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 composite shell, a cover plate module, a composite pole post and a protective end plate, the composite shell is provided with a penetrating structure, the cover plate module comprises a cover plate body and a connecting pole post, the connecting pole post penetrates through the cover plate body to be connected with a tab, and the protective end plate is connected with the composite pole post. And the tab extending out of the accommodating cavity realizes current conduction through a composite pole arranged on the outer side of the accommodating cavity. The tab on one side extends out of the accommodating cavity to realize current conduction with the composite pole, so that the space occupied by the composite pole and the bending connection space of the tab are saved, the space utilization rate is improved, the space is provided for increasing the volume of the pole group, the energy density is improved, and the protection end plate for preventing the tab from skewing during passing is arranged; and in addition, the structural form that the composite shell with the opening in the single side is matched with the single cover plate module is adopted, so that the welding operation amount of the tab on one side is reduced, and the electrical performance and the mechanical performance of the tab on the side are 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, and the cover plate assembly mainly includes a pole, a welding table, 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 bent inside the chamber and connected with the poles inside the chamber, thereby realizing the conduction of the pole group current.

[0004] The structure of the blade battery on one hand occupies a large amount of space inside the chamber due to the part of the pole of the two side cover plate assemblies extending into the chamber and being welded with the tabs bent inside the chamber, greatly compressing the space available for the pole group, resulting in low space utilization and energy density; on the other hand, the tabs on both sides of the pole group need to be welded with the cover plate body and the battery shell, the welding table and the cover plate body, and the welding table and the pole, so that the tabs collect a large amount of welding work, and the high temperature generated by a large amount of welding work will change the microstructure of the tab material, thereby affecting its electrical and mechanical properties, increasing the resistance of the tab, and affecting the discharge performance and cycle life of the blade battery. 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] The composite shell is a single-side open hollow shell structure, and a through structure for the tab of the pole group to extend out is arranged on the wall opposite to the open side of the composite shell.

[0009] The cover plate module comprises a cover plate body and a connecting pole. The cover plate body is arranged at the open side of the composite shell and seals the composite shell to form a containing cavity containing the pole group. The connecting pole is arranged on the cover plate body, one end of the connecting pole is located outside the containing cavity, and the other end of the connecting pole is located inside the containing cavity and connected with the tab on the other side of the pole group.

[0010] The composite pole is arranged on the side of the composite shell away from the cover plate module, and the tab extending out of the containing cavity realizes the conduction of current through the composite pole.

[0011] At least one protective end plate is arranged in the containing cavity, and the protective end plate is arranged on the side of the pole group extending out of the tab and is provided with an avoiding through hole for the tab to pass through.

[0012] Optionally, the protective end plate is provided with a shaping structure corresponding to the avoiding through hole on the side facing the pole group, and the shaping structure is a horn type with an opening gradually narrowing away from the pole group.

[0013] Optionally, the protective end plate further comprises a plurality of weight-reducing structures penetrating the protective end plate.

[0014] Optionally, the composite shell comprises:

[0015] The shell body comprises a first wall and a plurality of second walls perpendicular to the first wall. The plurality of second walls are arranged around the periphery of the first wall to form a single-side open hollow shell structure. The first wall is provided with a containing groove for accommodating the composite pole and a plug-in through hole in the containing groove.

[0016] The first insulation piece comprises an upper insulation part, a lower insulation part and a plug-in part. The upper insulation part is arranged on the side of the first wall away from the pole group and accommodated in the containing groove. The lower insulation part is arranged on the side of the first wall facing the pole group. The plug-in part is inserted into the plug-in through hole and used to connect the upper insulation part and the lower insulation part. The through structure penetrates the upper insulation part, the plug-in part and the lower insulation part.

[0017] 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.

[0018] 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 to insulate and connect the pole post body and the welding ring as a whole, and the pole post body is connected with the connecting piece.

[0019] 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.

[0020] Optionally, the battery shell further comprises a sealing piece arranged in the accommodating groove and clamped between the pole post body and the shell body.

