Battery cover plate and battery

Abstract

The utility model discloses a battery cover plate and a battery, and the battery cover plate comprises a substrate which is provided with a substrate outer side and a substrate inner side which are oppositely arranged along the thickness direction; the two polar columns are respectively arranged on the substrate in an insulating and penetrating manner, a groove is formed in one end, protruding out of the inner side of the substrate, of each polar column along the axial direction, and a welding area is arranged at the other end, protruding out of the outer side of the substrate, of each polar column along the axial direction; one end, protruding out of the inner side of the base plate, of each pole column is attached with one connecting piece, a protruding part matched with the groove is integrally formed on each connecting piece, the protruding parts are assembled in the grooves, and the protruding parts and the pole columns are welded together in a welding area through laser breakdown of the tops of the pole columns. Therefore, by changing the layout of the welding points between the connecting piece and the substrate, the problem of potential safety hazards caused by the fact that aluminum skimmings and welding slag remain on the inner side of the substrate in the welding operation of the connecting piece is completely eradicated, the safety and the battery performance are improved, and the service life of the battery is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery cover and a battery. Background Art

[0002] At present, the manufacture of aluminum shell batteries generally relies on lamination or winding technology to produce bare battery cell electrode groups. Subsequently, the battery cell tabs of these electrode groups are welded together with hard connection components through ultrasonic welding technology, and then the welding area reserved on the hard connection component is laser welded to the inner side of the cover to ensure the stability of the structure.

[0003] However, the welding process between the above-mentioned hard connection components (connectors) and the cover plate occurs on the inside of the cover plate. This welding process will cause aluminum chips to splash and welding slag residue to remain on the inside of the cover plate, and these aluminum chips and welding slag are difficult to be completely removed immediately. In the subsequent battery filling stage, these residual aluminum chips and welding slag will flow freely inside the battery cell with the electrolyte, causing large battery self-discharge, short circuit, shortened life, etc., posing a safety hazard and affecting battery performance and service life. Utility Model Content

[0004] The utility model aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, the first purpose of the present invention is to propose a battery cover plate, which eliminates the safety hazard caused by aluminum chips and welding slag remaining on the inner side of the substrate during the welding operation of the connector by changing the layout of the welding points between the connector and the substrate, thereby improving the safety as well as the battery performance and service life.

[0006] The second purpose of the present invention is to provide a battery.

[0007] To achieve the above-mentioned purpose, the present invention proposes a battery cover, comprising: a substrate, the substrate having an outer side and an inner side of the substrate arranged opposite to each other along the thickness direction; two poles, the two poles are respectively insulated and penetrated through the substrate, a groove is axially provided on one end of the pole protruding from the inner side of the substrate, and a welding area is axially provided on the other end of the pole protruding from the outer side of the substrate; two connecting pieces, each of the poles is fitted with one connecting piece on one end protruding from the inner side of the substrate, a protrusion adapted to the groove is integrally formed on the connecting piece, and the protrusion is assembled in the groove, and the protrusion is welded to the pole in the welding area by laser piercing through the top of the pole.

[0008] The battery cover of the present invention, when fixing the connector and the pole, fits the raised portion of the connector into the groove to ensure a close fit and preliminary positioning between the two, and then uses an external laser device to instantly penetrate the top of the pole in the welding area with a laser to firmly weld the raised portion and the pole together, thereby leaving aluminum chips and welding slag in the welding process on the outside of the substrate, that is, leaving the aluminum chips and welding slag on the side of the substrate away from the shell, that is, on the outside of the battery shell, fundamentally solving the problem of aluminum chips and welding slag easily remaining on the inside of the cover in traditional welding methods, which may cause safety hazards. By changing the structure between the connector and the pole to adjust the layout of the welding points between the connector and the substrate, the layout of the welding points between the connector and the substrate eliminates the safety hazards caused by aluminum chips and welding slag remaining on the inside of the substrate during the welding operation of the connector, helps to keep the internal structure of the battery clean and stable, thereby optimizing the performance of the battery and extending its service life.

[0009] In addition, the battery cover proposed in the application may also have the following additional technical features:

[0010] Specifically, the welding area is recessed from the outer side of the substrate toward the inner side of the substrate, and the depth of the recess is 1.5-2 mm.

[0011] Specifically, the pole is insulated and connected to the substrate through an injection molded part.

