Battery shell and battery

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery shell and a battery, the battery shell comprises a shell assembly and a protection plate group, the shell assembly comprises a composite shell, a bottom sealing plate and a composite pole, and the bottom sealing plate and the composite shell form an accommodating cavity for accommodating the pole group; the composite shell is provided with a first penetrating structure for the pole lug to extend out and a first insulating layer for isolating the pole lug, the protection plate group comprises a protection end plate provided with a second penetrating structure, and the pole lug sequentially penetrates through the second penetrating structure and the first penetrating structure to realize current conduction with the composite pole column. The tab extends out of the accommodating cavity to be connected with the composite pole, so that the space occupied by the composite pole and the space for connecting the bent tab with the composite pole are saved, the extra space occupation is reduced, the volume of the pole group can be further increased, the energy density is improved, and the protection end plate for supporting and fixing the tab is arranged, so that the energy density is improved. Therefore, skewing of the tabs is avoided, and the reliability of the structure is improved.

Description

Technical Field

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

[0002] For prismatic batteries, the battery case and electrode group are indispensable components of the battery, with the electrode group and the battery case together forming a complete battery. The electrode group is the core component of the battery, responsible for storing and releasing electrical energy. The electrode group is primarily composed of positive electrode material, negative electrode material, electrolyte, and separator. The electrode group is the smallest unit of a power battery and serves as the electrical energy storage unit. It must have a high energy density to store as much electrical energy as possible. The battery case is the container that wraps the electrode group. It not only provides physical protection, preventing the electrode group from being affected by the external environment, but also helps dissipate heat from the electrode group, maintaining battery stability. Therefore, the performance of the battery case has a significant impact on the assembly, safety, and performance of the battery.

[0003] Among them, since the electrode group of the square shell battery is in the form of a single-sided electrode ear, the traditional square shell battery shell usually includes a shell body and a cover assembly for sealing the shell body to form a accommodating cavity for accommodating the electrode group. The cover assembly mainly includes a pole, a welding station, a cover body, an upper plastic and a lower plastic, etc. The positive electrode ear and the negative electrode ear of the pole group are respectively connected to the positive pole and the negative pole on the cover assembly. In order to facilitate the connection between the positive electrode ear and the negative electrode ear and the corresponding positive pole and the negative pole, usually part of the positive and negative poles are located inside the accommodating cavity and part of them are located outside the accommodating cavity. In order to facilitate the connection between the positive and negative pole ears and the positive and negative poles extending into the accommodating cavity, the positive and negative pole ears need to be bent to achieve the connection between the two.

[0004] On the one hand, the square shell battery of this structure occupies a large amount of extra space in the accommodating cavity because part of the pole extends into the interior of the accommodating cavity, and the pole ear needs to be bent and connected to the part of the pole extending into the accommodating cavity, which greatly compresses the space available for the pole group. This not only leads to extremely low space utilization, but also limits the volume of the pole group, reducing the energy density of the square shell battery. On the other hand, since it is necessary to weld the cover plate to the battery shell, the welding station to the cover plate, and the welding station to the pole on the pole ear side, a large number of welding operations are concentrated on the pole ear side. The high temperature generated by a large number of welding operations will cause the microstructure of the pole ear material to change, thereby affecting its electrical and mechanical properties, resulting in an increase in the resistance of the pole ear, thereby affecting the discharge performance and cycle life of the square shell battery. Utility Model Content

[0005] The purpose of the utility model is to provide a battery housing and a battery with high space utilization, high energy density and strong structural reliability.

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

[0007] In one aspect, a battery housing is provided, comprising:

[0008] A shell assembly, comprising a composite shell, a bottom sealing plate, and a composite pole; the composite shell is a hollow shell structure with a single-side opening; the bottom sealing plate is provided at the opening of the composite shell to form an accommodating cavity for accommodating the pole group; the pole group located in the accommodating cavity is provided with a pole lug; a first penetrating structure for extending the pole lug is provided on a wall surface of the composite shell opposite to the bottom sealing plate; and a first insulating layer for isolating the composite shell from the pole lug is injection-molded on the wall surface; the composite pole is provided outside the wall surface of the composite shell having the first penetrating structure, and realizes current conduction with the pole lug;

[0009] A protective plate group, the protective plate group includes a protective end plate, the protective end plate is located in the accommodating cavity, and is provided on the side of the pole group extending out of the pole ear, the protective end plate is provided with a second penetrating structure connected to the first penetrating structure, the pole ear passes through the second penetrating structure and the first penetrating structure in sequence to achieve current conduction with the composite pole.

