A battery cell, a battery pack, an electric vehicle

Abstract

The application relates to a battery monomer, which comprises a shell, the shell comprising a first end and a second end in a length direction, the first end and the second end having openings; a plate structure assembly for adjusting temperature; the plate structure assembly extending at least to the two ends in the length direction of the shell; the plate structure assembly being divided into two non-communicating cavities in the shell, the two ends of the cavities in the length direction having openings; a pole roll arranged in the cavities, and the pole rolls in the adjacent two cavities being electrically connected; a positive electrode end cover arranged at one opening of the cavity, the positive electrode end cover being electrically connected with the positive electrode tabs of the pole roll in the cavity; and a negative electrode end cover arranged at the other opening of the cavity, the negative electrode end cover being electrically connected with the negative electrode tabs of the pole roll in the cavity. The battery monomer provided by the application is easier to install and is beneficial to heat management compared with the existing battery monomer with only one pole roll in the interior.

Description

Technical Field

[0001] This application relates to the field of power battery technology, and more specifically, to a battery cell, a battery pack, and an electric vehicle. Background Technology

[0002] For pure electric vehicles, a pressing need is to be able to recharge their energy in a very short time, just like gasoline vehicles. Therefore, fast charging and supercharging technologies, represented by 800V high-voltage battery systems, are key areas of research and development for major automakers.

[0003] Currently, the voltage platform of power batteries, whether lithium iron phosphate cells or nickel-cobalt-manganese ternary cells, is generally between 3.1V and 3.8V. Taking lithium iron phosphate cells as an example, the voltage of a single cell is 3.1V. To achieve a high voltage of 800V, 258 cells would need to be connected in series. This large number of cells limits their size. Generally, the height of a cell is constrained by the overall battery pack height, so it is fixed, typically between 90mm and 120mm. However, the length and width of the cell are adjustable. Therefore, current technology often uses adjusting the length and width of the cell to ensure its capacity meets usage requirements.

[0004] Battery cells, exemplified by CATL, are wider, shorter, and thicker overall, making them less suitable for thermal management. Blade batteries, exemplified by BYD, have thinner, longer cells, which are better for thermal management; however, their thinness makes assembly into battery packs more difficult. Summary of the Invention

[0005] The purpose of this application is to provide a battery cell, battery pack, and electric vehicle that are easy to install and have good temperature regulation, which is achieved by the following technical solution.

[0006] A battery cell includes a housing, the housing having a first end and a second end located in a length direction, the first end and the second end having openings;

[0007] A plate-shaped structural assembly for regulating temperature; the plate-shaped structural assembly extends at least along the length direction of the housing to be flush with both ends of the housing along the length direction; the plate-shaped structural assembly divides the housing into two non-communicating cavities, each cavity having an opening at both ends along its length direction;

[0008] The electrode rolls are disposed in the cavity, and the electrode rolls in adjacent cavities are electrically connected.

[0009] A positive terminal cap is provided at one end of the cavity opening, and the positive terminal cap is electrically connected to the positive terminal tab of the electrode roll inside the cavity.

[0010] Additionally, a negative terminal cap is disposed at the opening at the other end of the cavity, and the negative terminal cap is electrically connected to the negative terminal tab of the electrode coil inside the cavity.

[0011] By incorporating multiple cavities within the casing and housing the electrode rolls within these cavities, the width of the battery cell can be increased, thus increasing its thickness, compared to existing battery cells with only one electrode roll. This makes battery cell installation easier. Furthermore, the presence of a plate-like structure between the two cavities helps regulate the temperature of the electrode rolls positioned on either side of the plate-like structure, improving thermal management.

[0012] Furthermore, the thickness of the electrode roll is in the range of 5mm to 30mm.

[0013] When the electrode roll is within the aforementioned thickness range, the internal temperature regulation of the battery cell is more effective. The technical solution provided in this application also solves the problem of difficult battery cell installation when the electrode roll thickness is relatively thin.

