Battery

Abstract

The utility model relates to the technical field of batteries, and provides a battery which comprises a battery shell which comprises a first shell section, and a pole through hole is formed in the first shell section; the battery cell is arranged in the battery shell, and the battery cell comprises a battery cell main body and a battery cell leading-out end; the battery core leading-out end is electrically connected with the first pole assembly, the riveting section and the limiting section are located on the outer side, away from the battery core, of the first shell section and the inner side, close to the battery core, of the first shell section respectively, at least part of the connecting section is arranged in the pole through hole in a penetrating mode, and a recess is formed in the side, facing the riveting section, of the connecting section; the length of the first edge is greater than that of the second edge, the shortest distance between the limiting section and the first edge is a, the shortest distance between the limiting section and the second edge is b, and a / b is 0.06-3, so that the risk that the first shell section is seriously deformed after an internal structure of the battery impacts the limiting section can be reduced, and the situation that the stability of the first shell section is relatively weak due to unbalance of the structure is avoided; and the safe use performance of the battery is reliably improved.

Description

Technical Field

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

[0002] In the related art, the pole assembly of the battery can be riveted to the battery shell. By riveting the pole assembly to the battery shell, the overall assembly efficiency of the pole assembly can be improved, and the overall structural stability of the battery can be ensured. However, due to the location restrictions of the pole assembly, the structural stability of the battery shell may be affected, thereby affecting the safety performance of the battery. Utility Model Content

[0003] The utility model provides a battery to improve the use performance of the battery.

[0004] The utility model provides a battery, comprising:

[0005] A battery housing, the battery housing comprising a first housing section, the first housing section being provided with a pole through hole;

[0006] The battery cell is arranged in the battery housing, and the battery cell comprises a battery cell body and a battery cell lead-out terminal, and the battery cell lead-out terminal is led out from the battery cell body;

[0007] A first pole assembly, the first pole assembly is arranged on the first housing section, the battery cell lead end is electrically connected to the first pole assembly, the first pole assembly comprises a riveted section, a connecting section and a limiting section, the connecting section connects the riveted section and the limiting section, the riveted section and the limiting section are respectively located on the outer side of the first housing section away from the battery cell and the inner side close to the battery cell, at least part of the connecting section is penetrated in the pole through hole, a recess is formed on one side of the connecting section facing the riveted section, and the riveted section, the connecting section and the limiting section are an integrated structure;

[0008] Among them, the first shell segment has two opposite first edges and two opposite second edges, the length of the first edge is greater than the length of the second edge, the shortest distance between the limit segment and the first edge is a, the shortest distance between the limit segment and the second edge is b, and a / b is 0.06-3.

[0009] The battery of the utility model embodiment includes a battery housing, a battery cell and a first pole assembly, the battery cell is arranged in the battery housing, the first pole assembly is arranged on the battery housing, and the battery cell is electrically connected to the first pole assembly. A pole through hole is arranged on the first housing section of the battery housing, the first pole assembly includes an integrally formed riveted section, a connecting section and a limiting section, a depression is formed on the side of the connecting section facing the riveted section, the riveted section and the limiting section are respectively located on the outer side of the first housing section away from the battery cell and the inner side close to the battery cell, the connecting section is penetrated in the pole through hole, so that when the first pole assembly is installed, the riveted section and the limiting section can be used to reliably fix the first pole assembly to the first housing section, thereby reducing the risk of the first pole assembly being separated from the first housing section. A depression is formed on the side of the connecting section facing the riveted section, which will make the bottom end structural strength of the first pole assembly relatively weak, that is, the structural strength of the limiting section is relatively weak, and the risk of deformation of the limiting section under stress is relatively large, and the first shell section has two opposite first edges and two opposite second edges, the length of the first edge is greater than the length of the second edge, the position of the limiting section relative to the first edge and the second edge of the first shell section is unbalanced, the force balance of the limiting section is relatively poor, and the limiting section is more easily deformed under stress, and the shortest distance between the limiting section and the first edge is a, the shortest distance between the limiting section and the second edge is b, and a / b is 0.06-3, thereby reducing the risk of serious deformation of the first shell section caused by deformation of the limiting section after the internal structure of the battery collides with the limiting section, thereby avoiding the first shell section structural imbalance and weak stability, thereby ensuring the structural stability of the battery shell, and reliably improving the safe use performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to better understand the present disclosure, reference may be made to the embodiments shown in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, related elements or components may have different arrangements as known in the art. In addition, in the drawings, the same reference numerals represent the same or similar components in each drawing. Among them:

[0011] Figure 1 is a schematic structural diagram of a battery according to an exemplary embodiment;

[0012] Figure 2 is a schematic diagram of the internal structure of a battery according to an exemplary embodiment;

[0013] Figure 3 is a schematic diagram of a cross-sectional structure of a battery according to an exemplary embodiment;

[0014] Figure 4 is a schematic diagram of a partial cross-sectional structure of a battery according to a first exemplary embodiment;

[0015] Figure 5 is a schematic diagram of a partial cross-sectional structure of a battery according to a second exemplary embodiment;

[0016] Figure 6 is a schematic diagram of a partial cross-sectional structure of a battery according to a third exemplary embodiment;

[0017] Figure 7 is a schematic diagram of a partial cross-sectional structure of a battery according to a fourth exemplary embodiment;

[0018] Figure 8 is a schematic diagram of a partial cross-sectional structure of a battery according to a fifth exemplary embodiment;

[0019] Fig. 9 is a schematic structural diagram of a battery according to another exemplary embodiment;

[0020] Fig.10 is a schematic diagram of a partial cross-sectional structure of a battery according to another exemplary embodiment.

[0021] The following are the descriptions of the reference numerals:

[0022] 10. Battery shell; 11. First shell section; 111. First edge; 112. Second edge; 113. Inner surface; 12. Pole through hole; 13. Side wall section; 14. Second shell section; 20. Battery cell; 21. Battery cell body; 22. Battery cell lead-out terminal; 221. Welding mark; 222. Pole ear; 223. Electrical connecting piece; 30. First pole assembly; 31. Riveted section; 32. Connecting section; 33. Limiting section; 34. Recess; 35. Accommodating groove; 36. Through hole; 40. Second pole assembly; 50. Shielding member; 60. Insulating member. DETAILED DESCRIPTION

[0023] The following will be combined with the accompanying drawings in the exemplary embodiments of the present disclosure to clearly and completely describe the technical solutions in the exemplary embodiments of the present disclosure. The exemplary embodiments described herein are only for illustrative purposes and are not intended to limit the scope of protection of the present disclosure. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of the present disclosure.

