Battery monomer, battery and electric device

Abstract

The utility model relates to the field of batteries, in particular to a battery monomer, a battery and a power utilization device. According to the technical scheme of the embodiment of the invention, the battery monomer comprising the shell and the anti-explosion valve is provided. The shell comprises a first wall, and the anti-explosion valve and the liquid injection hole are both formed in the first wall. The first wall is also provided with a concave part; the concave part comprises a first part and a second part; the first part is arranged around the anti-explosion valve, the second part is arranged on the side, away from the anti-explosion valve, of the first part, the first part is communicated with the second part, and the second part is arranged on the side, away from the liquid injection hole, of the first part. And the first part and the second part are communicated to prolong the length of the concave part, so that the circulation path of the electrolyte is increased. When too much electrolyte is stored in the first part, the redundant electrolyte can move to the second part. In addition, the second part can receive the splashed electrolyte. Therefore, through mutual cooperation of the structures of all the parts on the battery monomer, the risk that the explosion-proof valve is damaged by electrolyte is reduced, and the safety of the battery is improved.

Description

Technical Field

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

[0002] With the development of battery technology, when the electrolyte is injected into the injection hole, the electrolyte may overflow or splash onto the explosion-proof valve due to factors such as too fast injection speed or too much injection, thereby corroding the explosion-proof valve, reducing the reliability of the explosion-proof valve and thus reducing the safety of the battery. Therefore, how to reduce the risk of electrolyte damaging the explosion-proof valve is a technical problem that needs to be solved in battery technology. Summary of the invention

[0003] Based on this, the present application provides a battery cell, a battery and an electrical device to reduce the risk of electrolyte damaging the explosion-proof valve and improve the safety of the battery.

[0004] In a first aspect, an embodiment of the present application provides a battery cell, comprising a housing and an explosion-proof valve. The housing comprises a first wall, and a liquid injection hole is provided on the first wall. The explosion-proof valve is provided on the first wall. The first wall is provided with a recess, and the recess comprises a first part arranged around the explosion-proof valve, and a second part arranged on a side of the first part away from the explosion-proof valve, the first part is connected to the second part, and the second part is located on a side of the explosion-proof valve away from the liquid injection hole.

[0005] In one embodiment, the second portion has a starting opening and an ending opening arranged along an extending direction of the second portion;

[0006] The starting port and the ending port are both connected to the first part, and the starting port and the ending port are arranged at intervals.

[0007] In one of the embodiments, the axis of the injection hole points toward the interior of the housing, and the bottom of the second part is closer to the interior of the housing than the bottom of the first part.

[0008] In one embodiment, the connection between the first part and the second part defines a connecting surface, and the connecting surface is connected to the bottom of the first part and the wall of the second part;

[0009] Wherein, the orthographic projection of the connection surface on the reference surface is a line; or

[0010] The orthographic projection of the connecting surface on the reference surface is a surface, and the orthographic projection of the connecting surface on the reference surface is located within the range of the orthographic projection of the first part on the reference surface;

[0011] The reference surface is oriented in a direction perpendicular to the axis of the liquid injection hole and pointing toward the inside of the shell.

[0012] In one embodiment, the second portion includes a first section, and a second section connecting the first section and the first portion;

[0013] The second section has a first opening connecting to the first section and a second opening connecting to the first part; the first part has a first sidewall disposed around the explosion-proof valve and a second sidewall disposed around the first sidewall; the second opening is formed on the second sidewall, and the second opening has a first edge and a second edge oppositely disposed along the extending direction of the second sidewall.

[0014] The extending trend direction of the second sidewall to the first edge is the first target direction, and the extending trend direction of the second sidewall to the second edge is the second target direction; the first target direction and the second target direction are opposite to each other, and both the first target direction and the second target direction are perpendicular to the direction from the second opening pointing to the first opening.

[0015] In one embodiment, the second section extends linearly between the first opening and the second opening; and / or

[0016] There are two second sections, one of the second sections is connected to one end of the first section and the first part, and the other second section is connected to the other end of the first section and the first part; the part of the first part located between the two second sections is defined as the target part, the target part faces the first section, and the extending trend of the target part is the same as that of the first section.

[0017] In one embodiment, the second part includes a first section and a second section connecting the first section and the first part;

[0018] Along the direction pointing from the axis of the liquid injection hole to the inside of the housing, the cross-sectional area of the second section shows a decreasing trend.

[0019] In one embodiment, along the direction pointing from the axis of the liquid injection hole to the inside of the housing, the cross-sectional area of the second section gradually decreases.

[0020] In one embodiment, along the extending direction of the second section, the cross-sectional shape of the second section is an isosceles triangle.

[0021] In one embodiment, the first part has a first sidewall disposed around the explosion-proof valve and a second sidewall disposed around the first sidewall;

[0022] The first sidewall has a first boundary line facing away from the inside of the housing, and the second sidewall has a second boundary line facing away from the inside of the housing;

[0023] Along the direction pointing from the axis of the liquid injection hole to the inside of the housing, the second boundary line is closer to the inside of the housing than the first boundary line.

