Battery cell support and immersed liquid-cooled battery pack

Abstract

A battery cell support and an immersed liquid-cooled battery pack. A first surface (4a) of the battery cell support is provided with a plurality of battery cell limiting recesses (41), the battery cell limiting recesses (41) being configured to accommodate battery cells (21) of a battery pack. Each battery cell limiting groove (41) is internally provided with a protruding block (42) configured to support a battery cell (21), and in a state in which an end face of the battery cell (21) abuts against the protruding block (42), an overcurrent gap (41a) is reserved between a groove bottom face of the battery cell limiting recess (41) and the end face of the battery cell (21). The battery cell support is further provided with a second surface (4b) arranged opposite the first surface (4a), the battery cell support is provided with communication holes (43) running through the first surface (4a) and the second surface (4b), the communication holes (43) are configured to be in communication with a liquid hole of a liquid-cooling plate of the battery pack, and in a state in which the battery cells (21) are accommodated in the battery cell limiting recesses (41), the communication holes (43) are in fluid communication with the overcurrent gap (41a) to ensure that a cooling liquid can flow into the battery cell limiting recesses (41), so as to implement liquid-cooling heat dissipation of the parts of the battery cells (21) that are accommodated in the battery cell limiting recesses (41), thereby ensuring the consistency of the overall temperatures of the battery cells (21), and improving the stability of the battery cells (21).

Description

Battery cell holder and immersion liquid-cooled battery pack

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on October 10, 2024, with application number 202422449359.9. The entire contents of the above application are incorporated by reference into this application.

[0002] Technical Field

[0003] The present application relates to the field of battery technology, for example, to a battery cell bracket and an immersion liquid-cooled battery pack.

[0004] Background Art

[0005] A battery pack usually includes a battery box and a battery module housed in the battery box. The battery module is formed by multiple battery cells arranged in a set manner. Among them, the battery cell can be a cylindrical battery cell, a square shell battery cell or a solid battery cell, and can be specifically designed according to the use scenario and usage requirements of the battery pack. Since the outer contour of the cylindrical battery cell is circular, it is difficult to form a stable and reliable limiting fit for the battery module as a whole by relying on the contact and abutment between the cylindrical batteries. Therefore, for battery modules composed of cylindrical batteries, when loading into the battery box, it is usually necessary to use a battery cell holder to limit the cylindrical batteries in the battery module to ensure the stability of the battery module installation and improve the safety of the battery pack.

[0006] In the related art, the battery cell holder has multiple limiting grooves that match the cylindrical battery cells one by one. When assembling the battery module, the cylindrical battery cells are installed one by one into the corresponding limiting grooves. After the battery module is assembled, the battery module is placed in the battery box.

[0007] Technical issues

[0008] For immersion liquid-cooled battery packs, due to the setting of the battery cell holder, it is difficult for the coolant to flow into the limiting groove, resulting in poor cooling effect of the part of the cylindrical battery cell placed in the limiting groove, which can easily cause poor temperature consistency of the cylindrical battery cell and affect the stability of the battery pack.

[0009] Technical Solutions

[0010] In a first aspect, the present application provides a cell holder for an immersion liquid-cooled battery pack, wherein a first surface of the cell holder has a plurality of cell limiting grooves, and the cell limiting grooves are configured to accommodate cells of the immersion liquid-cooled battery pack;

[0011] The battery cell limiting groove is provided with a protrusion configured to support the battery cell. When the end face of the battery cell abuts the protrusion, an overcurrent gap is left between the bottom surface of the battery cell limiting groove and the end face of the battery cell.

[0012] The battery cell holder also has a second surface arranged opposite to the first surface. A connecting hole is provided on the battery cell holder, which passes through the first surface and the second surface. The connecting hole is arranged to be connected to the liquid hole of the liquid cooling plate of the immersion liquid-cooled battery pack, and the connecting hole is connected to the flow gap fluid when the battery cell is accommodated in the battery cell limit groove.

[0013] In a second aspect, the present application provides an immersion liquid-cooled battery pack, comprising a battery module, a liquid cooling plate and a cell holder, wherein the cell holder is located between the battery module and the liquid cooling plate, the first surface of the cell holder faces the battery module, and the second surface of the cell holder faces the liquid cooling plate.

