Battery shell structure and battery

Abstract

The utility model relates to the technical field of batteries, and discloses a battery shell structure and a battery, the battery shell structure comprises a shell body, the inner wall of the shell body is enclosed to form a containing cavity, and the containing cavity is suitable for containing a pole group; a first through hole is formed in the shell body; the pole body is arranged in the first through hole, and the pole body and the pole group are arranged at an interval along the first direction; the pole body is recessed to form a step part, a second through hole is formed in the step part along the first direction, and the second through hole is communicated with the accommodating cavity; one end of the connecting piece is fixedly arranged on the pole group, and the other end of the connecting piece penetrates through the second through hole and is fixedly connected with one side, far away from the pole group, of the step part in the first direction. According to the battery shell structure provided by the utility model, the occupied space of the connecting piece in the accommodating cavity of the shell body is reduced, and the space utilization rate is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery shell structure and a battery. Background Art

[0002] As lithium-ion battery technology becomes increasingly mature, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields, and the requirements for the performance and safety of lithium-ion batteries are increasing.

[0003] In the existing lithium battery, the positive and negative poles, riveted blocks, upper plastic, lower plastic and sealing ring are all arranged on the cover plate. The connecting piece is first welded to the cover plate, and the pole ear of the pole group is then welded to the connecting piece welded to the cover plate, and then the cover plate is welded to the shell to form a seal. This structural form has low space utilization. Utility Model Content

[0004] In view of this, the utility model provides a battery housing structure and a battery to solve the problem of low space utilization of existing lithium batteries.

[0005] In a first aspect, the utility model provides a battery housing structure, comprising:

[0006] The shell body has an inner wall enclosing a receiving cavity, and the receiving cavity is suitable for receiving the pole group; a first through hole is opened on the shell body;

[0007] The pole body is arranged in the first through hole, and the pole body and the pole group are arranged in a first direction with a spacing; the pole body is recessed to form a step portion, and the step portion is provided along the first direction to form a second through hole, and the second through hole is connected to the accommodating cavity;

[0008] The connecting piece has one end fixedly arranged on the pole group, and the other end is suitable for passing through the second through hole and fixedly connected to the side of the step portion away from the pole group along the first direction.

[0009] Beneficial effects: The battery shell structure provided by the utility model mainly includes a shell body, a pole body and a connecting piece, and a step portion is provided on the pole body, and a second through hole is opened on the step portion along a first direction to form, so that one end of the connecting piece is welded and fixed to the pole group during the manufacturing process, and the other end of the connecting piece passes through the second through hole and is welded and fixed to the side of the step portion away from the pole group along the first direction, so that the connecting piece is at least partially built into the internal space of the pole body, reducing the space occupied by the connecting piece in the accommodating cavity of the shell body and improving space utilization.

[0010] In an optional embodiment, the connecting piece includes:

[0011] A first connecting portion, the first connecting portion is suitable for being welded and fixed to the pole group;

[0012] A first bending portion, disposed at one end of the first connecting portion;

[0013] A second connection portion is arranged at an end of the first bending portion away from the first connection portion, and the second connection portion is arranged at an angle to the first connection portion;

[0014] A second bending portion, disposed at an end of the second connecting portion away from the first bending portion;

[0015] The third connection portion is arranged at one end of the second bending portion away from the second connection portion, and the third connection portion is suitable for being welded and fixed to a side of the step portion away from the pole group along the first direction.

[0016] Beneficial effect: The first connecting part is welded to the pole ear of the pole group, so that an electrical connection is formed between the connecting piece and the pole group; the second connecting part and the first connecting part are arranged at an angle at the first bending part position, so that the connecting piece can smoothly pass through the second through hole of the pole body during the shell insertion process; after the shell insertion, the third connecting part and the second connecting part are arranged at an angle at the second bending part position, so that the third connecting part and the step part are welded and fixed along the first direction away from the side of the pole group, so that an electrical connection is formed between the connecting piece and the pole body, and at least part of the first bending part and the second connecting part, the second bending part and the third connecting part are completely built into the internal space of the pole body, thereby improving space utilization.

