Battery assembly and battery

Abstract

The utility model relates to a battery assembly and a battery, the battery assembly comprises: a positive plate, one side of which is provided with a protruding lead-out part; the insulating part is arranged above the positive plate, a protruding part is arranged in the middle area of the insulating part, and the protruding part is arranged on the periphery of the leading-out part in a sleeving mode; the negative plate is arranged above the insulating part, and a through hole is formed in the middle area of the negative plate; the negative plate, the insulating part and the positive plate are sequentially stacked, and the protruding part is arranged in the through hole in a penetrating manner. The direct contact between the positive electrode and the negative electrode is effectively isolated through the insulating part, and the short circuit phenomenon possibly occurring in the charging and discharging process of the battery is avoided. Meanwhile, the tight fit between the protruding part and the leading-out part further enhances the insulation effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery assembly and a battery. BACKGROUND

[0002] In the conventional battery design mode, the positive and negative electrodes are arranged on the same side. For common 1.5-4.5V low-voltage batteries, when the distance between the metal electrodes is reduced to below millimeters in a dry air environment, the risk of battery discharge increases as the distance decreases. In a humid air environment or a high-voltage environment containing electrolyte, an unreasonable electrode spacing design will directly lead to a decrease in battery performance, a large amount of energy loss, and even cause safety hazards.

[0003] In the design of cylindrical batteries, the positions and shapes of the positive and negative electrodes are adjusted to maintain a proper spacing in the radial dimension, and a buffer structure such as a sponge-like insulating material is arranged between the positive and negative electrodes to prevent the positive and negative electrodes from approaching under the action of external force. For large batteries or battery packs, the positive and negative electrodes are divided into multiple sub-regions, and each sub-region is connected by an independent circuit to reduce the influence of the close proximity of the positive and negative electrodes in a single region, and the charging and discharging states of each sub-region are balanced through circuit control to reduce polarization and self-discharge phenomena.

[0004] However, due to the complexity and uncertainty of the assembly process, expensive CCD vision detection systems need to be introduced, resulting in a significant increase in battery manufacturing costs and a decline in market competitiveness. Secondly, foreign matter such as burrs and metal dust in the electrode manufacturing process may be mixed into the positive and negative electrode gap, which may cause indirect discharge phenomena, especially in a high-humidity environment, these foreign matter is more likely to form a micro-electrolytic cell, accelerating the battery discharge process, and seriously affecting the service life and safety of the battery.

[0005] In summary, the existing battery assembly has the problems of insufficient safety, poor reliability, high manufacturing difficulty and high cost. CONTENT OF THE INVENTION

[0006] Therefore, it is necessary to provide a battery assembly and a battery to solve the problems of insufficient safety and reliability of the existing battery assembly.

[0007] A battery assembly comprises:

[0008] a positive electrode sheet having a protruding lead-out portion on one side;

[0009] an insulating piece arranged above the positive electrode sheet, wherein a protruding portion is arranged in the middle region of the insulating piece, and the protruding portion is sleeved around the outer periphery of the lead-out portion;

[0010] a negative electrode sheet arranged above the insulating piece, wherein a through hole is arranged in the middle region of the negative electrode sheet;

[0011] The negative electrode sheet, the insulating piece and the positive electrode sheet are sequentially stacked, and the protruding part is arranged in the through hole.

[0012] In one of the embodiments, one end of the protruding part inserted into the through hole is higher than the surface of the negative electrode sheet far from the insulating piece, and one end of the leading-out part inserted into the protruding part is lower than the one end of the protruding part inserted into the through hole.

[0013] In one of the embodiments, the insulating piece comprises an insulating body and a protruding part arranged on one side surface of the insulating body, and the protruding part comprises a channel arranged in the middle region of the insulating body, which is sleeved on the outer periphery of the leading-out part.

[0014] In one of the embodiments, the protruding part is a cylindrical structure protruding outward from one side surface of the insulating body, and the channel is a cylindrical channel longitudinally penetrating through the cylindrical structure and the insulating body.

[0015] In one of the embodiments, the positive electrode sheet comprises a positive electrode body and a leading-out part, and the leading-out part is a circular boss protruding outward from one side surface of the positive electrode body.

[0016] In one of the embodiments, the negative electrode sheet comprises a negative electrode body and a through hole, and the through hole is a circular through hole longitudinally penetrating through the middle region of the negative electrode body.

[0017] In one of the embodiments, the surface of the negative electrode body is provided with a nickel plating layer and a plurality of penetrating holes.

