

[0014] On the basis of above technical scheme, preferably, the branch pipeline is a circular tube or a square tube.

[0015] On the basis of above technical scheme, preferably, the depth of the accommodating groove is greater than the height from the top surface of the branch pipeline to the top surface of the accommodating groove.

[0016] On the basis of above technical scheme, preferably, the liquid inlet component further comprises a distribution pipe, and the main pipeline is connected with the branch pipeline in the accommodating groove of the distribution pipe.

[0017] On the basis of above technical scheme, preferably, chambers are arranged between the battery module and the front side wall of the box, and the main pipeline is located at the bottom of the chamber.

[0018] On the basis of above technical scheme, preferably, a plurality of battery modules are arranged, and the plurality of battery modules are arranged side by side in the width direction of the box inside, the battery module comprises two end plates and a plurality of single cells, the plurality of single cells are arranged between the two end plates in the length direction of the box, a bandage is arranged around the outside of the end plate and the plurality of single cells, heat dissipation fins are arranged between the single cells, heat conduction fins are formed on the outside of the single cells at both ends of the heat dissipation fins, and the heat conduction fins are attached to the side wall of the battery module.

[0019] On the basis of above technical scheme, preferably, a plurality of liquid passing grooves are equidistantly arranged in the height direction of the single cell, and the liquid passing grooves are horizontally arranged in the width direction of the single cell.

[0020] On the basis of the above technical scheme, preferably, the upper part of the chamber is further provided with a liquid outlet pipe fixedly connected with the side wall of the box, the liquid outlet pipe is parallel to the main pipeline, a plurality of liquid inlets are arranged on the liquid outlet pipe at intervals, and the liquid outlet pipe is in communication with the liquid outlet interface.

[0021] On the basis of the above technical scheme, preferably, the inside of the chamber and the outside of the corresponding box are provided with a BMS management unit.

[0022] Compared with the prior art, the utility model has the following beneficial effects:

[0023] (1) By arranging a plurality of branch pipelines at equal intervals on the bottom surface of the box, the cooling liquid is distributed to the plurality of branch pipelines through the main pipeline, and the cooling liquid flows in the branch pipeline from the bottom surface to the other end away from the liquid inlet. Once the cooling liquid flows to the far end of the box, it starts to flow back. In the process of flowing back, the cooling liquid can take away the heat generated inside the battery module. Because the cooling liquid flows through the entire box, it contacts every surface of the battery module. Therefore, not only can the single battery be effectively cooled, but also the heat can be taken away and the uniformity of temperature distribution is ensured. When the cooling liquid flows back from the far end, it continuously exchanges heat with the battery module. Because of the uniformity of the cooling liquid flow, it can evenly cool every part of the battery pack, preventing the situation that the heat dissipation effect is uneven due to the excessively high temperature of a certain local part. The flow of the entire cooling liquid forms a circulation system, so that every battery monomer in the battery pack can be fully and evenly cooled.

[0024] (2) By hiding the branch pipeline in the containing groove, a complex flow partition plate is not needed, the occupation of the internal space of the box is reduced, and the energy density of the battery pack is improved. Because the pipeline design is compact, the cooling system is efficient and occupies small space, so that the battery pack can accommodate more single battery cells and the overall energy density of the battery pack is improved.

[0025] (3) By making the depth of the containing groove greater than the height from the top surface of the branch pipeline to the top surface of the containing groove. By this arrangement, after the cooling liquid is filled into the box, it can flow in the containing groove. In this process, the cooling liquid cools the bottom surface of the battery module in the containing groove, ensuring that the bottom surface of the battery module is well cooled in the heat exchange process and preventing the temperature of the bottom surface from being too high, thereby avoiding the imbalance of the battery temperature.

[0026] (4) By arranging a plurality of liquid passing grooves at equal intervals along the height direction of the single battery cell on the heat dissipation fin, and horizontally arranging the liquid passing grooves along the width direction of the single battery cell. By this structure, when the cooling liquid flows in the box, it can flow through the liquid passing grooves. The cooling liquid directly takes away the heat released by the single battery cell to the heat dissipation fin in time, greatly improving the heat dissipation efficiency of the single battery cell. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings described below are only some of the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0028] Figure 1 The first perspective view of the immersed battery pack is disclosed in the present application.

[0029] Figure 2 The second perspective view of the immersed battery pack is disclosed in the present application.

[0030] Figure 3 The assembly structure diagram of the box and the liquid inlet assembly is disclosed in the present application.

[0031] Figure 4 The three-dimensional structure diagram of the battery module is disclosed in the present application.

[0032] Figure 5 The plan view of the immersed battery pack is disclosed in the present application.