[0024] In one embodiment, the first part has a first sidewall disposed around the explosion-proof valve and a second sidewall disposed around the first sidewall; an exhaust hole is provided on the first sidewall.

[0025] In one embodiment, the exhaust hole is arranged at an end of the first side wall away from the interior of the housing along the axis of the injection hole pointing to the interior of the housing; and / or

[0026] Along the direction from the axis of the injection hole to the inside of the shell, the cross-sectional area of ​​the exhaust hole tends to decrease.

[0027] In a second aspect, an embodiment of the present application provides a battery, comprising a battery cell in any of the above embodiments.

[0028] In a third aspect, an embodiment of the present application provides an electrical device, comprising a battery in any of the above embodiments, and the battery is used to provide electrical energy.

[0029] In the above-mentioned battery cell, battery and electrical device, the battery cell includes a shell and an explosion-proof valve. The shell includes a first wall, and the explosion-proof valve and the injection hole are both arranged on the first wall. The first wall is also provided with a recess, and the recess includes a first part and a second part. The first part is arranged around the explosion-proof valve, and the second part is arranged on the side of the first part away from the explosion-proof valve, and the first part is connected to the second part, and the second part is arranged on the side away from the injection hole. The first part is connected to the second part to extend the length of the recess, thereby increasing the flow path of the electrolyte. When too much electrolyte is stored in the first part, the excess electrolyte can move to the second part. In addition, the second part can receive the splashed electrolyte. Therefore, through the mutual cooperation of the various parts of the structure on the battery cell, the risk of the electrolyte damaging the explosion-proof valve is reduced, and the safety of the battery is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the exploded structure of a battery cell in some embodiments of the present application.

[0031] Figure 2 for Figure 1 Schematic diagram of the three-dimensional structure of the first wall of the battery cell.

[0032] Figure 3a It is a schematic top view of a first wall of a battery cell according to some embodiments of the present application.

[0033] Figure 3b for Figure 3a A schematic cross-sectional view of the first wall of the battery cell along the XX direction.

[0034] Figure 3c for Figure 3b A partial enlarged view of point E in the middle.

[0035] Figure 3d for Figure 3a A partial enlarged view of point D in the middle.

[0036] Figure 4Schematic top view of the first wall of a battery cell according to other embodiments of the present application.

[0037] Figure 5a is Figure 1 Schematic three-dimensional structure view of the first wall of the battery cell in from another perspective.

[0038] Figure 5b is Figure 5a Schematic cross-sectional view of the first wall of the battery cell in along the Y-Y direction.

[0039] Figure 5c is Figure 5b Local enlarged view at F in .

[0040] Figure 6a Schematic view of the connection surface projected onto the reference plane in some embodiments of the present application.

[0041] Figure 6b Schematic view of the connection surface projected onto the reference plane in other embodiments of the present application.

[0042] Figure 7a is Figure 1 Schematic three-dimensional structure view of the first wall of the battery cell in from another perspective.

[0043] Figure 7b is Figure 7a Local enlarged view at R in .

[0044] The reference numerals in the specific embodiments are as follows:

[0045] Battery cell 100, outer shell 110, housing 1101, electrode assembly 111, end cap 1112, first wall b1, liquid injection hole A, recess B, first part B1, first side wall C1, first boundary line J1, second boundary line J2, exhaust hole P, second side wall C2, second part B2, starting port Q, terminating port Z, first section B21, second section B22, first opening K1, second opening K2, first edge Y1, second edge Y2, connection surface U, explosion-proof valve 120, explosion-proof sheet 121, notch H, film attaching member 122, adhesive 123;

[0046] First target direction M1, second target direction M2, central symmetry axis L1, projection line L2, projection plane T1, reference plane S;

[0047] First direction F1, second direction F2, third direction F3. Specific embodiments

[0048] To make the above objects, features, and advantages of the present application more apparent and understandable, the following provides a detailed description of the specific embodiments of the present application with reference to the accompanying drawings. A lot of specific details are set forth in the following description to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0049] In the description of the present application, it should be understood that if terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0050] In addition, if terms such as "first" and "second" appear, these terms are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0051] In the present application, unless otherwise clearly specified and limited, if terms such as "install", "connect", "join", "fix", etc. appear, these terms should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0052] In this application, unless otherwise clearly specified or limited, if there is a description such as a first feature being "on" or "under" a second feature, the meaning can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is less than that of the second feature.

[0053] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there can also be an intermediate element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. If so, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in this application are only for the purpose of illustration and do not represent the only implementation.

[0054] Currently, from the perspective of the development of the market situation, the application of power batteries is becoming more and more widespread. The electrolyte is an indispensable part of the battery, which refers to the liquid medium used to conduct current during the electrolysis process. The electrolyte usually enters the battery interior through the liquid injection hole. The liquid injection hole is used to add the electrolyte into the battery cell, so that users can directly add distilled water or electrolyte into the battery interior without opening the battery.