[0021] 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.

[0022] In another aspect, a battery is provided, which comprises 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.

[0023] The battery shell has the following beneficial effects:

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

[0025] The application also provides a battery, which is assembled by the battery assembling method, so that the volume of the pole group is further increased, the energy density of the battery is improved, the power supply capacity of the battery is increased, and the discharge performance and cycle life of the overall battery are improved due to the improved influence of the welding operation on the tab. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a structural exploded view of the battery provided by the application;

[0027] Figure 2 is a partial structural sectional view of the first wall surface of the composite shell in the battery provided by the application;

[0028] Figure 3 is an assembly drawing of the cover plate module in the battery shell provided by the application;

[0029] Figure 4 is a structural sectional view of the cover plate module in the battery shell provided by the application;

[0030] Figure 5 is a structural schematic view of the shell body in the battery shell provided by the application;

[0031] Figure 6 is a structural schematic view of the first insulating part in the battery shell provided by the application;

[0032] Figure 7 is a structural schematic view of the front surface of the protective end plate in the battery shell provided by the application;

[0033] Figure 8 is a structural schematic view of the back surface of the protective end plate in the battery shell provided by the application.

[0034] In the drawings:

[0035] 100, pole group; 101, tab;

[0036] 1, composite shell; 11, shell body; 111, first wall surface; 112, second wall surface; 113, accommodating groove; 114, plug-in through hole; 12, first insulating part; 121, upper insulating part; 1211, mounting boss; 1212, mounting groove; 122, lower insulating part; 123, plug-in part; 124, through structure;

[0037] 2, cover plate module; 21, cover plate body; 22, connecting pole; 23, lower plastic; 24, upper plastic; 25, sealing ring; 26, welding table;

[0038] 3, composite pole; 31, pole body; 32, welding ring; 33, second insulating part;

[0039] 4, protection end plate; 41, avoiding through hole; 42, shaping structure; 43, weight-reducing structure;

[0040] 5, connecting piece; 51, connecting boss;

[0041] 6, sealing element;

[0042] 7, insulation protection film;

[0043] 8, protection side plate. DETAILED DESCRIPTION

[0044] The utility model will be described in further detail below in combination with the drawings and examples. It can be understood that the specific examples described here are only used to explain the utility model, and not to limit 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.

[0045] 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.

[0046] 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.

[0047] 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 it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only used to distinguish in description, and have no special meaning.

[0048] 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, which not only leads to a large amount of space being wasted and low space utilization, but also limits the volume of the pole group, resulting in low energy density, and on the other hand, a large amount of welding operation is required on both sides of the pole group, so that the high temperature generated by the welding operation causes the microstructure of the tab material to change, thereby affecting its electrical and mechanical properties, resulting in an increase in the resistance of the tab, thereby affecting the discharge performance and cycle life of the blade battery.

[0049] Therefore, in order to reduce the waste of space, improve the utilization of space, increase the energy density of the pole group, and improve the influence of welding operation on the microstructure of the tab, the embodiment provides a battery shell.

[0050] As shown in Figures 1 to 8 The battery shell includes a composite shell 1, a cover plate module 2, a composite pole 3, and at least one protective end plate 4. The composite shell 1 is a single-sided open hollow shell structure. The wall surface opposite to the open side of the composite shell 1 is provided with a through structure 124 for the tab 101 on one side of the pole group 100 to extend out. The cover plate module 2 includes a cover plate body 21 and a connecting pole 22. The cover plate body 21 is arranged at the opening of the composite shell 1 and closes the composite shell 1 to form a containing cavity for containing the pole group 100. The connecting pole 22 is arranged on the cover plate body 21. One end of the connecting pole 22 is located outside the containing cavity, and the other end of the connecting pole 22 is located inside the containing cavity and connected with the tab 101 on the other side of the pole group 100. The composite pole 3 is arranged on the side of the composite shell 1 away from the cover plate module 2. The tab 101 extending out of the containing cavity realizes the conduction of current through the composite pole 3. At least one protective end plate 4 is arranged in the containing cavity. The protective end plate 4 is arranged on the side of the pole group 100 extending out of the tab 101 and is provided with a avoiding through hole 41 for the tab 101 to pass through.

