A battery

Abstract

The application discloses a battery, and relates to the technical field of batteries; the battery comprises a shell, a battery cell and a cover plate, a containing cavity is formed in the shell, the battery cell is arranged in the containing cavity, the containing cavity is provided with a cavity opening, and the cover plate is covered on the cavity opening; an insulation structure is arranged between the cover plate and the shell and used for insulating and separating the cover plate and the shell; thus, the insulation structure is arranged between the cover plate and the shell, on one hand, insulation separation is formed between the cover plate and the shell; on the other hand, when the cover plate is covered on the cavity opening of the shell, the insulation structure reduces the friction possibility between the metal materials of the cover plate and the shell, thereby reducing the possibility that metal scraps and other impurities generated during covering fall into the shell and cause the battery short circuit, and improving the safety of the battery.

Description

Technical Field

[0001] This application belongs to the field of battery technology, and specifically relates to a battery. Background Technology

[0002] Lithium-ion batteries have attracted much attention from industries such as electric vehicles and 3C products due to their advantages such as high energy density, long cycle life and environmental friendliness.

[0003] In related technologies, lithium-ion batteries include a casing, a cell, and a cover plate. The cell is inserted into the casing through an opening, and the cover plate is used to seal the opening of the casing.

[0004] However, during the process of sealing the opening of the casing with the cover, the cover is prone to scraping against the casing, causing metal shavings and other impurities to fall into the casing and cause a short circuit in the battery, thus affecting the safety of the battery. Utility Model Content

[0005] This application aims to provide a battery that solves the problem that when a cover is sealed at the opening of the casing, the cover is prone to scraping against the casing, causing metal debris and other impurities to fall into the casing and cause a short circuit in the battery, thereby affecting the battery's safety.

[0006] To solve the above-mentioned technical problems, this application is implemented as follows:

[0007] In a first aspect, embodiments of this application propose a battery, comprising: a casing, a battery cell, and a cover plate; a receiving cavity is formed in the casing, the battery cell is disposed in the receiving cavity, the receiving cavity has an opening, and the cover plate seals the opening; an insulating structure is provided between the cover plate and the casing for insulating and isolating the cover plate and the casing.

[0008] Optionally, the insulating structure includes a first insulating portion disposed on the outer periphery of the cover plate, the first insulating portion being arranged circumferentially around the cover plate, and the first insulating portion being connected to the housing.

[0009] Optionally, the cover plate includes a cover plate body and a first insulating member. The cover plate body is disposed at the cavity opening, and the first insulating member is disposed around the outer periphery of the cover plate body to form the first insulating portion. One side of the first insulating member is connected to the cover plate body, and the other side of the first insulating member is connected to the housing.

[0010] Optionally, the cover plate body has a first connecting portion on the side facing the first insulating member, and the first insulating member has a second connecting portion on the side facing the cover plate body. The first connecting portion is at least partially embedded in the second connecting portion, or the second connecting portion is at least partially embedded in the first connecting portion.

[0011] And / or, the first insulating member has a limiting portion on the side facing the receiving cavity, the limiting portion at least partially abutting against the battery cell to limit the displacement of the battery cell.

[0012] Optionally, the cover plate has a connecting portion on its circumferential edge, and a first insulating layer is provided on the side of the cover plate facing the receiving cavity. The first insulating layer at least covers the surface of the connecting portion facing the housing to form the first insulating portion, and at least a portion of the connecting portion is connected to the housing through the first insulating portion.

[0013] Optionally, the insulating structure further includes a second insulating portion disposed at one end of the housing facing the cover plate, the second insulating portion surrounding the circumference of the cover plate, and the second insulating portion being connected to the cover plate.

[0014] Optionally, the housing includes a housing body and a second insulating element;

[0015] The receiving cavity is formed in the shell body, and the second insulating member is disposed at one end of the shell body near the cavity opening to form the second insulating part. One end of the second insulating member is connected to the shell body, and the other end of the second insulating member is connected to the cover plate.

[0016] Optionally, the second insulating member has a first limiting part at one end facing the shell body, and the shell body has a corresponding second limiting part at one end facing the first limiting part. The first limiting part and the second limiting part are connected in cooperation. One of the first limiting part and the second limiting part is a recessed structure, and the other is a protruding structure.

[0017] Optionally, the housing has an inner sidewall, the surface of which is provided with a second insulating layer, the second insulating layer covering at least one end of the inner sidewall near the cover plate to form a second insulating portion.

[0018] Optionally, the battery satisfies any one of the following conditions:

[0019] A. The second insulating layer has a first surface facing the receiving cavity and a second surface facing the cover plate, and the junction of the first surface and the second surface is provided with an arc transition surface;

[0020] B. The second insulating layer also has a third surface facing away from the cover plate, and the junction of the first surface and the third surface is provided with an arc transition surface;

[0021] C. A first groove is provided on the inner sidewall, and the second insulating layer is at least partially embedded in the first groove;

[0022] D. The second insulating layer has a second groove on the side facing the inner wall, and the inner wall has a protrusion, which is embedded in the second groove.

