Immersion liquid-cooled battery pack

Abstract

Disclosed in the present application is an immersion liquid-cooled battery pack, comprising a plurality of battery cells and a box body; the box body is provided with a liquid inlet, a liquid cooling mounting cavity and a liquid outlet which are successively connected to each other, and is configured for a cooling liquid to cyclically flow; the plurality of battery cells are arranged in the liquid cooling mounting cavity and immersed in the cooling liquid; the plurality of battery cells are arranged to form a liquid cooling channel, the liquid inlet being located at a first end of the liquid cooling channel, and the liquid outlet being located at a second end of the liquid cooling channel; part of the liquid cooling channel is located between the plurality of battery cells, and part of the liquid cooling channel is located on the outer sides of the plurality of battery cells.

Description

Immersed liquid-cooled battery pack

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on January 18, 2024, with application number 202420128175X. The entire contents of the above application are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of battery packs, and in particular to an immersion liquid-cooled battery pack. Background Art

[0003] The shift in energy from fossil fuels to new energy sources has driven the rapid development of the electric vehicle and energy storage industries. Lithium batteries are a common energy storage option for electric vehicles. However, their charge and discharge efficiency, capacity, safety, and lifespan are significantly affected by temperature. Excessive temperatures, or large temperature differences between battery packs, can directly impact battery performance, leading to premature failure and even fires, explosions, and other accidents. Battery packs used in related technologies lack effective heat dissipation and cannot guarantee consistent temperature differences between cells. SUMMARY OF THE INVENTION

[0004] The present application provides an immersion liquid-cooled battery pack to solve the above-mentioned technical problems.

[0005] The present application provides an immersion liquid-cooled battery pack, comprising a box body and a plurality of battery cells. The box body is provided with a liquid inlet, a liquid-cooling installation cavity and a liquid outlet which are connected in sequence, and is configured to circulate cooling liquid. The plurality of battery cells are arranged in the liquid-cooling installation cavity and immersed in the cooling liquid. The plurality of battery cells are arranged to form a liquid-cooling channel, the liquid inlet is located at a first end of the liquid-cooling channel, the liquid outlet is located at a second end of the liquid-cooling channel, part of the liquid-cooling channel is located between the plurality of battery cells, and part of the liquid-cooling channel is located outside the plurality of battery cells. Beneficial effects

[0006] The beneficial effects of the present application are as follows: the present application arranges multiple battery cells in a liquid-cooled installation cavity in the box body, so that the multiple battery cells are completely immersed in the coolant. The coolant can flow in from the first end where the liquid inlet is located, pass through the multiple battery cells and the outside of the multiple battery cells in turn, and then flow out from the second end where the liquid outlet is located, so that the coolant can achieve better heat dissipation around the battery cells, thereby ensuring that the temperature difference around each battery cell of the battery pack is more consistent during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] FIG1 is a schematic structural diagram of an immersion liquid-cooled battery pack provided in an embodiment of the present application;

[0008] FIG2 is a cross-sectional schematic diagram of an immersion liquid-cooled battery pack provided in an embodiment of the present application;

[0009] FIG3 is another cross-sectional schematic diagram of an immersion liquid-cooled battery pack provided in an embodiment of the present application;

[0010] FIG4 is a schematic structural diagram of a box provided in an embodiment of the present application;

[0011] FIG5 is a schematic cross-sectional view of a box provided in an embodiment of the present application.

[0012] Description of reference numerals:

[0013] 1. Battery cell; 2. Casing; 21. Liquid inlet; 22. Liquid outlet; 23. Liquid cooling installation cavity; 231. Upper accommodating cavity; 232. First installation cavity section; 233. Second installation cavity section; 24. Fixed end plate; 25. Mounting hole; 26. Connecting terminal; 27. Positioning slot; 3. Battery management system module; 4. Cover plate; 5. Integrated busbar. Modes for Carrying Out the Invention

[0014] In the related art, liquid-cooled battery packs usually have a liquid cooling plate next to the battery cells. For high-power battery cells, the heat dissipation effect is slow and the temperature difference consistency around the battery cells is not high. The battery in the embodiment of the present application is a storage battery used in vehicles or other stable places, so there is no need to excessively consider vibration.

