A type of battery cell

Abstract

This application provides a battery cell for the field of battery technology. Specifically, it is a battery cell comprising a cell body; the width direction of the cell body is a first direction, the length direction of the cell body is a second direction, and the thickness direction of the cell body is a third direction, with the first and second directions perpendicular to the third direction; the cell body has a hollow structure; an electrode post is disposed in the second direction of the cell body; and a liquid cooling structure is inserted into the hollow structure of the cell body and abuts against the inner surface of the hollow structure. The battery cell of this application, by pre-reserving a hollow structure in the cell body to allow the liquid cooling structure to pass through and abut against the interior of the cell body, allows the interior of the cell body to directly contact the liquid cooling structure, thus improving heat dissipation.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery cell. Background Technology

[0002] Currently, battery cell structures mainly consist of tabs at both ends or tabs on the same side. The basic structure of a battery cell is a cuboid, cube, or cylinder. During charging and discharging, the battery cell generates heat. After the heat accumulates, the temperature rise is highest in the middle of the battery cell and at the terminal. Some companies have adopted top liquid cooling solutions to improve the temperature rise of the terminal, but there is still no effective solution to improve the temperature rise in the middle of the battery cell. The only solution is to use general large-area or ground cooling to indirectly reduce the high temperature in the center of the battery cell. Utility Model Content

[0003] In view of this, this application provides a battery cell that has a hollow structure on the battery cell body that allows a liquid cooling structure to pass through it and abut against the inside of the battery cell body. This allows the inside of the battery cell body to directly contact the liquid cooling structure, thereby improving the heat dissipation effect.

[0004] To achieve the above objectives, this application provides the following technical solution:

[0005] A battery cell, comprising:

[0006] The battery cell body has a width direction as a first direction, a length direction as a second direction, and a thickness direction as a third direction, with the first and second directions perpendicular to the third direction; the battery cell body has a hollow structure that extends along the third direction.

[0007] The electrode post is disposed in the second direction of the cell body;

[0008] A liquid-cooled structure is inserted into the hollow structure of the battery cell body and abuts against the inner surface of the hollow structure.

[0009] Optionally, the hollow structure is a through hole that penetrates the thickness direction of the battery cell body, and the length direction of the through hole extends along the third direction.

[0010] Optionally, the cross-section of the through hole is rectangular or circular.

[0011] Optionally, when the cross-section of the through hole is rectangular, the dimension A1 of the through hole in the first direction satisfies: 1mm ≤ A1 ≤ 1000mm, the dimension A2 of the through hole in the second direction satisfies: 1mm ≤ A2 ≤ 1000mm, and the dimension of the through hole in the third direction is consistent with the thickness of the battery cell body; and / or,

[0012] When the cross-section of the through hole is circular, the radius R1 of the through hole satisfies: 0.5mm≤R1≤500mm; the dimension of the through hole in the third direction is consistent with the thickness of the battery cell body.

[0013] Optionally, the hollow structure is a notch that penetrates the thickness direction of the cell body, and the length direction of the notch extends along the third direction; the notch is formed on the edge of the cell body in the first direction or the second direction.

[0014] Optionally, the cross-section of the notch is semi-circular or rectangular.

[0015] Optionally, when the cross-section of the notch is rectangular, the dimension A3 of the notch in the first direction satisfies: 1mm ≤ A3 ≤ 1000mm, the dimension A4 of the notch in the second direction satisfies: 1mm ≤ A4 ≤ 1000mm, and the dimension of the notch in the third direction is consistent with the thickness of the cell body; and / or,

[0016] When the cross-section of the notch is semi-circular, the radius R2 of the notch satisfies: 0.5mm≤R2≤500mm; the dimension of the notch in the third direction is consistent with the thickness of the cell body.

[0017] Optionally, the electrode post includes a positive electrode post and a negative electrode post, and the positive electrode post and the negative electrode post are disposed on the same side or opposite side in the second direction.

