Single battery
By using adhesive tape components in the battery to increase the contact area between the negative electrode and the casing, heat is absorbed and the core is stabilized, solving the problem of cell displacement under high-frequency vibration and improving the battery's stability and cycle performance.
Patent Information
- Application Number
- CN202423026749.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-06
- Publication Date
- 2025-12-12
- Estimated Expiration
- 2034-12-06
AI Technical Summary
Existing cylindrical batteries with multiple tabs are prone to cell displacement under high-frequency vibration, which leads to the failure of the absorbent swelling tape, uneven electrolyte distribution, and affects the battery's cycle performance and lifespan.
An adhesive tape assembly is used to surround the core assembly. The adhesive tape assembly includes a first adhesive layer, an expansion layer, a thermally conductive layer, and a heat dissipation layer. It expands by energizing or absorbing heat to fill the gap between the core and the housing, increase the contact area between the negative electrode sheet and the housing, absorb heat, and stabilize the core.
It improves battery stability and cycle performance, reduces battery failure caused by vibration, enhances thermal management capabilities, and reduces internal resistance and safety risks.
Smart Images
Figure CN223665500U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to battery technology field especially relates to a single battery. BACKGROUND
[0002] In full tab cylindrical battery, the battery applied to electric tool in order to avoid the repeated displacement of electric core under high frequency vibration and the breakage of safety protection device leading to failure, usually adopts liquid absorption swelling adhesive tape to fill the gap between electric core and steel shell. The adhesive tape expands after absorbing electrolyte, which helps to stabilize the electric core and reduce displacement. However, the existing liquid absorption swelling adhesive tape has the problem of uneven distribution of electrolyte. Especially during the battery cycle, the expansion of the adhesive tape will squeeze the electrolyte, leading to liquid-rich in some areas and liquid-poor in some areas, affecting the cycle performance of the battery.
[0003] In addition, the swelling adhesive tape is prone to deformation after absorbing liquid, and the elastic modulus decreases, losing the binding effect on the roll core and failing to maintain the close fit of the pole piece. This failure may cause poor lithium insertion and lithium precipitation in the later stage of the battery cycle, thereby reducing the cycle life and performance of the battery. SUMMARY
[0004] One object of the utility model is to provide a single battery, which aims to solve the technical problem of simultaneously improving the stability and cycle performance of the single battery.
[0005] To achieve the above object, the utility model provides a scheme: a single battery, characterized by comprising: a shell;
[0006] A roll core assembly is arranged inside the shell, and the roll core assembly comprises a positive pole piece, a separator and a negative pole piece, with the separator arranged between the positive pole piece and the negative pole piece;
[0007] A glue paper assembly is arranged around the roll core assembly, with one side of the glue paper assembly electrically connected to the negative pole piece and the other side electrically connected to the shell, and the glue paper assembly is used to swell after being powered or absorbing heat.
[0008] Optionally, the glue paper assembly comprises a first adhesive layer and a swelling layer, the first adhesive layer is arranged on the side of the swelling layer close to the negative pole piece, the first adhesive layer is electrically connected to the negative pole piece, and the swelling layer is electrically connected to the shell.
[0009] Optionally, the glue paper assembly comprises a heat-conducting layer, the heat-conducting layer is arranged between the first adhesive layer and the swelling layer, one side of the heat-conducting layer is connected to the first adhesive layer, and the other side is connected to the swelling layer.
[0010] Optionally, the thickness of the swelling layer is L1, the thickness of the heat-conducting layer is L2, and 1≤L2 / L1≤5.
[0011] Optionally, 5um≤L1≤10um, 5um≤L2≤15um.
[0012] Optionally, the adhesive paper assembly comprises a heat dissipation layer, the heat dissipation layer is arranged on the side of the expansion layer close to the shell, and the expansion layer is connected to the shell through the heat dissipation layer.
[0013] Optionally, the thickness of the expansion layer is L1, the thickness of the heat dissipation layer is L3, and 1≤L3 / L1≤4.
[0014] Optionally, 4um≤L1≤10um, 4um≤L3≤12um.
[0015] Optionally, the adhesive paper assembly further comprises a heat conduction layer, the heat conduction layer is arranged between the first adhesive layer and the expansion layer, one side of the heat conduction layer is connected to the first adhesive layer, and the other side of the heat conduction layer is connected to the expansion layer.
[0016] Optionally, the thickness of the adhesive paper assembly is L4, and 15um≤L4≤30um.
[0017] Optionally, the adhesive paper assembly comprises a second adhesive layer, the second adhesive layer is arranged around the expansion layer, and the expansion layer is connected to the shell through the second adhesive layer.
