A battery casing and a battery

Abstract

This utility model discloses a battery casing and a battery, relating to the field of battery technology. The battery casing includes a housing and a cover plate; the housing includes a side frame, the side frame including a first open end; the cover plate is disposed at the first open end; one of the housing and the cover plate has an annular recess, and the other mates with the recess. When the cover plate is placed on the first open end of the housing, it is positioned relative to the housing through the engagement of the recess, preventing the cover plate from moving relative to the housing during welding, making welding more convenient and helping to ensure the dimensional accuracy of the manufactured battery casing.

Description

[0001] Priority information: This application claims priority to Chinese Utility Model Patent No. 202222356572.6, filed on September 5, 2022, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This utility model relates to the field of battery technology, and in particular to a battery casing and a battery. Background Technology

[0003] In related technologies, some batteries use alloys as the battery casing. Alloys possess high hardness and ductility, are thin, and do not require wide sealing edges or folds, thus reducing the battery's volume and increasing its volumetric energy density. For example, Figure 29 and Figure 30 A battery casing in the related art is shown, comprising a lower casing 10 and an upper cover 11 sealing the lower casing 10. The upper edge of the lower casing 10 forms a flange edge 12 extending outwardly, and the upper cover 11 fits against the flange edge 12. The lower casing 10 includes a base plate 100 and a side frame 101, and the connection between the base plate 100 and the side frame 101 is transitioned by a fillet 102.

[0004] The flange 12 and the upper cover 11 are connected by welding. During welding, the upper cover 11 needs to be placed on the upper surface of the flange 12. Since the mating surfaces of the two are relatively flat, they are prone to relative movement during welding, which affects the dimensional accuracy of the resulting battery casing. In order to keep the upper cover 11 and the lower casing 10 relatively fixed, a special fixture is required for positioning during welding to make the outer circumferential surfaces of the upper cover 11 and the flange 12 basically flush, so as to ensure the dimensional accuracy of the resulting battery casing.

[0005] In addition, in the related technology, the lower shell 10 is formed by stamping process, and its bottom plate 100 and side frame 101 are integrated. The characteristics of the stamping process result in the presence of a rounded corner 102 at the joint between the bottom plate 100 and the side frame 101. The presence of this rounded corner 102 will reduce the volume of the lower shell 10, and at the same time restrict the shape of the battery cell, reduce the volume of the battery cell, and make it impossible to fully utilize the volume of the lower shell 10, thus affecting the battery capacity.

[0006] In addition, the flange edge 12 of the battery casing needs to be cut off when installing the battery. It is difficult to guarantee the quality and accuracy of the cut during the cutting process, which makes the use of the battery more troublesome.

[0007] In addition, batteries are usually equipped with positive and negative electrodes. For batteries whose casings are made of alloy materials, at least one electrode needs to be insulated from the battery casing. How to reliably ensure the insulation between the electrode and the battery casing is also a problem that urgently needs to be solved.

[0008] Therefore, it is necessary to improve the existing technology to overcome the aforementioned defects. Utility Model Content

[0009] The purpose of this utility model is to provide a battery casing and a battery, wherein the cover plate of the battery casing can be conveniently positioned on the casing.

[0010] To achieve the aforementioned objectives, this utility model provides a battery casing, comprising:

[0011] The side frame is tubular and includes a first open end and a second open end located at both ends of the side frame.

[0012] A cover plate is provided at the first opening end; and,

[0013] A base plate is connected to the second opening end. The cover plate and the base plate respectively seal the first opening end and the second opening end. The cover plate, the base plate and the side frame are separately arranged. The cover plate and the base plate may have the same or different structures.

[0014] One of the side frame and the cover plate is provided with an annular recess, and the other is engaged with the recess.

[0015] Furthermore, one of the side frame and the bottom plate is also provided with an annular recess, and the other is engaged with the recess.

[0016] Furthermore, the base plate and the cover plate are limited by the same or different recessed structures.

[0017] Furthermore, the base plate is flat.

[0018] Furthermore, the outer edges of both the cover plate and the bottom plate do not extend beyond the fourth outer peripheral surface of the side frame.

[0019] Furthermore, the covering direction of the cover plate is consistent with the concave direction of the recess.

[0020] Furthermore, the end face of the first opening end is provided with the recessed portion, the recessed portion communicates with the inner cavity of the side frame, and the outer edge of the cover plate is fitted into the recessed portion.

[0021] Furthermore, the outer edge of the cover plate is provided with the recessed portion, the recessed portion is connected to the first outer peripheral surface of the cover plate and the surface of the cover plate facing the side frame, and the first opening end is fitted into the recessed portion.

[0022] Furthermore, it also includes an outer ring body connected to the side frame, the outer ring body having the recessed portion on its surface facing the cover plate, and the cover plate including a body and a limiting portion extending from the outer edge of the body into the recessed portion.

[0023] Furthermore, the cover plate and the side frame, as well as the bottom plate and the side frame, are connected by laser welding.