[0014] Furthermore, the plate-like structure component includes,

[0015] cavity,

[0016] A first vertical plate and a second vertical plate are arranged side by side on both sides of the cavity, and the upper and lower sides of the first vertical plate and the second vertical plate are in contact with the shell.

[0017] The first liquid-cooled plate end cap and the second liquid-cooled plate end cap are located at both ends of the cavity along its length. One side of the first liquid-cooled plate end cap and one side of the second liquid-cooled plate end cap are both connected to the first vertical plate. The other side of the first liquid-cooled plate end cap and the other side of the second liquid-cooled plate end cap are both connected to the second vertical plate.

[0018] The plate-shaped structure assembly has a liquid inlet and a liquid outlet, both of which are connected to the cavity.

[0019] In the above-mentioned plate-shaped structure assembly, the upper ends of the first vertical plate and the second vertical plate are in contact with the shell, which can improve the stability of the plate-shaped structure assembly inside the shell. By setting the liquid inlet and liquid outlet, the coolant can flow into / out of the plate-shaped structure assembly.

[0020] Furthermore, the plate-shaped structure assembly also includes fins, the two sides of which are connected to the first vertical plate and the second vertical plate respectively, and are inclined relative to the first vertical plate and the second vertical plate; the fins divide the cavity into flow channels, and the liquid inlet and the liquid outlet are connected through the flow channels.

[0021] By dividing the plate-like structure into flow channels, the flow channels can evenly distribute the coolant, making the temperature inside the battery more uniform. The fins are inclined relative to the vertical plate, making them easier to deform. When the cavities on both sides of the plate-like structure expand, the plate-like structure deforms under stress, reducing its thickness and thus minimizing changes in the shape of the battery cell.

[0022] Furthermore, the first vertical plate, the second vertical plate, and the fins are all metal structural components.

[0023] Metal structural components possess a certain strength and elasticity, and can rebound after being deformed under stress.

[0024] Furthermore, in the height direction, the first vertical plate includes an upper part and a lower part, the height dimension of the upper part of the first vertical plate is not less than 15mm, and both ends of the upper part of the first vertical plate protrude from the edges of both ends of the shell in the length direction by at least 15mm.

[0025] The outer dimensions of the second vertical plate are the same as those of the first vertical plate;

[0026] Both the liquid inlet and the liquid outlet are located between the upper part of the first vertical plate and the upper part of the second vertical plate, and are located outside the housing.

[0027] Both ends of the upper part protrude at least 15mm beyond the edges of the shell along its length, allowing space for the inlet and outlet to be connected to other pipelines.

[0028] Furthermore, both ends of the lower part of the first vertical plate protrude at least 3mm beyond the edges of both ends of the shell in the length direction, and the positive end cap and the negative end cap disposed on one side of the first vertical plate are both welded to the first vertical plate; the positive end cap and the negative end cap disposed on one side of the second vertical plate are both welded to the second vertical plate.

[0029] By making the lower ends of the first and second vertical plates protrude at least 3 mm beyond the edges of the housing, positions for welding the positive and negative end caps are provided, facilitating welding. When the first and second liquid-cooled plate end caps are connected to the first and second vertical plates by welding, the welds used to connect the first and second liquid-cooled plate end caps to the plate-shaped structure assembly are prevented from overlapping with the welds used to connect the positive and negative end caps to the plate-shaped structure assembly, thus avoiding any impact on the internal sealing of the cavity.

[0030] Furthermore, the electrode rolls within the housing are connected in series, and the polarities of adjacent electrode rolls are different at the first end of the housing; the positive end cap located at the first end of the housing and the negative end cap located at the first end of the housing are electrically connected by an aluminum busbar, and the aluminum busbar is spaced apart from the plate-shaped structure assembly in both the length and height directions of the housing.

