Battery cell, battery, shell assembly and electric equipment

Abstract

The invention discloses a battery cell, a battery, a shell assembly and electric equipment, the battery cell comprises a battery cell body, the battery cell body is provided with a first side wall in the thickness direction, and n through holes are formed in the first side wall; wherein the area of the first side wall is S0, the cross-sectional area of the through hole is S, n * S < = (1-p) * S0, 80% < = p < = 99.8%, and n is a positive integer greater than or equal to 1. According to the battery cell provided by the invention, the through hole is formed in the first side wall of the battery cell body, so that the volume expansion of the battery cell can be inhibited, the performance and the service life of the battery cell can be obviously improved, and the energy density of the battery cell can be guaranteed by limiting a parameter p between 80% and 99.8%.

Description

Technical Field

[0001] The present invention relates to the field of batteries, and in particular to a battery cell, a battery, a shell assembly and an electrical device. Background Art

[0002] With the continuous advancement of science and technology, the performance and life of batteries, as the core components of energy storage and output, are crucial to the operation of the entire system. Among various battery systems, lithium metal batteries and silicon negative electrode batteries have attracted widespread attention due to their advantages such as high energy density and long life.

[0003] Electrochemical systems with high volume expansion often face problems such as uneven stress on the cells, rapid life decay, and battery bulging due to changes in the cell volume during the cycle process. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a battery cell. According to the battery cell of the present invention, by providing a through hole on the first side wall of the battery cell body, the volume expansion of the battery cell can be suppressed, the performance and life of the battery cell will be significantly improved, and by limiting the parameter p between 80% and 99.8%, the energy density of the battery cell can be guaranteed.

[0005] The invention also provides a battery having the battery core.

[0006] The present invention also provides a shell assembly for the battery core.

[0007] The invention also provides an electrical device having the battery.

[0008] The battery cell according to the present invention comprises: a battery cell body, the battery cell body having a first side wall in the thickness direction, and n through holes are arranged on the first side wall; wherein the area of ​​the first side wall is S0, the cross-sectional area of ​​the through hole is S, and satisfies: n*S≤(1-p)*S0, 80%≤p≤99.8%, and n is a positive integer greater than or equal to 1.

[0009] According to the battery cell of the present invention, by providing a through hole on the first side wall of the battery cell body, the stress concentration of the battery cell during the cycle process can be reduced, the uniformity of stress distribution can be improved, and the deformation of the first side wall can be suppressed, thereby reducing the expansion of the battery cell and extending the cycle life and stability of the battery. There can be one through hole on the first side wall, and there can also be multiple through holes on the first side wall. The provision of multiple through holes can more effectively suppress the deformation of the first side wall and further reduce the risk of battery cell expansion. S represents the cross-sectional area of ​​the through hole 1112, which represents the area of ​​the cross section cut by the through hole 1112 in the direction perpendicular to the axis, and also represents the area of ​​the intersection generated by the intersection of the through hole 1112 and the surface of the first side wall 1111. n*S represents the total cross-sectional area of ​​the through hole. The relationship between n*S and the area S0 of the first side wall shows that the total cross-sectional area of ​​the through hole does not exceed the (1-p) part of the area of ​​the first side wall. The parameter p is a value between 80% and 99.8%, which represents the ratio of the effective area (S0-n*S) of the first side wall 1111 to the area S0, and is positively correlated to the integration efficiency of the pack system. The parameter (1-p) represents the ratio of the total cross-sectional area of ​​the through holes to the area of ​​the first side wall. By limiting the parameter p to between 80% and 99.8%, the volume expansion of the battery cell can be effectively suppressed, and the energy density loss caused by the provision of the through holes can be reduced as much as possible, thereby ensuring the energy density of the battery cell. In particular, the area of ​​the first side wall can be larger than the area of ​​other surfaces of the battery cell body, and the first side wall will be more easily deformed during the cycle of the battery cell, causing the battery cell to expand. By providing a through hole on the first side wall, the deformation of the first side wall can be suppressed, thereby more effectively reducing the risk of battery cell expansion.

[0010] According to some embodiments of the present invention, the first side walls are two that are spaced apart from each other and face each other in the thickness direction of the battery cell body, and the through hole is disposed on at least one of the first side walls.

[0011] According to some embodiments of the present invention, the battery cell body is formed by stacking positive electrode sheets and negative electrode sheets; the through hole forms a first through hole on the positive electrode sheet, and the cross-sectional area of ​​the first through hole is S1; the through hole forms a second through hole on the negative electrode sheet, and the cross-sectional area of ​​the second through hole is S2; wherein the first through hole and the second through hole are arranged opposite to each other and satisfy S2≤S1.

[0012] According to some embodiments of the present invention, the cross-sectional area S1 of the first through hole and the cross-sectional area of ​​the second through hole satisfy: 0.8≤S2 / S1≤1.

[0013] According to some embodiments of the present invention, the battery cell body is provided with a diaphragm located between the positive electrode plate and the negative electrode plate, and the through hole is formed with a third through hole on the diaphragm, and the third through hole is respectively arranged opposite to the first through hole and the second through hole, and the cross-sectional area of ​​the third through hole is S3 and satisfies: S3≤S2≤S1.

[0014] According to some embodiments of the present invention, the cross-sectional shape of the through hole is circular or polygonal.

[0015] According to some embodiments of the present invention, the through holes are configured as a plurality of through holes arranged at intervals on the first side wall, and the plurality of through holes are arranged on the first side wall in multiple rows and columns or in a single row or in a single column.

[0016] The battery according to the present invention is briefly described below.

[0017] The battery according to the present invention comprises: a shell having a receiving cavity formed therein for receiving a battery cell; and a battery cell, wherein the battery cell is configured as the battery cell described in any one of the above embodiments and the battery cell is received in the receiving cavity.

[0018] The battery according to the present invention includes the battery cell described in any one of the above embodiments. Since the battery according to the present invention includes the battery cell described in any one of the above embodiments, the battery according to the present invention can reduce the risk of expansion of the battery cell during use, improve the service life and stability, and ensure the energy density of the battery, because the design of the battery cell takes stress distribution and uniformity into consideration.

