Battery

Abstract

The utility model relates to the technical field of batteries, and provides a battery which comprises a shell structure, the shell structure comprises a cover plate assembly and a shell part, the shell part comprises an opening, the cover plate assembly is arranged on the shell part to seal the opening, and the shell part comprises a first side plate connected with the cover plate assembly, the first side plate comprises a body section and a protruding section arranged at the opening, the protruding section and the body section are arranged in the first direction, the minimum wall thickness of the protruding section is larger than the maximum wall thickness of the body section, and the difference between the maximum wall thickness of the protruding section and the minimum wall thickness of the protruding section is smaller than or equal to 0.04 mm; the battery core is arranged in the shell structure, the tab extends out of the battery core main body, the protruding section is arranged in a protruding mode towards one side of the battery core relative to the body section, the protruding section and the battery core main body are respectively provided with a first orthographic projection and a second orthographic projection on the same plane in the second direction, at least part of the first orthographic projection coincides with the second orthographic projection, and at least part of the second orthographic projection coincides with the first orthographic projection. And the thicker body section can fix the battery cell main body to prevent the battery cell from shaking.

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, a battery includes a battery case and a battery cell, and the battery cell is disposed inside the battery case. Due to structural limitations of the battery case and the battery cell themselves, the battery cell disposed inside the battery case may shake, thereby affecting the safe use 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 shell structure, the shell structure includes a cover plate assembly and a shell member, the shell member includes an opening, the cover plate assembly is arranged on the shell member to close the opening, the shell member includes a first side plate connected to the cover plate assembly, the first side plate includes a body section and a protruding section arranged at the opening, the protruding section and the body section are arranged along a first direction, the first direction is perpendicular to the large surface of the cover plate assembly, the minimum wall thickness of the protruding section is greater than the maximum wall thickness of the body section, and the difference between the maximum wall thickness of the protruding section and the minimum wall thickness of the protruding section is less than or equal to 0.04 mm;

[0006] A battery cell, the battery cell is arranged in a shell structure, the battery cell includes a battery cell body and a pole ear, the pole ear extends from the battery cell body, the protruding section protrudes toward one side of the battery cell compared to the main section, and along the second direction, the protruding section and the battery cell body have a first orthographic projection and a second orthographic projection on the same plane respectively, at least part of the first orthographic projection coincides with the second orthographic projection, and the second direction is the wall thickness direction of the protruding section.

[0007] The battery of the embodiment of the utility model includes a shell structure and a battery cell, and the battery cell is arranged in the shell structure, so that the shell structure forms protection for the battery cell. The cover plate assembly of the shell structure forms a closure for the opening of the shell member, and the first side plate of the shell member includes a protruding section and a main body section, the battery cell includes a battery cell body and a pole ear, the minimum wall thickness of the protruding section is greater than the maximum wall thickness of the main body section, and the difference between the maximum wall thickness of the protruding section and the minimum wall thickness of the protruding section is less than or equal to 0.04mm, by making the protruding section protrude relative to the main body section along the side facing the battery cell, and the protruding section and the battery cell body have a first orthographic projection and a second orthographic projection respectively on the same plane, at least part of the first orthographic projection coincides with the second orthographic projection, from The battery cell body can be overlapped with a relatively thick and uniformly thick protruding section. After the battery cell is installed in the shell, the thicker protruding section can fix the battery cell body to prevent the battery cell from shaking. At the same time, since the thicker protruding section clamps the battery cell, the risk of the battery cell body becoming loose can be prevented, and the movement of the pole ear in the shell structure can be reduced, thereby reducing the risk of short circuit. Moreover, since the protruding section has a gathering effect on the battery cell body, foreign matter can be prevented from entering the battery cell from the top, thereby further improving the safe use performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] 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:

[0009] Figure 1 is a schematic structural diagram of a battery according to an exemplary embodiment;

[0010] Figure 2 is a schematic cross-sectional structure diagram of a battery according to a first exemplary embodiment;

[0011] Figure 3 is a schematic cross-sectional structure diagram of a battery according to a second exemplary embodiment;

[0012] Figure 4 is a schematic cross-sectional structure diagram of a battery according to a third exemplary embodiment;

[0013] Figure 5 is a schematic diagram of a partial cross-sectional structure of a battery according to a fourth exemplary embodiment;

[0014] Figure 6is a schematic structural diagram of a battery housing of a battery from one perspective according to an exemplary embodiment;

[0015] Figure 7 is a schematic structural diagram of a battery housing of a battery from another perspective according to an exemplary embodiment;

[0016] Figure 8 is a schematic diagram of a partial structure of a battery casing of a battery according to an exemplary embodiment;

[0017] Fig. 9 is a schematic diagram of a partial structure of a first side plate of a battery according to an exemplary embodiment;

[0018] Fig.10 is a schematic diagram of a partial structure of a first side plate of a battery according to another exemplary embodiment;

[0019] Fig.11 is a schematic structural diagram of a battery cell according to an exemplary embodiment;

[0020] Fig.12 is a schematic diagram of a partial structure of a battery cell according to an exemplary embodiment;

[0021] Fig.13 is a schematic diagram of a partial structure of a battery cell according to another exemplary embodiment;

[0022] Fig.14 is a schematic diagram of a partial structure of a battery according to another exemplary embodiment.

[0023] The following are the descriptions of the reference numerals:

[0024] 10. Shell structure; 11. Cover plate assembly; 111. Cover plate; 112. Pole; 113. Insulating plate; 12. Shell member; 121. Opening; 122. First side plate; 1221. Protruding section; 1222. Main body section; 1223. First transition plate; 1224. Second transition plate; 123. Second side plate; 1231. Thin plate section; 1232. Thick plate section; 124. Arc side plate; 1241. First arc plate; 1242. Second arc plate; 125. Bottom plate; 20. Battery cell; 21. Battery cell body; 211. Positive electrode sheet; 212. Negative electrode sheet; 213. Diaphragm; 22. Pole ear. DETAILED DESCRIPTION

