Battery shell and battery cell

Abstract

One embodiment of the present disclosure relates to a battery case and a battery cell, the battery case according to one embodiment comprising: a case body having an opening in which an electrode assembly is accommodated; the cover plate is inserted into the opening part; and a protruding portion into which the cover plate is inserted, and which protrudes further in an outer direction than other regions of the housing main body.

Description

Technical Field

[0001] This disclosure relates to a battery casing and a battery cell, specifically, to a battery casing and a battery cell with excellent stability. Background Technology

[0002] A rechargeable battery is a type of battery that converts electrical energy into chemical energy and stores it, allowing it to be reused multiple times through charging and discharging. Rechargeable batteries are widely used across various industries due to their economic and environmentally friendly characteristics. In particular, lithium-ion batteries are widely used in various industries, including portable devices requiring high-density energy.

[0003] The working principle of a lithium-ion rechargeable battery is an electrochemical redox reaction. That is, it's a principle that generates electricity through the movement of lithium ions, and charges through the reverse process. In a lithium-ion rechargeable battery, the phenomenon of lithium ions escaping from the negative electrode (Anode) and moving to the positive electrode (Cathode) through the electrolyte and separator is called discharging. The process that is the reverse of this phenomenon is called charging.

[0004] Secondary batteries are manufactured by assembling multiple components, particularly the electrode assembly and electrolyte housed within a casing. The casing's seal is a crucial factor determining the performance of a secondary battery; therefore, much research is underway to improve this seal. Summary of the Invention

[0005] (a) Technical problems to be solved

[0006] One embodiment of this disclosure provides a battery casing and a battery cell with excellent stability.

[0007] One embodiment of this disclosure provides a battery casing and a battery cell with excellent sealing performance.

[0008] One embodiment of this disclosure provides a battery casing and cell that prevent electrolyte leakage.

[0009] On the other hand, the battery casing and cells disclosed herein can be widely used in electric vehicles, battery charging stations, energy storage systems (ESS), and other green technologies such as solar power generation and wind power generation that utilize batteries. Furthermore, the battery components disclosed herein can be used to prevent climate change by suppressing air pollution and greenhouse gas emissions, including in eco-friendly mobility vehicles such as electric vehicles and hybrid vehicles.

[0010] (II) Technical Solution

[0011] One embodiment of this disclosure provides a battery housing, comprising: a housing body having an opening in which an electrode assembly is received; a cover plate inserted into the opening; and a protrusion into which the cover plate is inserted, and the protrusion protruding further outward than other areas of the housing body.

[0012] In one embodiment, the width W2 of the cover plate may be greater than the width W1 of the opening.

[0013] In one embodiment, the protrusion may protrude beyond the difference (W2-W1) between the width W2 of the cover plate and the width W1 of the opening.

[0014] In one embodiment, the thickness of other areas of the housing body and the thickness of the housing body at the protrusion may be the same.

[0015] In one embodiment, the cover plate may include an insertion area, the width of which is smaller than the width of the opening.

[0016] In one embodiment, the protrusion may be formed in the length direction and / or width direction of the housing body.

[0017] In one embodiment, the housing body may be prismatic or cylindrical.

[0018] In one embodiment, the housing body may be cylindrical, and the outer diameter of the cover plate may be larger than the inner diameter of the opening.

[0019] One embodiment of this disclosure provides a battery cell that may include: a housing body having an opening in which an electrode assembly is received; the electrode assembly being received in the housing body; a cover plate inserted into the opening; and a protrusion into which the cover plate is inserted, and the protrusion protruding further outward than other areas of the housing body.

[0020] In one embodiment, the width W2 of the cover plate may be greater than the width W1 of the opening.

[0021] In one embodiment, the thickness of other areas of the housing body and the thickness of the housing body at the protrusion may be the same.

[0022] In one embodiment, the housing body and the cover plate can be sealed by welding.

[0023] (III) Beneficial Effects

[0024] One embodiment of this disclosure provides a battery casing and cell with excellent stability.

[0025] One embodiment of this disclosure provides a battery casing and cell with excellent sealing performance.

[0026] One embodiment of this disclosure provides a battery casing and cell that prevent electrolyte leakage. Attached Figure Description

[0027] Figure 1 This is a schematic perspective view of a battery casing according to one embodiment of the present disclosure.

