Battery shell, battery and battery preparation method

Abstract

The invention provides a battery shell, a battery and a battery preparation method, the battery shell extends along a curve, the battery shell comprises a first side plate and a second side plate, and the first side plate comprises a first curved plate; the second side plate comprises a second curved surface plate, the concave curved surface of the second curved surface plate and the convex curved surface of the first curved surface plate are oppositely spaced and form an accommodating space extending along a curve, and the accommodating space is used for accommodating a battery cell; the side, facing the second side plate, of the first side plate is provided with a first sealing layer, the side, facing the first side plate, of the second side plate is provided with a second sealing layer, and at least one side edge of the first sealing layer is welded to the edge of the second sealing layer. According to the battery shell, the battery and the preparation method of the battery provided by the embodiment of the invention, the problems that the battery shell is wrinkled due to the fact that the battery is integrally bent after being packaged, and a battery cell has the phenomena of pole piece powder falling, diaphragm puncturing and the like can be avoided, and the stability of the battery is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery casing, a battery, and a battery preparation method. Background Art

[0002] With the development of technology, new electronic products with curved shapes such as smart bracelets and smart rings are emerging in an endless stream. In order to improve the space utilization of curved electronic products, it is necessary to use curved batteries with a certain curvature to cooperate. In related technologies, the battery core is usually installed in the battery housing, and the battery is bent as a whole to form a curved battery with a certain curvature. This is prone to problems such as powder falling off the pole piece inside the battery and puncturing the diaphragm, thereby affecting the reliability of the battery. Summary of the invention

[0003] The embodiments of the present application provide a battery housing, a battery, and a battery preparation method, which can improve the technical problem in the related art that the battery reliability is affected after the battery is bent.

[0004] In a first aspect, an embodiment of the present application provides a battery housing extending along a curve, comprising:

[0005] A first side panel, comprising a first curved panel;

[0006] A second side plate, comprising a second curved plate, wherein a concave surface of the second curved plate is spaced relative to a convex surface of the first curved plate and forms a receiving space extending along the curve, wherein the receiving space is used to receive the battery cell;

[0007] A first sealing layer is disposed on the side of the first side plate facing the second side plate, a second sealing layer is disposed on the side of the second side plate facing the first side plate, and at least one side edge of the first sealing layer is welded to an edge of the second sealing layer.

[0008] In one embodiment, one end of the first curved plate along the extending direction of the curve is integrally connected to the second curved plate;

[0009] The edges of the first sealing layer on both sides along the width direction of the battery housing are welded to the edges of the second sealing layer, and the width direction is perpendicular to the plane where the curve is located; and / or,

[0010] An edge of the first sealing layer close to the other end of the first curved plate along the extending direction of the curve is welded to an edge of the second sealing layer.

[0011] In one embodiment, a first connecting plate is provided at the other end of the first curved plate along the direction in which the curve extends, and a second connecting plate is provided at the other end of the second curved plate along the direction in which the curve extends, and the first connecting plate and the second connecting plate are arranged opposite to each other;

[0012] The first sealing layer includes a first welding portion located on the first connecting plate toward the second connecting plate, and the second sealing layer includes a second welding portion located on the second connecting plate toward the first connecting plate, and the first welding portion is welded to the second welding portion.

[0013] In one embodiment, a through hole is formed between the first connecting plate and the second connecting plate, the through hole is communicated with the accommodating space, and the through hole is used for a tab of the battery cell to pass through.

[0014] In one embodiment, the first curved plate is provided with third connecting plates at both ends along the width direction, and the second curved plate is provided with fourth connecting plates at both ends along the width direction, and the two third connecting plates and the two fourth connecting plates are arranged in a one-to-one correspondence with each other.

[0015] The first sealing layer includes a third welding portion located on the third connecting plate toward the fourth connecting plate, and the second sealing layer includes a fourth welding portion located on the fourth connecting plate toward the third connecting plate, and the third welding portion is welded to the fourth welding portion.

[0016] In one embodiment, the third connecting plate is substantially perpendicular to the width direction.

[0017] In one embodiment, one end of the first curved plate along the width direction of the battery housing is integrally connected to the second curved plate, and the width direction is perpendicular to the plane where the curve is located;

[0018] The edges of the first sealing layer on both sides along the extending direction of the curve are welded to the edge of the second sealing layer; and / or,

[0019] An edge of the first sealing layer close to the other end of the first curved plate along the width direction is welded to an edge of the second sealing layer.

[0020] In one embodiment, the material of the first sealing layer and / or the second sealing layer includes resin.

[0021] In one embodiment, the first side plate comprises a first supporting layer and a first insulating layer stacked in a direction away from the first sealing layer, and the material of the first supporting layer comprises metal; and / or,

[0022] The second side plate includes a second supporting layer and a second insulating layer stacked in a direction away from the second sealing layer, and the material of the second supporting layer includes metal.

