Battery cover plate structure and battery

Abstract

The utility model relates to the technical field of batteries, in particular to a battery cover plate structure and a battery, the battery cover plate structure is arranged at an opening end on one side of a battery core shell, and the battery cover plate structure comprises a cover plate, a cover plate bracket and a pole component; the cover plate bracket is arranged on one side of the cover plate, and the pole component is convexly arranged on the cover plate; the cover plate support comprises a pole mounting area and an explosion-proof valve mounting area which are arranged at an interval, and at least one pole assembly is arranged in the pole mounting area and is electrically insulated from the cover plate support; the thickness of the explosion-proof valve mounting area is greater than that of the pole mounting area; the positive tab and the negative tab of the battery cell are arranged on different battery cover plate structures, so that the hardness of the tabs after welding can be reduced, the tabs are convenient to bend, and the yield of the battery is improved; the thickness of the anti-explosion valve mounting area is greater than that of the pole mounting area, so that the anti-explosion valve mounting area can be propped against the battery cell, the battery cell arranged in the battery cell shell is positioned, and the battery cell mounting stability is realized.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery cover structure and a battery. Background Technology

[0002] With the increasing maturity of sodium-ion battery technology, sodium-ion batteries have been widely used. The cover structure of a sodium-ion battery is an important component of sodium-ion power batteries. It not only ensures the safety and reliability of the sodium-ion battery, but also facilitates the connection between the internal chemical system of the sodium-ion battery and the external module.

[0003] There are two types of cover plate structures for existing sodium-ion batteries. One type is set at both ends of the cell casing, with positive and negative tabs extending from both sides. This cover plate structure facilitates cell installation, but cell positioning is complex. The other type is set at one end of the cell casing, with positive and negative tabs extending from the same side. With the cover plate structure set on one side of the cell casing, a negative pressure is formed inside the casing during cell installation, affecting cell insertion and hindering cell installation. In addition, the positive and negative tabs of the cell are welded to the cover plate structure, and the thickness of the tab weld increases the hardness of the tab weld, making it difficult to bend when installing the cover plate structure at the casing port, increasing the installation difficulty. Utility Model Content

[0004] To address the aforementioned technical issues, this invention places the positive and negative tabs of the battery cell on different battery cover structures. Compared to welding both the positive and negative tabs to the same battery cover structure, this embodiment reduces the thickness of the tab welding, lowers the hardness of the tabs after welding, and facilitates bending during installation of the battery cover structure and the battery cell housing, thereby improving battery yield. More importantly, the thickness of the explosion-proof valve mounting area is greater than the thickness of the terminal post mounting area, which allows the explosion-proof valve mounting area to contact the battery cell, thereby achieving the positioning of the battery cell installed inside the battery cell housing and ensuring the stability of the battery cell installation.

[0005] This utility model provides a battery cover structure, which is disposed at one open end of the cell housing, including a cover plate, a cover plate bracket and at least one set of terminal post assemblies of the same polarity;

[0006] The cover plate bracket is disposed on one side of the cover plate, and one end of the at least one set of pole post assemblies passes through the cover plate bracket and the cover plate in sequence, and protrudes from the cover plate;

[0007] The cover plate support includes a pole mounting area and an explosion-proof valve mounting area that are spaced apart. The at least one pole assembly is disposed in the pole mounting area and is electrically insulated from the cover plate support.

[0008] The thickness of the explosion-proof valve mounting area is greater than the thickness of the pole mounting area.

[0009] Furthermore, the cover plate bracket is provided with a liquid injection installation area;

[0010] Along the length of the cover plate bracket, the liquid injection installation area, the electrode installation area, and the explosion-proof valve installation area are arranged sequentially, and the thickness of the liquid injection installation area is greater than the thickness of the electrode installation area.

[0011] Furthermore, the cover plate support satisfies at least one of the following characteristics:

[0012] The length of the explosion-proof valve installation area of ​​the cover plate bracket is 60-65mm;

[0013] The length of the liquid injection installation area of ​​the cover plate bracket is 40-45mm;

[0014] The width of the liquid injection installation area of ​​the cover plate bracket is 40-50mm;

[0015] The thickness of the liquid injection installation area of ​​the cover plate bracket is 2-6mm.

[0016] Furthermore, the liquid injection installation area of ​​the cover plate bracket and / or the explosion-proof valve installation area of ​​the cover plate bracket are provided with at least one weight reduction hole.

[0017] Furthermore, the weight-reducing hole satisfies at least one of the following characteristics:

[0018] The weight-reducing hole is at least one of a round hole, an elongated hole, a square hole, or an elliptical hole;

[0019] When the weight-reducing hole is a square hole, the length of the weight-reducing hole is 3.5-4.5mm;

[0020] When the weight-reducing hole is a square hole, the width of the weight-reducing hole is 3.0-4.0 mm.

