Battery holder and battery

Abstract

A battery case (10) and a battery (100), wherein the battery case (10) comprises a case body (11), a storage space (111) defined within the case body (11), and two open ends provided on the case body (11), each of the open ends communicating with the storage space (111), a lower cover (12), the lower cover (12) being connected to one end of the case body (11) to close one of the open ends, and an upper cover (13), the upper cover (13) being connected to the other end of the case body (11) to close the other open end, and the lower cover (12) and / or the upper cover (13) being a plate-like member, and a side wall of the case body (11) being perpendicular to the plate-like member.

Description

[Technical field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This disclosure is based on and claims priority to Chinese Patent Application No. 202220774022.3, filed on April 1, 2022, the disclosure of which is incorporated herein by reference in its entirety.

[0002] The present disclosure relates to the technical field of batteries, and in particular to a battery casing and a battery having a battery casing. [Background technology]

[0003] The battery case of the related art includes a case body and a cover, and the case body includes a bottom plate and a side plate. The battery case body is usually integrally formed by a stamping process. Due to the limitation caused by the stress concentration in the process, in the process of making the case body, a transition surface is inevitably formed between the bottom plate and the side plate, and therefore the space corresponding to the transition surface cannot be fully utilized, which reduces the energy density of the battery. Summary of the Invention [Problem to be solved by the invention]

[0004] The present disclosure aims to solve at least to some extent one of the technical problems of the related art.

[0005] To achieve this, an objective of the present disclosure is to provide a battery case to solve the problems in the related art of low space utilization and low energy density of the battery due to the presence of transition surfaces.

[0006] Another object of the present disclosure is to provide a battery having the above battery case. [Means for solving the problem]

[0007] According to a first aspect of the present disclosure, a battery case is provided, the battery case comprising: a case body, the case body defining an accommodation space therein, the case body having two open ends, each open end communicating with the accommodation space; a lower cover, the lower cover being connected to one end of the case body and configured to close one open end; an upper cover, the upper cover being connected to the other end of the case body and configured to close the other open end; Includes.

[0008] The lower cover and / or the upper cover are plate-like members, and the side walls of the case body are perpendicular to the plate-like members.

[0009] In the battery case according to the present disclosure, by directly connecting the case body to the upper cover and the lower cover, a connection via a transition surface between the case body and the upper cover or between the case body and the lower cover is avoided, thus reducing the effect of the transition surface on the battery dimensions and improving the energy density of the battery.

[0010] According to a second aspect of the present disclosure, there is provided a battery including a battery case, the battery case being as described above.

[0011] Additional aspects and advantages of the disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the disclosure. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is an exploded view of a battery provided in the related art. [Diagram 2] FIG. 2 is a schematic three-dimensional structural diagram of a battery case according to one embodiment of the present disclosure. [Diagram 3] FIG. 13 is a schematic three-dimensional structural diagram of a battery case according to another embodiment of the present disclosure. [Figure 4]FIG. 2 is a side view of a battery case according to one embodiment of the present disclosure. [Diagram 5] FIG. 2 is a top view of a battery case according to one embodiment of the present disclosure. [Figure 6] FIG. 2 is a cross-sectional view of a battery case before welding according to one embodiment of the present disclosure. [Figure 7] FIG. 7 is an enlarged view of the enclosed area C in FIG. [Figure 8] FIG. 7 is an enlarged view of the enclosed area D in FIG. [Figure 9] FIG. 2 is a cross-sectional view of a battery case after welding according to one embodiment of the present disclosure. [Figure 10] FIG. 10 is an enlarged view of the enclosed area E in FIG. [Figure 11] FIG. 10 is an enlarged view of the enclosed area F in FIG. [Figure 12] FIG. 13 is an exploded view of a battery case from one perspective according to another embodiment of the present disclosure. [Figure 13] FIG. 13 is an exploded view of a battery case from another perspective according to another embodiment of the present disclosure. [Figure 14] FIG. 11 is a cross-sectional view showing an exploded structure of a battery case according to another embodiment of the present disclosure. [Figure 15] FIG. 13 is a cross-sectional view of a battery case before welding according to another embodiment of the present disclosure. [Figure 16] FIG. 16 is an enlarged view of the enclosed area G in FIG. [Figure 17] FIG. 13 is a cross-sectional view of a battery case after welding according to another embodiment of the present disclosure. [Figure 18] FIG. 18 is an enlarged view of the enclosed area H in FIG. [Figure 19] FIG. 2 is a cross-sectional view of a battery along direction AA according to one embodiment of the present disclosure. [Figure 20] FIG. 2 is a cross-sectional view of a battery along direction BB according to one embodiment of the present disclosure. [Figure 21] FIG. 2 is a top view of an electrode core of a battery according to one embodiment of the present disclosure. [Figure 22]FIG. 13 is a schematic diagram of the assembly of a battery case assembled with a rivet, a second insulating sheet, a first insulating sheet, and a metal sheet from one perspective according to an embodiment of the present disclosure. [Figure 23] FIG. 13 is a schematic diagram of the assembly of a battery case assembled with a rivet, a second insulating sheet, a first insulating sheet, and a metal sheet, viewed from another perspective, according to an embodiment of the present disclosure. [Figure 24] FIG. 2 is a cross-sectional view illustrating a battery case assembled with a rivet, a second insulating sheet, a first insulating sheet, and a metal sheet according to one embodiment of the present disclosure. [Diagram 25] FIG. 25 is an enlarged view of the enclosed area I in FIG. 24. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically specified, the relative arrangements, formulas, and numerical values ​​of components and steps described in the embodiments do not limit the scope of the present disclosure.