[0024] In the description of the present disclosure, unless otherwise clearly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; the term "plurality" refers to two or more; the term "and / or" includes any and all combinations of one or more associated listed items. In particular, reference to "the / the" object or "an" object is also intended to indicate one of a possible plurality of such objects.

[0025] Unless otherwise specified or explained, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.

[0026] Further, in the description of the present disclosure, it should be understood that the directional words such as "upper", "lower", "inner", "outer" and the like described in the exemplary embodiments of the present disclosure are described at the angles shown in the accompanying drawings and should not be understood as limitations on the exemplary embodiments of the present disclosure. It should also be understood that, in the context, when it is mentioned that an element or feature is connected to another element (one or more) "upper", "lower", or "inner", "outer", it can not only be directly connected to the other (one or more) elements "upper", "lower", "inner", "outer", but also can be indirectly connected to the other (one or more) elements "upper", "lower", "inner", "outer" through an intermediate element.

[0027] An embodiment of the present utility model provides a battery, please refer to Figures 1 to 10 The battery comprises: a battery housing 10, the battery housing 10 comprises a first housing section 11, and a pole through hole 12 is arranged on the first housing section 11; a battery cell 20, the battery cell 20 is arranged in the battery housing 10, the battery cell 20 comprises a battery cell body 21 and a battery cell lead-out terminal 22, and the battery cell lead-out terminal 22 is led out from the battery cell body 21; a first pole assembly 30, the first pole assembly 30 is arranged on the first housing section 11, the battery cell lead-out terminal 22 is electrically connected to the first pole assembly 30, the first pole assembly 30 comprises a riveted section 31, a connecting section 32 and a limiting section 33, the connecting section 32 connects the riveted section 31 and the limiting section 33, and the riveted section 31 and the limiting section 33 are respectively Located on the outer side of the first shell segment 11 away from the battery cell 20 and the inner side close to the battery cell 20, at least a portion of the connecting segment 32 is inserted into the pole through hole 12, and a recess 34 is formed on the side of the connecting segment 32 facing the riveted segment 31. The riveted segment 31, the connecting segment 32 and the limiting segment 33 are an integrally formed structure; wherein, the first shell segment 11 has two opposite first edges 111 and two opposite second edges 112, the length of the first edge 111 is greater than the length of the second edge 112, the shortest distance between the limiting segment 33 and the first edge 111 is a, the shortest distance between the limiting segment 33 and the second edge 112 is b, and a / b is 0.06-3.

[0028] A battery in one embodiment of the utility model includes a battery housing 10, a battery cell 20 and a first pole assembly 30, wherein the battery cell 20 is disposed in the battery housing 10, and the first pole assembly 30 is disposed on the battery housing 10, and the battery cell 20 is electrically connected to the first pole assembly 30. A pole through hole 12 is disposed on the first housing segment 11 of the battery housing 10, and the first pole assembly 30 includes an integrally formed riveted segment 31, a connecting segment 32 and a limiting segment 33, wherein a recess 34 is formed on the side of the connecting segment 32 facing the riveted segment 31, and the riveted segment 31 and the limiting segment 33 are respectively located on the outer side of the first housing segment 11 away from the battery cell 20 and the inner side close to the battery cell 20, and the connecting segment 32 is penetrated in the pole through hole 12, so that when the first pole assembly 30 is installed, the first pole assembly 30 can be reliably fixed to the first housing segment 11 by using the riveted segment 31 and the limiting segment 33, thereby reducing the risk of the first pole assembly 30 being separated from the first housing segment 11. A recess 34 is formed on one side of the connecting section 32 facing the riveting section 31, which makes the bottom structural strength of the first pole assembly 30 relatively weak, that is, the structural strength of the limiting section 33 is relatively weak, and the limiting section 33 has a greater risk of deformation under force, and the first housing section 11 has two opposite first edges 111 and two opposite second edges 112, the length of the first edge 111 is greater than the length of the second edge 112, the limiting section 33 is unevenly positioned relative to the first edge 111 and the second edge 112 of the first housing section 11, and the limiting section 33 is not uniformly positioned relative to the first edge 111 and the second edge 112 of the first housing section 11. The force balance is relatively poor, and the limit segment 33 is more easily deformed by the force. By making the shortest distance between the limit segment 33 and the first edge 111 a, and the shortest distance between the limit segment 33 and the second edge 112 b, and a / b is 0.06-3, the risk of serious deformation of the first shell segment 11 caused by deformation of the limit segment 33 after the internal structure of the battery collides with the limit segment 33 can be reduced, thereby avoiding the first shell segment 11 from having a structural imbalance and weak stability, thereby ensuring the structural stability of the battery shell 10, and reliably improving the safe use performance of the battery.

[0029] It should be noted that if Figures 1 to 10 As shown, the battery housing 10 includes a first housing segment 11 , and the first pole assembly 30 is disposed on the first housing segment 11 .

[0030] Combination Figure 4 and Figure 5 As shown, a pole through hole 12 is provided on the first housing segment 11 , and the first pole assembly 30 is inserted into the pole through hole 12 .

[0031] Combination Figure 2 As shown, the battery cell 20 includes a battery cell body 21 and a battery cell lead-out terminal 22 . The battery cell lead-out terminal 22 is led out from the battery cell body 21 , so that the battery cell lead-out terminal 22 can be electrically connected to the first pole assembly 30 .

[0032] Combination Figures 3 to 8as well as Fig.10 As shown, the first pole assembly 30 includes a riveted section 31, a connecting section 32 and a limiting section 33. The connecting section 32 connects the riveted section 31 and the limiting section 33. The riveted section 31 and the limiting section 33 are respectively located on the outer side of the first shell section 11 away from the battery cell 20 and the inner side close to the battery cell 20, that is, the riveted section 31 can be a structure formed by flanging after the first pole assembly 30 is installed on the first shell section 11, thereby ensuring that the riveted section 31 and the limiting section 33 are fixed on the first shell section 11.

[0033] Combination Figures 3 to 8 As shown, the connecting section 32 is inserted into the pole through hole 12, and a recess 34 is formed on the side of the connecting section 32 facing the riveted section 31. The setting of the recess 34 can form the riveted section 31 by flanging after the first pole assembly 30 is installed on the first shell section 11, so that the riveted section 31 and the limiting section 33 can clamp the first shell section 11, thereby realizing the installation and fixation of the first pole assembly 30.

[0034] The riveted section 31, the connecting section 32 and the limiting section 33 are an integrally formed structure, so that the first pole assembly 30 can be installed from the inside of the battery housing 10, so that a part of the first pole assembly 30 passes through the battery housing 10, and the riveted section 31 is formed by flanging processing, thereby fixing the first pole assembly 30.