[0023] In the embodiments of this application, the battery includes a casing, a battery cell, and a cover plate. A receiving cavity is formed in the casing, and the battery cell is disposed in the receiving cavity. The receiving cavity has an opening, and the cover plate seals the opening. An insulating structure is provided between the cover plate and the casing to provide insulation between the cover plate and the casing. By providing an insulating structure between the cover plate and the casing, on the one hand, insulation can be formed between the cover plate and the casing; on the other hand, when the cover plate is sealed at the opening of the casing, the insulating structure reduces the possibility of friction between the metal materials of the cover plate and the casing, thereby reducing the possibility of metal debris or other impurities falling into the casing during sealing and causing a short circuit in the battery, thus improving the safety of the battery.

[0024] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0025] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0026] Figure 1 This is a schematic diagram of the battery structure according to an embodiment of this application;

[0027] Figure 2 This is a cross-sectional view of a first type of battery according to an embodiment of this application;

[0028] Figure 3 yes Figure 2 An enlarged view of part A, shown in the center circle;

[0029] Figure 4 This is a cross-sectional view of a second type of battery according to an embodiment of this application;

[0030] Figure 5 yes Figure 4 Enlarged view of section B shown in the center circle;

[0031] Figure 6 This is a cross-sectional view of a third type of battery according to an embodiment of this application;

[0032] Figure 7 yes Figure 6 Enlarged view of section C, shown in the center circle;

[0033] Figure 8 This is a schematic diagram of the structure of the second insulating layer according to the embodiments of this application;

[0034] Figure 9This is a partial structural schematic diagram of the second insulating layer according to an embodiment of this application.

[0035] Figure label:

[0036] 10: Shell; 11: Receiving cavity; 111: Cavity opening; 112: Inner wall; 113: First groove; 12: Shell body; 121: Second limiting part; 13: Second insulating element; 131: First limiting part; 14: First insulating layer; 20: Battery cell; 30: Cover plate; 31: Cover plate body; 311: First connecting part; 312: Connecting part; 32: First insulating element; 321: Second connecting part; 322: Limiting part; 40: Second insulating layer; 41: First surface; 42: Second surface; 43: Third surface; 44: Arc transition surface. Detailed Implementation

[0037] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0038] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0039] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0040] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0041] Before explaining the battery provided in the embodiments of this application, the application scenarios of the battery provided in the embodiments of this application will be specifically described:

[0042] With the development of battery technology, cylindrical batteries have been widely used in portable electronic devices such as mobile phones, digital cameras, and laptops. They also have broad application prospects in large and medium-sized electric vehicles such as electric cars and electric bicycles, as well as energy storage facilities, becoming an important technological means to solve global problems such as the energy crisis and environmental pollution. Among them, lithium-ion cylindrical batteries, as a new type of cylindrical battery, have advantages such as high energy density and power density, high operating voltage, light weight, small size, long cycle life, good safety, and environmental friendliness, and have broad application prospects in portable electrical appliances, power tools, large-scale energy storage, and electric vehicle power supplies.

[0043] In related technologies, lithium-ion cylindrical batteries include a casing, a cell, and a cover plate. The cover plate can seal the opening of the casing. Specifically, the cover plate and the casing are usually made of metal. During the process of sealing the opening of the casing, the cover plate is prone to rubbing against the casing, which can cause metal debris and other impurities to fall into the casing. This can easily cause a short circuit between the cell and the casing or between the positive and negative electrodes of the cell, thereby affecting the safety of the lithium-ion cylindrical battery.

[0044] Therefore, this application provides a battery. The battery provided in this application will be described in detail below with reference to the accompanying drawings and through specific embodiments and application scenarios.

[0045] like Figures 1 to 9 As shown, in some embodiments of this application, a battery is proposed including: a housing 10, a battery cell 20, and a cover plate 30; a receiving cavity 11 is formed in the housing 10, the battery cell 20 is disposed in the receiving cavity 11, the receiving cavity 11 has an opening 111, and the cover plate 30 is sealed at the opening 111; an insulating structure is provided between the cover plate 30 and the housing 10 to provide insulation between the cover plate 30 and the housing 10.

[0046] In this embodiment, by providing an insulating structure between the cover plate 30 and the housing 10, on the one hand, an insulating isolation can be formed between the cover plate 30 and the housing 10; on the other hand, when the cover plate 30 is sealed at the cavity 111 of the housing 10, the insulating structure reduces the possibility of friction between the metal materials of the cover plate 30 and the housing 10, thereby reducing the possibility of metal debris and other impurities falling into the housing 10 during sealing and causing a short circuit in the battery, thus improving the safety of the battery.

[0047] In practical applications, the casing 10 and the cover plate 30 are made of metal, such as aluminum alloy, steel, nickel-plated steel, titanium, etc. When the cover plate 30 covers the cavity 111 of the casing 10, friction can easily occur between the metal materials of the cover plate 30 and the casing 10, generating metal debris and other impurities. These metal debris and other impurities can fall into the receiving cavity 11 of the casing 10, which can easily cause a short circuit between the battery cell 20 and the casing 10, or between the positive and negative terminals of the battery cell 20, affecting the safety of the battery. Therefore, an insulating structure is provided between the casing 10 and the cover plate 30. The insulating structure can reduce the possibility of friction between the cover plate 30 and the casing 10, thereby reducing the probability of short circuit and improving the safety of the battery.