[0012] Specifically, two through holes are provided on the substrate along the length direction, and the two poles are respectively passed through the corresponding through holes and are arranged with a gap between them.

[0013] The injection molded part is arranged on the substrate, is coaxially arranged with the through hole, and covers the outer wall of the pole protruding from the outside of the substrate, so as to insulate and connect the pole and the substrate together.

[0014] Specifically, a sealing ring is further included, and the sealing ring is sealingly arranged between the pole and the through hole.

[0015] Specifically, the outer circles of one end of the pole and the sealing ring protruding from the inner side of the substrate are respectively turned outward to form flanges, and the flanges of the pole press the flanges of the sealing ring to fit onto the inner side of the substrate.

[0016] Specifically, it further includes a lower plastic part, which is arranged between the base plate and the connecting part, and the lower plastic part is riveted to the base plate.

[0017] Specifically, a first boss and a second boss protruding in a direction away from the substrate are integrally formed on a side of the lower plastic component away from the substrate.

[0018] Specifically, it also includes an explosion-proof valve, wherein a pressure relief port is opened on the substrate along the thickness direction, the pressure relief port is connected to the cavity provided inside the second boss, and a plurality of leakage holes are opened on the side of the second boss away from the substrate, and the explosion-proof valve is arranged in the pressure relief port.

[0019] To achieve the above-mentioned objectives, the second embodiment of the present invention proposes a battery, comprising a battery shell, a battery cell, an electrolyte and the above-mentioned battery cover, wherein an opening is opened on the battery shell, the battery cell can be accommodated and fixed in the inner cavity of the battery shell along the opening, the battery cover can be sealed and fixed to the opening, and the electrolyte can be injected into the battery shell after assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present invention, and together with the description, serve to explain the principles of the present invention.

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0022] Figure 1 This is a schematic structural diagram of a battery cover according to one embodiment of the present utility model;

[0023] Figure 2 The figure is a schematic top view of the battery cover according to one embodiment of the present invention.

[0024] As shown in the figure: 1. Base plate; 2. Pole; 3. Injection molded part; 4. Connector; 5. Lower plastic part; 6. Explosion-proof valve; 7. Sealing ring; 10. Through hole; 11. Outside of base plate; 12. Inside of base plate; 13. Pressure relief port; 20. Groove; 21. Welding area; 50. First boss; 51. Second boss. DETAILED DESCRIPTION

[0025] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the scheme of the present invention will be further described below. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0026] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present invention, rather than all of the embodiments.

[0027] The battery cover and the battery according to the embodiment of the present invention are described below with reference to the accompanying drawings.

[0028] The battery cover provided in the embodiment of the present utility model can be applied to a battery casing to seal the opening of the battery casing.

[0029] like Figure 1 and Figure 2 As shown, the battery cover of the first embodiment of the present invention may include a base plate 1 , two poles 2 , and two connectors 4 .

[0030] The substrate 1 has a substrate outer side 11 and a substrate inner side 12 arranged opposite to each other along the thickness direction.

[0031] It should be noted that the outer side 11 of the substrate described in this embodiment refers to the side of the substrate 1 away from the battery housing, while the inner side 12 of the substrate refers to the side of the substrate 1 close to the battery housing.

[0032] In addition, refer to Figure 2 The substrate 1 is also provided with a liquid injection hole, which is used to inject liquid into the assembled battery shell through the liquid injection hole when the battery cover is encapsulated on the battery shell, and a sealing plug can also be provided on the liquid injection hole, which can quickly and effectively seal the liquid injection hole after the liquid injection operation is completed.

[0033] The two poles 2 are insulated and respectively penetrate the substrate 1. A groove 20 is axially provided on one end of the pole 2 protruding from the inner side 12 of the substrate, and a welding area 21 is axially provided on the other end of the pole 2 protruding from the outer side 11 of the substrate. One pole 2 is a positive pole and the other pole 2 is a negative pole.

[0034] A connector 4 is attached to one end of each pole 2 protruding from the inner side 12 of the substrate, and a protrusion that is compatible with the groove 20 is integrally formed on the connector 4, and the protrusion is assembled in the groove 20, and the protrusion is welded to the pole 2 in the welding area 21 by laser penetration of the top of the pole 2. The two connectors 4 are divided into a positive connector and a negative connector, and the positive connector corresponds to the positive pole, and the negative pole corresponds to the negative connector. The positive connector and the negative connector are electrically connected to the positive ear and the negative ear of the battery cell respectively to ensure that the battery cell can perform normal charging and discharging operations. The material of the connector 4 is aluminum.

