Tab structure, battery structure and electric equipment

Abstract

The utility model discloses a tab structure, a battery structure and electric equipment, and relates to the technical field of low-voltage electric appliances, the tab structure is connected to a switching piece, the switching piece is connected with a pole structure, a fusing part is arranged in the middle of the switching piece, and the fusing part is located between the tab structure and the pole structure. The tab structure comprises a main body part and a redundant part, the end part of the main body part is connected with the battery cell main body, and the middle part of the main body part is connected with the adapter plate. The redundant part is connected with the main body part, and the redundant part is arranged on one side, deviating from the battery cell main body, of the main body part. According to the invention, the possibility that the redundant part is in secondary lap joint with the pole structure in the tab structure can be reduced or avoided, and the high-current protection performance of the fusing part is improved.

Description

Technical Field

[0001] The present application relates to the technical field of low-voltage electrical appliances, and in particular to a tab structure, a battery structure and electrical equipment. Background Art

[0002] As an important carrier of modern energy storage, the safety of energy storage batteries has always been the focus of the industry. In order to ensure the safety and reliability of energy storage batteries during use, a series of strict safety test requirements have been formulated. Among them, the battery does not catch fire or explode in the case of an external short circuit of 1±0.2mohm, and does not rupture or leak at locations other than the pole, which is a particularly critical indicator.

[0003] However, due to the size restrictions and bending requirements of existing energy storage battery cells, the redundant part of the pole head is often long. When the external short circuit of the battery causes the internal fuse structure to melt, the redundant part of the pole head may overlap with the pole again to form a loop. In this case, a large current will be generated again, causing high temperature to damage the pole sealing structure, and then causing serious consequences such as pole leakage or fire and explosion. Utility Model Content

[0004] The present application provides a pole ear structure, a battery structure and an electrical device, which can reduce or avoid the possibility of a redundant part secondary lap pole structure and improve the high current protection performance of the fuse part.

[0005] In a first aspect, the present application provides a pole ear structure connected to a transfer plate, the transfer plate being connected to a pole column structure, a fuse portion being provided in the middle of the transfer plate, the fuse portion being located between the pole ear structure and the pole column structure.

[0006] The tab structure includes a main body and a redundant part, wherein the end of the main body is connected to the battery body, the middle of the main body is connected to the adapter, and the redundant part is connected to the main body, and the redundant part is arranged on a side of the main body away from the battery body.

[0007] The redundant portion is at least partially folded toward the main portion, and a gap exists between the folded redundant portion and the fuse portion.

[0008] The main part is the part where the tab structure and the adapter are ultrasonically welded, and the redundant part is the redundant part of the tab structure. By folding the redundant part, the redundant part can be kept away from the fuse part and a certain distance can be created to avoid the redundant part from overlapping with the pole structure to form a loop after the fuse part is blown out by a large current. This can prevent the redundant part from forming a large current again, causing high temperature to damage the pole sealing structure, thereby preventing the pole from leaking or catching fire or exploding.

[0009] In some examples, the redundant portion is folded toward the battery cell body, or the redundant portion is folded in a direction away from the fuse portion.

[0010] The above structure illustrates two implementation methods of folding the redundant part, both of which can keep the redundant part away from the fuse part and create a certain gap, thereby preventing the redundant part from overlapping with the pole structure to form a loop after the fuse part is blown by a large current. This can prevent the redundant part from forming a large current again, causing high temperature to damage the pole sealing structure, causing the pole to leak or catch fire or explode.

[0011] In some examples, the tab structure is connected to the adapter sheet by ultrasonic welding, and the connection position has an ultrasonic welding mark, and the ultrasonic welding mark is located on the main body.

[0012] There is a first distance between the folded position of the redundant portion and the ultrasonic weld mark, and the thickness of the tab structure is less than the first distance.

[0013] In order to ensure the reliability and stability of welding, in the tab structure, a certain distance needs to be maintained between the folded position of the redundant part and the ultrasonic weld mark, namely the first spacing, which can be the minimum spacing between the straight line corresponding to the folded position and the ultrasonic weld mark. The setting of this spacing is not arbitrary, but a value obtained based on a large number of experiments and tests.

[0014] Folding the redundant part can be an important step in the battery manufacturing process, which helps to enhance the stability and durability of the battery structure. However, if the folding position is too close to the ultrasonic weld mark, it is possible to squeeze or deform the weld mark during the folding process, thereby affecting the stability and reliability of ultrasonic welding. Therefore, ensuring that the thickness of the tab structure is less than the first spacing is the key to preventing this potential risk.

[0015] In some examples, a portion of a first adhesive is disposed on the tab structure, the first adhesive covers at least a portion of the folded redundant portion, and a portion of the first adhesive is adhered to the battery cell body.

[0016] The setting of the first adhesive patch significantly improves the stability and safety of the battery structure. As part of the tab structure in the battery structure, the stability of the redundant part after folding directly affects the safety performance of the battery. The function of the first adhesive patch is to cover at least part of the folded redundant part, thereby enhancing its stability. Specifically, the first adhesive patch uses its sticky properties to firmly fix the folded part of the redundant part in a specific position, effectively reducing or even avoiding its rebound phenomenon.

[0017] In some examples, a portion of a second adhesive is disposed on the adapter sheet, and the second adhesive covers a portion of the first adhesive.

[0018] The second adhesive is used to cover a part of the adapter plate, and its function is to increase the stability of the adapter plate. The second adhesive will cover part of the first adhesive. This setting not only enhances the overall structural strength of the adapter plate, but also improves its adaptability to the external environment during use.