[0018] Optionally, the expansion layer comprises a base body and a protruding portion, the base body is connected to the first adhesive layer, and the protruding portion is arranged at both ends of the base body in the height direction of the winding core assembly and abuts against the shell.
[0019] The single battery has the advantages that:
[0020] The single battery comprises a shell, a winding core assembly and an adhesive paper assembly, the winding core assembly is arranged in the shell, the winding core assembly comprises a positive plate, a diaphragm and a negative plate, and the diaphragm is arranged between the positive plate and the negative plate.
[0021] Through the connection of the adhesive paper assembly and the shell, the contact area of the negative plate and the shell is significantly increased, so that the internal resistance of the single battery is effectively reduced. BRIEF DESCRIPTION OF DRAWINGS
[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings described below are only some of the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained according to the structures shown in these drawings without creative labor.
[0023] Figure 1 is a cross-sectional structure schematic diagram for showing a single battery provided by the embodiment one of the present application;
[0024] Figure 2 is a cross-sectional schematic diagram for showing a heat-conducting layer provided by the embodiment two of the present application;
[0025] Figure 3 is a cross-sectional schematic diagram for showing a heat-conducting layer and a heat-dissipating layer provided by the embodiment three of the present application;
[0026] Figure 4 is a cross-sectional schematic diagram for showing a second adhesive layer provided by the embodiment four of the present application;
[0027] Figure 5 is a cross-sectional schematic diagram for showing a base body and a protruding part provided by the embodiment five of the present application.
[0028] Explanation of reference numerals:
[0029] 20, shell; 30, roll core assembly; 31, positive plate; 32, diaphragm; 33, negative plate; 40, adhesive paper assembly; 41, first adhesive layer; 42, heat-conducting layer; 43, expansion layer; 431, base body; 432, protruding part; 44, heat-dissipating layer; 45, second adhesive layer; 50, direction arrow. DETAILED DESCRIPTION
[0030] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.
[0031] Embodiment one:
[0032] Please refer to Figure 1 , Figure 1 is a cross-sectional structure schematic diagram for showing a single battery provided by the embodiment one of the present application.
[0033] The utility model discloses a single battery, comprising: casing 20, roll core subassembly 30 and gum paper subassembly 40, roll core subassembly 30 sets up in casing 20 inside, and roll core subassembly 30 includes positive plate 31, diaphragm 32 and negative plate 33, and diaphragm 32 sets up between positive plate 31 and negative plate 33.
[0034] In traditional roll core subassembly 30, positive plate 31 and negative plate 33 between and negative plate 33 outside usually all set up diaphragm 32. However, the roll core subassembly 30 of the application does not set up diaphragm 32 at the negative plate 33 outside of the outermost end portion of roll core, so that the negative plate 33 outside surface of this area is exposed.
[0035] In practical application, through the connection of gum paper subassembly 40 and casing 20, the contact area of negative plate 33 and casing 20 is significantly increased, thereby effectively reducing the internal resistance of single battery. In the process of using single battery, gum paper subassembly 40 not only can be electrified, but also can absorb the heat generated by roll core subassembly 30 during work, causing gum paper subassembly 40 to expand and fill the gap between roll core subassembly 30 and casing 20. The expansion improves the stability of roll core, effectively reducing the situation that the battery safety protection device is pulled off due to vibration of roll core subassembly 30, causing roll core subassembly 30 to fail.
[0036] In the embodiment, gum paper subassembly 40 is bonded to roll core subassembly 30, and the material of gum paper subassembly 40 can be copper, aluminum, silver, copper-aluminum alloy, nickel-chromium alloy, silicon, synthetic resin, conductive and heat-conductive glue (for example, silver glue, copper glue, etc.), or the like.
[0037] Further, referring to Figure 1 , the thickness of gum paper subassembly 40 is L4, and 15 μm≤L4≤30 μm.
[0038] In the embodiment, referring to Figure 1 , gum paper subassembly 40 includes a first bonding layer 41 and an expansion layer 43, the first bonding layer 41 is arranged on the side of the expansion layer 43 close to the negative plate 33, the first bonding layer 41 is electrically connected to the negative plate 33, and the expansion layer 43 is electrically connected to the casing 20.
[0039] In practical application, the first bonding layer 41 is used for the electrical connection of the expansion layer 43 and the negative plate, and the electrical connection of the expansion layer 43 and the casing 20 enables the expansion layer 43 to expand when electrified or absorbs heat during the use of the battery, thereby filling the gap between the roll core subassembly 30 and the casing 20. This expansion not only increases the contact area of the negative plate 33 and the casing 20, but also improves the stability of the battery and reduces the failure of the assembly caused by vibration and other factors.
