Battery shell and battery

Abstract

The utility model provides a battery shell and a battery, 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 and 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 the 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 technical field of batteries, in particular to a battery shell, a battery and a battery preparation method. BACKGROUND

[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 electronic products with curved shapes, a curved battery with a certain curvature needs to be used for cooperation. In the related art, after the battery cell is installed into the battery shell, the battery as a whole is bent to form a curved battery with a certain curvature. However, this may easily cause the tab inside the battery to produce powder dropping, puncture the separator and other problems, thereby affecting the reliability of the battery. CONTENT OF THE UTILITY MODEL

[0003] Embodiments of the present application provide a battery shell, a battery and a battery preparation method, which can improve the technical problem of affecting the reliability of the battery after bending in the related art.

[0004] In a first aspect, embodiments of the present application provide a battery shell extending along a curve, comprising:

[0005] a first side plate comprising a first curved surface plate;

[0006] a second side plate comprising a second curved surface plate, wherein the concave curved surface of the second curved surface plate is oppositely spaced from the convex curved surface of the first curved surface plate, and forms an accommodating space extending along the curve, and the accommodating space is used for accommodating a battery cell;

[0007] wherein one side of the first side plate facing the second side plate is provided with a first sealing layer, one side of the second side plate facing the first side plate is provided with a second sealing layer, and at least one side edge of the first sealing layer and the edge of the second sealing layer are fused.

[0008] In an embodiment, one end of the first curved surface plate along the extension direction of the curve is integrally connected with the second curved surface plate;

[0009] two side edges of the first sealing layer along the width direction of the battery shell are fused with the edge of the second sealing layer, and the width direction is perpendicular to the plane where the curve is located; and / or,

[0010] one side edge of the first sealing layer close to the first curved surface plate along the other end of the curve in the extension direction is fused with the edge of the second sealing layer.

[0011] In an embodiment, the first curved surface plate is provided with a first connecting plate at the other end along the extension direction of the curve, the second curved surface plate is provided with a second connecting plate at the other end along the extension direction of the curve, and the first connecting plate and the second connecting plate are oppositely arranged.

[0012] The first sealing layer comprises a first fusion portion located on the first connecting plate towards the second connecting plate, the second sealing layer comprises a second fusion portion located on the second connecting plate towards the first connecting plate, and the first fusion portion is fused with the second fusion portion.

[0013] In an embodiment, a through hole is enclosed between the first connecting plate and the second connecting plate, the through hole is in communication with the accommodation space, and the through hole is used for passing the tab of the battery cell.

[0014] In an embodiment, the first curved plate is respectively provided with a third connecting plate at both ends along the width direction, the second curved plate is respectively 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 oppositely arranged one by one.

[0015] The first sealing layer comprises a third fusion portion located on the third connecting plate towards the fourth connecting plate, the second sealing layer comprises a fourth fusion portion located on the fourth connecting plate towards the third connecting plate, and the third fusion portion is fused with the fourth fusion portion.

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

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

[0018] The two side edges of the first sealing layer along the extension direction of the curve are fused with the edges of the second sealing layer; and / or,

[0019] The side edge of the first sealing layer close to the other end of the first curved plate along the width direction is fused with the edge of the second sealing layer.

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

[0021] In an embodiment, the first side plate comprises a first support layer and a first insulation layer which are stacked in a direction away from the first sealing layer, and the material of the first support layer comprises metal; and / or,

[0022] The second side plate comprises a second support layer and a second insulation layer which are stacked in a direction away from the second sealing layer, and the material of the second support layer comprises metal.

