Lithium ion battery module
By adopting a nano-injection molding integrated structure of plastic blocks and connecting pieces in lithium-ion battery modules, vertical welding of the tabs and terminals is achieved, solving the problem of damage to the battery cells caused by horizontal welding of the tabs in traditional lithium-ion battery modules, improving welding quality and space utilization, and reducing manufacturing costs.
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
In traditional lithium-ion battery module manufacturing, the horizontal bending of the tabs and their horizontal welding connection to overlap with the lower surface of the terminal post can easily damage the battery cell. Furthermore, the limited welding space makes operation inconvenient and affects the welding quality.
The pole assembly is made of plastic block and connecting piece through nano-injection molding. The connecting piece is vertically inserted and welded to the pole tab vertically, replacing the traditional horizontal welding method. It is combined with ultrasonic hot melt or laser welding to achieve sealing.
This effectively avoids damage to the battery cell, increases welding space, improves welding quality, reduces manufacturing costs, and increases space utilization.
Smart Images
Figure CN224021006U_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] The traditional battery system manufacturing method is to manufacture the battery core first, then assemble the battery module from the battery core, and finally install the battery module in the battery box. The BOM cost of the battery system includes the cost of the battery core, the cost of the module and the cost of the system PACK material, and the manufacturing cost also includes the manufacturing cost of the battery core, the manufacturing cost of the module and the manufacturing cost of the system.
[0003] In order to reduce the cost of the battery system and increase the efficiency, the JTM (Jerry-roll To Module) mode is proposed, that is, the core is directly connected to the module, that is, all single-core bodies are connected in series and fixed in the battery box to form a whole module battery module. Its advantages are to improve the utilization rate of the battery box, reduce the number of battery package parts, improve the production efficiency and reduce the cost.
[0004] However, in the traditional mode, the tab is horizontally bent and horizontally welded with the lower surface of the pole, usually using torque welding or penetration welding to connect the tab and the pole, and the tab is horizontally welded with the lower surface of the pole, which is easy to damage the battery below, and the welding space is limited, which is not convenient for welding operation.
[0005] Therefore, we propose a lithium ion battery module to solve the connection problem of the tab in the JTM mode. Utility model content
[0006] The utility model discloses a lithium ion battery module, including the shell, the shell is the square cylinder structure of upside open, the inner chamber of the shell is divided into a plurality of single body containing space by the division board, the core body is the roll core, the stack core or the soft package battery, the core body is equipped with the tab in one end, and each core body is contained in the single body containing space, the pole assembly is by the plastic block and the connecting piece and is integrally formed through nano injection, the connecting piece is vertically inserted in the inner chamber of the plastic block, and the upper and lower ends of the connecting piece extend out the upper and lower surfaces of the plastic block respectively, and the lower end of the connecting piece is vertically connected with the tab.
[0007] The utility model discloses a lithium ion battery module, including the shell, the shell is the square cylinder structure of upside open, the inner chamber of the shell is divided into a plurality of single body containing space by the division board, the core body is the roll core, the stack core or the soft package battery, the core body is equipped with the tab in one end, and each core body is contained in the single body containing space, the pole assembly is by the plastic block and the connecting piece and is integrally formed through nano injection, the connecting piece is vertically inserted in the inner chamber of the plastic block, and the upper and lower ends of the connecting piece extend out the upper and lower surfaces of the plastic block respectively, and the lower end of the connecting piece is vertically connected with the tab.
[0008] Further preferably, the top cover is provided with a plurality of waist-shaped grooves and a plurality of liquid injection holes.
[0009] Further preferably, the waist-shaped grooves and the liquid injection holes are located in the middle of the top cover.
[0010] Further preferably, the bottom surface of the top cover is provided with a plurality of clamping grooves.
[0011] Further preferably, the clamping grooves are sealingly connected with the partition plates.
[0012] Further preferably, the number of the core bodies is the same as the number of the single body accommodating spaces.
[0013] Further preferably, the number of the waist-shaped grooves and the liquid injection holes is the same as the number of the single body accommodating spaces.
[0014] Compared with the prior art, the lithium ion battery module has the advantages that:
[0015] The connecting piece is vertically lap-welded with the tab to replace the horizontal welding of the tab after being horizontally bent and coinciding with the lower surface of the pole in the traditional mode, so that damage to the battery cell below during welding is effectively avoided, the welding space is increased, and the welding quality between the connecting piece and the tab is ensured.
