Battery monomer, battery and electric device

Abstract

The invention discloses a battery monomer, a battery and a power utilization device. The battery cell includes: a case; a cell assembly; the bracket is arranged at one end of the battery cell assembly; the insulating part is matched with the bracket and wraps the battery core assembly; wherein the battery core assembly, the bracket and the insulating part are all arranged in the shell, and at least one part of the insulating part is connected with the wall surface, far away from the battery core assembly, of the bracket. According to the technical scheme provided by the embodiment of the invention, the connection reliability between the insulating part and the bracket can be improved, and the risk that the insulating part falls off can be reduced, so that the risk that the shell is corroded due to naked leakage of the battery core assembly can be reduced, the risk that the battery core assembly fails can be reduced, and the risk of liquid leakage can be reduced; and the reliability and the stability of the battery monomer can be improved.

Description

Battery cells, batteries and electrical devices Technical Field

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

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become a crucial component of this sustainable development. Battery technology is a crucial factor in the development of electric vehicles. However, the reliability of battery cells remains a challenge, hindering further improvements in battery reliability.

[0003] Summary of the Invention

[0004] In view of the above problems, the present application provides a battery cell, a battery and an electrical device with higher reliability.

[0005] In the first aspect, the present application provides a battery cell, comprising: a shell; a battery cell assembly; a bracket, arranged at one end of the battery cell assembly; an insulating member, cooperating with the bracket and covering the battery cell assembly; wherein the battery cell assembly, the bracket and the insulating member are all arranged in the shell, and at least a portion of the insulating member is connected to the wall of the bracket away from the battery cell assembly.

[0006] In the technical solution of the embodiment of the present application, by connecting at least a portion of the insulating part to the wall of the bracket away from the battery cell assembly, on the one hand, in the process of installing the battery cell assembly with the bracket into the shell, the shell is not easy to scratch the connection position between the insulating part and the bracket, and the connection position between the insulating part and the bracket is not easy to be pulled apart during the shell insertion process, which can reduce the movement and slippage of the insulating part during the shell insertion process of the battery cell assembly, improve the connection reliability between the insulating part and the bracket, reduce the risk of the insulating part falling off, thereby reducing the risk of the shell being corroded due to the exposure of the battery cell assembly, reduce the risk of the battery cell assembly itself failing, and reduce the risk of leakage, thereby improving the reliability and stability of the battery single body; at the same time, compared with the connection between the insulating part and the peripheral side of the battery cell assembly, the insulating part is matched with the bracket, so that the insulating part originally Multiple surfaces on the circumference of the shell are adjacent, which greatly reduces the probability of interference between the matching position of the insulating part and the bracket due to being adjacent to a surface at one end of the shell, can further improve the reliability and stability of the insulating part, and can improve the reliability and stability of the battery cell; in addition, by connecting at least a part of the insulating part to the wall of the bracket away from the battery cell assembly, the size of the insulating part can be designed to be longer, which can be suitable for battery cell assemblies of different sizes, has higher compatibility, and can improve manufacturability; on the other hand, after the bracket and battery cell assembly are installed in place in the shell, the insulating part is pressed between the wall of the shell opposite to the opening and the bracket, which can further reduce the risk of the insulating part falling off, reduce the risk of the battery cell assembly failing due to leakage, and at the same time reduce the risk of the shell being corroded, thereby improving the reliability and stability of the battery cell.

[0007] In some embodiments, the insulating part and the bracket are connected in a continuous annular manner or in an annular interval manner in the circumferential direction away from the wall surface of the battery cell assembly, which can increase the connection area between the insulating part and the bracket, so as to improve the connection reliability and stability between the insulating part and the bracket in the circumferential direction of the bracket, further reduce the risk of the insulating part falling off, and thereby improve the reliability of the battery cell assembly entering the shell, thereby ensuring the reliability and stability of the battery cell.

[0008] In some embodiments, the insulating part and the bracket are connected by hot-melt connection away from the wall surface of the battery cell assembly to form a connection mark; the connection mark extends in a circumferential ring around the wall surface; or, there are multiple connection marks, and the multiple connection marks are arranged at circumferential intervals around the wall surface. In the above technical solution, on the one hand, the use of hot-melt connection can facilitate the cooperation between the insulating part and the bracket, improve the assembly efficiency, so as to ensure the efficiency of the battery cell assembly into the shell, and save the cost of assembly and manufacturing; on the other hand, whether the connection mark extends in a circumferential ring or is arranged at circumferential intervals, it can improve the firmness of the connection between the insulating part and the bracket, improve the reliability and stability of the connection between the insulating part and the bracket, so as to fully reduce the risk of the insulating part falling off; at the same time, compared with the circumferential ring extension, the circumferential interval arrangement can also save materials and reduce costs on the basis of ensuring the reliability of the connection between the insulating part and the bracket.

[0009] In some embodiments, a pole is provided on the shell; the battery cell assembly includes an active material coating portion and a conductive portion, the conductive portion is connected to the side of the active material coating portion close to the bracket, and extends toward the pole and is connected to the pole, and the insulating member and the bracket jointly cover the circumference of the active material coating portion. In the above technical solution, by having the insulating member and the bracket jointly cover the circumference of the active material coating portion, on the one hand, the active material coating portion can be completely separated from the shell, reducing the exposure of the active material coating portion, reducing the risk of failure and damage of the battery cell assembly, and improving the reliability and stability of the battery cell; on the other hand, the size of the insulating member can be reduced, saving the cost of the insulating member; at the same time, the insulating member can be stabilized and protected by the bracket to fully ensure the reliability and stability of the battery cell.

[0010] In some embodiments, the insulating member includes a main insulating portion, a first insulating portion, and a second insulating portion. The main insulating portion is wrapped around the circumference of the active material coating portion. The first insulating portion and the second insulating portion are respectively arranged at both ends of the main insulating portion. The first insulating portion is located on the side of the main insulating portion away from the bracket and wrapped around the end of the active material coating portion away from the bracket. The second insulating portion is located on the side of the main insulating portion close to the bracket and is used to cooperate with the bracket and jointly cover the end of the active material coating portion close to the bracket. The insulating member is composed of multiple parts, and the multiple parts can jointly cover the sides, bottom, and top of the active material coating portion with the bracket, and can completely separate the active material coating portion from the shell, so as to fully reduce the exposure of the active material coating portion, reduce the risk of failure and damage of the battery cell assembly, reduce the risk of corrosion of the shell, and improve the reliability and stability of the battery cell.

[0011] In some embodiments, the main body insulating portion includes multiple main portions connected end-to-end to form a ring. The multiple main portions collectively wrap around the periphery of the active material coating portion, and the first insulating portion and the second insulating portion are located at either end of the ring structure formed by the multiple main portions. The connected ring-shaped multiple main portions completely wrap around the periphery of the active material coating portion, completely isolating the periphery of the active material coating portion from the inner wall of the housing, reducing the risk of leakage from the active material coating portion and improving the reliability and stability of the battery cell.

[0012] In some embodiments, the connection locations of any two adjacent main bodies partially overlap. In the above technical solution, on the one hand, the overlapping connection locations of the main bodies make the connection locations less likely to separate or disconnect, which can reduce the probability and risk of insulation failure at the overlapping locations of the two, improve the reliability of the battery cell assembly, and thus improve the stability and reliability of the battery cell; on the other hand, the overlapping connection locations of the main bodies can fully ensure that the entire insulating member can be wrapped around the circumference of the active material coating portion, fully reduce the exposure of the active material coating portion, reduce the risk of corrosion of the shell, and further improve the reliability and stability of the battery cell assembly and battery cell.

[0013] In some embodiments, the peripheral side of the active material coating portion has multiple surfaces; each main body portion includes a main body surface and two flanges provided on both sides of the main body surface; any two adjacent main bodies are connected by flanges, and the connection structure of each main body surface and each two flanges respectively wraps different surfaces of the peripheral side of the active material coating portion. In the above technical solution, on the one hand, the connection of any two adjacent main bodies by flanges can ensure the reliability of the connection, thereby improving the reliability and stability of the battery cell assembly and the battery cell; on the other hand, the main body surface and the connection position of each two flanges respectively wrap one surface of the peripheral side of the active material coating portion, so that each surface of the peripheral side of the active material coating portion can be effectively wrapped, which can further improve the reliability of the battery cell assembly and improve the stability and reliability of the battery cell.

[0014] In some embodiments, the active material coating portion has four sides; the main insulating portion includes two main portions, namely a first main portion and a second main portion, disposed on either side of the first insulating portion. The first main portion includes a first main surface and a first flange and a second flange disposed on either side of the first main surface. The second main portion includes a second main surface and a third flange and a fourth flange disposed on either side of the second main surface. The first flange and the third flange are connected, and the second flange and the fourth flange are connected. The first main surface, the first flange, and the third flange are connected, and the second flange and the fourth flange are connected. The connecting structure of the first main surface, the first flange, and the third flange, and the connecting structure of the second main surface, the second flange, and the fourth flange respectively wrap around the four sides of the active material coating portion. When the active material coating portion has four sides, the battery cell is generally square. In this case, the first main portion and the second main portion, as well as their connecting structure, can completely cover the four sides of the active material coating portion, completely separating the four sides of the active material coating portion from the inner wall of the housing, reducing the risk of leakage of the active material coating portion, and substantially improving the reliability and stability of the square battery cell.

[0015] In some embodiments, the first insulating portion has a centerline, and the first main portion and the second main portion are located on either side of the centerline of the first insulating portion, respectively. With the centerline as the axis of symmetry, the first and second main portions are symmetrically arranged, or the first and second main faces are symmetrically arranged. When the two main portions are completely symmetrical, this facilitates mold opening and manufacturing of the insulating component, saving costs and improving production efficiency. When the two main faces are symmetrically arranged, the flanges of the two main portions can be asymmetrically arranged. In this case, the flange of one main portion can be set longer, while the flange of the adjacent main portion can be set shorter, so that when the two main portions are connected, the longer flange can wrap around the shorter flange. This can reduce the risk of leakage of the active material coating portion and the risk of corrosion of the shell while saving costs, thereby fully improving the reliability and stability of the square battery cell.

[0016] In some embodiments, the second insulating portion includes multiple insulating sub-portions, which are connected to the multiple main portions in a one-to-one correspondence; any two adjacent insulating sub-portions have partial overlap, effectively reducing the phenomenon of the active material coating portion corroding the shell due to leakage.

[0017] In some embodiments, each insulating subsection includes a main surface and two subsurfaces. The main surface is connected to the main surface of the corresponding main body, and the two subsurfaces are respectively connected to the two flanges of the corresponding main body. The two subsurfaces corresponding to any two adjacent flanges are connected, and each subsurface is connected to the adjacent main surface. The arrangement of the main surface and subsurfaces facilitates the application of the insulating member to the outside of the battery cell assembly, ensuring manufacturing and assembly efficiency and reducing manufacturing and assembly costs.

[0018] In some embodiments, the two facets corresponding to any two adjacent flanges partially overlap; and / or each facet partially overlaps the adjacent main surface. Whether the two facets overlap or the facet overlaps the adjacent main surface, this fully ensures that the entire insulating member and the bracket can be securely fitted together, allowing the entire insulating member and bracket to fit and wrap around the circumference of the active material coating, effectively minimizing exposure of the active material coating, reducing the risk of casing corrosion, and improving the stability and reliability of the battery cell.

[0019] In some embodiments, the connection between the main body insulating portion and the first insulating portion is notched; and / or the connection between the main body insulating portion and the second insulating portion is notched. In the above technical solution, on the one hand, this arrangement facilitates folding of the insulating member to smoothly wrap the active material coating portion, which is conducive to improving production and manufacturing efficiency and saving production and manufacturing costs. On the other hand, this arrangement can reduce errors in the process of wrapping the insulating member around the active material coating portion, which can improve the accuracy and reliability of the wrapping of the insulating member and the bracket, thereby further improving the stability and reliability of the battery cell.

[0020] In some embodiments, the housing is provided with a terminal post; the battery cell assembly includes an active material coating portion and a conductive portion, the conductive portion being connected to a side of the active material coating portion proximal to the bracket, and the bracket having a via through which the conductive portion passes to connect to the terminal post. On the one hand, the via provided in the bracket allows the bracket to contain and accommodate the conductive portion, facilitating the connection between the conductive portion and the terminal post, thereby improving the reliability and convenience of battery cell assembly. On the other hand, the bracket's containment of the conductive portion eliminates the need for plastic components in the battery cell. The bracket and insulating member cooperate to provide insulation between the entire battery cell assembly and the housing, effectively reducing manufacturing and production costs.

[0021] In some embodiments, the bracket is a one-piece structure; alternatively, the bracket is a split structure comprising a first bracket and a second bracket that are separately formed, with a via defined between the first bracket and the second bracket. Providing a one-piece bracket structure not only reduces the number of components, eliminates intermediate connectors, reduces costs, and improves the bracket's structural strength, but also simplifies the assembly process, facilitating improved production efficiency. Providing a bracket comprising a first bracket and a second bracket that are separately formed facilitates assembly of the bracket with the battery cell assembly.

[0022] In some embodiments, a side of the bracket facing away from the active material coating portion is provided with a receiving groove connected to the via hole, and the receiving groove accommodates at least a portion of the terminal. In the above technical solution, on the one hand, by accommodating at least a portion of the terminal in the receiving groove, the structure of the entire battery cell is made more compact and reliable, which is conducive to achieving an increase in the energy density of the entire battery. On the other hand, the provision of the receiving groove can also achieve insulation between the terminal and a portion of the housing through the bracket, further improving the stability and reliability of the battery cell. In addition, by accommodating the terminal in the receiving groove, the stability and reliability of the terminal can be improved, thereby ensuring the stability and reliability of the battery cell during the charging and discharging process.

[0023] In some embodiments, a guide portion is provided on the side of the bracket facing away from the active material coating. The guide portion is circumferentially disposed around the via and extends toward the terminal. The guide portion can restrain, gather, and support the conductive portion, facilitating connection between the conductive portion and the terminal, thereby improving the efficiency and quality of battery cell assembly.

[0024] In some embodiments, a receiving portion is provided on the pole, at least a portion of the conductive portion is received in the receiving portion, and at least a portion of the guide portion extends into the receiving portion to guide the conductive portion to be received in the receiving portion. In the above technical solution, on the one hand, by setting the pole as a hollow structure and coordinating the guide portion with the hollow structure, the conductive portion can be guided to connect with the pole, which can improve the connection reliability and ensure the assembly efficiency and quality; on the other hand, the conductive portion can be received in the receiving portion, which improves the assembly efficiency of the conductive portion, saves the space occupied by the conductive portion, and makes full use of the space of the battery cell, so that the cooperation between the bracket and the pole, and between the bracket and the conductive portion are tighter and more reliable, making the structure of the battery cell more compact, which is more conducive to improving the energy density of the battery cell.

[0025] In some embodiments, a guide groove connected to the via is formed on the side of the bracket facing the active material coating. The guide groove accommodates at least a portion of the conductive portion, and the cross-sectional area of ​​the guide groove gradually increases as the bracket approaches the active material coating. The guide groove not only accommodates the conductive portion but also provides a clearance to avoid crushing it. It also reduces the likelihood of the conductive portion becoming puffy or folded, thereby reducing redundancy.

[0026] In some embodiments, the bracket includes at least one first liquid injection guide groove, located on the side of the bracket facing the active material coating portion; at least one first liquid injection guide groove communicates with the guide groove. The first liquid injection guide groove can increase electrolyte fluidity, improve injection speed, and reduce formation standstill time. The electrolyte can flow along the first liquid injection guide groove toward the guide groove, allowing the electrolyte to flow to a predetermined location. This increases the contact area between the electrolyte and the active material coating portion, thereby reducing the problem of poor wetting of the active material coating portion.

[0027] In some embodiments, the bracket includes a first liquid injection channel located on a side of the bracket closer to the battery cell assembly; and / or a second liquid injection channel located on a side of the bracket facing away from the battery cell assembly. The first and second liquid injection channels can increase electrolyte fluidity, improve injection speed, and reduce formation standstill time.

[0028] In some embodiments, a side of the bracket facing the battery cell assembly has a clearance portion for avoiding the outer edge of the battery cell assembly facing the bracket, thereby reducing the risk of the bracket crushing the battery cell assembly.

[0029] In some embodiments, a retaining protrusion is provided on one side of the bracket, which engages with the battery cell assembly. The retaining protrusion can restrain one end of the battery cell assembly, reducing the possibility of the outer layer of the battery cell assembly becoming fluffy. It also protects the one end of the battery cell assembly, reducing the problem of the one end of the battery cell assembly contacting the housing, thereby reducing the possibility of the housing scratching the battery cell assembly during the insertion process.

[0030] In some embodiments, a terminal is provided on the housing; the battery cell assembly includes an active material coating portion and a conductive portion, the conductive portion being connected to a side of the active material coating portion near the bracket; a receiving portion is provided on the terminal, at least a portion of the conductive portion is received within the receiving portion and connected to the terminal. By receiving at least a portion of the conductive portion within the receiving portion, the space occupied by the battery cell itself can be reduced, allowing a battery of the same volume to accommodate a greater number of battery cells and improving the volumetric energy density of the battery; in addition, by receiving at least a portion of the conductive portion within the receiving portion to occupy space within the terminal, the redundancy of the conductive portion within the housing can be reduced to at least a certain extent, reducing the probability of short circuit between the conductive portion and the active material coating portion, reducing the probability of short circuit in the battery cell, and improving the operating reliability and stability of the battery cell and the battery.

[0031] In some embodiments, the accommodating portion has a first accommodating groove, the surface of the pole facing the active material coating portion is the inner end face of the pole, the notch of the first accommodating groove is formed on the inner end face of the pole, and at least part of the conductive portion is accommodated in the first accommodating groove.

[0032] In the above technical solution, on the one hand, the first receiving groove in the terminal can reduce the weight of the terminal to a certain extent, thereby improving the weight energy density of the battery cell and the battery. On the other hand, because the notch of the first receiving groove is formed on the inner end surface of the terminal, and the inner end surface of the terminal is the surface of the terminal near the active material coating portion, the first receiving groove can be opened toward the active material coating portion, thereby facilitating the insertion of the conductive portion into the first receiving groove and improving assembly efficiency. Moreover, this type of first receiving groove is easy to process and improves production efficiency.

[0033] In some embodiments, the receiving portion includes a second receiving groove, wherein the surface of the terminal distal to the active material coating portion is the terminal outer end surface, and a notch of the second receiving groove is formed on the terminal outer end surface. The second receiving groove communicates with the interior of the housing via a through-hole, and the conductive portion is passed through the through-hole and at least partially received within the second receiving groove. In the above technical solution, on the one hand, the provision of the second receiving groove on the terminal can reduce the weight of the terminal to a certain extent, thereby improving the weight energy density of the battery cell and the battery. On the other hand, because the notch of the second receiving groove is formed on the terminal outer end surface, which is the surface of the terminal distal to the active material coating portion, the second receiving groove can be open in a direction away from the active material coating portion. Thus, when at least a portion of the conductive portion is received within the second receiving groove, the conductive portion can be easily stored and organized through the notch of the second receiving groove, and electrical connection operations between the conductive portion and the terminal can be easily performed through the notch of the second receiving groove, thereby reducing the difficulty of battery cell production and improving battery cell production efficiency.

[0034] In some embodiments, the housing includes a body and a cover. The body has one opening, the cover covers the opening, and the bracket is located at the end of the cell assembly away from the opening. Alternatively, there are two openings, each of which is covered by a cover, and the bracket is located at the end of the cell assembly away from either opening. A portion of the insulating member can be compressed between a wall of the body opposite one of the openings and the corresponding bracket, while another portion of the insulating member can be compressed between a wall of the body opposite the other opening and the corresponding bracket. This further reduces the risk of the insulating member falling off, reduces the risk of cell assembly failure due to leakage, and reduces the risk of corrosion of the housing, thereby improving the reliability and stability of the battery cells.