[0035] As a possible scenario, see Figure 2To better distinguish the two terminals 2 (positive and negative), clear positive and negative terminal markers (+ and -) are provided on the base plate 1 and placed adjacent to the corresponding terminals 2. This design greatly improves the convenience of the battery cover during use and maintenance, allowing personnel to quickly and accurately identify the positive and negative terminals, avoiding safety hazards and performance losses caused by misconnection.

[0036] Specifically, when the connector 4 is fixed to the pole 2, the raised portion of the connector 4 is assembled into the groove 20 to ensure a close fit and preliminary positioning between the two. Then, an external laser device is used to instantly penetrate the top of the pole 2 in the welding area 21 by laser to firmly weld the raised portion to the pole 2, thereby leaving the aluminum chips and welding slag in the welding process on the outside 11 of the substrate, that is, leaving the aluminum chips and welding slag on the side of the substrate 1 away from the shell, that is, leaving them outside the battery shell, fundamentally solving the problem that aluminum chips and welding slag are easily left on the inside of the cover plate in traditional welding methods, which may cause safety hazards.

[0037] By changing the structure between the connector 4 and the pole 2, the layout of the welding points between the connector 4 and the substrate 1 and the layout of the welding points between the connector 4 and the pole 2 are adjusted, thereby eliminating the safety hazard caused by aluminum chips and welding slag remaining on the inner side 12 of the substrate during the welding operation of the connector 4, helping to keep the internal structure of the battery clean and stable, thereby optimizing the performance of the battery and extending its service life.

[0038] Furthermore, if Figure 1 As shown, the welding area 21 is recessed from the outer side 11 of the substrate to the inner side 12 of the substrate, and the recess depth is 1.5-2 mm. The above setting can reduce the thickness of the interlayer between the welding area 21 and the groove 20, and its energy attenuation path is shortened, thereby facilitating the laser to quickly penetrate the top of the pole 2 and weld to the raised portion below. The thinner interlayer thickness is conducive to the efficient transmission of laser energy, reducing heat loss and energy dissipation during welding, ensuring the strength and sealing of the welded joint, and further improving the welding quality.

[0039] At the same time, the downward concave design of the welding area 21 can also provide positioning of the welding point during welding, making the laser welding operation easier and reducing the difficulty of welding. It can also collect aluminum chips and welding slag, effectively reducing the splashing of aluminum chips and welding slag generated during the welding process and improving safety.

[0040] In one embodiment of the present invention, Figure 1As shown, the battery cover further includes a sealing ring 7, which is sealed between the pole 2 and the through hole 10, wherein the sealing ring 7 can be made of rubber, which can effectively fill the small gap between the pole 2 and the through hole 10, and prevent the gas, liquid or other media inside the battery from leaking to the outside, and also prevent external impurities such as moisture, dust, etc. from entering the battery, thereby significantly improving the overall sealing performance of the battery, and can effectively avoid safety hazards such as short circuit and fire caused by leakage of internal battery substances, thereby improving the safety and reliability of the battery. In addition, when the pole 2 is installed in the through hole 10, and before the injection molding part 3 is injection-molded, the pole 2 can be initially positioned and fixed, thereby fixing the pole 2 in the through hole 10.

[0041] Further, if Figure 1 As shown, the outer circles of one end of the pole 2 and the sealing ring 7 protruding from the inner side of the substrate 1 are turned outward to form flanges, and the flange of the pole 2 presses the flange of the sealing ring 7 to fit on the inner side 12 of the substrate.

[0042] Among them, it can be understood that the flange of the pole 2 squeezes the flange of the sealing ring 7 tightly onto the inner side 12 of the substrate, forming a more stable sealing structure. This structure can more effectively prevent the gas, liquid or other impurities inside the battery from leaking out through the tiny gap between the pole 2 and the substrate 1, thereby significantly improving the sealing performance of the battery. In addition, the flange design also increases the contact area between the pole 2 and the sealing ring 7 and the substrate 1, making the connection between them more firm, and can better resist adverse factors such as wear and aging during long-term use, reducing the risk of sealing failure due to loosening or falling off, thereby extending the service life of the battery system.