[0035] Combination Figure 2 As shown, the first shell segment 11 has two opposite first edges 111 and two opposite second edges 112, and the length of the first edge 111 is greater than the length of the second edge 112, that is, the first shell segment 11 can be considered to be a substantially rectangular structure. The battery is a quadrangular prism-type battery, and a recess 34 is formed at the top of the first pole assembly 30, thereby making the structural strength of the bottom of the first pole assembly 30 weaker, and the risk of deformation under stress is greater, especially the battery is a quadrangular prism-type battery, the length and width of the first shell segment 11 are not equal, and the position is uneven; while the distance between the limiting segment of the cylindrical battery and the edge of the end face of the cylindrical shell is the same, so the force is consistent and the strength is higher. Therefore, the limiting segment 33 of the battery in this embodiment is more susceptible to deformation under stress than the cylindrical battery. Therefore, by controlling the ratio of the shortest distance a between the limiting segment 33 and the first edge 111 to the shortest distance b between the limiting segment 33 and the second edge 112, the risk of deformation under stress of the limiting segment 33 can be reduced, thereby reducing the risk of deformation under stress of the first shell segment 11, and improving the safe use performance of the battery.

[0036] Figure 2The structure shown in can be considered as a projection view formed by the inner surface of the first shell segment 11 and the first pole assembly 30, wherein the shortest distance between the limit segment 33 and the first edge 111 can be expressed as a, and the shortest distance between the limit segment 33 and the second edge 112 can be expressed as b, and a / b is 0.06-3, which can effectively reduce the impact of the internal structure of the battery on the limit segment 33, causing serious deformation of the first shell segment 11, and avoid the imbalance and weak stability of the first shell segment 11 structure, which in turn causes the risk of connection failure of the battery shell 10, thereby effectively improving the overall structural safety performance of the battery.

[0037] The ratio of the shortest distance a between the limiting segment 33 and the first edge 111 to the shortest distance b between the limiting segment 33 and the second edge 112 can be 0.06, 0.07, 0.08, 0.09, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9 or 3, etc.

[0038] In one embodiment, the shortest distance between the limiting section 33 and the first edge 111 is a, 2mm≤a≤30mm. On the basis of rationally utilizing the width space of the first shell section 11, the first pole assembly 30 is ensured to have reliable current-carrying capacity, and a certain insulation distance can be ensured between the limiting section 33 and the side wall section 13 connecting the battery shell 10 and the first shell section 11, thereby reducing the risk of battery insulation failure.

[0039] The shortest distance a between the limiting segment 33 and the first edge 111 can be 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 37mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 15.5mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 25.5mm, 26mm, 27mm, 28mm, 29mm or 30mm, etc.

[0040] In one embodiment, the shortest distance between the limiting section 33 and the second edge 112 is b, 10mm≤b≤34mm, so that the first pole assembly 30 can be reasonably arranged on the first housing section 11, and a reasonable creepage distance can be provided between the first pole assembly 30 and the side wall section 13 of the battery housing 10, thereby improving the safety performance of the battery. The risk of deformation of the limiting section 33 under stress can also be further controlled, thereby reducing the risk of deformation of the first housing section 11 under stress, thereby improving the safe use performance of the battery.

[0041] The shortest distance b between the limiting segment 33 and the second edge 112 can be 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 15.5mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 25.5mm, 26mm, 27mm, 28mm, 29mm, 30mm, 30.5mm, 31mm, 32mm, 33mm or 34mm, etc.

[0042] In one embodiment, Figure 5 As shown, a through hole 36 is provided on the side of the first pole assembly 30 facing the battery cell 20, and the through hole 36 is connected to the recess 34. The through hole 36 is an injection hole, so that the battery can be injected with electrolyte through the first pole assembly 30, thereby improving the use range of the first pole assembly 30 and appropriately reducing the weight of the first pole assembly 30.

[0043] Among them, along the direction perpendicular to the large surface of the first shell segment 11, the minimum vertical distance between the through hole 36 and the first shell segment 11 is c, and c is 0-3mm, so as to avoid the injection hole being too large from the first shell segment 11, which makes the electrolyte impact force larger during the electrolyte injection process. The large surface of the first shell segment 11 can be considered as the surface with the largest area of ​​the first shell segment 11, and the direction perpendicular to the large surface of the first shell segment 11 can be considered as the thickness direction of the first shell segment 11.

[0044] Combination Figure 5 As shown, the minimum vertical distance between the through hole 36 and the first shell segment 11 can be expressed as c, and the minimum vertical distance c between the through hole 36 and the first shell segment 11 can be 0, 0.1mm, 0.2mm, 0.3mm, 0.5mm, 0.8mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.5mm, 1.8mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.5mm, 2.8mm or 3mm, etc.

[0045] In one embodiment, the area enclosed by the circumferential outer edge of the first shell segment 11 is S, the area enclosed by the circumferential outer edge of the positive projection of the limiting segment 33 on the first shell segment 11 is S1, and S1 / S is 0.05-0.5, which can not only ensure the structural strength of the limiting segment 33, but also reduce the risk of deformation of the first shell segment 11, thereby improving the safe use performance of the battery.

[0046] Combination Figure 2 and Figure 3 As shown, the area S enclosed by the circumferential outer edge of the first shell segment 11 can be considered as the area enclosed by the two first edges 111 and the two second edges 112, that is, the area of ​​the inner surface 113 of the first shell segment 11 facing the battery cell 20, and the area S1 enclosed by the circumferential outer edge of the positive projection of the limiting segment 33 on the first shell segment 11 can be expressed as the positive projection area of ​​the first pole assembly 30 on the inner surface 113 of the first shell segment 11. The ratio of the area S1 enclosed by the circumferential outer edge of the orthographic projection of the limiting segment 33 on the first shell segment 11 to the area S enclosed by the circumferential outer edge of the first shell segment 11 is too small, the strength of the limiting segment 33 is weak, and the risk of deformation of the first shell segment 11 is relatively high; the ratio of the area S1 enclosed by the circumferential outer edge of the orthographic projection of the limiting segment 33 on the first shell segment 11 to the area S enclosed by the circumferential outer edge of the first shell segment 11 is too large, the overall space utilization rate inside the battery is poor, and the limiting segment 33 is close to the circumferential outer edge of the first shell segment 11, so there is a risk of battery short circuit.

[0047] The ratio of the area S1 enclosed by the circumferential outer edge of the positive projection of the limiting segment 33 on the first shell segment 11 to the area S enclosed by the circumferential outer edge of the first shell segment 11 can be 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45 or 0.5, etc.

