Battery cell, battery, casing assembly, and electric device

Abstract

A battery cell (11), a battery (1), a casing assembly, and an electric device. The battery cell (11) comprises a battery cell body (111), the battery cell body (111) has a first side wall (1111) in a thickness direction, and n through holes (1112) are formed in the first side wall (1111); the area of the first side wall (1111) is S0, the cross-sectional area of each through hole (1112) is S, and it is satisfied: n*S≤(1-p)*S0, wherein 80%≤p≤99.8%, and n is a positive integer greater than or equal to 1.

Description

Battery cells, batteries, housing components and electrical equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This disclosure claims priority to Chinese patent application number 202311811237.3, filed on December 26, 2023, entitled “Battery Cell, Battery, Housing Assembly and Electrical Equipment,” the entire contents of which are incorporated by reference into this disclosure. Technical Field

[0003] The present disclosure relates to the field of battery technology, and in particular to a battery cell, a battery, a housing assembly, and an electrical device. Background Art

[0004] With the continuous advancement of technology, batteries, as core components for energy storage and output, are becoming increasingly important for the operation of the entire system. Among various battery systems, lithium-ion batteries (LIBs), whose negative electrodes consist of lithium metal or silicon materials, have attracted widespread attention due to their high energy density and long lifespan.

[0005] However, the volume expansion rate of lithium metal and silicon-based materials is relatively high. During the battery cycle, the high volume expansion causes changes in the volume of the battery cells, which can cause uneven force on the battery cells, rapid life degradation, and battery bulging. Summary of the Invention

[0006] The present disclosure aims to solve one of the technical problems in the related art at least to a certain extent.

[0007] To this end, one objective of the present disclosure is to provide a battery cell.

[0008] Another object of the present disclosure is to provide a battery having the above-mentioned battery cell.

[0009] Another object of the present disclosure is to provide a housing assembly for the above-mentioned battery cell.

[0010] Another object of the present disclosure is to provide an electrical device having the battery.

[0011] According to the present disclosure, the battery cell includes: a battery cell body, the battery cell body having a first side wall in the thickness direction, and n through holes are provided 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 it satisfies: n*S≤(1-p)*S0, 80%≤p≤99.8%, and n is a positive integer greater than or equal to 1.

[0012] According to the battery cell disclosed herein, by providing a through hole on the first sidewall of the battery cell body, stress concentration during cycling can be reduced, stress distribution uniformity can be improved, deformation of the first sidewall can be suppressed, and thus the expansion of the battery cell can be reduced, extending the cycle life and stability of the battery. The first sidewall can have one through hole or multiple through holes. The provision of multiple through holes can more effectively suppress deformation of the first sidewall, further reducing the risk of battery cell expansion. S represents the cross-sectional area of ​​through hole 1112, representing the area of ​​the cross section of through hole 1112 cut perpendicular to the axis, and also represents the area of ​​the intersection of through hole 1112 and the surface of first sidewall 1111. n*S represents the total cross-sectional area of ​​the through holes. The relationship between n*S and the area S0 of the first sidewall indicates that the total cross-sectional area of ​​the through holes does not exceed the (1-p) portion of the area of ​​the first sidewall. The parameter p is a value between 80% and 99.8% and represents the ratio of the effective area (S0 - n*S) of the first sidewall 1111 to the area S0. The parameter (1-p) represents the proportion of the total cross-sectional area of ​​the through-hole 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-hole can be minimized, 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.

[0013] According to some embodiments of the present disclosure, there are two first side walls 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 provided on at least one of the first side walls.

[0014] According to some embodiments of the present disclosure, the battery cell body is formed by stacking positive electrode sheets and negative electrode sheets; the through hole is formed on the positive electrode sheet, and the cross-sectional area of ​​the first through hole is S1; the through hole is formed 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.

[0015] According to some embodiments of the present disclosure, 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.

[0016] According to some embodiments of the present disclosure, 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. 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.

[0017] According to some embodiments of the present disclosure, the cross-sectional shape of the through hole is circular or polygonal.

[0018] According to some embodiments of the present disclosure, 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 a single column.

[0019] The battery according to the present disclosure is briefly described below.

[0020] The battery according to the present disclosure includes: a shell having a receiving cavity formed therein for receiving a battery cell; and a battery cell, the battery cell being constructed as the battery cell described in any one of the above embodiments and being received in the receiving cavity.

[0021] The battery according to the present disclosure includes the battery cell described in any one of the above embodiments. Since the battery according to the present disclosure includes the battery cell described in any one of the above embodiments, the battery according to the present disclosure can reduce the risk of battery cell expansion during use, improve service life and stability, and ensure the energy density of the battery because the battery cell design takes stress distribution and uniformity into consideration.

