Battery cell and battery pack

Abstract

The utility model provides a battery monomer and a battery pack, and relates to the field of batteries. Each single battery comprises at least two naked battery cells and a connecting piece; the connecting piece comprises a first connecting part, a second connecting part, a substrate and a composite pole; the first connecting surface of the first connecting part is connected with the second end of a first naked battery cell in the adjacent naked battery cells, and the second connecting surface of the second connecting part is connected with the first end of a second naked battery cell in the adjacent naked battery cells; the second connecting surface of the first connecting part is connected with the first connecting surface of the substrate, and the first connecting surface of the second connecting part is connected with the second connecting surface of the substrate; and the composite pole penetrates through the substrate and is connected with the first connecting part and the second connecting part. The battery monomer provided by the embodiment of the utility model is high in structural strength, high in quick charge capacity, simple in production process and relatively high in manufacturability.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular, to a battery cell and a battery pack. Background Art

[0002] Batteries are crucial in the new energy sector. They are core components for storing and delivering electrical energy, directly impacting the performance, endurance, and reliability of devices such as electric vehicles and energy storage systems. As a key carrier of clean energy, batteries can effectively store and smoothly output renewable energy (such as solar and wind energy), helping to reduce dependence on fossil fuels and promote the transition to a more sustainable energy structure.

[0003] With the advancement of battery technology, batteries are becoming increasingly longer to improve space utilization and energy density. Extending the cells allows for more compact arrangement within the battery pack, reducing the space occupied by structures like brackets, thereby increasing battery capacity. Furthermore, longer cells help simplify battery system architecture, reduce system complexity and cost, and improve battery life, meeting the demand for efficient energy storage in applications such as new energy vehicles.

[0004] Currently, two medium-length cells (500 to 650 mm) can be arranged in the Y direction of the battery pack, but the presence of horizontal and vertical beams limits space utilization. To improve space utilization, the cell length has been extended (900 to 1300 mm), allowing only one cell to be arranged in the Y direction. However, excessively long cells increase production process difficulty, reduce yield, and have poor manufacturability, while also reducing fast-charging capabilities. Utility Model Content

[0005] In view of the above problems, the purpose of the embodiments of the present application is to provide a battery cell and battery pack that does not require horizontal and vertical beams when assembled, thereby improving space utilization. The structure has high strength, strong fast charging capability, simple production process, and high manufacturability.

[0006] In the first aspect, an embodiment of the present application provides a battery cell, which includes: at least two bare cells and a connector; the connector includes a first connecting part, a second connecting part, a substrate and a composite pole; the first connecting surface of the first connecting part is connected to the second end of the first bare cell in adjacent bare cells, and the second connecting surface of the second connecting part is connected to the first end of the second bare cell in adjacent bare cells; the second connecting surface of the first connecting part is connected to the first connecting surface of the substrate, and the first connecting surface of the second connecting part is connected to the second connecting surface of the substrate; the composite pole passes through the substrate and connects the first connecting part and the second connecting part.

[0007] In the above implementation process, the battery cell structure connects adjacent bare cells through connectors to form a longer battery cell (between 900 and 1300 mm). Due to the provision of the connectors in the embodiment of the present application, the connection stability and overall performance between the cells are improved, which helps to improve the safety and energy efficiency of the battery. When the battery cells are packed together, there is no need to set up horizontal and vertical beams, which further improves space utilization. The structure has high strength, strong fast charging capability, simple production process, and high manufacturability.

[0008] Optionally, in an embodiment of the present application, the first connecting part includes a first connecting piece having a first through hole, the second connecting part includes a second connecting piece having a second through hole, and the substrate includes an intermediate connecting hole; the composite pole passes through the intermediate connecting hole, the first through hole, and the second through hole, and protrudes beyond the first connecting piece and the second connecting piece in the first direction; the composite pole is connected to the first connecting piece through the first through hole, and is connected to the second connecting piece through the second through hole.

[0009] In the above implementation process, the connector of the embodiment of the present application utilizes the through-hole design of the first connecting plate and the second connecting plate, as well as the intermediate connecting hole on the substrate. The composite pole passes through the first through-hole, the second through-hole and the intermediate connecting hole, and can be connected to the positive pole tab / negative pole tab of two adjacent bare battery cells to achieve the connection between the two adjacent bare battery cells; due to the setting of the intermediate connector, the battery cell provided in the embodiment of the present application is not arranged horizontally and vertically between the bare battery cells, and it can also ensure that the battery cell has good connection stability and conductive efficiency.

