Battery monomer, battery pack and power utilization device

Abstract

The utility model provides a battery monomer, a battery pack and a power utilization device. The battery monomer comprises a battery cell, an electrolyte and a shell, the shell is provided with a containing cavity. And the battery cell and the electrolyte are arranged in the accommodating cavity. The housing may include a protective shell, an insulating shell, and a bottom tray. And the protective shell is made of a metal material and is used for providing reliable protection for the battery cell and the electrolyte. And the insulating shell is made of an insulating material, wraps the outer side of the battery cell and is used for isolating the battery cell from the protective shell. The bottom supporting plate is made of insulating materials. The bottom supporting plate is arranged at the bottom of the protective shell, and one face of the bottom supporting plate is close to the bottom of the protective shell. And the battery cell and the insulating shell are arranged on the bottom supporting plate together, so that the other surface of the bottom supporting plate is close to the bottom of the battery cell. A plurality of first through holes are formed in the bottom of the insulating shell, and a plurality of second through holes are formed in the bottom supporting plate. The first through hole is communicated with the second through hole, so that gas can be discharged through the first through hole and the second through hole, the phenomena of black spots and dotted lithium precipitation on the battery cell are avoided, and the performance of the battery monomer is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery monomer, a battery pack and a power consumption device. BACKGROUND

[0002] The power consumption device provides power through the battery pack. The battery monomer is the smallest power supply unit in the battery pack, and the battery monomer can include a battery cell, an electrolyte and a shell. The preparation process of the battery monomer includes a formation and capacity distribution process, which is used to charge and discharge the battery monomer to activate the active material in the battery monomer, thereby improving the performance of the battery monomer.

[0003] In the related art, after the formation and capacity distribution, black spots and point-like lithium precipitation phenomena appear on the battery cell, thereby affecting the performance of the battery monomer, further affecting the performance of the battery module and the battery pack, and thereby affecting the use of the power consumption device. UTILITY MODEL CONTENT

[0004] The present application provides a battery monomer, a battery pack and a power consumption device, which avoids the appearance of black spots and point-like lithium precipitation phenomena on the battery cell, and improves the performance of the battery monomer.

[0005] In a first aspect, the present application provides a battery monomer, which includes a battery cell, an electrolyte and a shell. The shell has a receiving cavity. The battery cell and the electrolyte are both arranged in the receiving cavity. The shell can include a protective shell, an insulating shell and a bottom support plate. The protective shell is made of a metal material. The insulating shell is made of an insulating material, and the insulating shell is wrapped on the outside of the battery cell to isolate the battery cell from the protective shell. The bottom support plate is made of an insulating material. The bottom support plate is arranged at the bottom of the protective shell, so that one side of the bottom support plate is close to the bottom of the protective shell. The battery cell and the insulating shell are arranged on the bottom support plate, so that the other side of the bottom support plate is close to the bottom of the battery cell. The insulating shell has a plurality of first through holes at the bottom, and the bottom support plate has a plurality of second through holes. The first through holes and the second through holes are in communication.

[0006] According to the first aspect, the battery monomer includes a battery cell, an electrolyte and a shell. The protective shell of the shell provides reliable protection for the battery cell and the electrolyte inside the shell. The insulating shell of the shell is arranged between the protective shell and the battery cell, which is used to prevent short circuit inside the battery monomer, so as to prolong the service life of the battery monomer. The bottom support plate of the shell is arranged at the bottom of the protective shell, which is used to isolate the bottom of the battery cell from the protective shell, and further prolongs the service life of the battery monomer. The insulating shell has first through holes at the bottom, and the bottom support plate has second through holes at the bottom. The first through holes and the second through holes are in communication, so that the gas generated by the formation and capacity distribution reaction can be discharged from the battery cell through the first through holes and the second through holes, thereby avoiding the appearance of black spots and point-like lithium precipitation phenomena on the battery cell, and improving the performance of the battery monomer.

[0007] In a possible design, the first through hole and the second through hole overlap in a first direction. The first direction is a height direction of the battery monomer.

