Battery cell and battery system

Abstract

The utility model discloses a battery cell and a battery system. The battery cell comprises a shell, a battery cell body and a pole, a containing cavity is formed in the shell, an opening is formed in the side face, perpendicular to the length direction, of the shell, the battery cell body is arranged in the containing cavity, and the pole is arranged on the side face, perpendicular to the length direction, of the battery cell body and extends out of the opening; the pole columns comprise a positive pole column and a negative pole column, each of the positive pole column and the negative pole column comprises a pole column body and an aluminum bar structure, the pole column bodies and the aluminum bar structures are of an integrated structure, and the aluminum bar structures are located on the sides, deviating from the battery cell body, of the pole column bodies; and the thickness direction of the aluminum bar structure is parallel to the thickness direction of the battery cell. The pole of the battery cell is designed into the integrated structure comprising the pole body and the aluminum bar structure, so that the transverse connection between the battery cells is realized, and the heat dissipation effect is improved.

Description

Technical Field

[0001] The present application relates to the technical field of power batteries, and in particular to a battery cell and a battery system. Background Art

[0002] The cell structure in the power battery system determines the design and assembly principles of the battery system. At present, the battery cells generally adopt the method of outputting poles at both ends or on the same side, and the existence of the poles will affect the welding of the busbar. At present, in order to achieve the connection between the battery cells, people usually use aluminum bar structures to weld the poles of the two battery cells. However, due to the influence of welding equipment, the battery cell poles can only face outward and cannot be blocked, that is, the battery cells can only be connected in a vertical manner, so the head-to-tail connection of the battery cells cannot be achieved, which makes the battery cells unable to be placed "lying down", affecting the thermal management effect of the battery. Utility Model Content

[0003] The present application discloses a battery cell and a battery system. By designing the pole of the battery cell to be an integrated structure including a pole body and an aluminum bar structure, it is beneficial to achieve a horizontal connection between the battery cells and improve the heat dissipation effect.

[0004] In order to achieve the above objectives, this application provides the following technical solutions:

[0005] In a first aspect, the present application provides a battery cell, including a shell, a battery cell body and a pole;

[0006] A receiving cavity is formed inside the shell, a side of the shell perpendicular to the length direction is provided with an opening, the battery body is arranged in the receiving cavity, and the pole is arranged on the side of the battery body perpendicular to the length direction and extends out of the opening;

[0007] The pole comprises a positive pole and a negative pole, and the positive pole and the negative pole both comprise a pole body and an aluminum bar structure, the pole body and the aluminum bar structure are an integrated structure, and the aluminum bar structure is located on a side of the pole body away from the battery cell body;

[0008] The thickness direction of the aluminum bar structure is parallel to the thickness direction of the battery core.

[0009] The pole columns of the above-mentioned battery cells are designed as an integrated structure including an aluminum bar structure, which is beneficial to realizing the horizontal connection between battery cells and improving the heat dissipation effect. Specifically, for the battery cells of the present application, the battery cell body is arranged in the accommodation cavity formed by the housing, the pole columns are arranged on the side surface of the battery cell body perpendicular to the length direction, and extend out of the side opening of the housing perpendicular to the length direction. The battery cell includes a positive pole column and a negative pole column, and both the positive pole column and the negative pole column include a pole column body and an aluminum bar structure. The pole column body and the aluminum bar structure of each pole column are an integrated structure, and the thickness direction of the aluminum bar structure is parallel to the thickness direction of the battery cell. For example, the pole column body and the aluminum bar structure can be integrally cast. With such an arrangement, the welding steps between the pole column and the aluminum bar are reduced, and only the connection of the aluminum bar structures between different battery cells is involved, and it is no longer limited by the welding equipment. In addition, the extending direction of the free end (i.e., the end away from the battery cell body) of the aluminum bar structure of the battery cell of the present application is perpendicular to the side surface of the battery cell body perpendicular to the length direction, so that the horizontal placement of the battery cells can be realized, which is further beneficial to realizing the head-to-tail connection between the battery cells and is beneficial to improving the heat dissipation effect of the battery cells.

[0010] In some embodiments, the positive pole column and the negative pole column are respectively arranged on the first side surface and the second side surface of the battery cell body, and respectively extend out of the first opening and the second opening; wherein, the first side surface and the second side surface are two opposite surfaces of the battery cell body perpendicular to the length direction, and the first opening and the second opening are arranged on two opposite side surfaces of the housing perpendicular to the length direction.

