Battery shell and battery

Abstract

The utility model provides a battery shell and battery, including first shell and second shell, first shell and second shell are both hollow structure with one end open, the open end of first shell is used for being connected with the open end of second shell, the open end of first shell is provided with at least one bulge, and the bulge is provided with at least one through hole. At least one groove is formed in the open end of the second shell, and when the protrusion is embedded into the groove, the open end of the first shell is connected with the open end of the second shell in a sealed mode. According to the utility model, the design that the bulge is embedded into the groove is adopted, so that the problem of insufficient stainless steel shell punching depth is solved, and the use of a thick battery cell can be met; and the design that the bulges are embedded into the grooves is adopted, so that the problem of welding failure caused by poor profile tolerance of the steel shell and irregular alignment of the opening ends of the first shell and the second shell is avoided, and the welding effectiveness of the first shell and the second shell and the safety of the battery cell are ensured through the design that the bulges and the grooves are effectively combined by the first shell and the second shell.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, concretely relates to a battery casing and battery. BACKGROUND

[0002] The structure of the current battery casing includes the following structures:

[0003] The steel shell includes upper steel shell and lower steel shell, the upper steel shell and the lower steel shell are designed through flange edge, and the upper steel shell and the lower steel shell are welded as a whole through laser welding at the flange edge; but the flange structure increases the size and weight of the steel shell;

[0004] The steel shell includes upper steel shell and lower steel shell, the upper steel shell and the lower steel shell are directly welded together; but when the size of the upper steel shell and the lower steel shell is large, the contour degree is difficult to guarantee when directly welding, and the positioning and welding difficulty are increased;

[0005] The steel shell includes upper cover plate, lower cover plate and four-frame design between the upper cover plate and the lower cover plate; but the three-section design adds a welding process, increases the welding and weld detection time and steps, and increases the welding failure rate;

[0006] The steel shell includes upper steel shell and lower steel shell, the upper steel shell covers the lower steel shell, and the contact surface is various arc / step combination modes, but for small battery cell and small size shell, the shell wall thickness of the upper steel shell and the lower steel shell is thin, the step design reduces the contact position strength, and the material is easy to deform and affects the reliability of laser welding; the arc covering design increases the size of the battery cell, the processing difficulty and the incoming material cost; therefore, how to overcome the above technical problems and defects becomes a key problem to be solved. INVENTION CONTENTS

[0007] In view of the welding difficulty or low welding reliability of the existing battery casing, the utility model provides a battery casing and battery.

[0008] The technical scheme adopted by the utility model to solve the above technical problems is as follows:

[0009] The utility model provides a battery casing in one aspect, including first casing and second casing, the first casing and the second casing are all hollow structure of one end opening, the opening end of the first casing is used for with the opening end of the second casing is connected, at least one convex is provided on the opening end of the first casing, at least one recess is provided on the opening end of the second casing, when the convex is embedded in the recess, the opening end of the first casing is sealed with the opening end of the second casing Connection.

[0010] Optionally, the first shell is a rectangular shell, the first shell comprises a first bottom surface, two first side surfaces and two second side surfaces, the two first side surfaces and the two second side surfaces are arranged alternately to form a first frame, one end of the first frame is connected with four edges of the first bottom surface respectively, the other end of the first frame is a first opening end, and the first opening end of the first frame is provided with a plurality of protrusions.

[0011] Optionally, the protrusion comprises a first protrusion and a second protrusion, and at least one first protrusion is arranged on one side of the first opening end of the first frame; and at least one second protrusion is arranged on one side of the first opening end of the first frame.

[0012] Optionally, the length direction of the first side surface, the second side surface, the first protrusion and the second protrusion is parallel to the first bottom surface; the length of the first side surface is L1, the length of the second side surface is L2, the length of the first protrusion is L3, and the length of the second protrusion is L4; the L1 and the L3 satisfy the relationship formula: 1 / 3≤L3 / L1≤2 / 3, and the L2 and the L4 satisfy the relationship formula: 1 / 3≤L4 / L2≤2 / 3.

[0013] Optionally, the width direction of the first side surface, the second side surface, the first protrusion and the second protrusion is perpendicular to the first bottom surface; the width of the first side surface is W1, the width of the second side surface is W2, the width of the first protrusion is W3, and the width of the second protrusion is W4; the W1 and the W3 satisfy the relationship formula: 1 / 3≤W3 / W1≤2 / 3, and the W2 and the W4 satisfy the relationship formula: 1 / 3≤W4 / W2≤2 / 3.

