Battery shell and battery

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery shell and a battery, the battery shell comprises a shell assembly and a protective plate group, the shell assembly comprises a shell body, a cover plate body and a combined pole, the cover plate body and the shell body form an accommodating cavity for accommodating the pole group, the cover plate body is provided with a mounting groove and a first penetrating structure, and the protective plate group is arranged in the mounting groove. The combined pole is accommodated in the mounting groove, and the protection plate group comprises at least one protection end plate provided with a second through structure. Through the arrangement of the second penetrating structure and the first penetrating structure, the tab can penetrate through the second penetrating structure and the first penetrating structure to achieve current conduction with the combined pole located on the outer side of the shell body, space does not need to be reserved for the combined pole and the tab to be bent in the containing cavity in the shell body, extra space occupation is reduced, and the space utilization rate is increased; and the protective end plates are arranged, so that the protective end plates play a role in insulating and protecting the tabs and also play a role in supporting and fixing the tabs, the tabs are prevented from skewing, and the reliability of the structure is improved.

Description

TECHNICAL FIELD

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

[0002] For the blade battery, the blade battery shell and the pole group are indispensable structures of the blade battery, wherein the pole group and the blade battery shell jointly constitute a complete battery. The pole group is the core component of the battery, responsible for storing and releasing electric energy, and is mainly composed of positive electrode material, negative electrode material, electrolyte and diaphragm. The pole group is the smallest unit of the power battery and is also an electric energy storage unit. It must have a high energy density to store as much electric energy as possible. The blade battery shell is a container that wraps the pole group. It 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-sided tab, the traditional blade battery shell usually includes a shell body and two cover plate assemblies respectively connected with the tabs. 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. The tabs are connected to the pole posts that extend into the chamber after being bent inside the chamber, thereby realizing the conduction of the pole group current.

[0004] The battery of this structure has the structure characteristic of two-sided tab, so that the chamber of the battery for accommodating the pole group needs to reserve double the space required for tab bending and pole post occupation, thereby greatly increasing the occupation of additional space, resulting in very low space utilization and greatly compressing the space available for the pole group, which limits the volume of the pole group, thereby reducing the energy density of the battery and the power supply capacity. 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 shell assembly comprises a shell body, a cover plate body and a combined pole, the shell body is a hollow shell structure with two open sides, the cover plate body is arranged at the opening side of the shell body to form a containing cavity containing the pole group, the cover plate body is provided with a mounting groove and a first through structure, the mounting groove is arranged on the side of the cover plate body away from the pole group, and the first through structure is arranged in the mounting groove and penetrates through the cover plate body, and the combined pole is contained in the mounting groove.

[0009] The protection plate group comprises at least one protection end plate, at least one protection end plate is arranged on one side of the pole group extending the tab, and is provided with a second through structure communicated with the first through structure, the tab passes through the second through structure and the first through structure in sequence and is connected with the combined pole.

[0010] Optionally, the shell assembly further comprises a first insulating piece, 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 cover plate body away from the pole group and contained in the mounting groove, the lower insulating part is arranged on the side of the cover plate body towards the pole group and clamped between the cover plate body and the protection end plate, the plug-in part is inserted into the first through structure and used for connecting the upper insulating part and the lower insulating part, and the first insulating piece is further provided with a third through structure penetrating through the upper insulating part, the plug-in part and the lower insulating part, and the third through structure is communicated with the second through structure.

[0011] Optionally, the upper insulating part is provided with a mounting boss protruding in the direction away from the pole group, and a containing groove is arranged on the mounting boss, the shell assembly further comprises a connecting sheet, the connecting sheet is arranged in the containing groove, the tab of the pole group penetrating through the third through structure is connected with the connecting sheet, and the connecting sheet is connected with the combined pole.

[0012] Optionally, the combined 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 connect the pole body and the welding ring into one body, the welding ring is welded in the mounting groove, and the pole body is connected with the connecting sheet.

