Battery shell, battery monomer and electric equipment

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery shell, a battery monomer and electric equipment. The battery shell comprises a shell body, the shell body comprises two first side walls which are oppositely arranged along a first direction, and the first direction is the thickness direction of the battery shell; the first side wall comprises a main body area and an extension area, at least one end of the main body area in the second direction is connected with the extension area, and the second direction is perpendicular to the first direction; the second direction is the height direction of the battery shell, and the extension rate of the extension area is greater than that of the main body area. The battery shell can accommodate the volume of the deformed edge of the battery cell, more expansion space is provided for the battery cell, the extrusion force on the edge of the battery shell is reduced, and the use safety and reliability of the battery shell and the battery using the battery shell are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery housing, a battery cell and an electrical device. Background Art

[0002] With the increasing requirements for energy density in new energy vehicles, the application of silicon-containing materials is becoming more and more widespread. However, due to the large volume expansion rate of silicon-containing materials, the volume change rate of the battery core during the lithium insertion / lithium extraction process of the battery is as high as 280-400%, which will cause the volume of the battery cell to expand too much in the later stage of cycling, resulting in too much pressure on the battery housing, and the pressure may even exceed 20,000 N. This will not only cause the battery to experience accelerated cycle attenuation due to excessive expansion force, but also cause the phenomenon of shell damage and liquid leakage, leading to safety risks.

[0003] The existing square lithium-ion battery expands outward in a convex shape after expansion. The conventional battery housing design makes the middle part of the battery have a larger space for the battery core to expand, but the edge of the battery core is restricted by the edge of the battery housing and cannot expand, resulting in greater stress on the battery core at this place, and the phenomenon of cycle diving occurs. And in the later stage of battery cycling, the stress on the battery core and the battery housing becomes greater and greater, which may cause damage and liquid leakage at the edge of the battery housing, resulting in safety accidents.

[0004] Therefore, there is an urgent need to provide a new type of battery housing, battery cell and electrical device to solve the above technical problems in the prior art. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a battery housing, which can reduce the extrusion force received at the edge of the battery housing, provide more expansion space for the battery core, and improve the use safety and reliability of the battery housing and the battery using the battery housing.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The battery housing includes a housing body. The housing body includes two first side walls oppositely arranged in a first direction, and the first direction is the thickness direction of the battery housing; the first side wall includes a main body area and an extension area, at least one end of the main body area in a second direction is connected with the extension area, and the second direction is perpendicular to the first direction; the second direction is the height direction of the battery housing, and the extension rate of the extension area is greater than the extension rate of the main body area.

[0008] Optionally, there are two extension areas, and the two extension areas are respectively arranged at both ends of the main body area in the second direction; the length of the extension area in the second direction is L, and 5 mm ≤ L ≤ 30 mm.

[0009] Optionally, the above-mentioned housing body includes a top wall and a bottom wall oppositely arranged in the second direction. The above-mentioned first side wall further includes a first connection area connected to the above-mentioned top wall and a second connection area connected to the above-mentioned bottom wall. One end of the main body area in the second direction is connected to the above-mentioned first connection area through an extension area; the other end of the main body area in the second direction is connected to the above-mentioned second connection area through an extension area.

[0010] Optionally, a plurality of indentations are provided on the inner wall surface of the above-mentioned extension area.

[0011] Optionally, the thickness of the above-mentioned main body area is D1, and the depth of the above-mentioned indentation is D2, where 0.2*D1 ≤ D2 ≤ 0.6*D1.

[0012] Optionally, the total area of the orthographic projections of a plurality of the above-mentioned indentations on the projection plane is S1, and the area of the inner wall surface of the above-mentioned extension area on the projection plane is S2. The above-mentioned projection plane is parallel to the inner wall surface of the above-mentioned extension area, and the relationship is satisfied: 0.3*S2 ≤ S1 ≤ 0.7*S2.

[0013] Optionally, a plurality of the above-mentioned indentations are distributed in a rectangular array along the second direction and the third direction, and the second direction and the third direction are perpendicular to each other; the length of the indentation along the second direction is B1, the length of the extension area along the second direction is L, the width of the indentation along the third direction is C1, and the width of the extension area along the third direction is C2. The relationship is satisfied: 0.4*L ≤ A1*B1 ≤ 0.8*L, 0.4*C2 ≤ A2*C1 ≤ 0.8*C2, where A1 is the number of columns of the indentations arranged along the second direction, and A2 is the number of rows of the indentations arranged along the third direction.

[0014] Optionally, the cross-sectional shape of the above-mentioned indentation is any one of a circle, a square, a rectangle, a triangle, and a wedge.