[0018] In one of the embodiments, the diameter of the negative electrode body is greater than the diameters of the insulating body and the positive electrode body, and the diameter of the insulating body is greater than the diameter of the positive electrode body.

[0019] In one of the embodiments, the insulating piece comprises a first melting point layer, a second melting point layer and a third melting point layer sequentially stacked, and the melting point of the second melting point layer is higher than the melting points of the first melting point layer and the second melting point layer.

[0020] The above battery assembly, the arrangement of the insulating piece effectively isolates the direct contact between the positive and negative electrodes, avoiding the short circuit phenomenon that may occur during the charging and discharging process of the battery. At the same time, the close cooperation of the protruding part and the leading-out part further enhances the insulation effect. Due to the isolation effect of the insulating piece, even if the battery is subjected to external impact or vibration during use, accidental contact and short circuit between the positive and negative electrodes can be effectively prevented, improving the safety and reliability of the battery. The design of the leading-out part of the positive electrode sheet makes the connection of the battery with external circuits or devices more convenient and stable.

[0021] According to another purpose of the present application, a battery is also provided, which comprises the above battery assembly.

[0022] The battery, which adopts the battery assembly of the positive electrode sheet, the insulating piece and the negative electrode sheet, improves the safety and reliability of the battery, and the battery assembling process is simple and efficient, which reduces the production cost and improves the production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is an explosion schematic diagram of the battery assembly.

[0024] Figure 2 It is a front schematic diagram of the battery assembly.

[0025] Figure 3 It is a cross-sectional schematic diagram of the battery assembly.

[0026] Figure 4 It is a cross-sectional schematic diagram of the negative electrode sheet.

[0027] Figure 5 It is a cross-sectional schematic diagram of the insulating piece.

[0028] Figure 6 It is a cross-sectional schematic diagram of the positive electrode sheet.

[0029] In the figure: 1, positive electrode sheet; 10, leading-out part; 11, positive electrode body;

[0030] 2, insulating piece; 20, protruding part; 21, insulating body; 22, channel; 23, first melting point layer; 24, second melting point layer; 25, third melting point layer;

[0031] 3, negative electrode sheet; 30, through hole; 31, negative electrode body; 32, small hole. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are described in detail below. In the following description, a lot of specific details are set forth in order to fully understand 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 spirit of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0033] In the description of the application, it should be understood that, if there are these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the application and simplifying the description, and do not 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 a limitation on the application.

[0034] In addition, if there are these terms "first", "second", these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the application, if the term "multiple" appears, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0035] In this application, unless otherwise explicitly specified and limited, if there are terms such as "mounting", "connecting", "connecting", "fixing" and the like, these terms should be broadly understood. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0036] In this application, unless otherwise explicitly specified and limited, if there are similar descriptions such as "first feature on or under second feature", the meaning can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" of the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" of the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0037] It is to be noted that when an element such as a layer, film, region, or substrate is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. In addition, it is to be understood that when a method is referred to as comprising a step or comprising a specific combination of steps, the method can include additional or other steps even though not specifically disclosed.

[0038] Referring to Figure 1 , Figure 1 An exploded view of a battery assembly in an embodiment of the present application is shown. The battery assembly provided in an embodiment of the present application includes a positive electrode sheet 1, a negative electrode sheet 3, and an insulating member 2. By optimizing the structural layout inside the battery assembly, the safety and reliability of the battery are improved.

[0039] Specifically, the positive electrode sheet 1 is provided with a protruding lead-out portion 10 on one side. The insulating member 2 is disposed above the positive electrode sheet 1, and a protruding portion 20 is provided in the middle region of the insulating member 2. The protruding portion 20 is sleeved around the outer periphery of the lead-out portion 10. The negative electrode sheet 3 is disposed above the insulating member 2, and a through hole 30 is provided in the middle region of the negative electrode sheet 3. The negative electrode sheet 3, the insulating member 2, and the positive electrode sheet 1 are sequentially stacked, and the protruding portion 20 is disposed through the through hole 30.

[0040] In the assembly process of the battery assembly, the positive electrode sheet 1, the insulating member 2, and the negative electrode sheet 3 are sequentially placed from bottom to top. The insulating member 2 is placed above the positive electrode sheet 1, and at the same time, it is necessary to ensure that the protruding portion 20 is sleeved around the outer periphery of the lead-out portion 10 of the positive electrode sheet 1. Then, the negative electrode sheet 3 is placed above the insulating member 2, so that the through hole 30 is aligned with the protruding portion 20 and is smoothly disposed through.