[0019] The second adhesive also helps to improve the stability of the folded part of the redundant part in the folded position. During the use of the adapter, when the first adhesive fails, the redundant part will rebound. If there is not enough stability guarantee, the folded part will easily shift or deform due to improper use or external force. The presence of the second adhesive can effectively limit the movement range of the folded part, so that it always remains in a relatively fixed position, thereby ensuring the circuit breaker protection function after the adapter is blown.

[0020] In some examples, the tab structure includes a positive tab and a negative tab, and the adapter includes a positive adapter and a negative adapter.

[0021] At least one of the positive electrode tabs is connected to the positive electrode adapter, and at least one of the negative electrode tabs is connected to the negative electrode adapter.

[0022] In the internal structure of the battery, at least one positive electrode tab is connected to the positive electrode adapter, and similarly, at least one negative electrode tab is closely connected to the negative electrode adapter. This connection method ensures smooth flow of current between the tab and the adapter, thereby achieving normal operation of the battery structure.

[0023] The positive electrode tab is connected to the positive electrode column structure through the positive electrode adapter, forming a stable and efficient current transmission path. Similarly, the negative electrode tab is also connected to the negative electrode column structure through the negative electrode adapter, ensuring the smooth flow of current.

[0024] In some examples, the fuse is disposed on the positive electrode adapter.

[0025] The positive electrode adapter has a lower melting point and a faster temperature rise than the negative electrode adapter. Therefore, after the fuse is set on the positive electrode adapter, it can be melted more quickly under high current conditions, has a faster response speed, ensures the safety of the battery, and is less likely to cause high temperature to damage the pole sealing structure and cause pole leakage or fire and explosion.

[0026] In some examples, the positive electrode adapter plate is an aluminum adapter plate, and the negative electrode adapter plate is a copper adapter plate.

[0027] There are indeed significant differences in the materials used for positive and negative electrode adapters. Specifically, positive electrode adapters are usually made of aluminum, while negative electrode adapters tend to use copper. This material selection is based on a comprehensive consideration of the two metals' electrochemical properties, conductivity, cost, and processing performance.

[0028] In a second aspect, the present application provides a battery structure, including a battery cell body and the above-mentioned tab structure, wherein the tab structure is arranged on the battery cell body.

[0029] By providing the pole ear structure of the present application, the battery structure can have a higher safety. Specifically, the redundant part in the pole ear structure can be at least partially folded toward the position of the main body. Such a setting not only creates a certain gap between the redundant part and the fuse part, but also ensures the compactness of the structure. The gap formed between the folded redundant part and the fuse part can effectively avoid the situation where the redundant part will overlap with the pole structure for a second time to form a loop after the fuse part is melted and disconnected at a large current, thereby making the battery structure safer.

[0030] In a third aspect, the present application provides an electrical device, comprising the above-mentioned battery structure and a device body, wherein the battery structure is arranged in the device body.

[0031] By providing the pole ear structure of the present application, the battery structure can be made safer, and thus the electrical equipment can be used more safely. Specifically, the redundant portion in the pole ear structure can be at least partially folded toward the position of the main body. Such a setting not only creates a certain gap between the redundant portion and the fuse portion, but also ensures the compactness of the structure. The gap formed between the folded redundant portion and the fuse portion can effectively avoid the situation where the redundant portion will overlap with the pole structure for a second time to form a loop after the fuse portion is blown out by a large current, thereby making the battery structure safer, and thus the electrical equipment can be used more safely. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the present application or the prior art, the drawings required for use in the examples or prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some examples of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 This is a structural schematic diagram of a case where the electrical device in an example of the present application is a vehicle;

[0034] Figure 2 It is a structural schematic diagram of the connection between the tab structure and the adapter sheet on the battery structure in the prior art;

[0035] Figure 3 It is a schematic diagram of the structure of the battery structure after the tab structure is glued in the prior art;

[0036] Figure 4 It is a schematic diagram of the structure of the battery structure in the prior art when the adapter plate and the pole on the top cover are laser welded;

[0037] Figure 5 For the existing technology Figure 4 A in the middle shows a partial enlarged schematic diagram of the redundant part of the tab structure;

[0038] Figure 6 It is a schematic diagram of the structure after the laser welding mark and the tab structure are covered with glue in the prior art;

[0039] Figure 7 It is a structural schematic diagram of a connection between a tab structure and a transfer sheet in an example of the present application;

[0040] Figure 8 This is a schematic diagram of the structure after the redundant part of the positive electrode tab in an example of the present application is folded;

[0041] Fig. 9 It is a structural schematic diagram of a first adhesive tape being arranged on the tab structure in an example of the present application, and the adhesive tape portion on the positive tab covers a portion of the redundant portion;

[0042] Fig.10 This is a schematic diagram of the structure after the adapter plate and the pole on the top cover in the battery structure in an example of the present application are laser welded;

[0043] Fig.11 This is a partial enlarged schematic diagram showing the folded redundant portion on the positive electrode tab in an example of the present application;

[0044] Fig.12 This is a schematic diagram of the structure after the second adhesive covers the laser welding mark and the tab structure in an example of the present application;

[0045] Fig.13 This is a schematic diagram of the structure after the redundant part of the positive electrode tab in another example of the present application is folded;

[0046] Fig.14 It is a structural schematic diagram of another example of the present application in which a first adhesive is arranged on the tab structure and the adhesive portion on the positive tab covers a portion of the redundant portion;

[0047] Fig.15 This is a schematic diagram of the structure after the adapter plate and the pole on the top cover in the battery structure in another example of the present application are laser welded;

[0048] Fig.16 This is a partial enlarged schematic diagram showing the folded redundant portion on the positive electrode tab in another example of the present application.