[0035] In the above technical solution, an opening is provided on the shell body, and the bracket is provided at an end of the battery cell assembly away from the opening. The battery cell assembly with the bracket and the insulating part can only be installed into the shell body from the opening. The shell entry direction is unique, which is conducive to improving installation efficiency. The shell body will not scratch the edge of the insulating part, nor will it scratch the connection position between the insulating part and the bracket. The connection reliability between the insulating part and the bracket can be improved, and the risk of the insulating part falling off can be reduced. In addition, the risk of the shell being corroded due to leakage of the battery cell assembly can be reduced, the risk of failure of the battery cell assembly itself can be reduced, and the risk of leakage can be reduced, thereby improving the reliability and stability of the battery cell. Two openings are provided on the shell body, and a bracket is provided at one end of the battery cell assembly away from any one of the openings. The battery cell assembly with two brackets and insulating parts can be loaded into the shell body from any one of the openings, and the appropriate shell insertion direction can be selected as needed. After the battery cell assembly is installed in place in the shell body, a part of the insulating part can be pressed between the wall of the shell body opposite to one of the openings and the corresponding bracket, and the other part of the insulating part can be pressed between the wall of the shell body opposite to the other opening and the corresponding bracket, thereby further reducing the risk of the insulating part falling off, reducing the risk of the battery cell assembly failing due to leakage, and at the same time reducing the risk of the shell being corroded, thereby improving the reliability and stability of the battery cell.

[0036] In some embodiments, at least one terminal is disposed on the housing wall adjacent to the bracket. In the above technical solution, the battery cell assembly with the bracket and insulator enters the housing through the opening, with the conductive portion directly facing the terminal. This allows for easier connection between the conductive portion and the terminal, improving battery cell assembly efficiency.

[0037] In a second aspect, the present application provides a battery comprising the battery cell in the above embodiment.

[0038] In the above technical solution, since the battery is provided with the above-mentioned battery cell, and since at least a portion of the insulating part is connected to the wall of the bracket away from the battery cell assembly, the connection reliability between the insulating part and the bracket can be improved, and the risk of the insulating part falling off can be reduced, thereby reducing the risk of the shell being corroded due to leakage of the battery cell assembly, reducing the risk of failure of the battery cell assembly itself, and reducing the risk of leakage, thereby improving the reliability and stability of the battery.

[0039] In a third aspect, the present application provides an electrical device comprising the battery in the above embodiment.

[0040] In the above technical solution, since the electric device is provided with the above-mentioned battery, the working reliability and stability of the battery can be improved, and thus the working reliability and stability of the electric device can be improved.

[0041] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0043] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0044] FIG2 is an exploded view of the structure of a battery provided in some embodiments of the present application;

[0045] FIG3 is a battery provided by some embodiments of the present application;

[0046] FIG4 is a cross-sectional view of the structure of a battery cell according to some embodiments of the present application;

[0047] FIG5 is a cross-sectional view of the structure of a battery cell assembly, a bracket, and an insulating member after assembly in some embodiments of the present application;

[0048] FIG6 is an assembly diagram of a battery cell according to some embodiments of the present application;

[0049] FIG7 is an assembly diagram of battery cells according to other embodiments of the present application;

[0050] FIG8 is a top view of a battery cell according to some embodiments of the present application;

[0051] FIG9 is a top view of a battery cell according to some other embodiments of the present application;

[0052] FIG10 is a top view of a battery cell according to some other embodiments of the present application;

[0053] FIG11 is a schematic structural diagram of an insulating member of a battery cell in some embodiments of the present application in an unfolded state;

[0054] FIG12 is a schematic structural diagram of an insulating member of a battery cell in another embodiment of the present application in an unfolded state;

[0055] FIG13 is a schematic structural diagram of an insulating member of a battery cell in an unfolded state according to yet other embodiments of the present application;

[0056] FIG14 is a schematic structural diagram of an insulating member of a battery cell in an unfolded state according to yet other embodiments of the present application;

[0057] FIG15 is a schematic structural diagram of an insulating member of a battery cell in a wrapped state according to some embodiments of the present application;

[0058] FIG16 is a cross-sectional view of the structure of the battery cell shown in FIG15;

[0059] FIG17 is a schematic structural diagram of an insulating member of a battery cell before wrapping a battery cell assembly in some embodiments of the present application;

[0060] FIG18 is a schematic structural diagram of a battery cell bracket according to some embodiments of the present application;

[0061] FIG19 is a schematic structural diagram of a battery cell bracket according to some other embodiments of the present application;

[0062] FIG20 is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application;

[0063] FIG21 is a cross-sectional view of a structure of a battery cell bracket according to some embodiments of the present application;

[0064] FIG22 is a top view of a bracket of a battery cell according to some embodiments of the present application;

[0065] FIG23 is a top view of a bracket for a battery cell according to some other embodiments of the present application;

[0066] FIG24 is a front view of a battery cell according to some embodiments of the present application;

[0067] FIG25 is a front view of a battery cell according to some other embodiments of the present application;

[0068] FIG26 is a partial structural cross-sectional view of a battery cell according to some embodiments of the present application;

[0069] FIG27 is a partial structural cross-sectional view of a battery cell according to some other embodiments of the present application;

[0070] FIG28 is a partial structural cross-sectional view of a battery cell according to some other embodiments of the present application;

[0071] FIG29 is a partial structural cross-sectional view of a battery cell according to some further embodiments of the present application;

[0072] FIG30 is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application;

[0073] FIG31 is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application;

[0074] FIG32 is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application;

[0075] FIG33 is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application;

[0076] FIG34 is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application;

[0077] FIG35 is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application;

[0078] FIG36 is an exploded view of the structure of the battery cell shown in FIG35 ;

[0079] FIG37 is an exploded view of the structure of the first cover plate shown in FIG36;

[0080] FIG38 is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application;

[0081] FIG39 is an exploded view of the structure of the battery cell shown in FIG38 .

[0082] Reference numerals: Electric device 1000, battery 100, controller 200, motor 300, first direction Z, second direction X, third direction Y, axial direction R of pole, battery cell 10, housing 20, first housing 201, second housing 202, housing 11, housing body 111, opening 1110, mounting wall 1112, housing cover 112, first housing cover 1121, second housing cover 1122, mounting hole 113, Pole 12, accommodating portion 121, first accommodating groove 12110, first end wall 12111, first sunken groove 12112, first side wall 12113, second accommodating groove 12120, second end wall 12121, second sunken groove 12122, second side wall 12123, first groove section 12124, second groove section 12125, guiding inclined surface 12126, stepped surface 12127, through-hole 12130, pole inner end surface 122, pole outer end surface 123, first groove 126, spacer 127, first cover plate 13, first conductive member 131, second groove 1311, second conductive member 132, stress relief groove 133, second cover plate 14, battery cell assembly 2, first end 201, second end 202, active material coating portion 21, conductive portion 22, Bracket 3, through hole 311, guide groove 312, guide portion 32, first bracket 33, second bracket 34, limiting protrusion 38, first surface 381, second surface 382, ​​air avoidance portion 391, first liquid injection guide groove 392, accommodating groove 393, insulating member 4, connection mark 401, first dividing line 401a, second dividing line 401b, third dividing line 401c, main body insulating portion 41, main body 410, first main body portion 411, first main body surface 4111, first flange 4112, second flange 4113, second main body portion 412, second main body surface 4121, third flange 4122, fourth flange 4123, first insulating portion 42, center line 42a, second insulating portion 43, insulating sub-portion 430, main surface 431, sub-surface 432, notch 44, slot cover 7. DETAILED DESCRIPTION

[0083] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0084] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are for the purpose of describing specific embodiments only and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions.

[0085] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0086] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0087] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0088] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0089] The term "plurality" used in this application refers to two or more (including two).

[0090] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0091] In this application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application do not limit this. Battery cells may be cylindrical, flat, rectangular, or other shapes, etc., and the embodiments of this application do not limit this. Battery cells are generally divided into three types based on the packaging method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, and the embodiments of this application do not limit this.

[0092] The battery mentioned in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application can be a battery module or a battery pack. A battery module generally includes multiple battery cells. A battery pack generally includes a casing and one or more battery cells disposed in the casing, or a battery pack includes a casing and one or more battery modules disposed in the casing. The casing can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0093] Exemplarily, a battery cell may generally include a shell, an electrode assembly and an electrolyte. The shell is used to accommodate the electrode assembly and the electrolyte, and the shell is provided with at least one positive electrode column and at least one negative electrode column. The electrode assembly is formed by stacking or winding a positive electrode sheet, a negative electrode sheet and a separator. Among them, the positive electrode sheet may generally include a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is directly or indirectly coated on the positive electrode collector. The positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer. The positive electrode collector not coated with the positive electrode active material layer serves as a positive electrode tab. Multiple positive electrode tabs are stacked together and electrically connected to the positive electrode column. A negative electrode sheet generally includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is directly or indirectly coated on the negative electrode current collector. The negative electrode current collector uncoated with the negative electrode active material layer protrudes from the negative electrode current collector coated with the negative electrode active material layer. The negative electrode current collector uncoated with the negative electrode active material layer serves as a negative electrode tab. Multiple negative electrode tabs are stacked together and electrically connected to the negative electrode column. The separator can be made of any material and can, for example, be polypropylene or polyethylene.

[0094] At the same time, battery cells primarily rely on the movement of metal ions between the positive and negative electrodes to operate. Taking lithium-ion batteries as an example, the positive electrode current collector can be made of aluminum, the positive electrode active material layer can be made of lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode current collector can be made of copper, and the negative electrode active material layer can be made of carbon or silicon, etc. During the charge and discharge process, Li+ is intercalated and deintercalated back and forth between the two electrodes: during charging, Li+ is deintercalated from the positive electrode and intercalated into the negative electrode through the electrolyte, leaving the negative electrode in a lithium-rich state; during discharge, the opposite occurs.

[0095] Currently, market developments indicate that power batteries are becoming increasingly widely used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As power battery applications continue to expand, market demand is also growing.

[0096] In the related art, a battery cell generally includes a shell with an opening, a top cover, a cell assembly, an insulating part and a plastic part. The cell assembly is arranged in the shell, and a pole is provided on the top cover. The cell assembly is electrically connected to the pole. The plastic part is arranged on the side of the top cover close to the pole to provide insulation. The insulating part is covered on the bottom of the cell assembly away from the top cover, as well as the peripheral side of the cell assembly, and is connected to the plastic part to ensure insulation between the cell assembly and the shell, thereby ensuring the normal charging and discharging process of the battery.

[0097] However, the inventors discovered that when the battery cell assembly of the above structure is installed into the shell, the insulating parts are prone to wrinkling and edge curling due to friction with the shell, and are even prone to detaching from the plastic parts, resulting in leakage of the battery cell assembly, causing the battery cell assembly to contact the inner wall surface of the shell, causing the shell to be corroded, and affecting the reliability of the battery cell.

[0098] In view of this, in order to solve the above problems, the present application provides a battery cell, which provides a bracket at one end of the battery cell assembly, cooperates with the bracket to jointly cover the battery cell assembly, and connects at least a part of the insulating part to the wall of the bracket away from the battery cell assembly, so as to reduce the pulling of the shell on the connection position between the insulating part and the bracket during the shell insertion process, thereby reducing the movement and slippage of the insulating part during the shell insertion process, improving the connection reliability between the insulating part and the bracket, reducing the risk of the insulating part falling off, and further reducing the risk of the shell being corroded due to leakage of the battery cell assembly, reducing the risk of failure of the battery cell assembly itself, and reducing the risk of leakage, thereby improving the reliability and stability of the battery cell.

[0099] The battery cells disclosed in the embodiments of the present application can be used in electrical devices that use batteries as power sources or various energy storage systems that use batteries as energy storage elements. Electrical devices can include, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, battery-powered vehicles, electric vehicles, ships, spacecraft, and the like. Electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, among others.

[0100] Taking a vehicle as an example of an electrical device in an embodiment of the present application, the structures of the battery cell, battery, and electrical device provided in the embodiment of the present application are described in detail.

[0101] Please refer to Figure 1, which is a schematic structural diagram of a vehicle in which the power-consuming device 1000 provided in some embodiments of the present application is a vehicle. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. The vehicle is provided with a battery 100, and the battery 100 can be arranged at the bottom, head or tail of the vehicle. The battery 100 can be used to power the vehicle, for example, the battery 100 can be used as an operating power source for the vehicle. The vehicle may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for the starting, navigation and working power requirements of the vehicle during driving. In some embodiments of the present application, the battery 100 can not only serve as the operating power source of the vehicle, but also as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0102] Please refer to Figure 2, which is an exploded view of the structure of the battery cell 10 used in the battery 100 provided in some embodiments of the present application. The battery 100 includes a housing 20 and a plurality of battery cells 10, and the battery cells 10 are accommodated in the housing 20. The housing 20 is used to provide a storage space for the battery cells 10, and the housing 20 can adopt a variety of structures. In some embodiments, the housing 20 can include a first housing 201 and a second housing 202, which cover each other and together define a storage space for accommodating the battery cells 10. The second box body 202 can be a hollow structure with one end open, and the first box body 201 can be a plate-like structure. The first box body 201 covers the open side of the second box body 202, so that the first box body 201 and the second box body 202 jointly define an assembly space. Alternatively, the first box body 201 and the second box body 202 can both be hollow structures with one end open (for example, as shown in FIG. 2 ), with the open side of the first box body 201 covering the open side of the second box body 202. Of course, the box body 20 formed by the first box body 201 and the second box body 202 can be of various shapes, such as a cylinder or a rectangular parallelepiped.

[0103] In the battery 100, multiple battery cells 10 can be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to multiple battery cells 10 being connected both in series and in parallel. Multiple battery cells 10 can be directly connected in series, in parallel, or in a hybrid configuration, and then the entire battery system 10 can be housed within the housing 20. Alternatively, the battery 100 can be constructed by first connecting multiple battery cells 10 in series, in parallel, or in a hybrid configuration to form a battery module. The multiple battery modules are then connected in series, in parallel, or in a hybrid configuration to form an entire battery system, which is then housed within the housing 20. The battery 100 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 10.

[0104] Please refer to Figure 3, which is a schematic diagram of a battery cell 10 provided in some embodiments of the present application. In the embodiments of the present application, the battery cell 10 is a rectangular parallelepiped, with the height direction of the battery cell 10 being a first direction Z, the length direction of the battery cell 10 being a second direction X, and the thickness direction of the battery cell 10 being a third direction Y. The first direction Z, the second direction X, and the third direction Y are mutually perpendicular. Of course, in other embodiments of the present application, the battery cell 10 may also be cylindrical, flat, or have other shapes, and this embodiment is not limiting.

[0105] Please refer to Figures 4 and 5. Figure 4 is a cross-sectional view of the structure of a battery cell 10 in some embodiments of the present application. Figure 5 is a cross-sectional view of the structure of a battery cell 10 in some embodiments of the present application after the cell assembly 2, bracket 3, and insulating member 4 are assembled. In the embodiments of the present application, the battery cell 10 includes a housing 11, a cell assembly 2, bracket 3, and insulating member 4.

[0106] The shape of the shell 11 is adjusted according to the type of battery cell 10, and the type of battery cell 10 in the embodiments of the present application is not limited. For example, when the battery cell 10 is a square battery, the shell 11 is square. When the battery cell 10 is a cylindrical battery, the shell 11 is cylindrical. The embodiments of the present application are all described as if the shell 11 is square. At the same time, the shell 11 is provided with a pole 12, which is used to electrically connect to the battery cell assembly 2 to ensure the normal charging and discharging operation of the battery cell 10. Generally, the number of poles is at least two, specifically at least one positive pole and at least one negative pole. For example, when the number of poles is two, one is a positive pole and the other is a negative pole, and the two are electrically connected to the positive and negative output positions of the battery cell assembly 2 respectively; for another example, when the number of poles is four, two can be positive poles and two can be negative poles. In this case, both positive poles are electrically connected to the positive output position of the battery cell assembly 2, and both negative poles are electrically connected to the negative output position of the battery cell assembly 2. The shell 11 may also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 10 reaches a threshold value. The pressure relief mechanism can release pressure when the internal pressure or temperature of the battery cell 10 is too high to prevent thermal runaway from being transmitted to other battery cells 10.

[0107] Furthermore, in the embodiment of the present application, the housing 11 specifically includes a housing body 111 and a housing cover 112 .

[0108] The shell 111 is a semi-enclosed structure with an opening 1110 at one end, or a ring-shaped structure with openings 1110 at both ends. The shell 111 can have a variety of shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. The shape of the shell 111 can be determined based on the specific shape and size of the battery cell assembly 2. Furthermore, the shell 111 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment of the present application does not impose any particular limitations on this. The shell 111 has an opening 1110, which can be one or more.

[0109] The shell cover 112 is a component that covers the opening 1110 of the shell body 111 to isolate the internal environment of the battery cell 10 from the external environment. Furthermore, the number of shell covers 112 matches the number of openings 1110. When there is one opening 1110, there is also one shell cover 112, which covers the opening 1110 to close it. When there are two openings 1110, there are two shell covers 112, which cover the two openings 1110 to close the corresponding openings 1110. The shell cover 112 and the shell body 111 can form a common connection surface before other components are inserted into the shell. When the interior of the shell body 111 needs to be enclosed, the shell cover 112 is then placed over the shell body 111. Furthermore, the shape of the shell cover 112 can be adapted to match the shape of the shell body 111 to ensure compatibility. Optionally, the shell cover 112 can be made of a material with a certain hardness and strength (such as an aluminum alloy). In this way, the shell cover 112 is less likely to deform when squeezed or collided, so that the battery cell 10 can have a higher structural strength and improved safety performance. Functional components such as the terminal 12 can be provided on the shell cover 112. The shell cover 112 can also be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any special restrictions on this.

[0110] The shell 11 is provided with a pole 12, and the number of poles 12 is multiple. The multiple poles 12 can be all provided on the shell body 111, or all provided on the shell cover 112, or part of them can be provided on the shell body 111 and the other part of them can be provided on the shell cover 112. The following embodiments of the present application are all based on the shell body 111 being square, the number of openings 1110 of the shell body 111 being one, and the number of poles 12 being two, namely a positive pole and a negative pole, and both poles 12 being provided on the wall of the shell body 111 opposite to the opening 1110 for explanation. Of course, in other embodiments of the present application, the shape of the shell body 111, the number of openings 1110 and the shell cover 112, the number of poles 12, and the position of the poles 12 can all be adjusted according to needs, and the embodiments of the present application are not limited thereto.

[0111] In the embodiments of the present application, please refer to Figures 4 and 5, and further refer to Figure 6, which is an assembly diagram of the battery cell 10 in some embodiments of the present application. In the embodiments of the present application, the bracket 3 is provided at one end of the battery cell assembly 2. When assembling the battery cell 10, the bracket 3 can be first provided at one end of the battery cell assembly 2, and then the battery cell assembly 2 with the bracket 3 can be installed into the shell 11, so that the bracket 3 first enters the shell body 111 through the opening 1110 of the shell body 111, and then the battery cell assembly 2 enters the shell body 111. After the battery cell assembly 2 is installed in place in the shell body 111, the bracket 3 is located on the wall of the shell body 111 opposite to its opening 1110 and on the end of the battery cell assembly 2 away from the opening 1110.

[0112] Please refer to Figure 6 again. When the shell 111 has only one opening 1110, the bracket 3 is specifically arranged at the end of the battery cell assembly 2 away from the opening 1110. The opening 1110 can be located on the top wall, bottom wall or side wall of the shell 111. When the opening 1110 is located on the bottom wall of the shell 111, the remaining walls are all closed structures. The battery cell assembly 2 with the bracket 3 and the insulating member 4 can only be installed into the shell 111 from the opening 1110. After the battery cell assembly 2 is installed in place in the shell 111, the shell cover 112 is closed on the opening 1110 to seal the opening 1110. The insulating member 4 is pressed between the top wall of the shell 111 and the bracket 3, which can reduce the risk of the insulating member 4 falling off, reduce the risk of the battery cell assembly 2 failing due to leakage, and at the same time reduce the risk of the shell 11 being corroded, thereby improving the reliability and stability of the battery cell 10.