[0031] By spacing the aluminum busbar and the plate structure assembly in both length and height directions, interference between them can be avoided during installation. When the plate structure assembly is a metal component, the housing can be prevented from being directly connected to the positive or negative electrode, thus avoiding the risk of leakage and short circuit.

[0032] Furthermore, the electrode rolls within the housing are connected in parallel, with the positive electrode tabs of the electrode rolls all located at the first end of the housing; and the negative electrode tabs of the electrode rolls all located at the second end of the housing.

[0033] The positive end cap located at the first end of the housing is electrically connected via a first aluminum busbar;

[0034] The negative end cap located at the second end of the housing is electrically connected via a second aluminum busbar;

[0035] In the length and height directions of the housing, the plate-shaped structural components are spaced apart from the first aluminum busbar and the second aluminum busbar.

[0036] The second objective of this application is to provide a battery pack that facilitates cell installation and thermal management of the cells, achieved through the following technical solution:

[0037] A battery pack comprising the aforementioned battery cells.

[0038] The third objective of this application is to provide an electric vehicle that facilitates battery cell installation and thermal management of the battery cells, achieved through the following technical solution:

[0039] An electric vehicle having the aforementioned battery cell or battery pack.

[0040] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0041] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 This is one of the structural schematic diagrams of a battery cell provided in the first embodiment of this application;

[0043] Figure 2 One of the schematic diagrams showing the series connection of electrode rolls within a single battery cell according to the first embodiment of this application;

[0044] Figure 3 for Figure 2 An exploded view from another perspective;

[0045] Figure 4 This is a schematic diagram of the structure of the inner fins of a battery cell provided in the first embodiment of this application.

[0046] Icons: 10-Shell; 21-First cavity; 22-Second cavity; 31-First vertical plate; 32-Second vertical plate; 41-First liquid cooling plate end cap; 42-Second liquid cooling plate end cap; 51-Liquid inlet; 52-Liquid outlet; 61-Positive end cap; 62-Negative end cap; 70-Fin; 80-Aluminum busbar; 91-First electrode coil; 92-Second electrode coil. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0048] In the description of this application, it should be noted that the terms "inner," "outer," "horizontal," "vertical," "upper," and "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element 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 application. In addition, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0049] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0050] In the process of researching the prior art, the inventors of this application discovered that the battery cells commonly used in electric vehicles currently come in two main forms: one is the battery cell represented by CATL, which is shorter in length and wider in width (reflected in its greater thickness); the other is the blade battery represented by BYD, which is longer in length and narrower in width (reflected in its thinner thickness). The former, due to its greater thickness, is easier to install but less convenient for thermal management; the latter, due to its thinner thickness, is easier to thermally manage but less convenient to install. In this application, the width dimension refers to the thickness dimension. The length directions of the casing and cavity mentioned below refer to the same direction, only the objects involved differ.

[0051] The inventors of this application have discovered that the thickness of a battery cell largely depends on the size of the electrode roll inside the cell. The electrode roll is a component with structures such as a positive electrode, a negative electrode, and a separator. The charging and discharging of the battery cell is achieved through a series of chemical reactions, and thermal management of the battery cell mainly involves controlling the temperature of the electrode roll inside the cell.

[0052] Based on this, the inventors of this application propose a battery cell that facilitates thermal management and installation, including a housing 10, wherein the housing 10 is located in the length direction (i.e., Figures 1 to 3 The housing 10 (pointed to by arrow A) has openings at both ends and includes a plate-like structural assembly for temperature regulation. The plate-like structural assembly extends at least along the length of the housing 10 to be flush with the length of the housing 10, and divides the housing 10 into two non-communicating cavities. These cavities are used to house the electrode rolls, and each cavity is independent of the others, providing space for the electrode rolls to operate normally. Since the plate-like structural assembly extends along the length of the housing 10, the ends of the cavities along the length of the housing 10 should also have openings.