[0010] Optionally, in an embodiment of the present application, the first connecting plate and the second connecting plate are respectively made of one of a first conductive material and a second conductive material; the material of the first connecting side of the composite pole is consistent with that of the first connecting plate, and the material of the second connecting side of the composite pole is consistent with that of the second connecting plate.

[0011] In the above implementation process, by using different conductive materials in the design of the first connecting piece, the second connecting piece and the composite pole, and ensuring that the materials at both ends of the composite pole are consistent with the corresponding connecting pieces, the matching and conductive performance of the electrical connection are significantly improved.

[0012] Optionally, in an embodiment of the present application, the first connection part also includes a first insulating cover having a first connection hole, and the second connection part also includes a second insulating cover having a second connection hole; the composite pole is connected to the first bare battery cell through the first connection hole, and the composite pole is connected to the second bare battery cell through the second connection hole.

[0013] In the above implementation process, this embodiment significantly improves the insulation performance and safety of the battery cell by introducing an insulating cover and connection hole at the connection part. The connection between the composite pole and the bare cell is safer and more reliable, avoiding potential short circuit and leakage risks. The overall structural design improves the reliability and electrical performance of the battery cell, while optimizing thermal management and further enhancing the safety and stability of the battery in various application scenarios.

[0014] Optionally, in an embodiment of the present application, the first connecting portion further includes a first sealing ring, and the second connecting portion further includes a second sealing ring; the first sealing ring is arranged between the first connecting surface of the substrate and the composite pole, and the second sealing ring is arranged between the second connecting surface of the substrate and the composite pole.

[0015] In the above implementation process, this embodiment significantly enhances the sealing performance and protection capability of the battery cell by introducing the first sealing ring and the second sealing ring into the connector; effectively prevents the external environment from affecting the interior of the battery, and improves the safety and reliability of the battery.

[0016] Optionally, in an embodiment of the present application, the edge of the first insulating cover protrudes from the first surface of the first insulating cover, forming a first protective cavity with the first surface of the first insulating cover; the edge of the second insulating cover protrudes from the first surface of the second insulating cover, forming a second protective cavity with the first surface of the second insulating cover; the first protective cavity is configured to protect the connection area between the first bare battery cell and the composite pole, and the second protective cavity is configured to protect the connection area between the second bare battery cell and the composite pole.

[0017] In the above implementation process, the battery cells provided by the embodiments of the present application are formed by folding the edges of the first and second insulating covers toward the cell to form a first and second protective cavity. The presence of the protective cavity improves the safety of the connection area, reducing the possibility of battery performance degradation or safety accidents caused by poor connection.

[0018] Optionally, in an embodiment of the present application, the battery cell further includes a first shell and a second shell; the first shell is sleeved on the outside of the first bare battery cell, and the second shell is sleeved on the outside of the second bare battery cell; the first end of the first shell is connected to the first insulating cover, and the second end of the second shell is connected to the second insulating cover.

[0019] In the above implementation process, the battery cells in this embodiment provide additional mechanical protection for the bare cells by providing the first and second shells, preventing damage to the cells from external environmental factors (such as impact and vibration). Furthermore, the connection between the shell and the insulating cover ensures stable packaging of the cells and connectors, enhancing the overall structural strength and stability of the battery.

[0020] Optionally, in an embodiment of the present application, the battery cell further includes an end cover having an explosion-proof valve and an injection hole; the end cover is arranged on two end faces in the first direction after the multiple bare battery cells are connected; the explosion-proof valve is configured to pass gas, and the injection hole is configured to inject electrolyte into the bare battery cell through the injection hole.

[0021] In the above implementation process, this embodiment significantly enhances battery safety and ease of electrolyte injection by providing explosion-proof valves and injection holes on the end caps of the battery cells. The explosion-proof valve effectively reduces the risk of explosion caused by excessive internal pressure, while the injection hole ensures the injection of electrolyte.

[0022] Optionally, in an embodiment of the present application, the battery cell further includes a protective bracket; the protective bracket is disposed between the end cover and the bare cell and is configured to protect the bare cell.