[0049] Reference numerals:

[0050] 100, ear structure; 110, main body; 111, ultrasonic welding mark; 120, redundant part; 100a, positive ear; 100b, negative ear; 200, adapter; 210, ear connection; 220, pole connection; 221, laser welding mark; 230, fuse; 240, transition part; 200a, positive adapter; 200b, negative adapter; 300, pole structure; 400, battery body; 410, first adhesive; 500, cover; 510, second adhesive; 1000, electrical equipment; 1100, battery structure; 1200, controller; 1300, motor. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and examples. It should be understood that the specific examples described here are only used to explain the present application and are not used to limit the present application.

[0052] As an important carrier of modern energy storage, the safety of energy storage batteries has always been the focus of the industry. In order to ensure the safety and reliability of energy storage batteries during use, the country has formulated a series of strict national standard safety test requirements. Among them, the battery does not catch fire or explode in the case of an external short circuit of 1±0.2mohm, and does not rupture or leak at locations other than the pole, which is a particularly critical indicator.

[0053] In practical applications, when a secondary battery forms an electrical circuit through an external short circuit, the pole position often bears a huge current impact. According to Joule's law, Q = I 2 Rt, the effect of current on heat grows exponentially. This means that as the current increases, the heat generated inside the battery will also rise sharply, posing a serious threat to the safety of the battery.

[0054] In order to avoid the accumulation of heat from large currents, which may lead to the increase of pole temperature, and then cause pole rupture or even insulation failure, fire and explosion, it is particularly important to cut off the current in time and ensure that the electric circuit is not formed again. At present, the mainstream way to cut off the current in the market mainly relies on the positive aluminum adapter. This adapter has a low melting point (about 620℃) and a large resistance. It can quickly heat up and melt in a short time, thereby cutting off the electric circuit.

[0055] However, existing energy storage batteries still have certain safety risks in their design. Due to the size limitation of the battery cell and the need to bend, the redundant part of the tab head is often longer. At the same time, considering factors such as tab misalignment, when the external short circuit of the battery causes the internal fuse to blow, the redundant part of the tab head may overlap with the pole again to form a loop. In this case, a large current will be generated again, causing high temperature to damage the sealing structure of the pole, and then causing serious consequences such as pole leakage or fire and explosion.

[0056] In addition, although cutting the redundant parts of the tabs can shorten their length, it will also bring new problems. The metal shavings generated during the cutting process are difficult to control, and once they enter the battery, they may have a potential impact on the performance and safety of the battery.

[0057] Specifically, refer to Figures 2 to 6 , the processing technology of battery structure can include:

[0058] The first step is to ultrasonically weld the tab structure to the adapter (see Figure 2 ), the second step is to glue the tab structure, and the glued part does not reach the position close to the ultrasonic welding mark (for details, refer to Figure 3 ), the third step is to laser weld the adapter to the pole on the top cover and form a laser weld mark (see Figure 4 ), Figure 5 The enlarged schematic diagram of the redundant part of the tab structure in the prior art showing the risk of overlap is shown in FIG. 4 . The fourth step is to apply glue to cover the laser welding mark and the tab structure (see FIG. 5 for details). Figure 6 ).

[0059] In the above steps, the glue-applying part does not reach the position close to the ultrasonic welding mark, which will leave the redundant part of the pole ear structure in a free state, and there is a risk of secondary overlapping of the pole structure.

[0060] In order to alleviate the problem that the redundant part of the tab head may overlap with the pole again to form a loop, the applicant has found that the redundant part of the tab head can be appropriately bent, such as folding the redundant part in the direction away from the fuse, which can solve the problem that the redundant part of the tab head may overlap with the pole again to form a loop to a certain extent.

[0061] The battery structure disclosed in the embodiment of the present application can be used, but is not limited to, in electrical devices such as vehicles, ships or aircraft. A power supply system comprising the battery structure and battery disclosed in the present application can be used to form the electrical device, which is conducive to alleviating and automatically adjusting the deterioration of the expansion force of the battery cell, replenishing the consumption of the electrolyte, and improving the stability of the battery performance and the battery life. Electrical equipment includes the above-mentioned battery structure and the equipment body, and the battery structure is arranged in the equipment body.

[0062] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0063] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0064] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery structure 1100 is provided inside the vehicle 1000, and the battery structure 1100 may be provided at the bottom, head or tail of the vehicle 1000. The battery structure 1100 may be used to power the vehicle 1000, for example, the battery structure 1100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 1200 and a motor 1300, and the controller 1200 is used to control the battery structure 1100 to power the motor 1300, for example, for the starting, navigation and working power requirements of the vehicle 1000 during driving.

[0065] In some embodiments of the present application, the battery structure 1100 can not only serve as the operating power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0066] The present application also provides a battery structure, including a battery cell main body and the above-mentioned pole ear structure, and the pole ear structure is arranged on the battery cell main body. By setting the pole ear structure of the present application, the battery structure can have higher safety. Specifically, the redundant part in the pole ear structure can be at least partially folded toward the position of the main body. Such a setting not only creates a certain gap between the redundant part and the fuse part, but also ensures the compactness of the structure. The gap formed between the folded redundant part and the fuse part can effectively avoid the situation where the redundant part will overlap with the pole structure for a second time to form a loop after the fuse part is melted and disconnected by a large current, thereby making the battery structure safer.

