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 body, a cover plate module, a composite cover plate, a composite pole and a protective end plate, the cover plate module comprises a first cover plate body and a connecting pole penetrating through the first cover plate body, the composite cover plate is provided with a penetrating structure for the pole lug to extend out, the composite pole column is arranged on one side, deviating from the cover plate module, of the composite cover plate, the pole lug extending out of the accommodating cavity realizes current conduction through the composite pole column, and the protective end plate is provided with an avoiding through hole for the pole lug to penetrate through. The tab on one side and the composite pole located on the outer side of the containing cavity achieve current conduction through the penetrating structure, the space occupied by the composite pole and the space for connecting the bent tab and the composite pole are saved, the space utilization rate is increased, space is provided for increasing the size of the pole set, the energy density is increased, and the service life of the pole set is prolonged. And the pole lug is prevented from skewing during passing through the protection end plate, so that the reliability of the structure is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a battery shell and battery. BACKGROUND

[0002] For the blade battery, the blade battery shell and the pole group are indispensable structures of the blade battery, wherein the pole group and the blade battery shell jointly constitute a complete battery. The pole group is the core component of the battery, responsible for storing and releasing electric energy, and is mainly composed of positive electrode material, negative electrode material, electrolyte and separator. The pole group is the smallest unit of the power battery and is also an electric energy storage unit, which must have a high energy density to store as much electric energy as possible; the blade battery shell is a container wrapping the pole group, which not only provides physical protection to prevent the pole group from being affected by the external environment, but also helps the pole group dissipate heat and maintain the stability of the battery. Therefore, the performance of the battery shell has an important influence on the assembly, safety and performance of the battery.

[0003] Among them, since the pole group of the blade battery is in the form of two side tabs, the traditional blade battery shell usually includes a shell body and two cover plate assemblies respectively connected with the tabs, the cover plate assembly mainly includes a pole, a welding platform, a cover plate body, an upper plastic and a lower plastic, etc. The two cover plate assemblies are used to close the openings on both sides of the shell body to form a chamber for storing the pole group, wherein the tabs are connected with the poles of the cover plate assembly after being bent inside the chamber and extending into the chamber, so as to realize the conduction of the pole group current.

[0004] The blade battery of this structure needs to extend a part of the poles of the two side cover plate assemblies into the inside of the chamber and weld with the tabs bent inside the chamber. On the one hand, a large amount of space needs to be reserved in the chamber for placing the pole group, resulting in a large amount of wasted space and low space utilization. On the other hand, the space available for the pole group is greatly compressed, limiting the volume of the pole group and resulting in a low energy density. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a battery shell and battery with high space utilization, large energy density and strong structural reliability.

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

[0007] On the one hand, a battery shell is provided, which comprises:

[0008] A shell body, which is a hollow shell structure with openings on both sides;

[0009] A cover plate module, the cover plate module comprising a first cover plate body and a connecting pole, the first cover plate body being used to close an opening on one side of the housing body, the connecting pole being provided through the first cover plate body, one end of the connecting pole being located outside the housing body, and the other end of the connecting pole being located inside the housing body;

[0010] a composite cover plate, the composite cover plate being provided with a through structure and being used to close the opening on the other side of the shell body; the composite cover plate, the shell body, and the first cover plate body together forming an accommodating cavity for accommodating the electrode group; the electrode tab on one side of the electrode group located in the accommodating cavity is connected to the portion of the connecting electrode located in the shell body; the electrode tab on the other side of the electrode group extends out of the through structure;

[0011] A composite pole, the composite pole being arranged on a side of the composite cover plate away from the cover plate module, and the pole lug extending out of the accommodating cavity realizes current conduction through the composite pole;

[0012] At least one protective end plate is provided in the accommodating cavity. The protective end plate is provided on a side of the pole group extending from the pole ear and is provided with an avoidance through-hole for the pole ear to pass through.