[0028] Figure 2 This is a schematic diagram showing a portion of a battery casing according to one embodiment of the present disclosure.

[0029] Figure 3 and Figure 4 This is a diagram schematically illustrating the assembly process of a battery cell according to an embodiment of the present disclosure.

[0030] Figure 5 This is a diagram used to compare the assembly process of a battery cell according to an embodiment of the present disclosure.

[0031] Figure 6 This is a schematic diagram illustrating a battery cell according to one embodiment of the present disclosure.

[0032] Explanation of reference numerals in the attached figures:

[0033] 110, 310: Main body of the casing; 110A: Opening.

[0034] 120, 320: Cover plate

[0035] 130: Electrode assembly

[0036] 111, 311: Protrusions

[0037] 121, 122, 321: Electrode terminals Detailed Implementation

[0038] The present disclosure will now be described in detail with reference to the accompanying drawings. However, these are merely examples, and the present disclosure is not limited to the specific embodiments described herein.

[0039] The specific terminology used in this specification is for illustrative purposes only and is not intended to limit the embodiments shown.

[0040] For example, expressions such as "same" and "identical" not only indicate a state of strict sameness, but also indicate a state of difference in tolerance or degree of achieving the same functionality.

[0041] For example, expressions such as "any direction", "along any direction", "parallel", "perpendicular", "centered", "concentric" or "coaxial" indicate relative or absolute arrangement. They not only indicate an arrangement that is strictly so, but also indicate a state of relative displacement with tolerances or to achieve the same degree of functionality at angles or distances.

[0042] To illustrate this disclosure, the following explanation is based on an orthogonal spatial coordinate system in which the X, Y, and Z axes are orthogonal to each other. Each axis (X-axis direction, Y-axis direction, Z-axis direction) represents the two directions on which each axis extends.

[0043] The X, Y, and Z directions described below are for illustrative purposes to provide a clearer understanding of this disclosure. Of course, each direction may be defined differently depending on the reference datum.

[0044] The use of terms such as "first," "second," and "third" before the components described below is solely to avoid confusion and is unrelated to the order, importance, or hierarchical relationship between the components. For example, it is also possible to implement an invention that includes only the second component without the first component.

[0045] The terminology used in this disclosure is for illustrative purposes only and is not intended to limit the scope of the claims. As used in the description of the embodiments and in the appended claims, the singular form includes the plural form unless the context clearly indicates otherwise.

[0046] Figure 1 This is a schematic perspective view of a battery casing according to one embodiment of the present disclosure. Figure 2 This is a schematic diagram showing a portion of a battery casing according to one embodiment of the present disclosure.

[0047] Reference Figure 1 and Figure 2 According to one embodiment of the present disclosure, a battery housing may include: a housing body 110 having an opening in which an electrode assembly is received; a cover plate 120 inserted into the opening; and a protrusion 111 into which the cover plate 120 is inserted, and the protrusion 111 protrudes outwardly than other areas of the housing body.

[0048] According to one embodiment of the present disclosure, a battery cell can be understood as housing an electrode assembly 130 within the battery casing. Figure 1 and Figure 2 The battery casing is shown in a prismatic shape, but is not limited to this; it can be cylindrical, prismatic, etc.

[0049] The following section will describe both the battery casing and the battery cell.

[0050] The battery cell may further include an electrolyte. The electrolyte may be a medium for transferring ions or current between the positive and negative electrodes of the electrode assembly 130.

[0051] In one embodiment, the battery cell 100 can be a secondary battery capable of multiple charging and discharging cycles. For example, the secondary battery can be one of the following: lithium cobalt battery, lithium high-nickel battery, lithium iron phosphate battery, lithium-ion battery, lithium polymer battery, lithium sulfur battery, nickel-metal hydride battery, nickel-cadmium battery, sodium battery, or all-solid-state battery, but is not limited to these, and can be modified into various types of secondary batteries.

[0052] The electrode assembly 130 may include electrodes and a diaphragm. In one embodiment, the electrode assembly 130 may include a first electrode and a second electrode, and a diaphragm may be disposed between the first electrode and the second electrode.

[0053] In one embodiment, the electrode assembly 130 may be plate-shaped, prismatic, or rolled.

