Battery cell and battery pack

Abstract

The utility model relates to battery technology field discloses a kind of battery monomer and battery package, battery monomer includes: shell, cooling pipeline and electrode assembly, the inside of shell is equipped with accommodating cavity, shell has the first wall and the second wall opposite along height direction;Cooling pipeline is inserted in accommodating cavity along height direction, cooling pipeline includes liquid inlet pipe section and liquid outlet pipe section, and the transition section between connecting liquid inlet pipe section and liquid outlet pipe section;Electrode assembly is installed in accommodating cavity, electrode assembly has cavity, cooling pipeline is located in cavity and is connected with electrode assembly;Liquid inlet pipe section is equipped with liquid inlet end in the side away from transition section, liquid outlet pipe section is equipped with liquid outlet end in the side away from transition section, liquid inlet end and liquid outlet end are communicated by transition section, the first wall or second wall is equipped with through-hole, liquid inlet end, liquid outlet end is respectively connected with the hole wall of through-hole.Cooling pipeline's three-section heat exchange path is longer, and compactness is high, improve the heat dissipation efficiency of battery monomer, guarantee the energy density of battery.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery cell and battery pack. Background Technology

[0002] With the rapid development of new energy vehicle technology, consumers are placing higher demands on battery performance. As the power source for new energy vehicles, the stability, reliability, and safety of power batteries are of paramount importance.

[0003] In practical applications, battery packs typically contain multiple cells, cooled by air or liquid cooling plates to prevent overheating during operation. However, the low integration of cells and cooling systems within the battery pack hinders further improvements in energy density. Subsequently, a novel battery cell design emerged, comprising an aluminum-plastic film, a bare cell, and a casing arranged from the inside out. Both the aluminum-plastic film and the casing are cylindrical, with the bare cell positioned between them. The inner surface of the aluminum-plastic film forms cooling channels. This design achieves more efficient heat transfer as heat is introduced and dissipated from within the battery cell.

[0004] However, the cooling channels in existing battery cells are straight-through, and the heat exchange path along the height of the cell is short, which cannot meet the performance requirements of heat dissipation efficiency and energy density of battery cells. Utility Model Content

[0005] The technical problem this invention aims to solve is that the existing cooling channels in battery cells are straight-through, resulting in a short heat exchange path along the cell height, which fails to meet the performance requirements of heat dissipation efficiency and energy density of battery cells.

[0006] To solve the above-mentioned technical problems, this utility model provides a technical solution for a single battery cell:

[0007] A single battery cell, having a height orientation, includes:

[0008] A housing, the interior of which is provided with a receiving cavity, and the housing having a first wall and a second wall opposite to each other along the height direction;

[0009] A cooling pipe is inserted into the accommodating cavity along the height direction. The cooling pipe includes an inlet pipe section and an outlet pipe section, as well as a transition section connecting the inlet pipe section and the outlet pipe section.

[0010] An electrode assembly is installed within the accommodating cavity, the electrode assembly having a cavity, and a cooling pipe located within the cavity and connected to the electrode assembly.

[0011] Along the height direction, the liquid inlet pipe section has a liquid inlet end on the side away from the transition section, and the liquid outlet pipe section has a liquid outlet end on the side away from the transition section. The liquid inlet end and the liquid outlet end are connected through the transition section. A through hole is opened in the first wall or the second wall. The through hole has a hole wall, and the liquid inlet end and the liquid outlet end are respectively connected to the hole wall of the through hole.

[0012] Furthermore, the battery cell also has a length direction and a width direction, the height direction, the length direction and the width direction intersect each other, the liquid inlet pipe section and the liquid outlet pipe section both extend along the height direction, and the liquid inlet pipe section and the liquid outlet pipe section are arranged at intervals in the length direction.

[0013] Furthermore, the transition section is integrally formed with the liquid inlet pipe section and the liquid outlet pipe section to form a U-shaped channel structure.

[0014] Furthermore, both the inlet and outlet are located on the first wall, and the transition section is connected to the side of the second wall facing the accommodating cavity.

[0015] Furthermore, the liquid inlet and the liquid outlet are respectively located at the middle of the first wall in the length direction, and the first wall is also provided with electrode terminals, which are arranged at intervals from the liquid inlet and the liquid outlet.

[0016] Furthermore, the cavity is provided with a plurality of cooling pipes spaced apart in pairs, and the plurality of cooling pipes are spaced apart along the length direction or the width direction.

[0017] Furthermore, there are two electrode assemblies arranged side by side in the width direction, and each electrode assembly has at least one cooling pipe in its cavity.