[0067] To solve the above technical problems, please refer to Figure 7-Figure 16As shown, the present application also proposes a pole ear structure 100 , which can reduce or avoid the possibility of the redundant part 120 overlapping the pole structure 300 for the second time, and improve the high current protection performance of the fuse part 230 .

[0068] Reference Figure 7 and Figure 8 In some examples, the pole ear structure 100 is connected to the adapter 200, the adapter 200 is connected to the pole structure 300, a fuse part 230 is provided in the middle of the adapter 200, and the fuse part 230 is located between the pole ear structure 100 and the pole structure 300.

[0069] The tab structure 100 includes a main body 110 and a redundant part 120. The end of the main body 110 is connected to the battery body 400, and the middle of the main body 110 is connected to the adapter 200. The redundant part 120 is connected to the main body 110 and is arranged on a side of the main body 110 away from the battery body 400.

[0070] The redundant portion 120 is at least partially folded toward the main portion 110 , and a gap exists between the folded redundant portion 120 and the fuse portion 230 .

[0071] The main body 110 is the part where the tab structure 100 and the adapter 200 are ultrasonically welded, and the redundant part 120 is the redundant part of the tab structure 100. By partially folding the redundant part 120, the redundant part 120 can be kept away from the fuse part 230 and a certain distance can be generated to avoid the redundant part 120 from overlapping with the pole structure 300 to form a loop after the fuse part 230 is blown and disconnected by a large current. In this way, it can be avoided that the redundant part 120 forms a large current again, causing high temperature to damage the pole sealing structure, thereby avoiding leakage of the pole or fire and explosion.

[0072] The adapter 200 can serve as a connecting bridge between the tab structure 100 and the pole structure 300. The adapter 200 can be connected to the tab structure 100, and at least one tab structure 100 can be reliably connected to the pole structure 300 through the adapter 200. A fuse 230 can be provided in the middle of the adapter 200. The fuse 230 is located between the tab structure 100 and the pole structure 300, forming a key safety link. When a large current occurs in the battery structure where the tab structure 100 is located, the fuse 230 can quickly heat up and disconnect, thereby blocking the large current, ensuring the safety of the battery structure, and preventing the battery structure from exploding due to the large current.

[0073] The tab structure 100 itself can be composed of a main body 110 and a redundant part 120, wherein the end of the main body 110 is connected to the corresponding battery body 400 to ensure smooth transmission of current. The middle part of the main body 110 can be tightly connected to the adapter 200, specifically, ultrasonic welding can be used for connection, and a corresponding ultrasonic weld mark 111 can be formed in the middle part of the main body 110, so that the connection between the entire tab structure 100 and the adapter 200 can be more stable and reliable.

[0074] The redundant part 120 is another part connected to the main body 110. The redundant part 120 is the redundant part of the tab structure 100. This part may generate metal shavings when removed by cutting, which may easily cause a short circuit in the battery cell body 400, posing a safety risk. The redundant part 120 is arranged on the side of the main body 110 away from the battery cell body 400. It is the redundant part after the tab structure 100 is connected to the adapter 200. This part has a certain safety risk, which can be reduced by folding.

[0075] The redundant part 120 may be at least partially folded toward the position of the main part 110. Such a configuration not only creates a certain gap between the redundant part 120 and the fuse part 230, but also ensures the compactness of the structure. The gap formed between the folded redundant part 120 and the fuse part 230 can effectively prevent the redundant part 120 from overlapping with the pole structure 300 to form a loop after the fuse part 230 is blown by a large current.

[0076] The main body 110 can be used as the part for ultrasonic welding of the tab structure 100 and the adapter 200, and the welding quality is directly related to the stability and safety of the entire structure. The redundant part 120, as the redundant part of the tab structure 100, may not be conspicuous under normal circumstances, but may pose a greater safety hazard at a critical moment.

[0077] Specifically, when an abnormality occurs inside the battery structure or in the circuit where the battery structure is located, a large current will flow through the fuse part 230 and cause it to melt. Since the redundant part 120 has been folded and has a certain distance from the fuse part 230, it will not form a loop with the pole structure 300 again. In this way, it is possible to effectively avoid the high temperature caused by the large current formed again by the redundant part 120 to damage the pole sealing structure, thereby avoiding the occurrence of serious consequences such as pole leakage or fire and explosion.

[0078] In addition, the arrangement of the redundant part 120 also fully considers various possible situations of the battery during actual use. For example, when the battery is subjected to external impact or vibration, the folding arrangement of the redundant part 120 can alleviate the impact force to a certain extent and protect the main body 110 and the adapter 200 from damage. At the same time, due to the interval between the redundant part 120 and the fuse part 230, even in extreme cases, safety problems such as short circuit or fire caused by accidental contact between the redundant part 120 and the pole structure 300 can be prevented.

[0079] The connection method between the tab structure 100 and the adapter 200 can utilize the folding of the redundant part 120 to effectively improve the safety performance of the battery. It can not only ensure the smooth transmission of current under normal circumstances, but also quickly cut off the current under abnormal circumstances, and it is not easy to generate a secondary connection circuit, thereby preventing the occurrence of safety accidents.