[0010] Optionally, a shaping structure corresponding to the second penetrating structure is provided on a side of the protective end plate facing the pole group, and the shaping structure is a trumpet-shaped structure with an opening gradually shrinking in a direction away from the pole group.

[0011] Optionally, the composite shell comprises:

[0012] A housing body, the housing body comprising a first wall surface and a plurality of second walls perpendicular to the first wall surface, the plurality of second walls being arranged around the periphery of the first wall surface to form a hollow shell structure open on one side, the first wall surface being provided with a receiving groove and a plug-in through-hole, the plug-in through-hole being provided in the receiving groove;

[0013] The first insulating layer is injection molded on the first wall surface and includes an upper insulating portion, a lower insulating portion and a plug-in portion. The upper insulating portion is provided on the side of the first wall surface facing away from the pole group and is located in the accommodating groove. The lower insulating portion is provided on the side of the first wall surface facing the pole group and is located between the first wall surface and the protective end plate. The plug-in portion is inserted in the plug-in through hole and is used to connect the upper insulating portion and the lower insulating portion. The first penetrating structure penetrates the upper insulating portion, the plug-in portion and the lower insulating portion and is connected to the second penetrating structure.

[0014] Optionally, the upper insulating portion is provided with a mounting boss protruding in a direction away from the pole group, and a mounting groove is provided on the mounting boss. The shell assembly also includes a connecting piece, which is arranged in the mounting groove, and the pole ear passing through the first through-structure is connected to the connecting piece, and the connecting piece is connected to the composite pole.

[0015] Optionally, a limiting groove is provided on a side of the protective end plate facing away from the pole group, and the lower insulating portion is embedded in the limiting groove.

[0016] Optionally, the composite pole includes a pole body, a welding ring and a second insulating layer, the second insulating layer is injection-molded between the pole body and the welding ring to insulate and connect the pole body and the welding ring into one, the welding ring is welded in the accommodating groove, and the pole body is connected to the connecting piece.

[0017] Optionally, a connecting boss protruding close to the pole body is provided on a side of the connecting piece facing the pole body, and the pole body is welded to the connecting boss.

[0018] Optionally, the housing assembly further includes a sealing member, which is disposed in the accommodating groove and is sandwiched between the pole body and the first wall surface.

[0019] Optionally, the protective plate group further includes a bottom supporting plate, the outer side of the electrode group is covered with an insulating film, the bottom supporting plate is arranged on the surface of the electrode group opposite to the electrode tab, and is thermally melt-connected to the insulating film.

[0020] On the other hand, a battery is further provided, comprising a pole group and a battery casing as described in any one of the above items, wherein the pole group is disposed in the battery casing.

[0021] Beneficial effects of the utility model:

[0022] The utility model provides a battery casing, which provides a first penetrating structure on the wall surface opposite to the composite casing and a bottom sealing plate, and provides a protective end plate with a second penetrating structure in the accommodating cavity, so that the pole lug of the pole group extends out of the accommodating cavity through the first penetrating structure and the second penetrating structure. On the one hand, not only the space occupied by the composite pole and the space for connecting the pole lug and the composite pole are saved, the space occupation is reduced, and the utilization rate of the space is improved, so that the volume of the pole group can be increased and the energy density can be improved, but also the protective end plate is used to support and fix the pole lug to prevent the pole lug from being skewed. On the other hand, by welding the bottom sealing plate to the side of the composite casing away from the pole lug, the welding operation on the pole lug side is reduced, the influence of high temperature generated by a large amount of welding operation on the microstructure of the pole lug is avoided, and the discharge performance and cycle life of the battery are improved.