[0024] Furthermore, it also includes a negative electrode sheet electrically connected to the side frame, the side frame having an injection hole, and the battery housing also includes a plug connected to the side frame and sealing the injection hole. The housing, cover plate, and plug are all made of alloy material, which is stainless steel.

[0025] On the other hand, this utility model also proposes a battery casing, comprising:

[0026] case;

[0027] A positive electrode assembly, connected to the housing, includes a positive electrode metal component, a conductive sheet located inside the housing, an inner insulating component separating the conductive sheet and the housing, and an outer insulating component separating the positive electrode metal component and the housing. The positive electrode metal component includes a positive electrode sheet located outside the housing and a connecting post extending from the positive electrode sheet into the housing and connected to the conductive sheet.

[0028] The negative electrode is connected to the housing and located outside the housing.

[0029] Furthermore, the inner insulating component and the outer insulating component are integrally formed; or,

[0030] The inner insulating component and the outer insulating component are independent of each other and are connected to the housing through the positive electrode metal component.

[0031] Furthermore, the outer insulating member includes an outer insulating sheet located between the outer surface of the housing and the positive electrode sheet, and a boss surrounding the outer periphery of the positive electrode sheet;

[0032] The number of the bosses is at least two, and a through groove is formed between two adjacent bosses; or...

[0033] The boss is annular and has a through groove connecting its inner and outer walls.

[0034] Furthermore, the distance between the first surface of the positive electrode and the outer surface of the housing is greater than the distance between the second surface of the boss and the outer surface of the housing.

[0035] Furthermore, the inner insulating member includes an inner insulating sheet disposed between the inner surface of the housing and the conductive sheet, wherein the second outer peripheral surface of the inner insulating sheet is located outside the third outer peripheral surface of the conductive sheet.

[0036] Furthermore, the inner insulating member also includes an isolation boss connected to the inner insulating sheet, the isolation boss being located outside the conductive sheet to prevent the conductive sheet from extending beyond the second outer peripheral surface of the inner insulating sheet (520).

[0037] Furthermore, the isolation boss is provided with a notch, through which the conductive sheet can be observed circumferentially from the inner insulating member.

[0038] Furthermore, the conductive sheet is elongated;

[0039] The isolation boss at least surrounds the outer periphery of the distal end of the conductive sheet; or...

[0040] The isolation boss surrounds the outer periphery of one wide side and one long side of the conductive sheet; or,

[0041] The isolation boss surrounds the outer periphery of the three sides at the distal end of the conductive sheet; or,

[0042] The isolation boss is in the shape of a ring surrounding the outer periphery of the conductive sheet.

[0043] Furthermore, the connecting post passes through the end of the conductive sheet to form an outwardly protruding limiting protrusion, which fixes the conductive sheet, the inner insulating member, and the outer insulating member onto the housing.

[0044] Furthermore, the housing includes a side frame, the side frame including a first open end; and,

[0045] A cover plate is provided at the first opening end;

[0046] One of the housing and the cover plate is provided with an annular recess, and the other is engaged with the recess.

[0047] Furthermore, it also includes a bottom plate connected to the side frame, the cover plate and the bottom plate respectively sealing the two ends of the side frame, and the cover plate and the bottom plate do not extend beyond the fourth outer peripheral surface of the side frame.

[0048] Furthermore, the housing is integrally formed; or, the side frame and the bottom plate are separate components; both the housing and the cover plate are made of alloy material.

[0049] On the other hand, this utility model also proposes a battery casing, comprising:

[0050] A housing, including side frames, the side frames including a first open end, the housing not having a flange edge; and

[0051] A cover plate is provided at the first opening end, and the cover plate does not extend beyond the fourth outer peripheral surface of the side frame;

[0052] One of the housing and the cover plate is provided with an annular recess, and the other is engaged with the recess;

[0053] Both the housing and the cover plate are made of alloy material.

[0054] Furthermore, the recess has two angled surfaces, one of which fits into the component mating within the recess, and the other surface is annular; the two surfaces are perpendicular; or,

[0055] The two surfaces are inclined, and the annular surface is a cone that gradually narrows towards the side where the shell is located.

[0056] Furthermore, the covering direction of the cover plate is consistent with the concave direction of the recess.

[0057] Furthermore, the end face of the first opening end is provided with the recessed portion, the recessed portion communicates with the inner cavity of the side frame, the outer edge of the cover plate is fitted into the recessed portion, the recessed portion includes a first surface and a second surface set at an angle, the first surface is used to fit against the cover plate, and the second surface is annular.

[0058] Furthermore, the first face and the second face are perpendicular; or,

[0059] The second surface is inclined relative to the first surface, and the second surface is a conical surface that gradually increases in size towards the outside of the side frame.

