Battery device, battery cell and electric device

Abstract

The invention discloses a battery device, a battery monomer and a power utilization device, the battery device comprises a plurality of battery monomers and an electric connection column, the plurality of battery monomers are arranged along a first direction, and each battery monomer is provided with a pole column part; in the first direction, the electric connecting columns are respectively inserted into the pole parts of the two adjacent battery monomers to electrically connect the two adjacent battery monomers, and a connecting mode that a copper bar is welded with the pole parts of the adjacent battery monomers to realize electric connection of the battery monomers is replaced, so that the defects of insufficient soldering, hole blasting and the like are overcome, and the service life of the battery is prolonged. The reliability of electric connection between the battery monomers is improved; besides, the pole parts of the adjacent battery monomers are connected through the electric connecting columns, so that the shape of each pole part can be unified and standardized, the manufacturing efficiency of the pole parts is ensured, the distance between the adjacent battery monomers can be conveniently adjusted through the middle electric connecting columns, the expansion of the battery monomers is adapted, and the reliability of electric connection between the battery monomers is further improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery device, a battery cell, and an electrical device. Background Technology

[0002] In related technologies, battery devices include multiple battery cells, with electrical connections between the two terminals of two battery cells via a contact plate. During use, battery devices are often subjected to vibration and impact. In such cases, the contact plate can pull on the solder joints between the contact plate and the terminals, leading to a decrease in the reliability of the battery cells. Summary of the Invention

[0003] In view of the above problems, this application provides a battery device, a battery cell, and an electrical device that can improve the reliability of the connection between battery cells.

[0004] In a first aspect, this application provides a battery device, which includes a plurality of battery cells and electrical connection posts, wherein the plurality of battery cells are arranged along a first direction and each battery cell has an electrode portion; in the first direction, the electrical connection posts are respectively inserted into the electrode portions of two adjacent battery cells to electrically connect the two adjacent battery cells.

[0005] In the embodiments of this application, on the one hand, the electrical connection between two battery cells is achieved by inserting two battery cells into electrical connection posts respectively, replacing the connection method of welding copper bars to the terminal parts of adjacent battery cells. This improves the defects such as incomplete welds and bursts caused by welding copper bars to the terminal parts, thereby improving the reliability of the electrical connection between battery cells. On the other hand, connecting the terminal parts of adjacent battery cells with electrical connection posts, compared with directly inserting the terminal parts of adjacent battery cells into each other, not only standardizes the shape of each terminal part to ensure the manufacturing efficiency of the terminal parts, but also facilitates the adjustment of the distance between adjacent battery cells through the intermediate electrical connection posts to accommodate the expansion of battery cells, further improving the reliability of the electrical connection between battery cells. In addition, using electrical connection posts to insert the terminal parts to form the electronic path of the battery device reduces the welding of battery cell terminals, making the battery cells detachable and replaceable, and improving maintainability.

[0006] In some embodiments, the pole portion has a first insertion groove, the electrical connection post has a first insertion portion, and at least a portion of the first insertion portion is inserted into the first insertion groove to electrically connect and engage with the first insertion groove.

[0007] In the embodiments of this application, the electrical connection between the electrode post and the electrical connection post is achieved by inserting the first insertion part into the first insertion slot. This method is relatively simple to operate and provides a relatively stable connection. Furthermore, the two battery cells that have completed the electrical connection can eliminate the need for welding, thereby avoiding the problem of easy damage to the electrode assembly when disassembling the welded position of the electrode post.

[0008] In some embodiments, the terminal post protrudes from the surface of the battery cell, and the protruding portion of the terminal post forms a first insertion groove that is recessed toward the interior of the battery cell. In other embodiments, the first insertion groove is recessed into the interior of the battery cell from the surface of the battery cell.

[0009] In the embodiments of this application, the terminal portion protrudes from the surface of the battery cell, thereby reducing the impact of damage to the terminal portion on the internal structure of the battery cell, such as the electrode assembly. Furthermore, molding and assembly are facilitated when the terminal portion and the battery cell are formed separately.

[0010] Similarly, the first insertion groove is recessed from the surface of the battery cell into the inside of the battery cell, so that the electrical connection post is directly inserted into the inner side of the surface of the battery cell. The electrode post is not easily deformed under collision, squeezing, pulling and other conditions, and the insertion structure of the first insertion groove and the electrical connection post is relatively stable.

[0011] In some embodiments, both poles that are directly electrically connected by the electrical connection post are provided with a first insertion slot; both sides of the electrical connection post along the first direction are provided with a first insertion portion; and the two sides of the electrical connection post along the first direction are respectively inserted into the first insertion slots at corresponding positions on both sides.

[0012] In the embodiments of this application, the two electrode portions directly connected by the electrical connection post are each formed with a first insertion groove. The electrical connection post is formed with a first insertion portion on both sides along the first direction. The electrical connection post is inserted into the first insertion groove at the corresponding position on both sides along the first direction, so that multiple battery cells are sequentially connected in the first direction by inserting into the electrical connection post. The connection reliability is high, and it is convenient to disassemble and maintain.

[0013] In some embodiments, the electrical connection post includes a body portion and connecting portions connected to both sides of the body portion, with each of the two connecting portions forming a first insertion portion.

[0014] In the embodiments of this application, the electrical connection post includes a body portion and connecting portions connected to both sides of the body portion. Each of the two connecting portions forms a first insertion portion. Thus, when the first insertion portions on both sides of the electrical connection post are respectively inserted into the terminal portions of two battery cells, the body portion increases the strength of the electrical connection post itself and improves the mechanical properties of the insertion structure, such as resistance to pressure, tension, impact, extrusion, and wear.

[0015] In some embodiments, at least one of the first insertion groove and the first insertion portion is provided with an elastic member, which elastically abuts against the groove wall of the first insertion groove and the outer periphery of the first insertion portion to prevent the first insertion portion from disengaging from the first insertion groove.

[0016] In the embodiments of this application, the elastic member elastically abuts against the groove wall of the first insertion groove and the outer periphery of the first insertion part, preventing the first insertion part from disengaging from the first insertion groove. Thus, the elastic member can maintain full contact between the electrical connection post and the electrode post under static and dynamic conditions such as vibration and impact, thereby improving the reliability of the electrical connection between battery cells.

[0017] In some embodiments, the line connecting the two pole sections is a first direction, the elastic element is arched in a second direction, and the second direction forms an angle with the first direction.

[0018] In the embodiments of this application, the line connecting the two pole portions is a first direction, and the elastic member is arched in a second direction, with the second direction forming an angle with the first direction. This causes the elastic member to be compressed and deformed in the arched portion when the first plug portion is inserted into the first plug groove. An elastic force along the second direction is applied between the groove wall of the first plug groove and the outer periphery of the first plug portion, preventing the two pole portions from disengaging from the electrical connection post.

[0019] In some embodiments, the elastic member includes a first end and a second end fixed to the first insertion portion, and a deformable portion between the first end and the second end, the first end and the second end being opposite each other in a first direction, the deformable portion being separated from the surface of the first insertion portion and arching in a second direction, the elastic member being configured to deform near the surface of the first insertion portion during the engagement of the first insertion portion with the first insertion slot.

[0020] In the embodiments of this application, the first end and the second end are fixed to the first insertion part, and the deformable part separates from and arches relative to the first insertion part, so that the deformable part is compressed and deformed during the engagement of the first insertion part and the first insertion groove. The first end and the second end can fix the overall position of the elastic member, so that the deformable part can stably abut against the wall of the first insertion groove, preventing the first insertion part from coming out of the first insertion groove, and ensuring the reliability of the electrical connection post and the pole post.

[0021] In some embodiments, the groove wall of the first insertion slot has a limiting hole that mates with the deformable part. When the first insertion part is inserted into the first insertion slot, at least a portion of the deformable part extends into the limiting hole and abuts against the hole wall.

[0022] In the embodiments of this application, the first insertion slot has a limiting hole on its wall that mates with the deformable portion. When the first insertion part is inserted into the first insertion slot, at least a portion of the deformable portion extends into the limiting hole and abuts against the hole wall, thereby increasing the contact area when the first insertion part is inserted into the first insertion slot, and thus increasing the current-carrying area of ​​the electrical connection between the electrical connection post and the electrode post. Simultaneously, the engagement of the deformable portion with the limiting hole also improves the reliability of the insertion of the first insertion part into the first insertion slot.

[0023] In some embodiments, a flow channel is formed on the circumferential surface of the connector, and an injection hole is formed on the body portion, with the flow channel communicating with the injection hole; the battery device also includes a conductive adhesive layer, the conductive adhesive of which is injected through the injection hole and the flow channel and conductively fills the space between the first insertion slot and the first insertion portion.

[0024] In the embodiments of this application, a flow guide groove is formed on the circumferential surface of the connecting part, and an injection hole is formed in the main body. The flow guide groove is connected to the injection hole. Conductive adhesive is injected through the injection hole and the flow guide groove and conductively fills the space between the first insertion groove and the first insertion part to form a conductive adhesive layer. This conductive adhesive layer fills the cavity gap after the first insertion part and the first insertion groove are inserted, and connects the surface of the first insertion part and the groove wall of the first insertion groove, thereby increasing the current-passing contact surface between the electrical connection post and the electrode post and improving the conductivity.

[0025] In some implementations, a dispensing hole is connected to at least two flow channels located on either side of it.

[0026] In the embodiments of this application, the injection hole is connected to at least two guide grooves located on both sides, ensuring that each guide groove can be fully filled with conductive adhesive, thereby improving the injection efficiency.

[0027] In some embodiments, the electrical connection post includes a body portion and connecting portions connected to both sides of the body portion, each of the two connecting portions forming a first insertion portion; each first insertion portion is provided with a plurality of elastic elements at intervals.

[0028] In the embodiments of this application, multiple elastic elements are provided on the first insertion portions on both sides of the main body, and the multiple elastic elements are spaced apart, thereby improving the ability of the elastic elements to prevent the first insertion portion from disengaging from the first insertion slot, and thus ensuring the stability of the insertion.

[0029] In some embodiments, the line connecting the two pole pieces is a first direction, and the length extension directions of both the pole piece and the electrical connection are third directions, with the third direction forming an angle with the first direction. In other embodiments, the line connecting the two pole pieces is a first direction, the elastic element is arched in a second direction, and the length extension directions of both the pole piece and the electrical connection are third directions, with the first direction, the second direction, and the third direction being perpendicular to each other.

[0030] The direction of the line connecting the two poles, the length extension direction of the poles and the electrical connection are perpendicular to the direction of the arching of the elastic element, so that the elastic element can prevent the first plug and the first plug groove from separating to the greatest extent when it abuts against the outer periphery of the first plug and the groove wall of the first plug groove.

[0031] In some embodiments, the electrical connection post is formed with a second insertion slot, the pole portion is formed with a second insertion portion, and at least a portion of the second insertion portion is inserted into the second insertion slot to electrically connect and engage with the second insertion slot.

[0032] In the embodiments of this application, the electrical connection between the electrode post and the electrical connection post is achieved by inserting the second insertion part into the second insertion slot. This method is relatively simple to operate and provides a relatively stable connection. Furthermore, the two battery cells that have completed the electrical connection can eliminate the need for welding, thereby avoiding the problem of easy damage to the electrode assembly when disassembling the welded position of the electrode post.

[0033] In some embodiments, the terminal post protrudes from the surface of the battery cell, and the protruding portion of the terminal post forms a second insertion portion. In other embodiments, the terminal post is recessed into the battery cell from the surface of the battery cell, and the bottom wall of the recessed terminal post protrudes in a direction away from the battery cell to form a second insertion portion. The protrusion depth of the second insertion portion is less than or equal to the depth of the recess of the terminal post, and the circumferential dimension of the second insertion portion is less than the circumferential dimension of the recess of the terminal post.

[0034] The terminal post protrudes from the surface of the battery cell, thereby reducing the impact of damage to the terminal post on the internal structure of the battery cell, such as the electrode components. Furthermore, molding the terminal post separately from the battery cell facilitates fabrication and assembly.

[0035] The terminal post is recessed from the surface of the battery cell into the inside of the battery cell, so that the electrical connection post is directly inserted into the inner side of the surface of the battery cell. The second insertion part and the second insertion groove are inserted into the inner side of the surface of the battery cell, thereby reducing external interference and improving the connection reliability between the electrical connection post and the battery cell.

[0036] In some embodiments, both poles that are directly electrically connected by the electrical connection post are provided with a second plug-in portion; the electrical connection post includes a body portion, and a second plug-in groove is provided on both sides of the body portion along the first direction; the electrical connection post is plugged into the second plug-in portion at the corresponding position on both sides along the first direction.

[0037] Both terminals that are directly connected by the electrical connection post have a second insertion part. The electrical connection post has a second insertion groove on both sides along the first direction. The electrical connection post is inserted into the second insertion part at the corresponding position on both sides along the first direction. Thus, multiple battery cells are connected sequentially in the first direction by inserting into the electrical connection post. The connection reliability is high, and it is convenient to disassemble and maintain.

[0038] In some embodiments, the body portion has an injection hole that communicates with the second insertion slot.

[0039] In an embodiment of this application, the main body is formed with an injection hole, which is connected to the second insertion groove, so that conductive adhesive can flow into the second insertion groove through the injection hole and fill the cavity gap between the first insertion part and the first insertion groove after insertion.

[0040] In some embodiments, there are multiple injection holes, each of which is disposed on a surface of the body portion facing each other along a second direction. The second direction forms an angle with the first direction. The multiple injection holes are spaced apart along the length extension direction of the body portion. One injection hole is connected to one of the second insertion slots on both sides.

[0041] In the embodiments of this application, by providing a plurality of injection holes along the length extension direction of the body portion, and the injection holes communicating with at least one second insertion groove, conductive adhesive is injected through the plurality of injection holes, thereby quickly and fully filling the second insertion groove.

[0042] In some embodiments, the battery device further includes a conductive adhesive layer, the conductive adhesive of which is injected into the second insertion groove through an injection hole and conductively fills the space between the second insertion groove and the second insertion portion.

[0043] In the embodiments of this application, conductive adhesive connects the second plug portion and the groove surface of the second plug groove, thereby increasing the overcurrent contact surface between the electrical connection post and the electrode post and improving the conductivity.

[0044] In some embodiments, the width of the second connector increases along the direction of the protrusion of the second connector.

[0045] In the embodiments of this application, the width of the second plug portion increases along the direction of the second plug portion protrusion, and the second plug portion has the maximum width at the top in the protrusion direction, so that the top of the second plug portion is accommodated in the second plug groove, which can prevent the second plug portion from disengaging from the second plug groove to a certain extent.

[0046] In some embodiments, the battery device includes a limiting member disposed at at least one end along the length of the electrical connection post to prevent the second insertion portion from sliding relative to the second insertion slot.

[0047] In the embodiments of this application, the limiting member stops the second plug portion from sliding relative to the second plug groove at at least one end in the length direction of the electrical connection post, making the insertion of the second plug portion into the second plug groove more secure, thereby further improving the connection stability between the electrical connection post and the battery cell.

[0048] In some embodiments, the electrical connection post forms a limiting groove, which is located at at least one end of the second insertion groove along its length and communicates with the second insertion groove. The limiting member engages with the limiting groove and abuts against at least one end of the second insertion portion along its length.

[0049] In the embodiments of this application, the limiting member and the limiting groove are combined to abut against the second plug part, thereby preventing the second plug part from shifting or even dislodging from the second plug groove, and further improving the connection stability between the second plug part and the second plug groove.

[0050] In some embodiments, one of the two pole portions directly electrically connected by the electrical connection post has a third insertion groove, and the other has a third insertion portion. A fourth insertion portion is formed on one side of the electrical connection portion, and a fourth insertion groove is formed on the other side. At least a portion of the fourth insertion portion extends into the third insertion groove and is inserted into the third insertion groove; at least a portion of the third insertion portion extends into the fourth insertion groove and is inserted into the fourth insertion groove.

[0051] In the embodiments of this application, a recessed fourth insertion groove and a protruding fourth insertion portion are formed on both sides of the electrical connection post, so that one side of the electrical connection post accommodates the third insertion portion while the other side is inserted into the third insertion groove. This facilitates the adjustment of the distance between two adjacent battery cells to accommodate the expansion of the battery cells and further improves the reliability of the electrical connection between the battery cells.

[0052] In some embodiments, the terminal portion having the third insertion groove protrudes from the surface of the battery cell, and the protruding portion of the terminal portion has a third insertion groove recessed toward the interior of the battery cell.

[0053] In the embodiments of this application, the impact of damage to the terminal portion on the internal structure of the battery cell, such as the electrode assembly, can be reduced. Furthermore, molding and assembly are facilitated when the terminal portion and the battery cell are formed separately.

[0054] In other embodiments, the third insertion groove is recessed into the interior of the battery cell on the surface of the battery cell. In the embodiments of this application, the terminal post is not easily deformed under impact, compression, pulling, etc., and the insertion structure between the first insertion groove and the electrical connection post is relatively stable.

[0055] In some embodiments, the terminal portion having the third insertion portion protrudes from the surface of the battery cell, and the protruding portion of the terminal portion forms the third insertion portion.

