Housing, cell liquid-cooling case, and battery pack

Abstract

The present application provides a housing, a cell liquid-cooling case, and a battery pack. The housing comprises: a housing body having a first end plate and a second end plate, wherein a liquid inlet and a liquid outlet are formed in the first end plate; and a partition plate arranged in the housing body to divide the interior of the housing body into a plurality of cell mounting cavities, wherein a first flow channel having one end communicated with the liquid inlet is provided inside the partition plate, the other end of the first flow channel extends towards the second end plate and is provided with first flow outlets, and the first flow outlets are communicated with the plurality of cell mounting cavities and the liquid outlet.

Description

Box, cell liquid cooling box and battery pack

[0001] This application claims priority to Chinese patent applications filed with the China Patent Office on March 31, 2024, with application numbers 202420650071.5 and 202420649430.5, respectively. The entire contents of the above applications are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of battery technology, and in particular to a box, a cell liquid cooling box and a battery pack. Background Art

[0003] In the battery field, traditional heat dissipation methods generally include natural cooling, air cooling, phase change cooling, or bottom liquid cooling plate cooling. None of the above heat dissipation methods can solve the rapid temperature rise caused by high-power discharge of battery cells inside the battery pack, and it is difficult to ensure the balance of temperature differences between battery cells. SUMMARY OF THE INVENTION

[0004] Traditional heat dissipation methods are ineffective in dissipating the rapid temperature rise caused by high-power discharge of the battery cells inside the battery pack, affecting the balance of temperature differences between the battery cells.

[0005] In a first aspect, the present application provides a box, comprising:

[0006] The box body has a first end plate and a second end plate arranged opposite to each other, and the first end plate is provided with a liquid inlet and a liquid outlet;

[0007] A partition is arranged in the box body, and both ends of the partition are respectively connected to the first end plate and the second end plate, and divides the interior of the box body into multiple battery cell installation cavities. A first flow channel is provided inside the partition, and one end of the first flow channel is connected to the liquid inlet. The other end of the first flow channel extends toward the second end plate and is provided with multiple first flow outlets. The multiple first flow outlets are all connected to the multiple battery cell installation cavities, and the multiple battery cell installation cavities are also connected to the liquid outlet.

[0008] In a second aspect, the present application further provides a battery cell liquid cooling box, which comprises the box body and box cover described in the first aspect, and the box cover covers the box body.

[0009] In a third aspect, the present application further provides a battery pack, comprising the battery cell liquid cooling box described in the second aspect and a plurality of battery cells, wherein the plurality of battery cells are installed in the battery cell installation cavity. Beneficial effects

[0010] The box body provided by the present application has a liquid inlet and a liquid outlet both arranged on the first end plate of the box body, a partition is arranged in the box body to divide the interior of the box body into multiple battery cell installation cavities, a first flow channel is arranged in the partition, and multiple first flow outlets are arranged at the end of the first flow channel away from the first end plate, and the multiple first flow outlets are all connected to the multiple battery cell installation cavities, so that after the cooling medium enters through the liquid inlet, it flows through the first flow channel inside the partition to the second end plate opposite to the first end plate where the liquid inlet is located, and flows into the battery cell installation cavity through the first flow outlet, and then gradually flows back to the first end plate and flows out through the liquid outlet located on the first end plate, thereby making the cooling medium The cooling medium has a long circulation path. The cooling medium will dissipate heat to the battery cells in the process of flowing from the first end plate to the second end plate, and will dissipate heat to the battery cells again in the process of flowing from the second end plate to the first end plate, which helps to improve the cooling effect. In addition, such a structural setting allows the cooling medium to pre-cool the area inside the box that is not easy to dissipate heat (that is, the central area inside the battery pack), and then cool the remaining areas of the box. In this way, the cooling medium evenly covers each area where the battery cells are located, reducing the difference in heat dissipation capacity caused by uneven flow of the cooling medium, improving the temperature difference balance of multiple areas of the battery cells in the battery pack, and maintaining stable operation of the battery cells in the box.

[0011] The battery cell liquid cooling box provided by the present application has a liquid inlet and a liquid outlet both arranged on the first end plate of the box body, a partition is arranged in the box body to divide the interior of the box body into multiple battery cell installation cavities, a first flow channel is arranged in the partition, and multiple first flow outlets are arranged at the end of the first flow channel away from the first end plate, and the multiple first flow outlets are all connected with the multiple battery cell installation cavities, so that after the cooling medium enters through the liquid inlet, it flows through the first flow channel inside the partition to the second end plate opposite to the first end plate where the liquid inlet is located, and flows into the battery cell installation cavity through the first flow outlet, and then gradually flows back to the first end plate and flows out through the liquid outlet located on the first end plate, thereby making it possible to The cooling medium has a longer circulation path. The cooling medium will dissipate heat to the battery cells in the process of flowing from the first end plate to the second end plate, and will dissipate heat to the battery cells again in the process of flowing from the second end plate to the first end plate, which helps to improve the cooling effect. In addition, such a structural setting allows the cooling medium to pre-cool the area inside the box that is not easy to dissipate heat (i.e., the central area inside the battery pack), and then cool the remaining areas of the box. In this way, the cooling medium evenly covers each area where the battery cells are located, reducing the difference in heat dissipation capacity caused by uneven flow of the cooling medium, improving the temperature difference balance of multiple areas of the battery cells in the battery pack, and maintaining stable operation of the battery cells in the box.