[0060] Furthermore, the outer edge of the cover plate is provided with the recessed portion, the recessed portion communicates with the first outer peripheral surface of the cover plate and the surface of the cover plate facing the housing, the first opening end is fitted into the recessed portion, the recessed portion includes a third surface and a fourth surface arranged at an angle, the third surface is used to fit against the end face of the first opening end, and the fourth surface is annular.

[0061] Furthermore, the third surface and the fourth surface are perpendicular; or,

[0062] The fourth surface is inclined relative to the third surface, and the fourth surface is a conical surface that gradually narrows towards the side where the shell is located.

[0063] Furthermore, it also includes a base plate connected to the side frame, the base plate and the cover plate are respectively located at both ends of the side frame, the base plate and the side frame are integrally formed or separately set, and the base plate does not extend beyond the fourth outer peripheral surface of the side frame.

[0064] Furthermore, the base plate and the side frame are separately provided, and one of the side frame and the base plate is also provided with an annular recess, while the other is connected to the recess. The base plate and the cover plate use the same or different recess structures for positioning.

[0065] Furthermore, the battery casing also includes a positive electrode metal component connected to the side frame and at least partially located outside the side frame;

[0066] The housing and / or the cover plate are the negative electrode of the battery housing, or the battery housing further includes a negative electrode sheet connected to the side frame and located outside the side frame.

[0067] On the other hand, this utility model proposes a battery, including the battery casing as described above.

[0068] Compared with the prior art, the present invention has the following beneficial effects:

[0069] According to at least one embodiment of the present invention, the battery casing includes a side frame, a cover plate, and a bottom plate. The cover plate and the bottom plate are separately disposed and respectively seal the two open ends of the side frame. One of the side frame and the cover plate has an annular recess, and the other mates with the recess. When the cover plate is placed on the first open end of the side frame, it is positioned relative to the side frame through the mating of the recess, thereby preventing the cover plate from moving relative to the side frame during welding. This results in better positional accuracy, makes welding more convenient, and helps ensure the dimensional accuracy of the manufactured battery casing.

[0070] According to at least one embodiment of the present invention, the battery casing includes a casing, a positive electrode assembly, and a negative electrode plate. Both the positive electrode assembly and the negative electrode plate are connected to the casing. The positive electrode assembly includes a positive electrode metal component, a conductive plate located inside the casing, an inner insulating component separating the conductive plate from the casing, and an outer insulating component separating the positive electrode metal component from the casing. The inner and outer insulating components in the positive electrode assembly connected to the casing effectively separate the positive electrode assembly from the casing, thereby ensuring insulation between the electrode and the battery casing.

[0071] According to at least one embodiment of the present invention, the battery housing includes a housing and a cover plate. The housing does not have a flange edge, and the cover plate does not extend beyond the outer peripheral surface of the side frame in the housing. One of the side frame and the cover plate is provided with an annular recess, and the other is engaged with the recess. Attached Figure Description

[0072] Figure 1 This is a schematic diagram of the battery casing in Example 1.

[0073] Figure 2 This is a schematic diagram of the shell structure in Example 1.

[0074] Figure 3 This is a cross-sectional view of the sidewall at the first opening end in Embodiment 1.

[0075] Figure 4 yes Figure 2 A magnified view of a section at point I.

[0076] Figure 5 This is a schematic diagram of the connection between the cover plate and the side frame in Embodiment 1, with the second side in the diagram being inclined.

[0077] Figure 6 This is a front view of the battery casing in Example 1.

[0078] Figure 7 It is along Figure 6 A cross-sectional view obtained by cutting along section AA.

[0079] Figure 8 yes Figure 7 A magnified view of section II in the middle.

[0080] Figure 9 This is an exploded view of the battery casing in Example 1.

[0081] Figure 10 This is a cross-sectional view of the insulating component of a battery casing in Example 1.

[0082] Figure 11 This is a schematic diagram showing the connection between the outer insulating component and the positive electrode plate of a battery casing in Example 1.

[0083] Figure 12 This is a schematic diagram showing the connection between the outer insulating component and the positive electrode plate of a battery casing in Example 1.

[0084] Figure 13 This is a schematic diagram showing the connection between the outer insulating component and the positive electrode plate of a battery casing in Example 1.

[0085] Figure 14 This is a schematic diagram of the positive electrode assembly of a battery casing in Example 1.

[0086] Figure 15 This is a schematic diagram of the connection between an inner insulating component and an inner conductive sheet in Embodiment 1.

[0087] Figure 16 This is a schematic diagram of the connection between an inner insulating component and an inner conductive sheet in Embodiment 1.

[0088] Figure 17 This is a cross-sectional schematic diagram of the positive electrode assembly of a battery casing in Embodiment 1.

[0089] Figure 18 This is a cross-sectional view of the battery casing in Example 2.

[0090] Figure 19 This is a cross-sectional view of the edge of the cover plate in Example 2.

[0091] Figure 20 yes Figure 18 A magnified view of a section of section III.