[0014] The following description of at least one exemplary embodiment is merely illustrative and is not intended to constitute any limitation on the present disclosure and application, or their use in any manner.

[0015] Techniques, methods and devices known to those skilled in the relevant art need not be discussed in detail, but, where appropriate, the techniques, methods and devices should be considered part of this specification.

[0016] In all examples shown and discussed herein, any specific values ​​should be construed as merely exemplary and not limiting, and thus other examples of example embodiments may have different values.

[0017] It should be noted that in the following drawings, like reference numbers and letters refer to like items, so once an item is defined in a drawing, it need not be discussed further in the following drawings.

[0018] The present disclosure is an invention made by the present inventor based on the following facts.

[0019] FIG. 1 shows a battery case of the related art.

[0020] 1, the battery case includes a case body and a cover 4. The case body includes a bottom plate 1 and a side plate 2, and the bottom plate 1 and the side plate 2 are connected via an arc-shaped transition surface 3.

[0021] The above battery case has the following defects: the case body is integrally formed by punching to avoid stress concentration in the process, so that the arc-shaped transition surface 3 is inevitable in the processing process, and this part of the space cannot be fully utilized, which reduces the energy density of the battery.

[0022] Based on this, after long-term research and experimentation, the following invention is independently obtained by the present inventors.

[0023] As shown in FIGS. 2 to 25, a battery case 10 according to one embodiment of the present disclosure includes a case body 11, a lower cover 12, and an upper cover 13.

[0024] Specifically, an accommodation space 111 is defined within the case body 11, the case body 11 has two open ends, each of which communicates with the accommodation space 111, the lower cover 12 is connected to one end of the case body 11 and configured to close one of the open ends, and the upper cover 13 is connected to the other end of the case body 11 and configured to close the other open end. The lower cover 12 and / or the upper cover 13 are plate-like members, and the side walls of the case body 11 are perpendicular to the plate-like members.

[0025] In other words, the battery case 10 according to the embodiment of the present disclosure essentially consists of a case body 11, a lower cover 12, and an upper cover 13. The battery case 10 may be made of a metal material such as stainless steel, a nickel alloy, or a chromium alloy. An accommodation space 111 is defined in the case body 11, and an electrode core is accommodated in the accommodation space 111. In this embodiment, the electrode core may be a wound electrode core or a stacked electrode core. The electrode core includes a positive electrode sheet 21, a negative electrode sheet 22, and a separator 23. The lower cover 12 and / or the upper cover 13 are plate-shaped members, and the side walls of the case body 11 are perpendicular to the plate-shaped members. When one open end is closed by the lower cover 12, the lower cover 12 is directly connected to the lower end of the case body 11. That is, the lower cover 12 and the case body 11 are directly connected, and no transition portion is disposed therebetween, and no transition surface exists, which not only improves the external aesthetics of the battery case 10, but also reduces the influence of the transition surface on the dimensions of the electrode core disposed in the receiving space 111, and improves the energy density of the battery 100. Similarly, when the other open end is closed by the upper cover 13, the upper cover 13 is directly connected to the case body 11, and no transition surface is disposed therebetween, which will not be described again here.

[0026] As shown in Fig. 6 and Fig. 12, the case body 11 has two open ends each communicating with the receiving space 111. For ease of explanation, the two open ends may be a first open end and a second open end. The first open end is closed by the lower cover 12, and the second open end is closed by the upper cover 13. Optionally, the lower cover 12 is disposed on the opposite side to the upper cover 13, the receiving space 111 is a straight mounting channel, the first open end may be located above the mounting channel in the axial direction, and the second open end may be located below the installation channel in the axial direction.

