Battery unit and battery pack

Abstract

A battery unit and a battery pack. The battery unit comprises a battery cell group (100) and a cooling assembly, wherein the battery cell group (100) comprises a plurality of battery cells (110) which are sequentially arranged, a gap being provided between every two or more adjacent battery cells (110), and a plurality of gaps being provided; and the cooling assembly comprises a cooling plate (210) and a plurality of cooling columns (220), a refrigerant circulating in the cooling plate (210), the cooling plate (210) being located at ends of the battery cells (110), the plurality of cooling columns (220) respectively being arranged in the plurality of gaps, and the cooling columns (220) being configured to cool side walls of the battery cells (110). The cooling assembly is capable of cooling both the ends and the side walls of the battery cells (110), and the assembly process of the cooling assembly and the battery cell group (100) is relatively simple.

Description

Battery cells and battery packs

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on September 26, 2023, with application number 202322620572.7. 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 and a battery pack.

[0004] Background Art

[0005] A battery pack typically consists of a battery case and multiple battery cells, which are arranged in a sequence to form a battery unit and installed in the battery case. During the charging and discharging process, the battery cells generate heat. To cool the cells, a cooling device is often installed in the battery case to absorb the heat generated by the cells.

[0006] Technical issues

[0007] For cylindrical battery cells, a common cooling device is a liquid cooling plate, which mainly includes flat plate and serpentine plate types. The flat plate liquid cooling plate is arranged at the bottom or top of the battery cell. The assembly process of the flat plate liquid cooling plate and the battery cell is relatively simple, but the flat plate liquid cooling plate can only cool the bottom or top of the battery cell, and the cooling effect is poor; the serpentine plate liquid cooling plate is clamped between two adjacent columns of battery cells, so the serpentine plate liquid cooling plate can cool the side walls of the battery cell, and the cooling effect is better, but when assembling the serpentine plate liquid cooling plate and the battery cell, the serpentine plate liquid cooling plate needs to be clamped between two adjacent columns of battery cells. The assembly process is relatively complicated, which reduces production efficiency.

[0008] Technical Solutions

[0009] An embodiment of the present application provides a battery cell, comprising:

[0010] A battery cell group includes a plurality of battery cells, the plurality of battery cells are arranged in sequence, and a gap is provided between two or more adjacent battery cells, and the number of gaps is multiple;

[0011] The cooling assembly includes a cooling plate and multiple cooling columns. A refrigerant flows in the cooling plate. The cooling plate is located at the end of the battery cell. The multiple cooling columns are respectively arranged in multiple gaps. The cooling columns are configured to cool the side walls of the battery cell.

[0012] In some embodiments, the cooling column includes a cooling portion and a connecting portion, the cooling portion is connected to the connecting portion, the cooling portion is located in the gap, and the cooling portion is configured to cool the side wall of the battery cell, and the connecting portion is connected to the cooling plate.

[0013] In some embodiments, the cooling portion and the connecting portion are both heat-conducting elements, the connecting portion is disposed through the cooling plate, and the cooling portion is heat-conductingly connected to the refrigerant through the connecting portion.

[0014] In some embodiments, the cooling plate includes a first cavity, the cooling part is a heat-conducting element, and the cooling part includes a second cavity, the connecting part includes a third cavity, the second cavity is connected to the first cavity through the third cavity, and the refrigerant circulates in the first cavity, the second cavity and the third cavity.

[0015] In some embodiments, the cooling plate includes a first cavity and a fourth cavity, the refrigerant flows in the first cavity, the connecting portion passes through the fourth cavity, and the fourth cavity is filled with glue.

[0016] In some embodiments, the battery unit further includes a bracket, which is disposed on the cooling plate and has a mounting hole formed therein, into which the battery cell is inserted.

[0017] In some embodiments, a pressure relief groove is provided on the side of the bracket facing the cooling plate, the pressure relief groove cooperates with the cooling plate to form a pressure relief cavity, and the pressure relief groove is connected to the mounting hole, the battery cell includes a pressure relief valve, and the pressure relief valve is located in the mounting hole.