[0018] Furthermore, the second wall is provided with an explosion-proof valve, and along the height direction, the orthographic projection of the cooling pipe on the second wall is spaced apart from the explosion-proof valve.

[0019] Furthermore, the inlet end and the outlet end are respectively connected to the through hole; or, the inlet pipe section and the outlet pipe section pass through the through hole.

[0020] To solve the above-mentioned technical problems, this utility model provides a technical solution for a battery pack:

[0021] A battery pack, including a main housing and individual battery cells installed within the main housing;

[0022] The battery cell has a height orientation, including:

[0023] A housing, the interior of which is provided with a receiving cavity, and the housing having a first wall and a second wall opposite to each other along the height direction;

[0024] A cooling pipe is inserted into the accommodating cavity along the height direction. The cooling pipe includes an inlet pipe section and an outlet pipe section, as well as a transition section connecting the inlet pipe section and the outlet pipe section.

[0025] An electrode assembly is installed within the accommodating cavity, the electrode assembly having a cavity, and a cooling pipe located within the cavity and connected to the electrode assembly.

[0026] Along the height direction, the liquid inlet pipe section has a liquid inlet end on the side away from the transition section, and the liquid outlet pipe section has a liquid outlet end on the side away from the transition section. The liquid inlet end and the liquid outlet end are connected through the transition section. A through hole is opened in the first wall or the second wall. The through hole has a hole wall, and the liquid inlet end and the liquid outlet end are respectively connected to the hole wall of the through hole.

[0027] Furthermore, the battery cell also has a length direction and a width direction, the height direction, the length direction and the width direction intersect each other, the liquid inlet pipe section and the liquid outlet pipe section both extend along the height direction, and the liquid inlet pipe section and the liquid outlet pipe section are arranged at intervals in the length direction.

[0028] Furthermore, the transition section is integrally formed with the liquid inlet pipe section and the liquid outlet pipe section to form a U-shaped channel structure.

[0029] Furthermore, both the inlet and outlet are located on the first wall, and the transition section is connected to the side of the second wall facing the accommodating cavity.

[0030] Furthermore, the liquid inlet and the liquid outlet are respectively located at the middle of the first wall in the length direction, and the first wall is also provided with electrode terminals, which are arranged at intervals from the liquid inlet and the liquid outlet.

[0031] Furthermore, the cavity is provided with a plurality of cooling pipes spaced apart in pairs, and the plurality of cooling pipes are spaced apart along the length direction or the width direction.

[0032] Furthermore, there are two electrode assemblies arranged side by side in the width direction, and each electrode assembly has at least one cooling pipe in its cavity.

[0033] Furthermore, the second wall is provided with an explosion-proof valve, and along the height direction, the orthographic projection of the cooling pipe on the second wall is spaced apart from the explosion-proof valve.

[0034] Furthermore, the inlet end and the outlet end are respectively connected to the through hole; or, the inlet pipe section and the outlet pipe section pass through the through hole.

[0035] Furthermore, it also includes a liquid supply branch and a liquid return branch, both of which are located on the side of the first wall away from the electrode assembly. Both the liquid supply branch and the liquid return branch have channels extending along the width direction. The channel of the liquid supply branch is connected to the liquid inlet end, and the channel of the liquid return branch is connected to the liquid outlet end.

[0036] Compared with existing technologies, the advantages of this battery cell and battery pack are as follows: The battery cell adopts a design consisting of a housing, cooling pipes, and electrode assemblies. The housing has an internal cavity into which the cooling pipes are inserted along the height direction. The battery assembly is installed within the cavity, and the electrode assembly has a cavity in which the cooling pipes are located and connected. In other words, the battery cell uses a built-in cooling pipe design, ensuring sufficient thermal contact between the cooling pipes and the electrode assembly, thus guaranteeing efficient heat dissipation within the battery cell through the cooling pipes.