[0015] Another object of the present invention is to provide a battery cell, which includes the battery housing as described in any of the above solutions. The battery cell uses the above-mentioned battery housing to accommodate the battery core, can provide a larger expansion space for the battery core, reduce the extrusion force at the edges of the battery core and the battery housing, prevent leakage of liquid after the battery housing is squeezed and damaged, and improve the use safety and reliability of the battery cell.

[0016] Another object of the present invention is to provide an electrical device, which includes the battery cell as described in the above solution. The electrical device uses the battery cell described in the above solution for power supply, can improve the use safety and reliability of the battery cell, and further improve the use safety and reliability of the electrical device.

[0017] Beneficial effects:

[0018] The battery housing in this utility model includes a housing body. The housing body is provided with two first side walls oppositely arranged along a first direction. The first side wall includes a main body area and an extension area. The extension area is arranged at at least one end of the main body area along a second direction, and the extension rate of the extension area is greater than that of the main body area. When the battery cell inside the battery monomer is in use, it will expand. Due to the relatively large extension rate of the extension area, when the battery cell expands, it not only bulges and deforms outward in the main body area of the first side wall, but also can squeeze the extension area, causing the extension area to deform, so as to accommodate the deformed volume at the edge of the battery cell, provide more expansion space for the battery cell, reduce the extrusion force received at the edge of the battery housing, and improve the use safety and reliability of the battery housing and the battery using this battery housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is an axonometric view of the battery monomer provided by the specific embodiment of this utility model;

[0020] Figure 2 is a longitudinal sectional view of the battery monomer provided by the specific embodiment of this utility model;

[0021] Figure 3 is a longitudinal sectional view of the first side wall provided by the specific embodiment of this utility model;

[0022] Figure 4 is a top view of the first side wall in Embodiment 1 provided by the specific embodiment of this utility model;

[0023] Figure 5 is a top view of the first side wall in Embodiment 2 provided by the specific embodiment of this utility model;

[0024] Figure 6 is a top view of the first side wall in Embodiment 3 provided by the specific embodiment of this utility model;

[0025] Figure 7 is a top view of the first side wall in Embodiment 4 provided by the specific embodiment of this utility model;

[0026] Figure 8 is a top view of the first side wall in Embodiment 5 provided by the specific embodiment of this utility model.

[0027] In the figures:

[0028] 110, bottom wall; 101, main body area; 102, extension area; 103, first connection area; 104, second connection area; 1021, indentation; 120, first side wall; 130, second side wall;

[0029] 200, top wall; 210, pole post. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the convenience of description, only the parts related to the present utility model rather than all the structures are shown in the drawings.

[0031] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0032] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "above", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below", and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than that of the second feature.

[0033] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0034] The first direction described in this specific embodiment is Figure 1 and Figure 2 the X direction shown in Figure 1 , Figures 4 to 8 , that is, the thickness direction of the battery housing; the second direction is Figures 1 to 8 the Y direction in

[0035] Please refer to Figure 1 andFigure 2 , in this specific embodiment, the battery housing includes a housing body. The housing body includes two first side walls 120 oppositely arranged in a first direction, and the first direction is the thickness direction of the battery housing; the first side walls 120 include a main body area 101 and an extension area 102. At least one end of the main body area 101 in a second direction is connected to the extension area 102, and the second direction is perpendicular to the first direction; the second direction is the height direction of the battery housing, and the extension rate of the extension area 102 is greater than that of the main body area 101.

[0036] The battery housing in this specific embodiment includes a housing body. Two first side walls 120 are oppositely arranged along the first direction on the housing body. The first side walls 120 include a main body area 101 and an extension area 102. The extension area 102 is arranged at least at one end of the main body area 101 along the second direction, and the extension rate of the extension area 102 is greater than that of the main body area 101; when the battery cell inside the battery monomer is in use, it will expand. Since the extension rate of the extension area 102 is relatively large, when the battery cell expands, it not only protrudes and deforms outward in the main body area 101 of the first side wall 120, but also can squeeze the extension area 102, causing the extension area 102 to deform, so as to accommodate the volume after deformation at the edge of the battery cell, provide more expansion space for the battery cell, reduce the extrusion force received at the edges of the battery housing, and improve the use safety and reliability of the battery housing and the battery using the battery housing.

[0037] Further, there are two extension areas 102, and the two extension areas 102 are respectively arranged at both ends of the main body area 101 in the second direction; the length of the extension area 102 along the second direction is L, and 5mm ≤ L ≤ 30mm. The extension areas 102 are respectively arranged at the upper and lower ends of the main body area 101 along the second direction, so that the battery cell can expand at both the upper and lower ends of the first side wall 120 and be accommodated after being extended and deformed by the extension areas 102, thereby reducing the extrusion force at the upper and lower edges of the first side wall 120 along the second direction, and further improving the use safety and reliability of the battery housing.

