Battery monomer and processing method thereof, battery and power-consuming device

Abstract

A battery cell and its processing method, a battery, and an electrical device, belonging to the field of battery technology. The battery cell includes a shell component, a pole component, and a cell component. The shell component has a receiving cavity and includes a first shell wall that helps define the receiving cavity. The pole component is mounted on the first shell wall and includes a pole body. The cell component includes at least one cell group. The cell group includes n cell bodies. The n cell bodies are all arranged in the receiving cavity and arranged in sequence along a first direction. The end of each cell body is connected to a tab group. All tab groups of the cell group extend toward the middle position of the cell group in the first direction and are connected to form a tab portion. The tab portion is electrically connected to the pole body. n ≥ 1 and is a positive integer. In this way, the reliability of the battery cell can be improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell and a processing method thereof, a battery, and an electrical device. Background Art

[0002] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role.

[0003] In the related art, a power battery includes a battery cell. The tabs of the battery cell need to be electrically connected to the poles. The arrangement of the tabs usually affects the reliability of the battery cell and needs further improvement. Summary of the Invention

[0004] The embodiments of the present application provide a battery cell and a processing method thereof, a battery, and an electrical device, which can improve the reliability of the battery cell.

[0005] In the first aspect, an embodiment of the present application provides a battery cell, comprising: a shell component, having a accommodating cavity and including a first shell wall that participates in defining the accommodating cavity; a pole component, installed on the first shell wall and including a pole body; a battery cell component, including at least one group of battery cell groups, the battery cell group including n battery cell bodies, the n battery cell bodies are all arranged in the accommodating cavity, and are arranged in sequence along the first direction, the end of each battery cell body is connected to a pole lug group, all the pole lug groups of the battery cell group extend toward the middle position of the battery cell group in the first direction and are connected to form a pole lug portion, the pole lug portion is electrically connected to the pole body, and n ≥ 1 and is a positive integer.

[0006] In the above technical solution, all the tab groups of the battery cell group extend toward the middle position of the battery cell group in the first direction and are connected to form a tab portion. On the one hand, there is only one tab portion. Compared with multiple folding in batches, the one-time folding process is simple and the cost is lower. Moreover, compared with multiple folding in batches, the folding process does not need to consider the number of battery cell bodies. Regardless of the number of battery cell bodies, they can all be folded directly at one time. On the other hand, folding in the center to form a tab portion can shorten the average length of multiple tab sheets in the tab group compared to offset folding, thereby improving the redundancy of the tab group and reducing the risk of the tab group being invertedly inserted into the battery cell body or invertedly inserted into the root position of the tab group connected to the battery cell body. At the same time, it is beneficial to improve problems such as wrinkling, bending and breaking of the tab sheets of the tab group, thereby improving the reliability of the battery cell.

[0007] In some embodiments, the midpoint of the battery cell group in the first direction is the midpoint of the middle position, and in the first direction, the size of the middle position is less than or equal to 1 / 2 of the size of a battery cell body.

[0008] In the above technical solution, the middle position is not the midpoint in the absolute sense. The middle position is a small area formed around the midpoint. This setting can take into account different assembly requirements and usage requirements while shortening the length of the tab group, which is conducive to reducing assembly requirements and improving the applicability and practicality of battery cells.

[0009] In some embodiments, the battery cell includes m groups of battery cells, where m≥1 and is a positive integer, m=1 and n=1; or, at least one of m and n is greater than or equal to 2.

[0010] In the above technical solution, by setting the number of battery cell groups and the number of battery cell bodies in the battery cell groups, it is easy to achieve flexible and diversified structural design of battery cells, which is conducive to improving the applicability and practicality of battery cells.

[0011] In some embodiments, the number of battery cell bodies in at least one battery cell group is an odd number; and / or the number of battery cell bodies in at least one battery cell group is an even number.

[0012] In the above technical solution, generally speaking, when the number of cell bodies in a cell group exceeds two, if the number of cell bodies is an odd number, it is impossible to individually fold the two sides of the multiple cell bodies. Therefore, by folding the middle part at once, the odd number of cell bodies can be folded at once. The same applies to cell groups with an even number of cell bodies. Therefore, this arrangement facilitates the realization of diversified connection arrangements of the cell bodies within the battery cells, facilitates the structural flexibility and diversification of the battery cells, and is conducive to improving the applicability and practicality of the battery cells.

[0013] In some embodiments, the battery cell includes m groups of battery cell groups sequentially arranged along a first direction, where m is greater than or equal to 2 and is a positive integer, and the number of battery cell bodies in the multiple groups of battery cell groups is equal or different.

[0014] In the above technical solution, the design of the battery cell group is flexible, which is convenient for improving the applicability and practicality of the battery cells.

[0015] In some embodiments, the battery core component further includes a transition piece, and the pole ear portion is electrically connected to the pole body via the transition piece.

[0016] In the above technical solution, the pole ear and the pole body are indirectly connected through an adapter, which can shorten the length of the pole ear and improve problems such as wrinkling, bending and breaking of the pole ear. In addition, the shape and material of the adapter can be flexibly designed to reduce the difficulty of connection with the pole body and improve the convenience of connection between the adapter and the pole body.

[0017] In some embodiments, the adapter includes a main structure and multiple branch structures, the main structure is connected to the pole body, each branch structure is connected to an end of the main structure away from the pole body, and includes at least one level of branch segment, so that the adapter is constructed into a fractal tree structure, and each last level branch segment of the branch structure is connected to a pole ear portion.

[0018] In the above technical solution, by setting the adapter to be constructed into a fractal tree structure, the adapter can facilitate the electrical connection between all battery cell bodies and the pole body, and the adapter can connect a larger number of battery cell bodies, and the space occupied by the adapter is relatively small.

[0019] In some embodiments, the adapter includes a first connecting portion, a bending portion and a second connecting portion, the first connecting portion and the second connecting portion are opposite to each other, the bending portion is bent and connected between the first connecting portion and the second connecting portion, and at least a portion of the second connecting portion is constructed into multiple branch structures.

[0020] In the above technical solution, a bending portion is provided to be bent and connected between the first connecting portion and the second connecting portion, and at least a portion of the second connecting portion is constructed into multiple branch structures, so that all the tab groups are electrically connected to the same pole body, the structure of the adapter is simplified, and the bent adapter can play the role of a buffer support, which is beneficial to reduce the risk of the battery core components colliding with the shell components and improve the reliability of the battery cell.

[0021] In some embodiments, the connection position between the main structure and the branch structure is located in the middle of the m groups of battery cells in the first direction.

[0022] In the above technical solution, by setting the connection position between the main structure and the branch structure at the middle position of all battery cell groups in the first direction, it is convenient to shorten the length of the branch structure while reliably supporting the tab group, which is beneficial to reducing the space occupied by the adapter.

[0023] In some embodiments, the extension length of the adapter is L1, L1>b+λ / 2, b is the extension length of the portion of the adapter connected to the pole ear portion, the pole body has a welding surface, a portion of the welding surface is welded to the adapter, and λ is the size of the welding surface in the first direction.

[0024] In the above technical solution, by setting the extension length L1 of the adapter to be greater than a+λ / 2, the adapter and the pole lug portion have a larger connection length, and the adapter and the pole body have a larger connection length, so as to achieve reliable electrical connection between the pole lug group and the pole body.

[0025] In some embodiments, L1 ≥ b + λ / 2 + W / 2, where W is the dimension of the pole component in the first direction.

[0026] In the above technical solution, by setting the extension length L1 of the adapter ≥ b + λ / 2 + W / 2, it is convenient to further make the adapter and the pole ear have a longer connection length, and the adapter and the pole body have a longer connection length, thereby improving the connection reliability between the pole ear group and the pole body.

[0027] In some embodiments, all the tab groups of the battery cell group, or the conductive parts formed after the tab parts are connected to the adapter, are bent to form an open slot; or, all the tab groups of the battery cell group, or the conductive parts formed after the tab parts are connected to the adapter, are bent to form multiple open slots, and the multiple open slots are arranged in sequence from the battery cell body toward the pole column component, and the opening directions of two adjacent open slots are arranged at an angle.

[0028] In the above technical solution, by bending the conductive portion to form at least one open groove, the conductive portion can play a role of buffer support, which is beneficial to reducing the risk of the battery core component colliding with the shell component and improving the reliability of the battery cell.

[0029] In some embodiments, the end of the adapter away from the pole body has a clamping structure, the clamping structure includes two oppositely arranged clamping parts, the pole ear is clamped between the two clamping parts, and is connected to each clamping part.

[0030] In the above technical solution, by sandwiching the tab portion between the two clamping portions, the two clamping portions can be used to limit the tab portion, which is beneficial to improving the connection reliability of the multiple tabs of the tab group at the tab portion. At the same time, it is convenient to use one of the two clamping portions, which is located adjacent to the battery cell body, to support the tab portion, and support it on the side of the tab portion away from the pole body to prevent the free end of the tab group from moving toward the battery cell body, thereby reducing the risk of reverse insertion. In addition, the two clamping portions can protect the tab portion, thereby reducing the risk of the tab pieces of the tab portion being easily cracked due to thin thickness, etc., which is beneficial to improving the welding quality between the tab group and the adapter and improving the connection reliability of the tab group and the adapter.

[0031] In some embodiments, the adapter includes a first connecting portion, a bending portion and a second connecting portion. The first connecting portion and the second connecting portion are opposite to each other, the bending portion is bent and connected between the first connecting portion and the second connecting portion, the first connecting portion is connected to the pole body, and the second connecting portion is connected to the pole ear.

[0032] In the above technical solution, the bent adapter can play a role of buffer support while achieving reliable support for the free end of the tab group, which is beneficial to reducing the risk of the battery cell components colliding with the shell components and improving the reliability of the battery cell.

[0033] In some embodiments, the thickness of the bending portion is smaller than the thickness of at least one of the first connecting portion and the second connecting portion; and / or, in the extension direction of the central axis of the bending portion, the width of the bending portion is smaller than the width of at least one of the first connecting portion and the second connecting portion.

[0034] In the above technical solution, the thickness of the bending portion is set to be smaller than the thickness of at least one of the first connection portion and the second connection portion, and the width of the bending portion is set to be smaller than the width of at least one of the first connection portion and the second connection portion, so that the first connection portion and the second connection portion have a certain rigidity respectively by reducing the thickness and shortening the width of the bending portion, thereby realizing a reliable connection between the adapter and the pole body, and a reliable connection between the adapter and the tab group. At the same time, the bending portion is weakened, which facilitates the adapter to bend at the bending portion. In particular, for the case where the structure of the adapter is roughly plate-shaped before assembly and there is a bending position in its structure after assembly, the adapter can realize a soft connection between the pole body and the battery cell body, which facilitates the adapter to bend smoothly at the bending portion during the assembly process, thereby improving the assembly convenience.

[0035] In some embodiments, the adapter includes multiple adapter foils, which are stacked and partially connected to form a first connecting portion and a second connecting portion that are spaced apart. The first connecting portion is connected to the pole body, and the second connecting portion is connected to the pole ear.

[0036] In the above technical solution, by setting the adapter to include multiple stacked adapter foils, the number of adapter foils, as well as the structure and size of a single adapter foil can be flexibly set, so that the adapter has a flexible structure and size design, thereby improving the applicability and practicality of the adapter, which is beneficial to reducing the difficulty of connection with the pole body, reducing the difficulty of connection with the pole ear group, and improving the convenience of assembly. In addition, since partial areas of the stacked multiple adapter foils are connected to form the first connecting portion and the second connecting portion set at intervals, the surfaces of the two adjacent adapter foils facing each other are partially connected but not completely connected, which is beneficial to reducing the processing steps of the adapter; moreover, since the thickness of a single adapter foil is smaller than the thickness of the adapter, multiple adapter foils are equivalent to multi-layer thin plates, and the adapter formed by multiple adapter foils is easier to bend than the one-piece molded adapter sheet. At the same time, the stiffness of some areas of the adapter is relatively small, which facilitates the bending of the adapter in the above-mentioned area with smaller stiffness during the assembly of the battery cell. Therefore, the setting of the above-mentioned adapter facilitates the realization of a soft connection between the tab group and the pole body, so that the adapter is bent into a certain shape during the assembly of the battery cell, thereby meeting the design requirements.

[0037] In some embodiments, a portion of the adapter between the first connection portion and the second connection portion forms a third connection portion, and the third connection portion is bent to connect the first connection portion and the second connection portion.

[0038] In the above technical solution, in the portion of the adapter's multiple adapter foils corresponding to the third connection portion, two adjacent adapter foils can be unconnected. This allows the third connection portion to have a lower rigidity than the first and second connection portions, facilitating bending at the third connection portion. This improves assembly convenience when the adapter's structural form changes during assembly, such as when the third connection portion is unbent before assembly and bent after assembly. Furthermore, the bent adapter can provide a buffering support while reliably supporting the free ends of the tab assembly, thereby reducing the risk of the battery cell components impacting the housing components and improving the reliability of the battery cell.

[0039] In some embodiments, the plurality of transfer foils include at least one first transfer foil and at least one second transfer foil, and the first transfer foil and the second transfer foil are respectively connected to two sides of the thickness of the electrode tab portion.

[0040] In the above technical solution, by arranging the first adapter foil and the second adapter foil to be connected to both sides of the thickness of the free end respectively, the free end can be separated from the pressurizing device by the first adapter foil and the second adapter foil to protect the free end, reduce the risk of the tabs of the tab group being easily cracked due to thin thickness, etc., which is beneficial to improving the welding quality between the tab group and the adapter, and improving the connection reliability between the tab group and the adapter.

[0041] In some embodiments, all the tab groups of the battery cell group are gathered and bent to form open slots, and the adapter includes a first connecting portion and a second connecting portion, the first connecting portion is connected to the pole column component, and the second connecting portion extends into one of the open slots and is connected to the tab portion to support the tab portion.

[0042] In the above technical solution, the second connecting portion extends into one of the open grooves to support the tab group, which is beneficial to reduce the risk of short circuit caused by the tab group being inserted upside down into the battery body or inserted upside down into the root position of the battery body adjacent to the tab group, thereby improving the reliability of the battery cell.

[0043] In some embodiments, the orthographic projection of at least part of the pole ear portion on the first shell wall is located within the orthographic projection range of the second connecting portion on the first shell wall, and the thickness of the second connecting portion is greater than or equal to the thickness of the pole ear portion.

[0044] In the above technical solution, by setting the orthographic projection of the supported part of the pole ear on the first shell wall to be within the orthographic projection range of the second connection part, and the thickness of the second connection part is greater than or equal to the thickness of the pole ear, the cross-sectional area of ​​the second connection part can be greater than or equal to the cross-sectional area of ​​the pole ear, which is beneficial to reducing the resistance at the connection position between the second connection part and the pole ear, and improving the flow capacity at the connection position between the second connection part and the pole ear, thereby facilitating the reduction of the internal resistance of the battery cell and improving the flow capacity of the battery cell.

[0045] In some embodiments, all the same polarity tab groups of the battery cell group converge near the battery cell body to form a gathered portion, one end of the gathered portion is connected to the bent tab portion, and the other end is connected to the battery cell body, and the end surface of the portion where the second connection portion is connected to the tab portion extends to a position close to the bend of the gathered portion.

[0046] In the above technical solution, by setting one end of the gathering portion to be connected to the bent pole ear portion, the end face of the portion where the adapter is connected to the pole ear portion extends to a position close to the bending of the gathering portion, so that the adapter can support the entire pole ear portion and improve the support reliability of the free end; at the same time, since the multiple pole ear sheets of the pole ear group are only gathered together but not connected when forming the gathering portion, the adapter can have a certain indirect pressure effect on the bending position of the gathering portion, which is convenient for improving the tightness of the gathering portion, so that the gathering portion maintains a preset gathering shape and cannot be dispersed, which is beneficial to reducing the risk of the gathering portion being inserted upside down into the battery cell body.

[0047] In some embodiments, the battery cell further includes: an insulating component disposed in the accommodating cavity and having a through-hole formed therein, the insulating component blocking the portion of the tab group and / or adapter that passes through the through-hole to the side of the insulating component that faces away from the battery cell body and the battery cell body.

[0048] In the above technical solution, the insulating component can be used to isolate the battery cell body from the first shell wall of the shell component, reducing the probability of contact between the battery cell body and the first shell wall of the shell component, thereby reducing the risk of the battery cell body causing the first shell wall of the shell component to be corroded due to leakage, reducing the risk of the battery cell body itself failing, and reducing the risk of leakage, thereby improving the reliability and stability of the battery cell; and the insulating component is blocked between the portion of the conductive part that is perforated to the side of the insulating component away from the battery cell body and the battery cell body, so as to separate the portion of the conductive part that is perforated to the side of the insulating component away from the battery cell body from the battery cell body, reducing the probability of the conductive part being inserted upside down into the battery cell body due to redundancy, etc., thereby reducing the risk of short circuit in the battery cell and improving the reliability of the battery cell.

[0049] In some embodiments, the insulating component includes: an insulating film that fully covers the battery cell body, a perforation is formed on the insulating film at a position opposite to the first shell wall, and a portion of the insulating film surrounding the perforation is blocked between the portion of the tab group that passes through the perforation to the side of the insulating film facing the pole body and the battery cell body.

[0050] In the above technical solution, since the portion of the insulating film surrounding the perforation is blocked between the portion of the tab group that passes through the perforation to the insulating film on the side facing the pole body and the battery cell body, it is convenient to make the size of the perforation on the insulating film adaptable to the size of the tab group. For example, the size of the first avoidance hole is adapted to the thickness of the portion of the tab group located at the first avoidance hole. On the one hand, the perforation allows the tab group to be smoothly passed through to be electrically connected to the pole body. On the other hand, when the tab group is passed through the perforation, the insulating film can still cover the multiple tab sheets of the tab group adjacent to the root of the battery cell body, further achieving insulation protection for the battery cell body and reducing the risk of bare leakage of the battery cell body. At the same time, the portion of the tab group that passes through the perforation can be separated from the battery cell body, reducing the probability of the tab group and / or adapter being inserted upside down into the battery cell body due to redundancy, and the probability of the tab group adjacent to the root of the battery cell body, which is conducive to further reducing the risk of short circuit in the battery cell.

[0051] In some embodiments, the insulating component includes: an insulating bracket, which is arranged on the side of the battery cell body facing the first shell wall, and a through hole is formed in the insulating bracket at a position opposite to the pole component, and the part of the insulating bracket surrounding the through hole is blocked between the adapter and the battery cell body.

[0052] In the above technical solution, since the insulating bracket surrounds the perforated part and blocks the adapter and the battery cell body, the insulating bracket can play a certain supporting role on the adapter, and the adapter supports the free end of the tab group. The insulating bracket can then insulate and separate the free end of the tab group from the battery cell body, reducing the chance of the free end of the tab group being inserted upside down into the battery cell body, and the chance of the tab group being inserted upside down into the root of the adjacent battery cell body, thereby reducing the risk of short circuit and improving the reliability of the battery cell.

[0053] In some embodiments, the pole component forms a receiving groove that is recessed relative to the first shell wall in a direction away from the battery core component and open in a direction toward the battery core component, and the adapter is at least partially received in the receiving groove.

[0054] In the above technical solution, by providing a receiving groove to accommodate the adapter, the space occupied by the adapter in the receiving chamber can be reduced, leaving the receiving chamber with more room to accommodate the battery cell body, which is beneficial for increasing the volume of the battery cell body and thus the energy density of the battery cell. Moreover, because the receiving groove is open toward the battery cell component, the adapter can be easily inserted into the receiving groove, reducing the difficulty of operation.

[0055] In some embodiments, the pole component further includes a transition structure and an insulating structure. The transition structure surrounds the pole body and is connected to the first shell wall. The insulating structure is insulated and fitted between the transition structure and the pole body.

[0056] In the above technical solution, the structure of the pole component is simple and easy to process. Since it includes two parts, the pole body and the adapter structure, the shape and size of the pole body and the shape and size of the adapter structure can be designed separately based on different factors to flexibly adapt to the connection requirements with different forms of shell components and battery cell components, thereby increasing the scope of application of the pole component.

[0057] In some embodiments, the insulating structure includes a sealing structure, which is arranged around the circumference of the transition structure facing the pole body and is at least partially clamped between the transition structure and the pole body in the inner and outer directions of the first shell wall.

[0058] In the above technical solution, by setting at least a portion of the sealing structure to be clamped between the adapter structure and the pole body in the inner and outer directions of the first shell wall, an axial seal between the adapter structure and the pole body is achieved. The axial seal can achieve a more reliable sealing effect and improve the leakage problem at the matching position of the adapter structure and the pole body. The embodiment of the present application can reduce the axial force acting on the first shell wall by integrating the axial seal into the pole component. Moreover, by setting the sealing structure ring around the inner ring of the adapter structure, the sealing structure can be close to the matching position of the adapter structure and the pole body, which is conducive to sealing the matching position of the adapter structure and the pole body in a shorter path, improving the reliability of the seal, and is conducive to reducing the size of the sealing structure, reducing the sealing area, and easily achieving compression sealing. The seal is not easy to fail, thereby improving the sealing effect.

[0059] In some embodiments, the pole body includes a peripheral portion, the transition structure is clamped on both sides of the peripheral portion in the inner and outer directions of the first shell wall through the insulating structure, and the sealing structure is clamped between the side of the peripheral portion facing the battery core component and the transition structure.

[0060] In the above technical solution, the structure of the pole component is simple and easy to process, and the relative fixation and insulation matching between the pole body and the adapter structure can be simply and effectively achieved. The peripheral portion of the pole body and the adapter structure are used to clamp the sealing structure, so that the sealing structure can be in the matching position of the adapter structure and the pole body, which is conducive to sealing the matching position of the adapter structure and the pole body in a shorter path, improving the reliability of the seal, and is conducive to reducing the size of the sealing structure, reducing the sealing area, and easily achieving compression sealing on it. The seal is not easy to fail, thereby improving the sealing effect. Moreover, since at least part of the sealing structure is clamped between the side of the peripheral portion facing the battery core component and the adapter structure, the sealing structure can be sealed from the side of the peripheral portion facing the accommodating cavity, which can more effectively inhibit the leakage of electrolyte from the matching position of the pole body and the adapter structure, thereby improving the sealing effect.

[0061] In some embodiments, the transition structure includes a mating ring portion, the pole body includes a penetration portion passing through the mating ring portion, and an inner limiting portion and an outer limiting portion connected to the penetration portion and clamped on both sides of the mating ring portion, and at least a portion of the sealing structure is clamped between the mating ring portion and the transition structure.

[0062] In the above technical solution, the structure of the pole component is simple and easy to process, and the relative fixation and insulation matching of the pole body and the transition structure can be simply and effectively achieved. The sealing structure is clamped by the matching position of the pole body and the matching ring part, so that the sealing structure can be in the matching position of the transition structure and the pole body, which is conducive to sealing the matching position of the transition structure and the pole body in a shorter path, improving the reliability of the seal, and is conducive to reducing the size of the sealing structure, reducing the sealing area, and easily achieving compression sealing on it. The seal is not easy to fail, thereby improving the sealing effect. Moreover, since at least part of the sealing structure is clamped between the matching ring part and the inner limit part, the sealing structure can be sealed from the side of the matching ring part facing the accommodating cavity, which can more effectively inhibit the leakage of electrolyte from the matching position of the pole body and the transition structure, thereby improving the sealing effect.

[0063] In some embodiments, the shell component includes a shell body and a shell cover, the shell body is an integral piece and one end is open, the shell cover is arranged at the open end of the shell body, and the end of the shell body opposite to the shell cover is the first shell wall; or, the shell cover is the first shell wall.

[0064] In the above technical solution, the structural design of the shell component is flexible, and the arrangement position of the pole component is flexible.

[0065] In some embodiments, the battery cell further includes: a pressure relief component, which is provided on the housing component and is located on the same side or on the opposite side as the pole component.

[0066] In the second aspect, an embodiment of the present application provides a processing method, which is characterized in that the processing method is used to process the above-mentioned battery cell, and the processing method includes: extending all the tab groups of the battery cell group toward the middle position of the battery cell group in the first direction; loading the battery cell component into the accommodating cavity, and arranging one end of the tab group of the battery cell component on the inner side of the first shell wall and opposite to the first shell wall; installing the pole column component on the first shell wall, and connecting all the tab groups to the pole column body.

[0067] In the above technical solution, before the battery cell components are loaded into the accommodating cavity, all the tab groups of the battery cell group are first shaped so that all the tab groups extend toward the middle position of the battery cell group in the first direction. This can reduce the length of the tab group, improve the redundancy of the tab group, and reduce the risk of the tab group being inserted upside down into the battery cell body or into the root position of the tab group connected to the battery cell body. At the same time, it is beneficial to improve the problems of wrinkling, bending and breaking of the tab sheets of the tab group, thereby improving the reliability of the battery cell.

[0068] In some embodiments, a mounting hole is formed in the first shell wall, and a conductive part is connected to one end of the battery core component, and the conductive part includes a pole ear part, or includes a pole ear part and a adapter; the step of mounting the pole component on the first shell wall and connecting all the pole ear groups to the pole body includes: passing the end of the conductive part away from the battery core body through the mounting hole to the outside of the first shell wall and connecting to the pole body; the pole component connected to the conductive part is covered on the mounting hole from the inside or outside of the first shell wall; or, the pole component is mounted on the first shell wall, and the step of connecting all the pole ear groups to the pole body includes: placing the battery core component on the inside of the first shell wall, connecting the end of the conductive part away from the battery core body to the pole body; passing the pole component connected to the conductive part through the mounting hole and covering the mounting hole from the inside or outside of the first shell wall.

[0069] In the above technical solution, the end of the conductive part away from the battery cell body is passed through the mounting hole to the outside of the first shell wall and connected to the pole body. Since the conductive part is not yet connected to the pole component when passing through the mounting hole, it is convenient for the adapter to pass through the mounting hole, thereby improving the convenience of operation. Moreover, since the welding position of the pole component and the conductive part is located on the outside of the first shell wall, it can improve the problem of conductive chips formed during welding entering the interior of the shell body and damaging the battery cell component. The conductive part is first connected to the pole component, and then the pole component is installed on the first shell wall. Since the battery cell component and the pole component are connected first and then the pole component is passed through the mounting hole, there is no need to consider the problem of avoiding the first shell wall when connecting the battery cell component and the pole component. In other words, when connecting the battery cell component and the pole component, the pole component and the battery cell component are not located on both sides of the first shell wall, which is conducive to further shortening the length of the conductive part, reducing the redundancy of the conductive part after assembly, reducing the risk of reverse insertion, and improving the reliability of the battery cell. Furthermore, because the welding position between the pole component and the cell component is located outside the housing, the problem of conductive debris formed during welding entering the interior of the housing and damaging the cell component can be alleviated. Furthermore, because the pole component covers the mounting hole from the outside of the first housing wall, the adapter structure abuts against the outside of the first housing wall, and the adapter structure and the first housing wall are connected from the outside of the first housing wall, facilitating assembly and connection of the pole component and the first housing wall, thereby improving the reliability of the connection between the pole component and the first housing wall.

[0070] In some embodiments, the pole component connected to the conductive part is covered on the mounting hole from the inner side or outer side of the first shell wall, or the pole component connected to the conductive part is passed through the mounting hole and then covered on the mounting hole from the inner side or outer side of the first shell wall: when the pole component is installed on the first shell wall, the part of the conductive part located between the first shell wall and the battery cell body is bent.

[0071] In the above technical solution, the conductive part can play a buffering role. When the battery cell is used in a vibration environment, the impact of the battery cell body toward the first shell wall can be reduced, thereby protecting the battery cell components and improving the reliability of the battery cell. In addition, before the pole component is installed on the first shell wall, the part of the conductive part located between the first shell wall and the battery cell body can be basically in an expanded state, which is convenient for connecting the tab group and the adapter, and / or the adapter and the pole body, and is convenient for having sufficient operating space, for example, it is convenient to lay the part of the conductive part connected to the pole body on the pole body for connection.

[0072] In some embodiments, the battery cell includes an insulating bracket located on the inner side of the first shell wall; when the pole component is installed on the first shell wall, the step of making the portion of the conductive part located between the first shell wall and the battery cell body bent includes: when the pole component is installed on the first shell wall, the portion of the conductive part located between the first shell wall and the battery cell body is bent to form at least one open groove; and a portion of the insulating bracket is inserted into the at least one open groove.

[0073] In the above technical solution, the insulating bracket can prevent the free end from moving toward the battery cell body, which is beneficial to further reduce the risk of the tab group moving toward the battery cell body and causing a short circuit due to inverted insertion into the battery cell body, and is beneficial to improving the reliability of the battery cell.

[0074] In some embodiments, the conductive part includes at least one pole ear part and an adapter. When the pole column component is installed on the first shell wall, the step of making the portion of the conductive part located between the first shell wall and the battery cell body bent specifically includes: when the pole column component is installed on the first shell wall, the pole ear group and the adapter are connected, and the pole ear group is bent to form a first opening groove, and the adapter is bent to form a second opening groove adjacent to the first opening groove and located on the side of the first opening groove facing the pole column body, and the opening directions of the second opening groove and the first opening groove are arranged at an angle; a portion of the insulating bracket is inserted into at least one of the first opening groove and the second opening groove.

[0075] In the above technical solution, the insulating bracket can prevent the free end from moving toward the battery cell body, and the insulating bracket can also prevent the adapter from moving toward the battery cell body, which is beneficial to further reduce the risk of reverse insertion and improve reliability.

[0076] In some embodiments, the step of connecting the end of the conductive part away from the battery cell body to the pole body includes: adjusting the angle of the pole component so that the normal of the inner end surface of the pole body is close to the stacking direction of multiple battery cell bodies, and the step of covering the pole component connected to the conductive part on the mounting hole includes: adjusting the angle of the pole component on the outer side of the first shell wall so that the normal of the inner end surface of the pole body is close to perpendicular to the stacking direction of multiple battery cell bodies, and the conductive part is bent to form at least one open groove.

