Electrode laminate and battery system comprising electrode laminate

Abstract

An electrode laminate according to an embodiment of the present invention comprises: a first electrode laminate; and a second electrode laminate disposed on the first electrode laminate and formed in a shape different from that of the first electrode laminate when viewed from the top, wherein the first electrode laminate and the second electrode laminate may be bendable in a stacking direction.

Description

Electrode laminate and battery system including electrode laminate

[0001] Cross-citation with related applications

[0002] This application claims the benefit of priority from Korean Patent Application No. 10-2023-0083720, filed June 28, 2023, the entire contents of which are incorporated herein by reference.

[0003] Technology field

[0004] The present invention relates to an electrode laminate and a battery system including the electrode laminate.

[0005] To address the growing demand for new energy sources due to the depletion of petroleum resources and to address the worsening environmental pollution problem, research and development are underway on power generation based on eco-friendly energy sources. In particular, active research is being conducted on secondary batteries capable of repeated charging and discharging, exploring various aspects of secondary batteries, including their materials, structure, processes, and stability.

[0006] Secondary batteries may include electrode stacks. In particular, energy efficiency can be improved and space efficiency can be maximized when the electrode stack itself has a high density or is mounted at a high density. The secondary battery may have an external shape that corresponds to the shape of the electrode stack.

[0007] According to conventional technology, simply mounting a secondary battery within a battery system (e.g., an electronic device) may result in reduced space efficiency and insufficient battery capacity.

[0008] The problem to be solved by the present invention is to provide an electrode laminate and a battery system including the electrode laminate that can maximize space efficiency and battery capacity.

[0009] An electrode laminate according to one embodiment of the present invention includes a first electrode laminate and a second electrode laminate disposed on the first electrode laminate and formed in a different shape from the first electrode laminate when viewed from above, and the first electrode laminate and the second electrode laminate can be bent along a lamination direction.

[0010] A battery system according to one embodiment of the present invention includes a battery unit having a bent portion formed in a bent shape defining a receiving space for receiving an electrode laminate therein, and an electrode laminate arranged in the receiving space, wherein the electrode laminate includes a first electrode laminate and a second electrode laminate arranged on the first electrode laminate and formed in a different shape from the first electrode laminate when viewed from above, and the first electrode laminate and the second electrode laminate can be bent along a lamination direction.

[0011] According to a preferred embodiment of the present invention, space efficiency within a battery system can be maximized.

[0012] According to a preferred embodiment of the present invention, the available battery capacity can be maximized.

[0013] Figure 1 is a plan view of an electrode laminate according to a first embodiment of the present invention.

[0014] Figure 2 is a side view of an electrode laminate according to a first embodiment of the present invention.

[0015] Figure 3 is a perspective view of an electrode laminate according to a first embodiment of the present invention.

[0016] Figure 4 is a plan view of an electrode laminate according to a second embodiment of the present invention.

[0017] Figure 5 is a side view of an electrode laminate according to a second embodiment of the present invention.

[0018] Figure 6 is a perspective view of an electrode laminate according to a second embodiment of the present invention.

[0019] Figure 7 is a plan view of an electrode laminate according to a third embodiment of the present invention.

[0020] Figure 8 is a side view of an electrode laminate according to a third embodiment of the present invention.

[0021] Figure 9 is a perspective view of an electrode laminate according to a third embodiment of the present invention.

[0022] Figure 10 is a plan view of an electrode laminate according to a fourth embodiment of the present invention.

[0023] Fig. 11 is a side view of an electrode laminate according to a fourth embodiment of the present invention.

[0024] Fig. 12 is a perspective view of an electrode laminate according to a fourth embodiment of the present invention.

[0025] Fig. 13 is a plan view of an electrode laminate according to a fifth embodiment of the present invention.

[0026] Fig. 14 is a side view of an electrode laminate according to a fifth embodiment of the present invention.

[0027] Fig. 15 is a perspective view of an electrode laminate according to a fifth embodiment of the present invention.

[0028] Fig. 16 is a plan view of an electrode laminate according to a sixth embodiment of the present invention.