[0092] Figure 21 This is a schematic diagram of the connection between the cover plate and the side frame in Embodiment 1, with the fourth side in the diagram being inclined.

[0093] Figure 22 This is a cross-sectional view of the battery casing in Example 3.

[0094] Figure 23 yes Figure 22 A magnified view of section IV in the middle.

[0095] Figure 24 This is a cross-sectional view of the battery casing in Example 3.

[0096] Figure 25 yes Figure 24 A magnified view of the middle V section.

[0097] Figure 26 This is a schematic diagram of an L-shaped cover plate in Example 3.

[0098] Figure 27 This is a cross-sectional view of the battery casing in Example 4.

[0099] Figure 28 yes Figure 27 A magnified view of section VI in the middle.

[0100] Figure 29 This is a schematic diagram of the structure of a battery casing according to an embodiment of the related technology.

[0101] Figure 30 yes Figure 29 The cross-sectional view of the battery casing shown. Detailed Implementation

[0102] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, it should be noted that, for ease of description, only the parts relevant to this application are shown in the accompanying drawings, not the entire structure. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0103] The terms “comprising” and “having”, and any variations thereof, used in this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0104] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0105] Example 1

[0106] like Figure 1 As shown in the figure, this embodiment proposes a battery casing, including a casing 2 and a cover plate 3.

[0107] The shape of the battery casing is not limited, for example... Figure 1 In the illustrated embodiment, the battery casing is rectangular in shape. In other embodiments, the battery casing may also be L-shaped, circular, triangular, or other shapes.

[0108] The housing 2 includes a side frame 20, which is a closed ring and includes a first open end 200. A cover plate 3 is disposed at the first open end 200, is connected to the first open end 200, and closes the first open end 200, forming a space between the housing 2 and the cover plate 3 for accommodating components such as battery cells.

[0109] One of the housing 2 and the cover plate 3 is provided with an annular recess 4, and the other is engaged with the recess 4. The housing 2 and the cover plate 3 are positioned by the engagement of the recess 4 with the housing 2 or the cover plate 3, which prevents the two from moving relative to each other during the welding process and makes the position more accurate.

[0110] In a preferred embodiment, the covering direction of the cover plate 3 is consistent with the concave direction of the recessed portion 4. Thus, when the cover plate 3 is placed on the first opening end 200 of the housing 2, it can be placed on the housing 2 along the concave direction of the recessed portion 4, allowing the cover plate 3 and the housing 2 to engage via the recessed portion 4. Preferably, the covering direction of the cover plate 3 is consistent with the axial direction A of the side frame 20. In this case, the recessed portion 4 is recessed into the housing 2 or the cover plate 3 along the axial direction A.

[0111] In this embodiment, as Figures 2 to 4 As shown, the end face 201 of the first opening end 200 is provided with a recess 4, which communicates with the inner cavity 202 of the side frame 20. The outer edge of the cover plate 3 is fitted into the recess 4. In this way, the circumferential freedom of the cover plate 3 is limited by the side frame 20, and it cannot move horizontally. Its position with the shell 2 is more accurate, which makes it easier to carry out welding operations.

[0112] The recess 4 has a first surface 40 and a second surface 41 arranged at an angle. The first surface 40 is used to fit against the cover plate 3, and the second surface 41 is annular. In some embodiments, such as Figure 3 and Figure 4 As shown, the first surface 40 and the second surface 41 are perpendicular. In other embodiments, such as Figure 5 As shown, the second surface 41 is inclined and has a tapered surface that gradually increases outward, which can serve as a guide to facilitate the placement of the cover plate 3 in the recess 4. Preferably, the first outer peripheral surface 3a of the cover plate 3 also has a tapered surface that matches the second surface 41 to reduce the gap between the two and improve the sealing performance.

[0113] In this embodiment, as Figure 2 As shown, the housing 2 also includes a bottom plate 24 connected to the side frame 20. The bottom plate 24 and the cover plate 3 are located at the two ends of the side frame 20, respectively. The bottom plate 24 and the side frame 20 are integrally formed. For example, the housing 2 can be formed by stretch forming. The housing 2 only has a first open end 200.

[0114] As a preferred implementation method, such as Figure 6 and Figure 7 As shown, an explosion-proof valve 30 can be provided on the cover plate 3 or the housing 2 (e.g., side frame 20 or bottom plate 24) to improve the safety of battery use. The explosion-proof valve 30 is preferably in the shape of an arc-shaped groove, and more preferably in the shape of a quarter arc. The explosion-proof valve 30 is preferably located at the corner of the cover plate 3.

[0115] The battery casing also includes a positive electrode assembly 5 connected to the casing 2, see reference. Figures 6 to 9The positive electrode assembly 5 is connected to the side frame 20 and includes a positive electrode metal part 50, a conductive sheet 51 located inside the housing 2, an inner insulating part 52 separating the conductive sheet 51 and the housing 2, and an outer insulating part 53 separating the positive electrode metal part 50 and the housing 2.