[0023] In a second aspect, embodiments of the present application provide a battery, comprising:

[0024] The battery shell is a battery shell as described above, the battery shell extends along a curve, the battery shell 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 curve of the second curved plate is oppositely spaced from the convex curve of the first curved plate, and forms an accommodation space extending along the curve, the accommodation space is used for accommodating the battery cell; wherein one side of the first side plate towards the second side plate is provided with a first sealing layer, one side of the second side plate towards the first side plate is provided with a second sealing layer, and at least one side edge of the first sealing layer and an edge of the second sealing layer are fused;

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

[0026] The beneficial effects of the embodiments of the present application are as follows:

[0027] In the embodiments of the present application, the convex curve of the first curved plate of the first side plate of the battery shell is oppositely spaced from the concave curve of the second curved plate of the second side plate, so as to form an accommodation space extending along a curve and used for accommodating the battery cell, and at least one side edge of the first sealing layer on one side of the first side plate towards the second side plate is fused with the edge of the second sealing layer on one side of the second side plate towards the first side plate. Therefore, the first side plate and the second side plate structure of the battery shell can be processed first, and after the battery cell is installed in the accommodation 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 fused to seal the battery shell, so as to realize the packaging of the battery shell and the battery cell to form a battery. In this process, the battery as a whole does not need to be bent, so that the problems such as wrinkles of the battery shell, falling of the pole piece of the battery cell, and piercing of the diaphragm after the packaging of the battery is completed can be avoided, and the stability of the battery is improved. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0029] Figure 1 is a structural schematic diagram of one embodiment of the battery provided by the embodiments of the present application;

[0030] Figure 2 is Figure 1 is a sectional view of the battery in the embodiment, wherein the sectioning surface is perpendicular to the width direction of the battery shell;

[0031] Figure 3 is Figure 2An enlarged view of the middle A;

[0032] Figure 4 is Figure 1 A sectional view of the battery, wherein the sectioning surface is parallel to the width direction of the battery;

[0033] Figure 5 is Figure 4 An enlarged view of the middle B;

[0034] Figure 6 is a sectional view of the first side plate provided by the embodiment of the present application;

[0035] Figure 7 is a flow chart of one embodiment of the battery preparation method provided by the embodiment of the present application.

[0036] Battery 100; battery shell 110; accommodating space 1100; through hole 1101; first side plate 111; first curved plate 1111; first sealing layer 1112; first fusion 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 fusion portion 1123; second connecting plate 1124; fourth connecting plate 1125; battery cell 120; tab 121; curve L. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person skilled in the art without creative work fall within the protection scope of the present application. In addition, it should be understood that the specific implementation manners described herein are only used for illustrating and explaining the present application, and are not used for limiting the present application. In the present application, the positional words such as “upper” and “lower” generally refer to the upper and lower in the actual use or working state of the device, and specifically refer to the drawing plane direction in the drawings; and “inner” and “outer” refer to the contour of the device.

[0038] The embodiments of the present application provide a battery shell, a battery and a battery preparation method.

[0039] Figure 1 is a structural schematic view of one embodiment of the battery provided by the embodiment of the present application. Figure 2 is Figure 1 A sectional view of the battery, wherein the sectioning surface is perpendicular to the width direction of the battery shell. As Figure 1 and Figure 2As shown, the battery 100 includes a battery housing 110 and a battery cell 120, the battery housing 110 includes an accommodating space 1100, and the battery cell 120 is arranged in the accommodating space 1100 of the battery housing 110. Wherein, 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 or other devices that need a curved battery 100.

[0040] As shown in Figure 1 and Figure 2 , the battery housing 110 of the battery 100 extends along a curve L. The battery housing 110 can 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 plate surface of the first curved plate 1111 is a convex curved surface, and the other side plate surface is a concave curved surface. The second side plate 112 includes a second curved plate 1121, one side plate surface of the second curved plate 1121 is a convex curved surface, and the other side plate surface is a concave curved surface. The concave curved surface of the second curved plate 1121 is oppositely spaced from the convex curved surface of the first curved plate 1111, and forms an accommodating space 1100 extending along the curve L, and the accommodating space 1100 is used to accommodate the battery cell 120.

[0041] It should be noted that the curve L can be an arc line with fixed curvature, or a curve L with unfixed curvature, which can be determined according to the product structure to which the battery 100 is applied.

[0042] In some embodiments, the first side plate 111 of the battery housing 110 can be provided with a first sealing layer 1112 on one side facing the second side plate 112, and the second side plate 112 can be provided with a second sealing layer 1122 on one side 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 are fused.

