Battery cell shell and single battery
By adopting eccentric welding on the battery cell shell, the problem of deformation and bursting of the welding position under pressure is solved, and the structural stability and safety of the battery cell shell are improved.
Patent Information
- Application Number
- CN202422175762.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-04
- Publication Date
- 2025-08-01
- Estimated Expiration
- 2034-09-04
AI Technical Summary
The welding position of the single cell is easily deformed and burst under the action of internal pressure, affecting battery safety.
Eccentric welding is adopted to make the welding print deviate from the center of the surface of the battery cell shell. By welding on a plate with a smaller area, the pressure at the welding position is reduced and the structural stability is improved.
Effectively reduce the pressure at the welding position, improve the structural stability of the battery cell shell, and ensure the safety of the single battery.
Smart Images
Figure CN223181230U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the technical field of batteries, and particularly relates to a battery cell housing and a single battery. Background Art
[0002] During the production process of the outer shell of a single battery, welding is required. However, the welding position is prone to deformation under the pressure inside the single battery, which may then lead to bursting and affect the safety of the single battery. Summary of the Utility Model
[0003] Object of this application: This application provides a battery cell housing to solve the problem that the welding position is prone to deformation under the pressure inside the single battery, which may then lead to bursting and affect the safety of the single battery; this application also provides a single battery.
[0004] Technical solution: This application provides a battery cell housing, including:
[0005] A first plate body;
[0006] A second plate body disposed adjacent to the first plate body; the first plate body has an extension portion extending towards the second plate body, and the extension portion is welded to the second plate body to form a surface of the battery cell housing; wherein, a welding mark is formed at the position where the extension portion is welded to the second plate body, and the welding mark deviates from the center of the surface;
[0007] A third plate body, connected to the side of the second plate body away from the first plate body;
[0008] A fourth plate body, connected to the side of the third plate body away from the second plate body, and the fourth plate body is connected to the side of the first plate body away from the second plate body.
[0009] In some embodiments, the second plate body has a first dimension D1, and there is a second dimension D2 between the welding mark and the first plate body that is closer to the welding mark among the two first plate bodies. The battery cell housing satisfies:
[0010] 0.08% ≤ D2 / D1 ≤ 30%.
[0011] In some embodiments, the area of the first plate body is larger than the area of the second plate body.
[0012] In some embodiments, the battery cell housing is a bendable metal sheet, and after the metal sheet is bent, the head and tail are welded to form the first plate body, the second plate body, and the welding mark.
[0013] In some embodiments, the welding mark has a third dimension D3, and the battery cell housing satisfies:
[0014] 2 mm ≤ D3 ≤ 3 mm.
[0015] In some embodiments, the welding mark has a fourth dimension D4, and the cell housing satisfies:
[0016] 0.5 mm ≤ D4 ≤ 0.8 mm.
[0017] In some embodiments, the second dimension D2 is greater than a preset welding distance.
[0018] In some embodiments, the cell housing satisfies:
[0019] D2 ≥ 10 mm; and / or,
[0020] D1 / 2 - D2 ≥ 10 mm.
[0021] In some embodiments, the metal sheet is an aluminum sheet.
[0022] Correspondingly, the present application further provides a single cell, including the cell housing according to any one of the above embodiments.
[0023] Beneficial effects: Compared with the prior art, a cell housing provided in an embodiment of the present application includes: a first plate body; a second plate body disposed adjacent to the first plate body; the first plate body has an extension portion extending toward the second plate body, and the extension portion is welded to the second plate body to form a surface of the cell housing; wherein, a welding mark is formed at the position where the extension portion is welded to the second plate body, and the welding mark deviates from the center of the surface; a third plate body, connected to a side of the second plate body away from the first plate body; a fourth plate body, connected to a side of the third plate body away from the second plate body, and the fourth plate body is connected to a side of the first plate body away from the second plate body. In this way, by performing eccentric welding on the extension portion and the second plate body, the position where the maximum pressure is borne on the surface formed after welding the second plate body and the extension portion is not on the welding mark, reducing the pressure borne at the welding mark, improving the structural stability of the cell housing, and ensuring the safety of the single cell.