[0113] In the above technical solution, an opening 1110 is provided on the shell body 111, and the bracket 3 is provided at the end of the battery cell assembly 2 away from the opening 1110. The battery cell assembly 2 with the bracket 3 and the insulating part 4 can only be installed into the shell body 111 from the opening 1110. The shell entry direction is unique, which is conducive to improving the installation efficiency. The shell 11 will not scratch the edge of the insulating part 4, nor will it scratch the connection position between the insulating part 4 and the bracket 3. The connection reliability between the insulating part 4 and the bracket 3 can be improved, and the risk of the insulating part 4 falling off can be reduced. In addition, the risk of the shell 11 being corroded due to leakage of the battery cell assembly 2 can be reduced, the risk of failure of the battery cell assembly 2 itself can be reduced, and the risk of leakage can be reduced, thereby improving the reliability and stability of the battery single unit 10.

[0114] Please refer to Figure 6 again. In the embodiment of the present application, under the premise of providing an opening 1110 on the shell body 111, all the poles 12 can be provided on the end wall of the shell body 111 opposite to the opening 1110, so that the conductive portion 22 can pass through the bracket 3 and be electrically connected to the poles 12 on the end wall of the shell body 111. In other embodiments of the present application, all the poles 12 can also be provided on the shell cover 112, that is, all the poles 12 are located on the side of the battery cell assembly 2 away from the bracket 3, and the conductive portion 22 can be electrically connected to the poles 12 on the shell cover 112. Alternatively, in other embodiments of the present application, one of the poles 12 can be provided on the shell cover 112, and the other pole 12 can be provided on the end wall of the shell body 111 opposite to the opening 1110, and one of the conductive portions 22 can be electrically connected to the pole 12 on the shell cover 112.

[0115] Specifically, referring again to FIG. 6 , in the embodiment of the present application, an opening 1110 is provided on the housing 111, and the end wall of the housing 111 opposite the opening 1110 is defined as a mounting wall 1112, with all the poles 12 being mounted on the mounting wall 1112. This structural arrangement allows the battery cell 10 to be assembled by allowing the cell assembly 2 to enter the housing 111 through the opening 1110, with the conductive portion 22 directly facing the pole 12. This allows the conductive portion 22 to be easily connected to the pole 12, thereby significantly improving the assembly efficiency of the battery cell 10.

[0116] It should be noted that, in the embodiment of the present application, the mounting wall 1112 is specifically the top wall of the shell body 111 (i.e., the end of the current collecting component closer to the battery), and the bottom wall of the shell body 111 (i.e., the end of the current collecting component away from the battery) has an opening 1110. Through such an arrangement, on the one hand, the shell cover 112 is provided at the bottom of the shell body 111, and the battery cell assembly 2 can be installed into the shell body 111 from bottom to top along the Z direction, so that the conductive part 22 can be easily connected to the pole 12. On the other hand, the pulling of the current collecting component on the shell body 111 is not easily concentrated at the position where the shell body 111 and the shell cover 112 cooperate, and the position where the two cooperate is not easy to crack, thereby effectively improving the reliability and stability of the battery cell 10.

[0117] Please refer to Figure 7, which shows an assembly diagram of a battery cell 10 in other embodiments of the present application. In other embodiments of the present application, the number of openings 1110 on the shell body 111 can be set to two, and each opening 1110 is covered by a shell cover 112. In this structure, the bracket 3 is specifically arranged at the end of the battery cell assembly 2 away from any opening 1110.

[0118] Through such an arrangement, when assembling the battery cell 10, the battery cell assembly 2 with the bracket 3 and the insulating part 4 can be loaded into the shell body 111 from any opening 1110. After the battery cell assembly 2 is installed in place in the shell body 111, the two shell covers 112 are respectively covered on the two openings 1110 to seal the corresponding openings 1110. After the battery cell assembly 2 with the two brackets 3 is put into the shell, one of the conductive parts 22 passes through one bracket 3 and is electrically connected to the pole 12 on the corresponding shell cover 112, and the other conductive part 22 passes through the other bracket 3 and is electrically connected to the pole 12 on the corresponding shell cover 112.

[0119] Specifically, referring again to FIG7 , when there are two openings 1110 on the housing 111, the two openings 1110 can be located on the top wall, bottom wall, or side wall of the housing 111. Furthermore, the two openings 1110 can be located on two oppositely disposed walls of the housing 111. As shown in FIG7 , the two openings 1110 can be located on the top wall and bottom wall of the housing 111, respectively. In other embodiments, the two openings 1110 can also be located on two oppositely disposed side walls of the housing 111, respectively, or on two adjacent walls of the housing 111. Details will not be repeated here.

[0120] It should be noted that when the two openings 1110 are respectively provided on two oppositely disposed walls of the housing 111, the remaining walls are all closed structures, with one opening 1110 being covered by the first housing cover 1121, and the other opening 1110 being covered by the second housing cover 1122. In this case, all the poles 12 can be provided on the first housing cover 1121, or all the poles 12 can be provided on the second housing cover 1122, or a portion of the poles 12 can be provided on the first housing cover 1121 or the second housing cover 1122, while the remaining portion of the poles 12 can be provided on the housing 111.

[0121] For example, please refer to Figure 7 again. When the number of openings 1110 is two, the two openings 1110 can be respectively a first opening and a second opening arranged opposite to each other. A pole 12 is respectively provided on the first shell cover 1121 and the second shell cover 1122. A bracket 3 is provided at both ends of the battery cell assembly 2. When the battery cell 10 is assembled, the battery cell assembly 2 with the bracket 3 can be first installed into the shell 11, so that the bracket 3 first enters the shell body 111 from the first opening of the shell body 111 and moves toward the second opening. Then the battery cell assembly 2 enters the shell body 111. After the battery cell assembly 2 is installed in place in the shell body 111, the bracket 3 is located at the second opening.

[0122] In the above technical solution, two openings 1110 are provided on the shell body 111, and a bracket 3 is provided at one end of the battery cell assembly 2 away from any opening 1110. The battery cell assembly 2 with two brackets 3 and an insulating member 4 can be loaded into the shell body 111 from any opening 1110, and a suitable shell entry direction can be selected as needed. During the shell entry process, the bracket 3 can be used to guide the battery cell assembly 2 into the shell to ensure assembly efficiency. After the battery cell assembly 2 is installed in place in the shell body 111, a portion of the insulating member 4 can be pressed between the wall of the shell body 111 opposite to one of the openings 1110 and the corresponding bracket 3, and another portion of the insulating member 4 can be pressed between the wall of the shell body 111 opposite to the other opening 1110 and the corresponding bracket 3, further reducing the risk of the insulating member 4 falling off, reducing the risk of the battery cell assembly 2 failing due to leakage, and at the same time reducing the risk of corrosion of the shell 11, thereby improving the reliability and stability of the battery cell 10.

[0123] At least one terminal 12 is provided on the side of the housing 11 adjacent to the bracket 3. The battery cell assembly 2 with the bracket 3 and the insulating member 4 enters the housing 111 through the opening 1110. The conductive portion 22 directly faces the terminal 12, making it easier to connect the conductive portion 22 with the terminal 12 and improving the assembly efficiency of the battery cell 10.

[0124] Referring again to Figure 5 , in the embodiment of the present application, the insulating member 4 cooperates with the bracket 3, and the two together cover the battery cell assembly 2. Because the bracket 3 is disposed at one end of the battery cell assembly 2, the insulating member 4 can cover the battery cell assembly 2 from the remaining several sides of the battery cell assembly 2, so that the entire battery cell assembly 2 is insulated from the shell 11 in the circumferential direction. In other words, the insulating member 4 can improve the insulation reliability between the battery cell assembly 2 and the shell 11, reduce or prevent the battery cell assembly 2 from contacting the shell 11 and causing corrosion of the shell 11, reduce the problem of electrolyte leakage caused by corrosion of the shell 11, and improve the reliability of the battery cell 10.

[0125] At the same time, Figure 8 is a top view of a battery cell of some embodiments of the present application. Figure 9 is a top view of a battery cell of other embodiments of the present application. Figure 10 is a top view of a battery cell of yet other embodiments of the present application. Referring to Figures 8 to 10, in the embodiments of the present application, the insulating member 4 cooperates with the bracket 3, and at least a portion of the insulating member 4 can be connected to the wall of the bracket 3 away from the battery cell assembly 2. Referring to Figure 6 again, for the convenience of description, it can be defined that the battery cell assembly 2 has a first end 201 and a second end 202 that are relatively set, the bracket 3 can be provided at the first end 201 of the battery cell assembly 2, and the insulating member 4 can be connected to the wall of the bracket 3 away from the first end 201 of the battery cell assembly 2. Therefore, the connection position between the insulating member 4 and the bracket 3 is located on the wall of the bracket 3 away from the first end 201 of the battery cell assembly 2, and the edge of the insulating member 4 close to the first end 201 of the battery cell assembly 2 is located on the wall of the bracket 3 away from the first end 201 of the battery cell assembly 2.

[0126] In the technical solution of the embodiment of the present application, by connecting at least a portion of the insulating member 4 to the wall of the bracket 3 away from the battery cell assembly 2, on the one hand, in the process of installing the battery cell assembly 2 with the bracket 3 into the shell 11, the shell 11 is not easy to scratch the connection position between the insulating member 4 and the bracket 3, and the connection position between the insulating member 4 and the bracket 3 is not easy to be pulled apart during the shell insertion process, which can reduce the movement and slippage of the insulating member 4 during the shell insertion process of the battery cell assembly 2, improve the connection reliability between the insulating member 4 and the bracket 3, and reduce the risk of the insulating member 4 falling off, thereby reducing the risk of the shell 11 being corroded due to the leakage of the battery cell assembly, reducing the risk of the battery cell assembly 2 itself failing, and reducing the risk of liquid leakage, thereby improving The reliability and stability of the battery cell 10 are improved. Compared to connecting the insulating member 4 to the periphery of the battery cell assembly 2, the insulating member 4 is matched with the bracket 3, so that the insulating member 4 is originally adjacent to the four periphery surfaces of the housing 11. This greatly reduces the chance of interference between the insulating member 4 and the bracket 3 due to the insulating member 4 being adjacent to one surface at one end of the housing 11. This can further improve the reliability and stability of the insulating member 4 and the reliability and stability of the battery cell 10. In addition, connecting at least a portion of the insulating member 4 to the wall of the bracket away from the battery cell assembly 2 can also make the insulating member 4 longer, making it suitable for battery cell assemblies 2 of different sizes, having higher compatibility, and improving manufacturability. On the other hand, after the bracket 3 and the battery cell assembly 2 are installed in place within the housing 11, the insulating member 4 is pressed between the wall of the housing 11 opposite the opening 1110 and the bracket 3, further reducing the risk of the insulating member 4 falling off, reducing the risk of the battery cell assembly 2 failing due to leakage, and reducing the risk of corrosion of the housing 11, thereby improving the reliability and stability of the battery cell 10.

[0127] In addition, since the poles 12 are all arranged at positions opposite to the shell body 111 and the opening 1110, and the position where the insulating member 4 cooperates with the bracket 3 is located on the side of the bracket 3 away from the battery cell assembly 2, as the battery cell assembly 2 enters the shell, if the insulating member 4 located at the circumferential part of the battery cell assembly 2 contacts the shell body 111, the shell body 111 will gradually straighten the insulating member 4, making it less likely to accumulate or wrinkle, and the insulation effect between the battery cell assembly 2 and the shell 11 is more stable, which can further improve the reliability and stability of the battery cell 10.

[0128] Referring again to Figures 8 to 10 , in the embodiment of the present application, the insulating member 4 is connected to the bracket 3 at intervals in an annular pattern along the circumference of the wall away from the battery cell assembly 2. In other words, the insulating member 4 is connected to the bracket 3 at multiple locations, and these multiple connection locations are spaced apart along the circumference of the bracket 3. While ensuring the reliability and stability of the connection between the insulating member 4 and the bracket 3 along the circumference of the bracket 3, this can save connection materials, reduce material costs, simplify connection steps, and improve production efficiency.

[0129] Of course, in other embodiments of the present application, the insulating member 4 and the wall of the bracket 3 away from the battery cell assembly 2 can also be continuously connected in a circumferential ring shape. The ring connection here means that the connection position between the insulating member 4 and the bracket 3 extends along the circumference of the bracket 3 to form a closed ring. Such an arrangement can increase the connection area between the insulating member 4 and the bracket 3, thereby improving the reliability and stability of the connection between the insulating member 4 and the bracket 3 in the circumferential direction of the bracket 3, further reducing the risk of the insulating member 4 falling off, and thereby improving the reliability of the battery cell assembly 2 entering the shell, ensuring the reliability and stability of the battery cell 10.

[0130] In addition, in other embodiments of the present application, the connection positions between the insulating member 4 and the bracket 3 can be concentrated on two opposite sides, two adjacent sides, or multiple sides of the bracket 3. The specific selection can be based on the actual shapes of the battery cell assembly 2 and the bracket 3, and is not limited here.

[0131] Please refer to Figures 8 to 10 again. In the embodiment of the present application, the connection method between the insulating member 4 and the bracket 3 can be a hot melt connection, and the insulating member 4 and the bracket 3 are hot-melt connected away from the wall of the battery cell assembly 2 to form a connection mark 401. The position of the connection mark 401 is not limited by space. Compared with the related art, the area of ​​the connection mark 401 can be designed to be larger, making the connection more secure and reducing the risk of the insulating member 4 falling off.

[0132] Specifically, in the embodiment of the present application, there are multiple connection marks 401, and the multiple connection marks 401 are arranged at intervals around the circumference of the wall surface of the bracket 3 away from the battery cell assembly 2. In other embodiments of the present application, the connection marks 401 can also extend in an annular manner around the circumference of the wall surface of the bracket 3 away from the battery cell assembly 2, so as to make the connection between the insulating member 4 and the bracket 3 more secure, thereby fully improving the connection reliability between the insulating member 4 and the bracket 3 and reducing the risk of the insulating member 4 falling off.

[0133] It should be noted that, in the embodiment of the present application, the shape of the connection mark 401 can be rectangular, circular, elliptical, etc., or it can be an irregular shape. The arrangement of the multiple connection marks 401 can be selected according to the actual shape of the battery cell assembly 2 and the bracket 3. For example, when the cross-sectional shape of the battery cell assembly 2 and the bracket 3 is square or rectangular, the multiple connection marks 401 can be distributed near the four edges of the bracket 3, or they can be concentrated near the edges on opposite sides of the bracket 3. For another example, when the cross-sectional shape of the battery cell assembly 2 and the bracket 3 is circular, the multiple connection marks 401 can be evenly distributed around the circumference of the wall of the bracket 3 away from the battery cell assembly 2.

[0134] Of course, the distribution form of multiple connection marks 401 is not limited to the above form, and the distance between two adjacent connection marks 401 can be adjusted as needed. The number of connection marks 401 can be appropriately increased to save materials and reduce costs while ensuring the connection reliability between the insulating part 4 and the bracket 3.

[0135] Taking the cell assembly 2 as a rectangular parallelepiped as an example, in the embodiments of the present application, the bracket 3 can be a rectangular plate of corresponding shape, the bracket 3 is arranged on one wall surface of the cell assembly 2, and the insulating member 4 wraps around the remaining five circumferential walls of the cell assembly 2 to ensure the insulation effect between the cell assembly 2 and the housing 11. At the same time, the connection mark 401 formed by the insulating member 4 and the wall surface of the bracket 3 away from the cell assembly 2 can be arranged adjacent to the circumferential edge of the bracket 3, and can be adjacent to two, three, or four circumferential edges of the bracket 3. The number of connection marks 401 formed by the insulating member 4 connecting with the corresponding edges can be increased or decreased according to the size of the corresponding edges, and the embodiments of the present application are not limited thereto.

[0136] In the above technical solution, on the one hand, the hot-melt connection method is adopted, which can facilitate the cooperation between the insulating part 4 and the bracket 3, improve the assembly efficiency, ensure the efficiency of the battery cell assembly 2 entering the shell, and save the assembly and manufacturing costs; on the other hand, whether the connection mark 401 is extended in a circumferential ring or arranged in a circumferential interval, it can improve the firmness of the connection between the insulating part 4 and the bracket 3, and improve the reliability and stability of the connection between the insulating part 4 and the bracket 3, so as to fully reduce the risk of the insulating part 4 falling off; at the same time, compared with the circumferential ring extension, the circumferential interval arrangement can also save materials and reduce costs on the basis of ensuring the reliability of the connection between the insulating part 4 and the bracket 3.

[0137] Please refer to Figures 4 and 5 again. According to some embodiments of the present application, please refer to Figures 3 to 5 again. In the embodiments of the present application, the battery cell assembly 2 specifically includes an active material coating portion 21 and a conductive portion 22. The active material coating portion 21 is housed in the shell 11. The active material coating portion 21 is the portion of the battery cell assembly 2 coated with active material, which can assist in the deintercalation of metal ions during the charge and discharge process of the battery cell 10. The conductive portion 22 is a metal structure that electrically connects the active material coating portion 21 and the pole 12, and is not coated with active material. At the same time, the conductive portion 22 is connected to the side of the active material coating portion 21 close to the bracket 3, and the conductive portion 22 extends toward the pole 12. The conductive portion 22 is connected to the pole 12 so that the battery cell 10 can charge and discharge. The insulating member 4 is specifically coated together with the bracket 3 on the circumference of the active material coating portion 21. That is, in the battery cell assembly 2, except for the conductive portion 22 extending out of the bracket 3 to connect with the pole 12, the remaining surface is wrapped by the insulating member 4 and the bracket 3.

[0138] In the above technical solution, the insulating part 4 and the bracket 3 jointly cover the circumference of the active material coating part 21. On the one hand, the active material coating part 21 can be completely separated from the shell 11, reducing the exposure of the active material coating part 21, reducing the risk of failure and damage of the battery cell assembly 2, and improving the reliability and stability of the battery cell 10. On the other hand, the size of the insulating part 4 can be reduced, saving the cost of the insulating part 4; at the same time, the insulating part 4 can be stabilized and protected by the bracket 3 to fully ensure the reliability and stability of the battery cell 10.

[0139] It should be noted that in the embodiments of the present application, the active material coating portion 21 is divided into a positive electrode active material coating portion and a negative electrode active material coating portion. The positive electrode active material coating portion includes the portion of the positive electrode current collector coated with the positive electrode active material layer, and the negative electrode active material coating portion includes the portion of the negative electrode current collector coated with the negative electrode active material layer. The conductive portion 22 is divided into a positive electrode conductive portion and a negative electrode conductive portion. The positive electrode conductive portion electrically connects the positive electrode active material coating portion and the positive electrode post, and the negative electrode conductive portion electrically connects the negative electrode active material coating portion and the negative electrode post.

[0140] Please refer to Figures 11 to 13. Figure 11 is a schematic diagram of the structure of the insulating part of the battery cell in some embodiments of the present application in the unfolded state. Figure 12 is a schematic diagram of the structure of the insulating part of the battery cell in some other embodiments of the present application in the unfolded state. Figure 11 is a schematic diagram of the structure of the insulating part of the battery cell in some other embodiments of the present application in the unfolded state. Figure 13 is a schematic diagram of the structure of the insulating part of the battery cell in some other embodiments of the present application in the unfolded state. In the embodiment of the present application, the insulating part 4 has an unfolded state and a wrapped state. When the insulating part 4 is in the unfolded state, the insulating part 4 does not wrap the battery cell assembly 2, and the insulating part 4 has a planar structure. When the insulating part 4 is in the wrapped state, the insulating part 4 and the bracket 3 jointly cover the circumference of the active material coating part 21. By setting the unfolded state of the insulating part 4 to a planar structure, it is convenient to realize the wrapping of the battery cell assembly 2 by the insulating part 4, which can facilitate the transition of the insulating part 4 to the wrapped state, and can improve the assembly convenience of the battery cell 10.

