Battery housing, battery cell and battery pack

Abstract

A battery housing, a battery cell and a battery pack. The battery housing comprises a first plate body; a second plate body, which is arranged opposite the first plate body; a third plate body, which is arranged between the first plate body and the second plate body; and a fourth plate body, which is arranged between the first plate body and the second plate body and is arranged opposite the third plate body, wherein the first plate body, the second plate body, the third plate body and the fourth plate body form an accommodating structure having a hollow interior and two open ends; the area of the third plate body is greater than that of the first plate body and that of the second plate body; the area of the fourth plate body is greater than that of the first plate body and that of the second plate body; the thickness of the wall of the first plate body is greater than that of the wall of the third plate body and that of the wall of the fourth plate body; and the thickness of the wall of the second plate body is greater than that of the wall of the third plate body and that of the wall of the fourth plate body.

Description

A battery casing, a battery cell, and a battery pack

[0001] This application claims priority to Chinese Patent Application No. 202520136684.1, filed on January 20, 2025, entitled "A Battery Casing, Battery Cell and Battery Pack", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to a battery casing, a battery cell, and a battery pack. Background Technology

[0003] A battery casing typically has four sides, which are divided into two large, opposing sides and two side sides according to their area. When multiple battery cells are arranged, the large sides of two adjacent battery cells will contact each other, forming a strong constraint between them, while the side sides will contact the liquid cooling plate, which will provide a weak constraint to the side sides.

[0004] As usage time increases, the amount of gas generated inside the battery cell gradually increases, and the weakly constrained side will deform and bulge, reducing the contact area between the side and the liquid cooling plate and affecting the cooling effect of the battery cell. Summary of the Invention

[0005] The following is an overview of the detailed description of this application. This overview is not intended to limit the scope of the claims.

[0006] Purpose of this application: This application provides a battery casing to solve the problem that the sides of the battery cell are prone to deformation and bulging, which affects the cooling effect of the battery cell; this application also provides a battery cell; this application also provides a battery pack.

[0007] In a first aspect, this application provides a battery casing, comprising:

[0008] First plate;

[0009] The second plate is disposed opposite to the first plate.

[0010] The third plate is disposed between the first plate and the second plate;

[0011] The fourth plate is disposed between the first plate and the second plate, and is disposed opposite to the third plate;

[0012] The first plate, the second plate, the third plate, and the fourth plate form a hollow, open-end structure; the area of ​​the third plate is greater than the area of ​​the first plate, and the area of ​​the third plate is greater than the area of ​​the second plate; the area of ​​the fourth plate is greater than the area of ​​the first plate, and the area of ​​the fourth plate is greater than the area of ​​the second plate.

[0013] The wall thickness of the first plate is greater than the wall thickness of the third plate, and the wall thickness of the first plate is greater than the wall thickness of the fourth plate; the wall thickness of the second plate is greater than the wall thickness of the third plate, and the wall thickness of the second plate is greater than the wall thickness of the fourth plate.

[0014] In some embodiments, the width w1 and the thickness t1 of the first plate body satisfy: 40mm≤w1≤85mm, 0.5mm≤t1≤2mm, and 1.33%≤t1 / w1≤3.5%.

[0015] In some embodiments, the width w1 and the thickness t1 of the first plate body further satisfy: 1.33%≤t1 / w1≤3%.

[0016] In some embodiments, the width w2 and the thickness t2 of the second plate body satisfy: 40mm≤w2≤85mm, 0.5mm≤t2≤2mm, and 1.33%≤t2 / w2≤3.5%.

[0017] In some embodiments, the width w2 and the thickness t2 of the second plate body satisfy: 1.33%≤t2 / w2≤3%.

[0018] In some embodiments, the thickness t3 of the third plate satisfies: 0.25mm≤t3≤1mm.

[0019] In some embodiments, the thickness t4 of the fourth plate satisfies: 0.25mm≤t4≤1mm.

[0020] In some embodiments, the lengths L1 of the first plate, L2 of the second plate, L3 of the third plate, and L4 of the fourth plate satisfy: L1≥300mm, L2≥300mm, L3≥300mm, and L4≥300mm.

[0021] In some embodiments, the width w1 and the thickness t1 of the first plate body satisfy: 12mm≤w1<40mm, 0.5mm≤t1≤2mm, and 1.5%≤t1 / w1≤11.67%.

[0022] In some embodiments, the width w1 and the thickness t1 of the first plate body further satisfy: 1.5% ≤ t1 / w1 ≤ 6%.

[0023] In some embodiments, the width w2 and the thickness t2 of the second plate body satisfy: 12mm≤w2<40mm, 0.5mm≤t2≤2mm, and 1.5%≤t2 / w2≤11.67%.

[0024] In some embodiments, the width w2 and the thickness t2 of the second plate also satisfy: 1.5% ≤ t2 / w2 ≤ 6%.

[0025] In some embodiments, the thickness t3 of the third plate satisfies: 0.3mm ≤ t3 ≤ 0.65mm.

