Shell structure and battery

Abstract

The utility model belongs to the field of batteries, and particularly relates to a base material, a battery shell and a battery, the base material is sheet-shaped, the outer edge of the base material is provided with a first edge, a second edge, a third edge and a fourth edge which are sequentially connected, and the inner side of the outer edge of the base material is provided with a first accommodating groove, a second accommodating groove, a first stamping pit and a second stamping pit which are not communicated with one another; the first straight line extends in the first direction, the first containing groove and the second containing groove are formed in the two sides of the first straight line, and the first containing groove and the second containing groove are spaced in the second direction to form a connecting strip; the first stamping pit and the second stamping pit are located on the two sides of the connecting strip in the first direction, and the first straight line penetrates through the middle of the first stamping pit and the middle of the second stamping pit. The first containing groove and the second containing groove are the same in concave direction, the first stamping pit and the second stamping pit are the same in concave direction, and the first containing groove and the first stamping pit are opposite in concave direction. The embodiment can avoid the formation of the convex part as much as possible and improve the energy density of the battery.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology, and in particular relates to a casing structure and a battery. Background Technology

[0002] Reference Figure 5-8 Common soft-pack lithium-ion batteries are formed by bending an aluminum-plastic film. Two receiving grooves 400 are punched out of the aluminum-plastic film, symmetrical about a first straight line 100. Each receiving groove 400 is spaced apart from the first straight line 100. The straight line on the side of one receiving groove 400 closest to the first straight line 100 is the second straight line 200. The aluminum-plastic film is then folded along the first straight line 100 and sealed to form a shell. The two receiving grooves 400 of the sealed aluminum-plastic film form a receiving cavity for placing the electrode core. The middle part of the bottom of the shell forms the bottom wall of the receiving cavity, which is located on the second straight line 200. Protrusions 300 appear on the left and right sides of the bottom of the shell at the sealing location. The protrusions 300 protrude from the bottom wall of the receiving cavity along the top-bottom direction of the shell, so that the bottom of the protrusions 300 is located on the first straight line 100. Furthermore, the protrusions 300 are non-active material filling areas and do not contribute to the energy density.

[0003] The presence of the protrusion increases the overall size of the existing battery, affecting the energy density per unit space. Summary of the Invention

[0004] The technical problem to be solved by this utility model is: to address the issue that the presence of the protruding part increases the overall size of the existing battery and affects the energy density per unit space of the battery, and to provide a casing structure and battery.

[0005] To solve the above-mentioned technical problems, on the one hand, this utility model provides a substrate for a battery casing. The substrate is sheet-shaped, and its outer edge has a first edge, a second edge, a third edge, and a fourth edge that are connected in sequence. The inner side of the outer edge of the substrate is provided with a first receiving groove, a second receiving groove, a first stamping pit, and a second stamping pit that are not interconnected. The substrate can be folded along a first straight line. The first straight line extends along a first direction and connects the first edge and the third edge. The first receiving groove and the second receiving groove are disposed on both sides of the first straight line. The first receiving groove and the second receiving groove are spaced apart from each other in a second direction to form a connecting strip extending along the first direction between them.

[0006] The first stamping dent and the second stamping dent are located on both sides of the connecting strip in the first direction, and the first straight line passes through the middle of the first stamping dent and the middle of the second stamping dent; the first receiving groove and the second receiving groove have the same concave direction, the first stamping dent and the second stamping dent have the same concave direction, and the first receiving groove and the first stamping dent have opposite concave directions.

[0007] Optionally, the first receiving groove and the second receiving groove are arranged symmetrically about the first straight line.

[0008] Optionally, the cross-sectional shape of the first receiving groove is square, or the cross-sectional shape of the first receiving groove is a square with rounded corners at the four corners;

[0009] The cross-sectional shape of the second receiving groove is square, or the cross-sectional shape of the second receiving groove is a square with rounded corners at the four corners.

[0010] Optionally, the first straight line is the axis of symmetry of the first stamping crater, and the first straight line is the axis of symmetry of the second stamping crater;

[0011] The first stamping crater and the second stamping crater have the same shape and size.