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] An embodiment of the present invention provides a battery. Figures 1 to 13The shell structure 10 includes a cover assembly 11 and a shell member 12. The shell member 12 includes an opening 121. The cover assembly 11 is arranged on the shell member 12 to close the opening 121. The shell member 12 includes a first side plate 122 connected to the cover assembly 11. The first side plate 122 includes a body section 1222 and a protruding section 1221 arranged at the opening 121. The protruding section 1221 and the body section 1222 are arranged along a first direction. The first direction is perpendicular to the large surface of the cover assembly 11. The minimum wall thickness of the protruding section 1221 is greater than the maximum wall thickness of the body section 1222. The protruding section 1221 The difference between the maximum wall thickness and the minimum wall thickness of the protruding section 1221 is less than or equal to 0.04 mm; the battery cell 20 is arranged in the shell structure 10, the battery cell 20 includes a battery cell body 21 and a pole ear 22, the pole ear 22 extends from the battery cell body 21, and the protruding section 1221 protrudes toward one side of the battery cell 20 compared to the main section 1222, and along the second direction, the protruding section 1221 and the battery cell body 21 have a first orthographic projection and a second orthographic projection on the same plane respectively, at least part of the first orthographic projection coincides with the second orthographic projection, and the second direction is the wall thickness direction of the protruding section 1221.

[0030] A battery according to an embodiment of the utility model includes a shell structure 10 and a battery cell 20, wherein the battery cell 20 is arranged in the shell structure 10, so that the shell structure 10 forms protection for the battery cell 20. The cover plate assembly 11 of the shell structure 10 forms a closure for the opening 121 of the shell member 12, and the first side plate 122 of the shell member 12 includes a protruding section 1221 and a body section 1222, the battery cell 20 includes a battery cell body 21 and a tab 22, the minimum wall thickness of the protruding section 1221 is greater than the maximum wall thickness of the body section 1222, and the difference between the maximum wall thickness of the protruding section 1221 and the minimum wall thickness of the protruding section 1221 is less than or equal to 0.04 mm, by making the protruding section 1221 protrude relative to the body section 1222 along a side facing the battery cell 20, and the protruding section 1221 and the battery cell body 21 have a first orthographic projection and a second orthographic projection respectively on the same plane, at least a portion of the first orthographic projection It overlaps with the second positive projection, so that the battery cell body 21 can overlap with the relatively thick and relatively uniformly thick protruding section 1221. After the battery cell 20 is loaded into the shell part 12, the thicker protruding section 1221 can fix the battery cell body 21 to prevent the battery cell 20 from shaking. At the same time, since the thicker protruding section 1221 clamps the battery cell 20, the risk of the battery cell body 21 becoming loose can be prevented, and the movement of the pole ear 22 in the shell structure 10 can also be reduced, thereby reducing the risk of short circuit. Moreover, since the protruding section 1221 has a gathering effect on the battery cell body 21, it can also prevent foreign matter from entering the battery cell 20 from the top, thereby further improving the safe use performance of the battery.

[0031] It should be noted that, combined with Figures 1 to 5As shown, the battery includes a shell structure 10 and a battery cell 20 , and the battery cell 20 is disposed in the shell structure 10 .

[0032] like Figure 1 and Figure 2 As shown, the housing structure 10 includes a cover assembly 11 and a housing member 12 . The housing member 12 includes an opening 121 . The cover assembly 11 is disposed on the housing member 12 to close the opening 121 , thereby providing sealed protection for the battery cells 20 inside the housing member 12 .

[0033] Combination Figure 2 , Figure 6 as well as Figure 7 As shown, the housing 12 includes a first side plate 122 , and the first side plate 122 is connected to the cover plate assembly 11 .

[0034] like Figure 5 , Figure 8 as well as Fig. 9 As shown, the first side plate 122 includes a protruding section 1221 and a main body section 1222. The protruding section 1221 is located on a side of the main body section 1222 close to the opening 121. The protruding section 1221 and the main body section 1222 are arranged along a first direction, that is, the protruding section 1221 is arranged closer to the cover plate assembly 11 than the main body section 1222.

[0035] The minimum wall thickness of the protruding section 1221 is greater than the maximum wall thickness of the main body section 1222, and the difference between the maximum wall thickness of the protruding section 1221 and the minimum wall thickness of the protruding section 1221 is less than or equal to 0.04 mm, that is, the wall thickness change rate of the protruding section 1221 is relatively small, that is, without considering manufacturing errors and structural deformation, the protruding section 1221 can be basically a uniform wall thickness structure. The difference between the maximum wall thickness of the protruding section 1221 and the minimum wall thickness of the protruding section 1221 can be 0.04 mm, 0.03 mm, 0.02 mm, 0.01 mm or 0, etc.

[0036] Combination Fig.11 As shown, the battery cell 20 includes a battery cell body 21 and a tab 22. The tab 22 extends from the battery cell body 21. The tab 22 may include a positive tab and a negative tab. The positive tab and the negative tab may be spaced apart. The tab 22 is used to connect to the pole structure, and the tab 22 is not part of the battery cell body 21.

[0037] Along the second direction, the protruding section 1221 is protruding relative to the main section 1222 along the side facing the battery cell 20, and the protruding section 1221 and the battery cell body 21 have a first orthographic projection and a second orthographic projection on the same plane, respectively, and at least a portion of the first orthographic projection coincides with the second orthographic projection, that is, the orthographic projection of the battery cell body 21 on the plane where the protruding section 1221 is located coincides with the protruding section 1221, and it can be considered that at least a portion of the protruding section 1221 can be arranged opposite to the battery cell body 21, so that the battery cell body 21 and the first side plate 122 can be thicker and have a uniform thickness. The protruding section 1221 overlaps with the protruding section 1221, and after the battery cell 20 is loaded into the shell member 12, the protruding section 1221 as the thickened area can cooperate with the thinned area on the edge of the battery cell body 21 to fix the battery cell 20 and prevent it from shaking. At the same time, since the protruding section 1221 clamps the battery cell 20, the diaphragm of the battery cell 20 can be prevented from being too loose, and the movement of the pole ear 22 in the shell structure 10 is reduced, thereby reducing the risk of short circuit. At the same time, the thicker protruding section 1221 can play a certain role in contracting the diaphragm to prevent foreign matter from entering the battery cell 20 from the top, thereby improving the safe use performance of the battery.