[0026] In some embodiments, the thickness t4 of the fourth plate satisfies: 0.3mm≤t4≤0.65mm.

[0027] In some embodiments, the length L1 of the first plate, the length L2 of the second plate, the length L3 of the third plate, the length L4 of the fourth plate, the width w1 of the first plate, and the width w2 of the second plate satisfy: L1 / w1≥3.5, L1 / w2≥3.5, L2 / w1≥3.5, L2 / w2≥3.5, L3 / w1≥3.5, L3 / w2≥3.5, L4 / w1≥3.5, and L4 / w2≥3.5.

[0028] Secondly, this application also provides a battery cell, comprising:

[0029] The battery casing as described above;

[0030] A first end cap is disposed at the first opening of the battery casing;

[0031] The second end cap is disposed at the second opening of the battery casing;

[0032] The electrode assembly is disposed within the battery casing.

[0033] Thirdly, this application also provides a battery pack, comprising:

[0034] At least two battery cells arranged along the thickness direction as described above;

[0035] Two adjacent battery cells are in contact with each other, with the third and fourth plates serving as contact surfaces.

[0036] In some embodiments, the battery pack further includes a first liquid cooling plate that is in direct or indirect contact with at least two of the battery cells.

[0037] In some embodiments, the battery pack further includes a second liquid cooling plate that is in direct or indirect contact with at least two of the battery cells.

[0038] This application provides a battery casing comprising: a first plate; a second plate disposed opposite to the first plate; a third plate disposed between the first and second plates; and a fourth plate disposed between the first and second plates and opposite to the third plate. The first, second, third, and fourth plates form a hollow, open-end accommodating structure. The area of ​​the third plate is larger than that of the first plate, and the area of ​​the fourth plate is larger than that of the first plate, and the wall thickness of the first plate is greater than that of the third plate, and the wall thickness of the second plate is greater than that of the third plate, and the wall thickness of the second plate is greater than that of the fourth plate. Thus, by setting the wall thicknesses of the first and second plates to be greater than those of the third and fourth plates, this application strengthens the first and second plates, reduces deformation and bulging of the first and second plates, and improves the cooling effect of the battery cells.

[0039] After reading and understanding the accompanying diagrams and detailed descriptions, the other aspects can be understood. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 is a schematic diagram of the structure of the battery casing provided in an embodiment of this application;

[0042] Figure 2 is a schematic diagram of the first structure of the battery casing along the length direction provided in an embodiment of this application;

[0043] Figure 3 is a schematic diagram of the second structure of the battery casing along the length direction provided in the embodiment of this application;

[0044] Figure 4 is a schematic diagram of the exploded structure of a single battery cell provided in an embodiment of this application;

[0045] Figure 5 is a schematic diagram of the structure of a single battery cell provided in an embodiment of this application;

[0046] Figure 6 is a schematic diagram of the battery pack provided in an embodiment of this application.

[0047] Explanation of reference numerals in the attached figures:

[0048] 100 - Battery casing; 110 - First plate; 120 - Second plate; 130 - Third plate; 140 - Fourth plate; 200 - Single battery cell; 210 - Electrode assembly; 220 - End cap; 300 - Battery pack; 310 - First liquid cooling plate; 320 - Second liquid cooling plate; 330 - End plate; 340 - Base plate; X - Length direction; Y - Height direction; Z - Thickness direction. Embodiments of the present invention

[0049] 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 a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0050] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. In the description of this application, unless otherwise stated, "multiple" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist; for example, A and / or B can represent: A alone, A and B simultaneously, and B alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or devices.

[0051] Those skilled in the art will understand that the accompanying drawings are merely schematic diagrams of exemplary embodiments and may not be to scale. The modules or processes shown in the drawings are not necessarily essential for implementing this application and therefore should not be used to limit the scope of protection of this application.

[0052] The casing of a battery cell is distinguished by area, typically consisting of a large surface and a small surface. The large surface has a larger area than the small surface, and is generally placed with the large surface facing the small surface. Therefore, the large surface is under strong constraint and its strength requirements are not high. The small surface, however, is bonded to the base plate or liquid cooling plate by structural adhesive and is under weak constraint. When insufficient strength causes deformation of the small surface, the bond strength between the small surface and the structural adhesive decreases, leading to a decrease in the structural strength of the small surface. This further accelerates the deformation of the small surface, directly affecting the liquid cooling effect of the battery cell. Considering that the orientation of the two small surfaces is not fixed during battery cell placement, both small surfaces can be reinforced simultaneously to reduce assembly errors.

[0053] In view of this, this application provides a battery casing 100, which solves at least some of the above-mentioned technical problems by setting the wall thickness of the first plate 110 and the second plate 120 to be greater than the wall thickness of the third plate 130 and the fourth plate 140.

[0054] Please refer to Figures 1, 2 and 3. Figure 1 shows a schematic diagram of the structure of the battery casing provided in the embodiment of this application; Figure 2 shows a first schematic diagram of the battery casing provided in the embodiment of this application along the length direction; Figure 3 shows a second schematic diagram of the battery casing provided in the embodiment of this application along the length direction.