[0051] The through structure 124 is arranged on the composite shell 1, and the tab 101 of the pole group 100 on one side can extend out of the through structure 124. The tab 101 on one side of the pole group 100 can be in electrical conduction with the composite pole 3 outside the accommodation cavity through the extension of the accommodation cavity. Therefore, the space occupied by the connection between the tab 101 on one side and the composite pole 3 and the extension of the composite pole 3 into the accommodation cavity is saved, the internal space is reduced, the space utilization is improved, the space for increasing the pole group 100 is provided, the energy density is improved, and the protective end plate 4 provided with the avoiding through hole 41 is arranged on the side of the pole group 100 provided with the tab 101. Therefore, the tab 101 is folded and supported when it extends out, the tab 101 is prevented from being skewed, the reliability of the structure is ensured, and in addition, the structure of the single-sided open composite shell 1 combined with the single cover plate module 2 is adopted. The tab 101 on one side of the pole group 100 extending out of the through structure 124 of the composite shell 1 has less welding work amount, so that the influence of high temperature generated by welding work on the microstructure of the tab 101 on one side is reduced, the resistance of the tab 101 on one side is reduced, and the electrical performance and mechanical performance of the tab 101 on one side are improved.

[0052] The number of protective end plates 4 can be one or two, which is adjusted according to different protection requirements. In the embodiment, one protective end plate 4 is arranged on the positive tab side and the negative tab side for clamping and fixing. Different specifications of batteries have different numbers of pole groups 100 accommodated in the accommodation cavity, so the number of avoiding through holes 41 arranged on the protective end plate 4 is consistent with the number of pole groups 100 in the accommodation cavity, so as to protect the tab 101 of each pole group 100 and ensure the reliability of the structure. In addition, the protective end plates 4 arranged on both sides of the pole group 100 can also have the effect of double protection when the pole group 100 enters the shell, so as to avoid damage to the pole group 100 when it enters the shell.

[0053] In the embodiment, as shown in FIG. 1, Figure 3 , Figure 4As shown, the cover module 2 is a traditional welding cover, which includes, in addition to the 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 cover body 21 away from the pole group 100, the welding platform 26 is provided on the side of the upper plastic 24 away from the cover body 21, and the lower plastic 23 is bonded to the side of the 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 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 limit portion and the cover body 21, and the upper plastic 24 is sandwiched between the 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 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 cover body 21 and the upper plastic 24.

[0054] 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.

[0055] Alternatively, as Figure 7 、 Figure 8 As shown, a shaping structure 42 corresponding to the avoidance through-holes 41 is provided on the side of the protective end plate 4 facing the pole group 100 . The shaping structure 42 is a trumpet-shaped structure with its opening gradually shrinking in the direction away from the pole group 100 .

[0056] By providing a shaping structure 42 on the side of the protective end plate 4 facing the electrode group 100, and making the shaping structure 42 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.

[0057] In this embodiment, the protective end plate 4 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.

[0058] Alternatively, as Figure 7 、 Figure 8 As shown, the protective end plate 4 also includes multiple weight-reducing structures 43, which extend through the protective end plate 4. The weight-reducing structures 43 reduce the weight of the protective end plate 4, thereby meeting lightweight design requirements. In this embodiment, the weight-reducing structures 43 are through-holes extending through the protective end plate 4.