[0055] When the electrolyte is injected at the liquid injection hole, it may cause the electrolyte to overflow or splash due to factors such as too fast injection speed or too much injection volume, resulting in the electrolyte corroding and damaging the explosion-proof valve.

[0056] Based on this, in order to reduce the risk of the electrolyte entering the explosion-proof valve, the embodiment of this application provides a battery cell. By arranging a structure that can be used to store the electrolyte around the explosion-proof valve, and extending the flow path of the electrolyte through this structure, the overflowed or splashed electrolyte is contained, reducing the risk of the electrolyte damaging the explosion-proof valve and improving the safety of the battery.

[0057] The battery cell disclosed in the embodiment of this application is used for a battery, and the battery can be but is not limited to being used in power-consuming devices such as vehicles, ships or aircraft. A power supply system of the power-consuming device can be formed by using the battery disclosed in this application and some other components.

[0058] Refer to Figure 1 , Figure 1The exploded structural schematic diagram of the battery cell 100 in some embodiments of the present application is shown. The battery cell 100 provided in an embodiment of the present application includes a housing 110 and an explosion-proof valve 120.

[0059] Continuing to refer to Figure 1 , the battery cell 100 includes a housing 110, an electrode assembly 111, and other functional components. The housing 110 includes a housing body 1101 and an end cap 1112. The end cap 1112 refers to a component that can be closed on the housing body 1101 to isolate the internal environment of the battery cell 100 from the external environment. Without limitation, the shape of the end cap 1112 can be adapted to the shape of the housing body 1101 to cooperate with the housing body 1101. Optionally, the end cap 1112 can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the end cap 1112 is not easily deformed when being squeezed or collided, so that the battery cell 100 can have higher structural strength and the safety performance can also be improved. The material of the end cap 1112 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. The embodiments of the present application do not make special restrictions on this. In some embodiments, an insulating member can be further provided on the inner side of the end cap 1112. The insulating member can be used to isolate the electrical connection components in the housing body 1101 from the end cap 1112 to reduce the risk of short circuit. Exemplarily, the material of the insulating member can be plastic, rubber, etc.

[0060] The housing body 1101 is a component used to cooperate with the end cap 1112 to form the internal environment of the battery cell 100. Among them, the formed internal environment can be used to accommodate the electrolyte (not shown in the figure) and other components. The housing body 1101 and the end cap 1112 can be independent components. Without limitation, the end cap 1112 and the housing body 1101 can also be integrated. Specifically, the end cap 1112 and the housing body 1101 can first form a common connection surface U before other components are put into the housing, and when it is necessary to encapsulate the inside of the housing body 1101, then the end cap 1112 is closed on the housing body 1101. The housing body 1101 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. The material of the housing body 1101 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. The embodiments of the present application do not make special restrictions on this.

[0061] As Figure 1 shown in the figure, the first direction F1 in the figure is the height direction of the battery cell 100, the second direction F2 is the width direction of the battery cell 100, and the third direction F3 is the length direction of the battery cell 100. The first direction F1, the second direction F2, and the third direction F3 are perpendicular to each other. It can be understood that the first direction F1, the second direction F2, and the third direction F3 are only for the convenience of description and are not a limitation on the embodiments of the present application.

[0062] Continuing to refer to Figure 1, with reference to Figure 2 , Figure 2 is Figure 1 a schematic three-dimensional structure diagram of the first wall b1 of the battery cell 100 in . The outer shell 110 is a component with a wall structure. The outer shell 110 includes a first wall b1, and a liquid injection hole A is provided on the first wall b1. Exemplarily, according to the different placement positions of the outer shell 110, the first wall b1 can refer to the end caps 1112 located at both ends of the battery, or can also be the side wall located on the side of the battery, as long as it is the wall that constitutes the outer shell 110, and no specific limitation is made here. The outside and inside of the outer shell 110 are relative. The inside of the outer shell 110 is used to form the internal environment of the battery cell 100. Correspondingly, the outside of the outer shell 110 is the external environment of the battery cell 100. In the embodiment of the present application, the case where the first wall b1 is the end cap 1112 is illustrated.

