Integrated injection molding battery cell shell, battery cell and battery pack

Abstract

The utility model relates to the technical field of battery manufacturing, in particular to an integrally injection-molded battery cell shell, a battery cell and a battery pack. The integrated injection molding battery cell shell comprises a shell, a first plastic part and a second plastic part, the shell comprises a shell main body and a cover plate, the shell main body is provided with an opening, and the cover plate is arranged at the opening; the first plastic part is injection-molded on one side, deviating from the shell main body, of the cover plate; the second plastic part is formed on the other side of the cover plate in an injection molding manner, the second plastic part is provided with a first lug hole, and a lug shaping unit is arranged on one side, deviating from the cover plate, of the second plastic part and comprises a guide surface. As the first plastic part and the second plastic part are injection-molded on the two sides of the cover plate and are injection-molded into the integrated structure, the manufacturing efficiency is improved. The tab shaping unit plays a role in limiting and fixing the tabs, so that the tabs are better in shape after being folded, and short circuit between the tabs and the electrified core shell caused by poor tab folding shape is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of battery manufacturing, and in particular to a method for manufacturing a battery cell shell, a battery cell shell and a battery pack. Background Art

[0002] Modern society has an increasingly high demand for clean energy, and the market for traditional gasoline, diesel and other fuel vehicles is increasingly impacted by electric vehicles. Electric vehicles use large-capacity power batteries to provide energy. These power batteries can be repeatedly charged and discharged. Among them, lithium batteries have been the most widely used due to their excellent performance.

[0003] The current lithium battery cell generally includes a shell, an electrode group and a cell cover structure. The electrode group is arranged in the shell, and the cell cover structure is covered on the top of the shell to seal the electrode group in the shell. Among them, the cell cover structure is usually assembled from a plain aluminum sheet, an upper plastic, a pole, a rivet block, a lower plastic, etc. After the cell cover structure is covered on the top of the shell, the edge of the plain aluminum sheet is connected to the inner wall of the top of the shell by laser welding. However, the plain aluminum sheet is connected to the upper plastic and the lower plastic by riveting, which is a cumbersome and complicated process and increases the manufacturing cost. In addition, in order to improve the space utilization in the cell shell, the cell shell is provided with a tab hole for the tab to pass through. The tab passes through the tab hole after being folded, but the poor shape of the tab after folding will cause a short circuit.

[0004] Therefore, there is an urgent need for a method for manufacturing a battery cell shell to solve the above technical problems. Utility Model Content

[0005] The purpose of the utility model is to provide a method for manufacturing a battery cell shell, a battery cell shell and a battery pack, which can simplify the assembly process, improve manufacturing efficiency, and avoid short circuits between the tabs and the shell caused by poor tab folding shape.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] In a first aspect, an integrated injection-molded battery cell housing is provided, comprising:

[0008] The housing comprises a housing body and a cover plate, wherein the housing body has an opening and the cover plate is arranged at the opening;

[0009] a first plastic part, injection-molded on a side of the cover plate facing away from the shell body;

[0010] A second plastic part is injection molded on the other side of the cover plate. The second plastic part has a first pole lug hole. A pole lug shaping unit is provided on the side of the second plastic part facing away from the cover plate. The pole lug shaping unit includes a guide surface. The guide surfaces are provided on both sides of the first pole lug hole. From the first pole lug hole toward the long side wall of the second plastic part, the guide surface gradually moves away from the cover plate.

[0011] As a preferred technical solution for the above-mentioned one-piece injection-molded battery cell shell, the first plastic part has a second pole lug hole, and the cover plate has a third pole lug hole. Along the direction perpendicular to the cover plate, the projection of the second pole lug hole on the cover plate, the projection of the first pole lug hole on the cover plate and the third pole lug hole at least partially overlap.

[0012] As a preferred technical solution for the above-mentioned one-piece injection-molded battery cell housing, the cover plate is provided with a groove for accommodating the first plastic part, and the third electrode ear hole is provided at the bottom of the groove.