[0019] According to some embodiments of the present invention, a connecting protrusion located in the accommodating cavity and corresponding to the through hole is provided on the shell, and the connecting protrusion is received in the through hole.

[0020] According to some embodiments of the present invention, the connecting protrusion is detachably connected to the shell.

[0021] According to some embodiments of the present invention, the shell includes: a first shell and a second shell, wherein the first shell and the second shell are connected to define the accommodating cavity between the first shell and the second shell; wherein the first shell is provided with a limiting sleeve extending toward the second shell, and an installation cavity is formed in the limiting sleeve; and the second shell is provided with a limiting column accommodated in the installation cavity, and the limiting column cooperates with the limiting sleeve to be configured as the connecting protrusion.

[0022] According to some embodiments of the present invention, a first clamping portion is provided on the inner wall of the limiting sleeve, and a second clamping portion that is clamped and cooperated with the first clamping portion is formed on the outer periphery of the limiting column, and the first clamping portion and the second clamping portion are suitable for limiting the separation of the limiting sleeve and the limiting column from each other.

[0023] According to some embodiments of the present invention, the battery further comprises: an adhesive layer, wherein the adhesive layer is disposed between the inner wall of the limiting sleeve and the outer surface of the limiting column.

[0024] According to some embodiments of the present invention, the first shell includes a first bottom plate and a first side plate, and the limiting sleeve is arranged on the first bottom plate; the first side plate is arranged on the outer periphery of the first bottom plate; the second shell includes a second bottom plate and a second side plate, and the limiting column is arranged on the second bottom plate; the second side plate is arranged on the outer periphery of the second bottom plate, and the second side plate is connected to the first side plate to form the accommodating cavity between the first bottom plate and the second bottom plate.

[0025] The housing assembly according to the present invention is briefly described below.

[0026] The shell assembly according to the present invention is used for the battery described in any one of the above embodiments, and the shell assembly includes: a shell, a housing cavity suitable for accommodating a battery cell is formed in the shell; a connecting protrusion, the connecting protrusion is arranged on the shell and accommodated in the housing cavity, and the connecting protrusion is suitable for penetrating the through hole. Since the shell assembly according to the present invention is used for the battery described in any one of the above embodiments, the shell assembly according to the present invention can cooperate with the through hole on the battery cell through the connecting protrusion arranged on the shell, so that the battery cell can be more reliably fixed in the housing cavity, thereby improving the reliability and safety of the battery.

[0027] The electrical equipment according to the present invention is briefly described below.

[0028] The electric device according to the present invention includes the battery described in any one of the above embodiments. Since the electric device according to the present invention includes the battery described in any one of the above embodiments, the electric device according to the present invention has high stability and high safety, and can maintain stable performance under different environments and conditions. Since the battery has high safety and long service life, it can meet the needs of long-term use.

[0029] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0031] Figure 1 is a schematic structural diagram of a battery cell according to an embodiment of the present invention;

[0032] Figure 2 is a front schematic diagram of a battery cell according to an embodiment of the present invention;

[0033] Figure 3 is a schematic structural diagram of a battery cell according to another embodiment of the present invention;

[0034] Figure 4 is a front schematic diagram of a battery cell according to another embodiment of the present invention;

[0035] Figure 5 is a schematic structural diagram of a battery cell according to yet another embodiment of the present invention;

[0036] Figure 6 is a front schematic diagram of a battery cell according to yet another embodiment of the present invention;

[0037] Figure 7 is a schematic structural diagram of a first shell of a battery according to an embodiment of the present invention;

[0038] Figure 8 is a schematic structural diagram of a second housing of a battery according to an embodiment of the present invention;

[0039] Fig. 9 is a cross-sectional schematic diagram of a first shell and a second shell of a battery according to an embodiment of the present invention;

[0040] Fig.10 yes Fig. 9 A partial enlarged view of the middle A;

[0041] Fig.11 yes Fig. 9 A partial enlarged view of point B in the middle;

[0042] Fig.12 It is a comparison chart of the battery cycle performance data in Example 1 and Comparative Example 1.

[0043] Reference numerals:

[0044] Battery 1;

[0045] Battery cell 11;

[0046] Battery cell body 111, first side wall 1111, through hole 1112;

[0047] Housing 12;

[0048] The first housing 121, the limiting sleeve 1211, the first clamping portion 1211a, the mounting cavity 1212, the first bottom plate 121a, and the first side plate 121b;

[0049] The second housing 122 , the limiting column 1221 , the second clamping portion 1221 a , the second bottom plate 122 a , and the second side plate 122 b . DETAILED DESCRIPTION

[0050] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0051] In the related art, electrochemical systems with high volume expansion often face problems such as uneven stress on the battery cells, rapid life decay, and battery bulging due to changes in the volume of the battery cells during the cycle process.

[0052] Reference below Figure 1-Figure 6 A battery cell 11 according to an embodiment of the present invention is described.

[0053] The battery cell 11 according to the present invention includes a battery cell body 111, which has a first side wall 1111 in the thickness direction, and n through holes 1112 are arranged on the first side wall 1111; wherein the area of ​​the first side wall 1111 is S0, the cross-sectional area of ​​the through hole 1112 is S, and satisfies: n*S≤(1-p)*S0, 80%≤p≤99.8%, and n is a positive integer greater than or equal to 1.

[0054] like Figure 1-Figure 6As shown, the battery cell 11 of the present application can reduce the stress concentration of the battery cell 11 during the cycle process, improve the uniformity of stress distribution, and suppress the deformation of the first side wall 1111, thereby reducing the expansion of the battery cell 11 and extending the cycle life and stability of the battery 1 by providing a through hole 1112 on the first side wall 1111 of the battery cell body 111. There can be one through hole 1112 on the first side wall 1111, and there can also be multiple through holes 1112 on the first side wall 1111. The provision of multiple through holes 1112 can more effectively suppress the deformation of the first side wall 1111 and further reduce the risk of expansion of the battery cell 11. S represents the cross-sectional area of ​​the through hole 1112, which represents the area of ​​the cross section cut out by the through hole 1112 in a direction perpendicular to the axis, and also represents the area of ​​the intersection formed by the intersection of the through hole 1112 and the surface of the first side wall 1111. n*S represents the total cross-sectional area of ​​the through hole 1112. The relationship between n*S and the area S0 of the first side wall 1111 indicates that the total cross-sectional area of ​​the through hole 1112 does not exceed the (1-p) part of the area of ​​the first side wall 1111. The parameter p is a value between 80% and 99.8%, which represents the ratio of the effective area (S0-n*S) of the first side wall 1111 to the area S0, and is positively correlated to the integration efficiency of the pack system. The parameter (1-p) represents the ratio of the area of ​​the through hole 1112 to the area of ​​the first side wall 1111. By limiting the parameter p between 80% and 99.8%, the volume expansion of the battery cell 11 can be effectively suppressed, and the energy density loss caused by the provision of the through hole 1112 can be minimized, thereby ensuring the energy density of the battery cell 11.