[0013] Optionally, a shaping structure corresponding to the avoidance through-holes is provided on a side of the protective end plate facing the pole group, and the shaping structure is a trumpet-shaped structure whose opening gradually shrinks in a direction away from the pole group.

[0014] Optionally, the protective end plate further includes a plurality of weight-reducing structures, and the plurality of weight-reducing structures penetrate the protective end plate.

[0015] Optionally, the composite cover plate includes:

[0016] a second cover body, the second cover body being connected to the opening of the shell body, and a receiving groove for accommodating the composite pole and a plug-in through hole located in the receiving groove being formed on a side of the second cover body facing away from the pole group;

[0017] A first insulating member, comprising an upper insulating portion, a lower insulating portion and a plug-in portion, wherein the upper insulating portion is disposed on a side of the second cover body facing away from the pole group and is accommodated in the accommodating groove, and the lower insulating portion is disposed on a side of the second cover body facing the pole group, 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, and the through structure penetrates the upper insulating portion, the plug-in portion and the lower insulating portion.

[0018] Optionally, the battery shell further comprises a connecting piece, the upper insulating part is provided with a mounting boss protruding away from the direction of the pole group, a mounting groove is formed on the side of the mounting boss away from the pole group, and the connecting piece is arranged in the mounting groove and connected with the connecting piece and the pole lug of the through structure.

[0019] Optionally, the composite pole post comprises a pole post body, a welding ring and a second insulating piece, the second insulating piece is injection molded between the pole post body and the welding ring, so as to insulate and connect the pole post body and the welding ring into one body, and the pole post body is connected with the connecting piece.

[0020] Optionally, the side of the connecting piece facing the pole post body is provided with a connecting boss protruding towards the pole post body, and the pole post body is connected with the connecting boss.

[0021] Optionally, the battery shell further comprises a sealing piece arranged in the accommodating groove and clamped between the pole post body and the second cover body.

[0022] Optionally, the battery shell further comprises an insulating protective film and at least one protective side plate connected to the insulating protective film, and the insulating protective film covers the surface of the pole group without the pole lug.

[0023] In another aspect, a battery is provided, comprising a pole group and the battery shell as claimed in any one of the preceding aspects, and the pole group is arranged in the battery shell.

[0024] The battery shell has the following beneficial effects:

[0025] The battery shell provided by the utility model has the following beneficial effects: the through structure is arranged on the composite cover plate, the pole lug on one side of the pole group can be connected with the composite pole post outside the accommodating cavity to realize current conduction, the space occupied by the connection between the pole lug and the composite pole post and the space occupied by the composite pole post extending into the accommodating cavity are saved, the utilization rate of the space is improved, the space for increasing the pole group is provided, the energy density is improved, the protective end plate with the avoiding through hole is arranged on the side of the pole group provided with the pole lug, the pole lug is folded and supported when extending out, the pole lug is prevented from being skewed, and the reliability of the structure is ensured.

[0026] The battery is assembled by using the battery assembling method, the volume of the pole group is further increased, the energy density of the battery is improved, and the power supply capacity of the battery is increased. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 This is an exploded view of the structure of the battery provided by the utility model;

[0028] Figure 2 This is a partial structural cross-sectional view of the composite cover plate in the battery provided by the present invention;

[0029] Figure 3 This is an assembly diagram of the cover module in the battery housing provided by the present invention;

[0030] Figure 4 This is a structural cross-sectional view of the cover module in the battery housing provided by the utility model;

[0031] Figure 5 This is a structural diagram of the second cover body in the battery housing provided by the present invention;

[0032] Figure 6 This is a structural diagram of the first insulating member in the battery housing provided by the present utility model;

[0033] Figure 7 This is a structural diagram of the front side of the protective end plate in the battery housing provided by the present invention;

[0034] Figure 8 It is a structural schematic diagram of the back side of the protective end plate in the battery housing provided by the present invention.