[0024] It can be understood that, compared with the prior art, a single cell provided in an embodiment of the present application includes all the technical features and technical effects of the above cell housing, which will not be elaborated herein. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] The following will make the technical solutions and other beneficial effects of the present application obvious by describing the specific embodiments of the present application in detail with reference to the drawings.
[0026] Figure 1 is a schematic structural diagram of the cell housing provided in an embodiment of the present application;
[0027] Figure 2 is Figure 1 a partial enlarged schematic diagram of area A in
[0028] Figure 3 It is a top view of the battery cell housing provided by the embodiment of the present application;
[0029] Figure 4 It is Figure 3 a partial enlarged schematic view of area B in
[0030] Figure 5 It is the first schematic diagram of the housing bending of the battery cell housing provided by the embodiment of the present application;
[0031] Figure 6 It is the second schematic diagram of the housing bending of the battery cell housing provided by the embodiment of the present application.
[0032] Reference numerals: 10 - surface; 11 - first plate body; 111 - extension part; 12 - second plate body; 13 - third plate body; 14 - fourth plate body; 20 - accommodation cavity; 30 - welding mark; X - first direction; Y - second direction; Z - third direction. Detailed implementation manners
[0033] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the 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 skilled in the art without creative efforts fall within the protection scope of the present application.
[0034] In the description of the present application, it should be noted that unless otherwise clearly defined and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, and can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations. In the description of the present application, "a plurality" means two or more unless otherwise clearly and specifically limited. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood 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 features.
[0035] The following disclosure provides many different implementation manners or examples to implement different structures of the present application. To simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present application.
[0036] An embodiment of the present application provides an electric cell housing. Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 . Figure 1 shows a schematic structural diagram of the electric cell housing provided by the embodiment of the present application; Figure 2 shows Figure 1 a partial enlarged schematic diagram of area A in Figure 3 shows a top view of the electric cell housing provided by the embodiment of the present application; Figure 4 shows Figure 3 a partial enlarged schematic diagram of area B in
[0037] Please refer to Figures 1 to 4 again. The electric cell housing provided by the embodiment of the present application includes: a first plate body 11; a second plate body 12 disposed adjacent to the first plate body 11; the first plate body 11 has an extension portion 111 extending toward the second plate body 12, and the extension portion 111 is welded to the second plate body 12 to form a surface 10 of the electric cell housing; wherein, a welding mark 30 is formed at the position where the extension portion 111 is welded to the second plate body 12, and the welding mark 30 deviates from the center of the surface 10; a third plate body 13, connected to a side of the second plate body 12 away from the first plate body 11; a fourth plate body 14, connected to a side of the third plate body 13 away from the second plate body 12, and the fourth plate body 14 is connected to a side of the first plate body 11 away from the second plate body 12. It should be noted that the center of the surface 10 in the present application refers to the center line of the surface 10 along the third direction Z. Specifically, in the electric cell housing of the present application, the electric cell housing is composed of a first plate body 11, a second plate body 12, a third plate body 13, and a fourth plate body 14, and the first plate body 11, the second plate body 12, the third plate body 13, and the fourth plate body 14 enclose a receiving cavity 20, and the electric cell assembly (not shown in the figure) of the single cell is disposed in the receiving cavity 20. When the electric cell assembly undergoes thermal runaway, the generated high-temperature gas will impact the first plate body 11, the second plate body 12, the third plate body 13, and the fourth plate body 14. Since the first plate body 11, the second plate body 12, the third plate body 13, and the fourth plate body 14 are of an integral structure, their impact resistance is relatively strong. And the welding mark 30 is the position of welded connection on the surface 10. Therefore, after being impacted by the high-temperature gas, the position of the welding mark 30 is more likely to break, resulting in a risk of explosion of the electric cell housing. And the applicant found in the safety test of the electric cell housing that on the entire surface 10, the pressure of the high-temperature gas borne by the center position of the surface 10 is the largest. Therefore, the welding on the surface 10 in the present application is eccentric welding deviating from the center position. By performing eccentric welding on the electric cell housing through the welding mark 30 on the surface 10, the