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 and a composite pole, the composite shell is provided with a penetrating structure for a tab on one side to extend out, the cover plate module comprises a cover plate body and a connecting pole, the connecting pole penetrates through the cover plate body and is connected with the tab located on the other side in the containing cavity, the composite pole is arranged on the side, away from the cover plate module, of the composite shell, and the tab extending out of the containing cavity achieves current conduction through the composite pole. 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 space for connecting the bent tab with the composite pole 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 service life of the pole group is prolonged. And 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 workload 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] A composite shell, wherein the composite shell is a hollow shell structure with one side open, and a through structure for extending a tab on one side of the electrode group is provided on a wall of the composite shell opposite to the open side;

[0009] A cover plate module, comprising a cover plate body and a connecting pole, wherein the cover plate body is disposed at the opening of the composite shell and closes the composite shell to form an accommodating cavity for accommodating the pole group, and the connecting pole is passed through the cover plate body, with one end of the connecting pole located outside the accommodating cavity and the other end of the connecting pole located inside the accommodating cavity and connected to the pole lug on the other side of the pole group;

[0010] A composite pole is provided on a side of the composite housing away from the cover module, and the tab extending out of the accommodating cavity realizes current conduction through the composite pole.

[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 for accommodating the composite pole and a plug-in through hole located within the receiving groove;

[0013] A first insulating member, comprising an upper insulating portion, a lower insulating portion and a plug-in portion, wherein the upper insulating portion is arranged on the side of the first wall surface facing away from the pole group and is accommodated in the accommodating groove, and the lower insulating portion is arranged on the side of the first wall surface 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.

[0014] Optionally, the first insulating member further includes a shaping structure corresponding one-to-one to the plug-in through-holes, the shaping structure being arranged on a side of the lower insulating portion facing the pole group, and the shaping structure being a trumpet-shaped structure whose opening gradually shrinks in a direction away from the pole group.

[0015] Optionally, the first insulating member further includes a plurality of weight-reducing structures, and the plurality of weight-reducing structures are all provided on the lower insulating portion and pass through the lower insulating portion.

[0016] Optionally, 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.

[0017] 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.

[0018] Optionally, one side of the connecting piece towards 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.

[0019] 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.

[0020] 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 is wrapped outside the surface of the pole group without the tab.

[0021] In another aspect, a battery is provided, which comprises a pole group and the battery shell as claimed in any one of the above, and the pole group is arranged in the battery shell.

[0022] The battery shell has the following beneficial effects:

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

[0024] The battery has the following beneficial effects: 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, the influence of the welding operation on the tab is improved, and the discharge performance and cycle life of the overall battery are improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a structural exploded view of the battery provided by the utility model.

[0026] Figure 2 is the partial structure sectional view of the first wall surface of the composite shell in the battery provided by the utility model;

[0027] Figure 3 is the assembly drawing of the cover plate module in the battery shell provided by the utility model;

[0028] Figure 4 is the structure sectional view of the cover plate module in the battery shell provided by the utility model;

[0029] Figure 5 is the structure schematic view of the shell body in the battery shell provided by the utility model;

[0030] Figure 6 is the structure schematic view of the front of the first insulating piece in the battery shell provided by the utility model;

[0031] Figure 7 is the structure schematic view of the back of the first insulating piece in the battery shell provided by the utility model.

[0032] In the drawings:

[0033] 100, pole group; 101, pole lug;

[0034] 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 piece; 121, upper insulating part; 1211, mounting boss; 1212, mounting groove; 122, lower insulating part; 123, plug-in part; 124, through structure; 125, shaping structure; 126, weight-reducing structure;

[0035] 2, cover plate module; 21, cover plate body; 22, connecting pole; 23, lower plastic; 24, upper plastic; 25, sealing ring; 26, welding table;

[0036] 3, composite pole; 31, pole body; 32, welding ring; 33, second insulating piece;

[0037] 4, connecting sheet; 41, connecting boss;

[0038] 5, sealing piece;

[0039] 6, insulating protective film;

[0040] 7, protective side plate. DETAILED DESCRIPTION

[0041] The utility model will be described in further detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are merely intended 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.

[0042] In the description of the utility model, unless explicitly defined 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.

[0043] In the utility model, unless explicitly defined and limited, the first feature "on" or "below" the second feature can include that the first and second features are in direct contact, or 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.

[0044] 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 the description, and have no special meaning.

[0045] Due to the traditional blade battery structure, not only the space for the tab bending is reserved inside, but also the space for the pole of the cover plate assembly to extend into the cavity is reserved, on the one hand, a large amount of space is wasted, the space utilization rate is low, and the volume of the pole group is limited, resulting in low energy density, 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 changes 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.

