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 provided with a first through structure, a composite cover plate provided with a second through structure, a composite pole and a protective end plate, the tab extends out of the accommodating cavity through the first penetrating structure and the second penetrating structure to realize current conduction with the composite pole, and a protective end plate is arranged in the accommodating cavity. The tab 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. The protective end plate is arranged to prevent the tabs from skewing when the tabs pass through, the reliability of the structure is improved, and the structural form that the composite shell with an opening in one side is matched with the single composite cover plate is adopted, so that the welding workload of the tabs on one side is reduced, and the electrical performance and the mechanical performance of the tabs 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, which is a single-side open hollow shell structure, and a first through structure is arranged on a wall surface opposite to the open side for the tab of one side of the pole group to extend out;

[0009] A composite cover plate, which 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 a second through structure is arranged on the composite cover plate for the tab of the other side of the pole group to extend out;

[0010] A composite pole, which is arranged on the side of the composite cover plate away from the pole group and the side of the composite shell away from the composite cover plate, 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, which is arranged in the containing cavity, is arranged on the side of the pole group extending out of the tab, and an avoiding through hole is arranged 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 composite shell comprises:

[0014] A shell body, which comprises a first wall surface and a plurality of second wall surfaces perpendicular to the first wall surface, and a plurality of second wall surfaces are arranged around the periphery of the first wall surface to form a single-side open hollow shell structure, and a first containing groove for containing the composite pole and a first plug-in through hole in the first containing groove are arranged on the first wall surface.

[0015] A first insulation piece, which comprises a first upper insulation part, a first lower insulation part, and a first plug-in part, the first upper insulation part is arranged on the side of the first wall surface away from the pole group and contained in the first containing groove, the first lower insulation part is arranged on the side of the first wall surface facing the pole group, the first plug-in part is inserted into the first plug-in through hole and used to connect the first upper insulation part and the first lower insulation part, and the first through structure penetrates the first upper insulation part, the first plug-in part, and the first lower insulation part.

[0016] Optionally, the composite cover plate comprises:

[0017] The cover plate body is provided with a second accommodating groove for accommodating the composite pole and a second insertion through hole in the second accommodating groove on the side of the cover plate body away from the pole group, and the cover plate body is connected to the opening of the shell body and closes the shell body to form the accommodating cavity;

[0018] The second insulation part includes a second upper insulation part, a second lower insulation part and a second insertion part, the second upper insulation part is arranged on the side of the cover plate body away from the pole group and accommodated in the second accommodating groove, the second lower insulation part is arranged on the side of the cover plate body facing the pole group, the second insertion part is inserted into the second insertion through hole and used for connecting the second upper insulation part and the second lower insulation part, and the second through structure penetrates the second upper insulation part, the second insertion part and the second lower insulation part.

[0019] Optionally, the battery shell further comprises a connecting piece;

[0020] The first upper insulation part is provided with a first mounting boss protruding in the direction away from the pole group, the first mounting boss is provided with a first mounting groove on the side away from the pole group, the connecting piece is arranged in the first mounting groove, the tab penetrating the first through structure is connected with the connecting piece, and the connecting piece is connected with the composite pole on the side of the composite shell away from the composite cover plate;

[0021] And / or, the second upper insulation part is provided with a second mounting boss protruding in the direction away from the pole group, the second mounting boss is provided with a second mounting groove on the side away from the pole group, the connecting piece is arranged in the second mounting groove, the tab penetrating the second through structure is connected with the connecting piece, and the connecting piece is connected with the composite pole on the side of the cover plate body away from the pole group.

[0022] Optionally, the composite pole comprises a pole body, a welding ring and a third insulation part, the third insulation part 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 piece.

[0023] Optionally, the side of the connecting piece facing the pole body is provided with a connecting boss protruding close to the pole body, and the pole body is connected with the connecting boss.

[0024] Optionally, the battery shell further comprises a sealing part, the sealing part arranged in the first accommodating groove is clamped between the pole body and the shell body, and the sealing part arranged in the second accommodating groove is clamped between the pole body and the cover plate body.

[0025] Optionally, the battery shell further comprises an insulating protective film and at least one protective side plate connected to the insulating protective film, the insulating protective film being wrapped on the surface of the pole group without the tab.

[0026] In another aspect, a battery is provided, the battery comprising a pole group and the battery shell according to any one of the preceding aspects, the pole group being arranged in the battery shell.