[0141] Please refer to Figures 15 to 17. Figure 15 is a schematic structural diagram of the insulating part of the battery cell in some embodiments of the present application in a wrapped state. Figure 16 is a cross-sectional view of the structure of the battery cell shown in Figure 15. Figure 17 is a schematic structural diagram of the insulating part of the battery cell in some embodiments of the present application before wrapping the battery cell assembly. In the embodiment of the present application, the insulating part 4 includes a main insulating part 41, a first insulating part 42, and a second insulating part 43. The first insulating part 42 and the second insulating part 43 are respectively arranged at both ends of the main insulating part 41. The main insulating part 41 is wrapped around the circumference of the active material coating part 21. The first insulating part 42 is located on the side of the main insulating part 41 away from the bracket 3, and the first insulating part 42 is wrapped around the end of the active material coating part 21 away from the bracket 3. The second insulating part 43 is located on the side of the main insulating part 41 close to the bracket 3, and the second insulating part 43 cooperates with the bracket 3. The second insulating part 43 and the bracket 3 jointly cover the end of the active material coating part 21 close to the bracket 3.

[0142] Among them, the cross-section of the active material coating part 21 can be circular, rectangular or polygonal, etc. When the cross-section of the active material coating part 21 is circular, the main insulating part 41 can be rolled into a shape that is adapted to the shape of the circumference (cylindrical surface) of the active material coating part 21 to wrap the circumference of the active material coating part 21, that is, the cross-sectional shape of the main insulating part 41 is a circular ring. When the cross-section of the active material coating part 21 is rectangular, the main insulating part 41 can be folded into a shape that is adapted to the shape of the circumference (four side walls) of the active material coating part 21 to wrap the circumference of the active material coating part 21, that is, the cross-sectional shape of the main insulating part 41 is a rectangular ring. When the cross-section of the active material coating part 21 is polygonal, the main insulating part 41 can be folded into a shape that is adapted to the shape of the circumference (multiple side walls) of the active material coating part 21 to wrap the circumference of the active material coating part 21, that is, the cross-sectional shape of the main insulating part 41 is a polygonal ring.

[0143] Referring to Figures 15-17 , when the battery cell 10 is placed vertically, the bracket 3 is disposed on the upper side of the active material coating portion 21 (the side indicated by the arrow pointing upward in the Z direction of the active material coating portion 21), and the conductive portion 22 extends from the bracket 3 . The main insulating portion 41 wraps around the circumference of the active material coating portion 21, and the first insulating portion 42 wraps around the lower side of the active material coating portion 21 (the side indicated by the arrow pointing downward in the Z direction of the active material coating portion 21). Referring again to Figures 8-10 , the second insulating portion 43 and the bracket 3 jointly cover the upper side of the active material coating portion 21. Thus, the insulating member 4 is composed of multiple parts, and these multiple parts can jointly cover the sides, bottom, and top of the active material coating portion 21 with the bracket 3, completely isolating the active material coating portion 21 from the housing 11, thereby substantially reducing exposure of the active material coating portion 21, reducing the risk of failure and damage to the battery cell assembly 2, reducing the risk of corrosion of the housing 11, and improving the reliability and stability of the battery cell 10.

[0144] Please refer to Figures 11 and 17 again. In an embodiment of the present application, the main insulating portion 41 may include a plurality of main portions 410, and the plurality of main portions 410 are connected end to end in a ring shape. The plurality of main portions 410 are jointly wrapped around the circumference of the active material coating portion 21, and the first insulating portion 42 and the second insulating portion 43 are respectively located at the two ends of the ring structure formed by the plurality of main portions 410.

[0145] Specifically, the number of main body parts 410 can be two, three or more than three, and can be selected specifically according to the shape of the active material coating part 21. For example, the number of main body parts 410 and the number of surfaces on the peripheral side of the active material coating part 21 can be set in a one-to-one correspondence, that is, multiple main body parts 410 cover multiple surfaces on the peripheral side of the active material coating part in a one-to-one correspondence. For another example, the number of main body parts 410 can be less than the number of surfaces on the peripheral side of the active material coating part 21, that is, when the insulating part 4 is in the unfolded state, the surface area of ​​at least one main body part 410 is greater than the surface area of ​​one surface on the peripheral side of the active material coating part 21, so that the main body part 410 can be used to cover two or more surfaces on the peripheral side of the active material coating part 21. For another example, the number of main body parts 410 can be more than the number of surfaces on the peripheral side of the active material coating part 21, so that at least a part of the multiple main body parts 410 can be overlapped.

[0146] After being connected, the multiple main body parts 410 form a ring shape, which can completely wrap the peripheral side of the active material coating part 21, so that the peripheral side of the active material coating part 21 is completely separated from the inner wall of the shell 11, reducing the risk of leakage of the active material coating part 21 and improving the reliability and stability of the battery cell 10.

[0147] As an optional solution, in the embodiment of the present application, the connection positions of any two adjacent main bodies 410 partially overlap. In the above technical solution, on the one hand, the connection positions of the main bodies 410 overlap, making the connection positions difficult to separate or disconnect, which can reduce the probability and risk of insulation failure at the overlapping positions of the two, and can improve the reliability of the battery cell assembly 2, thereby improving the stability and reliability of the battery cell 10; on the other hand, the connection positions of the main bodies 410 overlap, which can fully ensure that the entire insulating member 4 can be wrapped around the circumference of the active material coating portion 21, fully reduce the exposure of the active material coating portion 21, reduce the risk of corrosion of the shell 11, and further improve the reliability and stability of the battery cell assembly 2 and the battery cell 10.

[0148] Further optionally, in an embodiment of the present application, the peripheral side of the active material coating portion 21 has multiple surfaces; please refer to Figure 13 again, each main body portion 410 includes a main body surface and two flanges, the two flanges are arranged on both sides of the main body surface, and any two adjacent main bodies 410 are connected by flanges, and the connection structure of each main body surface and each two flanges respectively wraps different surfaces of the peripheral side of the active material coating portion 21.

[0149] Specifically, the peripheral side of the active material coating part 21 can have four surfaces, six surfaces or more surfaces. In the embodiment where the peripheral side of the active material coating part 21 has four surfaces, the number of the main body parts 410 can be two, and the main surfaces of the two main body parts 410 can cover the two oppositely disposed surfaces of the active material coating part 21. The same side flanges of the two main body parts 410 are connected together to cover the other surface of the active material coating part 21.

[0150] In the embodiment in which the circumferential side of the active material coating portion 21 has six surfaces, for the convenience of description, the circumferential side of the active material coating portion 21 can be defined as having three first surfaces and three second surfaces, and the three first surfaces and the three second surfaces are alternately arranged in the circumferential direction of the active material coating portion, that is, there is a second surface between two adjacent first surfaces, and there is a first surface between two adjacent second surfaces. Correspondingly, the number of main bodies 410 can be three, and the main surfaces of the three main bodies 410 can respectively cover the three spaced first surfaces of the active material coating portion 21, and the flanges of two adjacent main bodies 410 are connected together to cover the second surface of the active material coating portion 21.

[0151] In the above technical solution, on the one hand, any two adjacent main body parts 410 can be connected by flange connection to ensure the reliability of the connection, so as to improve the reliability and stability of the battery cell assembly 2 and the battery single cell 10; on the other hand, the main body surface and the connection position of each two flanges respectively wrap different surfaces of the peripheral side of the active material coating part 21, so that each surface of the peripheral side of the active material coating part 21 can be effectively wrapped, which can further improve the reliability of the battery cell assembly 2 and improve the stability and reliability of the battery single cell 10.

[0152] Here, please refer to Figure 13 again. The widths of the flanges of multiple main bodies 410 can be equal, and the widths of the flanges of multiple main bodies 410 can also be unequal. For example, as shown in Figure 14, in this embodiment, the width difference of the flanges on the same side of two adjacent main bodies 410 can be L, and L is greater than zero.

[0153] More specifically, referring to FIG. 8 to FIG. 10 again, in some embodiments, the peripheral side of the active material coating portion 21 has four surfaces, that is, the cross-sectional outer contour of the active material coating portion 21 is a quadrilateral.

[0154] Referring again to Figures 11 and 12 , the main body insulating portion 41 includes two main bodies 410, which are disposed on either side of the first insulating portion 42. The two main bodies 410 are respectively a first main body 411 and a second main body 412. As shown in Figure 13 , the first main body 411 includes a first main surface 4111, a first flange 4112, and a second flange 4113, which are respectively disposed on either side of the first main surface 4111. The second main body 412 includes a second main surface 4121, a third flange 4122, and a fourth flange 4123, which are respectively disposed on either side of the second main surface 4121.

[0155] 15 and 17 , the first flange 4112 is connected to the third flange 4122, the second flange 4113 is connected to the fourth flange 4123, and the connection structure of the first main surface 4111, the first flange 4112 and the third flange 4122, and the connection structure of the second main surface 4121, the second flange 4113 and the fourth flange 4123 respectively wrap the four circumferential surfaces of the active material coating part 21 arranged in sequence.

[0156] In order to clearly describe the structure of the first main body 411 and the second main body 412, four auxiliary lines are drawn in FIG13, namely, four first dividing lines 401a, wherein two first dividing lines 401a divide the first main body 411 into a first main surface 4111, a first flange 4112 and a second flange 4113, and the other two first dividing lines 401a divide the second main body 412 into a second main surface 4121, a third flange 4122 and a fourth flange 4123.

[0157] Specifically, when the insulating part 4 is in the expanded state, one end of the first main body surface 4111 in the width direction and one end of the second main body surface 4121 in the width direction are connected by the first insulating part 42, one end of the first main body surface 4111 in the length direction is provided with a first flange 4112 and the other end is provided with a second flange 4113, that is, the first main body surface 4111 separates the first flange 4112 from the second flange 4113, one end of the second main body surface 4121 in the length direction is provided with a third flange 4122 and the other end is provided with a fourth flange 4123, that is, the second main body surface 4121 separates the third flange 4122 from the fourth flange 4123.

[0158] Please refer to Figures 8-10 and 15-17 again. When the insulating part 4 is in the wrapped state, the first flange 4112 is connected to the third flange 4122, and the second flange 4113 is connected to the fourth flange 4123, so that the connection structure of the first main surface 4111, the first flange 4112 and the third flange 4122, and the connection structure of the second main surface 4121, the second flange 4113 and the fourth flange 4123 form a ring structure. In this way, the first main surface 4111 and the second main surface 4121 can respectively cover the two oppositely disposed surfaces of the active material coating part 21, and the connection structure of the first flange 4112 and the third flange 4122, and the connection structure of the second flange 4113 and the fourth flange 4123 can respectively cover the other two oppositely disposed surfaces of the active material coating part 21.

[0159] In an embodiment of the present application, the circumferential side of the active material coating part 21 has four surfaces, namely two relatively large surfaces and two relatively small surfaces. The first main surface 4111 and the second main surface 4121 respectively cover the two relatively large surfaces on the circumferential side of the active material coating part 21. The first flange 4112 and the third flange 4122 are connected and cover a small surface on the circumferential side of the active material coating part 21. The second flange 4113 and the fourth flange 4123 are connected and cover another small surface on the circumferential side of the active material coating part 21. The first insulating part 42 covers the end of the active material coating part 21 away from the bracket 3. The second insulating part 43 cooperates with the bracket 3. The second insulating part 43 and the bracket 3 jointly cover the end of the active material coating part 21 close to the bracket 3.

[0160] When the circumferential side of the active material coating portion 21 has four surfaces, the battery cell 10 is roughly square. At this time, the first main body portion 411 and the second main body portion 412, as well as their connection structure can completely cover the four circumferential sides of the active material coating portion 21, so that the four circumferential sides of the active material coating portion 21 are completely separated from the inner wall of the shell, reducing the risk of leakage of the active material coating portion 21, and fully improving the reliability and stability of the square battery cell 10.

[0161] Please refer to Figures 11 to 13 again. In some embodiments, the first insulating portion 42 has a center line 42a, and the first main body portion 411 and the second main body portion 412 are respectively located on both sides of the center line 42a of the first insulating portion 42. With the center line 42a as the axis of symmetry, the first main body portion 411 and the second main body portion 412 are symmetrically arranged, or the first main body surface 4111 and the second main body surface 4121 are symmetrically arranged.

[0162] Specifically, in the process of wrapping the insulating part 4 on the battery cell assembly 2, one main body 410 of the insulating part 4 can first cover one surface of the peripheral side of the active material coating part 21, and then the other main body 410 of the insulating part 4 can cover the other surface of the peripheral side of the active material coating part 21. The two main bodies 410 are used to first cover the two oppositely arranged surfaces of the peripheral side of the active material coating part 21, and then the subsequent wrapping action is performed; the wrapping direction can also be reversed, which is convenient to operate and conducive to improving production efficiency.

[0163] When the two main bodies 410 are completely symmetrical, it is convenient to open the mold and manufacture the insulating part 4, which can also save costs and improve production efficiency; when the two main bodies are arranged symmetrically, the flanges of the two main bodies 410 can be set asymmetrically. At this time, the flange of one main body 410 can be set longer, and the flange of the adjacent main body 410 can be set shorter, so that when the two main bodies 410 are connected, the longer flange can wrap the shorter flange. On the basis of cost savings, the risk of leakage of the active material coating part 21 and the risk of corrosion of the shell 11 can be reduced, thereby fully improving the reliability and stability of the square battery cell 10.

[0164] Of course, when the insulating member 4 is in the expanded state, the insulating member 4 may be a non-axisymmetric structure, and the insulating member 4 may be cut as needed, which is not limited in the embodiments of the present application.

[0165] Please refer to Figure 11 and Figure 15-17 again. In the embodiment of the present application, the second insulating portion 43 includes a plurality of insulating sub-portions 430. The plurality of insulating sub-portions 430 are connected to the plurality of main portions 410 in a one-to-one correspondence. Any two adjacent insulating sub-portions 430 partially overlap.

[0166] Specifically, when the insulating part 4 is in the wrapped state, the multiple insulating sections 430 of the second insulating part 43 are located on the wall of the bracket 3 away from the active material coating part 21, and the multiple insulating sections 430 are arranged in the circumferential direction of the bracket 3. Any two adjacent insulating sections 430 are partially overlapped, so that the multiple insulating sections 430 are connected to form a ring-shaped second insulating part 43, effectively reducing the corrosion of the shell 11 due to the exposure of the active material coating part 21.

[0167] In the process of installing the battery cell assembly 2 with the bracket 3 into the shell 11, the bracket 3 first enters the shell 11. Since the second insulating part 43 is located on the wall of the bracket 3 away from the active material coating part 21, the insulating part 4 can enter the shell 11 along the shell entry direction, and the shell 11 will not scratch the edge of the insulating part 4, reducing the movement and slippage of the insulating part 4; after the bracket 3 and the battery cell assembly 2 are installed in place in the shell 11, the second insulating part 43 is pressed between the wall of the shell 11 opposite to the opening 1110 and the bracket 3, further reducing the risk of the insulating part 4 falling off, reducing the phenomenon of the active material coating part 21 corroding the shell 11 due to leakage, and facilitating installation.

[0168] 11 again, the widths of the plurality of insulating sections 430 of the second insulating portion 43 can be set equal. Referring to FIG12 , the widths of the plurality of insulating sections 430 of the second insulating portion 43 can be set unequal, which can be selected according to actual needs.

[0169] Please refer to Figure 14 again. Each insulating section 430 includes a main surface 431 and two sub-surfaces 432. The main surface 431 is connected to the main surface of the corresponding main body 410. The two sub-surfaces 432 are respectively connected to the two flanges of the corresponding main body 410. The two sub-surfaces 432 corresponding to any two adjacent flanges are connected and arranged, and each sub-surface 432 is connected to the adjacent main surface 431.

[0170] In order to clearly describe the structure of the first main body 411 and the second main body 412, auxiliary lines are made in Figure 14, namely the first dividing line 401a, the second dividing line 401b, and the third dividing line 401c. Among them, the two first dividing lines 401a divide the first main body 411 into the first main surface 4111, the first flange 4112 and the second flange 4113, and the other two first dividing lines 401a divide the second main body 412 into the second main surface 4121, the third flange 4122 and the fourth flange 4123. The second dividing line 401b is the dividing line between the main surface 431 of the second insulating part 43 and the first main surface 4111 / the second main surface 4121. The four third dividing lines 401c are the dividing lines between the first flange 4112, the second flange 4113, the third flange 4122, the fourth flange 4123 and the corresponding four dividing surfaces 432.

[0171] In the above technical solution, by setting the main surface 431 and the sub-surface 432 , the insulating member 4 can be easily wrapped to the outside of the battery cell assembly 2 , thereby ensuring manufacturing and assembly efficiency and saving manufacturing and assembly costs.

[0172] In some embodiments, the two facets 432 corresponding to any two adjacent flanges are partially overlapped; and / or, each facet 432 is partially overlapped with the adjacent main surface 431 .

[0173] Specifically, when the insulating member 4 and the bracket 3 jointly wrap the active material coating portion 21, one of the two adjacent facets 432 can cover part of the other, at least a part of the main surface 431 can cover the outside of the two facets 432, or, at least a part of the two facets 432 can cover the outside of the main surface 431.

[0174] Whether the two facets 432 are arranged in an overlapping manner, or the facet 432 and the adjacent main face 431 are arranged in an overlapping manner, it can fully ensure that the entire insulating part 4 can be firmly matched with the bracket 3, so that the entire insulating part 4 and the bracket 3 can be matched and wrapped around the circumference of the active material coating part 21, thereby fully reducing the exposure of the active material coating part 21, reducing the risk of corrosion of the shell 11, and improving the stability and reliability of the battery cell 10.

[0175] Referring again to Figures 13 and 14, in some embodiments, when the insulating segment 430 is in the expanded state, the edge of the facet 432 adjacent to the main surface 431 is a beveled edge; and / or the edge of the main surface 431 adjacent to the facet 432 is a beveled edge. In other embodiments, the facet 432 is square, triangular, or trapezoidal, and the main surface 431 is correspondingly square, triangular, or trapezoidal.

[0176] That is to say, when the insulating part 4 is in the wrapped state, the edge of one end of the insulating section 430 in the length direction is retracted relative to the edge of the bracket 3, preventing the insulating section 430 from exceeding the edge of the bracket 3, thereby reducing the probability of the shell 11 scratching the edge of the insulating part 4.

[0177] The width of the main surface 431 may be equal to or different from the width of the facet 432 . For example, as shown in FIG. 14 , in this embodiment, the difference between the width of the facet 432 and the width of the main surface 431 is H, and H is greater than zero.

[0178] In some embodiments, a notch 44 is formed at the connection between the main insulating portion 41 and the first insulating portion 42; and / or a notch 44 is formed at the connection between the main insulating portion 41 and the second insulating portion 43. The notch 44 serves as a boundary structure between the main insulating portion 41 and the first insulating portion 42 / second insulating portion 43. The notch 44 can be formed after the insulating member 4 is manufactured by pressing using a notch machine or other equipment to reduce the thickness of the insulating member 4 at the notch 44. Alternatively, the notch 44 can be preformed during the manufacturing process of the insulating member 4.

[0179] In the above technical solution, on the one hand, by setting the notch 44, the insulating part 4 can be easily folded to smoothly wrap the active material coating part 21, which is beneficial to improving production and manufacturing efficiency and saving production and manufacturing costs; on the other hand, such a setting can reduce the error in the process of wrapping the insulating part 4 to the active material coating part 21, and can improve the accuracy and reliability of the wrapping of the insulating part 4 and the bracket 3, so as to further improve the stability and reliability of the battery cell 10.