[0063] The explosion-proof valve 120 is a necessary component inside the battery cell 100. When the battery cell 100 is overcharged or over-discharged, a large amount of extra gas will be generated inside the battery cell 100. Therefore, an explosion-proof component needs to be provided to reduce the risk of explosion of the battery cell 100. Continue to refer to Figure 1 and Figure 2 , and with reference to Figure 3a , Figure 3b and Figure 3c , Figure 3a is a schematic top view of the first wall b1 of the battery cell 100 in some embodiments of the present application, Figure 3b is Figure 3a a schematic cross-sectional view of the first wall b1 of the battery cell 100 along the X-X direction in , Figure 3c is Figure 3b a partial enlarged view at E in . Exemplarily, the explosion-proof valve 120 may include a notch H, an explosion-proof sheet 121, and a film attaching member 122. The film attaching member 122 is installed on the first wall b1 through an adhesive 123 to separate the explosion-proof sheet 121 from the outside. Among them, the notch H has a notch H that is recessed into the inside of the housing 1101. When the battery cell 100 is overcharged or over-discharged, extra gas is generated inside the battery cell 100. As the internal pressure of the battery cell 100 increases, the notch H of the explosion-proof valve 120 will be deformed. The internal gas pressure generates a thrust on the notch H, causing the notch H to deform from concave to convex. If the thrust exceeds the strength of the material at the notch H, the notch H will break, resulting in the opening of the explosion-proof valve 120, releasing the excessive pressure inside the battery cell 100, thereby reducing the risk of further overheating and even explosion of the battery cell 100.

[0064] Continue to refer to Figure 1 , Figure 3a , with reference to Figure 3d , Figure 3d is Figure 3a a partial enlarged view at D in .

[0065] A recess B is provided on the first wall b1. The recess B refers to a part on the first part that is recessed from the outer surface of the first wall b1 towards the inner surface of the first wall b1. The outer surface of the first wall b1 refers to the surface facing away from the interior of the outer shell 110, and the inner surface of the first wall b1 refers to the surface located inside the outer shell 110. In the embodiment of the present application, taking Figure 1 as an example, the outer surface of the first wall b1 and the inner surface of the first wall b1 are oppositely arranged along the first direction F1.

[0066] The recess B includes a first part B1 disposed around the explosion-proof valve 120, and a second part B2 provided on the side of the first part B1 away from the explosion-proof valve 120. The first part B1 communicates with the second part B2, and the second part B2 is located on the side of the explosion-proof valve 120 away from the liquid injection hole A. The shape of the recess B can be set to be circular, square, oval, triangular, etc., which is not limited herein.

[0067] Some ways for the recess B to store and flow the electrolyte include but are not limited to the following situations: Situation 1: When the electrolyte flows to the position where the first part B1 communicates with the second part B2, the electrolyte accumulates near the communication point in the first part B1 and then flows into the second part B2; Situation 2: When the electrolyte flows to the position where the first part B1 communicates with the second part B2, the electrolyte continues to flow in the first part B1 due to inertia.

[0068] In some other embodiments, the recess B can be provided between the liquid injection hole A and the explosion-proof valve 120 to prevent the electrolyte from corroding the explosion-proof valve 120. The recess B can also be provided on the side close to the liquid injection hole A to accommodate the electrolyte overflowing from the liquid injection hole A.

[0069] It can be understood that if a blocking structure independent of both the electrolyte and the explosion-proof valve 120 is provided between the electrolyte and the explosion-proof valve 120 to prevent the risk of the electrolyte damaging the explosion-proof valve 120, only the electrolyte overflowing from the liquid injection hole A or the electrolyte at the blocking structure can be prevented from overflowing to the explosion-proof valve 120. For the case of electrolyte splashing, when the electrolyte splashes to the blocking structure, the electrolyte may still corrode the explosion-proof valve 120 due to excessive accumulation at the blocking structure, and the blocking structure can only receive a part of the electrolyte between the liquid injection hole A and the explosion-proof valve 120 after being splashed, and there is still a risk of corroding the explosion-proof valve 120.

[0070] Compared with the method of setting the blocking structure, as before, a recess B is further provided on the first wall b1, and the recess B includes a first part B1 and a second part B2. The first part B1 is arranged around the explosion-proof valve 120, and the second part B2 is arranged on the side of the first part B1 away from the explosion-proof valve 120, and the first part B1 is connected to the second part B2, and the second part B2 is arranged on the side away from the injection hole A. The first part B1 and the second part B2 are connected to extend the length of the recess B, thereby increasing the flow path of the electrolyte. When the electrolyte in the first part B1 is too much, the excess electrolyte can move to the second part B2. In addition, the second part B2 can receive the splashed electrolyte. The second part B2 can receive the electrolyte that is directly splashed outward from the injection hole A to the second part B2, and can also receive the electrolyte that is first splashed to the first part B1 and then splashed to the second part B2, reducing the risk of the electrolyte damaging the explosion-proof valve 120 and improving the safety of the battery.

[0071] It can be understood that if the second part B2 is arranged on the side close to the injection hole A, the electrolyte at the injection hole A will more easily flow directly into the second part B2 after overflowing, causing the electrolyte at the second part B2 to accumulate rapidly. In the embodiment of the present application, the second part B2 is arranged on the side away from the injection hole A, and the electrolyte will flow directly into the first part B1 after overflowing, and only a small part of the electrolyte will splash into the second part B2, or because the electrolyte in the first part B1 flows into the second part B2 too much, the risk of the electrolyte damaging the explosion-proof valve 120 is reduced, and the safety of the battery is improved.