[0011] In some embodiments, the positive pole column and the negative pole column are both arranged on the same side surface of the battery cell body perpendicular to the length direction, and respectively extend out of the first opening and the second opening; the first opening and the second opening are arranged on the same side surface of the housing perpendicular to the length direction.

[0012] In some embodiments, the material of the pole column body of the positive pole column is pure aluminum, and the material of the pole column body of the negative pole column is a copper-aluminum composite material.

[0013] In some embodiments, an explosion-proof valve is provided on the housing.

[0014] In a second aspect, the present application provides a battery system, including at least one layer of battery cell assemblies, each layer of the battery cell assemblies including at least one row of battery cell chains, and each row of the battery cell chains including at least one battery cell as described in the first aspect;

[0015] When each row of the battery cell chains includes a plurality of the battery cells, along the length direction of the battery cells, the plurality of battery cells are sequentially connected head to tail.

[0016] In some embodiments, when each row of the battery cell chain includes a plurality of the battery cells, among any two adjacent battery cells, the aluminum bar structure of the positive electrode post of one battery cell is partially attached and connected to the aluminum bar structure of the negative electrode post of the other battery cell along the thickness direction of the battery cell.

[0017] In some embodiments, when the battery system includes multiple rows of battery cell chains, the battery system further includes a bus bar;

[0018] Among any two adjacent rows of the battery cell chains, one end of the bus bar is connected to one battery cell in one row of the battery cell chains, and the other end is connected to one battery cell in another row of the battery cell chains.

[0019] In some embodiments, the battery system further includes a liquid cooling plate;

[0020] When the battery system includes one layer of the battery cell assembly, the liquid cooling plate is in contact connection with the battery cell assembly;

[0021] When the battery system includes multiple layers of the battery cell assembly, the liquid cooling plate is disposed between any two adjacent layers of the battery cell assemblies and is in contact connection with both layers of the battery cell assemblies.

[0022] In some embodiments, the connection method includes at least one of welding and bolt connection. Description of the Drawings

[0023] Figure 1 It is a schematic structural diagram of a battery cell provided by an embodiment of the present application;

[0024] Figure 2 It is a front view structural diagram of a battery cell provided by an embodiment of the present application;

[0025] Figure 3 It is a top view structural diagram of a battery cell provided by an embodiment of the present application;

[0026] Figure 4 It is another top view structural diagram of a battery cell provided by an embodiment of the present application;

[0027] Figure 5 It is a side view structural diagram of a battery cell provided by an embodiment of the present application;

[0028] Figure 6 It is a schematic structural diagram of a battery system provided by an embodiment of the present application;

[0029] Figure 7 It is a top view structural diagram of a battery system provided by an embodiment of the present application;

[0030] Figure 8 It is a front view structural diagram of a battery system provided by an embodiment of the present application;

[0031] Figure 9 The bottom view structural schematic diagram of a battery system provided by an embodiment of the present application;

[0032] Figure 10 The side view structural schematic diagram of a battery system provided by an embodiment of the present application;

[0033] Figure 11 The top view structural schematic diagram of another battery system provided by an embodiment of the present application;

[0034] Icons: 100, battery cell; 200, battery system; 1, housing; 2, terminal; 21, terminal body; 22, aluminum bar structure; A, positive terminal; B, negative terminal; 3, explosion-proof valve; 4, battery cell assembly; 5, battery cell chain; 6, bus bar; 7, liquid cooling plate. Detailed implementation manners

[0035] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application. Among them, in the description of the embodiments of the present application, unless otherwise specified, " / " means "or". For example, A / B may represent A or B; "and / or" in the text is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of the present application, "a plurality of" means two or more than two.

[0036] Among them, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more than two.

[0037] In the first aspect, as Figures 1 - 5 shown, the present application provides a battery cell 100, including a housing 1, a battery cell body, and a terminal 2;

[0038] An accommodation cavity is formed inside the housing 1. An opening is provided on the side surface of the housing perpendicular to the length direction. The battery cell body is disposed in the accommodation cavity. The terminal 2 is disposed on the side surface of the battery cell body perpendicular to the length direction and extends out of the opening;

[0039] The pole 2 includes a positive pole A and a negative pole B. The positive pole A and the negative pole B each include a pole body 21 and an aluminum bar structure 22. The pole body 21 and the aluminum bar structure 22 are an integrated structure, and the aluminum bar structure 22 is located on the side of the pole body 21 away from the battery body.