[0029] Fig. 17 is a side view of an electrode laminate according to a sixth embodiment of the present invention.

[0030] Fig. 18 is a perspective view of an electrode laminate according to a sixth embodiment of the present invention.

[0031] Figure 19 is a conceptual diagram showing a battery system according to one embodiment of the present invention.

[0032] Hereinafter, with reference to the attached drawings, preferred embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the invention. However, the present invention may be implemented in various different forms and is not limited or restricted by the following examples.

[0033] In order to clearly explain the present invention, a detailed description of a part that is irrelevant to the description or a related known technology that may unnecessarily obscure the gist of the present invention has been omitted, and when adding reference signs to components of each drawing in this specification, the same or similar reference signs are attached to the same or similar components throughout the specification.

[0034] In addition, terms and words used in this specification and claims should not be interpreted as limited to their usual or dictionary meanings, but should be interpreted as meanings and concepts that conform to the technical idea of ​​the present invention based on the principle that the inventor can appropriately define the concept of the term to explain his or her own invention in the best way.

[0035] FIG. 1 is a plan view of an electrode laminate according to a first embodiment of the present invention, FIG. 2 is a side view of an electrode laminate according to a first embodiment of the present invention in the X direction, and FIG. 3 is a perspective view of an electrode laminate according to a first embodiment of the present invention.

[0036] The electrode stack (10) may include a first electrode stack (100) and a second electrode stack (200).

[0037] The first electrode laminate (100) can be formed by laminating electrodes (100-1), and the second electrode laminate (200) can be formed by laminating electrodes (200-1).

[0038] The first electrode laminate (100) and the second electrode laminate (200) may be in a laminated form.

[0039] The second electrode stack (200) can be placed on the first electrode stack (100).

[0040] The second electrode laminate (200) may be formed in a different shape from the first electrode laminate (100) when viewed from above.

[0041] The second electrode stack (200) may be smaller in size than the first electrode stack (100). For example, the second electrode stack (200) may have a smaller area than the first electrode stack (100) when viewed from above.

[0042] The second electrode stack (200) may include an edge that overlaps with an edge of the first electrode stack (100). For example, the second electrode stack (200) may have a smaller area than the first electrode stack (100), but may have an edge that overlaps with some of the edges of the first electrode stack (100).

[0043] The second electrode stack (200) may have a smaller area and a different shape from the first electrode stack (100) when viewed from above.

[0044] At least one of the first electrode laminate (100) and the second electrode laminate (200) may have corners formed in different shapes when viewed from above.

[0045] The first electrode laminate (100) may include corner parts (111, 112, 113, 114, 115).

[0046] The corner sections (111, 112, 113, 114, 115) may include intersecting corner sections. For example, the intersecting corner section may be a corner section formed in a form in which straight lines intersect at a predetermined angle when viewed from above.

[0047] The corner parts (111, 112, 113, 114, 115) may include a plurality of obtuse intersection corner parts. Specifically, for example, some of the corner parts (113, 114) among the corner parts (111, 112, 113, 114, 115) may be obtuse intersection corner parts formed by straight lines forming obtuse angles when viewed from above. In addition, some of the other corner parts (111, 112, 113, 114, 115) among the corner parts (111, 112, 115) may be intersection corner parts formed by straight lines intersecting each other when viewed from above.

[0048] The description of the corner parts (111, 112, 113, 114, 115) of the first electrode laminate (100) described above can also be applied to the corner parts (211, 212, 213, 214, 215) of the second electrode laminate (200) described later.

[0049] The first electrode stack (100) may include side surfaces (101, 102, 103, 104, 105). The side surfaces (101, 102, 103, 104, 105) may form the lateral outer surfaces of the electrodes (100-1). In addition, the side surfaces (101, 102, 103, 104, 105) may connect the upper surface and the lower surface of the first electrode stack (100) along the stacking direction (Z-Z').

[0050] The side surfaces (101, 102, 103, 104, 105) can be divided by corner portions (111, 112, 113, 114, 115).

[0051] The side surfaces (101, 102, 103, 104, 105) may include multiple planes. For example, the side surfaces (101, 102, 103, 104, 105) may include multiple planes separated by corner portions (111, 112, 113, 114, 115).