[0014] Optionally, the second shell is a rectangular shell, the second shell comprises a second bottom surface, two third side surfaces and two fourth side surfaces, the two third side surfaces and the two fourth side surfaces are arranged alternately to form a second frame, one end of the second frame is connected with four edges of the second bottom surface respectively, the other end of the second frame is a second opening end, and the second opening end of the second frame is provided with a plurality of grooves.

[0015] Optionally, the groove comprises a first groove and a second groove, and at least one first groove is arranged on one side of the second opening end of the second frame; and at least one second groove is arranged on one side of the second opening end of the second frame.

[0016] Optionally, the length direction of the first groove and the second groove is parallel to the direction in which the second bottom surface lies; the length of the first groove is L5, and the length of the second groove is L6; the L5 and the L3 satisfy the relationship: 0 < L5-L3 ≤ 0.15, unit: mm; the L6 and the L4 satisfy the relationship: 0 < L6-L4 ≤ 0.15, unit: mm.

[0017] Optionally, the width direction of the first groove and the second groove is perpendicular to the direction in which the second bottom surface lies; the width of the first groove is W5, and the width of the second groove is W6; the W5 and the W3 satisfy the relationship: |W5-W3| ≤ 0.075, unit: mm; the W6 and the W4 satisfy the relationship: |W6-W4| ≤ 0.075, unit: mm.

[0018] Optionally, the battery further comprises a pole and a liquid injection hole, and the pole and the liquid injection hole are arranged on the first shell.

[0019] The utility model discloses a battery in another aspect, including electric core and above-mentioned battery shell, electric core is placed in battery shell.

[0020] According to the battery shell, the convex is arranged on the opening end of the first shell, the groove is arranged on the opening end of the second shell, the convex is embedded in the groove, the first shell and the second shell are positioned, the steel shell is more closely attached, and laser welding is facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme of the embodiment of the utility model, the following will be briefly introduced to the drawings needed to be used in the description of the embodiment of the utility model, and obviously, the drawings in the following description are only some embodiments of the utility model, and for the ordinary skilled in the art, other drawings can be obtained according to these drawings without the creative labor.

[0022] Figure 1 It is the structural schematic diagram of battery shell provided by an embodiment of the utility model;

[0023] Figure 2 It is the structural schematic diagram of the first shell in the battery shell provided by an embodiment of the utility model.

[0024] Figure 3 is a structure schematic view of the second shell in the battery shell, provided by an embodiment of the utility model;

[0025] Figure 4 is a label schematic view of the first shell in the battery shell, provided by an embodiment of the utility model;

[0026] Figure 5 is a label schematic view of the second shell in the battery shell, provided by an embodiment of the utility model;

[0027] The reference signs in the drawings of the specification are as follows:

[0028] 1-first shell;11-first bottom surface;12-first side surface;13-second side surface;14-pole;15-liquid injection hole;2-second shell;21-second bottom surface;22-third side surface;23-fourth side surface;3-protrusion;31-first protrusion;32-second protrusion;4-groove;41-first groove;42-second groove. DETAILED DESCRIPTION

[0029] In order to make the technical problems, technical schemes and beneficial effects solved by the utility model more clearly understood, the utility model is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model, and are not used to limit the utility model.

[0030] In the description of the utility model, it should be understood that the orientation or position relationship indicated by the terms "longitudinal", "radial", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the utility model. The device or element indicated must have a particular orientation, a particular orientation and operation, and therefore cannot be understood as limiting the utility model. In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0031] In the description of the utility model, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected;It can be mechanically connected, or it can be electrically connected;It can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0032] As Figures 1-3 shown, in an embodiment, the utility model provides a battery shell, including first shell 1 and second shell 2, first shell 1 and second shell 2 are hollow structure of one end opening, the opening end of first shell 1 is used to connect with the opening end of second shell 2, the opening end of first shell 1 is provided with at least one protruding 3, the opening end of second shell 2 is provided with at least one recess 4, when protruding 3 is embedded in recess 4, the opening end of first shell 1 is sealedly connected with the opening end of second shell 2.