[0027] The battery shell has the advantages that:

[0028] The battery shell has the advantages that:

[0029] The battery shell has the advantages that: BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a structural exploded view of the battery provided by the utility model;

[0031] Figure 2 is a partial structural sectional view of the first wall surface of the composite shell in the battery provided by the utility model;

[0032] Figure 3 is a partial structural sectional view of the composite cover plate in the battery provided by the utility model;

[0033] Figure 4 is a structural schematic view of the shell body in the battery shell provided by the utility model;

[0034] Figure 5 is a structural schematic view of the first insulation piece in the battery shell provided by the utility model;

[0035] Figure 6 is a structural schematic view of the cover plate body in the battery shell provided by the utility model;

[0036] Figure 7 is a structural schematic view of the second insulation piece in the battery shell provided by the utility model;

[0037] Figure 8 is a structural schematic view of the front of the protective end plate in the battery shell provided by the utility model;

[0038] Figure 9 is a structural schematic view of the back of the protective end plate in the battery shell provided by the utility model.

[0039] In the drawings:

[0040] 100, pole group; 101, pole lug;

[0041] 1, composite shell; 11, shell body; 111, first wall surface; 112, second wall surface; 113, first accommodating groove; 114, first plug-in through hole; 12, first insulation piece; 121, first upper insulation part; 1211, first mounting boss; 1212, first mounting groove; 122, first lower insulation part; 123, first plug-in part; 124, first through structure;

[0042] 2, composite cover plate; 21, cover plate body; 211, second accommodating groove; 212, second plug-in through hole; 22, second insulation piece; 221, second upper insulation part; 2211, second mounting boss; 2212, second mounting groove; 222, second lower insulation part; 223, second plug-in part; 224, second through structure;

[0043] 3, composite pole; 31, pole body; 32, welding ring; 33, third insulation piece;

[0044] 4, protective end plate; 41, avoiding through hole; 42, shaping structure;

[0045] 5, connecting piece; 51, connecting boss;

[0046] 6, sealing piece;

[0047] 7, insulation protection film;

[0048] 8, protective side plate. DETAILED DESCRIPTION

[0049] 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.

[0050] 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, or 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.

[0051] 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 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.

[0052] 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.

[0053] 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 thereby affecting the discharge performance and cycle life of the blade battery.

[0054] Therefore, in order to reduce the waste of space, improve the utilization of space, increase the energy density of the electrode group, and improve the impact of welding operations on the microstructure of the tab, this embodiment provides a battery housing.

[0055] like Figures 1 to 9 As shown, the battery shell includes a composite shell 1, a composite cover plate 2, a composite pole 3 and at least one protective end plate 4. The composite shell 1 is a hollow shell structure with a single side open. A first penetrating structure 124 for the pole ear 101 on one side of the pole group 100 to extend is provided on the wall surface of the composite shell 1 opposite to the open side. The composite cover plate 2 is provided at the open portion of the composite shell 1 and closes the composite shell 1 to form an accommodating cavity for accommodating the pole group 100. A second penetrating structure 224 for the pole ear 101 on the other side of the pole group 100 to extend is provided on the composite cover plate 2. Composite poles 3 are provided on the side of the composite cover plate 2 facing away from the pole group 100 and on the side of the composite shell 1 facing away from the composite cover plate 2. The pole ear 101 extending out of the accommodating cavity realizes current conduction through the composite pole plate 3. At least one protective end plate 4 is provided in the accommodating cavity. The protective end plate 4 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 41 for the pole ear 101 to pass through.

[0056] By providing a first through-structure 124 on the composite housing 1 for extending the pole lug 101 on one side of the pole group 100, and providing a second through-structure 224 on the composite cover plate 2 for extending the pole lug 101 on the other side of the pole group 100, the pole lugs 101 on both sides of the pole group 100 can be connected to the composite pole post 3 located outside the accommodating cavity by extending out of the accommodating cavity. This not only eliminates the space occupied by the connection between the pole lug 101 and the composite pole post 3 and the extension of the composite pole post 3 into the accommodating cavity, thereby reducing the occupation of the internal space and improving the space utilization, but also provides space for increasing the pole group 100 and improving the energy density. In addition, a protective end plate 4 with an avoidance through-hole 41 is provided on the side of the pole group 100 where the pole lug 101 is provided, so as to provide support for the pole lug 101 when it is extended, thereby preventing the pole lug 101 from tilting and ensuring the reliability of the structure. In addition, by adopting a single-side open composite shell 1 in combination with a single composite cover plate 2, the side of the pole lug 101 extending from the pole group 100 through the first through-structure 124 of the composite shell 1 has less welding work, thereby reducing the impact of the high temperature generated by the welding operation on the microstructure of the pole lug 101 on this side, reducing the resistance of the pole lug 101 on this side, and improving the electrical and mechanical properties of the pole lug 101.