[0018] Optionally, the hollow structure is a through hole penetrating the thickness direction of the battery cell body, or the hollow structure is a notch penetrating the thickness direction of the battery cell body. When the cross-section of the through hole is circular or the cross-section of the notch is semi-circular, the liquid cooling structure is a liquid cooling pipe inserted into the through hole or the notch; when the cross-section of the through hole or the notch is rectangular, the liquid cooling structure is a liquid cooling plate inserted into the through hole or the notch.

[0019] Optionally, multiple battery cell bodies can be stacked along the third direction and passed through the same liquid cooling structure; multiple different liquid cooling structures can be interconnected.

[0020] The battery cell of this application has a hollow structure on the battery cell body that allows the liquid cooling structure to pass through and abut against the inside of the battery cell body. This allows the inside of the battery cell body to directly contact the liquid cooling structure, thus improving the heat dissipation effect. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the through-hole type battery cell of this application. Figure 1 ;

[0023] Figure 2 This is a schematic diagram of the through-hole type battery cell of this application. Figure 2 ;

[0024] Figure 3 This is a schematic diagram of the through-hole type battery cell of this application. Figure 3 ;

[0025] Figure 4 for Figure 3 A schematic diagram of the through-hole type battery cell and liquid cooling pipe after assembly;

[0026] Figure 5 This is a schematic diagram of the notch-type battery cell of this application. Figure 1 ;

[0027] Figure 6 This is a schematic diagram of the notch-type battery cell of this application. Figure 2 ;

[0028] Figure 7 This is a schematic diagram of the notch-type battery cell of this application. Figure 3 ;

[0029] Figure 8 for Figure 6 A schematic diagram of the notched battery cell assembled with a liquid cooling plate;

[0030] Figure 9 This is a schematic diagram of the notch-type battery cell assembly according to this application. Figure 1 ;

[0031] Figure 10 This is a schematic diagram of the notch-type battery cell assembly according to this application. Figure 2 ;

[0032] Figure 11 for Figure 10 A schematic diagram of the assembled combined battery cell and liquid cooling plate.

[0033] exist Figures 1-11 middle:

[0034] 1. Cell body; 11. Through hole; 12. Notch; 2. Terminal; 31. Liquid cooling pipe; 32. Liquid cooling plate. Detailed Implementation

[0035] This application provides a battery cell that has a hollow structure on the battery cell body that allows a liquid cooling structure to pass through and abut against the inside of the battery cell body. This allows the inside of the battery cell body to directly contact the liquid cooling structure, thereby improving the heat dissipation effect.

[0036] 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. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] This application provides a battery cell, comprising:

[0038] The battery cell body 1 has a width direction as a first direction, a length direction as a second direction, and a thickness direction as a third direction. The first and second directions are perpendicular to the third direction. The battery cell body 1 has a hollow structure that extends along the third direction.

[0039] The electrode post 2 is disposed in the second direction of the cell body 1;

[0040] The liquid cooling structure is inserted into the hollow structure of the cell body 1 and abuts against the inner surface of the hollow structure; the liquid cooling structure can be a liquid cooling plate 32 or a liquid cooling pipe 31.

[0041] The battery cell of this application features a hollow structure pre-installed in the cell body 1, allowing the liquid cooling structure to pass through and abut against the interior of the cell body 1. This direct contact between the interior of the cell body 1 and the liquid cooling structure mitigates the drawbacks of high heat generation and heat accumulation in the center of the cell body 1. The liquid cooling structure passing through the temperature accumulation area of ​​the cell body 1 facilitates rapid heat reduction, improves the temperature consistency of the battery system, and consequently improves the cell cycle life and the overall battery pack life. This also helps reduce temperature-related SOC differences and voltage issues. Furthermore, extending the hollow structure along the first direction would be affected by the thickness of the cell body 1; extending it along the second direction might cause interference with the electrode post 2. Therefore, this application concludes that extending the hollow structure along a third direction, i.e., the thickness direction of the cell body 1, allows for a larger hollow structure, further enhancing heat dissipation.