position where the surface 10 bears the maximum pressure is not on the welding mark 30, reducing the pressure borne by the welding mark 30, improving the structural stability of the electric cell housing, and ensuring the safety of the electric cell housing., in some embodiments, in the first direction X, the second plate body 12 has a first dimension D1, and there is a second dimension D2 between the welding mark 30 and the first plate body 11 that is closer to the two first plate bodies 11 among the two first plate bodies 11. The cell housing satisfies: 0.08% ≤ D2 / D1 ≤ 30%. Specifically, D2 / D1 can be any value among 0.08%, 0.09%, 0.1%, 0.11%, 0.12%, 0.13%, 0.14%, 0.15%, 0.16%, 0.17%, 0.18%, 0.19%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30% or the range value between any two values. In the embodiments of the present application, when 0.08% ≤ D2 / D1 ≤ 30% is satisfied, the minimum value of 0.08% represents the minimum distance between the welding mark 30 and the first plate body 11 that is closer to the two first plate bodies 11 among the two first plate bodies 11. It can also be understood as the minimum distance between the welding mark 30 and the edge of the second plate body 12 on the second plate body 12, so as to avoid the welding mark 30 being arranged at the corner position where the first plate body 11 and the second plate body 12 are joined, and avoid the rupture of the welding mark 30 caused by stress concentration at the corner position. In the present application, the central position of the second plate body 12 refers to the center line of the second plate body 12 along the third direction Z. Setting the maximum value of 30% represents the minimum distance between the welding mark 30 and the center line, so as to avoid the welding mark 30 approaching the center line of the second plate body 12, reduce the pressure on the welding mark 30, improve the structural stability of the welding mark 30, and ensure the safety of the cell housing and the single cell.
[0038] It can be understood that when specifically measuring the first dimension D1, the second plate body 12 can be directly clamped along the first direction X by a vernier caliper for measurement; the second dimension D2 can be directly obtained by measuring the distance between the welding mark 30 and the first plate body 11 that is closer to the two first plate bodies 11 among the two first plate bodies 11 by a caliper.
[0039] Please refer to again Figures 1 to 4, in some embodiments, the area of the first plate body 11 is larger than that of the second plate body 12. Specifically, when the thermal runaway of the battery cell assembly occurs, the high-temperature gas generated will impact the first plate body 11 and the second plate body 12. At this time, since the area of the first plate body 11 is larger than that of the second plate body 12, the impact force received by the first plate body 11 is stronger, and the impact force received by the second plate body 12 is slightly weaker. At the same time, since the pressure of the high-temperature gas is the greatest at the central position of the second plate body 12 throughout the second plate body 12, in this application, the position of the eccentric welding is set on the second plate body 12, thereby further reducing the pressure borne at the weld mark 30, improving the structural stability of the battery cell housing, and ensuring the safety of the battery cell housing and the single battery.
[0040] Please refer to Figure 5 and Figure 6 , Figure 5 shows the first schematic diagram of the housing bending of the battery cell housing provided by the embodiment of the present application; Figure 6 shows the second schematic diagram of the housing bending of the battery cell housing provided by the embodiment of the present application. In some embodiments, the battery cell housing is a bendable metal sheet, and after the metal sheet is bent, the head and tail are welded to form the first plate body 11, the second plate body 12, and the weld mark 30. Specifically, the bendable metal sheet can be bent according to the specific needs of the battery cell housing to adapt to different shapes and size designs of the battery cell housing. At the same time, the bending and head-tail welding of the metal sheet make the battery cell housing more solid, with higher strength and stability, to protect the battery cell housing from external impacts and squeezes, improve the anti-drop and anti-deformation capabilities of the battery cell housing, and enhance the durability and stability of the battery cell housing. As Figure 5 shown, in the present application, after the metal sheet is bent, two first plate bodies 11, a complete second plate body 12, and an incomplete second plate body 12 are first formed. Then as Figure 6 shown, the metal sheet is welded at the head and tail to form another complete second plate body 12, and a weld mark 30 is formed on the second plate body 12 after welding. Therefore, the first plate body 11 and the second plate body 12 in the present application are integral structures, and there is only one connection point at the weld mark 30. After being impacted by high-temperature gas, the position of the weld mark 30 is more likely to break, resulting in a risk of explosion of the battery cell housing. For this reason, in this application, the eccentric welding of the entire battery cell housing is selected on the second plate body 12 with a smaller area to reduce the pressure borne at the weld mark 30, improve the structural stability of the battery cell housing, and ensure the safety of the battery cell housing and the single battery.