[0116] The positive electrode metal component 50 includes a positive electrode sheet 500 located outside the housing 2 and a connecting post 501 disposed on the positive electrode sheet 500. The connecting post 501 passes through the outer insulator 53, the side frame 20, and the inner insulator 52 and is connected to the conductive sheet 51. The material of the positive electrode metal component 50 can be, for example, aluminum, which is electrically connected to the conductive sheet 51. The conductive sheet 51 is used for electrical connection with the first tab of the battery cell. The material of the conductive sheet 51 is preferably the same as that of the positive electrode metal sheet 50. Preferably, the positive electrode metal component 50 is connected to the housing 2 by riveting. The end of the connecting post 501 that passes through the conductive sheet 51 is riveted to form an outwardly protruding limiting protrusion 502. The limiting protrusion 502 simultaneously fixes the conductive sheet 51, the inner insulator 52, and the outer insulator 53 to the housing 2.

[0117] The outer insulating component 53 is made of insulating material and is used to separate the positive electrode metal component 50 and the housing 2 to prevent them from coming into contact and short-circuiting. The material of the outer insulating component 53 can be, for example, PFA plastic. Figure 10 and Figure 11 As shown, the outer insulating member 53 includes an outer insulating sheet 530 disposed between the outer surface of the housing 2 and the positive electrode plate 500, and two strip-shaped protrusions 531 located on the outer periphery of the positive electrode plate 500. Figures 9 to 11 As shown, the housing 2 has a first through hole 27, and the outer insulating member 53 has a protruding ring 533 connecting the outer insulating sheet 530 and the inner insulating member 52. A second through hole 523 is provided inside the protruding ring 533, through which the connecting post 501 enters the housing 2 and connects to the conductive sheet 51. The protruding ring 533 effectively prevents the connecting post 501 from contacting the wall of the first through hole 27, thereby improving the insulation effect. Two bosses 531 protrude outward from the outer insulating sheet 530 and are located on both sides of the positive electrode sheet 500 along its length, preventing external objects from contacting the positive electrode metal member 50 and causing a short circuit.

[0118] like Figures 9 to 11 As shown, a through groove 532 is formed between the two bosses 531. The through groove 532 allows people to observe the bonding quality of the positive electrode 500 and the outer insulating sheet 530 from the side (i.e., the circumferential direction of the outer insulating member 53), thereby ensuring a reliable connection between the positive electrode metal member 50 and the housing 2. It is understood that the number of bosses 531 is not limited to two; for example, two bosses 531 can also be provided in the width direction of the positive electrode 500.

[0119] Furthermore, such as Figure 12As shown, the boss 531 can also be configured as a ring, which can more comprehensively isolate the internal positive electrode plate 500. The boss 531 has through slots 532 connecting its inner and outer sides. The number of through slots 532 is unlimited; for example, Figure 12 A through groove 532 is provided on each of the left and right sides of the positive electrode 500, allowing the bonding quality between the positive electrode 500 and the outer insulating sheet 530 to be observed from both sides. For example, Figure 13 In the middle, through grooves 532 are provided on the left and right sides and the top and bottom sides of the positive electrode 500, so that the bonding quality of the positive electrode 500 and the outer insulating sheet 530 can be observed from the left and right sides and the top and bottom sides of the positive electrode 500.

[0120] Preferably, the positive electrode 500 is rectangular, and its position can be defined by the boss 531 to prevent it from rotating. Since the positive electrode metal part 50 may tilt when connected to the housing 2 via riveting or other processes, the upper and lower ends of the positive electrode 500 may approach or even extend beyond the upper and lower sides of the housing 2. The positive electrode 500 and the housing 2 are prone to direct conductivity due to contact with external objects, posing a risk of short circuit. When the positive electrode 500 is blocked by the boss 531, the boss 531 can separate the positive electrode 500 from external objects, thereby improving safety and reliability. Preferably, refer to... Figure 8 The distance L0 between the first surface 5000 of the positive electrode 500 and the outer surface of the side frame 20 is greater than the distance L1 between the second surface 5310 of the boss 531 and the outer surface of the side frame 20. In this way, the positive electrode 500 is more prominent, which makes it easier to contact and connect with external electrical devices.

[0121] The inner insulating component 52 is made of an insulating material to separate the conductive sheet 51 and the housing 2, preventing short circuits between them. The material of the inner insulating component 52 can be, for example, PFA plastic. Figure 8 and Figure 10 As shown, the inner insulating member 52 includes an inner insulating sheet 520 disposed between the inner surface of the housing 2 and the conductive sheet 51. As mentioned above, the positive electrode metal member 50 may tilt, and similarly, the conductive sheet 51 may also tilt due to rotation around the connecting post 501. Thus, after the battery is manufactured, the conductive sheet 51 may come into contact with the cover plate 3 or the bottom plate 24, causing a short circuit. To avoid this risk of short circuit, in this invention, the inner insulating sheet 520 is configured to contact the cover plate 3 or the bottom plate 24 before the conductive sheet 51 when it is tilted, thereby improving safety.