[0037] The cooling pipeline includes an inlet pipe section and an outlet pipe section, as well as a transition section connecting the inlet and outlet pipe sections. The inlet pipe section has an inlet end on the side furthest from the transition section, and the outlet pipe section has an outlet end on the side furthest from the transition section. A through-hole is formed in the first or second wall, and the inlet and outlet ends are connected to the wall of the through-hole, respectively. The coolant flows sequentially through the inlet end, inlet pipe section, transition section, outlet pipe section, and outlet end. This three-section heat exchange path of the cooling pipeline is longer and more compact, improving the heat dissipation efficiency of the battery cells while ensuring the energy density of the battery. Attached Figure Description

[0038] Figure 1 This is a three-dimensional schematic diagram of a battery cell in an embodiment of this utility model;

[0039] Figure 2 This is a perspective view of a single battery cell in an embodiment of this utility model;

[0040] Figure 3 This is a cross-sectional schematic diagram of a battery cell in an embodiment of this utility model;

[0041] Figure 4 This is a schematic diagram showing the connection between the cooling pipe and the liquid inlet branch and the liquid outlet branch in an embodiment of this utility model;

[0042] Figure 5 This is a perspective view of a battery cell in another embodiment of the battery cell of this utility model;

[0043] Figure 6This is a three-dimensional schematic diagram of the battery pack in an embodiment of this utility model;

[0044] In the diagram: 1-Shell, 10-Cavity, 11-First wall, 12-Second wall, 13-Electrode terminal, 14-Explosion-proof valve, 15-Through hole, 2-Cooling pipe, 21-Inlet pipe section, 22-Outlet pipe, 23-Transition section, 24-Inlet end, 25-Outlet end, 3-Electrode assembly, 4-Main housing, 41-Supply branch, 42-Return branch, X-Length direction, Y-Width direction, Z-Height direction. Detailed Implementation

[0045] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0046] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" used to indicate the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0048] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0049] like Figures 1 to 4As shown, a battery cell according to an embodiment of the present invention has a height direction Z and includes: a housing 1, a cooling pipe 2 and an electrode assembly 3. The housing 1 has an internal accommodating cavity 10 and has a first wall 11 and a second wall 12 opposite to each other along the height direction Z. The cooling pipe 2 is inserted into the accommodating cavity 10 along the height direction Z. The cooling pipe 2 includes an inlet pipe section 21 and an outlet pipe section 22, as well as a transition section 23 connecting the inlet pipe section 21 and the outlet pipe section 22.

[0050] Electrode assembly 3 is installed in cavity 10. Electrode assembly 3 has cavity 30. Cooling pipe 2 is located in cavity 30 and connected to electrode assembly 3. Along the height direction Z, liquid inlet pipe section 21 has liquid inlet end 24 on the side away from transition section 23, and liquid outlet pipe section 22 has liquid outlet end 25 on the side away from transition section 23. Liquid inlet end 24 and liquid outlet end 25 are connected through transition section 23. A through hole 15 is opened in the first wall 11 or the second wall 12. The through hole 15 has hole wall. Liquid inlet end 24 and liquid outlet end 25 are connected to hole wall of through hole 15.

[0051] The battery cell adopts a design consisting of a housing 1, cooling pipes 2, and electrode assemblies 3. The housing 1 has an internal cavity 10, into which the cooling pipes 2 are inserted along the height direction Z. The battery assembly 3 is installed within the cavity 10, and the electrode assembly 3 has a cavity 30. The cooling pipes 2 are located within the cavity 30 and connected to the electrode assembly 3. In other words, the battery cell utilizes a built-in cooling pipe design, ensuring sufficient thermal contact between the cooling pipes 2 and the electrode assembly 3, thus guaranteeing efficient heat dissipation within the battery cell through the cooling pipes 2.

[0052] The cooling pipe 2 includes an inlet pipe section 21 and an outlet pipe section 22, as well as a transition section 23 connecting the inlet pipe section 21 and the outlet pipe section 22. The inlet pipe section 21 has an inlet end 24 on the side away from the transition section 23, and the outlet pipe section 22 has an outlet end 25 on the side away from the transition section 23. A through hole 15 is formed in the first wall 11 or the second wall 12, and the inlet end 24 and the outlet end 25 are respectively connected to the wall of the through hole 15. The coolant flows sequentially through the inlet end 23, the inlet pipe section 21, the transition section 23, the outlet pipe section 22, and the outlet end 25. The three-section heat exchange path of the cooling pipe 2 is longer and has a more compact structure, improving the heat dissipation efficiency of the battery cells while ensuring the energy density of the battery.

[0053] In this embodiment, the battery cell also has a length direction X and a width direction Y, and a height direction Z. The length direction X and the width direction Y intersect each other. The liquid inlet pipe section 21 and the liquid outlet pipe section 22 both extend along the height direction Z, and the liquid inlet pipe section 21 and the liquid outlet pipe section 22 are arranged at intervals in the length direction X. The battery cell is larger in the length direction X, which means that the electrode assembly 3 has serious heat accumulation in the length direction X. The liquid inlet pipe section 21 and the liquid outlet pipe section 22 are arranged at intervals in the length direction X, which can absorb the heat generated inside the electrode assembly 3 to the greatest extent.