[0059] Optionally, as Figure 1 , Figure 2 , Figure 5 , Figure 6 shown, the composite shell 1 comprises a shell body 11 and a first insulating piece 12, the shell body 11 comprises a first wall surface 111 and a plurality of second wall surfaces 112 perpendicular to the first wall surface 111, the plurality of second wall surfaces 112 are annularly arranged on the circumferential side of the first wall surface 111 to form a single-sided open hollow shell structure, the first wall surface 111 is provided with a receiving groove 113 for accommodating the composite pole 3 and a plug-through hole 114 located in the receiving groove 113, the first insulating piece 12 comprises an upper insulating part 121, a lower insulating part 122 and a plug-in part 123, the upper insulating part 121 is arranged on the side of the first wall surface 111 away from the pole group 100 and is accommodated in the receiving groove 113, the lower insulating part 122 is arranged on the side of the first wall surface 111 facing the pole group 100, the plug-in part 123 is inserted into the plug-through hole 114 and is used to connect the upper insulating part 121 and the lower insulating part 122, and the through structure 124 penetrates the upper insulating part 121, the plug-in part 123 and the lower insulating part 122.

[0060] By arranging the first insulating piece 12 composed of the upper insulating part 121, the lower insulating part 122 and the plug-in part 123, arranging the upper insulating part 121 on the side of the first wall surface 111 of the shell body 11 away from the pole group 100, arranging the lower insulating part 122 on the side of the first wall surface 111 of the shell body 11 facing the pole group 100, inserting the plug-in part 123 into the plug-through hole 114, and arranging the through structure 124 penetrating the upper insulating part 121, the plug-in part 123 and the lower insulating part 122 to communicate with the receiving cavity, the two sides of the first wall surface 111 of the shell body 11 and the inside of the plug-through hole 114 are insulated and protected by the first insulating piece 12, the lug 101 and the first wall surface 111 of the shell body 11 are isolated, direct contact between the lug 101 and the first wall surface 111 of the shell body 11 when the lug 101 passes through the first wall surface 111 of the shell body 11 is avoided, short circuit is avoided, the insulation and protection performance of the lug 101 is improved, and the reliability of the structure is ensured.

[0061] In the embodiment, the shell body 11 is an aluminum shell, and the first insulating piece 12 is a plastic piece directly formed on the first wall surface 111 of the shell body 11 by an injection molding process. Compared with the traditional cover plate assembly, the separate lower insulating piece is cancelled, thereby reducing the number of parts and simplifying the assembly process. In addition, in the embodiment, the upper insulating part 121, the plug-in part 123 and the lower insulating part 122 are an integrated structure formed synchronously by the injection molding process, and in other embodiments, the upper insulating part 121, the plug-in part 123 and the lower insulating part 122 can be separately injection molded and then inserted into each other, so that the first insulating piece 12 is a split structure.

[0062] Optionally, asFigure 1 、 Figure 2 、 Figure 6 As shown, the battery housing also includes a connecting piece 5, and the upper insulating portion 121 is provided with a mounting boss 1211 protruding in a direction away from the electrode group 100. A mounting groove 1212 is provided on the side of the mounting boss 1211 away from the electrode group 100. The connecting piece 5 is arranged in the mounting groove 1212, and the pole ear 101 passing through the through structure 124 is connected to the connecting piece 5, and the connecting piece 5 is connected to the composite pole 3.

[0063] By providing the connecting piece 5 and first connecting the tab 101 to the connecting piece 5 and then connecting the connecting piece 5 to the composite pole 3, not only is the welding operation convenient, but the connecting piece 5 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 3. In addition, the mounting groove 1212 on the mounting boss 1211 limits the position of the connecting piece 5 accommodated therein, thereby ensuring the accuracy of the position of the connecting piece 5.

[0064] In this embodiment, the shape of the mounting groove 1212 matches the shape of the connecting piece 5 . The shape of the connecting piece 5 can be circular, elliptical or polygonal, etc. The specific shape is adjusted based on the convenience of welding with the tab 101 .

[0065] Alternatively, as Figure 1 、 Figure 2 As shown, the composite pole 3 includes a pole body 31 , a welding ring 32 and a second insulating member 33 . The second insulating member 33 is injection-molded between the pole body 31 and the welding ring 32 to insulate and connect the pole body 31 and the welding ring 32 into one. The pole body 31 is connected to the connecting piece 5 .