[0043] In one embodiment of the present invention, Figure 1 As shown, the pole 2 is insulated and connected to the base plate 1 via the injection molded part 3 .

[0044] Among them, the injection molded part 3 is an insulating material, and its material can be PPS (Polyphenylene sulfide), which can effectively isolate the electrical conduction between the pole 2 and the substrate 1, and prevent the current from flowing in an unintended path, thereby improving the insulation performance of the battery system and enhancing the safety. It can also form a stable mechanical structure through the close combination between the injection molded part 3, the pole 2 and the substrate 1.

[0045] Further, if Figure 1As shown, two through holes 10 are arranged at intervals along the length direction of the substrate 1, and two poles 2 are respectively provided in the corresponding through holes 10 and arranged with a gap between the through holes 10. The injection molded part 3 is provided on the substrate 1, and the injection molded part 3 is arranged coaxially with the through hole 10. The injection molded part 3 is covered on the outer wall of the pole 2 protruding from the outer side 11 of the substrate, so as to be used to insulate the pole 2 and the substrate 1 together.

[0046] Specifically, the sealing ring 7 is sleeved on the outer wall of the pole 2. After the sleeve connection is completed, the pole 2 with the sealing ring 7 is clamped in the through hole 10, and the elasticity of the sealing ring 7 is used to fix the pole 2 in the through hole 10. Then, the injection molded part 3 is covered on the outer wall of the pole 2 by injection molding to fix the pole 2, and the injection molded part 3 is covered on the part of the pole 2 protruding from the outside 11 of the substrate, forming an effective insulation barrier to ensure electrical isolation between the pole 2 and the substrate 1. In addition, the injection molded part 3 can tightly fill the gap between the pole 2 and the through hole 10 during the injection molding process to form a sealing layer to prevent external moisture, dust and other impurities from entering the battery.

[0047] In one embodiment of the present invention, Figure 1 As shown, the battery cover further includes a lower plastic part 5, which is arranged between the substrate 1 and the connector 4, and is riveted to the substrate 1. The lower plastic part 5 can separate the substrate 1 and the battery cell, so as to insulate the battery cell from the substrate 1 and improve safety. At the same time, the lower plastic part 5 serves as an intermediate layer between the substrate 1 and the connector 4, and is tightly connected to the substrate 1 by riveting, which can also significantly improve the overall structural strength of the substrate 1.

[0048] Further, if Figure 1 As shown, a first boss 50 and a second boss 51 protruding in a direction away from the substrate 1 are integrally formed on a side of the lower plastic component 5 away from the substrate 1 .

[0049] It should be noted that the first boss 50 and the second boss 51 described in this embodiment have the same protruding height. The first boss 50 and the second boss 51 are used to support the battery cells in the external battery casing, effectively preventing the battery cells from moving or shaking in the battery casing.

[0050] Furthermore, without affecting the limiting function, cavities can be provided inside the first boss 50 and the second boss 51 to reduce the material usage of the first boss 50 and the second boss 51, thereby achieving a lightweight structure and reducing production costs.

[0051] In one embodiment of the present invention, Figure 1As shown, the battery housing further includes an explosion-proof valve 6, wherein a pressure relief port 13 is provided on the substrate 1 along the thickness direction, the pressure relief port 13 is communicated with the cavity provided inside the second boss 51, and a plurality of leakage holes are provided on the side of the second boss 51 away from the substrate 1, and the explosion-proof valve 6 is arranged in the pressure relief port 13.

[0052] Specifically, when high-temperature and high-pressure gases are generated inside the battery due to overcharging, short circuit, etc., these gases will enter the pressure relief port 13 through the leak hole. As the pressure continues to increase, the explosion-proof valve 6 will be unable to withstand the pressure and will rupture and open to relieve pressure, allowing the gas to be discharged quickly, thereby avoiding the risk of explosion caused by excessive pressure inside the battery. Among them, the explosion-proof valve 6 may include an explosion-proof piece and a protective film. The explosion-proof piece is fixed in the pressure relief port 13, and the protective film is wrapped above the explosion-proof piece. The protective film is used to protect the explosion-proof piece, and the explosion pressure threshold of the explosion-proof piece is lower than the packaging pressure threshold of the battery. When the pressure inside the battery continues to increase, the pressure inside the battery first reaches the explosion pressure threshold of the explosion-proof plate, and the explosion-proof plate ruptures first, thereby releasing the pressure inside the battery to prevent the battery from exploding. In addition, the debris splashed by the rupture of the explosion-proof plate will also be collected by the protective film above it, ensuring the safety of battery use. Among them, the opening pressure of the explosion-proof valve 6 is generally 0.4~0.8MPa. When this preset pressure value is exceeded, the explosion-proof valve 6 will rupture. Since this is existing technology, we will not elaborate on it here.