[0053] As can be seen from the above technical solution, the battery cell provided in this application can include at least two electrode rolls. Compared with the existing BYD blade battery, the thickness of the electrode rolls in this application can be the same as that of the electrode rolls in BYD's blade battery, which facilitates thermal management. The length is only half that of the blade battery. By setting the two electrode rolls in the casing and connecting them in series, it can output the same voltage and hold the same amount of power as the existing blade battery. However, due to the increased number of electrode rolls inside the battery cell, when using the same installation method as the existing blade battery, the battery cell provided in this application must be thicker than the existing blade battery, making the battery cell easier to install. A plate-like structure component for temperature regulation is provided between the two electrode rolls in this application, and the thicker battery cell in this application will not hinder thermal management.

[0054] Similarly, the battery cell provided in this application has a small increase in thickness compared to existing cells represented by CATL, but the temperature regulation effect can be significantly improved.

[0055] To ensure effective temperature regulation, the thickness of the electrode roll used in this application can be controlled within the range of 5mm to 30mm.

[0056] In one embodiment provided in this application, the plate-shaped structure assembly uses liquid for thermal management. The plate-shaped structure assembly includes a liquid inlet 51 and a liquid outlet 52, as well as a flow channel disposed inside the plate-shaped structure assembly, which connects the liquid inlet 51 and the liquid outlet 52. The liquid inlet 51 and the liquid outlet 52 can be located at the same end of the plate-shaped structure assembly along its length, or at different ends of the plate-shaped structure assembly along its length.

[0057] In some embodiments, the plate-like structural assembly can be a separately manufactured structural component capable of independent liquid circulation. The plate-like structural assembly may include multiple plates forming a cavity within the assembly. Inlet ports 51 and outlet ports 52 are provided on the surfaces of some plates, both communicating with the cavity inside the assembly. That is, by injecting liquid into the inlet port 51, liquid will flow out from the outlet port 52. After the plate-like structural assembly is manufactured separately, it is then welded to the inner side of the housing 10.

[0058] In other implementations, such as Figures 1 to 4 As shown, the plate-shaped structure assembly includes a first vertical plate 31, a second vertical plate 32, a first liquid-cooled plate end cap 41, and a second liquid-cooled plate end cap 42. The first vertical plate 31, the second vertical plate 32, the first liquid-cooled plate end cap 41, and the second liquid-cooled plate end cap 42, together with the housing 10, form a cavity in the plate-shaped structure assembly for containing liquid, having a liquid inlet 51 and a liquid outlet 52.

[0059] Specifically, the upper sides of the first vertical plate 31 and the second vertical plate 32 are connected to the top of the inner surface of the housing 10, and the lower sides of the first vertical plate 31 and the second vertical plate 32 are connected to the bottom of the inner surface of the housing 10, so as to separate a cavity for accommodating the electrode roll inside the housing 10. The first liquid cooling plate end cap 41 is located at the first end in the length direction of the plate structure assembly, and its two opposite sides are connected to the first vertical plate 31 and the second vertical plate 32 respectively, and the other two opposite sides are connected to the housing 10; the first liquid cooling plate end cap 41 seals the opening formed between the first vertical plate 31 and the second vertical plate 32 at the first end of the plate structure assembly, and the liquid inlet 51 is provided on the first liquid cooling plate end cap 41; or only one side of the first liquid cooling plate end cap 41 is connected to the housing 10, so that the first liquid cooling plate end cap 41 does not completely block the opening formed between the first vertical plate 31 and the second vertical plate 32 at the first end of the plate structure assembly, and a reserved opening is provided as the liquid inlet 51. The second liquid-cooled plate end cap 42 is located at the second end of the plate-shaped structure assembly along its length. Two opposite sides of the end cap are connected to the first vertical plate 31 and the second vertical plate 32, respectively, while the other two opposite sides are connected to the housing 10. The second liquid-cooled plate end cap 42 seals the opening formed between the first vertical plate 31 and the second vertical plate 32 at the second end of the plate-shaped structure assembly. A liquid outlet 52 is located on the second liquid-cooled plate end cap 42. Alternatively, only one side of the second liquid-cooled plate end cap 42 is connected to the housing 10, so that the second liquid-cooled plate end cap 42 does not completely block the opening formed between the first vertical plate 31 and the second vertical plate 32 at the second end of the plate-shaped structure assembly, leaving a portion for the liquid outlet 52. In the embodiments provided in this application, both the first vertical plate 31 and the second vertical plate 32 are metal structural components, such as aluminum structural components. To ensure the reliability of the connection and the airtightness of the cavity after connection, the first liquid-cooled plate end cap 41 and the second liquid-cooled plate end cap 42 can be installed by welding.