[0052] The second electrode laminate (200) may include side surfaces (201, 202, 203, 204, 205). The side surfaces (201, 202, 203, 204, 205) may form the lateral outer edges of the electrodes (200-1). In addition, the side surfaces (201, 202, 203, 204, 205) may connect the upper surface and the lower surface of the second electrode laminate (200) along the lamination direction (Z-Z').

[0053] The side surfaces (201, 202, 203, 204, 205) can be divided by corner portions (211, 212, 213, 214, 215).

[0054] The side surfaces (201, 202, 203, 204, 205) may include multiple planes. For example, the side surfaces (201, 202, 203, 204, 205) may include multiple planes separated by corner portions (211, 212, 213, 214, 215).

[0055] The first electrode stack (100) and the second electrode stack (200) can be bent along the stacking direction (Z-Z'). For example, the first electrode stack (100) and the second electrode stack (200) can be bent in one direction along the stacking direction at a predetermined curvature. The first electrode stack (100) and the second electrode stack (200) can be bent in one direction (e.g., upward) along the stacking direction (Z-Z') as the electrodes (100-1) and the electrodes (200-1) are bent.

[0056] Fig. 4 is a plan view of an electrode laminate according to a second embodiment of the present invention, Fig. 5 is a side view of an electrode laminate according to a second embodiment of the present invention in the X direction, and Fig. 6 is a perspective view of an electrode laminate according to a second embodiment of the present invention. The description of the above-described embodiment can be applied to the present embodiment in the same or similar manner.

[0057] At least one of the first electrode stack (100a) and the second electrode stack (200a) may have corner portions formed in different shapes when viewed from above. For example, the first electrode stack (100a) may include corner portions (111a, 112a, 113a, 114a).

[0058] The corner portions (111a, 112a, 113a, 114a) may include a curved corner portion (112a). The curved corner portion (112a) may be a corner portion formed in a curved shape when viewed from above.

[0059] The side surfaces (101a, 102a, 103a) may include flat surfaces and curved surfaces. For example, the first electrode stack (100a) may include flat side surfaces (101a, 103a) and curved side surfaces (102a).

[0060] The corner portions (111a, 112a, 113a, 114a) may include cross corner portions (111a, 113a, 114a) and curved corner portions (112a).

[0061] When viewed from above, the intersection corner portions (111a, 113a, 114a) may be formed by straight lines intersecting at a predetermined angle, and the curved corner portion (112a) may be formed in a curved shape. Specifically, when viewed from above, a curved corner portion (112a) having a curved shape may be formed between the intersection corner portions (111a) and the intersection corner portions (113a). In other words, when the first electrode stack (100a) is viewed from above, only the portion corresponding to the curved corner portion (112a) on the upper surface of the rectangular shape may be formed in a curved shape.

[0062] As described above, the first electrode stack (100a) has been described as having one curved corner portion (112a), but this may not be limited thereto. For example, the first electrode stack (100a) may have multiple curved corner portions.

[0063] The second electrode laminate (200a) may include corner parts (211a, 212a, 213a, 214a, 215a).

[0064] The corner pieces (211a, 212a, 213a, 214a, 215a) can be formed in different shapes when viewed from above.

[0065] The corner portions (211a, 212a, 213a, 214a, 215a) may include an intersecting corner portion. For example, the intersecting corner portion may be a corner portion formed in a form in which straight lines intersect at a predetermined angle when viewed from above.

[0066] Some of the corner parts (211a, 212a, 213a, 214a, 215a) may be formed in a shape in which straight lines are perpendicular to each other. Other corner parts (213a, 214a) among the corner parts (211a, 212a, 213a, 214a, 215a) may be formed in a shape in which straight lines form a predetermined angle other than a right angle.

[0067] Specifically, the intersection corner portion may include an obtuse intersection corner portion (213a, 214a). For example, the obtuse intersection corner portion (213a, 214a) may be a corner portion formed in a form in which straight lines intersect to form an obtuse angle. The intersection corner portion may include a plurality of obtuse intersection corner portions (213a, 214a).