[0012] Optionally, the first edge is parallel to the third edge, the second edge is parallel to the fourth edge, and the substrate is a rectangular sheet structure; the first stamping dent and the second stamping dent have the same shape and size, one side edge of the first stamping dent is parallel to the first edge, and one side edge of the second stamping dent is parallel to the first edge.

[0013] Optionally, the width of the first stamping dent along the first straight line is w, and the distance between the first edge and the edge of the first receiving groove adjacent to it is L, where w≤L;

[0014] The width of the connecting strip along the second direction is D, and the height of the first stamping dent along the second straight line is h, where h ≥ D.

[0015] Optionally, the width of the first stamping dent along the first straight line is within the range of 1mm to 10mm, and the height of the first stamping dent along the first straight line is within the range of 1.2mm to 2.5mm.

[0016] Optionally, the side of the first stamping pit away from the first edge is flush with the side of the first receiving groove near the first edge, the side of the first stamping pit away from the second edge is flush with the side of the first receiving groove near the second edge, and the side of the first stamping pit near the second edge is flush with the side of the second receiving groove away from the second edge.

[0017] The side of the second stamping pit away from the third edge is flush with the side of the first receiving groove near the third edge. The side of the second stamping pit away from the second edge is flush with the side of the first receiving groove near the second edge. The side of the second stamping pit near the second edge is flush with the side of the second receiving groove away from the second edge.

[0018] This utility model embodiment also provides a battery casing made of the above-mentioned substrate. The substrate is divided into a first part and a second part by the first straight line. After the substrate is folded along the first straight line, the first receiving groove and the second receiving groove are snapped together to form a receiving cavity for placing the electrode core. The first stamping pit and the second stamping pit are folded into the space between the first part and the second part.

[0019] The overlapping edges of the first and second portions are connected to form the battery casing.

[0020] On the other hand, this utility model embodiment also provides a battery, including a first tab, a second tab, a core, and the aforementioned battery casing;

[0021] The electrode core is disposed in the receiving cavity, the inner ends of the first electrode tab and the second electrode tab are connected to the electrode core, and the outer ends of the first electrode tab and the second electrode tab protrude out of the battery casing.

[0022] According to the housing structure and battery of this utility model embodiment, by additionally stamping a first stamping pit and a second stamping pit on the substrate, the concave direction of the first stamping pit is opposite to the concave direction of the first receiving groove. When the substrate is folded in half and packaged into the battery housing, the first stamping pit and the second stamping pit are folded into the battery housing. This can minimize the formation of the external protrusion in the prior art, avoid increasing the overall size of the battery due to the presence of the external protrusion, and thus improve the energy density of the battery. Attached Figure Description

[0023] Figure 1 A schematic diagram of the structure of the substrate before folding, according to an embodiment of the present invention;

[0024] Figure 2 A schematic diagram of the shell structure provided in an embodiment of this utility model;

[0025] Figure 3 This is a schematic diagram of the structure of the stamping pit folded into the first and second housings according to an embodiment of the present invention;

[0026] Figure 4 A schematic diagram of the dimensions of a stamping pit provided in an embodiment of this utility model.

[0027] Figure 5 Schematic diagram of the structure of the substrate in the prior art;

[0028] Figure 6 This is a schematic diagram of a shell structure in the prior art;

[0029] Figure 7 for Figure 6 A magnified view of a portion of the image;

[0030] Figure 8 This is a schematic diagram of the structure of the protruding part in the prior art.

[0031] The reference numerals in the drawings in the instruction manual are as follows: 100, first straight line; 200, second straight line; 300, outward protrusion; 400, receiving groove;

[0032] 1. Substrate; 101. First edge; 102. Second edge; 103. Third edge; 104. Fourth edge; 11. First part; 12. Second part; 13. First receiving groove; 14. Second receiving groove; 15. First stamping pit; 16. Second stamping pit; 17. Connecting strip; 2. First electrode tab; 3. Second electrode tab. Detailed Implementation

[0033] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0034] like Figures 1 to 4 As shown, an embodiment of the present invention provides a substrate for a battery casing. The substrate 1 is sheet-shaped, and its outer edge has a first edge 101, a second edge 102, a third edge 103, and a fourth edge 104 connected sequentially. The inner side of the outer edge of the substrate 1 is provided with a first receiving groove 13, a second receiving groove 14, a first stamping pit 15, and a second stamping pit 16 that are not interconnected. The substrate 1 can be folded along a first straight line 100. The first straight line 100 extends along a first direction and connects the first edge 101 and the third edge 103. The first receiving groove 13 and the second receiving groove 14 are disposed on both sides of the first straight line 100. The first receiving groove 13 and the second receiving groove 14 are spaced apart from each other in a second direction to form a connecting strip 17 extending along the first direction between them.