[0060] In the embodiments provided in this application, the cavity inside the plate-shaped structure assembly is provided with fins 70. The fins 70 divide the cavity into flow channels connecting the liquid inlet 51 and the liquid outlet 52. By reasonably arranging the flow channels, the plate-shaped structure assembly can better regulate the temperature. Preferably, the first vertical plate 31 and the second vertical plate 32 are arranged parallel to each other, and the fins 70 are arranged at an angle relative to the first vertical plate 31 within the plate-shaped structure assembly. After the first vertical plate 31 and the second vertical plate 32 are compressed, the thickness of the plate-shaped structure assembly can be reduced, giving the plate-shaped structure assembly the function of absorbing deformation. When the electrode rolls expand during charging or under other conditions, the plate-shaped structure assembly located between the two electrode rolls is compressed. Through the deformation of the reduced thickness of the plate-shaped structure assembly, the change in the shape of the battery cell can be reduced. Further, as Figure 4 As shown, the fins 70 forming the flow channel can be arranged in parallel to obtain a flow channel with a parallelogram cross-section. The parallelogram has a weak resistance to deformation, which enables the plate structure component to have a better ability to absorb deformation.

[0061] In some embodiments of this application, to facilitate connection of the plate-like structure assembly with other pipelines, the plate-like structure assembly further has protrusions. These protrusions are located at both ends along the length of the plate-like structure assembly and outside the housing 10. The protrusions extend along both the length and height directions (i.e.,...) Figures 1 to 3 The dimensions of all protrusions (in the direction indicated by the middle arrow C) are not less than 15mm, and the dimension of the protrusion in the height direction is smaller than the dimension of the housing 10 in the height direction. Specifically, the first vertical plate 31 and the second vertical plate 32 have the same external dimensions, and the two ends of the first vertical plate 31 and the second vertical plate 32 are aligned in the length direction. Taking the first vertical plate 31 as an example, the first vertical plate 31 includes an upper part and a lower part. The dimension of the upper part in the height direction is not less than 15mm and smaller than the dimension of the housing 10 in the height direction. Both ends of the upper part of the first vertical plate 31 in the length direction extend at least 15mm beyond the housing 10. The upper part of the first vertical plate 31, the upper part of the second vertical plate 32, the first liquid cooling plate end cap 41, and the second liquid cooling plate end cap 42 constitute the protrusions of the plate-shaped structure assembly.

[0062] In the battery cell provided in this application, a positive terminal cover 61 is provided at one end of the cavity along its length, and a negative terminal cover 62 is provided at the other end. The positive terminal cover 61 has a positive terminal post, and the negative terminal cover 62 has a negative terminal post; the positive terminal post is electrically connected to the positive terminal tab of the electrode roll, and the negative terminal post is electrically connected to the negative terminal tab of the electrode roll. Both the positive terminal cover 61 and the negative terminal cover 62 are fixedly connected to the housing 10 by welding. In addition, since one side wall of the cavity is a plate-shaped structure assembly, both the positive terminal cover 61 and the negative terminal cover 62 have one side that needs to be welded to the plate-shaped structure assembly.