[0046] Therefore, in order to reduce the waste of space, improve the utilization rate of space, increase the energy density of the pole group, and improve the influence of the welding operation on the microstructure of the pole ear, the embodiment provides a battery shell.

[0047] As shown in Figures 1 to 7 , the battery shell comprises a composite shell 1, a cover plate module 2, and a composite pole 3. 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 penetrating structure 124 for the pole ear 101 on one side of the pole group 100 to extend out. The cover plate module 2 comprises 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 pole ear 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 pole ear 101 extending out of the containing cavity realizes the conduction of current through the composite pole 3.

[0048] By providing the penetrating structure 124 on the composite shell 1 for the pole ear 101 on one side of the pole group 100 to extend out, the pole ear 101 on one side of the pole group 100 can realize the conduction of current through the composite pole 3 located outside the containing cavity by extending out of the containing cavity. Therefore, not only the space occupied by the connection between the pole ear 101 on this side and the composite pole 3 and the composite pole 3 extending into the containing cavity is saved, but also the internal space is reduced, the utilization rate of space is improved, the space for increasing the pole group 100 is provided, and the energy density is improved. In addition, by adopting the structure of the single-sided open composite shell 1 matched with the single cover plate module 2, the side of the pole ear 101 extending out of the penetrating structure 124 of the composite shell 1 has less welding operation amount, so that the influence of the high temperature generated by the welding operation on the microstructure of the pole ear 101 on this side is reduced, the resistance of the pole ear 101 on this side is reduced, and the electrical performance and mechanical performance of the pole ear 101 on this side are improved.

[0049] In the embodiment, as shown in Figure 3 , Figure 4As shown, the cover plate module 2 is a conventional welding cover plate, in addition to comprising a cover plate body 21 and a connecting post 22, it also comprises 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 plate body 21 away from the pole group 100, the welding platform 26 is arranged on the side of the upper plastic 24 away from the cover plate body 21, the lower plastic 23 is bonded to the side of the cover plate body 21 facing the pole group 100, and the connecting post 22 comprises a post body and a limiting portion, the post body is inserted through the lower plastic 23, the cover plate body 21 and the upper plastic 24 in sequence, is inserted into the welding platform 26, and is welded with the welding platform 26. The lower plastic 23 is clamped between the limiting portion and the cover plate body 21, and the upper plastic 24 is clamped between the cover plate body 21 and the welding platform 26, and the two sides of the cover plate body 21 are insulated and protected by the upper plastic 24 and the lower plastic 23, wherein the sealing ring 25 is sleeved on the post body, and is used to block the gap when the post body passes through the lower plastic 23, the cover plate body 21 and the upper plastic 24.

[0050] The type of the cover plate module 2 is not limited to the conventional welding cover plate, and in other embodiments, the cover plate module 2 can also be in the form of a conventional riveted cover plate or a conventional minimalist cover plate.

[0051] Optionally, as shown in Figure 1 、 Figure 2 、 Figure 5 、 Figure 6 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 post 3 and a plug-in through hole 114 located in the receiving groove 113, the first insulating piece 12 comprises an upper insulating portion 121, a lower insulating portion 122 and a plug-in portion 123, the upper insulating portion 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 portion 122 is arranged on the side of the first wall surface 111 facing the pole group 100, the plug-in portion 123 is inserted into the plug-in through hole 114 and is used to connect the upper insulating portion 121 and the lower insulating portion 122, and a through structure 124 penetrates the upper insulating portion 121, the plug-in portion 123 and the lower insulating portion 122.

[0052] By providing a first insulating member 12 consisting of an upper insulating portion 121, a lower insulating portion 122 and a plug-in portion 123, the upper insulating portion 121 is provided on the side of the first wall 111 of the shell body 11 away from the electrode group 100, the lower insulating portion 122 is provided on the side of the first wall 111 of the shell body 11 facing the electrode group 100, the plug-in portion 123 is inserted into the plug-in through hole 114, and the through structure 124 penetrates the upper insulating portion 121, the plug-in portion 123 and the lower insulating portion 122. It is connected to the accommodating cavity, so that the first insulating member 12 is used to implement insulation protection on both sides of the first wall 111 of the shell body 11 and the inside of the plug-in through hole 114, and the pole ear 101 and the first wall 111 of the shell body 11 are isolated to avoid direct contact between the pole ear 101 and the first wall 111 of the shell body 11 when passing through the first wall 111 of the shell body 11, resulting in a short circuit, thereby improving the insulation protection performance of the pole ear 101 and ensuring the reliability of the structure.