[0055] The battery casing 100 provided in this embodiment includes: a first plate 110, a second plate 120, a third plate 130, and a fourth plate 140. The second plate 120 is disposed opposite to the first plate 110; the third plate 130 is disposed between the first plate 110 and the second plate 120; and the fourth plate 140 is disposed between the first plate 110 and the second plate 120, and is disposed opposite to the third plate 130.

[0056] "Relative arrangement" refers to two components (i.e., the second plate 120 and the first plate 110, or the third plate 130 and the fourth plate 140) being in a face-to-face position in space, and their main planes being roughly parallel, together forming two opposing sides of a structure or space.

[0057] The fact that "the third plate 130 is disposed between the first plate 110 and the second plate 120" and "the fourth plate 140 is disposed between the first plate 110 and the second plate 120" means that the first plate 110 is connected to the second plate 120 through the third plate 130 and the fourth plate 140.

[0058] The first plate 110, the second plate 120, the third plate 130 and the fourth plate 140 are arranged to form an internally hollow, open-ended structure, with the two open ends being the first open end and the second open end, respectively.

[0059] The area of ​​the third plate 130 is larger than the area of ​​the first plate 110, and the area of ​​the third plate 130 is larger than the area of ​​the second plate 120. The area of ​​the fourth plate 140 is larger than the area of ​​the first plate 110, and the area of ​​the fourth plate 140 is larger than the area of ​​the second plate 120. In other words, the first plate 110 and the second plate 120 can be two small faces (side surfaces) of the battery casing. The third plate 130 and the fourth plate 140 can be two large faces of the battery casing. The "area" of each plate can refer to the area of ​​its outer surface.

[0060] The wall thickness of the first plate 110 is greater than the wall thickness of the third plate 130, and the wall thickness of the first plate 110 is greater than the wall thickness of the fourth plate 140. The wall thickness of the second plate 120 is greater than the wall thickness of the third plate 130, and the wall thickness of the second plate 120 is greater than the wall thickness of the fourth plate 140. Here, the "wall thickness" of each plate refers to the physical thickness of the plate-like structure formed by that plate.

[0061] The first plate 110 and the second plate 120 are small-area surfaces, while the third plate 130 and the fourth plate 140 are large-area surfaces. Furthermore, by setting the wall thickness of the first plate 110 and the second plate 120 to be greater than that of the third plate 130 and the fourth plate 140, this application strengthens the first plate 110 and the second plate 120, reduces deformation and bulging of the first plate 110 and the second plate 120, and improves the cooling effect of the battery cell 200.

[0062] The battery casing 100 of this application is configured as a double-through casing by means of the hollow interior and open ends of the first plate 110, the second plate 120, the third plate 130 and the fourth plate 140. Compared with a single-through casing with an opening on one side, the battery casing 100 of this application can significantly improve the internal space utilization of the battery cell 200.

[0063] As shown in Figure 2, in some embodiments, the width w1 and thickness t1 of the first plate 110 satisfy the following conditions: 40mm ≤ w1 ≤ 85mm, 0.5mm ≤ t1 ≤ 2mm, and 1.33% ≤ t1 / w1 ≤ 3.5%. Specifically, w1 can be any value or a range between any two values ​​from 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, 80mm, and 85mm. t1 can be any value or a range between any two values ​​from 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, and 1.9mm. t1 / w1 can be any value or a range between any two values ​​from 1.33%, 1.34%, 1.35%, 1.36%, 1.37%, 1.38%, 1.39%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2.0%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, 2.6%, 2.7%, 2.8%, 2.9%, 3.0%, 3.1%, 3.2%, 3.3%, 3.4%, and 3.5%. In this application, t1 is the minimum thickness of the first plate 110. Within the range of 1.33% to 3.5%, the smaller the t1 / w1, the smaller the thickness of the first plate 110; the larger the t1 / w1, the larger the thickness of the first plate 110. Within the above range, the strength of the first plate 110 can be guaranteed, and the corresponding battery casing 100 can maintain good contact with the first liquid cooling plate 310 or the second liquid cooling plate 320 through the first plate 110, so that the battery cell 200 can obtain a better cooling effect.

[0064] Wherein, the width w1 of the first plate 110 refers to the external dimension of the first plate 110 in the thickness direction (i.e., the Z direction) of the battery casing 100. The thickness t1 of the first plate 110 refers to the dimension of the material constituting the first plate 110 itself in the height direction (i.e., the Y direction) of the battery casing 100, that is, the wall thickness of the plate.

[0065] In some embodiments, the width w1 and thickness t1 of the first plate 110 further satisfy: 1.33% ≤ t1 / w1 ≤ 3%. Specifically, t1 / w1 can be any value or a range between any two values ​​from 1.33%, 1.34%, 1.35%, 1.36%, 1.37%, 1.38%, 1.39%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2.0%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, 2.6%, 2.7%, 2.8%, 2.9%, and 3.0%. As described above, the strength of the first plate 110 can be guaranteed within the range of 1.33% to 3.5%. With the increase of the thickness of the first plate 110, the first plate 110 occupies a larger space inside the battery cell 200, requires more material, and has a higher manufacturing cost. Therefore, this application can select 1.33%≤t1 / w1≤3%, thereby improving the strength of the first plate 110 while reducing the manufacturing cost of the first plate 110 and the battery cell 200.