[0015] Referring to Figures 1, 2 and 3, Figure 1 is a structural schematic diagram of an immersion liquid-cooled battery pack provided in an embodiment of the present application, Figure 2 is a cross-sectional schematic diagram of an immersion liquid-cooled battery pack provided in an embodiment of the present application, and Figure 3 is another cross-sectional schematic diagram of an immersion liquid-cooled battery pack provided in an embodiment of the present application. The present application provides an immersion liquid-cooled battery pack, comprising a case 2 and a plurality of battery cells 1. The case 2 is provided with a liquid inlet 21, a liquid cooling installation cavity 23 and a liquid outlet 22 that are connected in sequence, and is configured to circulate coolant. The plurality of battery cells 1 are arranged in the liquid cooling installation cavity 23 and immersed in the coolant. The plurality of battery cells 1 are arranged to form a liquid cooling channel, the liquid inlet 21 is located at the first end of the liquid cooling channel, the liquid outlet 22 is located at the second end of the liquid cooling channel, part of the liquid cooling channel is located between the plurality of battery cells 1, and part of the liquid cooling channel is located outside the plurality of battery cells 1.

[0016] It can be understood that multiple battery cells 1 are located in the liquid-cooled installation cavity 23 inside the box body 2, and the coolant is located inside the box body 2 and completely immerses and covers each battery cell 1, thereby achieving heat dissipation around the battery cells 1 inside the box body 2. Compared with setting the battery module as a whole in the box body 2, it can achieve a better heat dissipation effect for multiple battery cells 1.

[0017] It can be understood that multiple battery cells 1 are arranged to form a liquid cooling channel, the liquid inlet 21 is located at the first end of the liquid cooling channel, the liquid outlet 22 is located at the second end of the liquid cooling channel, part of the liquid cooling channel is located between the multiple battery cells 1, and part of the liquid cooling channel is located outside the multiple battery cells 1, so that the coolant can flow in from the first end where the liquid inlet 21 is located, pass through the multiple battery cells 1 and the outside of the multiple battery cells 1 in turn, and then flow out from the second end where the liquid outlet 22 is located, thereby achieving temperature difference consistency throughout the battery pack and ensuring high heat dissipation effect inside the battery pack.

[0018] Beneficial effects of the embodiments of the present application: The embodiments of the present application arrange multiple battery cells 1 in the liquid-cooling installation cavity 23 in the box body 2, so that the multiple battery cells 1 are completely immersed in the coolant. The coolant can flow in from the first end where the liquid inlet 21 is located, pass through the multiple battery cells 1 and the outside of the multiple battery cells 1 in turn, and then flow out from the second end where the liquid outlet 22 is located, so that the coolant can achieve better heat dissipation around the battery cells 1, thereby ensuring that the temperature difference around each battery cell 1 during operation of the battery pack is more consistent.

[0019] 1 and 2 , in some embodiments of the present application, a plurality of battery cells 1 are arranged in an array to form at least two battery cell units, and the at least two battery cell units are sequentially spaced apart along a first direction, and the battery cell units include a plurality of battery cells 1 sequentially spaced apart along a second direction; a plurality of liquid inlets 21 are provided on the box body 2, and the plurality of liquid inlets 21 are respectively arranged on opposite sides of the liquid outlet 22 along the first direction, or;

[0020] The box body 2 is provided with a plurality of liquid outlets 22 , and the plurality of liquid outlets 22 are respectively arranged on two opposite sides of the liquid inlet 21 along the first direction.

[0021] It is understandable that gaps may be provided between adjacent battery cells 1 in at least two battery cell units, so that the temperature difference of each battery cell 1 is more consistent.

[0022] It is understandable that the small gap width between the battery cells 1 can make the overall structure more compact, while also reducing the volume of the coolant and lowering production costs.