[0038] Combination Figure 6 As shown, the first direction can be represented as X, the second direction can be represented as Y, and the third direction can be represented as Z. The first direction is perpendicular to the large surface of the cover plate assembly 11. The large surface of the cover plate assembly 11 can be considered as the surface with the largest area of ​​the cover plate assembly 11. Further, the large surface of the cover plate assembly 11 is the surface of the cover plate assembly 11 opposite to the opening 121. The second direction is the wall thickness direction of the protruding section 1221, and the third direction can be perpendicular to the first direction, and the third direction can be perpendicular to the second direction.

[0039] Combination Fig.14 As shown, the wall thickness of the protruding section 1221 can be represented by x1, and the wall thickness of the main section 1222 can be represented by x2, and x1 is greater than x2.

[0040] In one embodiment, along the first direction, the ratio of the overlapping height dimension of the first orthographic projection and the second orthographic projection to the height dimension of the battery cell body 21 is 0.004-0.1, which can not only ensure that the protruding section 1221 effectively fixes the battery cell body 21, but also avoid the overlapping height of the protruding section 1221 and the battery cell body 21 being too large, which will effectively cause the expansion of the battery cell 20 and may also affect the injection of electrolyte.

[0041] Along the first direction, the height dimension of the first orthographic projection and the second orthographic projection overlapping is the height dimension directly opposite to the protruding section 1221 and the battery cell body 21. The ratio of the height dimension of the first orthographic projection and the second orthographic projection overlapping to the height dimension of the battery cell body 21 is too small, and the overlapping dimension of the protruding section 1221 and the diaphragm of the battery cell body 21 is too small, which cannot play the role of binding the diaphragm and the pole ear 22. The ratio of the height dimension of the first orthographic projection and the second orthographic projection overlapping to the height dimension of the battery cell body 21 is too large, which will make the side of the battery cell 20 close to the cover assembly 11 too tight, thereby affecting the injection of electrolyte, which is not conducive to improving the manufacturing efficiency of the battery.

[0042] Along the first direction, the ratio of the height dimension of the first orthographic projection and the second orthographic projection overlapping to the height dimension of the battery cell body 21 can be 0.004, 0.005, 0.006, 0.007, 0.008, 0.009, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09 or 0.1, etc.

[0043] In one embodiment, along the first direction, the height dimension of the overlap between the first orthographic projection and the second orthographic projection is 0.1 mm to 10 mm. On the basis of allowing the protruding section 1221 to fix and clamp the battery cell body 21, it can also avoid that the overlap area between the two is too large, thereby affecting the operation of the battery cell 20 and the injection of electrolyte.

[0044] The height dimension of the overlap between the first orthographic projection and the second orthographic projection can be 0.1mm, 0.2mm, 0.3mm, 0.5mm, 0.6mm, 0.8mm, 0.9mm, 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.5mm, 2.8mm, 3mm, 3.2mm, 3.5mm, 3.8mm, 4mm, 4.2mm, 4.5mm, 4.8mm, 5mm, 5.2mm, 5.5mm, 5.8mm, 6mm, 6.2mm, 6.5mm, 6.8mm, 7mm, 7.2mm, 7.5mm, 7.8mm, 8mm, 8.2mm, 8.5mm, 8.8mm, 9mm, 9.2mm, 9.5mm, 9.8mm or 10mm, etc.

[0045] The height dimension of the overlap between the first orthographic projection and the second orthographic projection is 0.1mm to 10mm. When the height dimension of the overlap between the first orthographic projection and the second orthographic projection is relatively large, the protruding section 1221 can overlap not only with the diaphragm, but also with the pole piece, thereby playing a reliable fixing role.

[0046] In one embodiment, Fig.12 and Fig.13As shown, the battery cell body 21 includes a positive electrode sheet 211, a negative electrode sheet 212 and a diaphragm 213. The diaphragm 213 is located between the positive electrode sheet 211 and the negative electrode sheet 212. Along the first direction, one end of the diaphragm 213 close to the opening 121 is arranged beyond the positive electrode sheet 211 and the negative electrode sheet 212, so that the diaphragm 213 can form an insulating protection for the positive electrode sheet 211 and the negative electrode sheet 212, and can also form a constraint on the electrode ear 22, thereby improving the safe use performance of the battery cell 20.

[0047] Among them, along the first direction, the minimum height dimension of the diaphragm 213 exceeding the positive pole piece 211 and the negative pole piece 212 is greater than the height dimension of the first orthographic projection and the second orthographic projection overlapping, that is, at least part of the first orthographic projection overlaps with the second orthographic projection formed by the diaphragm 213, and the first orthographic projection and the second orthographic projection formed by the positive pole piece 211 do not overlap, and the first orthographic projection and the second orthographic projection formed by the negative pole piece 212 do not overlap. On the basis of ensuring that the protruding section 1221 fixes the battery cell 20, it is also possible to avoid the protruding section 1221 from squeezing the positive pole piece 211 and the negative pole piece 212, thereby reducing the possibility of the positive pole piece 211 and the negative pole piece 212 being crushed, thereby improving the safe use performance of the battery cell 20.

[0048] One end of the diaphragm 213 close to the opening 121 can be set beyond the positive electrode sheet 211 and the negative electrode sheet 212; or, one end of the diaphragm 213 close to the opening 121 can be set beyond the positive electrode sheet 211 and the negative electrode sheet 212, and the other end of the diaphragm 213 away from the opening 121 can also be set beyond the positive electrode sheet 211 and the negative electrode sheet 212.

[0049] It should be noted that the battery includes a cell 20 and an electrolyte, which is the smallest unit capable of performing electrochemical reactions such as charging / discharging. The cell 20 refers to a unit formed by winding or laminating a stacked portion, which includes a first pole piece, a separator, and a second pole piece. When the first pole piece is a positive pole piece 211, the second pole piece is a negative pole piece 212, and the separator can be a diaphragm 213. The polarities of the first pole piece and the second pole piece can be interchanged. The first pole piece and the second pole piece are coated with active materials.

[0050] 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 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.

[0051] 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 separator arranged between the first pole sheet and the second pole sheet are wound to obtain a wound battery cell.

[0052] In one embodiment, along the second direction, the minimum distance between the protruding section 1221 and the battery cell body 21 is 0-2 mm, thereby ensuring that the protruding section 1221 fixes the battery cell body 21 and ensuring the space utilization of the shell structure 10, thereby controlling the energy density of the battery.