[0066] In some embodiments, the width w2 of the second plate 120 and the thickness t2 of the second plate 120 satisfy: 40mm ≤ w2 ≤ 85mm, 0.5mm ≤ t2 ≤ 2mm, and 1.33% ≤ t2 / w2 ≤ 3.5%. Similarly, w2 can be any value or a range between any two values ​​from 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, 80mm, and 85mm. t2 can be any value or a range between any two values ​​from 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, and 1.9mm. t2 / w2 can be any value or a range between any two values ​​from 1.33%, 1.34%, 1.35%, 1.36%, 1.37%, 1.38%, 1.39%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2.0%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, 2.6%, 2.7%, 2.8%, 2.9%, 3.0%, 3.1%, 3.2%, 3.3%, 3.4%, and 3.5%. It should be noted that t2 in this application refers to the minimum thickness of the second plate 120. Within the range of 1.33% to 3.5%, the smaller the t2 / w2, the smaller the thickness of the second plate 120; the larger the t2 / w2, the larger the thickness of the second plate 120. Within the above range, the strength of the second plate 120 can be guaranteed, and the corresponding battery casing 100 can maintain good contact with the first liquid cooling plate 310 or the second liquid cooling plate 320 through the second plate 120, so that the battery cell 200 can obtain a better cooling effect.

[0067] Wherein, the width w2 of the second plate 120 refers to the external dimension of the second plate 120 in the thickness direction (i.e., the Z direction) of the battery casing 100. The thickness t2 of the second plate 120 refers to the dimension of the material constituting the second plate 120 itself in the height direction (i.e., the Y direction) of the battery casing 100, that is, the wall thickness of the plate.

[0068] In some embodiments, the width w2 and thickness t2 of the second plate 120 further satisfy: 1.33% ≤ t2 / w2 ≤ 3%. Specifically, t2 / w2 can be any value or a range between any two values ​​from 1.33%, 1.34%, 1.35%, 1.36%, 1.37%, 1.38%, 1.39%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2.0%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, 2.6%, 2.7%, 2.8%, 2.9%, and 3.0%. As mentioned above, the strength of the second plate 120 can be guaranteed within the range of 1.33% to 3.5%. With the increase of the thickness of the second plate 120, the second plate 120 occupies a larger space inside the battery cell 200, requires more material, and has a higher manufacturing cost. Therefore, this application can select 1.33%≤t2 / w2≤3%, thereby improving the strength of the second plate 120 while reducing the manufacturing cost of the second plate 120 and the battery cell 200.

[0069] Specifically, in this application, the influence of t1 / w1 and t2 / w2 on the strength of the battery casing 100 can be determined by deformation test. The gas production of the battery cell 200 at the end of its use period is set to be less than or equal to 0.35 MPa. The deformation of the first plate 110 and the second plate 120 corresponding to different ratios of t1 / w1 and t2 / w2 is judged to meet the cooling requirements of the battery cell 200.

[0070] Table 1

[0071]

[0072]

[0073] Table 2

[0074]

[0075]

[0076] As shown in Comparative Examples 1 to 20 in Tables 1 and 2 above, and Examples 1 to 44, when t1 / w1 and t2 / w2 are controlled within the range of 1.33% to 3.5%, the deformation of the first plate 110 and the second plate 120 within 0.35 MPa meets the cooling requirements of the battery cell 200. That is, the strength of the first plate 110 and the second plate 120 can be guaranteed, and the corresponding battery casing 100 can maintain good contact with at least one of the first liquid cooling plate 310 and the second liquid cooling plate 320 through at least one of the first plate 110 and the second plate 120, so that the battery cell 200 can obtain a better cooling effect.

[0077] As shown in Figure 3, in some embodiments, the thickness t3 of the third plate 130 satisfies: 0.25mm ≤ t3 ≤ 1mm. Specifically, t3 can be any value or a range between any two values ​​from 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, and 1mm. In this application, t3 is the minimum thickness of the third plate 130, which also refers to the material of the third plate 130 itself, in the thickness direction (i.e., the Z direction) of the battery casing 100, i.e., the wall thickness of the third plate 130. Thus, the wall thickness of the first plate 110 is greater than that of the third plate 130, and the wall thickness of the second plate 120 is also greater than that of the third plate 130. This makes the walls of the first plate 110 and the second plate 120 thicker, increasing the strength of the first plate 110 and the second plate 120, reducing the bulging of the first plate 110 and the second plate 120 under stress, maintaining the contact area with the first liquid cooling plate 310 or the second liquid cooling plate 320, and improving the heat dissipation effect of the battery cell 200 through the first plate 110 and the second plate 120.