[0063] In some embodiments, the plate-shaped structure assembly includes a first liquid-cooled plate end cap 41 and a second liquid-cooled plate end cap 42, which are welded to both the first vertical plate 31 and the second vertical plate 32 in the longitudinal direction. During the welding process, the weld seam generated when welding the first liquid-cooled plate end cap 41 and the second liquid-cooled plate end cap 42 may overlap with the weld seam generated when welding the positive end cap 61 and the negative end cap 62. The sealing performance of the overlapping weld seam area is poor, affecting the airtightness of the cavity and causing the electrolyte in the cavity to leak from the weld seam. Therefore, in order to avoid electrolyte leakage in the cell, the lower parts of the first vertical plate 31 and the lower parts of the second vertical plate 32 can be extended from both ends of the housing 10 by at least 3 mm in the longitudinal direction. This allows the first liquid-cooled plate end cap 41 and the second liquid-cooled plate end cap 42 to be welded to the edges of the first vertical plate 31 and the second vertical plate 32, and the positive end cap 61 and the negative end cap 62 to be welded to the sides of the first vertical plate 31 and the second vertical plate 32, thus avoiding overlap between the weld seams.

[0064] In the embodiments described above in this application, thermal management of the battery cell is achieved by introducing liquid into the plate-shaped structure assembly. In other embodiments, a resistance wire can also be provided in the plate-shaped structure assembly, and energizing the resistance wire can increase the internal temperature of the battery module.

[0065] In the battery cell provided in this application, the electrode rolls located in different cavities can be connected in series or in parallel.

[0066] The housing 10 includes a first end and a second end in the longitudinal direction. When different electrode rolls are connected in series, the electrode rolls in two adjacent cavities have different polarities at the first end of the housing 10. Accordingly, a positive end cap 61 for electrical connection with the positive electrode tab of one electrode roll and a negative end cap 62 for electrical connection with the negative electrode tab of another electrode roll are provided at the first end of the housing 10. The positive end cap 61 and the negative end cap 62 located at the first end of the housing 10 are electrically connected through an aluminum busbar 80, thereby realizing the series connection between two adjacent electrode rolls. When the battery cell provided in this application has two or more electrode rolls, those skilled in the art should know how to connect the electrode rolls in series.

[0067] When different electrode rolls are connected in parallel, the positive end caps 61 are located at the first end of the housing 10, and the negative end caps 62 are located at the second end of the housing 10. The positive end caps 61 at the first end of the housing 10 are connected by the first aluminum busbar, and the negative end caps 62 at the second end of the housing 10 are connected by the second aluminum busbar, so that the parallel connection between multiple electrode rolls in the battery cell can be realized.

[0068] Since the first vertical plate 31 and the second vertical plate 32 in this application are both metal structural components, the housing 10 is also mostly made of metal in actual production. The connection between the housing 10 and the first vertical plate 31 and the second vertical plate 32 can achieve electrical conductivity. In order to prevent leakage and short circuits, it should be ensured that there is a gap between the aluminum busbar 80 and the plate structure assembly to avoid the presence of a path between the aluminum busbar 80 and the plate structure assembly.

[0069] This application also provides a battery pack, including a battery module composed of battery cells obtained using the embodiments of this application. In order to further improve the temperature regulation effect, a liquid cooling plate or other device for regulating the temperature of the battery module is also provided.

[0070] This application also provides an electric vehicle, including a power unit driven by a battery cell obtained using the embodiments of this application, or including a battery pack obtained using the embodiments of this application.