[0035] In the picture:

[0036] 100, pole group; 101, pole ear;

[0037] 1. Shell body;

[0038] 2. Cover plate module; 21. First cover plate body; 22. Connecting pole; 23. Lower plastic; 24. Upper plastic; 25. Sealing ring; 26. Soldering station;

[0039] 3. Composite cover plate; 31. Second cover plate body; 311. Accommodating groove; 312. Insertion through hole; 32. First insulating member; 321. Upper insulating portion; 3211. Mounting boss; 3212. Mounting groove; 322. Lower insulating portion; 323. Insertion portion; 324. Through-hole structure;

[0040] 4. Composite pole; 41. Pole body; 42. Welding ring; 43. Second insulating member;

[0041] 5. Protective end plate; 51. Avoidance through hole; 52. Plastic structure; 53. Weight reduction structure;

[0042] 6. Connecting piece; 61. Connecting boss;

[0043] 7. Seals;

[0044] 8. An insulating protective film;

[0045] 9. A protective side plate. DETAILED DESCRIPTION

[0046] The utility model will be further explained in detail below in combination with the drawings and examples. It can be understood that the specific examples described herein are only used to explain the utility model and are not limited to the utility model. In addition, it should be noted that only the parts related to the utility model are shown in the drawings for ease of description, not all the structures.

[0047] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0048] In the utility model, unless otherwise explicitly specified and limited, the first feature "on" or "below" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0049] In the description of the embodiment, the terms "up", "down", "right", etc. orientation or position relationship is based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0050] Due to the traditional blade battery structure, not only the space for bending the tab is reserved inside, but also the space for the pole of the cover plate assembly to extend into the chamber is reserved, on the one hand, a large amount of space needs to be reserved in the chamber for placing the pole group, resulting in a large amount of space being wasted, low space utilization, on the other hand, the space available for the pole group is greatly compressed, limiting the volume of the pole group, resulting in low energy density.

[0051] Therefore, in order to reduce the waste of space, improve the utilization of space, increase the volume of the electrode group, and improve the energy density, this embodiment provides a battery housing.

[0052] like Figures 1 to 8 As shown, the battery shell includes a shell body 1, a cover module 2, a composite cover 3, a composite pole 4 and at least one protective end plate 5. The shell body 1 is a hollow shell structure with two open sides. The cover module 2 includes a first cover body 21 and a connecting pole 22. The first cover body 21 is used to close the opening on one side of the shell body 1. The connecting pole 22 is penetrated on the first cover body 21. One end of the connecting pole 22 is located outside the shell body 1, and the other end of the connecting pole 22 is located inside the shell body 1. A through structure 324 is provided on the composite cover 3, which is used to close the opening on the other side of the shell body 1. The composite cover 3, the outer The shell body 1 and the first cover plate body 21 together constitute an accommodating cavity for accommodating the pole group 100. The pole ear 101 on one side of the pole group 100 located in the accommodating cavity is connected to the part of the connecting pole 22 located in the shell body 1. The pole ear 101 on the other side of the pole group 100 extends out of the through structure 324. The composite pole 4 is arranged on the side of the composite cover plate 3 away from the cover plate module 2. The pole ear 101 extending out of the accommodating cavity realizes current conduction through the composite pole 4. At least one protective end plate 5 is provided in the accommodating cavity. The protective end plate 5 is provided on the side of the pole ear 101 extending out of the pole group 100 and is provided with an avoidance through-hole 51 for the pole ear 101 to pass through.

[0053] By providing a through structure 324 on the composite cover plate 3 for the extension of the pole ear 101 on one side of the pole group 100, the pole ear 101 on one side of the pole group 100 can achieve current conduction with the composite pole 4 located outside the accommodating cavity by extending out of the accommodating cavity. On the one hand, this not only saves the space occupied by the connection between the pole ear 101 on this side and the composite pole 4 and the extension of the composite pole 4 into the accommodating cavity, but also reduces the occupation of the internal space and improves the utilization of the space. On the other hand, it provides space for increasing the pole group 100, thereby improving the energy density. In addition, a protective end plate 5 with an avoidance through hole 51 is provided on the side of the pole group 100 where the pole ear 101 is provided, so as to provide support for the pole ear 101 when it is extended, thereby preventing the pole ear 101 from tilting and ensuring the reliability of the structure.