[0013] As a preferred technical solution for the above-mentioned one-piece injection-molded battery cell shell, the distance between the surface of the flange edge of the first plastic part facing away from the groove and the surface of the cover plate facing away from the second plastic part is h, wherein -0.5H≤h≤H, when the surface of the flange edge does not protrude from the surface of the cover plate, h is a negative number, and the thickness of the cover plate is H.

[0014] As a preferred technical solution for the above-mentioned one-piece injection-molded battery cell housing, the first plastic part has a flange edge, and the width of the flange edge is L, wherein 0<L<10mm.

[0015] As a preferred technical solution for the above-mentioned one-piece injection-molded battery cell housing, the cover plate is further provided with an explosion-proof valve and a liquid injection hole.

[0016] As a preferred technical solution for the above-mentioned integral injection-molded battery cell housing, the explosion-proof valve is formed by a notch provided on the cover plate.

[0017] As a preferred technical solution of the above-mentioned one-piece injection-molded battery cell housing, the housing body is provided with an explosion-proof valve, and the explosion-proof valve and the cover plate are respectively arranged on two opposite sides of the housing body.

[0018] In a second aspect, a battery cell is provided, comprising a core pack and an integral injection-molded battery cell shell as described in any of the above schemes, wherein the core pack is arranged in a cavity formed by the battery cell shell.

[0019] In a third aspect, a battery pack is provided, comprising a box and the battery cell described in the above scheme, wherein the battery cell is arranged in the box.

[0020] The utility model has at least the following beneficial effects:

[0021] The one-piece injection-molded battery cell shell provided by the present invention has the first plastic part and the second plastic part injection-molded on both sides of the cover plate. Compared with the prior art, the first plastic part and the second plastic part can be connected to the cover plate after molding, eliminating the riveting process step, thereby saving manufacturing costs and improving manufacturing efficiency. The tab shaping unit includes a guide surface. Since the guide surface is arranged on both sides of the first tab hole located in the second plastic part, and the guide surface gradually moves away from the cover plate along the first tab hole toward the long side wall of the second plastic part, the guide surface can guide and gather the tab in the process of the tab entering the first tab hole. This can make the tab have a better shape after being folded, protect the tab, and prevent the tab from short-circuiting with the battery cell shell due to poor tab folding shape.

[0022] The present invention also provides a battery cell, comprising a core pack and a battery cell shell provided by the present invention, wherein the core pack is arranged in a cavity formed by the battery cell shell. Since the first plastic part and the second plastic part are injection molded on both sides of the cover plate, compared with the prior art, the first plastic part and the second plastic part can be connected to the cover plate after molding, eliminating the riveting process step, thereby saving manufacturing costs and improving manufacturing efficiency. The tab shaping unit includes a guide surface. Since the guide surface is arranged on both sides of the first tab hole located in the second plastic part, and the guide surface gradually moves away from the cover plate along the first tab hole toward the long side wall of the second plastic part, the guide surface can guide and gather the tab in the process of the tab entering the first tab hole, so that the tab can have a better shape after being folded, protect the tab, and prevent the tab from short-circuiting with the battery cell shell due to poor tab folding shape.

[0023] The present invention also provides a battery pack, comprising a box body and a battery cell provided by the present invention, wherein the battery cell is arranged in the box body. Since the first plastic part and the second plastic part are injection molded on both sides of the cover plate, compared with the prior art, the first plastic part and the second plastic part can be connected to the cover plate after molding, eliminating the riveting process step, thereby saving manufacturing costs and improving manufacturing efficiency. The tab shaping unit includes a guide surface. Since the guide surface is arranged on both sides of the first tab hole located in the second plastic part, and the guide surface gradually moves away from the cover plate along the first tab hole toward the long side wall of the second plastic part, the guide surface can guide and gather the tab in the process of the tab entering the first tab hole, so that the tab can have a better shape after being folded, protect the tab, and prevent the tab from short-circuiting with the battery cell shell due to poor tab folding shape. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0025] Figure 1 A schematic diagram of the structure of a battery cell housing provided in an embodiment of the present utility model;

[0026] Figure 2 An exploded schematic diagram of a battery cell housing provided by an embodiment of the present utility model;

[0027] Figure 3 A schematic structural diagram of a second plastic part provided in an embodiment of the present utility model;

[0028] Figure 4 A top view of a battery cell housing provided in an embodiment of the present utility model;

[0029] Figure 5 for Figure 4 Cross-sectional view at AA in the middle;

[0030] Figure 6 for Figure 4 Cross-sectional view at the middle BB;

[0031] Figure 7 for Figure 6 Cross-sectional view at CC;

[0032] Figure 8 for Figure 6 A partial enlarged view of point D in the middle.