[0012] The battery pack provided in the present application adopts the above-mentioned box body and box cover, so that the cooling medium evenly covers each area where the battery cell is located, reducing the difference in heat dissipation capacity caused by uneven flow of the cooling medium, improving the temperature difference balance of multiple areas of the battery cell in the battery pack, and maintaining the stable operation of the battery cell in the box; and the structural setting of the box cover can effectively prevent the electrolyte and exhaust gas sprayed from the battery cell immersed in the cooling medium during operation from contacting the cooling medium, avoiding the reduction of the insulation of the cooling medium and causing the battery pack to explode, thereby improving the safety of the battery pack and providing a strong guarantee for the long-term stable operation of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] FIG1 is a schematic structural diagram of a battery cell liquid cooling box provided in an embodiment of the present application;

[0014] FIG2 is an exploded schematic diagram of a battery cell liquid cooling box provided in an embodiment of the present application;

[0015] FIG3 is a schematic diagram of the cross-sectional structure of the battery cell liquid cooling box along line AA in FIG2 ;

[0016] FIG4 is a schematic structural diagram of a box cover in a battery cell liquid cooling box provided in an embodiment of the present application;

[0017] FIG5 is a cross-sectional schematic diagram of a box cover in a battery cell liquid cooling box provided in an embodiment of the present application;

[0018] FIG6 is another cross-sectional schematic diagram of the box cover in the battery cell liquid cooling box provided in an embodiment of the present application;

[0019] FIG7 is a schematic structural diagram of a battery pack provided in an embodiment of the present application;

[0020] FIG8 is a schematic diagram of an explosion of a battery pack provided in an embodiment of the present application;

[0021] FIG9 is a schematic cross-sectional view of a battery pack provided in an embodiment of the present application;

[0022] FIG10 is another cross-sectional schematic diagram of the battery pack provided in an embodiment of the present application;

[0023] FIG11 is another cross-sectional schematic diagram of the battery pack provided in an embodiment of the present application.

[0024] Description of reference numerals:

[0025] 1. Box body; 11. Liquid inlet; 12. Liquid outlet; 13. Box cover; 14. Second flow channel; 15. Third flow channel; 16. First end plate; 17. Second end plate; 18. First side plate; 19. Second side plate; 20. Bottom plate; 2. Partition; 21. First flow channel; 22. First flow outlet; 23. Fourth flow channel; 24. Second flow outlet; 3. Battery cell mounting cavity; 4. Abutment plate; 5. Battery unit; 51. Battery cell; 511. Explosion-proof valve; 52. Fifth flow channel; 6. Mounting shell; 61. First accommodating cavity; 62. Second accommodating cavity; 63. Third accommodating cavity; 7. Shell cover; 8. Cover body; 81. Discharge flow channel; 82. Protrusion; 83. Mounting hole; 84. Screw hole; 85. Extension; 9. Pressure relief valve; 10. Discharge outlet. Modes for Carrying Out the Invention

[0026] In the description of this application, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0027] In this application, 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 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 includes the first feature being directly above and obliquely above the second feature, with the first feature having a higher horizontal height than the second feature. A first feature being "below," "below," and "below" a second feature includes the first feature being directly below and obliquely below the second feature, with the first feature having a lower horizontal height than the second feature.

[0028] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings. They are intended to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used to distinguish between the two in the description and do not have any special meaning.

[0029] Referring to Figures 1 and 2, Figure 1 is a structural schematic diagram of the battery cell liquid cooling box provided in an embodiment of the present application, and Figure 2 is an explosion schematic diagram of the battery cell liquid cooling box provided in an embodiment of the present application. The embodiment of the present application provides a battery cell liquid cooling box, which includes a box body and a box cover 13, and the box cover 13 is covered on the box body.

[0030] FIG3 is a schematic cross-sectional view of the partition 2 of the box body in FIG2 along the AA cross section provided by an embodiment of the present application. The present application provides a box body, which includes:

[0031] The box body 1 has a first end plate 16 and a second end plate 17 arranged opposite to each other, and the first end plate 16 is provided with a liquid inlet 11 and a liquid outlet 12;

[0032] The partition 2 is arranged in the box body 1, and the two ends of the partition 2 are respectively connected to the first end plate 16 and the second end plate 17, and the interior of the box body 1 is divided into multiple battery cell installation cavities 3. A first flow channel 21 is provided inside the partition 2, and one end of the first flow channel 21 is connected to the liquid inlet 11. The other end of the first flow channel 21 extends toward the second end plate 17 and is provided with multiple first flow outlets 22. The multiple first flow outlets 22 are connected to the multiple battery cell installation cavities 3, and the multiple battery cell installation cavities 3 are also connected to the liquid outlet 12.

[0033] It can be understood that the interior of the box body 1 can be divided into two battery cell installation cavities 3 by the partition 2, and can also be divided into three, four or even more battery cell installation cavities 3.

[0034] It is understood that to facilitate the installation of the cooling medium circulation device, the liquid inlet 11 and the liquid outlet 12 are both provided on the first end plate 16. In the present application, by providing the liquid inlet 11 and the liquid outlet 12 on the first end plate 16, combined with the first flow channel 21 provided in the partition 2 and other structures, the cooling medium can have a longer circulation path, thereby helping to improve the temperature difference balance of each battery cell 51 in the box.

