Battery top cover structure, battery and electric equipment
By setting up a channel in the battery cover structure and connecting the installation gap, the gas leakage problem caused by unstable sealing is solved, the structural stability and safety of lithium batteries are improved, and the accuracy of helium inspection is improved.
Patent Information
- Application Number
- CN202420160423.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-23
- Publication Date
- 2024-12-24
- Estimated Expiration
- 2034-01-23
AI Technical Summary
After welding of sealed aluminum nails, existing square lithium batteries have poor sealing and lead to gas leakage, affecting safety and detection accuracy.
A battery ceiling structure is designed, including a cover plate, a sealed inner body and a sealed outer body. The liquid injection hole penetrates the cover plate, an installation gap is provided between the sealed inner body and the outer body, and a channel and the inner side of the cover plate are provided in the inner body. In communication, the coating of the dissolved layer makes the channel and the gap communicate when the electrolyte is in contact, and improves the gas emission efficiency.
It effectively avoids gas leakage errors, improves structural stability and safety, and enhances the accuracy of helium inspection.
Smart Images
Figure CN222233733U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of batteries, and in particular relates to a battery top cover structure, a battery and electrical equipment. Background Art
[0002] With the development of the new energy industry, the application of lithium-ion batteries has been continuously expanded and widely used in 3C digital products, electric vehicles, energy storage and other fields. Among them, square lithium batteries have become one of the mainstream lithium battery products due to their superior performance and high manufacturing efficiency. Square aluminum shell batteries are composed of positive electrode sheets, negative electrode sheets, isolation membranes, electrolytes, aluminum shells, top covers, etc. In the production process of square aluminum shell batteries, the electrolyte is added to the battery cell through the injection hole on the top cover in a dry environment. After the injection is completed, a sealing nail is used to seal the injection hole so that the inside of the battery cell is completely isolated from the external environment.
[0003] However, in the prior art, after the sealing aluminum nail is welded, the sealing nail fits tightly against the liquid injection port, resulting in a loose weld at the welding point of the sealing aluminum nail; and since the helium inside the battery cell cannot be released through the sealing nail, the gas leakage is within the specification range but the actual result has an error, thus affecting the safety of use and the accuracy of detection. Utility Model Content
[0004] The purpose of the utility model is to provide a battery top cover structure to improve the structural stability and the safety of use in view of the deficiencies in the prior art.
[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0006] A battery top cover structure comprises a cover plate, a sealed inner body and a sealed outer body; a liquid injection hole is provided on the cover plate, and the liquid injection hole is arranged to penetrate the thickness direction of the cover plate; the sealed outer body is connected to the outer opening of the liquid injection hole; the sealed inner body is connected to the inner opening of the liquid injection hole; and an installation gap is provided between the sealed inner body and the sealed outer body; a channel is provided in the sealed inner body, one end of the channel is connected to the installation gap; and the other end of the channel can be connected to the inner side of the cover plate.
[0007] Preferably: the sealing inner body comprises a sealing pin and a coating dissolving layer; the sealing pin is connected to the inner opening of the injection hole; and the channel is arranged in the thickness direction of penetrating the sealing pin; the coating dissolving layer is connected to the inside of the channel;
[0008] When the coating dissolution layer is in contact with the electrolyte, the channel is communicated with the installation gap and the inner side of the cover plate respectively.
[0009] Preferably, the coating dissolving layer is one of polymethyl methacrylate, bisphenol A epoxy resin and petroleum resin.
[0010] Preferably: the sealing nail is a sealing glue nail.
[0011] Preferably: the coating dissolving layer is connected to the bottom of the sealing pin and covers the inner opening of the channel; or the coating dissolving layer is connected to the top of the sealing pin and covers the outer opening of the channel.
[0012] Preferably, the coating dissolution layer is connected to the inner wall of the channel.
[0013] Preferably, the sealing outer body is a sealing metal part.
[0014] Preferably: the outer side surface of the sealed outer body is provided with a first groove; and / or, the inner side surface of the sealed outer body is provided with a second groove; and / or, the side end of the sealed outer body is provided with an assembly slope, and the assembly slope is connected to the inner wall of the injection hole.