[0035] The first stamping pit 15 and the second stamping pit 16 are located on both sides of the connecting strip 17 in the first direction, and the first straight line 100 passes through the middle of the first stamping pit 15 and the middle of the second stamping pit 16; the first receiving groove 13 and the second receiving groove 14 have the same concave direction, the first stamping pit 15 and the second stamping pit 16 have the same concave direction, and the first receiving groove 13 has the opposite concave direction to the first stamping pit 15.

[0036] Reference Figure 1 and Figure 2 During encapsulation, the electrode core is placed in the first receiving groove 13 or the second receiving groove 14, and the substrate 1 is folded in half so that the substrate 1 forms a closed battery casing. The first receiving groove 13 and the second receiving groove 14 form a closed receiving cavity, and the electrode core is wrapped by the first receiving groove 13 and the second receiving groove 14 to form a soft pack battery.

[0037] Reference Figure 2 and Figure 3 Unlike existing technologies, in this embodiment, the first stamping dent and the first receiving groove 13 (second receiving groove 14) have different recess directions. After the substrate 1 is folded along the first straight line 100, the first stamping dent 15 and the second stamping dent are folded into the battery, so that one side edge of the battery casing where the first stamping dent 15 is located is coplanar, avoiding the outward protrusion 300 found in existing technologies. Furthermore, during packaging, because the recess direction of the first stamping dent 15 is different from that of the first receiving groove 13, it is easier to fold the first stamping dent 15 and the second stamping dent into the battery casing.

[0038] Reference Figure 1 As an example, the first receiving groove 13 and the second receiving groove 14 are symmetrically arranged about the first straight line 100. The cross-sectional shape of the first receiving groove 13 is a square with rounded corners at all four corners; the cross-sectional shape of the second receiving groove 14 is a square with rounded corners at all four corners. The first receiving groove 13 and the second receiving groove 14 have the same size and structure. After being symmetrical about the first straight line 100, the first receiving groove 13 and the second receiving groove 14 can form a receiving cavity with a regular shape and structure, and the first stamping pit 15 and the second stamping pit 16 are located on both sides of the connecting strip 17 along the first straight line 100.

[0039] In other embodiments, the cross-sectional shape of both the first receiving groove 13 and the second receiving groove 14 can be square.

[0040] As an example, the first straight line 100 is the axis of symmetry of the first stamping dent 15, and the first straight line 100 is also the axis of symmetry of the second stamping dent 16; the first stamping dent 15 and the second stamping dent 16 have the same shape and size. In this embodiment, the first stamping dent 15 and the second stamping dent 16 have the same size and structure, the first stamping dent 15 is symmetrical about the first straight line 100, and the second stamping dent 16 is symmetrical about the first straight line 100. This arrangement facilitates the folding operation during folding and sealing, and the folded battery has a regular shape and a neat and beautiful appearance.

[0041] As an example, the first edge 101 is parallel to the third edge 103, the second edge 102 is parallel to the fourth edge 104, and the substrate 1 is a rectangular sheet structure; the first stamping pit 15 and the second stamping pit 16 have the same shape and size, one side edge of the first stamping pit 15 is parallel to the first edge 101, and one side edge of the second stamping pit 16 is parallel to the first edge 101. In this embodiment, the first stamping pit 15, the second stamping pit 16, the first receiving groove 13, the second receiving groove 14, and the substrate 1 are all rectangular, and all five have parallel edges, making the battery casing appear as a cuboid or cube, which facilitates the arrangement of multiple batteries when forming a battery pack.