[0048] Specifically, the insulating structure may be provided with a first insulating part on the outer periphery of the cover plate 30, or a second insulating part may be provided at the cavity opening 111 of the receiving cavity 11 of the housing 10, or both the first insulating part and the second insulating part may exist; the first insulating part and the second insulating part may be insulating parts made of insulating material, or insulating adhesive layers; those skilled in the art may make the settings according to actual needs, and this application does not limit them.

[0049] It should be noted that the battery cell 20 is mainly formed by winding or stacking positive and negative electrode plates, and a separator is usually provided between the positive and negative electrode plates to separate them and prevent internal short circuits. The portions of the positive and negative electrode plates containing active material constitute the main body of the battery cell 20.

[0050] Understandably, the receiving cavity 11 formed by the casing 10 can accommodate the battery cell 20 and the electrolyte. The electrolyte is a solution containing free ions and is capable of conducting electricity. It plays a crucial role in the electrochemical reaction; the ions in the electrolyte can conduct charge, and at the same time, the electrolyte can ensure the stability of the electrochemical reaction. The electrolyte may include at least one of the following: acidic electrolytes, such as sulfuric acid; alkaline electrolytes, such as potassium hydroxide; and organic electrolytes, such as lithium salts dissolved in organic solvents. Those skilled in the art can configure the electrolyte according to actual needs, and this application does not impose any limitations on this.

[0051] In specific applications, such as Figure 1As shown, the cover plate 30 is provided with terminals (not shown in the figure), and the battery also includes a current collector (not shown in the figure). The current collector is located on the side of the cell 20 facing the cover plate 30, and the terminals are electrically connected to the positive electrode of the cell 20 through the current collector. The receiving cavity 11 also has a cavity bottom, and the battery also includes an explosion-proof valve located at the cavity bottom. The bottom of the housing 10 is electrically connected to the negative electrode of the cell 20, so that the terminals on the cover plate 30 form the positive electrode of the battery, and the housing 10 forms the negative electrode of the battery. In actual use, the terminals are provided with injection holes, through which electrolyte can be injected into the receiving cavity 11 so that the cell 20 can carry out electrochemical reactions.

[0052] It should be explained that the battery can be a cylindrical battery or a square battery, etc. Taking a cylindrical battery as an example, the casing 10 is cylindrical, and the cell 20 is formed by winding or by winding after stacking.

[0053] like Figure 1 As shown, in some embodiments of this application, the battery further includes an insulating film (not shown in the figure), which covers the outer periphery of the cell 20 to provide insulation between the cell 20 and the cavity wall of the receiving cavity 11 of the housing 10, thereby improving the insulation performance of the battery and improving the reliability and safety of the battery.

[0054] like Figures 2 to 5 As shown, in some embodiments of this application, the insulating structure includes a first insulating portion disposed on the outer periphery of the cover plate 30, the first insulating portion being arranged circumferentially around the cover plate 30, and the first insulating portion being connected to the housing 10.

[0055] In this embodiment, the first insulating part is arranged circumferentially around the cover plate 30, so that when the cover plate 30 covers the cavity 111 of the housing 10, the first insulating part can be connected to the cavity 111 of the housing 10, thereby insulating and isolating the cover plate 30 and the housing 10, and sealing it to reduce the possibility of electrolyte leakage; moreover, the first insulating part is directly connected to the housing 10, that is, the insulating material is in contact with the metal material or the insulating material, which reduces the probability of friction generating metal debris and other impurities, reduces the possibility of battery short circuit, and improves the safety and reliability of the battery.

[0056] In specific applications, the first insulating part can be an insulating component made of insulating material or an insulating adhesive layer. Those skilled in the art can make the setting according to actual needs, and this application does not limit it.

[0057] Understandably, the first insulating portion is arranged around the entire circumference of the cover plate 30, so that when the cover plate 30 is connected to the housing 10, the first insulating portion can form a seal over the entire circumference of the connection between the cover plate 30 and the housing 10.

[0058] It should be explained that the connection between the first insulating part and the housing 10 specifically refers to the thermal fusion connection or bonding between the first insulating part and the cavity opening 111 of the housing 10's receiving cavity 11. As long as it can achieve a tight connection between the insulating material and the metal material, or between the insulating materials, those skilled in the art can make the setting according to actual needs, and this application does not limit it.

[0059] Understandably, when bonding the first insulating part to the housing 10, corrosion-resistant adhesive is required to reduce the possibility that the adhesive will lose its stickiness after being corroded by the electrolyte, causing the connection to loosen.

[0060] like Figure 2 and Figure 3 As shown, in some embodiments of this application, the cover plate 30 includes a cover plate body 31 and a first insulating member 32. The cover plate body 31 is disposed at the cavity 111. The first insulating member 32 is disposed around the outer periphery of the cover plate body 31 to form a first insulating portion. One side of the first insulating member 32 is connected to the cover plate body 31, and the other side of the first insulating member 32 is connected to the housing 10.