[0014] Beneficial effects

[0015] The present application provides a battery cell holder, wherein the first surface of the battery cell holder has a plurality of battery cell limiting grooves, and the battery cell limiting grooves are configured to accommodate the battery cells of the battery pack; the battery cell limiting grooves have protrusions configured to support the battery cells, and when the end faces of the battery cells are in contact with the protrusions, an overflow gap is left between the bottom surfaces of the battery cell limiting grooves and the end faces of the battery cells; the battery cell holder also has a second surface arranged opposite to the first surface, and the battery cell holder has a connecting hole passing through the first surface and the second surface, and the connecting hole is configured to be connected to the liquid hole of the liquid cooling plate of the battery pack, and the connecting hole is connected to the overflow gap fluid when the battery cells are accommodated in the battery cell limiting grooves, so as to ensure that the coolant can flow into the battery cell limiting grooves, so as to realize liquid cooling and heat dissipation of the portion of the battery cell accommodated in the battery cell limiting grooves, ensure the consistency of the overall temperature of the battery cells, and improve the stability of the battery cells.

[0016] The immersion liquid-cooled battery pack provided in this application can improve the cooling effect of the battery cells, ensure the temperature consistency of the battery cells, and enhance the stability of the battery pack by applying a battery cell holder.

[0017] BRIEF DESCRIPTION OF THE DRAWINGS

[0018] FIG1 is a schematic diagram of the structure of a battery pack provided by some implementations of the present application;

[0019] FIG2 is an exploded schematic diagram of the battery pack in FIG1 ;

[0020] FIG3 is a schematic top view of a battery pack without the second liquid cooling plate provided by some implementations of the present application;

[0021] FIG4 is a schematic cross-sectional view at LL in FIG3 ;

[0022] FIG5 is a schematic cross-sectional view at MM in FIG3 ;

[0023] FIG6 is a schematic structural diagram of a cell support in one direction provided by some implementations of the present application;

[0024] FIG7 is a schematic structural diagram of a cell support provided in another direction in some implementations of the present application;

[0025] FIG8 is a schematic diagram of the partial structure of the battery cell bracket in FIG7 .

[0026] Reference numerals:

[0027] 1. Battery box; 11. Liquid inlet transition hole; 12. Liquid outlet transition hole;

[0028] 2. Battery module; 21. Battery cell;

[0029] 3. Liquid cooling module; 31. First liquid cooling plate; 311. First liquid inlet; 312. First liquid outlet; 32. Second liquid cooling plate; 321. Second liquid inlet; 322. Second liquid outlet;

[0030] 4. Cell support; 4a. First surface; 4b. Second surface; 41. Cell limiting groove; 41a. Overcurrent gap; 42. Bump; 43. Connecting hole; 44. Boss; 45. Groove; 46. Connecting groove;

[0031] 5. Liquid inlet connector;

[0032] 6. Liquid outlet connector.

[0033] Modes for Carrying Out the Invention

[0034] Before any embodiments of the present application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the foregoing drawings.

[0035] In this application, the terms "comprises," "includes," "has," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0036] In this application, the term "and / or" describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Additionally, the character " / " in this application generally indicates that the related objects are in an "and / or" relationship.

[0037] In this application, the terms "connect," "combine," "couple," and "install" may refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without an intermediary, and an indirect connection refers to two parts or components being connected to at least one intermediary, with the two parts or components being connected via the intermediary. Furthermore, "connect" and "couple" are not limited to physical or mechanical connections or couplings and may include electrical connections or couplings.

[0038] Throughout this application, those skilled in the art will understand that relative terms (e.g., "about," "approximately," "substantially," etc.) used in connection with quantities or conditions are inclusive of the value and have the meaning dictated by the context. For example, such relative terms encompass at least the degree of error associated with the measurement of the particular value, as well as tolerances associated with the particular value resulting from manufacturing, assembly, and usage. Such terms should also be considered to disclose a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to a percentage (e.g., 1%, 5%, 10%, or more) of the indicated value. Even values ​​not using relative terms should be disclosed as being within the specified value with the tolerance. Furthermore, "substantially," when used to express a relative angular positional relationship (e.g., "substantially parallel," "substantially perpendicular," etc.), may refer to a value that is plus or minus a certain number of degrees (e.g., 1 degree, 5 degrees, 10 degrees, or more) relative to the indicated angle.