[0023] The utility model also provides a battery, which reduces the occupation of additional space by applying the above-mentioned battery shell, expands the space available for the electrode group, and increases the volume of the electrode group, thereby having not only higher energy density but also stronger power supply capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is an exploded view of the structure of the battery provided by the utility model;

[0025] Figure 2 This is a partial front structural cross-sectional view of the battery provided by the present utility model;

[0026] Figure 3 This is a partial side structural cross-sectional view of the battery provided by the present invention;

[0027] Figure 4 This is a structural diagram of the outer shell body of the battery shell provided by the present invention;

[0028] Figure 5 This is a schematic structural diagram of the first insulating layer in the battery housing provided by the present invention;

[0029] Figure 6 It is a structural schematic diagram of the protective end plate in the battery housing provided by the utility model.

[0030] In the picture:

[0031] 100, electrode group; 101, electrode tab; 200, insulating film;

[0032] 1. Housing assembly; 11. Composite housing; 111. Housing body; 1111. First wall; 1112. Second wall; 1113. Accommodating groove; 1114. Connecting hole; 112. First insulating layer; 1121. Upper insulating portion; 11211. Mounting boss; 11212. Mounting groove; 1122. Lower insulating portion; 1123. Connecting portion; 1124. First penetration structure; 12. Bottom sealing plate; 13. Composite pole; 131. Pole body; 132. Welding ring; 133. Second insulating layer; 14. Connecting piece; 141. Connecting boss; 15. Sealing element

[0033] 2. Protective plate group; 21. Protective end plate; 211. Second penetrating structure; 212. Shaping structure; 213. Limiting groove; 22. Bottom supporting plate. DETAILED DESCRIPTION

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] On the one hand, since part of the pole extends into the interior of the accommodating cavity, and the tab needs to be bent and connected to the part of the pole extending into the accommodating cavity, a large amount of extra space in the accommodating cavity is occupied, which greatly compresses the space available for the pole group. This not only leads to extremely low space utilization, but also limits the volume of the pole group and reduces the energy density of the square shell battery. On the other hand, since a large amount of welding work is required on the pole tab side, the pole tab material undergoes microstructural changes due to the high temperature generated by the large amount of welding work, thereby affecting its electrical and mechanical properties, resulting in an increase in the resistance of the pole tab, which in turn affects the discharge performance and cycle life of the square shell battery.

[0039] Therefore, in order to avoid the influence of high temperature generated by a large number of concentrated welding operations on the tab and reduce the space occupied by the welding of the tab and the pole, improve the product yield and energy density, the embodiment provides a battery shell for accommodating a pole group.

[0040] As shown in Figures 1 to 6 The battery shell includes a shell assembly 1 and a protection plate group 2, the shell assembly 1 includes a composite shell 11, a bottom sealing plate 12 and a composite pole 13, the composite shell 11 is a single-side open hollow shell structure, the bottom sealing plate 12 is arranged at the opening of the composite shell 11 to form an accommodation cavity for accommodating the pole group 100, the pole group 100 in the accommodation cavity is provided with a tab 101, the wall surface opposite to the bottom sealing plate 12 of the composite shell 11 is provided with a first penetrating structure 1124 for the tab 101 to extend out and a first insulation layer 112 is injection molded on the wall surface for isolating the composite shell 11 and the tab 101, the composite pole 13 is arranged outside the wall surface of the composite shell 11 provided with the first penetrating structure 1124 and realizes the conduction of current with the tab 101, the protection plate group 2 includes a protection end plate 21, the protection end plate 21 is located in the accommodation cavity and is arranged at one side of the pole group 100 extending the tab 101, the protection end plate 21 is provided with a second penetrating structure 211 in communication with the first penetrating structure 1124, and the tab 101 realizes the conduction of current with the composite pole 13 by sequentially penetrating through the second penetrating structure 211 and the first penetrating structure 1124.