[0056] In the embodiments of this application, the third connector is located on the outside of the battery cell, reducing the impact of damage to the terminal portion on the internal structure of the battery cell. Furthermore, when the terminal portion and the battery cell are molded separately, it facilitates molding and assembly.

[0057] In other embodiments, the pole portion having the third insertion portion is recessed into the battery cell on the surface of the battery cell, and the bottom wall of the recessed pole portion protrudes in the direction away from the battery cell to form the third insertion portion. The protrusion depth of the third insertion portion is less than or equal to the depth of the recess of the pole portion, and the circumferential dimension of the third insertion portion is less than the circumferential dimension of the recess of the pole portion.

[0058] In the embodiments of this application, the third insertion part and the fourth insertion groove are inserted into the inner side of the battery cell surface, thereby reducing external interference and improving the connection reliability between the electrode part and the electrical connection post.

[0059] In some embodiments, the electrical connection post includes a body portion, one side of which is connected to a fourth plug portion along a first direction, and the other side is formed with a fourth plug groove. The fourth plug portion protrudes from the surface of the body portion, and the fourth plug groove is recessed into the fourth plug portion on the surface of the body portion.

[0060] In the embodiments of this application, a fourth insertion part and a fourth insertion groove are respectively provided on both sides of the main body along the first direction. The fourth insertion part protrudes from the surface of the main body, and the fourth insertion groove is recessed into the fourth insertion part on the surface of the main body. Thus, the left and right sides of the electrical connection post are connected to the terminal post of the battery cell in different insertion or acceptance methods, which is beneficial to adjust the width between the two battery cells, adapt to the expansion of the battery cells, and thus improve the reliability of the electrical connection.

[0061] In some embodiments, the main body has a plurality of injection holes, the fourth plug portion has a guide groove, and one injection hole is connected to one of the guide groove and the fourth plug groove; the battery device also includes a conductive adhesive layer, the conductive adhesive of the conductive adhesive layer is injected into the guide groove through the injection hole and conductively fills the space between the fourth plug portion and the third plug groove, or the conductive adhesive of the conductive adhesive layer is injected into the fourth plug groove through the injection hole and conductively fills the space between the fourth plug groove and the third plug portion.

[0062] In the embodiments of this application, conductive adhesive is injected into the flow channel through the injection hole and conductively fills the space between the fourth plug and the third plug slot. Alternatively, it can be injected into the fourth plug slot through the injection hole and conductively fill the space between the fourth plug slot and the third plug, thereby ensuring good conductive contact between the fourth plug and the third plug slot, and between the fourth plug slot and the third plug, increasing the flow area and improving conductivity.

[0063] In some embodiments, the fourth plug portion is provided with a plurality of elastic members at intervals along the length extension direction of the body portion. The elastic members elastically abut against the groove wall of the third plug groove and the outer periphery of the fourth plug portion to prevent the fourth plug portion from disengaging from the third plug groove.

[0064] In the embodiments of this application, the elastic member elastically abuts against the groove wall of the third insertion groove and the outer periphery of the fourth insertion part, thereby applying an elastic force to the groove wall of the third insertion groove, preventing the fourth insertion part from disengaging from the third insertion groove, and improving the connection reliability between the electrical connection post and the pole post.

[0065] In some embodiments, the battery cell includes a housing and an electrode assembly, the electrode assembly being disposed within the housing, and the housing having mounting holes. Alternatively, the entire terminal portion may cover the mounting holes, or a portion of the terminal portion may cover the mounting holes, with a portion extending through the mounting holes into the housing to engage with the housing; the terminal portion is electrically connected to the electrode assembly.

[0066] In the embodiments of this application, the entire terminal portion is covered outside the mounting hole, which facilitates the assembly of the terminal portion and the outer casing, simplifies the manufacturing process, and improves the reliability and stability of the connection between the terminal portion and the outer casing. This makes it less likely for the terminal portion to detach from the outer casing due to vibration or external pulling during the charging and discharging process of the battery cell, and less likely to crack or be damaged due to vibration or external pulling.

[0067] In the embodiments of this application, the electrode post portion covers the outside of the mounting hole and partially extends through the mounting hole into the housing to cooperate with the housing, which is beneficial to improve the electrical connection stability and overcurrent capacity between the electrode post portion and the electrode assembly inside the housing.

[0068] In some embodiments, the housing includes a housing and an end cap, the housing having an opening and the end cap sealingly covering the opening; the pole portion is disposed on either the housing or the end cap.

[0069] In the embodiments of this application, the housing has an opening, and the end cap seals the opening; the electrode post is disposed in either the housing or the end cap, which facilitates the assembly and production of the outer shell and the electrode assembly.

[0070] In some embodiments, the battery cell has two first sidewalls facing away from each other in a first direction, two second sidewalls facing away from each other in a second direction, and two third sidewalls facing away from each other in a third direction. The first direction, the second direction, and the third direction are perpendicular to each other. The electrode portion is disposed on the first sidewall, and the area of ​​the second sidewall and the third sidewall is larger than the area of ​​the first sidewall.

[0071] In the embodiments of this application, the first sidewall is the wall with the smallest area in the cuboid, so that the expansion of the battery cell on the first sidewall is small during use, reducing the impact of the battery cell expansion on the terminal post, thereby ensuring the reliability of the electrical connection between the battery cell and the electrical connection post.

[0072] In other embodiments, the areas of the second and third sidewalls are both smaller than the area of ​​the first sidewall. In the embodiments of this application, the electrode post is disposed on the first sidewall with the largest area, which can increase the current-carrying area of ​​the battery cell electrical connection and ensure fast charging performance.

[0073] In some embodiments, the battery cell includes a housing and an electrode assembly disposed within the housing; a terminal post is disposed in the housing, and the tabs of the electrode assembly are electrically connected to the terminal post; a gap is formed between the end of the electrode assembly with the tab and the housing, and the tab is disposed within the gap; the terminal post is disposed at a position opposite to the gap in the housing.

[0074] In the embodiments of this application, the electrode post is positioned opposite the housing and the gap. When the battery cell is working, the main body of the electrode assembly expands, and the expanding main body may drive the electrode post positioned on the housing to move. If the electrode post is positioned opposite the main body, the main body may move due to expansion, simultaneously causing the electrode post to move a relatively large first displacement. By positioning the electrode post opposite the housing and the gap, even if the main body moves due to expansion, the second displacement (smaller) of the electrode post driven by the main body will be less than the first displacement, thus reducing the displacement of the electrode post and, to a certain extent, preventing the connection between the electrode post and the tab from breaking due to a large displacement of the electrode post.

[0075] In some embodiments, the battery cell includes a pressure relief mechanism disposed on one of the two second sidewalls and two third sidewalls, the pressure relief mechanism being used to rupture when the internal pressure of the battery cell exceeds a pressure threshold.

[0076] In the embodiments of this application, the pressure relief mechanism is disposed on a surface of the outer casing that is different from the first sidewall. When the internal pressure of the battery cell exceeds the threshold, the pressure relief mechanism cracks before other walls of the outer casing to release the internal pressure, thereby avoiding the risk of the first sidewall cracking when the internal pressure of the battery cell is too high, reducing the impact of excessive internal pressure of the battery cell on the terminal section, and thus reducing safety risks.

[0077] In some embodiments, the battery device includes a sampling element that directly contacts the terminal portion to collect parameter information of the corresponding battery cell.

[0078] In the embodiments of this application, the sampling element directly contacts the terminal post, improving the accuracy and synchronicity of collecting battery cell parameter information.

[0079] In some embodiments, the contact method between the sampling element and the electrode post includes at least one of the following:

[0080] The sampling element contacts at least one of the two connected pole sections in the axial direction of the pole section;

[0081] The sampling element contacts at least one of the two connected pole sections in the circumferential direction of the pole section;

[0082] The sampling element contacts at least one of the two connected pole sections in the radial direction of the pole section.

[0083] In the embodiments of this application, the sampling member can contact the pole part in at least one direction of the pole part, including the axial, circumferential and radial directions, so as to realize the electrical connection between the sampling member and the pole part. This provides a flexible sampling connection scheme for different pole part connection methods, and the arrangement of the sampling member is more flexible, which alleviates the spatial limitation on the sampling member to a certain extent.

[0084] In some embodiments, the electrical connection post includes a connection post body and a sampling part. The connection post body is inserted into the terminal portion of two adjacent battery cells respectively, and the sampling part is disposed on the connection post body to form a sampling part.

[0085] In the embodiments of this application, the sampling unit and the connecting post body are arranged by an electrical connection post, which improves the integration of components, reduces the number of parts, and is beneficial to improving assembly efficiency. At the same time, the gap between the sampling unit and the connecting post body is reduced, thereby reducing heat generation during the collection of parameter information of battery cells and preventing the sampling unit from overheating and being damaged to some extent.

[0086] In some embodiments, the sampling part is integrally formed with the connecting post body; or, the sampling part is sleeved on the outside of the connecting post body; the two sides of the sampling part respectively abut against two pole parts that are electrically connected.

[0087] In the embodiments of this application, the sampling part and the connecting post body are integrally formed, which helps to reduce or avoid the gap formed by the connection between the sampling part and the connecting post body, thereby reducing the internal resistance of the sampling part, reducing the signal loss of parameter information, and improving the accuracy of the parameter information of the battery cell.

[0088] In other embodiments, the use of a nested arrangement facilitates the assembly of the sampling unit with the connecting post body. The two sides of the sampling unit abut against the two electrode posts that are electrically connected, so that the sampling unit can collect parameter information of the corresponding two battery cells.

[0089] In some embodiments, the sampling section includes a connecting structure and a sleeve structure. The sleeve structure cooperates with the connecting structure and is sleeved on the outside of the connecting post body. The pole part includes a first pole and a second pole with opposite polarities. The two sides of the sleeve structure abut against the first pole and the second pole, respectively. The connecting structure is connected to the sampling output line.

[0090] In the embodiments of this application, the two sides of the sleeve structure abut against the first and second terminals respectively, which helps to improve the connection reliability between the sleeve structure and the first and second terminals. The parameter information of the battery cell is transmitted to the output line through the connection structure, and the output line facilitates the transmission of the battery cell parameter information to the control unit.

[0091] In some embodiments, the sleeve structure includes a sleeve plate with a second through hole, and the sleeve plate is sleeved onto the insertion part through the second through hole.

[0092] In the embodiments of this application, the two sides of the sampling unit abut against the first and second terminals respectively. The sampling unit can be connected to the first and second terminals through end-face contact, thereby enabling the sampling unit to collect parameter information of the battery cell corresponding to the first terminal and the battery cell corresponding to the second terminal. Furthermore, the sleeved arrangement facilitates the assembly of the sampling unit and the connector.

[0093] In some embodiments, there are two sleeve plates, which are spaced apart in the connecting structure. One of the two sleeve plates abuts against the second pole post, and the other of the two sleeve plates abuts against the first pole post.

[0094] In the embodiments of this application, two sleeve plates are spaced apart in the connecting structure. One sleeve plate abuts against the first pole post, and the other sleeve plate abuts against the second pole post. The abutment between the sleeve plate and the pole post ensures effective contact between the sleeve plate and the pole post to a certain extent, thereby improving the reliability of the sampling unit to a certain extent.

[0095] In some embodiments, the sleeve structure further includes an elastic pad disposed on one side of the sleeve plate. The elastic pad has a through hole adapted to the second through hole. The sleeve plate and the elastic pad are sleeved onto the insertion part through the second through hole and the through hole. The elastic pad abuts against the first pole post, and the side of the sleeve part away from the elastic pad abuts against the second pole post.

[0096] In the embodiments of this application, the elastic pad abuts against the first pole post, and the side of the sleeve portion opposite to the elastic pad abuts against the second pole post portion. Thus, the elastic pad can be positioned between the sleeve plate and the first pole post in an interference fit manner, causing the elastic pad to be in a compressed state. The elastic pad can apply pressure to the sleeve plate, which enables effective contact between the sleeve plate and the second pole post.

[0097] In some embodiments, an elastic ring is provided around the periphery of the second through hole in the sleeve plate, and the sleeve plate is sleeved on the insertion part through the elastic ring.

[0098] In the embodiments of this application, the sleeve plate is sleeved on the second pole by an elastic ring. The elastic ring can absorb a certain amount of vibration, and can maintain effective contact between the sampling element and the second pole to a certain extent when the battery cell or electrical device is vibrated and impacted.

[0099] In some embodiments, the battery device further includes a housing, a first expansion beam, and a second expansion beam; the first expansion beam and the second expansion beam are spaced apart and together with the housing form a battery compartment, and multiple battery cells are arranged sequentially in the battery compartment, with the battery cells located at the ends respectively cooperating with the first expansion beam and the second expansion beam.

[0100] In the embodiments of this application, the battery compartment is formed by the first expansion beam, the second expansion beam and the housing. Multiple battery cells are arranged sequentially in the battery compartment, and the battery cells at the ends cooperate with the first expansion beam and the second expansion beam respectively. In this way, while saving installation space and increasing energy density, the first expansion beam and the second expansion beam can provide better constraint force for the expansion of the battery cells.

[0101] In other embodiments, the battery device further includes a housing, a module housing, and a mounting beam, with multiple battery cells disposed within the module housing, which is then mounted to the housing via the mounting beam. In the embodiments of this application, the module housing provides a stable and reliable mounting space for the battery cells.

[0102] Secondly, this application provides a battery cell, which includes a housing, an electrode assembly, and a terminal post. The housing includes two opposing first sidewalls. The electrode assembly is disposed inside the housing and includes a tab disposed near the edge of the first sidewall. The terminal post is disposed near the edge of the first sidewall where the tab is located and is electrically connected to the tab. The terminal post has a protruding insertion portion relative to the first sidewall or a recessed insertion groove facing the inside of the housing. The insertion portion or the insertion groove of the terminal post is inserted into an electrical connection post so that the battery cell is electrically connected to the electrical connection post.

[0103] A single battery cell is connected to an electrical connection post by inserting into a connector or slot formed on the edge of the first sidewall. This replaces the previous method of welding copper bars to the terminals of adjacent battery cells, thus improving the reliability of the electrical connection between battery cells and reducing defects such as incomplete soldering and bursting caused by copper bar welding. Connecting the terminals of adjacent battery cells with electrical connection posts standardizes the shape of each terminal, ensuring manufacturing efficiency. It also facilitates adjusting the distance between adjacent battery cells via the central electrical connection post to accommodate cell expansion, further enhancing the reliability of the electrical connection between battery cells.

[0104] Thirdly, this application provides an electrical device that includes the battery device or battery cell in the above embodiments, the battery device or battery cell being used to provide electrical energy.

[0105] The electrical device according to the embodiments of this application has all the beneficial effects of the battery device or battery cell in the above embodiments.

[0106] In some embodiments, the electrical device is a vehicle, and the battery device includes a housing with multiple battery cells disposed within the housing; the vehicle chassis forms the top cover of the housing.

[0107] In the embodiments of this application, the vehicle chassis forms the top cover of the box, thereby saving on connecting structures and improving the structural compactness of the vehicle interior.

[0108] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0109] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0110] Figure 1 This is a schematic diagram of the vehicle structure according to some embodiments of this application;

[0111] Figure 2 This is an exploded view of the battery device according to some embodiments of this application;

[0112] Figure 3 This is an exploded structural diagram of a battery cell according to some embodiments of this application;

[0113] Figure 4 This is a schematic diagram of the combination of a battery cell and an electrical connection post in some embodiments of this application;

[0114] Figure 5 This is a schematic diagram of the battery cell and electrical connection post from a left-side view of some embodiments of this application;

[0115] Figure 6 This is a top-view structural diagram of a battery cell and an electrical connection post according to some embodiments of this application.

[0116] Figure 7 for Figure 5 An enlarged schematic diagram of part A;

[0117] Figure 8 This is a schematic diagram of the structure of a battery cell according to some embodiments of this application;

[0118] Figure 9 This is a schematic diagram of the structure of a battery cell in some embodiments of this application from a front-view perspective;

[0119] Figure 10 for Figure 9 A schematic diagram of the cross-sectional structure of a single battery cell along the BB direction;

[0120] Figure 11 This is one of the structural schematic diagrams of the electrical connection post in some embodiments of this application;

[0121] Figure 12 This is a schematic diagram of the combination of a battery cell and an electrical connection post in other embodiments of this application;

[0122] Figure 13 for Figure 12 A schematic diagram of the battery cell and electrical connection post from a top-down view;

[0123] Figure 14 This is a perspective structural diagram of a battery cell according to some embodiments of this application;

[0124] Figure 15 for Figure 14 A schematic diagram of the structure of a single battery cell from a left-hand view.

[0125] Figure 16 This is a second schematic diagram of the structure of the electrical connection post in some embodiments of this application;

[0126] Figure 17 This is a schematic diagram of the combination of a battery cell and an electrical connection post in some other embodiments of this application;

[0127] Figure 18 This is one of the partial cross-sectional schematic diagrams of a battery device according to some embodiments of this application.