[0039] In this application, it will be understood by those skilled in the art that the function performed by an assembly can be performed by one assembly, multiple assemblies, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one assembly, or a combination of multiple parts.

[0040] In the present application, the terms "upper", "lower", "left", "right", "front", "back" and other directional words are described based on the orientation and positional relationship shown in the accompanying drawings, and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to the other element "upper" or "lower", but also be indirectly connected to the other element "upper" or "lower" through an intermediate element. It should also be understood that directional words such as upper side, lower side, left side, right side, front side, back side, etc. not only represent the positive orientation, but can also be understood as the lateral orientation. For example, below can include directly below, lower left, lower right, lower front and lower back, etc.

[0041] FIG1 is a schematic diagram of the structure of a battery pack provided in an embodiment of the present application. FIG2 is a schematic diagram of an exploded view of the battery pack in FIG1 . As shown in FIG1 and FIG2 , the battery pack provided in the present application includes a battery box 1, a battery module 2, and a cell holder 4, wherein the battery module 2 and the cell holder 4 are both installed in the battery box 1, and the battery module 2 includes a plurality of battery cells 21 arranged in a set manner, and the cell holder 4 is configured to support and limit the battery cells 21 to ensure the stability of the installation of the battery module 2, thereby improving the safety of the battery pack.

[0042] In Figure 2 , the battery cell 21 is a cylindrical cell, multiple of which are arranged in a predetermined pattern to form the battery module 2. Accordingly, the cell holder 4 has a circular cell retaining groove 41 that mates with the cylindrical cell. The bottom of the cell 21 is received within the cell retaining groove 41, securing the cell 21 in position. It is understood that in other embodiments, the cell 21 can also be a prismatic cell or a cell of another shape, without limitation herein.

[0043] For ease of description, the thickness direction of the battery box 1 is referred to as the height direction, the length direction of the battery box 1 is referred to as the first direction, and the width direction of the battery box 1 is referred to as the second direction. It is understood that the length direction of the battery box 1 is the same as the length direction of the cell holder 4, and the width direction of the battery box 1 is the same as the width direction of the cell holder 4.

[0044] The battery pack also includes a liquid cooling module 3, which is configured to perform thermal control on the battery module 2 in the battery box 1 to ensure temperature consistency of the multiple battery cells 21 in the battery module 2, thereby improving the safety and stability of the battery pack.

[0045] The liquid cooling module 3 includes a liquid cooling plate, on which liquid holes are provided, and the liquid holes include a liquid inlet hole and a liquid outlet hole. The liquid cooling plate may include a first liquid cooling plate 31 and a second liquid cooling plate 32, which are respectively mounted on the bottom and top of the battery box 1 and cooperate with the battery box 1 to form a receiving cavity configured to accommodate the battery module 2 and the battery cell holder 4. The liquid holes of the first liquid cooling plate 31 include a first liquid inlet hole 311 and a first liquid outlet hole 312, and the liquid holes of the second liquid cooling plate 32 include a second liquid inlet hole 321 and a second liquid outlet hole 322. During the liquid cooling process, the coolant enters the receiving cavity through the first liquid cooling plate 31 and immerses the battery module 2 to achieve temperature regulation of the battery module 2. After the coolant fills the receiving cavity, the coolant can be discharged through the second liquid cooling plate 32, and then re-enter the receiving cavity through the first liquid cooling plate 31 after cooling, so as to achieve recycling of the coolant.