[0015] The utility model also discloses a battery, comprising the battery top cover structure.
[0016] The utility model also discloses an electric device, comprising the battery.
[0017] The beneficial effect of the utility model lies in that the technical solution adopts channels to communicate with the installation gap and the inner side of the cover plate respectively, so that the gas inside the battery cell inside the cover plate can be effectively discharged through the channels, thereby improving the discharge flow efficiency and avoiding the phenomenon that the gas leakage is within the specification range but the actual result has errors; thereby improving the structural stability and improving the safety of use. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The following will refer to the attached Figures 1 to 5 To describe the features, advantages and technical effects of exemplary embodiments of the present utility model.
[0019] Figure 1 This is a schematic structural diagram of a battery top cover structure according to an embodiment of the utility model;
[0020] Figure 2 This is a schematic structural diagram of a sealed inner body of a battery top cover structure according to one embodiment of the utility model;
[0021] Figure 3 This is a schematic structural diagram of a sealed inner body of a battery top cover structure according to another embodiment of the utility model;
[0022] Figure 4 This is a structural schematic diagram of a sealed inner body of a battery top cover structure according to another embodiment of the utility model;
[0023] Figure 5 The figure is a schematic structural diagram of a sealed outer body of a battery top cover structure according to an embodiment of the present utility model.
[0024] In the figure: 1-cover plate; 11-liquid injection hole; 12-installation gap; 2-sealed inner body; 201-channel; 21-sealing pin; 214-guide slope; 22-coating dissolving layer; 3-sealed outer body; 31-first groove; 32-second groove; 33-assembly slope. DETAILED DESCRIPTION
[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.
[0026] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.
[0027] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.
[0028] In the description of the embodiments of the present application, the term "and / or" is merely an association relationship between the battery top cover structure, the battery, and the electrical equipment to describe the associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist at the same time, and multiple situations exist alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are an "or" relationship between the battery top cover structure, the battery, and the electrical equipment.
[0029] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).
[0030] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.
[0031] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.
[0032] The following is combined with Figure 1 to Figure 5 The utility model is further described in detail, but it is not intended to limit the utility model.
[0033] like Figure 1 As shown, in one embodiment of the utility model, the battery top cover structure comprises a cover plate 1, a sealed inner body 2 and a sealed outer body 3; a liquid injection hole 11 is provided on the cover plate 1, and the liquid injection hole 11 is arranged in the thickness direction of the cover plate 1; the sealed outer body 3 is connected to the outer opening of the liquid injection hole 11; the sealed inner body 2 is connected to the inner opening of the liquid injection hole 11; and an installation gap 12 is provided between the sealed inner body 2 and the sealed outer body 3; a channel 201 is provided in the sealed inner body 2, one end of the channel 201 is connected to the installation gap 12; the other end of the channel 201 can be connected to the inner side of the cover plate 1.
[0034] The technical solution of the utility model adopts channels that are respectively connected to the installation gap and the inner side of the cover plate, so that the gas (nitrogen, etc.) inside the battery cell inside the cover plate can be effectively discharged through the channels, thereby improving the discharge flow efficiency and avoiding the phenomenon that the gas leakage is within the specification range but the actual result has errors; thereby improving the structural stability and improving the safety of use.
[0035] The outer opening is the opening at one end of the liquid injection hole 11 communicating with the outside of the cover plate 1 ; the inner opening is the opening at one end of the battery cell installation cavity inside the cover plate 1 communicating with the liquid injection hole 11 .