[0077] In the above technical solution, by first adjusting the position and angle of the pole component so that the normal direction of the inner end face of the pole body is close to the stacking direction of multiple battery cell assemblies, and then laying the part of the adapter connected to the pole body on the inner end face of the pole body, there is no need to adjust the angle of the pole body. There can be enough space near the matching position of the part of the adapter connected to the pole body and the inner end face of the pole body for welding the adapter and the pole body, thereby simplifying the operation and making the length of the pole ear shorter. Then, when adjusting the angle of the pole component to connect with the first shell wall, the conductive part can be bent to form at least one open groove.

[0078] In some embodiments, a conductive part is connected to one end of the battery cell body, and the conductive part includes a tab group and an adapter. When the pole column component is installed on the first shell wall, the tab group and the adapter are connected so that the tab group is bent to form a first open groove, and the adapter extends into the first open groove.

[0079] In the above technical solution, by making the adapter support the free end of the tab group during the assembly process, the free end can be prevented from moving toward the battery cell body, thereby reducing the risk of the tab group moving toward the battery cell body and causing a short circuit when being inserted into the battery cell body, which is beneficial to improving the reliability of the battery cell.

[0080] In some embodiments, when the pole component is installed on the first shell wall, the adapter is bent to form a second opening groove adjacent to the first opening groove and located on the side of the first opening groove facing the pole body. The openings of the second opening groove and the first opening groove are arranged at an angle, and at least a portion of the groove wall of the second opening groove facing the battery cell body extends into the first opening groove.

[0081] In the above technical solution, the adapter and the tab group can define a serpentine shape to play a role of buffer support, which is beneficial to reduce the risk of the battery cell components colliding with the shell components and improve the reliability of the battery cell.

[0082] In some embodiments, one end of the battery cell body is connected to a conductive part, the conductive part includes a tab group and a adapter, and the tab group includes multiple tab sheets; the step of extending all the tab groups of the battery cell group toward the middle position of the battery cell group in the first direction includes: converging the multiple tab sheets toward the middle position to form a stacked portion at the free end; and connecting the stacked portion to the adapter.

[0083] In the above technical solution, the laminated portion can be arranged in a corresponding central position to reduce the offset of the laminated portion relative to the center of the cell group in the first direction during subsequent assembly. The laminated portion is first pre-connected to form a first gathered portion with a certain degree of rigidity, rather than a loose, multi-layered foil. This facilitates the connection of the first gathered portion with the adapter, and makes the welding of the pole ear portion and the adapter more reliable. Porosity is less likely to form in the weld, which can improve the connection reliability and conductivity of the weld, making the conductivity of the cell component and the pole component more stable and reliable. The laminated portion does not need to be pre-connected, and the laminated portion is directly connected to the adapter, which helps to simplify the processing process and improve processing efficiency. When the laminated portion is connected to the adapter, the laminated portion forms the first gathered portion, which can also achieve a reliable connection between the laminated portion and the adapter.

[0084] In some embodiments, the step of connecting the lamination portion to the adapter includes: connecting multiple tabs of the tab group at the lamination portion position to form a tab portion, and connecting at least part of the tab portion to the adapter; or, directly connecting at least part of the lamination portion to the adapter.

[0085] In the above technical solution, the laminated parts are pre-connected to form a first, relatively rigid, gathered portion, rather than a loose, multi-layered foil. This facilitates the connection of the first gathered portion to the adapter, and makes welding between the tab and adapter more reliable. Porosity is less likely to form within the weld, improving the connection reliability and conductivity of the weld, and ensuring more stable and reliable electrical conduction between the cell and the pole. The laminated parts do not need to be pre-connected, and can be directly connected to the adapter, simplifying the processing process and improving processing efficiency. Simultaneously, the laminated parts form the first gathered portion, similarly achieving a reliable connection between the laminated parts and the adapter.

[0086] In some embodiments, the end of the adapter away from the pole body has a clamping structure and includes two oppositely arranged clamping parts; the step of connecting the laminated part to the adapter includes: clamping the laminated part with the two clamping parts from both sides of the free end; and connecting both clamping parts to the free end.

[0087] In the above technical solution, the two clamping parts can protect the free end, so as to improve the problem that the free end is easy to crack during the connection process with the clamping structure, and improve the connection reliability between the adapter and the tab group.

[0088] In some embodiments, the adapter includes a plurality of adapter foils; before connecting the laminate portion to the adapter, it also includes: stacking the plurality of adapter foils; connecting the stacked partial areas to form a first connection portion; the step of connecting the laminate portion to the adapter includes: connecting the stacked partial areas of the plurality of adapter foils to the free end so that the stacked partial areas form a second connection portion spaced apart from the first connection portion; connecting the first connection portion to the pole body.

[0089] In the above technical solution, partial areas of the stack are connected to form the first connection portion, thereby enabling the connection of multiple adapter foils. This improves the compactness of the adapter foils at the first connection portion and facilitates the connection of the adapter to the pole component. "Connecting the multiple adapter foils to the free ends" and "connecting the stacked partial areas of the multiple adapter foils to form the second connection portion" can be performed simultaneously, simplifying the manufacturing process.

[0090] In some embodiments, the shell component includes a shell body and a shell cover, and the shell body has an opening; when the end wall of the shell body opposite to the opening is the first shell wall, the steps of loading the battery core component into the accommodating cavity and arranging the battery core component on the inner side of the first shell wall and opposite to the first shell wall include: loading the battery core component into the accommodating cavity from the opening; extending the pole tab group from the mounting hole so that one end of the battery core component where the pole tab group is set is arranged on the inner side of the first shell wall and opposite to the first shell wall; closing the shell cover on the opening; when the shell cover is the first shell wall, the steps of loading the battery core component into the accommodating cavity and arranging one end of the battery core component where the pole tab group is set is arranged on the inner side of the first shell wall and opposite to the first shell wall include: supporting the battery core component on the inner side of the shell cover; extending the pole tab group from the mounting hole so that one end of the battery core component where the pole tab group is set is arranged on the inner side of the first shell wall and opposite to the first shell wall; sleeve the shell body on the outer side of the battery core component and connect it to the shell cover.

[0091] In the above technical solution, by arranging the terminal component at the end of the shell body opposite the opening, cracking at the connection between the shell body and the shell cover is alleviated, thereby improving the reliability of the battery cell. By first completing the connection between the shell body and the shell cover, and then connecting the terminal component to the shell cover, the shell body can be used to accommodate the battery cell components and support the shell cover. This facilitates the positioning and support of the shell cover, facilitating the connection between the shell cover and the adapter structure, and improving the reliability of the connection between the shell cover and the terminal component.

[0092] In some embodiments, when the end wall of the shell body opposite to the opening is the first shell wall, before the battery core component is loaded into the accommodating cavity from the opening, the insulating film is also wrapped around the outside of the battery core body; when the shell cover is the first shell wall, before the shell body is put on the outside of the battery core component, the insulating film is also wrapped around the outside of the battery core body.

[0093] In the above technical solution, the battery core component and the insulating film are put into the shell together, which is convenient for the arrangement of the insulating film and the insulation arrangement between the battery core component and the shell component.

[0094] In a third aspect, an embodiment of the present application provides a battery, characterized in that it includes the above-mentioned battery cell.

[0095] In the above technical solution, the performance of the battery can be improved due to the use of the above battery cells.

[0096] In some embodiments, the battery includes a box body, multiple battery cells are accommodated in the box body, the bottom of the box body is the box body bottom plate, and the pole component is arranged on the side of the shell component facing the box body bottom plate, or on the side of the shell component away from the box body bottom plate.

[0097] In the above technical solution, when the pole component of the battery cell is arranged on the side of the shell component facing the bottom plate of the box body, the battery cell is in an inverted state, and the decompression product is sprayed in the direction away from the passenger compartment, which is safer; when the pole component of the battery cell is arranged on the side of the shell component facing away from the bottom plate of the box body, the battery cell is in an upright state, and the electrolyte is not easy to leak; therefore, the orientation of the battery cell and the box body can be flexibly set.

[0098] In a fourth aspect, an embodiment of the present application provides an electrical device comprising the above-mentioned battery.

[0099] In the above technical solution, since the performance of the battery is improved, it is beneficial to improve the working power performance of the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0100] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0101] Figure 1 A schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0102] Figure 2 An exploded view of a battery provided in accordance with some embodiments of the present application;

[0103] Figure 3 A schematic structural diagram of a battery cell provided in some embodiments of the present application;

[0104] Figure 4 for Figure 3 An exploded view of a battery cell is shown in FIG;

[0105] Figure 5 An exploded view of a battery cell provided in some embodiments of the present application;

[0106] Figure 6A cross-sectional view of a battery cell provided in some embodiments of the present application, wherein the conductive portion includes a tab assembly and an adapter;

[0107] Figure 7 for Figure 6 A partial schematic diagram of a battery cell is shown;

[0108] Figure 8 A partial cross-sectional view of a battery cell provided in some embodiments of the present application, wherein the conductive portion does not include an adapter;

[0109] Figure 9 A cross-sectional view of a battery cell provided in some embodiments of the present application;

[0110] Figure 10 A cross-sectional view of a battery cell provided in some embodiments of the present application;

[0111] Figure 11 A cross-sectional view of a battery cell provided in some embodiments of the present application, in which the terminal component is in a state before being covered by the first shell wall;

[0112] Figure 12 A cross-sectional view of a battery cell provided in some embodiments of the present application, in which the terminal component is in a state before being covered by the first shell wall;

[0113] Figure 13 A cross-sectional view of a battery cell provided in some embodiments of the present application, in which the terminal component is in a state before being covered by the first shell wall;

[0114] Figure 14 A schematic diagram of an adapter provided in some embodiments of the present application;

[0115] Figure 15 A schematic diagram of an adapter provided in some embodiments of the present application;

[0116] Figure 16 A schematic diagram of the insulation film coating provided in some embodiments of the present application;

[0117] Figure 17 A schematic diagram of the insulation film coating provided in some embodiments of the present application;

[0118] Figure 18 A schematic diagram of an insulating bracket provided in some embodiments of the present application;

[0119] Figure 19 for Figure 18 Schematic diagram of the assembly of the insulating bracket shown in;

[0120] Figure 20 A schematic diagram of an insulating bracket provided in some embodiments of the present application;

[0121] Figure 21for Figure 20 Schematic diagram of the assembly of the insulating bracket shown in;

[0122] Figure 22 A schematic diagram of a pole component provided in some embodiments of the present application;

[0123] Figure 23 for Figure 22 Another schematic diagram of the pole component shown in;

[0124] Figure 24 for Figure 23 The view from direction B shown in FIG;

[0125] Figure 25 for Figure 22 Cross-sectional view of CC;

[0126] Figure 26 A partial cross-sectional view of a battery cell provided in some embodiments of the present application;

[0127] Figure 27 A partial cross-sectional view of a battery cell provided in some embodiments of the present application;

[0128] Figure 28 A partial cross-sectional view of a battery cell provided in some embodiments of the present application;

[0129] Figure 29 A partial cross-sectional view of a battery cell provided in some embodiments of the present application;

[0130] Figure 30 A partial cross-sectional view of a battery cell provided in some embodiments of the present application;

[0131] Figure 31 A partial cross-sectional view of a battery cell provided in some embodiments of the present application;

[0132] Figure 32 A partial cross-sectional view of a battery cell provided in some embodiments of the present application, in which the terminal component is in a state before being covered by the first shell wall;

[0133] Figure 33 A partial cross-sectional view of a battery cell provided in some embodiments of the present application;

[0134] Figure 34 A partial cross-sectional view of a battery cell provided in some embodiments of the present application;

[0135] Figure 35 A partial cross-sectional view of a battery cell provided in some embodiments of the present application;

[0136] Figure 36 This is a flow chart of a method for processing a battery cell according to some embodiments of the present application;

[0137] Figure 37 This is a flow chart of a method for processing a battery cell according to some embodiments of the present application;

[0138] Figures 38A-38E This is a schematic diagram of the processing decomposition of some embodiments of the present application;

[0139] Figure 39 This is a flow chart of a method for processing a battery cell according to some embodiments of the present application;

[0140] Figures 40A-40D This is a schematic diagram of the processing decomposition of some embodiments of the present application;

[0141] Figure 41 This is a flow chart of a method for processing a battery cell according to some embodiments of the present application;

[0142] Figure 42 This is a flow chart of a method for processing a battery cell according to some embodiments of the present application;

[0143] Figure 43 This is a flow chart of a method for processing a battery cell according to some embodiments of the present application;

[0144] Figure 44 This is a flow chart of a method for processing a battery cell according to some embodiments of the present application;

[0145] Figure 45 This is a flow chart of a method for processing a battery cell according to some embodiments of the present application;

[0146] Figure 46 This is a flow chart of a method for processing a battery cell according to some embodiments of the present application;

[0147] Figure 47 This is a flow chart of a method for processing a battery cell according to some embodiments of the present application;

[0148] Figure 48 This is a flow chart of a method for processing a battery cell according to some embodiments of the present application;

[0149] Figure 49 This is a flow chart of a method for processing a battery cell according to some embodiments of the present application;

[0150] Figure 50 This is a flow chart of a method for processing a battery cell according to some embodiments of the present application;

[0151] Figure 51 This is a flow chart of a method for processing a battery cell according to some embodiments of the present application;

[0152] Figure 52 This is a flow chart of a method for processing a battery cell according to some embodiments of the present application;

[0153] Figure 53 This is a flow chart of a method for processing a battery cell according to some embodiments of the present application;

[0154] Figure 54 This is a flow chart of a method for processing a battery cell according to some embodiments of the present application;

[0155] Figures 55A-55F This is a schematic diagram of the processing decomposition of some embodiments of the present application.

[0156] Reference numerals:

[0157] Electrical device 1000;

[0158] Battery 100; Controller 200; Motor 300;

[0159] Box body 101; first box portion 1011; second box portion 1012;

[0160] Battery cell 102; first direction F1; second direction F2; third direction F3; fifth direction F5; sixth direction F6;

[0161] Shell component 1; shell body 11; first shell wall 111; first sink 1111; overlap portion 1112; mounting hole 112; opening 113; second shell wall 114; shell cover 12; accommodating cavity 13; sealing ring 14;

[0162] Pole component 2; pole body 21; inner end surface 211; outer end surface 213; penetration portion 214; rivet portion 2141; inner limiting portion 215; outer limiting portion 216; first pole member 21a; second pole member 21b; matching hole 21b1; adapter structure 22; inner end surface 220 of the adapter structure; surrounding area 2201; flange portion 22a; second recess 22b; first adapter ring 221; second adapter ring 222; stop ring portion 2221; first insulating frame 224; third adapter ring 223; inner extension portion 2231; outer extension portion 2232; second insulating frame 225; fourth adapter ring 227; matching ring portion 2271; third insulating frame 228; insulating structure 23; sealing structure member 231; shaft side portion 231a; first insulating member 232; second insulating member 234; insulating sealing member 24;

[0163] Battery core component 3; battery core assembly 31; tab sheet 311; laminated portion 312; battery core body 32; battery core group 32A; tab group 33; free end 331; tab portion 332; retracted portion 333; first opening slot 334; axial cross section of battery core component 34; opening slot P;

[0164] Adapter 35; adapter foil 350; first adapter foil 3501; second adapter foil 3502; first connecting portion 351; second connecting portion 352; bent portion 353; second groove 3531; third connecting portion 354; second opening slot 355; clamping structure 356; clamping portion 3561; main structure 357; branch structure 358; branch segment 3581; conductive portion 36; first conductive segment 415; second conductive segment 416; third conductive segment 417;

[0165] Insulating component 4; perforation 40; insulating film 41; tearing structure 411; insulating bracket 42; bracket body 421; first separator 422;

[0166] Accommodating groove 5; pressure relief component 6; binding part 8. DETAILED DESCRIPTION

[0167] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0168] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0169] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0170] In the description of this application, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood broadly. For example, they can refer to direct connection or indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0171] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0172] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0173] The term "plurality" used in this application refers to two or more (including two).

[0174] In this application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, magnesium-ion batteries, or solid-state batteries, etc., and the embodiments of this application do not limit this. Battery cells may be cylindrical, flat, rectangular, or other shapes, etc., and the embodiments of this application do not limit this. Battery cells are generally divided into three types based on the packaging method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, and the embodiments of this application do not limit this.

[0175] The battery referred to in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may be a battery module or battery pack. A battery module generally includes multiple battery cells. A battery generally includes a casing for encapsulating one or more battery cells, or one or more battery modules. The casing can prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells. Of course, the battery may also not include a casing.

[0176] For example, a battery cell may generally include a shell component, a cell component, and an electrolyte (which may be a solid electrolyte layer located between the positive and negative electrode sheets in a solid-state battery). The shell is used to accommodate the cell components and the electrolyte, and is provided with at least one positive electrode post and at least one negative electrode post. The cell component includes one or more cell assemblies, which are formed by stacking or winding positive electrode sheets, negative electrode sheets, and a separator (this structure may be omitted in a solid-state battery). The material of the shell component is not limited, and includes, but is not limited to, aluminum shells, steel shells, aluminum-plastic films, plastics, or other materials resistant to electrolyte corrosion.

[0177] The positive electrode sheet generally includes a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer is directly or indirectly coated on the positive electrode current collector. The positive electrode current collector not coated with the positive electrode active material layer protrudes from the positive electrode current collector coated with the positive electrode active material layer. The positive electrode current collector not coated with the positive electrode active material layer serves as a positive electrode tab. Multiple positive electrode tabs are stacked together and electrically connected to the positive electrode post. For example, the stacked multiple positive electrode tabs can be directly welded to the positive electrode post to form an electrical connection; alternatively, the battery cell assembly may further include a positive electrode adapter. The stacked multiple positive electrode tabs are welded to one end of the positive electrode adapter, and the other end of the positive electrode adapter is welded to the positive electrode post to form an electrical connection between the positive electrode tab and the positive electrode post.

[0178] The negative electrode sheet can generally include a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is directly or indirectly coated on the negative electrode current collector. The negative electrode current collector not coated with the negative electrode active material layer protrudes from the negative electrode current collector coated with the negative electrode active material layer. The negative electrode current collector not coated with the negative electrode active material layer serves as a negative electrode tab. Multiple negative electrode tabs are stacked together and electrically connected to the negative electrode column. For example, the multiple stacked negative electrode tabs can be directly welded to the negative electrode column to form an electrical connection; alternatively, the battery cell assembly can further include a negative electrode adapter. The multiple stacked negative electrode tabs are welded to one end of the negative electrode adapter, and the other end of the negative electrode adapter is welded to the negative electrode column to form an electrical connection between the negative electrode tab and the negative electrode column. The material of the separator is not limited, and can be, for example, polypropylene or polyethylene.

[0179] The pressure relief components on the battery cells mentioned in this application are used to release gas from the battery cells when the internal pressure of the battery cells is excessive (for example, due to overcharging), thereby reducing the internal pressure of the battery cells and preventing excessive internal pressure in the battery cells from causing explosions. For example, the pressure relief components may be explosion-proof valves, explosion-proof discs, etc.

[0180] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role.

[0181] In the related art, a power battery includes a battery cell. The tabs of the battery cell need to be electrically connected to the poles. The arrangement of the tabs usually affects the reliability of the battery cell and needs further improvement.

[0182] Based on the above considerations, a battery cell is proposed, which includes a shell component, a pole component and a cell component. The shell component has a accommodating cavity and includes a first shell wall that participates in defining the accommodating cavity. The pole component is installed on the first shell wall and includes a pole body. The cell component includes at least one group of cell groups. The cell group includes n cell bodies. The n cell bodies are all arranged in the accommodating cavity and are arranged in sequence along a first direction. The end of each cell body is connected to a pole lug group. All pole lug groups of the cell group extend toward a middle position close to the cell group in the first direction and are connected to form a pole lug portion. The pole lug portion is electrically connected to the pole body. n ≥ 1 and is a positive integer.

[0183] In the above technical solution, all the tab groups of the battery cell group extend toward the middle position of the battery cell group in the first direction and are connected to form a tab portion. On the one hand, there is only one tab portion. Compared with multiple folding in batches, the one-time folding process is simple and the cost is lower. Moreover, compared with multiple folding in batches, the folding process does not need to consider the number of battery cell bodies. Regardless of the number of battery cell bodies, they can all be folded directly at one time. On the other hand, folding in the center to form a tab portion can shorten the average length of multiple tab sheets in the tab group compared to offset folding, thereby improving the redundancy of the tab group and reducing the risk of the tab group being invertedly inserted into the battery cell body or invertedly inserted into the root position of the tab group connected to the battery cell body. At the same time, it is beneficial to improve problems such as wrinkling, bending and breaking of the tab sheets of the tab group, thereby improving the reliability of the battery cell.

[0184] The technical solutions described in the embodiments of the present application are applicable to battery cells, batteries containing battery cells, and electrical devices using batteries.

[0185] Electrical devices may include, but are not limited to, vehicles, mobile phones, tablets, laptops, electric toys, electric tools, battery-powered vehicles, electric cars, ships, spacecraft, and the like. Electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys; spacecraft may include airplanes, rockets, space shuttles, and spacecraft; and electric tools may include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers.

[0186] For the convenience of description, the following embodiments are described by taking the electric device 1000 as a vehicle as an example.

[0187] Please refer to Figure 1 , Figure 1The power-consuming device 1000 provided for some embodiments of the present application is a structural schematic diagram of a vehicle. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. The vehicle is provided with a battery 100, and the battery 100 can be arranged at the bottom, head or tail of the vehicle. The battery 100 can be used to power the vehicle, for example, the battery 100 can be used as an operating power source for the vehicle. The vehicle may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for the starting, navigation and working power requirements of the vehicle during driving. In some embodiments of the present application, the battery 100 can not only serve as the operating power source of the vehicle, but also as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0188] Please refer to Figure 2 , Figure 2 An exploded view of the structure of the battery 100 provided for some embodiments of the present application. The battery 100 includes a housing 101 and a plurality of battery cells 102, and the battery cells 102 are accommodated in the housing 101. The housing 101 is used to provide an assembly space for the battery cells 102, and the housing 101 can adopt a variety of structures. In some embodiments, the housing 101 may include a first box portion 1011 and a second box portion 1012, and the first box portion 1011 and the second box portion 1012 cover each other, and the first box portion 1011 and the second box portion 1012 jointly define a accommodating cavity for accommodating the battery cells 102. A seal may also be provided at the connection position between the first box portion 1011 and the second box portion 1012 to achieve a sealed connection between the first box portion 1011 and the second box portion 1012.

[0189] For example, reference Figure 2 The first box portion 1011 and the second box portion 1012 can also both be hollow structures with one side open, with the open side of the first box portion 1011 covering the open side of the second box portion 1012 to form a box body 101 with a storage space. For another example, the second box portion 1012 can be a hollow structure with one end open, the first box portion 1011 can be a plate-shaped structure, and the first box portion 1011 covers the open side of the second box portion 1012, so that the first box portion 1011 and the second box portion 1012 jointly define a storage cavity. Of course, the box body 101 formed by the first box portion 1011 and the second box portion 1012 can be of various shapes, such as a cylinder or a rectangular parallelepiped.

[0190] In the battery 100, there can be one or more battery cells 102. When there are multiple battery cells 102, the multiple battery cells 102 can be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 102. The multiple battery cells 102 can be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell 102 can be housed in the housing 101. Alternatively, the battery 100 can be formed by first connecting multiple battery cells 102 in series, in parallel, or in a hybrid connection to form a battery module. The multiple battery modules are then connected in series, in parallel, or in a hybrid connection to form an entire battery cell, and then housed in the housing 101. The battery 100 can also include other structures. For example, the battery 100 can also include a busbar component for achieving electrical connection between the multiple battery cells 102.

[0191] Please refer to Figure 3-Figure 5 The battery cell 102 is a rectangular parallelepiped, with the thickness of the battery cell 102 being in the first direction F1, the height of the battery cell 102 being in the second direction F2, and the width of the battery cell 102 being in the third direction F3. The first direction F1, the second direction F2, and the third direction F3 are mutually perpendicular. However, this is not limiting. In other embodiments of the present application, the battery cell 102 may also be a polygonal prism, a flat body, or other shapes. The fourth direction F4 described below may be parallel to the first direction, and the fifth direction F5 may be parallel to the second direction.

[0192] Exemplarily, the battery cell 102 is a blade battery, and the battery core component 3 is constructed into a laminated structure. In this case, the multiple pole pieces of the battery core component 3 can be arranged in sequence along the first direction.

[0193] Please refer to Figure 6-Figure 8 , Figure 6 A cross-sectional view of a battery cell 102 provided in some embodiments of the present application is provided. Figure 7 For the Figure 6 A partial schematic diagram of the battery cell 102 shown in FIG. Figure 8 A partial cross-sectional view of a battery cell 102 provided in some embodiments of the present application. In the embodiments of the present application, the battery cell 102 includes a housing component 1 , a terminal component 2 , and a cell component 3 .

[0194] The pole component 2 is installed on the shell component 1. The shell component 1 has an accommodating cavity 13, and the shell component 1 includes a first shell wall 111. The first shell wall 111 helps to define the accommodating cavity 13, and the pole component 2 is installed on the first shell wall 111; illustratively, the first shell wall 111 has a mounting hole 112, and the pole component 2 is provided at the mounting hole. Among them, "the pole component 2 is installed on the first shell wall 111" means that there is an assembly connection relationship between the pole component 2 and the first shell wall 111, such as welding or riveting. Therefore, the shell component 1 and the pole component 2 are separate components, and the two are assembled and connected, so that the shell component 1 and the pole component 2 can be processed separately, which facilitates the processing of the two and is also conducive to the processing and manufacturing of the battery cell 102.

[0195] The cell component 3 includes a cell body 32, which is disposed in the accommodating cavity 13. A tab group 33 is connected to the end of the cell body 32, and the tab group 33 is electrically connected to the pole body 21. Exemplarily, the cell component 3 includes one or more cell assemblies 31, each of which includes a cell body 32 and a tab group 33. The portion of the current collector in the cell assembly 31 coated with the active material layer constitutes the cell body 32, while the portion not coated with the active material layer constitutes the tab group 33. The tab group 33 corresponds one-to-one to the cell body 32, and the tab group 33 may include multiple layers of tab sheets 311.

[0196] The cell assembly 3 includes at least one cell group 32A, each cell group 32A including n cell bodies 32. The n cell bodies 32 are disposed within the accommodating cavity 13, and the n cell bodies 32 of the cell group 32A are sequentially arranged along a first direction. The n cell bodies 32 are stacked in the first direction. Each cell body 32 is connected to a tab group 33 at its end. All tab groups 33 of the cell group 32A extend toward the center of the cell group 32A in the first direction and connect to form a tab portion 332. The tab portion 332 is electrically connected to the pole body 21. n ≥ 1, and n is a positive integer. Therefore, when the cell assembly 3 includes at least one cell body 32, and particularly when the cell assembly 3 includes multiple cell bodies 32, the voltage and capacity of the battery cell 102 are improved.

[0197] It can be understood that the multiple tab sheets 311 of all tab groups 33 of the battery cell group 32A are not only brought together but also connected into an integrated structure when forming the tab portion 332; for example, the multiple tab sheets 311 of all tab groups 33 of the battery cell group 32A can be connected into an integrated plate structure by welding (such as ultrasonic welding) to form the tab portion 332, and the multiple tab sheets 311 of all tab groups 33 of the battery cell group 32A can also be brought together and connected to form the tab portion 332 by conductive adhesive bonding or other methods, which will not be elaborated here.

[0198] For the battery cell 102, its cell groups 32A may consist of one or more groups. For a single cell group 32A, the middle position of the cell group 32A in the first direction may correspond to the gathered region R. In the first direction, the center of the gathered region R may be the center of the cell group 32A. All tab groups 33 of the cell group 32A extend into the gathered region R, and all of the tab groups 33 are connected at their free ends 331 to form a tab portion 332. In the first direction, at least a portion of the tab portion 332 is located within the gathered region R. In addition, when the cell assembly 3 includes multiple cell groups 32A, the number of cell bodies 32 in the multiple cell groups 32A may be equal or different. Regardless of whether the cell groups 32A consist of one or more groups, the number of cell bodies 32 in each cell group 32A may be an odd or even number.

[0199] The pole ear portion 332 may be directly electrically connected to the pole body 21 , or the pole ear portion 332 may be indirectly electrically connected to the pole body 21 via another adapter (eg, the adapter 35 described below).

[0200] Combine Figure 11 The end of the battery cell body 32 is connected to a conductive part 36 , which is electrically connected to the pole body 21 . The conductive part 36 includes a tab group 33 and an adapter 35 , and the tab group 33 is electrically connected to the pole body 21 through the adapter 35 .

[0201] For example, combined with Figure 9 When the cell body 32 of the cell component 3 is one, that is, n=1, the length L of the conductive portion 36 is calculated as follows:

[0202] ;

[0203] When the battery cell component 3 has multiple battery cell bodies 32 , that is, n≥2, and the battery cell groups 32A are one or more groups, for a single battery cell group 32A, the length L′ of the corresponding conductive portion 36 is calculated as follows:

[0204] ;

[0205] Among them, n is the number of cell bodies 32 (which can be understood as bare cells) in the cell group 32A, a is the offset between the folded connection position of the multiple tabs 311 of the cell group 32A and the center position of the cell group 32A in the first direction, h1 is the distance between the end face of the cell body 32 facing the first shell wall 111 and the first shell wall 111 (usually the thickness of the insulating bracket 42 between the cell body 32 and the first shell wall 111), δ is the thickness of a single cell body 32 in the first direction, h2 is the thickness of the shell component 1, the pole body 21 has a welding surface (for example, the inner end face 211 described later is configured as a welding surface), and λ is the size of the welding surface in the first direction.