[0033] In the picture:

[0034] 1. Cover plate; 11. Groove; 111. Third pole lug hole; 12. Liquid injection hole; 13. Explosion-proof valve; 2. Shell body; 3. First plastic part; 31. Second pole lug hole; 4. Second plastic part; 41. First pole lug hole; 5. Pole lug shaping unit; 51. Guide surface. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0036] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0037] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0038] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0039] In the prior art, the cover plate structure needs to be riveted to complete the assembly process, resulting in the upper and lower plastic parts being installed on both sides of the bare aluminum sheet after they are manufactured. This increases the assembly steps and leads to increased processing and production costs.

[0040] like Figure 1-8As shown, the battery cell case includes an outer shell, a first plastic part 3, and a second plastic part 4. The outer shell includes a shell body 2 and a cover plate 1. The shell body 2 has an opening, and the cover plate 1 is disposed at the opening. The first plastic part 3 is injection molded on the side of the cover plate 1 facing away from the shell body 2, and the second plastic part 4 is injection molded on the other side of the cover plate 1. The second plastic part 4 has a first tab hole 41. The tab shaping unit 5 includes guide surfaces 51. The guide surfaces 51 are disposed on both sides of the first tab hole 41. The length extension direction of the guide surfaces 51 is the same as the length extension direction of the first tab hole 41. From the first tab hole 41 to the long side wall of the second plastic part 4, the guide surfaces 51 gradually move away from the cover plate 1. That is, the guide surface 51 is arranged obliquely relative to the cover plate 1. Since the guide surfaces 51 are respectively provided on both sides of the first pole ear hole 41, a trumpet-shaped guide space is formed on the side of the first pole ear hole 41 away from the cover plate 1. The guide surface 51 provides guidance for the pole ear and always limits and presses the pole ear after the pole ear is folded, so that the pole ear is always in a folded state to prevent the pole ears from separating from each other.

[0041] The one-piece injection molded battery cell shell provided by the present invention has the first plastic part 3 and the second plastic part 4 injection molded on both sides of the cover plate 1. Compared with the prior art, the first plastic part 3 and the second plastic part 4 can be connected to the cover plate 1 after molding, eliminating the riveting process step, thereby saving manufacturing costs and improving manufacturing efficiency. The tab shaping unit 5 includes a guide surface 51. Since the guide surface 51 is arranged on both sides of the first tab hole 41 located in the second plastic part 4, and the guide surface 51 gradually moves away from the cover plate 1 along the first tab hole 41 toward the long side wall of the second plastic part 4, the guide surface 51 can guide and gather the tabs in the process of the tabs entering the first tab hole 41. This can make the tabs have a better shape after being folded, protect the tabs, and prevent the tabs from short-circuiting with the battery cell shell due to poor tab folding shape.

[0042] The cover plate 1 has a third tab hole 111, and the first plastic part 3 has a second tab hole 31. In a direction perpendicular to the cover plate 1, the projection of the second tab hole 31 on the cover plate 1, the projection of the first tab hole 41 on the cover plate 1, and the third tab hole 111 at least partially overlap. That is, the third tab hole 111, the second tab hole 31, and the first tab hole 41 at least partially overlap. This ensures that the tab can pass through the first tab hole 41, the third tab hole 111, and the second tab hole 31 before connecting to the terminal post. For example, the projection of the second tab hole 31 on the cover plate 1, the projection of the first tab hole 41 on the cover plate 1, and the third tab hole 111 completely overlap. This arrangement facilitates tab insertion, reduces assembly difficulty, and improves assembly efficiency. Furthermore, after the tab passes through the cover plate 1 and connects to the terminal post, compared to the prior art method where the terminal post passes through the cover plate 1 and connects to the tab from within the housing body 2, the space within the housing body 2 is more effectively utilized.