[0033] Specifically, the application is by setting protruding 3 on the opening end of first shell 1, setting recess 4 on the opening end of second shell 2, by embedding protruding 3 in recess 4, it is favorable for the positioning of first shell 1 and second shell 2, makes steel shell fit more closely, facilitates laser welding.

[0034] Moreover, the application adopts the design of protruding 3 embedding recess 4, solves the problem of insufficient depth of stainless steel shell, can satisfy the use of thick electric core, and the design of protruding 3 embedding recess 4 avoids the welding failure problem caused by the poor profile of steel shell and the misalignment of the opening end of first shell 1 and second shell 2, and the effective combination of first shell 1 and second shell 2 through protruding 3 and recess 4 guarantees the effectiveness of welding of first shell 1 and second shell 2 and the safety of electric core.

[0035] As Figure 2 shown, in an embodiment, first shell 1 is rectangular shell, first shell 1 includes first bottom surface 11, two first side surfaces 12 and two second side surfaces 13, two first side surfaces 12 and two second side surfaces 13 are alternately arranged, and are enclosed to form first frame, one end of first frame is connected with four edges of first bottom surface 11 respectively, the other end of first frame is first opening end, and first opening end of first frame is provided with a plurality of protrusions 3.

[0036] Specifically, first opening end of first frame is provided with at least 1 protrusion 3, and each protrusion 3 is located at one side of two first side surfaces 12 at first opening end.

[0037] Further, first opening end of first frame is provided with at least 4 protrusions 3, and the four protrusions 3 are respectively located at one side of two first side surfaces 12 at first opening end and one side of two second side surfaces 13 at first opening end.

[0038] First shell 1 and second shell 2 are combined through a plurality of protrusions 3 and a plurality of recesses 4, so that the opening ends of first shell 1 and second shell 2 are effectively aligned, and the effectiveness of welding of first shell 1 and second shell 2 and the safety of electric core are guaranteed.

[0039] As shown in the drawings, in an embodiment, the protrusions 3 include first protrusions 31 and second protrusions 32, and at least one first protrusion 31 is arranged on each side of the first side face 12 at the first open end; at least one second protrusion 32 is arranged on each side of the second side face 13 at the first open end. Figure 2

[0040] Specifically, the first protrusions 31 and the second protrusions 32 can be square or rectangular structures, when one first protrusion 31 is arranged on the first side face 12 at the first open end, the central axis of the first protrusion 31 coincides with the central axis of the first side face 12; when multiple first protrusions 31 are arranged on the first side face 12 at the first open end, the multiple first protrusions 31 are evenly arranged on the first side face 12 at the first open end, and the two first protrusions 31 at both ends do not coincide with the two ends of the first side face 12.

[0041] When one second protrusion 32 is arranged on the second side face 13 at the first open end, the central axis of the second protrusion 32 coincides with the central axis of the second side face 13; when multiple second protrusions 32 are arranged on the second side face 13 at the first open end, the multiple second protrusions 32 are evenly arranged on the second side face 13 at the first open end, and the two second protrusions 32 at both ends do not coincide with the two ends of the second side face 13, thereby reducing the welding difficulty.

[0042] The first shell 1 and the second shell 2 of the present application are combined by the multiple protrusions 3 and the multiple grooves 4, so that the open ends of the first shell 1 and the second shell 2 are effectively aligned, thereby ensuring the effectiveness of the welding of the first shell 1 and the second shell 2 and the safety of the battery cell.

[0043] As shown in the drawings, in an embodiment, the length direction of the first side face 12, the second side face 13, the first protrusion 31 and the second protrusion 32 is parallel to the direction in which the first bottom face 11 lies; the length of the first side face 12 is L1, the length of the second side face 13 is L2, the length of the first protrusion 31 is L3, and the length of the second protrusion 32 is L4, L1 and L3 satisfy the relationship: 1 / 3≤L3 / L1≤2 / 3, and L2 and L4 satisfy the relationship: 1 / 3≤L4 / L2≤2 / 3. Figure 4 Specifically, L1 and L3 satisfy the relationship: the value of L3 / L1 is any one value or a range value composed of any two values in 1 / 3, 5 / 12, 1 / 2, 7 / 12, 2 / 3. In a preferred embodiment, L1 and L3 satisfy the relationship: 5 / 12≤L3 / L1≤7 / 12.

