Battery cell liquid cooling box and battery pack

Abstract

The utility model provides a battery cell liquid cooling box and a battery pack, relates to the technical field of batteries, and aims to solve the problem of poor temperature difference balance of battery cells in the battery pack. The battery cell liquid cooling box comprises a box body which is provided with a first end plate and a second end plate which are oppositely arranged, and the first end plate is provided with a liquid inlet and a liquid outlet; the partition plate is arranged in the box body, extends from the first end plate to the second end plate and divides the interior of the box body into a plurality of battery cell mounting cavities, a first flow channel is formed in the partition plate, one end of the first flow channel is communicated with the liquid inlet, and the other end of the first flow channel is communicated with the liquid outlet; the other end of the first flow channel extends towards the second end plate and is provided with a plurality of first flow outlets, the plurality of first flow outlets are communicated with the plurality of battery cell mounting cavities, and the plurality of battery cell mounting cavities are also communicated with the liquid outlet.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell liquid cooling box and a battery pack. Background Art

[0002] In the battery field, traditional heat dissipation methods generally include natural cooling, air cooling, phase change cooling or bottom liquid cooling plate cooling, but the above-mentioned heat dissipation methods are difficult to solve the problem of 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 difference between battery cells. Utility Model Content

[0003] In view of this, the present application provides a battery cell liquid cooling box and a battery pack, which are used to improve the problem of poor temperature difference balance of battery cells in the battery cell liquid cooling box.

[0004] The technical solution adopted by this application to solve the above technical problems is:

[0005] In a first aspect, the present application provides a battery cell liquid cooling box, comprising:

[0006] The box body has a first end plate and a second end plate which are 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 the interior of the box body is divided into multiple battery cell installation cavities. A first flow channel is provided inside the partition, one end of the first flow channel is connected to the liquid inlet, and 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 connected to the multiple battery cell installation cavities, and the multiple battery cell installation cavities are also connected to the liquid outlet.

[0008] In some embodiments of the present application, the box body also includes a first side panel and a second side panel arranged opposite to each other, and the opposite ends of the first side panel and the second side panel are respectively connected to the first end plate and the second end plate, and second flow channels are arranged on the inner sides of the first side panel and the second side panel, and the opposite ends of the second flow channel are respectively connected to the first flow outlet and the liquid outlet.

[0009] In some embodiments of the present application, the box body also includes a bottom plate, the opposite ends of which are respectively connected to the first end plate and the second end plate, a third flow channel is provided on the inner side of the bottom plate, and the opposite ends of the third flow channel are respectively connected to the first flow outlet and the liquid outlet.

[0010] In some embodiments of the present application, a second flow outlet is provided in the middle area of ​​the first flow channel, and the second flow outlet is communicated with the third flow channel.

[0011] In some embodiments of the present application, the aperture of the second outflow port is smaller than the aperture of the first outflow port.

[0012] In some embodiments of the present application, a fourth flow channel is provided on the side of the partition, and opposite ends of the fourth flow channel are respectively connected to the first outflow port and the liquid outlet.

[0013] In some embodiments of the present application, the box body also includes an abutment plate arranged on the inner side of the first end plate and the second end plate, and the abutment plate is configured to be arranged between the first end plate and the battery cell of the battery pack, and / or between the second end plate and the battery cell of the battery pack.

[0014] In a second aspect, the present application further provides a battery pack, comprising a battery cell liquid cooling box as described in any one of the above items, a plurality of battery cells and a box cover, wherein the plurality of battery cells are installed in the battery cell installation cavity.

[0015] Some embodiments of the present application further include an installation housing and a housing cover, wherein the installation housing includes:

[0016] A first accommodating chamber, wherein the battery cell liquid cooling box is located in the first accommodating chamber, and / or;

[0017] a second accommodating cavity, the second accommodating cavity being used to accommodate a battery management system module, and / or;

[0018] A third accommodating chamber is formed between the top of the battery cell liquid cooling box and the shell cover, and is used to accommodate the CCS component.

[0019] In some embodiments of the present application, the battery unit includes a plurality of battery cells, the plurality of battery cells are arranged in sequence at intervals, and a fifth flow channel is defined between the battery cells.