[0023] In a second aspect, an embodiment of the present application provides a battery, comprising:

[0024] A battery case, wherein the battery case is the battery case as described above, the battery case extends along a curve, the battery case comprises a first side plate and a second side plate, the first side plate comprises a first curved plate; the second side plate comprises a second curved plate, the concave surface of the second curved plate is relatively spaced from the convex surface of the first curved plate, and forms an accommodation space extending along the curve, the accommodation space is used to accommodate a battery cell; wherein a first sealing layer is provided on a side of the first side plate facing the second side plate, a second sealing layer is provided on a side of the second side plate facing the first side plate, and at least one side edge of the first sealing layer is fused to an edge of the second sealing layer;

[0025] The battery cell is arranged in the accommodation space of the battery casing.

[0026] In a third aspect, an embodiment of the present application provides a method for preparing a battery, the method comprising:

[0027] A housing substrate is provided, the housing substrate comprising a first side plate and a second side plate, the first side plate comprising a first curved plate; the second side plate comprising a second curved plate, a first sealing layer being provided on one side of the first side plate, and a second sealing layer being provided on one side of the second side plate;

[0028] The first side plate and the second side plate are arranged opposite to each other, so that the concave surface of the second curved plate is spaced opposite to the convex surface of the first curved plate, so that the first sealing layer is located on the side of the first side plate facing the second side plate, the second sealing layer is located on the side of the second side plate facing the first side plate, and a receiving space extending along the curve is formed between the first curved plate and the second curved plate;

[0029] The battery cell is placed in the accommodation space, and at least one side edge of the first sealing layer and the edge of the second sealing layer are welded to form a battery extending along the curve.

[0030] In one embodiment, the housing substrate is an integrated structure; the first side plate and the second side plate are arranged relatively to each other, including:

[0031] The connection between the first side plate and the second side plate is bent so that the first side plate and the second side plate are arranged opposite to each other.

[0032] In one embodiment, one end of the first curved plate along the direction in which the curve extends is integrally connected to the second curved plate; the tab of the battery cell is close to the other end of the first curved plate along the direction in which the curve extends; the battery cell is placed in the accommodation space, and at least one side edge of the first sealing layer and the edge of the second sealing layer are welded to form a battery extending along the curve, comprising:

[0033] Placing a battery cell in the accommodation space, wherein the battery cell extends along the curve;

[0034] Welding the edge of the first sealing layer close to the other end of the first curved plate along the extending direction of the curve to the edge of the second sealing layer;

[0035] Welding one side edge of the first sealing layer along the width direction of the battery housing to the edge of the second sealing layer, wherein the width direction is perpendicular to the plane where the curve is located;

[0036] Injecting electrolyte into the accommodation space from a gap between the second sealing layer and the other side edge of the first sealing layer along the width direction;

[0037] The other side edge of the first sealing layer along the width direction of the battery case is welded to the edge of the second sealing layer.

[0038] In one embodiment, the first curved plate is provided with a third connecting plate at both ends along the width direction, and the second curved plate is provided with a fourth connecting plate at both ends along the width direction, and the third connecting plate and the fourth connecting plate are arranged opposite to each other; the step of welding one side edge of the first sealing layer along the width direction of the battery housing to the edge of the second sealing layer includes:

[0039] Clamp the heating end cap on surfaces of one of the third connecting plates and the corresponding fourth connecting plate which are away from each other; wherein the heating end cap extends along the curve;

[0040] The heating head is used to heat the first sealing layer and the second sealing layer between the third connecting plate and the corresponding fourth connecting plate to weld one side edge of the first sealing layer along the width direction of the battery casing to the edge of the second sealing layer.

[0041] Beneficial effects of the embodiments of the present application:

[0042] In an embodiment of the present application, a convex surface of a first curved plate of a first side plate of a battery housing is spaced relatively from a concave surface of a second curved plate of a second side plate to form a storage space extending along a curve and used to store battery cells, and at least one side edge of a first sealing layer of the first side plate facing the second side plate is welded to an edge of a second sealing layer of the second side plate facing the first side plate. Thus, the first side plate and the second side plate structure of the battery housing can be formed by processing first, and after the battery cells are installed in the storage space between the first side plate and the second side plate, at least one side edge of the first sealing layer and the edge of the second sealing layer are welded to seal the battery housing, thereby realizing the packaging of the battery housing and the battery cells to form a battery. In this process, there is no need to bend the battery as a whole, so that the battery housing wrinkles caused by bending the battery as a whole after packaging is completed, and the problems of the battery cell losing powder and puncturing the diaphragm can be avoided, thereby improving the stability of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0044] Figure 1 is a schematic structural diagram of an embodiment of a battery provided in an embodiment of the present application;

[0045] Figure 2 yes Figure 1 A cross-sectional view of a battery, wherein the cross-sectional plane is perpendicular to the width direction of the battery shell;

[0046] Figure 3 yes Figure 2 The enlarged view of point A in the middle;

[0047] Figure 4 yes Figure 1 A cross-sectional view of a battery, wherein the cutting plane is parallel to the width direction of the battery;

[0048] Figure 5 yes Figure 4 The enlarged view of point B in the middle;

[0049] Figure 6 is a cross-sectional view of a first side panel provided in an embodiment of the present application;

[0050] Figure 7 It is a flow chart of an embodiment of a battery preparation method provided in an embodiment of the present application.