[0206] To this end, regardless of whether the battery cell group 32A includes one battery cell body 32 or multiple battery cell bodies 32, for a single battery cell group 32A, the embodiment of the present application extends all the pole ear groups 33 of the battery cell group 32A toward the middle position of the battery cell group 32A in the first direction and connects them to form a pole ear portion 332. Then, in the extension direction of the conductive portion 36, the position O of one end of the pole ear portion 332 adjacent to the battery cell body 32 can be understood as a retracted connection position. Since the pole ear portion 332 is formed by extending and connecting all the pole ear groups 33 toward the above-mentioned middle position, it is convenient to reduce the offset of the retracted connection position and the center of the battery cell group 32A in the first direction in the first direction, that is, to reduce the offset a in the above formula, which is beneficial to The offset a tends to be 0 or very small; since the larger the offset a, the longer the required length of the conductive portion 36, and the longer the length of the tab group 33 and / or the adapter 35, the above-mentioned arrangement of the embodiment of the present application can reduce the length of the conductive portion 36 for both the schemes in which the tab group 33 is directly electrically connected to the pole body 21 and the scheme in which the tab group 33 is indirectly electrically connected to the pole body 21 through the adapter 35. For the case in which the tab group 33 is directly electrically connected to the pole body 21, the length of the tab group 33 can be directly reduced, and for the case in which the tab group 33 is indirectly electrically connected to the pole body 21 through the adapter 35, the length of the tab group 33 can also be reduced. At the same time, due to the setting of the adapter 35, the length of the tab group 33 can be further reduced.

[0207] In the above technical solution, all the tab groups 33 of the battery cell group 32A are extended toward the middle position of the battery cell group 32A in the first direction and connected to form a tab portion 332. On the one hand, there is only one tab portion 332. Compared with multiple folding in batches, the one-time folding process is simple and the cost is lower. Moreover, compared with multiple folding in batches, the folding process does not need to consider the number of battery cell bodies 32. Regardless of the number of battery cell bodies 32, they can be folded directly at one time. On the other hand, the central folding to form a tab portion 332 can shorten the average length of the multiple tab sheets 311 in the tab group 33 compared with the offset folding, thereby improving the redundancy of the tab group 33 and reducing the risk of the tab group 33 being inserted upside down into the battery cell body 32 or inserted upside down into the root position of the tab group 33 connected to the battery cell body 32. At the same time, it is beneficial to improve the problems of wrinkling, bending and breaking of the tab sheets 311 of the tab group 33, thereby improving the reliability of the battery cell 102.

[0208] Please refer to Figure 9In some embodiments, in the first direction, the midpoint of the battery cell group 32A in the first direction is the midpoint of the middle position. If the size of the middle position is less than or equal to 1 / 2 the size of a battery cell body 32, then the size of the retracted region R in the second direction is less than or equal to 1 / 2 the size of a battery cell body 32 in the second direction. Therefore, the middle position is not an absolute midpoint, but rather a small area surrounding the midpoint. This arrangement allows for a shorter length of the tab group 33 while accommodating different assembly and usage requirements, thereby reducing assembly requirements and improving the applicability and practicality of the battery cell 102.

[0209] For example, the size of the retracted area R in the second direction is 1 / 5, 1 / 4, 1 / 3 or 1 / 2 of the size of a cell body 32 in the second direction. Of course, the retracted area R can also be appropriately expanded to 2 / 3 of the size of a cell body 32.

[0210] Please refer to Figure 7-13 In some embodiments, the battery cell 102 includes m groups of battery cell groups 32A, where m≥1 and m is a positive integer, and each group of battery cell groups 32A corresponds to a pole ear portion 332. Figure 8 If the tab portion 332 is directly electrically connected to the pole body 21, the multiple tab groups 33 of the multiple battery cell groups 32A are connected as one body to be connected to the pole body 21, and the end of the above-mentioned integrated component adjacent to the battery cell body 32 in the extension direction of the tab portion 332 is position O; combined Figure 7 、 Figures 9-13 If the pole ear portion 332 is indirectly electrically connected to the pole body 21 through the adapter 35, the pole ear portions 332 of all battery cell groups 32A can be connected to the adapter 35 respectively, and the end of each pole ear portion 332 adjacent to the battery cell body 32 in its extension direction is position O, and each position O is located in the retracted area R of the corresponding battery cell group 32A.

[0211] For example, m=1 and n=1, the battery cell 102 includes a battery cell body 32; for another example, Figure 7-13 , at least one of m and n is greater than or equal to 2, then m=1 and n≥2, or m≥2 and n=1, or m≥2 and n≥2, at this time, the battery cell 102 includes a plurality of battery cell bodies 32 .

[0212] In the above technical solution, by setting the number of cell groups 32A and the number of cell bodies 32 in the cell group 32A, it is convenient to realize the flexible and diversified structural design of the battery cell 102, which is beneficial to improving the applicability and practicality of the battery cell 102.

[0213] Please refer to Figure 7-13In some embodiments, the number of battery cell bodies 32 in at least one battery cell group 32A is an odd number; and / or the number of battery cell bodies 32 in at least one battery cell group 32A is an even number.

[0214] Exemplarily, when the battery cell component 3 includes a group of battery cell groups 32A, the number of battery cell bodies 32 in the group of battery cell groups 32A can be an odd number or an even number; when the battery cell component 3 includes multiple groups of battery cell groups 32A, the number of battery cell bodies 32 in all battery cell groups 32A is an odd number, or the number of battery cell bodies 32 in all battery cell groups 32A is an even number, or the number of battery cell bodies 32 in at least one group of battery cell groups 32A is an odd number and the number of battery cell bodies 32 in at least one group of battery cell groups 32A is an even number.

[0215] For example, for a single cell group 32A, the number of cell bodies 32 can be 1, 2, 3, 4, 5, 6, 7, 8, etc. Of course, the number of cell bodies 32 in a single cell group 32A can also be 9 or more. The number of cell groups 32A can be 1, 2, 3, 4, etc. Of course, the number of cell groups 32A can also be 5 or more.

[0216] In the above technical solution, generally speaking, when the number of cell bodies 32 within a cell group 32A exceeds two, if the number of cell bodies 32 is an odd number, it is impossible to individually collapse the sides of multiple cell bodies 32. Therefore, by collapsing the center portion at once, the odd number of cell bodies 32 can be collapsed at once. This also applies to cell groups 32A with an even number of cell bodies 32. Therefore, this arrangement facilitates the realization of diversified connection arrangements for the cell bodies 32 within the battery cells 102, facilitating flexible and diversified structural designs for the battery cells, and improving the applicability and practicality of the battery cells.

[0217] The number of battery cell bodies 32 in at least one battery cell group 32A is an odd number, and the number of battery cell bodies 32 in at least one battery cell group 32A is an even number, which facilitates the diversified connection arrangement of the battery cell bodies 32 in the battery cells 102, facilitates the flexible and diversified structural design of the battery cells 102, and is beneficial to improving the applicability and practicality of the battery cells 102.

[0218] Please refer to Figure 12 and Figure 13 In some embodiments, the battery cell 102 includes m groups of cell groups 32A arranged sequentially along a first direction, where m ≥ 2 and m is a positive integer. The number of cell bodies 32 in the multiple groups 32A may be equal or unequal. This allows for a flexible design of the cell groups 32A, thereby improving the applicability and practicality of the battery cell 102.

[0219] For example, combined with Figure 11, the cell group 32A is a group, the cell group 32A includes two cell bodies 32 arranged along the first direction; for another example, the cell group 32A is a group, the cell group 32A includes three cell bodies 32 arranged along the first direction; for another example, combined Figure 12 , the battery cell group 32A is a group, and the battery cell group 32A includes four battery cell bodies 32 arranged along the first direction; for example, combined with Figure 13 For example, there are two battery cell groups 32A, and each battery cell group 32A includes four battery cell bodies 32 arranged along the first direction; for another example, there are two battery cell groups 32A, one of which includes three battery cell bodies 32, and the other includes five battery cell bodies 32; for another example, there are two battery cell groups 32A, one of which includes one battery cell body 32, and the other includes two battery cell bodies 32.

[0220] Please refer to Figure 7 、 Figures 9-13 In some embodiments, the battery cell component 3 further includes an adapter 35, through which the tab portion 332 is electrically connected to the pole body 21. Thus, by indirectly connecting the tab portion 332 to the pole body 21 via the adapter 35, the length of the tab portion 332 can be shortened, and problems such as wrinkling, bending, and breaking of the tab piece 311 can be improved. Furthermore, by flexibly designing the shape and material of the adapter 35, the difficulty of connecting to the pole body 21 can be reduced, and the connection convenience of the adapter 35 to the pole body 21 can be improved.

[0221] Illustratively, the battery 100 further includes a busbar assembly located outside the battery cell 102, which is electrically connected to the terminal body 21 to facilitate electrical connection between the multiple battery cells 102. Thus, by indirectly connecting the tab assembly 33 and the terminal body 21 via the adapter 35, electrical connection is achieved. This shortens the length of the tab assembly 33, improves its redundancy, and mitigates issues such as wrinkling, bending, and breakage of the tab sheets 311 of the tab assembly 33. Furthermore, because the tab assembly 33 is relatively short and the adapter 35 restricts the tab assembly 33 due to its connection to the tab assembly 33, the risk of short circuiting caused by reverse insertion of the tab assembly 33 into the cell body 32 is reduced. Furthermore, by flexibly designing the shape and material of the adapter 35, the difficulty of connecting the adapter 35 to the terminal body 21 and the tab assembly 33 is reduced, thereby enhancing the ease of assembly of the battery cell 102.

[0222] In addition, the perforation 40 operation of the adapter 35, the connection operation of the adapter 35 and the pole component 2 (which may not be necessary), and the connection operation of the pole component 2 and the shell component 1 are not likely to cause cracking at the connection position between the battery body 32 and the tab assembly 33, thereby improving the reliability of the battery cell 102.

[0223] There is no specific restriction on the connection method between the adapter 35 and the tab group 33, and there is no specific restriction on the connection method between the adapter 35 and the pole body 21. For example, the adapter 35 and the pole body 21 can be connected by methods including but not limited to ultrasonic welding, a combination of ultrasonic pre-welding and laser welding, resistance welding, pressure fusion welding, brazing, riveting, punching, gluing, etc.

[0224] Please refer to Figure 10 In some embodiments, the adapter 35 includes a main structure 357 and multiple branch structures 358. The main structure 357 is connected to the pole body 21. Each branch structure 358 is connected to the end of the main structure 357 away from the pole body 21, and each branch structure 358 includes at least one level branch segment 3581, so that the adapter 35 is constructed into a fractal tree structure. Each last level branch segment 3581 of the branch structure 358 supports a pole ear portion 332.

[0225] Exemplarily, each branch structure 358 includes a first-level branch segment 3581 to a p-th level branch segment 3581 arranged sequentially from the portion of the adapter 35 connected to the pole body 21 toward the portion of the adapter 35 connected to the pole lug group 33, each p-th level branch segment 3581 supports a pole lug portion 332, the main structure 357 is connected to multiple first-level branch segments 3581, each upper-level branch segment 3581 is connected to multiple lower-level branch segments 3581, for example, each first-level branch segment 3581 is connected to multiple second-level branch segments 3581, each (q-1)-th level branch segment 3581 is connected to multiple q-th level branch segments 3581, and p and q are positive integers respectively. For example, combined with Figure 10 Each branch structure 358 includes a first-level branch segment 3581, namely a first-level branch segment 3581, and the first-level branch segment 3581 supports the pole ear portion 332; for another example, each branch structure 358 includes two-level branch segments 3581, namely a first-level branch segment 3581 and a second-level branch segment 3581, each first-level branch segment 3581 is connected to multiple second-level branch segments 3581, and the second-level branch segment 3581 of each branch structure 358 supports the pole ear portion 332.

[0226] In the above technical solution, by setting the adapter 35 to form a fractal tree structure, the adapter 35 can realize the electrical connection between all battery cell bodies 32 and the pole body 21, and the adapter 35 can connect a larger number of battery cell bodies 32, and the space occupied by the adapter 35 is relatively small.

[0227] For example, the adapter 35 is constructed into a fractal tree structure, the number of the battery cell bodies 32 of the battery cells 102 can be two, three, four, five, six, seven or eight, etc., and the thickness of the battery cell component 3 can be expanded to a maximum of 120 mm.

[0228] Please refer to Figure 10 In some embodiments, the adapter 35 includes a first connection portion 351, a bending portion 353 and a second connection portion 352. The first connection portion 351 and the second connection portion 352 are opposite to each other, the bending portion 353 is bent and connected between the first connection portion 351 and the second connection portion 352, and at least a portion of the second connection portion 352 is constructed into multiple branch structures 358.

[0229] In the above technical solution, by setting a bending portion 353 to bend and connect between the first connecting portion 351 and the second connecting portion 352, and constructing at least a portion of the second connecting portion 352 into multiple branch structures 358, all the tab groups 33 are electrically connected to the same pole body 21, simplifying the structure of the adapter 35, and the bent adapter 35 can play the role of a buffer support, which is beneficial to reducing the risk of the battery cell component 3 colliding with the shell component 1 and improving the reliability of the battery cell 102.

[0230] In the above technical solution, if a part of the second connection part 352 is constructed into multiple branch structures 358, the dividing line between the main structure 357 and the branch structure 358 (or the connection position between the main structure 357 and the branch structure 358) is located on the second connection part 352; if the second connection part 352 is constructed into multiple branch structures 358, the dividing line between the main structure 357 and the branch structure 358 can be located at the connection position between the second connection part 352 and the bending part 353.

[0231] For example, when the adapter 35 supports the free end of the tab group 33, the adapter 35 can prevent the free end of the tab group 33 from being inserted into the battery cell body 32 in the direction close to the battery cell body 32, thereby reducing the risk of short circuit. At this time, if the adapter 35 includes a first connecting portion 351, a bent portion 353 and a second connecting portion 352, the bent adapter 35 can play a buffering and supporting role while achieving reliable support for the free end 331 of the tab group 33. The second connecting portion 352 supports all tab groups 33 to prevent the free ends 331 of all tab groups 33 from being inserted into the battery cell body 32, thereby improving the reliability of the battery cell 102.

[0232] Please refer to Figure 10 In some embodiments, the connection position between the main structure 357 and the branch structure 358 is located in the middle position of all m groups of battery cells 32A in the first direction. The middle position of all battery cell groups 32A in the first direction can correspond to region R'. In the first direction, the center of region R' can be the center of all battery cell groups 32A. In the first direction, the connection position between the main structure 357 and the branch structure 358 is located within region R'.

[0233] In the above technical solution, by setting the connection position between the main structure 357 and the branch structure 358 at the middle position of all battery cell groups 32A in the first direction, it is convenient to shorten the length of the branch structure 358 while the branch structure 358 reliably supports the tab group 33, which is beneficial to reducing the space occupied by the adapter 35.

[0234] Optionally, the size of the region R′ in the first direction is less than or equal to 1 / 2 of the size of one battery cell body 32 in the first direction; but the present invention is not limited thereto.

[0235] Please refer to Figure 9 In some embodiments, the tab group 33 is connected to the pole body 21 through the adapter 35, and the extension length of the adapter 35 is L1, L1>b+λ / 2, b is the extension length of the portion of the adapter 35 connected to the tab portion 332, and λ is the size of the welding surface in the first direction.

[0236] In the above technical solution, by setting the extension length L1 of the adapter 35 to be greater than a+λ / 2, the adapter 35 and the pole lug portion 332 have a larger connection length, and the adapter 35 and the pole body 21 have a larger connection length, so as to achieve a reliable electrical connection between the pole lug group 33 and the pole body 21.

[0237] Please refer to Figure 9 In some embodiments, L1≥b+λ / 2+W / 2, where W is the dimension of the pole component 2 in the first direction.

[0238] In the above technical solution, by setting the extension length L1 of the adapter 35 ≥ b + λ / 2 + W / 2, it is convenient to further make the adapter 35 and the pole ear portion 332 have a larger connection length, and the adapter 35 and the pole body 21 have a larger connection length, thereby improving the connection reliability between the pole ear group 33 and the pole body 21.

[0239] For example, in combination Figure 9 , L1=b+λ / 2+W / 2=b+c+π*R+X, which facilitates the bending of the adapter 35 , c can be any value greater than 0, and X is the length of the portion of the bending portion 353 facing the pole component 2 .

[0240] Please refer to Figure 7 and Figure 8In some embodiments, the conductive portion 36 formed after all the tab groups 33 of the battery cell group 32A, or the tab portion 332, are connected to the adapter 35 is bent to form an open slot P. As can be seen, for a solution without the adapter 35, the open slot P is formed on the tab group 33. For a solution with the adapter 35, the open slot P is formed on the tab group 33 and / or the adapter 35. The provision of the notch P enables the conductive portion 36 to act as a buffer and support, thereby reducing the risk of the battery cell component 3 colliding with the housing component 1 and improving the reliability of the battery cell 102.

[0241] Please refer to Figure 7 and Figure 8 In some embodiments, all tab groups 33 of the battery cell group 32A, or the conductive portion 36 formed after the tab portion 332 is connected to the adapter 35, are bent to form a plurality of open slots P. The plurality of open slots P are arranged sequentially from the battery cell body 32 toward the pole component 2, and the openings of two adjacent open slots P are arranged at an angle. As can be seen, for solutions without the adapter 35, the open slots P are formed on the tab group 33, in which case at least a portion of the tab group 33 has a serpentine shape. For solutions with the adapter 35, the open slots P are formed on the tab group 33 and / or the adapter 35. The above-described arrangement of the open slots P allows the conductive portion 36 to act as a buffer and support, which helps reduce the risk of the battery cell component 3 colliding with the housing component 1 and improves the reliability of the battery cell 102.

[0242] In addition, the serpentine-shaped tab group 33 or conductive portion does not extend randomly, thereby improving the mutual interference and scratching between the tab pieces 311 in the conductive portion 36, and the risk of the tab piece 311 being inserted upside down into the active battery cell body 32, thereby further improving the reliability of the battery cell 102.

[0243] For example, in combination Figure 7 The tab assembly 33 is bent to form a first opening slot 334 , so that at least a portion of the tab assembly 33 is roughly formed into a C-shape. The free end 331 defines at least a portion of the slot wall on one side of the first opening slot 334 close to the pole body 21 . The adapter 35 extends into the first opening slot 334 , and the adapter 35 abuts against the free end 331 .

[0244] In the above technical solution, by setting the adapter 35 to extend into the first open groove 334 formed by the bending of the tab group 33 and abut against the free end 331, the supporting reliability of the adapter 35 on the free end 331 can be improved. At the same time, the bent tab group 33 can play a buffering role. When the battery cell 102 is used in a vibration environment, the impact of the battery cell body 32 toward the first shell wall 111 can be reduced, thereby protecting the battery cell component 3 and improving the reliability of the battery cell 102.

[0245] It can be seen that in the embodiment of the present application, the tab group 33 can be bent to form a single open slot P or multiple open slots P. When the tab group 33 is bent to form a single open slot P, the open slot P is the first open slot 334; when the tab group 33 is bent to form multiple open slots P, the multiple open slots P include the first open slot 334 and the third open slot. In this case, the openings of two adjacent open slots P can be arranged at an angle, for example, the openings of two adjacent open slots P are arranged at an obtuse angle, or the openings of two adjacent open slots P are arranged at a 180° angle.

[0246] Please refer to Figure 7 In some embodiments of the present application, the adapter 35 is bent to form a second opening slot 355, the second opening slot 355 is adjacent to the first opening slot 334, and the second opening slot 355 is located on the side of the first opening slot 334 facing the pole body 21, and the opening directions of the second opening slot 355 and the first opening slot 334 are arranged at an angle.

[0247] It can be seen that in the direction from the pole body 21 to the cell body 32, the first opening groove 334 and the second opening groove 355 are adjacently arranged (for example Figure 7 As shown, the first opening slot 334 and the second opening slot 355 are adjacent to each other vertically, the opening of the first opening slot is generally facing left, and the opening of the second opening slot is generally facing right).

[0248] As a result, the conductive portion 36 formed by the tab assembly 33 and the adapter 35 can present a reciprocating, serpentine shape. The conductive portion 36 can act as a buffer. When the battery cell 102 is used in a vibrating environment, it can reduce the impact of the battery cell body 32 against the first shell wall 111, thereby protecting the battery cell component 3 and improving the reliability of the battery cell 102. Moreover, because the conductive portion 36 does not extend randomly, it can reduce the risk of interference and scratching between the tabs 311 in the conductive portion 36, as well as the risk of the tab 311 being inserted into the active battery cell body 32, thereby further improving the reliability of the battery cell 102.

[0249] For example, please refer again to Figure 7 The tab assembly 33 includes a bent, connected tab portion 332 and a gathered portion 333, which form opposite sides of the first opening slot 334. The adapter 35 includes a bent, connected first connecting portion 351 and a second connecting portion 352, which form opposite sides of the second opening slot 355. This allows the conductive portion 36 to assume a reciprocatingly bent S-shape, shortening its length, simplifying its structure, and facilitating its processing.

[0250] Please refer to Figure 7 and Figure 14 In some embodiments, the end of the adapter 35 away from the pole body 21 has a clamping structure 356, the clamping structure 356 includes two oppositely arranged clamping portions 3561, the pole ear portion 332 is clamped between the two clamping portions 3561, and the pole ear portion 332 is connected to each clamping portion 3561, then the two clamping portions 3561 are respectively arranged on both sides of the thickness of the pole ear portion 332.

[0251] For example, one end of the adapter 35 having the clamping structure 356 can be roughly Y-shaped, and the two forks of the Y-shaped structure can respectively form two clamping portions 3561, the pole ear portion 332 is clamped between the two forks, and the pole ear portion 332 is electrically connected to each fork.

[0252] In the above technical solution, by clamping the pole ear portion 332 between the two clamping portions 3561, the two clamping portions 3561 can be used to limit the pole ear portion 332, which is beneficial to improving the connection reliability of the multiple pole ear sheets 311 of the pole ear group 33 on the pole ear portion 332, and improving the connection reliability of the pole ear group 33 and the adapter 35; moreover, one of the two clamping portions 3561 arranged adjacent to the battery cell body 32 is convenient for supporting the pole ear portion 332 of the pole ear group 33, and is supported on the side of the pole ear portion 332 of the pole ear group 33 away from the pole column body 21, so as to prevent the pole ear portion 332 of the pole ear group 33 from moving toward the battery cell body 32, thereby reducing the risk of inverted insertion.

[0253] Furthermore, when the tab portion 332 is secured to each clamping portion 3561 (e.g., by welding), the tab portion 332 can first be positioned between the two clamping portions 3561, and then pressure can be applied to the opposing sides of the two clamping portions 3561 to achieve connection. The two clamping portions 3561 can then isolate the tab portion 332 from the pressure-applying device, thereby protecting the tab portion 332 of the tab assembly 33. The pressure-applying device will not come into contact with the tab portion 332 of the tab assembly 33, thereby reducing the risk of cracking in the tab sheet 311 of the tab assembly 33 due to its thinness. This helps improve the welding quality and connection reliability between the tab assembly 33 and the adapter 35. In particular, when the thickness of the clamping portions 3561 is greater than the thickness of a single tab sheet 311, the clamping portions 3561 can effectively protect the tab sheet 311, reducing the risk of cracking in the tab sheet 311 during connection.

[0254] In some examples, for the structure in which the pole ear portion 332 of the pole ear group 33 is clamped between the two clamping portions 3561: during the processing of the battery cell 102, the pole ear portion 332 is located at the free end 331 of the pole ear group 33, and the free end 331 of the pole ear group 33 can first form the pole ear portion 332, and then at least part of the pole ear portion 332 is set between the two clamping portions 3561, and the pole ear portion 332 is connected to both clamping portions 3561. In short, the multiple pole ear sheets 311 of the pole ear group 33 are first pre-connected (for example, pre-welded) at the free end 331 to form the pole ear portion 332, and then the pole ear portion 332 is connected to the clamping structure 356; or, the free end 331 of the pole ear group 33 can first be folded to form a laminated portion. 312, at least a portion of the laminate portion 312 is disposed between the two clamping portions 3561, and the laminate portion 312 is connected to both clamping portions 3561. It can be seen that while the laminate portion 312 is connected to the two clamping portions 3561, the multiple tabs 311 of the laminate portion 312 are connected, so that the free ends 331 of the tab group 33 simultaneously form the tab portion 332. In short, the multiple tabs 311 of the tab group 33 are simply gathered at the free ends 331 to form the laminate portion 312. While the laminate portion 312 is connected to the clamping structure 356, the multiple tabs 311 of the laminate portion 312 are simultaneously connected to form the tab portion 332. This method can save the pre-connection process of the multiple tabs 311 at the free ends 331. Specifically, the multiple tabs 311 of the tab group 33 are merely brought together but not connected when forming the laminate portion 312 at the free ends 331.

[0255] Of course, in other embodiments of the present application, the clamping structure 356 may not be provided at the end of the adapter 35 away from the pole body 21. For example, the end of the adapter 35 away from the pole body 21 is formed into a flat plate structure, and the flat plate structure can be supported on the end of the pole ear portion 332 of the pole ear group 33 away from the pole body 21. Similarly, the adapter 35 can support the pole ear portion 332 of the pole ear group 33, thereby achieving the purpose of preventing the pole ear portion 332 of the pole ear group 33 from moving toward the battery cell body 32.

[0256] Please refer to Figure 7 In some embodiments of the present application, the adapter 35 includes a first connection portion 351, a bending portion 353 and a second connection portion 352. The first connection portion 351 and the second connection portion 352 are opposite to each other, and the bending portion 353 is bent and connected between the first connection portion 351 and the second connection portion 352. The first connection portion 351 is connected to the pole body 21, and the second connection portion 352 is connected to the pole ear portion 332.

[0257] Therefore, the bent adapter 35 can play a role of buffer support while reliably supporting the free end 331 of the tab assembly 33, which is beneficial to reducing the risk of the battery core component 3 colliding with the shell component 1 and improving the reliability of the battery cell 102.

[0258] In some examples, combined Figure 7 The adapter 35 is generally C-shaped or U-shaped, with the first connecting portion 351 generally being a flat plate structure. The first connecting portion 351 is laid on the inner end surface 211 of the pole body 21. The surface on one side of the thickness of the first connecting portion 351 is connected to the inner end surface 211 of the pole body 21. The area of ​​the inner end surface 211 of the pole body 21 is greater than or equal to the area of ​​the surface on the thickness side of the first connecting portion 351. The first connecting portion 351 can completely fall on the inner end surface 211 of the pole body 21, thereby facilitating an increase in the connection area between the inner end surface 211 of the pole body 21 and the first connecting portion 351, thereby improving current flow efficiency. In some other examples, the adapter 35 is generally L-shaped, with the first connecting portion 351 generally being a flat plate structure. The end surface of the first connecting portion 351, which is away from the second connecting portion 352, is connected to the inner end surface 211 of the pole body 21.

[0259] For example, in combination Figure 7 At least part of the second connecting portion 352 supports the tab portion 332 , and the second connecting portion 352 supports the free end 331 of the tab group 33 , thereby improving the redundancy of the tab group 33 and reducing the risk of short circuit caused by the tab group 33 being inserted upside down into the battery cell body 32 .

[0260] In some examples, combined Figure 7 The second connecting portion 352 is configured as a clamping structure 356, and includes two oppositely disposed clamping portions 3561. The thickness of the second connecting portion 352 is equal to the thickness of the clamping structure 356, that is, the sum of the thicknesses t5 of the two clamping portions 3561. The free end 331 is sandwiched between the two clamping portions 3561, and the free end 331 is connected to each clamping portion 3561. Of course, in some other examples, the second connecting portion 352 can also be configured as a flat plate structure, with the second connecting portion 352 supported on the side of the free end 331 of the tab assembly 33 facing away from the pole body 21, so that the free end 331 of the tab assembly 33 is located between the second connecting portion 352 and the pole body 21.

[0261] Please refer to Figure 7 and Figure 14 In some embodiments of the present application, the thickness of the bending portion 353 is smaller than the thickness of at least one of the first connection portion 351 and the second connection portion 352; and / or, in the extension direction of the central axis of the bending portion 353, the width of the bending portion 353 is smaller than the width of at least one of the first connection portion 351 and the second connection portion 352.

[0262] For example, combined with Figure 7 and Figure 14, the thickness of the bending portion 353 is t3, the thickness of the first connecting portion 351 is t1, the thickness of the second connecting portion 352 is t2, t3<t1 and / or t3<t2; and / or, the width of the bending portion 353 is d3, the width of the first connecting portion 351 is d1, the width of the second connecting portion 352 is d2, d3<d1 and / or d3<d2.

[0263] In the above technical solution, by setting the thickness of the bending portion 353 to be smaller than the thickness of at least one of the first connection portion 351 and the second connection portion 352, and the width of the bending portion 353 to be smaller than the width of at least one of the first connection portion 351 and the second connection portion 352, the thickness of the bending portion 353 is reduced and the width is shortened, so that the first connection portion 351 and the second connection portion 352 have a certain rigidity respectively, thereby realizing a reliable connection between the adapter 35 and the pole body 21, and a reliable connection between the adapter 35 and the tab group 33. At the same time, the bending portion 353 is weakened, which facilitates the adapter 35 to bend at the bending portion 353. In particular, for the case where the structure of the adapter 35 is roughly plate-shaped before assembly and there is a bending position in its structure after assembly, the adapter 35 can realize a soft connection between the pole body 21 and the battery cell body 32, which facilitates the adapter 35 to bend smoothly at the bending portion 353 during the assembly process, thereby improving the assembly convenience.