[0040] The thickness direction of the aluminum bar structure 22 is parallel to the thickness direction of the battery cell body.

[0041] like Figures 1 - 4 As shown, the pole 2 of the battery cell 100 is designed to be an integrated structure including a pole body 21 and an aluminum bar structure 22, which is conducive to realizing the horizontal connection between the battery cells 100 and 100, and improving the heat dissipation effect. Specifically, the battery cell 100 of the present application sets the battery body in the accommodating cavity formed by the shell, and the pole 2 is set at the battery body perpendicular to the length direction ( Figure 1 The side of the housing is perpendicular to the length direction ( Figure 1 The battery cell 100 includes a positive electrode post A and a negative electrode post B, and the positive electrode post A and the negative electrode post B each include a pole body 21 and an aluminum bar structure 22, the pole body 21 and the aluminum bar structure 22 of each pole are an integrated structure, and the thickness direction of the aluminum bar structure 22 is parallel to the thickness direction of the battery cell 100. For example, the pole body 21 and the aluminum bar structure 22 can be formed by integral casting. With such a configuration, the number of welding steps between the pole and the aluminum bar is reduced, and only a one-time connection of the aluminum bar structure 22 between different battery cells is involved, which is no longer limited by the influence of welding equipment. In addition, the extension direction of the free end (i.e., the end away from the battery cell body) of the aluminum bar structure 22 of the battery cell 100 of the present application is perpendicular to the length direction ( Figure 1 The side surfaces in the direction a) are vertical, so that the battery cells 100 can be placed horizontally, which is further beneficial to achieve head-to-tail connection between different battery cells 100 and improve the heat dissipation effect of the battery cells 100.

[0042] In some embodiments, the positive electrode column A and the negative electrode column B are respectively arranged on the first side and the second side of the battery cell body, and extend out of the first opening and the second opening respectively; wherein the first side and the second side are two opposite surfaces of the battery cell body perpendicular to the length direction, and the first opening and the second opening are arranged on two opposite sides of the shell perpendicular to the length direction.

[0043] One possible way to achieve this is as follows: Figures 1 - 3As shown, the positive electrode post A of the battery cell 100 is provided on one side surface of the battery cell body perpendicular to the length direction, and extends out of the opening on the side surface of the housing perpendicular to the length direction. The negative electrode post B is provided on the other side surface of the battery cell body perpendicular to the length direction, and extends out of the opening on the other side surface of the housing perpendicular to the length direction. Such a setting is conducive to realizing the end-to-end connection between different battery cells 100, that is, a primary connection between the positive electrode post A / negative electrode post B of one battery cell 100 and the negative electrode post B / positive electrode post A of another battery cell 100, and further conducive to increasing the heat dissipation area and improving the heat dissipation effect.

[0044] In some embodiments, both the positive electrode post A and the negative electrode post B are provided on the same side surface of the battery cell body perpendicular to the length direction, and respectively extend out of the first opening and the second opening; the first opening and the second opening are provided on the same side surface of the housing perpendicular to the length direction.

[0045] In a possible implementation manner, as Figure 4 shown, the positive electrode post A of the battery cell 100 is provided on one side surface of the battery cell body perpendicular to the length direction, and extends out of the opening on the side surface of the housing perpendicular to the length direction. The negative electrode post B is provided on the surface of the battery cell body on the same side as the positive electrode post A, and extends out of the opening on the other side surface of the housing perpendicular to the length direction. Such a setting can also realize the horizontal placement of the battery cell 100, and can also realize the horizontal connection between different battery cells 100, and is further conducive to increasing the heat dissipation area and improving the heat dissipation effect.

[0046] In some embodiments, the material of the post body 21 of the positive electrode post A is pure aluminum, and the material of the post body 22 of the negative electrode post B is copper-aluminum composite material.

[0047] In some embodiments, as Figure 5 shown, an explosion-proof valve 3 is provided on the housing 1. The explosion-proof valve 3 mainly plays a role in monitoring the internal pressure and temperature. When the internal pressure or temperature of the housing 1 exceeds the limit, the explosion-proof valve 3 will automatically open, thereby releasing the internal pressure and ensuring safety.

