A battery
By employing a shielding structure consisting of an insulating plate and a cover plate stacked in the battery, the tabs and the electrolyte filling hole are isolated, thus solving the problem of short circuit between the tabs and the cover plate and improving the battery's safety and electrolyte filling efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CALB GROUP CO LTD
- Filing Date
- 2025-06-25
- Publication Date
- 2026-06-26
AI Technical Summary
The cover plate at the electrode tab and the liquid injection hole of the battery cell is prone to overlap and short circuit, which affects the battery safety.
An insulating plate and a cover plate assembly are stacked together. The insulating plate has a shielding structure to isolate the electrode tab from the liquid injection hole. The shielding structure includes a first sidewall and a baffle. The first sidewall forms an obtuse angle with the insulating plate, which reduces the space occupied by the shielding structure and improves its strength.
It effectively prevents the tabs from overlapping with the cover assembly at the injection hole, reduces tab warping, avoids battery short circuits, and improves battery safety and injection efficiency.
Smart Images
Figure CN224418001U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of lithium-ion battery technology, and in particular to a battery. Background Technology
[0002] A power battery is a rechargeable battery that provides power to electric vehicles, electric trains, electric bicycles, and other similar vehicles. Power batteries typically consist of multiple battery packs, each containing several to a dozen individual battery cells. These battery packs combine multiple cells in series and parallel. The electrolyte filling port for each individual cell is located on a metal cover. Because the internal tabs of the individual cells are close to the electrolyte filling port, they are prone to contact with the cover, potentially causing a short circuit. Utility Model Content
[0003] The battery provided in this application can isolate the tabs from the metal cover, reduce the risk of short circuit when the tabs and the metal cover are connected, and improve the safety of the battery.
[0004] This application provides a battery comprising: a housing having an opening; a cover assembly disposed at the opening and covering the housing to form a receiving space; a battery cell disposed within the receiving space; an insulating plate stacked on top of the cover assembly and located between the cover assembly and the battery cell; a terminal post disposed on the cover assembly; and a tab disposed within the housing and located between the insulating plate and the battery cell, the tab extending from an end of the battery cell and electrically connected to the terminal post; the cover assembly having a liquid injection hole; the insulating plate having a shielding structure recessed towards the battery cell at a position corresponding to the liquid injection hole, the shielding structure including a first sidewall, a second sidewall, and a baffle; the second sidewall being connected between the first sidewall and the baffle, and the second sidewall having at least one liquid outlet; the first sidewall being connected to the insulating plate and having an angle α with the insulating plate, the angle α being an obtuse angle.
[0005] In the above embodiments, some tabs are suspended in the electrolyte or in a hanging state within the casing. The shielding structure on the insulating plate isolates the tabs suspended in the electrolyte or in a hanging state from the injection hole, reducing the risk of overlap between the tabs and the cover assembly at the injection hole. Furthermore, the first sidewall has an angle with the insulating plate; compared to a first sidewall perpendicular to the insulating plate, the inclined first sidewall allows for a smaller baffle area, thereby increasing the strength of the shielding structure. Simultaneously, it also allows for a smaller shielding structure volume, occupying less space within the casing, enabling the shielding structure to be positioned further away from the tabs, thus providing more space for them. This prevents the tabs from resting on the shielding structure, ensuring the distance between the tab end and the battery cell is not too close, preventing the tabs from being inserted upside down and contacting the battery cell, and avoiding battery short circuits. It also reduces the likelihood of the tabs tilting due to the obstruction of the shielding structure. Attached Figure Description
[0006] Figure 1 A schematic diagram of the battery structure provided in one embodiment of this application;
[0007] Figure 2 An exploded view of a cover plate assembly and an insulating plate provided for one embodiment of this application;
[0008] Figure 3 This is a schematic diagram of the shielding structure provided in one embodiment of the present application;
[0009] Figure 4 A partial schematic diagram of a cover plate assembly, an insulating plate, and a shielding structure provided for one embodiment of this application;
[0010] Figure 5 A top view of the second sidewall and baffle provided in one embodiment of this application;
[0011] Figure 6 A partial schematic diagram of a cover plate assembly, an insulating plate, and a shielding structure provided for another embodiment of this application;
[0012] Figure 7 A partial schematic diagram of a cover plate assembly, an insulating plate, and a shielding structure provided for another embodiment of this application;
[0013] Figure 8 A partial schematic diagram of a cover plate assembly, an insulating plate, and a shielding structure provided for another embodiment of this application.