[0054] The number of protective end plates 5 can be set to one or two, and can be adjusted according to different protection requirements. In this embodiment, a protective end plate 5 for clamping and fixing is provided on both the positive ear side and the negative ear side. The number of electrode groups 100 accommodated in the accommodating cavity of batteries of different specifications and models is different. Therefore, the avoidance through-holes 51 opened on the protective end plate 5 are consistent with the number of electrode groups 100 in the accommodating cavity, so as to protect the electrode ears 101 of each electrode group 100 and ensure the reliability of the structure. In addition, by providing protective end plates 5 on both sides of the electrode group 100, double-sided protection can be achieved when the electrode group 100 is placed in the shell, thereby avoiding damage to the electrode group 100 when entering the shell.

[0055] In this embodiment, if Figure 3 、 Figure 4 As shown, the cover module 2 is a traditional welding cover, which includes, in addition to the first cover body 21 and the connecting pole 22, a lower plastic 23, an upper plastic 24, a sealing ring 25 and a welding platform 26, wherein the upper plastic 24 is bonded to the side of the first cover body 21 away from the pole group 100, and the welding platform 26 is provided on the side of the upper plastic 24 away from the first cover body 21, and the lower plastic 23 is bonded to the side of the first cover body 21 facing the pole group 100. At the same time, the connecting pole 22 includes a column portion and a limiting portion. The column portion is inserted through the lower plastic 23, the first cover body 21 and the upper plastic 24 in sequence, inserted into the welding platform 26, and welded to the welding platform 26. The lower plastic 23 is sandwiched between the limiting portion and the first cover body 21, and the upper plastic 24 is sandwiched between the first cover body 21 and the welding platform 26. The upper plastic 24 and the lower plastic 23 provide insulation protection for both sides of the first cover body 21. The sealing ring 25 is sleeved on the column part to seal the gap when the column part passes through the lower plastic 23, the first cover body 21 and the upper plastic 24.

[0056] The type of the cover plate module 2 is not limited to the traditional welded cover plate. In other embodiments, the cover plate module 2 can also be a traditional riveted cover plate or a traditional minimalist cover plate.

[0057] Alternatively, as Figure 7 、 Figure 8 As shown, a shaping structure 52 corresponding to the avoidance through-hole 51 is provided on the side of the protective end plate 5 facing the pole group 100 . The shaping structure 52 is a trumpet-shaped structure with its opening gradually shrinking in the direction away from the pole group 100 .

[0058] By providing a shaping structure 52 on the side of the protective end plate 5 facing the electrode group 100, and making the shaping structure 52 into a trumpet-shaped shape with an opening gradually narrowing in the direction away from the electrode group 100, the multiple converged pole ears 101 on the electrode group 100 can be better supported and fixed, and the convergence state of each pole ear 101 can be improved, thereby avoiding the problem of short circuit inside the battery due to poor convergence effect of the pole ear 101.

[0059] In this embodiment, the protective end plate 5 is a plastic part made by injection molding. On the one hand, since its material is relatively soft, it can avoid hard contact with the pole ear 101, causing damage to the pole ear 101. On the other hand, since it also has insulating properties, it improves the insulation protection effect.

[0060] Alternatively, as Figure 7 、 Figure 8 As shown, the protective end plate 5 also includes multiple weight-reducing structures 53, which extend through the protective end plate 5. The weight-reducing structures 53 reduce the weight of the protective end plate 5, thereby meeting lightweight design requirements. In this embodiment, the weight-reducing structures 53 are through-holes extending through the protective end plate 5.