[0027] When the first open end is closed by the lower cover 12, the lower cover 12 is directly connected to the lower end of the case body 11. That is, the lower cover 12 and the case body 11 are directly connected, and no transition portion is disposed between them, and no transition surface exists, which not only improves the external aesthetics of the battery case 10, but also reduces the influence of the transition surface on the dimensions of the electrode core disposed in the receiving space 111, and improves the energy density of the battery 100. Similarly, when the second open end is closed by the upper cover 13, the upper cover 13 is directly connected to the case body 11, and no transition surface is disposed between them, which will not be described again here.

[0028] As shown in FIG. 4 and FIG. 6, the lower cover 12 and / or the upper cover 13 are plate-shaped members, and the side walls of the case body 11 are perpendicular to the plate-shaped members. That is, at least one of the lower cover 12 and the upper cover 13 is a plate-shaped member, and the extending direction of the plate-shaped member is perpendicular to the side walls of the case body 11. For example, the plate-shaped member extends in the horizontal direction, and the case body 11 extends in the vertical direction. The thickness of the plate-shaped member may be set to a uniform thickness. In this case, the included angle between the outer surface of the plate-shaped member and the outer surface of the case body 11 may be 90°, and the included angle between the inner surface of the plate-shaped member and the outer surface of the case body 11 may also be 90°. When the thickness of the case body 11 is also uniform, each surface of the plate-shaped member is perpendicular to the inner and outer surfaces of the case body 11.

[0029] In some specific embodiments of the present disclosure, the case body 11 is welded to the top cover 13 and / or the bottom cover 12. That is, the case body 11 may be welded to at least one of the top cover 13 and the bottom cover 12. During a specific welding process, by image registration using a CCD camera, the top cover 13 or the bottom cover 12 is overlapped with the case body 11 and fastened by a fastener, and then the battery case 10 is sealed by laser welding.

[0030] In this embodiment, by welding the case body 11 to the upper cover 13, no transition surface is formed between the case body 11 and the upper cover 13, and a direct connection between the case body 11 and the upper cover 13 is realized. Similarly, by welding the case body 11 to the lower cover 12, a direct connection between the case body 11 and the lower cover 12 can also be realized, which will not be described again here.

[0031] Compared with the related art, in order to avoid the formation of transition surfaces, such as arc-shaped transition surfaces, between the upper cover 13 and the case body 11 and between the lower cover 12 and the case body 11, in the present disclosure, the upper cover 13 is directly connected to the case body 11, and the lower cover 12 is directly connected to the case body 11. Due to this direct connection structure, the space inside the battery case 10 can be fully used in the present disclosure.

[0032] Therefore, in the battery case 10 according to the embodiment of the present disclosure, by directly connecting the case body 11 to the upper cover 13 and the lower cover 12, a connection via a transition surface between the case body 11 and the upper cover 13 or between the case body 11 and the lower cover 12 is avoided, thus reducing the effect of the transition surfaces on the dimensions of the battery 100 and improving the energy density of the battery 100.

[0033] In some specific embodiments of the present disclosure, as shown in FIGS. 6 to 8, the lower cover 12 and / or the upper cover 13 are plate-like members, and the thickness of the plate-like member is less than the wall thickness of the case body 11. For example, when the lower cover 12 is a plate-like member, the thickness of the lower cover 12 is smaller than the thickness of the case body 11, and when the upper cover 13 is a plate-like member, the thickness of the upper cover 13 is less than the thickness of the case body 11. In this embodiment, by defining the thickness of the plate-like member to be smaller than the wall thickness of the case body 11, the thicknesses of the upper cover 13 and the lower cover 12 may be reduced. In addition, the thickness of the case body 11 is greater than the thicknesses of the upper cover 13 and the lower cover 12. Due to the large wall thickness, when the electrolyte injection hole 112 and the conductive connection region are defined in the case body 11, the positive electrode conductive connector may be conveniently attached or welded. On the other hand, since the area of the weldable region between the upper cover 13 or the lower cover 12 and the case body 11 does not change, this embodiment can not only guarantee the sealing performance between the upper cover 13 or the lower cover 12 and the case body 11, but also further reduce the thickness of the battery and improve the space utilization.

[0034] For ease of explanation, the thickness of the upper cover 13 may be defined as w1, the thickness of the lower cover 12 may be defined as w2, and the thickness of the case body 11 may be defined as w3. When w1 < w3, that is, when the thickness of the upper cover 13 is smaller than the thickness of the case body 11, the area of the connection region between the upper cover 13 and the case body 11 is guaranteed to improve the connection firmness between the case body 11 and the upper cover 13, and the thickness of the upper cover 13 is reduced to improve the space utilization of the battery. For example, in order to reduce the space occupied by the battery case 10 and improve the space utilization of the battery, the thickness of the upper cover 13 and the thickness of the battery 100 may be reduced. Similarly, when w2 < w3, the space utilization of the battery can be improved while the sealing performance between the lower cover 12 and the case body 11 is guaranteed, but this will not be described again here.