[0014] Figure label:
[0015] 1-Housing; 2-Cover assembly; 3-Insulating plate; 4-Position post; 5-Battery cell; 6-Electrical tab; 21-Injection hole; 7-Shielding structure; 71-First sidewall; 711-First part; 712-Second part; 72-Second sidewall; 73-Baffle; 74-Outlet; 8-Explosion-proof valve; 22-Boss. Detailed Implementation
[0016] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description of the application is provided in conjunction with the accompanying drawings and embodiments.
[0017] The terminology used in the following embodiments is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. As used in the specification and appended claims of this application, the singular expressions “a,” “an,” “the,” “the,” “the,” and “this” are intended to also include expressions such as “one or more” unless the context clearly indicates otherwise.
[0018] References to “an embodiment” or “a specific embodiment” as used in this specification mean that one or more embodiments of this application include a particular feature, structure, or characteristic described in connection with that embodiment. The terms “comprising,” “including,” “having,” and variations thereof mean “including, but not limited to,” unless otherwise specifically emphasized.
[0019] In some related technologies, a battery cell is the smallest unit in a battery that provides energy. A battery cell mainly includes a housing and a battery cover assembly that enclose a cavity, a cell assembly disposed within the cavity, and electrolyte that fills the cavity through an injection hole on the battery cover assembly.
[0020] A battery cell mainly consists of a positive electrode, a negative electrode, and a separator, all wound together, as well as a Mylar coating that provides insulation and protection for the cell assembly. The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The uncoated positive current collector layers are stacked together to form the positive electrode tab, which is used for electrical connection to the positive terminal on the battery cover assembly. Similarly, the negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The uncoated negative current collector layers are stacked together to form the negative electrode tab, which is used for electrical connection to the negative terminal on the battery cover assembly. Taking a lithium-ion battery as an example, the positive current collector can be made of aluminum, the positive active material layer can be made of lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc., the negative current collector can be made of copper, and the negative active material layer can be made of carbon or silicon, etc. The membrane material can be PP (polypropylene) or PE (polyethylene), etc.
[0021] During the manufacturing process, the battery cell is first placed inside the casing, then the battery cover is fitted onto the casing, and then electrolyte is injected into the cavity formed by the cover assembly and the casing through the injection hole on the battery cover assembly. Finally, the injection hole on the cover assembly is sealed with a sealing pin.
[0022] Because the tabs are close to the filling hole, short circuits can easily occur due to the overlap of the cover plate at the filling hole. Reliably isolating the cover plate at the filling hole from the tabs to improve the safety of the battery cell is a technical problem that urgently needs to be solved by those skilled in the art.
[0023] In view of this, embodiments of the present disclosure provide a battery to reduce the overlap between the internal electrode tabs and the battery cover, thereby improving the safety of the individual battery cells. Embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings.
[0024] Figure 1This is a schematic diagram of the battery structure provided in one embodiment of this application. Figure 2 An exploded view of a cover plate assembly and an insulating plate provided in one embodiment of this application. Figure 3 This is a schematic diagram of the shielding structure provided in one embodiment of this application. Figure 4 This is a partial schematic diagram of a cover plate assembly, an insulating plate, and a shielding structure provided for one embodiment of this application. Figures 1 to 4 This application provides a battery comprising: a housing 1, a cover assembly 2, an insulating plate 3, terminals 4, a battery cell 5, and tabs 6. The housing 1 has an opening, and the cover assembly 2 is disposed at the opening of the housing 1, covering the housing 1 to form a receiving space, in which the battery cell 5 is disposed. The insulating plate 3 is stacked with the cover assembly 2, and the insulating plate 3 is located between the cover assembly 2 and the battery cell 5. The insulating plate 3 and the cover assembly 2 have corresponding through holes, and the terminals 4 are installed in the through holes. The tabs 6 are disposed inside the housing 1, located between the insulating plate 3 and the battery cell 5, and extend from the end of the battery cell 5 and are electrically connected to the terminals 4. The cover plate assembly 2 is provided with a liquid injection hole 21. The insulating plate 3 is provided with a shielding structure 7 recessed into the battery cell 5 at the corresponding position of the liquid injection hole 21. The shielding structure 7 includes a first sidewall 71, a second sidewall 72, and a baffle 73. The second sidewall 72 is connected between the first sidewall 71 and the baffle 73, and the second sidewall 72 is provided with at least one liquid outlet 74. The first sidewall 71 is connected to the insulating plate 3 and has an angle α with the insulating plate 3, which is an obtuse angle.
