Lithium ion battery structure
By creating a single-unit accommodating space through a partition plate inside the lithium-ion battery casing, and by using an injection-molded cover plate and electrode post integrally formed, the problems of low space utilization and heavy weight of lithium-ion batteries are solved, achieving efficient space utilization and cost reduction.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-28
- Publication Date
- 2026-03-20
AI Technical Summary
Existing lithium-ion batteries have low space utilization, are heavy, and involve unnecessary packaging waste, leading to increased costs.
The inner cavity of the outer shell is divided into multiple individual accommodating spaces by a dividing plate. The core is directly assembled, and the pole and plastic plate are integrally molded with the outer shell by injection molding cover plate to form a sealed structure, simplifying the top cover structure and achieving high bonding strength and waterproof and airtightness of the materials.
It improves space utilization, reduces manufacturing costs, simplifies the assembly process, and achieves lightweight and environmental friendliness.
Smart Images
Figure CN224020763U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of lithium ion battery, especially to a lithium ion battery structure directly assembled to module by core (roll core, stack core or soft package battery). BACKGROUND
[0002] Generally speaking, only one pole core or multiple pole cores in parallel state are arranged in the shell of the battery, and the single pole core or multiple parallel pole cores cannot improve the voltage of the whole battery. For example, the voltage of lithium titanate battery is 2.4 volts; the voltage of lithium iron phosphate battery is 3.2 volts; the voltage of ternary battery is 3.7 volts; and the voltage of multi-element polymer battery is 4.3 volts. Therefore, when high voltage (high capacity) is required, a large number of batteries are connected in series to form a battery module, and the battery module is assembled into a battery pack; the adjacent two batteries need to be connected through an external connecting piece.
[0003] That is to say, there are 2 layers of packaging from the battery core to the battery shell, the battery core is packaged into a battery module, and multiple battery modules are packaged into a battery, which will cause great space waste. A lot of space in the battery shell which is already small is wasted in these "overpackaging", resulting in low battery energy density; resulting in more battery installation structures, not only increasing the cost, but also increasing the overall weight.
[0004] Therefore, we propose a lithium ion battery structure to improve the battery module space and reduce the weight. CONTENT OF THE UTILITY MODEL
[0005] The utility model discloses a lithium ion battery structure, which can improve the battery module space and reduce the weight.
[0006] A lithium ion battery structure, comprising a shell, the shell is a square cylinder structure with an open top, and the inner cavity of the shell is equally divided into multiple single accommodating spaces by a partition plate;
[0007] A core, the core is a roll core, a stack core or a soft package battery; one end of the core is respectively provided with a positive electrode lug and a negative electrode lug, and each core is accommodated in the single accommodating space;
[0008] An injection molding cover plate, the injection molding cover plate is integrally formed by a plastic plate and a plurality of pole columns through nano injection molding, a sealed space for accommodating a plurality of separated cores is formed between the injection molding cover plate and the square cylinder structure with an open top of the shell, and a connecting channel is formed in the pole column for the electrode lug to pass through.
[0009] Further preferably, the pole column is of an inverted concave structure, the pole column is integrally formed with the injection molding cover plate through nano injection molding, and the connecting channel is a square groove opened on two sides of the pole column.
[0010] Further preferably, a plurality of waist-shaped grooves and a plurality of liquid injection holes are opened on the plastic plate.
[0011] Further preferably, the waist-shaped grooves and the liquid injection holes are located in the middle part of the plastic plate.
[0012] Further preferably, a plurality of clamping grooves are opened on the bottom surface of the plastic plate.
[0013] Further preferably, the clamping grooves are sealingly connected with the partition plate.
[0014] Further preferably, the number of the core bodies is the same as the number of the single body accommodating spaces.
[0015] Further preferably, the number of the waist-shaped grooves and the number of the liquid injection holes are the same as the number of the single body accommodating spaces.
[0016] Further preferably, the upper surface of the square groove and the pole lug penetratingly formed are sealingly welded through a welding bead.
[0017] Compared with the prior art, the lithium ion battery module has the following beneficial effects:
[0018] The lithium ion battery module directly assembles and packages the core bodies to form a battery module from the core bodies to the module, and a new concept of directly winding the core to the module (JTM) is proposed, and the core bodies (winding core, stacked core or soft package battery) are directly assembled into a module power battery; the lithium ion battery module of the utility model is connected in series / parallel from the core level, and is directly assembled into a module, thereby reducing the manufacturing cost and improving the space utilization.