[0051] Battery 100; battery case 110; accommodating space 1100; through hole 1101; first side plate 111; first curved plate 1111; first sealing layer 1112; first welding portion 1113; first connecting plate 1114; third connecting plate 1115; first supporting layer 1116; first insulating layer 1117; connecting side plate 1118; second side plate 112; second curved plate 1121; second sealing layer 1122; second welding portion 1123; second connecting plate 1124; fourth connecting plate 1125; battery cell 120; pole ear 121; curve L. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise stated, the directional words such as "upper" and "lower" used generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0053] Embodiments of the present application provide a battery housing, a battery, and a battery preparation method.

[0054] Figure 1 A schematic structural diagram of an embodiment of a battery provided in an embodiment of the present application. Figure 2 yes Figure 1 A cross-sectional view of a battery in FIG. 1 , wherein the cross-sectional view is perpendicular to the width direction of the battery shell. Figure 1 and Figure 2 As shown, the battery 100 includes a battery housing 110 and a battery cell 120. The battery housing 110 includes a receiving space 1100, and the battery cell 120 is disposed in the receiving space 1100 of the battery housing 110. The battery 100 extends along a curve L to form a curved battery 100, so that the battery 100 can be adapted to electronic products with a certain curvature or other equipment that requires the battery 100 to be curved.

[0055] like Figure 1 and Figure 2As shown, the battery housing 110 of the battery 100 extends along the curve L. The battery housing 110 may include a first side plate 111 and a second side plate 112, the first side plate 111 includes a first curved plate 1111, one side of the first curved plate 1111 is a convex curved surface, and the other side of the first curved plate 1111 is a concave curved surface. The second side plate 112 includes a second curved plate 1121, one side of the second curved plate 1121 is a convex curved surface, and the other side of the second curved plate 1121 is a concave curved surface. The concave surface of the second curved plate 1121 is relatively spaced from the convex surface of the first curved plate 1111, and forms a receiving space 1100 extending along the curve L, and the receiving space 1100 is used to receive the battery cell 120.

[0056] It should be noted that the curve L may be an arc with a fixed curvature or a curve L with a non-fixed curvature, which may be determined according to the product structure to which the battery 100 is applied.

[0057] In some embodiments, a first sealing layer 1112 may be provided on the side of the first side plate 111 of the battery housing 110 facing the second side plate 112, and a second sealing layer 1122 may be provided on the side of the second side plate 112 facing the first side plate 111, and at least one side edge of the first sealing layer 1112 and the edge of the second sealing layer 1122 may be welded.

[0058] The battery case 110 provided in the embodiment of the present application forms an accommodating space 1100 extending along a curve L and used to accommodate the battery cell 120 by relatively spacing the convex surface of the first curved plate 1111 of the first side plate 111 and the concave surface of the second curved plate 1121 of the second side plate 112, and welds at least one side edge of the first sealing layer 1112 of the first side plate 111 toward the second side plate 112 to the edge of the second sealing layer 1122 of the second side plate 112 toward the first side plate 111. Thus, the first side plate 111 and the second side plate 112 structure of the battery case 110 can be formed by processing first, and after the battery cell 120 is installed in the accommodating space 1100 between the first side plate 111 and the second side plate 112, at least one side edge of the first sealing layer 1112 and the edge of the second sealing layer 1122 are welded to seal the battery case 110, thereby realizing the packaging of the battery case 110 and the battery cell 120 to form the battery 100. In this process, there is no need to bend the battery 100 as a whole. Therefore, it is possible to avoid wrinkles in the battery case 110 caused by bending the battery 100 as a whole after packaging, and problems such as powder falling of the pole piece and puncture of the diaphragm of the battery cell 120, thereby improving the stability of the battery 100.

[0059] It should be noted that one side edge of the first sealing layer 1112 and the edge of the second sealing layer 1122 may be welded, or two side edges, three side edges, or four side edges of the first sealing layer 1112 may be welded to the edge of the second sealing layer 1122. When one or more side edges of the first sealing layer 1112 are not welded to the edge of the second sealing layer 1122, the one or more side edges of the battery housing 110 may be sealed by other sealing methods.

[0060] In some embodiments, the first curved panel 1111 may be integrally connected to the second curved panel 1121 at one end along the direction in which the curve L extends. That is, the first side panel 111 and the second side panel 112 are integrally connected at one end along the direction in which the curve L extends. Thus, after the first side panel 111 and the second side panel 112 are processed to form the first curved panel 1111 and the second curved panel 1121, the connection between the first side panel 111 and the second side panel 112 is bent, so that the convex surface of the first curved panel 1111 of the first side panel 111 and the concave surface of the second curved panel 1121 of the second side panel 112 are relatively spaced, which is conducive to simplifying the processing steps of the battery housing 110, and at the same time, improving the connection strength of the first side panel 111 and the second side panel 112. Moreover, the battery housing 110 has a higher sealing performance at the end where the first side panel 111 and the second side panel 112 are integrally connected.

[0061] The two side edges of the first sealing layer 1112 along the width direction of the battery housing 110 can be welded to the edge of the second sealing layer 1122, and the width direction is perpendicular to the plane where the curve L is located. In this way, the two side edges of the first side plate 111 and the second side plate 112 along the width direction of the battery housing 110 can be sealed. In addition, the edge of one side of the first sealing layer 1112 close to the other end of the first curved plate 1111 along the extension direction of the curve L can be welded to the edge of the second sealing layer 1122, thereby sealing the first side plate 111 and the second side plate 112.