[0035] It is understandable that the number of the liquid inlet 11 and the liquid outlet 12 is not limited here, as long as the battery cell installation cavity 3 is connected to the liquid outlet 12.

[0036] It can be understood that after the battery cell 51 is installed in the box, the cooling medium is introduced from the liquid inlet 11 through the first flow channel 21 in the partition 2 from the end where the first end plate 16 of the box body 1 is located to the end where the second end plate 17 is located. During the introduction process, the area inside the box that is not easy to dissipate heat (i.e., the central area of ​​the box body 1) is pre-cooled, and then circulated from the second end plate 17 of the box body 1 toward the first end plate 16 with the liquid outlet 12 around the battery cell 51. In this way, the temperature difference balance of the area where multiple battery cells 51 are located in the box is improved.

[0037] The beneficial effects of the embodiment of the present application are as follows: by arranging the liquid inlet 11 and the liquid outlet 12 on the first end plate 16 of the box body, arranging a partition 2 in the box body to divide the interior of the box body 1 into a plurality of battery cell installation cavities 3, arranging a first flow channel 21 in the partition 2, and arranging a plurality of first flow outlets 22 at the end of the first flow channel 21 away from the first end plate 16, and the plurality of first flow outlets 22 are connected with the plurality of battery cell installation cavities 3, so that the cooling medium, after entering from the liquid inlet 11, flows through the first flow channel 21 inside the partition 2 to the second end plate 17 opposite to the first end plate 16 where the liquid inlet 11 is located, and flows into the battery cell installation cavity 3 through the first flow outlet 22, and then gradually flows back to the first end plate 16, and through the liquid outlet located on the first end plate 16 12 flows out, thereby allowing the cooling medium to have a longer circulation path. The cooling medium will dissipate heat to the battery cells 51 in the process of flowing from the first end plate 16 to the second end plate 17, and will dissipate heat to the battery cells 51 again in the process of flowing from the second end plate 17 to the first end plate 16, which helps to improve the cooling effect. In addition, such a structural arrangement allows the cooling medium to pre-cool the area inside the box that is not easy to dissipate heat (i.e., the central area inside the battery pack), and then cool the remaining areas of the box. As a result, the cooling medium evenly covers each area where the battery cells 51 are located, reducing the difference in heat dissipation capacity caused by uneven flow of the cooling medium, improving the temperature difference balance of multiple areas of the battery cells 51 in the battery pack, and maintaining the stable operation of the battery cells 51 in the box.

[0038] In some embodiments of the present application, the box body 1 also includes a first side panel 18 and a second side panel 19 that are arranged opposite to each other, and the opposite ends of the first side panel 18 and the second side panel 19 are respectively connected to the first end panel 16 and the second end panel 17, and a second flow channel 14 is provided on the inner side of the first side panel 18 and the second side panel 19, and the opposite ends of the second flow channel 14 are respectively connected to the first flow outlet 22 and the liquid outlet 12.

[0039] It is understood that foam can be filled between the battery cell 51 and the first and second side panels 18, 19 of the box to form the second flow channel 14. Using foam to form this structure can reduce the space between the battery cell 51 and the first or second side panels 18, 19, thereby reducing and saving the amount of cooling medium. Of course, it is also possible to directly groove the inner sides of the first and second side panels 18, 19 to form the second flow channel 14.

[0040] In the embodiment of the present application, a second flow channel 14 is provided on the inner side of the first side plate 18 and the second side plate 19, and the opposite ends of the second flow channel 14 are respectively connected to the first flow outlet 22 and the liquid outlet 12, so that the cooling medium flowing out of the first flow outlet 22 passes through the second flow channel 14 and flows back from the second end plate 17 to the first end plate 16, thereby providing good heat dissipation capacity for the side of the battery cell 51 close to the first side plate 18 and the second side plate 19.

[0041] The second flow channels 14 may include a plurality of channels, and the extending direction of the second flow channels 14 may be parallel to the length direction of the first side plate 18 and the second side plate 19 .

[0042] It should be noted that the flow channels (first flow channel 21, second flow channel 14 or third flow channel 15, etc.) in the embodiments of the present application can be straight flow channels, serpentine flow channels or special-shaped flow channels formed by a combination of the two, and the present application does not make specific limitations.

[0043] In some embodiments of the present application, the box body 1 also includes a bottom plate 20, the opposite ends of the bottom plate 20 are respectively connected to the first end plate 16 and the second end plate 17, and a third flow channel 15 is provided on the inner side of the bottom plate 20, and the opposite ends of the third flow channel 15 are respectively connected to the first flow outlet 22 and the liquid outlet 12.

[0044] It can be understood that a third flow channel 15 is provided on the inner side of the bottom plate 20, so that when the cooling medium flows in the third flow channel 15, the bottom end of the battery cell 51 can be dissipated, thereby improving the temperature difference balance around the multiple battery cells 51 in the battery pack, and further improving the performance and service life of the battery cell 51.

[0045] In some embodiments of the present application, a second flow outlet 24 is provided in the middle area of ​​the first flow channel 21 , and the second flow outlet 24 is communicated with the third flow channel 15 .