[0053] In this embodiment, the housing body 11 is an aluminum shell, and the first insulating member 12 is a plastic member directly molded onto the first wall 111 of the housing body 11 via an injection molding process. Compared to conventional 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 121, the plug portion 123, and the lower insulating portion 122 are a one-piece structural member formed simultaneously via an injection molding process. In other embodiments, the upper insulating portion 121, the plug portion 123, and the lower insulating portion 122 can be separately injection molded and then plugged into each other, making the first insulating member 12 a split structural member.

[0054] Alternatively, as Figure 1 、 Figure 2 、 Figure 5 、 Figure 7 As shown, the first insulating member 12 further includes a shaping structure 125 corresponding one-to-one to the plug-in through hole 114. The shaping structure 125 is provided on the side of the lower insulating portion 122 facing the pole group 100. The shaping structure 125 is a trumpet-shaped opening whose opening gradually shrinks in the direction away from the pole group 100.

[0055] By providing a shaping structure 125 on the side of the lower insulating portion 122 facing the electrode group 100, and making the shaping structure 125 into a trumpet shape with an opening gradually narrowing in the direction away from the electrode group 100, the multiple converged pole ears 101 extending from the through structure 124 on the electrode group 100 are better supported and fixed, and the convergence state of each pole ear 101 is improved, thereby avoiding the problem of short circuit inside the battery due to poor convergence effect of the pole ear 101.

[0056] In the embodiment, the first insulating member 12 is a plastic member made by an injection molding process. On the one hand, because of its soft material, it can avoid hard contact with the tab 101 and cause damage to the tab 101. On the other hand, because of its insulating property, it can improve the insulation protection effect.

[0057] Optionally, as shown in Figure 1 、 Figure 2 、 Figure 5 、 Figure 7 , the first insulating member 12 further includes a plurality of weight-reducing structures 126, which are arranged on the lower insulating part 122 and penetrate the lower insulating part 122. By arranging the weight-reducing structures 126, the weight of the first insulating member 12 is reduced, thereby meeting the design requirement of lightweight. In the embodiment, the weight-reducing structures 126 are through holes penetrating the lower insulating part 122.

[0058] Optionally, as shown in Figure 1 、 Figure 2 、 Figure 6 , the battery shell further includes a connecting sheet 4. The upper insulating part 121 is provided with a mounting boss 1211 protruding away from the polar group 100. A mounting groove 1212 is arranged on the side of the mounting boss 1211 away from the polar group 100. The connecting sheet 4 is arranged in the mounting groove 1212. The tab 101 penetrating the through structure 124 is connected with the connecting sheet 4. The connecting sheet 4 is connected with the composite pole 3.

[0059] By arranging the connecting sheet 4 and connecting the tab 101 with the connecting sheet 4 first and then connecting the connecting sheet 4 with the composite pole 3, the welding operation is facilitated. On the other hand, the position of the tab 101 is fixed in advance by the connecting sheet 4, which ensures the accuracy of the position of the tab 101 in subsequent operations and avoids the influence of the tab 101 on the conduction effect of the current between the tab 101 and the composite pole 3 due to the displacement of the tab 101. In addition, the connecting sheet 4 is limited in position by the mounting groove 1212 on the mounting boss 1211, thereby ensuring the accuracy of the position of the connecting sheet 4.

[0060] In the embodiment, the shape of the mounting groove 1212 is matched with the shape of the connecting sheet 4. The shape of the connecting sheet 4 can be circular, oval, or polygonal, and the specific shape is adjusted based on the convenience of welding with the tab 101.

[0061] Optionally, as shown in Figure 1 、 Figure 2 , 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 as a whole. The pole body 31 is connected with the connecting sheet 4.

[0062] By injection molding the second insulating piece 33 between the pole post body 31 and the welding ring 32, the pole post body 31 and the welding ring 32 are connected as a whole, 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 piece 33 is a plastic piece formed by injection molding process, the insulation connection of the pole post body 31 and the welding ring 32 is realized, and the insulation protection performance is high, avoiding the problem that the pole post body 31 is in communication with the shell body 11 through the welding ring 32, thereby causing short circuit.

[0063] In the embodiment, the pole post body 31 is made of different materials according to the polarity of the tab 101, when the pole post body 31 is connected with the positive tab, the pole post body 31 is made of pure aluminum material, when the pole post body 31 is connected with the negative tab, the pole post body 31 is made of copper-aluminum composite material, compared with the pole post body 31 made of pure copper material, thereby effectively reducing the manufacturing cost of the pole post body 31 connected with the negative tab.