[0013] Optionally, the side of the connecting sheet towards the pole body is provided with a connecting boss protruding close to the pole body, and the pole body is welded with the connecting boss.

[0014] Optionally, the side of the protection end plate away from the pole group is provided with a limiting groove, and the lower insulating part is embedded in the limiting groove.

[0015] Optionally, a side of the protective end plate facing the pole group is provided with a shaping structure corresponding to the second through structure, and the shaping structure is a horn type with an opening gradually narrowing away from the pole group.

[0016] Optionally, the shell assembly further comprises a sealing member arranged in the mounting groove and clamped between the combined pole and the cover plate body.

[0017] Optionally, the protective plate group further comprises at least one protective side plate arranged on a surface of the pole group not extending out of the lug.

[0018] In another aspect, a battery is also 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.

[0019] The battery shell has the following beneficial effects:

[0020] The battery shell has the following beneficial effects:

[0021] The battery provided by the utility model has the following beneficial effects: by applying the battery shell, the additional space is reduced, the space available for the pole group is enlarged, the volume of the pole group is increased, the battery has higher energy density and stronger power supply capacity. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structural exploded view of the battery provided by the utility model;

[0023] Figure 2 is a partial structural sectional view of the battery provided by the utility model;

[0024] Figure 3 is a structural schematic view of the cover plate body in the battery shell provided by the utility model;

[0025] Figure 4Is the structure schematic view of the front surface of the protective end plate in the battery shell provided by the utility model;

[0026] Figure 5 Is the structure schematic view of the back surface of the protective end plate in the battery shell provided by the utility model;

[0027] Figure 6 Is the structure schematic view of the first insulating piece in the battery shell provided by the utility model.

[0028] In the figure,

[0029] 100, pole group; 101, pole lug; 200, insulating film;

[0030] 1, shell assembly; 11, shell body; 12, cover plate body; 121, mounting groove; 122, first penetrating structure; 13, combined pole; 131, pole body; 132, welding ring; 133, second insulating piece; 14, first insulating piece; 141, upper insulating part; 1411, mounting boss; 1412, accommodating groove; 142, lower insulating part; 143, plug-in part; 144, third penetrating structure; 15, connecting sheet; 151, connecting boss; 16, sealing piece;

[0031] 2, protective plate group; 21, protective end plate; 211, second penetrating structure; 212, limiting groove; 213, shaping structure; 22, protective side plate. DETAILED DESCRIPTION

[0032] The utility model will be further explained in detail below in combination with the drawings and examples. It can be understood that the specific examples described here are only used to explain the utility model, and not limited to the utility model. In addition, it should be noted that in order to facilitate the description, only the part related to the utility model is shown in the drawings, not all the structures.

[0033] 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 mechanical connection, or electrical connection;It can be directly connected, or indirectly connected through intermediate medium, it can be the communication inside 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.

[0034] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can include direct contact between the first and second features, or indirect contact between the first and second features through another feature therebetween. Moreover, the first feature "on", "above" and "on top of" the second feature includes the first feature directly above and obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. The first feature "under", "below" and "underneath" the second feature includes the first feature directly below and obliquely below the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.

[0035] In the description of the present application, the terms "up", "down", "right", "left", and other orientation or position relationships are based on the orientation or position relationships shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used to distinguish in the description, and have no special meaning.

[0036] Since the pole group of the blade battery is in the form of two side tab, the cavity for accommodating the pole group of the blade battery needs to reserve double the space required for the bending of the tab and the pole, thereby greatly increasing the occupation of additional space, resulting in a very low space utilization rate, and greatly compressing the space available for the pole group, causing the volume of the pole group to be limited, thereby making the energy density of the blade battery lower and the power supply capacity poorer.

[0037] Therefore, in order to reduce the additional occupation of space, improve the utilization rate of space, expand the space available for the pole group, improve the energy density, and enhance the power supply capacity, the present application provides a battery shell.