[0020] In summary, due to the adoption of the above technical solution, this application has at least the following beneficial effects:

[0021] The present application provides a battery cell liquid cooling box and a battery pack, wherein a liquid inlet and a liquid outlet are both arranged on a first end plate of the battery cell liquid cooling box, a partition is arranged in the battery cell liquid cooling box to divide the interior of the box into a plurality of battery cell installation cavities, a first flow channel is arranged in the partition, and a plurality of first flow outlets are arranged at an end of the first flow channel away from the first end plate, and the plurality of first flow outlets are connected with the plurality of battery cell installation cavities, so that after the cooling medium is introduced 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 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 arrangement allows the cooling medium to pre-cool the area inside the battery cell liquid cooling 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 battery cell liquid cooling box. As a result, 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 each area of ​​the battery cells in the battery pack, and maintaining the stable operation of the battery cells in the battery cell liquid cooling box. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings of the embodiments are briefly introduced below. Obviously, the drawings described below only relate to some embodiments of the present application, but are not intended to limit the present application, wherein:

[0023] Figure 1 A schematic diagram of the structure of a battery cell liquid cooling box provided in an embodiment of the present application;

[0024] Figure 2 An exploded schematic diagram of a battery cell liquid cooling box provided in an embodiment of the present application;

[0025] Figure 3 A schematic diagram of a cross-sectional structure of a partition provided in an embodiment of the present application;

[0026] Figure 4 A schematic diagram of the structure of a battery pack provided in an embodiment of the present application;

[0027] Figure 5 An exploded schematic diagram of the battery pack provided in an embodiment of the present application.

[0028] The reference numerals are as follows:

[0029] 1. Box body; 11. Liquid inlet; 12. Liquid outlet; 13. Cell liquid cooling box cover; 14. Second flow channel; 15. Third flow channel; 2. Partition; 21. First flow channel; 22. First flow outlet; 23. Fourth flow channel; 24. Second flow outlet; 3. Cell installation cavity; 4. Abutment plate; 5. Battery unit; 51. Cell; 52. Fifth flow channel; 6. Mounting shell; 61. First accommodating cavity; 62. Second accommodating cavity; 7. Shell cover. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0031] In the description of this application, it should be understood that the words "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0032] In this application, the word "exemplary" is used to mean "used as an example, illustration, or description". Any embodiment described in this application as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is given to enable any technician in the field to implement and use the present application. In the following description, details are listed for the purpose of explanation. It should be understood that a person of ordinary skill in the art can recognize that the present application can be implemented without using these specific details. In other instances, known structures and processes are not elaborated in detail to avoid obscuring the description of the present application with unnecessary details. Therefore, the present application is not intended to be limited to the embodiments shown, but is consistent with the widest scope consistent with the principles disclosed in this application.

[0033] In the related art, after the battery cells are installed in the battery cell liquid cooling box, the cooling medium flows unevenly inside the battery cell installation box due to the relatively scattered flow path of the cooling medium, resulting in high cooling capacity in some areas of the battery cell liquid cooling box and low cooling capacity in some areas. As a result, the temperature of some areas inside the battery cell liquid cooling box is high due to the accumulation of heat from the batteries, and the heat dissipation method in the related art is difficult to meet the demand for good temperature balance control in the areas where the battery cells are located inside the battery cell liquid cooling box due to the continuous charging and discharging of high-power battery cells, thereby affecting the performance and life of the battery.

[0034] Based on the above cell liquid cooling box, see Figures 1 to 3 As shown, Figure 1 A schematic diagram of the structure of a battery cell liquid cooling box provided in an embodiment of the present application. Figure 2 This is an exploded schematic diagram of a battery cell liquid cooling box provided in an embodiment of the present application. Figure 3 This is a schematic diagram of a cross-sectional structure of a partition provided in an embodiment of the present application. The present application provides a battery cell liquid cooling box, which includes:

[0035] The box body 1 has a first end plate and a second end plate which are arranged opposite to each other, and the first end plate is provided with a liquid inlet 11 and a liquid outlet 12;

[0036] 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 and the second end plate, 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, and the other end of the first flow channel 21 extends toward the second end plate 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.

[0037] 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, or can be divided into multiple battery cell installation cavities 3.