[0023] In the above implementation process, this embodiment can prevent external impact and extrusion from causing damage to the battery cell by providing a protective bracket between the bare battery cell and the end cover, thereby enhancing the stability and safety of the overall structure.

[0024] In a second aspect, an embodiment of the present application provides a battery pack, comprising: a pack body and a battery cell; a plurality of battery cells are stacked in the pack body along a second direction; wherein the battery cell comprises a battery cell as described in any one of the first aspects of the present application.

[0025] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the following embodiments are given in conjunction with the accompanying drawings for detailed description as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 An exploded diagram of the battery cell structure provided in an embodiment of the present application;

[0028] Figure 2 An exploded view of the connector structure provided in an embodiment of the present application;

[0029] Figure 3 A top view and an AA cross-sectional view of a connector provided in an embodiment of the present application;

[0030] Figure 4 Another exploded view of the battery cell structure provided by an embodiment of the present application;

[0031] Figure 5 A schematic diagram of the structure of the battery pack provided for the implementation of this application;

[0032] Figure 6 A flowchart of the manufacturing process of a battery cell according to an embodiment of the present application;

[0033] Reference numerals: battery cell 1000; bare cell 100; first bare cell 110; second end 110b of the first bare cell; second bare cell 120; first end 120a of the second bare cell; connector 200; first connector 210; first connector surface 210a of the first connector; second connector surface 210b of the first connector; second connector 220; second connector surface 220b of the second connector; first connector surface 220a of the second connector; substrate 230; first connector surface 230a of the substrate; second connector surface 230b of the substrate; composite pole 240; first connector surface of the composite pole Side 240a; second connection side 240b of the composite pole; middle connection hole O3; first connection piece 211; first through hole O1; second connection piece 231; second through hole O2; first insulating cover 212; second insulating cover 221; first connection hole O4; second connection hole O5; first sealing ring 213; second sealing ring 222; first protective cavity 214; second protective cavity 223; first shell 310; second shell 320; first end 310a of the first shell; second end 320b of the second shell; end cover 400; explosion-proof valve 410; injection hole 420; bracket 500. DETAILED DESCRIPTION

[0034] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0036] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0037] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is typically placed when in use. These terms are intended solely to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0038] Furthermore, terms such as "horizontal" and "vertical" do not necessarily mean that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0039] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0040] Batteries are crucial in the new energy sector. They are central to the storage and release of electrical energy, impacting the performance and range of electric vehicles and energy storage systems. Batteries not only effectively store renewable energy but also deliver it smoothly, reducing reliance on fossil fuels and driving the transition to a more sustainable energy structure. Therefore, the development of battery technology is crucial to the widespread adoption of new energy and the reduction of carbon emissions.

[0041] To improve overall pack space utilization, battery designs are moving toward longer cells. This increased cell length allows for more efficient use of limited space within the battery pack, thereby increasing energy density. This trend is primarily driven by the increasing demands for battery capacity and range in the new energy sector, particularly electric vehicles. By lengthening the cell, more battery material can be packed into the limited space within the vehicle, increasing energy storage and extending the vehicle's range.

[0042] When the cell length is between 500 and 650 mm, the battery pack design allows for two cells to be arranged in the Y direction. This design provides higher energy storage without significantly increasing the length of the individual cells. However, the battery pack typically requires internal crossbeams and longitudinal beams for structural support, which takes up a certain amount of space and reduces the effective space utilization in the Y direction.

[0043] Existing technologies also extend individual cells to 900 to 1300 mm, so that only one cell is required for Y-axis layout. By reducing the number of cells and reducing reliance on the horizontal and vertical beam structures, space utilization can be further improved and the total energy capacity of the battery pack can be increased. However, long cells face problems such as difficult production processes, low production yields, poor manufacturability, and weak fast-charging capabilities.

[0044] The manufacturing of long cells requires greater precision and control. In key processes like coating, winding, and packaging, longer cells are more susceptible to deformation and uneven thickness, increasing production challenges. Material handling, venting, and packaging for longer cells require new equipment and technical support.

[0045] Long cells are more prone to quality defects during production, such as uneven material distribution and significant variations in coating thickness. This leads to poor product consistency and ultimately affects production yields. Even the slightest error in the manufacturing process can render the entire cell inoperable, wasting materials and labor.