[0048] In a second aspect, as Figures 6 - 11 shown, the present application provides a battery system 200, including at least one layer of battery cell assemblies 4, each layer of battery cell assemblies 4 includes at least one row of battery cell chains 5, and each row of battery cell chains 5 includes at least one battery cell 100 as in the first aspect;

[0049] When each row of battery cell chains 5 includes a plurality of battery cells 100, along the length direction of the battery cells 100, the plurality of battery cells 100 are sequentially connected end to end.

[0050] In a possible implementation manner, as Figure 6As shown, the battery system 200 includes a three-layer battery cell assembly 4. Each layer of the battery cell assembly 4 includes three rows of battery cell chains 5. Each row of battery cell chains 5 includes four battery cells 100. The four battery cells 100 are connected end to end in sequence, that is, connected in series. In this application, multiple horizontally arranged battery cells 100 are arranged in layers, which is beneficial to increasing the heat dissipation area of the battery cells 100 and improving the heat dissipation effect. It should be noted that in the embodiments of this application, the number of layers of the battery cell assembly 4, the number of rows of battery cell chains 5 in each layer of the battery cell assembly 4, and the number of battery cells 100 in each row of battery cell chains 5 can be set according to actual application situations, and the quantities are not specifically limited.

[0051] In some embodiments, when each row of battery cell chains 5 includes multiple battery cells 100, among any two adjacent battery cells 100, the aluminum bar structure 22 of the positive electrode post A of one battery cell 100 is partially attached and connected to the aluminum bar structure 22 of the negative electrode post B of the other battery cell 100 along the thickness direction of the battery cell 100.

[0052] In a possible implementation manner, as Figure 7 and Figure 8 shown, since the electrode post body 21 and the aluminum bar structure 22 of the battery cell 100 in this application are an integrated structure, the welding steps between the electrode post and the aluminum bar are reduced, and only the connection of the aluminum bar structures 22 between different battery cells is involved, and it is no longer limited by the welding equipment. In addition, in this application, the battery cells 100 can be horizontally arranged, realizing the head-to-tail connection between different battery cells 100, which is beneficial to improving the heat dissipation effect of the battery cells 100.

[0053] In some embodiments, when the battery system 200 includes multiple rows of battery cell chains 5, the battery system 200 further includes a bus bar 6;

[0054] Among any two adjacent rows of battery cell chains 5, one end of the bus bar 6 is connected to a battery cell 100 in one row of battery cell chains 5, and the other end is connected to a battery cell 100 in another row of battery cell chains 5.

[0055] In a possible implementation manner, as Figure 9 and Figure 10 shown, in order to realize the series connection between different battery cell chains 5, this application also provides a bus bar 6. One end of the bus bar 6 is connected to the electrode post 2 of a battery cell 100 in one row of battery cell chains 5 of the battery system 200, and the other end is connected to the electrode post 2 of a battery cell 100 in another row of battery cell chains 5 of the battery system 200.

[0056] In some embodiments, the battery system 200 further includes a liquid cooling plate 7;

[0057] When the battery system 200 includes one layer of battery cell assembly 4, the liquid cooling plate 7 is in contact connection with the battery cell assembly 4;

[0058] When the battery system 200 includes a multi-layer battery cell assembly 4, the liquid cooling plate 7 is disposed between any two adjacent layers of the battery cell assemblies 4 and is in contact connection with both layers of the battery cell assemblies 4.

[0059] In a possible implementation manner, as Figures 8 - 10 shown, when the battery system 200 includes only one layer of the battery cell assembly 4, the liquid cooling plate 7 is disposed on one surface of this layer of the battery cell assembly 4 perpendicular to the thickness direction, so that all the battery cells 100 in the battery cell assembly 4 are in contact with the liquid cooling plate 7, increasing the direct contact area between the battery cells 100 and the liquid cooling plate 7, which is beneficial to improving the cooling efficiency of the battery cell assembly 4.

[0060] In another possible implementation manner, as Figure 6 shown, when the battery system 200 includes a multi-layer battery cell assembly 4, the liquid cooling plate 7 is disposed between any two adjacent layers of the battery cell assemblies 4, so that each layer of the battery cell assembly 4 can be directly in contact with the liquid cooling plate 7 to improve the heat dissipation effect and the cooling efficiency. That is to say, after the battery cells 100 are placed horizontally, the number of the liquid cooling plates 7 is increased, improving the liquid cooling effect of the battery cell assembly 4.