[0061] In this embodiment, the first insulating member 32 is arranged around the outer periphery of the cover plate body 31 to form a first insulating portion. So when the cover plate 30 is connected to the housing 10, one side of the first insulating member 32 is connected to the cover plate body 31, and the other side of the first insulating member 32 is connected to the housing 10. Thus, the first insulating member 32 can form an insulating isolation between the housing 10 and the cover plate body 31. At the same time, the connection between the first insulating member 32 and the housing 10 forms a contact connection between the insulating material and the metal material or between the insulating materials. This can reduce the probability of metal debris and other impurities generated by friction during installation, reduce the possibility of battery short circuit, and improve the safety and reliability of the battery.

[0062] In specific applications, such as Figure 3 As shown, the first insulating member 32 is connected to the housing 10. Specifically, the first insulating member 32 can be connected to the cavity opening 111 of the receiving cavity 11 of the housing 10, which can be a heat-fusion connection, adhesive bonding, or pressure bonding. Similarly, one side of the first insulating member 32 is connected to the cover plate body 31, which can be a heat-fusion connection, adhesive bonding, or pressure bonding. Those skilled in the art can make the settings according to actual needs, and this application does not limit them.

[0063] It should be explained that the first insulating element 32 can be made of insulating materials such as polypropylene (PP), polyphenylene sulfide (PPS), polyimide (PI), polycarbonate (PC), perfluoroalkoxy resin (PFA), nonwoven fabric, or fiber, thereby insulating and isolating the cover plate body 31 from the housing 10. Those skilled in the art can set it according to actual needs, and this application does not limit it in this regard.

[0064] It should be noted that in practical applications, the first insulating component 32 and the cover plate body 31 can be integrally formed, for example, by injection molding; or they can be separately formed, for example, the first insulating component 32 and the cover plate body 31 can be processed independently and then connected together by snap-fit, adhesive, hot-melt connection or other methods; of course, there can also be other ways to connect the two together. Those skilled in the art can set it according to actual needs, and this application does not limit it.

[0065] Understandably, since the first insulating component 32 is made of insulating material, when the first insulating component 32 is installed and connected to the housing 10, no impurities such as metal shavings generated by friction between metals will be produced, thereby reducing the probability of battery short circuit.

[0066] Specifically, the cover plate body 31 is provided with a terminal post, which is insulated from the cover plate body 31. The terminal post is electrically connected to the positive terminal of the cell 20 through a current collector. On one side of the cover plate 30, the terminal post forms the positive terminal of the battery.

[0067] like Figure 2 and Figure 3 As shown, in some embodiments of this application, the cover plate body 31 is provided with a first connecting portion 311 on the side facing the first insulating member 32, and the first insulating member 32 is provided with a second connecting portion 321 on the side facing the cover plate body 31. The first connecting portion 311 is at least partially embedded in the second connecting portion 321, or the second connecting portion 321 is at least partially embedded in the first connecting portion 311.

[0068] In this embodiment, the first insulating member 32 and the cover plate body 31 are connected by the first connecting part 311 being at least partially embedded in the second connecting part 321, or the second connecting part 321 being at least partially embedded in the first connecting part 311. At the same time, it is convenient to disassemble and assemble, and it is convenient to replace the first insulating member 32 if it is damaged, without having to replace the cover plate body 31, thus reducing maintenance costs.

[0069] In specific applications, the first connecting part 311 and the second connecting part 321 are respectively a groove and a protrusion. The protrusion can be embedded in the groove to connect the first insulating member 32 and the cover plate body 31 together. It should be noted that the groove depth and the protrusion length of the protrusion need to ensure the reliability of the connection between the first insulating member 32 and the cover plate body 31.

[0070] Understandably, in practical applications, in addition to the snap-fit ​​connection between the cover plate body 31 and the first insulating member 32 through the first connecting part 311 and the second connecting part 321, heat fusion connection, bonding, etc. can be added to ensure the reliability of the connection. The specific connection method can be set by those skilled in the art according to actual needs, and this application does not limit it.

[0071] It should be explained that when the cover plate body 31 and the first insulating component 32 are injection molded as a single unit, the first connecting part 311 can be a protrusion, and the first insulating component 32 can cover the outer periphery of the protrusion, thereby connecting the two together and ensuring the tightness and reliability of the connection.

[0072] like Figure 3 As shown, in some embodiments of this application, the first insulating member 32 is provided with a limiting portion 322 on the side facing the receiving cavity 11. The limiting portion 322 at least partially abuts against the battery cell 20 to limit the displacement of the battery cell 20.

[0073] In this embodiment, the limiting part 322 at least partially abuts against the cell 20, thereby limiting the displacement of the cell 20. This ensures that the cell 20 will not shift when the battery is vibrated or impacted, reducing the possibility that the cell 20 may break from the connection with the terminal or other components due to displacement, thereby improving the reliability of the battery.