[0008] Based on the above description of the embodiments, the first through hole at the bottom of the insulating shell and the second through hole at the bottom of the protective shell overlap in the first direction, which can shorten the discharge path of the gas, further avoid the appearance of black spots and point-like lithium precipitation on the battery cell, and further improve the performance of the battery monomer.

[0009] In a possible design, the first through hole and the second through hole do not overlap in a first direction. The first direction is a height direction of the battery monomer.

[0010] Based on the above description of the embodiments, the first through hole at the bottom of the insulating shell and the second through hole at the bottom of the protective shell do not overlap in the first direction, which can prevent other materials in the battery monomer from falling out of the battery cell through the second through hole, thereby ensuring the performance of the battery monomer.

[0011] In a possible design, the second through hole has a larger aperture than the first through hole.

[0012] Based on the above description of the embodiments, the second through hole has a larger aperture than the first through hole, which can increase the flow area of the gas in the battery monomer flowing through the second through hole, avoid the appearance of black spots and point-like lithium precipitation on the battery cell, and further improve the performance of the battery monomer.

[0013] In a possible design, the first through hole has an aperture greater than or equal to 1 mm; and the first through hole has an aperture less than or equal to 1.5 mm.

[0014] Based on the above description of the embodiments, the first through hole has an aperture greater than or equal to 1 mm, which can ensure the flow area of the gas flowing through the first through hole, avoid the appearance of black spots and point-like lithium precipitation on the battery cell, and further improve the performance of the battery monomer. The first through hole has an aperture less than 1.5 mm, which can prevent other materials in the battery cell from falling out of the battery cell through the first through hole and contacting the protective shell made of metal material to cause short circuit, thereby improving the safety and service life of the battery monomer.

[0015] In a possible design, the second through hole has an aperture greater than or equal to 1 mm; and the second through hole has an aperture less than or equal to 2 mm.

[0016] Based on the description of the above embodiments, when the hole diameter of the second through hole is greater than or equal to 1 mm, the flow area of the gas flowing through the second through hole in the battery monomer can be ensured, and the black spot and point lithium precipitation phenomenon on the battery cell can be avoided, thereby further improving the performance of the battery monomer. The hole diameter of the second through hole is less than 2 mm, which can prevent other materials in the battery cell from falling out of the battery cell and contacting the protective shell made of metal material to cause short circuit, thereby improving the safety and service life of the battery monomer 100.

[0017] In a possible design, the first through hole can be formed on the insulating shell through a pressing process.

[0018] Based on the description of the above embodiments, the first through hole is formed on the insulating shell through a pressing process, which can save the process step during the processing of the battery monomer, thereby reducing the production cost of the battery monomer.

[0019] In a possible design, the first through hole corresponds to the center position of the battery cell in the first direction.

[0020] Based on the description of the above embodiments, the first through hole corresponds to the center position of the battery cell in the first direction, which shortens the discharge path of the gas, so that the gas at the center position of the battery cell can be smoothly discharged, thereby avoiding the black spot and lithium precipitation phenomenon at the center position of the battery cell, and further improving the service life of the battery monomer.

[0021] In a second aspect, the application provides a battery pack, comprising a box structure and one or more battery modules. One battery module can include a plurality of battery monomers according to any one of the above embodiments.

[0022] In a third aspect, the application provides a power consumption device comprising the battery pack according to the above embodiments. The battery pack is used to provide electric energy.

[0023] The battery pack provided in the above second aspect and the power consumption device provided in the above third aspect have the beneficial effects of the first aspect and the possible implementation manners of the first aspect, which will not be described here. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0025] Figure 1 The assembly diagram of the insulating shell in the embodiments of the application is shown.

[0026] Figure 2 FIG. 1 is a structural schematic diagram of a battery cell in an embodiment of the present application.

[0027] Figure 3 FIG. 2 is a structural schematic diagram of a battery cell in an embodiment of the present application. Figure 2 FIG. 3 is a sectional view along the A-A direction.