[0055] In particular, the area of ​​the first side wall 1111 can be larger than the area of ​​other surfaces of the battery body 111, and the first side wall 1111 is more likely to deform during the cycle of the battery 11, causing the battery 11 to expand. By providing the through hole 1112 on the first side wall 1111, the deformation of the first side wall 1111 can be suppressed, thereby more effectively reducing the risk of expansion of the battery 11.

[0056] Therefore, the battery cell 11 of the present application can suppress the volume expansion of the battery cell 11 by setting a through hole 1112 on the first side wall 1111 of the battery cell body 111, and the performance and life of the battery cell 11 will be significantly improved. By limiting the parameter p between 80% and 99.8%, the energy density of the battery cell 11 can be guaranteed.

[0057] According to some embodiments of the present invention, the first side walls 1111 are two spaced apart and facing each other in the thickness direction of the battery cell body 111, and at least one of the first side walls 111 is provided with a through hole 1112. The battery cell body 111 has two facing first side walls 1111, and the two first side walls 1111 are spaced apart from each other in the thickness direction of the battery cell body 111, so that the battery cell body 111 has good stability and structural strength, which helps to ensure the stability and safety of the battery cell 11. The through hole 1112 is provided on one of the two first side walls 111, or the through hole 1112 is provided on both of the two first side walls 111. When the through hole 1112 is provided on one of the two first side walls 111, the first side wall 111 provided with the through hole 1112 will be more difficult to deform, which can enhance the stability and safety of the battery 11. When the two first side walls 111 are provided with through holes 1112, the two first side walls 111 of the battery cell body 111 are difficult to deform, so the battery cell body 111 is difficult to expand in the thickness direction, and the overall stability is good. The through holes 1112 of the two first side walls 111 can be connected to each other, so that the stress distribution inside the battery cell body 111 is uniform, further enhancing the stability and safety of the battery cell 11.

[0058] According to some embodiments of the present invention, the battery cell body 111 is formed by stacking a positive electrode sheet and a negative electrode sheet; the through hole 1112 is formed with a first through hole on the positive electrode sheet, and the cross-sectional area of ​​the first through hole is S1; the through hole 1112 is formed with a second through hole on the negative electrode sheet, and the cross-sectional area of ​​the second through hole is S2; wherein the first through hole and the second through hole are arranged opposite to each other and satisfy S2≤S1. The positive electrode sheet and the negative electrode sheet are responsible for storing and releasing electric charge. By stacking the positive electrode sheet and the negative electrode sheet together, ion transmission and charge exchange can be achieved between the positive electrode sheet and the negative electrode sheet, thereby completing the charging and discharging process of the battery 1. A first through hole is provided on the positive electrode plate, and a second through hole is provided on the negative electrode plate. By arranging the first through hole and the second through hole opposite to each other, that is, the central axis of the first through hole and the central axis of the second through hole are on a straight line, the first through hole and the second through hole can be connected to form a through hole 1112 on the first side wall 1111. Specifically, the positive electrode sheets, the separators and the negative electrode sheets are alternately stacked to form the cell body 111. The cell body 111 has a positive electrode sheet and a negative electrode sheet on both sides in the thickness direction, so the cell body 111 has two first side walls 1111 spaced apart and facing each other in the thickness direction. One first side wall 1111 is the side wall of the positive electrode sheet and is formed with a first through hole, and the other first side wall 1111 is the side wall of the negative electrode sheet and is formed with a second through hole. The first through hole is arranged opposite to and connected with the second through hole, so that the cell body 111 has a through hole 1112 that penetrates in the thickness direction, and the two ends of the through hole 1112 are opened on the two first side walls 1111 of the cell body 111. The cross-sectional area S1 of the first through hole is not less than the cross-sectional area S2 of the second through hole, that is, in the through direction of the through hole 1112, the first through hole can completely cover the second through hole. Generally speaking, the area of ​​the negative electrode sheet is larger than that of the positive electrode sheet, so the remaining area of ​​the negative electrode sheet (equivalent to the area of ​​the negative electrode sheet minus the cross-sectional area of ​​the second through hole) is larger than the remaining area of ​​the positive electrode sheet (equivalent to the area of ​​the positive electrode sheet minus the cross-sectional area of ​​the first through hole), which can increase the storage space of the negative electrode sheet for ions, effectively inhibit the crystallization of ions on the negative electrode sheet, and improve the safety and stability of the battery 1. At the same time, because the electrochemical reaction of the negative electrode is more complex and more easily damaged than that of the positive electrode, the current density can be dispersed and the service life of the battery 1 can be extended by increasing the remaining area of ​​the negative electrode sheet.

[0059] According to some embodiments of the present invention, the positive and negative electrode materials of the battery cell 11 may include, but are not limited to, one or more of the positive electrode materials such as lithium iron phosphate, lithium manganese oxide, lithium cobalt oxide, lithium iron manganese phosphate, lithium sulfide, and one or more of the negative electrode materials such as graphite, silicon, silicon-oxygen, silicon carbon, and metallic lithium. In addition, the negative electrode may also be a metal foil current collector that does not initially contain a negative electrode active material, in which case the lithium source comes from the positive electrode active material.