[0053] Along the second direction, the minimum distance between the protruding section 1221 and the battery cell body 21 can be 0, 0.1 mm, 0.2 mm, 0.3 mm, 0.5 mm, 0.6 mm, 0.8 mm, 0.9 mm, 1 mm, 1.2 mm, 1.5 mm, 1.8 mm or 2 mm, etc.

[0054] In one embodiment, the ratio of the wall thickness of the protruding section 1221 to the wall thickness of the body section 1222 is 1.2 to 2, which can not only ensure that the protruding section 1221 can fix the battery cell 20, but also avoid the first side plate 122 having a large thickness difference, which is not conducive to ensuring the overall structural strength, thereby improving the safety performance of the battery. At the same time, due to the difference in wall thickness between the protruding section 1221 and the body section 1222, it can also be beneficial to the assembly of the battery cell 20 and reduce the difficulty of installing the battery cell 20 into the housing 12.

[0055] The ratio of the wall thickness of the protruding section 1221 to the wall thickness of the main body section 1222 can be 1.2, 1.25, 1.3, 1.35, 1.4, 1.45, 1.5, 1.55, 1.6, 1.65, 1.7, 1.75, 1.8, 1.85, 1.9, 1.95 or 2, etc.

[0056] In one embodiment, along the second direction, the ratio of the dimension a of the protruding section 1221 relative to the main section 1222 to the thickness b of the battery cell body 21 is 0.01 to 0.1, which can not only ensure that the protruding section 1221 can fix the battery cell body 21, but also avoid the protruding dimension a of the protruding section 1221 relative to the main section 1222 being too large, thereby occupying a larger internal space of the shell 12. On the basis of ensuring the battery energy density, the battery capacity can also be guaranteed.

[0057] Combination Figure 2 As shown, the protruding dimension of the protruding section 1221 relative to the main section 1222 can be expressed as a, and the thickness dimension of the battery cell body 21 can be expressed as b. The thickness b of the battery cell body 21 is the dimension of the battery cell body 21 along the second direction.

[0058] The ratio of the dimension a of the protruding section 1221 relative to the main section 1222 to the thickness b of the battery cell body 21 may be 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09 or 0.1, etc.

[0059] If the ratio of the protruding dimension a of the protruding section 1221 relative to the main section 1222 to the thickness b of the battery body 21 is too large, the protruding section 1221 will occupy too much internal space of the housing 12, which is not conducive to ensuring the energy density of the battery and the capacity of the battery cannot be controlled. If the ratio of the protruding dimension a of the protruding section 1221 relative to the main section 1222 to the thickness b of the battery body 21 is too small, the fixing performance of the protruding section 1221 to the battery 20 is quite poor, which is not conducive to improving the safe use performance of the battery.

[0060] In one embodiment, the ratio of the dimension a of the protruding section 1221 relative to the main section 1222 to the length c of the battery cell body 21 is 0.0015 to 0.005, and the length c of the battery cell body 21 is the dimension along the third direction, which is perpendicular to the first direction and the second direction. While ensuring that the protruding section 1221 can effectively fix and limit the battery cell body 21, the capacity and energy density of the battery can also be guaranteed, thereby controlling the battery performance.

[0061] Combination Fig.11 As shown, the length of the battery cell body 21 can be expressed as c. If the ratio of the dimension a of the protruding section 1221 relative to the body section 1222 to the length c of the battery cell body 21 is large, the protruding section 1221 will occupy too much internal space of the shell 12, which is not conducive to ensuring the energy density of the battery and cannot control the capacity of the battery. If the ratio of the dimension a of the protruding section 1221 relative to the body section 1222 to the length c of the battery cell body 21 is small, the contact dimension between the protruding section 1221 and the battery cell body 21 is relatively small, and the fixing performance of the protruding section 1221 to the battery cell 20 is quite poor, which is not conducive to improving the safe use performance of the battery.

[0062] The ratio of the dimension a of the protruding section 1221 relative to the main section 1222 to the length c of the battery cell body 21 can be 0.0015, 0.0016, 0.0018, 0.002, 0.0025, 0.0026, 0.0028, 0.002, 0.0035, 0.0036, 0.0038, 0.004, 0.0045, 0.0046, 0.0048 or 0.005, etc.

[0063] In one embodiment, along the third direction, the length of the battery cell body 21 is c, the length of the protruding section 1221 is d, 0.1c≤d≤c, and the third direction is perpendicular to the first direction and perpendicular to the second direction. This ensures that the battery cell 20 can effectively utilize the space in the shell structure 10, ensures the energy density of the battery, and ensures that the protruding section 1221 effectively fixes the battery cell body 21, thereby ensuring the safe use performance of the battery.

[0064] In one embodiment, the protruding section 1221 and the side of the main body section 1222 facing away from the battery cell 20 are located on the same plane, that is, the protruding section 1221 and the side of the main body section 1222 facing away from the battery cell 20 are flush, which not only ensures the flatness of the shell structure 10, but also facilitates the molding of the shell part 12, thereby improving the manufacturing efficiency of the battery.

[0065] It should be noted that the protruding section 1221 and the side of the main body section 1222 facing away from the battery cell 20 are located on the same plane, and the emphasis here is on protrusion. There is no protruding structure on the side of the protruding section 1221 and the main body section 1222 facing away from the battery cell 20. It is a relatively smooth structure. Without considering deformation, manufacturing errors and the like, the surface of the protruding section 1221 facing away from the battery cell 20 and the surface of the main body section 1222 facing away from the battery cell 20 are located on the same plane.

[0066] In one embodiment, Figure 5 and Fig. 9 As shown, the first side plate 122 also includes a first transition plate 1223, which connects the protruding section 1221 and the main section 1222; wherein, the first transition plate 1223 is a first variable thickness structure, and the wall thickness of the first transition plate 1223 gradually decreases from the protruding section 1221 toward the main section 1222, which not only facilitates the molding of the first transition plate 1223, but also avoids the direct connection between the protruding section 1221 and the main section 1222, which is not conducive to ensuring the structural strength of the first side plate 122 and there is a risk of breakage.