[0017] In an optional embodiment, the third connection portion has a first state in which it is located in the same plane as the second connection portion, and a second state in which it is arranged at an angle to the second connection portion at the second bending portion;

[0018] The third connection portion is suitable for passing through the second through hole in the first state, and is suitable for being welded and fixed to a side of the step portion away from the pole group along the first direction in the second state.

[0019] Beneficial effect: before the pole group is completely inserted into the shell, the third connection part is in the first state, and the connection piece is an "L"-shaped structure, so that the third connection part can smoothly pass through the second through hole of the pole body during the shell insertion process; after the pole group is completely inserted into the shell, the connection piece can be bent about 90° at the second bending portion. At this time, the third connection part is in the second state, and the connection piece is an "I"-shaped structure, so that the third connection part and the side of the step portion away from the pole group along the first direction are attached and completely built into the internal space of the pole body, thereby improving space utilization and facilitating welding of the third connection part and one side of the step portion, so that a stable and reliable electrical connection is formed between the connection piece and the pole body.

[0020] In an optional embodiment, a first accommodating groove is provided on the pole body, and the first accommodating groove is arranged on a side of the step portion close to the pole group along the first direction, and the first accommodating groove is suitable for accommodating at least part of the first bending portion and the second connecting portion.

[0021] Beneficial effect: By opening the first accommodating groove on the pole body, at least part of the first bending portion and the second connecting portion are built into the first accommodating groove, thereby saving space for the pole group and improving the space utilization rate of the shell body.

[0022] In an optional embodiment, a second accommodating groove is further provided on the pole body, and the second accommodating groove is arranged on a side of the step portion away from the pole group along the first direction, and the second accommodating groove is suitable for accommodating the third connecting portion.

[0023] Beneficial effect: By opening a second receiving groove on the pole body, the third connection part and at least part of the second bent part are built into the second receiving groove, so that the welding area between the third connection part and the step part is located in the second receiving groove, which is not only conducive to improving space utilization, but also makes the welding area between the third connection part and the step part away from the lower plastic, avoiding the risk of thermal melting of the lower plastic, and greatly improving the reliability of the battery.

[0024] In an optional embodiment, the connecting sheets are arranged in pairs, and each pair of connecting sheets are arranged opposite to each other; and the second connecting portions of each pair of connecting sheets are welded and fixed.

[0025] Beneficial effects: The flow between the connecting piece and the pole group and the pole body is increased, the heat generation is reduced, and the power is increased.

[0026] In an optional embodiment, the pole ear of the pole group is flattened to form a welding surface, the welding surface is arranged on one side of the pole group close to the connecting piece along the first direction, and the welding surface is suitable for welding with the first connecting portion.

[0027] Beneficial effect: The risk of the pole ear tearing is avoided by flattening the pole ear of the pole group to form a welding surface and welding the first connecting part to the welding surface.

[0028] In an optional embodiment, a third accommodating groove is further provided on the pole body, and the third accommodating groove is provided on a side of the step portion away from the pole group along the first direction;

[0029] The battery housing structure also includes a connecting block, which is built into the third accommodating groove and is suitable for welding and sealing with the pole body.

[0030] Beneficial effect: By opening the third accommodating groove on the pole body and placing the connecting block in the third accommodating groove, it is beneficial to reduce the space occupied by the connecting block and improve the space utilization rate; the connecting block is welded with the pole body to form a seal.

[0031] In an optional embodiment, the battery housing structure further includes an insulating sealing component, which is disposed between the pole body and the housing body;

[0032] A first convex rib and a second convex rib are provided on the pole body. The first convex rib is located on a side of the shell body away from the pole group along its own wall thickness direction, and the second convex rib is located on a side of the shell body close to the pole group along its own wall thickness direction. The first convex rib and the second convex rib are suitable for riveting and sealing the insulating sealing assembly.