[0018] In some embodiments, the pressure relief groove is a through groove or a half-through groove.

[0019] In some embodiments, the outer wall of the cooling column includes a contoured surface, which is adapted to the shape of the battery cell and fits the outer wall of the battery cell.

[0020] In some embodiments, the number of contoured surfaces is equal to and corresponds to the number of battery cells forming the gap.

[0021] In some embodiments, the battery unit further includes at least two side plates, which correspond one-to-one to and are connected to at least two side walls of the cooling plate, and the at least two side plates cooperate with the cooling plate to form a box body, and the battery cell group and multiple cooling columns are all arranged in the box body.

[0022] In some embodiments, the gap includes a first gap and a second gap, the cooling column is arranged in the first gap, and the second gap and the space between the battery cell group and the side plate are filled with adhesive.

[0023] An embodiment of the present application further provides a battery pack, comprising a battery management system and the battery unit in some embodiments of the present application, wherein the battery management system is electrically connected to the battery cell group.

[0024] Beneficial effects

[0025] The battery unit provided in the present application includes a battery cell group and a cooling assembly. The battery cell group includes multiple battery cells arranged in sequence. There is a gap between two or more adjacent battery cells, and the number of gaps is multiple. The cooling assembly includes a cooling plate and multiple cooling columns. The cooling plate is arranged at the end of the battery cell to cool the end of the battery cell. The multiple cooling columns are respectively arranged in the multiple gaps to cool the side walls of the battery cell. It can be seen that the cooling assembly can cool the end and side walls of the battery cell at the same time, thereby improving the cooling effect of the battery cell. At the same time, when assembling the cooling assembly and the battery cell group, it is only necessary to set the cooling plate at the end of the battery cell and the cooling column in the gap. The assembly process is relatively simple, which improves production efficiency.

[0026] The battery pack provided in the present application adopts the battery cells in some embodiments of the present application, which has high production efficiency and can cool the battery cells more efficiently during the charging and discharging process, providing strong guarantees for the safety of use and service life of the battery pack.

[0027] BRIEF DESCRIPTION OF THE DRAWINGS

[0028] FIG1 is a schematic diagram of an exploded structure of a battery cell provided in some embodiments of the present application;

[0029] FIG2 is a first structural diagram of a battery unit provided in some embodiments of the present application;

[0030] FIG3 is a second structural diagram of a battery unit provided in some embodiments of the present application;

[0031] FIG4 is a partial enlarged view of point A in FIG3 ;

[0032] FIG5 is an enlarged view of a partial structure of a stent provided in some embodiments of the present application;

[0033] FIG6 is a schematic diagram of the assembly structure of the cooling plate and the connecting portion provided in some embodiments of the present application;

[0034] FIG7 is a schematic structural diagram of a cooling column provided in some embodiments of the present application;

[0035] FIG8 is a schematic cross-sectional view of a cooling column provided in some embodiments of the present application;

[0036] FIG9 is a schematic structural diagram of a battery pack provided in some embodiments of the present application.

[0037] In the picture:

[0038] 100, battery cell group; 110, battery cell; 101, first gap; 111, second gap; 210, cooling plate; 211, first cavity; 212, fourth cavity; 213, plate; 2131, second jack; 214, partition; 220, cooling column; 221, cooling part; 2212, contoured surface; 222, connecting part; 300, bracket; 310, mounting hole; 320, pressure relief groove; 321, pressure relief cavity; 330, first jack; 400, side panel; 500, box; 610, liquid inlet pipe; 620, liquid outlet pipe; 700, battery management system.

[0039] Modes for Carrying Out the Invention

[0040] 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 these terms in this application based on the specific circumstances.

[0041] 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 may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or may indicate that the first feature is at a higher level 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, or may indicate that the first feature is at a lower level than the second feature.

[0042] 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. These terms are used to facilitate description and simplify operation, and do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Furthermore, the terms "first" and "second" are used for descriptive purposes only and do not have any special meanings.

[0043] Example 1

[0044] This embodiment provides a battery unit that not only improves the cooling effect on the battery cell 110 but also simplifies the assembly process of the battery unit.