[0064] Optionally, as shown in Figure 1 , Figure 2 , the side of the connecting piece 4 facing the pole post body 31 is provided with a connecting boss 41 protruding towards the pole post body 31, and the pole post body 31 is connected with the connecting boss 41. By providing the connecting boss 41 on the side of the connecting piece 4 facing the pole post body 31, the welding of the connecting piece 4 and the pole post body 31 is facilitated. The size and shape of the connecting boss 41 can be freely set according to requirements, as long as there is enough welding area between the connecting boss 41 and the pole post body 31. In the embodiment, the connecting boss 41 is a circular table.

[0065] In addition, the connecting piece 4 is made of different materials according to the polarity of the tab 101, when the connecting piece 4 is connected with the positive tab, the connecting piece 4 is made of pure aluminum material, when the connecting piece 4 is connected with the negative tab, the connecting piece 4 is made of copper-aluminum composite material, compared with the connecting piece 4 made of pure copper material, thereby effectively reducing the manufacturing cost of the connecting piece 4 connected with the negative tab.

[0066] The tab 101 connected with the connecting piece 4 can be connected to the side of the connecting piece 4 facing the pole group 100, or to the side of the connecting piece 4 away from the pole group 100, when the tab 101 is connected to the side of the connecting piece 4 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 4 away from the pole group 100, the tab 101 is exposed to the outside, thereby facilitating the welding operation of the tab 101 and the connecting piece 4, reducing the difficulty of the welding operation, and improving the efficiency of the welding.

[0067] Optionally, as shown in Figure 1 , Figure 2 ,Figure 5 As shown in the figure, the battery shell further comprises a sealing member 5, which is arranged in the accommodating groove 113 and clamped between the pole post body 31 and the shell body 11. By arranging the sealing member 5 clamped between the pole post body 31 and the shell body 11 in the accommodating groove 113, the gap between the pole post body 31 and the shell body 11 can be filled and sealed to avoid leakage of electrolyte. In this embodiment, the sealing member 5 is made of rubber material.

[0068] Optionally, as shown in Figure 1 , Figure 2 , the battery shell further comprises an insulating protective film 6 and at least one protective side plate 7 connected to the insulating protective film 6, and the insulating protective film 6 is wrapped on the surface of the pole group 100 without the tab 101. By wrapping the insulating protective film 6 connected with at least one protective side plate 7 on the surface of the pole group 100 without the tab 101, the surface of the pole group 100 without the tab 101 is protected.

[0069] In this embodiment, the insulating protective film 6 is a polyester film, and the number of protective side plates 7 can be one, two, three or four, and the specific number is adjusted according to the different protection requirements. In this embodiment, there are four protective side plates 7, and the four protective side plates 7 are hot-melted on the polyester film before the polyester film is wrapped on the pole group 100, so that when the polyester film is wrapped on the pole group 100, the four surfaces of the pole group 100 are protected, avoiding damage to the pole group 100 when it is put into the shell, and reducing the product yield. Among them, the shape of the protective side plate 7 is matched with the surface of the pole group 100 without the tab 101.

[0070] In this embodiment, as shown in Figure 1 , a battery is also provided, which comprises a 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 tab 101.

[0071] 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 not necessary and impossible to enumerate all the embodiments. Any modification, equivalent replacement and improvement made 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: The composite shell is a single-side open hollow shell structure, and a through structure is arranged on the wall opposite to the open side for the tab of one side of the pole group to extend out; 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 closes the composite shell to form a containing cavity containing the pole group, and 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; 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.

2. The battery case of claim 1, wherein, The composite shell comprises: The shell body comprises a first wall and a plurality of second walls perpendicular to the first wall, a plurality of the second walls are arranged around the periphery of the first wall to form a single-side open hollow shell structure, a containing groove for containing the composite pole and a plug-in through hole in the containing groove are arranged on the first wall; The first insulating piece 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 contained 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 arranged in the plug-in through hole and used for connecting 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.

3. The battery case of claim 2, wherein, The first insulating piece further comprises a shaping structure corresponding to the plug-in through hole, the shaping structure is arranged on the side of the lower insulating part facing the pole group, and the shaping structure is a horn type with an opening gradually narrowing away from the pole group.

4. The battery case of claim 2, wherein, The first insulating piece further comprises a plurality of weight-reducing structures, and the plurality of weight-reducing structures are arranged on the lower insulating part and penetrate the lower insulating part.

5. The battery case of claim 2, 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, a mounting groove is arranged on the side of the mounting boss away from the pole group, the connecting sheet is arranged in the mounting groove, the tab penetrating 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 into one body, 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 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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