[0033] Figure 6 The Figure 5 The plane section view at A-A in the middle.

[0034] Reference signs:

[0035] 1, box; 11, liquid inlet interface; 12, liquid outlet interface; 13, containing groove; 14, cavity; 2, battery module; 21, end plate; 22, single battery cell; 23, binding belt; 24, cooling fin; 241, heat conduction fin; 242, liquid passage groove; 3, liquid inlet assembly; 31, main pipeline; 32, branch pipeline; 321, liquid outlet; 33, liquid distribution pipe; 4, liquid outlet pipe; 41, liquid inlet; 5, BMS management unit. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0037] As shown in the drawings, Figure 1 Figures 2-6 ​The utility model discloses an immersed battery pack, including box 1, battery module 2 and liquid inlet component 3.

[0038] Wherein, box 1, as the shell of battery pack, is used for accommodating battery module 2 and cooling liquid, and the same end of the length direction of box 1 is respectively provided with liquid inlet interface 11 and liquid outlet interface 12, and the liquid outlet interface 12 is located above the liquid inlet interface 11.This structure setting shows that the cooling liquid will flow into from the bottom of box 1 and flow out through the liquid outlet interface 12 above.This design can make the flow of cooling liquid in the battery pack inside in the natural convection mode, after flowing from below, gradually taking away the heat in the battery pack and flowing to the upper side, and finally discharging through the liquid outlet interface 12.

[0039] Battery module 2 is arranged in the inside of box 1, and battery module 2 is cooled by being immersed in the cooling liquid.

[0040] Liquid inlet component 3 includes main pipeline 31 and branch pipeline 32 arranged on the bottom surface of box 1, the main pipeline 31 is horizontally located at one end of box 1 close to liquid inlet interface 11, the liquid inlet interface 11 is communicated with the main pipeline 31, the branch pipeline 32 is provided with a plurality of strips along the width direction of box 1, one end of the plurality of branch pipelines 32 is connected with the main pipeline 31 respectively, and the other end extends to one end of box 1 away from the liquid inlet interface 11 along the length direction of box 1, the end of the branch pipeline 32 away from the main pipeline 31 has a liquid outlet 321, and the design of the branch pipeline 32 ensures that the cooling liquid can cover the width of the entire battery pack and flow to each area of the battery pack, further ensuring the uniformity and effectiveness of the cooling liquid flow.

[0041] Adopting the above technical scheme, the cooling liquid is distributed to the plurality of branch pipelines 32 through the main pipeline 31, and the cooling liquid flows in the branch pipeline 32 from the bottom surface to the other end away from the liquid inlet 41, once the cooling liquid flows to the distal end of box 1, it starts to flow back, and the cooling liquid can take away the heat generated in the inside of battery module 2 in the process of flowing back, because the cooling liquid flows through the entire box 1, it contacts each surface of battery module 2, so that not only the single battery can be effectively cooled, but also the heat can be taken away and the uniformity of temperature distribution is ensured.When the cooling liquid flows back from the distal end, it continuously exchanges heat with battery module 2.Due to the uniformity of the cooling liquid flow, it can balance the cooling of each part of the battery pack, and prevent the situation that the heat dissipation effect is uneven due to the local temperature being too high.The flow of the entire cooling liquid forms a circulation system, so that each battery monomer in the battery pack can be fully and uniformly cooled.

[0042] As the coolant flows back from the far end of the housing 1, it carries away the heat generated by the battery pack. Because the heat exchange between the coolant and the battery pack is continuous, the uniformity of the coolant flow ensures that the heat is carried away at a consistent rate, preventing localized overheating and resulting in a more uniform temperature across the entire battery pack. This uniform flow of the coolant, which is not merely unidirectional, carries away the heat generated in every area of ​​the battery module 2. Furthermore, as the flow continues, the coolant naturally carries the warmer portions towards the outlet 321, while replenishing the cooler portions with more coolant, maintaining a uniform temperature distribution within the housing 1.

[0043] Because the coolant flows from bottom to top within the housing 1, this natural thermal convection makes it easier for the coolant to carry away heat. More heat accumulates at the top of the battery module 2, and the coolant flow direction automatically guides the coolant to the warmer areas, carrying away heat and promoting temperature balance.

[0044] In this embodiment, the coolant is a cooling medium made of insulating material, such as silicone oil.

[0045] To enable the installation of branch pipe 32 on the bottom surface inside housing 1, refer to the attached diagram. Figure 3 As shown, in this embodiment, multiple receiving slots 13 are provided along the length of the bottom surface inside the housing 1, and the branch pipe 32 is horizontally fixed in the receiving slots 13. The receiving slots 13 provide a fixed position for the branch pipe 32, preventing the branch pipe 32 from moving or deforming on the bottom surface inside the housing 1.