[0019] The plastic plate and the pole column are integrally formed through nano injection molding, the combination strength between different materials and excellent waterproof air tightness are improved, the number of parts of the top cover structure is reduced, the assembly of the top cover structure is simplified, the top cover structure is lightweight, and the entire integrated battery top cover plate structure does not need to use a sealing ring containing fluorine material under the action of excellent waterproof air tightness of nano injection molding, and green environmental protection is realized. BRIEF DESCRIPTION OF DRAWINGS
[0020] Figure 1 is an explosion schematic view of the utility model;
[0021] Figure 2 is a structure schematic view of the injection molding cover plate 3;
[0022] Figure 3 is a sectional view of the injection molding cover plate 3;
[0023] Figure 4 It is a structural schematic view of the core 2;
[0024] Figure 5 It is a structural schematic view of the shell 1;
[0025] Figure 6 It is a structural schematic view of the shell 1 loading the core 2;
[0026] Figure 7 It is an assembly schematic view of the utility model.
[0027] In the figure: shell 1, core 2, injection molding cover plate 3, welding bead 4, plastic plate 31, pole column 32, waist-shaped groove 311, liquid injection hole 312, square groove 321, clamping groove 313, tab 21, monomer containing space 11, partition plate 12. DETAILED DESCRIPTION
[0028] The technical scheme in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments.
[0029] Referring to Figures 1-7 A lithium ion battery structure, comprising a shell 1, the shell 1 is a square cylinder structure with the upper side open, the inner cavity of the shell 1 is evenly divided into multiple monomer containing spaces 11 by a partition plate 12.
[0030] The shell 1, as the outermost shell, plays a protective support role, is used for containing multiple cores 2, and the partition plate 12 can be a plug-in plate directly inserted into the inside of the shell 1, so that the inner cavity of the shell 1 is divided into multiple monomer containing spaces 11; or the partition plate 12 is integrally formed with the shell 1.
[0031] In a specific embodiment of the utility model, the material of the shell 1 and the partition plate 12 is aluminum.
[0032] The core 2, the core 2 is a roll core, a stacked core or a soft package battery; one end of the core 2 is respectively provided with a positive electrode tab and a negative electrode tab, and each core 2 is contained in the monomer containing space 11;
[0033] In a specific embodiment of the utility model, the core 2 is four, the four cores 2 are respectively arranged in the four monomer containing spaces 11, the core 2 is prepared by winding a plurality of small electric cores through a winding process, and one end of the core 2 is respectively provided with a pair of positive electrode tabs and a pair of negative electrode tabs. Among them, a pair of positive electrode tabs are respectively inserted into the square grooves 321 on both sides of one end pole column 32, and a pair of negative electrode tabs are respectively inserted into the square grooves 321 on both sides of the other end pole column 32.
[0034] An injection cover plate 3 is integrally formed by nano-injection molding of a plastic plate 31 and a plurality of pole columns 32, and forms a seal between the open square cylinder on the upper side of the shell 1 for containing a plurality of separated cores 2, and a connecting passage is provided on the pole column 32 for the tab to pass through.
[0035] In a specific embodiment of the present application, the injection cover plate 3 and the shell 1 are matched to form a seal; ultrasonic hot melt welding or laser welding can be used to ensure the sealing of the entire shell and the sealing of the single containment space 11; the plastic plate 31 is made of plastic material, which is not limited here and can be PPS material, PP, PET, PI, etc. injection material.
[0036] The pole column 32 is made of metal material, and the pole column 32 includes a positive pole column and a negative pole column, which are arranged on both sides of the injection cover plate 3 corresponding to each single containment space 11, such as the material of the positive pole column is aluminum, and the material of the negative pole column is copper, the plastic plate 31 and the pole column 32 are integrally formed by nano-injection molding, and a connecting passage is provided on both sides of each pole column 32 for the tab to pass through.
[0037] The pole column 32 is a concave structure, the pole column 32 is integrally formed with the plastic plate 31 by nano-injection molding, and the connecting passage is a square groove 321 provided on both sides of the pole column 32.
[0038] In a specific embodiment of the present application, the pole column 32 is integrally formed with the plastic plate 31 by nano-injection molding, which improves the bonding stability between different materials, not only strengthens the connection strength of the pole column 32 and the plastic plate 31, but also improves the sealing effect between the plastic plate 31 and the pole column 32.
[0039] The plastic plate and the pole column are integrally formed by nano-injection molding, which improves the bonding strength between different materials and excellent waterproof air tightness, while reducing the number of parts of the top cover structure, simplifying the assembly of the top cover structure, and making the top cover structure lightweight; due to the excellent waterproof air tightness of the entire integrated battery top cover plate structure, a sealing ring containing fluorine material is not required, achieving green environmental protection.