[0128] Figure 19 This is a second partial cross-sectional schematic diagram of a battery device according to some embodiments of this application;

[0129] Figure 20 This is a third partial cross-sectional schematic diagram of a battery device according to some embodiments of this application;

[0130] Figure 21 This is one of the schematic diagrams of the sampling section in some embodiments of this application;

[0131] Figure 22 This is a fourth partial cross-sectional schematic diagram of a battery device according to some embodiments of this application;

[0132] Figure 23 This is a second schematic diagram of the sampling section in some embodiments of this application;

[0133] Figure 24 This is the fifth partial cross-sectional schematic diagram of a battery device according to some embodiments of this application;

[0134] Figure 25 This is a third schematic diagram of the sampling section of some embodiments of this application;

[0135] Figure 26 This is a partial cross-sectional schematic diagram of a battery device according to some embodiments of this application;

[0136] Figure 27 This is a fourth schematic diagram of the sampling section of some embodiments of this application;

[0137] Figure 28 This is a partial cross-sectional schematic diagram of a battery device according to some embodiments of this application;

[0138] Figure 29 This is the fifth schematic diagram of the sampling section in some embodiments of this application;

[0139] Figure 30 This is a schematic diagram of the structure of a battery cell according to other embodiments of this application;

[0140] Figure 31 for Figure 30 A schematic diagram of the structure of a single battery cell from a top-down view.

[0141] The reference numerals in the detailed embodiments are as follows:

[0142] 1000-Vehicle, 200-Controller, 300-Motor, 100-Battery Unit, 10-Box, 11-First Part, 12-Second Part, 13-First Expansion Beam, 14-Second Expansion Beam, 15-Battery Compartment, 16-Crossbeam, 17-Longitudinal Beam;

[0143] 20-Battery cell, 21-Terminal post, 211-First insertion slot, 2112-Slot bottom, 2113-Inner circumferential surface of slot, 2114-Limiting hole, 212-Second insertion part, 213-Third insertion slot, 214-Third insertion part, 22-Terminal post seat, 23-Elastic element, 231-First end, 232-Second end, 233-Deformable part, 24-Conductive adhesive layer, 25-Outer shell, 251-First sidewall, 252-Shell, 2521-Opening, 253-End cap, 254-Pressure relief mechanism, 255-Second sidewall, 256-Third sidewall, 257-Accommodation slot, 27-First terminal post, 28-Second terminal post;

[0144] 30-Electrical connection post, 31-First insertion part, 32-Body part, 321-Injection hole, 33-Connecting part, 331-Guide groove, 34-Second insertion groove, 35-Limiting member, 36-Limiting groove, 37-Fourth insertion part, 38-Fourth insertion groove; 39-Connecting post body, 391-Insertion part, 392-Insertion groove, 40-Sampling member, 41-Sampling part, 42-Output line, 43-Sleeve part, 432-Sleeve plate, 44-Connecting structure, 441-Sleeve structure, 442-Second through hole, 45-Elastic pad, 451-Through hole, 70-Elastic ring. Detailed Implementation

[0145] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0146] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0147] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0148] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0149] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0150] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0151] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0152] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0153] In the embodiments of this application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0154] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0155] In the embodiments of this application, a single battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator disposed between the negative and positive electrodes. During the charging and discharging process of the battery cell, active ions (e.g., lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, disposed between the positive and negative electrodes, serves to prevent short circuits between the positive and negative electrodes while allowing active ions to pass through.

[0156] In this embodiment, the battery cell may include a casing. The casing may be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. In some embodiments, the casing may be a sealed structure or a non-sealed structure. As an example, when the casing is a non-sealed structure, the casing serves to protect the electrode assembly, and a sealing bag is included between the casing and the electrode assembly. The sealing bag is used to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating component or an aluminum-plastic film. When the casing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0157] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0158] In some embodiments, the housing includes an end cap and a housing, the housing having an opening, and the end cap covering the opening. The housing may have one or more openings. The end cap may also have one or more.

[0159] In some embodiments of this application, at least one electrode terminal (pole post) is provided on the housing, and the electrode terminal is electrically connected to the electrode tab. The electrode terminal can be directly connected to the electrode tab, or it can be indirectly connected to the electrode tab through a current collector. The electrode terminal can be provided on the end cap or on the housing.

[0160] In the embodiments of this application, the battery device mentioned in the embodiments of this application may include one or more battery cells, and the multiple battery cells are connected in series, parallel or mixed through a busbar component.

[0161] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0162] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0163] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0164] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0165] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0166] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0167] In related technologies, battery packs consist of multiple battery cells, with electrical connections between two cells achieved by welding copper terminals to the terminals. However, the welding of copper terminals to terminals is prone to defects such as incomplete welds and bursts. During use, vibration and impact are common, which can cause the terminals to tear the weld lines between them, leading to reduced reliability of the battery cells.

[0168] To improve the defects caused by welding copper bars to terminals, electrical connection between adjacent battery cells can be achieved by inserting electrical connection posts into the terminals of adjacent battery cells.

[0169] Specifically, to improve the reliability of electrical connections between battery cells, this application provides a battery device including multiple battery cells and electrical connection posts. The multiple battery cells are arranged along a first direction, and each battery cell has an electrode portion. The electrical connection posts are respectively inserted into the electrode portions of two adjacent battery cells in the first direction to achieve electrical connection between adjacent battery cells. This design not only replaces the electrical connection method of welding copper bars to the electrode portions, solving defects such as incomplete soldering and bursting, but also allows the distance between adjacent battery cells to be adjusted by the electrical connection posts to accommodate the expansion of the battery cells, thereby improving the reliability of electrical connections between battery cells.

[0170] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0171] Please refer to Figure 1 , Figure 1This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is provided inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0172] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0173] Please refer to Figure 2 , Figure 2 This is an exploded view of a battery device 100 provided in some embodiments of this application. The battery device 100 includes a housing 10 and a battery cell 20, the battery cell 20 being housed within the housing 10. The housing 10 provides a battery compartment 15 for the battery cell 20, and the housing 10 can have various structures. In some embodiments, the housing 10 may include a first portion 11 (i.e., the top cover of the housing) and a second portion 12, the first portion 11 and the second portion 12 overlapping each other, together defining the battery compartment 15 for housing the battery cell 20. The second portion 12 may be a hollow structure open at one end, and the first portion 11 may be a plate-like structure, the first portion 11 covering the open side of the second portion 12, so that the first portion 11 and the second portion 12 together define the battery compartment 15; the first portion 11 and the second portion 12 may also both be hollow structures open on one side, the open side of the first portion 11 covering the open side of the second portion 12. Of course, the box 10 formed by the first part 11 and the second part 12 can be of various shapes, such as a cylinder, a cuboid, etc.

[0174] In the battery device 100, there can be multiple battery cells 20, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery device 100 can also consist of multiple battery cells 20 first connected in series, parallel, or in a mixed manner to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed manner to form a whole, which is also housed within the housing 10. The battery device 100 may also include other structures; for example, it may include a busbar (electrical connection post) for realizing the electrical connection between the multiple battery cells 20.

[0175] Please refer to Figure 3 , Figure 3 This is an exploded structural diagram of a battery cell 20 provided in some embodiments of this application. The battery cell 20 refers to the smallest unit constituting the battery device 100.

[0176] According to some embodiments of this application, refer to Figures 4-7 This application provides a battery device 100, which includes a plurality of battery cells 20 and electrical connection posts 30. The plurality of battery cells 20 are arranged along a first direction, and each battery cell 20 is provided with a terminal portion 21. In the first direction, the electrical connection posts 30 are respectively inserted into the terminal portions 21 of two adjacent battery cells 20 to electrically connect the two adjacent battery cells 20.

[0177] Optionally, in Figures 4-7 In the diagram, the first direction is the front-to-back direction, which is perpendicular to both the left-to-right and up-to-down directions. It is understood that in other embodiments, the first direction is not limited to the front-to-back direction. Figure 5 This is a schematic diagram of the battery cell and electrical connection post from a left-side view of some embodiments of this application; Figure 6 This is a top-view structural diagram of a battery cell and an electrical connection post according to some embodiments of this application. Figures 4-7 In the middle, the dashed lines indicate the perspective structure of a local area.

[0178] Specifically, the electrical connection post 30 is inserted into the terminal portion 21 of a battery cell 20 on both sides along the first direction. That is, two adjacent battery cells 20 along the first direction are inserted into both sides of the same electrical connection post 30 to achieve electrical connection between the two battery cells 20. The electrical connection post 30 and the terminal portion 21 are matched in shape and size. For example, if the terminal portion 21 is strip-shaped, the electrical connection post 30 is a strip-shaped structure that matches the size of the terminal portion 21. The electrical connection post 30 and the terminal portion can be connected by a mortise and tenon joint.

[0179] Optionally, the terminal portion 21 is disposed at the end of the battery cell 20. For example, the terminal portion 21 can be disposed at any end of the battery cell 20 in the up-down, left-right, or front-back directions as shown in the figure. The terminal portion 21 can output the positive or negative terminal of the battery cell 20. The terminal portions 21 that output the positive and negative terminals can be disposed on both sides of the battery cell 20 along the first direction. In other examples, the terminal portions 21 that output the positive and negative terminals can also be disposed on the same side surface of the battery cell 20.

[0180] For example, refer to Figure 8 and Figure 14 Two electrode portions 21 are respectively disposed on the front and rear surfaces of the battery cell 20 opposite to each other along a first direction. In this embodiment, the electrode portion 21 disposed on the front surface of the battery cell 20 can form a positive electrode or a negative electrode, and the electrode portion 21 disposed on the rear surface of the battery cell 20 has the opposite polarity to the electrode portion 21 on the front surface. Thus, combined with Figure 4 and Figure 12 Two battery cells 20 connected in series along the front-to-back direction via an electrical connection post 30 and an electrode post 21 can be connected in series.

[0181] Optionally, the terminal portion 21 is disposed on the front and rear surfaces of the battery cell 20 opposite to each other along the first direction, and the terminal portion 21 is disposed near at least one edge of the front and rear surfaces of the battery cell 20. For example, two terminal portions 21 are respectively disposed on the upper edges of the front and rear surfaces of the battery cell 20. Alternatively, the terminal portion 21 may be disposed on two or more opposite edges of the front and rear surfaces.

[0182] In other embodiments, the number of pole portions 21 may be two or more.

[0183] Optionally, the terminal portions 21 of two adjacent battery cells 20 are arranged opposite each other along the first direction. Multiple battery cells 20 are sequentially connected along the first direction via multiple electrical connection posts 30.

[0184] Optionally, the electrical connection post 30 is made of a metal material with good conductivity.

[0185] In the technical solution of this application embodiment, on the one hand, the electrical connection between two battery cells 20 is achieved by inserting two battery cells 20 into electrical connection posts 30 respectively, replacing the connection method of welding copper bars to the terminal parts 21 of adjacent battery cells 20 to achieve electrical connection between battery cells 20. This can improve the defects such as incomplete welding and bursting caused by welding copper bars to the terminal parts 21, thereby improving the reliability of the electrical connection between battery cells 20; on the other hand, connecting the terminal parts 21 of adjacent battery cells 20 through electrical connection posts 30, compared to adjacent battery cells... The direct interlocking of the terminal portions 21 of the battery cells 20 not only standardizes the shape of each terminal portion 21 to ensure manufacturing efficiency, but also facilitates adjustment of the distance between adjacent battery cells 20 via the intermediate electrical connection post 30 to accommodate the expansion of the battery cells 20, thereby further improving the reliability of the electrical connection between the battery cells 20. In addition, the use of the electrical connection post 30 to interlock with the terminal portions 21 to form the electronic path of the battery device 100 reduces the welding of the battery cell terminals 20, making the battery cells 20 detachable and replaceable, and improving maintainability.

[0186] Reference Figures 7-10 In some embodiments, the pole portion 21 is formed with a first insertion groove 211, and the electrical connection post 30 is formed with a first insertion portion 31. At least a portion of the first insertion portion 31 is inserted into the first insertion groove 211 to electrically connect and cooperate with the first insertion groove 211.

[0187] Optionally, the pole portion 21 may form a first insertion groove 211 with a cross-section of a circle, ellipse, triangle, square, polygon, racetrack shape, or other irregular shape. Optionally, the cross-sectional shape of the first insertion portion 31 is a circle, ellipse, triangle, square, polygon, racetrack shape, or other irregular shape that is adapted to the first insertion groove 211.

[0188] Optionally, the terminal post 21 extends along the length of the side of the adjacent battery cell 20, forming an elongated shape. The electrical connection post 30 is a column with a length close to that of the terminal post 21. Furthermore, both the first insertion groove 211 and the first insertion portion 31 extend along the length of the terminal post 21, forming an elongated shape. This arrangement increases the connection area, which is particularly beneficial for dispersing stress along the length of the side of the battery cell 20, ensuring the structural stability of the connection between the terminal post 21 and the electrical connection post 30.

[0189] Alternatively, the electrical connection post 30 may also be a short, thick post or other composite structure. The shape and size of the first insertion part 31 are adapted to the shape and size of the electrical connection post 30.

[0190] Optionally, the terminal portion 21 includes a terminal seat 22, and the first insertion groove 211 is recessed into the battery cell 20 relative to the terminal seat 22. Optionally, the first insertion groove 211 includes a groove bottom surface 2112 and a groove inner peripheral surface 2113, the groove bottom surface 2112 being the deepest point of the first insertion groove 211 along the recessed direction, and the groove inner peripheral surface 2113 connecting the terminal seat 22 and the groove bottom surface 2112. Further, the first insertion groove 211 is recessed along a first direction, and the groove bottom surfaces 2112 of the two first insertion grooves 211 located on the front and rear sides of the battery cell 20 are directly opposite each other along the first direction, and the groove inner peripheral surface 2113 surrounds the first insertion groove 211 along the vertical and horizontal directions.

[0191] The first plug-in portion 31 is a protruding structure adapted to the first plug-in groove 211. The first plug-in portion 31 is inserted into the first plug-in groove 211, and the top end of the first plug-in portion 31 in the first direction is accommodated in the first plug-in groove 211, and its end face can abut against the bottom surface 2112 of the groove.

[0192] In the embodiments of this application, the first insertion part 31 is inserted into the first insertion slot 211 to achieve electrical connection between the electrode post 21 and the electrical connection post 30. The operation is relatively simple and the connection is relatively stable. At the same time, the two battery cells 20 that have completed the electrical connection can eliminate the need for welding, thereby avoiding the problem of easy damage to the electrode assembly when the welding position of the electrode post 21 is removed.

[0193] In some embodiments, the terminal post 21 protrudes from the surface of the battery cell 20, and the protruding portion of the terminal post 21 forms a first insertion groove 211 that is recessed toward the interior of the battery cell 20.

[0194] Reference Figures 8-10 In other embodiments, the first insertion groove 211 is recessed into the interior of the battery cell 20 on the surface of the battery cell 20.

[0195] For ease of explanation, the inner and outer sides of the battery cell 20 are distinguished by the surface of the battery cell 20 where the terminal post 21 is located. Optionally, in some embodiments, the terminal post 21 protrudes from the surface of the battery cell 20 and is at least partially located on the outer side of the battery cell 20. The terminal post seat 22 is located on the outer side of the battery cell 20 and at a certain distance from the surface of the battery cell 20. The bottom surface 2112 of the first insertion groove 211 may be located on the inner side of the battery cell 20, and the inner peripheral surface 2113 of the first insertion groove 211 is partially located on the inner side and partially located on the outer side of the battery cell 20; the bottom surface 2112 may also be located on the outer side of the battery cell 20, in which case the entire inner peripheral surface 2113 is located on the outer side of the battery cell 20.

[0196] In the embodiments of this application, the terminal post 21 protrudes from the surface of the battery cell 20, thereby reducing the impact of damage to the terminal post 21 on the internal structure of the battery cell 20, such as the electrode assembly. Furthermore, the separate molding of the terminal post 21 and the battery cell 20 facilitates molding and assembly.

[0197] Alternatively, in other embodiments, such as Figure 10 As shown, the terminal block 22 is connected to the surface of the battery cell 20, and the bottom surface 2112 and the inner circumferential surface 2113 of the first insertion groove 211 are both located inside the battery cell 20.

[0198] In the embodiments of this application, the first insertion groove 211 is recessed from the surface of the battery cell 20 into the interior of the battery cell 20, so that the electrical connection post 30 is directly inserted into the inner side of the surface of the battery cell 20. The pole part 21 is not easily deformed under collision, squeezing, pulling and other conditions, and the insertion structure of the first insertion groove 211 and the electrical connection post 30 is relatively stable.

[0199] Reference Figures 4-7 In some embodiments, both pole portions 21 directly electrically connected by the electrical connection post 30 are formed with first insertion slots 211; the electrical connection post 30 has first insertion portions 31 formed on both sides along the first direction; the electrical connection post 30 is inserted into the first insertion slots 211 at corresponding positions on both sides along the first direction. Figures 4-7 As shown, the first direction is the front-to-back direction.