[0022] According to some embodiments of the present disclosure, a connecting protrusion located in the accommodating cavity and corresponding to the through hole is provided on the shell, and the connecting protrusion is accommodated in the through hole.

[0023] According to some embodiments of the present disclosure, the connecting protrusion is detachably connected to the shell.

[0024] According to some embodiments of the present disclosure, 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.

[0025] According to some embodiments of the present disclosure, a first clamping portion is provided on the inner wall of the limiting sleeve, and a second clamping portion is formed on the outer periphery of the limiting column to engage with the first clamping portion, 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.

[0026] According to some embodiments of the present disclosure, the battery further includes: an adhesive layer, wherein the adhesive layer is disposed between the inner wall of the limiting sleeve and the outer surface of the limiting post.

[0027] According to some embodiments of the present disclosure, the first shell includes a first bottom plate and a first side plate, and the limiting sleeve is provided on the first bottom plate; the first side plate is provided 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 provided on the second bottom plate; the second side plate is provided 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.

[0028] The housing assembly according to the present disclosure is briefly described below.

[0029] The shell assembly according to the present disclosure is used for the battery described in any of the above-mentioned embodiments, and the shell assembly includes: a shell having a housing formed therein for accommodating a battery cell; and a connecting protrusion disposed on the shell and received within the housing cavity, the connecting protrusion being adapted to penetrate the through-hole. Since the shell assembly according to the present disclosure is used for the battery described in any of the above-mentioned embodiments, the shell assembly according to the present disclosure can more reliably secure the battery cell within the housing cavity by means of the connecting protrusion disposed on the shell and cooperating with the through-hole on the battery cell, thereby improving the reliability and safety of the battery.

[0030] The following briefly describes the electric device according to the present disclosure.

[0031] The electrical device according to the present disclosure includes the battery described in any of the above embodiments. Because the electrical device according to the present disclosure includes the battery described in any of the above embodiments, the electrical device according to the present disclosure has high stability and high safety, and can maintain stable performance under different environments and conditions. Due to the high safety and long service life of the battery, it can meet the needs of long-term use.

[0032] Additional aspects and advantages of the present disclosure will be given in part in the description that follows and, in part, will be obvious from the description that follows, or will be learned through practice of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] FIG1 is a schematic structural diagram of a battery cell according to an embodiment of the present disclosure;

[0034] FIG2 is a front view of a battery cell according to an embodiment of the present disclosure;

[0035] FIG3 is a schematic structural diagram of a battery cell according to another embodiment of the present disclosure;

[0036] FIG4 is a front view of a battery cell according to another embodiment of the present disclosure;

[0037] FIG5 is a schematic structural diagram of a battery cell according to another embodiment of the present disclosure;

[0038] FIG6 is a front view of a battery cell according to another embodiment of the present disclosure;

[0039] FIG7 is a schematic structural diagram of a first housing of a battery according to an embodiment of the present disclosure;

[0040] FIG8 is a schematic structural diagram of a second housing of a battery according to an embodiment of the present disclosure;

[0041] 9 is a schematic cross-sectional view of a first housing and a second housing of a battery according to one embodiment of the present disclosure;

[0042] FIG10 is a partial enlarged view of point A in FIG9;

[0043] FIG11 is a partial enlarged view of point B in FIG9 ;

[0044] FIG12 is a comparison chart of the battery cycle performance data in Example 1 and Comparative Example 1.

[0045] Figure 1: Battery 1; Battery cell 11; Battery cell body 111, first side wall 1111, through hole 1112; Shell 12; First shell 121, limiting sleeve 1211, first clamping portion 1211a, mounting cavity 1212, first bottom plate 121a, first side plate 121b; Second shell 122, limiting column 1221, second clamping portion 1221a, second bottom plate 122a, second side plate 122b. DETAILED DESCRIPTION

[0046] The following describes in detail embodiments of the present disclosure, 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 intended to be used to explain the present disclosure, and should not be construed as limiting the present disclosure.

[0047] In related technologies, electrochemical systems with high volume expansion often face problems such as uneven stress on the cells, rapid life degradation, and battery bulging due to changes in the cell volume during the cycle process.

[0048] The battery cell 11 according to an embodiment of the present disclosure will be described below with reference to FIG. 1 to FIG. 6 .

[0049] According to the present disclosure, the battery cell 11 includes a battery cell body 111, which has a first side wall 1111 in the thickness direction, and n through holes 1112 are provided 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.