[0062] It should be noted that the edges of both sides of the first sealing layer 1112 along the width direction of the battery housing 110 can be welded to the edge of the second sealing layer 1122 at the same time, and the edge of one side of the first sealing layer 1112 close to the other end of the first curved plate 1111 along the extension direction of the curve L can be welded to the edge of the second sealing layer 1122, or only the edges of both sides of the first sealing layer 1112 along the width direction of the battery housing 110 can be welded to the edge of the second sealing layer 1122, or only the edge of one side of the first sealing layer 1112 close to the other end of the first curved plate 1111 along the extension direction of the curve L can be welded to the edge of the second sealing layer 1122. Of course, the former can further improve the sealing effect on the edges of each side of the battery housing 110, and make the sealing of each side of the battery housing 110 simpler and more convenient.

[0063] In some embodiments, Figure 2 and Figure 3 As shown, a first connecting plate 1114 may be provided at the other end of the first curved plate 1111 of the first side plate 111 in the direction in which the curve L extends, and a second connecting plate 1124 may be provided at the other end of the second curved plate 1121 in the direction in which the curve L extends, and the first connecting plate 1114 and the second connecting plate 1124 are arranged opposite to each other. The first connecting plate 1114 of the first side plate 111 and the second connecting plate 1124 of the second side plate 112 are located at the same end of the battery housing 110 in the direction in which the curve L extends. When one end of the first curved plate 1111 in the direction in which the curve L extends is integrally connected to the second curved plate 1121, that is, when one end of the first side plate 1111 and the second side plate 112 in the direction in which the curve L extends are integrally connected, the first connecting plate 1114 and the second connecting plate 1124 are located at one end of the battery housing 110 away from the integral connection of the first curved plate 1111 and the second curved plate 1121.

[0064] The first sealing layer 1112 includes a first welding portion 1113 located from the first connecting plate 1114 toward the second connecting plate 1124, the second sealing layer 1122 includes a second welding portion 1123 located from the second connecting plate 1124 toward the first connecting plate 1114, and the first welding portion 1113 is welded to the second welding portion 1123. Thus, the first side plate 111 and the second side plate 112 can be heat-sealed at one end away from the integral connection between the first curved plate 1111 and the second curved plate 1121, and the operation is very convenient.

[0065] Among them, the surfaces of the first connecting plate 1114 and the second connecting plate 1124 facing away from each other can be clamped by a heat sealing chuck (not shown in the figure) to make the first welding portion 1113 of the first sealing layer 1112 and the second welding portion 1123 of the second sealing layer 1122 contact each other, and then, the first connecting plate 1114 and the second connecting plate 1124 are heated, thereby heating the first welding portion 1113 and the second welding portion 1123 to melt the first welding portion 1113 and the second welding portion 1123, thereby achieving the welding of the first sealing layer 1112 and the second sealing layer 1122 near the other end of the first curved plate 1111 along the extension direction of the curve L.

[0066] Continue to refer to Figure 2 and Figure 3 , a through hole 1101 is formed between the first connecting plate 1114 and the second connecting plate 1124, the through hole 1101 is communicated with the accommodation space 1100, and the through hole 1101 is used to allow the tab 121 of the battery cell 120 to pass through. Therefore, after the battery cell 120 is installed in the accommodation space 1100 of the battery housing 110, the tab 121 of the battery cell 120 can pass through the through hole 1101 and extend out of the battery housing 110, so as to facilitate the electrical connection of the tab 121 of the battery cell 120 with the electronic device.

[0067] Among them, a part of the sealing structure formed by the welding of the first welding part 1113 and the second welding part 1123 is filled between the pole ear 121 and the inner circumference of the through hole 1101 to seal the gap between the pole ear 121 and the inner circumference of the through hole 1101. Specifically, two through holes 1101 are formed between the first connecting plate 1114 and the second connecting plate 1124. The two through holes 1101 are sequentially distributed along the width direction of the battery housing 110. The two pole ears 121 of the battery cell 120 with opposite polarities pass through the two through holes 1101 one by one. The inner circumference of the two through holes 1101 and the corresponding pole ears 121 are sealed by the sealing structure.

[0068] In other embodiments, a through hole 1101 may be formed between the first connecting plate 1114 and the second connecting plate 1124, and two pole ears 121 with opposite polarities of the battery cell 120 pass through the through hole 1101, and the two pole ears 121 and the inner circumference of the through hole 1101 are sealed by a sealing structure.

[0069] In some embodiments, Figure 4 and Figure 5 As shown, a third connecting plate 1115 may be provided at both ends of the first curved plate 1111 along the width direction of the battery housing 110, and a fourth connecting plate 1125 may be provided at both ends of the second curved plate 1121 along the width direction, and the two third connecting plates 1115 and the two fourth connecting plates 1125 are arranged one by one in a corresponding manner. The correspondingly arranged third connecting plates 1115 and fourth connecting plates 1125 are located at the same end of the battery housing 110 along the width direction.