[0080] The tab connection portion 210 can be connected by ultrasonic welding, and an ultrasonic weld mark 111 will be generated on the corresponding adapter 200. The ultrasonic weld mark 111 can be located on the main body 110 of the tab structure 100, and the ultrasonic weld mark 111 can connect the main body 110 with the tab connection portion 210.

[0081] The adapter 200 includes a tab connection portion 210 connected to the tab structure 100 , a pole connection portion 220 connected to the pole structure 300 , and a fuse portion 230 for fusing and cutting off the circuit when a large current is generated.

[0082] The adapter 200 and the pole structure 300 can be connected by laser welding, and a laser welding mark 221 will be generated on the corresponding adapter 200. The laser welding mark 221 can be located at the pole connection portion 220 on the adapter 200, and the laser welding mark 221 can connect the pole structure 300 to the pole connection portion 220.

[0083] When a large current flows through the battery in which the tab structure 100 is located, the fuse part 230 can fuse and cut off the power supply circuit, thereby preventing the heat-generating battery cell from losing control.

[0084] One adapter 200 can be connected to two battery cells at the same time, and the corresponding adapter 200 can be a "T" shaped structure. At this time, the adapter 200 can include two pole ear connection parts 210 and a pole connection part 220, a transition part 240 can be provided between the two pole ear connection parts 210, and the fuse part 230 can be provided between the transition part 240 and the pole connection part 220.

[0085] The tab connection portion 210 connects the tab structure 100 to the adapter 200 to ensure smooth transmission of current. By utilizing high-frequency ultrasonic vibration, the metal material between the tab connection portion 210 and the adapter 200 is partially melted, and then rapidly cooled and solidified to form a solid connection point. This process will leave obvious ultrasonic welding marks 111 on both the tab structure 100 and the adapter 200 as a direct reflection of the welding quality.

[0086] The ultrasonic weld mark 111 not only exists in the tab connection part 210, but can further extend to the main body 110 on the tab structure 100. The ultrasonic weld mark 111 in the figure is an ultrasonic weld mark 111 extending to the main body 110. The ultrasonic welding technology not only realizes the connection between the tab connection part 210 and the tab structure 100, but also can better judge whether the connection between the main body 110 and the tab connection part 210 is stable through the remaining ultrasonic weld mark 111. This connection method has the characteristics of high reliability and excellent conductivity, and can meet the stable operation requirements of the battery under harsh conditions such as high load and high current density.

[0087] Laser welding technology can achieve the connection between the adapter 200 and the pole structure 300. Through the focusing and scanning of the laser beam, the metal material between the adapter 200 and the pole is melted in an instant, and then quickly cooled to form a strong connection. The laser welding mark 221 is a mark generated during the laser welding process. The laser welding mark 221 can be clearly displayed on the pole connection part 220 on the adapter 200, proving that the laser welding is successfully completed.

[0088] The laser welding mark 221 can not only ensure the connection strength between the pole structure 300 and the pole connection part 220, but also improve the overall stability of the battery structure. In addition, the laser welding technology also has the advantages of fast welding speed and small heat-affected zone, which helps to reduce production costs and improve production efficiency.

[0089] The fuse 230 is an important component of the adapter 200, and can quickly fuse and cut off the power supply circuit when a large current appears in the battery where the tab structure 100 is located. This function can solve safety problems such as battery overheating and cell loss of control. When an abnormal situation occurs inside the battery, such as a short circuit, overcharging, etc., causing an abnormal increase in current, the fuse 230 will respond quickly and fuse, thereby cutting off the power supply circuit to prevent further damage to the battery or causing a safety accident.

[0090] In some examples, the redundant portion 120 is folded toward the battery cell body 400, as shown in FIG. Fig.11 Alternatively, the redundant portion 120 is folded in a direction away from the fuse portion 230, see 13 to 16 for details.

[0091] The above structures illustrate two implementations of folding the redundant part 120, both of which can keep the redundant part 120 away from the fuse part 230 and create a certain gap, thereby preventing the redundant part 120 from overlapping with the pole structure 300 to form a loop after the fuse part 230 is blown by a large current. In this way, it can be avoided that the redundant part 120 forms a large current again, causing high temperature to damage the pole sealing structure, causing the pole to leak or catch fire and explode.

[0092] The folding direction of the redundant part 120 will have a certain impact on the safety performance of the battery, as long as the redundant part 120 or part thereof can be sufficiently spaced from the fuse part 230. The redundant part 120 can be folded in two main ways: one is folded toward the battery body 400, and the other is folded away from the fuse part 230. These two implementations have their own structural characteristics, but their common goal is to keep the redundant part 120 away from the fuse part 230 and form a certain distance between the two.

[0093] When the redundant part 120 is folded toward the battery cell body 400, the redundant part 120 is folded toward the battery cell body 400 by a specific process. This folding method can effectively isolate the redundant part 120 from the fuse part 230 to avoid direct physical contact between the two. When the fuse part 230 is blown and disconnected under the action of a large current, since the redundant part 120 has been folded and away from the fuse part 230, the risk of the redundant part 120 overlapping the pole structure 300 again to form a loop can be greatly reduced.

[0094] The setting of the redundant part 120 being folded in a direction away from the fuse part 230 can also achieve the purpose of isolating the redundant part 120 from the fuse part 230. In this setting, the redundant part 120 can be folded in a direction away from the fuse part 230 by a specific process. This folding method can also produce a certain interval, so that a sufficient distance is maintained between the redundant part 120 and the fuse part 230, preventing the redundant part 120 from contacting with the pole structure 300 to form a loop after a large current is blown and the circuit is broken.