[0038] It can be understood that, in order to facilitate the setting of the cooling medium circulation device, the liquid inlet 11 and the liquid outlet 12 are both arranged on the first end plate. In the present application, by arranging the liquid inlet 11 and the liquid outlet 12 on the first end plate, combined with the first flow channel and other structures arranged in the partition, the cooling medium can have a longer circulation path, thereby helping to improve the temperature difference balance of each battery cell in the battery cell liquid cooling box.

[0039] It can be understood 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.

[0040] It can be understood that after the battery cell 51 is installed in the battery cell liquid cooling 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 of the battery cell liquid cooling box is located to the end where the second end plate is located. During the introduction process, the area inside the battery cell liquid cooling box that is not easy to dissipate heat (i.e., the central area of ​​the battery cell liquid cooling box body) is pre-cooled, and then circulated from the second end plate of the battery cell liquid cooling box toward the first end plate with the liquid outlet 12 around the battery cell 51. In this way, the temperature difference balance of the area where each battery cell 51 is located in the battery cell liquid cooling box is improved.

[0041] The beneficial effects of the embodiments of the present application are as follows: by arranging the liquid inlet 11 and the liquid outlet 12 on the first end plate of the battery cell liquid cooling box, arranging a partition 2 in the battery cell liquid cooling box to divide the interior of the box body 1 into a plurality of battery cell installation chambers 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, and the plurality of first flow outlets 22 are connected with the plurality of battery cell installation chambers 3, so that after the cooling medium is introduced from the liquid inlet 11, it flows through the first flow channel 21 inside the partition 2 to the second end plate opposite to the first end plate where the liquid inlet 11 is located, and flows into the battery cell installation chamber 3 through the first flow outlet 22, and then gradually flows back to the first end plate, and flows through the liquid outlet located on the first end plate. The cooling medium flows out from the outlet 12, thereby allowing the cooling medium to have 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, thereby helping to improve the cooling effect. In addition, such a structural arrangement allows the cooling medium to pre-cool the area inside the battery cell liquid cooling 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 battery cell liquid cooling box. As a result, 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 each area of ​​the battery cells in the battery pack, and maintaining the stable operation of the battery cells in the battery cell liquid cooling box.

[0042] In some embodiments of the present application, the box body 1 also includes a first side panel and a second side panel that are arranged opposite to each other, and the opposite ends of the first side panel and the second side panel are respectively connected to the first end plate and the second end plate, and a second flow channel 14 is arranged on the inner sides of the first side panel and the second side panel, and the opposite ends of the second flow channel 14 are respectively connected to the first flow outlet 22 and the liquid outlet 12.

[0043] It can be understood that foaming glue can be filled between the battery cell 51 and the first side plate and the second side plate of the battery cell liquid cooling box to form the second flow channel 14. The structure formed by the foaming glue can reduce the space between the battery cell 51 and the first side plate or the second side plate, and reduce and save the amount of cooling medium. Of course, grooves can also be directly made on the inner side of the first side plate and the second side plate to form the second flow channel 14.

[0044] In the embodiment of the present application, a second flow channel 14 is arranged on the inner side of the first side plate and the second side plate, 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 to the first end plate, thereby providing good heat dissipation capacity for the side of the battery cell 51 close to the first side plate and the second side plate.

[0045] Furthermore, the second flow channels 14 may include a plurality of channels, and the extension direction of the second flow channels 14 may be parallel to the length direction of the first side plate and the second side plate.

[0046] In some embodiments of the present application, the box body 1 also includes a bottom plate, the opposite ends of which are respectively connected to the first end plate and the second end plate, and a third flow channel 15 is provided on the inner side of the bottom plate, and the opposite ends of the third flow channel 15 are respectively connected to the first flow port 22 and the liquid outlet 12.

[0047] It can be understood that a third flow channel 15 is provided on the inner side of the bottom plate, 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 each battery cell in the battery pack, and further improving the performance and service life of the battery cell 51.

[0048] 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 connected to the third flow channel 15 .

[0049] It can be understood that since the side of the battery cell close to the first side plate and the second side plate can partially dissipate heat through air cooling, the heat dissipation capacity of the central area and the bottom area of ​​the battery cell liquid cooling box is lower than that of the area close to the side of the battery cell liquid cooling box. In the embodiment of the present application, by setting the second flow outlet 24 in the middle area of ​​the first flow channel 21 and connecting the second flow outlet 24 with the third flow channel 15, the bottom surface of the battery cell 51 has better heat dissipation capacity, thereby further improving the temperature difference balance of each battery cell 51.