[0021] Furthermore, the liquid injection installation area of ​​the cover plate bracket is provided with a liquid injection hole, and a screen structure is provided in the liquid injection hole.

[0022] Furthermore, the injection orifice satisfies at least one of the following characteristics:

[0023] The diameter of the injection hole is 5-10 mm;

[0024] The depth of the injection hole is 2-5 mm.

[0025] Furthermore, the thickness of the cover plate is 0.6-1.0 mm.

[0026] Furthermore, the cover plate is provided with an explosion-proof valve mounting hole, which is used to install an explosion-proof membrane and an explosion-proof valve. The explosion-proof membrane and the explosion-proof valve are respectively located at both ends of the explosion-proof valve mounting hole, and the explosion-proof valve is located close to the cover plate bracket.

[0027] The explosion-proof valve mounting area of ​​the cover plate bracket is provided with a through hole corresponding to the explosion-proof valve mounting hole, and the through hole can provide deformation space for the explosion-proof valve.

[0028] This utility model also protects a battery, including a cell housing and two sets of battery cover plate structures as described above;

[0029] The open end of the cell casing is connected to two sets of battery cover structures to form a sealed cavity, and the cell is placed in the sealed cavity.

[0030] Implementing the embodiments of this utility model has the following beneficial effects:

[0031] In this embodiment, the polarity of the terminal post assemblies on the battery cover structure is the same. This allows one of the positive and negative terminals of the battery cell to be electrically connected to the battery cover structure. By placing the positive and negative terminals on different battery cover structures, compared to welding both terminals to the same structure, this embodiment reduces the welding thickness and hardness of the terminals, facilitating bending during installation of the battery cover structure and the battery cell housing, thus improving battery yield. More importantly, the thickness of the explosion-proof valve mounting area is greater than that of the terminal post mounting area. This allows the explosion-proof valve mounting area to contact the battery cell, thereby stabilizing the battery cell within the housing and ensuring stable installation. Furthermore, the greater thickness of the explosion-proof valve mounting area increases the distance between the terminal post and the battery cell, preventing laser burn-through during welding of the battery cover structure and battery cell housing, thus improving battery safety. It also avoids short circuits caused by the connection between the terminal post and the battery cell, further enhancing battery safety. Attached Figure Description

[0032] To more clearly illustrate the technical solution of this utility model, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of this utility model. Those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0033] Figure 1 This is a structural diagram of the positive electrode battery cover plate structure described in this embodiment;

[0034] Figure 2This is a structural diagram of the negative electrode battery cover plate structure described in this embodiment;

[0035] Figure 3 This is a structural diagram of the battery cover structure as shown in the first angle of this embodiment;

[0036] Figure 4 This is a structural diagram of the battery cover structure as described in the second angle of this embodiment;

[0037] Figure 5 This is a structural diagram of the battery described in this embodiment.

[0038] The corresponding reference numerals in the figure are as follows:

[0039] 1-Cover plate; 2-Cover plate bracket; 3-Electrode post assembly; 4-Cell housing; 5-Explosion-proof membrane; 6-Explosion-proof valve; 11-Explosion-proof valve mounting hole; 21-Injection hole; 22-Weight reduction hole; 23-Through hole; 31-Terminal; 32-Upper sealing ring; 33-Sealing rubber; 34-Lower sealing ring; 35-Electrode rivet. Detailed Implementation

[0040] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0041] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0042] See appendix Figure 1-5 This embodiment provides a battery cover structure, which is disposed at one open end of the cell housing 4, including a cover plate 1, a cover plate bracket 2, and at least one set of terminal post assemblies 3 of the same polarity; the cover plate bracket 2 is disposed on one side of the cover plate 1, and one end of at least one set of terminal post assemblies 3 passes through the cover plate bracket 2 and the cover plate 1 in sequence and protrudes from the cover plate 1; the cover plate bracket 2 includes a terminal post mounting area and an explosion-proof valve 6 explosion-proof valve mounting area disposed at intervals, and at least one terminal post assembly 3 is disposed in the terminal post mounting area and is electrically insulated from the cover plate bracket 2; the thickness of the explosion-proof valve mounting area is greater than the thickness of the terminal post mounting area.