[0038] Optionally, the above-mentioned housing body includes a top wall 200 and a bottom wall 110 that are oppositely arranged in the second direction. The above-mentioned first side wall 120 further includes a first connection area 103 connected to the above-mentioned top wall 200 and a second connection area 104 connected to the above-mentioned bottom wall 110. One end of the main body area 101 in the second direction is connected to the first connection area 103 through the extension area 102; the other end of the main body area 101 in the second direction is connected to the second connection area 104 through the extension area 102. Since the main body area 101 is not directly connected to the top wall 200 and the bottom wall 110 of the housing body through the extension area 102, not only can the extension area 102 be used to accommodate the volume after the expansion of the battery cell, but also the extension area 102 can be avoided from being directly arranged at the edge of the housing body, preventing the edge of the housing body from deforming, improving the mechanical strength of the edge, and avoiding the edge of the battery housing from being damaged by extrusion after the pressure increases due to the expansion of the battery cell, further improving the safety of use of the battery housing.

[0039] In this specific embodiment, the housing body further includes two second side walls 130 that are oppositely arranged in the third direction. The two first side walls 120 and the two second side walls 130 surround the bottom wall 110 to form a housing body with an opening, and the top wall 200 is fitted and installed at the opening of the housing body to form the battery housing in this specific embodiment; that is, the first side wall 120 is the large surface of the battery housing, and the second side wall 130 is the small surface of the battery housing. The top wall 200 is also provided with the pole column 210, explosion-proof valve, liquid injection hole, etc. of the battery cell, which will not be elaborated here.

[0040] As Figure 3 shown, a plurality of indentations 1021 are provided on the inner wall surface of the above-mentioned extension area 102. That is, the main body area 101 and the extension area 102 are integrally made of a profile. In order to make the elongation rate of the extension area 102 greater than that of the main body area 101, a plurality of indentations 1021 are provided in the extension area 102, thereby reducing the mechanical strength of the extension area 102 and increasing the elongation rate of the extension area 102. Its structure is simpler and can reduce production costs.

[0041] Specifically in this specific embodiment, the thickness of the above-mentioned main body area 101 is D1, and the depth of the above-mentioned indentation 1021 is D2, where 0.2*D1 ≤ D2 ≤ 0.6*D1. Such a depth setting of the indentation 1021 can not only make the elongation rate of the extension area 102 greater than that of the main body area 101, so as to accommodate the deformed volume at the edge of the battery cell, but also ensure that the mechanical strength of the extension area 102 is sufficient to accommodate the battery cell, avoiding the extension area 102 from cracking due to the expansion of the battery cell, further improving the safety and reliability of use of the battery housing. The thickness of the main body area 101 and the depth of the indentation 1021 can be selected and set according to specific requirements, and no specific limitation is made here.

[0042] AsFigure 4 As shown, in this specific embodiment, the total area of the positive projections of several of the above-mentioned indentations 1021 on the projection plane is S1, the area of the inner wall surface of the above-mentioned extension area 102 on the projection plane is S2, the above-mentioned projection plane and the inner wall surface of the above-mentioned extension area 102 are arranged in parallel, and the relational expression is satisfied: 0.3*S2 ≤ S1 ≤ 0.7*S2. The total area of the indentations 1021 provided in the extension area 102 is 0.3 times to 0.7 times the area of the extension area 102. While increasing the extension rate of the extension area 102, it is ensured that the mechanical strength of the extension area 102 will not be reduced too much, and it is sufficient to support and accommodate the increased volume and pressure caused by the expansion of the battery cell, so as to ensure the use reliability of the battery housing and the battery cell.

[0043] It should be noted that in order to enable the indentations 1021 to increase the extension rate of the extension area 102, the number, shape, and arrangement of the indentations 1021 can be set according to specific requirements.

[0044] Specifically in this specific embodiment, as Figures 4 to 8 shown, several of the above-mentioned indentations 1021 are arranged in a rectangular array along the second direction and the third direction, and the above-mentioned second direction and the above-mentioned third direction are perpendicular to each other; the length of the indentation 1021 along the second direction is B1, the length of the extension area 102 along the second direction is L, the width of the indentation 1021 along the third direction is C1, and the width of the extension area 102 along the third direction is C2, satisfying the relational expressions: 0.4*L ≤ A1*B1 ≤ 0.8*L, 0.4*C2 ≤ A2*C1 ≤ 0.8*C2, where A1 is the number of columns of the indentations 1021 arranged along the second direction, and A2 is the number of rows of the indentations 1021 arranged along the third direction. As Figure 4 and Figure 6 shown, the indentations 1021 are arranged regularly and form a grid shape; as Figure 5 and Figure 7 shown, the indentations 1021 are arranged irregularly, and two adjacent columns of indentations 1021 along the third direction are staggered; as Figure 8 shown, the indentation 1021 is a through groove extending along the second direction and is arranged along the third direction. The number and width of the indentation 1021 along the second direction and the third direction need to satisfy 0.4*L ≤ A1*B1 ≤ 0.8*L and 0.4*C2 ≤ A2*C1 ≤ 0.8*C2, ensuring that the indentation 1021 can increase the extension rate of the extension area 102, so as to sufficiently accommodate the expansion volume and expansion pressure at the edge of the battery cell, and will not cause the mechanical strength of the extension area 102 to be too small, ensuring that the mechanical strength of the battery housing is not affected and improving the use safety and reliability of the battery housing.