[0041] By arranging the first penetrating structure 1124 on the wall surface opposite to the bottom sealing plate 12 of the composite shell 11 and the protection end plate 21 provided with the second penetrating structure 211 in the accommodation cavity, the tab 101 of the pole group 100 extends out of the accommodation cavity through the first penetrating structure 1124 and the second penetrating structure 211, on the one hand, not only the space occupied by the composite pole 13 and the space for connecting the tab 101 and the composite pole 13 are saved, the space occupation is reduced, the space utilization is improved, the volume of the pole group 100 can be increased, the energy density is improved, and the tab 101 is supported and fixed by the protection end plate 21 to prevent the tab 101 from being skewed, on the other hand, the bottom sealing plate 12 is welded on the side of the composite shell 11 away from the tab 101, thereby reducing the welding operation on the side of the tab 101, reducing the influence of high temperature generated by a large number of welding operations on the microstructure of the tab 101, and improving the discharge performance and cycle life of the battery.

[0042] Among them, the number of first through-hole structures 1124 and second through-hole structures 211 is the same, and the number of settings is determined according to the number of pole groups 100 accommodated in the accommodating cavity. In this embodiment, two pole groups 100 are provided in the accommodating cavity, so four first through-hole structures 1124 are provided on the composite shell 11, and four second through-hole structures 211 are also provided on the protective end plate 21, which are used for the pole ears 101 to extend out of the accommodating cavity, wherein the pole ears 101 of the same polarity on the two pole groups 100 are connected to the same composite pole 13, thereby reducing the number of components and making the structure more compact.

[0043] Alternatively, as Figure 3 As shown, a shaping structure 212 corresponding to the second penetrating structure 211 is provided on the side of the protective end plate 21 facing the pole group 100 . The shaping structure 212 is a trumpet-shaped structure with an opening gradually shrinking in a direction away from the pole group 100 .

[0044] By providing a shaping structure 212 on the side of the protective end plate 21 facing the electrode group 100, and making the shaping structure 212 into a trumpet-shaped shape with an opening gradually narrowing in the direction away from the electrode group 100, the multiple converged pole tabs 101 on the electrode group 100 can be better supported and fixed, the convergence state of the pole tabs 101 can be improved, and the problem of short circuit inside the battery caused by poor convergence effect of the pole tabs 101 can be avoided.

[0045] In this embodiment, the protective end plate 21 is also a plastic part made by injection molding. The protective end plate 21 cooperates with the first insulating layer 112 to provide double insulation protection for the tab 101 when it extends out of the accommodating cavity, thereby reducing the risk of short circuit.

[0046] Alternatively, as Figure 3 、 Figure 4 、 Figure 5As shown, the composite shell 11 includes a shell body 111 and a first insulating layer 112. The shell body 111 includes a first wall 1111 and a plurality of second walls 1112 perpendicular to the first wall 1111. The plurality of second walls 1112 are arranged around the periphery of the first wall 1111 to form a hollow shell structure with a single side opening. The first wall 1111 is provided with a receiving groove 1113 and a plug-in through hole 1114. The plug-in through hole 1114 is provided in the receiving groove 1113. The first insulating layer 112 is injection molded on the first wall 1111 and includes an upper insulating portion 1121, a lower insulating portion 1122, and a lower insulating portion 1123. 1122 and the plug-in portion 1123, the upper insulating portion 1121 is arranged on the side of the first wall 1111 away from the pole group 100, and is located in the accommodating groove 1113, the lower insulating portion 1122 is arranged on the side of the first wall 1111 facing the pole group 100, and is located between the first wall 1111 and the protective end plate 21, the plug-in portion 1123 is inserted in the plug-in through hole 1114, and is used to connect the upper insulating portion 1121 and the lower insulating portion 1122, the first through-structure 1124 penetrates the upper insulating portion 1121, the plug-in portion 1123 and the lower insulating portion 1122 and is connected to the second through-structure 211.