[0023] It can be understood that the multiple battery cells 1 are divided into multiple battery cell units arrayed along the first direction, adjacent battery cell units, and multiple battery cell units arrange the battery cells 1 in a row and form outer channels located outside the multiple battery cell units and internal channels located between the multiple battery cell units, that is, the outer channels and the internal channels can enclose the outside and inside of the battery cell 1, so that the coolant can pass through the outer channels and the inner channels from the liquid inlet 21 to achieve a more uniform heat dissipation effect on the inside and outside of the battery cell 1, thereby improving the consistency of the temperature difference between the battery cells 1.

[0024] As shown in FIG3 , in some embodiments of the present application, the box body 2 has a bottom wall and multiple side walls, which enclose a liquid cooling installation cavity 23; the liquid outlet 22 and the liquid inlet 21 are located on the same side wall, the liquid outlet 22 is arranged in the middle area of ​​the side wall along the first direction, and the multiple liquid inlets 21 are respectively arranged on both side areas of the side wall along the first direction.

[0025] It can be understood that the liquid inlet 21 is located in the two side areas along the first direction on the side wall, and the liquid outlet 22 is located in the middle area along the first direction on the side wall, so that the coolant can enter the outside of the multiple battery cells from the liquid inlet 21, and then return and flow out from the middle of the multiple battery cells, thereby making the heat dissipation of the multiple battery cells more uniform.

[0026] or;

[0027] The liquid inlet 21 is disposed in a middle region of the side wall along the first direction, and the plurality of liquid outlets 22 are respectively disposed in two side regions of the side wall along the first direction.

[0028] It can be understood that the liquid inlet 21 is located in the middle area of ​​the side wall along the first direction, and the liquid outlet 22 is located in the two side areas of the side wall along the first direction, which can enable the coolant to flow in from the middle of the multiple battery cell units, and then return and flow out from the outside of the multiple battery cell units, thereby making the heat dissipation of the multiple battery cells 1 more uniform.

[0029] It should be understood that the heat dissipation effects of the above two methods are similar, and both can ensure good temperature consistency between battery cells.

[0030] Refer to Figure 4, which is a structural schematic diagram of the box provided in an embodiment of the present application. In some embodiments of the present application, fixed end plates 24 are provided on opposite sides of the box 2 along the second direction, and the fixed end plates 24 are configured to abut the battery cells 1 at both ends of the battery cell unit.

[0031] It can be understood that end plates are provided on the two opposite side walls of the box body 2 along the second direction, which can block the gap between the battery cell 1 and the inner wall of the box body 2, and play a role in supporting the battery cell 1, thereby preventing the battery cell 1 from being without support on all sides and being offset from the box body 2 itself, thereby blocking the normal flow of the coolant.

[0032] Furthermore, the hollow interior of the end portion can also play a role in stabilizing pressure.

[0033] As shown in Figure 1, in some embodiments of the present application, the box body 2 has a bottom wall and multiple side walls, which enclose a liquid cooling installation cavity 23; the liquid inlet 21 is located in an area on the side wall close to the bottom wall, and the liquid outlet 22 is located in an area on the side wall away from the bottom wall.

[0034] It can be understood that the liquid inlet 21 is located in the area on the side wall close to the bottom wall, and the liquid outlet 22 is located in the area on the side wall away from the bottom wall, which can enable the coolant to dissipate heat from the bottom of the battery cell 1 upward, avoiding heat accumulation in the middle part of the multiple battery cells 1, thereby making the heat dissipation effect around the multiple battery cells 1 better.

[0035] As shown in Figure 2, in some embodiments of the present application, the immersion liquid-cooled battery pack includes a battery management system module 3 and a cover plate 4. The cover plate 4 is covered on the top of the box body 2 and is spaced apart from the coolant. The battery management system module 3 is located in the gap area between the cover plate 4 and the coolant and is spaced apart from the coolant.

[0036] It can be understood that the battery management system module 3 is located between the cover plate 4 and the battery module, so that the battery management system module 3 does not need to be immersed in the coolant, which solves the sealing problem of the battery management system module 3 and shortens the length of the entire battery pack.

[0037] As shown in FIG. 4 , in some embodiments of the present application, a mounting hole 25 is provided on the side wall of the box body 2 , and the battery management system module 3 further includes a mounting bracket, which cooperates with the mounting hole 25 .