[0200] Specifically, in combination Figure 11 The electrical connection post 30 includes a front end face and a rear end face opposite each other along a first direction. The front end face is the end face of the first insertion portion 31 on the front side of the electrical connection post 30, and the rear end face is the end face of the first insertion portion 31 on the rear side of the electrical connection post 30. The front end face is accommodated in the first insertion groove 211 on the front side of the electrical connection post 30, and the rear end face is accommodated in the first insertion groove 211 on the rear side. The front end face of the first insertion portion 31 abuts against the bottom surface 2112 of the first insertion groove 211 on the front side of the electrical connection post 30, and the rear end face of the first insertion portion 31 abuts against the bottom surface 2112 of the first insertion groove 211 on the rear side of the electrical connection post 30. Thus, among the plurality of battery cells 20 arranged along the first direction, an electrical connection post 30 is inserted between every two battery cells 20, and the plurality of battery cells 20 are connected sequentially through electrical connection posts 30, which are one less than the number of battery cells 20.

[0201] The peripheral surface of the first plug slot 211 can contact the inner peripheral surface 2113 of the first plug slot 211, thereby increasing the electrical connection area and improving the current carrying capacity.

[0202] Both electrode portions 21 directly connected by the electrical connection post 30 have a first insertion slot 211. The electrical connection post 30 has a first insertion portion 31 on both sides along the first direction. The electrical connection post 30 is inserted into the first insertion slot 211 at the corresponding position on both sides along the first direction. Thus, multiple battery cells 20 are sequentially connected in the first direction by being inserted into the electrical connection post 30. The connection reliability is high, and it is convenient for disassembly and maintenance.

[0203] Reference Figure 11 In some embodiments, the electrical connection post 30 includes a body portion 32 and connection portions 33 connected to both sides of the body portion 32, with each of the two connection portions 33 forming a first insertion portion 31.

[0204] Specifically, such as Figure 11 As shown, the first direction is the front-to-back direction, and the two connecting portions 33 protrude from the end faces of the body portion 32 on both sides along the first direction. Optionally, one connecting portion 33 is provided on the front surface of the body portion 32, and the other connecting portion 33 is provided on the rear surface of the body portion 32. The end face of the connecting portion 33 away from the body portion 32 in the first direction abuts against the bottom surface 2112 of the first insertion groove 211.

[0205] Optionally, combined Figure 7 , Figure 7 The dashed line indicates the perspective structure. The connecting portion 33 can extend completely into the first insertion slot 211 in the first direction. The connecting portion 33 (i.e., the first insertion portion 31) is accommodated in the first insertion slot 211, while the body portion 32 protrudes outside the first insertion slot 211. The body portion 32 is located between the two terminal portions 21 that are inserted into the electrical connection post 30. The thickness of the body portion 32 in the first direction can be approximated as the distance between two adjacent and inserted battery cells 20 along the first direction. Optionally, the connecting portion 33 can extend partially into the first insertion slot 211 in the first direction, with the ends of the body portion 32 and the connecting portion 33 connected to the body portion 32 protruding outside the first insertion slot 211.

[0206] The main body 32 can be a cylinder, cuboid, cube, flattened body, or other irregular block. The connecting part 33 can be a cylinder, cuboid, cube, flattened body, or other irregular block.

[0207] For example, refer to Figure 11The first direction is the front-to-back direction, which is also the thickness direction of the body portion 32. The left-to-right direction is the length extension direction of the body portion 32. The body portion 32 is a long and flat columnar structure, and the cross-section of the body portion 32 along the left-to-right direction is an elongated racetrack shape. In this embodiment, the cross-section of the connecting portion 33 along the left-to-right direction can match the cross-sectional shape and size of the body portion 32. The cross-section of the connecting portion 33 can be slightly smaller than the cross-section of the body portion 32, forming a racetrack shape. The fact that the cross-sectional size of the body portion 32 is slightly larger than the cross-sectional size of the connecting portion 33 in the left-to-right direction is beneficial for increasing the current-passing area of ​​the electrical connection post 30 and reducing the current-passing impedance.

[0208] In the embodiments of this application, the electrical connection post 30 includes a body portion 32 and a connecting portion 33 connected to both sides of the body portion 32. Each of the two connecting portions 33 forms a first insertion portion 31. Thus, when the first insertion portions 31 on both sides of the electrical connection post 30 are respectively inserted into the terminal portion 21 of the two battery cells 20, the body portion 32 increases the strength of the electrical connection post 30 itself and improves the mechanical properties of the insertion structure, such as resistance to compression, tension, impact, extrusion, and wear.

[0209] Reference Figure 7 and Figure 11 In some embodiments, at least one of the first insertion groove 211 and the first insertion portion 31 is provided with an elastic member 23. The elastic member 23 elastically abuts against the groove wall of the first insertion groove 211 and the outer periphery of the first insertion portion 31 to prevent the first insertion portion 31 from disengaging from the first insertion groove 211. The groove wall of the first insertion groove 211 includes the aforementioned groove bottom surface 2112 and the groove inner peripheral surface 2113.

[0210] Optionally, the elastic element 23 is disposed on the electrical connection post 30, and at least one end of the elastic element 23 is fixedly connected to the first insertion portion 31. Further, the elastic element 23 is connected to the circumferential surface of the first insertion portion 31. When the first insertion portion 31 is inserted into the first insertion groove 211, the elastic element 23 is compressed to generate elastic deformation and provides elastic force, abutting against the inner circumferential surface 2113 of the first insertion groove 211.

[0211] Optionally, the elastic element 23 is disposed in the pole portion 21 and may be located on the bottom surface 2112 and / or the inner peripheral surface 2113 of the first insertion groove 211. For example, the elastic element 23 is only disposed on the inner peripheral surface 2113 of the first insertion groove 211. When the first connecting portion 33 is inserted into the first insertion groove 211, it is squeezed by the first insertion portion 31 and elastically abuts against the outer peripheral surface of the first insertion portion 31.

[0212] Optionally, the elastic element 23 is provided on both the first insertion groove 211 and the first insertion part 31, and the elastic element 23 on the first insertion groove 211 and the elastic element 23 on the first insertion part 31 can be misaligned.

[0213] In the embodiments of this application, the elastic member 23 is elastically held between the groove wall of the first insertion groove 211 and the outer periphery of the first insertion part 31 to prevent the first insertion part 31 from disengaging from the first insertion groove 211. Thus, the elastic member 23 can maintain full contact between the electrical connection post 30 and the electrode post 21 under static and dynamic conditions such as vibration and impact, thereby improving the reliability of the electrical connection between battery cells 20.

[0214] Reference Figure 7 and Figure 11 In some embodiments, the line connecting the two pole sections 21 is a first direction, and the elastic member 23 is arched in a second direction, with the second direction forming an angle with the first direction.

[0215] Specifically, as shown in the figure, the second direction is the vertical direction. The elastic element 23 can be disposed on the upper and / or lower surface of the first insertion portion 31. The elastic element 23 can also be disposed on the upper and lower opposite walls of the first insertion groove 211. The elastic element 23 can be arched upward or downward relative to its own wall surface. For example, the elastic element 23 is disposed on the upper and lower surfaces of the first insertion portion 31. In the relaxed state, the elastic element 23 arches upward relative to the upper surface of the first insertion portion 31 or protrudes downward relative to the lower surface of the first insertion portion 31.

[0216] It is understood that when the electrical connection post 30 is separated from the pole post 21, the height of the elastic member 23 arching in the second direction is greater than the gap width when the peripheral surface of the first plug part 31 is inserted into the groove wall of the first plug groove 211. The first plug part 31 is inserted into the first plug groove 211 in the first direction. The groove wall of the first plug groove 211 presses against the arched part of the elastic member 23 on the first plug part 31, or the outer peripheral surface of the first plug part 31 presses against the arched part of the elastic member 23 on the first plug groove 211. The elastic member 23 deforms so that the arched part is pressed down and abuts against the groove wall of the first plug groove 211 (or the outer periphery of the first plug part 31) and applies an elastic force to the abutting wall surface.

[0217] Optionally, the first direction and the second direction are perpendicular to each other, and the elastic force applied by the elastic member 23 along the second direction is used to prevent the first insertion part 31 from dislodging from the first insertion groove 211 to the greatest extent.

[0218] In the embodiments of this application, the line connecting the two pole portions 21 is a first direction, and the elastic member 23 is arched in a second direction, with the second direction forming an angle with the first direction. This causes the elastic member 23 to be compressed and deformed in the arched portion when the first insertion portion 31 is inserted into the first insertion groove 211. An elastic force along the second direction is applied between the groove wall of the first insertion groove 211 and the outer periphery of the first insertion portion 31, preventing the two pole portions 21 from disengaging from the electrical connection post 30.

[0219] Reference Figure 7and Figure 11 In some embodiments, the elastic member 23 includes a first end 231 and a second end 232 fixed to the first insertion portion 31, and a deformable portion 233 between the first end 231 and the second end 232. The first end 231 and the second end 232 are opposite each other in a first direction. The deformable portion 233 is separated from the surface of the first insertion portion 31 and arches in a second direction. The elastic member 23 is configured to deform near the surface of the first insertion portion 31 during the engagement of the first insertion portion 31 with the first insertion groove 211.

[0220] Optionally, the elastic element 23 is a strip structure, with the first end 231 and the second end 232 being the two ends along the length of the elastic element 23. The first end 231 and the second end 232 are fixed to the outer peripheral surface of the first insertion portion 31. The first end 231 can be fixed at the root where the connecting portion 33 connects to the main body 261, and the second end 232 can be fixed at the top end of the connecting portion 33 along the first direction. It can be understood that the distance between the first end 231 and the second end 232 is less than the length of the elastic element 23 in the relaxed state, and the deformable portion 233 arches relative to the outer peripheral surface of the first insertion portion 31.

[0221] Optionally, the elastic element 23 may also be a sheet-like, thin plate-like, solid or hollow spherical, hemispherical, conical, or other irregular structure with both ends fixed and the middle protruding. The elastic element 23 may be a spring, elastic band, etc.

[0222] During the insertion of the first insertion part 31 into the first insertion slot 211, the second end 232, the deformable part 233, and the first end 231 sequentially enter the first insertion slot 211. Because the gap between the wall of the first insertion slot 211 and the first insertion part 31 is small, the first insertion slot 211 presses the deformable part 233 against the circumferential surface of the first insertion part 31. The deformable part 233 deforms and generates an elastic force that resists the deformation tendency, supporting and pressing the wall of the first insertion slot 211.

[0223] In the embodiments of this application, the first end 231 and the second end 232 are fixed to the first plug-in part 31, and the deformable part 233 separates from the first plug-in part 31 and arches up, so that the deformable part 233 is compressed and deformed during the engagement of the first plug-in part 31 and the first plug-in groove 211. The first end 231 and the second end 232 can fix the overall position of the elastic member 23, so that the deformable part 233 can stably abut against the wall of the first plug-in groove 211, preventing the first plug-in part 31 from coming out of the first plug-in groove 211, and ensuring the reliability of the plug-in connection between the electrical connection post 30 and the pole post 21.

[0224] Reference Figure 7In some embodiments, the groove wall of the first insertion groove 211 has a limiting hole 2114 that mates with the deformable part 233. When the first insertion part 31 is inserted into the first insertion groove 211, at least a portion of the deformable part 233 extends into the limiting hole 2114 and abuts against the hole wall.

[0225] Optionally, the limiting hole 2114 is formed by recessing the groove wall of the first insertion groove 211 along the second direction, and the recess depth at both ends of the limiting hole 2114 in the first direction is significantly smaller than the recess depth in the middle.

[0226] Optionally, the maximum depth of the recess in the limiting hole 2114 in the first direction is less than the height of the arch of the deformable part 233 when it is disengaged from the first insertion groove 211, so that the deformable part 233 can be deformed by the pressure of the hole wall when it is inserted into the limiting hole 2114.

[0227] Optionally, multiple elastic elements 23 are spaced apart along the circumferential direction of the first insertion portion 31 on its outer peripheral surface. Correspondingly, multiple limiting holes 2114 are spaced apart on the groove wall of the first insertion groove 211 along the direction surrounding the first insertion groove 211. The number and position of the limiting holes 2114 correspond one-to-one with those of the elastic elements 23.

[0228] In the embodiments of this application, the first insertion groove 211 has a limiting hole 2114 on its groove wall that mates with the deformable part 233. When the first insertion part 31 is inserted into the first insertion groove 211, at least a portion of the deformable part 233 extends into the limiting hole 2114 and abuts against the hole wall, thereby increasing the contact area between the first insertion part 31 and the first insertion groove 211, and thus increasing the current-carrying area of ​​the electrical connection between the electrical connection post 30 and the pole post 21. At the same time, the engagement of the deformable part 233 with the limiting hole 2114 also improves the reliability of the insertion of the first insertion part 31 into the first insertion groove 211.

[0229] Reference Figure 7 and Figure 11 In some embodiments, a flow channel 331 is formed on the circumferential surface of the connecting portion 33, and an injection hole 321 is formed on the body portion 32. The flow channel 331 communicates with the injection hole 321. The battery device 100 also includes a conductive adhesive layer 24. The conductive adhesive of the conductive adhesive layer 24 is injected through the injection hole 321 and the flow channel 331 and is conductively filled between the first insertion groove 211 and the first insertion portion 31.

[0230] Specifically, guide grooves 331 are formed on both sides of the connecting portions 33 of the main body 32, and the guide grooves 331 are formed on the upper and lower surfaces of the connecting portions 33. Glue injection holes 321 are formed on the surface of the main body 32 that is exposed outside the battery cell 20 when the main body 32 is connected to the battery cell 20.

[0231] Optionally, an injection hole 321 is formed on the upper surface of the body portion 32, and the injection hole 321 extends from the upper surface of the body portion 32 to the guide grooves 331 on the front and rear sides.

[0232] It is understood that the first insertion part 31 is inserted into the first insertion slot 211, the body part 32 is located outside the first insertion slot 211, and the glue injection hole 321 is provided on the body part 32 and protrudes outside the first insertion slot 211. In the embodiments of this application, after the electrical connection post 30 is assembled with the battery cell 20, conductive glue can be injected through the glue injection hole 321 protruding outside the battery cell 20, which is convenient to operate.

[0233] Optionally, the guide groove 331 is a narrow straight groove, extending from the root of the connection between the connecting part 33 and the main body part 32 to the end face of the connecting part 33 away from the main body part 32. Optionally, the guide groove 331 may also extend along an arc or curve.

[0234] Optionally, there may be multiple guide channels 331, which are arranged at intervals along the circumference of the connecting portion 33.

[0235] In the embodiments of this application, a flow guide groove 331 is formed on the circumferential surface of the connecting part 33, and an injection hole 321 is formed in the body part 32. The flow guide groove 331 is connected to the injection hole 321. Conductive adhesive is injected through the injection hole 321 and the flow guide groove 331 and conductively fills the space between the first insertion groove 211 and the first insertion part 31 to form a conductive adhesive layer 24. The conductive adhesive layer 24 fills the cavity gap after the first insertion part 31 and the first insertion groove 211 are inserted, and connects the surface of the first insertion part 31 and the groove wall of the first insertion groove 211, thereby increasing the current contact surface between the electrical connection post 30 and the electrode post 21 and improving the conductivity.

[0236] Reference Figure 11 In some embodiments, a glue injection hole 321 is in communication with at least two flow channels 331 located on both sides thereon.

[0237] Specifically, the number of injection holes 321 is at least one, and when there is only one injection hole 321, the injection hole 321 is connected to all the guide grooves 331.

[0238] Optionally, there may be multiple injection holes 321, which may be arranged at intervals along the length of the body portion 32. Optionally, since the body portion 32 is relatively flat, the multiple injection holes 321 may be arranged in a row along the length of the body portion 32. Optionally, to reduce the flow distance of the conductive adhesive, each injection hole 321 may be aligned with and connected to one guide groove 331 on the left and right sides, respectively.

[0239] In the embodiments of this application, the injection hole 321 is connected to at least two guide grooves 331 located on both sides thereon, so as to ensure that each guide groove 331 can be fully filled with conductive adhesive and improve the injection efficiency.

[0240] Reference Figure 11 In some embodiments, the electrical connection post 30 includes a body portion 32 and a connecting portion 33 connected to both sides of the body portion 32, and each of the two connecting portions 33 forms a first insertion portion 31; each first insertion portion 31 is provided with a plurality of elastic elements 23 at intervals.

[0241] Optionally, there are multiple elastic elements 23, which are respectively disposed on the connecting portions 33 on both sides of the main body 32. On each connecting portion 33, the elastic elements 23 are arranged at intervals along the circumference of the connecting portion 33 (i.e., the first insertion portion 31).

[0242] Optionally, the guide groove 331 and the elastic member 23 are arranged alternately and at intervals along the circumference of the connecting part 33 (i.e. the first insertion part 31).

[0243] In the embodiments of this application, multiple elastic members 23 are provided on the first insertion portions 31 on both sides of the main body portion 32, and the multiple elastic members 23 are spaced apart, thereby improving the ability of the elastic members 23 to prevent the first insertion portion 31 from disengaging from the first insertion slot 211, thereby ensuring stable insertion.

[0244] In some embodiments, the line connecting the two pole posts 21 is a first direction, and the length extension directions of both the pole post 21 and the electrical connection 33 are a third direction, forming an angle with the first direction. In other embodiments, the line connecting the two pole posts 21 is a first direction, the elastic member 23 is arched in a second direction, and the length extension directions of both the pole post 21 and the electrical connection 30 are a third direction, with the first direction, the second direction, and the third direction being perpendicular to each other.