[0036] Specifically, in some embodiments, Figure 1 As shown, the sealed inner body 2 includes a sealing nail 21 and a coating dissolving layer 22; the sealing nail 21 is connected to the inner opening of the injection hole 11; and the channel 201 is arranged in the thickness direction of the sealing nail 21; the coating dissolving layer 22 is connected to the inside of the channel 201; and when the coating dissolving layer 22 is in contact with the electrolyte within a preset time, the channel 201 is respectively connected to the installation gap 12 and the inner side of the cover plate 1. Among them, after the encapsulation of the sealed inner body 2 and the sealed outer body 3 is completed; the battery cell is inverted for a preset time, so that the coating dissolving layer 22 is dissolved in the solvent in the electrolyte, so that the inside of the battery cell and the installation gap 12 between the sealed inner body 2 and the sealed outer body 3 are interconnected, so that the accuracy of the helium detection of the battery cell after sealing can be improved. Among them, the preset time can be 4s, 20s, 1min, 5min, etc., and the preset time can be determined by the degree of dissolution of the coating dissolving layer 22 in the electrolyte during actual operation, and it is not limited here. In some embodiments, the coating dissolving layer 22 may be one of polymethyl methacrylate (PMMA), bisphenol A epoxy resin, petroleum resin C9, etc.; the speed of dissolving in the electrolyte may be increased by one of polymethyl methacrylate (PMMA), bisphenol A epoxy resin, petroleum resin C9, etc., thereby increasing the connection speed and further increasing the detection efficiency. The sealing nail 21 is a sealing nail; this structure may combine the sealing performance and elastic performance of the sealing nail to improve the rapidity of the installation of the sealing nail and improve the operation efficiency.
[0037] Specifically, in some embodiments, the coating dissolving layer 22 is connected to the bottom of the sealing pin 21 and covers the inner opening of the channel 201; or the coating dissolving layer 22 is connected to the top of the sealing pin 21 and covers the outer opening of the channel 201. In other words, the projection area of the coating dissolving layer 22 covers and is larger than the projection area of the through hole 201. Figure 2 As shown, the coating dissolving layer 22 is connected to the bottom of the sealing pin 21 and covers the inner opening of the channel 201. Figure 2 and 3As shown, the bottom of the sealing nail 21 is provided with a guiding slope 214; the coating dissolving layer 22 includes a horizontal portion 221 and an inclined portion 222 connected to the side end of the horizontal portion 221; and the horizontal portion 221 is connected to the bottom of the sealing nail 21 and covers the inner opening of the channel 201; the inclined portion 222 is connected to the guiding slope 214. The structure guides the sealing nail 21 to be quickly installed in the injection hole 11 through the guiding slope 214; and the stability of the coating dissolving layer 22 coated and installed on the sealing nail 21 is improved by the horizontal portion 221 and the inclined portion 222. Among them, (not shown in the figure) the coating dissolving layer 22 is connected to the top of the sealing nail 21 and covers the outer opening of the channel 201. The structure can realize that the electrolyte passes through the channel 201 and then contacts and dissolves with the coating dissolving layer 22, so as to realize that the inside of the battery cell is connected to the installation gap, and the accuracy of the helium detection of the battery cell after sealing can be improved.
[0038] Specifically, in some embodiments, the coating dissolving layer 22 is connected to the inner wall of the channel 201. That is, the projection area of the coating dissolving layer 22 covers and is equal to the projection area of the through hole 201. Figure 3 As shown, the coating dissolving layer 22 is connected to the inner wall of the inner opening of the channel 201. Figure 4 As shown, the coating dissolving layer 22 is connected to the inner wall of the outer opening of the channel 201. This structure allows the electrolyte to pass through the channel 201 and then contact and dissolve with the coating dissolving layer 22, thereby connecting the inside of the battery cell with the installation gap, and improving the accuracy of helium detection of the battery cell after sealing.
[0039] Specifically, in some embodiments, the sealing outer body 3 is a sealing metal part; further, the sealing metal part is a sealing aluminum nail; the sealing aluminum nail is connected to the inner wall of the injection hole 11 through the connecting member 4. Further, the connecting member 4 is a welding member. That is, the sealing aluminum nail is welded and arranged at the outer opening of the injection hole 11.