[0043] It should be noted that in this embodiment, the polarity of the electrode post assemblies 3 on the battery cover structure is the same. This allows one of the positive and negative electrodes of the battery cell to be electrically connected to the battery cover structure. In other words, the positive and negative electrodes of the battery cell are placed on different battery cover structures. Compared to welding both the positive and negative electrodes to the same battery cover structure, this embodiment reduces the electrode welding thickness and the hardness after welding, facilitating bending during installation of the battery cover structure and the battery cell housing 4, thereby improving battery yield. More importantly, the thickness of the explosion-proof valve installation area... The thickness of the electrode mounting area is greater than that of the terminal post mounting area. This allows the explosion-proof valve mounting area to contact the battery cell, thereby enabling the positioning of the battery cell within the battery cell housing 4 and ensuring the stability of the battery cell installation. Furthermore, the greater thickness of the explosion-proof valve mounting area compared to the terminal post mounting area increases the distance between the terminal post and the battery cell, preventing laser welding through the battery cell during the welding process of the battery cover structure and the battery cell housing, thus improving the battery's safety. It also prevents short circuits caused by the connection between the terminal post and the battery cell in the terminal post mounting area, further enhancing the battery's safety.

[0044] In this embodiment, the positive and negative tabs on the battery cell protrude from both ends of the battery cell. After the battery cell is placed inside the battery cell housing 4, the positive and negative tabs are electrically connected to the terminal post assemblies 3 on the battery cover plate structures at both ends of the battery cell housing 4. After the battery cell is electrically connected to the terminal post assemblies 3, the battery cover plate structures on both sides of the battery cell housing 4 are bent toward the opening ends on both sides of the battery cell housing 4, and the bent battery cover plate structures are welded and fixed to the opening ends on both sides of the battery cell housing 4, thereby realizing the preparation of the battery.

[0045] In this embodiment, the battery cover structure has pole assembly 3 with the same polarity, that is, one set of battery cover structures is provided with pole assembly 3 with positive polarity, and another set of battery cover structures is provided with pole assembly 3 with negative polarity.

[0046] In this embodiment, the cover plate bracket 2 is provided with a first pole mounting hole, the cover plate 1 is provided with a second pole mounting hole, and the cover plate 1 is also provided with a third pole mounting hole. The third pole mounting hole communicates with the second pole mounting hole. The pole assembly 3 includes a terminal 31, an upper sealing ring 32, a sealing rubber 33, a lower sealing ring 34, and an electrode rivet 35. The shapes of the third pole mounting hole, the sealing rubber 33, and the terminal 31 are adapted to each other. The sealing rubber 33 is disposed in the third pole mounting hole, and the terminal 31 is disposed in the sealing rubber 33, and the terminal 31 abuts against the inner wall of the sealing rubber 33. The upper sealing ring 32 and the lower sealing ring 34 are both sleeved on the electrode rivet 35. The lower sealing ring 34 is at least partially accommodated in the first pole mounting hole and the second pole mounting hole, so that the electrode rivet 35 is insulated from the cover plate bracket 2 and the cover plate 1.

[0047] In some possible embodiments, the cover plate bracket 2 is provided with a liquid injection installation area; along the length direction of the cover plate bracket 2, the liquid injection installation area, the electrode installation area, and the explosion-proof valve installation area are arranged sequentially, and the thickness of the liquid injection installation area is greater than the thickness of the electrode installation area. By setting the thickness of the liquid injection installation area to be greater than the thickness of the electrode installation area, it is possible to position both the left and right sides of the cell, further ensuring the stability of the cell installation and ensuring the distance between the left and right sides of the cell and the port of the cell housing 4. This can prevent laser welding through the cell during the welding process of the battery cover plate structure and the cell housing, thereby improving the safety of battery use.

[0048] In this embodiment, the explosion-proof valve mounting area and the liquid injection mounting area on the battery cover structure both protrude towards the battery cell. The distance between the liquid injection mounting area and the battery cell is the first distance, the distance between the terminal mounting area and the battery cell is the second distance, and the distance between the explosion-proof valve mounting area and the battery cell is the third distance. The first distance and the third distance are equal, and the first distance is greater than the second distance.

[0049] In this embodiment, by making the distance between the liquid injection installation area and the battery cell equal to the distance between the explosion-proof valve installation area and the battery cell, it can be ensured that the liquid injection installation area and the explosion-proof valve installation area respectively abut against the battery cell, thereby achieving stable positioning of the battery cell and ensuring the stability of the battery cell installation.

[0050] In this embodiment, the proportions of the areas occupied by the liquid injection installation area, the pole mounting area, and the explosion-proof valve installation area along the length of the cover plate bracket 2 are not limited, as long as the liquid injection installation area can be equipped with the liquid injection hole, the pole mounting area can be equipped with the pole assembly 3, and the explosion-proof valve installation area can be equipped with the explosion-proof valve 6.