[0028] Figure 4 FIG. 4 is an enlarged view of the B portion in FIG. 3. Figure 3

[0029] Figure 5 FIG. 5 is a structural schematic diagram of an insulating shell in an embodiment of the present application.

[0030] Figure 6 FIG. 6 is a structural schematic diagram of a protective shell bottom in an embodiment of the present application.

[0031] BRIEF DESCRIPTION OF DRAWINGS

[0032] 100 - battery cell;

[0033] 1 - shell; 11 - protective shell; 111 - second through hole; 12 - insulating shell; 121 - first through hole; 122 - crease;

[0034] 2 - battery cell;

[0035] X - first direction. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description herein is for describing the specific embodiments only and not intended to limit the application.

[0038] The terms "comprise" and "have" and any variations thereof in the specification and claims of the present application and the drawings description are intended to cover, without excluding other content. The word "one" or "a" does not exclude the presence of more than one.

[0039] ​Reference to "an embodiment" herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that any of the embodiments described herein can be incorporated into any other embodiment.

[0040] The term "and / or", merely describes association relationship of associated objects, and means that three relationships can exist, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the present application generally means that the front and rear associated objects are in an "or" relationship.

[0041] The orientation words appearing in the following description are the directions shown in the drawings, and are not limited to the specific structure of the application. For example, in the description of the application, the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application.

[0042] In addition, the expressions of the indicating directions for describing the operation and structure of each component of the embodiments, such as X direction, Y direction and Z direction, are not absolute but relative, and although these indications are appropriate when each component is in the position shown in the drawings, these directions should be interpreted differently to correspond to the changes when these positions change.

[0043] In addition, the terms "first", "second", and the like in the specification and claims of the application or the above drawings are used to distinguish different objects, and are not used to describe a particular order, and can explicitly or implicitly include one or more of the features.

[0044] In the description of the application, unless otherwise specified, the meaning of "a plurality of" is two or more (including two), and similarly, "a plurality of groups" means two or more groups (including two groups).

[0045] In the description of the present application, it should be noted that unless specifically defined and limited otherwise, the terms "mounting", "connected", "connection" should be understood broadly, for example, the "connection" of the mechanical structure can mean the physical connection, for example, the physical connection can be a fixed connection, for example, a fixed connection by a screw, bolt or other fixing member; the physical connection can also be a detachable connection, for example, a mutual clamping or clamping connection; the physical connection can also be integrally connected, for example, welding, bonding or integrally formed connection. The "connection" or "connection" of the circuit structure can mean electrical connection or signal connection, for example, it can be directly connected, that is, physically connected, or indirectly connected through at least one intermediate element, as long as the circuit is connected, it can also be the internal connection of two elements; signal connection can be signal connection through circuit, or signal connection through media medium, for example, radio wave. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0046] The electric device refers to an electrical equipment that uses electric energy to complete a specific function. The electric device can include, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric car, an electric vehicle, a ship, a spacecraft, etc. Among them, the electric vehicle can include an electric commercial vehicle, an electric passenger vehicle, an electric bus and an electric heavy truck, etc. The above electric device provides electric energy through the battery pack, so that the above electric device can provide various functions or services.

[0047] The battery pack can include a box structure and a battery module. Among them, the box structure is used to accommodate and protect the battery module. The battery module can include a plurality of series or parallel connected battery monomers.

[0048] The battery monomer can include an electrode core, an electrolyte and a shell. Among them, the electrode core and the electrolyte are arranged in the shell, the shell is used to accommodate and protect the electrode core, and is used to discharge waste substances. The waste substances include heat energy and gas generated when the electrode core and the electrolyte undergo charge and discharge reactions. Specifically, the charge and discharge reaction is an electrochemical reaction, which can convert chemical energy into electric energy.

[0049] The preparation process of the battery monomer includes a formation and capacity distribution process, which is used to charge and discharge the battery monomer to activate the active material in the battery monomer, so as to improve the performance of the battery monomer.