[0040] Specifically, in some embodiments, Figure 5 As shown, the outer side of the sealed outer body 3 is provided with a first groove 31; the inner side of the sealed outer body 3 is provided with a second groove 32; the side end of the sealed outer body 3 is provided with an assembly slope 33, and the assembly slope 33 is welded and connected to the inner wall of the injection hole 11 as a whole. This structure can improve the installation stability of the sealed outer body 3, and can effectively reduce the weight of the sealed outer body 3 through the first groove 31 and the second groove 32 while ensuring the hardness and sealing performance of the sealed outer body 3, thereby reducing the weight of the top cover structure.
[0041] Among them, as shown in the following table, in comparative example 1, the sizes of the common sealing nails used are H1: 3.0mm; H2: 1.5mm; W1: 3.2mm; W2: 2.0mm. After the common sealing nails are driven into the injection hole, the sealing aluminum nails are welded on the outside, the battery cell is placed upside down for 6 to 8 hours, and then the sealing aluminum nails are dug out with a tool, and the battery cell is subjected to a helium test, and the leakage rate is ≤5.0*10 -7 Pa.m 3 / s is judged as qualified. Example 1 uses the sealed inner body 2 designed by this patent (such as Figure 2 As shown), the dimensions are H1: 3.0mm; H2: 1.5mm; H3: 1.2mm; H4: 0.8mm; W1: 3.2mm; W2: 2.0mm; W3: 1.5mm; W4: 2.5mm; the width of the coating dissolving layer 22 is W5: 3.0mm; the coating dissolving layer 22 used is polymethyl methacrylate (PMMA), after the sealing nail of Example 1 is driven into the injection hole, the sealing aluminum nail is welded on the outside, the battery cell is placed upside down for 6 to 8 hours, and then the sealing aluminum nail is dug out with a tool, and the battery cell is subjected to a helium test, and the leakage rate is ≤5.0*10 -7 Pa.m 3 / s is judged as qualified. Example 2 uses the sealed inner body 2 designed by this patent (such as Figure 3 As shown), the dimensions are H1: 3.0mm; H2: 1.5mm; H5: 1.5mm; W1: 3.2mm; W2: 2.0mm; W3: 1.5mm; the coating dissolving layer 22 used is bisphenol A type epoxy resin. After the sealing glue nail of Example 1 is driven into the injection hole, the sealing aluminum nail is welded on the outside, the battery cell is placed upside down for 6 to 8 hours, and then the sealing aluminum nail is dug out with a tool, and the battery cell is subjected to helium detection test, and the leakage rate is ≤5.0*10 -7 Pa.m 3 / s is judged as qualified. Example 3 uses the sealed inner body 2 designed by this patent (such as Figure 4 As shown), the dimensions are H1: 3.0mm; H2: 1.5mm; H5: 1.8mm; W1: 3.2mm; W2: 2.0mm; W3: 1.5mm; the coating dissolving layer 22 used is petroleum resin C9, after the sealing nail of Example 1 is driven into the injection port, the sealing aluminum nail is welded on the outside, and then the sealing aluminum nail is dug out with a tool, and the battery core is subjected to helium detection test, and the leakage rate is ≤5.0*10 -7 Pa.m 3 / s is considered qualified. According to the experimental results, after using the sealant nail designed by this patent, the coating dissolution layer 22 partially dissolves, causing the inside of the battery cell to communicate with the cavity, making the result of the helium test air tightness test more accurate. It can effectively reduce the situation where the sealant nail fits tightly with the injection port, causing the helium test air tightness result to be misjudged, and improve the accuracy of the helium test.
[0042] Experimental groups Number of experiments Number of unqualified Comparative Example 1 10 5 Example 1 10 10 Example 2 10 10 Example 3 10 9
[0043] The utility model also proposes a battery, which includes a battery top cover structure. The specific structure of the battery top cover structure refers to the above-mentioned embodiment. Since the battery adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.