[0046] Longer cells require more sophisticated equipment and production lines, potentially requiring significant adjustments to existing equipment to accommodate the new dimensions. Furthermore, the assembly, transportation, and installation of longer cells present greater challenges. The handling and processing of cells during the manufacturing process is more complex, increasing production costs and complexity.

[0047] Longer cells have a longer current path than shorter cells, increasing internal resistance and limiting their fast-charging capabilities. During fast charging, current distribution within the cell can be uneven, leading to overheating or overcharging in some areas, compromising charging speed and safety. Therefore, while longer cells can increase the energy density of a battery pack, they sacrifice charging speed and efficiency, making it difficult to achieve both fast-charging performance and efficiency.

[0048] Based on this, embodiments of the present application provide a battery cell and battery pack. The battery cell is composed of two medium-length bare cells connected in series, with a connector provided in between. The overall design eliminates the need for horizontal and vertical beams between the two bare cells, improving the overall space utilization of the pack along the length of the cells. Furthermore, the battery pack has high structural strength, strong fast-charging capability, simple production process, and high manufacturability.

[0049] Please see Figure 1 and Figure 2 , Figure 1An exploded diagram of the battery cell structure provided in an embodiment of the present application; Figure 2 This is an exploded view of the connector structure provided in an embodiment of the present application; the battery cell 1000 provided in an embodiment of the present application includes at least two bare cells 100, a connector 200, and the connector 200 includes a first connecting part 210, a second connecting part 220, a substrate 230 and a composite pole 240.

[0050] The first connection surface 210a of the first connection portion is connected to the second end 110b of the first bare cell in the adjacent bare cell 100 , and the second connection surface 220b of the second connection portion is connected to the first end 120a of the second bare cell in the adjacent bare cell 100 .

[0051] The second connection surface 210b of the first connection portion is connected to the first connection surface 230a of the substrate, and the first connection surface 220a of the second connection portion is connected to the second connection surface 230b of the substrate.

[0052] The composite pole 240 passes through the substrate 230 and connects the first connecting portion 210 and the second connecting portion 220 .

[0053] In the above implementation, two adjacent bare cells 100 are connected by a connector 200. The first connecting portion 210 and the second connecting portion 220 of the connector 200 are connected to different ports of the adjacent bare cells 100, respectively, enhancing the overall stability of the battery. The substrate 230 provides support during the connection, while the composite pole 240 ensures efficient current transmission.

[0054] In the embodiment of the present application, the composite pole 240 provides a path for current to be transmitted from one battery cell to another, ensuring smooth energy flow of the battery and achieving connection between adjacent battery cells 1000.

[0055] It should be noted that the embodiments of the present application use bare cells 100 with a length between 500 and 650 mm. The connection of two bare cells 100 through a connector 200 to form a battery cell 1000 is merely exemplary. The length of the battery cell 1000 formed by two bare cells 100 is between 900 and 1300 mm, the height is between 70 and 140 mm, and the thickness is between 12 and 36 mm. In some possible embodiments, in order to further increase the length of the battery, the number of bare cells 100 can be increased, and adjacent bare cells 100 can be connected using connectors 200.

[0056] pass Figure 1It can be seen that the battery cell 1000 structure connects adjacent bare cells 100 through connectors 200, forming a longer battery cell 1000 (between 900 and 1300 mm). Due to the provision of the connector 200 in the embodiment of the present application, the connection stability and overall performance between the cells are improved, which helps to improve the safety and energy efficiency of the battery. When the battery cell 1000 is packed, there is no need to set up horizontal and vertical beams, which further improves space utilization. The structure has high strength, strong fast charging capability, simple production process, and high manufacturability.

[0057] Please see Figure 2 , Figure 2 This is an exploded view of the structure of the connector 200 provided in an embodiment of the present application; the first connecting portion 210 provided in an embodiment of the present application includes a first connecting piece 211 having a first through hole O1, the second connecting portion 220 includes a second connecting piece 231 having a second through hole O2, and the substrate 230 includes an intermediate connecting hole O3.

[0058] The composite pole 240 passes through the middle connection hole O3, the first through hole O1, and the second through hole O2, and protrudes in the first direction from the first connection piece 211 and the second connection piece 231. The composite pole 240 is connected to the first connection piece 211 through the first through hole O1 and to the second connection piece 231 through the second through hole O2.