[0016] The lithium ion battery module directly assembles and packages the core body to form a battery module from the core body to the module, and a new concept of directly winding the core to the module (JTM) is proposed, and the core body (winding core, stacked core or soft package battery) is directly assembled into a module power battery. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1 It is an explosion schematic view of the utility model;
[0018] Figure 2 It is a structural schematic view of the pole assembly 3;
[0019] Figure 3 It is a structural schematic view of the top cover 4;
[0020] Figure 4 It is a structural schematic view of the core body 2;
[0021] Figure 5 It is a structural schematic view of the shell 1;
[0022] Figure 6 It is a structural schematic view of the shell 1 loaded with the core body 2;
[0023] Figure 7This is a schematic diagram of the structure when the pole assembly 3 is connected to the core 2;
[0024] Figure 8 This is an assembly diagram of the present invention.
[0025] In the diagram: 1. Outer shell; 2. Core; 3. Terminal assembly; 4. Top cover; 11. Individual housing space; 12. Divider plate; 21. Terminal tab; 31. Plastic block; 32. Connecting piece; 41. Terminal mounting hole; 42. Waist-shaped groove; 43. Liquid injection hole. Detailed Implementation
[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.
[0027] Reference Figures 1-8 A lithium-ion battery module includes a housing 1, which is a square cylindrical structure with an open upper side. The inner cavity of the housing 1 is divided into multiple individual accommodating spaces 11 by a dividing plate 12.
[0028] The outer shell 1, as the outermost shell, serves as a protective and supportive layer and is used to house multiple cores 2. The dividing plate 12 can be an insert plate that is directly inserted into the interior of the outer shell 1 to divide the inner cavity of the outer shell 1 into multiple individual accommodating spaces 11; or the dividing plate 12 can also be a structure formed integrally with the outer shell 1.
[0029] In one specific embodiment of this utility model, both the outer shell 1 and the dividing plate 12 are made of aluminum.
[0030] Core 2, wherein the core 2 is a wound core, stacked core or soft pack battery; one end of the core 2 is provided with a tab 21, and each core 2 is accommodated in the single cell accommodating space 11;
[0031] In one specific embodiment of this utility model, there are 4 cores 2, which are respectively arranged in 4 individual accommodating spaces 11. The core 2 is prepared by rolling multiple small cells through a core rolling process. One end of the core 2 is respectively provided with a positive electrode tab and a negative electrode tab. The positive electrode tab and the negative electrode tab are arranged vertically and are fixedly connected to the lower end of the connecting piece 32.
[0032] The electrode assembly 3 is integrally formed by a plastic block 31 and a connecting piece 32 through nano-injection molding. The connecting piece 32 is vertically inserted into the inner cavity of the plastic block 31, and the upper and lower ends of the connecting piece 32 extend through the upper and lower surfaces of the plastic block 31, respectively. The lower end of the connecting piece 32 is vertically overlapped and fixedly connected to the electrode tab 21.
[0033] In a specific embodiment of the utility model, the plastic block 31 is made of plastic material, which is not limited here and can be PPS material, PP, PET, PI or other injection molding materials; the connecting piece 32 is made of metal material, and the connecting piece 32 includes a positive connecting piece and a negative connecting piece, such as the positive connecting piece made of aluminum and the negative connecting piece made of copper; the plastic block 31 and the connecting piece 32 are integrally formed by nano injection molding, which improves the bonding stability between different materials, strengthens the connection strength of the plastic block 31 and the connecting piece 32, improves the sealing effect between the plastic block 31 and the connecting piece 32, reduces the number of parts of the pole assembly structure, simplifies the assembly of the pole assembly, and makes the pole assembly structure lightweight.
[0034] In a specific embodiment of the utility model, the connecting piece 32 vertically penetrates the plastic block 31 from the middle, the connecting piece 32 at the lower end of the plastic block 31 is used for vertical lap joint with the tab 21, and the tab 21 and the connecting piece 32 are fixed by welding; the connecting piece 32 at the upper end of the plastic block 31 is used for series / parallel connection between the cores 2.
[0035] The utility model replaces the traditional mode of horizontal welding of the tab after horizontal bending and the lower surface of the pole by vertical lap joint welding of the penetrating connecting piece 32 and the tab 21, effectively avoids the interference of adjacent cores, and ensures the welding quality between the connecting piece 32 and the tab 21.
[0036] The top cover 4 is formed between the top cover 4 and the square cylinder of the upper side of the shell 1, and a plurality of pole mounting holes 41 for mounting the pole assembly 3 are arranged on the surface of the top cover 4.
[0037] In a specific embodiment of the utility model, the top cover 4 and the shell 1 are matched to form a seal; ultrasonic hot melting welding or laser welding can be used to ensure the sealing of the entire shell and the sealing of the single cell accommodating space 11.
[0038] In a specific embodiment of the utility model, ultrasonic hot melting welding or laser welding can be used between the plastic block 31 on the pole assembly 3 and the pole mounting hole 41 to ensure the sealing between the plastic block 31 and the top cover 4.