[0033] Beneficial effect: By arranging the first convex rib and the second convex rib on the pole body, the insulating sealing assembly is riveted and sealed to ensure the sealing between the pole body and the shell body.

[0034] In a second aspect, the utility model further provides a battery, comprising: a battery body, and the battery casing structure as described above.

[0035] Beneficial effects: The battery of the second aspect includes the battery casing structure of the first aspect, and therefore, the battery of the second aspect includes all the beneficial effects of the battery casing structure of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 This is an overall assembly diagram of a battery housing structure according to an embodiment of the utility model;

[0038] Figure 2 for Figure 1 A local enlarged schematic diagram of the middle A;

[0039] Figure 3 A cross-sectional view of a housing body of a battery housing structure according to an embodiment of the utility model;

[0040] Figure 4 A cross-sectional view of a pole body of a battery housing structure according to an embodiment of the utility model;

[0041] Figure 5 for Figure 2 A cross-sectional view of the middle connecting piece;

[0042] Figure 6 It is an assembly diagram of a pole body, a housing body and an insulating sealing component of a battery housing structure according to an embodiment of the utility model;

[0043] Figure 7 for Figure 6 A partial enlarged schematic diagram of point B in the middle;

[0044] Figure 8 It is an assembly diagram of a connecting piece and a pole group of a battery housing structure according to an embodiment of the utility model;

[0045] Fig. 9 This is an assembly diagram of a battery housing structure of an embodiment of the utility model before the connecting piece is bent;

[0046] Fig.10 A three-dimensional diagram of a battery housing structure after the connecting piece is bent according to an embodiment of the utility model;

[0047] Fig.11 for Fig.10 A partial enlarged schematic diagram of point C in the middle;

[0048] Fig.12 It is an overall assembly diagram of another battery housing structure of an embodiment of the utility model;

[0049] Fig.13 for Fig.12 A partial enlarged schematic diagram of point D in the middle;

[0050] Fig.14 for Fig.13 A cross-sectional view of the middle connecting piece;

[0051] Fig.15 It is an assembly diagram of a connecting piece and an electrode group of another battery housing structure according to an embodiment of the utility model;

[0052] Fig.16 It is an assembly diagram of another battery housing structure of an embodiment of the utility model before the connecting piece is bent;

[0053] Fig.17 A three-dimensional diagram of another battery housing structure after the connecting piece is bent according to an embodiment of the utility model;

[0054] Fig.18 for Fig.17 A partial enlarged schematic diagram of point E in the middle.

[0055] Description of reference numerals:

[0056] 10. Shell body; 101. Accommodating cavity; 102. First through hole;

[0057] 20. Pole group; 21. Welding surface;

[0058] 30, pole body; 301, first receiving groove; 302, second receiving groove; 303, third receiving groove; 31, step portion; 311, second through hole; 32; first convex rib; 33, second convex rib;

[0059] 40. Connecting piece; 41. First connecting portion; 42. First bending portion; 43. Second connecting portion; 44. Second bending portion; 45. Third connecting portion;

[0060] 50. Connecting block;

[0061] 60. Insulating sealing assembly; 61. First insulating member; 62. Sealing ring; 63. Second insulating member. DETAILED DESCRIPTION

[0062] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0063] Combine the following Figures 1 to 18 , describing an embodiment of the utility model.

[0064] According to an embodiment of the present utility model, on the one hand, a battery housing structure is provided, comprising:

[0065] Housing body 10, see Figure 1 As shown, the inner wall of the chamber 101 is enclosed to form a housing chamber 101, and the housing chamber 101 is suitable for housing the electrode group 20; please combine Figure 3 As shown, the housing body 10 is provided with a first through hole 102;

[0066] The pole body 30 is fixedly disposed in the first through hole 102, and the pole body 30 and the pole group 20 are spaced apart along the first direction; see Figure 2 As shown, the pole body 30 is recessed to form a step portion 31, and a second through hole 311 is formed on the step portion 31 along the first direction, and the second through hole 311 is connected to the accommodating cavity 101;

[0067] The connecting piece 40 has one end welded and fixed to the electrode group 20 , and the other end is suitable for passing through the second through hole 311 and welded and fixed to the side of the step portion 31 away from the electrode group 20 along the first direction.