[0070] Continue to refer to Figure 4 and Figure 5 , the first sealing layer 1112 includes a third welding portion located from the third connecting plate 1115 toward the fourth connecting plate 1125, the second sealing layer 1122 includes a fourth welding portion located from the fourth connecting plate 1125 toward the third connecting plate 1115, and the third welding portion is welded to the fourth welding portion. Thus, the first side plate 111 and the second side plate 112 can be heat-sealed on both sides along the width direction of the battery case 110, and the operation is very convenient.

[0071] Among them, the surfaces of the third connecting plate 1115 and the fourth connecting plate 1125 facing away from each other can be clamped by a heat sealing chuck, so that the third welding part of the first sealing layer 1112 and the fourth welding part of the second sealing layer 1122 are in contact, and then the third connecting plate 1115 and the fourth connecting plate 1125 are heated, so as to heat the third welding part and the fourth welding part, so that the third welding part and the fourth welding part are welded, and the edges of the first sealing layer 1112 on both sides along the width direction of the battery shell 110 are welded with the edges of the second sealing layer 1122.

[0072] In some implementations, the third connecting plate 1115 can be made substantially perpendicular to the width direction. Thus, the overall width of the battery housing 110 in the width direction can be reduced, which is conducive to reducing the installation space occupied by the battery housing 110. Among them, after the third welding portion and the fourth welding portion between the third connecting plate 1115 and the fourth connecting plate 1125 are welded, the third connecting plate 1115 and the fourth connecting plate 1125 can be bent along the thickness direction of the battery 100, so that the plate surface of the third connecting plate 1115 is substantially perpendicular to the width direction of the battery housing 110, thereby reducing the overall width of the battery housing 110 without increasing the thickness of the battery housing 110.

[0073] Specifically, the first side panel 111 includes a connecting side panel 1118 extending from the four edges of the first curved panel 1111 toward the second curved panel 1121, and one end of the connecting side panel 1118 away from the first curved panel 1111 is connected to the second side panel 112, the first connecting panel 1114 or the third connecting panel 1115. The connecting side panel 1118 located at one end of the first curved panel 1111 along the extending direction of the curve L is integrally connected to the second side panel 112, the connecting side panel 1118 located at the other end of the first curved panel 1111 along the extending direction of the curve L is connected to the first connecting panel 1114, and the connecting side panels 1118 located at both ends of the first curved panel 1111 along the width direction are connected to two third connecting panels 1115. The first curved panel 1111, the connecting side panel 1118 and the second curved panel 1121 enclose a receiving space 1100.

[0074] In other embodiments, the first curved plate 1111 of the first side plate 111 can be integrally connected to the second curved plate 1121 at one end along the width direction of the battery housing 110, and the width direction of the battery housing 110 is perpendicular to the plane where the curve L is located. That is, the first side plate 111 and the second side plate 112 are integrally connected at one end along the width direction of the battery housing 110. Thus, after the first side plate 111 and the second side plate 112 are processed to form the first curved plate 1111 and the second curved plate 1121, the connection between the first side plate 111 and the second side plate 112 is bent, so that the convex surface of the first curved plate 1111 of the first side plate 111 and the concave surface of the second curved plate 1121 of the second side plate 112 are relatively spaced, which is conducive to simplifying the processing steps of the battery housing 110, and at the same time, improving the connection strength of the first side plate 111 and the second side plate 112. Moreover, the battery housing 110 has a higher sealing performance at the end where the first side plate 111 and the second side plate 112 are integrally connected.

[0075] The edges of the first sealing layer 1112 on both sides along the extension direction of the curve L are welded to the edges of the second sealing layer 1122, thereby sealing the edges of the battery housing 110 on both sides along the extension direction of the curve L. In addition, the edge of the first sealing layer 1112 on one side close to the other end of the first curved plate 1111 along the width direction may be welded to the edge of the second sealing layer 1122, thereby sealing the edge of the battery housing 110 on one side close to the other end of the first curved plate 1111 along the width direction.

[0076] It should be noted that both side edges of the first sealing layer 1112 along the extension direction of the curve L can be welded to the edge of the second sealing layer 1122 at the same time, and one side edge of the first sealing layer 1112 close to the other end of the first curved plate 1111 along the width direction can be welded to the edge of the second sealing layer 1122, or only the two side edges of the first sealing layer 1112 along the extension direction of the curve L can be welded to the edge of the second sealing layer 1122, or only the one side edge of the first sealing layer 1112 close to the other end of the first curved plate 1111 along the width direction can be welded to the edge of the second sealing layer 1122. Of course, the former can further improve the sealing effect on the edges of each side of the battery housing 110, and make the sealing of each side of the battery housing 110 simpler and more convenient.

[0077] In some embodiments, the material of the first sealing layer 1112 and / or the second sealing layer 1122 can include resin, so that the edges of the first sealing layer 1112 and the second sealing layer 1122 can be more easily welded together, and the sealing effect of the edge of the battery casing 110 after the first sealing layer 1112 and the second sealing layer 1122 are welded is improved.

[0078] In some embodiments, Figure 6 As shown, the first side plate 111 may include a first support layer 1116 and a first insulating layer 1117 stacked in a direction away from the first sealing layer 1112, and the material of the first support layer 1116 includes metal. Thus, the first side plate 111 may have higher strength and insulation performance, thereby improving the safety performance of the battery 100.