[0041] In one embodiment, the positive electrode sheet 1 is made of a metal material with good electrical conductivity, such as copper, aluminum, or an alloy thereof. In this embodiment, the positive electrode sheet 1 is provided with a protruding lead-out portion 10 in the middle region, which is used to connect with external circuits or devices to realize the discharging or charging function of the battery. The shape and size of the lead-out portion 10 can be adjusted according to actual needs.

[0042] In one embodiment, the insulating member 2 is arranged above the positive electrode sheet 1 to isolate the positive and negative electrodes and prevent short circuit. The insulating member 2 is made of a material with excellent insulation properties, such as plastic, rubber, or ceramic. In this embodiment, the middle region of the insulating member 2 is provided with a protruding portion 20 that is sleeved around the outer periphery of the lead-out portion 10 of the positive electrode sheet 1. The protruding portion 20 is shaped and sized to match the lead-out portion 10 to ensure a tight fit therebetween. At the same time, the protruding portion 20 also has a certain elasticity to accommodate the slight deformation of the positive electrode sheet 1 during assembly.

[0043] In one embodiment, the negative electrode sheet 3 is arranged above the insulating member 2 and is also made of a metal material with good electrical conductivity, such as nickel, iron, or an alloy thereof. In this embodiment, the middle region of the negative electrode sheet 3 is provided with a through hole 30 for accommodating the protruding portion 20 of the insulating member 2. The through hole 30 is shaped and sized to match the protruding portion 20 to ensure smooth threading therebetween. The negative electrode sheet 3 is arranged in a stacked manner with the insulating member 2 and the positive electrode sheet 1 through the through hole 30 to form a complete battery assembly structure.

[0044] As described above, the arrangement of the insulating member 2 effectively isolates the direct contact between the positive and negative electrodes, avoiding the short circuit phenomenon that may occur during the charging and discharging process of the battery. At the same time, the tight fit of the protruding portion 20 with the lead-out portion 10 further enhances the insulation effect. Due to the isolation effect of the insulating member 2, even if the battery is subjected to external impact or vibration during use, accidental contact and short circuit between the positive and negative electrodes can be effectively prevented, improving the safety and reliability of the battery. The design of the lead-out portion 10 of the positive electrode sheet 1 makes the connection of the battery with external circuits or devices more convenient and stable.

[0045] In combination with FIGS. 1-4, Figure 2 Figure 3 Figure 2 Figure 3 are provided front view and cross-sectional view of the battery assembly in one embodiment of the present application. In some embodiments, the end of the protruding portion 20 that extends into the through hole 30 is higher than the surface of the negative electrode sheet 3 away from the insulating member 2; and the end of the lead-out portion 10 that extends into the protruding portion 20 is lower than the end of the protruding portion 20 that extends into the through hole 30.

[0046] Specifically, the end of the protruding portion 20 that extends into the through hole 30 is higher than the surface of the negative electrode sheet 3 away from the insulating member 2, which not only ensures the insulation effect but also facilitates the subsequent installation and fixation of the negative electrode sheet 3.

[0047] Further, the end of the lead-out portion 10 that extends into the protruding portion 20 of the insulating member 2 is lower than the end of the protruding portion 20 that extends into the through hole 30 of the negative electrode sheet 3, which not only ensures the reliability of the connection with the external but also avoids direct contact with the negative electrode sheet 3, thereby effectively preventing short circuit.​​​

[0048] in combination Figure 5 as shown, Figure 5 is a cross-sectional view of an insulating piece provided in an embodiment of the present application. In some embodiments, the insulating piece 2 comprises an insulating body 21 and a protruding portion 20.

[0049] Specifically, the insulating piece 2 comprises an insulating body 21 and a protruding portion 20, the protruding portion 20 being outwardly provided on one side surface of the insulating body 21. In particular, the protruding portion 20 comprises a channel 22 provided in the middle region of the insulating body 21, the channel 22 being sleeved on the outer periphery of the lead-out portion 10 of the positive plate 1, thereby ensuring the insulation effect and facilitating the positioning and fixing of the lead-out portion 10 of the positive plate 1.

[0050] In one of the embodiments, the protruding portion 20 is a cylindrical structure outwardly protruding from one side surface of the insulating body 21, and the channel 22 is a cylindrical channel longitudinally penetrating through the cylindrical structure and the insulating body 21.

[0051] Specifically, the protruding portion 20 is a cylindrical structure outwardly protruding from one side surface of the insulating body 21, and the channel 22 is a cylindrical channel longitudinally penetrating through the cylindrical structure and the insulating body 21.