[0046] It is understood that since the side of the battery cell 51 near the first side plate 18 and the second side plate 19 can partially dissipate heat through air cooling, the central area and bottom area of ​​the box have lower heat dissipation capacity than the area near the side of the box. In this embodiment of the application, by providing a second flow outlet 24 in the middle area of ​​the first flow channel 21 and connecting the second flow outlet 24 to the third flow channel 15, the bottom surface of the battery cell 51 has better heat dissipation capacity, thereby improving the temperature difference balance among multiple battery cells 51.

[0047] In some embodiments of the present application, the flow area of ​​the second outlet 24 is smaller than the flow area of ​​the first outlet 22. Specifically, in this embodiment, the cross-sections of the second outlet 24 and the first outlet 22 are both circular, that is, the aperture of the first outlet 24 is smaller than that of the first outlet 22.

[0048] It is understandable that the flow ratio between the second outlet 24 and the first outlet 22 is set differently according to the specific heating conditions of the battery, and the ratio is not limited here.

[0049] In the embodiment of the present application, the aperture of the second flow outlet 24 is set to be smaller than the aperture of the first flow outlet 22, so that the flow rate of the second flow outlet 24 is smaller than the flow rate of the first flow outlet 22, thereby causing most of the cooling medium to be diverted to the first flow outlet 22 to dissipate heat to the battery cell 51 close to the second end plate 17, and causing a small portion of the cooling medium to be diverted to the second flow outlet 24 to dissipate heat to the bottom of the battery cell 51, thereby preventing most of the cooling medium from directly flowing back from the middle of the partition 2 to the first end plate 16. This helps to improve the temperature difference balance of multiple battery cells 51 in the battery pack.

[0050] In some embodiments of the present application, a fourth flow channel 23 is provided on the side of the partition 2 , and opposite ends of the fourth flow channel 23 are respectively connected to the first flow port 22 and the liquid outlet 12 .

[0051] It can be understood that the first flow channel 21 is located inside the partition 2, and the fourth flow channel 23 is located on the outer wall of the partition 2, that is, inside the battery cell installation cavity 3, and the positions of the two on the partition 2 are completely different.

[0052] It can be understood that a fourth flow channel 23 is provided on both side surfaces of the partition 2, so that a gap is formed between the battery cell 51 and the partition 2, which not only enables the cooling medium to pre-cool the central area of ​​the box that is not easy to dissipate heat when flowing through the first flow channel 21, but also enables the cooling medium to flow out from the first flow outlet 22 and then flow back to the first end plate 16 through the fourth flow channel 23, thereby achieving sufficient liquid cooling contact for the battery cell 51 located in the central area of ​​the box, and then achieving secondary cooling of the battery cell 51 located in the central area of ​​the box, thereby improving the temperature difference balance of multiple battery cells 51 in the box.

[0053] Likewise, the fourth flow channels 23 may include a plurality of channels, and the extending direction of the fourth flow channels 23 may be parallel to the extending direction of the partition 2 .

[0054] In some embodiments of the present application, the box body 1 also includes an abutment plate 4 arranged on the inner side of the first end plate 16 and the second end plate 17, and the abutment plate 4 is configured to be arranged between the first end plate 16 and the battery cell 5 of the battery pack, and / or between the second end plate 17 and the battery cell 5 of the battery pack.

[0055] In the embodiment of the present application, an abutment plate 4 is provided on the inner side of the first end plate 16 and the second end plate 17 to block the gap between the battery cell 51 and the inner wall of the box body 1, thereby supporting the battery cell 51. This prevents the battery cell 51 from being offset relative to the inner wall of the box body 1 due to the lack of support, thereby blocking the normal flow of the cooling medium. It is understood that a transverse flow channel can be provided on the abutment plate 4 to connect the first flow outlet 22 and the second flow channel 14; a longitudinal flow channel can also be provided to connect the first flow outlet 22 and the third flow channel 15. Of course, the transverse flow channel and the longitudinal flow channel here can also be formed by providing strip spacers between the abutment plate 4 and the battery cell 51 or between the abutment plate 4 and the end plate (the first end plate 16 and / or the second end plate 17).

[0056] Referring to Figures 4 to 6, Figure 4 is a structural schematic diagram of the box cover 13 in the battery cell liquid cooling box provided in an embodiment of the present application, Figure 5 is a cross-sectional schematic diagram of the box cover 13 in the battery cell liquid cooling box provided in an embodiment of the present application, and Figure 6 is another cross-sectional schematic diagram of the box cover 13 in the battery cell liquid cooling box provided in an embodiment of the present application.

[0057] In some embodiments of the present application, the box cover 13 includes a cover body 8, a pressure relief valve 9 is provided on one side of the cover body 8, a discharge port 10 is provided at the end of the cover body 8, and a discharge flow channel 81 is provided inside the cover body 8. One end of the discharge flow channel 81 is connected to the pressure relief valve 9, and the other end of the discharge flow channel 81 is connected to the discharge port 10.

[0058] It can be understood that the cover 8, as the main component of the box cover 13, plays the role of sealing and protecting the box body 1. The cover 8 has good sealing performance to prevent external impurities from entering the box body 1, and also has a certain structural strength to withstand multiple forces from inside and outside the box.

[0059] It is understandable that there may be multiple discharge ports 10 and discharge channels 81 , and there is no limitation on this.