[0059] like Figure 2 As shown, in the battery cell 1000 structure provided in the embodiment of the present application, the first through hole O1, the second through hole O2, and the middle connection hole O3 are overlapped in the first direction (the length direction of the bare battery cell 100) and can pass through the composite pole 240.

[0060] In the above implementation process, the composite pole 240 passes through the first connecting piece 211 and the second connecting piece 231 in order to achieve a good connection with the positive electrode tab / negative electrode tab of the bare battery cell 100 .

[0061] pass Figure 2 It can be seen that the connector 200 of the embodiment of the present application utilizes the through-hole design of the first connecting piece 211 and the second connecting piece 231, as well as the intermediate connecting hole O3 on the substrate 230. The composite pole 240 passes through the first through-hole O1, the second through-hole O2 and the intermediate connecting hole O3, and can be connected to the positive pole tab / negative pole tab of two adjacent bare battery cells 100, thereby realizing the connection between two adjacent bare battery cells 100; due to the setting of the intermediate connector 200, the battery cell 1000 provided in the embodiment of the present application is not arranged horizontally and vertically between the bare battery cells 100, and can also ensure that the battery cell 1000 has good connection stability and conductive efficiency.

[0062] In an optional embodiment, the first connecting piece 211 and the second connecting piece 231 are respectively made of one of a first conductive material and a second conductive material. The material of the first connecting side 240a of the composite pole is consistent with the first connecting piece 211, and the material of the second connecting side 240b of the composite pole is consistent with the second connecting piece 231.

[0063] The first conductive material can be copper, aluminum, or other highly conductive metal materials, and the second conductive material is different from the first conductive material. The first connection side 240a of the composite pole uses the same first conductive material as the first connecting piece 211 to ensure conductivity consistency and current conduction efficiency when in contact with the first connecting piece 211. The second connection side 240b of the composite pole uses the same second conductive material as the second connecting piece 231 to achieve matching with the second connecting piece 231. For example, if the material of the first connecting piece 211 is copper, the material of the first connection side 240a of the composite pole is also copper; if the material of the second connecting piece 231 is aluminum, the material of the second connection side 240b of the composite pole is also aluminum.

[0064] It should be noted that the connection between the first connection side 240a of the composite pole and the second connection side 240b of the composite pole may be riveted or laser welded.

[0065] It can be seen that by using different conductive materials in the design of the first connecting piece 211, the second connecting piece 231 and the composite pole 240, and ensuring that the materials at both ends of the composite pole 240 are consistent with the corresponding connecting pieces, the matching and conductive performance of the electrical connection are significantly improved.

[0066] Please continue to see Figure 2 In an optional embodiment, the first connection portion 210 further includes a first insulating cover 212 having a first connection hole O4, and the second connection portion 220 further includes a second insulating cover 221 having a second connection hole O5.

[0067] The composite pole 240 is connected to the first bare cell 110 through the first connection hole O4 , and the composite pole 240 is connected to the second bare cell 120 through the second connection hole O5 .

[0068] In the above implementation process, the first insulating cover 212 and the second insulating cover 221 are both provided with connection holes, namely the second connection hole O5 and the second connection hole O5, to ensure that the composite pole 240 can pass through the first connection hole O4 and the second connection hole O5 and be securely connected to the first bare cell 110 and the second bare cell 120, respectively. It should be noted that the material selected for the first insulating cover 212 and the second insulating cover 221 should be an insulating material with high temperature and voltage resistance, such as polymer or ceramic, to prevent short circuits and leakage.

[0069] As can be seen, this embodiment significantly improves the insulation performance and safety of the battery cell 1000 by introducing an insulating cover and connection holes at the connection portion. The connection between the composite terminal 240 and the bare cell 100 is safer and more reliable, avoiding potential short circuit and leakage risks. The overall structural design improves the reliability and electrical performance of the battery cell 1000, further enhancing the safety and stability of the battery in various application scenarios.

[0070] Please Figure 2 See the basis of Figure 3 , Figure 3 The top view and AA cross-sectional view of the connector 200 provided in an embodiment of the present application are shown. In this embodiment of the present application, the first connecting portion 210 further includes a first sealing ring 213, and the second connecting portion 220 further includes a second sealing ring 222. The first sealing ring 213 is disposed between the first connecting surface 230a of the substrate and the composite pole 240, and the second sealing ring 222 is disposed between the second connecting surface 230b of the substrate and the composite pole 240.