[0043] The battery casing 110 provided in this application embodiment forms a receiving space 1100 extending along curve L and used to receive the battery cell 120 by spacing the convex curved surface of the first curved panel 1111 of the first side plate 111 relative to the concave curved surface of the second curved panel 1121 of the second side plate 112, and by fusing at least one edge of the first sealing layer 1112 on the side of the first side plate 111 toward the side of the second side plate 112 with the edge of the second sealing layer 1122 on the side of the second side plate 112 toward the side of the first side plate 111. Therefore, the first side plate 111 and the second side plate 112 structure of the battery casing 110 can be processed first. After the battery cell 120 is installed in the receiving space 1100 between the first side plate 111 and the second side plate 112, at least one edge of the first sealing layer 1112 and the edge of the second sealing layer 1122 are fused together to seal the battery casing 110. This allows the battery casing 110 and the battery cell 120 to be packaged 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 the wrinkles in the battery casing 110 caused by bending the battery 100 as a whole after it is packaged, as well as the problems of electrode powder shedding and puncture of the separator in the battery cell 120, thereby improving the stability of the battery 100.

[0044] It should be noted that one edge of the first sealing layer 1112 and the edge of the second sealing layer 1122 can be fused together, or two, three, or four edges of the first sealing layer 1112 can be fused together with the edge of the second sealing layer 1122. When one or more edges of the first sealing layer 1112 are not fused with the edge of the second sealing layer 1122, other sealing methods can be used to seal that one or more edges of the battery casing 110.

[0045] In some embodiments, one end of the first curved panel 1111 extending along curve L can be integrally connected to the second curved panel 1121. That is, one end of the first side panel 111 and the second side panel 112 extending along curve L is integrally connected. Therefore, after processing the first side panel 111 and the second side panel 112 to form the first curved panel 1111 and the second curved panel 1121, bending the connection point of the first side panel 111 and the second side panel 112 allows the convex curved surface of the first curved panel 1111 of the first side panel 111 to be relatively spaced from the concave curved surface of the second curved panel 1121 of the second side panel 112. This simplifies the processing steps of the battery casing 110 and improves the connection strength between the first side panel 111 and the second side panel 112. Furthermore, the end of the battery casing 110 integrally connected to the first side panel 111 and the second side panel 112 has high sealing performance.

[0046] Specifically, the first sealing layer 1112 can be fused to the edge of the second sealing layer 1122 along both sides of the battery casing 110 in the width direction, with the width direction perpendicular to the plane containing curve L. This allows for sealing between the two sides of the first side panel 111 and the second side panel 112 along the width direction of the battery casing 110. Alternatively, the edge of the first sealing layer 1112 near the other end of the first curved panel 1111 along the extension direction of curve L can be fused to the edge of the second sealing layer 1122, thereby sealing the first side panel 111 and the second side panel 112.

[0047] It should be noted that the first sealing layer 1112 can be fused to the edge of the second sealing layer 1122 simultaneously along both sides of the battery housing 110 in the width direction, and the edge of the first sealing layer 1112 near the other end of the first curved panel 1111 along the curve L in the extension direction can be fused to the edge of the second sealing layer 1122. Alternatively, only the edges of the first sealing layer 1112 along both sides of the battery housing 110 in the width direction can be fused to the edge of the second sealing layer 1122, or only the edge of the first sealing layer 1112 near the other end of the first curved panel 1111 along the curve L in the extension direction can be fused to the edge of the second sealing layer 1122. Of course, the former can further improve the sealing effect on each side edge of the battery housing 110 and make sealing each side of the battery housing 110 simpler and more convenient.

[0048] In some embodiments, such as Figure 2 and Figure 3 As shown, a first connecting plate 1114 can be provided at the other end of the first curved panel 1111 along the curve L, and a second connecting plate 1124 can be provided at the other end of the second curved panel 1121 along the curve L. 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 panel 111 and the second connecting plate 1124 of the second side panel 112 are located at the same end of the battery housing 110 along the curve L. When one end of the first curved panel 1111 along the curve L is integrally connected to the second curved panel 1121, that is, when one end of the first side panel 111 and the second side panel 112 are integrally connected along the curve L, the first connecting plate 1114 and the second connecting plate 1124 are located at the end of the battery housing 110 away from the integral connection point of the first curved panel 1111 and the second curved panel 1121.