[0245] Optionally, the third direction forms an angle greater than 0° and less than 90° with the first direction.

[0246] Optionally, refer to Figure 7 and Figure 11 The first direction, the second direction, and the third direction are mutually perpendicular. The first direction is the front-to-back direction as shown in the figure, the second direction is the up-down direction as shown in the figure, and the third direction is the left-to-right direction as shown in the figure. The elastic element 23 arches upward or downward and abuts against the electrical connection post 30. Optionally, a plurality of elastic elements 23 are arranged at intervals along the third direction on the upper surface and / or lower surface of the first insertion portion 31.

[0247] In the embodiments of this application, the connecting direction of the two pole portions 21, the length extension direction of the pole portion 21 and the electrical connection portion 33 are perpendicular to each other and the arching direction of the elastic member 23, so that the elastic member 23 can prevent the first plug portion 31 from disengaging from the first plug groove 211 to the greatest extent when it abuts against the outer periphery of the first plug portion 31 and the groove wall of the first plug groove 211.

[0248] Reference Figures 12-15 In some embodiments, the electrical connection post 30 is formed with a second insertion groove 34, and the pole post 21 is formed with a second insertion portion 212. At least a portion of the second insertion portion 212 is inserted into the second insertion groove 34 to electrically connect and cooperate with the second insertion groove 34.

[0249] Optionally, the terminal portion 21 includes a terminal seat 22, and the second insertion portion 212 protrudes relative to the terminal seat 22 in a direction away from the battery cell 20. The second insertion groove 34 is a recess adapted to the second insertion portion 212, and the second insertion groove 34 is formed inwardly on the surface of the electrical connection post 30. The protruding top end of the second insertion portion 212 is accommodated in the second insertion groove 34, and its end face can abut against the recessed bottom wall of the second insertion groove 34. Optionally, the first direction is the front-rear direction, the terminal portion 21 is disposed on the front and rear sides of the battery cell 20, and the second insertion portion 212 protrudes along the first direction, and the second insertion groove 34 is recessed along the first direction.

[0250] Optionally, the pole portion 21 may form a second insertion portion 212 with a cross-section of a circle, ellipse, triangle, square, polygon, or other irregular shape. The cross-sectional shape of the second insertion groove 34 is a circle, ellipse, triangle, square, polygon, racetrack shape, or other irregular shape that is adapted to the second insertion portion 212.

[0251] Optionally, the electrical connector 30 is an elongated prism structure, the second insertion groove 34 extends along the length of the electrical connector 30 in the form of an elongated square groove, and the second insertion portion 212 forms an elongated protrusion that matches the size of the second insertion groove 34. Optionally, the second insertion groove 34 is a dovetail groove.

[0252] Alternatively, the electrical connection post 30 may also be a short, thick prism, a post with a rounded outer surface, or other composite structure. The shape and size of the second insertion slot 34 are adapted to the surface shape and size of the electrical connection post 30 facing the battery cell 20.

[0253] In the embodiments of this application, the electrical connection between the electrode post 21 and the electrical connection post 30 is achieved by inserting the second insertion part 212 into the second insertion slot 34. The operation is relatively simple and the connection is relatively stable. At the same time, the two battery cells 20 that have completed the electrical connection can eliminate the need for welding, thereby avoiding the problem of easy damage to the electrode assembly when the welding position of the electrode post 21 is removed.

[0254] In some embodiments, the terminal post 21 protrudes from the surface of the battery cell 20, and the protruding portion of the terminal post 21 forms a second insertion portion 212. In other embodiments, the terminal post 21 is recessed into the battery cell 20 from the surface of the battery cell 20, and the bottom wall of the recessed terminal post 21 protrudes in a direction away from the battery cell 20 to form a second insertion portion 212. The protrusion depth of the second insertion portion 212 is less than or equal to the recess depth of the terminal post 21, and the circumferential dimension of the second insertion portion 212 is less than the circumferential dimension of the recess of the terminal post 21.

[0255] The inner and outer sides of the battery cell 20 are distinguished by the surface of the terminal post 21. (Refer to...) Figures 12-15 In some embodiments, the terminal post 21 protrudes from the surface of the battery cell 20 or the inside of the battery cell 20 to the outside of the battery cell 20, and the portion of the terminal post 21 protruding from the surface of the battery cell 20 forms a second insertion portion 212, which is located on the outside of the battery cell 20.

[0256] In the embodiments of this application, the terminal post 21 protrudes from the surface of the battery cell 20, thereby reducing the impact of damage to the terminal post 21 on the internal structure of the battery cell 20, such as the electrode assembly. Furthermore, the separate molding of the terminal post 21 and the battery cell 20 facilitates molding and assembly.

[0257] In other embodiments, the terminal post 21 is recessed into the battery cell 20 on the surface of the battery cell 20, and the bottom wall of the recessed terminal post 21 protrudes in a direction away from the battery cell 20 to form a second insertion portion 212. The protrusion depth of the second insertion portion 212 is less than or equal to the depth of the recess in the terminal post 21. The second insertion portion 212 is located inside the battery cell 20 and is disposed in the recessed area formed by the terminal post 21. The electrical connection post 30 can be partially inserted into the recessed area of ​​the terminal post 21 and engage with the second insertion portion 212 inside the battery cell 20 to accommodate the second insertion portion 212 in the second insertion slot 34.

[0258] In the embodiments of this application, the terminal post 21 is recessed from the surface of the battery cell 20 toward the interior of the battery cell 20, so that the electrical connection post 30 is directly inserted into the inner side of the surface of the battery cell 20, and the second insertion part 212 and the second insertion groove 34 are inserted into the inner side of the surface of the battery cell 20, thereby reducing external interference and improving the connection reliability between the electrical connection post 30 and the battery cell 20.

[0259] Reference Figures 12-16In some embodiments, the two pole portions 21 directly connected by the electrical connection post 30 are each formed with a second insertion portion 212; the electrical connection post 30 includes a body portion 32, and the body portion 32 is formed with a second insertion groove 34 on both sides along the first direction; the electrical connection post 30 is inserted into the second insertion portion 212 at the corresponding positions on both sides along the first direction.

[0260] Specifically, the body portion 32 includes a front side and a rear side opposite to each other along a first direction. The front side faces a battery cell 20 located in front of the electrical connection post 30, and the rear side faces another battery cell 20 located behind the electrical connection post 30. A second insertion groove 34 is recessed into the front and rear sides of the body portion 32. Optionally, one second insertion groove 34 is formed on the front side, and another second insertion groove 34 is formed on the rear side. The opening 2521 of the second insertion groove 34 may occupy most of the area of ​​the front side (or the rear side).

[0261] A terminal portion 21 is provided on the rear surface of the battery cell 20 on the side in front of the electrical connection post 30, and a second insertion portion 212 is formed therein. The second insertion portion 212 is received in the second insertion groove 34 on the front side of the body portion 32. A terminal portion 21 is provided on the front surface of the battery cell 20 on the side behind the electrical connection post 30, and another second insertion portion 212 is formed therein. The second insertion portion 212 is received in the second insertion groove 34 on the rear side of the body portion 32. Thus, among the plurality of battery cells 20 arranged along the first direction, an electrical connection post 30 is inserted between every two battery cells 20, and the plurality of battery cells 20 are connected sequentially from front to back by electrical connection posts 30, which are one less than the number of battery cells 20.

[0262] The top end face of the second plug portion 212 can abut against the recessed bottom wall of the second plug groove 34. The outer peripheral surface of the second plug portion 212 can abut against the groove wall of the second plug groove 34 in the vertical and / or horizontal directions. In the embodiments of this application, the electrical connection area can be increased, and the current carrying capacity can be improved.

[0263] In the embodiments of this application, the two pole portions 21 directly connected by the electrical connection post 30 each have a second insertion portion 212. The electrical connection post 30 has a second insertion groove 34 on both sides along the first direction. The electrical connection post 30 is inserted into the second insertion portion 212 at the corresponding position on both sides along the first direction. Thus, multiple battery cells 20 are sequentially connected in the first direction by being inserted into the electrical connection post 30. The connection reliability is high, and it is convenient to disassemble and maintain.

[0264] Reference Figures 12-16 In some embodiments, the body portion 32 is provided with an injection hole 321, which communicates with the second insertion groove 34.

[0265] Specifically, the injection hole 321 is formed on the surface of the main body 32 exposed outside the battery cell 20 when the main body 32 is connected to the battery cell 20. The second insertion part 212 is inserted into the second insertion groove 34. The outer periphery of the second insertion part 212 and the groove wall of the second insertion groove 34 are not completely fitted together, and there is a certain cavity and / or gap. Optionally, the injection hole 321 is formed on the upper surface of the main body 32, the second insertion groove 34 is formed on the front and rear sides of the main body 32, and the injection hole 321 extends from the upper surface of the main body 32 to the guide groove 331 on the front and / or rear sides of the main body 32.

[0266] In the embodiments of this application, the body portion 32 forms an injection hole 321, which is connected to the second insertion groove 34, so that conductive adhesive can flow into the second insertion groove 34 through the injection hole 321 and fill the cavity gap after the first insertion portion 31 and the first insertion groove 211 are inserted.

[0267] Reference Figures 12-16 In some embodiments, there are multiple injection holes 321, and the multiple injection holes 321 are all provided on the surfaces of the body portion 32 opposite each other along the second direction. The second direction forms an angle with the first direction. The multiple injection holes 321 are arranged at intervals along the length extension direction of the body portion 32. One injection hole 321 is connected to one of the second insertion slots 34 on both sides.

[0268] Specifically, such as Figures 12-16 In the embodiment shown, the second direction is the up-down direction, the first direction is the front-back direction, the first direction is perpendicular to each other, and the length extension direction of the body part 32 is the left-right direction shown in the figure.

[0269] Optionally, two second insertion slots 34 are formed on the front and rear surfaces of the body portion 32, respectively, and an injection hole 321 is formed on the upper and / or lower surface of the body portion 32. The injection hole 321 may extend downward from the upper or lower surface of the body portion 32 through the upper end portion of the body portion 32 until it connects to the second insertion slot 34. Alternatively, the injection hole 321 may extend through the upper and lower surfaces of the body portion 32 and connect to the second insertion slot 34.

[0270] Optionally, the plurality of injection holes 321 can be arranged in two groups. One group of injection holes 321 is close to the front surface of the body portion 32 and communicates with the second insertion groove 34 on the front surface of the body portion 32; the other group of injection holes 321 is close to the rear surface of the body portion 32 and communicates with the second insertion groove 34 on the rear surface of the body portion 32. Optionally, each group of injection holes 321 is arranged in a row along the length direction of the body portion 32, and the two groups of injection holes 321 are arranged side by side along the first direction.

[0271] Alternatively, the plurality of injection holes 321 may also be staggered in the first direction and / or the length direction of the body portion 32.

[0272] In the embodiments of this application, by providing a plurality of injection holes 321 along the length extension direction of the body portion 32, and the injection holes 321 communicating with at least one second insertion groove 34, conductive adhesive is injected through the plurality of injection holes 321, thereby quickly and fully filling the second insertion groove 34.

[0273] In some embodiments, the battery device 100 further includes a conductive adhesive layer 24, the conductive adhesive of which is injected into the second insertion groove 34 through the injection hole 321 and conductively fills the space between the second insertion groove 34 and the second insertion portion 212.

[0274] Optionally, after the second plug-in portion 212 is inserted into or partially inserted into the second plug-in groove 34, conductive adhesive is injected through the injection hole 321. The conductive adhesive fills the cavity gap after the second plug-in portion 212 and the second plug-in groove 34 are inserted and cures to form a conductive adhesive layer 24.

[0275] In the embodiments of this application, conductive adhesive connects the groove surface of the second plug portion 212 and the second plug groove 34, thereby increasing the overcurrent contact surface between the electrical connection post 30 and the electrode post portion 21 and improving the conductivity.

[0276] Reference Figure 15 In some embodiments, the width d of the second plug portion 212 increases along the direction of the protrusion of the second plug portion 212.

[0277] Specifically, taking the front-to-back direction as the first direction, the second insertion portion 212 forms a protrusion along the first direction, moving away from the surface of the battery cell 20. The first direction is perpendicular to the vertical direction, and the width d of the second insertion portion 212 refers to the distance between the upper and lower surfaces of the second insertion portion 212. The width d of the second insertion portion 212 gradually increases from the surface of the battery cell 20 to the top end face of the second insertion portion 212 away from the battery cell 20. Along the direction of the protrusion of the second insertion portion 212 from the surface of the battery cell 20 to the top of the second insertion portion 212, the upper and lower surfaces of the second insertion portion 212 tend to move away from each other. Optionally, the spacing between the groove walls of the second insertion groove 34 in the vertical direction tends to gradually increase along the first direction from the groove opening to the bottom wall.

[0278] It is understood that the width is smallest at the root of the second plug portion 212 where the battery cell 20 is connected, and the width is largest at the top end face of the protrusion of the second plug portion 212. Optionally, the second plug portion 212 has the largest width at the position where it abuts against the bottom wall of the recess of the second plug groove 34.

[0279] Optionally, the upper and / or lower surfaces of the second insertion portion 212 form an angle with the first direction, and an angle is also formed between the upper and lower surfaces of the second insertion portion 212. Optionally, the upper and / or lower surfaces of the second insertion portion 212 can be flat surfaces, curved surfaces, or surfaces combining curves and straight lines.

[0280] In the embodiments of this application, the width of the second plug portion 212 increases along the direction of the protrusion of the second plug portion 212, and the second plug portion 212 has the maximum width at the top in the protrusion direction, so that the top of the second plug portion 212 is accommodated in the second plug groove 34, which can prevent the second plug portion 212 from disengaging from the second plug groove 34 to a certain extent.

[0281] Reference Figure 12 and Figure 16 In some embodiments, the battery device 100 includes a limiting member 35 disposed at at least one end of the electrical connection post 30 along its length, for preventing the second insertion portion 212 from sliding relative to the second insertion slot 34.

[0282] Specifically, the limiting member 35 can be a limiting block, a limiting plate, a limiting pin, etc. The limiting member 35 and the electrical connection post 30 can be separate structures, detachably connected, so that when the limiting member 35 and the electrical connection post 30 are separated, at least one end of the second insertion slot 34 is open, facilitating the insertion of the electrical connection post 30 into the pole portion 21. Alternatively, the limiting member 35 can form an integral structure with the electrical connection post 30.

[0283] Optionally, the limiting member 35 is disposed at one end of the electrical connection post 30 along its length. Optionally, the limiting member 35 is disposed at both ends of the electrical connection post 30 along its length.

[0284] In the embodiments of this application, the limiting member 35 stops the second insertion part 212 from sliding relative to the second insertion groove 34 at at least one end in the length direction of the electrical connection post 30, so that the insertion of the second insertion part 212 into the second insertion groove 34 is more secure, thereby further improving the connection stability between the electrical connection post 30 and the battery cell 20.

[0285] Reference Figure 16 In some embodiments, the electrical connection post 30 forms a limiting groove 36, which is located at at least one end of the second insertion groove 34 along its length and communicates with the second insertion groove 34. The limiting member 35 engages with the limiting groove 36 and abuts against at least one end of the second insertion portion 212 along its length.

[0286] Optionally, the limiting groove 36 forms an opening 2521 facing a side different from the surface where the second insertion groove 34 is located. The limiting member 35 is inserted into the limiting groove 36 from the opening of the limiting groove 36. The limiting groove 36 is partially accommodated at the end of the second insertion groove 34 to abut against the second insertion portion 212 inserted into the second insertion groove 34. Optionally, one end of the second insertion groove 34 in the longitudinal direction communicates with the limiting groove 36, and the other end is closed.

[0287] In the embodiments of this application, the limiting member 35 and the limiting groove 36 are engaged and abut against the second plug part 212, thereby preventing the second plug part 212 from shifting or even disengaging from the second plug groove 34, and further improving the connection stability between the second plug part 212 and the second plug groove 34.

[0288] Reference Figure 17 , Figure 7 The dashed line indicates the perspective structure. In some embodiments, one of the two pole portions 21 directly electrically connected by the electrical connection post 30 has a third insertion groove 213 and the other has a third insertion portion 214. A fourth insertion portion 37 is formed on one side of the electrical connection portion 33 and a fourth insertion groove 38 is formed on the other side. At least a portion of the fourth insertion portion 37 extends into the third insertion groove 213 and is inserted into the third insertion groove 213; at least a portion of the third insertion portion 214 extends into the fourth insertion groove 38 and is inserted into the fourth insertion groove 38.

[0289] Specifically, the electrical connection post 30 is inserted into the terminal portion 21 of a battery cell 20 on both sides along the first direction. That is, two adjacent battery cells 20 along the first direction are inserted into both sides of the same electrical connection post 30 to achieve electrical connection between the two battery cells 20. The electrical connection post 30 forms a fourth insertion portion 37 and a fourth insertion groove 38 on both sides along the first direction. The fourth insertion portion 37 can protrude relative to the side of the electrical connection post 30, and the fourth insertion groove 38 is recessed relative to the other side of the electrical connection post 30.