[0044] Among them, battery refers to a cup, trough or other container or part of a composite container that contains electrolyte solution and metal electrodes to generate current, and is a device that can convert chemical energy into electrical energy; the battery has positive and negative electrodes. With the advancement of science and technology, batteries generally refer to small devices that can generate electrical energy, such as solar cells. The performance parameters of batteries mainly include electromotive force, capacity, specific energy and resistance. Battery principle: In chemical batteries, the direct conversion of chemical energy into electrical energy is the result of spontaneous oxidation, reduction and other chemical reactions inside the battery, which are carried out on the two electrodes respectively. The negative electrode active material is composed of a reducing agent with a relatively negative potential and stable in the electrolyte, such as active metals such as zinc, cadmium, and lead, and hydrogen or hydrocarbons. The positive electrode active material is composed of an oxidizing agent with a relatively positive potential and stable in the electrolyte, such as metal oxides such as manganese dioxide, lead dioxide, and nickel oxide, oxygen or air, halogens and their salts, oxygen-containing acids and their salts, etc. The electrolyte is a material with good ionic conductivity, such as an aqueous solution of acid, alkali, or salt, an organic or inorganic non-aqueous solution, a molten salt, or a solid electrolyte.
[0045] The utility model also proposes an electrical device, which includes a battery. The specific structure of the battery refers to the above embodiment. Since the electrical device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.
[0046] Among them, the electrical equipment can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys and electric tools, etc. Vehicles can be fuel vehicles, gas vehicles or new energy vehicles, and new energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc.; spacecraft include airplanes, rockets, space shuttles and spacecrafts, etc.; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc. The embodiments of the present application do not impose special restrictions on the above-mentioned electrical equipment.
[0047] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode includes only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.
[0048] According to the disclosure and teaching of the above description, the technicians in the field of the utility model can also change and modify the above implementation. Therefore, the utility model is not limited to the above specific implementation, and any obvious improvement, replacement or modification made by the technicians in this field on the basis of the utility model belongs to the protection scope of the utility model. In addition, although some specific terms are used in this specification, these terms are only for the convenience of explanation and do not constitute any limitation to the utility model.
Claims
1. A battery top cover structure, characterized in that: It includes a cover plate, a sealed inner body and a sealed outer body; the cover plate is provided with an injection hole, and the injection hole is arranged to pass through the thickness direction of the cover plate; the sealed outer body is connected to the outer opening of the injection hole; the sealed inner body is connected to the inner opening of the injection hole; and an installation gap is arranged between the sealed inner body and the sealed outer body; a channel is arranged in the sealed inner body, one end of the channel is connected to the installation gap; the other end of the channel can be connected to the inner side of the cover plate; the sealed inner body includes a sealing nail and a coating dissolution layer; the sealing nail is connected to the inner opening of the injection hole; and the channel is arranged to pass through the thickness direction of the sealing nail; the coating dissolution layer is connected to the inside of the channel; when the coating dissolution layer is in contact with the electrolyte, the channel is respectively connected to the installation gap and the inner side of the cover plate.
2. The battery top cover structure according to claim 1, characterized in that: The coating dissolving layer is one of polymethyl methacrylate, bisphenol A type epoxy resin and petroleum resin.
3. The battery top cover structure according to claim 1 or 2, characterized in that: The sealing nail is a sealing glue nail.
4. The battery top cover structure according to claim 1, characterized in that: The coating dissolving layer is connected to the bottom of the sealing pin and covers the inner opening of the channel; Alternatively, the coating dissolving layer is connected to the top of the sealing pin and covers the outer opening of the channel.
5. The battery top cover structure according to claim 1, characterized in that: The coating dissolving layer is connected to the inner wall of the channel.
6. The battery top cover structure according to claim 1, characterized in that: The sealing outer body is a sealing metal part.
7. The battery top cover structure according to claim 1 or 6, characterized in that: The outer side surface of the sealing outer body is provided with a first groove; and / or, the inner side surface of the sealing outer body is provided with a second groove; and / or, the side end of the sealing outer body is provided with an assembly slope, and the assembly slope is connected to the inner wall of the injection hole.
8. A battery, characterized in that: The battery top cover structure comprises the battery top cover structure as described in any one of claims 1 to 7.
9. An electrical equipment, characterized in that: The battery comprising the above-mentioned claim 8.