[0264] Of course, the shape of the adapter 35 before and after assembly can also be the same. For example, the adapter 35 is configured such that the bent portion 353 bends and connects the first connection portion 351 and the second connection portion 352 before and after assembly. In this case, the adapter 35 can achieve a hard connection between the electrode body 21 and the battery cell body 32. It can be seen that in the embodiment of the present application, whether the adapter 35 is used to achieve a soft connection or a hard connection, it can support the free end 331 of the tab assembly 33.

[0265] In some examples, the thickness of the first connecting portion 351 and the second connecting portion 352 is greater than the thickness of the bent portion 353. In this case, a first groove may be formed on at least one of the two sides of the thickness of the bent portion 353 to reduce the thickness of the bent portion 353. In other examples, the width of the first connecting portion 351 and the second connecting portion 352 is greater than the width of the bent portion 353. In this case, a second groove may be formed on at least one of the two sides of the width of the bent portion 353 to reduce the width of the bent portion 353.

[0266] Please refer to Figure 14 and Figure 15In some embodiments of the present application, the adapter 35 includes a plurality of adapter foils 350, which are stacked and partially connected to form a first connection portion 351 and a second connection portion 352. The first connection portion 351 and the second connection portion 352 are spaced apart, the first connection portion 351 is connected to the pole body 21, and the second connection portion 352 is connected to the pole ear portion 332.

[0267] It should be noted that, for the first connecting portion 351, any two adjacent transfer foils 350 among the multiple transfer foils 350 are directly connected or indirectly connected; for the second connecting portion 352, any two adjacent transfer foils 350 among the multiple transfer foils 350 are directly connected or indirectly connected, for example, two adjacent transfer foils 350 are indirectly connected through the pole ear portion 332 of the pole ear group 33.

[0268] Exemplarily, partial areas of the stacked plurality of transition foils 350 are directly connected to form a first connection portion 351, and another partial area of ​​the stacked plurality of transition foils 350 is directly connected to a second connection portion 352, and the second connection portion 352 is connected to the pole ear portion 332 of the pole ear group 33. At this time, the portions of the plurality of transition foils 350 corresponding to the second connection portion 352 are all located on the same side of the pole ear portion 332 of the pole ear group 33; or, the adapter 35 includes two transition foils 350, and partial areas of the two transition foils 350 stacked are directly connected to form the first connection portion 351, and another partial area of ​​the two transition foils 350 stacked is indirectly connected through the pole ear portion 332 of the pole ear group 33, so that the adapter 35 forms the second connection portion 352, and at this time, the two transition foils 350 corresponding to the second connection portion 352 are connected to the pole ear portion 332 of the pole ear group 33. They are respectively located on opposite sides of the pole ear portion 332 of the pole ear group 33; or, the adapter 35 includes four adapter foils 350, and a part of the stacked area of ​​the four adapter foils 350 is connected to form a second connection portion 352. At this time, two of the adapter foils 350 corresponding to the second connection portion 352 are located on one side of the thickness of the pole ear portion 332, and the remaining two adapter foils 350 corresponding to the second connection portion 352 are located on the other side of the thickness of the pole ear portion 332. Then, the two adapter foils 350 of the second connection portion 352 located on the same side of the pole ear portion 332 are directly connected, and the adapter foils 350 of the second connection portion 352 located on the opposite side of the pole ear portion 332 are indirectly connected through the pole ear portion 332; of course, the number of adapter foils 350 of the adapter 350 is not limited to two or four, and can also be three, five or more than five.

[0269] In the above technical solution, by setting the adapter 35 to include multiple stacked adapter foils 350, the number of adapter foils 350 and the structure and size of a single adapter foil 350 can be flexibly set, so that the adapter 35 has a flexible structure and size design, thereby improving the applicability and practicality of the adapter 35, which is beneficial to reducing the difficulty of connection with the pole body 21 and reducing the difficulty of connection with the pole ear group 33, thereby improving the convenience of assembly.

[0270] In addition, since partial areas of the stacked multiple adapter foils 350 are connected to form the first connecting portion 351 and the second connecting portion 352 set at intervals, the surfaces of the two adjacent adapter foils 350 facing each other are partially connected but not completely connected, which is beneficial to reducing the processing steps of the adapter 35; moreover, since the thickness of a single adapter foil 350 is smaller than the thickness of the adapter 35, the multiple adapter foils 350 are equivalent to a multi-layer thin plate. The adapter 35 formed by the multiple adapter foils 350 is easier to bend than the one-piece molded adapter sheet. At the same time, the stiffness of some areas of the adapter 35 is relatively small, which facilitates the bending of the adapter 35 in the above-mentioned area with smaller stiffness during the assembly process of the battery cell 102. Therefore, the setting of the above-mentioned adapter 35 facilitates the realization of a soft connection between the tab group 33 and the pole body 21, so that the adapter 35 is bent into a certain shape during the assembly process of the battery cell 102, thereby meeting the design requirements. For example, the plurality of transfer foils 350 may be welded at several key locations by ultrasonic welding or other methods, so as to connect the plurality of transfer foils 350 together.

[0271] Please refer to Figure 7 In some embodiments of the present application, the portion of the adapter 35 between the first connection portion 351 and the second connection portion 352 forms a third connection portion 354 , and the third connection portion 354 is bent to connect the first connection portion 351 and the second connection portion 352 .

[0272] It is understood that in the portion of the adapter 35 corresponding to the third connection portion 354 of the multiple adapter foils 350, if two adjacent adapter foils 350 are not connected, the third connection portion 354 has a lower rigidity than the first connection portion 351 and the second connection portion 352, making it easier to bend at the third connection portion 354. This facilitates assembly when the adapter 35 changes its structural form during assembly, for example, when the third connection portion 354 is not bent before assembly and is bent to form a bent portion 353 after assembly. Furthermore, the bent adapter 35 can act as a buffer while reliably supporting the free end 331 of the tab assembly 33, thereby reducing the risk of the cell component 3 impacting the housing component 1 and improving the reliability of the battery cell 102.

[0273] Please refer to Figure 7 、 Figure 14and Figure 15 In some embodiments of the present application, the plurality of transition foils 350 include at least one first transition foil 3501 and at least one second transition foil 3502 , and the first transition foil 3501 and the second transition foil 3502 are respectively connected to both sides of the thickness of the free end 331 .

[0274] In the above technical solution, by arranging the first adapter foil 3501 and the second adapter foil 3502 to be connected to both sides of the thickness of the free end 331 respectively, the free end 331 can be separated from the pressurizing device by the first adapter foil 3501 and the second adapter foil 3502 to protect the free end 331, thereby reducing the risk of the tab sheet 311 of the tab group 33 being easily cracked due to its thin thickness, which is beneficial to improving the welding quality between the tab group 33 and the adapter 35, and improving the connection reliability between the tab group 33 and the adapter 35.

[0275] It can be understood that the number of the first transfer foils 3501 and the number of the second transfer foils 3502 can be equal or different, and the number of all transfer foils 350 of the adapter 35 can be an odd number or an even number.

[0276] Exemplarily, the plurality of transfer foils 350 include at least one first transfer foil 3501 and at least one second transfer foil 3502, the first transfer foil 3501 and the second transfer foil 3502 being respectively connected to both sides of the thickness of the free end 331, all the first transfer foils 3501 located on the same side of the thickness of the free end 331 can be constructed into a clamping portion 3561, and all the second transfer foils 3502 located on the same side of the thickness of the free end 331 can be constructed into a clamping portion 3561, to facilitate the forming of the clamping structure 356.

[0277] Please refer to Figure 7 In some embodiments, all the tab groups 33 of the battery cell group 32A are gathered and bent to form open slots. The adapter 35 includes a first connecting portion 351 and a second connecting portion 352. The first connecting portion 351 is connected to the pole column component 2, and the second connecting portion 352 extends into one of the open slots. The second connecting portion 352 is connected to the tab portion 332 to support the tab portion 332, so as to prevent the tab portion 332 from moving toward the battery cell body 32.

[0278] For example, at least a portion of the second connection portion 352 can be supported on the side of the pole ear portion 332 of the pole ear group 33 facing the battery cell body 32, that is, at least a portion of the second connection portion 352 can be supported on the side of the pole ear portion 332 of the pole ear group 33 facing away from the pole post body 21, so that the pole ear portion 332 of the pole ear group 33 is located between the portion of the adapter 35 supporting the pole ear portion 332 and the inner end surface 211 of the pole post body 21. The above-mentioned supporting arrangement of the adapter 35 can prevent the pole ear portion 332 from moving toward the battery cell body 32. For example, when the pole ear group 33 is subjected to external force so that the pole ear group 33 has a tendency to move toward the battery cell body 32, the adapter 35 can apply a reaction force to the pole ear portion 332 to hinder the movement tendency of the pole ear portion 332 toward the battery cell body 32, thereby reducing the risk of the pole ear group 33 moving toward the battery cell body 32 and being inserted into the battery cell body 32 to cause a short circuit, which is beneficial to improving the reliability of the battery cell 102.

[0279] In the embodiment of the present application, each group of tab groups 33 includes multiple tab sheets 311, and all the tab sheets 311 of the battery cell group 32A converge and connect at a position away from the battery cell body 32 to form a tab portion 332, and at least part of the tab portion 332 is connected to a position on the side away from the battery cell body 32 of at least part of the second connecting portion 352, then the tab portion 332 is located at the free end 331 of the tab group 33, and the "free end 331 of the tab group 33" can be understood as the end of the tab group 33 away from the battery cell body 32 in the extension direction of the tab group 33. The tab group 33 has a first end and a second end in its extension direction, the first end is connected to the battery cell component 3, and the second end is the free end 331 of the tab group 33; the "inner end surface 211 of the pole column body 21" is the end surface of the pole column body 21 facing the battery cell component 3. In some examples, the inner end face 211 of the pole body 21 is electrically connected to the adapter 35, which can reduce the difficulty of assembling and connecting the adapter 35 and the pole body 21 and improve processing efficiency. Compared with connecting the adapter 35 to other parts of the pole body 21, it is beneficial to shorten the length of the adapter 35 and save materials and costs. Of course, in other examples, the adapter 35 can also be electrically connected to other parts of the pole body 21.

[0280] It should be noted that in the embodiment of the present application, the adapter 35 supports the tab portion 332 of the tab assembly 33, such that the tab portion 332 of the tab assembly 33 is located between the portion of the adapter 35 that supports the tab portion 332 and the inner end surface 211 of the pole body 21. The tab portion 332 of the tab assembly 33 and the inner end surface 211 of the pole body 21 may be in contact or spaced apart. When the tab portion 332 of the tab assembly 33 is spaced apart from the inner end surface 211 of the pole body 21, a portion of the adapter 35 (e.g., the first connecting portion 351 described above) may be located between the tab portion 332 of the tab assembly 33 and the inner end surface 211 of the pole body 21, or no portion of the adapter 35 may be located between the tab portion 332 of the tab assembly 33 and the inner end surface 211 of the pole body 21.

[0281] It should be noted that in the embodiment of the present application, the tabs 311 are divided into positive electrode tabs 311 and negative electrode tabs 311. The positive electrode tabs 311 that need to be gathered together are stacked together and connected (e.g., by ultrasonic pre-welding) to form the positive electrode tab portion 332. This can reduce the interlayer gaps at the free end 331 of the tab group 33, allowing the multiple fluffy positive electrode tabs 311 to form a sheet structure with a certain degree of rigidity at the free end 331. Similarly, the negative electrode tabs 311 that need to be gathered together are stacked together and connected (e.g., by ultrasonic pre-welding) to form the negative electrode tab portion 332. This can reduce the interlayer gaps at the free end 331 of the tab group 33, allowing the multiple fluffy negative electrode tabs 311 to form a sheet structure with a certain degree of rigidity at the free end 331.

[0282] Please refer to Figure 7 In some embodiments, the orthographic projection of at least part of the pole ear portion 332 on the first shell wall 111 is located within the orthographic projection range of the second connecting portion 352 on the first shell wall 111, and the thickness t2 of the second connecting portion 352 is greater than or equal to the thickness t4 of the pole ear portion 332.

[0283] In the above technical solution, by setting the orthographic projection of the supported portion of the pole ear portion 332 (i.e., at least a portion of the pole ear portion 332) on the first shell wall 111 to be located within the orthographic projection range of the second connecting portion 352, and the thickness of the second connecting portion 352 is greater than or equal to the thickness of the pole ear portion 332, the cross-sectional area of ​​the second connecting portion 352 can be made greater than or equal to the cross-sectional area of ​​the pole ear portion 332, which is beneficial to reducing the resistance at the connection position between the second connecting portion 352 and the pole ear portion 332 and improving the flow capacity at the connection position between the second connecting portion 352 and the pole ear portion 332, thereby facilitating the reduction of the internal resistance of the battery cell 102 and improving the flow capacity of the battery cell 102.

[0284] Exemplarily, the first direction is perpendicular to the first shell wall 111, with the surface of the first shell wall 111 being the projection surface and the first direction being the projection direction. The orthographic projection of the portion of the pole ear portion 332 supported by the adapter 35 is located within the orthographic projection range of the second connecting portion 352. Then, the size of the pole ear portion 332 in the second direction is less than or equal to the size of the second connecting portion 352 in the second direction, and the size of the pole ear portion 332 in the third direction is less than or equal to the size of the second connecting portion 352 in the third direction.

[0285] Please refer to Figure 7 In some embodiments of the present application, multiple tab sheets 311 of the tab group 33 converge near the position of the battery cell body 32 to form a gathered portion 333, one end of the gathered portion 333 is bent and connected to the tab portion 332, and the other end of the gathered portion 333 is connected to the battery cell body 32, and the end surface of the portion where the second connecting portion 352 is connected to the tab portion 332 extends to a position close to the bend of the gathered portion 333.

[0286] In the above technical solution, the gathering portion 333 is bent and connected to the pole ear portion 332, so that the pole ear group 33 can be bent to form a first open groove 334. The pole ear portion 332 and the gathering portion 333 are respectively the two side groove walls opposite to each other of the first open groove 334. The end face of the portion of the adapter 35 used to support the free end 331 extends to a position close to the bending position of the gathering portion 333, so that the end face of the portion of the adapter 35 used to support the free end 331 extends beyond the pole ear portion 332, so that the adapter 35 supports the entire pole ear portion 332.

[0287] In the above technical solution, by setting one end of the gathering portion 333 to be bent and connected to the pole ear portion 332, the end surface of the portion where the adapter 35 is connected to the pole ear portion 332 extends to a position close to the bending of the gathering portion 333, so that the adapter 35 can support the entire pole ear portion 332 and improve the supporting reliability of the free end 331; at the same time, since the multiple pole ear pieces 311 of the pole ear group 33 are only gathered together but not connected when forming the gathering portion 333, the adapter 35 can have a certain indirect pressure effect on the bending position of the gathering portion 333, so as to improve the tightness of the gathering portion 333, so that the gathering portion 333 maintains the preset gathering shape and cannot be dispersed, which is beneficial to reduce the risk of the gathering portion 333 being inserted upside down into the battery cell body 32.

[0288] In the embodiment of the present application, “the multiple tabs 311 of the tab group 33 converge and connect at a position close to the battery cell body 32 to form the tab portion 332, and the multiple tabs 311 of the tab group 33 converge at a position away from the battery cell body 32 to form the gathered portion 333” is intended to illustrate that: along the extension direction of the tab 311, the gathered portion 333 and the tab portion 332 are arranged in sequence along the direction away from the battery cell body 32, and the specific positions of the tab portion 332 and the gathered portion 333 are not limited, that is, there is no requirement for a certain distance between the gathered portion 333 and the battery cell body 32, nor for a certain distance between the tab portion 332 and the battery cell body 32. In some optional examples, the current collector of the battery cell body 32 and the tab 311 can be an integral part. For example, for the positive electrode sheet, it can be an integrally formed aluminum foil, and for the negative electrode sheet, it can be an integrally formed copper foil, and so on.

[0289] Please refer to Figures 16-21 In some embodiments of the present application, the battery cell 102 further includes an insulating component 4, which is disposed in the accommodating cavity 13, and a through-hole 40 is formed on the insulating component 4. The insulating component 4 blocks the portion of the tab group 33 and / or the adapter 35 that passes through the through-hole 40 to the side of the insulating component 4 away from the battery cell body 32 and the battery cell body 32. Then, the insulating component 4 blocks the portion of the tab group 33 that passes through the through-hole 40 to the side of the insulating component 4 away from the battery cell body 32 and the battery cell body 32, and / or the insulating component 4 blocks the portion of the adapter 35 that passes through the through-hole 40 to the side of the insulating component 4 away from the battery cell body 32 and the battery cell body 32.

[0290] It can be seen that at least part of the insulating component 4 is arranged between the end of the connecting tab group 33 of the battery cell body 32 and the pole body 21, and the perforation 40 can be used for the tab group 33 and / or the adapter 35 to pass through, so that the tab group 33 and / or the adapter 35 can be passed through the side of the insulating component 4 away from the battery cell body 32 to be electrically connected to the pole body 21. Therefore, the insulating component 4 can be used to isolate the battery cell body 32 from the first shell wall 111 of the shell part 1, reducing the probability of the battery cell body 32 contacting the first shell wall 111 of the shell part 1, thereby reducing the risk of the battery cell body 32 being corroded by the first shell wall 111 of the shell part 1 due to leakage, reducing the risk of the battery cell body 32 itself failing, and reducing the risk of leakage, thereby improving the reliability and stability of the battery cell 102.

[0291] Moreover, if the end of the battery cell body 32 is connected to a conductive part 36, the conductive part 36 is electrically connected to the pole body 21, and the conductive part 36 includes a tab group 33 and a adapter 35. Since the insulating part 4 is blocked between the tab group 33 and / or the adapter 35 and the battery cell body 32, the insulating part 4 is blocked between the conductive part and the battery cell body 32. The part of the insulating part 4 is passed through the perforation 40 to the side of the insulating part 4 away from the battery cell body 32, so that the part of the conductive part passed through the insulating part 4 away from the battery cell body 32 is separated from the battery cell body 32, thereby reducing the probability of the conductive part being inserted upside down into the battery cell body 32 due to redundancy, etc., thereby reducing the risk of short circuit in the battery cell 102 and improving the reliability of the battery cell 102.

[0292] For example, if the tab group 33 is passed through the through-hole 40, a portion of the tab group 33 is passed through the through-hole 40 to the side of the insulating component 4 facing away from the cell body 32, and the adapter 35 can be located as a whole on the side of the insulating component 4 facing away from the cell body 32 through the through-hole 40. At this time, the insulating component 4 can be blocked between the portion of the tab group 33 passed through the insulating component 4 on the side facing away from the cell body 32 and the cell body 32, and / or blocked between the adapter 35 and the cell body 32; if the adapter 35 is passed through the through-hole 40, a portion of the adapter 35 and the tab group 33 are located on the side of the insulating component 4 facing the cell body 32, and another portion of the adapter 35 is located on the side of the insulating component 4 facing away from the cell body 32. At this time, the insulating component 4 can be blocked between the above-mentioned other portion of the adapter 35 and the cell body 32.

[0293] Please refer to Figure 16 and Figure 17 In some embodiments of the present application, the insulating component 4 includes an insulating film 41, and the insulating film 41 fully covers the battery cell body 32. The insulating film 41 covers all surfaces of the battery cell body 32, so that the insulating film 41 can isolate the outer surface of the battery cell body 32 from the shell component 1, reducing the risk of the shell component 1 being corroded due to leakage of the battery cell body 32, reducing the risk of failure of the battery cell body 32 itself, and reducing the risk of leakage, thereby improving the reliability and stability of the battery cell 102.

[0294] Among them, a through-hole 40 is formed at a position of the insulating film 41 opposite to the first shell wall 111, and the portion of the insulating film 41 surrounding the through-hole 40 is blocked between the portion of the tab group 33 penetrating through the through-hole 40 to the side of the insulating film 41 facing the pole body 21 and the battery cell body 32, and the portion of the insulating film 41 surrounding the through-hole 40 is blocked between the portion of the tab group 33 penetrating through the through-hole 40 to the side of the insulating film 41 facing away from the battery cell body 32 and the battery cell body 32.

[0295] In the above technical solution, since the portion of the insulating film 41 surrounding the through-hole 40 is blocked between the portion of the tab group 33 that passes through the through-hole 40 to the side of the insulating film 41 facing the pole body 21 and the battery body 32, it is convenient to make the size of the through-hole 40 on the insulating film 41 adaptable to the size of the tab group 33. For example, the size of the first avoidance hole is adapted to the thickness of the portion of the tab group 33 located at the first avoidance hole. On the one hand, the through-hole 40 allows the tab group 33 to pass through smoothly to be electrically connected to the pole body 21. On the other hand, the tab group 33 is allowed to pass through smoothly when passing through. When the hole 40 is in the state, the insulating film 41 can still cover the multiple tab sheets 311 of the tab group 33 near the root of the battery cell body 32, further realizing insulation protection for the battery cell body 32 and reducing the risk of naked leakage of the battery cell body 32. At the same time, the portion of the tab group 33 passing through the hole 40 can be separated from the battery cell body 32, reducing the redundancy of the tab group 33 and / or the adapter 35, etc., which may cause them to be inserted upside down into the battery cell body 32, and the probability of the tab group 33 being near the root of the battery cell body 32, which is beneficial to further reduce the risk of short circuit of the battery cell 102.

[0296] In some examples, the perforations 40 in the insulating film 41 are normally open holes adapted to the size of the tab assembly 33. That is, when the insulating film 41 is in a natural state (when the insulating film 41 is not squeezed by the tab assembly 33), the size of the perforations 40 is greater than zero. This allows the tab assembly 33 to quickly pass through the insulating film 41, which helps improve the efficiency of the insulating film 41 wrapping the battery cell body 32, thereby improving the assembly efficiency of the battery cell 102. Furthermore, the tab assembly 33 can avoid the insulating film 41 during its passage through the insulating film 41, thereby reducing the probability of deformation of the tab assembly 33 and reducing the number of steps required to reshape the tab assembly 33, thereby improving the assembly efficiency of the battery cell 102.

[0297] In some other examples, a tearing structure 411 is provided at a position of the insulating film 41 opposite to the first shell wall 111. The tearing structure is adapted to be torn by the tab assembly 33 to form a through-hole 40. For example, during the process of wrapping the insulating film 41 around the outer side of the cell body 32, when the tab assembly 33 pushes open the tearing structure on the insulating film 41, a closable through-hole 40 can be formed in the insulating film 41, allowing the tab assembly 33 to be smoothly passed through the through-hole 40. Furthermore, since the through-hole 40 has a self-closing property, after the tab assembly 33 is passed through, the through-hole 40 can gradually close, allowing the insulating film 41 to cover at least a portion of the root of the multiple tab sheets 311 of the tab assembly 33 adjacent to the cell body 32.

[0298] Therefore, by setting up a tearing structure, insulation protection can be formed for the multiple pole tabs 311 of the pole tab group 33 adjacent to the root of the battery cell body 32, so that the part of the pole tab group 33 passing through the perforation 40 is separated from the multiple pole tabs 311 of the pole tab group 33 adjacent to the root of the battery cell body 32, reducing the probability of the pole tab group 33 being inserted upside down into the interior of the battery cell body 32 due to redundancy, and the probability of the multiple pole tabs 311 of the pole tab group 33 being inserted upside down into the root of the battery cell body 32, thereby reducing the risk of short circuit in the battery cell 102.

[0299] Please refer to Figures 18-21 In some embodiments of the present application, the insulating component 4 includes an insulating bracket 42, which is arranged on the side of the battery cell body 32 facing the first shell wall 111, so as to facilitate supporting the battery cell body 32 through the insulating bracket 42 and separating the battery cell body 32 from the first shell wall 111, thereby reducing the probability of contact between the battery cell body 32 and the first shell wall 111, which is beneficial to reducing the risk of the first shell wall 111 being corroded due to leakage of the battery cell body 32, reducing the risk of leakage, and improving the reliability and stability of the battery cell 102.

[0300] Among them, a through-hole 40 is formed at the position of the insulating bracket 42 opposite to the pole component 2, and the part of the insulating bracket 42 surrounding the through-hole 40 is blocked between the adapter 35 and the battery cell body 32. At this time, the adapter 35 can be located on the side of the insulating bracket 42 away from the battery cell body 32, and the tab group 33 is passed through the through-hole 40 on the insulating bracket 42.

[0301] In the above technical solution, since the part of the insulating bracket 42 surrounding the through-hole 40 is blocked between the adapter 35 and the battery cell body 32, the insulating bracket 42 can play a certain supporting role on the adapter 35, and the adapter 35 supports the free end 331 of the tab group 33. Then, the insulating bracket 42 can insulate and separate the free end 331 of the tab group 33 from the battery cell body 32, reducing the probability of the free end 331 of the tab group 33 being inserted into the battery cell body 32, and the probability of the tab group 33 being inserted into the root of the battery cell body 32, thereby reducing the risk of short circuit and improving the reliability of the battery cell 102.

[0302] Furthermore, the insulating bracket 42 abuts against the end of the adapter 35 facing the battery cell body 32, and the insulating bracket 42 can play a certain indirect supporting role on the free end 331 of the tab group 33 through the adapter 35, thereby improving the supporting reliability of the free end 331 of the tab group 33, further reducing the probability of the tab group 33 being inserted upside down into the battery cell body 32, and the probability of the tab group 33 being inserted upside down into the root of the battery cell body 32 adjacent to the battery cell body 32, reducing the risk of short circuit, and improving the reliability of the battery cell 102.

[0303] Please refer to Figure 18 and Figure 19In some embodiments of the present application, the insulating component 4 includes an insulating bracket 42, and the through-hole 40 on the insulating bracket 42 has a first hole wall and a second hole wall arranged opposite to each other in the width direction of the pole body 21. The insulating bracket 42 includes a bracket body and a first separator. The bracket body is arranged at the end of the battery cell body 32 facing the first shell wall 111, and the first separator is arranged at the first hole wall, and the first separator is connected to the bracket body. The first separator extends in a direction close to the center of the through-hole 40, and the first separator is blocked between the adapter 35 and the battery cell body 32; at this time, the insulating bracket 42 does not include the second separator described below.

[0304] It is understandable that the first separator may be parallel to the width direction of the pole body 21 or inclined relative to the width direction of the pole body 21 .

[0305] Please refer to Figure 20 and Figure 21 In some embodiments of the present application, the insulating component 4 includes an insulating bracket 42. The through-hole 40 on the insulating bracket 42 has a first hole wall and a second hole wall arranged opposite each other in the width direction of the electrode body 21. The insulating bracket 42 includes a bracket body, a first separator, and a second separator. The bracket body is disposed at the end of the battery cell body 32 facing the first shell wall 111. The first separator is disposed at the first hole wall and connected to the bracket body. The first separator extends toward the center of the through-hole 40 and is blocked between the adapter 35 and the battery cell body 32. The second separator is disposed at the second hole wall and connected to the bracket body. The second separator extends toward the center of the through-hole 40. It can be seen that the first separator and the second separator are spaced apart to form the through-hole 40 therebetween.

[0306] It is understandable that the second separator may be parallel to the width direction of the pole body 21 or inclined relative to the width direction of the pole body 21 .

[0307] In some embodiments of the present application, the insulating component 4 includes an insulating film 41 and an insulating bracket 42. The insulating film 41 fully encloses the cell body 32. A through-hole 40 is formed in the insulating film 41 at a position opposite the first shell wall 111. The portion of the insulating film 41 surrounding the through-hole 40 is blocked between the cell body 32 and the portion of the tab assembly 33 that passes through the through-hole 40 to the side of the insulating film 41 facing the electrode body 21. The insulating bracket 42 is disposed on the side of the cell body 32 facing the first shell wall 111. A through-hole 40 is formed in the insulating bracket 42 at a position opposite the electrode component 2. The portion of the insulating bracket 42 surrounding the through-hole 40 is blocked between the adapter 35 and the cell body 32. The through-hole 40 on the insulating bracket 42 and the through-hole 40 on the insulating film 41 can be disposed opposite each other, and the insulating bracket 42 can cover at least a portion of the insulating film 41 on the end of the cell body 32 facing the first shell wall 111.

[0308] An insulating material member is disposed between the pole body 21 and the first shell wall 111 to achieve insulation between the first shell wall 111 and the pole body 21. For example, the insulating material member may be a portion of the pole component 2 (e.g., the insulating structure 23). In another example, the insulating material member may be disposed between the pole component 2 and the housing component 1.

[0309] Please refer to Figure 22-Figure 25 In some embodiments of the present application, the pole component 2 further includes a transition structure 22 and an insulating structure 23. The transition structure 22 surrounds the pole body 21 and is connected to the first shell wall 111. The insulating structure 23 is insulated and fitted between the transition structure 22 and the pole body 21.

[0310] The adapter structure 22 surrounds the entire circumference of the pole body 21 along the circumference of the mounting hole 112, thereby connecting the pole body 21 to the first shell wall 111 in the outer peripheral region of the pole body 21. The insulating structure 23 insulates the adapter structure 22 from the mating position of the pole body 21, preventing a short circuit between the pole body 21 and the adapter structure 22. The adapter structure 22 and the first shell wall 111 can be connected in any manner, such as welding, riveting, punching, bonding, etc.

[0311] In the above technical solution, the structure of the pole component 2 is simple and easy to process. Since it includes two parts, the pole body 21 and the adapter structure 22, the shape and size of the pole body 21 and the shape and size of the adapter structure 22 can be designed separately based on different factors to flexibly adapt to the connection requirements with different forms of shell components 1 and battery core components 3, thereby increasing the scope of application of the pole component 2.

