Split injection-molded battery cell shell, battery cell and battery pack

Abstract

The utility model relates to the technical field of battery manufacturing, in particular to a split injection-molded battery shell, a battery cell and a battery pack. The first plastic part and the second plastic part are formed on the two sides of the cover plate in an injection molding mode respectively, compared with the prior art, the first plastic part and the second plastic part can be connected with the cover plate after being formed, the riveting process step is omitted, the manufacturing cost is further saved, and 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, the tabs are protected, and short circuit between the tabs and the battery shell caused by poor tab folding shape is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of battery manufacturing, in particular to a split injection-molded battery core shell, a battery core 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 by a plain aluminum sheet, an upper plastic, a pole, a riveted block 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 rate 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 split injection molded battery cell shell to solve the above technical problems. Utility Model Content

[0005] The purpose of the present invention is to provide a split injection molded battery cell shell, battery cell and battery pack, which can simplify manufacturing and assembly, improve manufacturing efficiency, and avoid short circuit between the tab 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, the present invention provides a split injection-molded battery housing, comprising:

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

[0009] a first plastic part, injection-molded on a side of the cover plate facing away from the shell body, the first plastic part being provided with a first injection-molded connecting column, the first injection-molded connecting column being embedded in the first injection-molded hole;

[0010] The second plastic part is injection molded on the other side of the cover plate, and a tab shaping unit is provided on the side of the second plastic part facing away from the cover plate.

[0011] As a preferred technical solution of the above-mentioned split injection-molded battery cell housing, the cover plate is further provided with a second injection-molded hole, and the second plastic part is provided with a second injection-molded connecting column, which is embedded in the second injection-molded hole.

[0012] As a preferred technical solution for the above-mentioned split injection-molded battery cell shell, the cover plate has a first pole ear hole, the first plastic part has a second pole ear hole, and the second plastic part has a third pole ear hole. Along the direction perpendicular to the cover plate, the projection of the second pole ear hole on the cover plate, the projection of the third pole ear hole on the cover plate and the first pole ear hole at least partially overlap.

[0013] As an optimal technical solution for the above-mentioned split injection-molded battery cell shell, the tab shaping unit includes a guide surface, which is arranged on both sides of the third tab hole. From the third tab hole toward the long side wall of the second plastic part, the guide surface gradually moves away from the cover plate.

[0014] As a preferred technical solution for the above-mentioned split injection-molded battery cell housing, the cover plate is provided with a groove for accommodating the first plastic part, and the first pole ear hole is arranged at the bottom of the groove.

[0015] As a preferred technical solution for the above-mentioned split injection-molded battery case, 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.

[0016] As a preferred technical solution for the above-mentioned split injection-molded battery housing, the first injection hole is provided at the bottom of the concave groove, and a plurality of first injection holes are provided at the bottom of each groove.

[0017] As a preferred technical solution for the above-mentioned split injection-molded battery housing, the housing body and the cover plate are an integrally molded structure.

[0018] In a second aspect, a battery cell is provided, comprising a core pack and a split 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 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 split-type injection-molded battery cell housing provided by the utility model has a first plastic part and a second plastic part respectively injection-molded on both sides of the cover plate. Compared with the prior art, the first and second plastic parts 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 serves to limit and fix the tab, thereby improving the shape of the tab after folding, protecting the tab, and preventing the tab from short-circuiting with the battery housing due to poor tab folding shape.

[0022] The present invention also provides a battery cell, comprising a core pack and a split injection-molded battery shell provided by the present invention, wherein the core pack is disposed in a chamber formed by the split injection-molded battery shell. A first plastic part and a 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 serves to limit and fix the tab, thereby making the tab better shaped after folding, protecting the tab, and preventing the tab from short-circuiting with the battery shell due to poor folding shape of the tab.

[0023] The present invention also provides a battery pack, comprising a housing and a battery cell provided by the present invention, wherein the battery cell is disposed within the housing. A first plastic part and a second plastic part are injection molded on both sides of the cover plate. Compared to 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 serves to limit and fix the tab, thereby making the tab better shaped after folding, protecting the tab, and preventing the tab from short-circuiting with the battery housing due to poor tab folding. 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 structural diagram of a split injection-molded battery housing provided by an embodiment of the present utility model;

[0026] Figure 2 A schematic diagram of the structure of the first plastic provided in an embodiment of the present utility model;

[0027] Figure 3 This is an exploded schematic diagram of a split injection-molded battery housing provided by an embodiment of the present utility model;

[0028] Figure 4 A schematic structural diagram of a second plastic part provided in an embodiment of the present utility model;

[0029] Figure 5 A top view of a split injection-molded battery housing provided in an embodiment of the present utility model;

[0030] Figure 6 for Figure 5 Cross-sectional view at AA in the middle;

[0031] Figure 7 for Figure 5 Cross-sectional view at the middle BB;

[0032] Figure 8 for Figure 7 Cross-sectional view at CC;

[0033] Figure 9 for Figure 7 A partial enlarged view of point D in the middle.