[0068] It should be noted that, in the manufacturing process, one end of the connecting piece 40 can be first welded and fixed to the pole ear of the pole group 20, so that the connecting piece 40 is electrically connected to the pole group 20; the pole body 30 is fixedly arranged in the first through hole 102, and an insulating sealing assembly 60 is arranged between the pole body 30 and the shell body 10 and riveted and sealed; then the connecting piece 40 and the pole group 20 are put into the shell together, and when entering the shell, the other end of the connecting piece 40 passes through the second through hole 311 and is then bent, so that the other end of the connecting piece 40 is in contact with the side of the step portion 31 away from the pole group 20 along the first direction, and finally the other end of the connecting piece 40 is welded and fixed to the side of the step portion 31 away from the pole group 20 along the first direction, so that the connecting piece 40 is electrically connected to the pole body 30; finally, the connecting block 50 is welded to the pole body 30 to form a seal.

[0069] The battery shell structure provided by the utility model mainly includes a shell body 10, a pole body 30 and a connecting piece 40, and a step portion 31 is provided on the pole body 30, and a second through hole 311 is formed on the step portion 31 along a first direction, so that one end of the connecting piece 40 is welded and fixed to the pole group 20 during the manufacturing process, and the other end of the connecting piece 40 passes through the second through hole 311 and is welded and fixed to the side of the step portion 31 away from the pole group 20 along the first direction, so that the connecting piece 40 is at least partially built into the internal space of the pole body 30, reducing the space occupied by the connecting piece 40 in the accommodating cavity 101 of the shell body 10 and improving the space utilization.

[0070] It is worth mentioning that in the lithium battery cells in the related technology, the positive and negative poles, riveted blocks, upper plastic, lower plastic and sealing rings and other components are all arranged on the cover plate. The connecting piece is first welded to the cover plate, and the pole ears of the pole group (need to be bent) are then welded to the connecting piece welded to the cover plate, and then the cover plate is welded to the shell to form a seal. On the one hand, this structural form has a low space utilization rate. On the other hand, there is a risk of thermal melting of the lower plastic when welding the connecting piece on the bottom plate of the pole of the cover plate, which can easily lead to failure of the performance of the lower plastic. In the battery shell structure provided by the utility model, before the electrode group 20 is inserted into the shell, one end of the connecting piece 40 is welded and fixed to the pole ear of the electrode group 20 to form an electrical connection. When inserted into the shell, the other end of the connecting piece 40 passes through the second through hole 311 and then is bent. Finally, the other end of the connecting piece 40 is welded and fixed to the side of the step portion 31 away from the electrode group 20 along the first direction, so that the welding area of ​​the connecting piece 40 and the pole ear of the electrode group 20 and the welding area of ​​the connecting piece 40 and the pole body 30 are away from the lower plastic, thereby avoiding the risk of thermal melting of the lower plastic and greatly improving the reliability of the battery.

[0071] In some embodiments, please combine Figure 5 and Fig. 9 As shown, the connecting piece 40 includes:

[0072] A first connecting portion 41, the first connecting portion 41 is suitable for being welded and fixed to the pole lug of the pole group 20;

[0073] A first bending portion 42, disposed at one end of the first connecting portion 41;

[0074] The second connection portion 43 is disposed at one end of the first bending portion 42 away from the first connection portion 41 , and the second connection portion 43 and the first connection portion 41 are disposed at a fixed angle;

[0075] The second bending portion 44 is disposed at one end of the second connecting portion 43 away from the first bending portion 42;

[0076] The third connection portion 45 is disposed at one end of the second bending portion 44 away from the second connection portion 43 , and the third connection portion 45 is suitable for being welded and fixed to a side of the step portion 31 away from the electrode assembly 20 along the first direction.