[0054] As a further preferred embodiment, the transition section 23 is integrally formed with the inlet pipe section 21 and the outlet pipe section 22, respectively, to form a U-shaped channel structure. The flow channel of the U-shaped channel structure is more complete, which improves the smoothness of coolant flow and avoids the possibility of coolant leakage into the electrode assembly 3.

[0055] Specifically, the liquid inlet end 24 and the liquid outlet end 25 are both located on the first wall 11, and the transition section 23 is connected to the side of the second wall 12 facing the accommodating cavity 10. The liquid inlet pipe section 21 and the liquid outlet pipe section 22 extend fully into the accommodating cavity 10 along the height direction Z, increasing the contact area between the cooling pipe 2 and the electrode assembly 3.

[0056] Furthermore, the liquid inlet 24 and liquid outlet 25 are respectively located at the middle of the first wall 11 in the length direction X. The first wall 11 is also provided with electrode terminals 13, which are arranged at intervals with the liquid inlet 24 and liquid outlet 25. Because the heat is more concentrated in the middle of the electrode assembly 3 in the length direction X, the liquid inlet pipe section 21 and the liquid outlet pipe section 22 are both located in the middle of the accommodating cavity 10 in the length direction X, which can efficiently absorb and remove the internal heat of the battery cell, while providing sufficient space for the arrangement of the electrode terminals 13.

[0057] It should be mentioned that in this utility model, "the first wall 11 is in the middle of the length direction X" can be specifically understood as dividing the first wall 11 into three equal parts in the length direction X, resulting in a left part, a middle part and a right part, with the middle part located between the left and right parts.

[0058] To further improve the heat dissipation efficiency of the battery cells, a plurality of cooling pipes 2 spaced apart in pairs are provided in the cavity 30. The plurality of cooling pipes 2 are arranged at intervals along the length direction X or the width direction Y. In this embodiment, two electrode assemblies 3 are provided, and the two electrode assemblies 3 are arranged side by side in the width direction Y. Each electrode assembly 3 has at least one cooling pipe 2 in its cavity 30, ensuring that each electrode assembly 3 can meet the requirements of efficient heat dissipation.

[0059] In addition, the second wall 12 is equipped with an explosion-proof valve 14, such as Figure 2As shown, along the height direction Z, the two cooling pipes 2 are spaced apart from the explosion-proof valve 14 by their orthogonal projections on the second wall 12. Specifically, the explosion-proof valve 14 is located on the second wall 12 and between the two cooling pipes 2. This prevents the cooling pipes 2 from obstructing the explosion-proof valve 14 due to the transition section 23 between the explosion-proof valve 14 and the cooling pipe 2 being opposite each other in the height direction Z, thus ensuring the reliability of thermal runaway outward ejection.

[0060] To meet different usage requirements, the structure of the battery cell can be flexibly designed. In other embodiments, there are two electrode assemblies 3 and two cooling pipes 2, such as... Figure 5 As shown, two cooling pipes 2 are respectively located at the ends of the housing 1 along its length. Correspondingly, the liquid inlet and liquid outlet are respectively located at the ends of the first wall along its length. An explosion-proof valve is located on the first wall between the two cooling pipes 2, which can also meet the effective heat dissipation requirements of each electrode assembly 3, ensuring that it can be smoothly ejected outward in the event of thermal runaway.

[0061] As a further preferred embodiment, the inlet end 24 and the outlet end 25 are respectively connected to the through hole 15. Specifically: 1. The inlet pipe section 21 and the outlet pipe section 22 are respectively aligned and connected to the through hole 15 but do not penetrate the through hole 15; 2. The inlet pipe section 21 and the outlet pipe section 22 are respectively aligned and connected to the through hole 15 and penetrate the through hole 15. Alternatively, the inlet pipe section 21 and the outlet pipe section 22 are inserted through the through hole 15. Both of these configurations ensure that coolant can smoothly enter and exit the housing 1 through the inlet end 24 and the outlet end 25.

[0062] Specific embodiments of the battery pack of this utility model are as follows: Figure 6 As shown, the battery pack includes a main housing 4 and battery cells installed inside the main housing 4. The specific embodiments of the battery cells in the specific implementation of the battery cells of this utility model are the same, and will not be described again here.