[0048] In one embodiment, the length of the first edge 111 is L, the length of the second edge 112 is W, and W / L is 0.05-0.85, thereby ensuring the overall structural strength of the first shell segment 11 and reducing the probability of structural imbalance of the first pole assembly 30, thereby improving the safe use performance of the battery.

[0049] Combination Figure 2As shown, the length of the first edge 111 is represented as L, and the length of the second edge 112 is represented as W. The ratio of the length W of the second edge 112 to the length L of the first edge 111 is too small, and the overall structure of the first pole assembly 30 is unbalanced. When the gas generation inside the battery is serious, it will hit the weak part of the limit section 33, causing the first shell section 11 to deform as a whole, and the risk of fracture in the length direction of the first shell section 11 is relatively high. However, the ratio of the length W of the second edge 112 to the length L of the first edge 111 is too large, and the overall thickness dimension of the battery is relatively large. The heat transfer inside the battery cell 20 is relatively slow, and the pole piece of the battery cell 20 needs to be transferred to the battery shell 10 through more layers of diaphragms. The heat generation inside the battery is serious, and the risk of deformation of the limit section 33 is relatively high, which leads to the safety risk of deformation of the battery shell 10 and thermal runaway inside the battery.

[0050] The ratio of the length W of the second edge 112 to the length L of the first edge 111 can be 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8 or 0.85, etc.

[0051] In one embodiment, the length of the first edge 111 is L, L≤700 mm, thereby preventing the first shell segment 11 from being too long, which would result in a weak overall structural strength of the first shell segment 11 .

[0052] In one embodiment, L≤400 mm, so that the structural strength of the first shell segment 11 can be further controlled, the risk of damage to the battery shell 10 can be reduced, thereby improving the safe use performance of the battery and controlling the balancing ability of the first pole assembly 30 on the first shell segment 11.

[0053] It should be noted that the length L of the first edge 111 can be 700mm, 690mm, 680mm, 660mm, 650mm, 640mm, 620mm, 600mm, 590mm, 580mm, 560mm, 550mm, 540mm, 520mm, 500mm, 490mm, 480mm, 460mm, 450mm, 440mm, 420mm, 400mm, 390mm, 380mm, 360mm, 350mm, 340mm, 320mm or 300mm, etc.

[0054] In one embodiment, Figure 1 , Figure 2 as well as Fig. 9As shown, the battery also includes a second pole assembly 40, which is arranged on the first shell segment 11. Along the extension direction of the first edge 111, the distance between the side of the first pole assembly 30 facing the battery cell 20 and the side of the second pole assembly 40 facing the battery cell 20 is D, the length of the first edge 111 is L, and D / L is 0.3-0.99, which can not only ensure that there is a sufficient insulation gap between the first pole assembly 30 and the second pole assembly 40, thereby reducing the short circuit risk between the first pole assembly 30 and the second pole assembly 40, but also avoid the high risk of deformation of the first shell segment 11 between the first pole assembly 30 and the second pole assembly 40, thereby improving the safe use performance of the battery.

[0055] The battery cell 20 includes a battery cell body 21 and a battery cell lead-out terminal 22. There may be two battery cell lead-out terminals 22, and the polarities of the two battery cell lead-out terminals 22 are opposite. The polarities of the first pole assembly 30 and the second pole assembly 40 are opposite. The two battery cell lead-out terminals 22 can be connected to the first pole assembly 30 and the second pole assembly 40 respectively.

[0056] Combination Figure 2 As shown, the distance between the side of the first pole assembly 30 facing the battery cell 20 and the side of the second pole assembly 40 facing the battery cell 20 can be expressed as D, Figure 2 It can be considered as the positive projection of the first pole assembly 30 and the second pole assembly 40 on the inner surface of the first housing segment 11. Figure 3 As shown, the inner surface 113 of the first housing segment 11 is the surface of the first housing segment 11 facing the battery core 20 .

[0057] The ratio of the distance D between the side of the first pole assembly 30 facing the battery cell 20 and the side of the second pole assembly 40 facing the battery cell 20 to the length L of the first edge 111 can be 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.88, 0.9, 0.92, 0.95, 0.97 or 0.99, etc.

[0058] In one embodiment, the distance between the first pole assembly 30 and the second pole assembly 40 is D, D≤300mm, thereby effectively ensuring the insulation distance between the first pole assembly 30 and the second pole assembly 40, and also reducing the structural impact of the first pole assembly 30 and the second pole assembly 40 on the first shell segment 11, thereby improving the safe use performance of the battery.

[0059] The distance D between the first pole assembly 30 and the second pole assembly 40 may be 300 mm, 290 mm, 280 mm, 270 mm, 260 mm, 250 mm, 240 mm, 230 mm, 200 mm, 180 mm or 150 mm, etc.

[0060] In one embodiment, along the direction perpendicular to the large surface of the first shell segment 11, the minimum thickness of the limiting segment 33 is d1, the minimum thickness of the riveted segment 31 is d2, and d1 / d2 is 0.5-2, so that the structural strength of the limiting segment 33 and the riveted segment 31 can be controlled to ensure that the first pole assembly 30 is stably fixed on the first shell segment 11.

[0061] Combination Figure 4 As shown, along the direction perpendicular to the first housing segment 11, the minimum thickness of the limiting segment 33 is represented by d1, and the minimum thickness of the riveted segment 31 is represented by d2. If the ratio of the minimum thickness d1 of the limiting segment 33 to the minimum thickness d2 of the riveted segment 31 is too small, the limiting segment 33 cannot withstand a large impact force, and there may be a risk of structural damage. If the ratio of the minimum thickness d1 of the limiting segment 33 to the minimum thickness d2 of the riveted segment 31 is too large, the fixing strength of the riveted segment 31 to the first housing segment 11 is weak, which may cause the risk of the first pole assembly 30 being separated from the first housing segment 11.

[0062] The ratio of the minimum thickness d1 of the limiting section 33 to the minimum thickness d2 of the riveting section 31 may be 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9 or 2, etc.

[0063] In one embodiment, along the direction perpendicular to the first shell segment 11, the minimum thickness of the limiting segment 33 is d1, the wall thickness of the first shell segment 11 is d3, and d1 / d3 is 0.15-3, so that the structural strength of the limiting segment 33 and the first shell segment 11 can be effectively controlled, which can not only ensure that the first pole assembly 30 is stably fixed on the first shell segment 11, but also reduce the risk of deformation of the first shell segment 11.