[0049] The first sealing layer 1112 includes a first fusion portion 1113 located on the first connecting plate 1114 facing the second connecting plate 1124, the second sealing layer 1122 includes a second fusion portion 1123 located on the second connecting plate 1124 facing the first connecting plate 1114, and the first fusion portion 1113 and the second fusion portion 1123 are fused. Thus, the first side plate 111 and the second side plate 112 can be heat-sealed away from one end of the integral connection of the first curved plate 1111 and the second curved plate 1121, which is very convenient to operate.

[0050] The first sealing layer 1112 includes a first fusion portion 1113 located on the first connecting plate 1114 facing the second connecting plate 1124, the second sealing layer 1122 includes a second fusion portion 1123 located on the second connecting plate 1124 facing the first connecting plate 1114, and the first fusion portion 1113 and the second fusion portion 1123 are fused. Thus, the first side plate 111 and the second side plate 112 can be heat-sealed away from one end of the integral connection of the first curved plate 1111 and the second curved plate 1121, which is very convenient to operate.

[0051] Continuing to refer to Figure 2 and Figure 3 The first connecting plate 1114 and the second connecting plate 1124 can be enclosed to form a through hole 1101, which communicates with the accommodation space 1100, and the through hole 1101 is used for the tab 121 of the battery cell 120 to pass through. Thus, when the battery cell 120 is installed in the accommodation space 1100 of the battery shell 110, the tab 121 of the battery cell 120 can pass through the through hole 1101 and extend outside the battery shell 110, so as to facilitate the electrical connection of the tab 121 of the battery cell 120 with the electronic device.

[0052] The first fusion portion 1113 and the second fusion portion 1123 form part of the sealing structure, which is filled between the tab 121 and the inner circumferential surface of the through hole 1101 to seal the gap between the tab 121 and the inner circumferential surface of the through hole 1101. Specifically, the first connecting plate 1114 and the second connecting plate 1124 are enclosed to form two through holes 1101, which are distributed in sequence along the width direction of the battery shell 110, and the two tabs 121 of the battery cell 120 with opposite polarities pass through the two through holes 1101 one by one. The inner circumferential surface of the two through holes 1101 and the corresponding tab 121 are sealed by the sealing structure.

[0053] In other embodiments, a through hole 1101 can be formed between the first connecting plate 1114 and the second connecting plate 1124, and the two tabs 121 of the battery cell 120 with opposite polarities can pass through the through hole 1101, and the two tabs 121 and the inner circumferential surface of the through hole 1101 can be sealed by the sealing structure.

[0054] In some embodiments, as shown in Figure 4 and Figure 5 , the first curved plate 1111 can be provided with a third connecting plate 1115 at each end along the width direction of the battery shell 110, and the second curved plate 1121 can be provided with a fourth connecting plate 1125 at each end along the width direction, and the two third connecting plates 1115 and the two fourth connecting plates 1125 are arranged opposite to each other in a one-to-one correspondence. The third connecting plate 1115 and the fourth connecting plate 1125 arranged in correspondence are located at the same end of the battery shell 110 along the width direction.

[0055] Continuing to refer to Figure 4 and Figure 5 , the first sealing layer 1112 can include a third fusion portion located at the third connecting plate 1115 facing the fourth connecting plate 1125, the second sealing layer 1122 can include a fourth fusion portion located at the fourth connecting plate 1125 facing the third connecting plate 1115, and the third fusion portion and the fourth fusion portion are fused. In this way, the first side plate 111 and the second side plate 112 can be heat-sealed along the two sides of the battery shell 110 in the width direction, which is very convenient to operate.

[0056] In some embodiments, the third connecting plate 1115 and the fourth connecting plate 1125 can be clamped by a heat-sealing clamp head from the surfaces facing away from each other, so that the third fusion portion of the first sealing layer 1112 and the fourth fusion portion 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 that the third fusion portion and the fourth fusion portion are heated, and the third fusion portion and the fourth fusion portion are fused, so that the edges of the first sealing layer 1112 along the two sides of the battery shell 110 in the width direction and the edges of the second sealing layer 1122 are fused.