[0034] In the picture:

[0035] 1. Cover plate; 11. Groove; 111. First pole lug hole; 112. First injection molding hole; 12. Liquid injection hole; 13. Explosion-proof valve; 2. Shell body; 3. First plastic part; 31. Second pole lug hole; 32. First injection molding connecting column; 4. Second plastic part; 41. Third pole lug hole; 42. Second injection molding connecting column; 5. Pole lug shaping unit; 51. Guide surface. DETAILED DESCRIPTION

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] To this end, the embodiment of the present invention provides a split injection molded battery housing, such as Figure 1 and Figure 2 As shown, the split injection-molded battery cell casing 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 2 is arranged at the opening. The cover plate 2 is provided with a first injection hole 112. 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.

[0042] The split-injection-molded battery case is manufactured by split-injection molding a first molded part 3 and a second molded part 4. During the injection molding process, the cover plate 1 is first obtained, and one of the first molded part 3 or the second molded part 4 is injection-molded on one side of the cover plate 1. Then, the other of the first molded part 3 or the second molded part 4 is injection-molded. When the second molded part 4 is injection-molded, a tab shaping unit 5 is provided on the side of the second molded part 4 facing away from the cover plate 1. The tab shaping unit 5 is formed simultaneously during the injection molding process of the second molded part 4. The first molded part 3 is provided with a first injection-molded connecting post 32, which is embedded in the first injection-molded hole 112 to securely connect the first molded part 3 to the housing.

[0043] A first plastic part 3 and a 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 serves to limit and fix the tab, which can improve the shape of the tab after folding, protect the tab, and prevent the tab from shorting with the battery housing due to poor tab folding shape.

[0044] Furthermore, if Figure 3 As shown, the cover plate 1 is further provided with a second injection molding hole, and the second plastic part 4 is provided with a second injection molding connecting post 42. The second injection molding connecting post 42 is embedded in the second injection molding hole to securely connect the second plastic part 4 to the cover plate 1. In addition, the first injection molding hole 112 is provided at the bottom of the groove 11, and each groove 11 is provided with multiple first injection molding holes 112 at the bottom. The multiple first injection molding holes 112 can ensure that the first plastic part 3 is firmly fixed, reducing the risk of the first plastic part 3 being separated from the housing.

[0045] 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 3-5 As shown, the cover plate 1 is provided with a groove 11, a liquid injection hole 12, an explosion-proof valve 13, and a first electrode tab hole 111. The explosion-proof valve 13 is formed by 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 first electrode tab hole 111. The electrode tab passes through the first 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 first electrode tab hole 111 can be formed by machining.

[0046] 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.

[0047] In some embodiments, the process further includes obtaining a shell body 2 having an opening, and installing the cover plate 1 obtained by injection molding at the opening of the shell body 2 .

[0048] In other embodiments, the cover plate 1 and the shell body 2 are integrally formed. Thus, during injection molding, the first plastic part 3 and the second plastic part 4 are injection molded onto the inner and outer walls of the shell, respectively.

[0049] Continue to refer Figure 3-5 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.

[0050] The second plastic part 4 is provided with a tab shaping unit 5 and a third 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.

[0051] In some embodiments, the cover plate 1 has a first tab hole 111, the first plastic part 3 has a second tab hole 31, and the second plastic part 4 has a third tab hole 41. Along 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 third tab hole 41 on the cover plate 1, and the first tab hole 111 at least partially overlap. That is, the first tab hole 111, the second tab hole 31, and the third tab hole 41 at least partially overlap. This ensures that the tab can pass through the third tab hole 41, the first tab hole 111, and the second tab hole 31 and then connect to the terminal. Exemplarily, the projection of the second tab hole 31 on the cover plate 1, the projection of the third tab hole 41 on the cover plate 1, and the first tab hole 111 completely overlap. This arrangement facilitates tab insertion, reduces assembly difficulty, and improves assembly efficiency. In addition, the tab is connected to the pole after passing through the cover plate 1. Compared with the prior art in which the pole passes through the cover plate 1 and is connected to the tab from inside the shell body 2, the space inside the shell body 2 can be effectively utilized.

[0052] 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.