[0064] Combination Figure 4 As shown, the wall thickness of the first housing segment 11 in the direction perpendicular to the large surface of the first housing segment 11 is represented as d3. The ratio of the minimum thickness d1 of the limiting segment 33 to the wall thickness d3 of the first housing segment 11 is too small, and the limiting segment 33 is difficult to withstand a large impact force, which may affect the fixing ability of the first pole assembly 30. However, if the ratio of the minimum thickness d1 of the limiting segment 33 to the wall thickness d3 of the first housing segment 11 is too large, the first housing segment 11 has a weak anti-deformation ability, there is a large deformation risk, and it is easy to cause safety risks of the battery.

[0065] The ratio of the minimum thickness d1 of the limiting section 33 to the wall thickness d3 of the first shell section 11 can be 0.15, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9 or 3, etc.

[0066] In one embodiment, Figures 3 to 10 As shown, the battery housing 10 also includes a side wall section 13, which is connected to the first housing section 11, and the first housing section 11 is perpendicular to the side wall section 13; wherein, the wall thickness of the first housing section 11 is d3, the wall thickness of the side wall section 13 is d4, and d3 / d4 is 1-20, thereby ensuring that the side wall section 13 and the first housing section 11 have a relatively balanced structural strength, reducing the risk of fracture between the side wall section 13 and the first housing section 11, and at the same time improving the connection strength between the first pole assembly 30 and the first housing section 11.

[0067] Combination Figure 4 As shown, the wall thickness of the side wall section 13 can be denoted as d4. The ratio of the wall thickness d3 of the first shell section 11 to the wall thickness d4 of the side wall section 13 can be 1, 1.2, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29 or 30, etc.

[0068] In one embodiment, the side wall segment 13 and the first shell segment 11 are an integrally formed structure, and the battery shell 10 also includes a second shell segment 14, which is arranged opposite to the first shell segment 11 and connected to an end of the side wall segment 13 away from the first shell segment 11, that is, the first pole assembly 30 can be connected to the first shell segment 11 which is integrally formed with the side wall segment 13, thereby improving the space utilization of the battery.

[0069] Combination Figure 1 as well as Figures 4 to 10 As shown, the side wall segment 13 and the first shell segment 11 are an integrally formed structure, the second shell segment 14 can be formed independently, and the second shell segment 14 can be welded to the side wall segment 13 .

[0070] In one embodiment, the side wall segment 13 is welded to the first shell segment 11, and the battery shell 10 also includes a second shell segment 14, which is arranged opposite to the first shell segment 11 and connected to one end of the side wall segment 13 away from the first shell segment 11, that is, the first pole assembly 30 can be arranged on an independent first shell segment 11, which can facilitate the arrangement of the first pole assembly 30, thereby improving the manufacturing efficiency of the battery.

[0071] Combination Figure 3 As shown, the first shell segment 11 can be independently provided with the side wall segment 13 , and the side wall segment 13 can be an integrally formed structure with the second shell segment 14 , or the side wall segment 13 can be an independent structure with the second shell segment 14 .

[0072] In one embodiment, along the direction perpendicular to the large surface of the first shell segment 11, the minimum thickness of the limiting segment 33 is d1, the depth of the recess 34 is h1, and d1 / h1 is 0.125-6, which can not only effectively control the height dimension of the first pole assembly 30, but also control the deformation risk of the first shell segment 11 through the first pole assembly 30.

[0073] Combination Figure 4 As shown, along the direction perpendicular to the large surface of the first housing segment 11, the minimum thickness of the limit segment 33 can be expressed as d1, and the depth of the recess 34 can be expressed as h1. The ratio of the minimum thickness d1 of the limit segment 33 to the depth h1 of the recess 34 is too small, the pressure-bearing end of the limit segment 33 is weak, and the structural strength of the overlapped position of the projection of the limit segment 33 and the recess 34 is weak, resulting in serious deformation of the first housing segment 11; the ratio of the minimum thickness d1 of the limit segment 33 to the depth h1 of the recess 34 is too large, the overall size of the first pole assembly 30 is large, and the overall space utilization of the battery is reduced.

[0074] The ratio of the minimum thickness d1 of the limiting section 33 to the depth h1 of the recess 34 can be 0.125, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3, 3.2, 3.5, 3.8, 4, 4.2, 4.5, 4.7, 4.8, 5, 5.2, 5.5, 5.7, 5.8 or 6, etc.

[0075] In one embodiment, along the direction perpendicular to the large surface of the first shell segment 11, the depth of the recess 34 is h1, h1 is 0.5mm-4mm, and a / b is 0.1-2.9, which can facilitate the forming of the riveted segment 31 and improve the installation efficiency of the first pole assembly 30, and can also avoid the problem of weakened structural strength due to excessive depth of the recess 34. By controlling the ratio of the shortest distance a between the limiting segment 33 and the first edge 111 to the shortest distance b between the limiting segment 33 and the second edge 112, the position of the limiting segment 33 relative to the first edge 111 and the second edge 112 of the first shell segment 11 can be made more balanced, thereby reducing the risk of deformation of the limiting segment 33 due to force, thereby reducing the risk of deformation of the first shell segment 11.

[0076] If the depth h1 of the recess 34 is too small, the riveted section 31 is difficult to deform quickly and is not easy to be fixed on the first housing section 11. If the depth h1 of the recess 34 is too large, the deformation risk of the first pole assembly 30 increases, which is not conducive to ensuring the safety performance of the battery. The depth h1 of the recess 34 can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.2mm, 1.4mm, 1.5mm, 1.7mm, 1.8mm, 2mm, 2.5mm, 2.8mm, 3mm, 3.5mm, 3.6mm, 3.8mm or 4mm, etc.

[0077] In one embodiment, Figure 4 As shown, a receiving groove 35 is provided at one end of the first pole assembly 30 away from the battery cell 20, and the receiving groove 35 is connected to the recess 34, thereby further facilitating the molding of the first pole assembly 30, thereby improving the manufacturing efficiency of the battery.

[0078] In one embodiment, Figure 4 As shown, the battery also includes a shielding member 50, at least part of which is located in the accommodating groove 35 to block the recess 34. The shielding member 50 can strengthen the structure of the riveted section 31, avoid the force transmitted by the limiting section 33 from damaging the riveted section 31, increase the overall force-bearing area and thus reduce the pressure, thereby improving the safe use performance of the battery.

[0079] In one embodiment, the shielding member 50 is welded to the first pole assembly 30, which not only ensures the connection strength between the shielding member 50 and the first pole assembly 30, but also increases the current carrying capacity of the first pole assembly 30, thereby facilitating the subsequent connection of the shielding member 50 to the bus when the batteries are grouped.