[0180] Referring again to Figures 8 to 11 , to facilitate connection of the conductive portion 22 to the pole 12 from the side of the active material coating portion 21 closer to the bracket 3, in the embodiment of the present application, the bracket 3 is provided with a via 311. The conductive portion 22 passes through the via 311 and connects to the pole 12, thereby being connected to the pole 12 on the housing 11. The shape of the via 311 can be selected based on the shape of the conductive portion 22.

[0181] In the above technical solution, on the one hand, by providing a through hole 311 on the bracket 3, the bracket 3 can play the role of retracting and accommodating the conductive part 22, thereby facilitating the connection between the conductive part 22 and the pole 12, and improving the assembly reliability and convenience of the battery cell 10; on the other hand, the bracket 3 retracts the conductive part 22, which can eliminate the structure of the plastic parts in the original battery cell 10, and can achieve insulation between the entire battery cell assembly 2 and the shell 11 through the cooperation of the bracket 3 and the insulating part 4, which can effectively reduce the manufacturing and production costs.

[0182] In some embodiments of the present application, the bracket 3 may be an integral structure or a split structure. Please refer to Figure 18, which is a schematic structural diagram of the bracket 3 of the battery cell 10 in some embodiments of the present application. When the bracket 3 is an integral structure, the through hole 311 is formed in the form of a through hole that passes through the bracket 3. As a result, the bracket 3 with an integral structure is easy to process, and the reliability of the bracket 3 is better. It is also convenient to assemble the bracket 3 with the shell 11 and the pole 12, thereby improving assembly efficiency and matching stability. It is understandable that how the bracket 3 is processed can be specifically selected according to the material of the bracket 3. For example, when the bracket 3 is an insulating plastic part, the bracket 3 with an integral structure can be obtained by injection molding.

[0183] Please refer to Figure 19, which is a schematic structural diagram of the bracket 3 of the battery cell 10 in some other embodiments of the present application. When the bracket 3 is a split structure, the bracket 3 can include a first bracket 33 and a second bracket 34 formed separately, and a through hole 311 is defined between the first bracket 33 and the second bracket 34.

[0184] In the embodiment of the present application, the first bracket 33 and the second bracket 34 are both long, plate-like structures that can be detachably connected, for example, by plugging or snapping them together for easy assembly. Furthermore, the first bracket 33 has a semi-hole structure on one side near the second bracket 34, and the second bracket 34 also has another semi-hole structure of a matching shape near the first bracket 33. Together, the semi-hole structures of the first bracket 33 and the semi-hole structures of the second bracket 34 form an annular through-hole 311. That is, the through-hole 311 is defined between the first bracket 33 and the second bracket 34.

[0185] In the above technical solution, the through hole 311 is defined by the cooperation of the first bracket 33 and the second bracket 34. When the bracket 3 is assembled with the battery cell assembly 2, there is no need to pass the conductive part 22 from one end of the through hole 311 to the other end. Instead, the first bracket 33 and the second bracket 34 can be spliced ​​at the position of the conductive part 22 to clamp the conductive part 22, so that the through hole 311 surrounds the conductive part 22, which facilitates the assembly of the bracket 3 and the battery cell assembly 2 and improves the assembly efficiency.

[0186] As an optional solution, when the cross-section of the via 311 is long and strip-shaped, the first bracket 33 and the second bracket 34 are placed on both sides of the width direction of the via 311. For example, if the width direction of the via 311 is the left and right direction, the first bracket 33 and the second bracket 34 are located on the left and right sides of the via 311, which facilitates the cooperation between the first bracket 33, the second bracket 34 and the conductive part 22.

[0187] Please refer to Figure 20, which is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application. A receiving groove 393 is defined on the side of the bracket 3 facing away from the active material coating portion 21. This groove 393 communicates with the via 311 and accommodates at least a portion of the terminal 12. The shape of the groove 393 can match that of the terminal 12.

[0188] In the above technical solution, on the one hand, by accommodating at least part of the pole 12 through the accommodating groove 393, the structure of the entire battery cell 10 is made more compact and reliable, which is conducive to improving the energy density of the entire battery; on the other hand, through the setting of the accommodating groove 393, the pole 12 and part of the shell 11 can be insulated by the bracket 3 to further improve the stability and reliability of the battery cell 10; in addition, by accommodating the pole 12 through the accommodating groove 393, the stability and reliability of the pole 12 can also be improved, thereby ensuring the stability and reliability of the battery cell 10 during the charging and discharging process.

[0189] Please refer to Figure 21, which is a cross-sectional view of the structure of a battery cell bracket in some embodiments of the present application. A guide portion 32 is provided on the side of the bracket 3 facing away from the active material coating portion 21. The guide portion 32 is arranged around the circumference of the via 311 and extends toward the terminal 12.

[0190] In some embodiments, the guide portion 32 may be an annular boss extending along the circumference of the through hole 311. In other embodiments, the guide portion 32 may include two opposing boss structures, with the two boss structures located on opposite sides of the through hole 311. For example, the through hole 311 may be formed as an elongated hole, and the two boss structures may be disposed opposite each other in the width direction of the elongated hole, with each boss structure extending along the length of the elongated hole.

[0191] The conductive portion 22 passes through the through hole 311 , and the guide portion 32 can restrain, gather, and support the conductive portion 22 , thereby facilitating the connection between the conductive portion 22 and the terminal 12 , thereby improving the assembly efficiency and quality of the battery cell 10 .

[0192] Please refer to Figure 21 again. According to some embodiments of the present application, a guide groove 312 is formed on the side of the bracket 3 facing the active material coating portion 21. The guide groove 312 is connected to the via 311. The guide groove 312 accommodates at least part of the conductive portion 22. Along the direction of the bracket 3 pointing to the active material coating portion 21, the cross-sectional area of ​​the guide groove 312 gradually increases.

[0193] Specifically, the groove wall of the guide groove 312 can be a slope or arc surface extending from the inside to the outside toward the active material coating portion 21. The "inside" here refers to a position close to the center of the guide groove 312. On the contrary, the "outside" here refers to a position away from the center of the guide groove 312, that is, a position close to the edge of the guide groove 312.

[0194] The guide groove 312 can accommodate the conductive part 22 and avoid the conductive part 22 to avoid being crushed. It can also reduce the probability of the conductive part 22 becoming fluffy and folded, thereby reducing redundancy.

[0195] Please refer to Figures 22 and 23. Figure 22 is a top view of a battery cell bracket according to some embodiments of the present application. Figure 23 is a top view of a battery cell bracket according to other embodiments of the present application. The bracket 3 has at least one first liquid injection channel 392, which is located on the side of the bracket 3 facing the active material coating portion 21.

[0196] During injection, the electrolyte can flow along the first injection channel 392. This first injection channel 392 can increase the fluidity of the electrolyte, speed up the injection, and reduce the formation standstill time. Furthermore, the provision of the first injection channel 392 increases the contact area between the electrolyte and the active material coating portion 21, thereby reducing the problem of poor wetting of the active material coating portion 21.

[0197] Among them, at least one first liquid injection guide groove 392 is connected to the guide groove 312, and the electrolyte entering the shell 11 can flow along the first liquid injection guide groove 392 toward the guide groove 312, so that the electrolyte can flow to a predetermined position, further increasing the contact area between the electrolyte and the active material coating part 21.

[0198] Please refer to Figure 22 again. In an embodiment where the bracket 3 is an integrated structure and two poles 12 are provided on the shell 11, the two ends of the first liquid injection guide groove 392 can correspond to the positions of the two poles 12 respectively, and the two ends of the first liquid injection guide groove 392 are connected to the two guide grooves 312 respectively, and the electrolyte can flow along the first liquid injection guide groove 392 toward the two guide grooves 312.

[0199] Please refer to Figure 23 again. In an embodiment in which the bracket 3 is a split structure and two poles 12 are provided on the shell 11, the bracket 3 may include a separately formed first bracket 33 and a second bracket 34. A through hole 311 is defined between the first bracket 33 and the second bracket 34. At least one first liquid injection guide groove 392 is respectively provided on the first bracket 33 and the second bracket 34. The two ends of each first liquid injection guide groove 392 can respectively correspond to the positions of the two poles 12, and the two ends of the first liquid injection guide groove 392 are respectively connected to the two guide grooves 312, and the electrolyte can flow along the first liquid injection guide groove 392 toward the two guide grooves 312.

[0200] According to some embodiments of the present application, a second liquid injection guide groove (not shown) may be further provided on the bracket 3 as required, and the second liquid injection guide groove is located on the side of the bracket 3 facing away from the battery cell assembly 2. This arrangement allows the electrolyte to flow along the first liquid injection guide groove 392 and / or the second liquid injection guide groove during injection, thereby increasing the fluidity of the electrolyte, improving the injection speed, and reducing the formation static time.

[0201] It should be noted that in the embodiments of the present application, the depth of the first liquid injection guide groove 392 and / or the second liquid injection guide groove is greater than or equal to 0.1 mm. For example, the depth of the first liquid injection guide groove 392 and the second liquid injection guide groove can be 0.1 mm, 0.2 mm, 0.5 mm, etc., and can be selected according to actual needs.

[0202] Referring to Figures 24 and 25 , Figure 24 is a front view of a battery cell according to some embodiments of the present application. Figure 25 is a front view of a battery cell according to other embodiments of the present application. A retaining protrusion 38 is provided on one side of the bracket 3 , which engages with the battery cell assembly 2 .

[0203] For example, in the embodiment of the present application, the limiting protrusion 38 can be arranged around the circumference of the battery cell assembly 2 so that the limiting protrusion 38 is connected to the battery cell assembly 2. For another example, the limiting protrusion 38 can be held against the end of the battery cell assembly 2. For ease of understanding, the battery cell assembly 2 can be defined as having a first end 201 and a second end 202 that are relatively set, and the limiting protrusion 38 is stopped on the outside of the side wall of the battery cell assembly 2 near its first end 201. In the process of installing the battery cell assembly 2 with the bracket 3 into the shell 11, the first end 201 of the battery cell assembly 2 with the bracket 3 first enters the shell 11. As the assembly process proceeds, the first end 201 of the battery cell assembly 2 gradually moves away from the opening 1110 in the shell 11. During the assembly process, the limiting protrusion 38 is located between the side wall of the battery cell assembly 2 and the shell 11. After the battery cell assembly 2 and the bracket 3 are installed in place in the shell 11, the bracket 3 is located between the wall of the shell 11 opposite to its opening 1110 and the first end 201 of the battery cell assembly 2.

[0204] In this arrangement, the limiting protrusion 38 can restrain one end of the battery cell assembly 2, reduce the probability of the outer layer of the battery cell assembly 2 becoming fluffy, and also protect one end of the battery cell assembly 2, reducing the problem of one end of the battery cell assembly 2 touching the shell 11, thereby reducing the phenomenon of the shell 11 scratching the battery cell assembly 2 during the shell insertion process.

[0205] Referring again to FIG. 24 , the limiting protrusion 38 is formed as an annular protrusion that extends along the circumference of the battery cell assembly 2. In other words, the limiting protrusion 38 can be an integrated structure and sleeved on the outside of the battery cell assembly 2. In this way, the limiting protrusion 38 can constrain the battery cell assembly 2 in the circumferential direction of the battery cell assembly 2, more effectively reducing the probability of the outer layer of the battery cell assembly 2 becoming fluffy. It also protects one end of the battery cell assembly 2, reducing the problem of one end of the battery cell assembly 2 touching the housing 11, thereby reducing the possibility of the housing 11 scratching the battery cell assembly 2.

[0206] Please refer to Figure 25 again. In some embodiments, the limiting protrusion 38 can include multiple, and the multiple limiting protrusions 38 are arranged at intervals in the circumferential direction of the battery cell assembly 2, and there is a gap between two adjacent limiting protrusions 38. With this arrangement, the limiting protrusion 38 can not only restrain and protect the battery cell assembly 2, but also reduce materials and costs, and facilitate the assembly of the bracket 3 and the battery cell assembly 2.

[0207] Of course, the arrangement of the plurality of limiting protrusions 38 is not limited to the above situation, and can be selected according to actual needs.

[0208] The limiting protrusion 38 fits against the side wall of the cell assembly 2; alternatively, there is a gap between the limiting protrusion 38 and the side wall of the cell assembly 2. In other words, the limiting protrusion 38 may or may not contact the side wall of the cell assembly 2. The limiting protrusion 38 stops the side wall of the cell assembly 2 to reduce the possibility of the outer layer of the cell assembly 2 becoming fluffy. It also protects the side wall of the cell assembly 2 and reduces the problem of one end of the cell assembly 2 contacting the housing 11.

[0209] Please refer to Figure 26, which is a partial cross-sectional view of the battery cell 10 according to some embodiments of the present application. The surface of the retaining protrusion 38 facing the active material coating portion 21 may include a first surface 381. The first surface 381 mates with the sidewall of the active material coating portion 21. The first surface 381 can constrain the battery cell assembly 2 to reduce the likelihood of the outer layer of the active material coating portion 21 becoming fluffy. It also protects the sidewall of the active material coating portion 21, reducing the risk of one end of the active material coating portion 21 contacting the housing 11.

[0210] Please refer to Figure 27, which is a partial cross-sectional view of the battery cell 10 according to other embodiments of the present application. The surface of the position-limiting protrusion 38 facing the active material coating portion 21 may include a second surface 382. The distance between the second surface 382 and the active material coating portion 21 gradually increases along the direction from the bracket 3 toward the opening 1110. In other words, the second surface 382 extends obliquely away from the base of the position-limiting protrusion 38 and the sidewall of the active material coating portion 21. For example, the second surface 382 may be an inclined surface or a curved surface.

[0211] In this configuration, the second surface 382 can stop the side wall of the active material coating part 21 to reduce the probability of the outer layer of the active material coating part 21 becoming fluffy, and also protect the side wall of the active material coating part 21. In addition, the second surface 382 can play a guiding role, facilitate assembly, and improve the assembly efficiency of the battery cell assembly 2 and the bracket 3.

[0212] Please refer to Figure 28, which is a partial cross-sectional view of the battery cell 10 according to yet another embodiment of the present application. The surface of the position-limiting protrusion 38 facing the active material coating portion 21 may include a first surface 381 and a second surface 382. The first surface 381 is aligned with the sidewall of the active material coating portion 21, and the distance between the second surface 382 and the active material coating portion 21 gradually increases along the direction from the bracket 3 toward the opening 1110. The first surface 381 is located between the base of the position-limiting protrusion 38 and the second surface 382.

[0213] Specifically, the contour line of the first surface 381 can be a straight line extending vertically along the height direction of the bracket 3, and the contour line of the second surface 382 can be an oblique line inclined along the height direction of the bracket 3. Such a setting can not only play a good restraining role on the active material coating part 21, effectively reducing the probability of the outer layer of the active material coating part 21 becoming fluffy, but also facilitate assembly and improve the assembly efficiency of the battery cell assembly 2 and the bracket 3.

[0214] Please refer to Figure 29, which is a partial cross-sectional view of the battery cell structure of yet another embodiment of the present application. The side of the bracket 3 facing the battery cell assembly 2 has a clearance portion 391. The clearance portion 391 can avoid the edge of the battery cell assembly 2 facing the bracket 3, reducing the risk of the bracket 3 crushing the battery cell assembly 2.

[0215] Specifically, in the embodiment in which the bracket 3 has a limiting protrusion 38, when the bracket 3 is formed, a rounded corner structure may appear at the root of the limiting protrusion 38 on one side close to the center of the bracket 3. By providing a clearance portion 391, the rounded corner structure can be removed to prevent the rounded corner structure from crushing the outer edge of the battery cell assembly 2. The clearance portion 391 can be a groove opening toward the battery cell assembly 2. For example, the groove can be an annular groove. For another example, the groove can include multiple grooves arranged at intervals. The shape of the groove can be selected according to actual conditions. Of course, the clearance portion 391 can also be a clearance slope or a clearance arc surface that forms a clearance for the battery cell assembly 2. As long as the structure can form a clearance for the battery cell assembly 2, it falls within the scope of protection of the present application and is not specifically limited here. In other embodiments of the present application, the side of the bracket 3 facing the battery cell assembly 2 is in full contact with the battery cell assembly 2, that is, there is no clearance structure on the side of the bracket 3 facing the battery cell assembly 2.

[0216] Referring again to FIG. 20 , in the embodiment of the present application, the conductive portion 22 is connected to the side of the active material coating portion 21 near the bracket 3. The terminal 12 is provided with a receiving portion 121. At least a portion of the guide portion 32 extends into the receiving portion 121 to guide the conductive portion 22 to be received within the receiving portion 121, thereby facilitating electrical connection between the conductive portion 22 and the terminal 12. In other words, the terminal 12 is configured as a hollow structure.

[0217] Here, "at least partially" means that the conductive portion 22 can be completely accommodated within the accommodating portion 121, or only partially accommodated within the accommodating portion 121. Since the terminal 12 is provided with the accommodating portion 121, the hollow structure of the accommodating portion 121 can reduce the weight of the terminal 12 to a certain extent, thereby improving the weight energy density of the battery cell 10 and the battery 100. Furthermore, by providing the terminal 12 with a hollow structure and cooperating with the guide portion 32, the conductive portion 22 can be guided to connect with the terminal 12, thereby improving connection reliability and ensuring assembly efficiency and quality. Furthermore, the conductive portion 22 can be accommodated within the accommodating portion 121, which improves assembly efficiency and saves space occupied by the conductive portion 22, fully utilizing the space in the battery cell 10. This ensures a tighter and more reliable fit between the bracket 3 and the terminal 12, and between the bracket 3 and the conductive portion 22, making the battery cell 10 more compact and more conducive to improving the energy density of the battery cell 10.

[0218] More specifically, by partially or entirely containing the conductive portion 22 within the accommodating portion 121, the portion of the conductive portion 22 located within the accommodating portion 121 can occupy the space within the terminal 12, thereby reducing the space occupied by the conductive portion 22 within the housing 11. When the size of the housing 11 is fixed, some space can be saved within the housing 11 to accommodate a larger active material coating portion 21, thereby improving the volumetric energy density of the battery cell 10. For example, when the conductive portion 22 is extended from the side of the active material coating portion 21 close to the terminal 12, the space occupied by the conductive portion 22 between the active material coating portion 21 and the terminal 12 can be reduced, the size of the active material coating portion 21 in the direction in which the conductive portion 22 is extended can be increased, the distance between the active material coating portion 21 and the terminal 12 can be reduced, and the energy density of the battery cell 10 can be improved.

[0219] At the same time, by accommodating at least a portion of the conductive portion 22 within the accommodating portion 121, the space occupied by the battery cell 10 itself can be reduced, allowing a battery 100 of the same volume to accommodate a larger number of battery cells 10, and also improving the volumetric energy density of the battery 100. In addition, accommodating at least a portion of the conductive portion 22 within the accommodating portion 121 to occupy the space within the terminal 12 can, at least to a certain extent, reduce the redundancy of the conductive portion 22 within the housing 11, reduce the probability of short circuit between the conductive portion 22 and the active material coating portion 21, reduce the probability of short circuit in the battery cell 10, and improve the operating reliability and stability of the battery cell 10 and the battery 100. Secondly, accommodating at least a portion of the conductive portion 22 within the accommodating portion 121 can also stabilize and constrain the conductive portion 22 through the accommodating portion 121, so as to facilitate the orderly welding operation between the conductive portion 22 and the terminal 12.

[0220] It should be noted that, in the embodiment of the present application, the accommodation portion 121 may be located on the side of the pole 12 facing the active material coating portion 21 or on the side of the pole 12 facing away from the active material coating portion 21 .