[0038] As Figures 1 to 6As shown, the battery shell includes a shell assembly 1 and a protective plate group 2. The shell assembly 1 includes a shell body 11, a cover body 12 and a combined pole 13. The shell body 11 is a hollow shell structure with open sides. The cover body 12 is arranged at the open sides of the shell body 11 to form an accommodating cavity for accommodating the pole group 100. The cover body 12 is provided with a mounting groove 121 and a first through-structure 122. The mounting groove 121 is provided on the side of the cover body 12 away from the pole group 100. The first through-structure 122 is provided in the mounting groove 121 and penetrates the cover body 12. The combined pole 13 is accommodated in the mounting groove 121. The protective plate group 2 includes at least one protective end plate 21. The at least one protective end plate 21 is provided on the side of the pole group 100 extending from the pole ear 101 and is provided with a second through-structure 211 connected to the first through-structure 122. The pole ear 101 passes through the second through-structure 211 and the first through-structure 122 in sequence to be connected to the combined pole 13.

[0039] By providing a mounting groove 121 for accommodating the combined pole 13 and a first penetrating structure 122 penetrating the cover body 12 on the cover body 12, and by providing a protective end plate 21, and providing a second penetrating structure 211 connected to the first penetrating structure 122 on the protective end plate 21, when it is necessary to connect the pole tab 101 and the combined pole 13, the pole tab 101 can pass through the second penetrating structure 211 and the first penetrating structure 122 to achieve current conduction with the combined pole 13 located outside the shell body 11, and there is no need to reserve space in the accommodating cavity inside the shell body 11 for bending the combined pole 13 and the pole tab 101, thereby reducing additional space occupation and improving space utilization. In addition, the protective end plate 21 is provided on the side of the pole group 100 extending from the pole tab 101, so that the protective end plate 21 not only plays an insulating and protective role for the pole tab 101, but also plays a supporting and fixing role for the pole tab 101, thereby preventing the pole tab 101 from being skewed, thereby improving the reliability of the structure.

[0040] In the embodiment, the first through structures 122 and the second through structures 211 are of the same number and one-to-one correspondingly communicated, and the number thereof is determined according to the number of the pole groups 100 accommodated in the accommodating cavities. In the embodiment, two pole groups 100 are arranged in each accommodating cavity, and therefore two first through structures 122 are arranged in each mounting groove 121 of the cover plate body 12, and two second through structures 211 are arranged in each protective end plate 21. In the embodiment, the first through structures 122 and the second through structures 211 are both long through holes, so as to facilitate the insertion of the tab 101 of the corresponding pole group 100 after being folded. The number of the protective end plates 21 can be one or two, which is adjusted according to different protection requirements. In the embodiment, one protective end plate 21 is arranged on each side of the pole group 100 provided with the tab 101, so that the pole group 100 is protected from both sides by the protective end plates 21, and the tab 101 is prevented from being damaged when the pole group 100 is accommodated in the shell. After the protective end plate 21 is inserted with the tab 101 of the pole group 100, an insulating film 200 is wrapped outside the protective end plate 21, so as to insulate and protect the pole group 100. The insulating film 200 and the protective end plate 21 are connected by heat melting.

[0041] Optionally, as shown in Figure 2 、 Figure 6 The shell assembly 1 further includes a first insulating piece 14. The first insulating piece 14 includes an upper insulating portion 141, a lower insulating portion 142 and an insertion portion 143. The upper insulating portion 141 is arranged on the side of the cover plate body 12 away from the pole group 100 and accommodated in the mounting groove 121. The lower insulating portion 142 is arranged on the side of the cover plate body 12 facing the pole group 100 and clamped between the cover plate body 12 and the protective end plate 21. The insertion portion 143 is inserted into the first through structure 122 and used to connect the upper insulating portion 141 and the lower insulating portion 142. The first insulating piece 14 further includes a third through structure 144 penetrating the upper insulating portion 141, the insertion portion 143 and the lower insulating portion 142. The third through structure 144 is communicated with the second through structure 211.