[0078] In some embodiments, the thickness t4 of the fourth plate 140 satisfies: 0.25mm ≤ t4 ≤ 1mm. Specifically, t4 can be any value or a range between any two values ​​from 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, and 1mm. In this application, t4 is the minimum thickness of the fourth plate 140, which also refers to the material of the fourth plate 140 itself, in the thickness direction (i.e., the Z direction) of the battery casing 100, i.e., the wall thickness of the fourth plate 140. Thus, the wall thickness of the first plate 110 is greater than that of the fourth plate 140, and the wall thickness of the second plate 120 is also greater than that of the fourth plate 140. This makes the walls of the first plate 110 and the second plate 120 thicker, thereby increasing the strength of the first plate 110 and the second plate 120, reducing the bulging of the first plate 110 and the second plate 120 under stress, maintaining the contact area with the first liquid cooling plate 310 or the second liquid cooling plate 320, and improving the heat dissipation effect of the battery cell 200 through the first plate 110 and / or the second plate 120.

[0079] As shown in Figure 1, in some embodiments, the lengths L1 of the first plate 110, L2 of the second plate 120, L3 of the third plate 130, and L4 of the fourth plate 140 satisfy: L1 ≥ 300 mm, L2 ≥ 300 mm, L3 ≥ 300 mm, and L4 ≥ 300 mm. Specifically, the lengths L1 of the first plate 110, L2 of the second plate 120, L3 of the third plate 130, and L4 of the fourth plate 140 are the lengths of the battery casing 100. When the lengths L1, L2, L3, and L4 are greater than or equal to 300 mm, the battery casing 100 is a long casing. Compared to a single-sided casing, which has only one opening, the mold design and manufacturing process requires consideration of how to complete the complex internal structure forming and demolding within a limited opening, resulting in a complex mold structure, high manufacturing difficulty, and high cost. The battery casing 100 provided in this application is a double-opening casing with openings on both sides. This simplifies the design and manufacturing of the mold, reduces mold complexity and manufacturing costs, and improves production efficiency. Secondly, long casings are susceptible to various external forces during use, such as vibration and impact. Due to its double-opening design and reasonable plate structure, the battery casing 100 of this application allows for a more uniform distribution of external forces, reducing localized stress concentration and thus improving the structural strength and stability of the battery casing 100, reducing the risk of damage caused by external forces.

[0080] Wherein, L1, L2, L3 and L4 refer to the maximum external dimensions of the first plate 110, the second plate 120, the third plate 130 and the fourth plate 140 in the length direction, i.e., the X direction, of the battery casing 100, respectively.

[0081] In some embodiments, the width w1 and thickness t1 of the first plate 110 satisfy the following conditions: 12mm ≤ w1 ≤ 40mm, 0.5mm ≤ t1 ≤ 2mm, and 1.5% ≤ t1 / w1 ≤ 11.67%. Specifically, w1 can be any value or a range between any two values ​​from 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 25mm, 30mm, 35mm, 39mm, 39.5mm, 39.9mm, and 40mm. t1 can be any value or a range between any two values ​​from 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, and 2mm. t1 / w1 can be any value or a range between any two values ​​from 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2.0%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 11.2%, 11.4%, 11.6%, 11.61%, 11.62%, 11.63%, 11.64%, 11.65%, 11.66%, 11.67%. In this application, t1 is the minimum thickness of the first plate 110. Within the range of 1.5% to 11.67%, the smaller the t1 / w1, the smaller the thickness of the first plate 110; the larger the t1 / w1, the larger the thickness of the first plate 110. Within the above range, the strength of the first plate 110 can be guaranteed, and the corresponding battery casing 100 can maintain good contact with the first liquid cooling plate 310 or the second liquid cooling plate 320 through the first plate 110, so that the battery cell 200 can obtain a better cooling effect.

[0082] In some embodiments, the width w1 and thickness t1 of the first plate 110 further satisfy: 1.5% ≤ t1 / w1 ≤ 6%. Specifically, t1 / w1 can be any value from 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2.0%, 3%, 4%, 5%, and 6%, or a range between any two values. As mentioned above, the strength of the first plate 110 can be guaranteed within the range of 1.5% to 11.67%. As the thickness of the first plate 110 increases, the first plate 110 occupies a larger space inside the battery cell 200, requires more material, and increases the manufacturing cost. Therefore, this application can optionally use 1.5% ≤ t1 / w1 ≤ 6%, thereby improving the strength of the first plate 110 while reducing the manufacturing cost of the first plate 110 and the battery cell 200.