[0060] It is understood that during operation, the battery cells 51 housed in the housing may experience internal pressure fluctuations due to chemical reactions or temperature changes. By providing a pressure relief valve 9 on one side of the cover 8, when the internal pressure of the battery cells 51 exceeds a set value, the explosion-proof valve 511 on the battery cells 51 and the pressure relief valve 9 on the cover 8 will open, releasing some gas and electrolyte, thereby maintaining stable pressure within the battery cells 51 and the housing. This prevents dangers caused by excessive internal pressure in the battery cells 51.

[0061] It will be appreciated that by providing a discharge port 10 at the end of the cover 8 and disposing a discharge channel 81 within the cover 8, with one end of the discharge channel 81 communicating with the pressure relief valve 9 and the other end communicating with the discharge port 10, a pressure relief channel is provided for the discharge of waste gas and electrolyte from the battery cell 51. When waste gas and electrolyte are ejected from the battery cell 51, the waste gas can pass through the pressure relief valve 9, the discharge channel 81, the discharge port 10, and ultimately be discharged into the external environment. This effectively prevents the waste gas and electrolyte from coming into contact with and mixing with the cooling medium in the case, thereby avoiding degradation of the cooling medium's insulation and potentially causing the battery pack to explode, thereby maintaining the normal operation of the battery pack and extending its service life.

[0062] The beneficial effects of the embodiments of the present application are as follows: by arranging a pressure relief valve 9 on the side of the cover body 8 and arranging a discharge channel 81 configured to safely discharge exhaust gas and electrolyte from the battery pack inside the cover body 8, the exhaust gas and electrolyte discharged from the battery cell explosion-proof valve 511 in the battery pack can be discharged through the pressure relief valve 9, the discharge channel 81 and the discharge port 10 on the cover body 8, which can effectively prevent the electrolyte and exhaust gas sprayed from the battery cell 51 immersed in the cooling medium during operation from contacting the cooling medium, avoiding the reduction of the insulation of the cooling medium and causing the battery pack to explode, thereby improving the safety of the battery pack and providing a strong guarantee for the long-term stable operation of the battery pack.

[0063] In some embodiments of the present application, the cover body 8 includes a main body and a raised portion 82 protruding from the main body. The pressure relief valve 9 is located on the surface of the raised portion 82 facing away from the main body. The discharge channel 81 extends to the raised portion 82 and passes through the raised portion 82 along the raised direction of the raised portion 82, and is connected to the pressure relief valve 9. The discharge channel 81 located in the raised portion 82 forms a first cavity.

[0064] By providing a protrusion 82 on one side of the main body of the cover 8, the pressure relief valve 9 is located on the surface of the protrusion 82 away from the main body, and the discharge channel 81 extends to the protrusion 82, passes through the protrusion 82 and is connected with the pressure relief valve 9, a first cavity is formed, which can provide a buffer space for releasing the internal pressure of the battery cell 51 when the battery cell 51 explodes at the explosion-proof valve 511, reduce the degree of deformation of the cover 8 due to high-pressure impact, and thus reduce the possibility of the cover 8 being ruptured due to impact.

[0065] In some embodiments of the present application, a second cavity is formed in the pressure relief valve 9 , and the volume of the second cavity is smaller than the volume of the first cavity.

[0066] A second cavity is formed in the pressure relief valve 9, and the volume of the second cavity is smaller than the volume of the first cavity, so that the exhaust gas and electrolyte entering from the pressure relief valve 9 can be properly buffered through the first cavity in the cover body 8, thereby reducing the degree of deformation of the cover body 8 due to high-pressure impact, thereby reducing the possibility of the cover body 8 being broken due to impact.

[0067] In some embodiments of the present application, the first cavity and the second cavity are both cylindrical, and the inner diameter of the second cavity is smaller than the inner diameter of the first cavity.

[0068] It can be understood that the ratio of the internal volumes of the first cavity and the second cavity can be determined by setting the ratio of the inner diameters of the first cavity and the second cavity, or the ratio of the internal volumes of the first cavity and the second cavity can be determined by setting the ratio of the heights of the first cavity and the second cavity, so as to achieve that the volume in the first cavity is greater than the volume in the second cavity, so that the exhaust gas and electrolyte entering from the pressure relief valve 9 can be properly buffered through the first cavity in the cover body 8, thereby reducing the degree of deformation of the cover body 8 due to high-pressure impact, thereby reducing the possibility of the cover body 8 being broken due to impact.

[0069] In some embodiments of the present application, the pressure relief valve 9 is provided with an elastic seal around the valve port, and the elastic seal is configured to abut against the outer periphery of the valve port of the explosion-proof valve 511 of the battery cell 51 .

[0070] It can be understood that the shape of the elastic seal includes but is not limited to a solid ring, a hollow ring, a ring with a rectangular cross-section, a ring with a circular cross-section, etc., and the material of the elastic seal includes but is not limited to rubber, silicone, etc.

[0071] It can be understood that the elastic seal, as an elastic material, can fit tightly to the periphery of the valve mouth of the explosion-proof valve 511 on the battery cell 51, thereby effectively preventing gas or liquid from leaking from the gap, and can significantly improve the sealing performance between the box cover 13 and the battery cell 51, avoiding gas leakage or electrolyte overflow during battery operation.