[0044]

[0045] ​​When L1 and L3 satisfy the relationship: 1 / 3≤L3 / L1≤2 / 3, the first shell 1 and the second shell 2 can be quickly positioned, and the welding strength between the first shell 1 and the second shell 2 can be ensured.

[0046] Specifically, L2 and L4 satisfy the relationship: the value of L4 / L2 is any one value or a range value composed of any two values in 1 / 3, 5 / 12, 1 / 2, 7 / 12, 2 / 3. In a preferred embodiment, L2 and L4 satisfy the relationship: 5 / 12≤L4 / L2≤7 / 12.

[0047] When L2 and L4 satisfy the relationship: 1 / 3≤L4 / L2≤2 / 3, the first shell 1 and the second shell 2 can be quickly positioned, and the welding strength between the first shell 1 and the second shell 2 can be ensured.

[0048] As shown in FIG. 1, Figure 4 In an embodiment, the width direction of the first side surface 12, the second side surface 13, the first protrusion 31 and the second protrusion 32 is perpendicular to the first bottom surface 11; the width of the first side surface 12 is W1, the width of the second side surface 13 is W2, the width of the first protrusion 31 is W3, and the width of the second protrusion 32 is W4; W1 and W3 satisfy the relationship: 1 / 3≤W3 / W1≤2 / 3, and W2 and W4 satisfy the relationship: 1 / 3≤W4 / W2≤2 / 3.

[0049] Specifically, W1 and W3 satisfy the relationship: the value of W3 / W1 is any one value or a range value composed of any two values in 1 / 3, 5 / 12, 1 / 2, 7 / 12, 2 / 3. In a preferred embodiment, W1 and W3 satisfy the relationship: 5 / 12≤W3 / W1≤7 / 12.

[0050] When W1 and W3 satisfy the relationship: 1 / 3≤W3 / W1≤2 / 3, the first shell 1 and the second shell 2 can be quickly positioned, and the welding strength between the first shell 1 and the second shell 2 can be ensured.

[0051] Specifically, W2 and W4 satisfy the relationship: the value of W4 / W2 is any one value or a range value composed of any two values in 1 / 3, 5 / 12, 1 / 2, 7 / 12, 2 / 3. In a preferred embodiment, W2 and W4 satisfy the relationship: 5 / 12≤W4 / W2≤7 / 12.

[0052] When W2 and W4 satisfy the relationship: 1 / 3≤W4 / W2≤2 / 3, the first shell 1 and the second shell 2 can be quickly positioned, and the welding strength between the first shell 1 and the second shell 2 can be ensured.

[0053] As shown in FIG. 1, Figure 3As shown, in an embodiment, the second shell 2 is a rectangular shell, the second shell 2 comprises a second bottom surface 21, two third side surfaces 22 and two fourth side surfaces 23, the two third side surfaces 22 and the two fourth side surfaces 23 are arranged alternately to form a second frame body, one end of the second frame body is connected with four edges of the second bottom surface 21 respectively, and the other end of the second frame body is a second opening end, and the second opening end of the second frame body is provided with a plurality of grooves 4.

[0054] Specifically, the second opening end of the second frame body is provided with at least one groove 4, and two grooves 4 are respectively located on one side of the two third side surfaces 22 at the second opening end; and the other two grooves 4 are respectively located on one side of the two fourth side surfaces 23 at the second opening end.

[0055] Further, the second opening end of the second frame body is provided with four grooves 4, and the four grooves 4 are respectively located on one side of the two third side surfaces 22 at the second opening end and one side of the two fourth side surfaces 23 at the second opening end.

[0056] The first shell 1 and the second shell 2 are combined by the plurality of protrusions 3 and the plurality of grooves 4, so that the opening ends of the first shell 1 and the second shell 2 are effectively aligned, and the effectiveness of welding the first shell 1 and the second shell 2 and the safety of the battery cell are ensured.

[0057] As shown, Figure 3 In an embodiment, the groove 4 comprises a first groove 41 and a second groove 42, and at least one first groove 41 is arranged on one side of the two third side surfaces 22 at the second opening end; and at least one second groove 42 is arranged on one side of the two fourth side surfaces 23 at the second opening end.