[0083] In some embodiments, the width w2 and thickness t2 of the second plate 120 satisfy the following conditions: 12mm ≤ w2 ≤ 40mm, 0.5mm ≤ t2 ≤ 2mm, and 1.5% ≤ t2 / w2 ≤ 11.67%. Similarly, w2 can be any value or a range between any two values ​​from 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 25mm, 30mm, 35mm, 39mm, 39.5mm, 39.9mm, and 40mm. t2 can be any value or a range between any two values ​​from 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, and 2mm. t2 / w2 can be any value or a range between any two values ​​from 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2.0%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 11.2%, 11.4%, 11.6%, 11.61%, 11.62%, 11.63%, 11.64%, 11.65%, 11.66%, and 11.67%. In this application, t2 is the minimum thickness of the second plate 120. Within the range of 1.5% to 11.67%, the smaller the t2 / w2, the smaller the thickness of the second plate 120; the larger the t2 / w2, the larger the thickness of the second plate 120. Within the above range, the strength of the second plate 120 can be guaranteed, and the corresponding battery casing 100 can maintain good contact with the first liquid cooling plate 310 or the second liquid cooling plate 320 through the second plate 120, so that the battery cell 200 can obtain a better cooling effect.

[0084] In some embodiments, the width w2 of the second plate 120 and the thickness t2 of the second plate 120 further satisfy: 1.5% ≤ t2 / w2 ≤ 6%. Specifically, t2 / w2 can be any value from 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2.0%, 3%, 4%, 5%, and 6%, or a range between any two values. As mentioned above, the strength of the second plate 120 can be guaranteed within the range of 1.5% to 11.67%. As the thickness of the second plate 120 increases, the second plate 120 occupies a larger space inside the battery cell 200, requires more material, and increases the manufacturing cost. Therefore, this application can optionally use 1.5% ≤ t2 / w2 ≤ 6%, thereby improving the strength of the second plate 120 while reducing the manufacturing cost of the second plate 120 and the battery cell 200.

[0085] Specifically, in this application, the influence of t1 / w1 and t2 / w2 on the strength of the battery casing 100 can be determined by deformation test. The gas production of the battery cell 200 at the end of its use period is set to be less than or equal to 0.35 MPa. The deformation of the first plate 110 and the second plate 120 corresponding to different ratios of t1 / w1 and t2 / w2 is judged to meet the cooling requirements of the battery cell 200.

[0086] Table 3

[0087]

[0088]

[0089] Table 4

[0090]

[0091] As shown in Comparative Examples 21 to 24 in Tables 3 and 4 above, and Examples 45 to 84, when t1 / w1 and t2 / w2 are controlled within the range of 1.5% to 11.67%, the deformation of the first plate 110 and the second plate 120 within 0.35 MPa meets the cooling requirements of the battery cell 200. That is, the strength of the first plate 110 and the second plate 120 can be guaranteed, and the corresponding battery casing 100 can maintain good contact with the first liquid cooling plate 310 and / or the second liquid cooling plate 320 through the first plate 110 and / or the second plate 120, so that the battery cell 200 can obtain a better cooling effect.

[0092] In some embodiments, the thickness t3 of the third plate 130 satisfies: 0.3mm ≤ t3 ≤ 0.65mm. Specifically, t3 can be any value or a range between any two of 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, and 0.65mm. In this application, t3 is the minimum thickness of the third plate 130. Thus, the wall thickness of the first plate 110 is greater than that of the third plate 130, and the wall thickness of the second plate 120 is also greater than that of the third plate 130. This increases the wall thickness of the first plate 110 and the second plate 120, improves their strength, reduces the bulging of the first plate 110 and the second plate 120 under stress, maintains the contact area with the first liquid cooling plate 310 or the second liquid cooling plate 320, and improves the heat dissipation effect of the battery cell 200 through the first plate 110 and the second plate 120.

[0093] In some embodiments, the thickness t4 of the fourth plate 140 satisfies: 0.3mm ≤ t4 ≤ 0.65mm. Specifically, t4 can be any value or a range between any two of 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, and 0.65mm. In this application, t4 is the minimum thickness of the fourth plate 140. Thus, the wall thickness of the first plate 110 is greater than that of the fourth plate 140, and the wall thickness of the second plate 120 is also greater than that of the fourth plate 140. This increases the wall thickness of the first plate 110 and the second plate 120, improves their strength, reduces the bulging of the first plate 110 and the second plate 120 under stress, maintains the contact area with the first liquid cooling plate 310 or the second liquid cooling plate 320, and improves the heat dissipation effect of the battery cell 200 through the first plate 110 and the second plate 120.

[0094] In some embodiments, the length L1 of the first plate 110, the length L2 of the second plate 120, the length L3 of the third plate 130, the length L4 of the fourth plate 140, the width w1 of the first plate 110, and the width w2 of the second plate 120 satisfy the following values: L1 / w1≥3.5, L1 / w2≥3.5, L2 / w1≥3.5, L2 / w2≥3.5, L3 / w1≥3.5, L3 / w2≥3.5, L4 / w1≥3.5, and L4 / w2≥3.5. Thus, the battery cell 200 has a long dimension, and the increased length also leads to an increased strength requirement for the battery cell 200. A single-channel battery casing 100 may not be able to meet the strength requirements of the battery cell 200, and the wall thickness of the first plate 110 and the second plate 120 also needs to be increased. Therefore, this application strengthens the first plate 110 and the second plate 120 by using a dual-pass battery casing 100 and setting the wall thickness of the first plate 110 and the second plate 120 to be greater than the wall thickness of the third plate 130 and the fourth plate 140, thereby reducing the deformation and bulging of the first plate 110 and the second plate 120 and improving the cooling effect of the battery cell 200.