[0061] In some embodiments, the connection manner of the aluminum bars 22 of any two battery cells 100 includes at least one of welding and bolt connection. The connection manner between the bus bar 6 and the pole 2 of the battery cell 100 can be welding or the like.

[0062] It should be added that, as Figure 11 shown, when both the positive pole A and the negative pole B of the battery cell 100 are disposed on the same side surface of the battery cell body perpendicular to the length direction, the horizontal connection between two battery cells 100 can also be realized, which is also beneficial to increasing the heat dissipation area and improving the heat dissipation effect.

[0063] In this application, the connection manner of battery cell - aluminum bar - battery cell in the battery system is changed to battery cell - battery cell connection. Among them, the pole (including the pole body and the aluminum bar structure) is integrally cast, canceling the welding step between the aluminum bar and the pole, simplifying the system assembly process, reducing the welding impedance, and improving the charging efficiency.

[0064] Obviously, those skilled in the art can make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalent technologies, this application also intends to include these changes and modifications.

Claims

1. A battery cell, characterized in that: It includes a shell, a battery cell body and a pole; A receiving cavity is formed inside the shell, a side of the shell perpendicular to the length direction is provided with an opening, the battery body is arranged in the receiving cavity, and the pole is arranged on the side of the battery body perpendicular to the length direction and extends out of the opening; The pole comprises a positive pole and a negative pole, and the positive pole and the negative pole both comprise a pole body and an aluminum bar structure, the pole body and the aluminum bar structure are an integrated structure, and the aluminum bar structure is located on a side of the pole body away from the battery cell body; The thickness direction of the aluminum bar structure is parallel to the thickness direction of the battery core.

2. The battery cell according to claim 1, characterized in that: The positive electrode column and the negative electrode column are respectively arranged on the first side and the second side of the battery cell body, and extend out of the first opening and the second opening respectively; wherein the first side and the second side are two opposite surfaces of the battery cell body perpendicular to the length direction, and the first opening and the second opening are arranged on two opposite sides of the shell perpendicular to the length direction.

3. The battery cell according to claim 1, characterized in that: The positive electrode column and the negative electrode column are both arranged on the same side of the battery body perpendicular to the length direction, and extend out of the first opening and the second opening respectively; the first opening and the second opening are arranged on the same side of the shell perpendicular to the length direction.

4. The battery cell according to any one of claims 1 to 3, characterized in that: The material of the pole body of the positive pole is pure aluminum, and the material of the pole body of the negative pole is a copper-aluminum composite material.

5. The battery cell according to any one of claims 1 to 3, characterized in that: An explosion-proof valve is arranged on the shell.

6. A battery system, characterized in that: Comprising at least one layer of battery cell assemblies, each layer of the battery cell assemblies comprising at least one row of battery cell chains, and each row of the battery cell chains comprising at least one battery cell according to any one of claims 1 to 5; When each row of the battery cell chain includes a plurality of the battery cells, the plurality of battery cells are connected end to end in sequence along the length direction of the battery cells.

7. The battery system according to claim 6, characterized in that: When each row of the battery cell chain includes a plurality of the battery cells, in any two adjacent battery cells, the aluminum bar structure of the positive electrode column of one battery cell is partially fitted and connected with the aluminum bar structure of the negative electrode column of the other battery cell along the thickness direction of the battery cells.

8. The battery system according to claim 7, characterized in that: When the battery system includes multiple rows of battery cell chains, the battery system further includes a bus bar; In any two adjacent rows of the battery cell chains, one end of the busbar is connected to a battery cell in one row of the battery cell chain, and the other end is connected to a battery cell in the other row of the battery cell chain.

9. The battery system according to claim 8, characterized in that: The battery system also includes a liquid cooling plate; When the battery system includes a layer of the battery cell assembly, the liquid cooling plate is in contact with and connected to the battery cell assembly; When the battery system includes multiple layers of the battery cell assemblies, the liquid cooling plate is disposed between any two adjacent layers of the battery cell assemblies and is in contact and connection with both layers of the battery cell assemblies.

10. The battery system according to claim 6, characterized in that: The connection method includes at least one of welding and bolt connection.

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