[0035] Optionally, 30 μm≦w1≦100 μm, 30 μm≦w2≦100 μm, 100 μm≦w3≦200 μm, by adopting the upper cover 13, the lower cover 12 and the case body 11 having thicknesses in the above numerical ranges, the structural strength is ensured and the reliability of the connection is ensured. The thicknesses of the upper cover 13 and the lower cover 12 may be different or the same, and may be specifically set according to actual needs.

[0036] According to one embodiment of the present disclosure, as shown in FIG. 2-FIG. 3, an accommodation space 111 is defined in the case body 11, the case body 11 has two open ends, each open end communicates with the accommodation space 111, an electrolyte injection hole 112 and a conductive connection area are provided in the case body 11, the lower cover 12 is connected to one end of the case body 11 and configured to close one open end, and the upper cover 13 is connected to the other end of the case body 11 and configured to close the other open end. Of course, the electrolyte injection hole 112 may also be provided in the upper cover 12 or the lower cover 13. In this case, the conductive connection area may be provided in the upper cover 12 or the lower cover 13 together with the electrolyte injection hole 112, or in the case body 11 as desired. This specifically depends on the polarity arrangement of the electrode core body accommodated in the accommodation space 111.

[0037] In the case body 11, the upper cover 12 or the lower cover 13 is provided with an electrolyte injection hole 112 and a conductive connection area. An electrolyte can be injected into the accommodation space 111 through the electrolyte injection hole 112. The conductive connection area may include a positive electrode connection area 117 and a negative electrode connection area 118. The positive electrode connection area 117 may be used for a component provided in the through hole of the case body 11, and the negative electrode connection area 118 may be a partial area of ​​the case body 11. The positive electrode tab of the electrode core may be electrically connected to the positive electrode conductive connector of the positive electrode connection area 117, and the negative electrode tab 24 of the electrode core may be electrically connected to the inner wall surface of the case body 11 corresponding to the negative electrode connection area 118.

[0038] According to one embodiment of the present disclosure, at least a portion of the outer periphery of the open end exceeds the outer periphery of the corresponding lower cover 12 or upper cover 13. For example, the edge of the upper end surface of the second open end exceeds the edge of the upper cover 13. The edge of the lower end surface of the first open end exceeds the edge of the lower cover 12.

[0039] Hereinafter, the upper cover 13 is used as an example for explanation. A part of the upper end surface of the second open end is overlapped on the lower end surface of the upper cover 13, and the width of the overlapping area is defined as h2. Here, it should be noted that the overlapping area means that when the orthographic projection of the upper cover 13 is compared with the orthographic projection of the upper end surface of the second open end in the top-down direction, the overlapping part of the orthographic projection of the upper cover 13 and the orthographic projection of the upper end surface of the second open end is the overlapping area. The corresponding width of the overlapping area refers to the width h2 of the overlapping area in the direction from the inside to the outside. Here, the inside means the direction close to the receiving space 111, and the outside means the direction close to the outside of the battery case 10.

[0040] In addition, when the thickness of the case body 11 is uniform, the thickness of the case body 11 may be defined as w3. At this time, the relationship between the width h2 of the overlapping area and the thickness w3 of the case body 11 may be defined as 1 / 2w3≦h2≦w3. By defining the above numerical range, the strength of the case body 11 supporting the upper cover 13 can be effectively guaranteed. Similarly, a portion of the lower end surface of the first open end is defined to overlap the upper end surface of the lower cover 12, and the width of the corresponding overlapping area may also be defined as h2, and the relationship between the overlapping area and the width of the lower end surface of the first open end is defined to ensure the strength of the case body 11 supporting the lower cover 12, which will not be described again here.

[0041] According to one embodiment of the present disclosure, a notch 14 is formed between the outer periphery of the open end and the outer periphery of the corresponding lower cover 12 or upper cover 13, and the case body 11 is connected to the lower cover 12 or upper cover 13 corresponding to the open end by laser welding, and a portion of the weld joint 113 formed by welding is located in the notch 14.

[0042] For ease of explanation, the upper cover 13 is used as an example for the following explanation. A step is formed between a part of the upper end surface of the second open end and the upper end surface of the upper cover 13. In particular, a part of the upper end surface of the second open end is overlapped with the lower end surface of the upper cover 13, and the outer periphery of the other part of the upper end surface of the second open end exceeds the outer edge of the upper cover 13, and a step is formed between the upper end surface of the second open end and the upper end surface of the upper cover 13, i.e., a notch 14 is formed.

[0043] Optionally, 1 / 2w3≦h2≦3 / 4w3. By adopting a size relationship within this range, it is possible to ensure the reliability of the connection between the upper cover 13 and the lower cover 12 and the case body 11 even when the notch 14 is present.