[0041] In some embodiments, along the first direction X, the welding mark 30 has a third dimension D3, and the cell housing satisfies: 2 mm ≤ D3 ≤ 3 mm. Specifically, D3 is the width of the welding mark 30 along the first direction X, which can be directly measured by a caliper to obtain the width of the welding mark 30 along the first direction X, or the welding mark 30 can be directly clamped along the first direction X by a vernier caliper for measurement. D3 can be any value among 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3 or a range value between any two values. In this way, setting the minimum value provides a more stable welding connection by keeping the welding mark 30 at an appropriate width. At the same time, setting the maximum value avoids the width of the welding mark 30 being too large to occupy the area of the second plate body . It can be understood that when 2 mm ≤ D3 ≤ 3 mm is satisfied, the greater the width of the welding mark 30, the higher the welding strength, stability, and reliability on the second plate body 12.
[0042] In some embodiments, along the second direction Y, the welding mark 30 has a fourth dimension D4, and the cell housing satisfies: 0.5 mm ≤ D4 ≤ 0.8 mm. Specifically, D4 is the depth of the welding mark 30 along the second direction Y, which can be directly measured by a caliper to obtain the depth of the welding mark 30 along the second direction Y, or the welding mark 30 can be directly clamped along the second direction Y by a vernier caliper for measurement. D4 can be any value among 0.5, 0.6, 0.7, 0.8 or a range value between any two values. Since the depth of the welding mark 30 determines the occupation of the internal space of the cell housing by the welding point, by controlling the depth of the welding mark 30, while minimizing the occupation of the cell housing space by the welding point as much as possible, sufficient welding contact area can still be maintained, thereby maximizing the utilization of the internal space of the cell housing. In addition, an appropriate depth of the welding mark 30 can prevent the welding point from being too deep, resulting in a short circuit between welding points or a collision with other cell housing components. At the same time, a suitable depth of the welding mark 30 can also avoid excessive damage or deformation of the cell housing during the welding process.
[0043] In some embodiments, the second dimension D2 is greater than a preset welding distance. In the embodiments of the present application, a welding press head (not shown in the figure) is required for welding the cell housing, and the preset welding distance is the minimum working distance of the welding press head to ensure the normal operation of the welding press head to achieve the welding of the cell housing, ensuring the stability and reliability during the welding process, thereby improving the welding quality and ensuring the reliability and durability of the welding connection.
[0044] In some embodiments, the cell housing satisfies: D2≥10mm; and / or, D1 / 2 - D2≥10mm. In this way, the second dimension D2 between the welding mark 30 and the closer first plate body 11 among the two first plate bodies 11 is greater than or equal to 10mm, so as to reserve sufficient working distance for the welding head and ensure the reliability of the cell housing welding. In addition, D1 / 2 - D2 is the distance between the welding mark 30 and the center line of the second plate body 12. When the cell housing satisfies D1 / 2 - D2≥10mm, sufficient working distance can also be reserved for the welding head to ensure the reliability of the cell housing welding.
[0045] In some embodiments, the metal sheet is an aluminum sheet. In this way, the cell housing is formed by bending an aluminum sheet, making the weight of the cell housing lighter, thereby reducing the weight of the cell housing and increasing the energy density of the cell housing. Secondly, aluminum has good thermal conductivity and can effectively conduct and dissipate heat. Using an aluminum sheet as the cell housing helps the cell housing to effectively dissipate heat, reduce the temperature of the cell housing, prevent overheating and thermal runaway, and improve the safety and lifespan of the cell housing and the single cell battery. At the same time, aluminum has good corrosion resistance and can resist the corrosion of humidity, moisture and some chemical substances to a certain extent, so as to improve the durability and stability of the cell housing and reduce the risk of damage and performance degradation of the cell housing caused by external environmental corrosion. In addition, aluminum is a recyclable material with good reusability. Using an aluminum sheet as the cell housing helps the cell housing to be recycled and reused after the end of its service life, reduce the impact on the environment, and promote sustainable development.
[0046] This application tests the effect of eccentric welding of the cell housing through the pressure-bearing test of the cell housing.