[0080] The shielding member 50 and the recess 34 can be matched, and the shielding member 50 and the riveted section 31 can be welded, for example, the shielding member 50 and the riveted section 31 can be laser welded, or the shielding member 50 and the riveted section 31 can be resistance welded, or the shielding member 50 and the riveted section 31 can be ultrasonically welded, etc.

[0081] In one embodiment, along the extension direction of the first edge 111 , the maximum dimension of the accommodating groove 35 is greater than the maximum dimension of the recess 34 , thereby increasing the size of the shielding member 50 and further improving the structural reinforcement of the shielding member 50 on the first pole assembly 30 .

[0082] In one embodiment, along the extension direction of the first edge 111, the ratio of the maximum size of the accommodating groove 35 to the maximum size of the recess 34 is 1-3, thereby effectively controlling the structural strength of the shielding member 50 and the first pole assembly 30, thereby avoiding the risk of uneven voltage distribution leading to reduced battery safety performance.

[0083] The ratio of the maximum size of the accommodating groove 35 to the maximum size of the recess 34 is too small, the overall strength of the shielding member 50 and the first pole assembly 30 is weak, and the pressure division is not obvious; the ratio of the maximum size of the accommodating groove 35 to the maximum size of the recess 34 is too large, and the end face size of the shielding member 50 is large, resulting in a reduction in the overall fixing area of ​​the riveted section 31 to the first shell section 11, resulting in a weakening of the strength of the riveted section 31, which is not conducive to improving the fixing performance.

[0084] The ratio of the maximum dimension of the accommodating groove 35 to the maximum dimension of the recess 34 can be 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9 or 3, etc.

[0085] In one embodiment, Figures 4 to 8 As shown, the battery further includes an insulating member 60 , which is disposed between the first pole assembly 30 and the first casing segment 11 , thereby ensuring the insulation performance between the first pole assembly 30 and the first casing segment 11 and also forming a seal.

[0086] The insulating member 60 includes an elastic portion, so as to form a buffer protection between the first pole assembly 30 and the first housing segment 11 , thereby reducing the risk of deformation of the first housing segment 11 .

[0087] The insulating part 60 may include a plastic part, or the insulating part 60 may include a rubber part, etc., which is not limited here. The insulating part 60 may be located between the limiting section 33 and the first shell section 11, the insulating part 60 may be located between the connecting section 32 and the first shell section 11, and the insulating part 60 may be located between the riveting section 31 and the first shell section 11.

[0088] The insulating member 60 may be an integrally formed structure, or the insulating member 60 may include a plurality of independent structures, which is not limited herein.

[0089] In one embodiment, the compression amount of the insulating member 60 is 10%-50%, which can not only ensure the effective sealing of the insulating member 60 between the first pole assembly 30 and the first housing segment 11 , but also ensure that the insulating member 60 has a reliable buffering capability.

[0090] The amount of compression of the insulation 60 may be 10%, 12%, 15%, 18%, 20%, 22%, 25%, 28%, 30%, 32%, 35%, 38%, 40%, 42%, 45%, 48% or 50%, etc.

[0091] In one embodiment, the thickness of the insulating member 60 is 0.5 mm-1.5 mm, which ensures the insulation distance between the first pole assembly 30 and the first housing segment 11 and also buffers the deformation of the first pole assembly 30 to avoid serious deformation of the first housing segment 11 .

[0092] The thickness of the insulating member 60 may be 0.5 mm, 0.6 mm, 0.8 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, or the like.

[0093] In one embodiment, the insulating member 60 is disposed between the limiting segment 33 and the first housing segment 11 , so that the insulating member 60 can effectively buffer the limiting segment 33 , thereby reliably improving the safe use performance of the first housing segment 11 .

[0094] In one embodiment, Fig. 9 and Fig.10 As shown, a through hole 36 is provided on the side of the first pole assembly 30 facing the battery cell 20, and the through hole 36 is connected to the recess 34; wherein, the battery cell lead-out terminal 22 is passed through the through hole 36, thereby facilitating the connection between the battery cell lead-out terminal 22 and the first pole assembly 30, and ensuring that there is a reliable current flow area between the battery cell lead-out terminal 22 and the first pole assembly 30.

[0095] In one embodiment, the cell lead-out terminal 22 is connected to the limiting section 33 , so that the connection between the cell lead-out terminal 22 and the limiting section 33 can be easily achieved, thereby ensuring the electrical connection between the cell lead-out terminal 22 and the first pole assembly 30 .

[0096] In one embodiment, the battery cell lead-out terminal 22 is welded to the limiting segment 33 to form a weld mark 221, and the weld mark 221 and the recess 34 do not overlap in their positive projection on the first shell segment 11, thereby avoiding the risk of deformation of the weak part of the limiting segment 23 caused by the vibration of the battery cell 20, thereby ensuring the connection strength between the battery cell lead-out terminal 22 and the limiting segment 33, and ensuring that the first pole assembly 30 is reliably fixed on the first shell segment 11.

[0097] In one embodiment, the battery cell lead-out terminal 22 is welded to the limiting segment 33 to form a weld mark 221, and the weld mark 221 and the orthographic projection of the recess 34 on the first shell segment 11 partially overlap, and the overlapping area of ​​the weld mark 221 and the orthographic projection of the recess 34 on the first shell segment 11 is smaller than the non-overlapping area of ​​the orthographic projection of the weld mark 221 and the orthographic projection of the recess 34. This not only ensures that there is a reliable welding area between the battery cell lead-out terminal 22 and the limiting segment 33, but also avoids affecting the structural strength of the limiting segment 33 during the welding process between the battery cell lead-out terminal 22 and the limiting segment 33, thereby effectively improving the safe use performance of the battery.

[0098] The overlapping area of ​​the orthographic projections of the weld mark 221 and the recess 34 on the first shell segment 11 is smaller than the non-overlapping area of ​​the orthographic projections of the weld mark 221 and the recess 34, that is, it can be considered that, for example, the orthographic projection area of ​​the weld mark 221 on the first shell segment 11 is m, and the overlapping area of ​​the orthographic projections of the weld mark 221 and the recess 34 on the first shell segment 11 is n. At this time, the non-overlapping area of ​​the orthographic projections of the weld mark 221 and the recess 34 is mn, and the overlapping area of ​​the orthographic projections of the weld mark 221 and the recess 34 on the first shell segment 11 is smaller than the non-overlapping area of ​​the orthographic projections of the weld mark 221 and the recess 34, that is, n<mn.