[0046] In Figure 2, the battery case 1 has an open bottom and top. A first liquid cooling plate 31 is secured to the bottom of the battery case 1 and covers the open bottom. This means that the first liquid cooling plate 31 not only serves as part of the cooling circuit for the liquid cooling module 3 but also serves as the bottom plate structure of the battery case 1. This design not only reduces the material cost of the battery pack but also reduces the overall weight of the battery pack, thereby increasing its energy density. Similarly, a second liquid cooling plate 32 is secured to the top of the battery case 1 and covers the open top. This means that the second liquid cooling plate 32 not only serves as part of the cooling circuit for the liquid cooling module 3 but also serves as the top plate structure of the battery case 1. This design not only reduces the material cost of the battery pack but also reduces the overall weight of the battery pack, thereby increasing its energy density. It is understood that in other embodiments, the battery case 1 may have a separate bottom plate than the first liquid cooling plate 31, and the battery case 1 may have a separate top plate than the second liquid cooling plate 32.

[0047] In order to ensure the sealing of the connection between the first liquid cooling plate 31 and the battery box 1, a sealant is provided at the connection between the battery box 1 and the first liquid cooling plate 31. For example, the bottom end face of the battery box 1 may have an annular recess for accommodating the sealant, so as to limit the sealant and ensure the sealing effect. Similarly, in order to ensure the sealing of the connection between the second liquid cooling plate 32 and the battery box 1, a sealant is provided at the connection between the battery box 1 and the second liquid cooling plate 32. For example, the top end face of the battery box 1 may have an annular recess for accommodating the sealant, so as to limit the sealant and ensure the sealing effect.

[0048] FIG3 is a schematic top view of the battery pack provided in an embodiment of the present application with the second liquid cooling plate 32 removed. FIG4 is a schematic cross-sectional view at LL in FIG3 . As shown in FIG3 to FIG4 and in combination with FIG2 , the side wall of the battery box 1 has a liquid inlet transition hole 11 and a liquid outlet transition hole 12, the first liquid cooling plate 31 has a first liquid inlet hole 311 connected to the liquid inlet transition hole 11, and the second liquid cooling plate 32 has a second liquid outlet hole 322 connected to the liquid outlet transition hole 12. Integrating the transition hole connecting the first liquid cooling plate 31 and the second liquid cooling plate 32 on the side wall of the battery box 1 can simplify the liquid inlet structure of the first liquid cooling plate 31 and the liquid outlet structure of the second liquid cooling plate 32, and reduce the processing difficulty of the first liquid cooling plate 31 and the second liquid cooling plate 32.

[0049] In addition, the liquid cooling module 3 also includes a liquid inlet connector 5 and a liquid outlet connector 6. The liquid inlet connector 5 is installed on the battery box 1 and communicates with the liquid inlet transition hole 11, and the liquid outlet connector 6 is installed on the battery box 1 and communicates with the liquid outlet connector 6. The liquid cooling module 3 also includes a refrigeration device, which is external to the battery box 1, and the liquid outlet end of the refrigeration device is connected to the liquid inlet connector 5, and the liquid inlet end of the refrigeration device is connected to the liquid outlet connector 6. That is, after passing through the refrigeration device, the coolant first enters the first liquid cooling plate 31 through the liquid inlet connector 5, and then enters the accommodating cavity through the first liquid cooling plate 31. After the accommodating cavity is filled with the coolant, the coolant enters the second liquid cooling plate 32, and finally flows back to the refrigeration device through the liquid outlet connector 6, so as to realize the recycling of the coolant and improve the cooling effect of the coolant on the battery module 2.

[0050] FIG5 is a schematic cross-sectional view at MM in FIG3 . As shown in FIG5 in combination with FIG4 and FIG2 , the first liquid cooling plate 31 has a plurality of first liquid outlet holes 312 on the side facing the battery module 2, and the second liquid cooling plate 32 has a plurality of second liquid inlet holes 321 on the side facing the battery module 2. The coolant in the first liquid cooling plate 31 can flow into the accommodating cavity through the first liquid outlet holes 312. During the liquid cooling process, the coolant enters the first liquid cooling plate 31 from the liquid inlet joint 5 through the liquid inlet transition hole 11 and the first liquid inlet hole 311 in sequence, and then flows into the accommodating cavity from the plurality of first liquid outlet holes 312 along the flow channel in the first liquid cooling plate 31; when the coolant in the accommodating cavity submerges the battery module 2 and flows to the lower surface of the second liquid cooling plate 32, the coolant can enter the second liquid cooling plate 32 from the second liquid inlet hole 321, and flow from the second liquid outlet hole 322 to the liquid outlet transition hole 12 along the flow channel in the second liquid cooling plate 32, and finally flow out from the liquid outlet joint 6.