[0045] Exemplarily, as shown in Figures 1 to 4, the battery unit includes a cell group 100 and a cooling assembly, wherein the cell group 100 includes a plurality of cell 110, the plurality of cell 110 are arranged in sequence, and gaps are provided between two or more adjacent cell 110, and the number of gaps is multiple, the cooling assembly includes a cooling plate 210 and a plurality of cooling columns 220, a refrigerant flows in the cooling plate 210, the cooling plate 210 is located at the end of the cell 110, and the plurality of cooling columns 220 are respectively arranged in the plurality of gaps, and the cooling columns 220 are configured to cool the side walls of the cell 110.

[0046] Based on the above design, the battery unit includes a cell group 100 and a cooling assembly. The cell group 100 includes a plurality of cell 110 arranged in sequence. A gap is provided between two or more adjacent cell 110, and the number of gaps is multiple. The cooling assembly includes a cooling plate 210 and a plurality of cooling columns 220. The cooling plate 210 is arranged at the end of the cell 110 to cool the end of the cell 110. The plurality of cooling columns 220 are respectively arranged in the plurality of gaps to cool the side walls of the cell 110. It can be seen that the cooling assembly can cool the end and side walls of the cell 110 at the same time, thereby improving the cooling effect of the cell 110. At the same time, when assembling the cooling assembly and the cell group 100, it is only necessary to set the cooling plate 210 at the end of the cell 110 and the cooling column 220 in the gap. The assembly process is relatively simple, which improves production efficiency.

[0047] The cooling medium circulating in the cooling plate 210 may be cooling water or refrigerant, depending on actual use requirements.

[0048] The multiple battery cells 110 may be arranged in sequence along one direction or along two mutually perpendicular directions. The battery cells 110 may be square battery cells 110 or cylindrical battery cells 110. For example, when the multiple square battery cells 110 are arranged in sequence along one direction, the gap is the gap between two adjacent square battery cells 110; when the multiple cylindrical battery cells 110 are arranged in sequence along two mutually perpendicular directions, and two adjacent rows of cylindrical battery cells 110 are staggered, the gap is the gap between three adjacent cylindrical battery cells 110; when the multiple cylindrical battery cells 110 are arranged in sequence along two mutually perpendicular directions, and two adjacent rows of cylindrical battery cells 110 are arranged side by side, the gap is the gap between four adjacent cylindrical battery cells 110. This embodiment is described by taking the case where the multiple cylindrical battery cells 110 are arranged in sequence along two mutually perpendicular directions, and the two adjacent rows of cylindrical battery cells 110 are staggered as an example.

[0049] In some embodiments, as shown in Figures 1 to 4, the cooling plate 210 is disposed at the bottom of the battery cell 110 to cool the bottom of the battery cell 110. Of course, in other embodiments, the cooling plate 210 can also be disposed on the top of the battery cell 110 to cool the top of the battery cell 110.

[0050] In some embodiments, as shown in Figures 1 to 5, the battery unit also includes a bracket 300, which is arranged on the cooling plate 210. The bracket 300 is provided with a mounting hole 310 and a first socket 330. The battery cell 110 is inserted into the mounting hole 310 to fix the battery cell 110, and the cooling column 220 is inserted into the first socket 330 to position the cooling column 220.

[0051] In this embodiment, a bracket 300 is provided between the battery cell 110 and the cooling plate 210. Therefore, the heat emitted by the end of the battery cell 110 can be transferred to the cooling plate 210 through the bracket 300, or can be transferred to the cooling plate 210 through the first jack 330, so that the cooling plate 210 cools the end of the battery cell 110. That is, in this embodiment, the cooling method of the cooling plate 210 for the end of the battery cell 110 is indirect cooling. Of course, in other embodiments, if the end of the battery cell 110 is in direct contact with the cooling plate 210, the heat emitted by the end of the battery cell 110 is directly transferred to the cooling plate 210, so that the cooling plate 210 cools the end of the battery cell 110.