[0099] It should be noted that, combined with Figure 3 As shown, the cell lead-out terminal 22 and the limiting segment 33 are welded to form a weld mark 221, thereby ensuring the connection strength between the cell lead-out terminal 22 and the limiting segment 33, and further ensuring the current flow capacity between the cell lead-out terminal 22 and the limiting segment 33. The cell lead-out terminal 22 and the limiting segment 33 can be laser welded, or the cell lead-out terminal 22 and the limiting segment 33 can be ultrasonic welded, or the cell lead-out terminal 22 and the limiting segment 33 can be resistance welded.

[0100] In one embodiment, Figure 7 As shown, the cell lead-out terminal 22 is a pole ear portion 222 formed by at least two single-piece pole ears, and the pole ear portion 222 can be directly electrically connected to the first pole column assembly 30, thereby reducing the number of battery components used and improving battery space utilization.

[0101] In one embodiment, Figure 8 As shown, the battery cell lead-out terminal 22 includes a pole ear portion 222 and an electrical connecting sheet 223. The electrical connecting sheet 223 electrically connects the pole ear portion 222 and the first pole column assembly 30, thereby facilitating the electrical connection between the pole ear portion 222 and the first pole column assembly 30, and can adapt to the lead-out direction of the pole ear portion 222, thereby improving the manufacturing efficiency of the battery.

[0102] It should be noted that the battery includes a cell and an electrolyte, which is the smallest unit capable of performing electrochemical reactions such as charge / discharge. A cell refers to a unit formed by winding or laminating a stacked portion, the stacked portion including a first pole sheet, a separator, and a second pole sheet. When the first pole sheet is a positive pole sheet, the second pole sheet is a negative pole sheet. The polarities of the first pole sheet and the second pole sheet can be interchanged. The first pole sheet and the second pole sheet are coated with an active material.

[0103] In one embodiment, the battery may be a quadrangular prism battery. A quadrangular prism battery mainly refers to a battery having a prism shape, but it is not strictly limited whether each side of the prism must be a straight line in the strict sense, and the corners between the sides are not necessarily right angles, and can be arc transitions.

[0104] The battery can be a laminated battery, which is not only convenient to group, but also can be processed to obtain a longer battery. Specifically, the battery cell is a laminated battery cell, which has a first pole piece stacked on top of each other, a second pole piece with electrical properties opposite to the first pole piece, and a diaphragm sheet arranged between the first pole piece and the second pole piece, so that multiple pairs of first pole pieces and second pole pieces are stacked to form a laminated battery cell.

[0105] Alternatively, the battery may be a wound battery, that is, a first pole sheet, a second pole sheet with electrical properties opposite to the first pole sheet, and a diaphragm sheet arranged between the first pole sheet and the second pole sheet are wound to obtain a wound battery cell.

[0106] An embodiment of the utility model further provides a battery pack, which includes batteries.

[0107] A battery of a battery pack of an embodiment of the utility model comprises a battery housing 10, a battery cell 20 and a first pole assembly 30, wherein the battery cell 20 is arranged in the battery housing 10, the first pole assembly 30 is arranged on the battery housing 10, and the battery cell 20 is electrically connected to the first pole assembly 30. A pole through hole 12 is arranged on the first housing segment 11 of the battery housing 10, and the first pole assembly 30 comprises an integrally formed riveted segment 31, a connecting segment 32 and a limiting segment 33, a recess 34 is formed on the side of the connecting segment 32 facing the riveted segment 31, the riveted segment 31 and the limiting segment 33 are respectively located on the outer side of the first housing segment 11 away from the battery cell 20 and the inner side close to the battery cell 20, and the connecting segment 32 is penetrated in the pole through hole 12, so that when the first pole assembly 30 is installed, the first pole assembly 30 can be reliably fixed to the first housing segment 11 by using the riveted segment 31 and the limiting segment 33, thereby reducing the risk of the first pole assembly 30 being separated from the first housing segment 11. A recess 34 is formed on one side of the connecting section 32 facing the riveting section 31, which makes the bottom structural strength of the first pole assembly 30 relatively weak, that is, the structural strength of the limiting section 33 is relatively weak, and the limiting section 33 has a greater risk of deformation under force, and the first housing section 11 has two opposite first edges 111 and two opposite second edges 112, the length of the first edge 111 is greater than the length of the second edge 112, the limiting section 33 is unevenly positioned relative to the first edge 111 and the second edge 112 of the first housing section 11, and the limiting section 33 is not uniformly positioned relative to the first edge 111 and the second edge 112 of the first housing section 11. The force balance is relatively poor, and the limit segment 33 is more easily deformed by the force. By making the shortest distance between the limit segment 33 and the first edge 111 a, and the shortest distance between the limit segment 33 and the second edge 112 b, and a / b is 0.06-3, the risk of serious deformation of the first shell segment 11 caused by deformation of the limit segment 33 after the internal structure of the battery collides with the limit segment 33 can be reduced, thereby avoiding the first shell segment 11 from having a structural imbalance and weak stability, thereby ensuring the structural stability of the battery shell 10, and reliably improving the safe use performance of the battery pack.

[0108] In one embodiment, the battery pack is a battery module or a battery pack.

[0109] The battery module includes a plurality of batteries, and the battery module may further include an end plate and a side plate, and the end plate and the side plate are used to fix the plurality of batteries.

[0110] It should be noted that multiple batteries can be arranged in a battery box after forming a battery module, and multiple batteries can be fixed by end plates and side plates. Multiple batteries can be directly arranged in the battery box, that is, there is no need to group multiple batteries, in which case the end plates and side plates can be removed.

[0111] Those skilled in the art will readily come up with other embodiments of the present disclosure after considering the specification and practicing the utility model disclosed herein. The present disclosure is intended to cover any variation, use or adaptation of the present utility model, which follows the general principles of the present disclosure and includes common knowledge or customary technical means in the art that are not disclosed in the present disclosure. The specification and example embodiments are to be regarded as exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

[0112] It should be understood that the present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from its scope. The scope of protection of the present disclosure is limited only by the appended claims.