[0043] During the manufacturing process of the one-piece injection-molded battery cell shell, the cover plate 1 is first obtained, and then the first plastic part 3 and the second plastic part 4 are injection-molded on both sides of the cover plate 1 and simultaneously injection-molded into an integrated structure; wherein, when the second plastic part 4 is injection-molded, a tab shaping unit 5 is provided on the side of the second plastic part 4 facing away from the cover plate 1, and the tab shaping unit 5 is formed simultaneously during the injection molding process of the second plastic part 4.

[0044] In some embodiments, the cover plate 1 is obtained by a stamping process. Specifically, the cover plate 1 is a plain aluminum sheet, which can be formed by stamping. The size of the cover plate 1 can be designed according to the specifications of the battery cell. Figure 1-3 As shown, the cover plate 1 is provided with a groove 11, a liquid injection hole 12, an explosion-proof valve 13, and a third electrode tab hole 111. The explosion-proof valve 13 is formed as a notch. The notch can be set toward the first plastic part 3 or the second plastic part 4, and is not specifically limited in this embodiment. The liquid injection hole 12 and the explosion-proof valve 13 are arranged between two grooves 11. There are two grooves 11, and the two grooves 11 are used to install the positive electrode column and the negative electrode column respectively. The bottom of the groove 11 is provided with a third electrode tab hole 111. The electrode tab passes through the third electrode tab hole 111 and is connected to the positive electrode column and the negative electrode column respectively. The groove 11, liquid injection hole 12, explosion-proof valve 13, and third electrode tab hole 111 can be formed by machining.

[0045] Of course, in other embodiments, the explosion-proof valve 13 can also be an explosion-proof disc mounting hole. By installing an explosion-proof disc at the explosion-proof disc mounting hole, the thickness of the explosion-proof disc is less than the thickness of the cover plate 1, so as to form an explosion-proof valve 13. The explosion-proof disc can be installed on either side of the cover plate 1, as long as it can cover the explosion-proof hole. In the illustrated embodiment, the upper part of the explosion-proof disc mounting hole is higher than the upper surface of the cover plate 1, and its upper diameter is smaller than the lower diameter. That is, when viewed from the lower surface of the cover plate 1, the explosion-proof disc mounting hole is a countersunk hole. In other words, the explosion-proof disc is embedded in the lower surface of the cover plate 1. In order to protect the explosion-proof disc, a protective film is affixed to the upper end of the explosion-proof disc mounting hole. The explosion-proof disc will rupture when the pressure in the battery cell exceeds a threshold value (for example, 0.6 MPa) to prevent the square shell battery cell from exploding. The structure of the explosion-proof disc is well known and will not be described here. The explosion-proof disc mounting hole is designed according to the shape of the explosion-proof disc. In the illustrated embodiment, the explosion-proof disc mounting hole is a runway-shaped hole.

[0046] Continue to refer Figure 1-3 The first plastic part 3 is provided with a second tab hole 31. Since the first plastic part 3 is an integral injection-molded structure, the second tab hole 31 is formed simultaneously during the injection molding process. This can eliminate the machining step of obtaining the second tab hole 31, further improving the processing efficiency.

[0047] The second plastic part 4 is provided with a tab shaping unit 5 and a first tab hole 41. The tab shaping unit 5 is arranged on the side of the second plastic part 4 away from the cover plate 1 and is arranged toward the core package. Since the first plastic part 3 is an integrated injection molding structure, the second tab hole 31 and the tab shaping unit 5 are formed simultaneously during the injection molding process.

[0048] Specifically, the number of the tab shaping units 5 and the number of the second tab holes 31 are arranged in a one-to-one correspondence, that is, the number of the tab shaping units 5 can be single or multiple.

[0049] The tabs pass through the first tab hole 41 , the third tab hole 111 and the second tab hole 31 and are folded over the first plastic part 3 , which can improve the internal space utilization of the battery cell. Compared with the prior art, the internal space utilization of the battery cell can be improved.