[0079] Similarly, the second side plate 112 may include a second supporting layer and a second insulating layer stacked in a direction away from the second sealing layer 1122 , and the material of the second supporting layer includes metal, so that the second side plate 112 has higher strength and insulation performance, thereby improving the safety performance of the battery 100 .

[0080] In some embodiments, the core of the battery cell 120 can be formed by stacking and winding a positive electrode sheet, a negative electrode sheet, and a separator disposed between the positive electrode sheet and the negative electrode sheet. The tabs of the battery cell 120 include a positive tab and a negative tab, the positive tab is electrically connected to the positive electrode sheet, and the negative tab is electrically connected to the negative electrode sheet. Protective tape can also be wound around the periphery of the core to protect the core. A tailing tape can also be provided at the winding end of the core to prevent the core from spreading.

[0081] An embodiment of the present application also provides a battery, which includes a battery shell. The specific structure of the battery shell refers to the above embodiment. Since the battery adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0082] The battery 100 may include a battery housing 110 and a battery cell 120. The structure of the battery housing 110 may refer to the above embodiments, and the battery cell 120 is disposed in the accommodating space 1100 of the battery housing 110. The structure and connection method of the battery cell 120 and the battery housing 110 may refer to the embodiments of the present application, and will not be described in detail here.

[0083] In order to better prepare the battery housing 110 provided in the embodiment of the present application, the present application also provides a battery preparation method. Figure 7 As shown, the battery preparation method may include steps S210 to S230, which are described in detail as follows:

[0084] S210. Provide a shell substrate, the shell substrate includes a first side plate 111 and a second side plate 112, the first side plate 111 includes a first curved plate 1111; the second side plate 112 includes a second curved plate 1121, a first sealing layer 1112 is provided on one side of the first side plate 111, and a second sealing layer 1122 is provided on one side of the second side plate 112.

[0085] The structures and materials of the first curved panel 1111 , the second curved panel 1121 , the first sealing layer 1112 , and the second sealing layer 1122 may refer to the above-mentioned embodiments.

[0086] S220, the first side panel 111 and the second side panel 112 are arranged opposite to each other, so that the concave surface of the second curved panel 1121 is relatively spaced from the convex surface of the first curved panel 1111, so that the first sealing layer 1112 is located on the side of the first side panel 111 facing the second side panel 112, the second sealing layer 1122 is located on the side of the second side panel 112 facing the first side panel 111, and a receiving space 1100 extending along the curve L is formed between the first curved panel 1111 and the second curved panel 1121.

[0087] S230 , placing the battery cell 120 in the accommodation space 1100 , and welding at least one side edge of the first sealing layer 1112 and the edge of the second sealing layer 1122 to form a battery 100 extending along the curve L.

[0088] The battery preparation method provided in the embodiment of the present application comprises the following steps: a first side plate 111 having a first curved plate 1111 and a second side plate 112 having a second curved plate 1121 are arranged opposite to each other, so that the concave surface of the second curved plate 1121 is spaced apart from the convex surface of the first curved plate 1111, and a receiving space 1100 extending along a curve L is formed between the first curved plate 1111 and the second curved plate 1121, and the first sealing layer 1112 is located on a side of the first side plate 111 facing the second side plate 112, and the second sealing layer 1122 is located on a side of the second side plate 112 facing the first side plate 111 On one side, when the battery cell 120 is placed in the accommodating space 1100, the battery case 110 can be sealed by welding at least one side edge of the first sealing layer 1112 and the edge of the second sealing layer 1122, so that the battery case 110 and the battery cell 120 are packaged to form a battery 100. In this process, there is no need to bend the battery 100 as a whole. Therefore, it is possible to avoid wrinkles in the battery case 110 caused by bending the battery 100 as a whole after packaging, and problems such as powder falling of the electrode piece and puncture of the diaphragm of the battery cell 120, thereby improving the stability of the battery 100.

[0089] In some embodiments, the housing substrate may be an integral structure. The above-mentioned step of relatively arranging the first side plate 111 and the second side plate 112 may include: bending the connection between the first side plate 111 and the second side plate 112 so that the first side plate 111 and the second side plate 112 are relatively arranged. Thus, after the first side plate 111 and the second side plate 112 are processed to form the first curved plate 1111 and the second curved plate 1121, the connection between the first side plate 111 and the second side plate 112 is bent, so that the convex surface of the first curved plate 1111 of the first side plate 111 and the concave surface of the second curved plate 1121 of the second side plate 112 are relatively spaced, which is conducive to simplifying the processing steps of the battery housing 110, and at the same time, improving the connection strength of the first side plate 111 and the second side plate 112. Moreover, the battery housing 110 has a higher sealing performance at one end where the first side plate 111 and the second side plate 112 are integrally connected.

[0090] The side edge of the first side plate 111 of the housing substrate can be integrally connected to the side edge of the second side plate 112. Specifically, the side edge of the first side plate 111 in the length direction can be integrally connected to the side edge of the second side plate 112 in the length direction, or the side edge of the first side plate 111 in the width direction can be integrally connected to the side edge of the second side plate 112 in the width direction.