[0051] In this embodiment, the pole mounting area is located in the middle region of the cover plate bracket 2, so that the poles located in the pole mounting area are located in the middle of the cover plate bracket 2.

[0052] Preferably, the length of the electrode mounting area is greater than the length of the explosion-proof valve mounting area, and the length of the explosion-proof valve mounting area is greater than the length of the liquid injection mounting area.

[0053] In some possible embodiments, the cover plate bracket 2 satisfies at least one of the following characteristics: the length of the explosion-proof valve mounting area of ​​the cover plate bracket 2 is 60-65mm; the length of the liquid injection mounting area of ​​the cover plate bracket 2 is 40-45mm; the width of the liquid injection mounting area of ​​the cover plate bracket 2 is 40-50mm; and the thickness of the liquid injection mounting area of ​​the cover plate bracket 2 is 2-6mm. By setting the above range, the mounting area of ​​the explosion-proof valve, the pole, and the liquid injection hole can be guaranteed, and the overall structure can be optimized.

[0054] In this embodiment, the length of the explosion-proof valve installation area of ​​the cover plate bracket 2 is 60-62mm, 60-65mm, 61-63mm, 61-65mm, 62-65mm, 63-65mm, or 64-65mm, etc.; the length of the liquid injection installation area of ​​the cover plate bracket 2 is 40-42mm, 40-45mm, 41-43mm, 41-45mm, 42-45mm, or 43-45mm, etc.; the width of the liquid injection installation area of ​​the cover plate bracket 2 is 40-45mm, 40-50mm, 43-45mm, 43-48mm, 43-50mm, or 45-50mm, etc.; and the thickness of the liquid injection installation area of ​​the cover plate bracket 2 is 2-6mm, 2-3mm, 2-6mm, 3-5mm, or 4-6mm, etc.

[0055] Preferably, the length of the explosion-proof valve installation area of ​​the cover plate bracket 2 is 65mm; the length of the liquid injection installation area of ​​the cover plate bracket 2 is 43mm; the width of the liquid injection installation area of ​​the cover plate bracket 2 is 45mm; and the thickness of the liquid injection installation area of ​​the cover plate bracket 2 is 4mm.

[0056] In some possible embodiments, the liquid injection installation area and / or the explosion-proof valve installation area of ​​the cover plate bracket 2 are provided with at least one weight reduction hole 22. By providing the weight reduction hole 22 while ensuring the strength of the cover plate bracket 2, the weight can be reduced and the manufacturing cost can be reduced.

[0057] In some possible embodiments, at least one weight reduction hole 22 is provided on the side of the cover plate support 2 facing the battery cell, or at least one weight reduction hole 22 is provided on the side of the cover plate support 2 away from the battery cell.

[0058] In this embodiment, at least one weight reduction hole 22 is provided on the side of the cover plate bracket 2 away from the battery cell, that is, at least one weight reduction hole 22 is provided on the side of the cover plate bracket 2 facing the cover plate 1.

[0059] In some possible embodiments, at least one weight-reducing hole 22 is provided on the side of the liquid injection mounting area of ​​the cover plate bracket 2 away from the battery cell, or at least one weight-reducing hole 22 is provided on the side of the explosion-proof valve mounting area of ​​the cover plate bracket 2 away from the battery cell, or at least one weight-reducing hole 22 is provided on both the side of the liquid injection mounting area of ​​the cover plate bracket 2 away from the battery cell and the side of the explosion-proof valve mounting area away from the battery cell.

[0060] Preferably, at least one weight-reducing hole 22 is provided on both the side of the liquid injection installation area away from the battery cell and the side of the explosion-proof valve installation area away from the battery cell of the cover plate bracket 2, and at least one weight-reducing hole 22 is arranged in an array.

[0061] In some possible embodiments, the weight-reducing hole 22 satisfies at least one of the following characteristics: the weight-reducing hole 22 is at least one of a round hole, an elongated hole, a square hole, or an elliptical hole; when the weight-reducing hole 22 is a square hole, the length of the weight-reducing hole 22 is 3.5-4.5 mm; when the weight-reducing hole 22 is a square hole, the width of the weight-reducing hole 22 is 3.0-4.0 mm. By limiting the weight-reducing hole as described above, the strength of the cover plate support 2 can be guaranteed while reducing the weight of the cover plate support 2.

[0062] In this embodiment, when the weight-reducing hole 22 is a square hole, the length of the weight-reducing hole 22 is 3.5-3.8mm, 3.5-4.0mm, 3.5-4.5mm, 3.8-4.5mm, or 4-4.5mm, etc.; when the weight-reducing hole 22 is a square hole, the width of the weight-reducing hole 22 is 3.0-4.0mm, 3.0-3.5mm, 3.0-3.8mm, 3.5-3.8mm, or 3.8-4.0mm, etc.