Claims

1. A battery, characterized in that: include: A battery housing (10), the battery housing (10) comprising a first housing section (11), the first housing section (11) being provided with a pole through hole (12); A battery cell (20), the battery cell (20) being arranged in the battery housing (10), the battery cell (20) comprising a battery cell body (21) and a battery cell lead-out terminal (22), the battery cell lead-out terminal (22) being led out from the battery cell body (21); A first pole assembly (30), the first pole assembly (30) being arranged on the first housing section (11), the battery cell lead-out terminal (22) being electrically connected to the first pole assembly (30), the first pole assembly (30) comprising a riveted section (31), a connecting section (32) and a limiting section (33), the connecting section (32) connecting the riveted section (31) and the limiting section (33), the riveted section (31) and the limiting section (33) being respectively located on the outer side of the first housing section (11) away from the battery cell (20) and the inner side close to the battery cell (20), at least part of the connecting section (32) being inserted into the pole through hole (12), a recess (34) being formed on one side of the connecting section (32) facing the riveted section (31), the riveted section (31), the connecting section (32) and the limiting section (33) being an integrally formed structure; The first shell section (11) has two opposite first edges (111) and two opposite second edges (112), the length of the first edge (111) is greater than the length of the second edge (112), the shortest distance between the limiting section (33) and the first edge (111) is a, the shortest distance between the limiting section (33) and the second edge (112) is b, and a / b is 0.06-3.

2. The battery according to claim 1, characterized in that 2mm≤a≤30mm, and / or, 10mm≤b≤34mm.

3. The battery according to claim 1, characterized in that A through hole (36) is provided on a side of the first pole assembly (30) facing the battery core (20), the through hole (36) is connected to the recess (34), and the through hole (36) is a liquid injection hole; Wherein, along the direction perpendicular to the large surface of the first shell segment (11), the minimum vertical distance between the through hole (36) and the first shell segment (11) is c, and c is 0-3 mm.

4. The battery according to claim 1, characterized in that The area enclosed by the circumferential outer edge of the first shell segment (11) is S, the area enclosed by the circumferential outer edge of the orthographic projection of the limiting segment (33) on the first shell segment (11) is S1, and S1 / S is 0.05-0.

5.

5. The battery according to claim 1, characterized in that The length of the first edge (111) is L, the length of the second edge (112) is W, and W / L is 0.05-0.

85.

6. The battery according to claim 5, characterized in that L≤700mm.

7. The battery according to claim 6, characterized in that L≤400mm.

8. The battery according to claim 1, characterized in that The battery further comprises a second pole assembly (40), the second pole assembly (40) being arranged on the first shell segment (11), and along the extension direction of the first edge (111), a distance between a side of the first pole assembly (30) facing the battery cell (20) and a side of the second pole assembly (40) facing the battery cell (20) is D, a length of the first edge (111) is L, and D / L is 0.3-0.

99.

9. The battery according to claim 8, characterized in that D≤300mm.

10. The battery according to claim 1, characterized in that In a direction perpendicular to the large surface of the first shell section (11), the minimum thickness of the limiting section (33) is d1, the minimum thickness of the riveting section (31) is d2, and d1 / d2 is 0.5-2.

11. The battery according to claim 1, characterized in that Along a direction perpendicular to the large surface of the first shell segment (11), the minimum thickness of the limiting segment (33) is d1, the wall thickness of the first shell segment (11) is d3, and d1 / d3 is 0.15-3.

12. The battery according to claim 1, characterized in that The battery housing (10) further comprises a side wall section (13), wherein the side wall section (13) is connected to the first housing section (11), and the first housing section (11) is perpendicular to the side wall section (13); The wall thickness of the first shell section (11) is d3, the wall thickness of the side wall section (13) is d4, and d3 / d4 is 1-20.

13. The battery according to claim 12, characterized in that The side wall section (13) and the first housing section (11) are of an integrally formed structure, and the battery housing (10) further comprises a second housing section (14), the second housing section (14) being arranged opposite to the first housing section (11) and connected to an end of the side wall section (13) away from the first housing section (11); Alternatively, the side wall section (13) is welded to the first shell section (11), and the battery shell (10) further comprises a second shell section (14), the second shell section (14) being arranged opposite to the first shell section (11) and connected to an end of the side wall section (13) away from the first shell section (11).

14. The battery according to claim 1, characterized in that Along a direction perpendicular to the large surface of the first shell segment (11), the minimum thickness of the limiting segment (33) is d1, the depth of the recess (34) is h1, and d1 / h1 is 0.125-6.

15. The battery according to claim 1, characterized in that Along the direction perpendicular to the large surface of the first shell segment (11), the depth of the recess (34) is h1, h1 is 0.5 mm-4 mm, and a / b is 0.1-2.

9.

16. The battery according to claim 1, characterized in that An accommodation groove (35) is provided at one end of the first pole assembly (30) away from the battery core (20), and the accommodation groove (35) is communicated with the recess (34).

17. The battery according to claim 16, characterized in that The battery further comprises a shielding member (50), at least a portion of which is located in the receiving groove (35) to block the recess (34).

18. The battery according to claim 17, characterized in that The shielding member (50) is connected to the first pole assembly (30) by welding.

19. The battery according to claim 17, characterized in that Along the extension direction of the first edge (111), the maximum dimension of the accommodating groove (35) is greater than the maximum dimension of the recess (34).

20. The battery according to claim 17, characterized in that Along the extension direction of the first edge (111), the ratio of the maximum dimension of the accommodating groove (35) to the maximum dimension of the recess (34) is 1-3.

21. The battery according to any one of claims 1 to 20, characterized in that The battery further comprises an insulating member (60), wherein the insulating member (60) is arranged between the first pole assembly (30) and the first casing segment (11); Wherein, the insulating member (60) comprises an elastic portion.

22. The battery according to claim 21, characterized in that The compression amount of the insulating member (60) is 10%-50%, and / or the thickness of the insulating member (60) is 0.5 mm-1.5 mm, and / or the insulating member (60) is arranged between the limiting section (33) and the first shell section (11).

23. The battery according to any one of claims 1 to 20, characterized in that A through hole (36) is provided on a side of the first pole assembly (30) facing the battery core (20), and the through hole (36) is connected to the recess (34); Wherein, the battery cell lead-out terminal (22) is arranged in the through hole (36).

24. The battery according to any one of claims 1 to 20, characterized in that The battery cell lead-out terminal (22) is connected to the limiting section (33).

25. The battery according to claim 24, characterized in that The battery cell lead-out terminal (22) is welded to the limiting section (33) to form a welding mark (221), and the orthographic projections of the welding mark (221) and the recess (34) on the first housing section (11) do not overlap; Alternatively, the battery cell lead-out terminal (22) is welded to the limiting section (33) to form a weld mark (221), the weld mark (221) and the orthographic projection of the recess (34) on the first shell section (11) partially overlap, and the overlapped area of ​​the weld mark (221) and the orthographic projection of the recess (34) on the first shell section (11) is smaller than the non-overlapped area of ​​the orthographic projection of the weld mark (221) and the orthographic projection of the recess (34).

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