[0050] If only positive poles or negative poles are designed on the cover plate 1, the number N of the third pole ear holes 111 is ≥1. If a positive pole is set on one side of the cover plate 1 and a negative pole is set on the other side, the number of the third pole ear holes 111 on the positive and negative sides is ≥1, and the pole ears pass through the third pole ear holes 111 and are folded above the energized core shell, which can improve the internal space utilization of the battery.

[0051] In some embodiments, as Figure 5-8 As shown, the cover plate 1 is provided with a groove 11, and the first plastic part 3 is located in the groove 11. The provision of the groove 11 can prevent the first plastic part 3 from protruding too much, thereby increasing the overall height of the energized core housing, thereby improving the volume utilization. The bottom of the groove 11 is provided with a third tab hole 111. Specifically, the distance between the surface of the first plastic part 3 facing away from the flange edge of the groove 11 and the surface of the cover plate 1 facing away from the second plastic part 4 is h, where -0.5H≤h≤H, and the thickness of the cover plate 1 is H. Exemplarily, the distance h is -0.5H, -0.4H, -0.3H, -0.2H, -0.1H, 0, 0.1H, 0.2H, 0.3H, 0.3H, 0.4H, 0.5H, 0.6H, 0.7H, 0.8H, 0.9H, or H, which is not specifically limited here.

[0052] When the distance between the surface of the first plastic part 3 facing away from the groove 11 and the surface of the cover plate 1 facing away from the second plastic part 4 is -0.5H, the surface of the first plastic part 3 facing away from the groove 11 is located within the groove 11 and does not protrude from the groove 11, thereby improving volume utilization. When the distance between the surface of the first plastic part 3 facing away from the groove 11 and the surface of the cover plate 1 facing away from the second plastic part 4 is H, low strength of the energized core housing can be avoided. For example, two second tab holes 31 are spaced apart at the bottom of the groove 11. The length of the second tab holes 31 extends in the same direction as the length of the cover plate 1, thereby ensuring that the tab can pass through completely and smoothly over a longer length.

[0053] In some embodiments, as Figure 5-8 As shown, the first plastic part 3 has a flange edge, and the width of the flange edge is L, where 0 < L < 10 mm. For example, the value of L is 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, or 10 mm, which is not specifically limited here. This configuration can avoid the flange edge being too large, which would increase the weight of the first plastic part 3, increase the material cost, and affect the housing design.

[0054] In some embodiments, as Figure 2 、 Figure 4 and Figure 6 As shown, the cover plate 1 is also provided with an explosion-proof valve 13 and / or a liquid injection hole 12. The explosion-proof valve 13 is formed by a notch provided on the cover plate 1. The notch can be provided on the inner side of the cover plate 1 (the side facing the second plastic part 4) or the outer side (the side facing the first plastic part 3). The liquid injection hole 12 can be provided near the positive electrode column, near the negative electrode column, or between the positive and negative electrode columns.

[0055] In some other embodiments, the cover plate 1 is provided with an explosion-proof disc mounting hole and / or a liquid injection hole 12, and the explosion-proof disc mounting hole is installed with an explosion-proof disc to form an explosion-proof valve 13, wherein the explosion-proof disc can be set on any side of the cover plate 1 as long as the explosion-proof disc mounting hole can be covered.

[0056] The present invention also provides a battery cell, comprising a core pack and a battery cell shell provided by the present invention, wherein the core pack is disposed within a cavity formed by the battery cell shell. Since the first plastic part 3 and the second plastic part 4 are injection molded on both sides of the cover plate 1, compared to the prior art, the first plastic part 3 and the second plastic part 4 can be connected to the cover plate 1 after molding, eliminating the riveting process step, thereby saving manufacturing costs and improving manufacturing efficiency. The tab shaping unit 5 includes a guide surface 51. Since the guide surface 51 is disposed on both sides of the first tab hole 41 located in the second plastic part 4, and the guide surface 51 gradually moves away from the cover plate 1 along the first tab hole 41 toward the long side wall of the second plastic part 4, the guide surface 51 can guide and gather the tab during the process of the tab entering the first tab hole 41. This can improve the tab's shape after folding, protect the tab, and prevent the tab from short-circuiting with the battery cell shell due to poor tab folding.