[0071] The first sealing ring 213 is located between the first connecting surface 230a of the substrate and the composite pole 240 to ensure that a seal is formed at the interface of the first connecting portion 210; the second sealing ring 222 is arranged between the second side of the substrate 230 and the composite pole 240. The arrangement of the first sealing ring 213 and the second sealing ring 222 can prevent the external environment (such as moisture, dust, etc.) from invading the interior of the battery cell 1000.

[0072] It should be noted that, in the embodiment of the present application, the first sealing ring 213 and the second sealing ring 222 are generally made of high-temperature resistant and chemical corrosion-resistant materials, such as silicone or rubber, which can withstand the heat and chemical reactions generated when the battery is working, and ensure the sealing performance during long-term use.

[0073] It can be seen that this embodiment significantly enhances the sealing performance and protection capability of the battery cell 1000 by introducing the first sealing ring 213 and the second sealing ring 222 into the connector 200; effectively prevents the external environment from affecting the interior of the battery, and improves the safety and reliability of the battery.

[0074] Please continue to see Figure 2 In an optional embodiment, the edge of the first insulating cover 212 protrudes from the first surface of the first insulating cover 212 and forms a first protection cavity 214 with the first surface of the first insulating cover 212. The edge of the second insulating cover 221 protrudes from the first surface of the second insulating cover 221 and forms a second protection cavity 223 with the first surface of the second insulating cover 221.

[0075] The first protection cavity 214 is configured to protect the connection area between the first bare cell 110 and the composite pole 240 , and the second protection cavity 223 is configured to protect the connection area between the second bare cell 120 and the composite pole 240 .

[0076] In the above implementation, the edge protrusion of the first insulating cover 212 is formed to specifically protect the connection area between the first bare cell 110 and the composite pole 240. Furthermore, the edge protrusion of the second insulating cover 221 similarly protects the connection area between the second bare cell 120 and the composite pole 240, ensuring the stability and reliability of the connection area.

[0077] As can be seen, the battery cell 1000 provided in this embodiment of the present application is formed by folding the edges of the first insulating cover 212 and the second insulating cover 221 toward the cell to form a first protective cavity 214 and a second protective cavity 223. The presence of the protective cavity improves the safety of the connection area, reducing the possibility of battery performance degradation or safety accidents caused by poor connection.

[0078] Please see Figure 4 , Figure 4 This is another exploded view of the battery cell 1000 structure provided in an embodiment of the present application; the battery cell 1000 further includes a first shell 310 and a second shell 320 .

[0079] The first shell 310 is sleeved on the outside of the first bare cell 110, and the second shell 320 is sleeved on the outside of the second bare cell 120; the first end 310a of the first shell is connected to the first insulating cover 212, and the second end 320b of the second shell is connected to the second insulating cover 221.

[0080] In the above implementation process, the first shell 310 is sleeved on the outside of the first bare cell 110, and its function is to provide mechanical protection for the first bare cell 110 to prevent damage to the cell due to external impact, vibration or environmental factors. The first end 310a of the first shell is connected to the first insulating cover 212 to ensure that the cell and the cover are tightly packaged, further improving the structural strength and stability of the battery. The second shell 320 is also sleeved on the outside of the second bare cell 120 to protect the second bare cell 120 from physical damage; the second connection end of the second shell 320 is connected to the second insulating cover 221 to ensure that the second bare cell 120 is firmly packaged and closely matches the structure of the connector 200.

[0081] It should be noted that, in the embodiment of the present application, the material of the first shell 310 and the second shell 320 can be aluminum; a composite material can also be used, for example, a metal shell is used on the outer layer to enhance protection, and an insulating material is used inside to provide electrical isolation.

[0082] pass Figure 4As can be seen, the battery cell 1000 in this embodiment provides additional mechanical protection for the bare cell 100 by providing the first shell 310 and the second shell 320, preventing damage to the cell from external environmental factors (such as impact and vibration). Furthermore, the connection between the shell and the insulating cover ensures stable packaging of the cell and the connector 200, enhancing the overall structural strength and stability of the battery.