[0044] When the notch 14 is formed between the upper cover 13 and the second open end, welding may be performed obliquely from above (as shown by the arrow in FIG. 17). The direction of light emission and the intensity of welding may be controlled to form a protrusion of the weld joint 113 at the notch 14. No post-treatment of the protrusion is required, and the overall height or width of the battery case 10 is not increased. The angle between the welding direction and the second open end may be determined according to the size of the notch 14 and the welding strength, and the angle is not limited herein. Similarly, when the notch 14 is formed between the lower cover 12 and the case body 11, welding may be performed at the position of the notch 14 as described above, which will not be described again here.

[0045] In some specific embodiments of the present disclosure, as shown in Figures 7 and 8, the outer periphery of the open end is leveled with the outer periphery of the corresponding lower cover 12 or upper cover 13. The upper cover 13 is used as an example for the following description. The outer periphery of the second open end is leveled with the outer periphery of the upper cover 13, and the width of the overlapping area between the upper end surface of the second open end and the lower end surface of the upper cover 13 is equal to the thickness of the upper end surface of the second open end. When the case body 11 has a structure with a uniform thickness, the width of the overlapping area may be equal to the thickness of the case body 11, i.e. h2=w3.

[0046] According to an embodiment of the present disclosure, as shown in Figs. 10 to 11, the open end is connected to the corresponding lower cover 12 or upper cover 13 by laser welding. The welded joint 113 formed by welding extends to the case body 11 through the lower cover 12 or upper cover 13 corresponding to the open end. The width of the welded joint 113 may be defined as w4. The upper cover 13 is used as an example for the following description. The upper end surface of the second open end is completely overlapped with the lower end surface of the upper cover 13. That is, the lower end surface of the upper cover 13 completely covers the upper end surface of the second open end, and the outer periphery of the upper cover 13 is leveled with the outer periphery of the second open end, that is, h2 = w3. At this time, during the welding process, the welding may be performed along the direction from the upper cover 13 to the case body 11. For example, the upper cover 13 is positioned above the case body 11. When the top cover 13 is welded to the case body 11, the welding may be performed in a vertical top-to-bottom direction, as shown by the arrow in Fig. 9. A weld joint 113 is formed during welding, which can extend through the top cover 13 to the case body 11 and form an airtight connection between the top cover 13 and the case body 11. Similarly, the bottom cover 12 is located below the case body 11, and the bottom cover 12 and the case body 11 may also be fixed by welding in a bottom-to-top direction, which will not be described again here.

[0047] Furthermore, 1 / 3w3≦w4≦1 / 2w3. By adopting the numerical relationship in this range, it is possible to prevent foreign matter generated in the laser welding process from damaging the electrode core body accommodated in the accommodation space 111.

[0048] According to an embodiment of the present disclosure, as shown in FIG. 12 and FIG. 22, the case body 11 has an arc-shaped segment along its circumferential direction, and the outer contour of the lower cover 12 and / or the upper cover 13 is geometrically identical to the outer contour of the case body 11. For example, the outer surface of the case body 11 includes a plurality of side surfaces, and the side surfaces may be straight side wall surfaces 114 or arc-shaped side wall surfaces 115. When the cross-sectional shape of the case body 11 is approximately rectangular, the side walls may include four straight side wall surfaces 114 and four arc-shaped side wall surfaces 115, and one arc-shaped side wall surface 115 is disposed between two adjacent straight side wall surfaces 114. That is, two adjacent straight side wall surfaces 114 may be connected by one arc-shaped side wall surface 115. During production, the case body 11 may be formed by bending a steel plate and welding the ends of the steel plate. Since the steel plate itself has strength, the arc-shaped side wall surfaces 115 are naturally formed during the bending process of the steel plate. That is, when the case body 11 is manufactured by bending, the arc-shaped side wall surface 115 is created. By manufacturing the case body 11 by bending, the difficulty of manufacturing the case body 11 can be reduced.

[0049] In this embodiment, the outer periphery of the case body 11 has an arc-shaped segment, which reduces the difficulty of manufacturing the case body 11. By defining the shape of the outer contour of the upper cover 13 and / or the lower cover 12 to match the outer contour of the case body 11, the aesthetic appearance is improved and material is saved.

[0050] Optionally, the radius of the fillet of the arcuate side wall surface 115 of the case body 11 is defined as R2, where 0.2 mm≦R2. Correspondingly, for assembly, the upper cover 13 and the lower cover 12 may also be provided with fillets having radii R1 and R3, respectively. Meanwhile, in order to further improve the space utilization inside the battery case 10, the positive electrode sheet 21 and / or the negative electrode sheet 22 may also be provided with fillets having a radius R4, where R1, R2, R3, and R4 may be coincident.