[0025] In the above embodiment, the tab 6 includes a positive tab and a negative tab, which extend from the end of the battery cell 5 to the outside of the battery cell 5. The terminal 4 includes a positive terminal and a negative terminal, which are respectively disposed on both sides of the liquid injection hole 21. The positive tab is electrically connected to the positive terminal, and the negative tab is electrically connected to the negative terminal. Figure 1 The electrode located on the right side can be either a positive or negative electrode. Some electrodes, for example... Figure 1The end A of the middle tab is either suspended in the electrolyte or in a hanging state within the housing 1. The shielding structure 7 on the insulating plate 3 isolates the tab 6, which is suspended in the electrolyte or in a hanging state, from the injection hole 21, reducing the risk of the tab 6 overlapping with the cover assembly 2 at the injection hole 21. Furthermore, the first sidewall 71 forms an angle with the insulating plate 3. Compared to a first sidewall 71 perpendicular to the insulating plate 3, the inclined first sidewall 71 allows for a smaller area of the baffle 73, thereby increasing the strength of the shielding structure 7. Simultaneously, it also allows for a smaller volume of the shielding structure 7, occupying less space within the housing 1, enabling the shielding structure 7 to be positioned further away from the tab 6, thus providing more space for the tab 6. When the positive tab contacts the negative electrode of the battery cell, or vice versa, it can cause a short circuit in the battery. The shielding structure 7 occupies less space and is farther from the tab, reducing the likelihood of the tab 6 overlapping the shielding structure 7. Because the tab 6 is made of a flexible material, it will bend under external force. If the tab 6 rests on the shielding structure 7, the end A of the tab may bend towards the battery cell. This would cause the end A of the tab to be too close to the battery cell 5, and under vibration, the tab 6 may be inserted upside down and come into contact with the battery cell 5, resulting in a short circuit. The first sidewall 71 and the insulating plate 3 are provided with an angle α to reduce the possibility of the tab 6 bending towards the battery cell 5 due to the obstruction of the shielding structure 7.
[0026] In addition to the electrode post 4 and the filling hole 21, the cover plate assembly 2 can also be equipped with functional components such as an explosion-proof valve 8. The explosion-proof valve 8 can release internal pressure to provide safety protection when the internal pressure of the battery reaches a pressure threshold. Typically, the explosion-proof valve 8 is located in the center of the cover plate assembly 2, and the filling hole 21 is located to one side of the explosion-proof valve 8. Therefore, there is a risk of short circuit due to contact between the positive or negative electrode tab 6 and the cover plate assembly 2 at the filling hole 21. The opening of the aforementioned outlet 74 is away from the tab 6 near the filling hole 21.
[0027] In one embodiment, the insulating plate 3 may be, for example, a plastic insulating plate 3 or a rubber insulating plate 3, and its main function is to insulate and isolate the electrical components inside the housing 1 from the battery cover assembly 2, thereby reducing the risk of short circuit.
[0028] In one embodiment, the included angle α is in the range of 110° < α < 160°. For example, the included angle α can be 115°, 120°, 130°, 140°, 150°, 155°, etc., and is not limited to these values. The first sidewall 71 can be a hollow frustum, with the bottom of the hollow frustum connected to the insulating plate 3. If the included angle α is too large, the first sidewall may block the injection hole 21, and may also make the size of the outlet hole 74 smaller, affecting the injection efficiency. If the included angle α is too small, the volume of the blocking structure 7 will increase, and the effect of the anti-electrode tab 6 being inserted backward into the cell 5 will not be obvious. Therefore, the value of the included angle α is within the above range, which can ensure that the blocking structure 7 occupies less space without affecting the injection efficiency.
[0029] In one embodiment, the distance h between the battery cell and the insulating plate, and the included angle α, satisfy the following relationship: 135 mm° < h × α < 1250 mm°. If the value of h × α is too small, the distance between the battery cell 5 and the end A of the tab will be too close, and the effect of the inclined setting of the first wall will be poor, making it easy for the tab 6 to be inserted upside down, causing a short circuit in the battery. If the value of h × α is too large, it will result in lower electrolyte injection efficiency and lower utilization of the internal space of the battery.