[0060] According to some embodiments of the present invention, the cross-sectional area S1 of the first through hole and the cross-sectional area S1 of the second through hole satisfy: 0.8≤S2 / S1≤1, so that the negative electrode plate can completely cover the positive electrode plate without abnormal charging and discharging or short circuit, and at the same time, the capacity of the positive electrode active material can be maximized. The ratio of the cross-sectional area S2 of the second through hole to the cross-sectional area S1 of the first through hole is in the range of 0.8 to 1, that is, the cross-sectional area S2 of the second through hole is equal to the cross-sectional area S1 of the first through hole, or the cross-sectional area S2 of the second through hole is slightly smaller than the cross-sectional area S1 of the first through hole, and the first through hole and the second through hole are connected more smoothly, which facilitates the manufacturing process of the battery cell 11, and the cross-sectional change between the first through hole and the second through hole is smoother without obvious mutation, and the stress distribution inside the battery cell 11 is more uniform, which improves the safety and stability of the battery cell 11.

[0061] According to some embodiments of the present invention, the cell body 111 is provided with a diaphragm located between the positive electrode sheet and the negative electrode sheet, and the through hole 1112 is formed with a third through hole on the diaphragm, and the third through hole is arranged opposite to the first through hole and the second through hole respectively, and the cross-sectional area of ​​the third through hole is S3 and satisfies: S3≤S2≤S1. By arranging a diaphragm between the positive electrode sheet and the negative electrode sheet, the diaphragm can separate the positive electrode sheet from the negative electrode sheet, and the positive electrode sheet is difficult to directly contact the negative electrode sheet, thereby preventing the risk of short circuit. By arranging the third through hole on the diaphragm opposite to the first through hole and the second through hole respectively, that is, the central axis of the first through hole, the central axis of the second through hole and the central axis of the third through hole are all on a straight line, the third connecting hole connects the first through hole with the second connecting hole to form the through hole 1112 on the first side wall 1111. After stacking the positive electrode sheet, the diaphragm and the negative electrode sheet, a pole core is obtained, and then the diaphragm is perforated on the pole core to obtain a battery cell body 111 with a through hole 1112. By setting the cross-sectional area of ​​the third through hole to be less than or equal to the cross-sectional area of ​​the second through hole (i.e., S3≤S2), it is convenient to perform a hole opening treatment on the diaphragm in the pole core at the position of the second through hole of the negative electrode sheet, thereby reducing the processing difficulty.

[0062] According to some embodiments of the present invention, the cross-sectional shape of the through hole 1112 is circular or polygonal. Figure 1-Figure 6The cross-sectional shapes of the through holes 1112 shown are all circular. The through holes 1112 with a circular cross-sectional shape can provide a uniform diameter of the through holes 1112. The through holes 1112 with a polygonal cross-sectional shape can provide cross-sections of different shapes, such as rectangles, triangles or other polygons. By configuring the cross-sectional shape of the through holes 1112 to be circular or polygonal, the stress concentration of the battery cell 11 can be effectively reduced, the structural stability and service life of the battery cell 11 can be improved, and the processing technology of the through holes 1112 can be simplified, which facilitates the manufacturing process of the battery cell 11 and improves production efficiency. At the same time, it can adapt to different design and manufacturing requirements of the battery cell 11, and improve the manufacturing flexibility and applicability of the battery cell 11.

[0063] According to some embodiments of the present invention, Figure 3-Figure 6 As shown, the through holes 1112 are configured to be a plurality of through holes 1112 arranged at intervals on the first side wall 1111 , and the plurality of through holes 1112 are arranged on the first side wall 1111 in multiple rows and columns or in a single row or in a single column. Figure 3 and Figure 4 There are four through holes 1112 on the first side wall 1111 shown in FIG. Figure 5 and Figure 6 There are six through holes 1112 on the first side wall 1111 shown in FIG. By configuring the through holes 1112 as a plurality of through holes 1112 arranged at intervals on the first side wall 1111, the stress concentration of the battery cell 11 during the cycle process can be further reduced, and the uniformity of stress distribution can be improved, thereby further reducing the expansion of the battery cell 11 and extending the cycle life and stability of the battery 1. When the number of arranged through holes 1112 is small, the multiple through holes 1112 can be arranged in a single row or a single column on the first side wall 1111, and the arrangement is simple, which reduces the manufacturing difficulty; when the number of arranged through holes 1112 is large, the multiple through holes 1112 can be arranged in multiple rows and columns on the first side wall 1112. By arranging the multiple through holes 1112 in multiple rows and columns on the first side wall 1111, the multiple rows and columns arrangement refers to arranging the through holes 1112 in the longitudinal and transverse directions to form multiple rows and columns. The multiple through holes 1112 can be evenly distributed on the first side wall 1111, further improving the uniformity of stress distribution, more effectively suppressing the deformation of the first side wall 1111, and further reducing the risk of expansion of the battery cell 11.

[0064] Reference below Figure 7-Figure 11 A battery 1 according to the invention is described.

[0065] The battery 1 according to the present invention includes a shell 12 and a battery cell 11. A housing cavity suitable for accommodating the battery cell 11 is formed in the shell 12. The battery cell 11 is constructed as the battery cell 11 in any one of the above embodiments, and the battery cell 11 is accommodated in the housing cavity. The housing cavity is a part of the interior of the shell 12. The size and shape of the housing cavity match the battery cell 11, so that the battery cell 11 can be accommodated in the housing cavity. By accommodating the battery cell 11 in the housing cavity, the shell 12 can protect the battery cell 11 in the housing cavity, and the shell 12 can isolate the battery cell 11 from the external environment, provide a stable working environment for the battery cell 11, reduce the loss of substances inside the battery 1, and improve the reliability and stability of the battery 1.

[0066] The battery 1 according to the present invention includes the battery cell 11 in any one of the above embodiments. Since the battery 1 according to the present invention includes the battery cell 11 in any one of the above embodiments, the battery 1 according to the present invention can reduce the risk of expansion of the battery cell 11 during use, improve the service life and stability, and the energy density of the battery 1 can be guaranteed because the design of the battery cell 11 takes stress distribution and uniformity into consideration.

[0067] According to some embodiments of the present invention, the housing 12 can be made of one or more materials selected from metal foils such as aluminum, stainless steel, and alloys thereof. The housing 12 has excellent electrical conductivity, corrosion resistance, and mechanical processing properties, and can meet the use requirements of the battery 1 under high voltage, high current, and harsh environments. At the same time, the material of the metal foil and its alloy can also improve the rigidity and strength of the housing 12, ensuring the safety and stability of the battery 1.