[0054] In one embodiment, the battery housing may include electrode terminals 121, 122. In another embodiment, the electrode terminals 121, 122 may be formed on a cover plate 120.

[0055] The electrode terminals 121 and 122 are electrically connected to the electrode assembly 130, and the electrode terminals 121 and 122 can also be electrically connected to an external device. That is, current can flow to an external device through the electrode terminals 121 and 122.

[0056] The first electrode and the second electrode of the electrode assembly 130 may each include electrode leads 131 and 132, which may be electrically connected to electrode terminals 121 and 122.

[0057] According to one embodiment, the width W2 of the cover plate 120 may be greater than the width W1 of the opening 110A of the housing body 110. The width W2 of the cover plate 120 may be based on the outer side of the cover plate 120.

[0058] In one embodiment, the width W2 of the area in the cover plate 120 into the opening 110A of the housing body 110 can be greater than the width W1 of the opening 110A of the housing body 110. The width W1 of the opening 110A of the housing body 110 can be based on the inner side of the housing body 110, i.e., the inner sidewall.

[0059] In the opening 110A of the housing body 110, a protrusion 111 can be formed in the area where the cover plate 120 is inserted. This is because the width of the cover plate 120 is greater than the width of the opening of the housing body 110. As the cover plate 120 is inserted into the housing body 110, a region of the opening of the housing body can expand to the width of the cover plate 120. At this time, in the opening of the housing body 110, the width of the region of the opening where the cover plate is inserted can expand to the width of the cover plate, while the width of the region of the opening where the cover plate is not inserted may not expand.

[0060] In one embodiment, width refers to the size of the cover plate, and can refer to length, width, diameter, etc., depending on the shape of the cover plate. In one embodiment, when the cover plate is prismatic, width can represent the length or width of the cover plate. Additionally, when the cover plate is circular, width can represent the diameter.

[0061] In one embodiment, the width difference (W2-W1) between the cover plate 120 and the opening 110A of the housing body 110 can be 0.4 mm to 0.8 mm. Alternatively, the width difference (W2-W1) between the cover plate 120 and the opening 110A of the housing body can be 0.2 mm to 0.4 mm.

[0062] In one embodiment, the width W1 of the opening 110A of the housing body can be 28mm to 32mm, specifically, it can be 29mm to 31mm, 29.6mm to 30.4mm, or 29.8mm to 30.2mm.

[0063] In one embodiment, the width W2 of the cover plate 120 can be 28mm to 32mm, specifically, it can be 29mm to 31mm, 29.6mm to 30.4mm, or 29.8mm to 30.2mm.

[0064] In one embodiment, the width W1 of the opening 110A of the housing body can be 29.8 mm to 30.2 mm, and the width W2 of the cover plate 120 can be 30.2 mm to 30.6 mm.

[0065] In one embodiment, the protrusion 111 may protrude outward from the outer side of the housing body by the difference (W2-W1) between the width W2 of the cover plate and the width W1 of the opening.

[0066] Within the housing body, the space accommodating the electrode assembly can be defined as the inner side, and the opposite direction can be defined as the outer side. That is, the outer surface of the housing body can be understood as the outer side.

[0067] Reference Figure 2 Compared to other areas of the housing body 110, the portion into which the cover plate 120 is inserted can protrude a predetermined distance G further outward than other areas of the housing body 110 to form a protrusion 111.

[0068] In one embodiment, the thickness T1 of other areas of the housing body and the thickness T1 of the housing body at the protrusion 111 can be the same.

[0069] In one embodiment, a protrusion 111 may be formed in the length direction and / or width direction of the housing body.

[0070] In one embodiment, when the battery casing is prismatic, protrusions 111 can be formed on both sides of the opening 110A of the casing body 110 along the longitudinal direction (y-direction). A protrusion can be formed in a region of the opening of the casing body by inserting a cover plate longer than the opening of the casing body into the casing body.

[0071] In one embodiment, when the battery casing is prismatic, protrusions 111 can be formed on both sides of the opening 110A of the casing body 110 in the width direction (x direction). By inserting a cover plate whose width is longer than the width of the opening of the casing body into the casing body, a protrusion can be formed in a region of the opening of the casing body.

[0072] In one embodiment, when the battery casing is prismatic, a protrusion 111 can be formed simultaneously in both the length direction (y direction) and width direction (x direction) of the opening 110A of the casing body 110.