[0047] By providing a first insulating layer 112 consisting of an upper insulating portion 1121, a lower insulating portion 1122 and a plug-in portion 1123, and making the upper insulating portion 1121 disposed on the side of the first wall 1111 of the shell body 111 away from the electrode group 100, and making the lower insulating portion 1122 disposed on the side of the first wall 1111 of the shell body 111 facing the electrode group 100, making the plug-in portion 1123 inserted into the plug-in through hole 1114, and making the first penetrating structure 1124 penetrate the upper insulating portion 1121, the plug-in portion 1123 and The lower insulating portion 1122 is connected to the second through-hole structure 211, so that the first insulating layer 112 is used to implement insulation protection for both sides of the first wall 1111 of the shell body 111 and the inside of the plug-in hole 1114, and isolate the pole ear 101 and the first wall 1111 of the shell body 111, so as to prevent the pole ear 101 from coming into direct contact with the first wall 1111 of the shell body 111 when passing through the first wall 1111 of the shell body 111, resulting in a short circuit, thereby ensuring safety and protection.

[0048] In this embodiment, the housing body 111 is an aluminum shell, and the first insulating layer 112 is a plastic part directly molded onto the first wall 1111 of the housing body 111 through an injection molding process. Compared to traditional cover assemblies, the separate lower insulating part is eliminated, thereby reducing the number of parts and simplifying the assembly process. In addition, in this embodiment, the upper insulating portion 1121, the plug portion 1123, and the lower insulating portion 1122 are an integrated structural component formed simultaneously through the injection molding process. In other embodiments, the upper insulating portion 1121, the plug portion 1123, and the lower insulating portion 1122 can also be separately injection molded and then plugged into each other, making the first insulating layer 112 a split structural component.

[0049] Alternatively, as Figure 3 、 Figure 5 As shown, the upper insulating portion 1121 is provided with a mounting boss 11211 protruding in a direction away from the pole group 100, and a mounting groove 11212 is provided on the mounting boss 11211. The shell assembly 1 also includes a connecting piece 14, which is arranged in the mounting groove 11212, and the pole ear 101 passing through the first through-structure 1124 is connected to the connecting piece 14, and the connecting piece 14 is connected to the composite pole 13.

[0050] By connecting the tab 101 to the connecting piece 14, and then connecting the connecting piece 14 to the composite pole 13, not only is welding easier, but the tab 101 can also be fixed in position in advance using the connecting piece 14, ensuring the accuracy of the tab 101 position during subsequent operations and preventing the tab 101 from shifting, which could affect the conduction of current between the tab 101 and the composite pole 13. Furthermore, a mounting groove 11212 for accommodating the connecting piece 14 is provided on the mounting boss 11211 to limit the position of the connecting piece 14, thereby ensuring the accuracy of the position of the connecting piece 14.

[0051] In this embodiment, the shape of the mounting groove 11212 is adapted to the shape of the connecting piece 14 . The shape of the connecting piece 14 can be circular, elliptical or polygonal, etc. The specific shape is adjusted based on the convenience of welding with the tab 101 .

[0052] Alternatively, as Figure 3As shown, a retaining groove 213 is provided on the side of the protective end plate 21 facing away from the pole group 100, and the lower insulating portion 1122 is embedded in the retaining groove 213. By providing the retaining groove 213 on the side of the protective end plate 21 facing away from the pole group 100, it facilitates positioning when assembling the lower insulating portion 1122 and the protective end plate 21, ensuring the accuracy of the position of the two after assembly. The protective end plate 21 can be selected to form an integral structure with the first insulating layer 112 through an injection molding process, or the lower insulating part 1122 can be separated so that the protective end plate 21 and the lower insulating part 1122 form an integral structure through an injection molding process, and the upper insulating part 1121 and the plug-in part 1123 form an integral structure through an injection molding process, and then the two are combined to provide insulation protection for the pole ear 101. In this embodiment, the protective end plate 21 and the first insulating layer 112 are two independent split structures, the protective end plate 21 is separately molded through an injection molding process, and the first insulating layer 112 is separately molded on the first wall 1111 through an injection molding process, and the connection between the protective end plate 21 and the first insulating layer 112 is achieved by plugging the limiting groove 213 and the lower insulating part 1122.

[0053] Alternatively, as Figure 1 、 Figure 3 As shown, the composite pole 13 includes a pole body 131, a welding ring 132 and a second insulating layer 133. The second insulating layer 133 is injection-molded between the pole body 131 and the welding ring 132 to insulate and connect the pole body 131 and the welding ring 132 into one body. The welding ring 132 is welded in the receiving groove 1113, and the pole body 131 is connected to the connecting piece 14.