[0095] These two folding methods not only effectively avoid direct contact between the redundant part 120 and the fuse part 230, but also prevent the problem of high temperature damaging the pole sealing structure due to the high current generated by the redundant part 120 again. Once the pole sealing structure is damaged, it may cause serious consequences such as pole leakage or fire and explosion. Therefore, by reasonably setting the folding method of the redundant part 120, the safety performance of the battery can be significantly improved and potential safety risks can be reduced.

[0096] In practical applications, the folding method to be selected depends on the specific battery structure and setting requirements. It is necessary to comprehensively consider the feasibility and effect of folding the redundant part 120 according to factors such as the size, capacity, and working environment of the battery, so as to select the most appropriate folding method. And the present application is not limited to the above two folding methods, as long as the redundant part 120 can be kept away from the fuse part 230 and a certain interval can be formed between the redundant part 120 and the fuse part 230.

[0097] Reference Figures 7 to 10 In some examples, the tab structure 100 is connected to the adapter sheet 200 by ultrasonic welding, and the connection position has an ultrasonic welding mark 111 , which is located on the main body 110 .

[0098] There is a first distance between the folded position of the redundant part 120 and the ultrasonic weld mark 111, and the thickness of the tab structure 100 is less than the first distance. Such a setting can prevent the redundant part 120 from affecting the stability of the ultrasonic weld mark 111 during the folding process, thereby ensuring the reliability of ultrasonic welding.

[0099] The connection between the tab structure 100 and the adapter 200 can be achieved by ultrasonic welding technology. This connection method is not only efficient and environmentally friendly, but also can ensure the stability and reliability of the connection. During the welding process, obvious ultrasonic welding marks 111 will be formed at the connection position. These welding marks are like "branding" of the welding process, located on the main body 110, to prove the successful completion of the welding operation.

[0100] In order to ensure the reliability and stability of welding, in the tab structure 100, a certain distance, i.e., a first spacing, needs to be maintained between the folded position of the redundant portion 120 and the ultrasonic weld mark 111. The first spacing may be the minimum spacing between the straight line corresponding to the folded position and the ultrasonic weld mark 111. The setting of this spacing is not arbitrary, but is a value obtained based on a large number of experiments and tests.

[0101] The folding of the redundant part 120 can be an important step in the battery manufacturing process, which helps to enhance the stability and durability of the battery structure. However, if the folding position is too close to the ultrasonic weld mark 111, it is possible to squeeze or deform the weld mark during the folding process, thereby affecting the stability and reliability of the ultrasonic welding. Therefore, ensuring that the thickness of the tab structure 100 is less than the first spacing is the key to preventing this potential risk.

[0102] In addition, this arrangement can also reduce the interference that may be caused to the internal structure of the battery during the folding process of the redundant part 120. Since the thickness of the tab structure 100 is strictly controlled, even during the folding process, it will not cause pressure or damage to other components inside the battery. This helps to keep the interior of the battery clean and orderly, and improve the overall performance and service life of the battery.

[0103] Reference Fig. 9 and Fig.10 In some examples, a portion of the first adhesive 410 is disposed on the tab structure 100 , the first adhesive 410 covers at least a portion of the folded redundant portion 120 , and a portion of the first adhesive 410 is adhered to the battery cell body 400 .

[0104] The provision of the first adhesive 410 significantly improves the stability and safety of the battery structure.

[0105] The redundant part 120 is a part of the tab structure 100 in the battery structure. The stability of the redundant part 120 after folding directly affects the safety performance of the battery. The first adhesive 410 is used to cover at least part of the folded redundant part 120, thereby enhancing its stability. Specifically, the first adhesive 410 firmly fixes the folded part of the redundant part 120 at a specific position through its adhesive properties, effectively reducing or even avoiding its rebound phenomenon.

[0106] This fixing effect not only helps to maintain the stability of the battery structure, but also effectively prevents the folded part of the redundant part 120 from overlapping the pole structure 300. It is worth noting that the overlap here may include both direct and indirect situations. That is to say, if the folded part of the redundant part 120 rebounds, it may directly contact the pole structure 300, or it may indirectly form an electrical connection with the pole structure 300 through other structures (such as the adapter 200). In either case, it may interfere with the normal operation of the battery and even cause safety hazards. Therefore, the provision of the first adhesive 410 can prevent this undesirable phenomenon.

[0107] In addition, the first adhesive 410 also has the function of isolation protection. In the battery structure, the electrical insulation between the tab structure 100 and other components (such as the cover plate 500) is very important. If the insulation performance is poor, it may cause a short circuit inside the battery, thereby causing serious safety problems. The first adhesive 410, as a barrier, can effectively isolate the tab structure 100 from other structures and improve the electrical insulation between them.

[0108] In addition to the above functions, the setting of the first adhesive 410 also reflects the fine control of details. For example, during the adhesive process, the position and strength of the adhesive need to be strictly controlled to ensure that it can play a role in fixing and isolating without causing additional pressure or damage to the battery structure. This attention to and control of details is an important part of the battery manufacturing process, which can further ensure the yield of the product.

[0109] In summary, the arrangement of the first adhesive 410 in the battery structure not only improves the stability of the redundant part 120 after folding, prevents the occurrence of poor overlap, but also enhances the electrical insulation between the tab structure 100 and other components. At the same time, its fine arrangement also reflects the strict control of details in the battery manufacturing process. These advantages jointly improve the performance and safety of the battery and provide a strong guarantee for the normal operation of the battery.