[0042] By setting a first insulating member 14 consisting of an upper insulating portion 141, a lower insulating portion 142 and a plug-in portion 143, and making the upper insulating portion 141 arranged on the side of the cover body 12 away from the pole group 100, and the lower insulating portion 142 arranged on the side of the cover body 12 facing the pole group 100, and the plug-in portion 143 inserted into the first through-hole structure 122, the first insulating member 14 is used to insulate and protect both sides of the cover body 12 and the inside of the first through-hole structure 122, and isolate the pole ear 101 from the cover body 12, avoiding the pole ear 101 passing through the protective end plate 21 from direct contact with the cover body 12 when extending through the cover body 12 to the outside of the shell body 11, resulting in a short circuit, and the first insulating member 14 and the protective end plate 21 cooperate with each other to increase the insulation protection area, further improve the insulation protection performance of the pole ear 101, and ensure the reliability of the structure.

[0043] In this embodiment, the cover body 12 is made of a plain aluminum plate, and the protective end plate 21 and the first insulating member 14 are both plastic parts formed by an injection molding process. In this embodiment, the first insulating member 14 is directly molded onto the cover body 12 by the injection molding process, and the upper insulating portion 141, the plug portion 143, and the lower insulating portion 142 are simultaneously formed, making the first insulating member 14 an integral structural member formed by the injection molding process. In other embodiments, the upper insulating portion 141, the plug portion 143, and the lower insulating portion 142 can also be separately injection molded and then plugged into each other, making the first insulating member 14 a split structural member.

[0044] Alternatively, as Figure 2 、 Figure 6 As shown, the upper insulating portion 141 is provided with a mounting boss 1411 protruding in a direction away from the pole group 100, and a receiving groove 1412 is opened on the mounting boss 1411. The shell assembly 1 also includes a connecting piece 15, which is arranged in the receiving groove 1412. The pole ear 101 passing through the third through-structure 144 is connected to the connecting piece 15, and the connecting piece 15 is connected to the combined pole 13. By providing a connecting piece 15 for connecting the pole ear 101 and the combined pole column 13, the pole ear 101 is welded to the connecting piece 15 by bending after passing through the third through-structure 144. At this time, since the connecting piece 15 and the pole ear 101 are exposed to the outside world, on the one hand, it is convenient for the two to perform welding operations, and on the other hand, the position of the pole ear 101 is fixed in advance to avoid the pole ear 101 from moving, thereby affecting the welding quality. In addition, a receiving groove 1412 for accommodating the connecting piece 15 is provided on the mounting boss 1411 to limit the connecting piece 15, thereby ensuring the accuracy of the position of the connecting piece 15.

[0045] In the embodiment, the shape of the accommodating groove 1412 is matched with the shape of the connecting piece 15, and the shape of the connecting piece 15 can be circular, oval or polygonal, and the specific shape is adjusted according to the convenience of welding with the tab 101.

[0046] Optionally, as shown in Figure 1 、 Figure 2 , the combination pole 13 includes a pole body 131, a welding ring 132 and a second insulating piece 133, the second insulating piece 133 is injection molded between the pole body 131 and the welding ring 132, so as to connect the pole body 131 and the welding ring 132 into one body, the welding ring 132 is welded in the mounting groove 121, and the pole body 131 is connected with the connecting piece 15. By injection molding the second insulating piece 133 between the pole body 131 and the welding ring 132, the pole body 131 and the welding ring 132 are connected into one body, which on the one hand reduces the number of parts during assembly, shortens the assembly time and improves the assembly efficiency, and on the other hand plays an insulating protection role for the pole body 131, avoiding direct contact between the pole body 131 and the cover body 12, thereby causing short circuit.