[0057] In the embodiment, the pole lug 101 of the pole group 100 includes the positive pole lug on one side and the negative pole lug on the other side according to the different polarity, in the actual assembly, the positive pole lug can be stretched out of the accommodating cavity through the first penetrating structure 124, or can be stretched out of the accommodating cavity through the second penetrating structure 224, and the negative pole lug is stretched out from the remaining first penetrating structure 124 or the second penetrating structure 224. The number of the protective end plate 4 can be one or two, which is adjusted according to the different protection requirements, in the embodiment, one protective end plate 4 is arranged on the side of the positive pole lug and the side of the negative pole lug for clamping and fixing, the number of the pole group 100 accommodated in the accommodating cavity is different for different specifications and models of the battery, therefore, the avoiding through hole 41 arranged on the protective end plate 4 is consistent with the number of the pole group 100 in the accommodating cavity, so as to protect the pole lug 101 of each pole group 100 and ensure the reliability of the structure, and the protective end plate 4 arranged on both sides of the pole group 100 can also play a double protection effect when the pole group 100 enters the shell, so as to avoid damage of the pole group 100 when entering the shell.

[0058] Optionally, as shown in Figure 2 、 Figure 3 、 Figure 9 , the side of the protective end plate 4 facing the pole group 100 is provided with a shaping structure 42 corresponding to the avoiding through hole 41, and the shaping structure 42 is a horn type with the opening gradually reducing away from the pole group 100.

[0059] The shaping structure 42 is arranged on the side of the protective end plate 4 facing the pole group 100, and the shaping structure 42 is a horn type with the opening gradually reducing away from the pole group 100, so that the multiple bundled pole lugs 101 on the pole group 100 are better supported and fixed, the bundling state of each pole lug 101 is improved, and the problem of short circuit caused by poor bundling of the pole lug 101 in the battery is avoided.

[0060] In the embodiment, the protective end plate 4 is a plastic part made by injection molding process, on the one hand, because the material is relatively soft, it can avoid hard contact with the pole lug 101 and cause damage to the pole lug 101, on the other hand, it also has insulation, so as to improve the insulation protection effect.

[0061] Optionally, as shown in Figure 1 、 Figure 2 、 Figure 4 、 Figure 5As shown, the composite shell 1 comprises a shell body 11 and a first insulation 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 first accommodating groove 113 for accommodating the composite pole 3 and a first plug-through hole 114 located in the first accommodating groove 113, the first insulation piece 12 comprises a first upper insulation part 121, a first lower insulation part 122 and a first plug part 123, the first upper insulation part 121 is arranged on the side of the first wall surface 111 away from the pole group 100 and is accommodated in the first accommodating groove 113, the first lower insulation part 122 is arranged on the side of the first wall surface 111 facing the pole group 100, the first plug part 123 is inserted into the first plug-through hole 114 and is used to connect the first upper insulation part 121 and the first lower insulation part 122, and the first through structure 124 penetrates through the first upper insulation part 121, the first plug part 123 and the first lower insulation part 122.

[0062] By arranging the first insulation piece 12 composed of the first upper insulation part 121, the first lower insulation part 122 and the first plug part 123, arranging the first upper insulation part 121 on the side of the first wall surface 111 of the shell body 11 away from the pole group 100, arranging the first lower insulation part 122 on the side of the first wall surface 111 of the shell body 11 facing the pole group 100, inserting the first plug part 123 into the first plug-through hole 114, and arranging the first through structure 124 penetrating through the first upper insulation part 121, the first plug part 123 and the first lower insulation part 122 to communicate with the accommodating cavity, the two sides of the first wall surface 111 of the shell body 11 and the inside of the first plug-through hole 114 are insulated and protected by the first insulation piece 12, the pole lug 101 and the first wall surface 111 of the shell body 11 are isolated, direct contact between the pole lug 101 and the first wall surface 111 of the shell body 11 when the pole lug 101 passes through the first wall surface 111 of the shell body 11 is avoided, short circuit is prevented, safety and protection are ensured, the first insulation piece 12 and the protection end plate 4 are cooperated to increase the area of insulation protection, the insulation protection performance of the pole lug 101 is further improved, and the reliability of the structure is ensured.