[0057] In some embodiments, the third connecting plate 1115 can be substantially perpendicular to the width direction. In this way, the overall width of the battery shell 110 in the width direction can be reduced, which is beneficial to reduce the installation space occupied by the battery shell 110. After the third fusion portion and the fourth fusion portion between the third connecting plate 1115 and the fourth connecting plate 1125 are fused, 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 surface of the third connecting plate 1115 is substantially perpendicular to the width direction of the battery shell 110, thereby reducing the overall width of the battery shell 110 without increasing the thickness of the battery shell 110.

[0058] Specifically, the first side plate 111 comprises a connecting side plate 1118 extending from the four peripheral edges of the first curved plate 1111 towards the second curved plate 1121, and the connecting side plate 1118 is connected with the second side plate 112, the first connecting plate 1114 or the third connecting plate 1115 at the end away from the first curved plate 1111. Among them, the connecting side plate 1118 at the end of the first curved plate 1111 along the extension direction of the curve L is integrally connected with the second side plate 112, the connecting side plate 1118 at the other end of the first curved plate 1111 along the extension direction of the curve L is connected with the first connecting plate 1114, and the connecting side plate 1118 at the edges of the first curved plate 1111 along the width direction is connected with two third connecting plates 1115. The first curved plate 1111, the connecting side plate 1118 and the second curved plate 1121 enclose the accommodation space 1100.

[0059] In other embodiments, the first curved plate 1111 of the first side plate 111 can be integrally connected with the second curved plate 1121 at one end along the width direction of the battery shell 110, and the width direction of the battery shell 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 shell 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 connecting part of the first side plate 111 and the second side plate 112 is bent, so that the convex curved surface of the first curved plate 1111 of the first side plate 111 and the concave curved surface of the second curved plate 1121 of the second side plate 112 are spaced apart, which is beneficial to simplify the processing steps of the battery shell 110, and at the same time, improve the connection strength of the first side plate 111 and the second side plate 112. Moreover, the battery shell 110 has higher sealing performance at the end where the first side plate 111 and the second side plate 112 are integrally connected.

[0060] Among them, the two side edges of the first sealing layer 1112 along the extension direction of the curve L are fused with the edges of the second sealing layer 1122, so as to seal the two side edges of the battery shell 110 along the extension direction of the curve L. In addition, the 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 fused with the edge of the second sealing layer 1122, so as to seal the side edge of the battery shell 110 close to the other end of the first curved plate 1111 along the width direction.

[0061] It should be noted that the edges of the first sealing layer 1112 along the extension direction of curve L can be simultaneously fused with the edge of the second sealing layer 1122, and the edge of the first sealing layer 1112 near the other end of the first curved panel 1111 along the width direction can be fused with the edge of the second sealing layer 1122. Alternatively, only the edges of the first sealing layer 1112 along the extension direction of curve L can be fused with the edge of the second sealing layer 1122, or only the edge of the first sealing layer 1112 near the other end of the first curved panel 1111 along the width direction can be fused with the edge of the second sealing layer 1122. Of course, the former can further improve the sealing effect on the edges of the battery casing 110 and make the sealing of the battery casing 110 simpler and more convenient.

[0062] In some embodiments, the material of the first sealing layer 1112 and / or the second sealing layer 1122 may include resin, so that the edges of the first sealing layer 1112 and the second sealing layer 1122 can be more easily fused together, and the sealing effect of the first sealing layer 1112 and the second sealing layer 1122 on the edge of the battery casing 110 after fusion is improved.

[0063] In some embodiments, such as Figure 6 As shown, the first side plate 111 can 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. This allows the first side plate 111 to have higher strength and insulation performance, thereby improving the safety performance of the battery 100.

[0064] Similarly, the second side plate 112 may include a second support layer and a second insulating layer stacked in a direction away from the second sealing layer 1122, wherein the material of the second support layer includes metal, thereby giving the second side plate 112 higher strength and insulation performance, thereby improving the safety performance of the battery 100.