[0290] Optionally, in some embodiments, the first direction is a left-right direction, and two adjacent battery cells 20 along the first direction are located on the left and right sides of the electrical connection post 30, respectively. A third insertion groove 213 is formed on the right side of the battery cell 20 on the left side of the electrical connection post 30, and a fourth insertion portion 37 is formed on the left side of the electrical connection post 30. The shape and size of the fourth insertion portion 37 match the third insertion groove 213. In this embodiment, a third insertion portion 214 is formed on the left side of the battery cell 20 on the right side of the electrical connection post 30, and a fourth insertion groove 38 is formed on the right side of the electrical connection post 30. The shape and size of the fourth insertion groove 38 match the third insertion portion 214.

[0291] Optionally, each battery cell 20 is provided with a third insertion slot 213 and a third insertion part 214 on both sides of the first direction. Multiple battery cells 20 are arranged along the first direction. Electrical connection posts 30 are inserted between every two adjacent battery cells 20. The fourth insertion part 37 is inserted into the third insertion slot 213, and the fourth insertion slot 38 is inserted into the third insertion part 214, thereby realizing that multiple battery cells 20 are connected sequentially in the first direction.

[0292] In the embodiments of this application, a recessed fourth insertion groove 38 and a protruding fourth insertion portion 37 are formed on both sides of the electrical connection post 30, so that one side of the electrical connection post 30 accommodates the third insertion portion 214 and the other side is inserted into the third insertion groove 213. This facilitates the adjustment of the distance between two adjacent battery cells 20 to accommodate the expansion of the battery cells 20 and further improves the reliability of the electrical connection between the battery cells 20.

[0293] In some embodiments, the terminal portion 21 with the third insertion groove 213 protrudes from the surface of the battery cell 20, and the protruding portion of the terminal portion 21 has a third insertion groove 213 recessed toward the interior of the battery cell 20. In other embodiments, the third insertion groove 213 is recessed into the interior of the battery cell 20 from the surface of the battery cell 20.

[0294] Specifically, the inner and outer sides of the battery cell 20 are defined by the surface of the battery cell 20. In some embodiments, the terminal post 21 protrudes from the surface of the battery cell 20, and the terminal post 21 and the third insertion groove 213 are located on the outer side of the battery cell 20. The protruding top end face of the terminal post 21 forms a concave third insertion groove 213. The fourth insertion part 37 is inserted into the third insertion groove 213 and is still located on the outer side of the battery cell 20. In the embodiments of this application, the impact of damage to the terminal post 21 on the internal structure of the battery cell 20, such as the electrode assembly, can be reduced. Furthermore, when the terminal post 21 and the battery cell 20 are formed separately, it facilitates molding and assembly.

[0295] Reference Figure 17 In other embodiments, the third insertion groove 213 is recessed into the interior of the battery cell 20 on the surface of the battery cell 20. The terminal post 21 and the third insertion groove 213 are located inside the battery cell 20. The fourth insertion part 37 is inserted into the third insertion groove 213, also into the interior of the surface of the battery cell 20. In the embodiments of this application, the terminal post 21 is not easily deformed under impact, compression, pulling, etc., and the insertion structure of the first insertion groove 211 and the electrical connection post 30 is relatively stable.

[0296] In some embodiments, the terminal portion 21 with the third insertion portion 214 protrudes from the surface of the battery cell 20, and the protruding portion of the terminal portion 21 forms the third insertion portion 214. In other embodiments, the terminal portion 21 with the third insertion portion 214 is recessed into the battery cell 20 from the surface of the battery cell 20, and the bottom wall of the recessed terminal portion 21 protrudes in a direction away from the battery cell 20 to form the third insertion portion 214. The protrusion depth of the third insertion portion 214 is less than or equal to the recess depth of the terminal portion 21, and the circumferential dimension of the third insertion portion 214 is less than the circumferential dimension of the recess of the terminal portion 21.

[0297] The inner and outer sides of the battery cell 20 are distinguished by the surface of the terminal portion 21. In some embodiments, the terminal portion 21 protrudes from the surface of the battery cell 20 or from the inner side of the battery cell 20 to the outer side of the battery cell 20, and the portion of the terminal portion 21 protruding from the surface of the battery cell 20 forms a third insertion portion 214, which is located on the outer side of the battery cell 20. In the embodiments of this application, the impact of damage to the terminal portion 21 on the internal structure of the battery cell 20, such as electrode assemblies, is reduced. Furthermore, when the terminal portion 21 and the battery cell 20 are molded separately, it facilitates molding and assembly.

[0298] In other embodiments, the terminal post 21 is recessed from the surface of the battery cell 20 toward the interior of the battery cell 20, and the third insertion portion 214 is located inside the battery cell 20 and disposed in the recessed area formed by the terminal post 21. The electrical connection post 30 can be partially inserted into the recessed area of ​​the terminal post 21 and engages with the third insertion portion 214 inside the battery cell 20 to accommodate the third insertion portion 214 in the fourth insertion slot 38. In the embodiments of this application, the third insertion portion 214 and the fourth insertion slot 38 are inserted inside the surface of the battery cell 20, thereby reducing external interference and improving the connection reliability between the terminal post 21 and the electrical connection post 30.

[0299] Reference Figure 17 In some embodiments, the electrical connection post 30 includes a body portion 32, one side of which is connected to a fourth plug portion 37 along a first direction, and a fourth plug groove 38 is formed on the other side. The fourth plug portion 37 protrudes from the surface of the body portion 32, and the fourth plug groove 38 is recessed into the fourth plug portion 37 on the surface of the body portion 32.

[0300] Specifically, the fourth insertion portion 37 is fixedly connected to one side of the body portion 32 along the first direction, and the fourth insertion portion 37 protrudes from the surface of the body portion 32 along the first direction. The fourth insertion groove 38 is recessed to the other side along the first direction, and the depth of the recess of the fourth insertion groove 38 can be less than or equal to the width of the body portion 32.

[0301] Optionally, when the electrical connection post 30 is connected to the two terminal posts 21, the fourth insertion part 37 is inserted into the third insertion slot 213, the third insertion part 214 is inserted into the fourth insertion slot 38, and the body part 32 may be located on the outside of the battery cell 20.

[0302] Optionally, refer to Figure 17 The first direction is left and right. A fourth insertion slot 38 is formed on the left side of the electrical connection post 30. A third insertion part 214 is formed on the right side of the battery cell 20 on the left side. The third insertion part 214 is inserted into the fourth insertion slot 38 to realize the electrical connection between the battery cell 20 on the left side and the electrical connection post 30. A fourth insertion part 37 is formed on the right side of the electrical connection post 30. A third insertion slot 213 is formed on the left side of the battery cell 20 on the right side. The fourth insertion part 37 is inserted into the third insertion slot 213 to realize the electrical connection between the battery cell 20 on the right side and the electrical connection post 30.

[0303] In the embodiments of this application, a fourth insertion portion 37 and a fourth insertion groove 38 are respectively provided on both sides of the main body portion 32 along the first direction. The fourth insertion portion 37 protrudes from the surface of the main body portion 32, and the fourth insertion groove 38 is recessed into the surface of the main body portion 32 towards the fourth insertion portion 37. Thus, the left and right sides of the electrical connection post 30 are connected to the terminal post portion 21 of the battery cell 20 in different insertion or acceptance methods. This is beneficial for adjusting the width between the two battery cells 20, accommodating the expansion of the battery cells 20, and thereby improving the reliability of the electrical connection.

[0304] In some embodiments, the body portion 32 is formed with a plurality of injection holes 321, the fourth insertion portion 37 is formed with a guide groove 331, and one injection hole 321 is connected to one of the guide groove 331 and the fourth insertion groove 38; the battery device 100 also includes a conductive adhesive layer 24, the conductive adhesive of the conductive adhesive layer 24 is injected into the guide groove 331 through the injection holes 321 and conductively fills the space between the fourth insertion portion 37 and the third insertion groove 213, or the conductive adhesive of the conductive layer is injected into the fourth insertion groove 38 through the injection holes 321 and conductively fills the space between the fourth insertion groove 38 and the third insertion portion 214.

[0305] Specifically, the injection hole 321 is formed on the surface of the main body 32 exposed outside the battery cell 20 when the main body 32 is connected to the battery cell 20. Optionally, the injection hole 321 is formed on the upper surface of the main body 32, the fourth insertion portion 37 is formed on the right side of the electrical connection post 30, the flow guide groove 331 is formed on the upper and lower surfaces of the fourth insertion portion 37, and the fourth insertion groove 38 is formed on the left side of the electrical connection post 30. The injection hole 321 extends from the upper surface of the main body 32 to the left side of the electrical connection post 30 and communicates with the fourth insertion groove 38, or extends to the right side of the electrical connection post 30 and communicates with the flow guide groove 331. Optionally, a plurality of injection holes 321 are arranged at intervals along the length direction of the main body 32. Optionally, the number of flow guide grooves 331 is multiple.

[0306] In the embodiments of this application, conductive adhesive is injected into the guide groove 331 through the injection hole 321 and conductively fills the space between the fourth plug portion 37 and the third plug groove 213. Alternatively, it can be injected into the fourth plug groove 38 through the injection hole 321 and conductively fill the space between the fourth plug groove 38 and the third plug portion 214. This ensures good conductive contact between the fourth plug portion 37 and the third plug groove 213, and between the fourth plug groove 38 and the third plug portion 214, thereby increasing the flow area and improving conductivity.

[0307] In some embodiments, the fourth plug portion 37 is provided with a plurality of elastic members 23 at intervals along the length extension direction of the body portion 32. The elastic members 23 elastically abut against the groove wall of the third plug groove 213 and the outer periphery of the fourth plug portion 37 to prevent the fourth plug portion 37 from disengaging from the third plug groove 213.

[0308] Specifically, the elastic element 23 can be a spring, elastic block, elastic pad, etc. Optionally, the elastic element 23 is arched relative to the surface of the fourth plug-in portion 37, and the arched part of the elastic element 23 abuts against the groove wall of the third plug-in groove 213 and can generate elastic deformation in the arching direction, thereby applying an elastic force to the groove wall of the third plug-in groove 213, preventing the fourth plug-in portion 37 from disengaging from the third plug-in groove 213, and improving the connection reliability between the electrical connection post 30 and the pole post portion 21.

[0309] Reference Figure 3 In some embodiments, the battery cell includes a housing 25 and an electrode assembly 26. The electrode assembly 26 is disposed inside the housing 25. The housing 25 has a mounting hole (not shown). The terminal portion 21 is completely covered outside the mounting hole (not shown), or a portion of the terminal portion 21 is covered outside the mounting hole (not shown), and a portion of the terminal portion 21 extends through the mounting hole (not shown) into the housing 25 to engage with the housing 25. The terminal portion 21 is electrically connected to the electrode assembly 26.

[0310] Specifically, the shape of the mounting hole (not shown) can match the cross-sectional shape of the electrode post 21. For example, if the electrode post 21 is elongated, the mounting hole (not shown) can also be elongated with similar or identical dimensions. The electrode post 21 completely covers the mounting hole (not shown), thus the entire electrode post 21 is located outside the housing 25. The electrode post 21 partially extends into the mounting hole (not shown), and the portion of the electrode post 21 extending into the mounting hole (not shown) can engage with the housing 25 and connect to the electrode assembly 26.

[0311] The terminal post 21 is completely covered outside the mounting hole (not shown in the figure), which facilitates the assembly of the terminal post 21 and the outer shell 25, simplifies the manufacturing process, and improves the reliability and stability of the connection between the terminal post 21 and the outer shell 25. This makes it less likely for the terminal post 21 to detach from the outer shell 25 due to vibration or external pulling during the charging and discharging process of the battery cell 20, and also less likely to crack or be damaged due to vibration or external pulling.

[0312] The electrode post 21 partially covers the mounting hole (not shown) and extends through the mounting hole (not shown) into the housing 25 to cooperate with the housing 25, which helps to improve the electrical connection stability and overcurrent capacity between the electrode post 21 and the electrode assembly 26 inside the housing 25.

[0313] Reference Figure 3 In some embodiments, the housing 25 includes a housing 252 and an end cap 253, the housing 252 having an opening 2521, and the end cap 253 sealingly covering the opening 2521; the pole portion 21 is disposed on either the housing 252 or the end cap 253.

[0314] Specifically, the end cap 253 is a component that can close onto the opening 2521 of the housing 252 to isolate the internal environment of the battery cell 20 from the external environment. The internal environment formed by the housing 252 and the end cap 253 can accommodate the electrode assembly 26, electrolyte, and other components. The shape of the end cap 253 can be adapted to the shape of the housing 252 to fit it. For example, the housing 252 can be a cuboid, cylinder, hexagonal prism, or other shapes and sizes. Specifically, the shape of the housing 252 can be determined based on the specific shape and size of the electrode assembly 26. The material of the outer shell 25 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment does not impose any special limitations on this. Optionally, the outer shell 25 can be made of a material with a certain hardness and strength (such as aluminum alloy). This makes the outer shell 25 less prone to deformation under pressure and impact, enabling the battery cell 20 to have higher structural strength and improved safety performance.

[0315] A terminal post 21 is disposed on either the housing 252 or the end cap 253. The terminal post 21 is electrically connected to the electrode assembly 26 for outputting or inputting electrical energy from the battery cell 20. In some embodiments, an insulating member may also be disposed on the inner side of the end cap 253. The insulating member can be used to isolate the electrical connection components within the housing 252 from the end cap 253 to reduce the risk of short circuit. Exemplarily, the insulating member may be made of plastic, rubber, etc.

[0316] The housing 252 and the end cap 253 can be independent components. An opening 2521 can be provided on the housing 252, and the end cap 253 can be used to close the opening 2521 to form the internal environment of the battery cell 20. Alternatively, the end cap 253 and the housing 252 can be integrated. Specifically, the end cap 253 and the housing 252 can form a common connection surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 252, the end cap 253 can then close the housing 252.

[0317] In the embodiments of this application, the housing 252 has an opening 2521, and the end cap 253 seals the opening 2521; the electrode post 21 is disposed on either the housing 252 or the end cap 253, which facilitates the assembly and production of the outer shell 25 and the electrode assembly 26.

[0318] Reference Figures 3-4 In some embodiments, the battery cell 20 has two first sidewalls 251 facing away from each other in a first direction, two second sidewalls 255 facing away from each other in a second direction, and two third sidewalls 256 facing away from each other in a third direction. The first, second, and third directions are perpendicular to each other. The electrode post 21 is disposed on the first sidewall 251. The areas of the second sidewall 255 and the third sidewall 256 are both larger than the area of ​​the first sidewall 251. In other embodiments, the areas of the second sidewall 255 and the third sidewall 256 are both smaller than the area of ​​the first sidewall 251.

[0319] Optionally, the first direction is the front-to-back direction, the second direction is the up-and-down direction, and the third direction is the left-to-right direction. In some embodiments, the battery cell 20 is cuboid in shape, and the side lengths of the two sides of the first sidewall 251 are greater than the side length of the third side perpendicular to the first sidewall 251. The first sidewall 251 is the wall surface with the largest area in the cuboid. In the embodiments of this application, the terminal portion 21 is disposed on the first sidewall 251, which can increase the current-carrying area of ​​the battery cell 20 electrical connection and ensure fast charging performance.

[0320] Optionally, in other embodiments, the battery cell 20 is in the shape of a cuboid, and the side lengths of both sides of the first sidewall 251 are smaller than the side length of the third side perpendicular to the first sidewall 251. The first sidewall 251 is the wall with the smallest area in the cuboid, so the expansion of the battery cell 20 in the first sidewall 251 during use is small, reducing the impact of the expansion of the battery cell 20 on the terminal portion 21, thereby ensuring the reliability of the electrical connection between the battery cell 20 and the electrical connection post 30.

[0321] In some embodiments, the battery cell 20 includes a housing 25 and an electrode assembly 26 disposed within the housing 25; a terminal post 21 is disposed on the housing 25, and the tabs 262 of the electrode assembly 26 are electrically connected to the terminal post 21; a gap is formed between the end of the electrode assembly 26 where the tabs 262 are disposed and the housing 25, and the tabs 262 are disposed within the gap; the terminal post 21 is disposed at a position on the housing 25 opposite to the gap.

[0322] Optionally, please combine Figure 2 The electrode assembly 26 includes a main body 261, an electrode tab 262 disposed at the upper end of the main body 261, and an electrode post 21 disposed on the largest wall surface of the outer shell 25: the first wall surface 251. The electrode tab 262 can be directly electrically connected to the electrode post 21, or it can be connected to the electrode post 21 through an adapter piece.

[0323] Electrode assembly 26 is the component in the battery cell 20 where electrochemical reactions occur. The casing 25 may contain one or more electrode assemblies 26. Electrode assembly 26 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the body 261 of the electrode assembly 26, while the portions of the positive and negative electrode sheets without active material each constitute a tab 262. The positive and negative tabs may be located together at one end of the body 261 or separately at both ends of the body 261. During charging and discharging, the positive and negative active materials react with the electrolyte, and the tabs 262 connect to the terminals 21 to form a current loop.