[0312] Exemplarily, the adapter structure 22 can be set to match the shape of the mounting hole 112, and the shape of the mounting hole 112 can be designed to be a long strip that is convenient for the pole component 2 to pass through and makes the flipping angle of the pole component 2 smaller. At the same time, the pole body 21 can be designed to be a long strip that matches the shape of the adapter structure 22, so that the pole body 21 has a larger area to connect with the adapter 35. Alternatively, the pole body 21 can be designed to be a circle that does not match the shape of the adapter structure 22, which is conducive to reducing the connection area between the pole body 21 and the adapter structure 22, improving the force uniformity at the connection between the pole body 21 and the adapter structure 22, and thus improving the connection reliability between the pole body 21 and the adapter structure 22.

[0313] For example, the adapter structure 22 is formed into an elongated strip (e.g., a rectangle or a racetrack) extending along the length of the first shell wall 111, and the profile of the pole body 21 matches the profile of the adapter structure 22 (e.g., a rectangle or a racetrack). As previously described, the battery cell component 3 is connected to the pole component 2 via the conductive portion 36. When the profile of the pole body 21 is formed into an elongated strip that matches the profile of the adapter structure 22, the area of ​​the pole body 21 is larger, which helps to increase the connection area between the adapter 35 and the pole body 21, thereby improving the conductivity.

[0314] Exemplarily, when the pole component 2 includes the above-mentioned pole body 21, the adapter structure 22 and the insulating structure 23, during the assembly process of the battery cell 102, "connecting the battery cell component 3 with the pole component 2" can specifically include: connecting the battery cell component 3 with the pole body 21; setting the pole component 2 connected to the battery cell component 3 at the mounting hole 112, and connecting the adapter structure 22 with the first shell wall 111.

[0315] Please refer to Figure 22-Figure 25 In some embodiments of the present application, the insulating structure 23 is further sealed and fitted between the adapter structure 22 and the pole body 21. Thus, the insulating structure 23 not only insulates the adapter structure 22 from the pole body 21, but also seals the fitting position between the adapter structure 22 and the pole body 21. This allows the adapter structure 22 and the pole body 21 to be sealed, thereby isolating the inside and outside of the housing component 1 after the adapter structure 22 is connected to the first housing wall 111. This reduces the risk of electrolyte in the housing component 1 leaking from the fitting position between the adapter structure 22 and the pole body 21 to the outside of the housing component 1, and also reduces the risk of liquid or dust outside the housing component 1 entering the housing component 1 from the fitting position between the adapter structure 22 and the pole body 21, thereby improving the reliability of the battery cell 102.

[0316] In the above technical solution, since the insulating structure 23 is also sealed between the transition structure 22 and the pole body 21, when the pole component 2 is installed on the first shell wall 111 and the transition structure 22 and the first shell wall 111 are connected, no seal or the like is required between the transition structure 22 and the first shell wall 111, and no high sealing pressure is required to meet the compression level of the seal at that location. This can reduce the stress on the first shell wall 111, thereby protecting the shell component 1, thereby facilitating a reduction in the wall thickness of the shell component 1 and lowering material costs. Furthermore, since the first shell wall 111 is the end of the shell body 11 opposite the opening 113, the stress at the connection between the first shell wall 111 and the second shell wall 114 can be reduced, as well as the stress on the second shell wall 114, thereby facilitating the reliability of the shell body 11 and reducing the wall thickness and cost of the shell body 11.

[0317] Please refer again Figure 22-Figure 25 In some embodiments of the present application, the insulating structure 23 includes a sealing structure 231. In the embodiment of the present application, the sealing structure 231 is made of a material that has both sealing and insulating properties, such as an elastic rubber member.

[0318] Please refer again Figure 22-Figure 25 Exemplarily, at least a portion of the sealing structure 231 is clamped between the transition structure 22 and the pole body 21 in the inner and outer directions (eg, the fifth direction) of the first shell wall 111 .

[0319] In the embodiment of the present application, the direction from the inner side of the first casing wall 111 to the outer side of the first casing wall 111, and the direction from the outer side of the first casing wall 111 to the inner side of the first casing wall 111, are collectively referred to as the "inner-outer direction of the first casing wall 111 (e.g., the fifth direction)." The "inner side of the first casing wall 111" refers to the side of the first casing wall 111 facing the battery cell component 3, and the "outer side of the first casing wall 111" refers to the side of the first casing wall 111 facing away from the battery cell component 3.

[0320] The sealing structure 231 includes at least an axial side portion 231a, wherein the side of the axial side portion 231a facing the accommodating cavity 13 is the inner side of the axial side portion 231a, and the side of the axial side portion 231a facing away from the battery core component 3 is the outer side of the axial side portion 231a. One of the adapter structure 22 and the pole body 21 is partially clamped on the outer side of the axial side portion 231a, and the other part is clamped on the inner side of the axial side portion 231a, so that the axial side portion 231a is clamped between the adapter structure 22 and the pole body 21 in the inner and outer directions of the first shell wall 111 (for example, the fifth direction F5) to achieve axial sealing between the adapter structure 22 and the pole body 21.

[0321] Thus, by providing at least a portion of the sealing structure 231 to be clamped between the adapter structure 22 and the pole body 21 in the inward and outward directions of the first shell wall 111 (e.g., the fifth direction F5), an axial seal is achieved between the adapter structure 22 and the pole body 21. This axial seal provides a relatively reliable sealing effect, alleviating leakage issues that may occur at the mating location between the adapter structure 22 and the pole body 21. Furthermore, by integrating the axial seal (e.g., the axial side portion 231a) into the pole component, embodiments of the present application can reduce axial forces acting on the first shell wall 111.

[0322] Please refer again Figure 22-Figure 25 For example, the sealing structure 231 is arranged around the circumferential side of the adapter structure 22 facing the pole body 21 (i.e., the inner ring of the adapter structure 22). In the embodiment of the present application, since the adapter structure 22 is arranged around the pole body 21 and connected to the first shell wall 111, the circumferential side of the adapter structure 22 facing the pole body 21 is the "inner ring 2211 of the adapter structure 22", and the circumferential side of the adapter structure 22 facing the first shell wall 111 is the "outer ring 2212 of the adapter structure 22". In the above technical solution, by arranging the sealing structure 231 around the inner ring of the adapter structure 22, the sealing structure 231 can be close to the matching position of the adapter structure 22 and the pole body 21, which is conducive to sealing the matching position of the adapter structure 22 and the pole body 21 in a shorter path, improving the reliability of the seal, and also helping to reduce the size of the sealing structure 231, reducing the sealing area, facilitating compression sealing, and preventing the seal from failing, thereby improving the sealing effect.

[0323] In addition, when the insulating structure 23 includes a sealing structure 231, the sealing structure 231 is clamped between the transition structure 22 and the pole body 21 so that the transition structure 22 and the pole body 21 are sealed together, and the transition structure 22 is formed into a long strip extending along the length direction of the first shell wall 111, and the pole body 21 is arranged at the length center position of the transition structure 22 and is circular, since the connection position of the transition structure 22 and the pole body 21 is subjected to uniform force, it is easy to control the compression amount of the sealing structure 231 to improve the reliability of the sealing cooperation between the transition structure 22 and the pole body 21, and the sealing area is relatively small and not easy to fail.

[0324] Please refer again Figure 22-Figure 25 In some embodiments of the present application, the pole body 21 includes a peripheral portion 212, and the transition structure 22 is clamped on both sides of the peripheral portion 212 in the inner and outer directions of the first shell wall 111 through the insulating structure 23, and at least a portion of the sealing structure 231 is clamped between the side of the peripheral portion 212 facing the battery core component 3 and the transition structure 22.

[0325] In this embodiment, the peripheral portion 212 can be the outer peripheral structure of the pole body 21. Since the sealing structure 231 is arranged around the peripheral side of the transition structure 22 facing the pole body 21, the sealing structure 231 can be clamped between the peripheral portion 212 and the transition structure 22.

[0326] In this embodiment, the side of the peripheral portion 212 facing away from the battery cell component 3 is the outer side of the peripheral portion 212, and the side of the peripheral portion 212 facing the accommodating cavity 13 is the inner side of the peripheral portion 212. The adapter structure 22 is limited to the outer side of the peripheral portion 212 by the insulating structure 23 to limit the movement of the pole body 21 relative to the adapter structure 22 in the direction away from the battery cell component 3. The adapter structure 22 is also limited to the inner side of the peripheral portion 212 by the insulating structure 23 to limit the movement of the pole body 21 relative to the adapter structure 22 toward the accommodating cavity 13, thereby realizing that the adapter structure 22 is clamped on both sides of the peripheral portion 212 in the inner and outer directions of the first shell wall 111 (for example, the fifth direction F5) through the insulating structure 23.

[0327] In the above technical solution, the structure of the pole component 2 is simple and easy to process, which can simply and effectively achieve the relative fixation and insulation matching between the pole body 21 and the adapter structure 22. The peripheral portion 212 of the pole body 21 and the adapter structure 22 are used to clamp the sealing structure 231, so that the sealing structure 231 can be located at the matching position of the adapter structure 22 and the pole body 21. This facilitates sealing the matching position of the adapter structure 22 and the pole body 21 in a shorter path, improving the reliability of the seal. It also helps to reduce the size of the sealing structure 231, reduce the sealing area, and easily achieve compression sealing. The seal is less likely to fail, thereby improving the sealing effect. Moreover, because at least a portion of the sealing structure 231 is clamped between the side of the peripheral portion 212 facing the battery cell component 3 and the adapter structure 22, the sealing structure 231 can seal from the side of the peripheral portion 212 facing the accommodating cavity 13, which can more effectively prevent electrolyte leakage from the matching position between the pole body 21 and the adapter structure 22, thereby improving the sealing effect.

[0328] Please refer again Figure 25 Exemplarily, the insulating structure 23 further includes a first insulating member 232. The transition structure 22 is clamped on both sides of the peripheral portion 212 along the inner-outer direction (e.g., the fifth direction F5) of the first shell wall 111 by the first insulating member 232 and the sealing structure 231. In this embodiment, the transition structure 22 is not limited in composition and can be a single component or a combination of multiple components (e.g., two or more).

[0329] Since at least a portion of the sealing structure 231 (such as the axial side portion 231a) is arranged on the side of the peripheral portion 212 facing the battery core component 3, at least a portion of the first insulating member 232 is arranged on the side of the peripheral portion 212 facing away from the battery core component 3, and the transition structure 22 can be clamped on both sides of the peripheral portion 212 along the inner and outer directions of the first shell wall 111 (for example, the fifth direction F5) through the first insulating member 232 and the sealing structure 231 respectively.

[0330] In the above technical solution, since the insulating structure 23 includes a first insulating member 232 and a sealing structure 231 that are not integrated into a single piece, the design and processing of the insulating structure 23 can be simplified. Moreover, depending on the specific requirements for coordination with the pole body 21 and the adapter structure 22, the first insulating member 232 can be configured as a substantially incompressible insulating member that does not provide a sealing effect (e.g., a plastic member), or as a compressible sealing member that provides a sealing effect (e.g., an elastic rubber member), thereby meeting different practical requirements. In addition, when the first insulating member 232 is a substantially incompressible insulating member that does not provide a sealing effect (e.g., a plastic member), the compression of the sealing structure 231 can be easily controlled, thereby improving the sealing effect.

[0331] Alternatively, in other embodiments of the present application, the sealing structure 231 can be an integral structural member and externally enclose the peripheral portion 212, so as to be located on the side of the peripheral portion 212 facing the cell component 3 and the side facing away from the cell component 3, respectively. The adapter structure 22 can be clamped on both sides of the peripheral portion 212 along the inner-outer direction (e.g., the fifth direction F5) of the first housing wall 111 by the sealing structure 231. In other words, the sealing structure 231 is a single, annular structural member that provides both insulation and sealing properties. The sealing structure 231 includes axial side portions 231a located on both inner and outer sides of the peripheral portion 212. Thus, the adapter structure 22 can be clamped on both sides of the peripheral portion 212 along the inner-outer direction (e.g., the fifth direction F5) of the first housing wall 111 by the two axial side portions 231a of the sealing structure 231. In this technical solution, because the sealing structure 231 is an integral structural member and externally encloses the peripheral portion 212, the number of components and assembly steps can be reduced.

[0332] Please refer again Figure 22-Figure 25 In some embodiments of the present application, the adapter structure 22 includes a first adapter ring 221 and a second adapter ring 222. The second adapter ring 222 is arranged on the side of the first adapter ring 221 away from the battery core component 3. The second adapter ring 222 is connected to the first adapter ring 221, and the first adapter ring 221 is connected to the first shell wall 111. The sealing structure 231 is clamped between the first adapter ring 221 and the peripheral portion 212. The second adapter ring 222 is insulated and fixedly matched with the peripheral portion 212 by the first insulating member 232.

[0333] For example, the first adapter ring 221 and the second adapter ring 222 can be connected by welding, riveting, punching, or bonding. For example, the outer ring of one of the first adapter ring 221 and the second adapter ring 222 is welded, riveted, punched, or bonded to the first shell wall 111. For example, the first adapter ring 221 and the second adapter ring 222 are both made of aluminum and welded together, and the first adapter ring 221 and the first shell wall 111 are both made of aluminum and welded together, which helps improve the welding yield.

[0334] Therefore, the adapter structure 22 includes a first adapter ring 221 and a second adapter ring 222 that are arranged inside and outside and assembled and connected, thereby facilitating the assembly connection of the adapter structure 22 with the insulating structure 23 and the pole body 21, making the pole component 2 easy to process and manufacture, and easy to control the compression amount of the sealing structure 231, thereby improving the sealing reliability.

[0335] The second adapter ring 222 is insulated and fixedly matched with the peripheral portion 212 by the first insulating member 232 in any manner. Figure 22-Figure 25 The first insulating member 232 and the second adapter ring 222 can be connected by injection molding. Figure 26 , Figure 26 A cross-sectional view of a pole component provided for some embodiments of the present application; the second adapter ring 222 may include a stop ring portion 2221, and at least a portion of the first insulating member 232 is clamped between the stop ring portion 2221 and the peripheral portion 212 along the inner and outer directions of the first shell wall 111 (for example, the fifth direction F5), wherein the material of the first insulating member 232 is not limited, for example, it can be a plastic member or an elastic rubber member.

[0336] Please refer again Figure 25 Exemplarily, the adapter structure 22 further includes a first insulating frame 224, which is connected to the side of the first adapter ring 221 facing the battery cell component 3. Thus, the first insulating frame 224 can be used to insulate between the battery cell component 3 and the first adapter ring 221, reducing the difficulty of providing an insulating structure. Exemplarily, the first insulating frame 224 has a pin, and the first adapter ring 221 has a socket. The pin is inserted into the socket through an interference fit to achieve the connection between the first insulating frame 224 and the first adapter ring 221.

[0337] Please refer to Figure 27 , Figure 27 A cross-sectional view of a pole component provided in some embodiments of the present application; in some embodiments of the present application, the adapter structure 22 includes a third adapter ring 223, which includes an integrally provided inner extension portion 2231 and an outer extension portion 2232. In other words, the inner extension portion 2231 and the outer extension portion 2232 are different parts of a single piece, rather than two separate parts assembled and connected.

[0338] The end of the inner extension 2231 facing the pole body 21 (i.e., the inner ring of the inner extension 2231) and the end of the outer extension 2232 facing the pole body 21 (i.e., the inner ring of the outer extension 2232) are spaced apart in the inner-outer direction, so as to be clamped on either side of the peripheral portion 212 along the inner-outer direction (e.g., the fifth direction F5) of the first housing wall 111 by the insulating structure 23. The sealing structure 231 is clamped between the inner extension 2231 and the peripheral portion 212, and the outer extension 2232 is insulated and fixedly engaged with the peripheral portion 212 by the first insulating member 232.

[0339] The third adapter ring 223 and the first shell wall 111 may be connected in any manner, such as welding, riveting, punching, bonding, etc. For example, the third adapter ring 223 and the first shell wall 111 are both made of aluminum and welded together, thereby improving welding yield.

[0340] The outer extension portion 2232 is insulated and fixedly matched with the peripheral portion 212 by the first insulating member 232. For example, please refer to Figure 27 The outer extension portion 2232 rivets the first insulating member 232 against the peripheral portion 212. For another example, please refer to Figure 28 , Figure 28 This is a cross-sectional view of a pole component provided in some embodiments of the present application; the first insulating member 232 and the pole body 21, as well as the first insulating member 232 and the outer extension portion 2232 are respectively injection-molded, and the inner extension portion 2231 rivets the sealing structure 231 against the peripheral portion 212.

[0341] For example, please refer again to Figure 28 The adapter structure 22 also includes a second insulating frame 225, which is connected to the side of the third adapter ring 223 facing the battery cell component 3. This allows the second insulating frame 225 to insulate the battery cell component 3 from the third adapter ring 223, eliminating the need for an insulating structure. For example, the second insulating frame 225 has a latch, and the third adapter ring 223 has a socket. The latch is inserted into the socket through an interference fit to achieve the connection between the second insulating frame 225 and the third adapter ring 223.

[0342] Please refer to Figure 29-30 In some embodiments of the present application, the transition structure 22 includes a mating ring portion 2271, the pole body 21 includes a penetration portion 214 penetrated through the mating ring portion 2271, and an inner limiting portion 215 and an outer limiting portion 216 connected to the penetration portion 214 and clamped on the inner and outer sides of the mating ring portion 2271, and at least a portion of the sealing structure 231 is clamped between the mating ring portion 2271 and the inner limiting portion 215.

[0343] Illustratively, the adapter structure 22 includes a fourth adapter ring 227, which includes a mating ring portion 2271. The fourth adapter ring 227 is connected to the first housing wall 111, for example, the outer ring of the fourth adapter ring 227 is connected to the first housing wall 111. The fourth adapter ring 227 and the first housing wall 111 can be connected in any manner, such as welding, riveting, punching, or bonding. Illustratively, the fourth adapter ring 227 and the first housing wall 111 are both made of aluminum and welded together, thereby improving welding yield.

[0344] In the above technical solution, the structure of the pole component 2 is simple and easy to process, and can simply and effectively achieve the relative fixation and insulation matching of the pole body 21 and the adapter structure 22. The sealing structure 231 is clamped by the matching position of the pole body 21 and the matching ring portion 2271, so that the sealing structure 231 can be in the matching position of the adapter structure 22 and the pole body 21, which is conducive to sealing the matching position of the adapter structure 22 and the pole body 21 in a shorter path, improving the reliability of the seal, and also helping to reduce the size of the sealing structure 231, reducing the sealing area, and easily achieving compression sealing on it, making the seal less likely to fail, thereby improving the sealing effect. Moreover, because at least a portion of the sealing structure 231 is clamped between the matching ring portion 2271 and the inner limit portion 215, the sealing structure 231 can be sealed from the side of the matching ring portion 2271 facing the accommodating cavity 13, which can more effectively inhibit the leakage of electrolyte from the matching position of the pole body 21 and the adapter structure 22, thereby improving the sealing effect.

[0345] Please refer again Figure 29 The insulating structure 23 may further include a second insulating member 234 , wherein at least a portion of the sealing structure member 231 is clamped between the inner limiting portion 215 and the mating ring portion 2271 , and at least a portion of the second insulating member 234 is clamped between the outer limiting portion 216 and the mating ring portion 2271 .

[0346] In the above technical solution, since the insulating structure 23 includes a second insulating member 234 and a sealing structure 231 that are not integrated into a single piece, the design and processing of the insulating structure 23 can be simplified. Furthermore, depending on the specific requirements for coordination with the pole body 21 and the transition structure 22, the second insulating member 234 can be configured as a substantially incompressible insulating member that does not provide a sealing effect (e.g., a plastic member), or as a compressible sealing member that provides a sealing effect (e.g., an elastic rubber member), thereby meeting different practical requirements. Furthermore, when the second insulating member 234 is a substantially incompressible insulating member that does not provide a sealing effect (e.g., a plastic member), the compression of the sealing structure 231 can be easily controlled, thereby improving the sealing effect.

[0347] Alternatively, please combine Figure 30In some other embodiments of the present application, the sealing structure 231 can also be a unitary structure and include a mating ring portion 2271, positioned on the side of the mating ring portion 2271 facing the cell component 3 and the side facing away from the cell component 3. The terminal body 21 is clamped on both sides of the mating ring portion 2271 along the inward-outward direction (e.g., the fifth direction F5) of the first housing wall 111 by the sealing structure 231. In other words, the sealing structure 231 is a unitary annular structure that provides both insulation and sealing properties. The sealing structure 231 includes axial side portions 231a located on both sides of the mating ring portion 2271. Thus, the adapter structure 22 can be clamped on both sides of the mating ring portion 2271 along the inward-outward direction (e.g., the fifth direction F5) of the first housing wall 111 by the two axial side portions 231a of the sealing structure 231. In this technical solution, because the sealing structure 231 is a unitary structure and includes the mating ring portion 2271, the number of components and assembly steps can be reduced.

[0348] In an embodiment of the present application, when the pole body 21 includes a penetration portion 214, and an inner limiting portion 215 and an outer limiting portion 216 connected to the penetration portion 214 and clamped on both sides of the mating ring portion 2271, the composition of the pole body 21 is not limited, and it can be a single part or a combination of multiple parts (such as two or more).

[0349] For example, please refer again to Figure 29 , the outer limiting portion 216 and the penetration portion 214 are assembled and connected on the side of the matching ring portion 2271 away from the inner limiting portion 215. There is no limit to the way the outer limiting portion 216 and the penetration portion 214 are assembled and connected, such as welding, punching, adhesive connection, etc., and the assembly connection refers to the two parts being connected together through a connection process. Thus, the outer limiting portion 216 and the penetration portion 214 are set as separate parts and assembled and connected, and the structure of the pole body 21 is simple and easy to assemble and connect with the adapter structure 22. In addition, when the outer limiting portion 216 and the penetration portion 214 are welded, the thermal impact on the sealing structure 231 clamped between the inner limiting portion 215 and the matching ring portion 2271 can be reduced, thereby improving the sealing reliability of the sealing structure 231.

[0350] In the above embodiment, the connection method of the penetration portion 214 and the inner limiting portion 215 is not limited, and can be a one-piece piece, or can be a split piece and pre-connected together. For example, the end of the penetration portion 214 facing away from the inner limiting portion 215 can include a riveted portion 2141. During assembly, the penetration portion 214 can be penetrated along the direction from the inner limiting portion 215 to the outer limiting portion 216 through the matching ring portion 2271 with the insulating structure 23, and then the riveted portion 2141 is riveted to limit the penetration portion 214 from being dislodged along the direction from the outer limiting portion 216 to the inner limiting portion 215. After that, the riveted portion 2141 can be connected to the outer limiting portion 216, thereby facilitating the connection between the penetration portion 214 and the outer limiting portion 216, such as welding. Alternatively, the riveted portion 2141 can be omitted, thereby eliminating the riveting process after the penetration portion 214 is penetrated.

[0351] For example, please combine again Figure 30 In some other embodiments of the present application, the outer limiting portion 216 and the penetration portion 214 are integrally formed, and the outer limiting portion 216 rivets the second insulating member 234 against the mating ring portion 2271. In the above technical solution, the assembly connection between the outer limiting portion 216 and the insulating structure 23 and the transition structure 22 is achieved by riveting, which reduces the thermal impact of the heat generated when the outer limiting portion 216 is connected to the insulating structure 23 and the transition structure 22 on the sealing structure 231, thereby improving the sealing reliability of the sealing structure 231. In addition, by riveting the outer limiting portion 216 to press the second insulating member 234 against the mating ring portion 2271, it is easy to control the compression amount of the sealing structure 231, thereby achieving a better compression effect.

[0352] In the above embodiment, the connection method between the penetration portion 214 and the inner limiting portion 215 is not limited. They can be a single piece, or they can be separate pieces that are pre-connected. For example, during assembly, the penetration portion 214 can be passed through the mating ring portion 2271 equipped with the insulating structure 23 along the direction from the inner limiting portion 215 to the outer limiting portion 216. The outer limiting portion 216 is then riveted to restrict the relative movement between the pole body 21 and the adapter structure 22.

[0353] The pole body 21 is a solid structure or a hollow structure. For example, when the pole body 21 is a hollow structure, please refer to Figure 29The pole body 21 includes a first pole member 21a and a second pole member 21b. The second pole member 21b is composed of a penetration portion 214, an inner limiting portion 215, and an outer limiting portion 216, and is mounted on the first shell wall 111. The penetration portion 214 surrounds a mating hole 21b1 that penetrates in the inward and outward directions of the first shell wall 111. The first pole member 21a is assembled on the side of the second pole member 21b facing away from the battery cell component 3 and covers the mating hole 21b1, thereby forming a storage space open toward the battery cell component 3 between the first pole member 21a and the second pole member 21b. The conductive portion 36 can partially extend into the storage space and connect to the first pole member 21a. As a result, the pole body 21 can accommodate the conductive portion 36, thereby reducing the space occupied by the conductive portion 36 in the storage cavity 13, which is beneficial for improving the energy density of the battery cell 102.

[0354] Please refer again Figure 29 In some embodiments of the present application, the adapter structure 22 further includes a third insulating frame 228, which is connected to the side of the fourth adapter ring 227 facing the battery cell component 3. Thus, the third insulating frame 228 can be used to insulate between the battery cell component 3 and the fourth adapter ring 227, eliminating the need for an insulating structure. For example, the third insulating frame 228 has a pin, and the fourth adapter ring 227 has a socket. The pin is inserted into the socket through an interference fit to achieve the connection between the third insulating frame 228 and the fourth adapter ring 227.

[0355] Please refer to Figure 31 In some embodiments of the present application, the first housing wall 111 has a mounting hole 112, and a sealing ring 14 is disposed around the mounting hole 112. The sealing ring 14 is clamped between the pole component 2 and the first housing wall 111. As a result, the pole component 2 has a simple structure, is easy to process, and is easy to assemble and connect with the first housing wall 111.

[0356] In some embodiments of the present application, a mounting hole 112 is provided on the first shell wall 111, the pole component 2 covers the mounting hole 112, and the edge of the adapter structure 22 overlaps one side of the first shell wall 111 in the wall thickness direction. In this way, by covering the adapter structure 22 on one side of the first shell wall 111 in the wall thickness direction, that is, the adapter structure 22 is covered on the outside of the first shell wall 111, or covered on the inside of the first shell wall 111, the assembly of the adapter structure 22 and the first shell wall 111 is facilitated.

[0357] Exemplarily, the adapter structure 22 is welded to the first shell wall 111. For example, after the adapter structure 22 is placed on the first shell wall 111, the adapter structure 22 and the first shell wall 111 can be connected by welding, thereby facilitating processing and effectively ensuring the reliability of the connection between the adapter structure 22 and the first shell wall 111. For example, welding can be performed from the outside of the first shell wall 111 so that the weld formed by the connection is exposed on the side of the first shell wall 111 facing away from the battery cell component 3 (i.e., the side facing away from the battery cell body 32), thereby facilitating the welding operation and increasing the welding space. The present application is not limited to this. For example, in other embodiments of the present application, the adapter structure 22 can also be configured to penetrate the mounting hole 112 and be riveted to the first shell wall 111.

[0358] Please refer to Figure 32 and Figure 33 , Figure 32 The middle pole component 2 is in a state of being covered before the first shell wall 111; Figure 33 for Figure 32 FIG. 1 is a diagram showing a state in which the pole component 2 is covered with the first shell wall 111 .

[0359] Please refer to Figure 32 and Figure 33 In some embodiments, when the battery cell component 3 is first connected to the pole component 2 and then the pole component 2 is assembled and connected to the first shell wall 111, after the battery cell component 3 is connected to the pole component 2 (for example, the pole component 2 and the battery cell component 3 can be connected first, then installed into the shell body 11 together, and then the pole component 2 is extended from the mounting hole 112 to the outside of the first shell wall 111; or for another example, the battery cell component 3 is installed into the shell body 11, the conductive part 36 is passed through the mounting hole 112, and connected to the pole component 2 pre-arranged on the outside of the first shell wall 111), the pole component 2 is covered on the mounting hole 112 of the first shell wall 111 from the outside of the first shell wall 111 (that is, the side away from the battery cell body 32). At this time, the edge of the transition structure 22 overlaps the side of the first shell wall 111 away from the battery cell component 3. Therefore, since the pole component 2 covers the first shell wall 111 from the outside, the pole component 2 and the first shell wall 111 are easily assembled and connected, which is beneficial to improving the connection reliability between the pole component 2 and the first shell wall 111.

[0360] Please refer to Figure 32 and Figure 33In some embodiments of the present application, when the edge of the adapter structure 22 overlaps the side of the first shell wall 111 facing away from the battery cell component 3, a first recessed groove 1111 surrounding the mounting hole 112 may be provided on the first shell wall 111. The first recessed groove 1111 is open in a direction away from the battery cell component 3 (i.e., the first recessed groove 1111 is open in a direction away from the battery cell body 32). The edge of the adapter structure 22 is embedded in the first recessed groove 1111. The edge of the adapter structure 22 has a flange portion 22a surrounding the adapter structure 22, and the flange portion 22a is embedded in the first recessed groove 1111. This facilitates supporting and positioning the connection between the adapter structure 22 and the first shell wall 111, facilitating welding the two from the outside of the first shell wall 111 (i.e., the side facing away from the battery cell body 32).

[0361] Please refer again Figure 32 and Figure 33 For example, the thickness of the flange portion 22a matches the groove depth T1 of the first groove 1111, where "matching" means that the thickness of the flange portion 22a is substantially consistent with the groove depth of the first groove 1111. This facilitates welding of the flange portion 22a to the first shell wall 111. The thickness of the flange portion 22a is not too large relative to the groove depth of the first groove 1111, thereby reducing unnecessary space occupation. The thickness of the flange portion 22a is also not too small relative to the groove depth of the first groove 1111, thereby meeting the required welding strength.