[0068] According to some embodiments of the present invention, a liquid injection hole is provided on the housing 12, and the liquid injection hole is connected to the accommodating chamber. The liquid injection hole is used to inject electrolyte into the accommodating chamber. When the liquid injection step is implemented, the electrolyte is injected into the accommodating chamber through the liquid injection hole to complete the capacity separation process of the battery 1. The liquid injection hole is sealed after the capacity separation is completed to maintain the amount of electrolyte in the accommodating chamber and prevent the electrolyte from leaking. By providing the liquid injection hole, the injection of electrolyte and the capacity separation process of the battery 1 can be conveniently performed, thereby improving the production efficiency and manufacturing quality of the battery 1.

[0069] According to some embodiments of the present invention, a connection protrusion is provided on the shell 12, which is located in the accommodating cavity and corresponds to the through hole 1112, and the connection protrusion is accommodated in the through hole 1112. By providing the connection protrusion located in the accommodating cavity and corresponding to the through hole 1112 on the shell 12, and the connection protrusion is accommodated in the through hole 1112, the connection and fixation between the battery cell 11 and the shell 12 can be further enhanced, and the stability and safety of the battery 1 can be improved. The shape and size of the connection protrusion match the through hole 1112, so that the connection protrusion can be accommodated in the through hole 1112. The connection protrusion cooperates with the through hole 1112 to generate stress, which will improve the fastening effect between the battery cell 11 and the shell 12, and can inhibit the deformation of the shell 12 caused by the expansion of the battery cell 11. The shell 12 is not easily damaged to cause leakage, and the stability and safety of the battery 1 are further enhanced.

[0070] According to some embodiments of the present invention, the connection protrusion is detachably connected to the shell 12. By detachably connecting the connection protrusion to the shell 12, the battery 1 can be easily assembled, and different battery cells 11 and connection protrusions can be selected for combination as needed to meet the production of batteries 1 with different specifications and requirements. In particular, one end of the connection protrusion is accommodated in the through hole 1112, and the other end of the connection protrusion is detachably connected to the shell. By constructing the end surface area of ​​the other end of the connection protrusion to be larger than the cross-sectional area S of the through hole 1112, the connection protrusion will be reliably connected to the shell 12, which can limit the expansion of the pole piece.

[0071] According to some embodiments of the present invention, the connection protrusion and the shell 12 are constructed as an integrally formed part. By constructing the connection protrusion and the shell 12 as an integrally formed part, the assembly steps can be simplified, the manufacturing cost can be reduced, and the production efficiency can be improved. In addition, the integrally formed part has better integrity and stability, can better withstand external pressure and vibration, and improves the durability and reliability of the battery 1.

[0072] According to some embodiments of the present invention, Figure 7 , Figure 8 and Fig. 9As shown, the housing 12 includes a first housing 121 and a second housing 122, wherein the first housing 121 and the second housing 122 are connected to define a receiving cavity between the first housing 121 and the second housing 122; wherein the first housing 121 is provided with a limiting sleeve 1211 extending toward the second housing 122, and a mounting cavity 1212 is formed in the limiting sleeve 1211; and the second housing 122 is provided with a limiting column 1221 received in the mounting cavity 1212, and the limiting column 1221 cooperates with the limiting sleeve 1211 to be configured as a connecting protrusion. By connecting the first housing 121 and the second housing 122, a receiving cavity can be defined between the first housing 121 and the second housing 122, and the receiving cavity is used to accommodate the battery cell 11. By providing a limiting sleeve 1211 extending toward the second shell 122 on the first shell 121, and providing a limiting column 1221 on the second shell 122, the limiting column 1221 can be accommodated in the installation cavity 1212 of the limiting sleeve 1211, and the matching between the limiting column 1221 and the limiting sleeve 1211 is accurate and convenient, which speeds up the assembly efficiency of the battery 1 and improves the accuracy and performance of the battery 1. The matching design of the limiting sleeve 1211 and the limiting column 1221 realizes the reliable connection and fixation between the battery 11 and the shell 12, and improves the stability and safety of the battery 1.

[0073] According to some embodiments of the present invention, the limiting column 1221 and the limiting sleeve 1211 can be made of insulating materials such as bakelite and plastic or metal materials such as aluminum and stainless steel. When a metal material is used, in order to reduce the risk of short circuit or arc generation on the outer surface of the limiting sleeve 1211, a layer of polymer insulating material can be wrapped on the outer surface of the limiting sleeve 1211, such as one or more of ethylene (PE), polypropylene (PP), polytetrafluoroethylene (PTFE) and polyimide (PI). The limiting column 1221 and the limiting sleeve 1211 will have excellent insulation performance and mechanical strength, thereby improving the safety and stability of the battery 1.

[0074] According to some embodiments of the present invention, Fig. 9 , Fig.10 and Fig.11As shown, a first clamping portion 1211a is provided on the inner wall of the limiting sleeve 1211, and a second clamping portion 1221a is formed on the outer periphery of the limiting column 1221 to be clamped and matched with the first clamping portion 1211a, and the first clamping portion 1211a and the second clamping portion 1221a are suitable for limiting the separation of the limiting sleeve 1211 and the limiting column 1221. By providing the first clamping portion 1211a and the second clamping portion 1221a, the limiting sleeve 1211 and the limiting column 1221 can be clamped and matched to each other, which can effectively limit the separation of the limiting sleeve 1211 and the limiting column 1221, thereby improving the safety of the battery 1, further improving the impact resistance of the battery 1, facilitating rapid and accurate assembly and production, reducing production costs, and improving production efficiency.

[0075] According to some embodiments of the present invention, the battery 1 further includes an adhesive layer, which is arranged between the inner wall of the limiting sleeve 1211 and the outer surface of the limiting column 1221. The adhesive layer is filled between the inner wall of the limiting sleeve 1211 and the outer surface of the limiting column 1221, and plays the role of bonding, fixing and buffering. By providing the adhesive layer, the connection reliability between the limiting sleeve 1211 and the limiting column 1221 is further enhanced. The adhesive layer has sufficient bonding strength and can firmly bond the limiting sleeve 1211 and the limiting column 1221 together. At the same time, the adhesive layer can absorb shock and vibration, thereby improving the impact resistance of the battery 1.

