Shell, battery cell and battery pack

Abstract

The utility model relates to the technical field of power batteries, in particular to a shell, a battery cell and a battery pack. The shell comprises an outer shell, a first plastic part and a second plastic part, the outer shell is provided with a cover plate, and the cover plate is provided with a first tab through hole; the first plastic part and the second plastic part are arranged on the two sides of the cover plate respectively. One of the first plastic part and the second plastic part is provided with a hot melting part, the hot melting part penetrates through the first tab through hole to be connected with the first plastic part and the second plastic part in a hot melting or hot anchoring manner, or the first plastic part and the second plastic part are both provided with hot melting parts, and the hot melting parts extend into the first tab through hole to be connected with the first plastic part and the second plastic part in a hot melting manner. The first plastic part and the second plastic part are bonded by the hot melting part and the extending-in or extending-out first tab, so that the installation steps can be simplified, and the installation efficiency is improved. The tab shaping unit can make the shape of the folded tabs better, protect the tabs and prevent short circuit between the tabs and the energized core shell caused by poor tab folding shape.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, and in particular to a shell, a battery core and a battery pack. Background Art

[0002] In the related art, the upper plastic plate and the lower plastic plate of the battery cell are respectively arranged on both sides of the bare aluminum plate, and the bare aluminum plate is connected to the upper plastic plate and the lower plastic plate respectively through connectors. In order to make the upper plastic plate, the bare aluminum plate and the lower plastic plate connected as a whole firmly, the upper plastic plate, the bare aluminum plate and the lower plastic plate can be connected as a whole through connectors to obtain a module structure. However, the connectors need to be produced separately before the upper plastic plate, the bare aluminum plate and the lower plastic plate can be connected. They need to be pre-installed before they can be connected, resulting in cumbersome installation steps. In addition, in order to improve the space utilization rate in the battery cell shell, the battery 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.

[0003] Therefore, there is an urgent need for a housing to solve the above technical problems. Utility Model Content

[0004] The purpose of the present invention is to provide a housing, a battery cell and a battery pack, which can simplify the installation steps, improve the installation efficiency, and avoid a short circuit between the tab and the housing caused by a poor tab folding shape.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] In a first aspect, a housing is provided, comprising:

[0007] The housing has a cover plate, wherein the cover plate is provided with a first tab through hole;

[0008] a first plastic part, disposed on one side of the cover plate;

[0009] a second plastic part, disposed on the other side of the cover plate;

[0010] One of the first plastic part and the second plastic part is provided with a hot melt portion, which passes through the first tab through-hole and hot-melts or hot-anchors the first plastic part and the second plastic part, or both the first plastic part and the second plastic part are provided with a hot melt portion, which extends into the first tab through-hole and hot-melts the first plastic part and the second plastic part.

[0011] As a preferred technical solution of the above-mentioned housing, the first plastic part or the second plastic part is provided with a receiving groove.

[0012] As a preferred technical solution of the above-mentioned shell, the first plastic part is provided with a second pole lug through hole, the second plastic part is provided with a third pole lug through hole, and the accommodating groove is provided on the hole wall of the second pole lug through hole or the third pole lug through hole, and along the direction perpendicular to the cover plate, the projection of the second pole lug through hole on the cover plate and the projection of the third pole lug through hole on the cover plate at least partially overlap.

[0013] As a preferred technical solution of the above-mentioned shell, the accommodating groove includes a first groove body and a second groove body, the first groove body is connected to the second groove body, and the length of the first groove body is greater than the length of the second groove body.

[0014] As a preferred technical solution of the above-mentioned shell, the wall thickness of the first plastic part and / or the second plastic part at the position where the hot melt portion is provided is not less than 0.03 mm.

[0015] As an optimal technical solution for the above-mentioned shell, the second plastic part is provided with a third tab through hole for the tab to extend out, and a tab shaping unit is provided on the side of the second plastic part away from the cover plate, and the tab shaping unit is arranged on the side of the third tab through hole.