[0362] Combine Figure 32-Figure 34 In some embodiments of the present application, the mounting hole 112 is an elongated hole (e.g., a rectangle, an ellipse, or a racetrack), and the pole component 2 is formed into an elongated structure (e.g., a rectangle, an ellipse, or a racetrack) that matches the shape of the mounting hole 112. When the battery cell component 3 is first connected to the pole component 2, and then the pole component 2 and the battery cell component 3 are installed into the shell body 11, and then the pole component 2 is extended from the mounting hole 112 to the outside of the first shell wall 111, and then the pole component 2 is turned over from the outside of the first shell wall 111 to cover the pole component 2 at the mounting hole 112, and then the pole component 2 is connected to the first shell wall 111, if the pole component 2 is set to a long strip structure that matches the shape of the mounting hole 112, the pole component 2 can be adjusted to a thickness direction that is aligned with the width direction of the mounting hole 112 (e.g., Figure 33 After the pole component 2 passes through the mounting hole 112, the thickness direction of the pole component 2 is rotated to the thickness direction of the first shell wall 111 (for example, Figure 33In the embodiment of the present invention, the first direction F1 shown in FIG1 is close to the first direction F1 shown in FIG2 , so that the space required for the flipping movement of the pole component 2 is small, which can reduce the space required for the flipping of the pole component 2, thereby shortening the length of the conductive portion 36, saving materials, and reducing costs. In addition, the redundancy of the conductive portion 36 can be reduced, and the space occupied by the conductive portion 36 in the accommodating cavity 13 is reduced, which is beneficial to improving the energy density of the battery cell 102.

[0363] Please refer to Figure 34 and Figure 35 In some embodiments, when the battery cell component 3 and the pole component 2 are first connected and then the pole component 2 is assembled and connected to the first shell wall 111, the battery cell component 3 and the pole component 2 can be installed together into the shell body 11 after the battery cell component 3 and the pole component 2 are connected. In this way, the pole component 2 can be covered in the installation hole 112 of the first shell wall 111 from the inner side of the first shell wall 111 (i.e., the side facing the battery cell body 32). At this time, the edge of the transition structure 22 overlaps the side of the first shell wall 111 facing the battery cell component 3. Therefore, because the pole component 2 is installed in the installation hole 112 from the inner side of the first shell wall 111, the battery cell component 3 and the pole component 2 can be installed together into the shell body 11, and the pole component 2 does not need to pass through the installation hole 112, thereby reducing the number of operation steps and reducing the difficulty of operation.

[0364] Please refer to Figure 34 and Figure 35 In some embodiments of the present application, when the edge of the adapter structure 22 overlaps the side of the first shell wall 111 facing the battery cell component 3, the edge of the adapter structure 22 has a second recessed groove 22b that opens away from the battery cell component 3 (i.e., the second recessed groove 22b opens away from the battery cell body 32). The first shell wall 111 includes an overlapping portion 1112 that protrudes into the mounting hole 112 and is embedded in the second recessed groove 22b. This facilitates supporting and positioning the connection between the pole component 2 and the first shell wall 111, facilitating welding from the outside of the first shell wall 111 (i.e., the side facing away from the battery cell body 32).

[0365] Please refer again Figure 34 and Figure 35 For example, the thickness of the overlapping portion 1112 matches the groove depth T2 of the second sunken groove 22b, where "matching" means that the thickness of the overlapping portion 1112 is substantially consistent with the groove depth of the second sunken groove 22b. This facilitates welding of the overlapping portion 1112 to the first shell wall 111. The thickness of the overlapping portion 1112 is not too large relative to the groove depth of the second sunken groove 22b, thereby reducing unnecessary space occupation. The thickness of the overlapping portion 1112 is also not too small relative to the groove depth of the second sunken groove 22b, thereby meeting the required welding strength.

[0366] In some embodiments of this application, please refer to Figure 7 The pole component 2 defines a receiving groove 5 that is recessed relative to the first shell wall 111 in a direction away from the battery cell component 3 and open toward the battery cell component 3. At least a portion of the adapter 35 is accommodated in the pole body of the receiving groove 5. In other words, the pole component 2 defines a receiving groove 5, the groove wall of which is formed by the pole component 2. The receiving groove 5 is recessed in a direction away from the battery cell body 32 and open toward the battery cell body 32, thereby connecting the receiving groove 5 to the receiving cavity 13.

[0367] Thus, by providing the receiving groove 5 to accommodate the adapter 35, the space occupied by the adapter 35 in the receiving chamber 13 can be reduced, leaving the receiving chamber 13 with more space to accommodate the battery cell body 32, thereby increasing the volume of the battery cell body 32 and thus the energy density of the battery cell 102. Furthermore, because the receiving groove 5 is open toward the battery cell component 3, the adapter 35 can be easily inserted into the receiving groove 5, reducing the difficulty of operation.

[0368] For example, please refer again to Figure 7 The accommodating groove 5 is formed on the side of the pole body 21 and the adapter structure 22 facing the battery core component 3 (i.e., the side facing the battery core body 32), and the adapter structure 22 is raised relative to the first shell wall 111 in the direction away from the battery core component 3 (i.e., away from the battery core body 32), so that the accommodating groove 5 is recessed relative to the first shell wall 111 in the direction away from the battery core component 3.

[0369] Therefore, by processing the adapter structure 22 into an outwardly protruding bulge, a part of the accommodating groove 5 is formed on the side of the pole body 21 facing the battery core component 3, and another part of the accommodating groove 5 is formed on the side of the adapter structure 22 facing the battery core component 3, and the accommodating groove 5 is in a shape that is concave relative to the first shell wall 111 in the direction away from the battery core component 3, so that the side of the pole body 21 facing the battery core component 3 and the side of the adapter structure 22 facing the battery core component 3 both have a space accommodating groove conductive part 36. In this way, it is not only convenient to accommodate the conductive part 36 to a greater extent, but also conducive to the design of diverse forms of the conductive part 36.

[0370] In other embodiments of the present application, Figure 28 When the adapter structure 22 does not bulge in the direction away from the battery core component 3 (i.e., away from the battery core body 32) relative to the first shell wall 111, the height difference between the adapter structure 22 and the pole body 21 can also define a receiving groove 5 that is recessed in the direction away from the battery core component 3 relative to the first shell wall 111.

[0371] In some embodiments of this application, please refer to Figure 7, the surface of the end of the pole body 21 facing the battery cell component 3 is the inner end face 211 of the pole body 21, the inner end face 211 of the pole body 21 participates in forming the accommodating groove 5, and the conductive portion 36 is connected to the inner end face 211 of the pole body 21. That is, at least a portion of the inner end face 211 of the pole body 21 participates in defining the groove wall of the accommodating groove 5, and the conductive portion 36 is connected to the portion of the inner end face 211 of the pole body 21 that serves as the groove wall of the accommodating groove 5. In the above technical solution, at least a portion of the accommodating groove 5 is surrounded by the surface of the side of the pole body 21 facing the battery cell component 3, and the conductive portion 36 housed in the accommodating groove 5 can be easily contacted and connected to the pole body 21, thereby improving the connection convenience and simplifying the structure.

[0372] For example, when at least a portion of the conductive portion 36 is accommodated in the accommodating groove 5, the pole connecting portion (e.g., the pole lug portion 332 described herein, or the first conductive segment 415 of the adapter 35) of the conductive portion 36 (e.g., the tab assembly 33 or the adapter 35) can be laid on the inner end surface 211 of the pole body 21 and connected to the inner end surface 211 of the pole body 21. During processing, the pole connecting portion of the conductive portion 36 can first be installed in the accommodating groove 5, and then laid on the inner end surface 211 of the pole body 21 and connected to the inner end surface 211 of the pole body 21.

[0373] Exemplarily, the conductive portion 36 may include a pole connecting portion, which may be in the shape of a relatively rigid plate, such as one that will not bend downward under the action of gravity, such as the pole ear portion 332 described herein (such as an ultrasonic weld mark), or the first conductive segment 415 of the adapter 35 (such as a metal sheet).

[0374] For example, referring to Figure 7 Regardless of whether the transition structure 22 protrudes relative to the first shell wall 111 in a direction away from the battery cell component 3, the portion of the inner end surface 220 of the transition structure 22 adjacent to the terminal body 21 is a surrounding region 2201 surrounding the terminal body 21. The surrounding region 2201 is flush with the inner end surface 211 of the terminal body 21. The inner end surface 220 of the transition structure 22 can be planar or non-planar, such as a protruding shape. The portion of the inner end surface 220 of the transition structure 22 that faces the terminal body 21 is the surrounding region 2201.

[0375] Exemplarily, when the inner end surface 211 of the pole body 21 is set to be larger (for example, the transition structure 22 is formed into a long strip extending along the length direction of the first shell wall 111, and the contour shape of the pole body 21 matches the contour shape of the transition structure 22), and when the surrounding area 2201 is flush with the inner end surface 211 of the pole body 21, the pole connecting portion of the conductive portion 36 can be completely laid flat on the inner end surface 211 of the pole body 21.

[0376] For example, in combination Figure 26 When the inner end surface 211 of the pole body 21 is relatively small (for example, the adapter structure 22 is configured to be an elongated strip extending along the length direction of the first shell wall 111, and the pole body 21 is located in the center of the adapter structure 22 and has a circular outline), and when the surrounding area 2201 is flush with the inner end surface 211 of the pole body 21, a portion of the pole connecting portion of the conductive portion 36 can be laid flat on the inner end surface 211 of the pole body 21, and the remaining portion can be laid flat on the surrounding area 2201, so that the pole connecting portion of the conductive portion 36 (for example, when the pole connecting portion is also elongated) can be supported as a whole, which facilitates the tightening of the welding nozzle, so that the conductive portion 36 can be reliably connected to the pole body 21.

[0377] Exemplarily, the conductive portion 36 may include a pole connecting portion, which may be in the shape of a relatively rigid plate, such as one that will not bend downward under the action of gravity, such as the pole ear portion 332 described herein (such as an ultrasonic weld mark), or the first conductive segment 415 of the adapter 35 (such as a metal sheet).

[0378] For example, referring to Figure 27 Regardless of whether the adapter structure 22 bulges relative to the first shell wall 111 in a direction away from the battery cell component 3, the portion of the inner end surface 220 of the adapter structure 22 adjacent to the terminal body 21 is located within a surrounding region 2201 surrounding the terminal body 21. The inner end surface 211 of the terminal body 21 protrudes beyond the surrounding region 2201 toward the battery cell component 3. The inner end surface 220 of the adapter structure 22 can be planar or non-planar, such as a bulge. The portion of the inner end surface 220 of the adapter structure 22 that faces the terminal body 21 is the surrounding region 2201.

[0379] Thus, by setting the inner end surface 211 of the pole body 21 to protrude from the surrounding area 2201 toward the direction of the battery core component 3, when the height of the pole body 21 is constant, the pole body 21 can be retracted in the direction of the accommodating cavity 13, thereby reducing the space occupied by the pole component 2 outside the shell component 1, and reducing the battery cell 102 in the direction of setting the pole component 2 (for example Figure 3 The dimensions in the first direction F1) are shown in FIG.

[0380] Exemplarily, when the inner end face 211 of the pole body 21 is set to be larger (for example, the adapter structure 22 is formed into a long strip extending along the length direction of the first shell wall 111, and the contour shape of the pole body 21 matches the contour shape of the adapter structure 22), and when the inner end face 211 of the pole body 21 protrudes from the surrounding area 2201 toward the direction of the battery core component 3, the pole connection part of the conductive part 36 can be completely laid flat on the inner end face 211 of the pole body 21.

[0381] For example, in combination Figure 27 When the inner end surface 211 of the pole body 21 is relatively small (for example, the adapter structure 22 is configured to be an elongated strip extending along the length direction of the first shell wall 111, and the pole body 21 is located in the center of the adapter structure 22 and has a circular outline), and when the inner end surface 211 of the pole body 21 protrudes beyond the surrounding area 2201 toward the battery cell component 3, the conductive portion 36 can be configured to include a tab group 33 and an adapter 35 connected to the tab group 33. The adapter 35 includes a first conductive segment 415 laid on the inner end surface 211 of the pole body 21, and a second conductive segment 416 offset from the inner end surface 211 of the pole body 21. The second conductive segment 416 protrudes relative to the first conductive segment 415 in a direction away from the battery cell component 3 (i.e., toward the outside, or in a direction away from the battery cell body 32). The tab group 33 is connected to the second conductive segment 416. Thus, the height difference between the inner end surface 211 of the electrode body 21 and the surrounding area 2201 can be used to accommodate the second conductive segment 416 of the adapter 35 and the tab assembly 33, thereby making full use of the space, reducing the space occupied by the conductive portion 36 in the accommodating cavity 13, and improving the energy density of the battery cell 102. For example, if the portion where the tab assembly 33 connects to the second conductive segment 416 is in the shape of an elongated strip, the second conductive segment 416 can also be configured as an elongated strip, while the first conductive segment 415 can be configured as a circular shape that matches the shape of the electrode body 21 to meet the connection requirements. In addition, when the adapter 35 includes the first conductive segment 415 and the second conductive segment 416, in order to ensure that the second conductive segment 416 protrudes relative to the first conductive segment 415 in a direction away from the battery cell component 3, the adapter 35 can be processed from a material with a certain hardness and thickness, for example, the adapter 35 can be a metal sheet.

[0382] For example, referring to Figure 28 Regardless of whether the transition structure 22 protrudes relative to the first shell wall 111 in a direction away from the battery cell component 3, the portion of the inner end surface 220 of the transition structure 22 adjacent to the pole body 21 is located within a surrounding region 2201 surrounding the pole body 21. The surrounding region 2201 protrudes from the inner end surface 211 of the pole body 21 toward the battery cell component 3. The inner end surface 220 of the transition structure 22 can be planar or non-planar, such as a protruding shape. The portion of the inner end surface 220 of the transition structure 22 that faces the pole body 21 is the surrounding region 2201.

[0383] For example, referring to Figure 30When the inner end surface 211 of the pole body 21 is set to be larger (for example, the adapter structure 22 is formed into a long strip extending along the length direction of the first shell wall 111, and the contour shape of the pole body 21 matches the contour shape of the adapter structure 22), and when the surrounding area 2201 protrudes from the inner end surface 211 of the pole body 21 toward the battery core component 3, the pole connecting portion of the conductive portion 36 can be completely laid flat on the inner end surface 211 of the pole body 21.

[0384] For example, in combination Figure 28 When the inner end surface 211 of the pole body 21 is relatively small (for example, the adapter structure 22 is configured as an elongated strip extending along the length of the first shell wall 111, and the pole body 21 is located in the center of the adapter structure 22 and has a circular outline), and when the surrounding area 2201 protrudes from the inner end surface 211 of the pole body 21 toward the battery cell component 3, the adapter 35 can be configured to include a first conductive segment 415 laid on the inner end surface 211 of the pole body 21, and a third conductive segment 417 offset from the inner end surface 211 of the pole body 21. The third conductive segment 417 protrudes relative to the first conductive segment 415 toward the battery cell component 3, and the tab assembly 33 is connected to the third conductive segment 417. In this way, the adapter 35 can meet the connection requirements with the inner end surface 211 of the pole body 21 and easily meet the connection requirements with the tab assembly 33. Furthermore, when the adapter 35 includes a first conductive segment 415 and a third conductive segment 417, to ensure that the third conductive segment 417 protrudes relative to the first conductive segment 415 toward the battery cell component 3, the adapter 35 can be made of a material with a certain hardness and thickness. For example, the adapter 35 can be a metal sheet. For example, if the portion connecting the tab assembly 33 and the third conductive segment 417 is elongated, the third conductive segment 417 can also be elongated, while the first conductive segment 415 can be configured to match the mating region 211a (e.g., circular) to meet the connection requirements.

[0385] Please refer to Figure 4 and Figure 5 In some embodiments, the housing component 1 includes a housing body 11 and a housing cover 12. The housing body 11 is an integral piece, and one end of the housing body 11 is open. The housing cover 12 is disposed at the open end of the housing body 11. For example, the open end of the housing body 11 has an opening, and the housing cover 12 is disposed on the opening. The housing body 11 and the housing cover 12 together form a receiving cavity 13. Figure 4 The first shell wall 111 is located at the end of the shell body 11 away from the shell cover 12, that is, the shell wall at the end of the shell body 11 opposite to the opening is the first shell wall 111; or, combined with Figure 5 , the first shell wall 111 is formed on the shell cover 12 , and the shell cover 12 serves as the first shell wall 111 .

[0386] Of course, in other examples, the shell component 1 can also include two shell bodies 11, one end of each shell body 11 is open to form an opening, the openings of the two shell bodies 11 are opposite to each other and cover each other, and the two shell bodies 11 together form a accommodating cavity 13, and the shell wall at one end of one shell body 11 opposite to the opening is the first shell wall 111.

[0387] In some embodiments, combined Figure 4 The housing component 1 includes a housing body 11 that forms an accommodating cavity 13. One end of the housing body 11 is open to form an opening, and the housing wall at the end of the housing body 11 opposite the opening is a first housing wall 111. It will be understood that the housing body 11 is an integrally formed component and includes the first housing wall 111 and a second housing wall 114. The second housing wall 114 surrounds the edge of the first housing wall 111 and extends from the edge of the first housing wall 111 toward one side in the thickness direction of the first housing wall 111. The end of the second housing wall 114 away from the first housing wall 111 defines an opening. A cavity is defined between the first housing wall 111 and the second housing wall 114, and the cavity constitutes at least a portion of the accommodating cavity 13.

[0388] When the shell component 1 includes a shell body 11 with an opening 113 at one end, the shell component 1 also includes a shell body matching structure, which matches the shell body 11 to cover the opening 113 and together with the shell body 11, encloses a accommodating cavity 13. For example, the shell body 11 is semi-closed cylindrical, and the shell body matching structure is flat, that is, the shell body matching structure can be a shell cover 12. At this time, the shell component 1 can be a combination of the shell body 11 and the shell cover 12. For another example, the shell body 11 is semi-closed cylindrical, and the shell body matching structure can be semi-closed cylindrical, that is, the shell body matching structure can be the other half of the shell body 11. At this time, the shell component 1 can be a combination of two shell bodies 11, etc. For another example, the shell body matching structure can be a shell group, which is composed of multiple parts. As a result, the shell components have various forms and can adapt to various application scenarios.

[0389] For example, in combination Figure 4 The shell component 1 may include a shell body 11 and a shell cover 12, one end of the shell body 11 has an opening 113, the shell cover 12 covers the opening 113, the shell body 11 and the shell cover 12 together form an accommodating cavity 13, and the end of the shell body 11 opposite to the opening 113 serves as a first shell wall 111; or, illustratively, the shell component 1 may include two shell bodies 11, one end of each shell body 11 has an opening 113, the openings 113 of the two shell bodies 11 are opposite to and cover each other, the two shell bodies 11 together form an accommodating cavity 13, and the end of one shell body 11 opposite to the opening 113 serves as the first shell wall 111.

[0390] In the above technical solution, when the shell wall at the end of the shell body 11 opposite the opening is the first shell wall 111, since the battery cell component 3 housed in the shell component 1 is connected to the terminal component 2 mounted on the first shell wall 111, when the battery 100 vibrates or deforms, the terminal components 2 connected by the busbar component will be pulled against each other. Since the terminal component 2 is disposed on the end wall of the shell body 11 opposite the opening 113, the force acting on the terminal component 2 is preferentially transmitted to the shell body 11, and does not directly act on the shell body mating structure (such as the shell cover 12). This not only prolongs the distance for the force to be transmitted to the connection between the shell body 11 and the shell body mating structure (such as the shell cover 12), but also preferentially deforms when subjected to force, thereby reducing the force acting on the connection between the shell body 11 and the shell body mating structure (such as the shell cover 12). This can effectively reduce the probability of cracking at the connection between the shell body 11 and the shell body mating structure (such as the shell cover 12) during use of the battery 100, thereby improving the reliability of the battery cell 102. Furthermore, because the connection between the housing 11 and the housing mating structure (e.g., the housing cover 12) is less susceptible to cracking, there is no need to increase the wall thickness of the housing 11 and the housing mating structure to improve the reliability of the connection. This helps reduce weight and material costs, and facilitates miniaturization of the battery cell 102 or increases the energy density of the battery cell 102. The connection method between the housing 11 and the housing mating structure is not limited, and can be, for example, bonding, welding, etc.

[0391] For example, when the end wall of the shell 11 opposite the opening 113 serves as the first shell wall 111 for mounting the pole component 2, if the pole component 2 is first mounted at the mounting hole 112 of the first shell wall 111 before the cell component 3 is installed into the shell 11, it will be difficult to connect the cell component 3 with the pole component 2. In some embodiments of the present application, the cell component 3 and the pole component 2 can be connected first, and then the pole component 2 can be assembled and connected to the shell component 1. This can meet the connection requirements between the cell component 3 and the pole component 2, and also meet the connection requirements between the pole component 2 and the shell component 1, thereby improving the reliability and workability of the battery cell 102.

[0392] Moreover, this processing sequence can effectively shorten the length of the conductive part 36. For example, as long as the battery cell component 3 and the pole component 2 are connected first, and the pole component 2 and the shell component 1 are connected later, it is sufficient. This can save the material and cost of the conductive part 36, reduce the redundancy of the conductive part 36, reduce the risk of short circuit, and reduce the space occupied by the conductive part 36 in the shell component 1, which is beneficial to improving the energy density of the battery cell 102.

[0393] Please refer to Figure 3In some embodiments of the present application, the battery cell 102 further includes a pressure relief component 6, which is disposed on the housing component 1. For example, the pressure relief component 6 can be an explosion-proof valve mounted on the housing component 1, or can be integrally formed in a thinned area of ​​the housing component 1. Thus, by providing the pressure relief component 6, when the pressure within the housing component 1 exceeds a preset value, the pressure can be directionally relieved through the pressure relief component 6, thereby improving the reliability of the battery cell 102. The pressure relief component 6 can be disposed on the first housing wall 111, or on other housing walls other than the first housing wall 111. There can be one or more first housing walls 111.

[0394] For example, in combination Figure 3 , the pressure relief component 6 is located on the same side as the terminal component 2. Since the terminal component 2 is provided on the first housing wall 111, when the pressure relief component 6 is also provided on the first housing wall 111, the pressure relief component 6 and the terminal component 2 are located on the same side. This simplifies the design of the housing walls other than the first housing wall 111, simplifying the structure and processing of the battery cell 102.

[0395] For example, the pressure relief component 6 is located on opposite sides of the pole component 2. Since the pole component 2 is located on the first housing wall 111, if the pressure relief component 6 is located on a wall of the housing component 1 other than the first housing wall 111, such as the second housing wall 114 or the housing cover 12, the pressure relief component 6 and the pole component 2 are located on opposite sides. This eliminates the need to reduce the volume of the pole component 2 by taking up space on the first housing wall 111 due to the pressure relief component 6, allowing for flexible design of the shape and volume of the pole component 2 as needed.

[0396] For example, the shell component 1 can be surrounded by multiple non-coplanar shell walls. For example, the rectangular shell wall component is surrounded by six shell walls, one of which is the first shell wall 111. The pressure relief component 6 is arranged on any shell wall other than the first shell wall 111, and the pole component 2 is arranged on the first shell wall 111, so that the two are located on opposite sides.

[0397] In a second aspect, the present invention provides a processing method for processing the battery cell 102. Figure 36 , processing methods include:

[0398] Step S10, extend all the tab groups 33 of the battery cell group 32A toward the middle position of the battery cell group 32A in the first direction; Step S20, install the battery cell component 3 into the accommodating cavity 13, and set one end of the battery cell component 3 with the tab group 33 on the inner side of the first shell wall 111 and opposite to the first shell wall 111; Step S30, install the pole component 2 on the first shell wall 111, and connect all the tab groups 33 to the pole body 21.

[0399] The “inner side of the first shell wall 111 ” refers to the side of the first shell wall 111 facing the battery cell body 32 in the thickness direction. Similarly, the “outer side of the first shell wall 111 ” refers to the side of the first shell wall 111 away from the battery cell body 32 in the thickness direction.

[0400] The order of “installing the pole component 2 on the first shell wall 111” and “connecting the tab group 33 to the pole body 21 through the adapter 35” is not limited in this application. The pole component 2 can be installed on the first shell wall 111 first, and then the tab group 33 can be connected to the pole body 21 through the adapter 35, or the tab group 33 can be connected to the pole body 21 through the adapter 35 first, and then the pole component 2 can be installed on the first shell wall 111.

[0401] In the above technical solution, before the battery cell component 3 is loaded into the accommodating cavity 13, all the tab groups 33 of the battery cell group 32A are first shaped so that all the tab groups 33 extend toward the middle position of the battery cell group 32A in the first direction. This can reduce the length of the tab group 33, improve the redundancy of the tab group 33, and reduce the risk of the tab group 33 being inserted upside down into the battery cell body 32 or into the root position of the tab group 33 connected to the battery cell body 32. At the same time, it is beneficial to improve the problems of wrinkling, bending and breaking of the tab sheet 311 of the tab group 33, thereby improving the reliability of the battery cell 102.

[0402] In the embodiment of the present application, the execution order of each step of the processing method is not based on the step number if there is no conflict, that is, the step number does not constitute a restriction on the execution order of each step.

[0403] Please refer to Figures 37-38D In some embodiments, the first shell wall 111 is formed with a mounting hole 112 , and one end of the battery core component 3 is connected to a conductive portion 36 , which includes a pole ear portion 332 , or the conductive portion 36 includes a pole ear portion 332 and an adapter 35 .

[0404] Step S30, mounting the pole component 2 on the first housing wall 111 and connecting all the tab groups 33 to the pole body 21, includes: Step S31, passing the end of the conductive portion 36 away from the cell body 32 through the mounting hole 112 to the outside of the first housing wall 111 to connect to the pole body 21; Step S32, placing the pole component 2 with the conductive portion 36 connected to it over the mounting hole 112 from the inside or outside of the first housing wall 111. This solution is applicable to scenarios where the adapter 35 is not provided, and is also applicable to scenarios where the adapter 35 is provided.

[0405] For example, if the above scheme is used for the scenario of setting the adapter 35, then "installing the pole component 2 on the first shell wall 111 and connecting all the tab groups 33 to the pole body 21" includes: passing the end of the adapter 35 away from the battery cell body 32 through the mounting hole 112 to the outside of the first shell wall 111 and connecting to the pole body 21; and covering the pole component 2 with the adapter 35 from the inside or outside of the first shell wall 111 on the mounting hole 112.

[0406] It can be seen that the above solution can be understood as follows: the conductive portion 36 first passes through the mounting hole 112, the conductive portion 36 is welded to the pole component 2 outside the mounting hole 112, and the pole component 2 then covers the mounting hole 112 from the outside or inside of the first shell wall 111. It can be understood that in the above solution, when the pole component 2 covers the mounting hole 11 from the inside of the first shell wall 111, the pole component 2 can be passed through the mounting hole 112 again so that the pole component 2 is located inside the first shell wall 111, thereby connecting the pole component 2 to the first shell wall 111.

[0407] For example, in step S31, the end of the conductive portion 36 away from the battery cell body 32 is passed through the mounting hole 112 to the outside of the first shell wall 111 to connect with the pole body 21. First, the end of the conductive portion 36 away from the battery cell body 32 is passed through the mounting hole 112 to the outside of the first shell wall 111, and then the conductive portion 36 that has passed to the outside of the first shell wall 111 is connected to the pole body 21 of the pole component 2 located outside the first shell wall 111. As a result, since the conductive portion 36 is not yet connected to the pole component 2 when passing through the mounting hole 112, it is easier for the conductive portion 36 to pass through the mounting hole 112, improving operational convenience. Moreover, since the welding position between the pole component 2 and the conductive portion 36 is located outside the first shell wall 111, the problem of conductive chips formed during welding entering the interior of the shell body 11 and causing damage to the battery cell component 3 can be improved.

[0408] Exemplarily, the mounting hole 112 is an elongated hole (e.g., rectangular, oval, or runway-shaped), and the portion of the conductive portion 36 that needs to pass through the mounting hole 112 is an elongated shape that matches the shape of the mounting hole 112. In this case, the thickness direction of this portion of the conductive portion 36 can be adjusted to match the width direction of the mounting hole 112, and the length direction of this portion of the conductive portion 36 is angled with the length direction of the mounting hole 112. In this way, this portion of the conductive portion 36 can pass through the mounting hole 112 smoothly, improving assembly efficiency and reducing the risk of collision and scratching between the conductive portion 36 and the housing component 1. However, the present application is not limited to this, and the mounting hole 112 and the portion of the conductive portion 36 that needs to pass through the mounting hole 112 can also be processed into other shapes, such as circular, polygonal, etc.

[0409] In the above scheme, the conductive part 36 first passes through the mounting hole 112, and the conductive part 36 is connected to the pole component 2 outside the mounting hole 112, and then the pole component 2 connected with the conductive part 36 is covered with the mounting hole 112. This scheme is applicable to the scenario where the shell cover 12 serves as the first shell wall 111, and is also applicable to the scenario where the shell body 11 includes the first shell wall 111. It is also applicable to the scenario described later where the tab group 33 is connected to the adapter 35 or the pole body 21 in the form of the laminated part 312 or the tab part 332.

[0410] Please refer to Figures 39-40D In some embodiments, the first housing wall 111 is formed with a mounting hole 112. Step S30, mounting the pole component 2 on the first housing wall 111 and connecting all tab assemblies 33 to the pole body 21, includes: Step S33, placing the cell component 3 inside the first housing wall 111, and connecting the end of the conductive portion 36 away from the cell body 32 to the pole body 21; Step S34, passing the pole component 2 with the conductive portion 36 connected thereto through the mounting hole 112 and then covering the mounting hole 112 from the inside or outside of the first housing wall 111. This solution is applicable both to scenarios where the adapter 35 is not provided and to scenarios where the adapter 35 is provided.