[0045] Optionally, the cross-sectional shape of the indentation 1021 is any one of a circle, a square, a rectangle, a triangle, and a wedge. As Figure 4 and Figure 5 shown, the cross-section of the indentation 1021 is circular; as Figure 6 and Figure 7 shown, the cross-section of the indentation 1021 is square; as Figure 8 shown, the cross-section of the indentation 1021 is rectangular. It should be noted that the cross-section of the indentation 1021 can also be an irregular shape or other polygons, and the cross-sectional shape of the indentation 1021 can be selected according to specific requirements, and will not be described in detail in this specific embodiment.

[0046] This specific embodiment also provides a battery cell, which includes the battery housing described in any of the above solutions. The battery cell uses the above battery housing to accommodate the battery core, can provide a larger expansion space for the battery core, reduce the extrusion force at the edge of the battery core and the battery housing, prevent liquid leakage after the battery housing is squeezed and damaged, and improve the use safety and reliability of the battery cell.

[0047] This specific embodiment further provides an electrical device, which includes the battery cell described in the above solution. The electrical device is powered by the battery cell described in the above solution, can improve the use safety and reliability of the battery cell, and thus improve the use safety and reliability of the electrical device.

[0048] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limiting the embodiments of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments, and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A battery housing, characterized in that: The battery case comprises a shell body, wherein the shell body comprises two first side walls (120) arranged opposite to each other along a first direction, wherein the first direction is the thickness direction of the battery case; the first side wall (120) comprises a main body area (101) and an extension area (102), wherein at least one end of the main body area (101) in a second direction is connected to the extension area (102), and the second direction and the first direction are perpendicular to each other; the second direction is the height direction of the battery case, and the extension rate of the extension area (102) is greater than the extension rate of the main body area (101).

2. The battery housing according to claim 1, characterized in that: Two extension areas (102) are provided, and the two extension areas (102) are respectively provided at two ends of the main area (101) in the second direction; the length of the extension area (102) along the second direction is L, 5mm≤L≤30mm.

3. The battery housing according to claim 1, characterized in that: The shell body comprises a top wall (200) and a bottom wall (110) arranged opposite to each other along a second direction; the first side wall (120) further comprises a first connection area (103) connected to the top wall (200) and a second connection area (104) connected to the bottom wall (110); one end of the main body area (101) in the second direction is connected to the first connection area (103) via an extension area (102); and the other end of the main body area (101) in the second direction is connected to the second connection area (104) via the extension area (102).

4. The battery casing according to any one of claims 1 to 3, characterized in that: The inner wall surface of the extension area (102) is provided with a plurality of indentations (1021).

5. The battery casing according to claim 4, characterized in that: The thickness of the main body region (101) is D1, the depth of the indentation (1021) is D2, and 0.2*D1≤D2≤0.6*D1.

6. The battery casing according to claim 5, characterized in that: The total area of ​​the orthographic projections of the plurality of indentations (1021) on the projection surface is S1, the area of ​​the inner wall surface of the extension area (102) on the projection surface is S2, and the projection surface and the inner wall surface of the extension area (102) are arranged in parallel, satisfying the relationship: 0.3*S2≤S1≤0.7*S2.

7. The battery case according to claim 5, characterized in that: A plurality of the indentations (1021) are distributed in a rectangular array along a second direction and along a third direction, the second direction and the third direction being perpendicular to each other; the length of the indentation (1021) along the second direction is B1, the length of the extension zone (102) along the second direction is L, the width of the indentation (1021) along the third direction is C1, the width of the extension zone (102) along the third direction is C2, satisfying the relationship: 0.4*L≤A1*B1≤0.8*L, 0.4*C2≤A2*C1≤0.8*C2, wherein A1 is the number of columns of the indentations (1021) arranged along the second direction, and A2 is the number of rows of the indentations (1021) arranged along the third direction.

8. The battery casing according to claim 4, characterized in that: The cross-sectional shape of the indentation (1021) is any one of a circle, a square, a rectangle, a triangle and a wedge.

9. A battery cell, characterized in that: The invention comprises a battery casing according to any one of claims 1 to 8.

10. Electrical equipment, characterized in that: Comprising the battery cell as claimed in claim 9.

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