[0067] The first transition plate 1223 connects the protruding section 1221 and the main body section 1222, that is, the protruding section 1221, the first transition plate 1223 and the main body section 1222 can be arranged along a first direction, and in the direction from the protruding section 1221 to the main body section 1222, the wall thickness of the first transition plate 1223 gradually decreases, which can ensure that the relatively thick protruding section 1221 can be smoothly transitioned to the relatively thin main body section 1222 through the first transition plate 1223 with changed size, thereby facilitating the molding of the shell part 12, and can be beneficial to the release of stress, thereby reducing the risk of breakage of the first side plate 122.

[0068] The protruding section 1221 , the first transition plate 1223 , and the side of the body section 1222 facing away from the battery cell 20 may be located on the same plane.

[0069] The surface of the first transition plate 1223 facing the battery cell 20 may be a flat surface, or the surface of the first transition plate 1223 facing the battery cell 20 may be a curved surface.

[0070] In one embodiment, along the first direction, the edge area of ​​the battery cell body 21 includes a thinned area, and along the second direction, the first transition plate 1223 and the thinned area have their orthographic projections on the same plane at least partially overlap, so that the first transition plate 1223 can also form a limit fixation for the battery cell body 21, thereby further improving the fixing ability of the battery cell 20, thereby improving the safe use performance of the battery.

[0071] Combination Fig.13 As shown, the edge area of ​​the positive electrode sheet 211 of the battery cell body 21 can be thinned, and the edge area of ​​the negative electrode sheet 212 of the battery cell body 21 can be thinned, that is, the positive electrode active material in the edge area of ​​the positive electrode sheet 211 can be thinned, and the negative electrode active material in the edge area of ​​the negative electrode sheet 212 can be thinned. Therefore, after the battery cell 20 is formed, the edge area of ​​the battery cell body 21 includes a thinned area, and the orthographic projections of the first transition plate 1223 and the thinned area on the same plane are at least partially overlapped, that is, the first transition plate 1223 and the thinned area of ​​the battery cell body 21 have an overlapping part, thereby further improving the limiting and fixing ability of the battery cell 20.

[0072] The edge region of the battery cell body 21 includes a thinned region, that is, it can be considered that the thickness of the thinned region of the battery cell body 21 is smaller than the thickness of the middle region of the battery cell body 21 .

[0073] In one embodiment, in the direction from the protruding section 1221 to the main body section 1222, the wall thickness of the first transition plate 1223 changes from small to large at first, which not only ensures that the protruding section 1221 smoothly transitions to the main body section 1222 through the first transition plate 1223, but also reduces the risk of the first side plate 122 crushing the battery cell 20, thereby ensuring the safe use performance of the battery.

[0074] The wall thickness of the first transition plate 1223 changes first from small to large, that is, the wall thickness change rate of a part of the first transition plate 1223 close to the protruding section 1221 is smaller than that of another part of the first transition plate 1223 close to the main body section 1222. For example, in the direction from the protruding section 1221 to the main body section 1222, the wall thickness change rate of a part of the first transition plate 1223 close to the protruding section 1221 is 0.01 mm, and the wall thickness change rate of another part of the first transition plate 1223 close to the main body section 1222 may be 0.02 mm, thereby reducing the influence of the corner of the protruding section 1221 on the battery cell 20 and preventing damage to the battery cell 20 when the battery cell expands.

[0075] In one embodiment, Fig.10 As shown, the first side plate 122 also includes a second transition plate 1224, and there are two second transition plates 1224. Along the third direction, the two second transition plates 1224 are respectively connected to the opposite ends of the protruding section 1221, and the third direction is perpendicular to the first direction and to the second direction; wherein, the second transition plate 1224 is a second variable thickness structure, and the wall thickness of the second transition plate 1224 gradually decreases from one end connected to the protruding section 1221 toward the other end away from the protruding section 1221, which not only facilitates the molding of the first side plate 122 and improves the manufacturing efficiency of the battery, but also avoids the first side plate 122 from transitioning too large in size, thereby affecting the structural strength of the first side plate 122.

[0076] The opposite ends of the first side plate 122 can be connected to the arc side plate 124, and the thickness of the protruding section 1221 can be relatively large. Therefore, by making the second transition plate 1224 a second variable thickness structure, the wall thickness of the second transition plate 1224 gradually decreases from one end connected to the protruding section 1221 toward the other end away from the protruding section 1221, thereby ensuring that the protruding section 1221 can smoothly transition to the arc side plate 124 through the second transition plate 1224, thereby controlling the forming ability of the shell part 12, and also ensuring the structural stability of the shell part 12, reducing the risk of breakage of the shell part 12.

[0077] In one embodiment, Figures 6 to 8 As shown, the shell member 12 also includes a second side plate 123 connected to the cover plate assembly 11, the first side plates 122 are two opposite to each other, and the two opposite first side plates 122 are arranged along the second direction, the second side plates 123 are two opposite to each other, and the two opposite second side plates 123 are arranged along the third direction, the second side plate 123 connects the two opposite first side plates 122, and the third direction is perpendicular to the first direction and perpendicular to the second direction; wherein, the area of ​​the first side plate 122 is greater than the area of ​​the second side plate 123, so that the first side plate 122 with a relatively large area can effectively fix the battery cell body 21, increase the fixing area of ​​the protruding section 1221 of the first side plate 122 and the battery cell body 21, thereby improving the stability performance of the battery cell 20, thereby improving the safe use performance of the battery.

[0078] The housing 12 comprises two opposite first side plates 122 and two opposite second side plates 123. The housing 12 is substantially rectangular. The area of ​​the first side plate 122 is larger than that of the second side plate 123, that is, the large surface area of ​​the first side plate 122 is larger than that of the second side plate 123.

[0079] In one embodiment, Figures 6 to 8As shown, the housing 12 further includes a second side plate 123 connected to the cover plate assembly 11, the first side plates 122 are two opposite first side plates 122, the two opposite first side plates 122 are arranged along the second direction, the second side plates 123 are two opposite second side plates 123, the two opposite second side plates 123 are arranged along the third direction, the second side plate 123 connects the two opposite first side plates 122, the third direction is perpendicular to the first direction, and perpendicular to the second direction; wherein the second side plate 123 includes a thin plate segment 1231 and a thick plate segment 1232, the thin plate segment 1231 Located on the side of the thick plate section 1232 close to the opening 121, the thin plate section 1231 and the thick plate section 1232 are arranged along the first direction, the wall thickness of the thin plate section 1231 is smaller than the wall thickness of the thick plate section 1232, and at least part of the cover plate assembly 11 is located on the inner side of the thin plate section 1231 and abuts against the thick plate section 1232, so that the cover plate assembly 11 can be positioned by the thick plate section 1232, thereby improving the installation efficiency of the cover plate assembly 11, and also ensuring the installation accuracy of the cover plate assembly 11, thereby improving the manufacturing efficiency of the battery.