[0411] For example, if the above scheme is used for the scenario of setting the adapter 35, then "installing the pole component 2 on the first shell wall 111 and connecting all the tab groups 33 to the pole body 21" includes: placing the battery cell component 3 on the inner side of the first shell wall 111, and connecting the end of the adapter 35 away from the battery cell body 32 to the pole body 21; passing the pole component 2 connected with the adapter 35 through the mounting hole 112 and covering the mounting hole 112 from the inner or outer side of the first shell wall 111.

[0412] It can be seen that the above scheme can be understood as first connecting the conductive portion 36 to the pole component 2, that is, first connecting the battery cell component 3 to the pole component 2, then passing the pole component 2 through the mounting hole 112, and then covering the mounting hole 112 from the outside or inside of the first shell wall 111. Similarly, the battery cell component 3 and the pole component 2, and the pole component 2 and the first shell wall 111 can also be assembled. It can be understood that in the above scheme, when the pole component 2 connected to the conductive portion 36 covers the mounting hole 11 from the inside of the first shell wall 111, the pole component 2 connected to the conductive portion 36 does not need to pass through the mounting hole 112, and the mounting hole 112 can be covered from the inside of the first shell wall 111; alternatively, the pole component 2 connected to the conductive portion 36 can pass through the mounting hole 112 again so that the pole component 2 is located on the inside of the first shell wall 111, thereby connecting the pole component 2 connected to the conductive portion 36 to the first shell wall 111.

[0413] In the above scheme, the conductive portion 36 is first connected to the pole component 2, and then the pole component 2 is installed on the first shell wall 111. This scheme is applicable to scenarios where the shell cover 12 serves as the first shell wall 111, and is also applicable to scenarios where the shell body 11 includes the first shell wall 111. It is also applicable to scenarios where the free end 331 described below is connected to the adapter 35 or to the pole body 21 in the form of a laminated portion 312 or a pole ear portion 332.

[0414] Exemplarily, the pole component 2 includes a pole body 21 and a transition structure 22. "Installing the pole component 2 on the first shell wall 111" can be understood as installing the pole component 2 connected to the battery cell component 3 on the first shell wall 111, which can specifically include: setting the pole component 2 connected to the battery cell component 3 at the mounting hole 112, and connecting the transition structure 22 to the first shell wall 111.

[0415] Among them, "setting the pole component 2 connected to the battery cell component 3 at the mounting hole 112, and connecting the adapter structure 22 to the first shell wall 111" can specifically include: passing the pole component 2 connected to the battery cell component 3 from the inner side of the first shell wall 111 through the mounting hole 112 to the outside of the first shell wall 111; covering the pole component 2 that has passed through the outside of the first shell wall 111 at the mounting hole 112 from the outside of the first shell wall 111, so that the adapter structure 22 stops at the outside of the first shell wall 111; connecting the adapter structure 22 and the first shell wall 111 from the outside of the first shell wall 111. The adapter structure 22 stops at the outside of the first shell wall 111, which means that the adapter structure 22 is partially supported on the side of the first shell wall 111 away from the battery cell body 32.

[0416] Thus, because the cell component 3 and the pole component 2 are connected first and the pole component 2 is then passed through the mounting hole 112, there is no need to consider avoiding the first shell wall 111 when connecting the cell component 3 and the pole component 2. In other words, when connecting the cell component 3 and the pole component 2, the pole component 2 and the cell component 3 are not located on either side of the first shell wall 111, which helps to further shorten the length of the conductive portion 36, reduce the redundancy of the conductive portion 36 after assembly, reduce the risk of reverse insertion, and improve the reliability of the battery cell 102. Moreover, because the welding position of the pole component 2 and the cell component 3 is located outside the shell body 11, the problem of conductive chips formed during the welding process entering the interior of the shell body 11 and damaging the cell component 3 can be improved. Furthermore, since the pole component 2 covers the mounting hole 112 from the outside of the first shell wall 111, the adapter structure 22 is stopped at the outside of the first shell wall 111, and the adapter structure 22 is connected to the first shell wall 111 from the outside of the first shell wall 111, so as to facilitate the assembly and connection of the pole component 2 and the first shell wall 111, which is conducive to improving the connection reliability of the pole component 2 and the first shell wall 111.

[0417] Please refer to Figure 7 、 Figure 8 and Figure 41 In some embodiments, step S32, wherein the pole component 2 connected to the conductive portion 36 is placed in the mounting hole 112 from the inner side or the outer side of the first shell wall 111, includes step S30a, wherein when the pole component 2 is mounted on the first shell wall 111, the portion of the conductive portion 36 located between the first shell wall 111 and the battery cell body 32 is bent. In some other embodiments, step S34, wherein the pole component 2 connected to the conductive portion 36 is passed through the mounting hole 112 and then placed in the mounting hole 112 from the inner side or the outer side of the first shell wall 111, includes step S30a, wherein when the pole component 2 is mounted on the first shell wall 111, the portion of the conductive portion 36 located between the first shell wall 111 and the battery cell body 32 is bent.

[0418] For example, the conductive portion 36 includes a tab group 33 and an adapter 35. When the pole component 2 is mounted on the first shell wall 111, the portion between the tab group 33 and the adapter 35 after connection is bent.

[0419] Therefore, no matter which of the above situations is adopted, the conductive part 36 can play a buffering role. When the battery cell 102 is used in a vibration environment, the impact of the battery cell body 32 toward the first shell wall 111 can be reduced, thereby protecting the battery cell component 3 and improving the reliability of the battery cell 102. In addition, before the pole component 2 is installed on the first shell wall 111, the part of the conductive part 36 located between the first shell wall 111 and the battery cell body 32 can be basically in an expanded state, which is convenient for connecting the tab group 33 with the adapter 35, and / or, the adapter 35 with the pole body 21, and / or the tab group 33 with the pole body 21, so as to have sufficient operating space, for example, it is convenient to lay the part of the adapter 35 connected to the pole body 21 on the pole body 21 for connection, and it is convenient to lay the part of the tab group 33 connected to the pole body 21 on the pole body 21 for connection.

[0420] In the above-described embodiment, when the pole component 2 is installed on the first housing wall 111, the portion of the conductive portion 36 located between the first housing wall 111 and the cell body 32 is bent. This may include, but is not limited to, shaping the portion of the conductive portion 36 located between the first housing wall 111 and the cell body 32 to achieve a bent shape. The shaping method and timing are not limited. For example, it may be performed in conjunction with the movement of the pole component 2 covering the first housing wall 111, or in conjunction with the movement of the first pole member 21a covering the second pole member 21b, thereby improving processing efficiency. Of course, when the pole component 2 is installed on the first housing wall 111, it is not necessary to shape the portion of the conductive portion 36 located between the first housing wall 111 and the cell body 32. Since the installation of the pole component 2 reduces the space, the conductive portion 36 is subjected to external forces and bends at a relatively weak location.

[0421] It is understood that the portion of the conductive portion 36 located between the first shell wall 111 and the battery cell body 32 is bent. After this process is completed, the current state of the battery cell 102 may be: the conductive portion 36 is bent to form at least one open slot, for example, the tab assembly 33 is bent to form at least one open slot (including the first open slot 334), and / or the adapter 35 is bent to form the second open slot 355. For example, after the above process is completed, the tab assembly 33 is bent to form the first open slot 334, and the adapter 35 is bent to form the second open slot 355. The conductive portion 36 generally has a reciprocating serpentine shape, which can simplify the above steps, shorten the length of the conductive portion 36, simplify the structure of the conductive portion 36, and facilitate the processing of the conductive portion 36.

[0422] Please combine Figures 38A-38E and Figure 42 In some embodiments, the battery cell 102 includes an insulating bracket 42 located on the inner side of the first shell wall 111. The insulating bracket 42 can be provided on a side of the battery cell component 3 close to the pole component 2. The insulating bracket 42 has a through-hole 40, and the tab group 33 is provided through the through-hole 91. Step S30a, when the pole component 2 is installed on the first shell wall 111, the portion of the conductive portion 36 located between the first shell wall 111 and the battery cell body 32 is bent, including: step S301, when the pole component 2 is installed on the first shell wall 111, the portion of the conductive portion 36 located between the first shell wall 111 and the battery cell body 32 is bent to form at least one open groove; step S302, a portion of the insulating bracket 42 is inserted into the at least one open groove so that the insulating bracket 42 can prevent the conductive portion 36 from moving toward the battery cell body 32.

[0423] Exemplarily, when the pole component 2 is installed on the first shell wall 111, the step of making the portion located between the first shell wall 111 and the battery cell body 32 after the pole tab group 33 and the adapter 35 are connected to be bent includes: when the pole component 2 is installed on the first shell wall 111, the portion located between the first shell wall 111 and the battery cell body 32 after the pole tab group 33 and the adapter 35 are connected is bent to form a first opening groove 334 or a second opening groove 355, the free end 331 defines at least a portion of the groove wall on one side of the first opening groove 334 close to the pole body 21, and the adapter 35 forms a second opening groove 355; a portion of the insulating bracket 42 is inserted into the first opening groove 334 and / or the second opening groove 355, so that the insulating bracket 42 can prevent the conductive part 36 from moving toward the battery cell body 32.

[0424] For example, “bending the portion of the conductive portion 36 between the first shell wall 111 and the battery cell body 32 to form at least one open groove” and “partially inserting the insulating bracket 42 into the at least one open groove P” can be performed simultaneously.

[0425] Please refer to Figure 40C 、 Figure 40D and Figure 43 In some embodiments, the battery cell 102 includes an insulating bracket 42 located inside the first shell wall 111; the conductive portion 36 includes an adapter 35 and at least one tab portion 332; step S30a, when the pole component 2 is installed on the first shell wall 111, making the portion of the conductive portion 36 between the first shell wall 111 and the battery cell body 32 bendable, includes: step S303, when the pole component 2 is installed on the first shell wall 111, making the tab group 33 and the adapter 35 connected, the tab portion located between the first shell wall 111 and the battery cell body 32 The group 33 is bent to form a first opening groove 334, and the adapter 35 is bent to form a second opening groove 355. The second opening groove 355 is adjacent to the first opening groove 334 and is located on the side of the first opening groove 334 facing the pole body 21. The opening directions of the second opening groove 355 and the first opening groove 334 are arranged at an angle; in step S304, part of the insulating bracket 42 is inserted into at least one of the first opening groove 334 and the second opening groove 355, so that the insulating bracket 42 can prevent the tab group 33 and / or the adapter 35 from moving toward the battery cell body 32.

[0426] For example, when the cell body 32 connected to the conductive portion 36 is located inside the insulating support 42, and the pole component 2 connected to the conductive portion 36 is located outside the first shell wall 111, "bending and deforming the portion of the conductive portion 36 located between the pole component 2 and the cell body 32 into a first opening groove 334 and a second opening groove 355 with openings facing in opposite directions" may specifically include: as the pole component 2 is positioned toward the first shell wall 111, the conductive portion 36 forms two opening grooves P with openings facing in opposite directions on the inside and outside of the insulating support 42, i.e., the conductive portion 36 forms one opening groove P (i.e., the first opening groove 334) on the inside of the insulating support 42, and another opening groove P (i.e., the second opening groove 355) on the outside of the insulating support 42. Thus, by providing the insulating support 42, the conductive portion 36 is facilitated to bend into the first opening groove 334 and the second opening groove 355 with openings facing in opposite directions, thereby reducing processing difficulty.

[0427] Please refer to Figure 45 In some embodiments, in step S31 and / or step S33, the step of connecting the end of the conductive portion 36 away from the cell body 32 to the terminal body 21 includes: step S30b, adjusting the angle of the terminal component 2 so that the normal direction of the inner end surface 211 of the terminal body 21 is close to the stacking direction of the multiple cell bodies 32. In step S32 and / or step S34, the step of placing the terminal component 2 with the conductive portion 36 connected to the mounting hole 112 includes: step S30c, adjusting the angle of the terminal component 2 on the outside of the first shell wall 111 so that the normal direction of the inner end surface 211 of the terminal body 21 is close to perpendicular to the stacking direction of the multiple cell bodies 32 (e.g., the fourth direction F4), and the conductive portion 36 is bent and deformed to form at least one open slot. This solution is applicable to scenarios where the conductive portion 36 includes at least one tab group 33, and also to scenarios where the conductive portion 36 includes an adapter 35 and at least one tab group 33.

[0428] In this embodiment, the step of stacking the plurality of battery cell bodies 32 may be performed before or after the conductive portion 36 is connected to the pole component 2 .

[0429] The phrase "the normal direction of the inner end surface 211 of the pole body 21 is close to the stacking direction of the multiple cell bodies 32" means that the normal direction of the inner end surface 211 of the pole body 21 is consistent or substantially consistent with the stacking direction of the multiple cell bodies 32. Substantially consistent can be understood as a small angle between the two, for example, less than 10°. The phrase "arranging the pole component 2 on one side of the protruding tab group 33 of the cell component 3" can be understood as: the tab group 33 is located on one side of the cell body 32, and the pole component 2 and the tab group 33 are arranged on the same side of the cell body 32, thereby facilitating shortening the length of the tab portion 332. In the above technical solution, the "length of the tab portion 332" is such that: when the normal direction of the inner end surface 211 of the pole body 21 of the pole component 2 is close to the stacking direction of the multiple cell bodies 32, the pole component 2 can be located on one side of the protruding tab portion 332 of the cell component 3, and the adapter 35 can be laid on the inner end surface 211 of the pole body 21.

[0430] In the above technical solution, by first adjusting the position and angle of the pole component 2 so that the normal direction of the inner end face 211 of the pole body 21 is close to the stacking direction of multiple battery cell bodies 32, and then the part of the conductive part 36 connected to the pole body 21 is laid on the inner end face 211 of the pole body 21, there is no need to adjust the angle of the pole body 21. There is enough space near the matching position of the part of the conductive part 36 connected to the pole body 21 and the inner end face 211 of the pole body 21 to perform the welding operation of the conductive part 36 and the pole body 21, thereby simplifying the operation and making the length of the pole ear portion 332 shorter. Then, when adjusting the angle of the pole component 2 to connect with the first shell wall 111, the conductive part 36 can be bent to form at least one open groove.

[0431] In the above technical solution, the conductive part 36 is bent to form at least one open slot. When the conductive part 36 includes the tab group 33, the tab group 3 is bent to form at least one open slot. When the conductive part 36 includes the tab group 33 and the adapter 35, the tab group 33 is bent to form at least one open slot, and / or the adapter 35 is bent to form at least one open slot.

[0432] Please refer to Figure 46 In some embodiments, one end of the battery cell body 32 is connected to a conductive portion 36, and the conductive portion 36 includes a pole ear portion 332 and an adapter 35; step S30c specifically includes step S30d, when the pole column component 2 is installed on the first shell wall 111, the pole ear group 33 and the adapter 35 are connected, and the pole ear 33 is bent to form a first opening groove 334, and the adapter 35 extends into the first opening groove 334, and the pole ear portion 332 is formed as a groove wall of the first opening groove 334 facing the pole column component 2, and the adapter 35 can be used to prevent the pole ear portion 332 from moving toward the battery cell body 32, thereby reducing the risk of the pole ear group 33 being inserted upside down into the battery cell body 32 and causing a short circuit.

[0433] Thus, the tab group 33 and the pole body 21 are indirectly connected through the adapter 35 to form electrical conduction, which can shorten the length of the tab group 33 and improve the redundancy of the tab group 33, which is beneficial to improving the problems of wrinkling, bending and breaking of the tab sheet 311 of the tab group 33. At the same time, since the tab group 33 is relatively short and the adapter 35 has certain restrictions on the tab group 33 due to its connection with the tab group 33, it is beneficial to reduce the risk of short circuit caused by the tab group 33 being inserted upside down into the battery cell body 32. The shape and material of the adapter 35 can be flexibly designed to reduce the difficulty of connecting the adapter 35 with the pole body 21 and the difficulty of connecting the adapter 35 with the tab group 33, which is beneficial to improving the assembly convenience of the battery cell 102.

[0434] Moreover, the adapter 35 supports the tab portion 332 of the tab group 33. For example, a portion of the adapter 35 can be supported on the side of the tab portion 332 of the tab group 33 facing the battery cell body 32, or a portion of the adapter 35 can be supported on the side of the tab portion 332 of the tab group 33 facing away from the pole body 21, so that the tab portion 332 of the tab group 33 is located between the portion of the adapter 35 supporting the tab portion 332 and the inner end surface 211 of the pole body 21. The above-mentioned supporting arrangement of 5 can prevent the pole ear portion 332 from moving toward the battery cell body 32. For example, when the pole ear group 33 is subjected to external force so that the pole ear group 33 has a tendency to move toward the battery cell body 32, the adapter 35 can apply a reaction force to the pole ear portion 332 to hinder the movement trend of the pole ear group 33 toward the battery cell body 32, thereby reducing the risk of the pole ear group 33 moving toward the battery cell body 32 and causing a short circuit due to the inverted insertion into the battery cell body 32, which is beneficial to improving the reliability of the battery cell 102.

[0435] It can be understood that in the step of “installing the pole component 2 on the first shell wall 111, so that the pole tab group 33 and the adapter 35 are connected, the pole tab group 33 is bent to form the first open groove 334, and the adapter 35 extends into the first open groove 334”, the pole tab group 33 is first connected to the pole body 21 through the adapter 35, and then the pole component 2 is installed on the first shell wall 111, then the battery cell component 3 is first connected to the pole component 2, and then the pole component 2 connected to the battery cell component 3 is installed on the first shell wall 111. Since the pole component 2 has various forms, it can be in the form of an integral and inseparable incoming material, or it can be in the form of multiple parts assembled later. At this time, “installing the pole component 2 connected to the battery cell component 3 on the first shell wall 111” is understood in a broad sense, that is, the part connecting the pole component 2 and the battery cell component 3 can be assembled to the first shell wall 111.

[0436] For example, when the pole component 2 does not need to be assembled, "connecting the battery cell component 3 to the pole component 2; installing the pole component 2 connected to the battery cell component 3 to the first shell wall 111" can be specifically as follows: "first connect the pole component 2 to the battery cell component 3, and then install the pole component 2 to the first shell wall 111 (for example, cover the pole component 2 at the installation hole 112 on the first shell wall 111, and then connect the pole component 2 to the first shell wall 111, such as welding, riveting, or bonding)".

[0437] For example, when the pole component 2 needs to be assembled, "connecting the battery cell component 3 to the pole component 2; installing the pole component 2 connected to the battery cell component 3 to the first shell wall 111" can also be: "first complete the connection of a part of the pole component 2 (for example, the first pole component) to the battery cell component 3, and the connection of the remaining part of the pole component 2 (for example, the second pole component) to the first shell wall 111, and then combine and connect the above two parts of the pole component 2."

[0438] Since the connection between the cell component 3 and the terminal component 2 is completed before the terminal component 2 and the housing component 1 are assembled, rather than pre-assembling the terminal component and the housing component first and then connecting the cell component and the terminal component, this method helps shorten the length of the conductive portion 36 connecting the terminal component 2 and the cell component 3, reduces the redundancy of the conductive portion 36 within the housing component 1, and reduces the space occupied by the conductive portion 36 within the housing component 1, which helps improve the energy density of the battery cell 102. It also helps reduce the risk of the conductive portion 36 being inserted into the cell body 32 of the cell component 3 and causing a short circuit, thereby improving the reliability of the battery cell 102. In addition, this assembly method can achieve assembly of the battery cell 102 regardless of whether the terminal component 2 is positioned on the housing 11 or the housing cover 12, thus allowing for flexible selection of the installation position of the terminal component 2 on the housing component 1. Specifically, when the terminal component 2 is positioned on the housing 11, it helps reduce the problem of cracking at the connection between the housing 11 and the housing cover 12, thereby improving the reliability of the battery cell 102.

[0439] Please refer to Figure 47 In some embodiments, step S30d specifically includes step S30e. When the terminal component 2 is mounted on the first housing wall 111, the adapter 35 is bent to form a second opening slot 355. The second opening slot 355 is adjacent to the first opening slot 334 and is located on the side of the first opening slot 334 facing the terminal body 21. The openings of the second opening slot 355 and the first opening slot 334 are arranged at an angle. At least a portion of the groove wall of the second opening slot 355 facing the battery cell body 32 extends into the first opening slot 334 to improve the adapter 35's support reliability for the tab assembly 33. Furthermore, at this time, at least a portion of the conductive portion 36 can form a serpentine shape, providing a buffering and supporting effect.

[0440] Please refer to Figure 48 In some embodiments, a conductive portion 36 is connected to one end of the cell body 32. The conductive portion 36 includes a tab group 33 and an adapter 35. The tab group 33 includes multiple tab pieces 311. Step S10, extending all tab groups 33 of the cell group 32A toward the middle of the cell group 32A in the first direction, includes: Step S11, converging the multiple tab pieces 311 toward the middle to form a laminated portion 312 at the free end 331; and Step S12, connecting the laminated portion 312 to the adapter 35. The laminated portion 312 refers to the multiple tab pieces 311 that are merely gathered at the free end 331 but not connected, to achieve the shaping of the tab group 33 and facilitate subsequent connection to the adapter 35.

[0441] Please refer to Figure 49 In some embodiments, step S12, connecting the laminated portion 312 to the adapter 35, includes: step S121, connecting the plurality of tabs 311 of the tab assembly 33 at the laminated portion 312 to form a tab portion 332; and step S122, connecting at least a portion of the tab portion 332 to the adapter 35. It can be seen that the laminated portion 312 is pre-connected to form a tab portion 332 with a certain degree of rigidity, rather than a fluffy, multi-layered foil. This facilitates the connection between the tab portion 332 and the adapter 35, and makes the welding between the tab portion 332 and the adapter 35 more reliable. Porosity is less likely to form in the weld, thereby improving the connection reliability and conductivity of the weld, and making the electrical conduction between the battery cell component 3 and the pole post component 2 more stable and reliable. The multiple layers of tab sheets 311 in the tab portion 332 are electrically connected, that is, the multiple layers of tab sheets 311 in the tab portion 332 are not only stacked but also connected and conductive.

[0442] In some embodiments, step S12 includes the step of connecting the laminate portion 312 to the adapter 35, including directly connecting at least a portion of the laminate portion 312 to the adapter 35. It can be seen that the laminate portion 312 can be directly connected to the adapter 35 without pre-connection, which helps to simplify the processing process and improve processing efficiency. When the laminate portion 312 is connected to the adapter 35, the laminate portion 312 forms the tab portion 332, which can also achieve a reliable connection between the laminate portion 312 and the adapter 35.

[0443] In some examples, whether the pole ear portion 332 is connected to the adapter 35 or the lamination portion 312 is connected to the adapter 35, the connection position can be such that after the pole component 2 is installed on the first shell wall 111, at least a portion of the pole ear portion 332 is connected to a side of a portion of the adapter 35 that is away from the battery cell body 32, so that the adapter 35 supports the pole ear portion 332, and the adapter 35 can prevent the pole ear portion 332 from moving toward the battery cell body 32.

[0444] In the above scheme, when there is only one battery cell body 32, all the tabs 311 of the battery cell body 32 are converged to form a laminated portion 312 at the free end 331; when multiple battery cell bodies 32 constitute a group of battery cell groups 32A, and the battery cell groups 32A are a group, the tabs 311 of the battery cell groups 32A are converged to form a laminated portion 312 at the free end 331; and when there are multiple battery cell groups 32A, the tabs 311 of each battery cell group 32A are converged to form a laminated portion 312 at the free end 331. At this time, there can be multiple laminated portions 312, and each laminated portion 312 is connected to the adapter 35, or each laminated portion 312 forms a tab portion 332 and then is connected to the adapter 35.

[0445] In the above scheme, if there are multiple battery cell bodies 32, before connecting the tab group 33 to the adapter 35, multiple battery cell bodies 32 are stacked first, and the tabs 311 of the same polarity of multiple battery cell bodies 32 in the same battery cell group 32A are gathered together to form a stacking portion 312. Compared with gathering the tabs 311 of each battery cell body 32 separately to form a stacking portion 312, and connecting the stacking portion 312 of each battery cell assembly 31 separately to the adapter 35, and then multiple stacking is performed. As for the technical solution of stacking the battery cell bodies 32, on the one hand, the total number of the lamination parts 312 and the adapters 35 can be reduced, the connection steps of the lamination parts 312 and the adapters 35 can be reduced, and the processing efficiency can be improved. On the other hand, it can avoid the problem of tensile stress formed between the tabs 311 of different battery cell bodies 32 when the lamination parts 312 and the adapters 35 are connected first and the battery cell bodies 32 are stacked later, resulting in cracks at the connection position between the tab group 33 and the battery cell body 32.

[0446] It can be understood that no matter the free end 331 is connected to the adapter 35 in the form of the laminated portion 312 or the ear portion 332, the free end 331 and the adapter 35 can be stacked along the thickness direction of the free end 331 to facilitate the matching and connection between the free end 331 and the adapter 35.

[0447] In the above solution, no matter there are one or more battery cell bodies 32 or how the free end 331 is connected to the adapter 35 , it is applicable to both scenarios where the shell cover 12 serves as the first shell wall 111 and scenarios where the shell body 11 includes the first shell wall 111 .

[0448] Please refer to Figure 50In some embodiments, the end of the adapter 35 away from the pole body 21 has a clamping structure 356, and the clamping structure 356 includes two oppositely arranged clamping portions 3561; at this time, step S12, connecting the laminated portion 312 with the adapter 35 includes: step S124, clamping the free end 331 with the two clamping portions 3561 from both sides of the free end 331; step S125, connecting both clamping portions 3561 to the free end 331.

[0449] It is understood that the free end 331 can be coupled to the clamping structure 356 in the form of the laminated portion 312 or in the form of the tab portion 332. Thus, the two clamping portions 3561 can protect the free end 331, thereby improving the problem of the free end 331 being prone to cracking during the connection process with the clamping structure 356, and improving the connection reliability between the adapter 35 and the tab assembly 33.

[0450] Exemplarily, before the clamping structure 356 is engaged with the free end 331, the two clamping parts 3561 are first opened, for example, one of the clamping parts 3561 is flipped in a direction away from the other clamping part 3561 to increase the angle between the two clamping parts 3561, so as to facilitate the free end 331 to be quickly engaged between the two clamping parts 3561; then the free end 331 is engaged between the two clamping parts 3561, and the angle between the two clamping parts 3561 is reduced, so that the two clamping parts 3561 are clamped on both sides of the thickness of the free end 331, and then the clamping structure 356 is connected to the free end 331.

[0451] Please refer to Figure 51 In some embodiments, the adapter 35 includes a plurality of adapter foils 350. In this case, before step S12, connecting the laminated portion 312 to the adapter 35, the processing method further includes: step S10a, stacking the plurality of adapter foils 350; step S10b, connecting partial regions of the stacking to form a first connecting portion 351, thereby achieving connection between the plurality of adapter foils 350, improving the compactness of the adapter foils 350 in the first connecting portion 351, and facilitating connection between the adapter 35 and the pole component 2. Step S12, connecting the laminated portion 312 to the adapter 35, includes: step S126, connecting partial regions of the stacking of the plurality of adapter foils 350 to the free end 331, so that the stacking partial regions form a second connecting portion 352 spaced apart from the first connecting portion 351; and step S127, connecting the first connecting portion 351 to the pole body 21.

[0452] As can be seen, in the above solution, "connecting the plurality of transition foils 350 to the free end 331" and "connecting the stacked portions of the plurality of transition foils 350 to form the second connection portion 352" can be performed simultaneously, which helps simplify the manufacturing process. There is no specific restriction on the order of "forming the second connection portion 352" (connecting the stacked portions of the plurality of transition foils 350 to the free end 331 to form the second connection portion 352 spaced apart from the first connection portion 351) and "connecting the first connection portion 351 to the terminal body 21."

[0453] Of course, in other embodiments of the present application, when the adapter 35 includes multiple adapter foils 350, the step of connecting one end of the adapter 35 to the tab group 33 and the other end to the pole body 21 can also be constructed to include: connecting the stacked partial areas of the multiple adapter foils 350 to form a second connection part 352, and then connecting the second connection part 352 to the free end 331; that is, "connecting the multiple adapter foils 350 to the free end 331" and "connecting the stacked partial areas of the multiple adapter foils 350 to form the second connection part 352" are performed separately and successively.

[0454] It can be understood that in the above scheme, whether the stacked partial area of ​​multiple transition foils 350 is connected to the free end 331 so that the stacked partial area forms a second connection part 352 spaced apart from the first connection part 351, or the second connection part 352 is formed first and then the second connection part 352 is connected to the free end 331, the free end 331 can be connected in the form of a laminated part 312, or the free end 331 can also be connected in the form of a pole ear part 332.

[0455] Please refer again Figure 52 In some embodiments, the shell component 1 includes a shell body 11 and a shell cover 12, and the shell body 11 has an opening 113; when the end wall of the shell body 11 opposite to the opening 113 is the first shell wall 111, step S20, loading the battery core component 3 into the accommodating cavity 13, and setting one end of the battery core component 3 with the tab group 33 on the inner side of the first shell wall 111 and opposite to the first shell wall 111 includes: step S21, loading the battery core component 3 into the accommodating cavity 13 from the opening 113; step S22, extending the tab group 33 from the mounting hole 112 so that the end of the battery core component 3 with the tab group 33 is set on the inner side of the first shell wall 111 and opposite to the first shell wall 111; step S23, covering the shell cover 12 on the opening 113.