[0058] Specifically, the first groove 41 and the second groove 42 can be square or rectangular structures, when one first groove 41 is arranged on one side of the third side surface 22 at the second opening end, the central axis of the first groove 41 coincides with the central axis of the third side surface 22; when a plurality of first grooves 41 are arranged on one side of the third side surface 22 at the second opening end, the plurality of first grooves 41 are arranged uniformly on one side of the third side surface 22 at the second opening end, and the two first grooves 41 located at both ends do not coincide with the two ends of the third side surface 22.

[0059] When one second groove 42 is arranged on one side of the fourth side surface 23 at the second opening end, the central axis of the second groove 42 coincides with the central axis of the fourth side surface 23; when a plurality of second grooves 42 are arranged on one side of the fourth side surface 23 at the second opening end, the plurality of second grooves 42 are arranged uniformly on one side of the fourth side surface 23 at the second opening end, and the two second grooves 42 located at both ends do not coincide with the two ends of the fourth side surface 23, thereby reducing the welding difficulty.

[0060] The first shell 1 and the second shell 2 of the application are combined by the plurality of protrusions 3 and the plurality of grooves 4, so that the opening ends of the first shell 1 and the second shell 2 are effectively aligned, and the effectiveness of welding the first shell 1 and the second shell 2 and the safety of the battery cell are ensured.

[0061] The width of the contact surface of the protrusion 3 and the groove 4 is the shell thickness of the first shell 1 or the second shell 2, and the laser is welded in the vertical direction or any suitable angle of the contact surface of the first opening end and the second opening end during welding; the laser is welded in the vertical direction or any suitable angle of the contact surface of the protrusion 3 and the groove 4.

[0062] The battery shell structure of the application has simple design and is easy to process; and the flange and various cladding designs are not required, which reduces the size and weight of the shell and saves cost.

[0063] As shown in Figure 5 In an embodiment, the length direction of the first groove 41 and the second groove 42 is along the direction parallel to the second bottom surface 21; the length of the first groove 41 is L5, the length of the second groove 42 is L6, and L5 and L3 satisfy the relationship: 0

[0064] When the thickness of the first shell 1 and the second shell 2 is 0.2mm, L5 and L3 satisfy the relationship: 0

[0065] When the thickness of the first shell 1 and the second shell 2 is 0.2mm, L6 and L4 satisfy the relationship: 0

[0066] As shown in Figure 5 In an embodiment, the width direction of the first groove 41 and the second groove 42 is perpendicular to the second bottom surface 21; the width of the first groove 41 is W5, the width of the second groove 42 is W6, W5 and W3 satisfy the relationship: |W5-W3|≤0.075mm, and W6 and W4 satisfy the relationship: |W6-W4|≤0.075mm.

[0067] When the thickness of the first shell 1 and the second shell 2 is 0.2mm, W5 and W3 satisfy the relationship: |W5-W3|≤0.075mm, which is convenient for the quick engagement of the protrusion 3 with the groove 4, the quick positioning of the first shell 1 and the second shell 2, and the guarantee of the sealing performance and the welding strength between the first shell 1 and the second shell 2 during welding.

[0068] When the thickness of the first shell 1 and the second shell 2 is 0.2mm, W6 and W4 satisfy the relationship: |W6-W4|≤0.075mm, which is convenient for the quick engagement of the protrusion 3 with the groove 4, the quick positioning of the first shell 1 and the second shell 2, and the guarantee of the sealing performance and the welding strength between the first shell 1 and the second shell 2 during welding.

[0069] As shown in the drawings, Figures 1-2 The pole 14 and the liquid injection hole 15 are arranged on the first shell 1.

[0070] Specifically, since the groove 4 is arranged on the second shell 2, when the height of the second shell 2 is the same as the height of the first shell 1 in the height direction of the battery shell, the side area of the first shell 1 is larger than the side area of the second shell 2, so the pole 14 and the liquid injection hole 15 are arranged on the first shell 1, which is more convenient to operate.

[0071] Further, the pole 14 and the liquid injection hole 15 can be arranged on the same first side 12 or second side 13; or one of the pole 14 and the liquid injection hole 15 is arranged on one of the first side 12 or the second side 13, and the other of the pole 14 and the liquid injection hole 15 is arranged on the other of the first side 12 or the second side 13; or the pole 14 and the liquid injection hole 15 are arranged on two first sides 12 or two second sides 13 respectively.

[0072] In an embodiment, the utility model further provides a battery which comprises a battery shell and an electric core.