[0072] In some embodiments of this application, please continue to refer to Figure 3a and Figure 3d The second part B2 has a starting port Q and an ending port Z arranged along the extension direction of the second part B2, the starting port Q and the ending port Z are both connected to the first part B1, and the starting port Q and the ending port Z are arranged at intervals. The extension direction is the second direction F2.

[0073] “Starting port Q” refers to the inlet for injecting or releasing electrolyte in the battery. “Ending port Z” refers to the outlet for injecting or releasing electrolyte in the battery. That is, when there is too much electrolyte in the first part B1, the electrolyte flows from the starting port Q or the ending port Z into the second part B2. When there is too much electrode liquid in the second part B2, part of the electrolyte will flow from the second part B2 to the first part B1. The shape of the explosion-proof valve 120 can be set to be circular, square, elliptical, triangular, etc. Correspondingly, the shape of the first part B1 can also be set to match the explosion-proof valve 120 to enhance the strength around the explosion-proof valve 120. In this way, the positions of the starting port Q and the ending port Z are on the central symmetry axis L1 of the explosion-proof valve 120, which can be referred to. Figure 4 , Figure 4 for Figure 3dThe top view schematic diagram of the first wall b1 when the starting port Q and the ending port Z of the second part B2 are located on the central symmetry axis L1 of the explosion-proof valve 120. At this time, the second part B2 has the longest path on the side away from the liquid injection port and can hold the most electrolyte. Of course, it can also be set as shown in Figure 3d Although the path is shorter than that of the setting in Figure 4 , there are fewer concave parts B set, and the strength of the wall is greater. Therefore, it can be selected according to the overflow and splash situation of the electrolyte and the stress strength requirements of the overall device, and no limitation is made here.

[0074] In this way, by setting the starting port Q and the ending port Z, compared with setting a single circulation port, the electrolyte can flow between the first part B1 and the second part B2 faster, further reducing the risk of corroding the explosion-proof valve 120. Compared with setting multiple circulation ports, the overall device has stronger strength and is not easy to break.

[0075] In some embodiments of the present application, continue to refer to Figure 3b and Figure 3c . Along the axial direction of the liquid injection hole A pointing to the inside of the housing 110, that is, Figure 1 the first direction F1 shown in

[0076] The bottom of the second part B2 is closer to the inside of the housing 110 than the bottom of the first part B1. The concave part B protrudes from the direction from the outside of the housing 110 to the inside of the housing 110. The bottom of the concave part B can be an arc surface or a horizontal surface. Both the first part B1 and the second part B2 are the concave part B.

[0077] In some embodiments of the present application, please refer to Figure 5a , 5b and Figure 5c . Figure 5a is Figure 1 Another perspective three-dimensional structure schematic diagram of the first wall b1 of the battery cell 100 in Figure 5b is Figure 5a The cross-sectional schematic diagram of the first wall b1 of the battery cell 100 in Figure 5c is Figure 5bPartial enlarged view at F in []. The connection between the first part B1 and the second part B2 defines a connection surface U, and the connection surface U is connected to the bottom of the first part B1 and the wall surface of the second part B2. Among them, when the positive projection of the connection surface U on the reference surface S is the projection line L2, the electrolyte falls vertically through the connection surface U, and reference can be made to Figure 6a , Figure 6a is the first schematic diagram of the projection of the connection surface U in some embodiments of the present application onto the reference surface S. Among them, the reference surface S is parallel to the second direction F2 and the third direction F3.

[0078] If the connection surface U is set as a slope, the gravity is decomposed into two components, one is the force along the slope direction along the slope surface, and the other is the force perpendicular to the slope direction perpendicular to the slope surface. The steeper the slope, the greater the proportion of the component of the force along the slope in the gravity, which means that the driving force received by the electrolyte is stronger, resulting in an accelerated flow rate. Therefore, when the connection surface U is designed as a vertical surface, that is, when the positive projection of the connection surface U on the reference surface S is a line, the force perpendicular to the slope surface is the smallest, the component of the force along the slope is the largest, and the flow rate of the electrolyte is the fastest.

[0079] In some embodiments of the present application, reference can be made to Figure 6b , Figure 6b is the schematic diagram of the projection of the connection surface U in some other embodiments of the present application onto the reference surface S. The positive projection of the connection surface U on the reference surface S is the projection surface T1, and the positive projection of the connection surface U on the reference surface S is within the range of the positive projection of the first part B1 on the reference surface S. The orientation of the reference surface S is perpendicular to the axis of the liquid injection hole A and points towards the inside of the housing 110, where the direction of the axis of the liquid injection hole A pointing towards the inside of the housing 110 is the direction opposite to the first direction F1.

[0080] At this time, when the electrolyte flows to the starting port Q and the ending port Z, it will directly fall from the first part B1 to the second part B2, and the electrolyte will contact the connection surface U less, further reducing the effect of friction, and the flow rate of the electrolyte is faster.