[0053] The battery of the second embodiment of the present invention includes a battery housing, a battery cell, an electrolyte and the above-mentioned battery cover. The battery housing has an opening, the battery cell can be accommodated and fixed in the inner cavity of the battery housing along the opening, the battery cover can be sealed and fixed to the opening, and the electrolyte can be injected into the assembled battery housing.

[0054] Furthermore, the tabs on the battery cells are electrically connected to the connector 4 to ensure that the cells can perform normal charge and discharge operations.

[0055] It should be noted that the explanations of the aforementioned battery cover embodiment are also applicable to the battery of this embodiment and will not be elaborated here.

[0056] In summary, the battery cover and battery of the present invention, by changing the layout of the welding points between the connector and the substrate, eliminate the safety hazard caused by aluminum chips and welding slag remaining on the inner side of the substrate during the welding operation of the connector, thereby improving safety as well as battery performance and service life.

[0057] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0058] The foregoing description is intended only to provide specific embodiments of the present invention, which will enable those skilled in the art to understand and implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not intended to be limited to the embodiments described herein, but rather to be embodied in the broadest possible manner consistent with the principles and novel features disclosed herein.

Claims

1. A battery cover, characterized in that: include: a substrate having a substrate outer side and a substrate inner side arranged opposite to each other in a thickness direction; Two poles, each of the two poles is insulated and penetrates the base plate, a groove is axially provided on one end of the pole protruding from the inner side of the base plate, and a welding area is axially provided on the other end of the pole protruding from the outer side of the base plate; Two connecting pieces, one of which is attached to one end of each pole protruding from the inner side of the substrate, the connecting piece is integrally formed with a protrusion adapted to the groove, and the protrusion is assembled in the groove, and the protrusion is welded to the pole in the welding area by laser piercing the top of the pole.

2. The battery cover according to claim 1, characterized in that: The welding area is recessed from the outer side of the substrate toward the inner side of the substrate, and the depth of the recess is 1.5-2 mm.

3. The battery cover according to claim 1, characterized in that: The pole is insulated and connected to the substrate through an injection molded part.

4. The battery cover according to claim 3, characterized in that: Two through holes are provided on the substrate along the length direction, and the two poles are respectively passed through the corresponding through holes and are arranged at a gap with the through holes; The injection molded part is arranged on the substrate, is coaxially arranged with the through hole, and covers the outer wall of the pole protruding from the outside of the substrate, so as to insulate and connect the pole and the substrate together.

5. The battery cover according to claim 4, characterized in that: It also includes a sealing ring, which is sealed between the pole and the through hole.

6. The battery cover according to claim 5, characterized in that: The outer circles of one end of the pole and the sealing ring protruding from the inner side of the substrate are respectively turned outward to form flanges, and the flanges of the pole press the flanges of the sealing ring to fit on the inner side of the substrate.

7. The battery cover according to claim 1, characterized in that: It also includes a lower plastic part, which is arranged between the base plate and the connecting part, and the lower plastic part is riveted to the base plate.

8. The battery cover according to claim 7, characterized in that: A first boss and a second boss protruding away from the substrate are integrally formed on a side of the lower plastic component away from the substrate.

9. The battery cover according to claim 8, characterized in that: It also includes an explosion-proof valve, wherein a pressure relief port is opened on the substrate along the thickness direction, the pressure relief port is connected to the cavity provided inside the second boss, and a plurality of leakage holes are opened on the side of the second boss away from the substrate, and the explosion-proof valve is arranged in the pressure relief port.

10. A battery, characterized in that: The battery shell comprises a battery shell, a battery cell, an electrolyte, and the battery cover according to any one of claims 1 to 9, wherein the battery shell has an opening, the battery cell can be accommodated and fixed in the inner cavity of the battery shell along the opening, the battery cover can be sealed and fixed to the opening, and the electrolyte can be injected into the assembled battery shell.

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