[0050] As shown in Figures 1 to 6, the battery cell 11 disclosed herein, by providing a through hole 1112 on the first side wall 1111 of the battery cell body 111, 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. There can be one through hole 1112 on the first side wall 1111, or there can 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 produced 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) portion of the area of ​​the first side wall 1111. The parameter p is a value between 80% and 99.8%, representing the ratio of the effective area (S0-n*S) of the first side wall 1111 to the area S0. 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 to 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.

[0051] In particular, the area of ​​the first sidewall 1111 can be larger than the area of ​​other surfaces of the battery cell body 111. The first sidewall 1111 is more likely to deform during the cycle of the battery cell 11, causing the battery cell 11 to expand. By providing the through hole 1112 on the first sidewall 1111, the deformation of the first sidewall 1111 can be suppressed, thereby more effectively reducing the risk of battery cell 11 expansion.

[0052] Therefore, the battery cell 11 disclosed herein 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.

[0053] According to some embodiments of the present disclosure, 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 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 through holes 1112 are provided on both first side walls 111, both 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. In addition, 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.

[0054] According to some embodiments of the present disclosure, two first side walls 1111 are spaced apart and face each other in the thickness direction of the battery cell body 111. A through hole 1112 is provided on each of the two first side walls 111, and the through holes 1112 are positioned correspondingly to form a through hole. Since both first side walls 111 of the battery cell body 111 are difficult to deform, the battery cell body 111 is unlikely to expand in the thickness direction, resulting in good overall stability. Furthermore, the through holes 1112 in each of the two first side walls 111 can communicate with each other, resulting in a uniform stress distribution within the battery cell body 111. This further enhances the stability and safety of the battery cell 111 and facilitates processing.

[0055] According to some embodiments of the present disclosure, the battery cell body 111 is formed by stacking a positive electrode sheet and a negative electrode sheet; a first through-hole is formed in the positive electrode sheet of the through-hole 1112, and the cross-sectional area of the first through-hole is S1; a second through-hole is formed in the negative electrode sheet of the through-hole 1112, 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 charges. By stacking the positive electrode sheet and the negative electrode sheet together, ion transport and charge exchange can be achieved between the positive electrode sheet and the negative electrode sheet, thereby completing the charge and discharge process of the battery 1. A first through-hole is provided on the positive electrode sheet, and a second through-hole is provided on the negative electrode sheet. 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 the same straight line, the first through-hole and the second through-hole can be connected to form the through-hole 1112 on the first side wall 1111. Specifically, the positive electrode sheet, the separator, and the negative electrode sheet are alternately stacked to form the battery cell body 1, and on both sides of the battery cell body 111 in the thickness direction are a positive electrode sheet (or a negative electrode sheet) and a negative electrode sheet respectively. Therefore, the battery cell body 111 has two first side walls 1111 that are spaced apart from each other and opposite to each other in the thickness direction. One first side wall 1111 is the side wall of the positive electrode sheet (or the negative electrode sheet) and forms a first through-hole, and the other first side wall 1111 is the side wall of the negative electrode sheet and forms a second through-hole. The first through-hole and the second through-hole are arranged opposite to each other and connected, so that the battery cell body 111 has a through-hole 1112 that penetrates in the thickness direction, and the two ends of the through-hole 1112 are respectively opened on the two first side walls 1111 of the battery cell body 111. The cross-sectional area S 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 the area of the positive electrode sheet. Therefore, 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 ions on the negative electrode sheet, effectively inhibit the crystallization and precipitation of ions on the negative electrode sheet, and improve the safety and stability of the battery In addition, since the electrochemical reaction of the negative electrode is more complex and more vulnerable to damage than the positive electrode, by increasing the remaining area of the negative electrode sheet, the current density can be dispersed and the service life of the battery 1 can be extended.

[0056] According to some embodiments of the present disclosure, the positive and negative electrode materials of the battery cell 11 may include, but are not limited to, lithium iron phosphate (LiFePO4), lithium manganate (LiMn2O4), lithium cobaltate (LiCoO2), lithium manganese iron phosphate (LiMn x Fe 1-x PO4, 0<x<1), lithium nickel cobalt manganate (LiNi x Co y Mn1-x-y O 2， 0≤x≤1, 0≤x≤1, 0≤x+y≤1), lithium nickel cobalt aluminum oxide (LiNi x Co y Al 1-x-y O 2， One or more of the positive electrode materials such as 0≤x≤1, 0≤x≤1, 0≤x+y≤1) and lithium sulfide (Li2S), 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 can also be a metal foil current collector that initially does not contain negative electrode active material. In this case, the lithium source comes from the positive electrode active material.