[0081] It should be noted that compared with the situation where the positive projection of the connection surface U on the reference surface S is a surface and the positive projection of the connection surface U on the reference surface S is within the range of the positive projection of the first part B1 on the reference surface S, and the orientation of the reference surface S is perpendicular to the axis of the liquid injection hole A and points towards the inside of the housing 110, the production process is simpler. Therefore, the connection surface U can be designed according to process requirements or actual requirements.

[0082] Continue to refer to Figure 3a and Figure 3d , and in combination with reference to Figure 7a and Figure 7b , Figure 7a is Figure 1Schematic diagram of the three-dimensional structure of the first wall b1 of the middle battery cell 100 from another perspective, and it can also be used for Figure 7a The enlarged view of the local area at R in the figure. In some embodiments of the present application, the second part B2 includes a first section B21 and a second section B22 connecting the first section B21 and the first part B1. The second section B22 has a first opening K1 connecting the first section B21 and a second opening K2 connecting the first part B1. The first part B1 has a first side wall C1 arranged around the explosion-proof valve 120 and a second side wall C2 arranged around the first side wall C1. The second opening K2 is formed on the second side wall C2. The second opening K2 has a first edge Y1 and a second edge Y2 arranged opposite to each other along the extending direction of the second side wall C2. The extending trend direction of the second side wall C2 to the first edge Y1 is the first target direction M1, and the extending trend direction of the second side wall C2 to the second edge Y2 is the second target direction M2.

[0083] The extending trend direction refers to the direction in which the second side wall C2 extends, but does not limit the shape of the second side wall C2. Since the first target direction M1 and the second target direction M2 extend obliquely away from each other, that is, the second side wall C2 is not a structure extending in one direction, but a structure extending in multiple directions. For example, if a component extends in one direction, the component is configured to extend in a straight line shape. If a component extends in multiple directions, the component can be configured to extend in a curved shape or a folded line shape, etc. The extending direction will be described in combination with the situations shown in some embodiments later, and no more details will be given here.

[0084] The flow path of the electrolyte at the starting port Q or the terminating port Z is that part of the electrolyte flows from the connection surface U direction to the second part B2 due to the influence of gravity, and another part of the electrolyte continues to flow along the first target direction M1 or the second target direction M2 due to inertia.

[0085] Make the first target direction M1 and the second target direction M2 opposite to each other, and both the first target direction M1 and the second target direction M2 are perpendicular to the direction in which the second opening K2 points to the first opening K1. With such a setting, no matter which path the electrolyte flows through in the first part B1, it can make the electrolyte reach the second part B2 as fast as possible during the flowing process, improving the transmission efficiency.

[0086] In some embodiments of the present application, continue to refer to Figure 3a And Figure 3d, the second section B22 extends linearly between the first opening K1 and the second opening K2; and / or, there are two second sections B22, one of the second sections B22 communicates with one end of the first section B21 and the first part B1, and the other second section B22 communicates with the other end of the first section B21 and the first part B1. The part of the first part B1 located between the two second sections B22 is defined as the target part, the target part faces the first section B21, and the extension trend of the target part is the same as that of the first section B21.

[0087] The second section B22 extends linearly between the first opening K1 and the second opening K2, so that as little electrolyte as possible stays between the first opening K1 and the second opening K2, and the electrolyte quickly flows to the first section B21 and is stored at the first section B21. Setting the extension trend of the target part to be the same as that of the first section B21 maintains the coherence of the overall structural design, making the design more unified, harmonious and beautiful. At the same time, setting the target part and the first part B1 to have the same extension trend facilitates the processing and manufacturing of the first part B1 and the target part.

[0088] In some embodiments of the present application, continue to refer to Figure 5a , Figure 5b and Figure 5c . The second part B2 includes a first section B21 and a second section B22 connecting the first section B21 and the first part B1. Along the direction pointing to the inside of the housing 110 along the axis of the liquid injection hole A, along the direction pointing to the inside of the housing 110 along the axis of the liquid injection hole A, the cross-sectional area of the second section B22 shows a decreasing trend.

[0089] It should be noted that the "decreasing trend" may include stepwise decrease, such as decreasing first, then remaining unchanged, and then decreasing; it may also include continuous decrease, such as a uniform decreasing speed or decreasing faster first and then slower. Taking the decreasing trend of decreasing first, then remaining unchanged, and then decreasing as an example, the decreasing trend is divided into three stages: the "decreasing first" stage, the "remaining unchanged" stage, and the "decreasing later" stage.

[0090] With such a design, the cross-sectional area at the bottom of the second part B2 is the smallest, and the electrolyte can naturally concentrate at the bottom of the second part B2. The friction of the electrolyte flowing at the bottom of the second part B2 is small, so that the flow speed of the electrolyte is faster.

[0091] In some embodiments of the present application, continue to refer to Figure 5a , Figure 5b and Figure 5c . Along the direction pointing to the inside of the housing 110 along the axis of the liquid injection hole A, the cross-sectional area of the second section B22 gradually decreases.