[0083] Please continue to see Figure 4 The battery cell 1000 provided in the embodiment of the present application further includes an end cover 400 having an explosion-proof valve 410 and a liquid injection hole 420;

[0084] The end caps 400 are disposed on two end surfaces in the first direction after the plurality of bare cells 100 are connected.

[0085] The explosion-proof valve 410 is configured to pass gas, and the injection hole 420 is configured to inject electrolyte into the bare battery cell 100 through the injection hole 420 .

[0086] In the above implementation, explosion-proof valve 410 is provided on end cap 400 to release gas generated by overpressure inside the battery. In this embodiment of the present application, explosion-proof valve 410 is provided on end cap 400 to effectively prevent explosions caused by gas accumulation in the event of battery abnormalities, particularly high temperatures or overcharging. This allows for timely pressure release, reduces explosion risks, and improves safety.

[0087] Electrolyte can be injected into the bare cell 100 through the hole to ensure that the battery maintains optimal performance during use, or replenishing the electrolyte can extend the battery life and optimize the electrochemical reaction. The electrolyte can be injected into the bare cell 100 from both ends at the same time.

[0088] As can be seen, this embodiment significantly enhances battery safety and ease of electrolyte injection by providing an explosion-proof valve 410 and an injection port 420 on the end cap 400 of the battery cell 1000. The explosion-proof valve 410 effectively reduces the risk of explosion due to excessive internal pressure, while the injection port 420 ensures the injection of electrolyte.

[0089] Please continue to see Figure 4 The battery cell 1000 provided in the embodiment of the present application further includes a protective bracket 500 ; the protective bracket 500 is disposed between the end cover 400 and the bare cell 100 and is configured to protect the bare cell 100 .

[0090] The protective bracket 500 of the present embodiment is located between the end cap 400 and the bare cell 100, providing additional mechanical support for the cell. It absorbs and disperses external impact forces, reducing direct pressure on the bare cell 100 and thus preventing physical damage. The presence of the protective bracket 500 enhances the overall structural stability of the battery cell 1000, preventing displacement or damage to the cell during assembly or use, and ensuring stable battery performance.

[0091] It can be seen that this embodiment can prevent external impact and extrusion from causing damage to the bare battery cell 100 and enhance the stability and safety of the overall structure by providing a protective bracket 500 between the bare battery cell 100 and the end cover 400.

[0092] Please see Figure 5 , Figure 5 A schematic structural diagram of a battery pack provided for the implementation of this application; This application provides a battery pack, the battery pack comprising: a pack body and a battery cell 1000.

[0093] The plurality of battery cells 1000 are arranged along the second direction ( Figure 5 The battery cells 1000 are stacked in the package in the X direction; wherein the battery cells 1000 are the above-mentioned battery cells 1000.

[0094] pass Figure 5 As can be seen, the battery pack provided by this application is based on the battery cell 1000 proposed in the embodiments of this application and adopts a compact design without horizontal and vertical beams. This significantly improves the space utilization inside the battery pack, reduces the gap between the battery cell and the surrounding side walls of the pack, and optimizes the internal layout. This not only increases the capacity of the battery pack and the energy density of the battery, but also significantly improves the overall strength of the battery pack by reducing redundant structural components, enhancing its durability and stability. At the same time, the compact structural layout also reduces the overall weight, improving the practicality of the battery pack in various application scenarios.

[0095] This application also provides a method for manufacturing a battery cell, see Figure 6 , Figure 6 A manufacturing flow chart of a battery cell provided in an embodiment of the present application; the manufacturing method of the battery cell includes:

[0096] Step S1: providing a first bare battery cell and a connector, and welding a copper tab of the first bare battery cell to a first connecting piece made of copper connected to the connector.

[0097] Step S2: Provide a protective bracket, a first shell and an end cover, pass the aluminum tab of the first bare battery cell through the protective bracket, wrap and fix it with Mylar, pass it through the first shell, and then weld the aluminum tab of the first bare battery cell to the end cover.

[0098] Step S3: providing a second bare battery cell, and connecting the aluminum tab of the second bare battery cell to a second connecting piece whose connecting material is aluminum.