[0057] According to some embodiments of the present disclosure, 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, which can ensure that the negative electrode plate can completely cover the positive electrode plate without abnormal charging and discharging or short circuit, while also maximizing the capacity of the positive electrode active material. 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. When the first through hole and the second through hole are connected, it will be smoother, which facilitates the manufacturing process of the battery cell 11. In addition, the cross-sectional change between the first through hole and the second through hole is smoother without obvious mutations, and the stress distribution inside the battery cell 11 will be more uniform, thereby improving the safety and stability of the battery cell 11.

[0058] According to some embodiments of the present disclosure, the battery cell body 111 is provided with a diaphragm located between the positive electrode sheet and the negative electrode sheet, and a third through hole 1112 is formed on the diaphragm. 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. By providing 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, 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 the positive electrode sheet, the diaphragm and the negative electrode sheet are stacked, the electrode core is obtained, and then the diaphragm is opened on the electrode 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), the diaphragm in the electrode core can be easily opened at the second through hole position of the negative electrode sheet, thereby reducing the processing difficulty.

[0059] According to some embodiments of the present disclosure, the cross-sectional shape of the through hole 1112 is configured as a circle or a polygon. The cross-sectional shapes of the through holes 1112 shown in Figures 1 to 6 are all circular. The through hole 1112 with a circular cross-sectional shape can provide a uniform diameter of the through hole 1112. The through hole 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 hole 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 hole 1112 can be simplified, the manufacturing process of the battery cell 11 can be facilitated, and the production efficiency can be improved. 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.

[0060] According to some embodiments of the present disclosure, as shown in Figures 3 to 6, the through holes 1112 are configured as a plurality of through holes 1112 arranged at intervals on the first side wall 1111. 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 column. There are four through holes 1112 on the first side wall 1111 shown in Figures 3 and 4, and there are six through holes 1112 on the first side wall 1111 shown in Figures 5 and 6. 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, the uniformity of the stress distribution can be improved, and the expansion of the battery cell 11 can be further reduced, thereby 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.

[0061] It should be noted here that the through holes 1112 are arranged in a single row and a single column. When the through holes are arranged in a single row, it can be understood that multiple through holes are arranged in sequence in the width direction of the battery cell body 111. When the through holes are arranged in a single column, they are arranged in sequence in the length direction of the battery cell body 111.

[0062] The battery 1 according to the present disclosure will be described below with reference to FIG. 7 to FIG. 11 .

[0063] According to the present disclosure, the battery 1 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 of the above-mentioned 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, providing a stable working environment for the battery cell 11, reducing the loss of substances inside the battery 1, and improving the reliability and stability of the battery 1.

[0064] The battery 1 according to the present disclosure includes the battery cell 11 of any one of the above-mentioned embodiments. Since the battery 1 according to the present disclosure includes the battery cell 11 of any one of the above-mentioned embodiments, the battery 1 according to the present disclosure, because the design of the battery cell 11 takes stress distribution and uniformity into consideration, can reduce the risk of expansion of the battery cell 11 during use, improve the service life and stability, and ensure the energy density of the battery 1.

[0065] According to some embodiments of the present disclosure, the housing 12 can be made of one or more materials selected from metal foils such as aluminum and stainless steel, and their alloys. The housing 12 exhibits excellent electrical conductivity, corrosion resistance, and machinability, meeting the high voltage, high current, and harsh environmental requirements of the battery 1. Furthermore, the metal foil and its alloys can enhance the rigidity and strength of the housing 12, ensuring the safety and stability of the battery 1.

[0066] According to some embodiments of the present disclosure, an injection hole is provided on the housing 12, and the injection hole is connected to the storage chamber. The injection hole is used to inject electrolyte into the storage chamber. During the injection step, the electrolyte is injected into the storage chamber through the injection hole to complete the volume separation process of the battery 1. After the volume separation is completed, the injection hole is sealed to maintain the amount of electrolyte in the storage chamber and prevent electrolyte leakage. By providing the injection hole, the injection of electrolyte and the volume separation process of the battery 1 can be conveniently performed, thereby improving the production efficiency and manufacturing quality of the battery 1.

[0067] According to some embodiments of the present disclosure, a connecting protrusion is provided on the shell 12, which is located in the accommodating cavity and corresponds to the through hole 1112, and the connecting protrusion is accommodated in the through hole 1112. By providing a connecting protrusion on the shell 12, which is located in the accommodating cavity and corresponds to the through hole 1112, and the connecting 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 connecting protrusion match the through hole 1112, so that the connecting 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 suppress the deformation of the shell 12 caused by the expansion of the battery cell 11. The shell 12 is not easily damaged and causes leakage, further enhancing the stability and safety of the battery 1.