[0076] According to some embodiments of the present invention, the adhesive layer can be made of one or more materials selected from epoxy resin, acrylate, polyurethane, polyimide and phenolic resin. The adhesive layer has excellent bonding performance, high temperature resistance and insulation performance, and can play the role of filling, bonding and protecting the connection between the limiting sleeve 1211 and the limiting column 1221, further improving the safety and stability of the battery 1.

[0077] According to some embodiments of the present invention, the first housing 121 includes a first bottom plate 121a and a first side plate 121b, a limiting sleeve 1211 is provided on the first bottom plate 121a; the first side plate 121b is provided at the periphery of the first bottom plate 121a; the second housing 122 includes a second bottom plate 122a and a second side plate 122b, a limiting column 1221 is provided on the second bottom plate 122a; the second side plate 122b is provided at the periphery of the second bottom plate 122a, and the second side plate 122b is connected to the first side plate 121b to form a receiving cavity between the first bottom plate 121a and the second bottom plate 122a. The connection between the first side plate 121b and the second side plate 122b can realize the connection between the first housing 121 and the second housing 122, so that the battery cell 11 can be firmly fixed in the receiving cavity formed by the first housing 121 and the second housing 122, which facilitates the manufacturing and assembly process of the battery 1 and improves the production efficiency. In addition, the sealing of the accommodating cavity can be achieved by sealing the first side plate 121b and the second side plate 122b, making the sealing of the accommodating cavity more convenient and reliable. And by providing the limiting sleeve 1211 on the first bottom plate 121a and the limiting column 1221 on the second bottom plate 122a, the limiting column 1221 and the limiting sleeve 1211 can be precisely matched, so that the battery cell 11 can be accurately fixed in the accommodating cavity.

[0078] The housing assembly according to the present invention is briefly described below.

[0079] The shell assembly according to the present invention is used for the battery 1 in any one of the above-mentioned embodiments, and the shell assembly includes: a shell 12, in which a receiving cavity suitable for receiving the battery cell 11 is formed; a connecting protrusion, which is arranged on the shell 12 and received in the receiving cavity, and the connecting protrusion is suitable for penetrating a through hole. Since the shell assembly according to the present invention is used for the battery 1 in any one of the above-mentioned embodiments, the shell assembly according to the present invention can cooperate with the through hole 1112 on the battery cell through the connecting protrusion arranged on the shell 12, so that the battery cell 11 can be more reliably fixed in the receiving cavity, thereby improving the reliability and safety of the battery 1.

[0080] The electrical equipment according to the present invention is briefly described below.

[0081] The electric device according to the present invention includes the battery 1 in any one of the above embodiments. Since the electric device according to the present invention includes the battery 1 in any one of the above embodiments, the electric device according to the present invention has high stability and high safety, and can maintain stable performance under different environments and conditions. Since the battery 1 has high safety and long service life, it can meet the needs of long-term use.

[0082] An experimental method is provided below to verify the electrochemical cycle performance of the battery 1 according to an embodiment of the present invention.

[0083] Experimental preparation:

[0084] Standard positive electrode sheet preparation: The positive electrode active material (LiNi 0.70 Co 0.10 Mn 0.20 O2) 48.5g, conductive agent (acetylene black) 1.0g and binder (polyvinylidene fluoride, PVDF) 0.5g were mixed in N-methylpyrrolidone (NMP) to form a stable and uniform slurry, wherein the stirring speed of the vacuum mixer was 1000rpm and the stirring time was 12h; then the obtained slurry was coated on the current collector aluminum sheet, and the surface density was controlled to be 395g / m 2 , then dried at 80°C and rolled by a roller press to obtain a standard positive electrode sheet.

[0085] Preparation of standard negative electrode sheet: Pure copper foil without negative electrode active materials such as graphite and silicon is selected as the standard negative electrode sheet, and the thickness of the copper foil is 8μm.

[0086] Embodiment 1 (battery core 11 has only one through hole 1112)

[0087] Production of battery cell 11: Take a standard positive electrode sheet and perform die-cutting under a specific positive electrode die-cutting die to die-cut a positive electrode sheet with only one through hole 1112. The dressing area size is 270×90mm. The cross-sectional shape of the through hole 1112 is circular. The through hole 1112 is located in the center of the positive electrode sheet dressing area. The radius of the through hole 1112 is 10.5mm. Take a standard negative electrode sheet (10 micron thick copper foil) and perform die-cutting under a specific negative electrode die-cutting die to die-cut a negative electrode sheet with only one through hole 1112. The size of the lug area is 274×94mm, the cross-sectional shape of the through hole 1112 is circular, the through hole 1112 is located in the center of the electrode sheet dressing area, and the radius of the through hole 1112 is 9.0mm. The die-cut positive electrode sheet, negative electrode sheet and separator are stacked in a Z-shape, wherein the positive electrode sheet has 9 layers, the negative electrode sheet has 10 layers and the separator sheet has 20 layers. The stacked battery cell 11 is hot pressed at a temperature of 80°C / 3 minutes, and then a hole opener is used to open a hole in the through hole 1112 of the negative electrode sheet, and the radius of the through hole 1112 is 8.4 mm (i.e., the hole on the diaphragm).

[0088] Production of battery 1: A limiting sleeve 1211 is provided on the first shell 121 of battery 1, and a limiting column 1221 is provided on the second shell 122 of battery 1. Among them, the outer radius of the limiting sleeve 1211 on the first shell 121 is 8.0 mm, and the limiting sleeve 1211 cooperates with the limiting column 1221 to buckle the first shell 121 and the second shell 122 together and fix them. In order to further ensure the sealing of battery 1, laser welding is used to weld and seal the first shell 121 and the second shell 122 around. Finally, the assembled battery 1 is baked at 80°C, and the unfilled battery obtained is S1.