[0099] Step S4: Provide another protective bracket, a second aluminum shell and another end cover, pass the copper tab of the second bare battery cell through the other protective bracket, wrap and fix it with Mylar, pass it through the second shell, and then weld the copper tab of the second bare battery cell to the end cover to form a closed whole consisting of two bare batteries connected in series.

[0100] In summary, the embodiments of the present application improve the overall space utilization and structural strength of the battery pack by connecting at least two bare cells through connectors to form a single battery, using connecting plates and composite poles made of different conductive materials, and compactly stacking multiple battery cells in the package. The introduction of explosion-proof valves enhances safety, ensuring the effective release of gas under high-pressure conditions to prevent potential dangers. In addition, the elimination of traditional crossbeam and longitudinal beam structures reduces the number of components, further improving the energy density and production efficiency of the battery pack, and ensuring that the battery has better safety and stability while maintaining high performance and long life.

[0101] The above are merely examples of the present application and are not intended to limit the scope of protection of the present application. Those skilled in the art will appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery cell, characterized in that: The battery cell comprises: at least two bare cells and a connector; the connector comprises a first connector, a second connector, a substrate and a composite pole; The first connection surface of the first connection portion is connected to the second end of a first bare cell among adjacent bare cells, and the second connection surface of the second connection portion is connected to the first end of a second bare cell among the adjacent bare cells; The second connection surface of the first connection portion is connected to the first connection surface of the substrate, and the first connection surface of the second connection portion is connected to the second connection surface of the substrate; The composite pole passes through the substrate and connects the first connection portion and the second connection portion.

2. The battery cell according to claim 1, wherein: The first connecting portion includes a first connecting piece having a first through hole, the second connecting portion includes a second connecting piece having a second through hole, and the substrate includes a middle connecting hole; The composite pole passes through the middle connecting hole, the first through hole and the second through hole, and protrudes from the first connecting piece and the second connecting piece in the first direction; The composite pole is connected to the first connecting piece through the first through hole, and is connected to the second connecting piece through the second through hole.

3. The battery cell according to claim 2, characterized in that: The first connecting piece and the second connecting piece are respectively made of one of a first conductive material and a second conductive material; The material of the first connection side of the composite pole is consistent with that of the first connection piece, and the material of the second connection side of the composite pole is consistent with that of the second connection piece.

4. The battery cell according to claim 2, characterized in that: The first connecting portion further comprises a first insulating cover having a first connecting hole, and the second connecting portion further comprises a second insulating cover having a second connecting hole; The composite pole is connected to the first bare cell through the first connection hole, and the composite pole is connected to the second bare cell through the second connection hole.

5. The battery cell according to claim 4, characterized in that The first connecting portion further includes a first sealing ring, and the second connecting portion further includes a second sealing ring; The first sealing ring is arranged between the first connection surface of the substrate and the composite pole, and the second sealing ring is arranged between the second connection surface of the substrate and the composite pole.

6. The battery cell according to claim 4, characterized in that The edge of the first insulating cover protrudes from the first surface of the first insulating cover, and forms a first protective cavity with the first surface of the first insulating cover; The edge of the second insulating cover protrudes from the first surface of the second insulating cover, and forms a second protective cavity with the first surface of the second insulating cover; The first protection cavity is configured to protect the connection area between the first bare battery cell and the composite pole, and the second protection cavity is configured to protect the connection area between the second bare battery cell and the composite pole.

7. The battery cell according to claim 6, characterized in that The battery cell further includes a first shell and a second shell; The first shell is sleeved on the outside of the first bare cell, and the second shell is sleeved on the outside of the second bare cell; The first end of the first shell is connected to the first insulation cover, and the second end of the second shell is connected to the second insulation cover.

8. The battery cell according to claim 1, wherein: The battery cell further includes an end cap having an explosion-proof valve and a liquid injection hole; The end caps are provided on two end surfaces in the first direction after the plurality of bare cells are connected; The explosion-proof valve is configured to pass gas, and the injection hole is configured to inject electrolyte into the bare battery cell through the injection hole.

9. The battery cell according to claim 8, characterized in that The battery cell further includes a protective bracket; The protective bracket is disposed between the end cover and the bare cell and is configured to protect the bare cell.

10. A battery pack, characterized in that: The battery pack includes: a pack body and a battery cell; A plurality of battery cells are stacked in the package along a second direction; wherein the battery cells include the battery cells according to any one of claims 1 to 9.

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