[0052] In some embodiments, as shown in Figures 1 to 6, a pressure relief groove 320 is provided on the side of the bracket 300 facing the cooling plate 210, and the notch of the pressure relief groove 320 faces the cooling plate 210, so that the pressure relief groove 320 and the cooling plate 210 cooperate to form a pressure relief chamber 321, and the mounting hole 310 is opened at the bottom of the pressure relief groove 320, so that the pressure relief groove 320 is connected to the mounting hole 310, and the battery cell 110 includes a pressure relief valve, and the pressure relief valve is located in the mounting hole 310. When the battery cell 110 has thermal runaway, the high-temperature and high-pressure material in the battery cell 110 shell is ejected by the pressure relief valve and sprayed into the pressure relief chamber 321 through the mounting hole 310, avoiding being sprayed to other areas outside the pressure relief chamber 321, thereby avoiding the high-temperature and high-pressure material in the battery cell 110 shell from being sprayed to other areas after the battery cell 110 has thermal runaway, causing heat spread, thereby improving the safety of the battery unit.

[0053] In some embodiments, the bracket 300 is made of plastic material, which has good structural strength and good insulation properties, thereby achieving an insulation effect between the battery cell group 100 and the cooling plate 210 .

[0054] In some embodiments, as shown in Figures 1 to 6, the pressure relief groove 320 is a through groove or a semi-through groove, so that the pressure relief chamber 321 forms an open structure. After the high-temperature and high-pressure material in the battery cell 110 shell is sprayed into the pressure relief chamber 321, it can be discharged from the pressure relief chamber 321 through the opening, thereby achieving pressure relief of the battery unit and improving the overall safety of the battery unit.

[0055] In some embodiments, as shown in Figures 1 to 7, the cooling column 220 includes a cooling portion 221 and a connecting portion 222. The cooling portion 221 is connected to the connecting portion 222. The cooling portion 221 is located within the gap and is configured to cool the sidewall of the battery cell 110. The connecting portion 222 is connected to the cooling plate 210 to secure the cooling column 220 and prevent it from moving within the gap. In this embodiment, the cooling plate 210 is provided with a first socket 330, and the connecting portion 222 is inserted into the first socket 330 to achieve connection between the connecting portion 222 and the cooling plate 210.

[0056] In some embodiments, as shown in Figures 1 to 7, the cooling plate 210 includes a first cavity 211, and the cooling part 221 is a heat-conducting element. Exemplarily, the cooling part 221 can be made of a material with heat-conducting properties such as copper, aluminum or thermally conductive glue. The cooling part 221 includes a second cavity, and the connecting part 222 includes a third cavity. The second cavity is connected to the first cavity 211 through the third cavity, and the refrigerant circulates in the first cavity 211, the second cavity and the third cavity to achieve communication between the cooling column 220 and the cooling plate 210. A liquid inlet pipe 610 and a liquid outlet pipe 620 connected to the external cooling system are installed on the cooling plate 210, and the liquid inlet pipe 610 and the liquid outlet pipe 620 are both connected to the first cavity 211. This can achieve the effect that the cooling column 220 and the cooling plate 210 share a set of liquid inlet pipes 610 and liquid outlet pipes 620 to be connected to the external cooling system, thereby reducing the number of connecting components used, simplifying the structure of the cooling assembly, and reducing production costs.

[0057] The structures of the second cavity and the third cavity can be in various forms, as long as the refrigerant can be circulated in the cooling plate 210 and the cooling column 220 .

[0058] In this embodiment, the liquid inlet pipe 610 and the liquid outlet pipe 620 are mounted on the cooling plate 210. After the refrigerant in the second cavity absorbs the heat from the battery cell 110, it enters the first cavity 211 through the third cavity (i.e., the refrigerant in the cooling column 220 enters the cooling plate 210), and then enters the external cooling system through the liquid outlet pipe 620, thereby removing the heat from the battery cell 110. When both the liquid inlet pipe 610 and the liquid outlet pipe 620 are mounted on the cooling column 220, the refrigerant in the first cavity 211 absorbs the heat from the battery cell 110, then enters the second cavity through the third cavity (i.e., the refrigerant in the cooling plate 210 enters the cooling column 220), and then enters the external cooling system through the liquid outlet pipe 620, thereby also removing the heat from the battery cell 110.