[0073] In one embodiment, the cover plate 120 may include an insertion area, the width of which is smaller than the width W1 of the opening 110A of the housing body.

[0074] The width W0 of the insertion area of ​​the cover plate 120 can be 25mm to 28mm.

[0075] Figure 3 and Figure 4 This diagram schematically illustrates the assembly process of a battery cell according to an embodiment of the present disclosure. The assembly process of a battery casing and a battery cell according to an embodiment of the present disclosure will be described below. This will provide a clearer understanding of the structure of the battery casing and battery cell according to an embodiment of the present disclosure.

[0076] In one embodiment, after the electrode assembly 130 is housed inside the housing body 110, the cover plate 120 can be inserted into the housing body 110. The electrode assembly 130 can be accommodated through the opening 110A of the housing body 110. The shape of the opening 110A is not particularly limited, as long as it is a shape that allows the electrode assembly 130 to pass through. The shape of the cover plate 120 can be a shape corresponding to the opening 110A.

[0077] According to one embodiment of this disclosure, the width W2 of the cover plate 120 may be greater than the width W1 of the opening 110A of the housing body 110.

[0078] The width W2 of the cover plate 120 can be based on the outer side of the cover plate 120. In the cover plate 120, the width of the area into which the opening 110A of the housing body 110 is inserted can be greater than the width W1 of the opening 110A of the housing body 110.

[0079] The width W1 of the opening 110A of the housing body 110 can be based on the inner side of the housing body 110, that is, the inner wall.

[0080] In one embodiment, the difference in width (W2-W1) between the cover plate 120 and the opening 110A of the housing body 110 can be 0.4 mm to 0.8 mm. Alternatively, the difference in width (W2-W1) between the cover plate 120 and the opening 110A of the housing body can be 0.2 mm to 0.4 mm.

[0081] In one embodiment, the width W1 of the opening 110A of the housing body can be 28mm to 32mm, specifically, it can be 29mm to 31mm, 29.6mm to 30.4mm, or 29.8mm to 30.2mm.

[0082] In one embodiment, the width W2 of the cover plate 120 can be 28mm to 32mm, specifically, it can be 29mm to 31mm, 29.6mm to 30.4mm, or 29.8mm to 30.2mm.

[0083] In one embodiment, the width W1 of the opening 110A of the housing body can be 29.8 mm to 30.2 mm, and the width W2 of the cover plate 120 can be 30.2 mm to 30.6 mm.

[0084] In one embodiment, the cover plate 120 may include an insertion area, the width W0 of which is smaller than the width W1 of the opening 110A of the housing body.

[0085] The width W0 of the insertion area of ​​the cover plate 120 can be 25mm to 28mm.

[0086] According to one embodiment, the cover plate 120 can be inserted into the housing body 110 by pressing.

[0087] In this disclosure, the pressing method can refer to a method of inserting an object by applying physical force to a portion of the insertion space smaller than the object being inserted. That is, in this disclosure, it can refer to a method of inserting a cover plate 120 having a width greater than the width of the opening 110A into the opening 110A.

[0088] As described above, since the width W2 of the cover plate is larger than the width W1 of the opening 110A of the housing body, the cover plate 120 may not be able to be directly inserted into the housing body 110.

[0089] Therefore, the cover plate 120 can be inserted into the opening 110A of the housing body by pressing. That is, the cover plate 120 can be placed on the opening 110A and a predetermined pressure can be applied to the cover plate 120. In this way, the opening 110A of the housing body 110 will be slightly enlarged, so that the cover plate 120 can be inserted. Therefore, there can be no gap between the housing body 110 and the cover plate 120, and they can fit completely tightly.

[0090] In one embodiment, the housing body 110 may comprise various metals such as iron and aluminum, as well as alloys of these metals, plastics, ceramics, or carbon materials.

[0091] In one embodiment, the housing body 110 may be carbon steel with a nickel (Ni) or tin (Sn) plating formed on its surface. Alternatively, in another embodiment, the housing body 110 may be hypoeutectoid steel with a carbon content of 0.8% wt or less. Or, it may be stainless steel containing chromium (Cr) or the like.

[0092] In one embodiment, the portion of the cover plate 120 inserted into the housing body 110 may protrude outward from the housing body 110.

