Battery cell and battery
By increasing the Z-axis space in the internal space design of the battery, adopting a shell structure that combines aluminum plate and CPP insulation layer, and using solvent-free polyurethane adhesive, the sealing ring and encapsulation are eliminated, solving the problems of many battery assembly parts and complicated steps, and achieving increased battery capacity and reduced cost.
Patent Information
- Application Number
- CN202520229263.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-13
- Publication Date
- 2026-02-17
- Estimated Expiration
- 2035-02-13
AI Technical Summary
Existing batteries have a large number of cells or assembly parts, complicated assembly steps, and high market demand, resulting in high production costs and limited room for increasing battery capacity.
By increasing the internal space of the battery in the Z-axis direction, adopting a shell design that combines aluminum plates and CPP insulation layers using a dry process, and combining solvent-free polyurethane adhesives, the sealing ring and encapsulation are eliminated, simplifying the production process, and using laser welding connections for nuts and studs.
It increases battery capacity, reduces production costs, simplifies assembly steps, and improves the Z-axis space utilization and sealing effect of the battery.
Smart Images
Figure CN223927519U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a battery and its manufacturing technical field, concretely relates to a battery cell and battery. BACKGROUND
[0002] At present, domestic electric vehicles develop rapidly, and the problem of mileage improvement is a big problem, how to improve the capacity of the battery in a certain space is the direction that every company is striving for. Through innovative design, the volume or internal space of the battery can be increased to improve the battery capacity. In addition, in the prior art, the assembly of the battery cell or the battery has a large number of internal parts, the assembly steps are complicated, and the market demand for the number of batteries is large. If the number of assembly parts of the battery cell or the battery can be reduced or the assembly steps can be optimized, the production cost can be reduced and economic benefits can be brought. SUMMARY
[0003] In view of the technical problems of how to improve the battery capacity and how to reduce the production cost in the prior art, the utility model provides a battery cell and battery, the internal space in the Z direction space is improved, so that the same battery cell volume can load more capacity, while reducing the cost and reducing the BOM number (bill of materials (Bill of Materials, BOM for short)).
[0004] The utility model provides a kind of battery cell, including shell, shell includes aluminum plate, with the first CPP insulating layer of dry method bonding combination of aluminum plate, adhesive layer is provided between the first CPP insulating layer and aluminum plate, battery cell further includes nut and stud corresponding cooperation connection, part of stud projects from shell and is connected with nut by screw thread, another part of stud is connected and set in shell, the lower side of nut is dry method bonding combination with second CPP insulating layer, the first CPP insulating layer is sealed connection with second CPP insulating layer, the part of stud in shell is towards the side between nut and shell and is provided with insulating sheet.
[0005] Further, the first CPP insulating layer and the second CPP insulating layer are sealed hot melt connection.
[0006] Further, the adhesive layer is solventless polyurethane adhesive or benzene-free polyurethane adhesive.
[0007] Further, the shell is made by stretching after the first CPP insulating layer and the aluminum plate are dry combined, when the shell height is greater than 80mm, the initial thickness of the first CPP insulating layer is greater than 0.15mm; when the shell height is greater than 120mm, the initial thickness of the first CPP insulating layer is greater than 0.2mm.
[0008] Further, the nut and the top of the stud are laser welded.
[0009] The utility model also provides a battery, which includes the above-mentioned battery cell.
[0010] The shell is made by stretching after combining the CPP insulating layer and the aluminum plate by dry method, the aluminum plate and the CPP are directly bonded by adhesive and then are pressed to form, the internal space in the Z direction space is improved, so that the same battery volume can load more capacity and the Z direction height is improved.
[0011] The first CPP insulating layer and the second CPP insulating layer are heat sealingly connected, and the sealing effect of the battery is achieved, since the first CPP insulating layer is covered outside the shell, the sealing ring between the negative stud and the shell and the outer coating can be cancelled, the battery production process is simplified, the BOM quantity is reduced, and the cost is reduced,
[0012] The adhesive layer adopts solvent-free polyurethane adhesive or benzene-free polyurethane adhesive (such as alcohol-soluble or water-based), has good electrolyte resistance, high temperature resistance and aging resistance, and good bonding performance. The adhesive layer has electrolyte resistance, the adhesive layer is made of electrolyte corrosion resistant material, and the electrolyte corrosion in the battery packaging process is prevented. BRIEF DESCRIPTION OF DRAWINGS
[0013] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced as follows, and obviously, other drawings can be obtained by those skilled in the art without creative labor on the premise of not paying creative labor.
[0014] Figure 1 The structure schematic view of an embodiment of the present application is shown in the figure.
[0015] Figure 2 The structure schematic view of an embodiment of the shell is shown in the figure.
[0016] Explanation of main reference signs:
[0017] 1-shell, 11-first CPP insulating layer, 12-aluminum plate, 13-adhesive layer, 21-nut, 22-second CPP insulating layer, 3-stud, 4-insulating sheet. DETAILED DESCRIPTION
[0018] In order to make the technical scheme in the present application better understood by those skilled in the art, the technical scheme in the present application will be described clearly and completely below in conjunction with the drawings of the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the protection scope of the present application.