[0122] like Figure 14 As shown, in a preferred embodiment, the second outer peripheral surface 5200 of the inner insulating sheet 520 is located outside the third outer peripheral surface 511 of the conductive sheet 51, so that the inner insulating sheet 520 can contact the cover plate 3 or the bottom plate 24 before the conductive sheet 51.

[0123] Furthermore, the inner insulating member 52 also includes an isolation boss 521 connected to the conductive sheet 51. The isolation boss 521 is located outside the conductive sheet 51 and is used to prevent the conductive sheet 51 from moving relative to the inner insulating member 52 beyond the second outer peripheral surface 5200. In this way, it can be ensured that the conductive sheet 51 will not tilt relative to the inner insulating member 52 and extend beyond the second outer peripheral surface 5200 of the inner insulating member 52, thereby further improving safety.

[0124] The isolation boss 521 can surround the entire circumference of the conductive sheet 51, or it can only surround a portion of the outer circumference of the conductive sheet 51. Preferably, when the conductive sheet 51 is elongated, the isolation boss 521 surrounds at least the outer circumference of the distal end 510 of the conductive sheet 51. The distal end 510 refers to the end of the conductive sheet 51 that is farther from the connecting post 501 in the length direction. Since the distal end 510 is most likely to contact the cover plate 3 or the base plate 24 when the conductive sheet 51 rotates and tilts about the connecting post 501, the isolation boss 521 surrounding the distal end 510 can reliably ensure the isolation effect.

[0125] In some implementations, such as Figure 14 As shown, the isolation boss 521 surrounds the outer periphery of one wide side and one long side of the conductive sheet 51. In some embodiments, such as Figure 15 As shown, the isolation boss 521 surrounds the outer periphery of three sides of the distal end 510. In some embodiments, such as Figure 16 As shown, the isolation boss 521 is in the shape of a ring surrounding the outer periphery of the conductive sheet 51.

[0126] Similar to the through slot 532 provided on the outer insulating component 53, such as Figure 14 and Figure 15 As shown, the inner insulating member 52 has a notch 522 formed on the isolation boss 521. The conductive sheet 51 can be observed from the circumference of the inner insulating member 52 through the notch 522, thereby judging the bonding quality between the conductive sheet 51 and the inner insulating sheet 520.

[0127] The inner insulating component 52 and the outer insulating component 53 can be integrally formed or they can be two separate parts. For example, Figure 8 and Figure 10 In the illustrated case, the inner insulating member 52 and the outer insulating member 53 are integrally formed, while Figure 17 In the illustrated case, the inner insulating member 52 and the outer insulating member 53 are two separate parts connected to the side frame 20 via the positive electrode metal member 50.

[0128] Both the casing 2 and the cover plate 3 are made of alloy. The second electrode tab of the battery cell can be connected to any one of the side frame 20, the cover plate 3, and the bottom plate 24, so that the casing 2 and the cover plate 3 become the negative electrode of the battery. In some cases, when the battery is in use, conductive parts such as conductive sheets or wires connected to the negative electrode need to be soldered to the negative electrode of the battery. However, the casing 2 and the cover plate 3 are thin, and conventional soldering methods can easily damage the casing 2 or the cover plate 3. Therefore, as a preferred embodiment, refer to... Figure 1 and Figure 9 The battery casing also includes a negative electrode 6 electrically connected to the casing 2. The negative electrode 6 is attached to the outer surface of the casing 2, for example, by laser welding. The negative electrode 6 increases the thickness of this portion of the casing 2, effectively preventing risks such as solder burn-through and damage to the casing 2 when welding conductive components to it. Furthermore, the negative electrode 6 can be made of an easy-to-weld material, facilitating welding. In some embodiments, the negative electrode 6 is a nickel sheet.

[0129] It is understandable that the negative electrode 6 can be connected to the cover plate 3 or the base plate 24 in addition to being connected to the housing 2.

[0130] like Figure 1 and Figure 9 As shown, the housing 2 has a liquid injection hole 26, through which liquid can be injected into the housing 2. The battery housing also includes a liquid plug 8 connected to the housing 2 and sealing the liquid injection hole 26. The liquid plug 8 can be welded to the housing 2, for example, by laser welding.

[0131] The shell 2, cover plate 3 and liquid plug 8 are all made of alloy material, preferably stainless steel, and more preferably stainless steel 316L.

[0132] Example 2

[0133] The difference between this embodiment and embodiment 1 is that in this embodiment, the recessed portion 4 is provided on the cover plate 3, rather than on the housing 2.