[0093] In one embodiment, the cover plate 120 may include an insertion region, the width W0 of which is smaller than the width W1 of the opening 110A of the housing body. By first inserting the insertion region into the opening 110A and then applying pressure, a larger portion of the width W1 of the cover plate 120 can be easily pressed into the opening 110A.

[0094] In this disclosure, the space accommodating the electrode assembly can be defined as the inner side, and the opposite direction can be defined as the outer side. That is, the outer surface of the battery casing can be understood as the outer side.

[0095] Reference Figure 4 Compared to other areas of the housing body 110, the portion into which the cover plate 120 is inserted can protrude a predetermined distance G further outward than other areas of the housing body 110 to form a protrusion 111.

[0096] In one embodiment, with the outer surface of the battery casing as a reference, the protrusion can exceed the width difference (W2-W1) between the cover plate 120 and the opening 110A of the casing body 110.

[0097] In one embodiment, the thickness T1 of the housing body can remain constant during the cover plate 120 insertion process. When the cover plate 120 is inserted, the thickness T1 of the housing body remains constant, and the housing body 110 can expand outward.

[0098] That is, the thickness T1 of other areas of the shell body and the thickness T1 of the shell body at the protrusion 111 can be the same.

[0099] In one embodiment, when the battery casing is prismatic, protrusions 111 can be formed on both sides of the opening 110A of the casing body 110 in the longitudinal direction (y direction).

[0100] In one embodiment, when the battery casing is prismatic, protrusions 111 can be formed on both sides of the opening 110A of the casing body 110 in the width direction (x direction).

[0101] In one embodiment, when the battery casing is prismatic, a protrusion 111 can be formed simultaneously in both the length direction (y direction) and width direction (x direction) of the opening 110A of the casing body 110.

[0102] When the cover plate 120 is inserted into the housing body 110, it can seal the housing body 110 and the cover plate 120, thereby closing the housing body 110.

[0103] The method of sealing the housing body 110 and the cover plate 120 is not particularly limited; for example, it can be performed by welding. The welding method can be ultrasonic welding or laser welding.

[0104] In one embodiment, the weldability may be excellent because the housing body 110 and the cover plate 120 are completely fitted together without any gap. Since the cover plate 120, which is larger than the opening of the housing body 110, is inserted in a press-fit manner, the housing body 110 and the cover plate 120 are in a tight fit, thereby reducing the defect rate during laser welding.

[0105] Figure 5 This is a diagram used to compare the assembly process of a battery cell according to an embodiment of the present disclosure.

[0106] like Figure 5 As shown, a cover plate 12 can be inserted into the housing body 11. A step is formed on the inner wall of the housing body 11 to accommodate the cover plate 12. Because the housing body and the cover plate contact each other via the step, the adhesion between the housing body 11 and the cover plate 12 is not high. Tolerances may occur during the production of the housing body 11 and the cover plate 12, and gaps may still exist between them. Furthermore, the area of ​​the cover plate 120 that engages with the step portion of the housing body 11 may not be weldable, potentially reducing the sealing performance of the housing body.

[0107] In contrast, in one embodiment of this disclosure, since the housing body 110 and the cover plate can fit together completely without gap, the sealing achieved by welding may be excellent.

[0108] Figure 6 This is a schematic diagram illustrating a battery cell according to one embodiment of the present disclosure.

[0109] Reference Figure 6 According to one embodiment, the battery cell can be cylindrical.

[0110] However, this is just an example; battery cells can be deformed into various shapes such as prisms and hexahedrons.

[0111] The battery cell may include: a housing body 310 having an opening in which an electrode assembly is housed; an electrode assembly housed in the housing body 310; a cover plate 320 inserted into the opening; and a protrusion 311 for inserting the cover plate, protruding outwards from other areas of the housing body.

[0112] According to one embodiment of this disclosure, a battery cell can be understood as housing an electrode assembly within the battery casing. The electrode assembly may be in a rolled form.

[0113] and Figure 1 and Figure 2 compared to, Figure 1 and Figure 2 The image shows a prismatic battery cell. Figure 6 The image shows a cylindrical battery cell.

[0114] In one embodiment, the battery cell may include electrode terminals 321. In one embodiment, the electrode terminals 321 may be formed on a cover plate 320. Alternatively, the electrode terminals 321 may be formed on a surface opposite to the cover plate.