[0050] In the related art, after the formation and capacity distribution, black spots and point-like lithium precipitation phenomenon appear on the electrode core of the battery monomer, which affects the performance of the battery monomer, further affects the performance of the battery module and the battery pack, and thus affects the use of the electric device.

[0051] Based on this, this application provides a battery cell, a battery pack, and an electrical device. By opening a first through hole in the insulating shell of the casing, the gas inside the casing can be smoothly discharged to the outside of the battery cell, thereby avoiding black spots and point-like lithium plating on the cell and improving the performance of the battery cell. The following is in conjunction with... Figures 1-6 Please provide a detailed explanation.

[0052] In a first aspect, this application provides a battery cell 100, which may include a cell 2, an electrolyte (not shown in the figure), and a casing 1. The casing 1 has a receiving cavity. Both the cell 2 and the electrolyte are disposed in the receiving cavity. The casing 1 may include a protective shell (not shown in the figure), an insulating shell 12, and a bottom plate 11. The protective shell is made of metal. The insulating shell 12 is made of insulating material and wraps around the outside of the cell 2 to isolate the cell 2 from the protective shell. The bottom plate 11 is made of insulating material. The bottom plate 11 is disposed at the bottom of the protective shell, with one side of the bottom plate 11 close to the bottom of the protective shell. The cell 2 and the insulating shell 12 are disposed together on the bottom plate 11, with the other side of the bottom plate 11 close to the bottom of the cell. The bottom of the insulating shell 12 is provided with a plurality of first through holes 121, and the bottom plate 11 is provided with a plurality of second through holes 111. The first through holes 121 communicate with the second through holes 111.

[0053] Cell 2 includes a positive electrode (not shown in the figure), a negative electrode (not shown in the figure), and a separator (not shown in the figure). Cells 2 are formed by stacking and winding the positive electrode, negative electrode, and separator layers in that order.

[0054] The electrolyte can undergo charge-discharge reactions with the positive and negative electrodes to achieve electron migration between them.

[0055] Based on this, the cell 2 can be immersed in the electrolyte, so that the positive and negative electrode plates can be in full contact with the electrolyte, thereby improving the charge and discharge performance of the battery cell 100.

[0056] like Figures 1-3 The housing 1 shown has a receiving cavity. Both the battery cell 2 and the electrolyte are disposed within the receiving cavity. The housing 1 serves to protect the battery cell 2 and prevent electrolyte leakage.

[0057] Specifically, such as Figure 4 As shown, the housing 1 may include a protective shell and an insulating shell 12. The protective shell is made of a metallic material, giving it good structural strength and thermal conductivity. The good structural strength provides reliable protection for the battery cell 2 and electrolyte inside the housing 1. The thermal conductivity allows heat generated by chemical reactions occurring within the housing 1 to dissipate promptly, keeping the battery cell 100 at a suitable operating temperature and thus extending its lifespan. These chemical reactions may include, but are not limited to, charge-discharge reactions and electrolyte formation and capacity-building reactions.

[0058] The insulating shell 12 is made of insulating material, such as PP material. The insulating shell 12 is wrapped on the outer side of the electric core 2, for isolating the electric core 2 from the protective shell, so as to prevent internal short circuit of the battery monomer 100, thereby prolonging the service life of the battery monomer 100.

[0059] Further, as shown in Figure 1 the insulating shell 12 is wrapped on the outer side of the electric core 2, there are two rounded corners of the electric core 2 at the bottom which cannot be completely wrapped by the insulating shell 12. Based on this, the bottom supporting plate 11 is arranged at the bottom of the protective shell, and the electric core 2 wrapped by the insulating shell 12 is arranged on the bottom supporting plate 11, so that one side of the bottom supporting plate 11 is close to the bottom of the protective shell, and the other side of the bottom supporting plate 11 is close to the bottom of the electric core 2. Further, the area of the bottom supporting plate 11 is greater than the bottom surface area of the electric core 2, so that the bottom supporting plate 11 can completely isolate the bottom of the electric core 2 from the protective shell, prevent internal short circuit of the battery monomer 100, thereby further prolonging the service life of the battery monomer 100.