[0074] In specific applications, the limiting part 322 can be arranged around the entire circumference of the first insulating member 32, or it can be arranged partially around the circumference of the first insulating member 32 to form an "interval" abutment structure. Of course, it can also be arranged radially along the receiving cavity 11, as long as it can abut against the battery cell 20 and avoid the connection between the battery cell 20 and the electrode post. Those skilled in the art can make the setting according to actual needs, and this application does not limit it.

[0075] like Figure 4 and Figure 5 As shown, in some embodiments of this application, the circumferential edge of the cover plate 30 is provided with a connecting portion 312, and the side of the cover plate 30 facing the receiving cavity 11 is provided with a first insulating layer 14. The first insulating layer 14 at least covers the side surface of the connecting portion 312 facing the housing 10 to form a first insulating portion, and at least a portion of the connecting portion 312 is connected to the housing 10 through the first insulating portion.

[0076] In this embodiment, the connecting portion 312 provided on the circumferential edge of the cover plate 30 can be connected to the housing 10 through the first insulating layer 14. While satisfying the requirements of insulation and sealing connection, the structure is simpler and the cost is lower.

[0077] In specific applications, the circumferential edge of the cover plate 30 is provided with a connecting portion 312, which is adapted to the housing 10. For example, as shown in the figure... Figure 5 As shown, the connecting part 312 is a "stepped structure" that snaps onto the housing 10. Of course, it can also be other structural forms that can be stably connected. Those skilled in the art can set it according to actual needs, and this application does not limit it.

[0078] Understandably, the cover plate 30 is provided with a first insulating layer 14 on the side facing the receiving cavity 11. The first insulating layer 14 covers at least the surface of the connecting part 312 facing the housing 10. It can be that the first insulating layer 14 only covers the surface of the connecting part 312 facing the housing 10; or it can cover the entire surface of the cover plate 30 facing the receiving cavity 11 on the basis of covering the surface of the connecting part 312 facing the housing 10. In this way, the first insulating layer 14 can not only form an insulating barrier between the housing 10 and the cover plate 30, but also form an insulating barrier between the cover plate 30 and the battery cell 20, thereby improving the safety of the battery. Of course, in practical applications, the first insulating layer 14 needs to avoid the connection position between the battery cell 20 and the terminal post.

[0079] It should be noted that by setting the first insulating layer 14, the original insulating component can be replaced, resulting in a simpler structure and lower cost.

[0080] It should be noted that the first insulating layer 14 can be made of insulating materials such as polypropylene (PP), polyphenylene sulfide (PPS), polyimide (PI), polycarbonate (PC), perfluoroalkoxy resin (PFA), nonwoven fabric, and fibers. Those skilled in the art can make the settings according to actual needs, and this application does not limit it.

[0081] Specifically, the connecting part 312 is connected to the housing 10 through the first insulating layer 14. Specifically, the first insulating layer 14 can be bonded to the connecting part 312 and the housing 10 or heat-fused together. For example, the first insulating layer 14 is an insulating adhesive, and the connecting part 312 and the housing 10 are bonded together by the insulating adhesive. Of course, the first insulating layer 14 can also only serve the function of insulation, isolation and sealing, and the connecting part 312 and the housing 10 can be welded together on the outer periphery. This does not affect the insulation, isolation and sealing between the connecting part 312 and the housing 10 provided by the first insulating layer 14. Those skilled in the art can make the settings according to actual needs, and this application does not limit them.

[0082] like Figure 2 , Figure 3 , Figures 6 to 9 As shown, in some embodiments of this application, the insulating structure further includes a second insulating portion disposed at one end of the housing 10 facing the cover plate 30, the second insulating portion surrounding the cover plate 30 in the circumferential direction, and the second insulating portion being connected to the cover plate 30.

[0083] In this embodiment, the second insulating part is disposed at the end of the housing 10 facing the cover plate 30 and is disposed around the circumference of the cover plate 30. So when the cover plate 30 covers the cavity 111 of the housing 10, the second insulating part can be connected to the cover plate 30, thereby insulating and isolating the cover plate 30 and the housing 10, and sealing it to reduce the possibility of electrolyte leakage. Moreover, the second insulating part is directly connected to the cover plate 30, that is, the insulating material is in contact with the metal material or the insulating material, which reduces the probability of friction generating metal debris and other impurities, reduces the possibility of battery short circuit, and improves the safety and reliability of the battery.

[0084] In specific applications, the second insulating part can be an insulating component made of insulating material or an insulating adhesive layer. Those skilled in the art can make the setting according to actual needs, and this application does not limit it.

[0085] Understandably, the second insulating portion is arranged around the entire circumference of the cover plate 30, so that when the cover plate 30 is connected to the housing 10, the second insulating portion can form a seal over the entire circumference of the connection between the cover plate 30 and the housing 10.

[0086] It should be explained that the connection between the second insulating part and the cover plate 30 specifically refers to the thermal fusion connection or bonding between the second insulating part and the cover plate 30, which can achieve a tight connection between the insulating material and the metal material, or between the insulating materials. Those skilled in the art can make the setting according to actual needs, and this application does not limit it.