[0046] Furthermore, the branch pipe 32 is concealed within the receiving slot 13, eliminating the need for complex flow baffles and reducing the space occupied within the casing, thus contributing to increased energy density of the battery pack. Due to the compact pipe design, the cooling system is highly efficient and occupies little space, allowing the battery pack to accommodate more individual cells, thereby improving overall energy density.

[0047] In this embodiment, the depth of the receiving tank 13 is greater than the height from the top surface of the branch pipe 32 to the top surface of the receiving tank 13. This design allows the coolant to flow within the receiving tank 13 after being filled into the housing 1. During this process, the coolant dissipates heat from the bottom surface of the battery module 2, ensuring good cooling of the bottom surface during heat exchange and preventing excessively high temperatures, thus avoiding uneven battery temperature.

[0048] In some embodiments, the branch pipe 32 is a round pipe or a square pipe. Preferably, the branch pipe 32 is a square pipe. In the actual installation process, the branch pipe 32 can be bonded and fixed to the bottom surface of the receiving groove 13 with thermally conductive adhesive.

[0049] As the branch pipes 32 are located in the containing grooves 13 which are formed by the inner bottom of the box 1, and the main pipes 31 are located on the inner bottom of the box 1, in order to effectively connect the main pipes 31 and the branch pipes 32, the liquid inlet assembly 3 of the embodiment further comprises distribution pipes 33, and the main pipes 31 are connected with the branch pipes 32 in the containing grooves 13 through the distribution pipes 33. Specifically, the distribution pipes 33 are vertically located in the containing grooves 13, the lower ends of the distribution pipes 33 are connected with the branch pipes 32 perpendicularly, and the upper ends of the distribution pipes 33 are connected with the main pipes 31 perpendicularly.

[0050] As some preferable embodiments, the chambers 14 are arranged between the battery modules 2 and the front side walls of the box 1, and the main pipes 31 are located on the inner bottom of the chambers 14. By arranging the chambers 14, on the one hand, the main pipes 31 can be conveniently installed on the inner bottom of the box 1 through the chambers 14, and on the other hand, the space provided by the chambers 14 facilitates the connection between the battery modules 2 through the copper bars, and the chambers 14 provide installation bases for these structural connecting members.

[0051] More specifically, the BMS management units 5 are arranged in the chambers 14 and correspondingly on the outer side of the box 1.

[0052] In the embodiment, a plurality of battery modules 2 are arranged, and the plurality of battery modules 2 are arranged side by side in the width direction of the box 1, and gaps are left between the battery modules 2. In this way, the cooling liquid can flow along the gaps in the box 1, so as to cool and dissipate heat for the adjacent two battery modules 2.

[0053] Referring to FIG. 1, Figure 4 As shown in FIG. 1, the battery module 2 comprises two end plates 21 and a plurality of single battery cells 22, and the plurality of single battery cells 22 are arranged between the two end plates 21 in the length direction of the box 1, and the outer side of the end plates 21 and the plurality of single battery cells 22 is surrounded by a binding belt 23. Through the arrangement of the end plates 21 and the binding belt 23, the plurality of single battery cells 22 can be arranged together to form a battery module 2 with stable structure.

[0054] Since the monomer battery cell 22 is in contact with the large face of the monomer battery cell 22, the cooling liquid cannot dissipate heat from the large face of the monomer battery cell 22, which can cause the temperature of the battery module 2 to rise. Therefore, the embodiment is provided with the heat sink 24 between the monomer battery cells 22. The heat sink 24 extends out of the monomer battery cell 22 at both ends to form the heat conduction sheet 241, which is attached to the side wall of the battery module 2. The heat sink 24 of the embodiment is made of heat-conducting and insulating material. The heat conduction sheet 241 is located at both sides of the battery module 2 in the width direction. The heat of the large face of the monomer battery cell 22 is transferred to the heat sink 24, and then to the heat conduction sheet 241. The heat conduction sheet 241 is in contact with the cooling liquid. The cooling liquid absorbs the heat of the heat conduction sheet 241, thereby releasing the heat of the monomer battery cell 22 to the cooling liquid in time through the heat conduction sheet 241. The flowing cooling liquid carries away the heat, thereby realizing liquid cooling of the large face, side face, bottom face and top face of the monomer battery cell 22, and greatly improving the heat dissipation efficiency.