[0042] Reference Figure 4 As an example, the width of the first stamping dent 15 along the first straight line 100 is w, the distance between the first edge 101 and the edge of the adjacent first receiving groove 13 is L, w≤L; the width of the connecting strip 17 along the second direction is D, the height of the first stamping dent 15 along the second straight line 200 is h, h≥D, and the height of the second stamping dent 16 along the second straight line 200 is equal to the height of the first stamping dent 15 along the second straight line 200. Specifically, the width of the first stamping dent 15 along the first straight line 100 is within the range of 1mm~10mm, and the height of the first stamping dent 15 along the first straight line 100 is within the range of 1.2mm~2.5mm.

[0043] In this embodiment, since the first receiving groove 13 and the second receiving groove 14 have the same structure and are symmetrical about the first straight line 100, the distance between the fourth edge 104 and the edge of the adjacent first receiving groove 13 is equal to the distance between the second edge 102 and the edge of the adjacent second receiving groove 14, the distance between the first edge 101 and the edge of the adjacent second receiving groove 14 is equal to the distance L between the first edge 101 and the edge of the adjacent first receiving groove 13, and the distance between the third edge 103 and the edge of the adjacent second receiving groove 14 is equal to the distance between the first edge 101 and the edge of the adjacent first receiving groove 13.

[0044] As an example, the side of the first stamping pit 15 away from the first edge 101 is flush with the side of the first receiving groove 13 near the first edge 101; the side of the first stamping pit 15 away from the second edge 102 is flush with the side of the first receiving groove 13 near the second edge 102; and the side of the first stamping pit 15 near the second edge 102 is flush with the side of the second receiving groove 14 away from the second edge 102.

[0045] The side of the second stamping pit 16 away from the third edge 103 is flush with the side of the first receiving groove 13 near the third edge 103. The side of the second stamping pit 16 away from the second edge 102 is flush with the side of the first receiving groove 13 near the second edge 102. The side of the second stamping pit 16 near the second edge 102 is flush with the side of the second receiving groove 14 away from the second edge 102.

[0046] With the above configuration, after the substrate 1 is folded in half, the first stamping dent 15 and the second stamping dent 16 can be folded into the battery casing as much as possible.

[0047] In one embodiment, the present invention also provides a battery casing made of the aforementioned substrate 1. The substrate 1 is divided into a first part 11 and a second part 12 by the first straight line 100. After the substrate 1 is folded along the first straight line 100, the first receiving groove 13 and the second receiving groove 14 are fastened together to form a receiving cavity for placing the electrode core. The first stamping pit 15 and the second stamping pit 16 are folded into the space between the first part 11 and the second part 12.

[0048] The overlapping portions of the first part 11 and the second part 12 are connected to form the battery casing.

[0049] In one embodiment, the present invention also provides a battery, including a first tab 2, a second tab 3, an electrode core, and the battery casing described above;

[0050] The electrode core is disposed in the receiving cavity, the inner end of the first electrode tab 2 and the inner end of the second electrode tab 3 are connected to the electrode core, and the outer end of the first electrode tab 2 and the outer end of the second electrode tab 3 protrude from the battery casing.

[0051] In practical application, the existing battery without the first stamping indentation 15 and the second stamping indentation 16 has a thickness, width, and height of 5.32mm-64.5mm-77.9mm and an energy of 20.37Wh, resulting in an energy density of 762.2Wh / L. With the core size unchanged, adding the first stamping indentation 15 and the second stamping indentation 16 reduces the size of the two external protrusions 300, changing the battery size to 5.32mm-64.5mm-77.3mm. The optimized battery has an energy density of 768.1Wh / L, representing a 0.77% improvement in energy density compared to existing technologies.