[0072] As will be appreciated, the elastic seal has a certain degree of elasticity and cushioning effect. When the cover 13 contacts the valve port of the pressure relief valve 9 on the battery cell 51, the elastic seal can absorb some of the impact force, reducing wear or damage caused by hard contact. This helps to extend the service life of the cover 13 and the battery cell 51, while also ensuring the stability of the battery system.

[0073] It can be understood that the softness and elasticity of the elastic seal make it easier to align and separate the box cover 13 with the valve port of the burst valve on the battery cell 51 during installation and disassembly, which can reduce the difficulty of operation, improve the efficiency of disassembly / assembly, and reduce the risk of damage caused by improper operation.

[0074] It is understood that the elastic seal has a certain adaptability to changes in temperature and pressure and can maintain stable sealing performance under different temperature environments. This allows the box cover 13 to maintain reliable performance in complex and changeable working environments.

[0075] In summary, it not only improves sealing performance and prevents gas and liquid leakage, but also provides buffering and protection, while also improving installation and removal convenience. This design helps ensure the safety and stability of the battery system and improves overall performance.

[0076] In some embodiments of the present application, a hole portion is provided on the cover body 8, wherein the hole portion includes a mounting hole 83 configured to allow fixing bolts on the internal bus of the battery pack to pass through.

[0077] It can be understood that the cover 8 can be made of a conductive material or an insulating material.

[0078] It can be understood that the mounting hole 83 can be a through hole or a blind hole.

[0079] It is understood that the diameter of the fixing bolt is smaller than the inner diameter of the mounting hole 83 so that the outer wall of the fixing bolt is separated from the inner wall of the mounting hole 83. It is understood that the top surface of the nut of the fixing bolt also needs to be separated from the bottom surface of the cover body 8.

[0080] The embodiment of the present application provides a mounting hole 83 on the cover body 8 and sets the diameter of the fixing bolt to be smaller than the inner diameter of the mounting hole 83, so that when the cover body 8 is made of a conductive material, the inner wall of the mounting hole 83 and the outer wall of the fixing bolt on the bus inside the battery pack are separated by a safe electrical distance, thereby avoiding the situation where the bus and the cover body 8 are electrically conductive, and improving the safe conductivity of the bus.

[0081] In some embodiments of the present application, the hole portion further includes a screw hole 84 on the edge of the cover 8 , and the screw hole 84 is configured to cooperate with a screw to securely connect the cover 8 to the box body 1 .

[0082] In the embodiment of the present application, screw holes 84 are provided on the cover 8 so that the cover 8 can be fixedly connected to the box body 1 by bolts after being installed, and the pressure relief valve 9 on the cover 8 and the explosion-proof valve 511 on the battery cell 51 are tightly combined.

[0083] In some embodiments of the present application, a protruding portion 85 is provided at the end of the cover body 8 , and the discharge flow channel 81 extends to the protruding portion 85 and passes through the protruding portion 85 .

[0084] It should be noted that the number of the extension portion 85 includes but is not limited to one.

[0085] In the embodiment of the present application, an extension portion 85 is provided at the end of the box cover 13 , and the exhaust channel 81 extends to the extension portion 85 and passes through the extension portion 85 , so that the exhaust gas and / or electrolyte in the exhaust channel 81 can be discharged out of the battery pack through the extension portion 85 .

[0086] Based on the same concept, refer to Figures 7 to 8, Figure 7 is a structural schematic diagram of the battery pack provided in an embodiment of the present application, and Figure 8 is an explosion schematic diagram of the battery pack provided in an embodiment of the present application. The present application also provides a battery pack, including the above-mentioned battery cell liquid cooling box and multiple battery cells 5, and the multiple battery cells 5 are installed in the battery cell installation cavity 3.

[0087] It can be understood that since the battery cell liquid cooling box in the embodiment of the present application has the effect of improving the poor temperature difference balance of the battery cells 51 in the box, the battery pack provided in the embodiment of the present application also has this effect, which will not be repeated here.

[0088] In some embodiments of the present application, referring to Figures 8 to 9, Figure 9 is a cross-sectional schematic diagram of a battery pack provided in an embodiment of the present application. The battery pack further includes a mounting shell 6 and a shell cover 7. The mounting shell 6 includes:

[0089] a first accommodating cavity 61 , wherein the box body is located in the first accommodating cavity 61 , and / or;

[0090] a second accommodating cavity 62 , the second accommodating cavity 62 being configured to accommodate a battery management system module, and / or;

[0091] A third accommodating chamber 63 is formed between the top of the box body and the shell cover 7 and is configured to accommodate the CCS assembly.

[0092] It can be understood that based on the need to make the product easy to form and improve assembly efficiency, the battery pack can also include an installation shell 6 and a shell cover 7. The partition 2 is located in the box body, and the outer wall of the box body fits with the inner wall of the installation shell 6, which facilitates the production and assembly of the box body and the installation shell 6.

[0093] It can be understood that the installation shell 6 includes a first accommodating cavity 61 configured to accommodate the box body, a second accommodating cavity 62 configured to accommodate the battery management system module, and a third accommodating cavity 63 formed between the top of the box body and the shell cover 7, so that the battery management system module and the CCS component are respectively separated from the cooling medium in the battery cell installation cavity 3, ensuring the stable operation of the CCS component and the battery management system module.

[0094] In some embodiments of the present application, the battery unit 5 includes a plurality of battery cells 51 , which are arranged in sequence and spaced apart, and a fifth flow channel 52 is defined between the battery cells 51 .