[0059] The structure of the external cooling system and the communication method with the liquid inlet pipe 610 and the liquid outlet pipe 620 are both common in the art.

[0060] In some embodiments, as shown in Figures 1 to 7, the cooling plate 210 also includes a fourth cavity 212, and the connecting portion 222 is passed through the fourth cavity 212 and extends into the first cavity 211, so that the second cavity can be connected to the first cavity 211 through the third cavity. The fourth cavity 212 is filled with glue to bond the connecting portion 222 to the cooling plate 210, thereby achieving bonding and fixing of the cooling column 220 and the cooling plate 210, thereby improving the stability and reliability of the connection between the cooling column 220 and the cooling plate 210.

[0061] In some embodiments, as shown in Figures 1 to 7, the cooling plate 210 includes a plate body 213 and a partition 214, the plate body 213 is provided with a cavity, the partition 214 is arranged on the inner wall of the cavity, and the partition 214 divides the cavity into a first cavity 211 and a fourth cavity 212, a second socket 2131 is provided on the plate body 213, and a third socket is provided on the partition 214, and the connecting part 222 is sequentially inserted into the first socket 330, the second socket 2131 and the third socket to realize the connection between the connecting part 222 and the cooling plate 210, and to connect the third cavity on the connecting part 222 with the first cavity 211 on the cooling plate 210.

[0062] In some embodiments, the adhesive filled in the fourth cavity 212 is a thermally conductive adhesive, which not only enables the connection portion 222 to be bonded to the cooling plate 210 , but also improves the thermal conductivity of the cooling column 220 and the cooling plate 210 , thereby improving the cooling efficiency of the battery cell 110 .

[0063] In some embodiments, as shown in Figures 1 to 7 , the outer wall of the cooling portion 221 includes a contoured surface 2212. The contoured surface 2212 conforms to the shape of the battery cell 110 and conforms to the outer wall of the battery cell 110 to enhance the cooling effect of the cooling portion 221 on the sidewall of the battery cell 110. In this embodiment, the battery cell 110 is cylindrical, and therefore, the contoured surface 2212 is an arcuate surface. If the battery cell 110 is a square battery cell 110, the contoured surface 2212 is a planar structure.

[0064] In some embodiments, as shown in Figures 1 to 7, the number of contoured surfaces 2212 is equal to the number of battery cells 110 forming the gap and corresponds one to one, so that the side wall of each battery cell 110 forming the gap can fit with a contoured surface 2212 located in the gap, thereby improving the cooling effect of the cooling portion 221 located in the gap on the side wall of each battery cell 110 forming the gap, and also improving the space utilization of the gap, which has the effect of reducing the volume of the battery cell and increasing the energy density of the battery cell.

[0065] In this embodiment, two adjacent rows of cylindrical battery cells 110 are arranged in an alternating manner. Therefore, in this embodiment, the cooling portion 221 is roughly triangular prism-shaped. In other embodiments, the cooling portion 221 may also be other shapes. For example, when two adjacent rows of cylindrical battery cells 110 are arranged side by side, the cooling portion 221 is roughly quadrangular prism-shaped.

[0066] In some embodiments, the number of cooling portions 221 attached to the outer wall of each cylindrical battery cell 110 is determined by the diameter of the cylindrical battery cell 110 and the curvature of the contoured surface 2212. In this embodiment, three cooling portions 221 are attached to the outer wall of each cylindrical battery cell 110. When at least one of the diameter of the cylindrical battery cell 110 and the curvature of the contoured surface 2212 changes, the number of cooling portions 221 attached to the outer wall of each cylindrical battery cell 110 will also change. For example, four, five or six cooling portions 221 can be attached to the outer wall of each cylindrical battery cell 110. The diameter of the cylindrical battery cell 110 and the curvature of the contoured surface 2212 can be determined according to actual conditions.

[0067] In some embodiments, the contoured surface 2212 may be manufactured by stamping or injection molding. Both stamping and injection molding are relatively mature production processes in the art, and are simple and low-cost.