[0095] In summary, by setting the wall thickness of the first plate 110 and the second plate 120 to be greater than the wall thickness of the third plate 130 and the fourth plate 140, this application strengthens the first plate 110 and the second plate 120, reduces the deformation and bulging of the first plate 110 and the second plate 120, and improves the cooling effect of the battery cell 200.

[0096] Accordingly, please refer to Figures 4 and 5. Figure 4 shows an exploded view of the battery cell provided in the embodiment of this application, and Figure 5 shows a structural view of the battery cell provided in the embodiment of this application.

[0097] This application also provides a battery cell, which includes a battery casing 100 as described in any of the above embodiments, a first end cap 220, a second end cap, and an electrode assembly 210. The first end cap 220 is disposed at a first opening of the battery casing 100; the second end cap is disposed at a second opening of the battery casing 100; and the electrode assembly 210 is disposed inside the battery casing 100. Thus, the battery cell 200 significantly improves the internal space utilization rate through the double-through battery casing 100.

[0098] It is understood that the battery cell 200 provided in this application embodiment includes all the technical features and effects of the battery casing 100 described above, and will not be repeated here.

[0099] Please refer to Figure 6, which illustrates the structural diagram of the battery pack provided in the embodiment of this application.

[0100] Accordingly, this application also provides a battery pack 300, which includes at least two battery cells 200 arranged along the thickness direction Z as described above; two adjacent battery cells 200 are in contact with each other. The third plate 130 and the fourth plate 140 serve as contact surfaces. Since the first plate 110 and the second plate 120 are small surfaces with relatively small areas, the third plate 130 and the fourth plate 140 are large surfaces with relatively large areas. Thus, two adjacent battery cells 200 are in contact through two large surfaces in the battery casing 100. For example, the third plate 130 of one battery cell 200 is in contact with the fourth plate 140 or the third plate 130 of another adjacent battery cell 200, and a strong constraint is formed between the two contacting large surfaces.

[0101] In some embodiments, the battery pack 300 further includes a first liquid cooling plate 310, which is in direct or indirect contact with at least two battery cells. Specifically, the first plate 110 or the second plate 120 can be in direct contact with the first liquid cooling plate 310, or a heat-conducting medium or a buffer medium can be added between them to achieve indirect contact. Thus, by setting the wall thickness of the first plate 110 and the second plate 120 to be greater than the wall thickness of the third plate 130 and the fourth plate 140, this application strengthens the first plate 110 and the second plate 120, reduces the deformation and bulging of the first plate 110 and the second plate 120, and allows the first plate 110 or the second plate 120 to maintain effective contact with the first liquid cooling plate 310. Therefore, the battery cell 200 can contact the liquid cooling plate on one side only, improving the cooling effect of the battery cell 200.

[0102] In some embodiments, the battery pack 300 further includes a second liquid cooling plate 320, which is in direct or indirect contact with at least two battery cells. Specifically, the first plate 110 or the second plate 120 can be in direct contact with the second liquid cooling plate 320, or a thermally conductive medium or a buffer medium can be added between them to achieve indirect contact. Thus, this application sets the wall thickness of the first plate 110 to be greater than the wall thickness of the third plate 130 and the fourth plate 140, and sets the wall thickness of the second plate 120 to be greater than the wall thickness of the third plate 130 and the fourth plate 140. This strengthens the first plate 110 and the second plate 120, reduces the deformation and bulging of the first plate 110 and the second plate 120, and ensures that the first plate 110 or the second plate 120 can maintain effective contact with the first liquid cooling plate 310 and the second liquid cooling plate 320. In other words, the battery cell 200 can contact the liquid cooling plate on both sides, thereby improving the cooling effect of the battery cell 200.

[0103] In some embodiments, the battery pack 300 further includes at least one end plate 330, which is disposed abutting against at least one of the third plate 130 and the fourth plate 140. The battery pack 300 also includes a base plate 340, on which the second liquid cooling plate 320 and the end plate 330 are disposed. Thus, the end plate 330 provides support for at least one of the third plate 130 and the fourth plate 140. When the battery pack 300 is subjected to external impact, vibration, or expansion of individual battery cells, the end plate 330 can limit the lateral deformation of the battery pack 300. Furthermore, the base plate 340, as the bottom support structure of the entire battery pack 300, cooperates with the end plate 330 to provide bottom support and fixation for the battery pack 300, further improving the safety and stability of the battery pack.

[0104] The battery pack 300 of this application is used to store and release electrical energy. The battery pack 300 can be a charging and discharging structure composed of multiple battery cells, such as a battery module, battery pack, battery cluster, battery stack, battery tower, or battery array. The battery cells include, but are not limited to, lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc. The embodiments disclosed herein do not limit the types of batteries.

[0105] It is understood that, compared with the prior art, the battery pack 300 provided in this application embodiment includes all the technical features and technical effects of the above-mentioned battery cells, which will not be repeated here.