[0068] Fig. 7 is a plan view of an electrode laminate according to a third embodiment of the present invention, Fig. 8 is a side view of an electrode laminate according to a third embodiment of the present invention in the X direction, and Fig. 9 is a perspective view of an electrode laminate according to a third embodiment of the present invention. The description of the above-described embodiment can be applied to the present embodiment in the same or similar manner.

[0069] In terms of the shape of the second electrode stack (200b), the description of the second electrode stack (200a) described with reference to FIGS. 4 to 6 may be applied. However, the second electrode stack (200b) may have a shorter edge length that overlaps the first electrode stack (100b) compared to the second electrode stack (200a). For example, the edge portion where the second electrode stack (200b) and the first electrode stack (100b) overlap may be an edge connecting the corner portion (211b) and the corner portion (215b) among the edges of the second electrode stack (200b). The edge connecting the corner portion (211b) and the corner portion (215b) may partially overlap with the edge connecting the corner portion (111b) and the corner portion (114b).

[0070] The first electrode laminate (100b) may include corner parts (111b, 112b, 113b, 114b).

[0071] The corners (111b, 112b, 113b, 114b) of the first electrode laminate (100b) may be cross corners.

[0072] The corner portions (111b, 112b, 113b, 114b) of the first electrode laminate (100b) may include acute angle intersection corner portions and obtuse angle intersection corner portions.

[0073] The acute intersection corner portion (112b) may be a corner portion in which straight lines intersect at an acute angle when viewed from above. The obtuse intersection corner portion (113b) may be a corner portion in which straight lines intersect at an obtuse angle when viewed from above. The above-described acute angle and obtuse angle may be based on the internal angle of the first electrode stack (100b) when viewed from above. In other words, when viewed from above, the first electrode stack (100b) may have a trapezoidal shape.

[0074] The description of the electrode laminates (10, 10a, 10b) described with reference to FIGS. 1 to 9 is an example and is not limited thereto. Specifically, the corners of the electrode laminates can be designed in various ways by combining cross corners and / or curved corners.

[0075] FIG. 10 is a plan view of an electrode laminate according to a fourth embodiment of the present invention, FIG. 11 is a side view of an electrode laminate according to a fourth embodiment of the present invention, and FIG. 12 is a perspective view of an electrode laminate according to a fourth embodiment of the present invention.

[0076] The electrode stack (10c) may include a first electrode stack (100c) and a second electrode stack (200c).

[0077] The second electrode stack (200c) can be placed on the first electrode stack (100c).

[0078] The first electrode stack (100c) and the second electrode stack (200c) may have a rectangular shape. For example, the first electrode stack (100c) and the second electrode stack (200c) may be formed in a rectangular shape, and when viewed from above, three edges may overlap. In other words, the first electrode stack (100c) and the second electrode stack (200c) may be formed to have the same width but different heights when viewed from above.

[0079] FIG. 13 is a plan view of an electrode laminate according to a fifth embodiment of the present invention, FIG. 14 is a side view of an electrode laminate according to a fifth embodiment of the present invention, and FIG. 15 is a perspective view of an electrode laminate according to a fifth embodiment of the present invention.

[0080] The electrode stack (10d) may include a first electrode stack (100d) and a second electrode stack (200d).

[0081] The second electrode stack (200d) can be placed on the first electrode stack (100d).

[0082] The first electrode stack (100d) and the second electrode stack (200d) may have a rectangular shape. Specifically, the first electrode stack (100d) and the second electrode stack (200d) are formed in a rectangular shape, and when viewed from above, two edges may overlap. In other words, the first electrode stack (100d) and the second electrode stack (200d) may be formed to have different widths and heights when viewed from above.

[0083] FIG. 16 is a plan view of an electrode laminate according to a sixth embodiment of the present invention, FIG. 17 is a side view of an electrode laminate according to a sixth embodiment of the present invention, and FIG. 18 is a perspective view of an electrode laminate according to a sixth embodiment of the present invention.

[0084] The electrode stack (10e) may include a first electrode stack (100e) and a second electrode stack (200e).