[0039] In a specific embodiment of the utility model, the material of the top cover 4 is aluminum.
[0040] In a specific embodiment of the utility model, the connecting piece 32 on the pole assembly 3 and the tab 21 on the core 2 are welded to form a bare cell assembly, the bare cell assembly is then assembled into the single cell accommodating space 11, the top cover 4 is then sleeved on the pole assembly 3 and matched with the shell 1, and finally the fixing between the plastic block 31 and the top cover 4 and between the shell 1 and the top cover 4 is completed by welding.
[0041] The top cover 4 is provided with a plurality of waist-shaped grooves 42 and a plurality of liquid injection holes 43; the waist-shaped grooves and the liquid injection holes are located in the middle of the top cover 4.
[0042] In a specific embodiment of the utility model, the top cover 4 is provided with a waist-shaped groove 42 and a liquid injection hole 43, the waist-shaped groove 42 is used for installing an explosion-proof valve, and the liquid injection hole 43 is used for injecting liquid and exhausting gas into the single accommodating space 11; according to actual needs, electrolyte can be injected. The number of the waist-shaped grooves 42 and the liquid injection holes 43 is the same as the number of the single accommodating spaces 11, so as to realize the independent control of the explosion-proof valves and the liquid injection holes and the corresponding single accommodating spaces 11.
[0043] The bottom surface of the top cover 4 is provided with a plurality of clamping grooves; the clamping grooves are sealingly clamped with the partition plates 12.
[0044] In a specific embodiment of the utility model, the number of the clamping grooves is three, and the shape of the clamping grooves is convex; the single accommodating spaces 11 are individually separated by the sealing clamping of the clamping grooves and the partition plates 12, so as to form independent accommodating spaces.
[0045] The number of the core bodies 2 is the same as the number of the single accommodating spaces 11.
[0046] In a specific embodiment of the utility model, the number of the core bodies 2 and the single accommodating spaces 11 is four; the number of the core bodies 2 and the single accommodating spaces 11 is not limited here, and can be five, six, seven, eight, etc.
[0047] The number of the waist-shaped grooves 42 and the liquid injection holes 43 is the same as the number of the single accommodating spaces 11.
[0048] In a specific embodiment of the utility model, the waist-shaped grooves 42 are used for installing explosion-proof valves, and the liquid injection holes 43 are used for injecting liquid and exhausting gas into the single accommodating spaces 11; according to actual needs, electrolyte can be injected; the number of the waist-shaped grooves 42 and the liquid injection holes 43 is the same as the number of the single accommodating spaces 11, so that each single accommodating space 11 is provided with a corresponding explosion-proof valve and liquid injection hole, and each core body 2 can be individually controlled.
[0049] The lithium ion battery module directly assembles and packages the core body, forms a battery module from the core body to the module, and proposes a new concept of winding core directly to the module (JTM), that is, the power battery is directly assembled from the core body (winding core, stacked core or soft package battery); the lithium ion battery module directly assembles the module from the core body level, reduces the manufacturing cost, and improves the space utilization.
[0050] The utility model discloses a vertical lap joint welding of the through connecting sheet and the pole lug replaces the horizontal bending of the pole lug in the traditional mode and the horizontal welding of the lower surface of the pole post, effectively avoids the damage of the electric core below when welding, and the welding space is increased, and the operation is convenient, thereby guaranteeing the welding quality between the connecting sheet and the pole lug.
Claims
1. A lithium-ion battery module, 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 provided with a tab, and each core is accommodated within the single-cell housing space. The electrode assembly is integrally formed from a plastic block and a connecting piece through nano-injection molding. The connecting piece is vertically inserted into the inner cavity of the plastic block, and the upper and lower ends of the connecting piece extend through the upper and lower surfaces of the plastic block, respectively. The lower end of the connecting piece is vertically overlapped and fixedly connected to the electrode tab. The top cover forms a seal with the open square cylinder on the upper side of the outer shell to accommodate multiple separated cores. The surface of the top cover has several pole mounting holes for mounting pole assemblies.
2. A lithium-ion battery module according to claim 1, characterized in that, The top cover has several waist-shaped grooves and several injection holes.
3. A lithium-ion battery module according to claim 2, characterized in that, The waist-shaped groove and the injection hole are located in the middle of the top cover.
4. A lithium-ion battery module according to claim 1, characterized in that, The bottom surface of the top cover has several slots.
5. A lithium-ion battery module according to claim 4, characterized in that, The slot is sealed and engaged with the dividing plate.
6. A lithium-ion battery module according to claim 1, characterized in that, The number of cores is the same as the number of accommodating spaces in the single unit.
7. A lithium-ion battery module according to claim 2, 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.