[0063] In the embodiment, the shell body 11 is an aluminum shell, and the first insulating member 12 is a plastic member 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 member is cancelled, thereby reducing the number of components and simplifying the assembly process. In addition, in the embodiment, the first upper insulating portion 121, the first insertion portion 123, and the first lower insulating portion 122 are formed as an integral structure by the injection molding process. In other embodiments, the first upper insulating portion 121, the first insertion portion 123, and the first lower insulating portion 122 can be separately injection molded and then inserted into each other, so that the first insulating member 12 is a split structure.

[0064] Optionally, as shown in Figure 1 、 Figure 3 、 Figure 6 、 Figure 7 , the composite cover plate 2 includes a cover plate body 21 and a second insulating member 22. The side of the cover plate body 21 away from the pole group 100 is provided with a second accommodating groove 211 for accommodating the composite pole 3 and a second insertion through hole 212 located in the second accommodating groove 211. The cover plate body 21 is connected to the opening of the shell body 11 and closes the shell body 11 to form an accommodating cavity. The second insulating member 22 includes a second upper insulating portion 221, a second lower insulating portion 222, and a second insertion portion 223. The second upper insulating portion 221 is arranged on the side of the cover plate body 21 away from the pole group 100 and accommodated in the second accommodating groove 211. The second lower insulating portion 222 is arranged on the side of the cover plate body 21 facing the pole group 100. The second insertion portion 223 is inserted into the second insertion through hole 212 and used to connect the second upper insulating portion 221 and the second lower insulating portion 222. A second through structure 224 penetrates the second upper insulating portion 221, the second insertion portion 223, and the second lower insulating portion 222.

[0065] By arranging the second insulating member 22 composed of the second upper insulating portion 221, the second lower insulating portion 222, and the second insertion portion 223, and arranging the second upper insulating portion 221 on the side of the cover plate body 21 away from the pole group 100, arranging the second lower insulating portion 222 on the side of the cover plate body 21 facing the pole group 100, and inserting the second insertion portion 223 into the second insertion through hole 212, the two sides of the cover plate body 21 and the inside of the second insertion through hole 212 are insulated and protected by the second insulating member 22, and the pole lug 101 and the cover plate body 21 are isolated. The pole lug 101 passing through the protection end plate 4 is prevented from directly contacting the cover plate body 21 when extending out of the accommodating cavity through the cover plate body 21, thereby preventing short circuit. In addition, the second insulating member 22 and the protection end plate 4 cooperate with each other to increase the area of insulation protection and further improve the insulation protection performance of the pole lug 101, thereby ensuring the reliability of the structure.

[0066] In the embodiment, the cover plate body 21 is an aluminum plate, and the second insulating member 22 is a plastic member directly formed on the cover plate body 21 by an injection molding process. Compared with a traditional cover plate assembly, the separate lower insulating member is cancelled, thereby reducing the number of components and simplifying the assembly process. In addition, in the embodiment, the second upper insulating part 221, the second plug-in part 223, and the second lower insulating part 222 are an integrated structure formed by the injection molding process. In other embodiments, the second upper insulating part 221, the second plug-in part 223, and the second lower insulating part 222 can be separately injection molded and then plugged with each other, so that the second insulating member 22 is a split structure.

[0067] Optionally, as shown in Figure 1 、 Figure 2 、 Figure 3 、 Figure 5 、 Figure 7 indicated, the battery shell further includes a connecting piece 5;

[0068] The first upper insulating part 121 is provided with a first mounting boss 1211 protruding away from the polar group 100. A first mounting groove 1212 is formed on the side of the first mounting boss 1211 away from the polar group 100. The connecting piece 5 is arranged in the first mounting groove 1212. The tab 101 passing through the first penetrating structure 124 is connected with the connecting piece 5. The connecting piece 5 is connected with the composite pole 3 located on the side of the composite shell 1 away from the composite cover plate 2.