[0221] For example, please refer to Figures 30 and 31. Figure 30 is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application. Figure 31 is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application. When the accommodating portion 121 is located on the side of the pole 12 facing the active material coating portion 21, the accommodating portion 121 includes a first accommodating groove 12110, and the surface of the pole 12 facing the active material coating portion 21 is the pole inner end face 122. The notch of the first accommodating groove 12110 is formed on the pole inner end face 122, and at least a portion of the conductive portion 22 is accommodated in the first accommodating groove 12110.

[0222] Exemplarily, the first receiving groove 12110 is a groove body, which is a groove-like structure with a certain depth. For example, when the pole 12 is disposed on the upper end wall of the housing 11 and the pole inner end surface 122 is the lower surface of the pole 12, the first receiving groove 12110 is formed as a receiving groove with a groove opening open downward and the groove wall recessed upward. For another example, when the pole 12 is disposed on the lower end wall of the housing 11 and the pole inner end surface 122 is the upper surface of the pole 12, the first receiving groove 12110 is formed as a receiving groove with a groove opening open upward and the groove wall recessed downward.

[0223] In the above technical solution, on the one hand, the first receiving groove 12110 provided on the terminal 12 can reduce the weight of the terminal 12 to a certain extent, thereby increasing the weight energy density of the battery cell 10 and the battery 100. On the other hand, because the notch of the first receiving groove 12110 is formed on the terminal inner end surface 122, which is the surface of the terminal 12 on the side close to the active material coating portion 21, the first receiving groove 12110 can be opened toward the active material coating portion 21, thereby facilitating the insertion of the conductive portion 22 into the first receiving groove 12110 and improving assembly efficiency. Furthermore, this type of first receiving groove 12110 is easier to process, improving production efficiency.

[0224] Moreover, the first receiving groove 12110 can be easily processed to have a larger volume, which can accommodate more conductive parts 22; at the same time, since the first receiving groove 12110 is open toward the active material coating part 21, the first receiving groove 12110 can also serve as a buffer and temporary storage structure for the electrolyte, so that more electrolyte can be accommodated in the shell 11. Since the battery cell 10 will lose electrolyte during the charging and discharging process, when there is more electrolyte, the service life of the battery cell 10 can be extended; and also because the first receiving groove 12110 is open toward the active material coating part 21, the first receiving groove 12110 can also serve as a storage and buffer structure for gas production inside the battery cell assembly 2, reducing the expansion of the battery cell 10 and improving the reliability and stability of the battery cell 10.

[0225] In addition, since the first receiving groove 12110 is located on the inner side of the pole 12, external foreign matter and impurities are not easy to enter the first receiving groove 12110, which can reduce the impact of external foreign matter and impurities on the battery cell assembly 2, and improve the stability and reliability of the battery cell assembly 2, thereby improving the stability and reliability of the battery cell 10 and the battery 100.

[0226] Referring again to FIG. 30 , in the embodiment of the present application, the connection method between the pole 12 and the housing 11 is not limited, and can be, for example, welding or riveting. For example, when the two are riveted, the housing 11 has a mounting hole 113, and the pole 12 is riveted to the mounting hole 113. Of course, it is understood that when the two are welded or otherwise coupled, the housing 11 may also have a mounting hole 113 to facilitate the mounting of the pole 12 to the housing 11 through the mounting hole 113, and this is not limited here.

[0227] At the same time, the first accommodating groove 12110 can be set corresponding to the position of the mounting hole 113, or in other words, on the projection plane perpendicular to the axial direction R of the pole 12, the orthographic projection of the first accommodating groove 12110 is located within the orthographic projection range of the mounting hole 113, so that the first accommodating groove 12110 can have a larger depth to accommodate more conductive parts 22, thereby reducing the space occupied by the conductive parts 22 in the shell 11 to a greater extent.

[0228] Specifically, when the housing 11 is provided with a mounting hole 113 and the pole 12 is mounted in the mounting hole 113 , along the axial direction R of the pole 12 , the depth H1 of the first accommodating groove 12110 is greater than or equal to the minimum distance H2 from the inner end surface 122 of the pole to the mounting hole 113 .

[0229] It should be noted that the specific shape of the first receiving groove 12110 is not limited and can be regular or irregular, such as a cylindrical groove with a rectangular, elliptical, or racetrack-shaped cross-section, a trapezoidal groove with a rectangular cross-section and gradually changing cross-sectional dimensions, a hemispherical groove with a circular cross-section and gradually changing cross-sectional dimensions, or a hemispherical groove with an elliptical cross-section and gradually changing cross-sectional dimensions, etc. Therefore, the depth H1 of the first receiving groove 12110 refers to the maximum depth of the first receiving groove 12110 along the axial direction R of the pole 12.

[0230] Since in the axial direction R of the pole 12, the depth H1 of the first accommodating groove 12110 is greater than or equal to the minimum distance H2 from the inner end face 122 of the pole to the mounting hole 113, the volume of the pole 12 can be fully utilized, so that the first accommodating groove 12110 has a larger depth, which is conducive to accommodating more conductive parts 22, and thus can greatly reduce the space occupied by the conductive parts 22 in the shell 11, further improve the energy density of the battery cell 10, and further reduce the redundancy of the conductive parts 22 in the shell 11; at the same time, since the first accommodating groove 12110 has a larger depth, it can also accommodate the gas production of the battery cell assembly 2, ensure the reliability and stability of the battery cell 10, and can also accommodate more electrolyte to ensure the service life of the battery cell 10.

[0231] Please refer to Figures 30 and 31 again. In order to ensure the stability and reliability of the electrical connection between the active material coating portion 21 and the pole 12, in some embodiments of the present application, the electrical connection position between the conductive portion 22 and the pole 12 can be located on the groove wall of the first accommodating groove 12110 formed by the accommodating portion 121.

[0232] Exemplarily, the conductive part 22 and the pole 12 can be electrically connected by welding, and the electrical connection position is the welding position of the conductive part 22 and the pole 12. At the same time, the welding method of the conductive part 22 and the pole 12 is not limited, for example, it can be laser welding, and according to factors such as the position, angle, or structure of the welding part, vertical welding, inclined welding, lap welding, or edge welding can be selected. In other embodiments of the present application, the conductive part 22 and the pole 12 can also be electrically connected by other means instead of welding, such as by providing conductive glue or conductive nails. To simplify the description, the following text will take the case where the conductive part 22 and the pole 12 are welded to form an electrical connection, and the welding position is the electrical connection position of the conductive part 22 and the pole 12 as an example for introduction.

[0233] Specifically, the electrode 12 includes a first end wall 12111 and a first side wall 12113. The first end wall 12111 is located on a side of the first side wall 12113 away from the active material coating portion 21. The first end wall 12111 and the first side wall 12113 enclose a first receiving groove 12110. The electrical connection position between the conductive portion 22 and the electrode 12 is located on the first end wall 12111 and / or the first side wall 12113. In other words, the conductive portion 22 can be welded to at least one of the first end wall 12111 and the first side wall 12113.

[0234] In the above technical solution, by arranging the electrical connection position between the conductive portion 22 and the terminal 12 on at least one of the first end wall 12111 and the first side wall 12113, the first receiving groove 12110 not only serves to accommodate at least a portion of the conductive portion 22, but the groove wall of the first receiving groove 12110 also serves to establish an electrical connection with the conductive portion 22. This simplifies the structure of the terminal 12, facilitates the processing of the terminal 12, simplifies the structure of the conductive portion 22, reduces redundancy in the conductive portion 22, and reduces the cost of the conductive portion 22. Furthermore, by utilizing the groove wall of the first receiving groove 12110 to establish an electrical connection with the conductive portion 22, the area where the conductive portion 22 is electrically connected to the terminal 12 can be set relatively large, which not only reduces the difficulty of electrical connection, but also improves the reliability and stability of the electrical connection, thereby improving the performance of the battery cell 10.

[0235] In addition, since the electrical connection position between the conductive part 22 and the pole 12 is located in the first receiving groove 12110, it can not only prevent the electrical connection position from protruding from the outside of the pole 12 and occupying the space outside the pole 12, but also enable the electrical connection position to be protected by the pole 12, thereby improving the reliability and stability of the electrical connection between the conductive part 22 and the pole 12.

[0236] In addition, in an embodiment of the present application, the first end wall 12111 is constructed as a closed structure without any perforations, so that the first receiving tank 12110 is isolated from the external space of the shell 11, thereby avoiding the problem of the electrolyte in the shell 11 leaking from the first receiving tank 12110.

[0237] Referring again to Figures 30 and 31 , in some optional embodiments, the shape of a portion of the conductive portion 22 matches the shape of a portion of the first end wall 12111, and the conductive portion 22 is positioned in a manner that conforms to the shape of the first end wall 12111 and is electrically connected thereto, such that the portion where the conductive portion 22 is electrically connected to the first end wall 12111 extends along the length or width of the first end wall 12111. For example, when the first end wall 12111 is planar, a portion of the conductive portion 22 can also be planar and conform to the first end wall 12111, and an electrical connection, such as welding, can be made at the conforming portion. This can increase the area of ​​the electrical connection, improving the reliability and stability of the electrical connection.

[0238] In addition, when the electrical connection between the conductive part 22 and the first end wall 12111 is welding, since the first end wall 12111 is located on the side of the first receiving groove 12110 away from the active material coating part 21, it is convenient to perform welding operations. For example, welding can be performed from the side of the pole 12 away from the active material coating part 21.

[0239] It is worth noting that the shape of the first end wall 12111 is not limited, and can be, for example, a flat plate, an arc-shaped plate, etc. Specifically, when the first end wall 12111 is a flat plate structure, the first end wall 12111 is arranged at an angle to the axial direction R of the pole 12. For example, the first end wall 12111 can be a flat plate structure perpendicular to the axial direction R of the pole 12, or can be an inclined plate structure that is not perpendicular to the axial direction R of the pole 12, but the inclination direction is not limited.

[0240] Of course, in other embodiments of the present application, the position where the conductive part 22 is electrically connected to the first end wall 12111 may not extend along the length or width direction of the first end wall 12111. For example, it may be a plurality of discretely arranged points. For example, the conductive part 22 has a plurality of spaced-apart parts that are respectively welded to the first end wall 12111, which will not be elaborated here.

[0241] Please refer to Figure 32, which is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application. When the conductive portion 22 is electrically connected to the first end wall 12111, a first sinking groove 12112 can be provided on the first end wall 12111, and the sinking direction of the first sinking groove 12112 is the direction away from the active material coating portion 21. At least a portion of the position where the conductive portion 22 is electrically connected to the first end wall 12111 is located within the first sinking groove 12112. For example, at least a portion of the conductive portion 22 can be provided within the first sinking groove 12112 and connected to the portion of the first end wall 12111 that is used to define the first sinking groove 12112.

[0242] In the above technical solution, on the one hand, the first sinking groove 12112 can be used to realize pre-positioning and limiting of the electrical connection position of the conductive part 22, which is not only conducive to finding the correct position to realize electrical connection and improve production efficiency, but also helps to improve the stability and reliability of the conductive part 22, and ensure the stability and reliability of the battery cell 10 during the charging and discharging process; on the other hand, by arranging the first sinking groove 12112 on the first end wall 12111, the local wall thickness of the first end wall 12111 can be locally thinned, which is not only conducive to welding, but also helps to reduce the weight of the pole 12 and improve the weight energy density of the battery cell 10.

[0243] Please refer to Figures 31 and 32 again. In the embodiment of the present application, the pole 12 can also be provided with a first groove 126 as required. The first groove 126 is located on the side of the pole 12 away from the active material coating portion 21, that is, the surface of the side of the pole 12 away from the active material coating portion 21 is the pole outer end face 123, and the notch of the first groove 126 is formed on the pole outer end face 123.

[0244] It is understood that the first groove 126 is a groove body, which is a groove-like structure with a certain depth. Furthermore, when the pole 12 is arranged on the upper end wall of the housing 11 and the pole outer end surface 123 is the upper surface of the pole 12, the first groove 126 is formed as a first groove with a groove opening open upward and the groove wall recessed downward (i.e., recessed toward the square near the battery cell assembly 2). For another example, when the pole 12 is arranged on the lower end wall of the housing 11 and the pole outer end surface 123 is the lower surface of the pole 12, the first groove 126 is formed as a first groove with a groove opening open downward and the groove wall recessed upward (i.e., recessed toward the square away from the battery cell assembly 2).

[0245] In the above technical solution, on the one hand, since the terminal 12 is provided with the first groove 126, the weight of the terminal 12 can be further reduced, so as to improve the weight energy density of the battery cell 10 and the battery 100; on the other hand, the first groove 126 is located on the outside of the terminal 12, that is, it is open to the side of the terminal 12 away from the interior of the shell 11. The first groove 126 can be used to accommodate or install structural components in the battery 100 that electrically connect the various battery cells 10, so as to make full use of the space inside the terminal 12 and improve the space utilization and volume energy density of the battery 100.

[0246] In addition, since the terminal 12 has both the first receiving groove 12110 and the first groove 126, the first groove 126 is located on the side of the first receiving groove 12110 away from the active material coating portion 21, and the first groove 126 is open in a direction away from the first receiving groove 12110. This facilitates laser welding of the conductive portion 22 to the first end wall 12111 through the first groove 126 from the outside of the terminal 12, that is, the side of the terminal 12 away from the active material coating portion 21, thereby facilitating electrical connection between the conductive portion 22 and the terminal 12 through external welding. In other words, the above-mentioned structural arrangement facilitates external welding of the terminal 12 and the conductive portion 22 through the first groove 126, facilitates the processing and manufacturing of the battery cell 10, and can save processing and manufacturing costs.

[0247] Furthermore, in order to conveniently and effectively weld the conductive part 22 to the groove wall of the first receiving groove 12110 through the first groove 126, and improve the welding reliability of the conductive part 22 to the groove wall of the first receiving groove 12110, in an embodiment of the present application, the part between the first groove 126 and the first receiving groove 12110 can be laser welded to the conductive part 22, that is, the spacer part 127 shown in Figure 32 is laser welded to the conductive part 22, so as to realize the electrical connection between the battery cell assembly 2 and the pole 12. The thickness of the spacer 127 of the pole 12 located between the first groove 126 and the first receiving groove 12110 is relatively thin. The spacer 127 isolates the first groove 126 and the first receiving groove 12110. The side wall of the spacer 127 close to the active material coating part 21 can be used as the first end wall 12111. When the conductive part 22 needs to be welded to the first end wall 12111, since the thickness of the spacer 127 is relatively thin, it is conducive to welding the conductive part 22 and the first end wall 12111 through the first groove 126, thereby improving the convenience and reliability of welding.

[0248] In some embodiments, the first receiving groove 12110 can be configured with a cross-sectional shape whose length is greater than its width, such as a rectangle, an ellipse, a racetrack, or the like. The weld mark formed by welding the conductive portion 22 to the electrode 12 can be a long, strip-shaped weld mark parallel to the length of the first receiving groove 12110, thereby improving welding reliability and enhancing current flow performance. For example, when the weld mark formed by welding the conductive portion 22 to the first end wall 12111 is a long, strip-shaped weld mark, the width of the weld mark can be greater than or equal to 6 mm, and the distance between the weld mark and the first side wall 12113 can be greater than or equal to 1 mm, thereby ensuring welding convenience and reliability while also ensuring the current flow capacity of the battery cell 10.

[0249] Please refer to FIG. 31 again. Furthermore, the battery cell 10 may further include a slot cover 7 . The slot cover 7 is disposed on the terminal post 12 and covers the notch of the first groove 126 .

[0250] In the above technical solution, by providing a slot cover 7 that covers the first groove 126, the terminal 12 can achieve indirect electrical connection with the busbar through the slot cover 7. By adjusting the position and structure of the slot cover 7, the electrical connection between the slot cover 7 and the busbar is more convenient and the electrical connection area is larger. Therefore, the provision of the slot cover 7 facilitates the electrical connection between adjacent battery cells 10 in the battery 100. Since the location where the battery cells 10 are electrically connected to each other is located on the slot cover 7, it is separated from the electrical connection location between the conductive portion 22 and the terminal 12 by the first groove 126, reducing interference between the two and further improving the stability and reliability of the battery cells 10.

[0251] For example, please refer to Figure 33, which is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application. The accommodating portion 121 can also be configured to include a second accommodating groove 12120. The surface of the pole 12 away from the active material coating portion 21 is the pole outer end face 123. The notch of the second accommodating groove 12120 is formed on the pole outer end face 123. The second accommodating groove 12120 is connected to the interior of the shell 11 through the through hole 12130. The conductive portion 22 is passed through the through hole 12130 and is at least partially accommodated in the second accommodating groove 12120.

[0252] It is understood that the second receiving groove 12120 is a groove body, which is a groove-like structure with a certain depth. For example, when the pole 12 is disposed on the upper end wall of the housing 11 and the pole outer end surface 123 is the upper surface of the pole 12, the second receiving groove 12120 is formed as a receiving groove with an upwardly open groove opening and a downwardly recessed groove wall. For another example, when the pole 12 is disposed on the lower end wall of the housing 11 and the pole outer end surface 123 is the lower surface of the pole 12, the second receiving groove 12120 is formed as a receiving groove with a downwardly open groove opening and an upwardly recessed groove wall.

[0253] In the above technical solution, please refer to Figure 33 again. On the one hand, the pole 12 is provided with a second receiving groove 12120, which can reduce the weight of the pole 12 to a certain extent, so as to improve the weight energy density of the battery cell 10 and the battery 100; on the other hand, since the notch of the second receiving groove 12120 is formed on the outer end face 123 of the pole, and the outer end face 123 of the pole is the surface of the pole 12 away from the active material coating part 21, the second receiving groove 12120 can be open in the direction away from the active material coating part 21. In this way, when at least part of the conductive part 22 is accommodated in the second receiving groove 12120, the conductive part 22 can be easily stored and sorted through the notch of the second receiving groove 12120, and the electrical connection operation between the conductive part 22 and the pole 12 can be easily achieved through the notch of the second receiving groove 12120, thereby reducing the production difficulty of the battery cell 10 and improving the production efficiency of the battery cell 10.

[0254] At the same time, since the second receiving tank 12120 can be connected to the interior of the shell 11 through the perforation 12130, the second receiving tank 12120 can also serve as a buffer and temporary storage structure for the electrolyte, so that more electrolyte can be accommodated in the shell 11. Since the battery cell 10 will lose electrolyte during the charging and discharging process, when there is more electrolyte, the service life of the battery cell 10 can be extended; and because the second receiving tank 12120 can be connected to the interior of the shell 11 through the perforation 12130, the second receiving tank 12120 can also serve as a receiving and buffer structure for gas production inside the battery cell assembly 2, reducing the expansion of the battery cell 10 and improving the reliability and stability of the battery cell 10.

[0255] It is worth noting that when the accommodation portion 121 has the second accommodation groove 12120 and the conductive portion 22 is disposed in the through hole 12130 and is at least partially accommodated in the second accommodation groove 12120 , the electrical connection position between the conductive portion 22 and the pole 12 is not limited.

[0256] Exemplarily, when the conductive portion 22 is passed through the through-hole 12130 and is at least partially accommodated in the second accommodating groove 12120 , in an embodiment of the present application, the electrical connection position between the conductive portion 22 and the pole 12 is located at the hole wall of the through-hole 12130 formed by the pole 12 .

[0257] In the above technical solution, by setting the electrical connection position between the conductive part 22 and the pole 12 on the hole wall of the through-hole 12130, it is convenient to electrically connect the conductive part 22 and the pole 12 through the second accommodating groove 12120, and when the electrical connection area between the conductive part 22 and the pole 12 is large, the electrical connection between the conductive part 22 and the pole 12 can be used to achieve the sealing of the through-hole 12130, so as to save sealing costs, reduce electrolyte leakage, and save sealing parts.