[0047] In the embodiment, the pole body 131 is made of different materials according to the different polarities of the tabs 101, when the pole body 131 is connected with the positive tab 101, the pole body 131 is made of pure aluminum material, and when the pole body 131 is connected with the negative tab 101, the pole body 131 is made of copper-aluminum composite material, compared with the pole body 131 made of pure copper material, thereby effectively reducing the manufacturing cost of the pole body 131 connected with the negative tab 101.

[0048] Optionally, as shown in Figure 2 , the side of the connecting piece 15 facing the pole body 131 is provided with a connecting boss 151 protruding towards the pole body 131, and the pole body 131 is welded with the connecting boss 151. By providing the connecting boss 151 on the side of the connecting piece 15 facing the pole body 131, the welding of the connecting piece 15 and the pole body 131 is facilitated. The size and shape of the connecting boss 151 can be freely set according to requirements, as long as there is enough welding area between the connecting boss 151 and the pole body 131. In the embodiment, the connecting boss 151 is a circular truncated cone.

[0049] In addition, the connecting piece 15 is made of different materials according to the different polarities of the tabs 101, when the connecting piece 15 is connected with the positive tab 101, the connecting piece 15 is made of pure aluminum material, and when the connecting piece 15 is connected with the negative tab 101, the connecting piece 15 is made of copper-aluminum composite material, compared with the connecting piece 15 made of pure copper material, thereby effectively reducing the manufacturing cost of the connecting piece 15 connected with the negative tab 101.

[0050] Optionally, asFigure 2 、 Figure 4 As shown in FIG. 12, the side of the protection end plate 21 away from the pole group 100 is provided with a limiting groove 212, and the lower insulation part 142 is embedded in the limiting groove 212. By providing the limiting groove 212 on the side of the protection end plate 21 away from the pole group 100, the positioning effect is achieved when the lower insulation part 142 and the protection end plate 21 are assembled, and the accuracy of the position after assembly is ensured. The protection end plate 21 can be integrally formed with the first insulation part 14 by the injection molding process, or the protection end plate 21 and the lower insulation part 142 can be integrally formed by the injection molding process, and the upper insulation part 141 and the plug-in part 143 can be integrally formed by the injection molding process, so that the two are combined to insulate and protect the pole lug 101. In this embodiment, the protection end plate 21 and the first insulation part 14 are separate structures, the protection end plate 21 is separately formed by the injection molding process, the first insulation part 14 is separately formed by the injection molding process, and the connection of the two is realized by the limiting groove 212 and the plug-in of the lower insulation part 142.

[0051] Optionally, as shown in FIG. 13, Figure 2 、 Figure 5 The side of the protection end plate 21 facing the pole group 100 is provided with a shaping structure 213 corresponding to the second penetrating structure 211. The shaping structure 213 is a horn type with an opening gradually narrowing away from the pole group 100. By providing the shaping structure 213 on the side of the protection end plate 21 facing the pole group 100, and making the shaping structure 213 a horn type with an opening gradually narrowing away from the pole group 100, the multiple bundled pole lugs 101 on the pole group 100 are better supported and fixed, and the state of the bundled pole lugs 101 is improved, avoiding the problem of short circuit caused by poor bundling of the pole lugs 101 in the battery.

[0052] Optionally, as shown in FIG. 14, Figure 1 、 Figure 2 The housing assembly 1 further comprises a sealing member 16, which is arranged in the mounting groove 121 and clamped between the combined pole column 13 and the cover plate body 12. By arranging the sealing member 16 between the combined pole column 13 and the cover plate body 12, the gap between the combined pole column 13 and the cover plate body 12 is filled and sealed, avoiding leakage of electrolyte.

[0053] Optionally, as shown in FIG. 15, Figure 1 、 Figure 2 The protection plate group 2 further comprises at least one protection side plate 22 arranged on the surface of the pole group 100 not extending the pole lug 101. By arranging at least one protection side plate 22 on the surface of the pole group 100 not extending the pole lug 101, the surface of the pole group 100 not extending the pole lug 101 is protected.