[0051] In some specific embodiments of the present disclosure, as shown in FIG. 12, the outer surface of the case body 11 includes a plurality of side surfaces connected in sequence, and the area of ​​the upper cover 13 and the lower cover 12 is greater than the area of ​​each side surface, respectively. It should be noted that in order to improve the sealing performance between the case body 11 and the upper cover 13 or the lower cover 12, the case body 11 needs to have a large thickness so as to increase the area of ​​the connection area, for example, the area of ​​the welding area. If the case body 11 is designed to have a large area structure, the space occupied by the battery case 10 will be increased, which is contrary to the improvement of the energy density of the battery 100. In particular, the side wall of the case body 11 may include a plurality of continuously adjacent side wall members, for example, two first side wall members extending in the length direction and two second side wall members extending in the width direction. The area of ​​the upper cover 13 and the lower cover 12 is greater than the area of ​​each side wall member, respectively. That is, the upper cover 13 and the lower cover 12 each correspond to a larger surface of the electrode core body, and the case body 11 corresponds to a smaller surface of the electrode core body, the area of ​​the larger surface of the electrode core body being larger than the area of ​​the smaller surface of the electrode core body.

[0052] According to an embodiment of the present disclosure, as shown in FIG. 3 and FIG. 12, the upper cover 13 or the lower cover 12 is provided with an explosion-proof score 116. During the charging and discharging process of the battery 100, the electrode core tends to expand in the thickness direction of the battery 100. When the pressure exceeds the upper limit, the battery 100 may explode. Therefore, the thickness of the bottom of the explosion-proof score 116 is smaller than the thickness of other parts, so that when the pressure inside the battery 100 rises, the explosion-proof score 116 will crack and vent the gas, thereby preventing the explosion of the battery 100 and improving the safety of the battery 100. Optionally, the explosion-proof score 116 is disposed on the outer surface of the upper cover 13, and the fillet direction of the explosion-proof score 116 is opposite to the fillet direction of the upper corner of the upper cover 13 closest to the explosion-proof score 116. The explosion-proof notch 116 may be an arc-shaped groove, where the length of the arc may range from 1 / 4 circle to 3 / 4 circle, and the radius of the circle is defined as R5, for example, 3 mm≦R5≦6 mm.

[0053] The present disclosure further discloses a battery 100. The battery 100 includes a battery case 10 and an electrode core, and the battery case 10 is the battery case 10 according to any of the above embodiments. The conductive connection area includes a positive electrode connection area 117 and a negative electrode connection area 118. The positive electrode connection area 117 can be used for components provided in the through-hole of the case body 11, and the negative electrode connection area 118 may be a partial area of ​​the case body 11. The electrode core is disposed in the accommodation space 111, and the electrode core includes a positive electrode tab and a negative electrode tab 24 disposed in the electrode core. The positive electrode tab is electrically connected to the positive electrode connection area 117, and the negative electrode tab 24 is electrically connected to the negative electrode connection area 118. In this embodiment, the electrode core may be made by winding or lamination.

[0054] The negative electrode tab 24 can be directly welded to the inner wall of the case body 11 corresponding to the negative electrode connection region 118. In particular, the negative electrode tab 24 may be collected and then welded to the inner wall corresponding to the negative electrode connection region 118. Thus, the negative electrode tab 24 and the case body 11 are electrically connected.

[0055] Optionally, as shown in FIG. 19, FIG. 20, FIG. 22 to FIG. 25, the positive electrode conductive connector includes a first insulating sheet 33 and a metal sheet 34 disposed on the outside of the battery case 10, and a rivet 31 and a second insulating sheet 32 ​​disposed on the inside of the battery case 10. That is, the rivet 31, the second insulating sheet 32, the case body 11, the first insulating sheet 33, and the metal sheet 34 are disposed in this order from the inside to the outside, and the metal sheet 34, the first insulating sheet 33, and the second insulating sheet 32 ​​are all provided with through holes. The rivet 31 can extend through the second insulating sheet 32, the first insulating sheet 33, the case body 11, and the metal sheet 34 in this order, and finally the rivet 31 is fixed to and electrically connected to the metal sheet 34 by pressing with a force. In addition, the positive electrode tab is collected and then welded to the rivet 31. In the width direction of the battery 100, the width of the first insulating sheet 33 is equal to or greater than the width of the metal sheet 34, and the width of the second insulating sheet 32 ​​is equal to or greater than the width of the rivet 31, so as to avoid contact between the rivet 31 or the metal sheet 34 and the case body 11. On the other hand, the left ends of the first insulating sheet 33 and the second insulating sheet 32 ​​cannot exceed the intersection position between the arc-shaped surface and the side of the case body 11, so as to avoid insufficient sealing. The first insulating sheet 33 and the second insulating sheet 32 ​​can electrically insulate the rivet 31 from the case body 11, so as to avoid the occurrence of a short circuit. On the other hand, the first insulating sheet 33 and the second insulating sheet 32 ​​can improve the sealing performance of the positive electrode connection region 117, so as to avoid leakage of the electrolyte.