[0071] Example 1

[0072] This embodiment provides a single battery cell, such as Figures 1 to 4As shown, the device includes a housing 10, within which are arranged a first vertical plate 31 and a second vertical plate 32 that are parallel to each other. The first vertical plate 31 and the second vertical plate 32 have the same external dimensions and their ends are aligned along their length (in the direction indicated by arrow A in the figure). Both the first vertical plate 31 and the second vertical plate 32 extend along their length, with both ends of the first vertical plate 31 and the second vertical plate 32 extending out of the housing 10. The first vertical plate 31 divides the housing 10 into a first cavity 21, and the second vertical plate 32 divides the housing 10 into a second cavity 22. The first cavity 21 and the second cavity 22 are arranged along their width (in the direction indicated by arrow B in the figure), which is also the thickness direction of the battery cell.

[0073] The first vertical plate 31 can be divided into an upper part and a lower part. The upper part of the first vertical plate 31 has a height dimension of 20mm (in the direction indicated by arrow C in the figure). The upper part of the first vertical plate 31 extends out of the housing 10 at both ends in the length direction, and the lower part of the first vertical plate 31 also extends out of the housing 10 at both ends in the length direction.

[0074] One end of the first vertical plate 31 and the second vertical plate 32 in the length direction are both welded to the end cap 41 of the first liquid cooling plate, and the other end of the first vertical plate 31 and the second vertical plate 32 in the length direction are both welded to the end cap 42 of the second liquid cooling plate.

[0075] like Figure 1 , Figure 3 and Figure 4 As shown, the first liquid cooling plate end cap 41 is connected to the first vertical plate 31 on one side in the width direction and to the second vertical plate 32 on the other side. After the first liquid cooling plate end cap 41 is connected to the first vertical plate 31 and the second vertical plate 32, the upper side of the first liquid cooling plate end cap 41, the upper side of the first vertical plate 31, one upper side of the housing 10, and the upper side of the second vertical plate 32 form the liquid inlet 51 at the top of the battery cell. Similarly, the upper side of the second liquid cooling plate end cap 42, the upper side of the first vertical plate 31, the other upper side of the housing 10, and the upper side of the second vertical plate 32 form the liquid outlet 52 at the top of the battery cell. The lower ends of the first liquid cooling plate end cap 41 and the second liquid cooling plate end cap 42 are both welded to the housing 10.

[0076] The first vertical plate 31, the second vertical plate 32, the first liquid cooling plate end cap 41, the second liquid cooling plate end cap 42, and the shell 10 form a cavity with a liquid inlet 51 and a liquid outlet 52. A fin 70 is provided in the cavity, and the fin 70 divides the cavity into multiple flow channels. The liquid inlet 51 and the liquid outlet 52 are connected through the flow channels.

[0077] A first electrode roll 91 is disposed in the first cavity 21, and a second electrode roll 92 is disposed in the second cavity 22. The positive electrode tab of the first electrode roll 91 is located at the end where the first liquid cooling plate end cap 41 is located, and the negative electrode tab of the second electrode roll 92 is located at the end where the first liquid cooling plate is located. A positive end cap 61 electrically connected to the positive electrode tab of the first electrode roll 91 is disposed at the end of the first cavity 21 where the first liquid cooling plate end cap 41 is located; a negative end cap 62 electrically connected to the negative electrode tab of the second electrode roll 92 is disposed at the end of the second cavity 22 where the first liquid cooling plate end cap 41 is located.

[0078] The battery cell provided in this embodiment also includes an aluminum busbar 80 disposed at one end of the first liquid cooling plate end cover 41. The positive terminal cover 61 and the negative terminal cover 62, which are located at the same end as the first liquid cooling plate end cover 41, are electrically connected through the aluminum busbar 80 to realize the series connection between the first electrode roll 91 and the second electrode roll 92. The aluminum busbar 80 is spaced apart from the first liquid cooling plate end cover 41, the first vertical plate 31, and the second vertical plate 32 in both the length and height directions.