[0066] By injection molding the second insulating member 33 between the pole body 31 and the welding ring 32, the pole body 31 and the welding ring 32 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 33 is a plastic member formed by an injection molding process, an insulated connection between the pole body 31 and the welding ring 32 is achieved, which has high insulation protection performance and avoids the pole body 31 from being connected to the shell body 11 through the welding ring 32, thereby preventing the problem of short circuit.

[0067] In this embodiment, the pole body 31 is made of different materials according to the polarity of the pole ear 101. When the pole body 31 is connected to the positive pole ear, the pole body 31 is made of pure aluminum. When the pole body 31 is connected to the negative pole ear, the pole body 31 is made of copper-aluminum composite material. Compared with the pole body 31 made of pure copper, the production cost of the pole body 31 connected to the negative pole ear is effectively reduced.

[0068] Optionally, as shown in Figure 1 , Figure 2 , the side of the connecting piece 5 facing the pole body 31 is provided with a connecting boss 51 protruding towards the pole body 31, and the pole body 31 is connected with the connecting boss 51. By providing the connecting boss 51 on the side of the connecting piece 5 facing the pole body 31, the connecting piece 5 and the pole body 31 are conveniently welded. The size and shape of the connecting boss 51 can be freely set according to requirements, as long as the connecting boss 51 and the pole body 31 have sufficient welding area. In this embodiment, the connecting boss 51 is a circular truncated cone.

[0069] In addition, the connecting piece 5 is made of different materials according to the polarity of the tab 101. When the connecting piece 5 is connected with the positive tab, the connecting piece 5 is made of pure aluminum material. When the connecting piece 5 is connected with the negative tab, the connecting piece 5 is made of copper-aluminum composite material, which effectively reduces the manufacturing cost of the connecting piece 5 connected with the negative tab compared with the connecting piece 5 made of pure copper material.

[0070] The tab 101 connected with the connecting piece 5 can be connected to the side of the connecting piece 5 facing the pole group 100, or to the side of the connecting piece 5 away from the pole group 100. When the tab 101 is connected to the side of the connecting piece 5 facing the pole group 100, the length of the tab 101 can be effectively shortened, and the efficiency of current transmission is improved. When the tab 101 is connected to the side of the connecting piece 5 away from the pole group 100, the tab 101 is exposed to the outside, which facilitates the welding operation of the tab 101 and the connecting piece 5, reduces the difficulty of the welding operation, and improves the efficiency of the welding.

[0071] Optionally, as shown in Figure 1 , Figure 2 , Figure 5 , the battery shell further comprises a sealing member 6, which is arranged in the accommodating groove 113 and clamped between the pole body 31 and the shell body 11. By arranging the sealing member 6 clamped between the pole body 31 and the shell body 11 in the accommodating groove 113, the gap between the pole body 31 and the shell body 11 can be filled and sealed, and leakage of electrolyte can be avoided. In this embodiment, the sealing member 6 is made of rubber material.

[0072] Optionally, as shown in Figure 1 , Figure 2 , the battery shell further comprises an insulating protective film 7 and at least one protective side plate 8 connected to the insulating protective film 7, and the insulating protective film 7 is wrapped outside the surface of the pole group 100 without the tab 101. By wrapping the insulating protective film 7 connected with at least one protective side plate 8 outside the surface of the pole group 100 without the tab 101, the surface of the pole group 100 without the tab 101 is protected.

[0073] In the embodiment, the insulation protection film 7 is a polyester film, and the number of the protection side plates 8 can be one, two, three or four, and the specific number is adjusted according to the different protection requirements, in the embodiment, four protection side plates 8 are provided, before the pole group 100 is covered by the polyester film, the four protection side plates 8 are hot-melted on the polyester film, so that when the polyester film covers the pole group 100, the pole group 100 is protected from four sides, and the damage of the pole group 100 when entering the shell is avoided, and the product yield is reduced. The shape of the protection side plate 8 is matched with the surface of the pole group 100 without the pole lug 101.