[0042] In a preferred embodiment, such as Figures 1-4 As shown, the hollow structure is a through hole 11 that penetrates the thickness direction of the battery cell body 1, and the length direction of the through hole 11 extends along the third direction.

[0043] The so-called through hole 11 means that the hollow structure penetrates the cell body 1 only in the third direction, but the through hole 11 does not break through the edge of the cell body 1 in the first and second directions. The through hole 11 structure allows the liquid cooling plate 32 or liquid cooling pipe 31 to pass through the inside of the cell body 1 and directly transfer the heat generated in the center of the cell body 1 to the liquid cooling structure, thus avoiding the temperature rise in the center of the cell body 1. In addition, compared with the hollow structure of the notch 12 type, the advantage of the through hole 11 is that the liquid cooling plate 32 or liquid cooling pipe 31 is inserted in the through hole 11 structure and can be easily fixed and positioned by the through hole 11 structure.

[0044] In a preferred embodiment, such as Figures 1-4 As shown, the cross-section of the through hole 11 is rectangular or circular.

[0045] Rectangular through-holes 11 are suitable for inserting liquid cooling plates 32, while circular through-holes 11 are suitable for inserting liquid cooling pipes 31. In short, when inserting the liquid cooling structure into the through-hole 11, the liquid cooling structure should be made as close as possible to the inner surface of the through-hole 11 to increase the heat transfer area and improve the heat dissipation effect. In addition, the number of through-holes 11 can be one or more, and the specific number and layout can be set according to the actual situation.

[0046] In a preferred embodiment, the size of the through hole 11 should be adapted to the actual size of the battery cell body 1. If it is too large, it will affect the strength of the battery cell body 1; if it is too small, it will not achieve the heat dissipation effect. The size of the liquid cooling plate 32 / liquid cooling pipe 31 should be consistent with the size of the through hole 11. Figures 1-4 As shown, when the cross-section of the through hole 11 is rectangular, the dimension A1 of the through hole 11 in the first direction satisfies: 1mm ≤ A1 ≤ 1000mm, and the dimension A2 of the through hole 11 in the second direction satisfies: 1mm ≤ A2 ≤ 1000mm; when the dimension of the through hole 11 in the second direction is greater than the dimension in the first direction, then as shown... Figure 1 As shown, when the dimension of the through hole 11 in the first direction is larger than the dimension in the second direction, then as follows: Figure 2 As shown, the dimension of the through hole 11 in the third direction is consistent with the thickness of the cell body 1; and / or,

[0047] like Figure 3 and Figure 4 As shown, when the cross-section of the through hole 11 is circular, the radius R1 of the through hole 11 satisfies: 0.5mm≤R1≤500mm; the dimension of the through hole 11 in the third direction is consistent with the thickness of the cell body 1.

[0048] In a preferred embodiment, such as Figures 5-8As shown, the hollow structure is a notch 12 that penetrates the thickness direction of the cell body 1, and the length direction of the notch 12 extends along a third direction; the notch 12 is formed on the edge of the cell body 1 in the first or second direction, such as... Figure 5 The gap 12 can be opened on the side facing the second direction away from the pole post 2, or as follows: Figure 6 It can be located on one side facing the first direction, or on both sides facing the first direction.

[0049] The so-called notch 12 refers to the hollow structure not only penetrating the cell body 1 in a third direction, but also breaking through the edge of the cell body 1 in a first or second direction. The inner surface of the notch 12 is connected to the outer surface of the cell body 1. The purpose of setting the notch 12 on the cell body 1 is to directly lead the liquid cooling plate or liquid cooling pipe 31 into the cell body 1 to achieve a cooling effect. Compared with the through hole 11, since the notch 12 is open, the liquid cooling plate 32 or liquid cooling pipe 31 inserted inside it can be exposed from the notch 12 and simultaneously inserted into other cell bodies 1 adjacent to the cell body 1 in the first direction, thereby realizing the situation where multiple cell bodies 1 share the same liquid cooling plate 32 or liquid cooling pipe 31. The number of notches 12 can be one or more, and the specific number and layout can be set according to the actual situation.