[0091] In some embodiments, one end of the first curved plate 1111 along the extension direction of the curve L can be integrally connected to the second curved plate 1121. The tab 121 of the battery cell 120 is close to the other end of the first curved plate 1111 along the extension direction of the curve L. The step of placing the battery cell 120 in the accommodating space 1100 and welding at least one side edge of the first sealing layer 1112 and the edge of the second sealing layer 1122 to form the battery 100 extending along the curve L may include steps S231 to S235, which are described in detail as follows:

[0092] S231 , placing the battery cell 120 in the accommodation space 1100 , wherein the battery cell 120 extends along the curve L.

[0093] The battery cell 120 may be installed in the accommodation space 1100 from the opening on the side of the battery housing 110 that is not heat-sealed. The battery cell 120 may be bent in advance to form a curved battery cell 120 extending along the curve L. For example, the battery cell 120 may be installed in the accommodation space 1100 from the opening on one side of the battery housing 110 in the width direction, or the battery cell 120 may be installed in the accommodation space 1100 from the opening on one side of the battery housing 110 in the direction in which the curve L extends.

[0094] S232 , welding the edge of the first sealing layer 1112 close to the other end of the first curved plate 1111 along the extension direction of the curve L to the edge of the second sealing layer 1122 .

[0095] By welding the edge of the first sealing layer 1112 close to the other end of the first curved plate 1111 along the extension direction of the curve L to the edge of the second sealing layer 1122, the end of the battery housing 110 away from the integral connection between the first side plate 111 and the second side plate 112 can be sealed.

[0096] S233, welding one side edge of the first sealing layer 1112 along the width direction of the battery housing 110 to the edge of the second sealing layer 1122, wherein the width direction is perpendicular to the plane where the curve L is located.

[0097] By welding one side edge of the first sealing layer 1112 along the width direction of the battery shell 110 to the edge of the second sealing layer 1122, one side edge of the battery shell 110 along the width direction can be sealed. At this time, the other side edge of the battery shell 110 along the width direction is formed with an opening connected to the accommodating space 1100.

[0098] S234 , injecting electrolyte into the accommodation space 1100 from the gap between the other side edge of the first sealing layer 1112 and the second sealing layer 1122 along the width direction.

[0099] Before injecting the electrolyte into the accommodation space 1100, the battery housing 110 and the battery cell 120 may be baked to remove excess moisture in the accommodation space 1100. In addition, after injecting the electrolyte, the battery housing 110 may be placed in a vacuum environment to facilitate heat sealing of the battery housing 110.

[0100] S235 , welding the other side edge of the first sealing layer 1112 along the width direction of the battery housing 110 to the edge of the second sealing layer 1122 .

[0101] By welding the other side edge of the first sealing layer 1112 along the width direction of the battery housing 110 to the edge of the second sealing layer 1122, the edges of the battery housing 110 can be sealed, so that the battery housing 110 and the battery cell 120 are packaged to form a battery 100 extending along the curve L.

[0102] In some embodiments, the first curved plate 1111 may be provided with a third connecting plate 1115 at both ends along the width direction, and the second curved plate 1121 may be provided with a fourth connecting plate 1125 at both ends along the width direction, and the third connecting plate 1115 and the fourth connecting plate 1125 may be arranged opposite to each other. The step of welding one side edge of the first sealing layer 1112 along the width direction of the battery housing 110 to the edge of the second sealing layer 1122 may include:

[0103] S2331. Clamp the heating head on surfaces of one of the third connecting plates 1115 and the corresponding fourth connecting plate 1125 that are away from each other; wherein the heating head extends along the curve L.

[0104] S2332, heat the first sealing layer 1112 and the second sealing layer 1122 located between the third connecting plate 1115 and the corresponding fourth connecting plate 1125 by heating the sealing head to weld one side edge of the first sealing layer 1112 along the width direction of the battery shell 110 to the edge of the second sealing layer 1122.

[0105] Since the heating head also extends along the curve L, when the heating head is clamped on the surfaces of one of the third connecting plates 1115 and the corresponding fourth connecting plate 1125 that are opposite to each other, the shape of the heating head is adapted to the shapes of the first connecting plate 1114 and the second connecting plate 1124, which can avoid the problem of deformation of the first side plate 111 and the second side plate 112 after the heating head is clamped on the surfaces of one of the third connecting plates 1115 and the corresponding fourth connecting plate 1125 that are opposite to each other, which is beneficial to improving the structural stability of the battery case 110 during the heat sealing process.

[0106] The embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A battery housing extending along a curve, characterized in that: include: A first side panel, comprising a first curved panel; A second side plate, comprising a second curved plate, wherein a concave surface of the second curved plate is spaced relative to a convex surface of the first curved plate and forms a receiving space extending along the curve, wherein the receiving space is used to receive the battery cell; A first sealing layer is disposed on the side of the first side plate facing the second side plate, a second sealing layer is disposed on the side of the second side plate facing the first side plate, and at least one side edge of the first sealing layer is welded to an edge of the second sealing layer.

2. The battery case according to claim 1, characterized in that: One end of the first curved plate along the extending direction of the curve is integrally connected to the second curved plate; The edges of the first sealing layer on both sides along the width direction of the battery housing are welded to the edges of the second sealing layer, and the width direction is perpendicular to the plane where the curve is located; and / or, An edge of the first sealing layer close to the other end of the first curved plate along the extending direction of the curve is welded to an edge of the second sealing layer.