[0068] According to some embodiments of the present disclosure, the connecting protrusion is detachably connected to the housing 12. By detachably connecting the connecting protrusion to the housing 12, the battery 1 can be easily assembled, and different battery cells 11 and connecting protrusions can be selected and combined as needed to meet the production of batteries 1 with different specifications and requirements. In particular, one end of the connecting protrusion is accommodated in the through hole 1112, and the other end of the connecting protrusion is detachably connected to the housing. By constructing the end surface area of ​​the other end of the connecting protrusion to be larger than the cross-sectional area S of the through hole 1112, the connecting protrusion will be reliably connected to the housing 12, which can limit the expansion of the electrode.

[0069] According to some embodiments of the present disclosure, the connecting protrusion and the housing 12 are constructed as an integrally formed part. By constructing the connecting protrusion and the housing 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. 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.

[0070] According to some embodiments of the present disclosure, as shown in Figures 7, 8, and 9, the housing 12 includes a first housing 121 and a second housing 122. The first housing 121 and the second housing 122 are connected to define a housing cavity between the first housing 121 and the second housing 122. 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. The second housing 122 is provided with a limiting post 1221 received in the mounting cavity 1212. The limiting post 1221 cooperates with the limiting sleeve 1211 to form a connecting protrusion. By connecting the first housing 121 and the second housing 122, a housing cavity can be defined between the first housing 121 and the second housing 122. The housing cavity is used to accommodate the battery cell 11. By providing a limiting sleeve 1211 extending toward the second housing 122 on the first housing 121, and by providing a limiting post 1221 on the second housing 122, the limiting post 1221 can be accommodated within the mounting cavity 1212 of the limiting sleeve 1211. The matching between the limiting post 1221 and the limiting sleeve 1211 is precise 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 post 1221 achieves a reliable connection and fixation between the battery cell 11 and the housing 12, improving the stability and safety of the battery 1.

[0071] According to some embodiments of the present disclosure, the limiting post 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 using metal materials, 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. The polymer insulating material can be one or more of ethylene (PE), polypropylene (PP), polytetrafluoroethylene (PTFE) and polyimide (PI). The limiting post 1221 and the limiting sleeve 1211 will have excellent insulation performance and mechanical strength, thereby improving the safety and stability of the battery 1.

[0072] According to some embodiments of the present disclosure, as shown in Figures 9, 10, and 11, 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 post 1221 to engage with the first clamping portion 1211a. The first clamping portion 1211a and the second clamping portion 1221a are adapted to restrict the separation of the limiting sleeve 1211 and the limiting post 1221. By providing the first clamping portion 1211a and the second clamping portion 1221a, the limiting sleeve 1211 and the limiting post 1221 can be engaged with each other, effectively restricting the separation of the limiting sleeve 1211 and the limiting post 1221, thereby improving the safety of the battery 1 and further improving the impact resistance of the battery 1, facilitating rapid and accurate assembly and production, reducing production costs, and improving production efficiency.

[0073] According to some embodiments of the present disclosure, 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.

[0074] According to some embodiments of the present disclosure, the adhesive layer can be made of one or more materials selected from epoxy resins, acrylates, polyurethanes, polyimides, and phenolic resins. The adhesive layer has excellent bonding, high-temperature resistance, and insulation properties, and can fill, bond, and protect the connection between the limiting sleeve 1211 and the limiting post 1221, further improving the safety and stability of the battery 1.

[0075] According to some embodiments of the present disclosure, 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 on the outer 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 post 1221 is provided on the second bottom plate 122a; the second side plate 122b is provided 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 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 achieve a 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, thereby facilitating the manufacturing and assembly process of the battery 1 and improving production efficiency. Furthermore, sealing the first side plate 121b and the second side plate 122b can achieve sealing of the accommodating cavity, making sealing of the accommodating cavity more convenient and reliable. Furthermore, by providing a limiting sleeve 1211 on the first bottom plate 121a and a limiting post 1221 on the second bottom plate 122a, the limiting post 1221 precisely mates with the limiting sleeve 1211, allowing the battery cell 11 to be precisely fixed within the accommodating cavity.

[0076] The housing assembly according to the present disclosure is briefly described below.