[0089] Embodiment 2:

[0090] The difference from Example 1 is that two through holes 1112 are provided on the battery body 111, and the two through holes 1112 have the same size. The dressing area size of the positive electrode plate is 270×90mm, the cross-sectional shape of the through hole 1112 is circular, and the radius of the through hole 1112 is 20mm. Take a standard negative electrode plate (the negative electrode active material is nanosilicon, and the mass percentage of silicon is 95%), and also die-cut it under a specific negative electrode die-cutting mold to die-cut a negative electrode plate with two through holes 1112. The size of the area excluding the ear is 274×94mmmm, and the radius of the through hole 1112 is 18mm. The die-cut positive electrode plate, negative electrode plate and diaphragm are stacked in a Z shape; the opening of the diaphragm is 16mm; at the same time, the outer radius of each corresponding upper limit sleeve 1211 of the first shell 121 is 15.0mm, and the unfilled battery obtained is S2.

[0091] Embodiment 3:

[0092] The difference from Example 1 is that the radius of the through hole 1112 on the positive electrode plate is 36.4 mm, and the radius of the through hole 1112 on the negative electrode plate is 33 mm; the opening of the diaphragm is 32 mm; at the same time, the outer radius of the upper limit sleeve 1211 of the first shell 121 is 30.0 mm, and the obtained unfilled battery is S3.

[0093] Embodiment 4:

[0094] The difference from Example 3 is that the radius of the through hole 1112 on the positive electrode plate is 36.4 mm, and the radius of the through hole 1112 on the negative electrode plate is 28 mm; the opening of the diaphragm is 26 mm; at the same time, the outer radius of the upper limit sleeve 1211 on the first shell 121 is 24.0 mm, and the obtained unfilled battery is S4.

[0095] Comparative Example 1

[0096] Neither the positive electrode plate nor the negative electrode plate (10-micron thick copper foil) has a through hole, and the battery cell is not processed with a through hole after lamination. No connecting protrusion is provided in the accommodating cavity of the shell. Other process steps remain consistent, and the obtained unfilled battery is DS1.

[0097] Comparative Example 2

[0098] The difference from Example 1 is that: the radius of the through hole on the positive electrode plate is 3.0 mm; the radius of the through hole on the negative electrode plate is 2.7 mm; the opening of the diaphragm is 2.5 mm; and at the same time, the outer radius of the upper limit sleeve of the first shell is 2.0 mm. The obtained unfilled battery is DS2.

[0099] Comparative Example 3

[0100] The difference from Example 2 is that: the number of through holes is 4, the radius of the through holes on the positive electrode plate is 20.0 mm; the radius of the through holes on the negative electrode plate is 18.0 mm; the opening of the diaphragm is 16.0 mm; at the same time, the outer radius of the upper limit sleeve 1211 of the first shell 121 is 20.0 mm, and the obtained unfilled battery is DS3.

[0101] Test methods and results:

[0102] The battery 1 obtained in the embodiment of the present invention and the control experiment was subjected to an electrochemical cycle test to evaluate the cycle performance of the battery 1 .

[0103] The test conditions are as follows: the electrolyte is 1 wt % LiNO 3 dissolved in 4 M LiFSI in ethylene glycol dimethyl ether (DME), and the test temperature is 25°C.

[0104] The test steps are as follows:

[0105] Energy density test: Battery 1 was subjected to a charge and discharge cycle test at a rate of 0.2C, the steps included placing Battery 1 aside for 10 minutes, then charging Battery 1 at a constant current of 0.2C to 4.3V, then charging at a constant voltage to 4.3V / 0.05C cut-off, placing Battery 1 aside for 10 minutes, and finally discharging Battery 1 at 0.5C to 3.0V. The obtained capacity is the actual discharge capacity of Battery 1. Battery energy density = discharge capacity / battery mass, as shown in Table 1.

[0106] Cycle: The battery was charged and discharged at a rate of 0.2C. The steps included leaving the battery for 10 minutes, then charging battery 1 at a constant current of 0.2C to 4.3V, then charging at a constant voltage to 4.3V / 0.05C cutoff, leaving the battery for another 10 minutes, and finally discharging battery 1 at 0.5C to 3.6V to complete one cycle.

[0107] Repeat the above steps. When the capacity of battery 1 is less than 80% of the initial discharge capacity, the cycle is terminated. The number of cycles is the cycle life of battery 1. Two batteries are taken from each of Example 1 and Comparative Example 1. The specific experimental data are shown in Fig.12 , Fig.12 The figure is a comparison chart of the battery cycle performance data of Example 1 and Comparative Example 1. The capacity retention rate refers to the ratio between the actual capacity of the battery and the initial capacity during the use of the battery, reflecting the degree of performance degradation of the battery during use. The cycle life refers to the number of times the battery can maintain normal operation after multiple charges and discharges.

[0108] Depend on Fig.12 It can be seen that after the battery of Example 1 and the battery of Comparative Example 1 have been cycled a certain number of times, the capacity retention rate of Example 1 is greater than that of Comparative Example 1, indicating that the battery of Example 1 has a smaller degree of performance degradation during use than the battery of Comparative Example 1, and the battery has better stability and service life. In addition, the battery of Comparative Example 1 can maintain a capacity retention rate of more than 95% within approximately 50 cycles, while the battery of Example 1 can maintain a capacity retention rate of more than 95% within approximately 200 cycles, indicating that the battery of Example 1 has a significant improvement in cycle life compared to the battery of Comparative Example 1. In addition, from Fig.12 It can also be concluded that the capacity retention rate of the battery in comparative example 1 begins to decrease rapidly after about 50 cycles, while the capacity retention rate of the battery in embodiment 1 begins to decrease significantly after about 200 cycles, further proving the superiority of the battery in embodiment 1 in terms of cycle life.

[0109] The thickness of the shell corresponding to the large surface of the battery before and after the cycle was measured with a thickness gauge, and the thickness change rate of the shell 12 of the battery 1 before and after the cycle was calculated, as shown in Table 1. Table 1 is a comparison table of the cycle performance data of each battery in Examples 1-4 and Comparative Examples 1-3.