[0115] The electrode assembly may include a first electrode and a second electrode, and a diaphragm may be disposed between the first electrode and the second electrode. The first electrode and the second electrode of the electrode assembly may each include electrode leads, which may be electrically connected to electrode terminals 321.

[0116] According to one embodiment, the width W2 of the cover plate 320 may be greater than the width W1 of the opening of the housing body 310.

[0117] As described above, the width refers to the size of the cover plate, and can refer to the length, width, diameter, etc., depending on the shape of the cover plate. In one embodiment, when the cover plate is prismatic, the width can represent the length or width of the cover plate. Additionally, when the cover plate is circular, the width can represent the diameter.

[0118] The width W2 of the cover plate 320 can be based on the outer diameter of the cover plate 320.

[0119] In one embodiment, the width of the area in the cover plate 320 that is inserted into the opening of the housing body 310 may be greater than the width of the opening of the housing body 310. The width of the opening of the housing body 310 may be based on the inner diameter of the housing body 310.

[0120] When the battery cell is cylindrical, the cover plate 320 and the housing body can be circular, and the width can represent the diameter. In one embodiment, the outer diameter of the cover plate 320 can be larger than the inner diameter of the opening.

[0121] In one embodiment, the width difference (W2-W1) between the cover plate 320 and the opening of the housing body 310 can be 0.4 mm to 0.8 mm. Alternatively, the width difference (W2-W1) between the cover plate 320 and the opening of the housing body can be 0.2 mm to 0.4 mm.

[0122] In one embodiment, the protrusion 311 may protrude outward from the housing body 310 by the difference (W2-W1) between the width W2 of the cover plate and the width W1 of the opening. A protrusion can be formed in a region of the opening of the housing body by inserting a cover plate having an outer diameter larger than the inner diameter of the opening of the housing body 310 into the housing body.

[0123] In one embodiment, the thickness T1 of other areas of the housing body and the thickness T1 of the housing body at the protrusion 311 can be the same.

[0124] In one embodiment, the cover plate 320 may include an insertion area, the width of which is smaller than the width of the opening in the housing body.

[0125] According to one embodiment of the battery casing and cell of this disclosure, the excellent adhesion between the casing body and the cover plate results in excellent welding performance. Therefore, the battery casing exhibits excellent sealing, thereby preventing electrolyte leakage and improving stability.

[0126] This disclosure can be implemented in various forms, and its scope of rights is not limited to the embodiments described above. Therefore, if a modified embodiment includes components within the scope of the claims of this disclosure, it should be considered to fall within the scope of this disclosure.

Claims

1. A battery casing, comprising: The housing body has an opening in which the electrode assembly is housed; Cover plate, inserted into the opening; as well as A protrusion, into which the cover plate is inserted, and the protrusion protrudes further outward than other areas of the housing body.

2. The battery casing according to claim 1, wherein, The width (W2) of the cover plate is greater than the width (W1) of the opening.

3. The battery casing according to claim 1, wherein, The difference between the width (W2) of the protrusion of the cover plate and the width (W1) of the opening (W2-W1).

4. The battery casing according to claim 1, wherein, The thickness of the other areas of the housing body is the same as the thickness of the housing body at the protrusion.

5. The battery casing according to claim 1, wherein, The cover plate includes an insertion area, the width of which is smaller than the width of the opening.

6. The battery casing according to claim 1, wherein, The protrusion is formed in the length direction and / or width direction of the housing body.

7. The battery casing according to claim 1, wherein, The main body of the shell is prismatic or cylindrical.

8. The battery casing according to claim 1, wherein, The main body of the housing is cylindrical, and the outer diameter of the cover plate is larger than the inner diameter of the opening.

9. A battery cell, comprising: The housing body has an opening in which the electrode assembly is housed; The electrode assembly is housed in the housing body; Cover plate, inserted into the opening; as well as A protrusion, into which the cover plate is inserted, and the protrusion protrudes further outward than other areas of the housing body.

10. The battery cell according to claim 9, wherein, The width (W2) of the cover plate is greater than the width (W1) of the opening.

11. The battery cell according to claim 9, wherein, The thickness of the other areas of the housing body is the same as the thickness of the housing body at the protrusion.

12. The battery cell according to claim 9, wherein, The housing body and the cover plate are sealed by welding.

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