3. The battery case according to claim 2, characterized in that: A first connecting plate is provided at the other end of the first curved plate along the direction in which the curve extends, and a second connecting plate is provided at the other end of the second curved plate along the direction in which the curve extends, and the first connecting plate and the second connecting plate are arranged opposite to each other; The first sealing layer includes a first welding portion located on the first connecting plate toward the second connecting plate, and the second sealing layer includes a second welding portion located on the second connecting plate toward the first connecting plate, and the first welding portion is welded to the second welding portion.

4. The battery case according to claim 3, characterized in that: A through hole is formed between the first connecting plate and the second connecting plate. The through hole is communicated with the accommodating space and is used for allowing the tab of the battery cell to pass through.

5. The battery case according to claim 2, characterized in that: The first curved plate is provided with a third connecting plate at both ends along the width direction, and the second curved plate is provided with a fourth connecting plate at both ends along the width direction, and the two third connecting plates and the two fourth connecting plates are arranged in a one-to-one correspondence with each other. The first sealing layer includes a third welding portion located on the third connecting plate toward the fourth connecting plate, and the second sealing layer includes a fourth welding portion located on the fourth connecting plate toward the third connecting plate, and the third welding portion is welded to the fourth welding portion.

6. The battery case according to claim 5, characterized in that: The third connecting plate is substantially perpendicular to the width direction.

7. The battery case according to claim 1, characterized in that: One end of the first curved plate along the width direction of the battery housing is integrally connected to the second curved plate, and the width direction is perpendicular to the plane where the curve is located; The edges of the first sealing layer on both sides along the extending direction of the curve are welded to the edge of the second sealing layer; and / or, An edge of the first sealing layer close to the other end of the first curved plate along the width direction is welded to an edge of the second sealing layer.

8. The battery case according to any one of claims 1 to 7, characterized in that: The material of the first sealing layer and / or the second sealing layer includes resin.

9. The battery case according to any one of claims 1 to 7, characterized in that: The first side plate comprises a first supporting layer and a first insulating layer stacked in a direction away from the first sealing layer, and the material of the first supporting layer comprises metal; and / or, The second side plate includes a second supporting layer and a second insulating layer stacked in a direction away from the second sealing layer, and the material of the second supporting layer includes metal.

10. A battery, characterized in that: include: A battery housing, wherein the battery housing is the battery housing according to any one of claims 1 to 9; The battery cell is arranged in the accommodation space of the battery casing.

11. A method for preparing a battery, characterized in that: The method comprises: A housing substrate is provided, the housing substrate comprising a first side plate and a second side plate, the first side plate comprising a first curved plate; the second side plate comprising a second curved plate, a first sealing layer being provided on one side of the first side plate, and a second sealing layer being provided on one side of the second side plate; The first side plate and the second side plate are arranged opposite to each other, so that the concave surface of the second curved plate is spaced opposite to the convex surface of the first curved plate, so that the first sealing layer is located on the side of the first side plate facing the second side plate, the second sealing layer is located on the side of the second side plate facing the first side plate, and a receiving space extending along the curve is formed between the first curved plate and the second curved plate; The battery cell is placed in the accommodation space, and at least one side edge of the first sealing layer and the edge of the second sealing layer are welded to form a battery extending along the curve.

12. The method for preparing a battery according to claim 11, characterized in that: The housing substrate is an integrated structure; the first side plate and the second side plate are arranged opposite to each other, including: The connection between the first side plate and the second side plate is bent so that the first side plate and the second side plate are arranged opposite to each other.

13. The method for preparing a battery according to claim 11, characterized in that: One end of the first curved plate along the direction in which the curve extends is integrally connected to the second curved plate; the tab of the battery cell is close to the other end of the first curved plate along the direction in which the curve extends; the battery cell is placed in the accommodation space, and at least one side edge of the first sealing layer and the edge of the second sealing layer are welded to form a battery extending along the curve, comprising: Placing a battery cell in the accommodation space, wherein the battery cell extends along the curve; Welding the edge of the first sealing layer close to the other end of the first curved plate along the extending direction of the curve to the edge of the second sealing layer; Welding one side edge of the first sealing layer along the width direction of the battery housing to the edge of the second sealing layer, wherein the width direction is perpendicular to the plane where the curve is located; Injecting electrolyte into the accommodation space from a gap between the second sealing layer and the other side edge of the first sealing layer along the width direction; The other side edge of the first sealing layer along the width direction of the battery case is welded to the edge of the second sealing layer.

14. The method for preparing a battery according to claim 13, characterized in that: The first curved plate is provided with a third connecting plate at both ends along the width direction, and the second curved plate is provided with a fourth connecting plate at both ends along the width direction, and the third connecting plate and the fourth connecting plate are arranged opposite to each other; the side edge of the first sealing layer along the width direction of the battery housing is welded to the edge of the second sealing layer, including: Clamp the heating end cap on surfaces of one of the third connecting plates and the corresponding fourth connecting plate that are away from each other; wherein the heating end cap extends along the curve; The heating head is used to heat the first sealing layer and the second sealing layer between the third connecting plate and the corresponding fourth connecting plate to weld one side edge of the first sealing layer along the width direction of the battery casing to the edge of the second sealing layer.

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