[0087] Understandably, when bonding the second insulating part to the cover plate 30, corrosion-resistant adhesive is required to reduce the possibility that the adhesive will lose its stickiness after being corroded by the electrolyte, causing the connection to loosen.

[0088] It should be noted that the second insulating part and the housing 10 can be connected by snap-fit, adhesive, hot melt connection, injection molding, etc. Those skilled in the art can make the settings according to actual needs, and this application does not limit them.

[0089] like Figure 3 As shown, in some embodiments of this application, the housing 10 includes a housing body 12 and a second insulating member 13; a receiving cavity 11 is formed in the housing body 12, and the second insulating member 13 is disposed at one end of the housing body 12 near the cavity opening 111 to form a second insulating portion, one end of the second insulating member 13 is connected to the housing body 12, and the other end of the second insulating member 13 is connected to the cover plate 30.

[0090] In this embodiment, one end of the second insulating member 13 is connected to the shell body 12 and the other end is connected to the cover plate 30, so that the second insulating member 13 can form an insulating isolation between the shell body 12 and the cover plate 30; at the same time, the connection between the second insulating member 13 and the cover plate 30 forms a contact connection between the insulating material and the metal material or between the insulating materials, which can reduce the probability of metal debris and other impurities generated by friction during installation, reduce the possibility of battery short circuit, and improve the safety and reliability of the battery.

[0091] In specific applications, such as Figure 3 As shown, the second insulating member 13 is connected to the cover plate 30, which can be a heat-fusion connection, adhesive bonding, or press-fit connection, etc. Similarly, the second insulating member 13 is connected to the shell body 12, which can be a heat-fusion connection, adhesive bonding, or press-fit connection, etc. Those skilled in the art can make the settings according to actual needs, and this application does not limit them.

[0092] It should be explained that the second insulating element 13 can be made of insulating materials such as polypropylene (PP), polyphenylene sulfide (PPS), polyimide (PI), polycarbonate (PC), perfluoroalkoxy resin (PFA), nonwoven fabric, or fiber, thereby insulating and isolating the cover plate 30 from the shell body 12. Those skilled in the art can set it according to actual needs, and this application does not limit it.

[0093] It should be noted that in practical applications, the second insulating component 13 and the shell body 12 can be integrally formed, for example, by injection molding; or they can be separately formed, for example, the second insulating component 13 and the shell body 12 are processed independently and then connected together by snap-fit, adhesive, hot-melt connection or other methods; of course, there can be other ways to connect the two together. Those skilled in the art can set it according to actual needs, and this application does not limit it.

[0094] Understandably, since the second insulating element 13 is made of insulating material, when the second insulating element 13 is installed and connected to the cover plate 30, no metal debris or other impurities generated by friction between metals will be produced, thereby reducing the probability of battery short circuit.

[0095] Understandably, in practical applications, the connection can be achieved through heat fusion or bonding between the first insulating component 32 and the second insulating component 13, or through heat fusion or bonding between the first insulating component 32 and the housing 10, or through heat fusion or bonding between the second insulating component 13 and the cover plate 30, thereby enabling the cover plate 30 to seal the cavity 111 of the housing 10 to achieve a sealed connection. Those skilled in the art can make the settings according to actual needs, and this application does not limit this.

[0096] like Figure 3 As shown, in some embodiments of this application, the second insulating member 13 is provided with a first limiting part 131 at one end facing the shell body 12, and the shell body 12 is provided with a corresponding second limiting part 121 at one end facing the first limiting part 131. The first limiting part 131 and the second limiting part 121 are connected in cooperation. One of the first limiting part 131 and the second limiting part 121 is a recessed structure, and the other is a protruding structure.

[0097] In this embodiment of the application, the second insulating member 13 is connected to the shell body 12 by the cooperation of the first limiting part 131 and the second limiting part 121; at the same time, it is convenient to disassemble and assemble, and in the event of damage to the second insulating member 13, it is convenient to replace it without replacing the shell body 12, thus reducing maintenance costs.

[0098] In specific applications, the first limiting part 131 and the second limiting part 121 are respectively a groove and a protrusion. The protrusion can be embedded in the groove to connect the second insulating member 13 to the shell body 12. It should be noted that the groove depth and the protrusion length of the protrusion need to ensure the reliability of the connection between the second insulating member 13 and the shell body 12.

[0099] Understandably, in practical applications, in addition to the snap-fit ​​connection between the second insulating member 13 and the shell body 12 via the first limiting part 131 and the second limiting part 121, heat fusion connection, bonding, etc. can be added to ensure the reliability of the connection. The specific connection method can be set by those skilled in the art according to actual needs, and this application does not limit it.

[0100] It should be explained that when the second insulating member 13 and the shell body 12 are integrally injection molded, the second limiting part 121 can be a groove, and the first limiting part 131 of the second insulating member 13 can be embedded in the groove, thereby connecting the two together and ensuring the tightness and reliability of the connection.