[0040] A plurality of waist grooves 311 and a plurality of liquid injection holes 312 are provided on the plastic plate 31; the waist grooves 311 and the liquid injection holes 312 are located in the middle of the plastic plate 31.
[0041] In a specific embodiment of the utility model, waist type groove 311 and liquid injection hole 312 are arranged on plastic plate 31, the waist type groove 311 is used to install explosion-proof valve, and liquid injection hole 312 is used to inject liquid and exhaust into monomer containing space 11; according to actual needs, electrolyte can be injected. Wherein, the number of waist type groove 311 and liquid injection hole 312 is same with the number of monomer containing space 11, so as to realize the independent control of explosion-proof valve and liquid injection hole and corresponding monomer containing space 11.
[0042] The bottom surface of the plastic plate 31 is provided with a plurality of clamping grooves 313; the clamping grooves 313 are sealingly clamped with the partition plate 12.
[0043] In a specific embodiment of the utility model, the number of clamping grooves 313 is 3, and the shape of clamping groove 313 is convex. By sealingly clamping clamping groove 313 with partition plate 12, monomer containing space 11 is individually separated to form independent containing space.
[0044] The number of the core 2 is same with the number of the monomer containing space 11.
[0045] In a specific embodiment of the utility model, the number of core 2 and monomer containing space 11 is 4, and the number of core 2 and monomer containing space 11 is not limited here, which can be 5, 6, 7, 8, etc.
[0046] The number of the waist type groove 311 and the liquid injection hole 312 is same with the number of the monomer containing space 11.
[0047] In a specific embodiment of the utility model, the waist type groove 311 is used to install explosion-proof valve, and liquid injection hole 312 is used to inject liquid and exhaust into monomer containing space 11; according to actual needs, electrolyte can be injected; the number of waist type groove 311 and liquid injection hole 312 is same with the number of monomer containing space 11, so that each monomer containing space 11 is provided with corresponding explosion-proof valve and liquid injection hole, and each core 2 can be controlled independently.
[0048] The upper surface of the square groove 321 is sealingly welded with the through-out tab through weld 4.
[0049] In a specific embodiment of the utility model, ultrasonic hot melt welding or laser welding can be used between square groove 321 and tab.
[0050] The utility model discloses a lithium ion battery module directly carries out the assembly packaging to the core body, forms a kind of battery module from core body to module, proposes a brand-new concept (JTM) of winding core direct to module, and the power battery is directly assembled as module from core body (winding core, core or soft package battery);The utility model discloses a lithium ion battery module, and the series / parallel connection is carried out from core body level, and direct assembly is module, reduces manufacturing cost, improves space utilization.
Claims
1. A lithium-ion battery structure, characterized in that, include: The outer shell is a square cylindrical structure with an open top, and the inner cavity of the outer shell is divided into multiple individual accommodating spaces by a dividing plate; The core is a wound core, a stacked core, or a pouch battery; one end of the core is respectively provided with a positive electrode tab and a negative electrode tab, and each core is accommodated in the single-cell housing space; The injection molded cover plate is integrally formed from a plastic sheet and several pole pieces through nano-injection molding. The injection molded cover plate and the open square cylinder on the upper side of the outer shell form a seal to accommodate multiple separated cores. The pole pieces are provided with connecting channels for the pole tabs to pass through.
2. The lithium-ion battery structure according to claim 1, characterized in that, The electrode post has an inverted concave structure and is integrally formed with the injection molded cover plate through nano-injection molding. The connection channel is a square groove opened on both sides of the electrode post.
3. A lithium-ion battery structure according to claim 2, characterized in that, The plastic sheet has several waist-shaped grooves and several injection holes.
4. A lithium-ion battery structure according to claim 3, characterized in that, The waist-shaped groove and the injection hole are located in the middle of the plastic sheet.
5. A lithium-ion battery structure according to claim 1, characterized in that, The bottom surface of the plastic sheet has several slots.
6. A lithium-ion battery structure according to claim 5, characterized in that, The slot is sealed and engaged with the dividing plate.
7. A lithium-ion battery structure according to claim 1, characterized in that, The number of cores is the same as the number of accommodating spaces in the single unit.
8. A lithium-ion battery structure according to claim 3, characterized in that, The number of the waist-shaped grooves and the number of the injection holes are the same as the number of the single-unit accommodating spaces.
9. A lithium-ion battery structure according to claim 2, characterized in that, The upper surface of the square groove is sealed and welded to the through-hole electrode lug by a weld bead.