[0016] As an optimal technical solution of the above-mentioned shell, the tab shaping unit includes guide plates, which are arranged on both sides of the third tab through hole. From the third tab through hole to the long side wall of the second plastic part, the guide plates gradually move away from the second plastic part.

[0017] As a preferred technical solution of the above-mentioned housing, the first plastic part is a split structure; and / or,

[0018] The second plastic part is a split structure; and / or,

[0019] The first plastic part is an integrally formed structure; and / or,

[0020] The second plastic part is an integrally formed structure.

[0021] As a preferred technical solution for the above-mentioned shell, the cover plate is provided with a groove, the first plastic part is located in the groove, and 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.

[0022] As a preferred technical solution of the above-mentioned housing, the first plastic part has a flange edge, the width of the flange edge is L, wherein 0<L<10mm; and / or,

[0023] The cover plate is also provided with an explosion-proof valve and / or a liquid injection hole.

[0024] In a second aspect, a battery cell is provided, comprising a core pack and a shell as described in any of the above schemes, wherein the core pack is arranged in a cavity formed by the shell.

[0025] 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.

[0026] The utility model has at least the following beneficial effects:

[0027] Since the first plastic part and / or the second plastic part is provided with a hot melt portion, the hot melt portion passes through the first tab through hole or extends into the first tab through hole to achieve a hot melt connection between the first plastic part and the second plastic part. Compared with the prior art that requires additional pre-installation of the connector, the hot melt portion provided by the present invention does not need to be installed again. It is only necessary to hot melt or hot anchor the hot melt portion provided on the first plastic and / or second plastic part to achieve the connection between the first plastic part and the second plastic part, thereby saving processing steps and improving processing efficiency. Since the hot melt portion passes through or extends into the first tab through hole, there is no need to set up an additional hole for the hot melt portion to pass through or extend into, thereby saving the development cost of the cover plate, thereby reducing the manufacturing cost of the cover plate. The tab shaping unit plays a role in limiting and fixing the tab, so that the tab can have a better shape after being folded, protect the tab, and prevent the tab from short-circuiting with the power core shell due to poor folding shape of the tab. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] 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.

[0029] Figure 1 A schematic structural diagram of a housing provided in an embodiment of the present utility model;

[0030] Figure 2 An exploded schematic diagram of a housing provided in an embodiment of the present utility model;

[0031] Figure 3 A schematic structural diagram of a first plastic part provided in an embodiment of the present utility model;

[0032] Figure 4 for Figure 3 A partial enlarged view of the middle part;

[0033] Figure 5 for Figure 2 A partial enlarged view of point B;

[0034] Figure 6 for Figure 1 A partial enlarged view of point C in the middle;

[0035] Figure 7 A schematic structural diagram of a second plastic part provided in an embodiment of the present utility model;

[0036] Figure 8 A top view of a housing provided in an embodiment of the present utility model;

[0037] Figure 9 for Figure 8 Cross-sectional view at DD in the middle;

[0038] Figure 10 for Figure 9 A partial enlarged view of point E in the middle;

[0039] Figure 11 for Figure 9 A partial enlarged view of the FF in the middle.

[0040] In the picture:

[0041] 1. Cover plate; 11. First tab through hole; 12. Groove; 13. Liquid injection hole; 2. First plastic part; 21. Receiving groove; 211. First trough body; 212. Second trough body; 22. Second tab through hole; 3. Second plastic part; 31. Hot melt part; 32. Third tab through hole; 33. Tab shaping unit; 331. Guide plate; 4. Shell body; 5. Explosion-proof valve. DETAILED DESCRIPTION