[0080] The second side plate 123 includes a thin plate section 1231 and a thick plate section 1232. The thin plate section 1231 is located on the side of the thick plate section 1232 close to the opening 121. The thin plate section 1231 and the thick plate section 1232 are arranged along the first direction. The wall thickness of the thin plate section 1231 is less than that of the thick plate section 1232, so that the battery cell 20 can be easily installed in the housing 12, thereby improving the manufacturing efficiency of the battery. At least part of the cover plate assembly 11 is located on the inner side of the thin plate section 1231 and abuts against the thick plate section 1232, which can effectively limit the cover plate assembly 11, facilitate the installation of the cover plate assembly 11, and thus improve the installation efficiency of the battery.

[0081] In one embodiment, Figure 3 As shown, the cover assembly 11 may include a cover 111, which may be fixedly connected to the shell member 12. A first protrusion structure may be provided on the cover 111, so that the first protrusion structure abuts against the thick plate section 1232, thereby forming a limited fixation of the cover assembly 11.

[0082] In one embodiment, Figure 4 As shown, the cover plate assembly 11 may include a cover plate 111 and an insulating plate 113. The insulating plate 113 may be located between the cover plate 111 and the battery cell 20. A second protruding structure may be provided on the insulating plate 113, so that the second protruding structure abuts against the thick plate section 1232, thereby forming a limited fixation of the cover plate assembly 11.

[0083] In one embodiment, two opposing protruding sections 1221 and two opposing thin plate sections 1231 surround at least a portion of the opening 121, that is, when the battery cell 20 is loaded into the shell member 12 through the opening 121, the battery cell 20 will first contact the protruding sections 1221 and the thin plate sections 1231. The relatively thin thin plate sections 1231 can facilitate the loading of the battery cell 20, and the relatively thick protruding sections 1221 can subsequently form a limit fixation for the battery cell 20.

[0084] In one embodiment, the wall thickness of the thin plate section 1231 is smaller than the wall thickness of the main body section 1222, which can facilitate the assembly of the battery cell 20 and improve the efficiency of installing the battery cell 20 to the shell member 12. It can also enable the main body section 1222 to have a certain structural strength and reduce the risk of damage, thereby improving the safe use performance of the battery. It can also ensure the uniformity of the connection strength between the first side plate 122 and the second side plate 123 of the shell member 12 and the cover plate assembly 11 to avoid connection failure.

[0085] In one embodiment, along the first direction, the height of the protruding section 1221 is greater than the height of the thin plate section 1231, which ensures that the protruding section 1221 can have a relatively large height, ensures the contact height with the battery cell body 21, improves the fixing performance of the battery cell 20, and can also avoid the height of the thin plate section 1231 being too large, which is not conducive to ensuring the structural strength of the shell 12.

[0086] In one embodiment, Figures 6 to 8 As shown, the shell member 12 also includes an arc side panel 124 connected to the cover plate assembly 11. There are four arc side panels 124, and the arc side panels 124 connect the first side panel 122 and the second side panel 123. The arrangement of the arc side panels 124 can reduce stress concentration in the corner area of ​​the shell member 12, thereby helping to ensure the structural strength of the shell member 12 and avoid damage to the shell member 12, which would affect the safe use performance of the battery.

[0087] The arc side plate 124 can be considered as an arc-shaped plate body, that is, the first side plate 122 and the second side plate 123 are connected by the arc-shaped plate body.

[0088] In one embodiment, Figure 8 As shown, the arc side plate 124 includes a first arc plate 1241 and a second arc plate 1242, the first arc plate 1241 is located on a side of the second arc plate 1242 close to the opening 121, the first arc plate 1241 and the second arc plate 1242 are arranged along a first direction, the first arc plate 1241 connects the protruding section 1221 and the thin plate section 1231, and at least a portion of the second arc plate 1242 connects the protruding section 1221 and the thick plate section 1232;

[0089] Among them, the wall thickness of the first arc plate 1241 gradually decreases from the protruding section 1221 to the thin plate section 1231, so that the protruding section 1221 can smoothly transition to the thin plate section 1231 through the first arc plate 1241, avoiding the risk of the shell 12 being easily broken due to a large wall thickness ratio.

[0090] And / or, the wall thickness of the second arc plate 1242 gradually increases from the protruding section 1221 toward the thick plate section 1232, so that the protruding section 1221 can smoothly transition to the thick plate section 1232 through the second arc plate 1242, avoiding the risk of the shell 12 being easily broken due to a large wall thickness ratio.

[0091] The wall thickness of the protruding section 1221 may be smaller than the wall thickness of the thick plate section 1232 .

[0092] In one embodiment, the second arc plate 1242 also connects the main body section 1222 and the thick plate section 1232, thereby ensuring that the main body section 1222 smoothly transitions to the thick plate section 1232 through the second arc plate 1242, thereby ensuring the structural strength of the shell member 12 and reducing the risk of the shell member 12 breaking.

[0093] In one embodiment, Figure 7 As shown, the shell member 12 also includes a bottom plate 125 arranged opposite to the cover plate assembly 11, and the first side plate 122 and the second side plate 123 are both connected to the bottom plate 125; wherein, the shell member 12 is an integrally formed structure, which can not only ensure the structural strength of the shell member 12, but also effectively control the forming efficiency of the shell member 12, improve the manufacturing efficiency of the shell structure 10, and further help to ensure the manufacturing efficiency of the battery.

[0094] In one embodiment, the shell 12 is an integrally formed structure, that is, the first side plate 122, the second side plate 123 and the bottom plate 125 are an integrally formed structure. For example, the shell 12 may be a structure formed by stretching.