[0063] As a further preferred embodiment, the battery pack also includes a liquid supply branch 41 and a liquid return branch 42. Both the liquid supply branch 41 and the liquid return branch 42 are located on the side of the first wall 11 away from the electrode assembly 3. Both the liquid supply branch 41 and the liquid return branch 42 have channels extending along the width direction Y. The channel of the liquid supply branch 41 communicates with the liquid inlet end 24, and the channel of the liquid return branch 42 communicates with the liquid outlet end 25. The channel of the liquid supply branch 41 communicates with the liquid inlet pipe section 21 of each battery cell, and the channel of the liquid outlet branch 42 communicates with the liquid outlet pipe section 22 of each battery cell, ensuring smooth liquid inflow and outflow for each battery cell in the entire battery pack.

[0064] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A single battery cell having a height orientation (Z), characterized in that, include: The housing (1) has an internal cavity (10) and a first wall (11) and a second wall (12) opposite each other along the height direction (Z). Cooling pipe (2), the cooling pipe (2) is inserted into the accommodating cavity (10) along the height direction (Z), the cooling pipe (2) includes an inlet pipe section (21) and an outlet pipe section (22), and a transition section (23) connecting the inlet pipe section (21) and the outlet pipe section (22). Electrode assembly (3), the electrode assembly (3) is installed in the accommodating cavity (10), the electrode assembly (3) has a cavity (30), the cooling pipe (2) is located in the cavity (30) and connected to the electrode assembly (3); Along the height direction (Z), the liquid inlet pipe section (21) is provided with a liquid inlet end (24) on the side away from the transition section (23), and the liquid outlet pipe section (22) is provided with a liquid outlet end (25) on the side away from the transition section (23). The liquid inlet end (24) and the liquid outlet end (25) are connected through the transition section (23). The first wall (11) or the second wall (12) is provided with a through hole (15). The through hole (15) has a hole wall. The liquid inlet end (24) and the liquid outlet end (25) are respectively connected to the hole wall of the through hole (15).

2. The battery cell according to claim 1, characterized in that, The battery cell also has a length direction (X) and a width direction (Y). The height direction (Z), the length direction (X) and the width direction (Y) intersect each other. The liquid inlet pipe section (21) and the liquid outlet pipe section (22) both extend along the height direction (Z), and the liquid inlet pipe section (21) and the liquid outlet pipe section (22) are arranged at intervals in the length direction (X).

3. The battery cell according to claim 1, characterized in that, The transition section (23) is integrally formed with the liquid inlet section (21) and the liquid outlet section (22) to form a U-shaped channel structure.

4. The battery cell according to claim 2, characterized in that, The liquid inlet (24) and the liquid outlet (25) are both located on the first wall (11), and the transition section (23) is connected to the second wall (12) on the side facing the accommodating cavity (10).

5. The battery cell according to claim 4, characterized in that, The liquid inlet (24) and the liquid outlet (25) are respectively located in the middle of the length direction (X) of the first wall (11). The first wall (11) is also provided with electrode terminals (13), which are arranged at intervals with the liquid inlet (24) and the liquid outlet (25).

6. The battery cell according to claim 2, characterized in that, The cavity (30) is provided with a plurality of cooling pipes (2) spaced apart in pairs, and the plurality of cooling pipes (2) are spaced apart along the length direction (X) or the width direction (Y).

7. The battery cell according to claim 2, characterized in that, Two electrode assemblies (3) are provided, and the two electrode assemblies (3) are arranged side by side in the width direction (Y). Each electrode assembly (3) has at least one cooling pipe (2) in its cavity (30).

8. The battery cell according to claim 1, characterized in that, The second wall (12) is provided with an explosion-proof valve (14), and along the height direction (Z), the orthogonal projection of the cooling pipe (2) on the second wall (12) is spaced from the explosion-proof valve (14).

9. The battery cell according to claim 1, characterized in that, The liquid inlet end (24) and the liquid outlet end (25) are respectively connected to the through hole (15); or, the liquid inlet pipe section (21) and the liquid outlet pipe section (22) are inserted through the through hole (15).

10. A battery pack, characterized in that, It includes a main housing (4) and a battery cell installed in the main housing (4), wherein the battery cell is the battery cell according to any one of claims 1 to 9.

11. The battery pack according to claim 10, characterized in that, It also includes a liquid supply branch (41) and a liquid return branch (42), both of which are located on the side of the first wall (11) away from the electrode assembly (3). Both the liquid supply branch (41) and the liquid return branch (42) have channels extending along the width direction (Y). The channel of the liquid supply branch (41) is connected to the liquid inlet end (24), and the channel of the liquid return branch (42) is connected to the liquid outlet end (25).

Images