[0063] Preferably, the weight-reducing hole 22 is an elongated hole with a length of 3.88 mm and a width of 3.5 mm.

[0064] In some possible embodiments, the liquid injection mounting area of ​​the cover plate bracket 2 is provided with a liquid injection hole 21, and a screen structure is provided in the liquid injection hole 21. By providing a screen structure, foreign objects can be prevented from falling into the cell, thereby improving the safety of battery operation.

[0065] In this embodiment, the screen structure is detachably mounted on the inner wall of the injection hole 21, and the size of the screen structure is adapted to the size of the injection hole 21, which is not limited here.

[0066] In some possible embodiments, the injection hole 21 satisfies at least one of the following characteristics: the diameter of the injection hole 21 is 5-10 mm; the depth of the injection hole 21 is 2-5 mm. By setting the above range, it is possible to avoid the injection hole 21 being too large, which would weaken the strength of the injection installation area, and it is also possible to avoid the injection hole 21 being too small, which would reduce the injection capacity of the injection hole 21.

[0067] In this embodiment, the diameter of the injection hole 21 is 5-8mm, 5-10mm, 6-8mm, 6-10mm, 8-10mm or 9-10mm, etc.; the depth of the injection hole 21 is 2-3mm, 2-4mm, 2-5mm, 3-4mm, 3-5mm or 4-5mm, etc.

[0068] In this embodiment, a sealing pin is provided in the injection hole 21 to seal the injection hole 21. By setting a screen structure and sealing pin that cooperate with each other, it is possible to prevent the sealing pin from extending too deep into the injection hole 21, which would make the sealing pin impossible to remove.

[0069] In some possible embodiments, the thickness of the cover plate 1 is 0.6-1.0 mm. By setting the thickness of the cover plate 1 to the above range, the strength of the cover plate 1 can be guaranteed, while ensuring that the cover plate 1 has enough space to install the explosion-proof valve.

[0070] In this embodiment, the thickness of the cover plate 1 is 0.6-0.8mm, 0.6-1.0mm, 0.8-0.9mm, 0.8-1.0mm or 0.9-1.0mm, etc.

[0071] Preferably, the thickness of the cover plate 1 is 0.8 mm.

[0072] In some possible embodiments, the cover plate 1 is provided with an explosion-proof valve mounting hole 11, which is used to install the explosion-proof membrane 5 and the explosion-proof valve 6. The explosion-proof membrane 5 and the explosion-proof valve 6 are respectively located at both ends of the explosion-proof valve mounting hole 11, and the explosion-proof valve 6 is located close to the cover plate bracket 2. The explosion-proof valve mounting area of ​​the cover plate bracket 2 is provided with a through hole 23 corresponding to the explosion-proof valve mounting hole 11. The through hole 23 can provide deformation space for the explosion-proof valve 6. By providing the explosion-proof valve mounting hole 11, it is convenient to install the explosion-proof membrane 5 and the explosion-proof valve 6. By providing the through hole 23, it is possible to provide deformation space for the explosion-proof valve 6, thereby ensuring the explosion-proof effect of the explosion-proof valve 6.

[0073] In this embodiment, an explosion-proof membrane 5 and an explosion-proof valve 6 are provided in the explosion-proof valve mounting hole 11. The explosion-proof membrane 5 and the explosion-proof valve 6 are respectively provided at both ends of the explosion-proof valve mounting hole 11, and there is a gap between the explosion-proof membrane 5 and the explosion-proof valve 6.

[0074] In this embodiment, the shape of the through hole 23 is adapted to the shape of the explosion-proof valve mounting hole 11, and the size of the through hole 23 is also adapted to the size of the explosion-proof valve mounting hole 11.

[0075] Preferably, the explosion-proof valve mounting hole 11 is an elongated hole.

[0076] This utility model also protects a battery, including a cell housing 4 and two sets of battery cover plate structures as described above; the open ends of the cell housing 4 are respectively connected to the two sets of battery cover plate structures to form a sealed cavity, and the cell is placed in the sealed cavity. In this embodiment, the battery includes the battery cover plate structures as described above, and the polarity of the electrode post assemblies 3 provided on the battery cover plate structures is the same. This enables one of the positive and negative electrodes of the cell to be electrically connected to the battery cover plate structure, that is, the positive and negative electrodes of the cell are placed on different battery cover plate structures. Compared with the positive and negative electrodes being welded to the same battery cover plate structure, this embodiment can reduce the electrode welding thickness and reduce the hardness of the electrode after welding, making it easier to bend the battery cover plate structure and the cell housing 4 during installation, thereby improving the battery yield. More importantly, the two sets of battery cover plate structures are respectively set on both sides of the cell housing 4. During the cell installation process, the two ends of the cell housing 4 have openings, so that negative pressure will not be formed inside the cell housing 4, thus not affecting the cell insertion into the housing, thereby ensuring the cell installation.