[0061] Optionally, Figure 1 、 Figure 2 、 Figure 5 、 Figure 6 As shown, the composite cover 3 includes a second cover body 31 and a first insulating member 32. The second cover body 31 is connected to the open part of the shell body 1. A receiving groove 311 for accommodating the composite pole 4 and a plug-in through-hole 312 located in the receiving groove 311 are provided on the side of the second cover body 31 facing away from the pole group 100. The first insulating member 32 includes an upper insulating portion 321, a lower insulating portion 322 and a plug-in portion 323. The upper insulating portion 321 is provided on the side of the second cover body 31 facing away from the pole group 100 and is accommodated in the receiving groove 311. The lower insulating portion 322 is provided on the side of the second cover body 31 facing the pole group 100. The plug-in portion 323 is inserted in the plug-in through-hole 312 and is used to connect the upper insulating portion 321 and the lower insulating portion 322. The through-structure 324 passes through the upper insulating portion 321, the plug-in portion 323 and the lower insulating portion 322.

[0062] By setting a first insulating member 32 consisting of an upper insulating portion 321, a lower insulating portion 322 and a plug-in portion 323, and making the upper insulating portion 321 arranged on the side of the second cover body 31 away from the pole group 100, and the lower insulating portion 322 arranged on the side of the second cover body 31 facing the pole group 100, and the plug-in portion 323 inserted into the plug-in through-hole 312, the first insulating member 32 is used to insulate and protect both sides of the second cover body 31 and the inside of the plug-in through-hole 312, and isolate the pole ear 101 from the second cover body 31, so as to avoid the pole ear 101 passing through the protective end plate 5 and directly contacting the second cover body 31 when extending through the second cover body 31 to the outside of the accommodating cavity, resulting in a short circuit, and the first insulating member 32 and the protective end plate 5 cooperate with each other to increase the insulation protection area, further improve the insulation protection performance of the pole ear 101, and ensure the reliability of the structure.

[0063] In this embodiment, the second cover body 31 is a plain aluminum plate, and the first insulating member 32 is a plastic part directly molded onto the second cover body 31 using an injection molding process. Compared to traditional cover assemblies, the separate lower insulating member is eliminated, thereby reducing the number of parts and simplifying the assembly process. Furthermore, in this embodiment, the upper insulating portion 321, the plug portion 323, and the lower insulating portion 322 are a one-piece structural member formed simultaneously through the injection molding process. In other embodiments, the upper insulating portion 321, the plug portion 323, and the lower insulating portion 322 can also be separately injection molded and then plugged into each other, making the first insulating member 32 a split structural member.

[0064] Alternatively, as Figure 1 、 Figure 2 、 Figure 6 As shown, the battery housing also includes a connecting piece 6, and the upper insulating portion 321 is provided with a mounting boss 3211 protruding in the direction away from the electrode group 100. A mounting groove 3212 is provided on the side of the mounting boss 3211 away from the electrode group 100. The connecting piece 6 is arranged in the mounting groove 3212, and the pole ear 101 passing through the through structure 324 is connected to the connecting piece 6, and the connecting piece 6 is connected to the composite pole 4.

[0065] By providing the connecting piece 6 and first connecting the tab 101 to the connecting piece 6 and then connecting the connecting piece 6 to the composite pole 4, not only is the welding operation convenient, but the connecting piece 6 is also used to fix the position of the tab 101 in advance, ensuring the accuracy of the position of the tab 101 during subsequent operations, and preventing the tab 101 from moving and affecting the current conduction effect between the tab 101 and the composite pole 4. In addition, the mounting groove 3212 on the mounting boss 3211 limits the position of the connecting piece 6 accommodated therein, thereby ensuring the accuracy of the position of the connecting piece 6.

[0066] In this embodiment, the shape of the mounting groove 3212 is adapted to the shape of the connecting piece 6 . The shape of the connecting piece 6 can be circular, elliptical or polygonal, etc. The specific shape is adjusted based on the convenience of welding with the tab 101 .