[0050] In some embodiments of the present application, the aperture of the second flow outlet 24 is smaller than the aperture of the first flow outlet 22 .

[0051] It can be understood 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.

[0052] 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 cells close to the second end plate, 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 cells, thereby preventing most of the cooling medium from directly flowing back from the middle of the partition 2 to the first end plate. This helps to improve the temperature difference balance of each battery cell in the battery pack.

[0053] 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.

[0054] 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, that is, located in the battery cell installation cavity 3, and the positions of the two on the partition 2 are completely different.

[0055] It can be understood that the fourth flow channel 23 is provided on the side surfaces of both sides 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 battery cell liquid cooling 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 through the fourth flow channel 23, thereby achieving sufficient liquid-cooling contact with the battery cell 51 located in the central area of ​​the battery cell liquid cooling box, and then achieving secondary cooling of the battery cell 51 located in the central area of ​​the battery cell liquid cooling box, thereby further improving the temperature difference balance of each battery cell 51 in the battery cell liquid cooling box.

[0056] Likewise, the fourth flow channel 23 may include a plurality of channels, and the extension direction of the fourth flow channel 23 may be parallel to the extension direction of the partition 2 .

[0057] 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 and the second end plate, and the abutment plate 4 is configured to be arranged between the first end plate and the battery cell of the battery pack, and / or between the second end plate and the battery cell of the battery pack.

[0058] In the embodiment of the present application, an abutment plate 4 is provided on the inner side of the first end plate and the second end plate to block the gap between the battery cell 51 and the inner wall of the box body 1, thereby supporting the battery cell 51, thereby preventing the battery cell 51 from being offset relative to the inner wall of the box body 1 due to the lack of support around the battery cell 51, thereby blocking the normal flow of the cooling medium. It can be understood that a transverse flow channel can be provided on the abutment plate 4 to connect the first flow outlet with the second flow channel; a longitudinal flow channel can also be provided to connect the first flow outlet with the third flow channel. Of course, the transverse flow channel and the longitudinal flow channel here can also be formed by providing a strip spacer between the abutment plate and the battery cell or between the abutment plate and the end plate (the first end plate and / or the second end plate).

[0059] Based on the same inventive concept, see Figures 4 to 5 As shown, Figure 4 A schematic diagram of the structure of a battery pack provided in an embodiment of the present application is shown in FIG. Figure 5 This is an explosion diagram of a battery pack provided in an embodiment of the present application. The present application also provides a battery pack, including a battery cell liquid cooling box as described above and a plurality of battery cells 5, wherein the plurality of battery cells 5 are installed in a battery cell installation cavity 3.

[0060] 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 cell 51 in the battery cell liquid cooling box, the battery pack provided in the embodiment of the present application also has this effect, which will not be repeated here.

[0061] In some embodiments of the present application, the battery pack further includes a mounting shell 6 and a shell cover 7, and the mounting shell 6 includes:

[0062] A first accommodating chamber 61, the battery cell liquid cooling box is located in the first accommodating chamber 61, and / or;

[0063] A second accommodating chamber 62, the second accommodating chamber 62 is used to accommodate a battery management system module, and / or;

[0064] A third accommodating chamber is formed between the top of the battery cell liquid cooling box and the shell cover 7, and is used to accommodate the CCS component.

[0065] It can be understood that based on the needs of easy product molding and improved assembly efficiency, the battery pack can also include an installation shell 6 and a shell cover 7, and the partition 2 is located in the battery cell liquid cooling box. The outer wall of the battery cell liquid cooling box is matched with the inner wall of the installation shell 6, which is convenient for the manufacture and assembly of the battery cell liquid cooling box and the installation shell 6.

[0066] It can be understood that the installation shell 6 includes a first accommodating chamber 61 for accommodating a battery cell liquid cooling box, a second accommodating chamber 62 for accommodating a battery management system module, and a third accommodating chamber formed between the top of the battery cell liquid cooling box 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, thereby ensuring the stable operation of the CCS component and the battery management system module.

[0067] In some embodiments of the present application, the battery unit 5 includes a plurality of battery cells 51 , and the plurality of battery cells 51 are arranged in sequence at intervals, and a fifth flow channel 52 is defined between the battery cells 51 .