[0258] Specifically, the conductive part 22 can be welded to the hole wall of the through-hole 12130 at the position where the through-hole 12130 is connected to the second receiving groove 12120, which is convenient for operation. In addition, the through-hole 12130 can be sealed by controlling the weld mark and utilizing the weld mark and the conductive part 22 to improve the problem of electrolyte in the shell 11 leaking from the through-hole 12130.

[0259] As another example, when the conductive portion 22 is provided through the through-hole 12130 and is at least partially accommodated in the second receiving groove 12120, in other embodiments of the present application, the electrical connection position between the conductive portion 22 and the pole 12 may also be located on the groove wall of the second receiving groove 12120 formed by the pole 12. This facilitates the electrical connection operation. For example, when the conductive portion 22 is welded to the groove wall of the second receiving groove 12120 formed by the pole 12, the conductive particles generated by the welding can be prevented from entering the housing 11 and causing problems such as a short circuit.

[0260] Please refer to Figure 33 again. The pole 12 includes a second end wall 12121 and a second side wall 12123. The second end wall 12121 is located on the side of the second side wall 12123 close to the active material coating portion 21. The second end wall 12121 and the second side wall 12123 are arranged to form a second receiving groove 12120. The through hole 12130 is opened on the second end wall 12121. The electrical connection position between the conductive portion 22 and the pole 12 is located on the second end wall 12121 and / or on the second side wall 12123.

[0261] More specifically, the conductive portion 22 and the pole 12 can be electrically connected by welding, so the welding position is the electrical connection position between the conductive portion 22 and the pole 12. In other embodiments of the present application, the conductive portion 22 and the pole 12 can also be electrically connected by other methods instead of welding, such as by providing conductive glue or conductive nails, which will not be described in detail here.

[0262] To simplify the description, the following description uses the example of welding the conductive portion 22 to the pole 12 to form an electrical connection, where the welding location is the electrical connection location between the conductive portion 22 and the pole 12. For example, in some embodiments, the electrical connection location between the conductive portion 22 and the pole 12 is located at the second end wall 12121 and / or the second side wall 12123, and the conductive portion 22 may be welded to at least one of the second end wall 12121 and the second side wall 12123.

[0263] In the above technical solution, by locating the electrical connection point between the conductive portion 22 and the terminal 12 on at least one of the second end wall 12121 and the second side wall 12123, the second receiving groove 12120 not only accommodates at least part of the conductive portion 22, but also the groove wall of the second receiving groove 12120 also functions to achieve electrical connection with the conductive portion 22. This simplifies the structure of the terminal 12 and facilitates the processing of the terminal 12. Furthermore, because the through-hole 12130 is provided in the second end wall 12121, the conductive portion 22 can easily extend into the second receiving groove 12120 through the through-hole 12130, simplifying the structure of the conductive portion 22, reducing redundancy in the conductive portion 22, and lowering the cost of the conductive portion 22. Moreover, the opening direction of the slot of the second receiving groove 12120 makes it easy to electrically connect the conductive part 22 with the slot wall of the second receiving groove 12120 through the slot of the second receiving groove 12120, which can reduce the difficulty of electrical connection. Moreover, by utilizing the slot wall of the second receiving groove 12120 to achieve electrical connection with the conductive part 22, the area where the conductive part 22 is electrically connected to the pole 12 can be relatively large, which can improve the reliability and stability of the electrical connection, thereby improving the performance of the battery cell 10.

[0264] In addition, since the electrical connection position between the conductive part 22 and the pole 12 is located in the second receiving groove 12120, it can not only prevent the electrical connection position from protruding from the outside of the pole 12 and occupying the space outside the pole 12, but also enable the electrical connection position to be protected by the pole 12, thereby improving the reliability and stability of the electrical connection between the conductive part 22 and the pole 12.

[0265] Referring again to FIG. 33 , in some embodiments, the shape of a portion of the conductive portion 22 matches the shape of a portion of the second end wall 12121, and the conductive portion 22 is positioned to fit and electrically connect to the second end wall 12121, such that the portion where the conductive portion 22 is electrically connected to the second end wall 12121 extends along the length or width of the second end wall 12121. For example, if the second end wall 12121 is planar, a portion of the conductive portion 22 can also be planar and fit to the second end wall 12121, and an electrical connection, such as welding, can be made at the fitting portion. This can increase the area of ​​the electrical connection, improving the reliability and stability of the electrical connection.

[0266] It is worth noting that the shape of the second end wall 12121 is not limited, and can be, for example, a flat plate or an arc-shaped plate structure. When the second end wall 12121 is a flat plate structure, it is arranged at an angle to the axial direction R of the pole 12. For example, it can be a flat plate structure perpendicular to the axial direction R of the pole 12, or it can be an inclined flat plate structure that is not perpendicular to the axial direction R of the pole 12, but the inclination direction is not limited.

[0267] For example, referring again to FIG. 33 , when the second end wall 12121 is a flat plate, the angle θ between the second end wall 12121 and the axial direction R of the electrode 12 is equal to 90°. That is, along the direction from the through-hole 12130 to the second side wall 12123, the second end wall 12121 is equidistant from the active material coating portion 21. This facilitates welding of the conductive portion 22 to the second end wall 12121.

[0268] For another example, the angle θ between the second end wall 12121 and the axial direction R of the pole 12 is greater than 90°, that is, along the direction from the through-hole 12130 to the second side wall 12123, the second end wall 12121 extends obliquely toward the direction close to the active material coating portion 21. As a result, the extension distance of the conductive portion 22 along the second end wall 12121 can be increased to increase the reliability of the electrical connection. Exemplarily, the angle θ between the second end wall 12121 and the axial direction R of the pole 12 can be 90°-145°, such as 100°, 110°, 120°, 130°, 140°, etc. On the one hand, this can make the second end wall 12121 easy to process and convenient for electrical connection with the conductive portion 22, and on the other hand, it can more fully utilize the space inside the pole 12 to accommodate the conductive portion 22.

[0269] For another example, the angle θ between the second end wall 12121 and the axial direction R of the pole 12 is less than 90°, that is, along the direction from the through-hole 12130 to the second side wall 12123, the second end wall 12121 extends obliquely in the direction away from the active material coating portion 21. As a result, the extension distance of the conductive portion 22 along the second end wall 12121 can be increased to increase the reliability of the electrical connection. Exemplarily, the angle θ between the second end wall 12121 and the axial direction R of the pole 12 can be 45°-90°, such as 50°, 60°, 70°, 80°, etc. On the one hand, this can make the second end wall 12121 easy to process and convenient for electrical connection with the conductive portion 22, and on the other hand, it can make more full use of the space inside the pole 12 to accommodate the conductive portion 22.

[0270] Of course, the present application is not limited to this. In other embodiments of the present application, the position where the conductive part 22 is electrically connected to the second end wall 12121 may not extend along the length or width direction of the second end wall 12121. It may also be a plurality of discretely arranged points. For example, the conductive part 22 has a plurality of spaced-apart parts that are respectively welded to the second end wall 12121, which will not be elaborated here.

[0271] Please refer again to Figure 33 and further to Figure 34, which is a schematic partial cross-sectional view of a battery cell provided in some embodiments of the present application. Regardless of the specific value of the angle θ between the second end wall 12121 and the axial direction R of the terminal 12, in the embodiments of the present application, when the conductive portion 22 is electrically connected to the second end wall 12121, a second recess 12122 can be provided on the second end wall 12121 as required. The second recess 12122 is a groove formed by a portion of the second end wall 12121 that is sunken toward the end closest to the active material coating portion. The location where the conductive portion 22 is electrically connected to the second end wall 12121 is at least partially located within the second recess 12122.

[0272] In the above technical solution, the portion of the conductive part 22 located in the second groove 12122 is set to match the shape of the second groove 12122, and is fitted to achieve electrical connection. The second groove 12122 can be used to pre-position and limit the electrical connection position of the conductive part 22, which is conducive to finding the correct position to achieve electrical connection, improve production efficiency, and improve the stability and reliability of the electrical connection position, so as to ensure the reliability and stability of the charging and discharging operations of the battery cell 10.

[0273] Referring again to FIG. 34 , in the embodiment of the present application, the connection method between the pole 12 and the housing 11 is not limited, and can be welding or riveting. For example, when the two are riveted, the housing 11 has a mounting hole 113, and the pole 12 is riveted to the mounting hole 113. Of course, it is understood that when the two are welded or otherwise coupled, the housing 11 may also have a mounting hole 113, and the pole 12 may be mounted to the mounting hole 113.

[0274] Optionally, referring to Figure 33 again, the second accommodating groove 12120 can be set corresponding to the position of the mounting hole 113, or in other words, on the projection plane perpendicular to the axial direction R of the pole 12, the orthographic projection of the second accommodating groove 12120 is located within the orthographic projection range of the mounting hole 113, so that the second accommodating groove 12120 can have a larger depth to accommodate more conductive parts 22, thereby reducing the space occupied by the conductive parts 22 in the shell 11 to a greater extent.

[0275] In some embodiments, referring again to FIG. 33 , when the housing 11 has a mounting hole 113 and the pole 12 is mounted in the mounting hole 113 , along the axial direction R of the pole 12 , the depth H3 of the second accommodating groove 12120 is greater than or equal to the minimum distance H4 from the outer end surface 123 of the pole to the mounting hole 113 .

[0276] It should be noted that the specific shape of the second receiving groove 12120 is not limited and can be regular or irregular, such as a cylindrical groove with a rectangular, elliptical, or racetrack-shaped cross-section, a trapezoidal groove with a rectangular cross-section and gradually changing cross-sectional dimensions, a hemispherical groove with a circular cross-section and gradually changing cross-sectional dimensions, or a hemispherical groove with an elliptical cross-section and gradually changing cross-sectional dimensions, etc. It is worth noting that the racetrack shape described herein refers to a shape in which the two short sides of a rectangle are replaced by convex curves.

[0277] Therefore, the depth H3 of the second receiving groove 12120 refers to the maximum depth of the second receiving groove 12120 along the axial direction R of the pole 12. Since the depth H3 of the second receiving groove 12120 is greater than or equal to the minimum distance H4 between the pole outer end surface 123 and the mounting hole 113 in the axial direction R of the pole 12, the volume of the pole 12 can be fully utilized, so that the second receiving groove 12120 has a greater depth, which is conducive to accommodating more conductive parts 22, thereby greatly reducing the space occupied by the conductive parts 22 in the housing 11, further improving the energy density of the battery cell 10, and further reducing the redundancy of the conductive parts 22 in the housing 11. At the same time, since the second receiving groove 12120 has a greater depth, it can also accommodate gas generation of the battery cell assembly 2, ensuring the reliability and stability of the battery cell 10, and can also accommodate more electrolyte to ensure the service life of the battery cell 10.

[0278] Please refer to Figure 34, and further refer to Figures 35 and 36. Figure 35 is a partial cross-sectional schematic diagram of the battery cell 10 provided in some embodiments of the present application, and Figure 36 is a structural explosion diagram of the battery cell 10 shown in Figure 35. In the embodiments of the present application, when the accommodating portion 121 has the second accommodating groove 12120 of any of the above embodiments, optionally, the battery cell 10 may further include a first cover plate 13, the first cover plate 13 cooperates with the pole 12, and closes the notch of the second accommodating groove 12120, and the first cover plate 13 is electrically connected to the pole 12.

[0279] In the above technical solution, by providing the first cover plate 13 to close the notch of the second receiving tank 12120, the electrolyte in the shell 11 can be prevented from leaking from the notch of the second receiving tank 12120. Moreover, since the first cover plate 13 closes the notch of the second receiving tank 12120 and is electrically connected to the pole 12, the first cover plate 13 can be used to easily realize the indirect electrical connection between the pole 12 and the busbar component, and it is beneficial to increase the connection area of ​​the electrical connection, thereby helping to reduce the resistance of the electrical connection.

[0280] It is worth noting that the manner and position of engagement between the first cover plate 13 and the terminal 12 are not limited, as long as the first cover plate 13 can seal the notch of the second receiving slot 12120. For example, in some embodiments, the first cover plate 13 can be welded to the terminal 12. During processing, the conductive portion 22 can first be passed through the through-hole 12130 and welded to the wall of the second receiving slot 12120. The first cover plate 13 and the terminal 12 are then welded to seal the notch of the second receiving slot 12120.

[0281] It should also be noted that the specific structure of the first cover plate 13 is not limited. For example, in some optional embodiments, FIG37 is an exploded view of the structure of the first cover plate shown in FIG36 , and referring to FIG35-37 , the first cover plate 13 includes a first conductive member 131 and a second conductive member 132 made of different materials. The first conductive member 131 is engaged with and electrically connected to the pole 12, and the second conductive member 132 is engaged with and electrically connected to the first conductive member 131.

[0282] In the above technical solution, the first cover plate 13 is configured as a composite form, and the first conductive member 131 is configured to be made of the same material as the pole 12, thereby facilitating electrical connection between the first conductive member 131 and the pole 12. For example, the first conductive member 131 can be easily and stably connected to the pole 12 through welding. In addition, because the second conductive member 132 is made of a different material from the first conductive member 131, it is convenient to use the second conductive member 132 to electrically connect to a busbar component made of a different material from the pole 12. For example, the second conductive member 132 can be easily and stably connected to a busbar component made of the same material as the second conductive member 132 through welding.

[0283] For example, when the electrode 12 is a negative electrode, the electrode 12 is a copper electrode, and the current collector is an aluminum sheet, the first conductive member 131 can be made of copper and the second conductive member 132 can be made of aluminum. This allows the electrode 12 and the first conductive member 131 to be made of the same material and to be effectively welded. Furthermore, the second conductive member 132 and the current collector are made of the same material and to be effectively welded. This effectively achieves indirect electrical connection between the electrode 12 and the current collector through the first cover 13. Furthermore, the copper-to-copper welding of the electrode 12 and the first conductive member 131 provides good fluidity and is less prone to cracking, which helps improve the sealing effect of the weld.

[0284] Referring again to Figures 35-37, in some optional examples, the first conductive member 131 is located between the second receiving groove 12120 and the second conductive member 132. In the above technical solution, since the first conductive member 131 is located between the second receiving groove 12120 and the second conductive member 132, it can separate the second receiving groove 12120 and the second conductive member 132. Therefore, when the electrolyte in the housing 11 enters the second receiving groove 12120 through the through-hole 12130, the first conductive member 131 can prevent this portion of the electrolyte from contacting the second conductive member 132, thereby preventing the electrolyte from leaking circumferentially from the second conductive member 132.

[0285] It is worth noting that the coupling method between the first conductive member 131 and the second conductive member 132 is not limited. For example, in some embodiments, referring to Figures 35-37, the first conductive member 131 has a second groove 1311, and the second conductive member 132 is embedded in the second groove 1311. The notch of the second groove 1311 is formed on the surface of the first conductive member 131 away from the second receiving slot 12120, so that the second conductive member 132 is exposed through the notch of the second groove 1311. Alternatively, in other embodiments, the connection method between the first conductive member 131 and the second conductive member 132 can also be a fastening connection, a snap connection, etc.

[0286] It should also be noted that the "exposed" of the second conductive member 132 by the notch of the second groove 1311 means that the first conductive member 131 does not block the second conductive member 132 at the notch position of the second groove 1311, and the second conductive member 132 is not required to protrude from the notch of the second groove 1311. For example, the second conductive member 132 can be flush with the surface of the first conductive member 131 on the side away from the second accommodating groove 12120, or the second conductive member 132 can protrude from the surface of the first conductive member 131 on the side away from the second accommodating groove 12120.

[0287] In the above technical solution, on the one hand, by embedding the second conductive member 132 within the first conductive member 131, the difficulty of assembling the first and second conductive members 131, 132 can be reduced, the stability and convenience of the cooperation between the first and second conductive members 131, 132 can be improved, and the thickness of the first cover plate 13 can be reduced, reducing the space occupied by the first cover plate 13, thereby improving the space utilization of the battery cell 10. On the other hand, because the second conductive member 132 can be exposed from the surface of the first conductive member 131 on the side away from the second receiving groove 12120 through the notch of the second groove 1311, it is convenient to achieve electrical connection between the second conductive member 132 and the current collecting component outside the terminal 12.

[0288] In addition, since the notch of the second groove 1311 is formed on the surface of the first conductive member 131 on the side away from the second receiving groove 12120, it means that the second groove 1311 is open in the direction away from the active material coating portion 21, so that the portion of the groove wall of the first conductive member 131 used to define the second groove 1311 is located between the second receiving groove 12120 and the second conductive member 132 to separate the second receiving groove 12120 and the second conductive member 132, thereby preventing the electrolyte entering the second groove 1311 from contacting the second conductive member 132, thereby reducing leakage of the electrolyte.

[0289] Of course, in other embodiments, the first cover plate 13 may not be a composite form composed of multiple materials. For example, in other embodiments of the present application, Figure 38 is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application, and Figure 39 is a structural explosion diagram of the battery cell shown in Figure 38. Please refer to Figures 38 and 39. The first cover plate 13 as a whole may also be set to a non-composite form made of the same material, for example, for adapting to the positive electrode column, which will not be elaborated here.

[0290] Referring again to Figures 35-37 , in some embodiments, the first cover plate 13 is further embedded in the notch of the second receiving groove 12120. In the above technical solution, by embedding the first cover plate 13 in the second receiving groove 12120, the difficulty of assembling the first cover plate 13 and the pole 12 can be reduced, the assembly stability of the first cover plate 13 and the pole 12 can be improved, as well as the reliability and convenience of the connection. Moreover, the space occupied by the first cover plate 13 outside the pole 12 can be reduced. Moreover, because the first cover plate 13 is embedded in the notch of the second receiving groove 12120, there is sufficient space in the second receiving groove 12120 to accommodate the conductive portion 22.

[0291] Of course, in other embodiments of the present application, the cooperation manner of the first cover plate 13 and the pole 12 is not limited to being embedded in the second receiving groove 12120. The first cover plate 13 can also be directly covered on the outside of the pole 12, that is, directly covered at the notch of the second receiving groove 12120, so as to facilitate cooperation with the convergence component of the battery 100. This is not limited in this embodiment.

[0292] Referring again to Figures 35-37, optionally, in an embodiment of the present application, at least a portion of the wall surface at the notch of the second receiving groove 12120 of the pole 12 is formed as a guiding slope 12126. The guiding slope 12126 is used to guide the first cover plate 13 to mate with the notch of the second receiving groove 12120. In the above technical solution, by processing the wall surface at the notch of the second receiving groove 12120 into a guiding slope, the difficulty of assembling the first cover plate 13 and the second receiving groove 12120 can be reduced, and the efficiency of assembling the first cover plate 13 and the second receiving groove 12120 can be improved. Moreover, when the first cover plate 13 is welded to the guiding slope 12126, the area of ​​the weld can be increased, thereby improving the reliability of the weld connection between the first cover plate 13 and the pole 12 and alleviating the problems of molten pool collapse or laser penetration into the pole 12 during welding.

[0293] Specifically, referring to Figures 35-37, the second receiving groove 12120 includes a first groove section 12124 and a second groove section 12125 located on a side of the first groove section 12124 closer to the pole outer end surface 123. The cross-sectional area of ​​the second groove section 12125 is larger than that of the first groove section 12124, giving the second receiving groove 12120 a stepped groove shape. Furthermore, a step surface 12127 is formed at the junction of the first groove section 12124 and the second groove section 12125. This allows the first cover plate 13, when embedded in the second receiving groove 12120, to be embedded in the second groove section 12125 and supported by the step surface 12127.

[0294] In the above technical solution, by setting the second accommodating groove 12120 as a stepped groove form, the first cover plate 13 can be stably fitted in the groove position of the second accommodating groove 12120, thereby improving the connection stability between the first cover plate 13 and the pole 12, and by limiting the groove depth of the first groove section 12124, there is relatively sufficient space in the second accommodating groove 12120 to accommodate the conductive part 22.