[0053] Furthermore, if Figure 8As shown, the tab shaping unit 5 includes guide surfaces 51, which are disposed on either side of the third tab hole 41. The guide surfaces 51 extend in the same direction as the third tab hole 41, gradually moving away from the cover plate 1 from the third tab hole 41 toward the long sidewall of the second plastic part 4. That is, the guide surfaces 51 are arranged at an angle relative to the cover plate 1. Because the guide surfaces 51 are disposed on either side of the third tab hole 41, a trumpet-shaped guide space is formed on the side of the third tab hole 41 facing away from the cover plate 1. The guide surfaces 51 provide guidance for the tabs and, after the tabs are retracted, constantly limit and suppress the tabs, thereby keeping the tabs in a retracted state and preventing separation between the tabs.

[0054] The tab passes through the third tab hole 41 , the first tab hole 111 and the second tab hole 31 and is 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.

[0055] If only positive electrode posts or negative electrode posts are designed on the cover plate 1, the number N of the first tab holes 111 is ≥1. If a positive electrode post is provided on one side of the cover plate 1 and a negative electrode post is provided on the other side, the number of the first tab holes 111 provided on the positive and negative sides is ≥1, and the tabs passing through the first tab holes 111 are folded over the battery shell, which can improve the internal space utilization of the battery.

[0056] In some embodiments, as Figure 9 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 and causing the overall height of the battery housing to be too high, thereby improving the volume utilization. The bottom of the groove 11 is provided with a first 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.

[0057] 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, the overall strength of the battery case 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, ensuring that the tab can pass through completely and smoothly even at a longer length.

[0058] In some embodiments, as Figure 9 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.

[0059] In some embodiments, as Figure 3 、 Figure 5 and Figure 7 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 in 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.

[0060] 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.

[0061] The present invention also provides a battery cell, comprising a core pack and a battery shell provided by the present invention, wherein the core pack is arranged in a cavity formed by the battery shell. A first plastic part 3 and a second plastic part 4 are respectively 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 plays a role in limiting and fixing the tab, so that the tab can have a better shape after being folded, protecting the tab and preventing the tab from short-circuiting with the battery shell due to poor folding shape of the tab.

[0062] 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. A first plastic part 3 and a second plastic part 4 are respectively 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 plays a role in limiting and fixing the tab, so that the tab can have a better shape after being folded, protecting the tab and preventing the tab from short-circuiting with the battery housing due to poor folding shape of the tab.

[0063] 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. A split 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, the cover plate (1) is arranged at the opening, and the cover plate (1) is provided with a first injection molding hole (112); A first plastic part (3) is injection-molded on a side of the cover plate (1) facing away from the shell body (2), and the first plastic part (3) is provided with a first injection-molded connecting column (32), and the first injection-molded connecting column (32) is embedded in the first injection-molded hole (112); The second plastic part (4) is injection molded on the other side of the cover plate (1), and a tab shaping unit (5) is provided on the side of the second plastic part (4) facing away from the cover plate (1).

2. The split injection molded battery cell housing according to claim 1, characterized in that: The cover plate (1) is further provided with a second injection molding hole, and the second plastic part (4) is provided with a second injection molding connecting column (42), and the second injection molding connecting column (42) is embedded in the second injection molding hole.

3. The split injection molded battery cell housing according to claim 1 or 2, characterized in that: The cover plate (1) has a first pole lug hole (111), the first plastic part (3) has a second pole lug hole (31), and the second plastic part (4) has a third pole lug hole (41); 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 third pole lug hole (41) on the cover plate (1), and the first pole lug hole (111) at least partially overlap.

4. The split injection molded battery cell housing according to claim 3, characterized in that: The tab shaping unit (5) comprises guide surfaces (51), the guide surfaces (51) being arranged on both sides of the third tab hole (41), and the guide surfaces (51) gradually moving away from the cover plate (1) from the third tab hole (41) toward the long side wall of the second plastic part (4).

5. The split injection molded battery cell housing according to claim 4, characterized in that: The cover plate (1) is provided with a groove (11) for accommodating the first plastic part (3), and the first tab hole (111) is arranged at the bottom of the groove (11).

6. The split injection molded battery cell housing according to claim 5, 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.

7. The split injection molded battery cell housing according to claim 5, characterized in that: The first injection hole (112) is arranged at the bottom of the groove (11), and a plurality of first injection holes (112) are arranged at the bottom of each groove (11).

8. The split injection molded battery cell housing according to claim 1, characterized in that: The shell body (2) and the cover plate (1) are an integrally formed structure.

9. A battery cell, characterized in that: It comprises a core pack and a split injection molded battery cell shell as described in any one of claims 4 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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