[0040] In the embodiment of the present application, the material of the first adhesive layer 41 can be conductive and heat-conductive glue (for example, silver glue, copper glue, etc.). The material of the expansion layer 43 can be copper, aluminum, silver, copper-aluminum alloy, nickel-chromium alloy, silicon, synthetic resin, etc.
[0041] Embodiment II:
[0042] Referring to Figure 2 , the adhesive paper assembly 40 comprises a heat-conductive layer 42, which is arranged between the first adhesive layer 41 and the expansion layer 43, and is connected with the first adhesive layer 41 on one side and the expansion layer 43 on the other side.
[0043] In actual application, the heat-conductive layer 42 effectively transmits heat to the expansion layer 43, so that the expansion layer 43 can expand faster when the battery is powered on, thereby rapidly filling the gap between the core assembly 30 and the shell 20. This not only improves the stability of the core assembly 30, but also enhances the thermal adaptability of the battery during operation, reducing the failure or damage of the battery due to factors such as vibration and thermal expansion.
[0044] In the embodiment, the heat-conductive layer 42 can be copper foil, silica gel, epoxy resin, etc.
[0045] Further, referring to Figure 2 , the thickness of the expansion layer 43 is L1, and the thickness of the heat-conductive layer 42 is L2, 1≤L2 / L1≤5.
[0046] In actual application, the thicker heat-conductive layer 42 (L2) can more effectively conduct heat from the core assembly 30 to the expansion layer 43, which helps to improve the expansion speed of the expansion layer 43.
[0047] Further, referring to Figure 2 , 5μm≤L1≤10μm, 5μm≤L2≤15μm.
[0048] Embodiment III:
[0049] In the embodiment, referring to Figure 3 , the adhesive paper assembly 40 comprises a heat-dissipating layer 44, which is arranged on the side of the expansion layer 43 close to the shell 20, and the expansion layer 43 is connected with the shell 20 through the heat-dissipating layer 44.
[0050] In practical applications, the setting of the heat dissipation layer 44 improves the overall efficiency and safety of the battery. By optimizing the heat conduction path, the heat accumulation of the expansion layer 43 and the roll core assembly 30 is reduced, while the expansibility of the expansion layer 43 is guaranteed, effectively avoiding the safety risks caused by excessive temperature or insufficient expansion of the battery, making the battery more safe and reliable during use, especially in high-temperature or high-load working environments, effectively reducing the risk of fire or explosion caused by overheating.
[0051] In the present embodiment, the material of the heat dissipation layer 44 can be copper foil, silica gel, epoxy resin, etc.
[0052] Further, referring to Figure 3 , the thickness of the expansion layer 43 is L1, and the thickness of the heat dissipation layer 44 is L3, 1≤L3 / L1≤4.
[0053] In practical applications, the heat dissipation layer 44 is located outside the expansion layer 43, and its main function is to accelerate the conduction and dissipation of heat, reducing the temperature of the battery in high-power working state, thereby avoiding overheating of the battery. The thickness of the heat dissipation layer 44 is controlled within a range with a proper ratio to the expansion layer 43, which helps to ensure that the heat dissipation layer 44 can efficiently dissipate heat while not affecting the expansion ability of the expansion layer 43.
[0054] Further, referring to Figure 3 , 4pm≤L1≤10pm, 4pm≤L3≤12pm.
[0055] Optionally, referring to Figure 3 , the adhesive paper assembly 40 further comprises a heat conduction layer 42, which is arranged between the first adhesive layer 41 and the expansion layer 43, and one side of the heat conduction layer 42 is connected with the first adhesive layer 41, and the other side is connected with the expansion layer 43.
[0056] In practical applications, the presence of the heat conduction layer 42 enables the heat to be conducted more quickly to the expansion layer 43 and the heat dissipation layer 44. The expansion layer 43 can timely absorb heat and expand to fill the gap, increasing the stability of the battery, while the heat dissipation layer 44 can accelerate the dissipation of heat, reducing the overall temperature of the battery. This synergistic effect ensures the temperature control performance of the battery during operation, effectively preventing overheating problems and improving the overall safety and service life of the battery. The timely conduction and dissipation of heat helps to reduce the internal resistance of the battery, avoiding performance degradation or overheating damage caused by high temperature. The optimization of thermal management enables the battery to maintain a low internal resistance even under long-term use or high-power output, thereby improving the overall efficiency and stability of the battery.
[0057] Embodiment Four:
[0058] In an embodiment, referring to Figure 4The adhesive paper assembly 40 comprises a second adhesive layer 45, which is arranged around the expansion layer 43 and connects the expansion layer 43 and the shell 20 through the second adhesive layer 45.