[0065] 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 and negative electrode sheets. The tabs of the battery cell 120 include a positive tab and a negative tab, with the positive tab electrically connected to the positive electrode sheet and the negative tab electrically connected to the negative electrode sheet. Protective adhesive paper can also be wrapped around the outer periphery of the core to protect it. Tail adhesive paper can also be provided at the winding end of the core to prevent it from unraveling.

[0066] This application also provides a battery, which includes a battery casing. The specific structure of the battery casing is as described in the above embodiments. Since this battery adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0067] The battery 100 can include a battery shell 110 and a battery cell 120. The structure of the battery shell 110 can refer to the above embodiments. The battery cell 120 is arranged in the accommodating space 1100 of the battery shell 110. The structure and connection mode of the battery cell 120 and the battery shell 110 can refer to the embodiments of the present application, which will not be repeated here.

[0068] In order to better prepare the battery shell 110 provided in the embodiments of the present application, the present application further provides a battery preparation method. As shown in the following Figure 7 The battery preparation method can include steps S210 to S230, which are described in detail as follows.

[0069] S210, providing a shell substrate, the shell substrate including a first side plate 111 and a second side plate 112, the first side plate 111 including a first curved plate 1111; the second side plate 112 including a second curved plate 1121, one side of the first side plate 111 is provided with a first sealing layer 1112, and one side of the second side plate 112 is provided with a second sealing layer 1122.

[0070] The structure and material of the first curved plate 1111, the second curved plate 1121, the first sealing layer 1112 and the second sealing layer 1122 can refer to the above embodiments.

[0071] S220, oppositely arranging the first side plate 111 and the second side plate 112, so that the concave curved surface of the second curved plate 1121 and the convex curved surface of the first curved plate 1111 are oppositely spaced, so that the first sealing layer 1112 is located on one side of the first side plate 111 facing the second side plate 112, the second sealing layer 1122 is located on one side of the second side plate 112 facing the first side plate 111, and the first curved plate 1111 and the second curved plate 1121 form an accommodating space 1100 extending along the curve L.

[0072] S230, 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 a battery 100 extending along the curve L.

[0073] The battery preparation method provided by the embodiments of the present application can be used to arrange the first side plate 111 with the first curved plate 1111 opposite to the second side plate 112 with the second curved plate 1121, so that the concave curved surface of the second curved plate 1121 is opposite to the convex curved surface of the first curved plate 1111, the accommodation space 1100 extending along the curve L is formed between the first curved plate 1111 and the second curved plate 1121, the first sealing layer 1112 is located on the side of the first side plate 111 facing the second side plate 112, the second sealing layer 1122 is located on the side of the second side plate 112 facing the first side plate 111, and after the battery cell 120 is placed in the accommodation space 1100, the at least one side edge of the first sealing layer 1112 and the edge of the second sealing layer 1122 are fused, so that the battery shell 110 is sealed, thereby realizing the packaging of the battery shell 110 and the battery cell 120 to form the battery 100. In this process, the battery 100 as a whole does not need to be bent, so that the problems such as the folding of the battery shell 110, the falling of the pole piece of the battery cell 120, the piercing of the diaphragm and the like after the packaging of the battery 100 is completed can be avoided, and the stability of the battery 100 is improved.

[0074] In some embodiments, the shell substrate can be an integrated structure. The above step of arranging the first side plate 111 opposite to the second side plate 112 can include bending the connection of the first side plate 111 and the second side plate 112 to arrange the first side plate 111 opposite to the second side plate 112. 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 of the first side plate 111 and the second side plate 112 is bent, so that the convex curved surface of the first curved plate 1111 of the first side plate 111 is opposite to the concave curved surface of the second curved plate 1121 of the second side plate 112, which is beneficial to simplify the processing steps of the battery shell 110, and at the same time, improve the connection strength of the first side plate 111 and the second side plate 112. Moreover, the battery shell 110 has high sealing performance at the end where the first side plate 111 and the second side plate 112 are integrally connected.