[0052] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A substrate for a battery casing, characterized in that, The substrate (1) is sheet-shaped. The outer edge of the substrate (1) has a first edge (101), a second edge (102), a third edge (103) and a fourth edge (104) connected in sequence. The inner side of the outer edge of the substrate (1) is provided with a first receiving groove (13), a second receiving groove (14), a first stamping pit (15) and a second stamping pit (16) that are not interconnected. The substrate (1) can be folded along a first straight line (100). The first straight line (100) extends along a first direction and connects the first edge (101) and the third edge (103). The first receiving groove (13) and the second receiving groove (14) are arranged on both sides of the first straight line (100). The first receiving groove (13) and the second receiving groove (14) are spaced apart from each other in a second direction to form a connecting strip (17) extending along the first direction between them. The first stamping pit (15) and the second stamping pit (16) are located on both sides of the connecting strip (17) in the first direction. The first straight line (100) passes through the middle of the first stamping pit (15) and the middle of the second stamping pit (16). The first receiving groove (13) and the second receiving groove (14) have the same concave direction. The first stamping pit (15) and the second stamping pit (16) have the same concave direction. The first receiving groove (13) and the first stamping pit (15) have opposite concave directions.

2. The substrate according to claim 1, characterized in that, The first receiving groove (13) and the second receiving groove (14) are symmetrically arranged about the first straight line (100).

3. The substrate according to claim 1, characterized in that, The cross-sectional shape of the first receiving groove (13) is square or the cross-sectional shape of the first receiving groove (13) is a square with rounded corners at the four corners; The cross-sectional shape of the second receiving groove (14) is square or the cross-sectional shape of the second receiving groove (14) is a square with rounded corners at the four corners.

4. The substrate according to claim 1, characterized in that, The first straight line (100) is the axis of symmetry of the first stamping pit (15), and the first straight line (100) is the axis of symmetry of the second stamping pit (16); the second straight line (200) is flush with the edges of the first stamping pit (15) and the second stamping pit (16), and the first stamping pit (15) and the second stamping pit (16) have the same shape and size.

5. The substrate according to claim 1, characterized in that, The first edge (101) is parallel to the third edge (103), the second edge (102) is parallel to the fourth edge (104), and the substrate (1) is a rectangular sheet structure; the first stamping pit (15) and the second stamping pit (16) have the same shape and size, one side edge of the first stamping pit (15) is parallel to the first edge (101), and one side edge of the second stamping pit (16) is parallel to the first edge (101).

6. The substrate according to claim 4, characterized in that, The width of the first stamping pit (15) along the first straight line (100) is w, and the distance between the first edge (101) and the edge of the first receiving groove (13) adjacent to it is L, w≤L; The width of the connecting strip (17) along the second direction is D, and the height of the first stamping pit (15) along the second straight line (200) is h, where h ≥ D.

7. The substrate according to claim 1, characterized in that, The width of the first stamping dent (15) along the first straight line (100) is within the range of 1mm to 10mm, and the height of the first stamping dent (15) along the first straight line (100) is within the range of 1.2mm to 2.5mm.

8. The substrate according to claim 1, characterized in that, The side of the first stamping pit (15) away from the first edge (101) is flush with the side of the first receiving groove (13) near the first edge (101); the side of the first stamping pit (15) away from the second edge (102) is flush with the side of the first receiving groove (13) near the second edge (102); the side of the first stamping pit (15) near the second edge (102) is flush with the side of the second receiving groove (14) away from the second edge (102). The side of the second stamping pit (16) away from the third edge (103) is flush with the side of the first receiving groove (13) near the third edge (103). The side of the second stamping pit (16) away from the second edge (102) is flush with the side of the first receiving groove (13) near the second edge (102). The side of the second stamping pit (16) near the second edge (102) is flush with the side of the second receiving groove (14) away from the second edge (102).

9. A battery casing, characterized in that, Made from the substrate (1) according to any one of claims 1-8, the substrate (1) is divided into a first part (11) and a second part (12) by the first straight line (100), after the substrate (1) is folded along the first straight line (100), the first receiving groove (13) and the second receiving groove (14) are fastened to form a receiving cavity for placing the electrode core, and the first stamping pit (15) and the second stamping pit (16) are folded into the space between the first part (11) and the second part (12); The overlapping portions of the first part (11) and the second part (12) are connected to form the battery casing.

10. A battery, characterized in that, Includes a first tab (2), a second tab (3), a core, and the battery casing as described in claim 9; The electrode core is disposed in the receiving cavity, the inner end of the first electrode tab (2) and the inner end of the second electrode tab (3) are connected to the electrode core, and the outer end of the first electrode tab (2) and the outer end of the second electrode tab (3) protrude from the battery casing.

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