[0060] In order to improve the energy density, power performance and cycle life of the battery monomer 100, it is necessary to compact the positive plate, negative plate and separator in the electric core 2. When the compaction density is too large, the positive plate and negative plate located at the winding center of the electric core 2 cannot be fully soaked in the electrolyte, thereby affecting the charge and discharge performance of the monomer battery. Moreover, when the compaction density is too large, the porosity inside the electric core 2 is reduced, and the formation and capacity reaction causes the electrolyte to react on the surface of the positive plate and / or negative plate, thereby generating gas. The above-mentioned gas cannot be smoothly discharged from the electric core 2, resulting in black spots and lithium precipitation of the electric core 2, thereby affecting the various performances of the electric core 2.

[0061] Based on this, as shown in Figure 5 and Figure 6 the first through hole 121 is arranged at the bottom of the insulating shell 12, and the second through hole 111 is arranged on the bottom supporting plate 11. The first through hole 121 and the second through hole 111 are in communication, so that the above-mentioned gas can be discharged from the shell 1 through the first through hole 121 and the second through hole 111, thereby avoiding the above-mentioned gas causing black spots and lithium precipitation of the electric core 2, thereby ensuring the various performances of the electric core 2.

[0062] Specifically, there is a gap between the bottom of the insulating shell 12 and the bottom supporting plate 11, and the first through hole 121 and the second through hole 111 can be in communication through the above-mentioned gap.

[0063] In summary, the battery cell 100 provided by the application comprises an electric core 2, an electrolyte and a shell 1. The protective shell of the shell 1 provides reliable protection for the electric core 2 and the electrolyte inside the shell 1. The insulating shell 12 of the shell 1 is wrapped outside the electric core 2, which is used to isolate the electric core from the protective shell, prevent short circuit inside the battery cell 100, and prolong the service life of the battery cell 100. The bottom support plate 11 of the shell 1 is arranged at the bottom of the protective shell, which is used to isolate the bottom of the electric core 2 from the protective shell, and further prolong the service life of the battery cell. The first through hole 121 is arranged at the bottom of the insulating shell 12, and the second through hole 111 is arranged on the bottom support plate 11. The first through hole 121 and the second through hole 111 are communicated, so that the gas generated by the formation and dispensing reaction can be discharged from the electric core 2 through the first through hole 121 and the second through hole 111, thereby avoiding the black spot and point-like lithium precipitation phenomenon on the electric core 2, and improving the performance of the battery cell 100.

[0064] Further, the positional relationship between the first through hole 121 and the second through hole 111 can include the following two kinds:

[0065] Positional relationship one: the first through hole 121 and the second through hole 111 overlap in the first direction X. Wherein, as shown in the figure, the first direction X is the height direction of the battery cell 100. Figures 2-4

[0066] The above-mentioned gas is discharged to the outside of the electric core 2 along the first direction X. Therefore, when the first through hole 121 and the second through hole 111 overlap in the first direction X, the first through hole 121 and the second through hole 111 are connected into a straight line channel. The above-mentioned gas is directly discharged to the outside of the electric core 2 through the above-mentioned straight line channel, which can shorten the discharge path of the gas, further avoid the black spot and point-like lithium precipitation phenomenon on the electric core 2, and thereby improve the performance of the battery cell 100.

[0067] In summary, the first through hole 121 at the bottom of the insulating shell 12 and the second through hole 111 on the bottom support plate 11 overlap in the first direction X, which can shorten the discharge path of the gas, avoid the black spot and point-like lithium precipitation phenomenon on the electric core 2, and thereby further improve the performance of the battery cell 100.

[0068] Positional relationship two: the first through hole 121 and the second through hole 111 do not overlap in the first direction X. Wherein, the first direction X is the height direction of the battery cell 100.