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] like Figures 1-6 As shown, an embodiment of the present invention provides a shell, which includes an outer shell, a first plastic part 2 and a second plastic part 3, the outer shell has a cover plate 1, and the cover plate 1 is provided with a first pole ear through hole 11; the first plastic part 2 is arranged on one side of the cover plate 1; the second plastic part 3 is arranged on the other side of the cover plate 1, that is, the first plastic part 2 and the second plastic part 3 are respectively arranged on both sides of the cover plate 1, and the first plastic part 2 and the second plastic part 3 are respectively connected to the cover plate 1; one of the first plastic part 2 and the second plastic part 3 is provided with a hot melt portion 31, the hot melt portion 31 passes through the first pole ear through hole 11 and is hot-melted or hot-anchored to connect the first plastic part 2 and the second plastic part 3, or, the first plastic part 2 and the second plastic part 3 are both provided with a hot melt portion 31, the hot melt portion 31 extends into the first pole ear through hole 11 and is hot-melted to connect the first plastic part 2 and the second plastic part 3.

[0047] Since the first plastic part 2 and / or the second plastic part 3 are provided with a hot melt portion 31, the hot melt portion 31 passes through the first tab through hole 11 or extends into the first tab through hole 11 to achieve a hot melt connection between the first plastic part 2 and the second plastic part 3. Compared with the prior art that requires additional pre-installation of the connector, the hot melt portion 31 provided by the utility model does not need to be installed again. It is only necessary to perform a hot melt or hot anchoring step on the hot melt portion 31 provided on the first plastic part 2 and / or the second plastic part 3 to achieve the connection between the first plastic part 2 and the second plastic part 3, thereby saving processing steps and improving processing efficiency. Since the hot melt portion 31 passes through or extends into the first tab through hole 11, there is no need to set up an additional hole for the hot melt portion 31 to pass through or extend into, thereby saving the development cost of the cover plate 1, thereby reducing the manufacturing cost of the cover plate 1. The tab shaping unit 33 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 energized core shell due to poor tab folding shape.

[0048] It should be noted that the housing further includes a housing body 4 , and the cover plate 1 is arranged at the opening of the housing body 4 .

[0049] In some embodiments, as Figure 3-Figure 6 As shown, when the first plastic part 2 and the second plastic part 3 are both provided with a hot melt portion 31, the first plastic part 2 and the second plastic part 3 are provided with a receiving groove 21. The hot melt portion 31 extends into the first tab through-hole 11 and is connected as a whole after being hot-melted, and a bulge will appear to affect the tab passing through the first tab through-hole 11. The hot melt portion 31 is hot-melted in the receiving groove 21 to fill the receiving groove 21, thereby avoiding the formation of a bulge after hot-melting and affecting the tab passing through the first tab through-hole 11.

[0050] In some other embodiments, one of the first plastic part 2 and the second plastic part 3 is provided with a receiving groove 21, and the other is provided with a hot melt portion 31. The hot melt portion 31 passes through the first tab through-hole 11 and is hot-melted within the receiving groove 21. The receiving groove 21 can prevent the formation of a protrusion on the sidewall of the first tab through-hole 11 that would affect the passage of the tab. In addition, the receiving groove 21 can also prevent the formation of a protrusion on the surface of the plastic part where it is located, which would increase the overall height of the housing. At the same time, the cover plate 1 does not need to be provided with an additional hole for the hot melt portion 31 to pass through, saving the development cost of the cover plate 1 and thus reducing the manufacturing cost of the cover plate 1.

[0051] In some embodiments, the first plastic part 2 is provided with a second tab through-hole 22, and the second plastic part 3 is provided with a third tab through-hole 32. The receiving groove 21 is provided on the hole wall of the second tab through-hole 22 or the third tab through-hole 32 to avoid the influence of the hot melt portion 31 on the tab. In a direction perpendicular to the cover plate 1, the projection of the second tab through-hole 22 on the cover plate 1 and the projection of the third tab through-hole 32 on the cover plate 1 at least partially overlap. Preferably, the projection of the second tab through-hole 22 on the cover plate 1 and the projection of the third tab through-hole 32 on the cover plate 1 completely overlap, thereby facilitating the passage of the tab. Of course, in some other embodiments, the receiving groove 21 can be provided on the surface of the first plastic part 2 or the second plastic part 3.