[0050] In a preferred embodiment, such as Figures 5-8 As shown, the cross-section of notch 12 is semi-circular or rectangular.

[0051] The rectangular notch 12 is suitable for inserting the liquid cooling plate 32, while the semi-circular notch 12 is suitable for inserting the liquid cooling pipe 31. In short, when inserting the liquid cooling structure into the notch 12, the liquid cooling structure should be made to fit as closely as possible to the inner surface of the notch 12, thereby increasing the heat transfer area and improving the heat dissipation effect.

[0052] In a preferred embodiment, the size of the notch 12 should be adapted to the actual size of the battery cell body 1. If it is too large, it will affect the strength of the battery cell body 1; if it is too small, it will not achieve the heat dissipation effect. The size of the liquid cooling plate 32 / liquid cooling pipe 31 should be consistent with the size of the notch 12. Figures 5-8 As shown, when the cross-section of the notch 12 is rectangular, the dimension A3 of the notch 12 in the first direction satisfies: 1mm ≤ A3 ≤ 1000mm, and the dimension A4 of the notch 12 in the second direction satisfies: 1mm ≤ A4 ≤ 1000mm. Furthermore, when the notch 12 faces the first direction, its dimension in the first direction is greater than its dimension in the second direction; when the notch 12 faces the second direction, its dimension in the second direction is greater than its dimension in the first direction, to facilitate the splicing of the liquid cooling plate 32 with the cell body 1. The dimension of the notch 12 in the third direction is consistent with the thickness of the cell body 1; and / or...

[0053] When the cross-section of the notch 12 is semi-circular, the radius R2 of the notch 12 satisfies: 0.5mm≤R2≤500mm; the dimension of the notch 12 in the third direction is consistent with the thickness of the cell body 1.

[0054] In a preferred embodiment, such as Figures 1-11 As shown, the terminal post 2 includes a positive terminal post 2 and a negative terminal post 2. Depending on the layout requirements of the cells within the battery pack, the positive terminal post 2 and the negative terminal post 2 can be positioned on the same side in the second direction (e.g., ...). Figure 10 ) or the opposite side (such as Figure 9 Regardless of whether the positive terminal 2 and the negative terminal 2 are located on the same side or opposite side in the second direction, it will not affect the liquid cooling structure passing through the cell body 1.

[0055] In a preferred embodiment, such as Figures 1-11 As shown, the hollow structure is either a through hole 11 penetrating the thickness direction of the cell body 1, or a notch 12 penetrating the thickness direction of the cell body 1. To ensure the liquid cooling structure fits snugly against the hollow structure, when the cross-section of the through hole 11 is circular or the cross-section of the notch 12 is semi-circular, the liquid cooling structure is a liquid cooling pipe 31 inserted within the through hole 11 or the notch 12; when the cross-section of the through hole 11 or the notch 12 is rectangular, the liquid cooling structure is a liquid cooling plate 32 inserted within the through hole 11 or the notch 12. Alternatively, through holes 11 or notches 12 can be simultaneously provided on the same cell body 1, which can be configured according to actual conditions.

[0056] In a preferred embodiment, such as Figure 4 As shown, multiple battery cell bodies 1 can be stacked along a third direction to form a group of battery cell bodies 1, and passed through the same liquid cooling structure; while as Figure 8 As shown, the four sets of battery cell bodies 1 can be cooled by two liquid cooling plates 32, and the two liquid cooling plates 32 can be interconnected; similarly, as Figures 9-11 As shown, the three (or four) battery cell bodies 1 can be cooled by three liquid cooling pipes 31. The three liquid cooling pipes 31 are arranged in parallel and connected to the fourth liquid cooling pipe 31, thus joining the entire cooling cycle.