[0069] And / or, the second upper insulating part 221 is provided with a second mounting boss 2211 protruding away from the polar group 100. A second mounting groove 2212 is formed on the side of the second mounting boss 2211 away from the polar group 100. The connecting piece 5 is arranged in the second mounting groove 2212. The tab 101 passing through the second penetrating structure 224 is connected with the connecting piece 5. The connecting piece 5 is connected with the composite pole 3 located on the side of the cover plate body 21 away from the polar group 100.

[0070] By connecting the tab 101 with the connecting piece 5 first and then connecting the connecting piece 5 with the composite pole 3, not only the welding operation is facilitated, but also the position of the tab 101 is fixed in advance by the connecting piece 5, ensuring the accuracy of the position of the tab 101 in subsequent operations, avoiding 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 piece 5 is limited in position by the first mounting groove 1212 on the first mounting boss 1211 and the second mounting groove 2212 on the second mounting boss 2211, thereby ensuring the accuracy of the position of the connecting piece 5.

[0071] In the embodiment, the shapes of the first mounting groove 1212 and the second mounting groove 2212 are matched with the shape of the connecting tab 5, and the shape of the connecting tab 5 can be circular, oval, polygonal or the like, and the specific shape is adjusted based on the convenience of welding with the tab 101.

[0072] Optionally, as shown in Figure 1 、 Figure 2 、 Figure 3 The composite pole 3 includes a pole body 31, a welding ring 32 and a third insulating piece 33, the third insulating piece 33 is injection molded between the pole body 31 and the welding ring 32, so as to insulate and connect the pole body 31 and the welding ring 32 into one body, and the pole body 31 is connected with the connecting tab 5.

[0073] By injection molding the third insulating piece 33 between the pole body 31 and the welding ring 32, the pole body 31 and the welding ring 32 are connected into one body, 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 third insulating piece 33 is a plastic part formed by injection molding process, the insulating connection of the pole body 31 and the welding ring 32 is realized, and the insulation protection performance is high, avoiding the problem that the pole body 31 communicates with the shell body 11 or the cover body 21 through the welding ring 32, thereby causing short circuit.

[0074] In the embodiment, the pole body 31 is made of different materials according to the different polarities of the tabs 101, when the pole body 31 is connected with the positive tab, the pole body 31 is made of pure aluminum material, and when the pole body 31 is connected with the negative tab, the pole body 31 is made of copper-aluminum composite material, compared with the pole body 31 made of pure copper material, thereby effectively reducing the manufacturing cost of the pole body 31 connected with the negative tab.

[0075] Optionally, as shown in Figure 1 、 Figure 2 、 Figure 3 、 Figure 5 、 Figure 7 The side of the connecting tab 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 tab 5 facing the pole body 31, the welding of the connecting tab 5 and the pole body 31 is facilitated. The size and shape of the connecting boss 51 can be freely set according to the requirements, as long as there is enough welding area between the connecting boss 51 and the pole body 31. In the embodiment, the connecting boss 51 is a circular boss.

[0076] 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. When the connecting piece 5 is connected with the negative tab, the connecting piece 5 is made of copper-aluminum composite material. Compared with the connecting piece 5 made of pure copper, the production cost of the connecting piece 5 connected with the negative tab is effectively reduced.

[0077] 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 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, so that the welding operation of the tab 101 and the connecting piece 5 is facilitated, the difficulty of the welding operation is reduced, and the efficiency of the welding is improved.

[0078] Optionally, as shown in Figure 1 , Figure 2 , Figure 3 The battery shell further includes a sealing piece 6. The sealing piece 6 arranged in the first accommodating groove 113 is clamped between the pole column body 31 and the shell body 11. The sealing piece 6 arranged in the second accommodating groove 211 is clamped between the pole column body 31 and the cover plate body 21. By arranging the sealing piece 6 clamped between the pole column body 31 and the shell body 11 in the first accommodating groove 113 and arranging the sealing piece 6 clamped between the pole column body 31 and the cover plate body 21 in the second accommodating groove 211, the gap between the pole column body 31 and the shell body 11 and the gap between the pole column body 31 and the cover plate body 21 can be filled and sealed, so that the leakage of electrolyte is avoided. In this embodiment, the sealing piece 6 is a sealing ring made of rubber.

[0079] Optionally, as shown in Figure 1 , Figure 2 , Figure 3 The battery shell further includes an insulating protective film 7 and at least one protective side plate 8 connected to the insulating protective film 7. 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 the 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.