[0059] In practical application, the second adhesive layer 45 ensures the reliable electrical connection and mechanical fixation between the expansion layer 43 and the shell 20, provides stable connection, and ensures that the adhesive paper assembly 40 can continuously play its role under the thermal expansion and working state of the battery.
[0060] In the embodiment, the material of the second adhesive layer 45 can be copper adhesive, silver adhesive, etc.
[0061] Embodiment five:
[0062] In the embodiment, with reference to Figure 5 The expansion layer 43 comprises a base body 431 and a protruding part 432, the base body 431 is connected with the first adhesive layer 41, and the protruding part 432 is arranged at both ends of the base body 431 in the height direction of the roll core assembly 30 and abuts against the shell 20. The height direction of the roll core assembly 30 is the direction indicated by the direction arrow 50. Figure 5
[0063] In practical application, the protruding part 432 makes the expansion layer 43 form a protruding structure at both ends of the roll core assembly 30, which can effectively abut against the shell 20. When the protruding part 432 expands, it can not only expand in the height direction of the roll core assembly 30, but also expand in a plane perpendicular to the height direction of the roll core assembly 30. The expansion layer 43 can limit the vibration of the roll core assembly 30 in the above two directions under the pressure generated when the expansion layer 43 expands, which can further reduce the displacement and deformation of the roll core assembly 30 caused by vibration, thereby reducing the structural damage and safety hazards inside the battery.
[0064] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture, and if the specific posture changes, the directional indications will also change accordingly.
[0065] It should also be noted that when an element is referred to as being “fixed to” or “arranged on” another element, it can be directly on the other element or can have a middle element. When an element is referred to as being “connected” to another element, it can be directly connected to the other element or can be indirectly connected to the other element through a middle element.
[0066] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the technical features or implying the number of the technical features indicated. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In addition, the technical solutions of various embodiments can be combined with each other, but must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist, nor in the protection scope required by the present application.
[0067] The above is only the preferred embodiment of the present application, and does not limit the patent range of the present application. Any equivalent structural transformation made by using the content of the present application specification and drawings, or directly / indirectly applied in other related technical fields under the utility model concept of the present application is included in the patent protection scope of the present application.
Claims
1. A single cell, characterized by, The application relates to a battery, which comprises the following components: a shell; a winding core assembly arranged in the shell, the winding core assembly comprising a positive electrode sheet, a diaphragm and a negative electrode sheet, the diaphragm being arranged between the positive electrode sheet and the negative electrode sheet; a gum paper assembly arranged around the winding core assembly, one side of the gum paper assembly being electrically connected to the negative electrode sheet, and the other side being electrically connected to the shell, the gum paper assembly being used for swelling after being electrified or absorbing heat.
2. The cell according to claim 1, wherein The gum paper assembly comprises a first adhesive layer and a swelling layer, the first adhesive layer being arranged on the side of the swelling layer close to the negative electrode sheet, the first adhesive layer being electrically connected to the negative electrode sheet, and the swelling layer being electrically connected to the shell.
3. The cell according to claim 2, wherein The gum paper assembly comprises a heat-conducting layer arranged between the first adhesive layer and the swelling layer, one side of the heat-conducting layer being connected to the first adhesive layer, and the other side being connected to the swelling layer.
4. The cell according to claim 3, wherein The thickness of the swelling layer is L1, the thickness of the heat-conducting layer is L2, and 1<=L2 / L1<=5.
5. The cell according to claim 4, wherein 5um<=L1<=10um, and 5um<=L2<=15um.
6. The cell according to claim 2, wherein The gum paper assembly comprises a heat-dissipating layer arranged on the side of the swelling layer close to the shell, the swelling layer being connected to the shell through the heat-dissipating layer.
7. The cell according to claim 6, wherein The thickness of the swelling layer is L1, the thickness of the heat-dissipating layer is L3, and 1<=L3 / L1<=4.
8. The cell according to claim 7, wherein 4um<=L1<=10um, and 4um<=L3<=12um.
9. The cell according to claim 6, wherein The gum paper assembly further comprises a heat-conducting layer arranged between the first adhesive layer and the swelling layer, one side of the heat-conducting layer being connected to the first adhesive layer, and the other side being connected to the swelling layer.
10. The single cell according to any one of claims 1 to 9, characterized in that, The thickness of the gum paper assembly is L4, and 15um<=L4<=30um.
11. The cell according to claim 2, wherein The gum paper assembly comprises a second adhesive layer arranged around the swelling layer, the swelling layer being connected to the shell through the second adhesive layer.
12. The cell according to claim 2, wherein The swelling layer comprises a base body and a protruding part, the base body being connected to the first adhesive layer, and the protruding part being arranged at both ends of the base body in the height direction of the winding core assembly and abutting against the shell.