[0054] The number of the protection side plates 22 can be one, two, three or four, and the specific number is adjusted according to different protection requirements. In the embodiment, four protection side plates 22 are provided. Before the insulating film 200 is wrapped around the pole group 100, the four protection side plates 22 are hot-melted on the insulating film 200. After the insulating film 200 is wrapped around the pole group 100 and hot-melted with the protection end plates 21, the six surfaces of the pole group 100 are protected by the cooperation of the two protection end plates 21 and the four protection side plates 22, so that the pole group 100 is prevented from being damaged when it is put into the shell, and the product yield is reduced. The shape of the protection side plate 22 can be freely set according to requirements.

[0055] In the embodiment, as shown in Figure 1 , Figure 2 A battery is also provided, which includes the pole group 100 and the above-mentioned battery shell. The pole group 100 is arranged in the battery shell. The battery reduces the occupation of the additional space by using the above-mentioned battery shell, expands the space available for the pole group 100, increases the volume of the pole group 100, has higher energy density and stronger power supply capacity.

[0056] 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 to 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 shell assembly, the shell assembly comprises a shell body, a cover plate body and a combined pole, the shell body is a hollow shell structure with two open sides, the cover plate body is arranged at the opening side of the shell body to form a containing cavity containing the pole group, the cover plate body is provided with a mounting groove and a first penetrating structure, the mounting groove is arranged on the side of the cover plate body away from the pole group, and the first penetrating structure is arranged in the mounting groove and penetrates the cover plate body, and the combined pole is accommodated in the mounting groove; a protection plate group, the protection plate group comprises at least one protection end plate, at least one protection end plate is arranged on the side of the pole group extending the tab, and is provided with a second penetrating structure communicated with the first penetrating structure, the tab passes through the second penetrating structure and the first penetrating structure in sequence to realize the conduction of current with the combined pole.

2. The battery case of claim 1, wherein, The shell assembly further comprises a first insulation piece, 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 cover plate body away from the pole group and is accommodated in the mounting groove, the lower insulation part is arranged on the side of the cover plate body towards the pole group and is clamped between the cover plate body and the protection end plate, the plug-in part is inserted into the first penetrating structure and is used for connecting the upper insulation part and the lower insulation part, and the first insulation piece is further provided with a third penetrating structure penetrating the upper insulation part, the plug-in part and the lower insulation part, and the third penetrating structure is communicated with the second penetrating structure.

3. The battery case of claim 2, wherein, The upper insulation part is provided with a mounting boss protruding in the direction away from the pole group, and a containing groove is arranged on the mounting boss, the shell assembly further comprises a connecting sheet, the connecting sheet is arranged in the containing groove, the tab penetrating the third penetrating structure is connected with the connecting sheet, and the connecting sheet is connected with the combined pole.

4. The battery case of claim 3, wherein, The combined pole comprises a pole body, a welding ring and a second insulation piece, the second insulation piece is injection molded between the pole body and the welding ring to connect the pole body and the welding ring into one body, the welding ring is welded in the mounting groove, and the pole body is connected with the connecting sheet.

5. The battery case of claim 4, wherein, The side of the connecting sheet towards the pole body is provided with a connecting boss protruding towards the pole body, and the pole body is welded with the connecting boss.

6. The battery case of claim 2, wherein, The side of the protection end plate away from the pole group is provided with a limiting groove, and the lower insulation part is embedded in the limiting groove.

7. The battery case of claim 1, wherein, The side of the protection end plate towards the pole group is provided with a shaping structure corresponding to the second penetrating structure, and the shaping structure is a horn type with an opening gradually narrowing away from the pole group.

8. The battery case of claim 1, wherein, The shell assembly further comprises a sealing piece, the sealing piece is arranged in the mounting groove and is clamped between the combined pole and the cover plate body.

9. The battery case of claim 1, wherein, The protection plate group further comprises at least one protection side plate, and at least one protection side plate is arranged on the surface of the pole group without extending the tab.

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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