[0085] The second electrode stack (200e) can be placed on the first electrode stack (100e).

[0086] The first electrode stack (100e) and the second electrode stack (200e) may have a rectangular shape. Specifically, the first electrode stack (100e) and the second electrode stack (200e) are formed in a rectangular shape, and when viewed from above, one edge may overlap.

[0087] The description of the electrode stacks (10c, 10d, 10e) described with reference to FIGS. 10 to 18 is an example and is not limited thereto. For example, the first electrode stack and the second electrode stack may be formed in a rectangular shape, but when viewed from above, the edges may not overlap.

[0088] Figure 19 is a conceptual diagram illustrating a battery system according to an embodiment of the present invention. The description of the aforementioned embodiment may be applied identically or similarly to the present embodiment.

[0089] The battery system (1) may include a battery unit (2).

[0090] The battery unit (2) can perform the function of supplying power to the battery system (1). The battery unit (2) can accommodate an electrode laminate (10, 10a, 10b, 10c, 10d, 10e) therein.

[0091] The battery portion (2) may include a bending portion (3). For example, the bending portion (3) may have a bent shape defining a receiving space for receiving the electrode laminate (10, 10a, 10b, 10c, 10d, 10e) therein.

[0092] The battery unit (2) may include electrode stacks (10, 10a, 10b, 10c, 10d, 10e). The electrode stacks (10, 10a, 10b, 10c, 10d, 10e) may be arranged in the receiving space of the bending portion (3). However, the electrode stacks (10, 10a, 10b, 10c, 10d, 10e) may also be arranged at a location other than the bending portion (3).

[0093] One outer surface of the electrode stack (10, 10a, 10b, 10c, 10d, 10e) may be arranged to face the inner surface of the bending portion (3). For example, the upper surface of the electrode stack (10, 10a, 10b, 10c, 10d, 10e) may be arranged to face the inner surface of the bending portion (3). In addition, the lower surface of the electrode stack (10, 10a, 10b, 10c, 10d, 10e) may be arranged to face the inner surface of the bending portion (3).

[0094] The bent inner surface of the bending portion (3) may include a portion bent at a predetermined curvature.

[0095] In the above description, it is described that the electrode stack is arranged, but the same can be applied to a case where the electrode stack is arranged by being built into a case.

[0096] The method of arranging electrode laminates (10, 10a, 10b, 10c, 10d, 10e) in the battery system (1) may include the steps described below.

[0097] A method for arranging electrode stacks (10, 10a, 10b, 10c, 10d, 10e) in a battery system (1) may include a type determination step. The type determination step may be a step of determining the types of electrode stacks (10, 10a, 10b, 10c, 10d, 10e) that can be arranged based on the size of a battery section (2) in which the electrode stacks (10, 10a, 10b, 10c, 10d, 10e) can be accommodated inside the battery system (1).

[0098] A method for arranging electrode stacks (10, 10a, 10b, 10c, 10d, 10e) in a battery system (1) may include a number determination step. The number determination step may be a step for determining the required number of electrode stacks (10, 10a, 10b, 10c, 10d, 10e) for each type.

[0099] A method for arranging electrode laminates (10, 10a, 10b, 10c, 10d, 10e) in a battery system (1) may include a arranging step. The arranging step may be a step of arranging electrode laminates (10, 10a, 10b, 10c, 10d, 10e) based on determination of type and number.

[0100] By arranging bent electrode laminates (10, 10a, 10b, 10c, 10d, 10e) in a curved portion, such as a bending portion (3) within a battery system (1), space efficiency can be maximized compared to simply stacking unbent electrode laminates.

[0101] The above-described bent electrode laminates (10, 10a, 10b, 10c, 10d, 10e) and non-bent electrode laminates can be mixed and arranged to fit the accommodation space within the battery system (1) to maximize space efficiency.

[0102] By maximizing the space efficiency within the battery system (1) through the arrangement of the electrode stacks (10, 10a, 10b, 10c, 10d, 10e), the battery capacity can also be maximized.