[0077] The shell assembly according to the present disclosure is used for the battery 1 in any of the above-mentioned embodiments. The shell assembly includes: a shell 12, wherein a cavity is formed in the shell for accommodating the battery cell 11; and a connecting protrusion, which is disposed on the shell 12 and received in the cavity, and is adapted to be penetrated by a through-hole. Since the shell assembly according to the present disclosure is used for the battery 1 in any of the above-mentioned embodiments, the shell assembly according to the present disclosure can cooperate with the through-hole 1112 on the battery cell through the connecting protrusion provided on the shell 12, so that the battery cell 11 can be more reliably fixed in the cavity, thereby improving the reliability and safety of the battery 1.

[0078] The following briefly describes the electric device according to the present disclosure.

[0079] The electrical device according to the present disclosure includes the battery 1 of any one of the above-mentioned embodiments. Since the electrical device according to the present disclosure includes the battery 1 of any one of the above-mentioned embodiments, the electrical device according to the present disclosure has high stability and high safety, and can maintain stable performance under different environments and conditions. Due to the high safety and long service life of the battery 1, it can meet the needs of long-term use.

[0080] An experimental method is provided below to verify the electrochemical cycle performance of the battery 1 according to an embodiment of the present disclosure.

[0081] Experimental preparation:

[0082] Standard positive electrode sheet preparation: The positive electrode active material (LiNi 0.70 Co 0.10 Mn 0.20 48.5 g of 1,000 g of acetylene black (O2), 1.0 g of a conductive agent (acetylene black), and 0.5 g of a binder (polyvinylidene fluoride, PVDF) were mixed in N-methylpyrrolidone (NMP) to form a stable and uniform slurry, wherein the stirring speed of the vacuum mixer was 1000 rpm and the stirring time was 12 h; the obtained slurry was then coated on the current collector aluminum sheet, and the surface density was controlled to be 395 g / m 2 , then dried at 80℃ and rolled by a roller press to obtain a standard positive electrode sheet.

[0083] 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.

[0084] Example 1 (battery cell 11 has only one through hole 1112)

[0085] Production of battery cell 11: Take a standard positive electrode sheet and die-cut it using a specific positive electrode die-cutting mold. Die-cut a positive electrode sheet with only one through-hole 1112. The dressing area measures 270×90mm. The cross-sectional shape of through-hole 1112 is circular. Through-hole 1112 is located in the center of the positive electrode sheet dressing area. The radius of through-hole 1112 is 10.5mm. Take a standard negative electrode sheet (8-micron thick copper foil) and die-cut it using a specific negative electrode die-cutting mold. Die-cut a negative electrode sheet with only one through-hole 1112. Excluding the tab area, the dimension is 274×94mm. The cross-sectional shape of through-hole 1112 is circular. Through-hole 1112 is located in the center of the electrode sheet dressing area. The radius of through-hole 1112 is 9.0mm. The die-cut positive electrode sheet, negative electrode sheet, and separator are stacked in a Z-shape, with 9 positive electrode layers, 10 negative electrode layers, and 20 separator layers. The stacked battery cell 11 is hot pressed at 80°C for 3 minutes, and then a hole opener is used to open the entire battery cell 11 at the through hole 1112 of the negative electrode plate. The radius of the through hole 1112 is 8.4 mm (that is, the radius of the hole on the diaphragm).

[0086] Battery 1 production: A limiting sleeve 1211 is provided on the first shell 121 of the battery 1, and a limiting post 1221 is provided on the second shell 122 of the battery 1. The outer radius of the limiting sleeve 1211 on the first shell 121 is 8.0 mm. The limiting sleeve 1211 cooperates with the limiting post 1221 and fastens the first shell 121 and the second shell 122 together. To further ensure the sealing of the battery 1, laser welding is used to weld and seal the first shell 121 and the second shell 122. Finally, the assembled battery 1 is baked at 80°C, and the resulting unfilled battery is S1.

[0087] Example 2:

[0088] The difference from Example 1 is that two through holes 1112 are provided on the battery cell body 111, and the two through holes 1112 are of the same size. The dressing area of ​​the positive electrode sheet is 270×90mm, the cross-section of the through hole 1112 is circular, and the radius of the through hole 1112 is 20mm. A standard negative electrode sheet (the negative electrode active material is nano-silicon, and the mass percentage of silicon is 95%) is die-cut using a specific negative electrode die-cutting mold to die-cut a negative electrode sheet with two through holes 1112. Excluding the tab area, the size is 274×94mm, and the radius of the through hole 1112 is 18mm. The die-cut positive and negative electrode sheets and diaphragms are stacked in a Z-shape; the opening radius of the diaphragm is 16mm; and the outer radius of each corresponding upper limit sleeve 1211 of the first shell 121 is 15.0mm. The resulting unfilled battery is S2.