[0092] The cross-sectional area of the second section B22 gradually decreases, which is the case where the cross-sectional area has been decreasing and the rate of cross-sectional decrease is consistent. Setting the cross-sectional area to keep decreasing can enable the electrolyte to flow to the bottom of the second part B2 more quickly. Setting the rate of cross-sectional decrease to be consistent makes the flow of the electrolyte more uniform.

[0093] According to some embodiments of the present application, continue to refer to Figure 5a 、 Figure 5b and Figure 5c 。Along the extending direction of the second section B22, the cross-sectional shape of the second section B22 is an isosceles triangle.

[0094] With such a design, the electrolyte can naturally concentrate to the bottom of the second part B2 through the hypotenuse of the triangle, and the bottom of the cross-section with an isosceles triangle shape is a point, so the frictional force of the electrolyte flowing at the bottom of the second part B2 is the smallest, thereby making the flow rate of the electrolyte faster. At the same time, the lengths of the two sides of the isosceles triangle are equal, and the speeds of the electrolyte falling along the two hypotenuses tend to be the same, which is beneficial to improving the uniformity of the electrolyte flow.

[0095] In some embodiments of the present application, continue to refer to Figure 3d 、 Figure 7a and Figure 7b 。The first part B1 has a first side wall C1 arranged around the explosion-proof valve 120, and a second side wall C2 arranged around the first side wall C1. The first side wall C1 has a first boundary line J1 facing away from the inside of the housing 110, and the second side wall C2 has a second boundary line J2 facing away from the inside of the housing 110. Along the direction pointing from the axis of the liquid injection hole A towards the inside of the housing 110, that is, the direction opposite to the first direction F1, the second boundary line J2 is closer to the inside of the housing 110 than the first boundary line J1.

[0096] With such a setting, even if the first part B1 is filled with the electrolyte and the liquid level height of the electrolyte reaches the second boundary line J2, since the second boundary line J2 is closer to the inside of the housing 110 than the first boundary line J1, the electrolyte is not likely to reach the first boundary line J1 and cause the explosion-proof valve 120 to be corroded.

[0097] In some embodiments of the present application, continue to refer to Figure 3a 、 Figure 3d and Figure 7b 。The first part B1 has a first side wall C1 arranged around the explosion-proof valve 120, and a second side wall C2 arranged around the first side wall C1. An exhaust hole P is provided on the first side wall C1.

[0098] "Vent hole P" refers to a passage for releasing the gas inside the device. The housing 1101 inside the housing 110 is connected, and a vent hole P is provided on the explosion-proof valve 120. When the battery is overcharged or over-discharged, extra gas is generated inside the battery. As the internal pressure of the battery increases, the notch H of the explosion-proof valve 120 will deform. The internal gas pressure generates a thrust on the notch H, causing the notch H to deform from concave to convex. If the thrust exceeds the strength of the material at the notch H, the notch H will break, causing the explosion-proof valve 120 to open, and the gas will be discharged from the housing 1101 through the vent hole P, thereby releasing the excessive pressure inside the battery.

[0099] In some embodiments of the present application, reference may continue to Figure 3d , Figure 7a and Figure 7b . Along the direction of the axis of the liquid injection hole A pointing to the inside of the housing 110, the vent hole P is provided at one end of the first side wall C1 away from the inside of the housing 110; and / or, along the direction of the axis of the liquid injection hole A pointing to the inside of the housing 110, the cross-sectional area of the vent hole P shows a decreasing trend.

[0100] Setting the vent hole P at one end of the first side wall C1 away from the inside of the housing 110 makes the bottom of the vent hole P as high as possible above the highest liquid level that the electrolyte will accumulate when it is in the first part B1. Further reduces the risk of the electrolyte entering the explosion-proof valve 120 through the vent hole P. Along the direction of the axis of the liquid injection hole A pointing to the inside of the housing 110, the cross-sectional area of the vent hole P shows a decreasing trend. In the direction away from the inside of the housing 110, which is also the direction away from the electrolyte liquid level, that is, the first direction F1, the vent hole P can be set with a larger size for ventilation. In the direction close to the inside of the housing 110, which is also the direction close to the electrolyte liquid level, the size of the vent hole P is set smaller to further reduce the risk of the electrolyte entering the explosion-proof valve 120 through the vent hole P.

[0101] In addition, since the shape of the explosion-proof valve 120 is mostly an axisymmetric figure, the first part B1 is also set to be axisymmetric, which can ensure the structural strength of the housing 110 and avoid the phenomenon of stress concentration caused by the uneven shape and structure of the concave part B itself.

[0102] Based on the same inventive concept, the embodiments of the present application provide a battery, including the battery cell 100 in any of the above embodiments.

[0103] The battery also has the advantages possessed by the above battery cell 100, which will not be elaborated here.

[0104] Based on the same inventive concept, the embodiments of the present application provide an electrical device, including the battery in any of the above embodiments.