[0019] As shown in Figure 1 An embodiment of the present application provides an electric core, which comprises a shell 1, the shell 1 comprises an aluminum plate 12, a first CPP insulation layer 11 combined with the aluminum plate 12 by dry bonding, the shell 1 is made by stretching after the dry combination of the first CPP insulation layer 11 and the aluminum plate 12, when the height of the shell 1 is greater than 80mm, the initial thickness of the first CPP insulation layer 11 is greater than 0.15mm; when the height of the shell 1 is greater than 120mm, the initial thickness of the first CPP insulation layer 11 is greater than 0.2mm. The cast polypropylene film (CPP) is a polypropylene film produced by a casting process.
[0020] In a preferred embodiment, when the height of the shell 1 is 80mm, the initial thickness of the first CPP insulation layer 11 is 0.15mm, and the shell 1 is made by stretching after the dry combination of the first CPP insulation layer 11 and the aluminum plate 12; in a preferred embodiment, when the height of the shell 1 is 120mm, the initial thickness of the first CPP insulation layer 11 is 0.2mm, and the shell 1 is made by stretching after the dry combination of the first CPP insulation layer 11 and the aluminum plate 12.
[0021] As shown in Figure 2 The first CPP insulation layer 11 and the aluminum plate 12 are provided with an adhesive layer 13 therebetween, the adhesive layer 13 can adopt a solvent-free polyurethane adhesive or a benzene-free polyurethane adhesive (such as alcohol-soluble or water-based), which has good electrolyte resistance, high-temperature resistance, aging resistance and good bonding performance. The adhesive layer 13 has electrolyte resistance, and the adhesive layer 13 adopts a material resistant to electrolyte corrosion, so as to ensure that the shell 1 will not be eroded by electrolyte in the battery packaging process.
[0022] The electric core further comprises a nut 21 and a stud corresponding to the matched connection, a part of the stud is out of the shell 1 and is screwed with the nut 21, another part of the stud is clamped in the shell 1, the lower side of the nut 21 is bonded with a second CPP insulation layer 22, the first CPP insulation layer 11 is heat fusion sealed with the second CPP insulation layer 22, after the negative nut 21 is combined with the CPP film, the second CPP insulation layer 22 of the nut 21 is heat fusion connected with the first CPP insulation layer 11 of the aluminum shell, and the sealing effect of the battery is achieved. The part of the stud in the shell 1 is provided with an insulating sheet 4 between the side of the nut 21 and the shell 1. Since the shell 1 is covered with the second CPP insulation layer 22, the sealing ring between the negative stud and the shell 1 and the outer coating can be cancelled, the production process of the electric core is simplified, the BOM quantity is reduced, the cost is reduced, and the internal space in the Z direction space is improved, so that the same electric core volume can load more capacity and the Z direction height is improved. The negative nut 21 and the stud top are laser welded, and the connection strength is enhanced.
[0023] One embodiment of the utility model further provides a battery, which comprises the electric core in the above embodiment.
[0024] Although the utility model has been described in detail with reference to the drawings and in combination with the preferred embodiments, the utility model is not limited thereto. Those skilled in the art can make various equivalent modifications or replacements to the embodiments of the utility model without departing from the spirit and essence of the utility model, and these modifications or replacements should be within the scope of the utility model. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the utility model, and these changes or replacements should be within the protection scope of the utility model.
Claims
1. An electric cell, characterized by, The electric core comprises a shell, the shell comprises an aluminum plate, a first CPP insulation layer bonded with the aluminum plate by dry bonding, and an adhesive layer arranged between the first CPP insulation layer and the aluminum plate, and the electric core further comprises a nut and a stud correspondingly connected, a part of the stud extends out of the shell and is threadedly connected with the nut, another part of the stud is clamped and arranged in the shell, the lower side of the nut is bonded with a second CPP insulation layer by dry bonding, the first CPP insulation layer and the second CPP insulation layer are sealingly connected, and an insulating sheet is arranged between the part of the stud in the shell and the side of the shell facing the nut.
2. An electric cell as claimed in claim 1, characterized in that The first CPP insulation layer and the second CPP insulation layer are sealingly and hot-fusively connected.
3. An electric cell as claimed in claim 1, characterized in that The adhesive layer is a solvent-free polyurethane adhesive or a benzene-free polyurethane adhesive.
4. An electric cell as claimed in claim 1, characterized in that The shell is made by stretching after the first CPP insulation layer is dry-bonded with the aluminum plate, and when the height of the shell is greater than 80 mm, the initial thickness of the first CPP insulation layer is greater than 0.15 mm; and when the height of the shell is greater than 120 mm, the initial thickness of the first CPP insulation layer is greater than 0.2 mm.
5. An electrical cell as claimed in claim 1, wherein the cathode comprises a mixture of lithium cobalt oxide and lithium nickel oxide. The nut and the top of the stud are connected by laser welding.
6. A battery, characterized by The electric core comprises the electric core according to any one of claims 1-5.