[0054] By injection molding the second insulating layer 133 between the pole body 131 and the welding ring 132, the pole body 131 and the welding ring 132 are connected as one. On the one hand, the number of parts during assembly is reduced, the assembly time is shortened, and the assembly efficiency is improved. On the other hand, since the second insulating layer 133 is a plastic part formed by an injection molding process, an insulated connection between the pole body 131 and the welding ring 132 is achieved, which has high insulation protection performance and avoids the pole body 131 from being connected to the shell body 111 through the welding ring 132, thereby preventing the problem of short circuit.

[0055] In this embodiment, the pole body 131 is made of different materials according to the polarity of the pole ear 101. When the pole body 131 is connected to the positive pole ear, the pole body 131 is made of pure aluminum. When the pole body 131 is connected to the negative pole ear, the pole body 131 is made of a copper-aluminum composite material. Compared with the pole body 131 made of pure copper, the manufacturing cost of the pole body 131 connected to the negative pole ear is effectively reduced.

[0056] Alternatively, as Figure 3As shown, the side of the connecting piece 14 facing the pole body 131 is provided with a connecting boss 141 that protrudes along and near the pole body 131. The pole body 131 is welded to the connecting boss 141. The provision of the connecting boss 141 on the side of the connecting piece 14 facing the pole body 131 facilitates welding of the connecting piece 14 and the pole body 131. The size and shape of the connecting boss 141 can be freely set according to needs, as long as there is sufficient welding area between the connecting boss 141 and the pole body 131. In this embodiment, the connecting boss 141 is a frustum.

[0057] In addition, the connecting piece 14 is made of different materials according to the different polarities of the electrode tab 101. When the connecting piece 14 is connected to the positive electrode tab, the connecting piece 14 is made of pure aluminum. When the connecting piece 14 is connected to the negative electrode tab, the connecting piece 14 is made of copper-aluminum composite material. Compared with the connecting piece 14 made of pure copper, the manufacturing cost of the connecting piece 14 connected to the negative electrode tab is effectively reduced.

[0058] Optionally, the tab 101 is connected to the side of the connecting piece 14 facing the electrode group 100. By connecting the tab 101 to the side of the connecting piece 14 facing the electrode group 100, the length of the tab 101 is shortened, thereby improving the efficiency of current transmission.

[0059] Optionally, the tab 101 is connected to the side of the connecting piece 14 facing the composite pole 13. By connecting the tab 101 to the side of the connecting piece 14 facing the composite pole 13, the tab 101 is exposed to the outside when connecting the tab 101 to the composite pole 13, thereby facilitating welding of the tab 101 and the connecting piece 14, reducing the difficulty of the welding operation and improving the welding efficiency.

[0060] Alternatively, as Figure 1 、 Figure 3 As shown, the housing assembly 1 further includes a seal 15, which is disposed in the receiving groove 1113 and is sandwiched between the pole body 131 and the first wall 1111. By disposing the seal 15 between the composite pole 13 and the first wall 1111, the gap between the composite pole 13 and the housing body 111 is filled and sealed to prevent leakage of the electrolyte.

[0061] Alternatively, as Figure 1As shown, the protective plate assembly 2 further includes a bottom supporting plate 22. The outer side of the electrode assembly 100 is covered with an insulating film 200. The bottom supporting plate 22 is provided on the surface of the electrode assembly 100 opposite to the electrode tab 101 and is heat-fused to the insulating film 200. By heat-fusion bonding the bottom supporting plate 22 to the insulating film 200, when the insulating film 200 is coated on the electrode assembly 100, the bottom supporting plate 22 can cover the surface of the electrode assembly 100 opposite to the electrode tab 101. The bottom supporting plate 22 protects the surface of the electrode assembly 100 opposite to the electrode tab 101 when the bottom sealing plate 12 is welded to the composite housing 11.