[0134] like Figures 18 to 20 As shown, a recess 4 is provided on the outer edge of the cover plate 3. The recess 4 communicates with the first outer peripheral surface 3a of the cover plate 3 and the surface 3b of the cover plate 3 facing the housing 2. The first opening end 200 is fitted into the recess 4. Since the outer edge of the cover plate 3 is provided with an annular recess 4, the portion of the cover plate 3 located in the recess 4 forms a protrusion 3c. When the first opening end 200 is fitted into the recess 4, the protrusion 3c is located within the side frame 20, thereby restricting the circumferential freedom of the cover plate 3 and preventing horizontal movement. This reliably improves the positional accuracy of the cover plate 3 and the housing 2, facilitating welding operations.

[0135] In this embodiment, the recessed portion 4 includes a third surface 42 and a fourth surface 43 arranged at an angle, wherein the third surface 42 is used to fit against the end face of the first opening end 200, and the fourth surface 43 is annular. In some embodiments, such as Figure 19 and Figure 20 As shown, the third surface 42 and the fourth surface 43 are perpendicular. In other embodiments, such as Figure 21 As shown, the fourth surface 43 is inclined and has a tapered shape that gradually tapers towards the side where the housing 2 is located. It serves as a guide to facilitate the insertion of the cover plate 3 into the upper part of the housing 2. Preferably, the first opening end 200 is provided with an annular tapered surface 430 that is adapted to the fourth surface 43, so as to reduce the gap between the two and improve the sealing performance.

[0136] Example 3

[0137] The difference between this embodiment and Embodiment 1 is that, in this embodiment, as... Figures 22 to 25 As shown, the housing 2 includes an outer ring 21 connected to the side frame 20. The outer ring 21 is annular and is located at the top of the first opening end 200 of the side frame 20, protruding along the outer periphery of the side frame 20. A recess 4 is provided on the surface of the outer ring 21 facing the cover plate 3. The cover plate 3 includes a plate-shaped body 32 and a limiting portion 31 extending from the outer edge of the body 32 into the recess 4. In this embodiment, the recess 4 is an annular groove with an opening at only one end.

[0138] In some embodiments, the cover plate 3 includes at least two limiting portions 31 arranged at an angle. For example, one limiting portion 31 is provided on each of the two adjacent sides of the rectangular cover plate 3, or two limiting portions 31 are provided at intervals on the outer edge of the circular first cover plate 3. Since the limiting portions 31 are arranged at an angle and are not parallel, the cover plate 3 can be prevented from moving horizontally relative to the housing 2.

[0139] In other embodiments, the limiting portion 31 is annular, and the fit between it and the annular recess 4 is tighter, resulting in a better limiting effect.

[0140] In a preferred embodiment, the cover plate 3 is integrally formed, and the thickness of the body 32 and the limiting part 31 is the same. For example, the annular limiting part 31 is stretched out on the outer edge of the cover plate 3 by stretch forming.

[0141] In a preferred embodiment, the housing 2 is also integrally formed, with the side frame 20 and the outer ring 21 having the same thickness. For example, the outer ring 21 is stretched at one end of the housing 2 by stretching, and then the recess 4 is formed on the outer ring 21 by stamping.

[0142] like Figure 25As shown, the outer ring 21 includes a horizontally arranged connecting plate portion 210, and a recessed portion 4 is located on the outside of the connecting plate portion 210. The connecting plate portion 210 is used to fit against the body 32 so that the cover plate 3 has a larger contact area when connected to the housing 2, which facilitates laser welding and improves the strength of the connection.

[0143] As mentioned above, the battery casing is not limited to being rectangular; for example, Figure 26 A cover plate 3 of an L-shaped battery casing is shown.

[0144] Example 4

[0145] It is understandable that, in addition to being integrally formed with the side frame 20, the base plate 24 can also be separately set from the side frame 20.

[0146] like Figure 27 As shown, in this embodiment, the side frame 20 is tubular and includes a second open end 203, with the bottom plate 24 connected to the second open end 203. The cover plate 3 and the bottom plate 24 respectively seal the first open end 200 and the second open end 203. Figure 27 In the embodiment shown, the side frame 20 is in the shape of a square tube. It is understood that in other embodiments, the side frame 20 may also be circular, L-shaped or other shapes.

[0147] In some embodiments, the base plate 24 is flat and is not positioned relative to the side frame 20 by the aforementioned recess 4.

[0148] In some embodiments, one of the base plate 24 and the side frame 20 is provided with an annular recess 4, and the other mates with the recess 4, that is, the two are positioned by the recess 4. The structure and arrangement of the recess 4 can be referred to embodiments 1 to 3. Further, the structures of the base plate 24 and the cover plate 3 can be the same or different. In the same case, both use the same recess 4 structure for positioning; in different cases, both use different recess 4 structures for positioning.

[0149] like Figure 27 and Figure 28 As shown, Figure 27 and Figure 28 In the illustrated configuration, both the base plate 24 and the cover plate 3 have annular recesses 4 on their outer edges. The two ends of the side frame 20 are respectively engaged with the two recesses 4. A closed cavity is formed between the cover plate 3, the side frame 20, and the base plate 24 to accommodate components such as the battery cell.