[0077] Furthermore, the included angle between the second connection portion 43 and the first connection portion 41 is 90°.

[0078] Furthermore, the first bending portion 42 and the second bending portion 44 are non-welding portions of the connecting piece 40 .

[0079] In this embodiment, the connecting piece 40 mainly includes a first connecting portion 41, a first bending portion 42, a second connecting portion 43, a second bending portion 44 and a third connecting portion 45; the first connecting portion 41 is welded to the pole ear of the pole group 20, so that an electrical connection is formed between the connecting piece 40 and the pole group 20; the second connecting portion 43 and the first connecting portion 41 are arranged at an angle at the position of the first bending portion 42, so that the connecting piece 40 can smoothly pass through the second through hole 311 of the pole body 30 during the shell insertion process; after entering the shell, the third connecting portion 45 and the second connecting portion 43 are arranged at an angle at the position of the second bending portion 44, so that the third connecting portion 45 is welded and fixed to the side of the step portion 31 away from the pole group 20 along the first direction, so that an electrical connection is formed between the connecting piece 40 and the pole body 30, thereby making at least part of the first bending portion 42 and the second connecting portion 43, the second bending portion 44 and the third connecting portion 45 completely built into the internal space of the pole body 30, thereby improving space utilization.

[0080] In some embodiments, please combine Figure 2 and Fig. 9 As shown, the third connection portion 45 has a first state where it is located in the same plane as the second connection portion 43, and a second state where it is arranged at an angle to the second connection portion 43 at the position of the second bending portion 44;

[0081] The third connection portion 45 is suitable for passing through the second through hole 311 in the first state, and is suitable for being welded and fixed to a side of the step portion 31 away from the pole group 20 along the first direction in the second state.

[0082] Before the pole group 20 is completely inserted into the shell, the third connecting portion 45 is in the first state, and the connecting piece 40 is an "L"-shaped structure, so that the third connecting portion 45 can smoothly pass through the second through hole 311 of the pole body 30 during the shell insertion process; after the pole group 20 is completely inserted into the shell, the connecting piece 40 can be bent about 90° at the second bending portion 44. At this time, the third connecting portion 45 is in the second state, and the connecting piece 40 is an "I"-shaped structure, so that the third connecting portion 45 and the side of the step portion 31 away from the pole group 20 along the first direction are attached and completely built into the internal space of the pole body 30, thereby improving space utilization and facilitating welding of the third connecting portion 45 and one side of the step portion 31, so that a stable and reliable electrical connection is formed between the connecting piece 40 and the pole body 30.

[0083] In some embodiments, please combine Figure 4 , Figure 7 and Fig. 9 As shown, the pole body 30 is provided with a first receiving groove 301 , which is arranged on one side of the step portion 31 close to the pole group 20 along the first direction, and is suitable for accommodating at least part of the first bending portion 42 and the second connecting portion 43 .

[0084] Furthermore, the first receiving groove 301 is communicated with the second through hole 311 .

[0085] In this embodiment, the first receiving groove 301 is opened on the pole body 30 so that at least part of the first bending portion 42 and the second connecting portion 43 are built into the first receiving groove 301 , thereby saving space for the pole group 20 and improving the space utilization of the shell body 10 .

[0086] In some embodiments, please combine Figure 4 , Figure 7 and Fig. 9 As shown, the pole body 30 is further provided with a second receiving groove 302 , which is arranged on the side of the step portion 31 away from the pole group 20 along the first direction, and is suitable for accommodating the third connecting portion 45 and at least part of the second bending portion 44 .

[0087] Furthermore, the second accommodating groove 302 is communicated with the second through hole 311 .

[0088] In this embodiment, a second receiving groove 302 is provided on the pole body 30 so that the third connection portion 45 and at least a portion of the second bending portion 44 are built into the second receiving groove 302, thereby making the welding area between the third connection portion 45 and the step portion 31 located in the second receiving groove 302, which is not only conducive to improving space utilization, but also makes the welding area between the third connection portion 45 and the step portion 31 away from the lower plastic, avoiding the risk of thermal melting of the lower plastic, and greatly improving the reliability of the battery.