[0057] The present invention also provides a battery pack, comprising a box and a battery cell provided by the present invention, wherein the battery cell is arranged in the box. Since the first plastic part 3 and the second plastic part 4 are injection molded on both sides of the cover plate 1, compared with the prior art, the first plastic part 3 and the second plastic part 4 can be connected to the cover plate 1 after molding, eliminating the riveting process step, thereby saving manufacturing costs and improving manufacturing efficiency. The tab shaping unit 5 includes a guide surface 51. Since the guide surface 51 is arranged on both sides of the first tab hole 41 located in the second plastic part 4, and the guide surface 51 gradually moves away from the cover plate 1 along the first tab hole 41 toward the long side wall of the second plastic part 4, the guide surface 51 can guide and gather the tab in the process of the tab entering the first tab hole 41, so that the tab can have a better shape after being folded, protect the tab, and prevent the tab from short-circuiting with the battery cell shell due to poor tab folding shape.

[0058] Furthermore, the above are merely preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions are possible for those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the scope of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. An integrated injection molded battery cell housing, characterized in that: include: A housing comprises a housing body (2) and a cover plate (1), wherein the housing body (2) has an opening, and the cover plate (1) is arranged at the opening; A first plastic part (3) is injection-molded on a side of the cover plate (1) facing away from the shell body (2); A second plastic part (4) is injection molded on the other side of the cover plate (1), the second plastic part (4) having a first pole lug hole (41), a pole lug shaping unit (5) being provided on the side of the second plastic part (4) facing away from the cover plate (1), the pole lug shaping unit (5) comprising a guide surface (51), the guide surface (51) being provided on both sides of the first pole lug hole (41), and the guide surface (51) gradually moving away from the cover plate (1) from the first pole lug hole (41) toward the long side wall of the second plastic part (4).

2. The one-piece injection molded battery cell housing according to claim 1, characterized in that: The first plastic part (3) has a second pole lug hole (31), the cover plate (1) has a third pole lug hole (111), and along a direction perpendicular to the cover plate (1), a projection of the second pole lug hole (31) on the cover plate (1), a projection of the first pole lug hole (41) on the cover plate (1), and the third pole lug hole (111) at least partially overlap.

3. The one-piece injection molded battery cell housing according to claim 2, characterized in that: The cover plate (1) is provided with a groove (11) for accommodating the first plastic part (3), and the third tab hole (111) is arranged at the bottom of the groove (11).

4. The one-piece injection molded battery cell housing according to claim 3, characterized in that: The distance between the surface of the flange edge of the first plastic part (3) facing away from the groove (11) and the surface of the cover plate (1) facing away from the second plastic part (4) is h, wherein -0.5H≤h≤H, when the surface of the flange edge does not protrude from the surface of the cover plate (1), h is a negative number, and the thickness of the cover plate (1) is H.

5. The one-piece injection molded battery cell housing according to any one of claims 1 to 4, characterized in that: The first plastic part (3) has a flange edge, and the width of the flange edge is L, wherein 0<L<10mm.

6. The one-piece injection molded battery cell housing according to any one of claims 1 to 4, characterized in that: The cover plate (1) is also provided with an explosion-proof valve (13) and a liquid injection hole (12).

7. The one-piece injection molded battery cell housing according to claim 6, characterized in that: The explosion-proof valve (13) is formed by a notch provided on the cover plate (1).

8. The one-piece injection-molded battery cell housing according to any one of claims 1 to 4, characterized in that: The shell body (2) is provided with an explosion-proof valve (13), and the explosion-proof valve (13) and the cover plate (1) are respectively provided on two opposite sides of the shell body (2).

9. A battery cell, characterized in that: It comprises a core pack and an integral injection-molded battery cell shell according to any one of claims 1 to 8, wherein the core pack is arranged in a cavity formed by the battery cell shell.

10. A battery pack, characterized in that: The invention comprises a box body and the battery cell according to claim 9, wherein the battery cell is arranged in the box body.

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