[0150] Since the two ends of the side frame 20 are sealed by the cover plate 3 and the bottom plate 24 respectively, and the cover plate 3 and the bottom plate 24 are independent parts that are not integrally formed with the side frame 20, the connection position between the side frame 20 and the cover plate 3 and the bottom plate 24 will not form a rounded transition part, which will not easily affect the volume of the receiving cavity 7. At the same time, since there is no obstruction from the rounded transition part, the shape of the cell set in the battery casing can be made more full, the space utilization rate is higher, and the capacity of the battery is larger, which effectively improves the energy density of the battery.

[0151] The materials for the casing 2 and the cover plate 3 are preferably alloys, such as 316L stainless steel. The alloys have good ductility, allowing for thinner designs and further increasing the internal space of the battery casing. The cover plate 3 and the side frame 20, as well as the base plate 24 and the side frame 20, are connected by laser welding. The laser welding forms a ring-shaped weld, providing a good seal.

[0152] The outer edges of the cover plate 3 and the bottom plate 24 do not extend beyond the fourth outer peripheral surface 28 of the side frame 20, and the end of the side frame 20 does not need to have an annular protruding part to fit with the cover plate 3. In this way, the formed battery casing does not have a protruding flange edge, eliminating the step of cutting the flange edge when installing the battery, making installation more convenient. At the same time, the fitting precision of the cover plate 2, the bottom plate 24 and the side frame 20 is higher, and the dimensional accuracy of the battery shape will not be affected by cutting the flange edge.

[0153] Example 5

[0154] This embodiment proposes a battery that includes the battery casing described above.

[0155] The battery also includes a battery cell housed within the battery casing. The battery cell includes a first tab and a second tab. The first tab is connected to a conductive sheet 51, and the second tab is connected to any one of the side frame 20, the cover plate 3, and the base plate 24. The positive electrode metal piece 50 and the negative electrode sheet 6 serve as the positive and negative electrodes of the battery, respectively.

[0156] The above are merely specific embodiments of this utility model. Any improvements made based on the concept of this utility model shall be considered within the scope of protection of this utility model.

Claims

1. A battery casing, characterized in that, include: The side frame (20) is tubular and includes a first open end (200) and a second open end (203) located at both ends of the side frame (20). Cover plate (3), provided at the first opening end (200); and, The base plate (24) is connected to the second opening end (203). The cover plate (3) and the base plate (24) respectively seal the first opening end (200) and the second opening end (203). The cover plate (3), the base plate (24) and the side frame (20) are separately provided. The cover plate (3) and the base plate (24) have the same or different structures. One of the side frame (20) and the cover plate (3) is provided with an annular recess (4), and the other is engaged with the recess (4).

2. The battery casing as described in claim 1, characterized in that, One of the side frame (20) and the bottom plate (24) is also provided with an annular recess (4), and the other is connected to the recess (4).

3. The battery casing as described in claim 2, characterized in that, The base plate (24) and the cover plate (3) are limited by the same or different recessed part (4) structures.

4. The battery casing as described in claim 1, characterized in that, The base plate (24) is flat.

5. The battery casing as described in claim 1, characterized in that, The outer edges of the cover plate (3) and the bottom plate (24) do not extend beyond the fourth outer peripheral surface (28) of the side frame (20).

6. The battery casing as described in claim 1, characterized in that, The covering direction of the cover plate (3) is consistent with the concave direction of the recess (4).

7. The battery casing as described in claim 1, characterized in that, The end face (201) of the first opening end (200) is provided with the recess (4), the recess (4) communicates with the inner cavity (202) of the side frame (20), and the outer edge of the cover plate (3) is fitted into the recess (4).

8. The battery casing as described in claim 1, characterized in that, The outer edge of the cover plate (3) is provided with the recess (4), the recess (4) communicates with the first outer peripheral surface (3a) of the cover plate (3) and the surface of the cover plate (3) facing the side frame (20), and the first opening end (200) is fitted into the recess (4).

9. The battery casing as described in claim 1, characterized in that, It also includes an outer ring (21) connected to the side frame (20), the outer ring (21) having the recess (4) on its surface facing the cover plate (3), the cover plate (3) including a body (32) and a limiting part (31) extending from the outer edge of the body (32) into the recess (4).

10. The battery casing as claimed in claim 1, characterized in that, The cover plate (3) and the side frame (20), as well as the base plate (24) and the side frame (20), are connected by laser welding.

11. The battery casing as claimed in any one of claims 1 to 10, characterized in that, It also includes a negative electrode plate (6) electrically connected to the side frame (20), the side frame (20) having an injection hole (26), the battery housing also includes a plug (8) connected to the side frame (20) and sealing the injection hole (26), the housing (2), the cover plate (3) and the plug (8) are all made of alloy material, the alloy material being stainless steel.

12. A battery, characterized in that, Includes the battery casing as described in any one of claims 1 to 11.

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