[0069] ​When the first through hole 121 and the second through hole 111 do not overlap in the first direction X, the above-mentioned gas is discharged to the gap between the bottom of the insulating shell 12 and the bottom support plate 11 through the first through hole 121, and then discharged to the outside of the battery cell 2 through the second through hole. At this time, when other materials in the electrolyte pass through the first through hole 121 together with the gas, the other materials are blocked by the bottom support plate 11, and the gas is discharged to the outside of the battery cell 2 through the above-mentioned gap and the second through hole 111, so that the above-mentioned other materials can be prevented from falling out of the battery cell 2 through the second through hole 111, thereby ensuring the performance of the battery monomer 100.

[0070] In summary, the first through hole 121 at the bottom of the insulating shell 12 and the second through hole 111 on the bottom support plate 11 do not overlap in the first direction X, which can prevent other materials in the battery monomer 100 from falling out of the battery cell 2 through the second through hole 111, thereby ensuring the performance of the battery monomer 100.

[0071] Further, the first through hole 121 and the second through hole 111 are specifically defined in the present application.

[0072] In some embodiments, the aperture of the second through hole 111 is larger than the aperture of the first through hole 121.

[0073] Obviously, the larger the apertures of the first through hole 121 and the second through hole 111, the larger the flow area of the above-mentioned gas.

[0074] However, in order to prevent other materials in the battery monomer 100 from falling through the first through hole 121 and contacting the protective shell of the metal material to cause short circuit, the aperture of the first through hole 121 cannot be effectively enlarged. Therefore, the aperture of the second through hole 111 is enlarged so that the aperture of the second through hole 111 is larger than the aperture of the first through hole 121, so as to increase the flow area of the gas and thus facilitate the discharge of the gas.

[0075] In summary, making the aperture of the second through hole 111 larger than the aperture of the first through hole 121 can increase the flow area of the gas flowing through the second through hole 111 in the battery monomer, avoid the appearance of black spots and point-like lithium precipitation on the battery cell 2, and thus further improve the performance of the battery monomer 100.

[0076] Specifically, in some embodiments, the aperture of the first through hole 121 is greater than or equal to 1 mm; and the aperture of the first through hole 121 is less than or equal to 1.5 mm.

[0077] According to the description of the above embodiment, the first through hole 121 has a hole diameter greater than or equal to 1 mm, which can ensure the flow area of the gas flowing through the first through hole 121, avoid the black spots and point-like lithium precipitation phenomenon on the battery cell 2, and further improve the performance of the battery monomer 100. The hole diameter of the first through hole 121 is less than 1.5 mm, which can prevent other materials in the battery cell 2 from falling out of the battery cell 2 and contacting the metal protective shell to cause short circuit, thereby improving the safety and service life of the battery monomer 100.

[0078] In some embodiments, the second through hole 111 has a hole diameter greater than or equal to 1 mm; and the second through hole 111 has a hole diameter less than or equal to 2 mm.

[0079] According to the description of the above embodiment, the second through hole 111 has a hole diameter greater than or equal to 1 mm, which can ensure the flow area of the gas flowing through the second through hole 111, avoid the black spots and point-like lithium precipitation phenomenon on the battery cell 2, and further improve the performance of the battery monomer 100. The hole diameter of the second through hole 111 is less than 2 mm, which can prevent other materials in the battery cell 2 from falling out of the battery cell 2 and contacting the metal protective shell to cause short circuit, thereby improving the safety and service life of the battery monomer 100.

[0080] Further, in some embodiments, the first through hole 121 can be formed on the insulating shell 12 by a pressing process.

[0081] The pressing process refers to a way of pressing a groove mark or a through hole on a pressed object. Therefore, the pressing process can be used to process the crease 122 of the insulating shell 12 and the first through hole 121, saving the process steps during the processing of the battery monomer 100, thereby reducing the production cost of the battery monomer 100.

[0082] Specifically, as shown in Figure 1 and Figure 5 , the crease 122 needs to be provided on the insulating shell 12 to enable the insulating shell 12 to wrap the bottom surface and the side surface of the battery cell 2 at the same time, thereby further achieving the isolation of the battery cell 2 and the protective shell, and preventing short circuit inside the battery monomer 100.