[0110] From the comparison of the battery cycle performance data of the batteries S1-S4 of Examples 1-4 and the batteries DS1-DS3 of Comparative Examples 1-3, it can be seen that the batteries S1-S4 are provided with through holes 1112, which greatly improves the cycle life of the battery S1 and significantly reduces the battery thickness change rate, indicating that the setting of the through holes 1112 has a positive effect on the performance and stability of the battery, extends the cycle life of the battery, and the battery thickness change rate is reduced, which means that the expansion of the battery during the charge and discharge process is better controlled, further improving the stability of the battery.

[0111] Table 1

[0112]

[0113] It can be concluded that the battery 1 (S1, S2, S3 and S4) obtained by the embodiment of the present invention has a higher comprehensive performance of cycle life, volume energy density and battery volume expansion than the batteries (DS1, DS2 and DS3) obtained by the control experiment, indicating that the structure of battery 1 is more stable and the energy density of the battery is within a suitable range.

[0114] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0115] In the description of the present invention, "first feature" or "second feature" may include one or more of the features.

[0116] In the description of the present invention, "plurality" means two or more.

[0117] In the description of the present invention, a first feature being “on” or “under” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact with each other but are in contact with each other via another feature therebetween.

[0118] In the description of the present invention, “on”, “over” and “above” a first feature from a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0119] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0120] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized in that: include: A battery cell body (111), the battery cell body (111) having a first side wall (1111) in a thickness direction, the first side wall (1111) being provided with n through holes (1112); wherein The area of ​​the first side wall (1111) is S0, the cross-sectional area of ​​the through hole (1112) is S, and the following conditions are satisfied: n*S≤(1-p)*S0, 80%≤p≤99.8%, and n is a positive integer greater than or equal to 1.

2. The battery cell according to claim 1, characterized in that: The first side walls (1111) are two side walls that are spaced apart from each other and face each other in the thickness direction of the battery cell body (111), and the through hole (1112) is provided on at least one of the first side walls (111).

3. The battery cell according to claim 1, characterized in that: The battery cell body (111) is formed by stacking a positive electrode sheet and a negative electrode sheet; The through hole (1112) is formed with a first through hole on the positive electrode plate, and the cross-sectional area of ​​the first through hole is S1; The through hole (1112) forms a second through hole on the negative electrode plate, and the cross-sectional area of ​​the second through hole is S2; wherein The first through hole and the second through hole are arranged opposite to each other and satisfy S2≤S1.

4. The battery cell according to claim 3, characterized in that: A cross-sectional area S1 of the first through hole and a cross-sectional area of ​​the second through hole satisfy: 0.8≤S2 / S1≤1.

5. The battery cell according to claim 3, characterized in that: The battery cell body (111) is provided with a diaphragm located between the positive electrode plate and the negative electrode plate, and the through hole (1112) is formed with a third through hole on the diaphragm, and the third through hole is respectively arranged opposite to the first through hole and the second through hole, and the cross-sectional area of ​​the third through hole is S3 and satisfies: S3≤S2≤S1.

6. The battery cell according to claim 1, characterized in that: The cross-sectional shape of the through hole (1112) is circular or polygonal.

7. The battery cell according to any one of claims 1 to 6, characterized in that: The through holes (1112) are configured as a plurality of through holes arranged at intervals on the first side wall (1111), and the plurality of through holes (1112) are arranged on the first side wall (1111) in multiple rows and columns or in a single row or in a single column.

8. A battery, characterized in that: include: A housing (12), wherein a housing cavity suitable for accommodating the battery cell (11) is formed in the housing (12); A battery cell (11), wherein the battery cell (11) is constructed as the battery cell (11) according to any one of claims 1 to 7, and the battery cell (11) is accommodated in the accommodating cavity.

9. The battery according to claim 8, characterized in that The shell (12) is provided with a connecting protrusion located in the accommodating cavity and corresponding to the through hole (1112), and the connecting protrusion is accommodated in the through hole (1112).

10. The battery according to claim 9, characterized in that The connecting protrusion is detachably connected to the shell (12).

11. The battery according to claim 9, characterized in that The housing (12) comprises: A first shell (121) and a second shell (122), wherein the first shell (121) and the second shell (122) are connected to define the accommodating cavity between the first shell (121) and the second shell (122); The first shell (121) is provided with a limiting sleeve (1211) extending toward the second shell (122), and a mounting cavity (1212) is formed in the limiting sleeve (1211); the second shell (122) is provided with a limiting column (1221) accommodated in the mounting cavity (1212), and the limiting column (1221) cooperates with the limiting sleeve (1211) to be configured as the connecting protrusion.

12. The battery according to claim 11, characterized in that A first clamping portion (1211a) is provided on the inner wall of the limiting sleeve (1211), and a second clamping portion (1221a) is formed on the outer periphery of the limiting column (1221) to be clamped with the first clamping portion (1211a), and the first clamping portion (1211a) and the second clamping portion (1221a) are suitable for limiting the separation of the limiting sleeve (1211) and the limiting column (1221) from each other.

13. The battery according to claim 12, characterized in that Also includes: An adhesive layer, wherein the adhesive layer is arranged between the inner wall of the limiting sleeve (1211) and the outer surface of the limiting column (1221).

14. The battery according to claim 11, characterized in that The first housing (121) comprises: A first bottom plate (121a), wherein the limiting sleeve (1211) is arranged on the first bottom plate (121a); A first side plate (121b), the first side plate (121b) being arranged on the outer periphery of the first bottom plate (121a); The second housing (122) comprises: A second bottom plate (122a), the limiting column (1221) being arranged on the second bottom plate (122a); A second side plate (122b), wherein the second side plate (122b) is arranged on the outer periphery of the second bottom plate (122a), and the second side plate (122b) is connected to the first side plate (121b) to form the accommodating cavity between the first bottom plate (121a) and the second bottom plate (122a).

15. A shell assembly for the battery cell according to any one of claims 1 to 7, characterized in that: include: A housing (12), wherein a housing cavity suitable for accommodating the battery cell (11) is formed in the housing (12); A connecting protrusion is arranged on the shell and accommodated in the accommodating cavity, and the connecting protrusion is suitable for penetrating the through hole (1112).

16. An electrical equipment, characterized in that: A battery (1) comprising the battery (1) according to any one of claims 8 to 14.

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