[0324] The outer casing 25 has an accommodating space in which the electrode assembly 26 is housed. The end of the electrode assembly 26 with tab 262 forms a gap with the outer casing 25, that is, the end of the main body forms a gap with the casing. On the one hand, this allows the electrolyte to fully wet the electrode assembly to a certain extent. On the other hand, the gap also provides space for the tab 262 to connect with the electrode post 21 or the adapter.

[0325] The terminal post 21 is positioned opposite the housing 25 and the gap. When the battery cell 20 is operating, the main body 261 of the electrode assembly 26 expands, which may cause the terminal post 21 on the housing 25 to move. If the terminal post 21 is positioned opposite the main body 261, the expansion of the main body 261 may simultaneously cause the terminal post 21 to move by a larger initial displacement. By positioning the terminal post 21 opposite the housing 25 and the gap, even if the main body 261 moves due to expansion, the second (smaller) displacement of the terminal post 21 caused by the main body 261 will be less than the first displacement. This results in a smaller displacement of the terminal post 21, which to some extent avoids the connection between the terminal post 21 and the tab 262 being broken due to a large displacement of the terminal post 21.

[0326] In some embodiments, the battery cell 20 includes a pressure relief mechanism 254 disposed on one of the two second sidewalls 255 and the two third sidewalls 256, the pressure relief mechanism 254 being used to rupture when the internal pressure of the battery cell 20 exceeds a pressure threshold.

[0327] Please refer to Figure 3 In some embodiments, the battery cell 20 includes a pressure relief mechanism 254 disposed on a surface of the housing 25 that is different from the first sidewall 251. The pressure relief mechanism 254 is used to crack the housing 25 before the internal pressure of the battery cell 20 exceeds a pressure threshold.

[0328] Optionally, the pressure relief mechanism 254 forms a local wall thickness on the outer casing 25, other than the first sidewall 251, that is shallower than the overall wall thickness, through notches, grooves, etc. For example... Figure 3 As shown, the second sidewall 255 includes an end cap 253 located at the opening above the housing 252, and a pressure relief mechanism 254 is disposed on the end cap 253.

[0329] Optionally, the first sidewall 251 is located on the front and rear sides of the battery cell 20, and the pressure relief mechanism 254 can be located on one of the left, right, upper, or lower sides of the housing 25.

[0330] In the embodiments of this application, the pressure relief mechanism 254 is disposed on the surface of the outer casing 25 that is different from the first side wall 251. When the internal pressure of the battery cell 20 exceeds the threshold, the pressure relief mechanism 254 cracks before other walls of the outer casing 25 to release the internal pressure, thereby avoiding the risk of the first side wall 251 cracking when the internal pressure of the battery cell 20 is too high, reducing the impact of the excessive internal pressure of the battery cell 20 on the terminal portion 21, and thus reducing the safety risk.

[0331] Reference Figures 20-18 In some embodiments, the battery device 100 includes a sampling element 40 that directly contacts the terminal portion 21 to collect parameter information of the corresponding battery cell 20.

[0332] Optionally, the sampling element 40 collects parameter information of the battery cell 20 where the directly contacting terminal portion 21 is located. In another embodiment, two adjacent battery cells 20 arranged along the first direction are electrically connected by inserting two terminal portions 21. The sampling element 40 abuts against the two mutually inserted terminal portions 21 and collects parameter information of the two mutually inserted terminal portions 21.

[0333] Optionally, the sampling element 40 can be a voltage sampling structure for the battery cell 20, sampling the voltage information of the battery cell 20 by directly contacting the terminal portion 21. The sampling element 40 is a contact-type electrical connection structure.

[0334] In the embodiments of this application, the sampling element 40 directly contacts the terminal post 21, thereby improving the accuracy and synchronicity of collecting parameter information of the battery cell 20.

[0335] Reference Figures 20-18 In some embodiments, the contact method between the sampling member and the pole piece 21 includes at least one of the following:

[0336] The sampling element 40 contacts at least one of the two connected pole sections 21 in the axial direction L of the pole section 21;

[0337] The sampling element 40 contacts at least one of the two connected pole sections 21 in the circumferential direction of the pole section 21;

[0338] The sampling element 40 contacts at least one of the two connected pole sections 21 in the radial direction D of the pole section 21.

[0339] exist Figures 18 to 29 In the process, the circumferential direction of the pole post 21 is the direction surrounding the axial direction L of the pole post 21, and the radial direction D of the pole post 21 can be perpendicular to the axial direction L of the pole post 21, or the first direction can be parallel to the axial direction L of the pole post 21, or the first direction can coincide with the axial direction L of the pole post 21.

[0340] The contact method between the sampling element 40 and the pole post 21 includes at least one of the following:

[0341] The sampling element 40 contacts at least one of the two connected pole sections 21 in the axial direction L of the pole section 21 (hereinafter referred to as contact method one), such as Figure 20 As shown;

[0342] The sampling element 40 contacts at least one of the two connected pole sections 21 in the circumferential direction of the pole section 21 (hereinafter referred to as contact method two), such as Figure 18 As shown;

[0343] The sampling element 40 contacts at least one of the two connected pole sections 21 in the radial direction D of the pole section 21 (hereinafter referred to as contact mode three).

[0344] In one embodiment, the contact method between the sampling element 40 and the pole post 21 is contact method one. In contact method one, the sampling element 40 may contact one or both pole posts 21 in the axial direction L of the pole post 21. Contact method one is applicable to scenarios where the space in the circumferential and radial directions D of the pole post 21 is small, but the space in the axial direction L of the pole post 21 is large, for example, when installing the sampling element 40.

[0345] In one embodiment, the sampling element 40 contacts the pole piece 21 in a second manner. In this second manner, the sampling element 40 may contact one or both pole pieces 21 in the circumferential direction. This second manner is suitable for installing the sampling element 40 in scenarios where there is limited space in the axial direction L and radial direction D of the pole piece 21, but more space in the circumferential direction.

[0346] In one embodiment, the sampling element 40 contacts the pole piece 21 in contact mode three. In contact mode three, the sampling element 40 may contact one or both pole pieces 21 in the radial direction D. Contact mode three is applicable to scenarios where the space in the circumferential and axial directions L of the pole piece 21 is small, but the space in the radial direction D of the pole piece 21 is large.

[0347] In one embodiment, the contact method between the sampling member 40 and the pole portion 21 includes contact method one and contact method two. Optionally, the sampling member 40 may contact one of the pole portions 21 in the axial direction L and contact the other pole portion 21 in the circumferential direction. Optionally, the sampling member 40 may contact one of the pole portions 21 in both the axial direction L and the circumferential direction, and contact the other pole portion 21 in both the circumferential direction and the axial direction L. Optionally, the sampling member 40 may contact one of the pole portions 21 in the axial direction L and contact the other pole portion 21 in both the axial direction L and the circumferential direction.

[0348] In one embodiment, the contact mode between the sampling member 40 and the pole post 21 includes contact mode one and contact mode three. Optionally, the sampling member 40 may contact one of the pole posts 21 in the axial direction L and the other pole post 21 in the radial direction D. Optionally, the sampling member 40 may contact one of the pole posts 21 in both the axial direction L and the radial direction D, and the other pole post 21 in both the axial direction L and the radial direction. Optionally, the sampling member 40 may contact one of the pole posts 21 in the radial direction D and the other pole post 21 in both the axial direction L and the radial direction D.

[0349] In one embodiment, the contact method between the sampling member 40 and the pole portion 21 includes contact methods two and three. Optionally, the sampling member 40 may contact one of the pole portions 21 in the circumferential direction and the other pole portion 21 in the radial direction D. Optionally, the sampling member 40 may contact one of the pole portions 21 in both the circumferential and radial directions D, and the other pole portion 21 in both the circumferential and radial directions D. Optionally, the sampling member 40 may contact one of the pole portions 21 in the radial direction D, and the other pole portion 21 in both the circumferential and radial directions D.

[0350] In one embodiment, the contact method between the sampling element 40 and the pole piece 21 is contact method one, two, and three. For a detailed explanation of the contact method, please refer to the above explanation. To avoid redundancy, it will not be elaborated in detail here.

[0351] In the embodiments of this application, the sampling member 40 can contact the pole post 21 in at least one direction of the pole post 21, including the axial, circumferential and radial directions, so as to realize the electrical connection between the sampling member 40 and the pole post 21. This provides a flexible sampling connection scheme for different pole post 21 connection methods, and the arrangement of the sampling member 40 is more flexible, which alleviates the space restriction on the sampling member 40 to a certain extent.

[0352] Optionally, the material of the sampling element 40 may include, but is not limited to, nickel or copper. Optionally, the sampling element 40 is connected to the output line 33, which facilitates the transmission of electrical information from the battery cell 20 to the control unit, such as a voltage sampling control unit.

[0353] Please see Figures 18-29 In some embodiments, the electrical connection post 30 includes a connection post body 39 and a sampling part 41. The connection post body 39 is inserted into the terminal post 21 of two adjacent battery cells 20 respectively, and the sampling part 41 is disposed on the connection post body 39 and forms a sampling element 40.

[0354] Optional, please refer to Figure 18 Both sides of the connecting post body 39 have insertion portions 391, which protrude relative to the side of the connecting post body 39. The terminal portion 21 of the battery cell 20 has an insertion groove 392. The insertion portions 391 on both sides of the connecting post body 39 are respectively inserted into the insertion grooves 392 of two adjacent battery cells 20 to electrically connect the two adjacent battery cells 20.

[0355] Optional, please refer to Figure 19Both sides of the connecting post body 39 have insertion slots 392, and the terminal portion 21 of the battery cell 20 has an insertion portion 391, which is a protruding structure that matches the insertion slot 392. Each of two adjacent battery cells 20 has at least one insertion portion 391 that is inserted into the insertion slots 392 on both sides of the connecting post body 39 to electrically connect the two adjacent battery cells 20.

[0356] Optionally, a protruding insertion portion 391 is formed on one side of the connecting post body 39, and a concave insertion groove 392 is formed on the other side. The insertion portion 391 and the insertion groove 392 on both sides of the connecting post body 39 are respectively inserted into the terminal portion 21 of two adjacent battery cells 20.

[0357] Optionally, the connecting post body 39 is inserted into the terminal portion 21 of two adjacent battery cells 20 on both sides in the first direction, which is the front-to-back direction. The sampling part 41 can be disposed on a side other than the front and back sides of the connecting post body 39. For example, to reduce the interference of the sampling part 41 on the insertion between the connecting post body 39 and the terminal portion 21, the sampling part 41 can be disposed on the upper and / or lower side of the connecting post body 39, and can be further located at the middle position of the connecting post body 39 in the front-to-back direction.

[0358] In the embodiments of this application, the sampling part 41 and the connecting post body 39 are arranged by an electrical connection post to form a sampling component 40, which improves the integration of parts and is beneficial to improving assembly efficiency. At the same time, the internal resistance between the sampling component 40 and the terminal post 21 is reduced, thereby reducing heat generation during the collection of parameter information of the battery cell 20 and preventing the sampling part 41 from overheating and being damaged to a certain extent.

[0359] 37. In some embodiments, the sampling part 41 is integrally formed with the connecting post body 39, and the two sides of the sampling part 41 respectively abut against two poles that are electrically connected.

[0360] In the embodiments of this application, the sampling unit 41 is integrally formed with the connecting post body 39, thereby reducing the number of parts and improving assembly efficiency. Simultaneously, it reduces or avoids gaps between the sampling unit 41 and the connecting post body 39, thus reducing the loss of parameter information collected by the sampling unit 40. The two sides of the sampling unit 41 respectively abut against two electrically connected terminal posts 21, allowing the sampling unit 41 to collect parameter information corresponding to two battery cells 20.

[0361] In other embodiments, the sampling part 41 is sleeved on the outside of the connecting post body 39, and the two sides of the sampling part 41 abut against the two pole parts 21 that are electrically connected.

[0362] Optionally, please combine Figure 18 , Figures 20 to 23 , Figures 26 to 29In the figure, the first direction is the front-to-back direction. The sampling part 41 is sleeved on the outside of the connecting column body 39. The two sides of the sampling part 41 are respectively in contact with the two pole parts 21 that are electrically connected.

[0363] Specifically, the sampling part 41 is provided with a second through hole 422, and the connecting column body 39 passes through the second through hole 422, so that the sampling part 41 is sleeved on the outer side (circumferential side) of the connecting column body 39.

[0364] The two sides of the sampling unit 41 are the two end faces of the sampling unit 41 along the first direction. The two sides of the sampling unit 41 abut against the first terminal 27 and the second terminal 28 respectively. The sampling unit 41 can be connected to the first terminal 27 and the second terminal 28 through end face contact, so that the sampling unit 41 can collect the parameter information of the battery cell 20 corresponding to the first terminal 27 and the parameter information of the battery cell 20 corresponding to the second terminal 28.

[0365] In addition, the nesting method facilitates the assembly of the sampling unit 41 and the connecting post body 39. Specifically, during assembly, the connecting post body 39 passes through the second through hole 422, and the two sides of the sampling unit 41 abut against the first pole post 27 and the second pole post 28 respectively, thereby completing the assembly of the sampling unit 41 and the connecting post body 39, resulting in high assembly efficiency.

[0366] Please see Figure 18 , Figures 20 to 23 , Figures 26 to 29 In some embodiments, the sampling unit 41 includes a connecting structure 44 and a sleeve structure 441. The sleeve structure 441 cooperates with the connecting structure 44 and is sleeved on the outside of the connecting post body 39. The pole post 21 includes a first pole post 27 and a second pole post 28 with opposite polarities. The two sides of the sleeve structure 441 abut against the first pole post 27 and the second pole post 28, respectively. The connecting structure 44 is connected to the sampling output line 42.

[0367] Therefore, the sampling component 40 can realize the functions of overlay and parameter information output.

[0368] Please combine Figure 18 , Figures 20 to 23 , Figures 26 to 29 The sleeve structure 441 abuts against the first pole post 27 and the second pole post 28 on both sides along the first direction, so that the sampling member 40 can collect the parameter information of the battery cell 20 corresponding to the first pole post 27 and the parameter information of the battery cell 20 corresponding to the second pole post 28 through the sleeve structure 441.

[0369] The parameter information of the battery cell 20 can be transmitted to the output line 42 through the connection structure 44. The output line 42 is designed to facilitate the transmission of the parameter information of the battery cell 20 to the control unit, such as the voltage sampling control unit.

[0370] When assembling the sampling component 40, the first pole post 27, and the second pole post 28, one end of the connecting column body 39 can be first inserted into the first pole post 27 or the second pole post 28, and one side of the sleeve structure 441 can abut against the first pole post 27 or the second pole post 28. Then, the second pole post 28 or the first pole post 27 is inserted into the other end of the connecting column body 39, so that the second pole post 28 or the first pole post 27 abuts against the other side of the sleeve structure 441, thereby completing the assembly of the sampling component 40, the first pole post 27, and the second pole post 28, with high assembly efficiency.

[0371] Optionally, the sleeve structure 441 can be continuously sleeved on the circumferential side of the connecting column body 39 along the circumferential direction. The sleeve structure 441 has a large contact area with the first pole post 27 and the second pole post 28, and the connection is reliable.

[0372] Please see Figure 18 , Figures 20 to 23 , Figures 26 to 29 In some embodiments, the sleeve structure 441 includes a sleeve plate 432, on which a second through hole 422 is provided, and the sleeve plate 432 is sleeved onto the connecting column body 39 through the second through hole 422.

[0373] Therefore, the sampling component 40 can abut against the first pole post 27 and the second pole post 28 respectively through the sleeve plate 432. The large contact area between the sampling component 40 and the first pole post 27 and the second pole post 28 is beneficial to maintaining the connection stability between the sampling component 40 and the first pole post 27 and the second pole post 28.

[0374] Specifically, the sleeve plate 432 has two planar sides along the first direction. The planar sides abut against the first pole post 27 and the second pole post 28, thereby increasing the contact area between the sampling element 40 and the first pole post 27 and the second pole post 28. This makes it difficult for the sampling element 40 to separate from the first pole post 27 and the second pole post 28, thus preventing disconnection and the inability to collect parameter information of the battery cell 20. This helps to maintain the connection stability between the sampling element 40 and the first pole post 27 and the second pole post 28.

[0375] Optionally, the sleeve plate 432 is elastic, and its two sides along the first direction abut against the first pole post 27 and the second pole post 28, respectively. When the sleeve plate 432 is subjected to pressure from the first pole post 27, it can undergo elastic deformation and provide a certain elastic force to the first pole post 27, making the contact between the sleeve plate 432 and the first pole post 27 tighter. When the sleeve plate 432 is subjected to pressure from the second pole post 28, it can provide a certain elastic force to the second pole post 28, making the contact between the sleeve plate 432 and the second pole post 28 tighter. Thus, the abutment between the sleeve plate 432 and the pole post ensures, to a certain extent, effective contact between the side of the sleeve plate 432 and the end face of the pole post, thereby improving the reliability of the connection between the sampling element 40 and the pole post to a certain extent.

[0376] Please see Figures 20 to 23 In some embodiments, there are two sleeve plates 432, which are spaced apart on the connecting structure 44. One of the two sleeve plates 432 abuts against the second pole post 28, and the other of the two sleeve plates 432 abuts against the first pole post 27.