[0051] It is understood that in this embodiment, there is one cell holder 4, which is located below the battery module 2 and above the first liquid cooling plate 31. In other embodiments, there may be two cell holders 4, one of which is located between the battery module 2 and the first liquid cooling plate 31, and the other of which is located between the battery module 2 and the second liquid cooling plate 32.

[0052] Figure 6 is a schematic diagram of the structure of the battery cell support 4 provided in one embodiment of the present application. Figure 7 is a schematic diagram of the structure of the battery cell support 4 provided in another embodiment of the present application. As shown in Figures 6 to 7 and in combination with Figure 5, the first surface 4a of the battery cell holder 4 has a plurality of battery cell limiting grooves 41, each battery cell limiting groove 41 has a protrusion 42 configured to support the battery cell 21, and the battery cell 21 has end faces, namely a bottom face and a top face. When the end face of the battery cell 21 is in contact with the protrusion 42, an overcurrent gap 41a is left between the bottom face of the battery cell limiting groove 41 and the end face of the battery cell 21; for example, when the battery cell holder 4 is located at the bottom of the battery module 2, the bottom face of the battery cell 21 is in contact with the protrusion 42, and an overcurrent gap 41a is left between the bottom face of the battery cell limiting groove 41 and the bottom face of the battery cell 21; when the battery cell holder 4 is located at the top of the battery module 2, the top face of the battery cell 21 is in contact with the protrusion 42, and an overcurrent gap 41a is left between the bottom face of the battery cell limiting groove 41 and the top face of the battery cell 21.

[0053] The battery cell holder 4 also has a connecting hole 43 running through its first surface 4a and the second surface 4b. The connecting hole 43 is connected to the first liquid outlet 312 in a one-to-one correspondence, and the connecting hole 43 is connected to the fluid of the overflow gap 41a when the battery cell 21 is accommodated in the battery cell limiting groove 41, so as to ensure that the coolant can flow into the battery cell limiting groove 41, so as to realize liquid cooling of the part of the battery cell 21 accommodated in the battery cell limiting groove 41, ensure the consistency of the overall temperature of the battery cell 21, and improve the stability of the battery cell 21.

[0054] When the number of battery cell holders 4 in this embodiment is two, one of the battery cell holders 4 is located between the battery module 2 and the first liquid cooling plate 31, and the other battery cell holder 4 is located between the battery module 2 and the second liquid cooling plate 32. The connecting hole 43 on the battery cell holder 4 can be connected to the second liquid inlet hole 321 of the second liquid cooling plate 32. The matching relationship between the battery cell holder 4 and the second liquid cooling plate 32 can refer to the matching relationship between the first liquid cooling plate 31 and the battery cell holder 4, and will not be repeated here.

[0055] In other embodiments, when the number of battery cell holders 4 is two, one battery cell holder 4 is located at the bottom of the battery cell 21 and above the first liquid cooling plate 31, and the other battery cell holder 4 is located at the top of the battery cell 21 and below the second liquid cooling plate 32, wherein the battery cell holder 4 located at the top of the battery cell 21 and below the second liquid cooling plate 32 has a plurality of battery cell limiting grooves 41 on the side facing the battery cell 21 (i.e., the first surface 4a), and each battery cell limiting groove 41 also has a protrusion 42. When the top surface of the battery cell 21 abuts the protrusion 42, an overflow gap is left between the bottom surface of the battery cell limiting groove 41 and the top surface of the battery cell 21. The overflow gap is used to supply cooling liquid to flow to the top surface of the battery cell 21 to achieve temperature regulation of the top surface of the battery cell 21. In this embodiment, the cell holder 4 has a boss 44 on the side facing the first liquid cooling plate 31 (i.e., the second surface 4b) that plugs into the first liquid outlet 312, and the communication hole 43 extends through the boss 44. Inserting the boss 44 into the first liquid outlet 312 not only ensures the proper positioning and assembly of the cell holder 4 and the first liquid cooling plate 31, but also ensures that the coolant flowing out of the first liquid outlet 312 can flow directly and smoothly through the communication hole 43 to the battery module 2.