[0095] In one embodiment, the cover plate assembly 11 and the shell member 12 are welded and connected. The cover plate assembly 11 and the shell member 12 are penetrated and welded, which can not only ensure the connection strength between the cover plate assembly 11 and the shell member 12, but also facilitate the welding of the cover plate assembly 11 and the shell member 12. The relatively thick protruding section 1221 can also ensure the welding area of ​​the cover plate assembly 11 and the shell member 12, reduce the probability of welding energy hitting the battery cell 20, and improve the quality of the battery to a certain extent, thereby ensuring the safety performance of the battery.

[0096] The cover assembly 11 and the shell member 12 are connected by penetration welding. The weld mark can be located on the cover assembly 11. Further, the weld mark can be located on the side of the cover assembly 11 away from the protruding section 1221. During the welding process, the welding head can be located on the side of the cover assembly 11 away from the protruding section 1221 for welding.

[0097] The cover plate assembly 11 includes a cover plate 111, which can be welded to the shell member 12. For example, the cover plate 111 and the shell member 12 can be metal parts, for example, the cover plate 111 and the shell member 12 can be steel, or the cover plate 111 and the shell member 12 can be aluminum, etc.

[0098] In one embodiment, the cover plate assembly 11 includes a cover plate 111 and a pole 112 . The pole 112 is disposed on the cover plate 111 , and the pole 112 can be electrically connected to the pole lug 22 .

[0099] 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.

[0100] It should be noted that when determining the overlap dimension of the protruding section 1221 and the battery cell body 21, that is, determining the overlap height dimension of the first orthographic projection and the second orthographic projection, the following method may be used:

[0101] 1. Scan the complete battery using CT (computer tomography) equipment. For example, scan the battery along the third direction to obtain the minimum distance between the top of the pole piece of the battery body 21 and the bottom of the protruding section 1221. Fig.14 In the embodiment shown, the minimum distance h1 between the top of the negative electrode piece 212 of the battery body 21 and the bottom of the protruding section 1221 can be obtained. The electrode piece of the battery body 21 includes a metal sheet and an active material layer, so the boundary can be clearly seen in the CT device. The diaphragm 213 is an inorganic material and the boundary cannot be clearly displayed. Therefore, the minimum distance between the top of the electrode piece of the battery body 21 and the bottom of the protruding section 1221 is first obtained using the CT device.

[0102] 2. Take the battery cell 20 out of the shell structure 10, remove the insulating layer covering the battery cell body 21, and if the outer surface is covered with a diaphragm 213, the diaphragm 213 can also be unfolded to expose the pole piece. The minimum distance between the top of the diaphragm 213 and the top of the pole piece can be measured with a ruler. Fig.14 In the illustrated embodiment, a minimum distance h2 between the top of the negative electrode sheet 212 of the battery cell body 21 and the top of the separator 213 can be obtained.

[0103] 3. The height dimension of the overlap between the first orthographic projection and the second orthographic projection is h=h2-h1.

[0104] It should be noted that the CT equipment can adopt Phoenix v|tome|xm 300kV / 500W all-purpose X-ray microfocus CT (Computed Tomography) system. The pole tab 22 is not part of the battery body 21. When using the CT equipment for measurement, the pole piece and the pole tab 22 can be clearly divided. For example, the negative electrode plate 212 includes a metal foil and a negative electrode active material layer. The metal foil can be copper, and the negative electrode active material layer can be graphite, hard carbon, soft carbon, mesophase carbon microspheres, silicon carbon and lithium titanate, etc. The image obtained by the CT system can clearly find the top of the negative electrode plate 212.

[0105] The above measurement method is only one way. In specific operations, other methods can be used for measurement, which is not limited here.

[0106] In one embodiment, the battery may be a cylindrical battery, or the battery may be a hexagonal prism-type battery.

[0107] An embodiment of the utility model further provides a battery pack, comprising the above-mentioned battery.

[0108] A battery of a battery pack of an embodiment of the utility model includes a shell structure 10 and a battery cell 20, and the battery cell 20 is arranged in the shell structure 10, so that the shell structure 10 forms protection for the battery cell 20. The cover plate assembly 11 of the shell structure 10 forms a closure for the opening 121 of the shell member 12, and the first side plate 122 of the shell member 12 includes a protruding section 1221 and a main body section 1222, and the battery cell 20 includes a battery cell body 21 and a pole ear 22, the minimum wall thickness of the protruding section 1221 is greater than the maximum wall thickness of the main body section 1222, and the difference between the maximum wall thickness of the protruding section 1221 and the minimum wall thickness of the protruding section 1221 is less than or equal to 0.04mm, by making the protruding section 1221 protrude relative to the main body section 1222 along a side facing the battery cell 20, and the protruding section 1221 and the battery cell body 21 have a first orthographic projection and a second orthographic projection respectively on the same plane, at least part of the first orthographic projection and The second orthographic projection overlaps, so that the battery cell body 21 can overlap with the relatively thick and relatively uniformly thick protruding section 1221. After the battery cell 20 is loaded into the shell member 12, the thicker protruding section 1221 can fix the battery cell body 21 to prevent the battery cell 20 from shaking. At the same time, since the thicker protruding section 1221 clamps the battery cell 20, the risk of the battery cell body 21 becoming loose can be prevented, and the movement of the pole ear 22 in the shell structure 10 can also be reduced, thereby reducing the risk of short circuit. Moreover, since the protruding section 1221 has a gathering effect on the battery cell body 21, it can also prevent foreign matter from entering the battery cell 20 from the top, thereby further improving the safe use performance of the battery pack.

[0109] In one embodiment, the battery pack is a battery module or a battery pack.

[0110] 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.

[0111] 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.

[0112] 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.

[0113] 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 shell structure (10), the shell structure (10) comprising a cover plate assembly (11) and a shell member (12), the shell member (12) comprising an opening (121), the cover plate assembly (11) being arranged on the shell member (12) to close the opening (121), the shell member (12) comprising a first side plate (122) connected to the cover plate assembly (11), the first side plate (122) comprising a body section (1222) and a protruding section (1221) arranged at the opening (121), the protruding section (1221) and the body section (1222) being arranged along a first direction, the first direction being perpendicular to a large surface of the cover plate assembly (11), the minimum wall thickness of the protruding section (1221) being greater than the maximum wall thickness of the body section (1222), and the difference between the maximum wall thickness of the protruding section (1221) and the minimum wall thickness of the protruding section (1221) being less than or equal to 0.04 mm; A battery cell (20), wherein the battery cell (20) is arranged in the shell structure (10), the battery cell (20) comprises a battery cell body (21) and a pole ear (22), the pole ear (22) extends from the battery cell body (21), the protruding section (1221) is protruding toward one side of the battery cell (20) compared to the main section (1222), and along a second direction, the protruding section (1221) and the battery cell body (21) respectively have a first orthographic projection and a second orthographic projection on the same plane, at least a part of the first orthographic projection coincides with the second orthographic projection, and the second direction is the wall thickness direction of the protruding section (1221).