[0068] In some embodiments, as shown in Figures 1 to 7, the battery unit also includes at least two side plates 400, and the at least two side plates 400 correspond to and are connected to at least two side walls of the cooling plate 210 one by one, and the at least two side plates 400 cooperate with the cooling plate 210 to form a box body 500. The battery cell group 100 and multiple cooling columns 220 are all arranged in the box body 500, thereby forming an integrated structure of the cooling plate 210 and the box body 500. Once the battery cell group 100 and the cooling plate 210 are assembled, the battery cell group 100 is positioned in the box, which is conducive to realizing the module-free structure of the battery pack (Cell To Pack, CTP), and has the effect of improving the battery pack grouping efficiency.

[0069] In this embodiment, the cooling plate 210 is roughly a rectangular structure, and the number of side panels 400 is two, and the two side panels 400 are respectively connected to the two opposite side walls of the cooling plate 210 to form a box body 500; in other embodiments, the cooling plate 210 can also be a rectangular structure, and the number of side panels 400 can be three or four. Of course, the cooling plate 210 can also be other shapes such as a pentagon or hexagon. In this case, the number of side panels 400 can be increased or decreased accordingly.

[0070] In some embodiments, as shown in Figures 1 to 7, the above-mentioned gap includes a first gap 101 and a second gap 111. The cooling portion 221 is arranged in the first gap 101, and the second gap 111 and between the battery cell group 100 and the side plate 400 are filled with adhesive to achieve fixation between the battery cells 110 and the battery cells 110, as well as fixation between the battery cells 110 and the side plate 400, thereby achieving the effect of improving the overall structural strength of the battery unit.

[0071] In some embodiments, the adhesive is also filled between the sidewall of the battery cell 110 and the contoured surface 2212 and between the battery cell 110 and the bracket 300 to improve the overall structural strength of the battery unit.

[0072] In some embodiments, the adhesive filled in the second gap 111 and between the battery cell group 100 and the side plate 400 is a thermally conductive adhesive, which can achieve a heat conduction effect while fixing the battery cell 110, thereby improving the heat dissipation effect of the battery cell 110.

[0073] This embodiment also provides a battery pack, which has high production efficiency and can cool the battery cells 110 more efficiently during the charging and discharging process.

[0074] Illustratively, the battery pack includes a battery management system (BMS) 700 and the battery cells in some of the above-mentioned embodiments. The BMS 700 is electrically connected to the above-mentioned battery cell group 100 to monitor data such as the voltage and temperature of the battery cell group 100 during the charging and discharging process. The battery pack adopts the battery cells in some of the above-mentioned embodiments, which has high production efficiency and can cool the battery cells 110 more efficiently during the charging and discharging process, providing strong protection for the safety of use and the service life of the battery pack.

[0075] Example 2

[0076] This embodiment provides a battery cell. The following mainly describes the differences between this embodiment and the first embodiment, and the similarities are not repeated here.

[0077] As shown in Figure 8, there is no cavity structure in the cooling part 221 and the connecting part 222, that is, the cooling part 221 and the connecting part 222 are both solid structures, and the cooling part 221 and the connecting part 222 are both heat-conducting elements. For example, the cooling part 221 and the connecting part 222 can be made of materials with heat-conducting properties such as copper, aluminum or thermally conductive glue. The connecting part 222 is arranged in the fourth cavity 212 and extends into the first cavity 211, so that the connecting part 222 is immersed in the refrigerant in the first cavity 211, so as to realize the heat-conducting connection between the cooling part 221 and the refrigerant through the connecting part 222. The cooling plate 210 is equipped with an inlet pipe 610 and a liquid outlet pipe 620 for the inlet and outlet of the refrigerant. Therefore, after the cooling part 221 absorbs the heat of the battery cell 110, the heat is transferred to the refrigerant in the cooling plate 210 through the connecting part 222. The refrigerant enters the external cooling system through the liquid outlet pipe 620 to take away the heat absorbed by the cooling part 221.