[0077] In this embodiment, the battery cover structure is used to install on the open end of the cell housing 4 to achieve sealing of the cell housing 4; the cell housing 4 in this embodiment has open ends at opposite ends, and two sets of battery cover structures are respectively set on the open ends of the cell housing 4. One set of battery cover structures is provided with a positive polarity terminal post assembly 3, and the other set of battery cover structures is provided with a negative polarity terminal post assembly 3.

[0078] In this embodiment, the cell housing 4 and the battery cover structure are side-welded to achieve a fixed connection between the cell housing 4 and the battery cover structure. At the same time, the two are fixed by side welding, and the explosion-proof valve installation area and the liquid injection installation area are both protruding towards the cell, which can prevent laser welding from damaging the cell and thus improve the safety of battery use.

[0079] Battery installation process: Place the battery cell with tabs at both ends into the battery cell housing 4. Weld the terminal post assembly 3 on one set of battery cover plate structure to the tab on one side of the battery cell using an adapter piece. Weld the technical assembly 3 on another set of battery cover plate structure to the tab on the other side of the battery cell using an adapter piece. Bend the battery cover plate structures on both sides of the battery cell housing 4 toward the opening ends on both sides of the battery cell housing 4, and weld the bent battery cover plate structures to the opening ends on both sides of the battery cell housing 4 to achieve battery fabrication.

[0080] Example 1

[0081] See appendix Figure 1-5This embodiment provides a battery cover structure, which is provided at one open end of the cell housing 4, including a cover plate 1, a cover plate bracket 2 and at least one set of terminal post assemblies 3 of the same polarity; the cover plate bracket 2 is provided on one side of the cover plate 1, and one end of the at least one set of terminal post assemblies 3 passes through the cover plate bracket 2 and the cover plate 1 in sequence, protrudes on the cover plate 1, and is electrically insulated from the cover plate bracket 2.

[0082] In this embodiment, the battery cover structure has pole assembly 3 with the same polarity, that is, one set of battery cover structures is provided with pole assembly 3 with positive polarity, and another set of battery cover structures is provided with pole assembly 3 with negative polarity.

[0083] In this embodiment, the cover plate bracket 2 is provided with a first pole mounting hole, the cover plate 1 is provided with a second pole mounting hole, and the cover plate 1 is also provided with a third pole mounting hole. The third pole mounting hole communicates with the second pole mounting hole. The pole assembly 3 includes a terminal 31, an upper sealing ring 32, a sealing rubber 33, a lower sealing ring 34, and an electrode rivet 35. The shapes of the third pole mounting hole, the sealing rubber 33, and the terminal 31 are adapted to each other. The sealing rubber 33 is disposed in the third pole mounting hole, and the terminal 31 is disposed in the sealing rubber 33, and the terminal 31 abuts against the inner wall of the sealing rubber 33. The upper sealing ring 32 and the lower sealing ring 34 are both sleeved on the electrode rivet 35. The lower sealing ring 34 is at least partially accommodated in the first pole mounting hole and the second pole mounting hole, so that the electrode rivet 35 is insulated from the cover plate bracket 2 and the cover plate 1.

[0084] In this embodiment, the cover plate bracket 2 includes an injection installation area, an electrode installation area, and an explosion-proof valve 6 installation area, which are spaced apart. Along the length of the cover plate bracket 2, the injection installation area, the electrode installation area, and the explosion-proof valve installation area are arranged sequentially, and the thickness of the explosion-proof valve installation area is greater than the thickness of the electrode installation area, and the thickness of the injection installation area is greater than the thickness of the electrode installation area; at least one electrode assembly 3 is disposed in the electrode installation area and is electrically insulated from the cover plate bracket 2.

[0085] In this embodiment, the explosion-proof valve mounting area and the liquid injection mounting area on the battery cover structure both protrude towards the battery cell. The distance between the liquid injection mounting area and the battery cell is a first distance, the distance between the terminal mounting area and the battery cell is a second distance, and the distance between the explosion-proof valve mounting area and the battery cell is a third distance. The first distance is greater than the second distance, and the first distance and the third distance are equal, that is, the distance between the liquid injection mounting area and the battery cell is equal to the distance between the explosion-proof valve mounting area and the battery cell.