[0110] Reference Fig.12 In some examples, a portion of the second adhesive 510 is disposed on the adapter sheet 200 , and the second adhesive 510 covers a portion of the first adhesive 410 .

[0111] The second adhesive 510 covers a part of the area on the adapter 200, and its function is to increase the stability of the adapter 200. The second adhesive 510 covers part of the first adhesive 410. This arrangement not only enhances the overall structural strength of the adapter 200, but also improves its adaptability to the external environment during use.

[0112] Specifically, the presence of the second adhesive 510 significantly improves the bonding stability of the first adhesive 410. Since the first adhesive 410 plays a basic connection and fixing role in the adapter 200, the second adhesive 510 further reinforces it. This double guarantee enables the adapter 200 to maintain a more stable connection state when subjected to external pressure, thereby avoiding performance degradation caused by looseness.

[0113] The second adhesive 510 also helps to improve the stability of the folded portion of the redundant part 120 in the folded position. During the use of the adapter 200, when the first adhesive 410 fails, the redundant part 120 will rebound. If there is no sufficient stability guarantee, the folded portion is easily displaced or deformed due to improper use or external force. The presence of the second adhesive 510 can effectively limit the movement range of the folded portion, so that it always remains in a relatively fixed position, thereby ensuring the circuit breaker protection function after the adapter 200 is blown.

[0114] The second adhesive 510 can also isolate and protect the adapter 200. When the adapter 200 is connected to other structures (such as the cover 500, etc.), electrical connection is often required. The second adhesive 510 can be used as an electrical insulating material to effectively isolate the electrical connection between the adapter 200 and other structures, thereby improving the electrical safety of the entire system.

[0115] In some examples, the tab structure 100 includes a positive tab 100a and a negative tab 100b, and the adapter includes a positive adapter 200a and a negative adapter 200b.

[0116] At least one positive electrode tab 100a is connected to the positive electrode adapter 200a, and at least one negative electrode tab 100b is connected to the negative electrode adapter 200b.

[0117] In the internal structure of the battery, at least one positive electrode tab 100a is connected to the positive electrode adapter 200a, and similarly, at least one negative electrode tab 100b is closely connected to the negative electrode adapter 200b. This connection method ensures smooth flow of current between the tab and the adapter, thereby achieving normal operation of the battery structure.

[0118] The positive electrode tab 100a is connected to the positive electrode column structure 300 through the positive electrode adapter 200a, forming a stable and efficient current transmission path. Similarly, the negative electrode tab 100b is also connected to the negative electrode column structure 300 through the negative electrode adapter 200b, ensuring smooth current flow.

[0119] Both the positive electrode adapter 200a and the negative electrode adapter 200b can adopt a unique "T" shaped structure. This arrangement enables one adapter to connect two pole tabs at the same time, thereby achieving a more compact battery structure. Specifically, one positive electrode adapter 200a can be connected to two positive pole tabs 100a at the same time, and these two positive pole tabs 100a are then connected to the positive pole column structure 300 through the positive electrode adapter 200a. Similarly, one negative electrode adapter 200b can also be connected to two negative pole tabs 100b at the same time, and these two negative pole tabs 100b are then connected to the negative pole column structure 300 through the negative electrode adapter 200b.

[0120] This "T"-shaped adapter not only simplifies the internal structure of the battery, but also improves the current transmission efficiency. By reducing the connection points between the adapter and the tab, the resistance is reduced, thereby improving the overall performance of the battery. In addition, this setting also helps to improve the safety performance of the battery because it reduces potential failure points and reduces the risk of battery short circuit or overheating.

[0121] In practical applications, this arrangement of tabs and adapters can be widely used in various types of batteries, such as lithium-ion batteries, sodium-ion batteries, nickel-hydrogen batteries, etc. By optimizing the structure and connection method of tabs and adapters, the performance and stability of the battery can be further improved, providing more reliable and efficient energy support for various electronic devices.

[0122] In some examples, the fuse part 230 is disposed on the positive electrode adapter 200a. The positive electrode adapter 200a has a lower melting point and a faster temperature rise than the negative electrode adapter 200b. Therefore, after the fuse part 230 is disposed on the positive electrode adapter 200a, it can be melted more quickly under high current conditions, has a faster response speed, ensures the safety of the battery, and is less likely to cause high temperature to damage the pole sealing structure and cause pole leakage or fire and explosion.

[0123] The fuse part 230 is arranged and placed on the positive electrode adapter 200a. The positive electrode adapter 200a, as a key component for current transmission inside the battery, has significantly different characteristics from the negative electrode adapter 200b. In contrast, the positive electrode adapter 200a has a lower melting point and faster temperature rise characteristics. This means that when the battery encounters abnormal conditions, such as overcharge, over discharge or short circuit, the positive electrode adapter 200a will reach the fuse temperature faster, thereby triggering the fuse mechanism.

[0124] Setting the fuse 230 on the positive electrode adapter 200a not only speeds up the fusing speed, but also significantly improves the safety performance of the battery. Under high current conditions, the positive electrode adapter 200a can respond quickly and initiate fusing, effectively cutting off the abnormal current path of the battery. This rapid response mechanism ensures that the battery can protect itself in a timely and effective manner when encountering dangerous situations, thereby avoiding damage to the pole sealing structure caused by high temperature and reducing the risk of pole leakage or fire and explosion.