[0055] As some preferred embodiments, the heat sink 24 is provided with a plurality of liquid passing grooves 242 at equal intervals along the height direction of the monomer battery cell 22. The liquid passing grooves 242 are horizontally arranged along the width direction of the monomer battery cell 22. With this structure, the cooling liquid can flow through the liquid passing grooves 242 when flowing inside the box body 1. The cooling liquid directly carries away the heat of the monomer battery cell 22 on the heat sink 24 in time, thereby greatly improving the heat dissipation efficiency of the monomer battery cell 22.

[0056] In the embodiment, the chamber 14 is further provided with the liquid outlet pipe 4 fixedly connected with the side wall of the box body 1. The liquid outlet pipe 4 is parallel to the main pipeline 31. A plurality of liquid inlets 41 are arranged at intervals on the liquid outlet pipe 4. The liquid outlet pipe 4 is in communication with the liquid outlet port 12. With this arrangement, the cooling liquid flows back from the end far from the liquid inlet port 11 to the liquid outlet port 12 in the box body 1. The heat released by the battery module 2 is carried away in time during the flowing process. The cooled cooling liquid enters the plurality of liquid inlets 41 in the cooling liquid area on the top face of the battery module 2, and is discharged from the liquid outlet port 12, thereby realizing the circulation of the cooling liquid.

[0057] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An immersion battery pack, characterized by, The utility model relates to a battery module cooling device, including: Box (1), the same end side wall of length direction respectively is provided with liquid inlet interface (11) and liquid outlet interface (12), and the liquid outlet interface (12) is located the upper of liquid inlet interface (11): Battery module (2) is arranged in the inside of box (1): Liquid inlet subassembly (3), the liquid inlet subassembly (3) includes the main pipeline (31) and branch pipeline (32) of setting in the bottom surface of box (1), the main pipeline (31) is horizontally located in the one end of box (1) near liquid inlet interface (11), and liquid inlet interface (11) is communicated with main pipeline (31), and branch pipeline (32) is equally spaced and is provided with multiple along the width direction of box (1), and the one end of multiple branch pipeline (32) is connected with main pipeline (31) respectively, and the other end extends to the one end of box (1) away from liquid inlet interface (11) along the length direction of box (1), and the one end of branch pipeline (32) away from main pipeline (31) has liquid outlet (321).

2. The submerged battery pack of claim 1, wherein: The bottom surface of box (1) is provided with multiple accommodating grooves (13) along its length direction, and branch pipeline (32) is horizontally fixed in accommodating groove (13).

3. The submerged battery pack of claim 2, wherein: The depth of accommodating groove (13) is greater than the height from the top surface of branch pipeline (32) to the top surface of accommodating groove (13).

4. The submerged battery pack of claim 2, wherein: The branch pipeline (32) is a round pipe or a square pipe.

5. The submerged battery pack of any one of claims 2 to 4, wherein: The liquid inlet subassembly (3) further includes a distribution pipe (33), and the main pipeline (31) is connected through the branch pipeline (32) in the accommodating groove (13) of the distribution pipe (33).

6. The submerged battery pack of claim 5, wherein: The battery module (2) and the front side wall of the box (1) are provided with a cavity (14), and the main pipeline (31) is located at the bottom of the cavity (14).

7. The submerged battery pack of claim 6, wherein: The battery module (2) is provided with multiple battery modules (2), and the multiple battery modules (2) are arranged side by side in the width direction inside the box (1), the battery module (2) includes two end plates (21) and multiple single battery cells (22), the multiple single battery cells (22) are arranged between the two end plates (21) in the length direction of the box (1), the end plates (21) and the multiple single battery cells (22) are surrounded by a binding belt (23), the single battery cells (22) are provided with heat dissipation fins (24), the heat dissipation fins (24) extend out of the single battery cells (22) on both sides to form heat conduction fins (241), and the heat conduction fins (241) are attached to the side wall of the battery module (2).

8. The submerged battery pack of claim 7, wherein: The heat dissipation fins (24) are provided with multiple liquid passage grooves (242) equally spaced in the height direction of the single battery cells (22), and the liquid passage grooves (242) are horizontally arranged in the width direction of the single battery cells (22).

9. The submerged battery pack of claim 6, wherein: The cavity (14) is further provided with a liquid outlet pipe (4) fixedly connected to the side wall of the box (1), the liquid outlet pipe (4) is parallel to the main pipeline (31), multiple liquid inlets (41) are arranged on the liquid outlet pipe (4), and the liquid outlet pipe (4) is communicated with the liquid outlet interface (12).

10. The submerged battery pack of claim 6, wherein: The cavity (14) and the corresponding outside of the box (1) are provided with a BMS management unit (5).

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