[0106] Accordingly, this application also provides an electrical device, including a battery pack 300 as described in the above embodiment. This electrical device can be various types of equipment such as new energy vehicles, computers, and energy storage power supply devices.

[0107] It is understood that, compared with the prior art, the electrical equipment provided in this application embodiment includes all the technical features and technical effects of the battery pack 300 described above, and will not be repeated here.

[0108] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0109] The battery casing, battery cell, and battery pack provided in the embodiments of this application have been described in detail above, and specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery casing, comprising: First plate; The second plate is disposed opposite to the first plate. The third plate is disposed between the first plate and the second plate; The fourth plate is disposed between the first plate and the second plate, and is disposed opposite to the third plate; The first plate, the second plate, the third plate, and the fourth plate are arranged to form a hollow, open-end accommodating structure; the area of ​​the third plate is greater than the area of ​​the first plate, and the area of ​​the third plate is greater than the area of ​​the second plate; the area of ​​the fourth plate is greater than the area of ​​the first plate, and the area of ​​the fourth plate is greater than the area of ​​the second plate. The wall thickness of the first plate is greater than the wall thickness of the third plate, and the wall thickness of the first plate is greater than the wall thickness of the fourth plate; the wall thickness of the second plate is greater than the wall thickness of the third plate, and the wall thickness of the second plate is greater than the wall thickness of the fourth plate.

2. The battery casing according to claim 1, wherein, The width w1 and the thickness t1 of the first plate satisfy: 40mm≤w1≤85mm, 0.5mm≤t1≤2mm, and 1.33%≤t1 / w1≤3.5%.

3. The battery casing according to claim 2, wherein, The width w1 and the thickness t1 of the first plate also satisfy: 1.33%≤t1 / w1≤3%.

4. The battery casing according to claim 1, wherein, The width w2 and the thickness t2 of the second plate satisfy: 40mm≤w2≤85mm, 0.5mm≤t2≤2mm, and 1.33%≤t2 / w2≤3.5%.

5. The battery casing according to claim 4, wherein, The width w2 and the thickness t2 of the second plate also satisfy: 1.33%≤t2 / w2≤3%.

6. The battery casing according to any one of claims 1 to 5, wherein, The thickness t3 of the third plate satisfies: 0.25mm≤t3≤1mm.

7. The battery casing according to any one of claims 1 to 5, wherein, The thickness t4 of the fourth plate satisfies: 0.25mm≤t4≤1mm.

8. The battery casing according to claim 1, wherein, The lengths L1 of the first plate, L2 of the second plate, L3 of the third plate, and L4 of the fourth plate satisfy the following: L1≥300mm, L2≥300mm, L3≥300mm, L4≥300mm.

9. The battery casing according to claim 1, wherein, The width w1 and the thickness t1 of the first plate satisfy: 12mm≤w1<40mm, 0.5mm≤t1≤2mm, and 1.5%≤t1 / w1≤11.67%.

10. The battery casing according to claim 9, wherein, The width w1 and the thickness t1 of the first plate also satisfy: 1.5%≤t1 / w1≤6%.

11. The battery casing according to claim 1, wherein, The width w2 and the thickness t2 of the second plate satisfy: 12mm≤w2<40mm, 0.5mm≤t2≤2mm, and 1.5%≤t2 / w2≤11.67%.

12. The battery casing according to claim 11, wherein, The width w2 and the thickness t2 of the second plate also satisfy: 1.5%≤t2 / w2≤6%.

13. The battery casing according to any one of claims 9 to 12, wherein, The thickness t3 of the third plate satisfies: 0.3mm≤t3≤0.65mm.

14. The battery casing according to any one of claims 9 to 12, wherein, The thickness t4 of the fourth plate satisfies: 0.3mm≤t4≤0.65mm.

15. The battery casing according to claim 1, wherein, The lengths L1 of the first plate, L2 of the second plate, L3 of the third plate, L4 of the fourth plate, the widths w1 of the first plate, and w2 of the second plate satisfy the following: L1 / w1≥3.5, L1 / w2≥3.5, L2 / w1≥3.5, L2 / w2≥3.5, L3 / w1≥3.5, L3 / w2≥3.5, L4 / w1≥3.5, and L4 / w2≥3.

5.

16. A single battery cell, comprising: The battery casing as described in any one of claims 1 to 15; A first end cap is disposed at the first opening of the battery casing; The second end cap is disposed at the second opening of the battery casing; The electrode assembly is disposed within the battery casing.

17. A battery pack, comprising: At least two battery cells as described in claim 16 are arranged along the thickness direction; Two adjacent battery cells are in contact with each other, with the third and fourth plates serving as contact surfaces.

18. The battery pack according to claim 17, wherein, The battery pack also includes: The first liquid cooling plate is in direct or indirect contact with at least two of the battery cells.

19. The battery pack according to claim 17 or 18, wherein, The battery pack also includes: The second liquid cooling plate is in direct or indirect contact with at least two of the battery cells.

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