[0075] In the above embodiment, the side edge of the first side plate 111 and the side edge of the second side plate 112 can be integrally connected. Specifically, the side edge of the first side plate 111 in the length direction and the side edge of the second side plate 112 in the length direction can be integrally connected, or the side edge of the first side plate 111 in the width direction and the side edge of the second side plate 112 in the width direction can be integrally connected.

[0076] In some embodiments, the first curved panel 1111 can be integrally connected with the second curved panel 1121 at one end along the extension direction of the curve L. The tab 121 of the battery cell 120 is close to the other end of the first curved panel 1111 along the extension direction of the curve L. Wherein, the above steps of 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 the battery 100 extending along the curve L can include steps S231 to S235, which are described in detail as follows:

[0077] S231, place the battery cell 120 in the accommodation space 1100, and the battery cell 120 extends along the curve L.

[0078] Wherein, the battery cell 120 can be installed into the accommodation space 1100 from the opening of the side of the battery shell 110 which is not heat-sealed. The battery cell 120 can be bent in advance to form a curved battery cell 120 extending along the curve L. For example, the battery cell 120 can be installed into the accommodation space 1100 from the opening of the side of the battery shell 110 in the width direction, or the battery cell 120 can be installed into the accommodation space 1100 from the opening of the side of the battery shell 110 along the extension direction of the curve L.

[0079] S232, weld the edge of the second sealing layer 1122 to the side edge of the first sealing layer 1112 close to the other end of the first curved panel 1111 along the extension direction of the curve L.

[0080] By welding the edge of the second sealing layer 1122 to the side edge of the first sealing layer 1112 close to the other end of the first curved panel 1111 along the extension direction of the curve L, the end of the battery shell 110 away from the integral connection of the first side plate 111 and the second side plate 112 can be sealed.

[0081] S233, weld the edge of the second sealing layer 1122 to the side edge of the first sealing layer 1112 along the width direction of the battery shell 110, and the width direction is perpendicular to the plane where the curve L is located.

[0082] By welding the edge of the second sealing layer 1122 to the side edge of the first sealing layer 1112 along the width direction of the battery shell 110, the side edge of the battery shell 110 along the width direction can be sealed, and at this time, the other side edge of the battery shell 110 along the width direction forms an opening communicating with the accommodation space 1100.

[0083] S234, inject electrolyte into the accommodation space 1100 from the gap between the other side edge of the first sealing layer 1112 along the width direction and the second sealing layer 1122.

[0084] Before the electrolyte is injected into the accommodation space 1100, the battery case 110 and the battery cell 120 can also be baked to remove excess moisture in the accommodation space 1100. In addition, after the electrolyte injection is performed, the battery case 110 can also be placed in a vacuum environment to facilitate heat sealing of the battery case 110.

[0085] S235, melt the first sealing layer 1112 along the other side edge of the battery case 110 in the width direction to the edge of the second sealing layer 1122.

[0086] By melting the first sealing layer 1112 along the other side edge of the battery case 110 in the width direction to the edge of the second sealing layer 1122, the four peripheral edges of the battery case 110 can be sealed, and the battery case 110 and the battery cell 120 are packaged to form the battery 100 extending along the curve L.

[0087] In some embodiments, the first curved panel 1111 can be provided with a third connecting plate 1115 at each end in the width direction, and the second curved panel 1121 can be provided with a fourth connecting plate 1125 at each end in the width direction, and the third connecting plate 1115 and the fourth connecting plate 1125 are oppositely arranged. The step of melting the first sealing layer 1112 along one side edge of the battery case 110 in the width direction to the edge of the second sealing layer 1122 can include:

[0088] S2331, clamping the heating sealing head on the surface of one of the third connecting plate 1115 and the corresponding fourth connecting plate 1125 facing away from each other; wherein the heating sealing head extends along the curve L.

[0089] S2332, heating the part of the first sealing layer 1112 and the second sealing layer 1122 between the third connecting plate 1115 and the corresponding fourth connecting plate 1125 by the heating sealing head to melt the first sealing layer 1112 along one side edge of the battery case 110 in the width direction to the edge of the second sealing layer 1122.