[0086] In this embodiment, the proportions of the areas occupied by the liquid injection installation area, the pole mounting area, and the explosion-proof valve installation area along the length of the cover plate bracket 2 are not limited, as long as the liquid injection installation area can be equipped with the liquid injection hole, the pole mounting area can be equipped with the pole assembly 3, and the explosion-proof valve installation area can be equipped with the explosion-proof valve 6.

[0087] In this embodiment, the pole mounting area is located in the middle region of the cover plate bracket 2, so that the poles located in the pole mounting area are located in the middle of the cover plate bracket 2.

[0088] Preferably, the length of the electrode mounting area is greater than the length of the explosion-proof valve mounting area, and the length of the explosion-proof valve mounting area is greater than the length of the liquid injection mounting area.

[0089] In this embodiment, the cover plate bracket 2 satisfies at least one of the following characteristics: the length of the explosion-proof valve mounting area of ​​the cover plate bracket 2 is 60-65mm; the length of the liquid injection mounting area of ​​the cover plate bracket 2 is 40-45mm; the width of the liquid injection mounting area of ​​the cover plate bracket 2 is 40-50mm; and the thickness of the liquid injection mounting area of ​​the cover plate bracket 2 is 2-6mm.

[0090] Preferably, the length of the explosion-proof valve installation area of ​​the cover plate bracket 2 is 65mm; the length of the liquid injection installation area of ​​the cover plate bracket 2 is 43mm; the width of the liquid injection installation area of ​​the cover plate bracket 2 is 45mm; and the thickness of the liquid injection installation area of ​​the cover plate bracket 2 is 4mm.

[0091] In this embodiment, the liquid injection installation area of ​​the cover plate bracket 2 and / or the explosion-proof valve installation area of ​​the cover plate bracket 2 are provided with at least one weight reduction hole 22.

[0092] Preferably, at least one weight-reducing hole 22 is provided on both the side of the liquid injection installation area away from the battery cell and the side of the explosion-proof valve installation area away from the battery cell of the cover plate bracket 2, and at least one weight-reducing hole 22 is arranged in an array.

[0093] In this embodiment, the weight-reducing hole 22 satisfies at least one of the following characteristics: the weight-reducing hole 22 is at least one of a round hole, an elongated hole, a square hole, or an elliptical hole; when the weight-reducing hole 22 is a square hole, the length of the weight-reducing hole 22 is 3.5-4.5 mm; when the weight-reducing hole 22 is a square hole, the width of the weight-reducing hole 22 is 3.0-4.0 mm.

[0094] Preferably, the weight-reducing hole 22 is an elongated hole with a length of 3.88 mm and a width of 3.5 mm.

[0095] In this embodiment, the liquid injection installation area of ​​the cover plate bracket 2 is provided with a liquid injection hole 21, and a screen structure is provided in the liquid injection hole 21.

[0096] In this embodiment, the screen structure is detachably mounted on the inner wall of the injection hole 21, and the size of the screen structure is adapted to the size of the injection hole 21, which is not limited here.

[0097] In this embodiment, the injection hole 21 satisfies at least one of the following characteristics: the diameter of the injection hole 21 is 5-10 mm; the depth of the injection hole 21 is 2-5 mm.

[0098] In this embodiment, a sealing pin is provided in the injection hole 21 to seal the injection hole 21. By setting a screen structure and sealing pin that cooperate with each other, it is possible to prevent the sealing pin from extending too deep into the injection hole 21, which would make the sealing pin impossible to remove.

[0099] In this embodiment, the thickness of the cover plate 1 is 0.6-1.0 mm.

[0100] Preferably, the thickness of the cover plate 1 is 0.8 mm.

[0101] In this embodiment, the cover plate 1 is provided with an explosion-proof valve mounting hole 11, which is used to install the explosion-proof membrane 5 and the explosion-proof valve 6. The explosion-proof membrane 5 and the explosion-proof valve 6 are respectively located at both ends of the explosion-proof valve mounting hole 11, and the explosion-proof valve 6 is located close to the cover plate bracket 2. The explosion-proof valve mounting area of ​​the cover plate bracket 2 is provided with a through hole 23 corresponding to the explosion-proof valve mounting hole 11. The through hole 23 can provide deformation space for the explosion-proof valve 6.

[0102] In this embodiment, an explosion-proof membrane 5 and an explosion-proof valve 6 are provided in the explosion-proof valve mounting hole 11. The explosion-proof membrane 5 and the explosion-proof valve 6 are respectively provided at both ends of the explosion-proof valve mounting hole 11, and there is a gap between the explosion-proof membrane 5 and the explosion-proof valve 6.