[0095] It can be understood that spacers may be provided between the battery cells 51 to form a fifth flow channel 52 , and the fifth flow channel 52 is located between adjacent battery cells 51 in the battery cell installation cavity 3 .

[0096] In the embodiment of the present application, a fifth flow channel 52 is provided between the battery cells 51 so that the cooling medium fully surrounds the circumference of each battery cell 51 , thereby achieving temperature difference balance for each battery cell 51 in the battery pack and reducing the thermal coupling effect between the battery cells 51 .

[0097] The fifth flow channels 52 may include a plurality of channels, and the extending direction of the fifth flow channels 52 may be parallel to the extending direction of the length direction of the battery cell 51 .

[0098] Referring to Figure 10, Figure 10 is another cross-sectional schematic diagram of the battery pack provided in an embodiment of the present application. The embodiment of the present application also includes a battery pack, which includes the above-mentioned battery cell liquid cooling box and battery cell 51, the battery cell 51 is installed in the battery cell immersion cavity, the box cover 13 covers the box body 1, the pressure relief valve 9 on the box cover 13 faces the explosion-proof valve 511 of the battery cell 51, the box cover 13 covers the battery cell immersion cavity and is fixed to the box body 1, and the pressure relief valve 9 of the box cover 13 is in interference fit with the explosion-proof valve 511 of the battery cell 51.

[0099] In the embodiment of the present application, the battery cell 51 is placed in the box body 1, and the box cover 13 is covered on the box body 1 and fixed to the box body 1. The pressure relief valve 9 on the box cover 13 is directly opposite the explosion-proof valve 511 of the battery cell 51 and is in interference fit with the explosion-proof valve 511, so that the exhaust gas and electrolyte released from the battery cell 51 can smoothly pass through the explosion-proof valve 511 of the battery cell 51 and be discharged from the battery cell immersion cavity through the pressure relief valve 9 and the discharge channel 81 in the box cover 13, thereby preventing the electrolyte and exhaust gas in the battery cell 51 from contacting the cooling medium and causing pollution to the cooling medium, thereby preventing the stable operation of the battery pack from being affected by the low insulation of the cooling medium.

[0100] Based on the same concept, refer to Figure 11, which is another cross-sectional schematic diagram of the battery pack provided in the embodiment of the present application. The embodiment of the present application also includes a battery pack, which includes the above-mentioned battery cell liquid cooling box, the above-mentioned installation shell 6 and the battery cell 51. The battery cell liquid cooling box is integrated with the installation shell 6. Specifically, a battery cell immersion chamber is formed in the installation shell 6, and the battery cell 51 is installed in the battery cell immersion chamber. The box cover 13 covers the battery cell immersion chamber, and the pressure relief valve 9 on the box cover 13 faces the explosion-proof valve 511 of the battery cell 51. The box cover 13 covers the battery cell immersion chamber and is fixed to the installation shell 6. The pressure relief valve 9 of the box cover 13 is in interference fit with the explosion-proof valve 511 of the battery cell 51.

[0101] It can be understood that the flow channel or liquid cooling plate on the box body in Figure 8 can be directly integrated into the interior of the mounting shell 6, and a CCS component connected to the bus on the battery cell 51 can be set above the box cover 13 fixedly connected to the mounting shell 6. A plurality of side panels and a bottom plate 20 can be set on the outside of the mounting shell 6 to form a placement cavity with a top opening, and the placement cavity can be configured to place a battery system management module connected to the CCS component.

[0102] In the embodiment of the present application, the battery cell 51 is placed in the battery cell immersion cavity of the mounting shell 6, and the pressure relief valve 9 on the box cover 13 is directly opposite to the explosion-proof valve 511 of the battery cell 51 and covers the battery cell immersion cavity, and is fixed to the mounting shell 6, so that the pressure relief valve 9 of the box cover 13 and the explosion-proof valve 511 of the battery cell 51 are in interference fit, so that the exhaust gas and electrolyte ejected from the battery cell 51 can smoothly pass through the explosion-proof valve 511 of the battery cell 51 and the pressure relief valve 9 and the discharge channel 81 in the box cover 13 to be discharged from the battery cell 51 immersion cavity, thereby preventing the electrolyte and exhaust gas in the battery cell 51 from contacting the cooling medium in the battery cell immersion cavity, causing pollution to the cooling medium, and preventing the stable operation of the battery pack from being affected by the low insulation of the cooling medium.

Claims

1. A box, comprising: The box body (1) has a first end plate (16) and a second end plate (17) arranged opposite to each other, and the first end plate (16) is provided with a liquid inlet (11) and a liquid outlet (12); A partition (2) is arranged in the box body (1), and the two ends of the partition (2) are respectively connected to the first end plate (16) and the second end plate (17), and the interior of the box body (1) is divided into a plurality of battery cell installation cavities (3). A first flow channel (21) is provided inside the partition (2), one end of the first flow channel (21) is connected to the liquid inlet (11), and the other end of the first flow channel (21) extends toward the second end plate (17) and is provided with a plurality of first flow outlets (22), the plurality of first flow outlets (22) are connected to the plurality of battery cell installation cavities (3), and the plurality of battery cell installation cavities (3) are also connected to the liquid outlet (12).