[0295] Furthermore, when the wall surface at the slot of the second accommodating slot 12120 formed by the pole 12 is a guide slope 12126, the cross-sectional area of ​​the second slot segment 12125 can be set to gradually increase in the direction approaching the outer end face 123 of the pole, so that the side wall of the second slot segment 12125 is formed as a guide slope 12126, thereby facilitating processing and simply and effectively meeting the guidance requirements.

[0296] Referring again to Figures 35-37 , in the embodiment of the present application, the first cover plate 13 may further include stress relief grooves 133 as needed. The stress relief grooves 133 are located in the outer peripheral area of ​​the first cover plate 13 to assist in stress relief for the first cover plate 13. In the above technical solution, by providing the stress relief grooves 133 on the first cover plate 13, stress generated during the processing of the first cover plate 13 itself or during the electrical connection between the first cover plate 13 and the terminal 12 can be relieved, thereby improving issues such as deformation or damage to the first cover plate 13 caused by stress.

[0297] Specifically, when the first cover plate 13 and the second receiving groove 12120 are embedded and welded, the stress relief groove 133 can be used to release the stress generated by the welding, improve the transverse heat conduction, and reduce the probability of damage or deformation of the first cover plate 13. At the same time, when the first cover plate 13 is a composite form including the first conductive member 131 and the second conductive member 132, the stress relief groove 133 can be set on the first conductive member 131 and located in the peripheral area of ​​the second conductive member 132. When the first conductive member 131 and the second receiving groove 12120 are embedded and welded, the stress relief groove 133 can be used to release the stress generated by the welding, improve the transverse heat conduction, and reduce the probability of damage or deformation of the second conductive member 132. Moreover, when the second conductive member 132 and the first conductive member 131 are embedded and welded, the stress relief groove 133 can be used to release the stress generated by the welding, improve the transverse heat conduction, and reduce the probability of deformation of the first conductive member 131, which may result in the first conductive member 131 being unable to be embedded in the second receiving groove 12120.

[0298] 38-39 , in the embodiment of the present application, the battery cell 10 may further be provided with a second cover plate 14 as required. The second cover plate 14 is disposed outside the through hole 12130 and is also located outside the conductive portion 22 in the second receiving groove 12120 .

[0299] It is worth noting that when the battery cell 10 includes the second cover plate 14, the battery cell 10 may also include the first cover plate 13, or may not include the first cover plate 13. Furthermore, when the battery cell 10 includes both the second cover plate 14 and the first cover plate 13, the first cover plate 13 may be a composite form made of multiple materials, or may be a non-composite form made of the same material.

[0300] In the above technical solution, at least part of the conductive part 22 is located in the second receiving groove 12120, and the second cover plate 14 covers the conductive part 22 of this part. The second cover plate 14 also covers the through-hole 12130, so that when the electrolyte enters the second receiving groove 12120 from the through-hole 12130, the second cover plate 14 can improve the problem of overflow of this part of the electrolyte from the pole 12, thereby improving the reliability of the battery cell 10.

[0301] For example, as shown in Figures 38 and 39, when a portion of the conductive portion 22 is sandwiched between the second cover plate 14 and the second end wall 12121, laser welding can be used to weld the portion of the conductive portion 22, the second cover plate 14, and the second end wall 12121 together to improve the reliability of the connection between the terminal 12 and the conductive portion 22. Furthermore, because the second cover plate 14 can compress the conductive portion 22, the second cover plate 14 can be used to improve the stability of the conductive portion 22 within the second receiving groove 12120.

[0302] Please refer to Figures 3 to 5, 15, 20 and 34 again to describe the battery cell 10 of the specific embodiment of the present application.

[0303] In the embodiment of the present application, the battery cell 10 is a rectangular parallelepiped. The height of the battery cell 10 is in the first direction Z, the length of the battery cell 10 is in the second direction X, and the thickness of the battery cell 10 is in the third direction Y. The battery cell 10 includes a housing 11, which comprises a body 111 and a cover 112. The body 111 is a square ring-shaped structure, with one end of the body 111 open along the first direction Z and the other end closed along the first direction Z. The cover 112 is disposed over the open portion of the body 111. Two electrodes 12 are provided at the closed end of the body 111 along the first direction Z. The two electrodes 12 are spaced apart along the second direction X to form a positive electrode and a negative electrode, respectively.

[0304] Both poles 12 are provided with an accommodating portion 121, and the accommodating portion 121 includes a second accommodating groove 12120. Specifically, the pole 12 includes a second end wall 12121 and a second side wall 12123. The second end wall 12121 is located on the side of the second side wall 12123 close to the shell cover 112. The second end wall 12121 and the second side wall 12123 are arranged to form the second accommodating groove 12120. The surface of the pole 12 away from the shell cover 112 is the pole outer end face 123. The notch of the second accommodating groove 12120 is formed on the pole outer end face 123. A through hole 12130 is opened on the second end wall 12121. The through hole 12130 is located at a position of the second end wall 12121 adjacent to the second side wall 12123.

[0305] The battery cell 10 also includes a cell assembly 2, a bracket 3 and an insulating member 4. The cell assembly 2 includes an active material coating portion 21 and a conductive portion 22. The active material coating portion 21 is accommodated in the shell 11. The bracket 3 is arranged at one end of the active material coating portion 21, and the bracket 3 is located between the closed end of the shell body 111 along the first direction Z and the active material coating portion 21. The bracket 3 has two through holes 311, and the two through holes 311 are spaced apart along the second direction X.

[0306] The insulating member 4 includes a main insulating portion 41, a first insulating portion 42, and a second insulating portion 43. The first insulating portion 42 and the second insulating portion 43 are respectively arranged at both ends of the main insulating portion 41. The main insulating portion 41 wraps around the periphery of the active material coating portion 21, and the first insulating portion 42 wraps around the end of the active material coating portion 21 away from the bracket 3. The second insulating portion 43 is located on the side of the main insulating portion 41 close to the bracket 3. The second insulating portion 43 cooperates with the side wall of the bracket 3 away from the active material coating portion 21. The second insulating portion 43 and the bracket 3 jointly cover the end of the active material coating portion 21 close to the bracket 3. A portion of the conductive portion 22 extends through the through-hole 311 in the bracket 3 and the through-hole 12130 in the terminal 12 into the second receiving groove 12120 and is welded to the second end wall 12121, thereby electrically connecting the active material coating portion 21 and the terminal 12 through the conductive portion 22.

[0307] In the technical solution of the embodiment of the present application, by connecting at least a portion of the insulating part 4 to the wall of the bracket 3 away from the battery cell assembly 2, on the one hand, in the process of installing the battery cell assembly 2 with the bracket 3 into the shell 11, the shell 11 will not scratch the edge of the insulating part 4, nor will it scratch the connection position between the insulating part 4 and the bracket 3, and the connection position between the two is not easy to be pulled apart during the shell insertion process, which can reduce the movement and slippage of the insulating part 4 during the shell insertion process of the battery cell assembly 2, improve the connection reliability between the insulating part 4 and the bracket 3, reduce the risk of the insulating part 4 falling off, and further reduce the risk of the shell 11 being corroded due to leakage of the battery cell assembly 2, reduce the risk of failure of the battery cell assembly 2 itself, and reduce the risk of leakage. The invention also reduces the risk of damage to the battery cell 10 and improves the reliability and stability of the battery cell 10. Compared with the case where the insulating member 4 is connected to the periphery of the battery cell assembly 2, the insulating member 4 is matched with the bracket 3, so that the insulating member 4 is adjacent to the four periphery surfaces of the housing 11. The chance of interference between the insulating member 4 and the bracket 3 due to the insulating member 4 being adjacent to one surface at one end of the housing 11 is greatly reduced, which can further improve the reliability and stability of the insulating member 4 and the battery cell 10. In addition, by connecting at least a portion of the insulating member 4 to the wall of the bracket away from the battery cell assembly 2, the insulating member 4 can be designed to be longer, suitable for battery cell assemblies 2 of different sizes, with higher compatibility and improved manufacturability. On the other hand, after the bracket 3 and the battery cell assembly 2 are installed in place within the housing 11, the insulating member 4 is pressed between the wall of the housing 11 opposite the opening 1110 and the bracket 3, which can further reduce the risk of the insulating member 4 falling off, reduce the risk of the battery cell 2 failing due to leakage, and reduce the risk of corrosion of the housing 11, thereby improving the reliability and stability of the battery cell 10.

[0308] According to some embodiments of the present application, the present application further provides a battery 100 comprising the battery cell 10 described in any of the above solutions.

[0309] In the above technical solution, since the battery 100 is provided with the above-mentioned battery cell 10, and since at least a portion of the insulating part 4 is connected to the wall of the bracket 3 away from the battery cell assembly 2, the connection reliability between the insulating part 4 and the bracket 3 can be improved, and the risk of the insulating part 4 falling off can be reduced, thereby reducing the risk of the shell 11 being corroded due to leakage of the battery cell assembly 2, reducing the risk of failure of the battery cell assembly 2 itself, and reducing the risk of leakage, thereby improving the reliability and stability of the battery 100.

[0310] According to some embodiments of the present application, the present application further provides an electrical device 1000 , comprising the battery 100 described in any of the above solutions.

[0311] In the above technical solution, since the power consumption device 1000 is provided with the above-mentioned battery 100, the operating reliability and stability of the battery 100 can be improved, and thus the operating reliability and stability of the power consumption device 1000 can be improved. It can be understood that when the power consumption device 1000 is a vehicle, the longer service life of the battery 100 is beneficial to improving the vehicle's range.

[0312] The power-consuming device 1000 may be any of the aforementioned devices or systems using the battery 100 .

[0313] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0314] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery cell (10), wherein: include: Housing (11); Battery cell assembly (2); A bracket (3) is arranged at one end of the battery cell assembly (2); An insulating member (4) cooperates with the bracket (3) and covers the battery core assembly (2); The battery cell assembly (2), the bracket (3) and the insulating member (4) are all arranged in the shell (11), and at least a portion of the insulating member (4) is connected to a wall surface of the bracket (3) away from the battery cell assembly (2).

2. The battery cell (10) according to claim 1, wherein: The insulating member (4) is connected to the wall of the support (3) away from the battery cell assembly (2) in a circular continuous or circular spaced circumferential direction.

3. The battery cell (10) according to claim 2, wherein: The insulating member (4) is thermally melt-connected to a wall surface of the support (3) away from the battery core assembly (2) to form a connection mark (401); The connection mark (401) extends in a circular shape around the circumference of the wall surface; or, there are multiple connection marks (401), and the multiple connection marks (401) are arranged at intervals around the circumference of the wall surface.

4. The battery cell (10) according to claim 1, wherein: The shell (11) is provided with a pole (12); the battery cell assembly (2) comprises an active material coating portion (21) and a conductive portion (22); the conductive portion (22) is connected to a side of the active material coating portion (21) close to the bracket (3), and extends toward the pole (12) and is connected to the pole (12); the insulating member (4) and the bracket (3) are jointly covered in the circumference of the active material coating portion (21).

5. The battery cell (10) according to claim 4, wherein: The insulating member (4) comprises a main insulating portion (41), a first insulating portion (42) and a second insulating portion (43), wherein the main insulating portion (41) is wrapped around the circumference of the active material coating portion (21); The first insulating portion (42) and the second insulating portion (43) are respectively arranged at two ends of the main insulating portion (41); the first insulating portion (42) is located on a side of the main insulating portion (41) away from the bracket (3), and is wrapped around the end of the active material coating portion (21) away from the bracket (3); the second insulating portion (43) is located on a side of the main insulating portion (41) close to the bracket (3), and is used to cooperate with the bracket (3) and, together with the bracket (3), wrap around the end of the active material coating portion (21) close to the bracket (3).

6. The battery cell (10) according to claim 5, wherein: The main insulating portion (41) comprises a plurality of main portions (410); the plurality of main portions (410) are connected end to end in sequence to form a ring shape, the plurality of main portions (410) are wrapped together around the active material coating portion (21), and the first insulating portion (42) and the second insulating portion (43) are respectively located at two ends of the ring structure formed by the plurality of main portions (410).

7. The battery cell (10) according to claim 6, wherein: The connection positions of any two adjacent main bodies (410) are partially overlapped.

8. The battery cell (10) according to claim 6, wherein: The active material coating portion (21) has a plurality of surfaces on its peripheral side; Each of the main body parts (410) comprises a main body surface and two flanges arranged on both sides of the main body surface, any two adjacent main body parts (410) are connected by the flanges, and the connection structure of each main body surface and each two flanges respectively wraps around different surfaces of the peripheral side of the active material coating part (21).

9. The battery cell (10) according to claim 8, wherein: The active material coating portion (21) has four surfaces on its circumferential side; The main body insulating portion (41) comprises two main body portions (410) arranged on both sides of the first insulating portion (42), namely a first main body portion (411) and a second main body portion (412); the first main body portion (411) comprises a first main body surface (4111) and a first flange (4112) and a second flange (4113) arranged on both sides of the first main body surface (4111); the second main body portion (412) comprises a second main body surface (4121) and a third flange (4122) and a fourth flange (4123) arranged on both sides of the second main body surface (4121); the first flange (4112) and the third flange (4122) are connected, and the second flange (4113) and the fourth flange (4123) are connected; The first main surface (4111), the connection structure of the first flange (4112) and the third flange (4122), and the connection structure of the second main surface (4121), the second flange (4113) and the fourth flange (4123) respectively wrap around four surfaces arranged in sequence on the circumferential side of the active material coating portion (21).

10. The battery cell (10) according to claim 9, wherein: The first insulating portion (42) has a center line (42a), and the first main body portion (411) and the second main body portion (412) are respectively located on both sides of the center line (42a) of the first insulating portion (42); With the center line (42a) as the axis of symmetry, the first main body portion (411) and the second main body portion (412) are symmetrically arranged, or the first main body surface (4111) and the second main body surface (4121) are symmetrically arranged.

11. The battery cell (10) according to claim 8, wherein: The second insulating portion (43) comprises a plurality of insulating sub-portions (430), and the plurality of insulating sub-portions (430) are connected to the plurality of main body portions (410) in a one-to-one correspondence; Any two adjacent insulating sections (430) partially overlap.

12. The battery cell (10) according to claim 11, wherein: Each of the insulating sub-parts (430) comprises a main surface (431) and two sub-surfaces (432), wherein the main surface (431) is connected to the main surface of the corresponding main body (410), and the two sub-surfaces (432) are respectively connected to the two flanges of the corresponding main body (410); The two sub-surfaces (432) corresponding to any two adjacent flanges are connected, and each sub-surface (432) is connected to the adjacent main surface (431).

13. The battery cell (10) according to claim 12, wherein: The two sub-faces (432) corresponding to any two adjacent flanges are partially overlapped; and / or each sub-face (432) is partially overlapped with the adjacent main face (431).

14. The battery cell (10) according to claim 5, wherein: A connection position between the main body insulating portion (41) and the first insulating portion (42) has a notch (44); and / or a connection position between the main body insulating portion (41) and the second insulating portion (43) has a notch (44).

15. The battery cell (10) according to any one of claims 1 to 14, wherein: The shell (11) is provided with a pole (12); the battery cell assembly (2) comprises an active material coating portion (21) and a conductive portion (22), the conductive portion (22) being connected to a side of the active material coating portion (21) close to the bracket (3), the bracket (3) having a via hole (311), and the conductive portion (22) passing through the via hole (311) to be connected to the pole (12).

16. The battery cell (10) according to claim 15, wherein: The bracket (3) is an integrated structure; or, the bracket (3) is a split structure and comprises a first bracket (33) and a second bracket (34) that are separately formed, and the through hole (311) is defined between the first bracket (33) and the second bracket (34).

17. The battery cell (10) according to claim 15, wherein: A receiving groove (393) communicating with the via hole (311) is provided on a side of the bracket (3) facing away from the active material coating portion (21), and the receiving groove (393) receives at least a portion of the pole (12).

18. The battery cell (10) according to claim 15, wherein: A guide portion (32) is provided on a side of the bracket (3) that is away from the active material coating portion (21); the guide portion (32) is arranged around the via hole (311) and extends in a direction close to the pole (12).

19. The battery cell (10) according to claim 18, wherein: The pole (12) is provided with a receiving portion (121), at least a portion of the conductive portion (22) is received in the receiving portion (121), and at least a portion of the guide portion (32) extends into the receiving portion (121) to guide the conductive portion (22) to be received in the receiving portion (121).

20. The battery cell (10) according to claim 15, wherein: A guide groove (312) connected to the via hole (311) is formed on one side of the bracket (3) facing the active material coating portion (21); the guide groove (312) accommodates at least a portion of the conductive portion (22); and the cross-sectional area of ​​the guide groove (312) gradually increases along a direction in which the bracket (3) approaches the active material coating portion (21).

21. The battery cell (10) according to claim 20, wherein: The support (3) is provided with at least one first liquid injection guide groove (392), the first liquid injection guide groove (392) being located on a side of the support (3) facing the active material coating portion (21); at least one first liquid injection guide groove (392) is connected to the guide groove (312).

22. The battery cell (10) according to any one of claims 1 to 21, wherein: The support (3) has a first liquid injection guide groove (392), and the first liquid injection guide groove (392) is located on a side of the support (3) close to the battery cell assembly (2); and / or the support (3) has a second liquid injection guide groove, and the second liquid injection guide groove is located on a side of the support (3) away from the battery cell assembly (2).

23. The battery cell (10) according to any one of claims 1 to 22, wherein: The side of the support (3) facing the battery cell assembly (2) has a clearance portion (391) for avoiding the outer edge of the battery cell assembly (2) facing the side of the support (3).

24. The battery cell (10) according to any one of claims 1 to 23, wherein: A limiting protrusion (38) is provided on one side of the bracket (3), and the limiting protrusion (38) is clamped with the battery core assembly (2).

25. The battery cell (10) according to any one of claims 1 to 24, wherein: The housing (11) is provided with a pole (12); the battery cell assembly (2) comprises an active material coating portion (21) and a conductive portion (22), and the conductive portion (22) is connected to a side of the active material coating portion (21) close to the bracket (3); The pole (12) is provided with a receiving portion (121), and at least a portion of the conductive portion (22) is received in the receiving portion (121) and connected to the pole (12).

26. The battery cell (10) according to claim 25, wherein: The accommodating portion (121) has a first accommodating groove (12110); the surface of the pole (12) facing the active material coating portion (21) is the pole inner end face (122); a notch of the first accommodating groove (12110) is formed on the pole inner end face (122); and at least a portion of the conductive portion (22) is accommodated in the first accommodating groove (12110).

27. The battery cell (10) according to claim 25, wherein: The accommodating portion (121) has a second accommodating groove (12120); the surface of the pole (12) away from the active material coating portion (21) is the pole outer end face (123); the notch of the second accommodating groove (12120) is formed on the pole outer end face (123); the second accommodating groove (12120) is connected to the interior of the shell (11) through a through hole (12130); the conductive portion (22) is passed through the through hole (12130) and is at least partially accommodated in the second accommodating groove (12120).

28. The battery cell (10) according to any one of claims 1 to 27, wherein: The housing (11) comprises a housing body (111) and a housing cover (112); the housing body (111) has an opening (1110); The number of the openings (1110) is one, the shell cover (112) covers the opening (1110), and the bracket (3) is located at an end of the battery cell assembly (2) away from the opening (1110); or, the number of the openings (1110) is two, each of the openings (1110) is covered by one of the shell covers (112), and the bracket (3) is located at an end of the battery cell assembly (2) away from any one of the openings (1110).

29. The battery cell (10) according to any one of claims 1 to 28, wherein: At least one pole (12) is arranged on a shell wall of the shell (11) on one side adjacent to the bracket (3).

30. A battery (100), wherein: The invention comprises a battery cell (10) according to any one of claims 1 to 29.

31. An electrical device (1000), wherein: Comprising a battery (100) according to claim 30.

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