[0052] In one of the embodiments, the insulating piece 2 comprises a first melting point layer 33, a second melting point layer 34 and a third melting point layer 35 which are sequentially stacked.

[0053] Specifically, the insulating piece 2 is composed of a first melting point layer 33, a second melting point layer 34 and a third melting point layer which are sequentially stacked. The melting point of the second melting point layer 34 is higher than that of the first melting point layer 33 and the third melting point layer. In this embodiment, the first melting point layer 33 and the third melting point layer are low melting point layers, and the melting point temperature is set in a lower range; while the second melting point layer 34 is a high melting point layer, and the melting point temperature is set in a higher range. In this way, the layered structure of the insulating piece 2 is designed to selectively melt the low melting point layer as needed while maintaining the integrity of the high melting point layer during the hot melting operation, thereby ensuring that there is sufficient safety distance between the positive and negative electrodes to prevent short circuit of the battery.

[0054] Further, the melting point temperature of the entire insulation piece 2 is in the range of 85°C to 250°C, which is set to ensure the feasibility of hot melting operation and avoid safety hazards caused by excessively high temperature in normal use.

[0055] In the embodiment, the insulation piece 2 adopts a three-layer PP glue structure, which has excellent insulation performance and thermal stability and can meet the use requirements of the battery assembly. Preferably, the insulation piece 2 can be selected from one of modified acrylic glue, modified epoxy resin glue, fluorinated silicone glue, fluorinated polymer glue, organic silicone glue, polyurethane glue, silicone glue, polyolefin resin, polyisobutylene rubber, tackifying resin, etc.

[0056] As described above, the design of the protruding part 20 of the insulation piece 2 and the high melting point layer of the layered structure effectively isolates the direct contact between the positive and negative electrodes and avoids the short circuit phenomenon that may occur in the charging and discharging process of the battery. The design of the cylindrical channel 22 of the insulation piece 2 and the feasibility of hot melting operation make the assembly process of the battery assembly more convenient and efficient. The insulation piece 2 is sleeved on the lead-out part 10 of the positive plate 1, which ensures that the spacing between the positive and negative electrodes is uniformly distributed, and the insulation glue is uniformly spaced between the positive and negative electrodes, effectively preventing local short circuit.

[0057] In combination with Figure 6 as shown, Figure 6 is a cross-sectional schematic view of the positive plate provided in an embodiment of the present application. In some embodiments, the positive plate 1 includes a positive body 11 and a lead-out part 10, and the lead-out part 10 is a circular boss formed by the outward protrusion of one side surface of the positive body 11.

[0058] Specifically, the lead-out part 10 is a circular boss formed by the outward protrusion of one side surface of the positive body 11. In the embodiment, the height of the boss is set to 0.3 mm to ensure that it can be tightly matched with the insulation piece 2 in the subsequent assembly process, so that the positive plate 1 can be accurately placed on the insulation piece 2, ensuring that the spacing between the positive and negative electrodes is uniformly distributed and preventing local short circuit, while not affecting the assembly efficiency and battery performance due to excessively high or low.

[0059] Further, the lead-out part 10 is made of AL3301 material, which is a high-performance aluminum alloy material with excellent electrical conductivity, which can ensure the charging and discharging efficiency of the battery. Moreover, the high strength and corrosion resistance of the AL3301 material enable the positive plate 1 to maintain stable performance in harsh use environments, which helps to prolong the service life of the battery and improve the reliability of the battery.

[0060] In combination with Figure 4 as shown, Figure 4A cross-sectional view of a negative electrode sheet according to an embodiment of the present application is shown in FIG. 1. In some embodiments, the negative electrode sheet 3 includes a negative electrode body 31 and a through-hole 30, which is a circular through-hole 30 longitudinally through the middle region of the negative electrode body 31.

[0061] Specifically, the negative electrode body 31 is made of sus316L material with a thickness of 0.15 mm. Sus316L is a high-performance stainless steel material with excellent corrosion resistance, strength, and toughness. During long-term use of the battery, it can effectively resist the corrosion of chemical substances such as electrolyte, thereby ensuring the stability and service life of the negative electrode sheet 3.

[0062] Further, the through-hole 30 is a circular through-hole 30 longitudinally through the middle region of the negative electrode body 31, which matches the cylindrical structure of the insulating piece 2, achieving precise positioning of the insulating piece 2 on the negative electrode sheet 3. The presence of the through-hole 30 not only improves the assembly efficiency of the battery, but also ensures the compactness and stability of the internal structure of the battery.