[0073] Specifically, the electric core is arranged in the first shell 1 first, the positive pole lug on the electric core is electrically connected with the pole 14 on the first shell 1, and the negative pole lug on the electric core is welded on the shell wall of the first shell 1, then the first shell 1 and the second shell 2 are combined through the plurality of protrusions 3 and the plurality of grooves 4, the opening ends of the first shell 1 and the second shell 2 are aligned, and welding is performed to obtain a steel shell battery.

[0074] The above merely describes the preferred embodiments of the utility model and is not intended to limit the utility model, and any modification, equivalent replacement and improvement made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A battery casing, characterized in that: The device includes a first housing and a second housing, both of which are hollow structures with one open end. The open end of the first housing is used to connect with the open end of the second housing. At least one protrusion is provided on the open end of the first housing, and at least one groove is provided on the open end of the second housing. When the protrusion is embedded in the groove, the open end of the first housing and the open end of the second housing are sealed together.

2. The battery casing according to claim 1, characterized in that: The first housing is a rectangular housing, which includes a first bottom surface, two first side surfaces and two second side surfaces. The two first side surfaces and the two second side surfaces are arranged alternately to form a first frame. One end of the first frame is connected to the four sides of the first bottom surface, and the other end of the first frame is a first open end. The first open end of the first frame is provided with multiple protrusions.

3. The battery casing according to claim 2, characterized in that: The protrusion includes a first protrusion and a second protrusion. At least one first protrusion is provided on each of the two first sides located on one side of the first opening end; at least one second protrusion is provided on each of the two second sides located on one side of the first opening end.

4. The battery casing according to claim 3, characterized in that: The length directions of the first side surface, the second side surface, the first protrusion, and the second protrusion are parallel to the first bottom surface. The length of the first side surface is L1, the length of the second side surface is L2, the length of the first protrusion is L3, and the length of the second protrusion is L4. The relationship between L1 and L3 is: 1 / 3 ≤ L3 / L1 ≤ 2 / 3, and the relationship between L2 and L4 is: 1 / 3 ≤ L4 / L2 ≤ 2 / 3.

5. The battery casing according to claim 4, characterized in that: The direction perpendicular to the first bottom surface is the width direction of the first side surface, the second side surface, the first protrusion, and the second protrusion; the width of the first side surface is W1, the width of the second side surface is W2, the width of the first protrusion is W3, and the width of the second protrusion is W4. The relationship between W1 and W3 is: 1 / 3 ≤ W3 / W1 ≤ 2 / 3, and the relationship between W2 and W4 is: 1 / 3 ≤ W4 / W2 ≤ 2 / 3.

6. The battery casing according to claim 5, characterized in that: The second housing is a rectangular housing, which includes a second bottom surface, two third side surfaces and two fourth side surfaces. The two third side surfaces and the two fourth side surfaces are arranged alternately to form a second frame. One end of the second frame is connected to the four sides of the second bottom surface, and the other end of the second frame is a second opening end. The second opening end of the second frame is provided with multiple grooves.

7. The battery casing according to claim 6, characterized in that: The groove includes a first groove and a second groove, and at least one first groove is provided on one side of each of the two third sides located at the second opening end; at least one second groove is provided on one side of each of the two fourth sides located at the second opening end.

8. The battery casing according to claim 7, characterized in that: The direction parallel to the second bottom surface is the length direction of the first groove and the second groove; the length of the first groove is L5, the length of the second groove is L6, and L5 and L3 satisfy the relationship: 0 < L5 - L3 ≤ 0.15 mm; L6 and L4 satisfy the relationship: 0 < L6 - L4 ≤ 0.15 mm.

9. The battery casing according to claim 7, characterized in that: The direction perpendicular to the second bottom surface is the width direction of the first groove and the second groove; the width of the first groove is W5, the width of the second groove is W6, the W5 and the W3 satisfy the relationship: |W5-W3|≤0.075, in mm, the W6 and the W4 satisfy the relationship: |W6-W4|≤0.075, in mm.

10. The battery casing according to claim 1, characterized in that: It also includes an electrode post and an injection port, both of which are disposed on the first housing.

11. A battery, characterized in that: It includes a battery cell and a battery casing as described in any one of claims 1-10, wherein the battery cell is disposed within the battery casing.

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