[0103] Although the present invention has been described above with reference to limited embodiments and drawings, the present invention is not limited thereto, and various embodiments are possible within the scope equivalent to the technical idea of ​​the present invention and the patent claims to be described below by a person having ordinary skill in the art to which the present invention pertains.

[0104] [Explanation of symbols]

[0105] 1: Battery system

[0106] 2: All departments

[0107] 3: Bending section

[0108] 10, 10a, 10b, 10c, 10d, 10e: Electrode laminates

[0109] 100, 100a, 100b, 100c, 100d, 100e: first electrode laminate

[0110] 100-1, 100-1a, 100-1b: Electrodes

[0111] 101, 101a: Side view

[0112] 102, 102a: Side view

[0113] 103, 103a: Side view

[0114] 104: Side view

[0115] 105: Side view

[0116] 111, 111a, 111b: Corner

[0117] 112, 112a, 112b: Corner

[0118] 113, 113a, 113b: Corner

[0119] 114, 114a, 114b: Corner

[0120] 115, 115a: Corner

[0121] 200, 200a, 200b, 200c, 200d, 200e: Second electrode laminate

[0122] 200-1, 200-1a, 200-1b: Electrodes

[0123] 201, 201a: Side view

[0124] 202, 202a: Side view

[0125] 203, 203a: Side view

[0126] 204, 204a: Side view

[0127] 205, 205a: Side view

[0128] 211, 211a, 211b: Corner

[0129] 212, 212a. 212b: Corner

[0130] 213, 213a. 213b: Corner

[0131] 214, 214a, 214b: Corner

[0132] 215, 215a, 215b: Corner

Claims

1. First electrode laminate; and A second electrode laminate is disposed on the first electrode laminate and formed in a different shape from the first electrode laminate when viewed from above, An electrode laminate in which the first electrode laminate and the second electrode laminate are bent along the lamination direction.

2. In claim 1, The above second electrode laminate is, An electrode laminate having a smaller size than the first electrode laminate.

3. In claim 1, The first electrode laminate and the second electrode laminate are, An electrode laminate bent at a predetermined curvature.

4. In claim 1, The first electrode laminate and the second electrode laminate are, An electrode laminate bent in one direction along the lamination direction.

5. In claim 1, The above second electrode laminate is, An electrode laminate comprising an edge overlapping with an edge of the first electrode laminate.

6. In claim 1, The above second electrode laminate is, An electrode laminate having a smaller area than the first electrode laminate when viewed from above.

7. In claim 1, The above first electrode laminate is, An electrode laminate with a curved surface formed on the side.

8. In claim 7, At least one of the first electrode laminate and the second electrode laminate, An electrode laminate having corners formed in different shapes when viewed from above.

9. In claim 8, The above corners are, An electrode laminate comprising a plurality of obtuse intersection corners.

10. In claim 8, The above corners are, A curved corner portion formed on the first electrode laminate; and An electrode laminate comprising a plurality of obtuse cross corner portions formed on the second electrode laminate.

11. In claim 8, The above corners are, An acute angle cross corner portion and an obtuse angle cross corner portion formed on the first electrode laminate; and An electrode laminate comprising a plurality of obtuse corner portions formed on the second electrode laminate.

12. In claim 1, The first electrode laminate and the second electrode laminate are, Bending in one direction along the stacking direction at a predetermined curvature, The above second electrode laminate is, An electrode laminate having a small area and a different shape from the first electrode laminate when viewed from above.

13. A battery section having a bent portion formed in a bent shape defining a receiving space for receiving an electrode laminate therein; and Including an electrode laminate arranged in the above-mentioned receiving space, The above electrode laminate is, First electrode laminate; and A second electrode laminate is disposed on the first electrode laminate and formed in a different shape from the first electrode laminate when viewed from above, A battery system in which the first electrode laminate and the second electrode laminate are bent along the lamination direction.

14. In claim 13, The above electrode laminate is, A battery system that bends at a predetermined curvature along the stacking direction of electrodes.

15. In claim 13, One outer surface of the above electrode laminate is, A battery system facing the inner surface of the above bending portion.

16. In claim 13, The above second electrode laminate is, A battery system having a smaller area than the first electrode laminate when viewed from above.

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