[0089] Example 3:

[0090] The difference from Example 1 is that the radius of the through hole 1112 on the positive electrode sheet is 36.4 mm, and the radius of the through hole 1112 on the negative electrode sheet is 33 mm; the opening radius of the diaphragm is 32 mm; and at the same time, the outer radius of the upper limit sleeve 1211 on the first shell 121 is 30.0 mm. The resulting unfilled battery is S3.

[0091] Example 4:

[0092] 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 radius of the diaphragm is 26 mm; and at the same time, the outer radius of the upper limit sleeve 1211 on the first shell 121 is 24.0 mm. The resulting unfilled battery is S4.

[0093] Comparative Example 1

[0094] No through-holes are provided in the positive electrode sheet and the negative electrode sheet (8-micron thick copper foil), and no through-holes are provided in the battery cells after lamination. No connecting protrusions are provided in the accommodating cavity of the shell. Other process steps remain consistent, and the resulting unfilled battery is DS1.

[0095] Comparative Example 2

[0096] 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 radius of the diaphragm is 2.5 mm; and the outer radius of the upper limit sleeve on the first shell is 2.0 mm. The resulting unfilled battery is DS2.

[0097] Comparative Example 3

[0098] The difference from Example 2 is that: the number of through holes is 4, the radius of the through holes on the positive electrode sheet is 20.0 mm; the radius of the through holes on the negative electrode sheet is 18.0 mm; the opening radius of the diaphragm is 16.0 mm; at the same time, the outer radius of the upper limit sleeve 1211 on the first shell 121 is 20.0 mm, and the resulting unfilled battery is DS3.

[0099] Test methods and results:

[0100] The battery 1 obtained in the embodiment of the present disclosure and the control experiment was subjected to an electrochemical cycle test to evaluate the cycle performance of the battery 1 .

[0101] The test conditions are as follows: the electrolyte is 1 wt% LiNO3 dissolved in ethylene glycol dimethyl ether (DME) containing 4 M / L-LiFSI, and the test temperature is 25°C.

[0102] The test steps are as follows:

[0103] Energy density test: Battery 1 was subjected to a charge-discharge cycle test at a 0.2C rate. The test steps included resting the battery for 10 minutes, then charging it at a constant current of 0.2C to 4.3V, then charging it at a constant voltage of 4.3V / 0.05C to a cutoff, resting it for another 10 minutes, and finally discharging it at 0.5C to 3.0V. The resulting capacity was the actual discharge capacity of the battery. Battery volumetric energy density = actual discharge capacity * average discharge voltage / battery volume, as shown in Table 1.

[0104] Cycle: The battery was charged and discharged at a rate of 0.2C. The steps included setting the battery aside for 10 minutes, then charging battery 1 at a constant current of 0.2C to 4.3V, then charging it at a constant voltage to 4.3V / 0.05C cut-off, setting the battery aside for another 10 minutes, and finally discharging battery 1 at 0.5C to 3.6V to complete one cycle.

[0105] Repeat the above steps until the capacity of Battery 1 falls below 80% of its initial discharge capacity. The number of cycles is the cycle life of Battery 1. Two batteries were used in Example 1 and Comparative Example 1, and specific experimental data is shown in Figure 12, which compares the battery cycle performance data for Example 1 and Comparative Example 1. Capacity retention refers to the ratio of the actual capacity to the initial capacity of a battery during use, reflecting the degree of performance degradation during use. Cycle life refers to the number of times a battery can maintain normal operation after multiple charge and discharge cycles.

[0106] As shown in Figure 12, after the battery of Example 1 and the battery of Comparative Example 1 have each 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 experiences less performance degradation during use than the battery of Comparative Example 1, and has better battery stability and service life. Furthermore, the battery of Comparative Example 1 maintains a capacity retention rate of over 95% for approximately 50 cycles, while the battery of Example 1 maintains a capacity retention rate of over 95% for approximately 200 cycles, indicating that the battery of Example 1 has a significantly improved cycle life compared to the battery of Comparative Example 1. Furthermore, Figure 12 also shows that the capacity retention rate of the battery of Comparative Example 1 begins to decline rapidly after approximately 50 cycles, while the capacity retention rate of the battery of Example 1 begins to decline significantly after approximately 200 cycles, further demonstrating the superiority of the battery of Example 1 in cycle life.

[0107] The thickness of the shell corresponding to the large surface of the battery before and after the cycle was measured using 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.