[0125] In addition, the rapid fusing of the positive electrode adapter 200a also helps to reduce the energy release of the battery under abnormal conditions, reduces the electrolyte decomposition and harmful gas generation caused by high temperature, thereby protecting the surrounding environment of the battery and the safety of the user.

[0126] By simulating the working conditions of the battery under abnormal conditions such as overcharge, over discharge and short circuit, the fusing speed and fusing effect of the fusing part 230 of the positive electrode adapter 200a are observed and recorded. Under limited experiments, setting the fusing part 230 on the positive electrode adapter 200a can indeed significantly improve the response speed and safety of the battery.

[0127] In some examples, the positive electrode adapter 200a is an aluminum adapter, and the negative electrode adapter 200b is a copper adapter.

[0128] There are indeed obvious differences in the materials used for the positive electrode adapter 200a and the negative electrode adapter 200b. Specifically, the positive electrode adapter 200a is usually made of aluminum, while the negative electrode adapter 200b is more likely to be made of copper. This material selection is based on comprehensive considerations of the electrochemical properties, conductivity, cost, and processing performance of the two metals.

[0129] From the perspective of electrochemical properties, the potential difference between aluminum and copper in the battery system is large, which enables aluminum and its alloys to be used as positive and negative electrode materials of the battery, effectively separating the positive and negative charges inside the battery, thereby ensuring the normal operation of the battery. At the same time, aluminum materials have a lower potential and are suitable as positive electrode materials, while copper materials have a higher potential and are more suitable as negative electrode materials.

[0130] In terms of conductivity, aluminum and copper are both excellent conductive materials. However, due to the lower density of aluminum, its conductivity is slightly inferior to that of copper. However, considering the function of the positive electrode adapter 200a in the battery, its conductivity is sufficient to meet the requirements. As an excellent conductive material, copper has excellent conductivity, which can ensure that the negative electrode adapter 200b plays a better conductive role in the battery.

[0131] Cost is also an important factor affecting material selection. Aluminum materials are cheaper than copper materials. This makes it possible to reduce production costs and improve product competitiveness when aluminum materials are used for the positive electrode adapter 200a. Although copper materials are more expensive, their excellent electrical conductivity and good processing performance make them still have certain advantages in the application of the negative electrode adapter 200b.

[0132] From the perspective of processing performance, both aluminum and copper have good processability. Aluminum materials can be made into the desired shape and size through processes such as rolling and extrusion, and copper materials can also be processed through similar processes. This allows the positive electrode adapter 200a and the negative electrode adapter 200b to be customized according to different needs during the manufacturing process to meet the requirements of actual applications.

[0133] The positive electrode adapter plate 200a is made of aluminum material, and the negative electrode adapter plate 200b is made of copper material, which is based on comprehensive considerations of the electrochemical properties, electrical conductivity, cost, and processing performance of the two metals.

[0134] In the present application, the materials of the positive electrode adapter sheet 200a and the negative electrode adapter sheet 200b are not limited to the above-mentioned case where the positive electrode adapter sheet 200a is an aluminum adapter sheet and the negative electrode adapter sheet 200b is a copper adapter sheet, and other materials may also be selected as needed.

[0135] The same or similar numbers in the drawings of this application correspond to the same or similar parts; in the description of this application, it should be understood that if the terms "upper", "lower", "left", "right", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings. This is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0136] The above are only preferred examples of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A tab structure, characterized in that: Connected to the adapter, the adapter is connected to the pole structure, a fuse is provided in the middle of the adapter, and the fuse is located between the pole ear structure and the pole structure; the pole ear structure includes: A main body, an end of which is connected to the battery body, and a middle part of which is connected to the adapter; A redundant part connected to the main body, wherein the redundant part is arranged on a side of the main body away from the battery body; The redundant portion is at least partially folded toward the main portion, and a gap exists between the folded redundant portion and the fuse portion.

2. The tab structure according to claim 1, characterized in that: The redundant portion is folded toward the direction of the battery cell body, or the redundant portion is folded toward a direction away from the fuse portion.

3. The tab structure according to claim 1, characterized in that: The tab structure is connected to the adapter sheet by ultrasonic welding, and the connection position has an ultrasonic welding mark, and the ultrasonic welding mark is located on the main body; There is a first distance between the folded position of the redundant portion and the ultrasonic weld mark, and the thickness of the tab structure is less than the first distance.

4. The tab structure according to claim 1, characterized in that: A portion of the first adhesive is provided on the tab structure, the first adhesive covers at least a portion of the folded redundant portion, and a portion of the first adhesive is adhered to the battery cell body.

5. The tab structure according to claim 4, characterized in that: The adapter sheet is provided with a portion of a second adhesive, and the second adhesive covers a portion of the first adhesive.

6. The tab structure according to any one of claims 1 to 5, characterized in that: The tab structure includes a positive tab and a negative tab, and the adapter includes a positive adapter and a negative adapter; At least one of the positive electrode tabs is connected to the positive electrode adapter, and at least one of the negative electrode tabs is connected to the negative electrode adapter.

7. The tab structure according to claim 6, characterized in that: The fuse part is arranged on the positive electrode adapter plate.

8. The tab structure according to claim 6, characterized in that: The positive electrode adapter plate is an aluminum adapter plate, and the negative electrode adapter plate is a copper adapter plate.

9. A battery structure, characterized in that: include: Battery cell body; The pole ear structure according to any one of claims 1 to 8, wherein the pole ear structure is arranged on the battery cell body.

10. An electrical device, characterized in that: include: The battery structure as claimed in claim 9; and, The device body is provided with the battery structure.

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