[0068] 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 .

[0069] 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 .

[0070] Furthermore, the fifth flow channel 52 may include a plurality of channels, and the extension direction of the fifth flow channel 52 may be parallel to the extension direction of the battery cell.

[0071] The basic concepts have been described above. Obviously, for those skilled in the art, the above detailed disclosure is only for example and does not constitute a limitation of the present application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements and amendments to the present application. Such modifications, improvements and amendments are suggested in the present application, so such modifications, improvements and amendments still belong to the spirit and scope of the exemplary embodiments of the present application.

[0072] At the same time, the present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0073] Similarly, it should be noted that in order to simplify the description of the disclosure of this application and thus help understand one or more application embodiments, in the above description of the embodiments of this application, multiple features are sometimes merged into one embodiment, figure or description thereof. However, this disclosure method does not mean that the features required by the object of this application are more than the features mentioned in the claims. In fact, the features of the embodiments are less than all the features of the single embodiment disclosed above.

[0074] Each patent, patent application, patent application publication, and other materials, such as articles, books, specifications, publications, documents, etc., cited in this application is hereby incorporated by reference in its entirety, except for application history documents that are inconsistent with or conflicting with the content of this application, and documents that limit the broadest scope of the claims of this application (currently or later attached to this application). It should be noted that if the descriptions, definitions, and / or use of terms in the attached materials of this application are inconsistent or conflicting with the content of this application, the descriptions, definitions, and / or use of terms in this application shall prevail.

Claims

1. A battery cell liquid cooling box, characterized in that: include: The box body (1) has a first end plate and a second end plate which are arranged opposite to each other, and the first end plate 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 and the second end plate, 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), and 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 and is provided with a plurality of first flow outlets (22), and 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 battery cell liquid cooling box according to claim 1, characterized in that: The box body (1) further comprises a first side plate and a second side plate which are arranged opposite to each other, the first side plate and the second side plate having respective opposite ends connected to the first end plate and the second end plate, the first side plate and the second side plate having second flow channels (14) arranged inside, the second flow channels (14) having opposite ends connected to the first outflow port (22) and the liquid outlet (12) respectively.

3. The battery cell liquid cooling box according to claim 1, characterized in that: The box body (1) also includes a bottom plate, the opposite ends of which are respectively connected to the first end plate and the second end plate, a third flow channel (15) is provided on the inner side of the bottom plate, and the opposite ends of the third flow channel (15) are respectively connected to the first flow outlet (22) and the liquid outlet (12).

4. The battery cell liquid cooling box according to claim 3, characterized in that: 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 battery cell liquid cooling box according to claim 4, characterized in that: The aperture of the second outflow port (24) is smaller than the aperture of the first outflow port (22).

6. The battery cell liquid cooling box according to claim 1, characterized in that: A fourth flow channel (23) is provided on the side of the partition plate (2), and opposite ends of the fourth flow channel (23) are respectively connected to the first flow outlet (22) and the liquid outlet (12).

7. The battery cell liquid cooling box according to claim 1, characterized in that: The box body (1) also includes an abutment plate (4) arranged on the inner side of the first end plate and the second end plate, and the abutment plate (4) is configured to be arranged between the first end plate and the battery cell of the battery pack, and / or between the second end plate and the battery cell of the battery pack.

8. A battery pack, characterized in that: It comprises a battery cell liquid cooling box according to any one of claims 1 to 7, and a plurality of battery cells (5), wherein the plurality of battery cells (5) are installed in the battery cell installation cavity (3).

9. The battery pack according to claim 8, characterized in that: It also includes a mounting shell (6) and a shell cover (7), wherein the mounting shell (6) includes: A first accommodating chamber (61), the battery cell liquid cooling box being located in the first accommodating chamber (61), and / or; A second accommodating cavity (62), the second accommodating cavity (62) being used to accommodate a battery management system module, and / or; A third accommodating chamber is formed between the top of the battery cell liquid cooling box and the shell cover (7) and is used to accommodate the CCS component.

10. The battery pack according to claim 9, characterized in that: The battery unit (5) comprises a plurality of battery cells (51), the plurality of battery cells (51) are arranged in sequence and at intervals, and a fifth flow channel (52) is defined between the battery cells (51).

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