[0103] In this embodiment, the shape of the through hole 23 is adapted to the shape of the explosion-proof valve mounting hole 11, and the size of the through hole 23 is also adapted to the size of the explosion-proof valve mounting hole 11.

[0104] Preferably, the explosion-proof valve mounting hole 11 is an elongated hole.

[0105] Although the present invention has been described through preferred embodiments, the present invention is not limited to the embodiments described herein, and includes various changes and variations without departing from the scope of the present invention.

[0106] In this document, the directional terms such as front, back, top, and bottom are defined according to the positions of the components in the accompanying drawings and the positions between the components, and are only used for clarity and convenience in expressing the technical solution. It should be understood that the use of these directional terms should not limit the scope of protection claimed by this utility model.

[0107] Where there is no conflict, the above embodiments and features described herein can be combined with each other.

[0108] The above-disclosed embodiment is merely a preferred embodiment of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A battery cover structure, disposed at an opening on one side of a cell housing (4), characterized in that, Includes a cover plate (1), a cover plate support (2), and at least one set of pole post assemblies (3) of the same polarity; The cover plate bracket (2) is disposed on one side of the cover plate (1), and one end of the at least one set of pole post assemblies (3) passes through the cover plate bracket (2) and the cover plate (1) in sequence and protrudes from the cover plate (1); The cover plate bracket (2) includes a pole post mounting area and an explosion-proof valve (6) explosion-proof valve mounting area spaced apart. The at least one pole post assembly (3) is disposed in the pole post mounting area and is electrically insulated from the cover plate bracket (2). The thickness of the explosion-proof valve mounting area is greater than the thickness of the pole mounting area.

2. The battery cover structure according to claim 1, characterized in that, The cover plate bracket (2) is provided with a liquid injection installation area; Along the length of the cover plate bracket (2), the liquid injection installation area, the pole installation area and the explosion-proof valve installation area are arranged in sequence, and the thickness of the liquid injection installation area is greater than the thickness of the pole installation area.

3. The battery cover structure according to claim 1, characterized in that, The cover plate support (2) satisfies at least one of the following characteristics: The length of the explosion-proof valve installation area of ​​the cover plate bracket (2) is 60-65mm; The length of the liquid injection installation area of ​​the cover plate bracket (2) is 40-45mm; The width of the liquid injection installation area of ​​the cover plate bracket (2) is 40-50mm; The thickness of the liquid injection installation area of ​​the cover plate bracket (2) is 2-6mm.

4. The battery cover structure according to claim 2, characterized in that, The liquid injection installation area of ​​the cover plate bracket (2) and / or the explosion-proof valve installation area of ​​the cover plate bracket (2) are provided with at least one weight reduction hole (22).

5. The battery cover structure according to claim 4, characterized in that, The weight-reducing hole (22) satisfies at least one of the following characteristics: The weight-reducing hole (22) is at least one of a round hole, an elongated hole, a square hole, or an elliptical hole; When the weight-reducing hole (22) is a square hole, the length of the weight-reducing hole (22) is 3.5-4.5mm; When the weight-reducing hole (22) is a square hole, the width of the weight-reducing hole (22) is 3.0-4.0 mm.

6. The battery cover structure according to any one of claims 1-5, characterized in that, The cover plate bracket (2) has an injection hole (21) on its injection installation area, and a screen structure is provided in the injection hole (21).

7. The battery cover structure according to claim 6, characterized in that, The injection port (21) satisfies at least one of the following characteristics: The diameter of the injection hole (21) is 5-10 mm; The depth of the injection hole (21) is 2-5 mm.

8. The battery cover structure according to any one of claims 1-5, characterized in that, The thickness of the cover plate (1) is 0.6-1.0 mm.

9. The battery cover structure according to any one of claims 1-5, characterized in that, The cover plate (1) is provided with an explosion-proof valve mounting hole (11), which is used to install an explosion-proof membrane (5) and an explosion-proof valve (6). The explosion-proof membrane (5) and the explosion-proof valve (6) are respectively located at both ends of the explosion-proof valve mounting hole (11), and the explosion-proof valve (6) is located close to the cover plate bracket (2). The explosion-proof valve mounting area of ​​the cover plate bracket (2) is provided with a through hole (23) corresponding to the explosion-proof valve mounting hole (11), and the through hole (23) can provide deformation space for the explosion-proof valve (6).

10. A battery, characterized in that, Includes a cell housing (4) and two sets of battery cover structures as described in any one of claims 1-9; The open end of the cell housing (4) is connected to two sets of battery cover structures to form a sealed cavity, and the cell is placed in the sealed cavity.

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