[0062] In this embodiment, if Figure 1 As shown, a battery is also provided, comprising an electrode assembly 100 and the aforementioned battery housing, wherein the electrode assembly 100 is disposed within the battery housing. By utilizing the aforementioned battery housing, the battery reduces the need for additional space, expands the space available for the electrode assembly 100, and increases the volume of the electrode assembly 100, thereby achieving not only a higher energy density but also a stronger power supply capability.

[0063] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A battery housing, wherein the battery housing is used to accommodate an electrode group, characterized in that: The battery housing comprises: A shell assembly, comprising a composite shell, a bottom sealing plate, and a composite pole; the composite shell is a hollow shell structure with a single-side opening; the bottom sealing plate is provided at the opening of the composite shell to form an accommodating cavity for accommodating the pole group; the pole group located in the accommodating cavity is provided with a pole lug; a first penetrating structure for extending the pole lug is provided on a wall surface of the composite shell opposite to the bottom sealing plate; and a first insulating layer for isolating the composite shell from the pole lug is injection-molded on the wall surface; the composite pole is provided outside the wall surface of the composite shell having the first penetrating structure, and realizes current conduction with the pole lug; A protective plate group, the protective plate group includes a protective end plate, the protective end plate is located in the accommodating cavity, and is provided on the side of the pole group extending out of the pole ear, the protective end plate is provided with a second penetrating structure connected to the first penetrating structure, the pole ear passes through the second penetrating structure and the first penetrating structure in sequence to achieve current conduction with the composite pole.

2. The battery housing according to claim 1, wherein: A shaping structure corresponding to the second penetrating structure is provided on one side of the protective end plate facing the pole group. The shaping structure is a trumpet-shaped structure whose opening gradually shrinks in a direction away from the pole group.

3. The battery housing according to claim 1, wherein: The composite housing comprises: A housing body, the housing body comprising a first wall surface and a plurality of second walls perpendicular to the first wall surface, the plurality of second walls being arranged around the periphery of the first wall surface to form a hollow shell structure open on one side, the first wall surface being provided with a receiving groove and a plug-in through-hole, the plug-in through-hole being provided in the receiving groove; The first insulating layer is injection molded on the first wall surface and includes an upper insulating portion, a lower insulating portion and a plug-in portion. The upper insulating portion is provided on the side of the first wall surface facing away from the pole group and is located in the accommodating groove. The lower insulating portion is provided on the side of the first wall surface facing the pole group and is located between the first wall surface and the protective end plate. The plug-in portion is inserted in the plug-in through hole and is used to connect the upper insulating portion and the lower insulating portion. The first penetrating structure penetrates the upper insulating portion, the plug-in portion and the lower insulating portion and is connected to the second penetrating structure.

4. The battery housing according to claim 3, wherein: The upper insulating portion is provided with a mounting boss protruding in a direction away from the pole group, and a mounting groove is provided on the mounting boss. The shell assembly also includes a connecting piece, which is arranged in the mounting groove. The pole ear passing through the first through-structure is connected to the connecting piece, and the connecting piece is connected to the composite pole.

5. The battery housing according to claim 3, wherein: A limiting groove is provided on a side of the protective end plate facing away from the pole group, and the lower insulating portion is embedded in the limiting groove.

6. The battery housing according to claim 4, wherein: The composite pole includes a pole body, a welding ring and a second insulating layer. The second insulating layer is injection-molded between the pole body and the welding ring to insulate and connect the pole body and the welding ring into one. The welding ring is welded in the accommodating groove, and the pole body is connected to the connecting piece.

7. The battery housing according to claim 6, wherein: A connecting boss is provided on one side of the connecting piece facing the pole body and is raised close to the pole body, and the pole body is welded to the connecting boss.

8. The battery housing according to claim 6, wherein: The housing assembly further includes a sealing member, which is disposed in the accommodating groove and sandwiched between the pole body and the first wall surface.

9. The battery housing according to claim 1, wherein: The protective plate group also includes a bottom supporting plate. The outer side of the electrode group is covered with an insulating film. The bottom supporting plate is arranged on the surface of the electrode group opposite to the electrode tab and is thermally melted to the insulating film.

10. A battery, characterized in that The battery comprises a pole group and a battery casing according to any one of claims 1 to 9, wherein the pole group is arranged in the battery casing.

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