[0101] like Figures 6 to 9 As shown, in some embodiments of this application, the housing 10 has an inner sidewall 112, and the surface of the inner sidewall 112 is provided with a second insulating layer 40. The second insulating layer 40 covers at least one end of the inner sidewall 112 near the cover plate 30 to form a second insulating portion.

[0102] In this embodiment, the second insulating layer 40 disposed on the surface of the inner sidewall 112 can at least cover one end of the inner sidewall 112 near the cover plate 30 to form a second insulating part. That is, the second insulating layer 40 can be connected to the cover plate 30 to achieve insulation isolation and sealing connection. Compared with the provision of insulating components, the structure of the second insulating layer 40 is simpler and the cost is lower.

[0103] In specific applications, the second insulating layer 40 can be made of insulating materials such as polypropylene (PP), polyphenylene sulfide (PPS), polyimide (PI), polycarbonate (PC), perfluoroalkoxy resin (PFA), nonwoven fabric, and fibers. Those skilled in the art can make the settings according to actual needs, and this application does not limit them.

[0104] Understandably, the second insulating layer 40 covers at least one end of the inner sidewall 112 near the cover plate 30. Alternatively, the second insulating layer 40 may only cover one end of the inner sidewall 112 near the cover plate 30, or it may cover the entire surface of the inner sidewall 112 while covering the end of the inner sidewall 112 near the cover plate 30. This allows the second insulating layer 40 to not only form an insulating barrier between the housing 10 and the cover plate 30, but also to form an insulating barrier between the housing 10 and the cell 20, thereby improving the safety of the battery.

[0105] It should be noted that the second insulating layer 40 can be made of insulating materials such as polypropylene (PP), polyphenylene sulfide (PPS), polyimide (PI), polycarbonate (PC), perfluoroalkoxy resin (PFA), nonwoven fabric, and fibers. Those skilled in the art can set it according to actual needs, and this application does not limit it in this regard.

[0106] Specifically, the second insulating layer 40 may exist simultaneously with the first insulating layer 14 or the first insulating element 32, or only the second insulating layer 40 may exist. In the former case, the second insulating layer 40 is thermally fused or bonded to the first insulating layer 14 or the first insulating element 32; in the latter case, the second insulating layer 40 is thermally fused or bonded to the cover plate 30. Those skilled in the art can make the configuration according to actual needs, and this application does not impose any restrictions on it.

[0107] It should be explained that, in practical applications, the second insulating layer 40 can be an insulating coating, or it can be an insulating component integrally formed with the housing 10 or separately formed to form a second insulating part at one end near the cover plate 30; those skilled in the art can make the setting according to actual needs, and this application does not limit it in this regard.

[0108] like Figures 7 to 9 As shown, in some embodiments of this application, the second insulating layer 40 has a first surface 41 facing the receiving cavity 11 and a second surface 42 facing the cover plate 30, and an arc transition surface 44 is provided at the junction of the first surface 41 and the second surface 42.

[0109] like Figures 7 to 9 As shown, in some embodiments of this application, the second insulating layer 40 also has a third surface 43 facing away from the cover plate 30, and an arc transition surface 44 is provided at the junction of the first surface 41 and the third surface 43.

[0110] like Figures 7 to 9 As shown, in some embodiments of this application, a first groove 113 is provided on the inner sidewall 112, and the second insulating layer 40 is at least partially embedded in the first groove 113.

[0111] like Figures 7 to 9 As shown, in some embodiments of this application, the second insulating layer 40 has a second groove on the side facing the inner sidewall 112, and the inner sidewall 112 has a protrusion, which is embedded in the second groove.

[0112] In this embodiment, the arc transition surface 44 formed between the first surface 41 and the second surface 42 and / or the third surface 43 can reduce the possibility of the sharp edges of the second insulating layer 40 piercing the battery cell 20; at the same time, the second insulating layer 40 is at least partially embedded in the first groove 113, or the protrusion provided on the inner sidewall 112 is embedded in the second groove of the second insulating layer 40, which can improve the connection reliability between the second insulating layer 40 and the inner sidewall 112, and can also form an installation positioning for the second insulating layer 40, improving the installation accuracy.

[0113] In specific applications, in addition to the interlocking of the protrusions and grooves, the second insulating layer 40 and the inner sidewall 112 can also be connected by heat fusion, adhesive bonding, etc., to improve the reliability of the connection. It should be noted that when using adhesive bonding, the adhesive should be corrosion resistant to reduce the possibility of the electrolyte corroding the adhesive and causing it to lose its adhesiveness.

[0114] It should be noted that the first groove 113 and the second groove can be arranged around the entire circumference of the receiving cavity 11, or they can be arranged discontinuously with "intervals". At the same time, the corresponding protrusions are also arranged accordingly. Those skilled in the art can make the arrangement according to the actual situation, and this application does not limit it.

[0115] Specifically, such as Figure 8 and Figure 9 As shown, the second insulating layer 40 is an insulating component or insulating adhesive layer made of insulating material. The second insulating layer 40 has a first surface 41, a second surface 42 and a third surface 43. An arc transition surface 44 is formed at the junction of the first surface 41 and the second surface 42, and an arc transition surface 44 is formed at the junction of the first surface 41 and the third surface 43, which can reduce the possibility of the sharp edges of the second insulating layer 40 piercing the battery cell 20.