[0052] Specifically, if Figure 4 As shown, the accommodating groove 21 includes a first groove body 211 and a second groove body 212, wherein the first groove body 211 and the second groove body 212 are vertically connected. It can be understood that the shape of the accommodating groove 21 can be L-shaped or T-shaped. In this embodiment, it is preferably T-shaped. The length of the first groove body 211 is greater than the length of the second groove body 212. The hot melt portion 31 extends into the second groove body 212 and the first groove body 211 and then hot melts or hot anchors to fix the first plastic part 2 and the second plastic part 3.

[0053] In some embodiments, the wall thickness of the position where the hot melt portion 31 is provided on the first plastic part 2 and the second plastic part 3 is not less than 0.03 mm. This can improve the insulation performance of the structure at the hot melt position of the first plastic part 2 and the second plastic part 3, and avoid the first plastic part 2 and / or the second plastic part 3 provided with the hot melt portion 31 from being melted through during the hot melting or hot anchoring process.

[0054] Of course, in some other embodiments, the first plastic part 2 is provided with a hot melt portion 31, and the thickness of the position where the hot melt portion 31 is provided on the first plastic part 2 is not less than 0.03 mm, which can improve the insulation performance of the structure at the hot melt position of the first plastic part 2.

[0055] In some other embodiments, the second plastic part 3 is provided with a hot melt portion 31 , and the thickness of the location where the hot melt portion 31 is provided on the second plastic part 3 is not less than 0.03 mm, thereby improving the insulation performance of the structure at the hot melt location of the second plastic part 3 .

[0056] In the related art, the tabs are connected to the connecting pieces after being folded, and the connecting pieces are connected to the poles, thereby achieving the purpose of connecting the tabs to the poles. However, the tabs have a poor shape after being folded, which can easily cause a short circuit. Therefore, in some embodiments, such as Figure 7 and Figure 8As shown, the second plastic part 3 is provided with a third tab through-hole 32 for the tab to extend out, and a tab shaping unit 33 is provided on the side of the second plastic part 3 facing away from the cover plate 1. The tab shaping unit 33 is provided on the side of the second tab through-hole 22. The tab shaping unit 33 plays a role in limiting and fixing the tab, so that the tab can be folded into a better shape, protecting the tab and preventing the tab from short-circuiting with the housing due to poor tab folding shape.

[0057] Specifically, the number of the tab shaping units 33 is greater than or equal to the number of the second tab through-holes 22 , that is, the tab shaping unit 33 may be single or multiple.

[0058] Furthermore, if Figure 11 As shown, the tab shaping unit 33 includes guide plates 331, which are arranged on both sides of the third tab through-hole 32. The extension direction of the guide plates 331 is the same as the longitudinal extension direction of the third tab through-hole 32. The guide plates 331 gradually move away from the second plastic part 3 from the third tab through-hole 32 toward the long sidewall of the second plastic part 3. In other words, the guide plates 331 are arranged at an angle relative to the second plastic part 3. The guide plates 331 provide guidance for the tabs and always limit and press the tabs after they are folded together, thereby keeping the tabs in a folded state and preventing the tabs from separating from each other.

[0059] The tab passes through the third tab through hole 32 , the first tab through hole 11 and the second tab through hole 22 and is folded over the first plastic part 2 , 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.

[0060] If the tabs include a positive tab and a negative tab, the positive tab or the negative tab passes through the first tab through-hole 11 on the cover plate 1, and the number N of the first tab through-holes 112 is ≥1; if both the positive tab and the negative tab pass through the first tab through-hole 11 set on the cover plate 1, then the number of the first tab through-holes 11 on the cover plate 1 is ≥1, that is, the positive tab and the negative tab pass through the same first tab through-hole 11 or pass through different first tab through-holes 11 respectively, and the tabs pass through the first tab through-hole 11 and are folded over the shell, which can improve the internal space utilization of the battery.

[0061] In some embodiments, the first plastic part 2 is a split structure, which is easy to manufacture.