[0057] The combination of multiple battery cell bodies 1 allows the liquid cooling structure to pass through one or more stacked battery cells, improving the liquid cooling transfer efficiency.

[0058] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0059] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the word “or” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0060] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled or recombined. These disassemblies or recombinations should be considered as equivalent solutions of this application.

[0061] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0062] It should be understood that the qualifiers “first,” “second,” “third,” “fourth,” “fifth,” and “sixth” used in the description of the embodiments of this application are only used to more clearly illustrate the technical solutions and are not intended to limit the scope of protection of this application.

[0063] The above description has been given for illustrative and descriptive purposes. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A battery cell, characterized in that, include: The battery cell body (1) has a width direction as a first direction, a length direction as a second direction, and a thickness direction as a third direction. The first direction and the second direction are perpendicular to the third direction. The battery cell body (1) has a hollow structure that extends along the third direction. The electrode post (2) is disposed in the second direction of the battery cell body (1); The liquid cooling structure is inserted into the hollow structure of the cell body (1) and abuts against the inner surface of the hollow structure.

2. The battery cell according to claim 1, characterized in that, The hollow structure is a through hole (11) that penetrates the thickness direction of the battery cell body (1), and the length direction of the through hole (11) extends along the third direction.

3. The battery cell according to claim 2, characterized in that, The cross-section of the through hole (11) is rectangular or circular.

4. The battery cell according to claim 3, characterized in that, When the cross-section of the through hole (11) is rectangular, the dimension A1 of the through hole (11) in the first direction satisfies: 1mm≤A1≤1000mm, the dimension A2 of the through hole (11) in the second direction satisfies: 1mm≤A2≤1000mm, and the dimension of the through hole (11) in the third direction is consistent with the thickness of the battery cell body (1); and / or, When the cross-section of the through hole (11) is circular, the radius R1 of the through hole (11) satisfies: 0.5mm≤R1≤500mm; the dimension of the through hole (11) in the third direction is consistent with the thickness of the battery cell body (1).

5. The battery cell according to claim 1, characterized in that, The hollow structure is a notch (12) that penetrates the thickness direction of the cell body (1), and the length direction of the notch (12) extends along the third direction; the notch (12) is formed on the edge of the cell body (1) in the first direction or the second direction.

6. The battery cell according to claim 5, characterized in that, The cross-section of the notch (12) is semi-circular or rectangular.

7. The battery cell according to claim 6, characterized in that, When the cross-section of the notch (12) is rectangular, the dimension A3 of the notch (12) in the first direction satisfies: 1mm≤A3≤1000mm, the dimension A4 of the notch (12) in the second direction satisfies: 1mm≤A4≤1000mm, and the dimension of the notch (12) in the third direction is consistent with the thickness of the cell body (1); and / or, When the cross-section of the notch (12) is semi-circular, the radius R2 of the notch (12) satisfies: 0.5mm≤R2≤500mm; the dimension of the notch (12) in the third direction is consistent with the thickness of the cell body (1).

8. The battery cell according to claim 1, characterized in that, The electrode (2) includes a positive electrode and a negative electrode, which are disposed on the same side or opposite side in the second direction.

9. The battery cell according to claim 1, characterized in that, The hollow structure is a through hole (11) penetrating the thickness direction of the battery cell body (1), or the hollow structure is a notch (12) penetrating the thickness direction of the battery cell body (1). When the cross-section of the through hole (11) is circular or the cross-section of the notch (12) is semi-circular, the liquid cooling structure is a liquid cooling pipe (31) inserted into the through hole (11) or the notch (12); when the cross-section of the through hole (11) or the notch (12) is rectangular, the liquid cooling structure is a liquid cooling plate (32) inserted into the through hole (11) or the notch (12).

10. The battery cell according to claim 1, characterized in that, Multiple battery cell bodies (1) can be stacked along the third direction and passed through the same liquid cooling structure; multiple different liquid cooling structures can be interconnected.

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