[0056] In Figure 7 , the boss 44 is cylindrical in shape, the centerline of the communication hole 43 is perpendicular to the cell holder 4, and the communication hole 43 extends through the boss 44. To facilitate the insertion and mating of the boss 44 with the first liquid outlet 312, the first liquid outlet 312 is also circular (see Figure 2 ), and the depth of the boss 44 extending into the first liquid outlet 312 is less than the depth of the flow channel within the first liquid cooling plate 31, ensuring that the coolant in the flow channel can flow smoothly into the communication hole 43.

[0057] On the first surface 4a of the battery cell holder 4, the connecting hole 43 and the battery cell limiting groove 41 are staggered. The connecting hole 43 avoids the battery cells 21 in the battery module 2 to prevent the coolant from being subjected to resistance from the battery cells 21 after flowing out of the connecting hole 43, thereby increasing the flow rate of the coolant. In this embodiment, the battery module 2 includes multiple rows of battery cell groups arranged along the second direction, and the two adjacent battery cell groups are staggered, and each battery cell group includes multiple battery cells 21 arranged along the first direction. The interval between two adjacent battery cells 21 in the same row of battery cell groups is smaller than the interval between two adjacent battery cells 21 in two rows of battery cell groups. Therefore, locating the connecting hole 43 between two adjacent rows of battery cell groups can provide sufficient space for the circulation of the coolant, and the coolant can flow upward along the outer wall of the battery cell 21, which can ensure the stability of the coolant flow and reduce the resistance of the coolant. Similarly, the arrangement of multiple battery cell limiting grooves 41 is as follows: multiple battery cell limiting grooves 41 arranged in sequence along the first direction form a group of battery cell limiting groove groups, multiple groups of battery cell limiting groove groups are arranged along the second direction, and the multiple battery cell limiting grooves 41 in two adjacent groups of battery cell limiting groove groups are staggered to better support the battery cells 21.

[0058] The side of the cell holder 4 facing the battery module 2 (i.e., the first surface 4a) also has a continuous groove 46 extending along the first direction, and the continuous groove 46 penetrates the cell holder 4 along the first direction. A plurality of continuous grooves 46 are arranged at intervals along the second direction, and each continuous groove 46 is configured to connect to the cell limiting grooves 41 arranged in sequence in the first direction. The design of the continuous groove 46 not only facilitates the circulation of coolant between the bottoms of the plurality of battery cells 21, but also serves as an explosion-proof pressure relief channel for the battery cells 21. When the battery cell 21 thermally runs away, the high-pressure gas or jet generated at the explosion-proof valve of the battery cell 21 can be quickly discharged from the continuous groove 46 to the outside of the battery cell holder 4 to improve the safety of the battery pack.

[0059] Each cell limiting groove 41 has two symmetrical and spaced protrusions 42 , and the space between the two protrusions 42 in each cell limiting groove 41 is connected to the connecting groove 46 to reduce the resistance of the protrusions 42 to the coolant and ensure that the coolant can flow smoothly.

[0060] In Figure 6, the bumps 42 within each cell retaining groove 41 are arc-shaped, and the centers of the two bumps 42 within each cell retaining groove 41 coincide. These arc-shaped bumps are designed to accommodate the shape and structure of the cylindrical cell 21, providing better support and stability. Furthermore, structural adhesive is placed between the bottom of the cell 21 and the bumps 42, improving the stability of the cell 21 installation.

[0061] Figure 8 is a schematic diagram of a partial structure of the cell holder 4 in Figure 7 . As shown in Figure 8 and Figure 7 , the cell holder 4 further has a groove 45 on the side facing the first liquid cooling plate 31. Groove 45 is offset from boss 44 and is configured to accommodate structural adhesive, which is used to strengthen the connection between the cell holder 4 and the first liquid cooling plate 31. Furthermore, because the liquid inlet end of the communication hole 43 is disposed on boss 44, which is higher than the groove 45 of the cell holder 4, this effectively prevents the structural adhesive from overflowing into the liquid inlet end of the communication hole 43, thereby preventing the structural adhesive from clogging the communication hole 43.