[0038] It can be understood that a mounting hole 25 is provided on the top side wall of the box body 2, and the battery management system module 3 also includes a mounting bracket. The mounting bracket cooperates with the mounting hole 25, so that the battery management system module 3 can be fixed to the cover plate 4, so that the battery management system module 3 does not need to come into contact with the coolant, thereby making the battery management system module 3 have better waterproof performance and improving its own life.

[0039] As shown in Figure 2, in some embodiments of the present application, the cover plate 4 and the box body 2 enclose a liquid-cooling installation cavity 23 and an upper accommodating cavity 231. The upper accommodating cavity 231 is located above the liquid-cooling installation cavity 23 and is connected to the liquid-cooling installation cavity 23. The liquid level of the coolant is lower than the lower end opening of the upper accommodating cavity 231, and the battery management system module 3 is arranged in the upper accommodating cavity 231.

[0040] It can be understood that the cover plate 4 and the box body 2 enclose a liquid cooling installation cavity 23 and an upper accommodating cavity 231 configured to accommodate the battery management system module 3, thereby preventing the battery management system module 3 from being immersed in the coolant. The position where the cover plate 4 is not provided with the liquid cooling installation cavity 23 is flush with the top surface of the battery cell 1, and the surface of the coolant is flush with the top surface of the liquid cooling installation cavity 23, thereby preventing the coolant surface from vibrating.

[0041] Refer to Figure 5, which is a cross-sectional schematic diagram of the box provided in an embodiment of the present application. In some embodiments of the present application, the liquid-cooled installation cavity 23 has a first installation cavity section 232 and a second installation cavity section 233 arranged in sequence along the horizontal direction, and the upper accommodating cavity 231 is located above the first installation cavity section 232 and is staggered with the second installation cavity section 233; the immersion liquid-cooled battery pack also includes a connecting terminal 26, which is arranged on the side wall of the box 2 and is located in the upper accommodating cavity 231.

[0042] It is understandable that the second installation cavity section 233 of the cover plate 4 is flush with the top surface of the battery cell 1 , and the surface of the coolant is flush with the top surface of the second installation cavity section 233 , thereby preventing the coolant surface from vibrating.

[0043] 4 and 5 , in some embodiments of the present application, a plurality of positioning grooves 27 are provided on the inner bottom surface of the box body 2 , and the positioning grooves 27 are configured to position the battery cells 1 .

[0044] It can be understood that the bottom surface of the box body 2 is provided with positioning grooves 27 configured to position multiple battery cells 1. During the assembly of the battery cells 1, the battery cells 1 can be installed one by one inside the box body 2 to prevent them from shaking, and then the CCS components and battery management system modules 3 are installed on the top of the battery cells 1. In this way, after assembly, the battery cells 1 are relatively fixed and will not move around, and the liquid cooling channels will not be blocked.

[0045] In some embodiments of the present application, the immersed liquid-cooled battery pack also includes an electrically connected integrated busbar 5 and connecting terminals 26. Adjacent battery cells 1 are electrically connected through the integrated busbar 5. The integrated busbar 5 is at least partially immersed in the coolant. The connecting terminals 26 are arranged on the side wall of the box 2 and are located above the coolant.

[0046] It is understandable that the integrated busbar 5 is located on the bottom surface of the second end of the cover plate 4, that is, the integrated busbar 5 is immersed in the coolant along with the battery cell 1. Therefore, it should be noted that the integrated busbar 5 needs to have a waterproof effect.

Claims

1. An immersion liquid-cooled battery pack, comprising a plurality of battery cells (1) and a box body (2). The box body (2) is provided with a liquid inlet (21), a liquid outlet (22) and a liquid-cooling installation cavity (23) which are connected in sequence and are configured to circulate coolant. The plurality of battery cells (1) are arranged in the liquid-cooling installation cavity (23) and immersed in the coolant. The plurality of battery cells (1) are arranged to form a liquid-cooling channel. The liquid inlet (21) is located at the first end of the liquid-cooling channel, and the liquid outlet (22) is located at the second end of the liquid-cooling channel. Part of the liquid-cooling channel is located between the plurality of battery cells (1), and part of the liquid-cooling channel is located outside the plurality of battery cells (1).