[0030] Figure 5 A top view of the second sidewall and baffle provided in one embodiment of this application, as shown below. Figure 5 Because the electrolyte needs to meet a certain injection pressure when injected into the housing 1 through the injection hole 21, it will have a certain impact on the shielding structure 7. In one embodiment, the second sidewall 72 is arranged perpendicular to the insulating plate 3, and the orthographic projection of the second sidewall 72 on the cover plate assembly 2 is an arc, the central angle β of which satisfies: 160° < β < 200°. For example, the central angle β can be 165°, 170°, 180°, 190°, 195°, etc., and is not limited to these values. The second sidewall 72 is connected to the edge of the baffle 73. The position where the first sidewall 71 is not connected to the baffle 73 forms an outlet hole. The β value is within the above range, which can make the connection strength between the second sidewall 72 and the first sidewall 71 high. Furthermore, the connection strength between the baffle 73 and the second sidewall 72 is also high, which can make the connection between the baffle 73 and the second sidewall 72 firm even when the baffle 73 is impacted by the electrolyte.
[0031] In a further embodiment, the distance h between the battery cell and the insulating plate and the included angle α satisfy the following relationship: 130mm° < h×α < 1250mm°. When the central angle β satisfies: 160° < β < 200°, the value of h×α meets the above range, which can ensure high liquid injection efficiency, improve the utilization rate of the accommodating space, and further ensure the effect of the first wall being tilted, avoiding the tabs being inserted into the battery cell inverted, and preventing the battery from short-circuiting.
[0032] In one specific embodiment, the second sidewall 72 is a semi-circular arc with a central angle of 180°. The semi-circular arc shape of the second sidewall 72 improves the connection strength between the second sidewall 72 and the first sidewall 71, while also allowing for a larger diameter of the liquid outlet, thus reducing the impact on injection efficiency.
[0033] Figure 6 A partial schematic diagram of the cover plate assembly, insulating plate, and shielding structure provided for another embodiment of this application, as shown below. Figure 6 To further increase the diameter of the injection hole 21 and ensure sufficient connection strength between the baffle 73 and the second sidewall 72, in one embodiment, the edge of the first sidewall 71 facing away from the insulating plate 3 includes a first edge 711 and a second edge 712. The first edge 711 is the edge where the first sidewall 71 and the second sidewall 72 are connected. The second edge 712 is the edge where the first sidewall 71 is not connected to the second sidewall 72. Along the direction perpendicular to the insulating plate 3, the distance D1 between the first edge 711 and the baffle 73 and the distance D2 between the second edge 712 and the baffle 73 satisfy: D1 < D2. This increases the diameter of the injection hole 21, thereby improving the injection efficiency.
[0034] In one embodiment, the injection hole 21 is projected entirely within the baffle 73. This allows the baffle 73 to effectively isolate the tab 6 from the cover assembly 2.
[0035] In one embodiment, the orthographic projection of the baffle 73 onto the cover plate assembly 2 is circular, and the diameter r of the orthographic projection satisfies: 1mm < r < 10mm. For example, the diameter r can specifically be 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, etc., and is not limited to these values. If the diameter r is too large, it will affect the liquid injection efficiency. If the diameter r is too small, the blocking effect will be poor. When the baffle 73 is arranged parallel to the insulating plate 3, the shape of the baffle 73 is circular and the same as the orthographic projection.
[0036] In some of the above embodiments, the baffle 73 may be arranged parallel to the insulating plate 3, and the baffle is circular. Figure 7 A partial schematic diagram of the cover plate assembly, insulating plate, and shielding structure provided for another embodiment of this application, as shown below. Figure 7 As shown, in another embodiment, the baffle 73 can also be elliptical, and the baffle 73 is not parallel to the insulating plate 3. In this embodiment, the baffle 73 can be inclined. The side of the baffle 73 away from the end A of the tab is lower than the side of the single plate 73 near the end A of the tab. This can block the tab 6 while also mitigating the impact of the electrolyte, making the connection between the baffle 73 and the second sidewall 72 reliable.
[0037] In other embodiments, the baffle 73 may also be other irregular structures, and this application does not impose specific limitations.