[0056] The metal sheet 34 may be provided with a stepped groove 35 at the location to be riveted by the rivet 31, and when the rivet 31 is pressed in, the end of the rivet 31 may be received in the groove to ensure that the end face of the pressed rivet 31 does not exceed the top end face of the metal sheet 34. This facilitates subsequent welding operations when the battery 100 is assembled into a module. The metal sheet 34 and the rivets 31 may be made of aluminum, nickel, copper, and other materials.

[0057] According to one embodiment of the present disclosure, the electrode core is a laminated electrode core. It should be noted that the laminated structure is adopted in this embodiment because the laminated structure has a higher space utilization rate. When the laminated structure is adopted, the electrode core may include a negative electrode sheet 22, a separator 23, and a positive electrode sheet 21, which are laminated in order. For example, the laminated electrode core has a substantially cubic shape, and the battery case 10, which is mainly defined by the lower cover 12, the case body 11, and the upper cover 13, may also have a substantially cubic shape. Correspondingly, the accommodation space 111 also has a substantially cubic shape to fit the laminated structure.

[0058] According to one embodiment of the present disclosure, as shown in FIG. 12 and FIG. 19 to FIG. 20, the stacking direction of the electrode cores is parallel to the axial direction of the electrolyte injection hole. Specifically, the electrode cores may be stacked along a direction perpendicular to the upper cover 12 or the lower cover 13, and the electrolyte injection hole is provided in the upper cover 12 or the lower cover 13. The electrode cores may also be stacked along a direction parallel to the upper cover 12 or the lower cover 13, and the electrolyte injection hole is provided in the case body 11. The stacking direction of the electrode cores is parallel to the axial direction of the electrolyte injection hole, so that the electrolyte can flow rapidly through the stacked electrode cores and penetrate the electrode cores well.

[0059] In some specific embodiments of the present disclosure, the electrode core includes a plurality of positive electrode sheets 21 and a plurality of negative electrode sheets 22. A positive electrode tab member is disposed at one end of each positive electrode sheet 21, and a negative electrode tab member is disposed at one end of each negative electrode sheet 22. The distance between one end of the negative electrode sheet 22 and the inner wall surface of the case body 11 is a first distance. The distance between the other end of the negative electrode sheet 22 and the inner wall surface of the case body 11 is a second distance. The sum of the first distance and the second distance is 2 mm or more and 5 mm or less.

[0060] In other words, the size of the negative electrode sheet is defined in this embodiment because the negative electrode active material layer needs to completely envelop the positive electrode active material layer. In the length direction of the battery 100, the distance between the lower end portion of the negative electrode sheet and the case body 11 is defined as h2, and the distance between the upper end portion of the negative electrode sheet and the case body 11 is defined as h3. By defining h2>0, h3>0, and 2mm≦h2+h3≦5mm, contact between the negative electrode sheet and the case body 11 is avoided to avoid bending of the electrode sheet and ensure that sufficient welding space is reserved for the tab. In addition, in the width direction of the battery 100, the distance between the left end portion of the negative electrode sheet and the case body 11 is h4, and the distance between the right end portion of the negative electrode sheet and the case body 11 is h5. By defining h4>0 and h5>0, contact between the negative electrode sheet and the case body 11 is avoided to avoid bending of the electrode sheet.

[0061] In summary, the battery case 10 according to the embodiment of the present disclosure includes an upper cover 13, a case body 11, and a lower cover 12. Both the lower cover 12 and the upper cover 13 are directly connected to the case body 11 in a vertical relationship such that there is no need to arrange a transition surface between the case body 11 and the upper cover 13 and between the case body 11 and the lower cover 12, thus reducing the impact of the transition surface on the dimensions of the battery 100 and improving the energy density of the battery 100. The battery 100 according to the embodiment of the present disclosure includes the battery case 10 according to any of the above embodiments, and the battery case 10 according to the embodiment of the present disclosure has the advantages of a large storage space 111 and the ability to store an electrode core body with high energy density. Therefore, the battery 100 according to the embodiment of the present disclosure also has the above advantages, and the energy density of the battery 100 is improved. This will not be described again here.

[0062] Although some specific embodiments of the present disclosure have been described in detail as examples, those skilled in the art should understand that the above examples are merely illustrative and are not intended to limit the scope of the present disclosure. Those skilled in the art should recognize that modifications may be made to the above embodiments without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A case body (11), the case body (11) having a storage space (111) defined therein, the case body (11) having two open ends, each open end communicating with the storage space (111); a lower cover (12) connected to one end of the case body (11) and configured to close one open end; an upper cover (13) connected to the other end of the case body (11) and configured to close the other open end; The battery case (10) wherein the lower cover (12) and / or the upper cover (13) are plate-like members, and the side walls of the case body (11) are perpendicular to the plate-like members.