[0089] In some embodiments, please combine Figure 12-Figure 18 As shown, the connecting sheets 40 are arranged in pairs, and each pair of connecting sheets 40 can be symmetrically arranged; the second connecting portions 43 of each pair of connecting sheets 40 can be fixed by ultrasonic welding.

[0090] It should be noted that Figure 5 The structure of a connecting piece 40 of an embodiment of the utility model is shown. Figure 5 The connecting piece 40 shown is able to meet the requirements for normal operation of the battery cell. Fig.14 Another structural form of the connecting piece 40 of the embodiment of the utility model is shown. Fig.14 The connecting piece 40 shown can better meet the requirements of normal operation of the battery cell. Fig.14 The assembly principle of the connecting piece 40 shown is similar to Figure 5 The assembly principle of the connecting piece 40 shown is the same and will not be described again.

[0091] In this embodiment, the connecting sheets 40 are arranged in pairs, the second connecting portions 43 of each pair of connecting sheets 40 are fixed by welding, the first connecting portions 41 of each pair of connecting sheets 40 are welded to the pole ears of the pole group 20 to form an electrical connection between the connecting sheets 40 and the pole group 20, and the third connecting portions 45 of each pair of connecting sheets 40 are welded to the side of the step portion 31 away from the pole group 20 along the first direction to form an electrical connection between the connecting sheets 40 and the pole body 30, thereby increasing the overcurrent between the connecting sheets 40 and the pole group 20 and the pole body 30, reducing heat generation, and improving power.

[0092] In some embodiments, see Figure 8 and Fig.15 As shown, the pole lugs of the pole group 20 are flattened to form a welding surface 21 , which is disposed on one side of the pole group 20 close to the connecting sheet 40 along the first direction, and is suitable for welding with the first connecting portion 41 .

[0093] In this embodiment, the electrode tabs of the electrode group 20 are flattened to form the welding surface 21 , and the first connecting portion 41 is welded to the welding surface 21 , thereby avoiding the risk of the electrode tabs being torn.

[0094] In some embodiments, see Figure 4As shown, the pole body 30 is further provided with a third receiving groove 303, and the third receiving groove 303 is arranged on a side of the step portion 31 away from the pole group 20 along the first direction;

[0095] See also Figure 2 and Fig.13 As shown, the battery housing structure further includes a connection block 50 , which is built into the third receiving groove 303 , and is suitable for being welded and sealed with the pole body 30 .

[0096] In this embodiment, a third receiving groove 303 is provided on the pole body 30 so that the connection block 50 can be built into the third receiving groove 303 , thereby reducing the space occupied by the connection block 50 and improving space utilization; the connection block 50 is welded to the pole body 30 to form a seal.

[0097] In some embodiments, the battery housing structure further includes an insulating sealing assembly 60, which is disposed between the pole body 30 and the housing body 10;

[0098] A first convex rib 32 and a second convex rib 33 are provided on the pole body 30. The first convex rib 32 is located on the side of the shell body 10 away from the pole group 20 along the direction of its own wall thickness, and the second convex rib 33 is located on the side of the shell body 10 close to the pole group 20 along the direction of its own wall thickness. The first convex rib 32 and the second convex rib 33 are suitable for riveting and sealing the insulating sealing assembly 60.

[0099] It should be noted that the insulating sealing assembly 60 may include a first insulating member 61, a sealing ring 62 and a second insulating member 63. The first insulating member 61 is arranged on the side of the shell body 10 away from the pole group 20 along its own wall thickness direction, and the second insulating member 63 is arranged on the side of the shell body 10 close to the pole group 20 along its own wall thickness direction. The high temperature resistance of the first insulating member 61 is better than that of the second insulating member 63; the sealing ring 62 is arranged between the first insulating member 61 and the second insulating member 63.