[0067] Alternatively, as Figure 1 、 Figure 3 As shown, the composite pole 4 includes a pole body 41 , a welding ring 42 and a second insulating member 43 . The second insulating member 43 is injection-molded between the pole body 41 and the welding ring 42 to insulate and connect the pole body 41 and the welding ring 42 into one piece. The pole body 41 is connected to the connecting piece 6 .

[0068] By injection molding the second insulating member 43 between the pole body 41 and the welding ring 42, the pole body 41 and the welding ring 42 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 member 43 is a plastic member formed by an injection molding process, an insulated connection between the pole body 41 and the welding ring 42 is achieved, which has high insulation protection performance and avoids the pole body 41 from being connected to the shell body 1 through the welding ring 42, thereby preventing the problem of short circuit.

[0069] In this embodiment, the pole body 41 is made of different materials according to the polarity of the pole ear 101. When the pole body 41 is connected to the positive pole ear, the pole body 41 is made of pure aluminum. When the pole body 41 is connected to the negative pole ear, the pole body 41 is made of a copper-aluminum composite material. Compared with the pole body 41 made of pure copper, the production cost of the pole body 41 connected to the negative pole ear is effectively reduced.

[0070] Alternatively, as Figure 2 As shown, the side of the connecting piece 6 facing the pole body 41 is provided with a connecting boss 61 that protrudes along the side close to the pole body 41, and the pole body 41 is connected to the connecting boss 61. The provision of the connecting boss 61 on the side of the connecting piece 6 facing the pole body 41 facilitates welding of the connecting piece 6 to the pole body 41. The size and shape of the connecting boss 61 can be freely set according to needs, as long as there is sufficient welding area between the connecting boss 61 and the pole body 41. In this embodiment, the connecting boss 61 is a frustum.

[0071] In addition, the connecting piece 6 is made of different materials according to the different polarities of the electrode tab 101. When the connecting piece 6 is connected to the positive electrode tab, the connecting piece 6 is made of pure aluminum. When the connecting piece 6 is connected to the negative electrode tab, the connecting piece 6 is made of copper-aluminum composite material. Compared with the connecting piece 6 made of pure copper, the manufacturing cost of the connecting piece 6 connected to the negative electrode tab is effectively reduced.

[0072] The pole ear 101 connected to the connecting piece 6 can be connected to the side of the connecting piece 6 facing the pole group 100, or can be connected to the side of the connecting piece 6 facing away from the pole group 100. When the pole ear 101 is connected to the side of the connecting piece 6 facing the pole group 100, the length of the pole ear 101 can be effectively shortened, thereby improving the efficiency of current transmission; when the pole ear 101 is connected to the side of the connecting piece 6 facing away from the pole group 100, the pole ear 101 is exposed to the outside, thereby facilitating the welding operation between the pole ear 101 and the connecting piece 6, reducing the difficulty of the welding operation, and improving the efficiency of welding.

[0073] Alternatively, as Figure 1 、 Figure 2 、 Figure 5 As shown, the battery housing further includes a seal 7, which is disposed within the receiving groove 311 and sandwiched between the electrode body 41 and the second cover body 31. By disposing the seal 7 within the receiving groove 311 and sandwiched between the electrode body 41 and the second cover body 31, the gap between the electrode body 41 and the second cover body 31 can be filled and sealed to prevent leakage of the electrolyte. In this embodiment, the seal 7 is made of rubber.

[0074] Alternatively, as Figure 1 、 Figure 2 As shown, the battery housing further includes an insulating protective film 8 and at least one protective side plate 9 connected to the insulating protective film 8. The insulating protective film 8 covers the surface of the electrode group 100 that is not provided with the electrode tab 101. By covering the surface of the electrode group 100 that is not provided with the electrode tab 101 with the insulating protective film 8 connected to the at least one protective side plate 9, the surface of the electrode group 100 that is not provided with the electrode tab 101 is protected.