[0062] And / or, in some embodiments, the second plastic part 3 is a split structure, which is easy to manufacture.

[0063] And / or, in some embodiments, the first plastic part 2 is an integrally formed structure, which is convenient for subsequent assembly and installation, and the second tab through hole 22 and the receiving groove 21 are formed simultaneously during the injection molding process, which is convenient for subsequent assembly and installation.

[0064] And / or, in some embodiments, the second plastic part 3 is an integrally formed structure, and the third tab through hole 32, the tab shaping unit 33 and the hot melt portion 31 are formed simultaneously during the injection molding process, which facilitates subsequent assembly and installation.

[0065] In some embodiments, as Figure 8-10 As shown, the cover plate 1 is provided with a groove 12, and the first plastic part 2 is located within the groove 12. The provision of the groove 12 prevents the first plastic part 2 from protruding too much, thereby increasing the overall height of the housing and improving volume utilization. Specifically, the distance between the surface of the flange of the first plastic part 2 facing away from the groove 12 and the surface of the cover plate 1 facing away from the second plastic part 3 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.

[0066] When the distance between the flange surface and the surface of the cover plate 1 facing away from the second plastic part 3 is -0.5H, the surface of the first plastic part 2 facing away from the groove 12 lies within the groove 12 and does not protrude beyond it, thereby improving volume utilization. Furthermore, when the distance between the surface of the first plastic part 2 facing away from the groove 12 and the surface of the cover plate 1 facing away from the second plastic part 3 is H, reduced housing strength is avoided.

[0067] In some embodiments, the first plastic part 2 has a flange with a width L, where 0 < L < 10 mm. For example, L can be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, or 10 mm, without specific limitation. This configuration avoids the risk of an excessively large flange causing increased weight, material, and cost of the first plastic part 2, which could affect the housing design.

[0068] In some embodiments, continue to refer to Figure 1 The cover plate 1 is also provided with an explosion-proof valve 5 and / or a liquid injection hole 13. The explosion-proof valve 5 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 3) or the outer side (the side facing the first plastic part 2). The liquid injection hole 13 can be provided near the positive electrode column, near the negative electrode column, or between the positive and negative electrode columns.

[0069] An embodiment of the present invention further provides a battery core, comprising a core pack and a shell provided by the present invention, wherein the core pack is disposed in a cavity formed by the shell.

[0070] Since the above-mentioned shell is included, the battery cell of the embodiment of the present invention has all the advantages and beneficial effects of the above-mentioned embodiments, which will not be repeated here. Since the first plastic part 2 and / or the second plastic part 3 of the shell are provided with a hot melt portion 31, the hot melt portion 31 passes through the first tab through-hole 11 or the hot melt portion 31 extends into the first tab through-hole 11 to achieve a hot melt connection between the first plastic part 2 and the second plastic part 3. Compared with the connector in the prior art that requires additional pre-installation, the hot melt portion 31 provided by the present invention does not need to be installed again. It is only necessary to hot-melt or hot-anchor the hot melt portion 31 provided on the first plastic part 2 and / or the second plastic part 3 to achieve the connection between the first plastic part 2 and the second plastic part 3, thereby saving processing steps and improving processing efficiency. Since the hot melt portion 31 passes through or extends into the first tab through-hole 11, there is no need to set up an additional hole for the hot melt portion 31 to pass through or extend into, thereby saving the development cost of the cover plate 1, thereby reducing the manufacturing cost of the cover plate 1. The tab shaping unit 33 plays a role in limiting and fixing the tab, so that the tab can have a better shape after being folded, protect the tab, and prevent the tab from being short-circuited with the energized core shell due to poor folded shape of the tab.