[0100] In this embodiment, by providing the first convex rib 32 and the second convex rib 33 on the pole body 30 , the insulating sealing assembly 60 is riveted and sealed to ensure the sealing between the pole body 30 and the housing body 10 .

[0101] According to an embodiment of the present invention, on the other hand, a battery is provided, including: a battery body, and the battery casing structure as described above.

[0102] The battery in this embodiment includes the above-mentioned battery casing structure, and therefore, the battery in this embodiment includes all the beneficial effects of the above-mentioned battery casing structure.

[0103] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A battery housing structure, characterized in that: include: The shell body has an inner wall enclosing a receiving cavity, and the receiving cavity is suitable for receiving the pole group; the shell body is provided with a first through hole; A pole body is arranged in the first through hole, and the pole body and the pole group are arranged in a first direction with a spacing; the pole body is recessed to form a step portion, and a second through hole is formed on the step portion along the first direction, and the second through hole is connected to the accommodating cavity; A connecting piece, one end of which is fixedly arranged on the pole group, and the other end of which is suitable for passing through the second through hole and fixedly connected to a side of the step portion away from the pole group along the first direction.

2. The battery housing structure according to claim 1, characterized in that: The connecting piece comprises: A first connection portion, the first connection portion being suitable for being welded and fixed to the electrode group; A first bending portion, disposed at one end of the first connecting portion; A second connecting portion, disposed at an end of the first bending portion away from the first connecting portion, the second connecting portion being disposed at an angle to the first connecting portion; A second bending portion, disposed at an end of the second connecting portion away from the first bending portion; The third connection portion is arranged at one end of the second bending portion away from the second connection portion, and the third connection portion is suitable for being welded and fixed to a side of the step portion away from the pole group along the first direction.

3. The battery housing structure according to claim 2, characterized in that: The third connection portion has a first state in which it is located in the same plane as the second connection portion, and a second state in which it is arranged at an angle to the second connection portion at the position of the second bending portion; The third connection portion is suitable for passing through the second through hole in the first state, and the third connection portion is suitable for being welded and fixed to a side of the step portion away from the pole group along the first direction in the second state.

4. The battery housing structure according to claim 2, characterized in that: The pole body is provided with a first accommodating groove, which is arranged on a side of the step portion close to the pole group along the first direction, and is suitable for accommodating at least part of the first bending portion and the second connecting portion.

5. The battery housing structure according to claim 2, characterized in that: The pole body is further provided with a second accommodating groove, which is arranged on a side of the step portion away from the pole group along the first direction, and the second accommodating groove is suitable for accommodating the third connecting portion.

6. The battery housing structure according to claim 2, characterized in that: The connecting sheets are arranged in pairs, and each pair of the connecting sheets is arranged opposite to each other; the second connecting portions of each pair of the connecting sheets are welded and fixed.

7. The battery housing structure according to claim 2, characterized in that: The pole lugs of the pole group are flattened to form a welding surface, and the welding surface is arranged on a side of the pole group close to the connecting sheet along the first direction, and the welding surface is suitable for welding with the first connecting portion.

8. The battery housing structure according to any one of claims 1 to 7, characterized in that: The pole body is also provided with a third receiving groove, and the third receiving groove is arranged on a side of the step portion away from the pole group along the first direction; The battery housing structure further comprises a connection block, which is built into the third receiving groove and is suitable for being welded and sealed with the pole body.

9. The battery housing structure according to any one of claims 1 to 7, characterized in that: The battery housing structure further includes an insulating sealing assembly, which is disposed between the pole body and the housing body; The pole body is provided with a first convex rib and a second convex rib, the first convex rib is located on a side of the shell body away from the pole group along the direction of its own wall thickness, and the second convex rib is located on a side of the shell body close to the pole group along the direction of its own wall thickness, and the first convex rib and the second convex rib are suitable for riveting and sealing the insulating sealing assembly.

10. A battery, characterized in that: include: A battery body, and a battery casing structure as claimed in any one of claims 1 to 9.

Images