[0090] Since the heating sealing head also extends along the curve L, when the heating sealing head is clamped on the surface of one of the third connecting plate 1115 and the corresponding fourth connecting plate 1125 facing away from each other, the shape of the heating sealing head is adapted to the shape of the first connecting plate 1114 and the second connecting plate 1124, which can avoid the problem that the first side plate 111 and the second side plate 112 are deformed after the heating sealing head is clamped on the surface of one of the third connecting plate 1115 and the corresponding fourth connecting plate 1125 facing away from each other, and is conducive to improving the structural stability of the battery case 110 during heat sealing.

[0091] The above has carried out the detailed introduction to the embodiment of the application, the principle and implementation mode of the application have been described by applying specific examples in this paper, the above embodiment explanation is only for helping understanding the method of the application and its core idea; at the same time, for the person skilled in the art, according to the idea of the application, there will be changes in specific implementation mode and application range, and the above-mentioned, the content of the specification should not be understood as the limitation of the application.

Claims

1. A battery housing extending along a curve, characterized in that The first side plate comprises a first curved plate; The second side plate comprises a second curved plate, the concave curve of the second curved plate is oppositely spaced from the convex curve of the first curved plate, and forms an accommodation space extending along the curve, the accommodation space being used for accommodating an electric core; Wherein, one side of the first side plate towards the second side plate is provided with a first sealing layer, one side of the second side plate towards the first side plate is provided with a second sealing layer, and at least one side edge of the first sealing layer and the edge of the second sealing layer are fused. One end of the first curved plate along the extension direction of the curve is integrally connected with the second curved plate; 2. The battery case of claim 1, wherein, The two side edges of the first sealing layer along the width direction of the battery shell are fused with the edges of the second sealing layer, and the width direction is perpendicular to the plane where the curve is located; and / or, The side edge of the first sealing layer close to the other end of the first curved plate along the extension direction of the curve is fused with the edge of the second sealing layer. The other end of the first curved plate along the extension direction of the curve is provided with a first connecting plate, and the other end of the second curved plate along the extension direction of the curve is provided with a second connecting plate, the first connecting plate and the second connecting plate are oppositely arranged; 3. The battery case of claim 2, wherein, The first sealing layer comprises a first fusion part located towards the second connecting plate of the first connecting plate, and the second sealing layer comprises a second fusion part located towards the first connecting plate of the second connecting plate, the first fusion part is fused with the second fusion part. A through hole is enclosed between the first connecting plate and the second connecting plate, the through hole is communicated with the accommodation space, and the through hole is used for passing through the tab of the electric core.

4. The battery case of claim 3, wherein The two ends of the first curved plate along the width direction are respectively provided with a third connecting plate, and the two ends of the second curved plate along the width direction are respectively provided with a fourth connecting plate, the two third connecting plates and the two fourth connecting plates are oppositely arranged one by one; 5. The battery case of claim 2, wherein The first sealing layer comprises a third fusion part located towards the fourth connecting plate of the third connecting plate, and the second sealing layer comprises a fourth fusion part located towards the third connecting plate of the fourth connecting plate, the third fusion part is fused with the fourth fusion part. The third connecting plate is substantially perpendicular to the width direction.

6. The battery case of claim 5, wherein, One end of the first curved plate along the width direction of the battery shell is integrally connected with the second curved plate, and the width direction is perpendicular to the plane where the curve is located; 7. The battery case of claim 1, wherein The two side edges of the first sealing layer along the extension direction of the curve are fused with the edges of the second sealing layer; and / or, The side edge of the first sealing layer close to the other end of the first curved plate along the width direction is fused with the edge of the second sealing layer. The material of the first sealing layer and / or the second sealing layer comprises resin.

8. The battery case according to any one of claims 1 to 7, wherein The first side plate comprises a first support layer and a first insulation layer which are stacked in a direction away from the first sealing layer, and the material of the first support layer comprises metal; and / or, 9. The battery case according to any one of claims 1 to 7, wherein The second side plate comprises a second support layer and a second insulation layer which are stacked in a direction away from the second sealing layer, and the material of the second support layer comprises metal. The first side plate comprises a first curved plate; 10. A battery, characterized by ​ A battery case according to any one of claims 1 to 9; An electrode group is provided in the accommodation space of the battery case.

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