[0071] In an embodiment of the present invention, a battery pack is further provided, 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 2 and / or the second plastic part 3 of the battery cell is provided with a hot melt portion 31, the hot melt portion 31 passes through the first tab through-hole 11 or the hot melt portion 31 extends into the first tab through-hole 11 to achieve a hot melt connection between the first plastic part 2 and the second plastic part 3. Compared with the prior art in which the connectors need to be pre-installed, the hot melt portion 31 provided by the present invention does not need to be installed again. It is only necessary to hot melt or hot anchor the hot melt portion 31 provided on the first plastic part 2 and / or the second plastic part 3 to achieve the connection between the first plastic part 2 and the second plastic part 3, thereby saving processing steps and improving processing efficiency. Since the hot melt portion 31 passes through or extends into the first tab through-hole 11, there is no need to set up an additional hole for the hot melt portion 31 to pass through or extend into, thereby saving the development cost of the cover plate 1, thereby reducing the manufacturing cost of the cover plate 1. The tab shaping unit 33 plays a role in limiting and fixing the tab, so that the tab can have a better shape after being folded, protect the tab, and prevent the tab from being short-circuited with the energized core shell due to poor folded shape of the tab.

[0072] Since the battery pack includes the above-mentioned battery cells, the battery pack of the embodiment of the present invention has all the advantages and beneficial effects of the above-mentioned embodiments, which will not be described in detail here.

[0073] 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 housing, characterized in that: include: The housing comprises a cover plate (1), wherein the cover plate (1) is provided with a first tab through hole (11); A first plastic part (2) is arranged on one side of the cover plate (1); A second plastic part (3) is arranged on the other side of the cover plate (1); One of the first plastic part (2) and the second plastic part (3) is provided with a hot melt portion (31), the hot melt portion (31) passes through the first tab through-hole (11) and connects the first plastic part (2) and the second plastic part (3) by hot melting or hot anchoring, or the first plastic part (2) and the second plastic part (3) are both provided with a hot melt portion (31), the hot melt portion (31) extends into the first tab through-hole (11) and connects the first plastic part (2) and the second plastic part (3) by hot melting; A tab shaping unit (33) is provided on the side of the second plastic part (3) facing away from the cover plate (1).

2. The housing according to claim 1, wherein: The first plastic part (2) or the second plastic part (3) is provided with a receiving groove (21).

3. The housing according to claim 2, wherein: The first plastic part (2) is provided with a second pole lug through hole (22), the second plastic part (3) is provided with a third pole lug through hole (32), the accommodating groove (21) is provided on the hole wall of the second pole lug through hole (22) or the third pole lug through hole (32), and along a direction perpendicular to the cover plate (1), the projection of the second pole lug through hole (22) on the cover plate (1) and the projection of the third pole lug through hole (32) on the cover plate (1) at least partially overlap.

4. The housing according to claim 2, wherein: The accommodating groove (21) comprises a first groove body (211) and a second groove body (212); the first groove body (211) is connected to the second groove body (212); the length of the first groove body (211) is greater than the length of the second groove body (212).

5. The housing according to claim 1, wherein: The wall thickness of the first plastic part (2) and / or the second plastic part (3) at the location where the hot melt portion (31) is provided is not less than 0.03 mm.

6. The housing according to claim 1, wherein: The second plastic part (3) is provided with a third tab through-hole (32) for the tab to extend out, and the tab shaping unit (33) is provided on the side of the third tab through-hole (32).

7. The housing according to claim 6, wherein: The tab shaping unit (33) comprises a guide plate (331), wherein the guide plate (331) is arranged on both sides of the third tab through hole (32), and the guide plate (331) gradually moves away from the second plastic part (3) from the third tab through hole (32) toward the long side wall of the second plastic part (3).

8. The housing according to claim 1, wherein: The cover plate (1) is provided with a groove (12), the first plastic part (2) is located in the groove (12), and the distance between the surface of the flange edge of the first plastic part (2) facing away from the groove (12) and the surface of the cover plate (1) facing away from the second plastic part (3) 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.

9. A battery cell, characterized in that: The invention comprises a core package and a shell as claimed in any one of claims 1 to 8, wherein the core package is arranged in a cavity formed by the 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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