2. The immersion liquid-cooled battery pack according to claim 1, wherein, The plurality of battery cells (1) are arranged in an array to form at least two battery cell units, and the at least two battery cell units are arranged at intervals in sequence along a first direction. Each battery cell unit includes a plurality of battery cells (1) arranged at intervals in sequence along a second direction. The box body (2) is provided with a plurality of the liquid inlets (21), and the plurality of liquid inlets (21) are respectively arranged on opposite sides of the liquid outlet (22) along the first direction, or; The box body (2) is provided with a plurality of the liquid outlets (22), and the plurality of liquid outlets (22) are respectively arranged on opposite sides of the liquid inlet (21) along the first direction.

3. The immersion liquid-cooled battery pack according to claim 2, wherein, The box body (2) has a bottom wall and a plurality of side walls, and the bottom wall and the plurality of side walls enclose to form the liquid-cooling installation cavity. The liquid outlet (22) and the liquid inlet (21) are located on the same side wall. The liquid outlet (22) is arranged in a middle area of this side wall along the first direction, and the plurality of liquid inlets (21) are respectively arranged in two side areas of this side wall along the first direction, or; The liquid inlet (21) is arranged in a middle area of this side wall along the first direction, and the plurality of liquid outlets (22) are respectively arranged in two side areas of this side wall along the first direction.

4. The immersion liquid-cooled battery pack according to claim 2, wherein, Fixing end plates (24) are provided on opposite sides of the box body (2) along the second direction, and the fixing end plates (24) are configured to abut against the battery cells (1) located at both ends in the battery cell unit.

5. The immersion liquid-cooled battery pack according to claim 1, wherein, The box body (2) has a bottom wall and a plurality of side walls, and the bottom wall and the plurality of side walls enclose to form the liquid-cooling installation cavity (23). The liquid inlet (21) is located in an area of the side wall close to the bottom wall, and the liquid outlet (22) is located in an area of the side wall far from the bottom wall.

6. The immersion liquid-cooled battery pack according to claim 1, wherein, The immersion liquid-cooled battery pack includes a battery management system module (3) and a cover plate (4). The cover plate (4) is covered on the top of the box body (2) and is spaced from the coolant. The battery management system module (3) is located in the gap area between the cover plate (4) and the coolant and is spaced from the coolant.

7. The immersion liquid-cooled battery pack according to claim 6, wherein, An installation hole (25) is provided on the side wall of the box body (2), and the battery management system module (3) further includes an installation bracket, and the installation bracket is matched with the installation hole (25).

8. The immersion liquid-cooled battery pack according to claim 6, wherein, The cover plate (4) and the box body (2) enclose the liquid cooling installation cavity (23) and the upper accommodating cavity (231); the upper accommodating cavity (231) is located above the liquid cooling installation cavity (23) and is in communication with the liquid cooling installation cavity (231); the liquid level of the cooling liquid is lower than the lower end opening of the upper accommodating cavity (231); and the battery management system module (3) is arranged in the upper accommodating cavity (231).

9. The immersion liquid-cooled battery pack according to claim 8, wherein, The liquid-cooling installation cavity (23) comprises a first installation cavity section (232) and a second installation cavity section (233) which are arranged in sequence along a horizontal direction; the upper accommodating cavity (231) is located above the first installation cavity section (232) and is arranged alternately with the second installation cavity section (233); the immersion liquid-cooling battery pack further comprises a connecting terminal (26), the connecting terminal (26) being arranged on a side wall of the box body (2) and being located in the upper accommodating cavity (231).

10. The immersion liquid-cooled battery pack according to claim 1, wherein, The inner bottom surface of the box body (2) is provided with a plurality of positioning grooves (27), and the positioning grooves (27) are configured to position the battery core (1).

11. The immersion liquid-cooled battery pack according to claim 1, wherein, The immersed liquid-cooled battery pack further comprises an electrically connected integrated busbar (5) and a connecting terminal (26), adjacent battery cells (1) are electrically connected via the integrated busbar (5), the integrated busbar (5) is at least partially immersed in the coolant, and the connecting terminal (26) is arranged on a side wall of the box body (2) and is located above the coolant.

Images