[0078] If the connecting part 222 extending into the first cavity 211 is not immersed in the refrigerant in the first cavity 211, the heat absorbed by the cooling part 221 can also be transferred to the refrigerant through the connecting part 222, but the heat transfer efficiency between the connecting part 222 and the refrigerant is lower than the heat transfer efficiency when the connecting part 222 is immersed in the refrigerant.

Claims

1. A battery cell, comprising: A battery cell group (100), the battery cell group (100) comprising a plurality of battery cells (110), the plurality of battery cells (110) being arranged in sequence, a gap being provided between two or more adjacent battery cells (110), and the number of the gaps being multiple; A cooling component comprises a cooling plate (210) and a plurality of cooling columns (220), a refrigerant flows in the cooling plate (210), the cooling plate (210) is located at the end of the battery cell (110), the plurality of cooling columns (220) are respectively arranged in the plurality of gaps, and the cooling columns (220) are arranged to cool the side walls of the battery cell (110).

2. The battery cell according to claim 1, wherein: The cooling column (220) comprises a cooling portion (221) and a connecting portion (222), the cooling portion (221) being connected to the connecting portion (222), the cooling portion (221) being located in the gap, and the cooling portion (221) being configured to cool the side wall of the battery cell (110), and the connecting portion (222) being connected to the cooling plate (210).

3. The battery cell according to claim 2, wherein: The cooling part (221) and the connecting part (222) are both heat-conducting elements; the connecting part (222) is disposed through the cooling plate (210); and the cooling part (221) is heat-conductingly connected to the refrigerant via the connecting part (222).

4. The battery cell according to claim 2, wherein: The cooling plate (210) includes a first cavity (211), the cooling part (221) is a heat-conducting element, and the cooling part (221) includes a second cavity, the connecting part (222) includes a third cavity, the second cavity is connected to the first cavity (211) through the third cavity, and the refrigerant flows in the first cavity (211), the second cavity and the third cavity.

5. The battery cell according to claim 2, wherein: The cooling plate (210) comprises a first cavity (211) and a fourth cavity (212), the refrigerant flows in the first cavity (211), the connecting portion (222) is penetrated in the fourth cavity (212), and the fourth cavity (212) is filled with glue.

6. The battery unit according to any one of claims 1-5, further comprising a bracket (300), wherein the bracket (300) is disposed on the cooling plate (210), wherein a mounting hole (310) is provided on the bracket (300), and the battery cell (110) is inserted into the mounting hole (310).

7. The battery cell according to claim 6, wherein: A pressure relief groove (320) is provided on one side of the bracket (300) facing the cooling plate (210); the pressure relief groove (320) cooperates with the cooling plate (210) to form a pressure relief cavity (321); and the pressure relief groove (320) is connected to the mounting hole (310); the battery cell (110) includes a pressure relief valve, and the pressure relief valve is located in the mounting hole (310).

8. The battery cell according to claim 7, wherein: The pressure relief groove (320) is a through groove or a semi-through groove.

9. The battery cell according to any one of claims 1 to 5, wherein: The outer wall of the cooling column (220) comprises a contoured surface (2212), the contoured surface (2212) is adapted to the outer shape of the battery core (110), and the contoured surface (2212) is in close contact with the outer wall of the battery core (110).

10. The battery cell according to claim 9, wherein: The number of the contoured surfaces (2212) is equal to and corresponds to the number of the battery cells (110) forming the gap.

11. The battery cell according to any one of claims 1-5, further comprising at least two side plates (400), at least two of the side plates (400) corresponding one-to-one to and connected to at least two side walls of the cooling plate (210), and at least two of the side plates (400) cooperate with the cooling plate (210) to form a box body (500), and the battery cell group (100) and the plurality of cooling columns (220) are all arranged in the box body (500).

12. The battery cell according to claim 11, wherein: The gap comprises a first gap (101) and a second gap (111); the cooling column (220) is arranged in the first gap (101); and the second gap (111) and between the battery cell group (100) and the side plate (400) are filled with adhesive.

13. A battery pack, comprising a battery management system (700) and a battery unit according to any one of claims 1 to 12, wherein the battery management system (700) is electrically connected to the battery cell group (100).

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