2. The battery case (10) according to claim 1, wherein the thickness of the plate-like member is less than a wall thickness of the case body (11).

3. 3. The battery case (10) according to claim 1 or 2, wherein 30 μm≦w1≦100 μm, 30 μm≦w2≦100 μm, and 100 μm≦w3≦200 μm, and w1, w2, and w3 are the thicknesses of the upper cover (13), the lower cover (12), and the case body (11), respectively.

4. The battery case (10) according to any one of claims 1 to 3, wherein the case body (11) is provided with an electrolyte injection hole (112) and a conductive connection region.

5. The battery case (10) according to any one of claims 1 to 3, wherein the upper cover (13) or the lower cover (12) is provided with an electrolyte injection hole (112), and the case body (11) is provided with a conductive connection area.

6. The battery case (10) according to any one of claims 1 to 5, wherein at least a portion of the outer periphery of the open end exceeds the outer periphery of the corresponding lower cover (12) or upper cover (13).

7. 7. The battery case (10) according to claim 6, wherein ½ w3≦h2≦w3, h2 is the width of an overlapping area between the upper cover (13) or the lower cover (12) and the case body (11), and w3 is the thickness of the case body (11).

8. 8. The battery case (10) according to claim 7, wherein a notch (14) is formed between the outer periphery of the open end and the outer periphery of the corresponding lower cover (12) or upper cover (13), the case body (11) is welded to the lower cover (12) or upper cover (13) corresponding to the open end by laser welding, and a portion of a weld joint (113) formed by welding is positioned in the notch (14).

9. The battery case (10) of claim 8, wherein 1 / 2w3≦h2≦3 / 4w3.

10. The battery case (10) according to any one of claims 1 to 5, wherein the outer periphery of the open end is leveled with the outer periphery of the corresponding lower cover (12) or upper cover (13).

11. 8. The battery case (10) according to any one of claims 1 to 7, wherein the open end is connected to the corresponding lower cover (12) or upper cover (13) by laser welding, and a welded joint (113) formed by welding extends through the lower cover (12) or upper cover (13) corresponding to the open end to the case body (11).

12. 12. The battery case (10) according to claim 11, wherein 1 / 3w3≦w4≦1 / 2w3, w3 is the thickness of the case body (11), and w4 is the width of the case body (113).

13. 13. A battery case (10) according to any one of claims 1 to 12, wherein the case body (11) has an arc-shaped segment along the circumferential direction of the case body (11), and the outer contour of the lower cover (12) and / or the upper cover (13) is shaped identical to the outer contour of the case body (11).

14. 14. The battery case (10) according to any one of claims 1 to 13, wherein the outer surface of the case body (11) has a plurality of side surfaces connected in sequence, and the areas of the upper cover (13) and the lower cover (12) are each larger than the areas of each of the side surfaces.

15. A battery (100) comprising a battery case (10), the battery case (10) being the battery case (10) according to any one of claims 1 to 14.

16. the conductive connection region comprises a positive electrode connection region (117) and a negative electrode connection region (118); 16. The battery (100) of claim 15, further comprising an electrode core, the electrode core being disposed in the accommodation space (111), the electrode core comprising a positive electrode tab and a negative electrode tab (24), the positive electrode tab being electrically connected to the positive electrode connection region (117), and the negative electrode tab (24) being electrically connected to the negative electrode connection region (118).

17. 17. The battery (100) of claim 16, wherein the electrode core is a laminated electrode core.

18. The battery (100) according to claim 17, wherein the stacking direction of the electrode core bodies is parallel to the axial direction of the electrolyte injection hole.

19. The battery (100) of claim 18, wherein the electrode cores are stacked along a direction perpendicular to the upper cover (13) or the lower cover (12), and the electrolyte injection hole (112) is provided in the upper cover (13) or the lower cover (12).

20. The battery (100) according to claim 18, wherein the electrode cores are stacked along a direction parallel to the upper cover (13) or the lower cover (12), and the electrolyte injection hole (112) is provided in the case body (11).

21. 22. The battery (100) according to any one of claims 15 to 21, wherein the electrode core comprises a plurality of positive electrode sheets (21) and a plurality of negative electrode sheets (22), a positive electrode tab member is disposed at one end of each positive electrode sheet (21), a negative electrode tab member (24) is disposed at one end of each negative electrode sheet (22), a distance between one end of the negative electrode sheet (22) and an inner wall surface of the case body (11) is a first distance, a distance between the other end of the negative electrode sheet (22) and the inner wall surface of the case body (11) is a second distance, and a sum of the first distance and the second distance is 2 mm or more and 5 mm or less.

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