[0456] In the above solution, "loading the battery core component 3 into the accommodating cavity 13, and arranging the battery core component 3 on the inner side of the first shell wall 111 and opposite to the first shell wall 111" may include: adjusting the relative positions of the shell body 11, the battery core component 3, and the conductive portion 36 so that the battery core component 3 is located on the side of the adapter 35 connected thereto, away from the shell body 11, and the opening 113 of the shell body 11 faces the adapter 35, and then loading the battery core component 3 and the adapter 35 into the shell body 11 through the opening 113. There is no specific limitation on the order of "loading the battery core component 3 into the accommodating cavity 13 through the opening 113" and "extending the tab assembly 33 from the mounting hole 112 so that the end of the battery core component 3 where the tab assembly 33 is provided is located on the inner side of the first shell wall 111 and opposite to the first shell wall 111", for example, both can be performed simultaneously.

[0457] Therefore, by arranging the terminal component 2 at the end of the shell 11 opposite the opening 113, cracking at the connection between the shell 11 and the shell cover 12 can be alleviated, thereby improving the reliability of the battery cell 102. Specifically, "adjusting the relative positions of the shell 11, the battery cell component 3, and the conductive portion 36" can be achieved by adjusting the position of the shell 11 or the battery cell component and the conductive portion; and "inserting the battery cell component 3 and the adapter 35 into the shell 11 through the opening 113" can be achieved by pushing the battery cell component or inserting the shell.

[0458] For example, the adapter 35 can be inserted through the mounting hole 112 and out of the first housing wall 111 as the battery cell 3 is installed into the housing 11. That is, the adapter 35 is inserted through the mounting hole 112 as the battery cell 3 is installed into the housing, making the operation more convenient and improving processing efficiency.

[0459] For example, when assembling the battery cell 102, the tab group 33 can be connected to the adapter 35 to form the conductive part 36 first, and then the battery cell component 3 is installed into the shell body 11 in the direction of the conductive part 36 relative to the battery cell body 32 toward the mounting hole 112. As the battery cell component 3 moves into the shell body 11, the conductive part 36 passes through to the outside of the mounting hole 112, and the conductive part 36 is connected to the pole component 2 placed on the outside of the first shell wall 111 on the outside of the first shell wall 111. Then, the pole component 2 connected with the conductive part 36 is covered on the mounting hole 112 from the outside of the first shell wall 111, and then the pole component 2 covering the mounting hole 112 is connected to the first shell wall 111.

[0460] Please refer to Figure 53In some embodiments, the shell component 1 includes a shell body 11 and a shell cover 12, and the shell body 11 has an opening 113; when the shell cover 12 is a first shell wall 111, step S20, loading the battery core component 3 into the accommodating cavity 13, and arranging one end of the battery core component 3 with the tab group 33 on the inner side of the first shell wall 111 and opposite to the first shell wall 111 includes: step S24, supporting the battery core component 3 on the inner side of the shell cover 12; step S25, extending the tab group 33 from the mounting hole 112 so that the end of the battery core component 3 with the tab group 33 is arranged on the inner side of the first shell wall 111 and opposite to the first shell wall 111; step S26, sleeved the shell body 11 on the outer side of the battery core component 3, and connected the shell body 11 to the shell cover 12.

[0461] For example, “connecting the adapter 35 extending outward from the first shell wall 111 with the pole body 21 of the pole component 2 placed on the outside of the first shell wall 111” can be performed after “connecting the shell body 11 with the shell cover 12”; or, in other embodiments of the present application, “connecting the conductive portion 36 extending outward from the first shell wall 111 with the pole body 21 of the pole component 2 placed on the outside of the first shell wall 111” can also be performed before “putting the shell body 11 on the outside of the battery core component 3”.

[0462] Thus, by first completing the connection between the housing 11 and the housing cover 12 and then connecting the pole component 2 to the housing cover 12, the housing 11 can be used to accommodate the battery cell component 3 and support the housing cover 12. This facilitates positioning and supporting the housing cover 12, facilitates the connection between the housing cover 12 and the adapter structure 22, and improves the connection reliability between the housing cover 12 and the pole component 2. The housing 11 and the housing cover 12 can be connected in any manner, such as welding, bonding, etc.

[0463] For example, “passing the adapter 35 through the mounting hole 112 to the outside of the first shell wall and connecting it to the pole body 21” can be performed after “connecting the shell body 11 to the shell cover 12”; or, in other embodiments of the present application, “connecting the adapter 35 passing through the outside of the first shell wall 111 to the pole body 21 of the pole component 2 placed on the outside of the first shell wall 111” can also be performed before “putting the shell body 11 on the outside of the battery core component 3”.

[0464] Therefore, by first completing the connection between the shell body 11 and the shell cover 12, and then connecting the pole component 2 to the shell cover 12, the shell body 11 can be used to accommodate the battery core component 3 and support the shell cover 12, which makes it easier to position and support the shell cover 12, so as to facilitate the connection between the shell cover 12 and the adapter structure 22, and improve the connection reliability between the shell cover 12 and the pole component 2.

[0465] Please refer to Figure 49In some embodiments, when the end wall of the housing 11 opposite the opening 113 is the first housing wall 111, before inserting the battery cell component 3 into the accommodating cavity 13 through the opening in step S21, the processing method further includes wrapping the insulating film 41 around the outer side of the battery cell body 32 in step S27. Thus, the battery cell component 3 and the insulating film 41 are inserted into the housing together, facilitating the placement of the insulating film 41 and facilitating the insulation between the battery cell component 3 and the housing component 1.

[0466] Please refer to Figure 54 In some embodiments, when the housing cover 12 is the first housing wall 111, before step S26, in which the housing body 11 is placed on the outside of the battery cell component 3, the processing method further includes step S28, in which an insulating film 41 is wrapped around the outside of the battery cell body 32. This allows the battery cell component 3 and the insulating film 41 to cooperate with the housing body 11 to complete the housing insertion operation, facilitating the placement of the insulating film 41 and facilitating the insulation between the battery cell component 3 and the housing component 1.

[0467] It can be understood that when the shell cover 12 is the first shell wall 111, there is no specific restriction on the order of "supporting the battery cell component 3 on the inner side of the shell cover 12" and "extending the tab group 33 from the mounting hole 112 so that one end of the battery cell component 3 on which the tab group 33 is arranged is arranged on the inner side of the first shell wall 111 and opposite to the first shell wall 111" and "wrapping the insulating film 41 on the outer side of the battery cell body 32". It is only necessary to complete the covering of the insulating film 41 before the shell body 11 is sleeved on the outside of the battery cell component 3.

[0468] For example, please refer again to Figures 55A-55F In some embodiments of the present application, when the housing cover 12 is the first housing wall 111, an insulating support 42 may be provided on the inner side of the housing cover 12. Before the housing body 11 is placed over the battery cell component 3, the battery cell component 3 is positioned so that its connected conductive portion 36 faces downward, and the housing cover 12 is positioned so that the insulating support 42 faces upward. An insulating film 41 is then applied to the battery cell component 3 supported on the top of the insulating support 42, and the insulating film 41 is connected to the insulating support 42. In this case, the step of "placement of the housing body 11 over the battery cell component 3" specifically includes: "placement of the housing body 11 so that the opening 113 faces downward, and placement of the housing body 11 from top to bottom over the battery cell component 3 covered with the insulating film 41."

[0469] Among them, the step of "placing the battery core component 3 so that the conductive part 36 connected to it faces downward, and placing the shell cover 12 so that the insulating bracket 42 faces upward" can be performed before "the other end of the adapter 35 passes through the mounting hole 112 to the outside of the first shell wall 111", or it can also be performed after "the other end of the adapter 35 passes through the mounting hole 112 to the outside of the first shell wall 111".

[0470] The process of "wrapping the insulating film 41 around the battery cell component 3 supported on the top of the insulating support 42 to connect the insulating film 41 to the insulating support 42" is performed while the insulating support 42 is supported on the bottom of the battery cell body 32 and the adapter 35 is extended through the mounting hole 112 to the outside of the first shell wall 111. In this state, the battery cell component 3 does not require any other fixtures to support and limit its position, facilitating quick operation.

[0471] In the above technical solution, when the shell cover 12 is the first shell wall 111, when the shell body 11 is inserted into the outer surface of the battery core component 3, since the shell cover 12 is not connected to the battery core component 3, an insulating bracket 42 is provided on the inner side of the shell cover 12 (i.e., the side away from the battery core body 32) to support the battery core component 3 from the bottom. In this way, no other limiting clamps are required, and the problem of separation of the battery core component 3 and the shell cover 12 can be avoided. Therefore, during assembly, it is only necessary to directly insert the shell body 11 from top to bottom, thereby simplifying the assembly process and reducing the use of limiting clamps and the like.

[0472] Please refer again Figures 55A-55F In some embodiments of the present application, when the shell cover 12 is the first shell wall 111, when assembling the battery cell 102, the following steps can be performed in sequence: "Place the battery cell component 3 so that the conductive portion 36 connected to it faces downward, and place the shell cover 12 so that the insulating bracket 42 faces upward", "Place the battery cell component 3 and the conductive portion 36 connected to the battery cell component 3 on the inner side of the first shell wall 111, and pass the conductive portion 36 through the mounting hole 112 to the outer side of the first shell wall 111", "Cover the battery cell component 3 supported on the top of the insulating bracket 42 with the insulating film 41, so that the insulating film 41 is connected to the insulating bracket 42", " Place the shell body 11 so that the opening 113 faces downward, and put the shell body 11 over the battery core component 3 covered with the insulating film 41 from top to bottom", "Connect the shell body 11 to the shell cover 12", "Connect the conductive part 36 that passes through the outside of the first shell wall 111 to the pole body 21 of the pole component 2 placed on the outside of the first shell wall 111", "Install the pole component 2 connected to the conductive part 36 from the outside of the first shell wall 111 to the mounting hole 112, so that the adapter structure 22 stops at the outside of the first shell wall 111", "Connect the adapter structure 22 to the first shell wall 111 from the outside of the first shell wall 111".

[0473] For example, please refer again to Figures 55A-55FWhen assembling the battery cell 102, multiple battery cell bodies 32 are stacked along the thickness direction (e.g., the fourth direction F4) of the battery cell body 32. The stacked multiple battery cell bodies 32 are bound with a binding member 8 (e.g., blue glue). The multiple layers of tabs 311 of the multiple battery cell bodies 32 with the same polarity are stacked and gathered to form a stacked portion 312. The stacked portion 312 is clamped between the two clamping portions 4110 of the adapter 35, and the stacked portion 312 and the clamping portion 4110 are welded to obtain a structure consisting of the tab portion 33. 2 and the adapter 35 to form the conductive portion 36. Place the shell cover 12 below the battery body 32 and position the shell cover 12 so that the insulating bracket 42 faces upward. The battery body 32 is supported on the insulating bracket 42. Then, cover the battery body 32 with the insulating film 41. The lower end of the insulating film 41 is hot-melt-connected to the insulating bracket 42. Then, position the shell body 11 so that the opening 113 faces downward. Slide the shell body 11 over the battery body 32 from top to bottom and weld the lower end of the shell body 11 to the shell cover 12. Afterwards, the shell body 11 is laid flat, the mounting hole 112 is opened horizontally, the conductive portion 36 is connected to the pole component 2 placed on the outside of the shell cover 12 on the outside of the shell cover 12, and then the pole component 2 connected to the conductive portion 36 is covered in the mounting hole 112 from the outside of the shell cover 12; then the shell body 11 is turned over so that the shell cover 12 is located above the shell body 11 and the pole component 2 is located on the top of the shell cover 12, and the adapter structure 22 is welded and fixed to the shell cover 12.

[0474] In addition, in the embodiment of the present application, since the connection between the cell component 3 and the pole component 2 is completed first, and then the pole component 2 and the shell component 1 are assembled and connected, rather than pre-installing the pole component and the shell component first and then connecting the cell component to the pole component, this is conducive to shortening the length of the conductive portion 36 connecting the pole component 2 and the cell component 3, reducing the redundancy of the conductive portion 36 in the shell component 1, and reducing the space occupied by the conductive portion 36 in the shell component 1, which is conducive to improving the energy density of the battery cell 102. It is also conducive to reducing the risk of the conductive portion 36 being inserted upside down into the cell body 32 of the cell component 3 and causing a short circuit, thereby improving the reliability of the battery cell 102. In addition, this assembly method can achieve the assembly of the battery cell 102 regardless of whether the pole component 2 is set on the shell body 11 or the shell cover 12, so the installation position of the pole component 2 on the shell component 1 can be flexibly selected. When the pole component 2 is disposed on the shell body 11 , it is beneficial to reduce the cracking problem at the connection between the shell body 11 and the shell cover 12 , thereby improving the reliability of the battery cell 102 .

[0475] When the end wall of the housing 11 opposite to the opening 113 serves as the first housing wall 111 , if the pole component is first installed on the first housing wall and then the core component is installed into the housing, it is difficult to connect the core component and the pole component. In the embodiment of the present application, by first connecting the cell component 3 to the pole component 2 and then connecting the pole component 2 to the shell component 1, the connection requirements of the cell component 3 to the pole component 2 and the connection requirements of the pole component 2 to the shell component 1 can be met; when the battery 100 vibrates or deforms, the pole components 2 connected by the busbar component will be pulled against each other. Since the pole component 2 is arranged on the first shell wall 111 of the shell body 11 opposite to the opening 113, the force acting on the pole component 2 will be preferentially transmitted to the shell body 11, and will not directly act on the shell cover 12. Therefore, not only can the distance for the force to be transmitted to the connection between the shell body 11 and the shell cover 12 (such as the weld) be extended, but the shell body 11 will preferentially deform when subjected to force, so as to reduce the force at the connection between the shell body 11 and the shell cover 12, thereby effectively reducing the probability of cracking at the connection between the shell cover 12 and the shell body 11 during use of the battery 100, thereby improving the reliability of the battery cell 102. Furthermore, since the connection between the shell body 11 and the shell cover 12 is not prone to cracking, there is no need to increase the wall thickness of the shell body 11 and the shell cover 12 in order to increase the reliability of the connection between the two, which is beneficial to reducing weight and material costs.

[0476] When the shell cover 12 serves as the first shell wall 111, if the pole component is first installed on the shell cover and then the pole component and the battery cell component are connected, when connecting the pole component and the battery cell component, the length of the conductive part needs to be set relatively long (for example, greater than half the width of the shell cover) so that the battery cell component can be located on one side in the width direction of the shell cover. In this way, the length of the conductive part is longer, and the redundancy of the conductive part is greater after assembly, which easily leads to the risk of reverse insertion into the active material coating part and causing a short circuit. In the embodiment of the present application, the pole component 2 and the battery cell component 3 are first connected, and then the pole component 2 is installed on the shell cover 12. Therefore, when the pole component 2 and the battery cell component 3 are connected, the length of the conductive part 36 is such that the battery cell component 3 can be located on one side in the width direction of the pole component 2, thereby shortening the length of the conductive part 36 (for example, greater than half the width of the pole component 2), reducing the redundancy of the conductive part 36 after assembly, reducing the risk of the conductive part 36 being inserted upside down into the battery cell body 32 and causing a short circuit, thereby improving the reliability of the battery cell 102 and reducing the material and cost of the conductive part 36.

[0477] It can be seen that the above-mentioned arrangement of the embodiment of the present application makes the assembly position of the pole component 2 on the shell component 1 unrestricted. The pole component 2 can be set on the shell body 11 or on the shell cover 12. The installation position of the pole component 2 on the shell component 1 can be flexibly selected, which is conducive to meeting the production requirements of different types of battery cells 102. Among them, when the pole component 2 is set on the shell body 11, it is conducive to improving the cracking problem at the connection between the shell body 11 and the shell cover 12, and improving the reliability of the battery cell 102. Among them, when the pole component 2 is set on the shell cover 12, it is conducive to shortening the length of the conductive portion 36, reducing the redundancy of the conductive portion 36 after assembly, reducing the risk of upside-down insertion, and improving the reliability of the battery cell...

Claims

1. A battery cell, characterized in that: include: The housing component has an accommodating cavity and includes a first housing wall that participates in defining the accommodating cavity; A pole component, mounted on the first shell wall, and comprising a pole body; A battery cell component, comprising m groups of battery cell groups arranged sequentially along a first direction, the battery cell groups comprising n battery cell bodies, the n battery cell bodies being arranged in the accommodating cavity and sequentially along the first direction, the ends of each battery cell body being connected to a tab group, all the tab groups of the same polarity of the battery cell group extending toward a middle position of the battery cell group in the first direction and connected to form a tab portion, the tab portion being electrically connected to the pole body, m ≥ 2, n ≥ 2, and m and n being positive integers; The battery cell component further includes an adapter, the pole ear portion is electrically connected to the pole body through the adapter, the adapter includes a main structure and a plurality of branch structures, the main structure is connected to the pole body, each branch structure is connected to an end of the main structure away from the pole body, and includes at least one level of branch segments, so that the adapter is constructed into a fractal tree structure, each last level of the branch segment of the branch structure is connected to one pole ear portion, the connection position between the main structure and the branch structure is located at the middle position of the m group of battery cells in the first direction, in the first direction, the midpoint of the battery cell group in the first direction is the midpoint of the middle position, and the size of the middle position is less than or equal to 1 / 2 of the size of one battery cell body; The adapter comprises a first connecting portion, a bent portion, and a second connecting portion, the first connecting portion and the second connecting portion being opposite to each other, the bent portion being bent and connected between the first connecting portion and the second connecting portion, at least a portion of the second connecting portion being configured as a plurality of branch structures, an orthographic projection of at least a portion of the pole ear portion on the first shell wall being located within the orthographic projection range of the second connecting portion on the first shell wall, and a thickness of the second connecting portion being greater than or equal to a thickness of the pole ear portion; The thickness of the bent portion is smaller than the thickness of at least one of the first connecting portion and the second connecting portion; and / or, In an extending direction of a central axis of the bending portion, a width of the bending portion is smaller than a width of at least one of the first connecting portion and the second connecting portion.

2. The battery cell according to claim 1, wherein: The number of the battery cell bodies in at least one of the battery cell groups is an odd number; and / or, The number of the battery cell bodies in at least one of the battery cell groups is an even number.

3. The battery cell according to claim 1, wherein: The numbers of the battery cell bodies in the multiple battery cell groups are equal or different.

4. The battery cell according to claim 1, wherein: The extension length of the adapter is L1, L1>b+λ / 2, b is the extension length of the portion of the adapter connected to the pole ear portion, the pole body has a welding surface, a portion of the welding surface is welded to the adapter, and λ is the size of the welding surface in the first direction.

5. The battery cell according to claim 4, characterized in that L1≥b+λ / 2+W / 2, where W is the dimension of the pole component in the first direction.

6. The battery cell according to claim 1, characterized in that All the tab groups of the battery cell group, or the conductive parts formed after the tab parts are connected to the adapter, are bent to form an open groove; or, All the tab groups of the battery cell group, or the conductive parts formed after the tab parts are connected to the adapter, are bent to form multiple open grooves. The multiple open grooves are arranged in sequence from the battery cell body toward the pole column component, and the opening directions of two adjacent open grooves are arranged at an angle.

7. The battery cell according to claim 1, characterized in that One end of the adapter away from the pole body has a clamping structure, and the clamping structure includes two clamping parts arranged opposite to each other. The pole ear is clamped between the two clamping parts and connected to each of the clamping parts.

8. The battery cell according to claim 1, wherein: The first connection portion is connected to the pole body, and the second connection portion is connected to the pole lug portion.

9. The battery cell according to claim 1, characterized in that The adapter includes a plurality of adapter foils, which are stacked and partially connected to form the first connecting portion and the second connecting portion that are spaced apart. The first connecting portion is connected to the pole body, and the second connecting portion is connected to the pole ear.

10. The battery cell according to claim 9, characterized in that The plurality of transition foils include at least one first transition foil and at least one second transition foil, wherein the first transition foil and the second transition foil are respectively connected to two sides of the thickness of the electrode tab portion.

11. The battery cell according to claim 1, characterized in that All the tab groups of the battery cell group are gathered and bent to form open slots, the first connecting portion is connected to the pole column component, and the second connecting portion extends into one of the open slots and is connected to the tab portion to support the tab portion.

12. The battery cell according to claim 11, characterized in that All the same polarity tab groups of the battery cell group converge near the battery cell body to form a gathered portion, one end of the gathered portion is bent and connected to the tab portion, and the other end is connected to the battery cell body, and the end surface of the portion where the second connection portion is connected to the tab portion extends to a position close to the bend of the gathered portion.

13. The battery cell according to claim 3, characterized in that Also includes: An insulating component is provided in the accommodating cavity and is formed with a through hole. The insulating component blocks the portion of the tab group and / or adapter that passes through the through hole to the side of the insulating component away from the battery cell body and the battery cell body.

14. The battery cell according to claim 13, characterized in that The insulating component comprises: An insulating film completely covers the battery cell body, the through hole is formed at a position of the insulating film opposite to the first shell wall, and the portion of the insulating film surrounding the through hole blocks the portion of the tab group that passes through the through hole to the side of the insulating film facing the pole body and the battery cell body.

15. The battery cell according to claim 13, characterized in that The insulating component comprises: An insulating bracket is provided on the side of the battery cell body facing the first shell wall, the through hole is formed at a position of the insulating bracket opposite to the pole component, and a portion of the insulating bracket surrounding the through hole is blocked between the adapter and the battery cell body.

16. The battery cell according to claim 3, characterized in that The pole component forms a receiving groove that is recessed relative to the first shell wall in a direction away from the battery core component and open in a direction toward the battery core component. At least a portion of the adapter is received in the receiving groove.

17. The battery cell according to any one of claims 1 to 16, characterized in that: The pole component further includes a transition structure and an insulating structure. The transition structure surrounds the pole body and is connected to the first shell wall. The insulating structure is insulated and fitted between the transition structure and the pole body.

18. The battery cell according to claim 17, characterized in that The insulating structure includes a sealing structure, which is arranged around the peripheral side of the transition structure facing the pole body and is at least partially clamped between the transition structure and the pole body in the inner and outer directions of the first shell wall.

19. The battery cell according to claim 18, characterized in that The pole body includes a peripheral portion, the transition structure is clamped on both sides of the peripheral portion in the inner and outer directions of the first shell wall by the insulating structure, and the sealing structure is clamped between the side of the peripheral portion facing the battery core component and the transition structure.

20. The battery cell according to claim 18, characterized in that The transition structure includes a mating ring portion, the pole body includes a penetration portion passing through the mating ring portion, and an inner limiting portion and an outer limiting portion connected to the penetration portion and clamped on both sides of the mating ring portion, and at least a portion of the sealing structure is clamped between the mating ring portion and the transition structure.

21. The battery cell according to claim 1, characterized in that The housing component includes a housing body and a housing cover, wherein the housing body is an integral piece and has one end open, and the housing cover is provided at the open end of the housing body. The end of the shell body opposite to the shell cover is the first shell wall; Alternatively, the shell cover is the first shell wall.

22. The battery cell according to claim 1, characterized in that Also includes: The pressure relief component is provided on the housing component and is located on the same side or on the opposite side as the pole component.

23. A processing method, characterized in that: The processing method is used for processing the battery monomer according to any one of claims 1 to 22, and the processing method comprises: Extending all the tab groups of the battery cell group toward the middle position of the battery cell group in the first direction; The battery core component is installed in the accommodating cavity, and one end of the battery core component provided with the tab group is arranged on the inner side of the first shell wall and opposite to the first shell wall; The pole component is mounted on the first housing wall, and all the tab groups are connected to the pole body.

24. The processing method according to claim 23, characterized in that: The first shell wall is formed with a mounting hole, one end of the battery core component is connected to a conductive part, and the conductive part includes the pole ear part, or includes the pole ear part and a connecting piece; The steps of installing the pole component on the first shell wall and connecting all the tab groups to the pole body include: Passing one end of the conductive portion away from the battery cell body through the mounting hole to the outside of the first shell wall and connecting it to the electrode body; The pole component connected to the conductive portion is covered on the mounting hole from the inner side or the outer side of the first shell wall; or, The steps of installing the pole component on the first shell wall and connecting all the tab groups to the pole body include: Placing the battery core component on the inner side of the first shell wall, and connecting the end of the conductive portion away from the battery core body to the terminal body; The pole component connected with the conductive portion is passed through the mounting hole and then covered on the mounting hole from the inner side or the outer side of the first shell wall.

25. The processing method according to claim 24, characterized in that: In the step of covering the mounting hole with the pole component connected to the conductive portion from the inner side or the outer side of the first shell wall, or passing the pole component connected to the conductive portion through the mounting hole and then covering the mounting hole from the inner side or the outer side of the first shell wall: When the pole component is mounted on the first shell wall, a portion of the conductive portion located between the first shell wall and the battery cell body is bent.

26. The processing method according to claim 25, characterized in that: The battery cell includes an insulating bracket located inside the first shell wall; When the pole component is mounted on the first shell wall, the step of making the portion of the conductive portion located between the first shell wall and the battery cell body bend includes: When the pole component is mounted on the first shell wall, the portion of the conductive portion located between the first shell wall and the battery cell body is bent to form at least one open groove; A portion of the insulating support is inserted into at least one of the opening slots.

27. The processing method according to claim 26, characterized in that: The conductive portion includes at least one of the pole ear portion and a transition piece, When the pole component is mounted on the first shell wall, the step of making the portion of the conductive portion located between the first shell wall and the battery cell body bend specifically includes: When the pole component is mounted on the first shell wall, after the tab group and the adapter are connected, the tab group is bent to form a first opening groove, and the adapter is bent to form a second opening groove adjacent to the first opening groove and located on a side of the first opening groove facing the pole body, and the opening directions of the second opening groove and the first opening groove are arranged at an angle; A portion of the insulating support is inserted into at least one of the first opening groove and the second opening groove.

28. The processing method according to any one of claims 25 to 27, characterized in that: The step of connecting the end of the conductive portion away from the battery cell body to the electrode body includes: Adjust the angle of the pole component so that the normal direction of the inner end surface of the pole body is close to the stacking direction of the multiple battery cell bodies. The step of placing the pole component connected to the conductive portion on the mounting hole includes: The angle of the pole component is adjusted outside the first shell wall so that the normal direction of the inner end surface of the pole body is close to perpendicular to the stacking direction of the multiple battery cell bodies, and the conductive part is bent to form at least one open groove.

29. The processing method according to claim 28, characterized in that: One end of the battery cell body is connected to a conductive part, and the conductive part includes the tab group and the adapter. When the pole component is mounted on the first shell wall, the tab group is connected to the adapter so that the tab group is bent to form a first open slot, and the adapter extends into the first open slot.

30. The processing method according to claim 29, characterized in that: When the pole component is installed on the first shell wall, the adapter is bent to form a second opening groove adjacent to the first opening groove and located on the side of the first opening groove facing the pole body. The openings of the second opening groove and the first opening groove are arranged at an angle, and at least a portion of the groove wall of the second opening groove on the side facing the battery cell body extends into the first opening groove.

31. The processing method according to claim 23, characterized in that: One end of the battery cell body is connected to a conductive part, the conductive part includes the tab group and the adapter, and the tab group includes a plurality of tab sheets; The step of extending all the tab groups of the battery cell group toward a middle position of the battery cell group in the first direction includes: Converging the plurality of tabs toward the middle position to form a lamination portion at the free end; The laminated portion is connected to the adapter.

32. The processing method according to claim 31, characterized in that: The step of connecting the laminate portion to the adapter comprises: Connecting the plurality of tab sheets of the tab group at the stacking portion to form a tab portion, and connecting at least a portion of the tab portion to the adapter; or At least a portion of the laminated portion is directly connected to the adapter.

33. The processing method according to claim 31, characterized in that: The end of the adapter away from the pole body has a clamping structure, and includes two clamping parts arranged opposite to each other; The step of connecting the laminate portion to the adapter comprises: clamping the free end with the two clamping parts from both sides of the free end; Both of the clamping parts are connected to the free end.

34. The processing method according to claim 31, characterized in that: The adapter includes a plurality of adapter foils; Before connecting the laminated portion to the adapter, the method further includes: stacking a plurality of the transfer foils; connecting partial regions of the stack to form a first connection portion; The step of connecting the laminate portion to the adapter comprises: connecting a stacked partial area of ​​a plurality of the transition foils to the free end so that the stacked partial area forms a second connection portion spaced apart from the first connection portion; The first connecting portion is connected to the pole body.

35. The processing method according to claim 23, characterized in that: The housing component includes a housing body and a housing cover, wherein the housing body has an opening; When the end wall of the shell body opposite to the opening is the first shell wall, the steps of loading the battery core component into the accommodating cavity and arranging the battery core component on the inner side of the first shell wall and opposite to the first shell wall include: Installing the battery core component into the accommodating cavity through the opening; Extend the tab group from the mounting hole so that one end of the battery core component where the tab group is located is located inside the first shell wall and opposite to the first shell wall; closing the shell cover on the opening; When the shell cover is the first shell wall, the steps of placing the battery core component into the accommodating cavity and arranging one end of the battery core component where the tab group is arranged on the inner side of the first shell wall and opposite to the first shell wall include: supporting the battery core component on the inner side of the shell cover; Extend the tab group from the mounting hole so that one end of the battery core component where the tab group is located is located inside the first shell wall and opposite to the first shell wall; The shell body is sleeved on the outer side of the battery core component and connected to the shell cover.

36. The processing method according to claim 35, characterized in that: When the end wall of the shell body opposite to the opening is the first shell wall, before the battery core component is loaded into the accommodating cavity through the opening, the method further includes wrapping an insulating film around the outer side of the battery core body; When the shell cover is the first shell wall, before the shell body is sleeved on the outer side of the battery core component, the method further includes wrapping an insulating film on the outer side of the battery core body.

37. A battery, characterized in that: The invention comprises a battery cell according to any one of claims 1 to 22.

38. The battery according to claim 37, characterized in that The battery includes a box body, the battery cells are multiple and accommodated in the box body, the bottom of the box body is the box body bottom plate, and the pole component is arranged on the side of the shell component facing the box body bottom plate, or on the side of the shell component away from the box body bottom plate.

39. An electrical device, characterized in that: Comprising a battery according to claim 37 or 38.

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