2. The box according to claim 1, wherein: The box body (1) further comprises a first side plate (18) and a second side plate (19) arranged opposite to each other, wherein the first side plate (18) and the second side plate (19) are respectively connected at opposite ends to the first end plate (16) and the second end plate (17), and a second flow channel (14) is provided inside the first side plate (18) and the second side plate (19), and the opposite ends of the second flow channel (14) are respectively connected to the first flow outlet (22) and the liquid outlet (12).

3. The box according to claim 1, wherein: The box body (1) further comprises a bottom plate (20), opposite ends of the bottom plate (20) being connected to the first end plate (16) and the second end plate (17), respectively; a third flow channel (15) is provided on the inner side of the bottom plate (20), and opposite ends of the third flow channel (15) are communicated with the first outflow port (22) and the liquid outlet (12), respectively.

4. The box according to claim 3, wherein: A second flow outlet (24) is provided in the middle region of the first flow channel (21), and the second flow outlet (24) is communicated with the third flow channel (15).

5. The box according to claim 4, wherein: The flow area of ​​the second flow outlet (24) is smaller than the flow area of ​​the first flow outlet (22).

6. The box according to claim 1, wherein: A fourth flow channel (23) is provided on the side of the partition (2), and opposite ends of the fourth flow channel (23) are respectively in communication with the first outflow port (22) and the liquid outlet (12).

7. The box according to claim 1, wherein: The box body (1) further comprises an abutment plate (4) arranged on the inner sides of the first end plate (16) and the second end plate (17); the abutment plate (4) is arranged between the first end plate (16) and the battery cell (5) of the battery pack, and / or between the second end plate (17) and the battery cell (5) of the battery pack.

8. A battery cell liquid cooling box, comprising a box body according to any one of claims 1 to 7 and a box cover (13), wherein the box cover (13) covers the box body.

9. The battery cell liquid cooling box according to claim 8, wherein the box cover (13) comprises a cover body (8), a pressure relief valve (9) is provided on one side of the cover body (8), a discharge outlet (10) is provided at the end of the cover body (8), and a discharge flow channel (81) is provided inside the cover body (8), one end of the discharge flow channel (81) is communicated with the pressure relief valve (9), and the other end of the discharge flow channel (81) is communicated with the discharge outlet (10).

10. The battery cell liquid cooling box according to claim 9, wherein: The cover body (8) includes a main body and a raised portion (82) protruding from the main body. The pressure relief valve (9) is located on a surface of the raised portion (82) facing away from the main body. The discharge flow channel (81) extends into the raised portion (82) and is communicated with the pressure relief valve (9). The discharge flow channel (81) located in the raised portion (82) forms a first cavity.

11. The battery cell liquid cooling box according to claim 9, wherein: A second cavity is formed in the pressure relief valve (9), and the volume of the second cavity is smaller than the volume of the first cavity.

12. The battery cell liquid cooling box according to claim 10, wherein: The first cavity and the second cavity are both cylindrical, and the inner diameter of the second cavity is smaller than the inner diameter of the first cavity.

13. The battery cell liquid cooling box according to claim 8, wherein: The pressure relief valve (9) is provided with an elastic sealing member around the valve port, and the elastic sealing member is configured to abut against the outer periphery of the valve port of the explosion-proof valve (511) of the battery cell (51).

14. The battery cell liquid cooling box according to claim 8, wherein: The cover body (8) is provided with a hole portion.

15. The battery cell liquid cooling box according to claim 8, wherein: An extension portion (85) is provided at the end of the cover body (8), and the discharge flow channel (81) extends to the extension portion (85) and passes through the extension portion (85).

16. A battery pack, comprising the battery cell liquid cooling box according to any one of claims 8 to 15, and a plurality of battery cells (5), wherein the plurality of battery cells (5) are installed in the battery cell installation cavity (3).

17. The battery pack according to claim 16, wherein: The battery unit (5) comprises a plurality of battery cells (51), the plurality of battery cells (51) are sequentially spaced apart, and a fifth flow channel (52) is defined between the battery cells (51).

18. The battery pack according to claim 16, further comprising a mounting shell (6) and a shell cover (7), wherein the mounting shell (6) comprises: a first accommodating cavity (61), the box body being located in the first accommodating cavity (61), and / or; a second accommodating cavity (62), the second accommodating cavity (62) being configured to accommodate a battery management system module, and / or; A third accommodating cavity (63) is formed between the top of the box body and the shell cover (7), and is configured to accommodate a CCS component.

19. A battery pack, comprising a cell liquid cooling box and a cell (51) according to any one of claims 8 to 15, wherein the box cover (13) covers the box body (1), a cell immersion cavity is formed in the box body (1), the cell (51) is installed in the cell immersion cavity, and the box cover (13) covers the cell immersion cavity and is fixed to the box body (1).

20. A battery pack, comprising a box cover, a battery cell (51) and an installation shell (6) in a battery cell liquid cooling box according to any one of claims 8 to 15, wherein a battery cell immersion cavity is formed in the installation shell (6), the battery cell (51) is installed in the battery cell immersion cavity, and the box cover (13) covers the battery cell immersion cavity and is fixed to the installation shell (6).

21. The battery pack according to any one of claims 19 to 20, wherein: The pressure relief valve (9) on the box cover (13) faces the explosion-proof valve (511) of the battery cell (51) and is in interference contact with the explosion-proof valve (511) of the battery cell (51).

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