[0047] The test process of the embodiment is as follows: Seal the two ends of the cell housing along the third direction Z with a cover plate welded around, and reserve a vent hole on the cover plate at one end; Place the sealed cell housing in the tooling groove and fix it, insert the ventilation pipe into the vent hole, and introduce gas into the interior of the cell housing until the pressure inside the cell housing reaches a preset value, for example, 1.5 Mpa. The test results show that when the pressure inside the cell housing of this application reaches 1.5 Mpa, no burst occurs at the welding mark 30.
[0048] The test process of the comparative example is as follows: Repeat the above test after replacing the cell housing with a non-eccentrically welded cell housing. The test results show that the welded part of the cell housing of the comparative example bursts when the internal pressure reaches 1.5 Mpa.
[0049] It can be seen that this application performs eccentric welding of the cell housing on the surface 10, reduces the pressure borne at the welding mark 30, improves the structural stability of the cell housing, and ensures the safety of the cell housing.
[0050] Correspondingly, the present application also provides a single cell, including the cell housing as described in any one of the above embodiments.
[0051] It can be understood that, compared with the prior art, the single cell provided by the embodiment of the present application includes all the technical features and technical effects of the above cell housing, which will not be elaborated herein.
[0052] Correspondingly, the present application also provides an electrical device, including the single cell as described in any one of the above embodiments. The electrical device can be various types of devices such as new energy vehicles, computers, energy storage power supply devices, etc.
[0053] Correspondingly, the present application also provides a battery module, including the single cell as described in any one of the above embodiments.
[0054] Correspondingly, the present application also provides a battery pack, including the single cell as described in any one of the above embodiments.
[0055] Correspondingly, the present application also provides an energy storage system, including the single cell as described in any one of the above embodiments.
[0056] It can be understood that, compared with the prior art, an electrical device, a battery module, a battery pack or an energy storage system provided by the embodiment of the present application includes all the technical features and technical effects of the above single cell, which will not be elaborated herein.
[0057] The above has introduced in detail a cell housing and a single cell provided by the embodiments of the present application. Specific examples are used in the present application to elaborate the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of the present application; those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.
Claims
1. A battery cell housing, characterized in that, Comprising: A first plate body (11); A second plate body (12) disposed adjacent to the first plate body (11); the first plate body (11) has an extension portion (111) extending towards the second plate body (12), and the extension portion (111) is welded to the second plate body (12) to form a surface (10) of the battery cell housing; wherein, a welding mark (30) is formed at the position where the extension portion (111) is welded to the second plate body (12), and the welding mark (30) deviates from the center of the surface (10); A third plate body (13) connected to a side of the second plate body (12) away from the first plate body (11); A fourth plate body (14) connected to a side of the third plate body (13) away from the second plate body (12), and the fourth plate body (14) is connected to a side of the first plate body (11) away from the second plate body (12).
2. The cell housing according to claim 1, wherein, The second plate body (12) has a first dimension D1, and there is a second dimension D2 between the welding mark (30) and the first plate body (11) that is closer among the two first plate bodies (11), and the battery cell housing satisfies: 0.08% ≤ D2 / D1 ≤ 30%.
3. The cell housing according to claim 1, characterized in that, The area of the first plate body (11) is larger than the area of the second plate body (12).
4. The cell housing according to claim 1, wherein The battery cell housing is a bendable metal sheet, and after the metal sheet is bent, the head and tail are welded to form the first plate body (11), the second plate body (12) and the welding mark (30).
5. The cell housing according to claim 1, characterized in that, The welding mark (30) has a third dimension D3, and the battery cell housing satisfies: 2 mm ≤ D3 ≤ 3 mm.
6. The cell housing according to claim 1, characterized in that, The welding mark (30) has a fourth dimension D4, and the battery cell housing satisfies: 0.5 mm ≤ D4 ≤ 0.8 mm.
7. The cell housing according to claim 2, characterized in that, The second dimension D2 is greater than a preset welding distance.
8. The cell housing according to claim 7, wherein, The battery cell housing satisfies: D2 ≥ 10 mm; and / or, D1 / 2 - D2 ≥ 10 mm.
9. The cell housing according to claim 4, wherein The metal sheet is an aluminum sheet.
10. A single cell, characterized in that, Comprising the battery cell housing according to any one of claims 1 to 9.