[0105] The electrical device also has the advantages possessed by the above battery, which will not be elaborated here.

[0106] It should be noted that the battery cell 100 disclosed in the embodiments of the present application is used for a battery, and the battery can be but is not limited to being used in power-consuming devices such as vehicles, ships or aircraft. A power supply system of the power-consuming device can be formed by using the battery disclosed in the present application and some other components.

[0107] The embodiments of the present application provide a power-consuming device using a battery as a power source. The power-consuming device can be but is not limited to a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, and the like. Among them, the electric toy can include a fixed or mobile electric toy. For example, a game console, an electric vehicle toy, an electric ship toy, an electric aircraft toy, and the like. The spacecraft can include an airplane, a rocket, a space shuttle, a spaceship, and the like.

[0108] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0109] The above embodiments only represent several implementation manners of the present application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A battery cell, characterized in that: include: The housing comprises a first wall, wherein the first wall is provided with a liquid injection hole; and an explosion-proof valve, disposed on the first wall; Wherein, a recess is provided on the first wall; the recess includes a first part arranged around the explosion-proof valve, and a second part arranged on the side of the first part away from the explosion-proof valve; the first part is connected to the second part; the second part is located on the side of the explosion-proof valve away from the injection hole.

2. The battery cell according to claim 1, characterized in that: The second part has a starting opening and an ending opening arranged along an extending direction of the second part; The starting port and the ending port are both connected to the first part, and the starting port and the ending port are spaced apart.

3. The battery cell according to any one of claims 1 to 2, characterized in that: Along the direction in which the axis of the injection hole points to the interior of the housing, the bottom of the second portion is closer to the interior of the housing than the bottom of the first portion.

4. The battery cell according to claim 3, characterized in that: A connecting surface is defined at a connection point between the first part and the second part, and the connecting surface is connected to a bottom of the first part and a wall of the second part; wherein the orthographic projection of the connecting surface on the reference surface is a line; or The orthographic projection of the connecting surface on the reference surface is a surface, and the orthographic projection of the connecting surface on the reference surface is located within the range of the orthographic projection of the first part on the reference surface; The reference surface is oriented in a direction perpendicular to the axis of the injection hole and pointing toward the interior of the housing.

5. The battery cell according to any one of claims 1 to 2, characterized in that: The second part includes a first section and a second section connecting the first section and the first part; The second section has a first opening communicating with the first section and a second opening communicating with the first portion; The first part has a first side wall arranged around the explosion-proof valve, and a second side wall arranged around the first side wall; the second opening is configured on the second side wall, and the second opening has a first edge and a second edge arranged opposite to each other along an extension direction of the second side wall; The extension trend direction of the second side wall to the first edge is a first target direction, and the extension trend direction of the second side wall to the second edge is a second target direction; The first target direction and the second target direction are opposite to each other, and both the first target direction and the second target direction are perpendicular to a direction in which the second opening points toward the first opening.

6. The battery cell according to claim 5, characterized in that: The second section is arranged to extend linearly between the first opening and the second opening; and / or The second segments are provided with two, one of which is connected to one end of the first segment and the first part, and the other of which is connected to the other end of the first segment and the first part; the part of the first part located between the two second segments is defined as the target part, the target part is set toward the first segment, and the extension trend of the target part is the same as the extension trend of the first segment.

7. The battery cell according to any one of claims 1 to 2, characterized in that: The second part includes a first section and a second section connecting the first section and the first part; Along the direction from the axis of the injection hole to the inside of the shell, the cross-sectional area of ​​the second section tends to decrease.

8. The battery cell according to claim 7, characterized in that: Along the direction from the axis of the injection hole to the inside of the housing, the cross-sectional area of ​​the second section gradually decreases.

9. The battery cell according to claim 8, characterized in that: Along the extension direction of the second section, the cross-sectional shape of the second section is an isosceles triangle.

10. The battery cell according to any one of claims 1 to 2, characterized in that: The first portion has a first side wall disposed around the explosion-proof valve, and a second side wall disposed around the first side wall; The first side wall has a first boundary line facing away from the interior of the shell, and the second side wall has a second boundary line facing away from the interior of the shell; Along the direction of the axis of the injection hole pointing to the inside of the shell, the second boundary line is closer to the inside of the shell than the first boundary line.

11. The battery cell according to any one of claims 1 to 2, characterized in that: The first part comprises a first side wall arranged around the explosion-proof valve, and a second side wall arranged around the first side wall; and an exhaust hole is arranged on the first side wall.

12. The battery cell according to claim 11, characterized in that: The exhaust hole is arranged at an end of the first side wall away from the interior of the shell along the axis of the injection hole pointing to the interior of the shell; and / or Along the direction from the axis of the injection hole to the inside of the shell, the cross-sectional area of ​​the exhaust hole tends to decrease.

13. A battery, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 12.

14. An electrical device, characterized in that: Comprising the battery of claim 13.

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