[0075] In this embodiment, the insulating protective film 8 is a polyester film, and the number of protective side plates 9 can be one, two, three, or four. The specific number is adjusted according to the different protection requirements. In this embodiment, a total of four protective side plates 9 are provided. Before the electrode assembly 100 is coated with the polyester film, the four protective side plates 9 are first heat-fused onto the polyester film. When the polyester film is coated on the electrode assembly 100, the electrode assembly 100 is protected on all four sides, preventing damage to the electrode assembly 100 when it is placed in the shell, which would reduce the product yield. The shape of the protective side plates 9 is adapted to the surface of the electrode assembly 100 that is not provided with the electrode tabs 101.

[0076] 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 assembling the battery using the aforementioned battery assembly method, the volume of the electrode assembly 100 is further increased, thereby improving the battery's energy density and increasing the battery's power supply capacity.

[0077] 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, characterized in that: The battery housing comprises: The outer shell body is a hollow shell structure with two sides open; A cover plate module, the cover plate module comprising a first cover plate body and a connecting pole, the first cover plate body being used to close an opening on one side of the housing body, the connecting pole being provided through the first cover plate body, one end of the connecting pole being located outside the housing body, and the other end of the connecting pole being located inside the housing body; a composite cover plate, the composite cover plate being provided with a through structure and being used to close the opening on the other side of the shell body; the composite cover plate, the shell body, and the first cover plate body together forming an accommodating cavity for accommodating the electrode group; the electrode tab on one side of the electrode group located in the accommodating cavity is connected to the portion of the connecting electrode located in the shell body; the electrode tab on the other side of the electrode group extends out of the through structure; A composite pole, the composite pole being arranged on a side of the composite cover plate away from the cover plate module, and the tab extending out of the accommodating cavity realizes current conduction through the composite pole; At least one protective end plate is provided in the accommodating cavity. The protective end plate is provided on a side of the pole group extending from the pole ear and is provided with an avoidance through-hole for the pole ear to pass through.

2. The battery housing according to claim 1, wherein: A shaping structure corresponding to the avoidance through-holes 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 protective end plate further includes a plurality of weight-reducing structures, and the plurality of weight-reducing structures penetrate through the protective end plate.

4. The battery housing according to claim 1, wherein: The composite cover plate comprises: a second cover body, the second cover body being connected to the opening of the shell body, and a receiving groove for accommodating the composite pole and a plug-in through hole located in the receiving groove being formed on a side of the second cover body facing away from the pole group; A first insulating member, comprising an upper insulating portion, a lower insulating portion and a plug-in portion, wherein the upper insulating portion is disposed on a side of the second cover body facing away from the pole group and is accommodated in the accommodating groove, and the lower insulating portion is disposed on a side of the second cover body facing the pole group, 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, and the through structure penetrates the upper insulating portion, the plug-in portion and the lower insulating portion.

5. The battery housing according to claim 4, wherein: The battery casing also includes a connecting piece. The upper insulating portion is provided with a mounting boss protruding in a direction away from the pole group. A mounting groove is provided on the side of the mounting boss away from the pole group. The connecting piece is arranged in the mounting groove. The pole ear passing through the through structure is connected to the connecting piece, and the connecting piece is connected to the composite pole.

6. The battery housing according to claim 5, characterized in that The composite pole includes a pole body, a welding ring and a second insulating member. The second insulating member 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 pole body is connected to the connecting piece.

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

8. The battery housing according to claim 6, wherein: The battery housing further includes a sealing member, which is disposed in the receiving groove and is sandwiched between the pole body and the second cover body.

9. The battery housing according to claim 1, wherein: The battery housing further comprises an insulating protective film and at least one protective side plate connected to the insulating protective film, wherein the insulating protective film covers the surface of the electrode group where the electrode lug is not provided.

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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