[0079] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0080] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell, characterized by, include, A housing, the housing comprising a first end and a second end located in the length direction, the first end and the second end having openings; A plate-shaped structural assembly for temperature regulation; the plate-shaped structural assembly extends along the length direction of the housing; the plate-shaped structural assembly divides the housing into two non-communicating cavities, each cavity having an opening at both ends along its length. The electrode rolls are disposed in the cavity, and the electrode rolls in adjacent cavities are electrically connected. A positive terminal cap is provided at one end of the cavity opening, and the positive terminal cap is electrically connected to the positive terminal tab of the electrode coil inside the cavity. And, a negative end cap is provided at the opening at the other end of the cavity, the negative end cap being electrically connected to the negative electrode tab of the electrode coil inside the cavity; The plate-shaped structural component includes, cavity, A first vertical plate and a second vertical plate are arranged side by side on both sides of the cavity, and the upper and lower sides of the first vertical plate and the second vertical plate are in contact with the shell. The first liquid-cooled plate end cap and the second liquid-cooled plate end cap are located at both ends of the cavity along its length. One side of the first liquid-cooled plate end cap and one side of the second liquid-cooled plate end cap are both connected to the first vertical plate. The other side of the first liquid-cooled plate end cap and the other side of the second liquid-cooled plate end cap are both connected to the second vertical plate. The plate-shaped structure assembly has a liquid inlet and a liquid outlet, both of which are connected to the cavity; In the height direction, the first vertical plate includes an upper part and a lower part, the height dimension of the upper part of the first vertical plate is not less than 15mm, and both ends of the upper part of the first vertical plate protrude from the edges of both ends of the shell in the length direction by at least 15mm. The outer dimensions of the second vertical plate are the same as those of the first vertical plate; Both the liquid inlet and the liquid outlet are located between the upper part of the first vertical plate and the upper part of the second vertical plate, and are located outside the housing; Both ends of the lower part of the first vertical plate protrude at least 3mm beyond the edges of both ends of the shell along its length direction. The positive end cap and the negative end cap, which are disposed on one side of the first vertical plate, are both welded to the first vertical plate. The positive end cap and the negative end cap, which are disposed on one side of the second vertical plate, are both welded to the second vertical plate, so that the first liquid cooling plate end cap and the second liquid cooling plate end cap are both welded to the edges of the first vertical plate and the second vertical plate, and the positive end cap and the negative end cap are both welded to the sides of the first vertical plate and the second vertical plate.

2. The battery cell according to claim 1, characterized in that, The thickness of the electrode roll is in the range of 5 to 30 mm.

3. The battery cell according to claim 1, characterized in that, The plate-shaped structure assembly also includes fins, the two sides of which are connected to the first vertical plate and the second vertical plate respectively, and are inclined relative to the first vertical plate and the second vertical plate; the fins divide the cavity into flow channels, and the liquid inlet and the liquid outlet are connected through the flow channels.

4. The battery cell according to claim 1, characterized in that, The electrode rolls within the housing are connected in series, and the polarities of adjacent electrode rolls are different at the first end of the housing; the positive end cap located at the first end of the housing and the negative end cap located at the first end of the housing are electrically connected by an aluminum busbar, and the aluminum busbar is spaced apart from the plate-shaped structure assembly in both the length and height directions of the housing.

5. The battery cell according to claim 1, characterized in that, The electrode rolls within the housing are connected in parallel, with the positive electrode tabs of the electrode rolls all located at the first end of the housing; the negative electrode tabs of the electrode rolls are all located at the second end of the housing. The positive end cap located at the first end of the housing is electrically connected via a first aluminum busbar; The negative end cap located at the second end of the housing is electrically connected via a second aluminum busbar; In the length and height directions of the housing, the plate-shaped structural components are spaced apart from the first aluminum busbar and the second aluminum busbar.

6. A battery pack, characterized in that, Includes the battery cell described in any one of claims 1-5.

7. An electric vehicle, characterized in that, The electric vehicle has a battery cell as described in any one of claims 1-5, or a battery pack as described in claim 6.

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