[0063] In one embodiment, the surface of the negative electrode body 31 is provided with a nickel plating layer and a plurality of small holes 32.

[0064] Specifically, the nickel plating layer on the surface of the negative electrode body 31 can improve the corrosion resistance and electrical conductivity of the negative electrode body 31, protecting the negative electrode body 31 from the corrosion of the electrolyte.

[0065] Further, the small holes 32 have a dual role. On the one hand, the small holes 32 serve as electrode lead-through channels 22 inside the battery, allowing the negative electrode sheet 3 to be electrically connected to external circuits or devices. On the other hand, after the battery fails, the small holes 32 can serve as pressure relief channels 22 to release the internal pressure of the battery in a timely manner, preventing safety accidents such as explosion of the battery.

[0066] In one embodiment, the diameter of the negative electrode body 31 is greater than the diameters of the insulating body 21 and the positive electrode body 11, and the diameter of the insulating body 21 is greater than the diameter of the positive electrode body 11, ensuring that the negative electrode sheet 3, the insulating piece 2, and the positive electrode sheet 1 can form a close contact during assembly, while ensuring the stability and compactness of the internal structure of the battery.

[0067] As described above, the use of sus316L material and nickel plating layer on the negative electrode sheet 3, as well as the design of the through-hole 30 and the small hole 32, improves the overall performance and safety of the battery. The negative electrode sheet 3 has a simple overall structure, good corrosion resistance, strong electrical conductivity, high safety, and easy assembly.

[0068] In one embodiment, a battery is also provided, which includes the battery assembly as described above.

[0069] Any combination of the technical features in the above-described embodiments can be made, and for the sake of brevity, not all possible combinations are described, however, as long as there is no conflict, any combination of the technical features should be considered within the scope of the present disclosure.

[0070] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the application. It should be pointed out that for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, 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 assembly, comprising: The application relates to a battery assembly. The battery assembly comprises: a positive plate (1) provided with a protruding lead-out part (10) on one side; an insulating part (2) arranged above the positive plate (1), wherein a protruding part (20) is arranged in the middle region of the insulating part (2) and is sleeved on the outer periphery of the lead-out part (10); and a negative plate (3) arranged above the insulating part (2), wherein a through hole (30) is arranged in the middle region of the negative plate (3); the negative plate (3), the insulating part (2) and the positive plate (1) are sequentially arranged in layers, and the protruding part (20) passes through the through hole (30). One end of the protruding part (20) extending into the through hole (30) is higher than the surface of the negative plate (3) away from the insulating part (2); and one end of the lead-out part (10) extending into the protruding part (20) is lower than the one end of the protruding part (20) extending into the through hole (30). The insulating part (2) comprises an insulating body (21) and a protruding part (20), the protruding part (20) is arranged on one side surface of the insulating body (21); the protruding part (20) comprises a channel (22) arranged in the middle region of the insulating body (21), and the channel (22) is sleeved on the outer periphery of the lead-out part (10). The protruding part (20) is a cylindrical structure formed by protruding outward from one side surface of the insulating body (21), and the channel (22) is a cylindrical channel (22) longitudinally penetrating the cylindrical structure and the insulating body (21).

2. The battery assembly of claim 1, wherein, The positive plate (1) comprises a positive body (11) and a lead-out part (10), and the lead-out part (10) is a circular boss formed by protruding outward from one side surface of the positive body (11).

3. The battery assembly of claim 1 or 2, wherein, The negative plate (3) comprises a negative body (31) and a through hole (30), and the through hole (30) is a circular through hole (30) longitudinally penetrating the middle region of the negative body (31).

4. The battery assembly of claim 3, wherein, The surface of the negative body (31) is provided with a nickel plating layer and a plurality of penetrating small holes (32).

5. The battery assembly of claim 4, wherein, The negative body (31), the insulating body (21) and the positive body (11) are all circular ring structures, the diameter of the negative body (31) is greater than the diameters of the insulating body (21) and the positive body (11), and the diameter of the insulating body (21) is greater than the diameter of the positive body (11).

6. The battery assembly of claim 4, wherein, The insulating part (2) comprises a first melting point layer (33), a second melting point layer (34) and a third melting point layer arranged in layers, and the melting point of the second melting point layer (34) is higher than the melting points of the first melting point layer (33) and the second melting point layer (34).

7. The battery assembly of claim 6, wherein, The application further relates to a battery assembly comprising any one of the battery assemblies according to claims 1-9.

8. The battery assembly of claim 6, wherein, ​ 9. The battery assembly of claim 1 or 2, wherein, ​ 10. A battery, characterized by ​

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