[0062] In this embodiment, there are multiple grooves 45, and all grooves 45 penetrate the cell holder 4 along the length direction (i.e., the first direction) of the cell holder 4. In other embodiments, all grooves 45 penetrate the cell holder 4 along the width direction (i.e., the second direction) of the cell holder 4, which is not limited here.

Claims

1. A cell holder for an immersion liquid-cooled battery pack, wherein a first surface (4a) of the cell holder has a plurality of cell limiting grooves (41), and the cell limiting grooves (41) are configured to accommodate the cells (21) of the immersion liquid-cooled battery pack; The battery cell limiting groove (41) has a protrusion (42) configured to support the battery cell (21), and when the end surface of the battery cell (21) is in contact with the protrusion (42), an overcurrent gap (41a) is left between the bottom surface of the battery cell limiting groove (41) and the end surface of the battery cell (21); The battery cell holder further comprises a second surface (4b) arranged opposite to the first surface (4a); a connecting hole (43) penetrating the first surface (4a) and the second surface (4b) is provided on the battery cell holder; the connecting hole (43) is arranged to communicate with a liquid hole of a liquid cooling plate of the immersion liquid cooling battery pack; and the connecting hole (43) is in fluid communication with the overflow gap (41a) when the battery cell (21) is accommodated in the battery cell limiting groove (41).

2. The battery cell support according to claim 1, wherein: The second surface (4b) of the battery cell support has a boss (44) configured to be plugged into and engaged with the liquid hole, and the communication hole (43) passes through the boss (44).

3. The battery cell support according to claim 2, wherein: The second surface (4b) of the battery cell support further comprises a groove (45) configured to accommodate structural adhesive, and the groove (45) and the boss (44) are arranged in a staggered manner.

4. The battery cell support according to claim 3, wherein: There are multiple grooves (45), and the multiple grooves (45) penetrate the battery cell holder along a first direction; or the multiple grooves (45) penetrate the battery cell holder along a second direction, wherein the first direction and the second direction intersect.

5. The battery cell support according to claim 1, wherein: On the first surface (4a) of the battery cell support, the communication hole (43) and the battery cell limiting groove (41) are arranged in a staggered manner.

6. The battery cell support according to any one of claims 1 to 5, wherein: The arrangement of the plurality of battery cell limiting grooves (41) is as follows: a plurality of battery cell limiting grooves (41) sequentially arranged along the first direction form a group of battery cell limiting grooves, a plurality of groups of battery cell limiting grooves are arranged along the second direction, and the plurality of battery cell limiting grooves (41) in two adjacent groups of battery cell limiting grooves are staggered.

7. The battery cell support according to claim 6, wherein: The first surface (4a) of the battery cell support further comprises a plurality of connecting grooves (46), each connecting groove (46) passing through the battery cell support along the first direction, the plurality of connecting grooves (46) being arranged at intervals along the second direction, and each connecting groove (46) being arranged to communicate with the battery cell limiting grooves (41) arranged in sequence in the first direction.

8. The battery cell support according to claim 7, wherein: Each of the battery cell limiting grooves (41) has two symmetrical and spaced-apart protrusions (42), and the space between the two protrusions (42) in each of the battery cell limiting grooves (41) is connected to the connecting groove (46).

9. An immersion liquid-cooled battery pack, comprising a battery module (2), a liquid cooling plate, and a cell holder according to any one of claims 1 to 8, wherein the cell holder is located between the battery module (2) and the liquid cooling plate, a first surface (4a) of the cell holder faces the battery module (2), and a second surface (4b) of the cell holder faces the liquid cooling plate.

10. The immersion liquid-cooled battery pack according to claim 9, further comprising a battery box (1), wherein the battery box (1) has openings at both ends in its height direction, and the number of the liquid cooling plates is two, wherein one of the two liquid cooling plates is fixed to the top of the battery box (1) and covers the corresponding opening, and the other liquid cooling plate is fixed to the bottom of the battery box (1) and covers the corresponding opening.

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