2. The battery according to claim 1, characterized in that Along the first direction, the ratio of the height dimension of the first orthographic projection and the second orthographic projection overlapped to the height dimension of the battery cell body (21) is 0.004-0.

1.

3. The battery according to claim 2, characterized in that Along the first direction, the height dimension of the overlap between the first orthographic projection and the second orthographic projection is 0.1 mm to 10 mm.

4. The battery according to claim 2, characterized in that The battery cell body (21) comprises a positive electrode sheet (211), a negative electrode sheet (212) and a diaphragm (213); the diaphragm (213) is located between the positive electrode sheet (211) and the negative electrode sheet (212); along the first direction, one end of the diaphragm (213) close to the opening (121) is arranged beyond the positive electrode sheet (211) and the negative electrode sheet (212); Wherein, along the first direction, the minimum height dimension of the diaphragm (213) beyond the positive electrode plate (211) and the negative electrode plate (212) is greater than the height dimension of the first orthographic projection and the second orthographic projection overlapping.

5. The battery according to claim 1, characterized in that Along the second direction, the minimum distance between the protruding section (1221) and the battery cell body (21) is 0 to 2 mm.

6. The battery according to claim 1, characterized in that The ratio of the wall thickness of the protruding section (1221) to the wall thickness of the main body section (1222) is 1.2 to 2.

7. The battery according to claim 1, characterized in that Along the second direction, the ratio of a dimension a of the protruding section (1221) relative to the main section (1222) to a thickness b of the battery cell main body (21) is 0.01 to 0.

1.

8. The battery according to claim 1, characterized in that The ratio of the dimension a of the protruding section (1221) relative to the main section (1222) to the length c of the battery cell body (21) is 0.0015 to 0.005, and the length c of the battery cell body (21) is the dimension along a third direction, and the third direction is perpendicular to the first direction and perpendicular to the second direction.

9. The battery according to claim 1, characterized in that Along the third direction, the length of the battery cell body (21) is c, the length of the protruding section (1221) is d, 0.1c≤d≤c, and the third direction is perpendicular to the first direction and perpendicular to the second direction.

10. The battery according to claim 1, characterized in that The protruding section (1221) and the side of the main body section (1222) facing away from the battery core (20) are located on the same plane.

11. The battery according to any one of claims 1 to 10, characterized in that The first side plate (122) further comprises a first transition plate (1223), wherein the first transition plate (1223) connects the protruding section (1221) and the main body section (1222); The first transition plate (1223) is a first variable thickness structure, and the wall thickness of the first transition plate (1223) gradually decreases in the direction from the protruding section (1221) toward the main section (1222); Wherein, along the first direction, the edge area of ​​the battery cell body (21) includes a thinned area, and along the second direction, the orthographic projections of the first transition plate (1223) and the thinned area on the same plane at least partially overlap.

12. The battery according to any one of claims 1 to 10, characterized in that The first side plate (122) further comprises a first transition plate (1223), wherein the first transition plate (1223) connects the protruding section (1221) and the main body section (1222); The first transition plate (1223) is a first variable thickness structure, and the wall thickness of the first transition plate (1223) gradually decreases in the direction from the protruding section (1221) toward the main section (1222); Wherein, in the direction from the protruding section (1221) toward the main body section (1222), the wall thickness of the first transition plate (1223) changes from small to large at first.

13. The battery according to any one of claims 1 to 10, characterized in that The housing (12) further comprises a second side plate (123) connected to the cover plate assembly (11); the first side plates (122) are two opposite first side plates (122), the two opposite first side plates (122) are arranged along the second direction; the second side plates (123) are two opposite second side plates (123), the two opposite second side plates (123) are arranged along a third direction; the second side plate (123) connects the two opposite first side plates (122), the third direction is perpendicular to the first direction and perpendicular to the second direction; Wherein, the second side plate (123) comprises a thin plate section (1231) and a thick plate section (1232), the thin plate section (1231) is located on a side of the thick plate section (1232) close to the opening (121), the thin plate section (1231) and the thick plate section (1232) are arranged along the first direction, the wall thickness of the thin plate section (1231) is smaller than the wall thickness of the thick plate section (1232), and at least a part of the cover plate assembly (11) is located on the inner side of the thin plate section (1231) and abuts against the thick plate section (1232).

14. The battery according to claim 13, characterized in that The wall thickness of the thin plate section (1231) is smaller than the wall thickness of the main body section (1222).

15. The battery according to claim 13, characterized in that Along the first direction, the height of the protruding section (1221) is greater than the height of the thin plate section (1231).

16. The battery according to claim 13, characterized in that The housing (12) further comprises arc side plates (124) connected to the cover plate assembly (11), the arc side plates (124) being four in number, and the arc side plates (124) connecting the first side plate (122) and the second side plate (123); The arc side plate (124) comprises a first arc plate (1241) and a second arc plate (1242); the first arc plate (1241) is located on a side of the second arc plate (1242) close to the opening (121); the first arc plate (1241) and the second arc plate (1242) are arranged along the first direction; the first arc plate (1241) connects the protruding section (1221) and the thin plate section (1231); and at least a portion of the second arc plate (1242) connects the protruding section (1221) and the thick plate section (1232); Wherein, in the direction from the protruding section (1221) toward the thin plate section (1231), the wall thickness of the first arc plate (1241) gradually decreases, and / or, in the direction from the protruding section (1221) toward the thick plate section (1232), the wall thickness of the second arc plate (1242) gradually increases.

17. The battery according to any one of claims 1 to 10, characterized in that The cover plate assembly (11) and the shell member (12) are connected by welding, and the cover plate assembly (11) and the shell member (12) are connected by penetrating welding; And / or, the housing (12) is an integrally formed structure; And / or, the battery is a quadrangular prism battery.

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