[0083] According to the description of the above content, the first through hole 121 is formed on the insulating shell 12 by a pressing process, which can save the process steps during the processing of the battery monomer 100, thereby reducing the production cost of the battery monomer 100.

[0084] Specifically, the shape of the first through hole 121 and the second through hole 111 can include but is not limited to a circular shape, a cross shape, an X shape, etc. The shape of the first through hole 121 and the second through hole 111 does not affect the flow area of the gas in the battery monomer 100.

[0085] Further, since the battery cell 2 is composed of a plurality of layers of positive electrode sheets, negative electrode sheets and separators stacked and wound, the center of the battery cell 2 is the starting point of the winding. After the battery cell 2 is compacted, the center of the battery cell 2 has a higher compacted density and is more likely to have black spots and lithium precipitation.

[0086] Based on this, the present application also makes the following improvements:

[0087] In some embodiments, the first through hole 121 corresponds to the center position of the battery cell 2 in the first direction X.

[0088] When the first through hole 121 corresponds to the center position of the battery cell 2, the distance between the center position of the battery cell 2 and the first through hole 121 is the shortest, shortening the discharge path of the gas.

[0089] According to the description of the above embodiments, the first through hole 121 corresponds to the center position of the battery cell 2 in the first direction X, shortening the discharge path of the gas, so that the gas at the center position of the battery cell 2 can be discharged smoothly, thereby avoiding the occurrence of black spots and lithium precipitation at the center position of the battery cell 2, and further improving the life of the battery monomer 100.

[0090] In a second aspect, the present application provides a battery pack, comprising a box structure and one or more battery modules. One battery module can include a plurality of battery monomers according to any one of the above embodiments.

[0091] In a third aspect, the present application provides a power device, comprising the battery pack according to the above embodiments. The battery pack is used to provide electric energy.

[0092] Those skilled in the art can understand that although some embodiments herein include certain features included in other embodiments rather than other features, the combination of features of different embodiments means that it is within the scope of the present application and forms different embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.

[0093] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cell, characterized by, The battery monomer comprises: an electric core, an electrolyte and a shell; the shell has a containing cavity; the electric core and the electrolyte are both arranged in the containing cavity; the shell comprises a protective shell, an insulating shell and a bottom supporting plate; the protective shell is made of metal material; the insulating shell is made of insulating material, and the insulating shell is wrapped outside the electric core for isolating the electric core from the protective shell; the bottom supporting plate is made of insulating material; the bottom supporting plate is arranged at the bottom of the protective shell, and one side of the bottom supporting plate is close to the bottom of the protective shell; the electric core and the insulating shell are arranged on the bottom supporting plate together, and the other side of the bottom supporting plate is close to the bottom of the electric core; the insulating shell is provided with a plurality of first through holes at the bottom; the bottom supporting plate is provided with a plurality of second through holes; the first through holes and the second through holes are in communication.

2. The battery cell of claim 1, wherein, the first through holes and the second through holes overlap in the first direction; wherein the first direction is the height direction of the battery monomer.

3. The battery cell of claim 1, wherein, the first through holes and the second through holes do not overlap in the first direction; wherein the first direction is the height direction of the battery monomer.

4. The battery cell according to claim 2 or 3, characterized in that, the aperture of the second through hole is larger than the aperture of the first through hole.

5. The battery cell of claim 4, wherein, the aperture of the first through hole is greater than or equal to 1mm; and the aperture of the first through hole is less than or equal to 1.5mm.

6. The battery cell of claim 5, wherein, the aperture of the second through hole is greater than or equal to 1mm; and the aperture of the second through hole is less than or equal to 2mm.

7. The battery cell of claim 1, wherein, the first through hole is formed on the insulating shell by a press mark process.

8. The battery cell according to claim 2 or 3, characterized in that, the first through hole corresponds to the center position of the electric core in the first direction.

9. A battery pack, characterized by, The battery pack comprises a box structure and one or more battery modules; wherein one battery module comprises the battery monomer of any one of claims 1-8.

10. An electrical device, characterized by The battery pack of claim 9; the battery pack is used for providing electric energy.

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