[0108] From the comparison of the battery cycle performance data of batteries S1-S4 of Examples 1-4 and batteries DS1-DS3 of Comparative Examples 1-3, it can be seen that batteries S1-S4 are provided with through holes 1112, which greatly improves the cycle life of battery S1 and significantly reduces the battery thickness change rate, indicating that the setting of through holes 1112 has a positive impact 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.

[0109] Table 1

[0110] It can be concluded that the battery 1 (S1, S2, S3 and S4) obtained using the embodiment of the present disclosure has higher comprehensive performance in cycle life, volume energy density and battery volume expansion than the batteries (DS1, DS2 and DS3) obtained in the control experiment, indicating that the structure of battery 1 is more stable and the energy density of the battery is within an appropriate range.

[0111] In the description of the present disclosure, 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 disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present disclosure.

[0112] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the present disclosure, "plurality" means more than two, unless otherwise specifically defined.

[0113] In this disclosure, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in this disclosure based on specific circumstances.

[0114] In the present disclosure, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0115] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", 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 disclosure. In this specification, the schematic representations of the above terms do 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. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and features of different embodiments or examples, unless they are mutually inconsistent.

[0116] Although the embodiments of the present disclosure have been shown and described above, it is understood that the above embodiments are illustrative and are not to be construed as limitations on the present disclosure. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present disclosure.

Claims

1. A battery cell, characterized in that, Including: The battery cell body (111), the battery cell body (111) has a first side wall (1111) in the thickness direction, and n through holes (1112) are provided on the first side wall (1111); where The area of the first side wall (1111) is S0, the cross-sectional area of the through hole (1112) is S, and it satisfies: 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 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 or 2, characterized in that, The battery cell body (111) is formed by stacking a positive electrode plate and a negative electrode plate; The through hole (1112) forms 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; where 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, 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.

5. The battery cell according to claim 3 or 4, characterized in that, The battery cell body (111) is provided with a separator located between the positive electrode plate and the negative electrode plate. The through hole (1112) forms a third through hole on the separator. 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.

6. The battery cell according to any one of claims 1-5, characterized in that, The cross-sectional shape of the through hole (1112) is configured as a circle or a polygon.

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

8. A battery, characterized in that, Including: A housing (12), an accommodation cavity adapted to accommodate the battery cell (11) is formed in the housing (12); A battery cell (11), the battery cell (11) is configured as the battery cell (11) described in any one of claims 1-7, and the battery cell (11) is received in the accommodation cavity.

9. The battery according to claim 8, characterized in that, A connecting convex portion located in the accommodation cavity and corresponding to the through hole (1112) is provided on the housing (12), and the connecting convex portion is received in the through hole (1112).

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

11. The battery according to claim 9 or 10, characterized in that, The housing (12) includes: A first housing (121) and a second housing (122), the first housing (121) and the second housing (122) are connected to define the accommodation cavity between the first housing (121) and the second housing (122); where A limiting sleeve (1211) extending towards the second housing (122) is provided on the first housing (121), and an installation cavity (1212) is formed inside the limiting sleeve (1211); a limiting post (1221) received inside the installation cavity (1212) is provided on the second housing (122), and the limiting post (1221) and the limiting sleeve (1211) are cooperated to be configured as the connecting convex part.

12. The battery according to claim 11, wherein A first clamping part (1211a) is provided on the inner wall of the limiting sleeve (1211), and a second clamping part (1221a) engaged with the first clamping part (1211a) is formed on the outer periphery of the limiting post (1221), and the first clamping part (1211a) and the second clamping part (1221a) are adapted to limit the limiting sleeve (1211) and the limiting post (1221) from separating from each other.

13. The battery according to claim 12, wherein, Further comprising: An adhesive layer provided between the inner wall of the limiting sleeve (1211) and the outer surface of the limiting post (1221).

14. The battery according to any one of claims 11-13, characterized in that, The first housing (121) comprises: A first bottom plate (121a) with the limiting sleeve (1211) provided thereon; A first side plate (121b) provided on the outer periphery of the first bottom plate (121a); The second housing (122) comprises: A second bottom plate (122a) with the limiting post (1221) provided thereon; A second side plate (122b) provided 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 accommodation cavity between the first bottom plate (121a) and the second bottom plate (122a).

15. A housing assembly for the battery cell according to any one of claims 1-7, characterized in that, Comprising: A housing (12) with an accommodation cavity formed inside for accommodating an electric core (11); A connecting convex part provided on the housing and received inside the accommodation cavity, and the connecting convex part is adapted to penetrate through the through hole (1112).

16. An electrical device, characterized in that, Comprising the battery (1) according to any one of claims 8-14.

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