[0080] In the embodiment, the insulation protective film 7 is a polyester film, and the number of the protective side plates 8 can be one, two, three or four, and the specific number is adjusted according to the different requirements of the protection, in the embodiment, the protective side plates 8 are provided with four, before the polyester film is coated on the pole group 100, the four protective side plates 8 are hot-melted on the polyester film, so that when the polyester film is coated on the pole group 100, and the protective end plates 4 are hot-melted, the six surfaces of the pole group 100 are protected by the two protective end plates 4 and the four protective side plates 8, so that the damage of the pole group 100 when entering the shell is avoided, and the product yield is reduced. The shape of the protective side plate 8 is matched with the surface of the pole group 100 without the pole lug 101.

[0081] 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 using 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.

[0082] 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, all the embodiments are not required or can not be exhausted. 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 first 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; A composite cover plate which 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 a second through structure is arranged on the composite cover plate for the tab of the other side of the pole group to extend out; A composite pole which is arranged on the side of the composite cover plate away from the pole group and the side of the composite shell away from the composite cover plate, and the tab extending out of the containing cavity realizes the conduction of current through the composite pole; At least one protective end plate which 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 a avoiding through hole 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 battery shell comprises: A shell body which comprises a first wall and a plurality of second walls perpendicular to the first wall, and a plurality of second walls are arranged around the periphery of the first wall to form a hollow shell structure with one side open, and a first containing groove for containing the composite pole and a first plug-in through hole in the first containing groove are arranged on the first wall; A first insulation piece which comprises a first upper insulation part, a first lower insulation part and a first plug-in part, the first upper insulation part is arranged on the side of the first wall away from the pole group and contained in the first containing groove, the first lower insulation part is arranged on the side of the first wall facing the pole group, the first plug-in part is inserted into the first plug-in through hole and used for connecting the first upper insulation part and the first lower insulation part, and the first through structure penetrates the first upper insulation part, the first plug-in part and the first lower insulation part.

4. The battery case of claim 3, wherein, The composite cover plate comprises: A cover plate body which is provided with a second containing groove for containing the composite pole and a second plug-in through hole in the second containing groove on the side away from the pole group, and the cover plate body is connected to the open side of the shell body and closes the shell body to form the containing cavity; A second insulation piece which comprises a second upper insulation part, a second lower insulation part and a second plug-in part, the second upper insulation part is arranged on the side of the cover plate body away from the pole group and contained in the second containing groove, the second lower insulation part is arranged on the side of the cover plate body facing the pole group, the second plug-in part is inserted into the second plug-in through hole and used for connecting the second upper insulation part and the second lower insulation part, and the second through structure penetrates the second upper insulation part, the second plug-in part and the second lower insulation part.

5. The battery case of claim 4, wherein, The battery shell further comprises a connecting sheet; The first upper insulation part is provided with a first mounting boss protruding away from the direction of the pole group, a first mounting groove is formed on the side of the first mounting boss away from the pole group, the connecting piece is arranged in the first mounting groove, the pole lug of the first penetrating structure is connected with the connecting piece, and the connecting piece is connected with the composite pole column on the side of the composite shell away from the composite cover plate. And / or, the second upper insulation part is provided with a second mounting boss protruding away from the direction of the pole group, a second mounting groove is formed on the side of the second mounting boss away from the pole group, the connecting piece is arranged in the second mounting groove, the pole lug of the second penetrating structure is connected with the connecting piece, and the connecting piece is connected with the composite pole column on the side of the cover plate body away from the pole group.

6. The battery case of claim 5, wherein, The composite pole column comprises a pole column body, a welding ring and a third insulation piece, the third insulation piece is injection molded between the pole column body and the welding ring, so as to insulate and connect the pole column body and the welding ring into one body, and the pole column body is connected with the connecting piece.

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

8. The battery case of claim 7, wherein, The battery shell further comprises a sealing piece, the sealing piece arranged in the first accommodating groove is clamped between the pole column body and the shell body, and the sealing piece arranged in the second accommodating groove is clamped between the pole column body and the cover plate body.

9. The battery case of claim 1, wherein, The battery shell further comprises an insulation protection film and at least one protection side plate connected to the insulation protection film, and the insulation protection film covers the surface of the pole group without the pole lug.

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

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