[0074] In the embodiment, as shown in Figure 1 A battery is also provided, which comprises the pole group 100 and the above-mentioned battery shell, and the pole group 100 is arranged in the battery shell. The battery is assembled by applying the above-mentioned battery assembling method, so that the volume of the pole group 100 is further increased, thereby improving the energy density of the battery, increasing the power supply capacity of the battery, and improving the discharge performance and cycle life of the overall battery due to the improvement of the influence of the welding operation on the pole lug 101.

[0075] Obviously, the above-mentioned embodiments of the utility model are only examples for clearly explaining the utility model, and are not the limitation of the embodiments of the utility model. For ordinary skilled in the art, various obvious changes, re-adjustment and replacement can be made without departing from the protection scope of the utility model. Here, it is unnecessary and impossible to enumerate all the embodiments. Any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A battery housing, characterized by The battery shell comprises: A composite shell which is a hollow shell structure with one side open, and a through structure is arranged on the wall opposite to the open side for the tab of the pole group to extend out; A cover plate module which comprises a cover plate body and a connecting pole, the cover plate body is arranged at the open side of the composite shell and closes the composite shell to form a containing cavity containing the pole group, the connecting pole is arranged on the cover plate body, one end of the connecting pole is located outside the containing cavity, the other end of the connecting pole is located inside the containing cavity and connected with the tab on the other side of the pole group; A composite pole which is arranged on the side of the composite shell away from the cover plate module, and the tab extending out of the containing cavity realizes the conduction of current through the composite pole; At least one protective end plate, at least one protective end plate is arranged in the containing cavity, the protective end plate is arranged on the side of the pole group extending out of the tab, and a avoiding through hole is arranged for the tab to pass through.

2. The battery case of claim 1, wherein, The side of the protective end plate facing the pole group is provided with a shaping structure corresponding to the avoiding through hole, and the shaping structure is a horn type with an opening gradually narrowing away from the pole group.

3. The battery case of claim 1, wherein, The protective end plate further comprises a plurality of weight reduction structures, and a plurality of weight reduction structures pass through the protective end plate.

4. The battery case of claim 1, wherein, The battery shell comprises: A shell body which comprises a first wall and a plurality of second walls perpendicular to the first wall, a plurality of second walls are arranged around the periphery of the first wall to form a hollow shell structure with one side open, a containing groove for accommodating the composite pole and a plug-in through hole in the containing groove are arranged on the first wall; A first insulating piece which comprises an upper insulating part, a lower insulating part and a plug-in part, the upper insulating part is arranged on the side of the first wall away from the pole group and accommodated in the containing groove, the lower insulating part is arranged on the side of the first wall facing the pole group, the plug-in part is inserted into the plug-in through hole and used to connect the upper insulating part and the lower insulating part, and the through structure penetrates the upper insulating part, the plug-in part and the lower insulating part.

5. The battery case of claim 4, wherein, The battery shell further comprises a connecting sheet, the upper insulating part is provided with a mounting boss protruding away from the pole group, the side of the mounting boss away from the pole group is provided with a mounting groove, the connecting sheet is arranged in the mounting groove, the tab penetrating out of the through structure is connected with the connecting sheet, and the connecting sheet is connected with the composite pole.

6. The battery case of claim 5, wherein, The composite pole comprises a pole body, a welding ring and a second insulating piece, the second insulating piece is injection molded between the pole body and the welding ring to insulate and connect the pole body and the welding ring as a whole, and the pole body is connected with the connecting sheet.

7. The battery case of claim 6, wherein, The side of the connecting sheet facing the pole body is provided with a connecting boss protruding towards the pole body, and the pole body is connected with the connecting boss.

8. The battery case of claim 6, wherein, The battery shell further comprises a sealing piece which is arranged in the containing groove and clamped between the pole body and the shell body.

9. The battery case of claim 1, wherein, The battery case further comprises an insulating protective film wrapped on the surface of the electrode group without the tab, and at least one protective side plate connected to the insulating protective film.

10. A battery characterized by The battery comprises an electrode group and the battery case according to any one of claims 1-9, and the electrode group is arranged in the battery case.

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