[0038] Please continue to refer to this. Figure 1 , Figure 4 or Figure 6 In one embodiment, the diameter of the edge where the first sidewall 71 connects to the insulating plate 3 is larger than the diameter of the injection hole 21. The first sidewall 71 is a hollow frustum, and the bottom of the frustum is connected to the insulating plate 3. The diameter of the bottom of the frustum is larger than the diameter of the injection hole 21. This can prevent the injection hole 21 from coinciding with the first sidewall 71 due to assembly tolerances or machining tolerances, thus avoiding the situation where the electrolyte is injected into the housing 1.
[0039] In one embodiment, the distance L between the baffle 73 and the injection hole 21 satisfies: 1mm < L < 8mm. For example, the value of distance L can be 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, etc., and is not limited to these values. Distance L satisfying the above range allows the shielding structure 7 to occupy less space within the housing 1, providing more space for the electrode tab 6.
[0040] In one embodiment, the thickness of the first sidewall 71 may be greater than the thickness of the second sidewall 72, and the second sidewall 72 may have the same thickness as the baffle 73.
[0041] Figure 8 A partial schematic diagram of the cover plate assembly, insulating plate, and shielding structure provided for another embodiment of this application, as shown below. Figure 8 As shown, in one embodiment, the cover plate assembly 2 has a boss 22 on the side facing the insulating plate 3, and the upper injection hole 21 is located on the boss 22. The boss 22 increases the thickness of the cover plate assembly 2 at the injection hole 21, thereby increasing the contact area between the sealing pin and the hole wall after the sealing pin is inserted into the injection hole 21, thus increasing the friction and making the connection between the sealing pin and the cover plate assembly 2 reliable. The outer wall of the boss 22 is spaced at a predetermined distance from the first side wall 71, which can prevent the injection hole 21 from coinciding with the first side wall 71 due to assembly tolerances or machining tolerances during assembly, thus avoiding the situation where the electrolyte injection into the housing 1 is affected.
[0042] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.
Claims
1. A battery, characterized in that, include: A housing having an opening; A cover assembly is disposed at the opening and closes with the housing to form a receiving space; The battery cell is disposed within the accommodating space; An insulating plate is stacked on top of the cover plate assembly and is located between the cover plate assembly and the battery cell; The pole post is disposed on the cover plate assembly; A tab is disposed inside the housing and located between the insulating plate and the battery cell. The tab extends from the end of the battery cell and is electrically connected to the electrode post. The cover plate assembly is provided with a liquid injection hole, and the insulating plate is provided with a shielding structure recessed into the battery cell at the position corresponding to the liquid injection hole. The shielding structure includes a first sidewall, a second sidewall, and a baffle. The second sidewall is connected between the first sidewall and the baffle, and the second sidewall is provided with at least one liquid outlet. The first sidewall is connected to the insulating plate and has an angle α with the insulating plate, and the angle α is an obtuse angle.
2. The battery according to claim 1, characterized in that, The included angle α is in the range of 110° < α < 160°.
3. The battery according to claim 2, characterized in that, The distance h between the battery cell and the insulating plate, and the included angle α, satisfy: 135mm° < h × α < 1250mm°.
4. The battery according to claim 1, characterized in that, The second sidewall is perpendicular to the insulating plate, and the orthographic projection of the second sidewall onto the cover plate assembly is an arc. The second sidewall is connected to the edge of the baffle, and the central angle β of the arc satisfies: 160° < β < 200°.
5. The battery according to claim 4, characterized in that, The distance h between the battery cell and the insulating plate, and the included angle α, satisfy: 130mm° < h × α < 1250mm°.
6. The battery according to claim 5, characterized in that, The central angle β of the arc is 180°.
7. The battery according to claim 1, characterized in that, The baffle is circular in the orthographic projection of the cover plate assembly, and the diameter r of the orthographic projection satisfies: 1mm < r < 10mm.
8. The battery according to claim 1, characterized in that, The injection hole is projected onto the baffle and is located entirely within the baffle.
9. The battery according to claim 1, characterized in that, The diameter of the edge where the first sidewall connects to the insulating plate is larger than the diameter of the injection hole.
10. The battery according to claim 1, characterized in that, The distance L between the baffle and the injection hole satisfies: 1mm < L < 8mm.
11. The battery according to claim 1, characterized in that, The thickness of the first sidewall is greater than the thickness of the second sidewall, and the thickness of the second sidewall is the same as that of the baffle.
12. The battery according to claim 1, characterized in that, The cover plate assembly has a boss on the side facing the insulating plate, the liquid injection hole is located on the boss, and the outer wall of the boss is spaced at a predetermined distance from the first side wall.