[0116] Understandably, the first groove 113 and the second groove can be square grooves or circular grooves, or of course, other shapes of grooves. The protrusions are correspondingly set, and those skilled in the art can set them according to actual needs. This application does not limit them in this regard.

[0117] It should be explained that the overall thickness of the second insulating layer 40 is relatively small, thereby reducing the space occupied inside the cavity 11; at the same time, the groove depth of the first groove 113 is relatively shallow, thereby reducing the impact on the strength of the shell 10; similarly, the groove depth of the second groove is also relatively shallow, and the protrusion length of the protrusion is also relatively small, to avoid penetrating the second insulating layer 40 and occupying too much space inside the cavity 11.

[0118] Other components of the battery according to the embodiments of this application, such as explosion-proof valves and terminals, are known to those skilled in the art and will not be described in detail here.

[0119] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0120] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery, characterized in that, include: The casing (10), the battery cell (20), and the cover plate (30); The housing (10) has a receiving cavity (11) formed therein, the battery cell (20) is disposed in the receiving cavity (11), the receiving cavity (11) has an opening (111), and the cover plate (30) is sealed at the opening (111); an insulating structure is provided between the cover plate (30) and the housing (10) to provide insulation between the cover plate (30) and the housing (10).

2. The battery according to claim 1, characterized in that, The insulating structure includes a first insulating portion disposed on the outer periphery of the cover plate (30), the first insulating portion being arranged circumferentially around the cover plate (30), and the first insulating portion being connected to the housing (10).

3. The battery according to claim 2, characterized in that, The cover plate (30) includes a cover plate body (31) and a first insulating member (32). The cover plate body (31) is located at the cavity (111). The first insulating member (32) is arranged around the outer periphery of the cover plate body (31) to form the first insulating portion. One side of the first insulating member (32) is connected to the cover plate body (31), and the other side of the first insulating member (32) is connected to the housing (10).

4. The battery according to claim 3, characterized in that, The cover plate body (31) has a first connecting portion (311) on the side facing the first insulating member (32), and the first insulating member (32) has a second connecting portion (321) on the side facing the cover plate body (31). The first connecting portion (311) is at least partially embedded in the second connecting portion (321), or the second connecting portion (321) is at least partially embedded in the first connecting portion (311). And / or, the first insulating member (32) is provided with a limiting portion (322) on the side facing the receiving cavity (11), the limiting portion (322) at least partially abutting against the battery cell (20) to limit the displacement of the battery cell (20).

5. The battery according to claim 2, characterized in that, The cover plate (30) has a connecting portion (312) on its circumferential edge. The cover plate (30) has a first insulating layer (14) on the side facing the receiving cavity (11). The first insulating layer (14) covers at least the surface of the connecting portion (312) facing the housing (10) to form the first insulating portion. At least a portion of the connecting portion (312) is connected to the housing (10) through the first insulating portion.

6. The battery according to any one of claims 1-5, characterized in that, The insulation structure further includes a second insulation portion disposed at one end of the housing (10) facing the cover plate (30), the second insulation portion surrounding the circumference of the cover plate (30), and the second insulation portion being connected to the cover plate (30).

7. The battery according to claim 6, characterized in that, The housing (10) includes a housing body (12) and a second insulating component (13); The receiving cavity (11) is formed in the shell body (12), and the second insulating member (13) is disposed at one end of the shell body (12) near the cavity opening (111) to form the second insulating part. One end of the second insulating member (13) is connected to the shell body (12), and the other end of the second insulating member (13) is connected to the cover plate (30).

8. The battery according to claim 7, characterized in that, The second insulating member (13) is provided with a first limiting part (131) at one end facing the shell body (12), and the shell body (12) is provided with a second limiting part (121) at one end facing the first limiting part (131). The first limiting part (131) and the second limiting part (121) are connected in cooperation. One of the first limiting part (131) and the second limiting part (121) is a recessed structure, and the other is a protruding structure.

9. The battery according to claim 6, characterized in that, The housing (10) has an inner sidewall (112) with a second insulating layer (40) on its surface. The second insulating layer (40) covers at least one end of the inner sidewall (112) near the cover plate (30) to form the second insulating portion.

10. The battery according to claim 9, characterized in that, It satisfies any of the following conditions: A. The second insulating layer (40) has a first surface (41) facing the receiving cavity (11) and a second surface (42) facing the cover plate (30), and an arc transition surface (44) is provided at the junction of the first surface (41) and the second surface (42); B. The second insulating layer (40) also has a third surface (43) facing away from the cover plate (30), and an arc transition surface (44) is provided at the junction of the first surface (41) and the third surface (43); C. A first groove (113) is provided on the inner sidewall (112), and the second insulating layer (40) is at least partially embedded in the first groove (113); D. The second insulating layer (40) has a second groove on the side facing the inner sidewall (112), and the inner sidewall (112) has a protrusion, which is embedded in the second groove.

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