[0377] Optionally, in one embodiment, the sleeve structure 441 can be an integral structural component, that is, the two sleeve plates 432 are integrally formed. In one embodiment, the sleeve structure 441 is made of metal, and the sleeve structure 441 can be manufactured from metal sheets through processes such as stamping and bending. Optionally, the sleeve structure 441 can also be a separate structural component, and the two sleeve plates 432 can be connected by means including but not limited to welding, bolts, etc.

[0378] Two sleeve plates 432 are elastically and spaced apart in the connecting structure 44. One sleeve plate 432 abuts against the first pole post 27, and the other sleeve plate 432 abuts against the second pole post 28. Thus, when one sleeve plate 432 is subjected to pressure from the first pole post 27, that sleeve plate 432 can elastically deform towards the other sleeve plate 432. The spaced-apart sleeve plates 432 provide space for the deformation of the sleeve plates 432. The sleeve plate 432 that undergoes elastic deformation can provide a certain elastic force to the first pole post 27, making the sleeve plate 432 and the first pole post 27 abut more tightly; when the other sleeve plate 432 is subjected to the pressure of the second pole post 28, the other sleeve plate 432 can provide a certain elastic force to the second pole post 28, making the other sleeve plate 432 and the second pole post 28 abut more tightly. Thus, the contact between the sleeve plate 432 and the pole post ensures effective contact between the sleeve plate 432 and the pole post 21 to a certain extent, thereby improving the reliability of the sampling element 40 to a certain extent.

[0379] Please see Figures 24 to 25In some embodiments, the sleeve structure 441 further includes an elastic pad 45 disposed on one side of the sleeve plate 432. The elastic pad 45 has a through hole 451 adapted to the second through hole 422. The sleeve plate 432 and the elastic pad 45 are sleeved on the connecting post body 39 through the second through hole 422 and the through hole 451. The elastic pad 45 abuts against the first pole post 27, and the side of the sleeve portion 43 away from the elastic pad 45 abuts against the second pole post 28.

[0380] The elastic pad 45 can have a certain degree of elasticity; please refer to... Figures 24 to 25 The elastic pad 45 abuts against one side of the sleeve plate 432 along the first direction and the end face of the first pole post 27.

[0381] The elastic pad 45 abuts against the first pole post 27, and the sleeve portion 43 abuts against the second pole post 28 on the side opposite to the elastic pad 45. Thus, the elastic pad 45 can be inserted in an interference fit between the sleeve plate 432 and the first pole post 27, compressing the elastic pad 45. The elastic pad 45 can apply pressure to the sleeve plate 432, achieving effective contact between the sleeve plate 432 and the second pole post 28. The elastic pad 45 includes, but is not limited to, foam.

[0382] Please see Figures 28 to 29 In some embodiments, the sleeve plate 432 has an elastic ring 70 around the second through hole 422, and the sleeve plate 432 is sleeved on the connecting column body 39 through the elastic ring 70.

[0383] Optionally, the elastic ring 70 is conductive, allowing the periphery of the second through hole 422 in the sleeve plate 432 to form an electrical connection with the connecting post body 39. The connecting post body 39 passes through the second through hole 422, and the elastic ring 70 is located between the periphery of the second through hole 422 in the sleeve plate 432 and the circumferential side of the connecting post body 39.

[0384] The sleeve plate 432 is sleeved on the connecting column body 39 through the elastic ring 70. The elastic ring 70 can absorb a certain amount of vibration. Under the condition of vibration impacting the battery cell 20 or the electrical device, it can also maintain effective contact between the sleeve plate 432 and the connecting column body 39 to a certain extent.

[0385] Please see Figure 29 The elastic ring 70 can be disposed 360 degrees along the circumferential direction of the connecting column body 39 between the periphery of the second through hole 422 in the sleeve plate 432 and the connecting column body 39, thereby making the contact area between the elastic ring 70 and the connecting column body 39 large, and the elastic ring 70 can reduce vibration in all directions.

[0386] The elastic ring 70 includes, but is not limited to, a coil, a spring, etc. The coil can be a ring-shaped structure formed by connecting the first and last ends of a helical spring.

[0387] Please see Figure 2 In some embodiments, the battery device 100 further includes a housing 10, a first expansion beam 13 and a second expansion beam 14; the first expansion beam 13 and the second expansion beam 14 are spaced apart, and together with the housing 10, they form a battery compartment 15, and a plurality of battery cells 20 are arranged sequentially in the battery compartment 15, and the battery cells 20 located at the ends cooperate with the first expansion beam 13 and the second expansion beam 14 respectively.

[0388] The battery device 100 of this embodiment can be configured as a CTP (Cell To Pack) solution. Compared with the MTP (Module To Pack) solution, the CTP battery device 100 of this embodiment can reduce the structural components required to fix the battery modules, improve the space utilization within the housing 10, and thus increase the number of battery cells 20 within the housing 10 of the same size, thereby increasing the energy density of the battery device 100.

[0389] Optionally, in Figure 2 In the middle, the first expansion beam 13 and the second expansion beam 14 are spaced apart and together with the housing 10 form two battery compartments 15. Multiple battery cells 20 are arranged along a first direction (e.g., Figure 2 Two rows of battery packs are connected in the front-to-back direction to form a row of battery packs, and the two rows of battery packs are connected along the second direction (such as...). Figure 2 The batteries are arranged in two battery compartments 15, one on the left and one on the right. It is understood that in other embodiments, the number of rows of the battery pack includes, but is not limited to, a single row or two or more rows.

[0390] The first expansion beam 13 and the second expansion beam 14 can be arranged at both ends of the battery pack along the first direction. Figure 2 In the middle, the first expansion beam 13 and the second expansion beam 14 are respectively located at the front end and the rear end of a row of battery packs. The battery cell 20 located at the front end of the battery pack cooperates with the first expansion beam 13, and the battery cell 20 located at the rear end of the battery pack cooperates with the second expansion beam 14, so that the first expansion beam 13 and the second expansion beam 14 bind the row of battery packs in the front-back direction (first direction).

[0391] Optionally, in Figure 2In the battery device 100, the first expansion beam 13 engages with the largest wall surface of the battery cell 20 located at the front end, and the second expansion beam 14 engages with the largest wall surface of the battery cell 20 located at the rear end. During operation, as the electrode assembly releases gas, the expansion of the largest wall surface of the battery cell 20 is greater than that of other walls. By engaging the first expansion beam 13 and the second expansion beam 14 with the largest wall surfaces of the battery cell 20 located at the ends, the cracking of the largest wall surface due to excessive expansion can be prevented to a certain extent, thus improving the safety of the battery device 100.

[0392] Optionally, the battery assembly 100 further includes a crossbeam 16 and a longitudinal beam 17. The crossbeam 16 connects two side panels (such as the left and right side panels) of the housing 10 along a second direction, and the longitudinal beam 17 connects a first expansion beam 13 and a second expansion beam 14 arranged along a first direction. The crossbeam 16 connects to the longitudinal beam 17, thereby improving the structural strength of the housing 10. This application does not specifically limit the number of crossbeams 16 and longitudinal beams 17. Figure 2 In the middle, there is one crossbeam 16 and one longitudinal beam 17. One crossbeam 16 and one longitudinal beam 17 are connected, which can increase the structural strength of the box body 10.

[0393] Thus, the battery cell 20 located at the end cooperates with the first expansion beam 13 and the second expansion beam 14 respectively, so that the first expansion beam 13 and the second expansion beam 14 can restrain the battery cell 20 when it expands.

[0394] According to some embodiments of this application, optionally, the battery device 100 further includes a housing 10, a module shell (not shown), and a mounting beam (not shown), with a plurality of battery cells 20 disposed within the module shell, and the module shell being mounted within the housing 10 via the mounting beam.

[0395] The battery device 100 of this embodiment can be configured as an MTP (Module To Pack) solution.

[0396] Optionally, multiple battery cells 20 are disposed within a module housing to form a battery module, and one or more battery modules can be placed inside the housing 10. The multiple battery modules can be connected in series, in parallel, or in a mixed configuration. The multiple battery cells 20 within a module housing can be connected in series, in parallel, or in a mixed configuration.

[0397] The mounting beam can be fixed inside the housing 10 and connected to the module shell to fix the battery module inside the housing 10. The fixing method may include, but is not limited to, welding, bolt connection, etc.

[0398] Optionally, in one embodiment, the module housing may have a frame-like structure, such as a rectangular frame. Multiple battery cells 20 are located within the space defined by the frame-like structure. Optionally, in one embodiment, the module housing may include cable ties (such as steel straps) to bind and secure the multiple battery cells 20.

[0399] The module housing is installed inside the box 10 via the mounting beam, thereby assembling multiple battery cells 20 into a battery module, and then fixing the battery module inside the box 10 via the mounting beam.

[0400] According to some embodiments of this application, this application provides a battery cell 20, which includes a housing 25, an electrode assembly 26, and a terminal portion 21. The housing 25 includes two opposing first sidewalls 251. The electrode assembly 26 is disposed inside the housing 25 and includes a tab 262 disposed near the edge of the first sidewall 251. The terminal portion 21 is disposed near the edge of the first sidewall 251 where the tab 262 is located and is electrically connected to the tab 262. The terminal portion 21 forms a plug-in portion that protrudes relative to the first sidewall 251 or a plug-in groove that is recessed toward the inside of the housing 25. The plug-in portion or plug-in groove is plugged into an electrical connection post 30 so that the battery cell 20 is electrically connected to the electrical connection post 30.

[0401] Specifically, refer to Figure 3 Electrode assembly 26 is the component in the battery cell 20 where electrochemical reactions occur. The casing 252 may contain one or more electrode assemblies 26. The electrode assembly 26 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the body 261 of the electrode assembly 26, while the portions of the positive and negative electrode sheets without active material each constitute a tab 262. The positive and negative tabs 262 may be located together at one end of the body 261 or at opposite ends of the body 261. During the charging and discharging process of the battery 0, the positive and negative active materials react with the electrolyte, and the tabs 262 connect to the terminal portion 21 to form a current loop.

[0402] Optionally, the connector can be as follows: Figure 14 The second connector 212 shown or as Figure 17 The third connector 214 shown can have a connector slot as follows: Figure 8 The first insertion slot 211 shown or as Figure 17 The third insertion slot 213 is shown.

[0403] The battery cell 20 is connected to the electrical connection post 30 by inserting into the insertion portion or insertion groove formed on the edge of the first sidewall 251, thereby achieving electrical connection with another battery cell 20. This replaces the connection method of welding copper bars to the terminal portions 21 of adjacent battery cells 20 to achieve electrical connection, thereby improving defects such as incomplete soldering and bursting caused by welding copper bars to the terminal portions 21, and improving the reliability of electrical connection between battery cells 20. Connecting the terminal portions 21 of adjacent battery cells 20 by the electrical connection post 30 can standardize the shape of each terminal portion 21 to ensure the manufacturing efficiency of the terminal portion 21, and also facilitates the adjustment of the distance between adjacent battery cells 20 through the middle electrical connection post 30 to accommodate the expansion of battery cells 20, further improving the reliability of electrical connection between battery cells 20.

[0404] Optionally, refer to Figure 30 and Figure 31 The outer casing 25 has a receiving groove 257 located on the two opposing surfaces of the battery cell 20 along a first direction. The receiving groove 257 is recessed into the battery cell 20 relative to its own surface. The receiving groove 257 is used to accommodate the terminal portion 21 and the electrical connection post 30 (not shown). The two terminal portions 21 and the electrical connection post 20 of two adjacent battery cells 20 along the first direction are inserted into the receiving groove 257. The receiving groove 257 for the terminal portion 21 can be located at the end of the outer casing 251. For example, the receiving groove 257 is formed on the two opposing side walls of the outer casing 25 along the first direction and is located at two opposite corners.

[0405] It is understood that, in this embodiment, the first direction is Figure 30 The up and down directions in the middle are also for Figure 31 The direction perpendicular to the paper. (Combined) Figure 2 The receiving groove 257 is recessed on the surface of the battery cell 20 and is used to accommodate the terminal portion 21 and the electrical connection post 30. When two adjacent battery cells 20 are connected, the terminal portion 21 and the electrical connection post 30 are accommodated in the receiving groove 257, which can shorten the distance between two adjacent battery cells 20 in the first direction. This makes it easier for the battery device 100 to arrange more battery cells 20 in a limited volume space and improve the energy density.

[0406] Optionally, refer to Figure 30 and Figure 31The battery cell 20 is generally flat and rectangular, with its length dimension being much larger than its width and height dimensions. The terminal portion 21 extends along the width direction of the battery cell 20 and is located near its end along its length direction. In this embodiment, the length dimension of the terminal portion 21 is smaller than when it extends along the length direction of the battery cell 20; the terminal portion 21 has a short, flat, rectangular structure. The terminal portion 21 has a protruding insertion portion (not shown) or an inwardly recessed insertion groove 392 for insertion with the electrical connection post 30 (not shown).

[0407] According to some embodiments of this application, this application also provides an electrical device, including the battery device 100 described in any of the above embodiments, and the battery device 100 is used to provide electrical energy to the electrical device.

[0408] The power supply device can be any of the aforementioned devices or systems that utilize battery device 100.

[0409] In some embodiments, the electrical device is a vehicle, and the battery device 100 includes a housing 10, in which a plurality of battery cells 20 are disposed; at least a portion of the vehicle chassis forms the top cover of the housing 10.

[0410] The battery device in this embodiment can be configured as a CTB (Cell To Body) solution.

[0411] Alternatively, in one embodiment, please combine Figure 2 The first part 11 can serve as the top cover of the housing 10, and the first part 11 can constitute the chassis of the vehicle. In one embodiment, the first part 11 can cover the opening side of the second part 12, so that the first part 11 and the second part 12 together define a closed space. Optionally, in one embodiment, the first part 11 and the second part 12 can both be hollow structures with openings on one side, and the opening side of the first part 11 covers the opening side of the second part 12. Of course, the housing 10 formed by the first part 11 and the second part 12 can be of various shapes, such as a cylinder, a cuboid, etc.

[0412] Optionally, in one embodiment, the chassis of the vehicle may have a notch, and the battery device 100 is inserted into the notch with the first portion 11 facing the chassis of the vehicle, so that the battery device 100 is mounted on the vehicle, and the first portion 11 constitutes part of the chassis of the vehicle.

[0413] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: Multiple battery cells are arranged along a first direction, and each battery cell is provided with an electrode portion; An electrical connection post is provided, in the first direction, to be inserted into the terminal portion of two adjacent battery cells to electrically connect the two adjacent battery cells.

2. The battery device according to claim 1, characterized in that, The pole portion has a first insertion groove, and the electrical connection post has a first insertion portion. At least a portion of the first insertion portion is inserted into the first insertion groove to electrically connect and cooperate with the first insertion groove.

3. The battery device according to claim 2, characterized in that, The electrode post protrudes from the surface of the battery cell, and the protruding part of the electrode post forms a first insertion groove that is recessed toward the interior of the battery cell. Alternatively, the first insertion slot is recessed into the interior of the battery cell on the surface of the battery cell.

4. The battery device according to claim 2, characterized in that, Both of the two pole sections directly electrically connected by the electrical connection post have the first insertion slot formed therein; the first insertion portion is formed on both sides of the electrical connection post along the first direction. The electrical connection post is inserted into the first insertion slot at the corresponding position on both sides along the first direction.

5. The battery device according to claim 4, characterized in that, The electrical connection post includes a body portion and connecting portions connected to both sides of the body portion, with each of the two connecting portions forming a first insertion portion.

6. The battery device according to claim 2, characterized in that, At least one of the first insertion slot and the first insertion part is provided with an elastic member, which elastically abuts against the groove wall of the first insertion slot and the outer periphery of the first insertion part to prevent the first insertion part from disengaging from the first insertion slot.

7. The battery device according to claim 6, characterized in that, The line connecting the two pole sections is a first direction, and the elastic element is arched in a second direction, with the second direction forming an angle with the first direction.

8. The battery device according to claim 7, characterized in that, The elastic element includes a first end and a second end fixed to the first insertion portion, and a deformable portion between the first end and the second end. The first end and the second end are opposite each other along the first direction. The deformable portion is separated from the surface of the first insertion portion and arches towards the second direction. The elastic element is configured to deform near the surface of the first insertion portion during the engagement of the first insertion portion with the first insertion slot.

9. The battery device according to claim 8, characterized in that, The first insertion slot has a limiting hole in its wall that mates with the deformable part. When the first insertion part is inserted into the first insertion slot, at least a portion of the deformable part extends into the limiting hole and abuts against the hole wall.

10. The battery device according to claim 5, characterized in that, A flow guide groove is formed on the circumferential surface of the connecting part, and an injection hole is formed on the main body part. The flow guide groove is connected to the injection hole. The battery device further includes a conductive adhesive layer, wherein the conductive adhesive of the conductive adhesive layer is injected through the injection hole and the flow channel and is conductively filled between the first insertion slot and the first insertion portion.

11. The battery device according to claim 10, characterized in that, One of the injection holes is in communication with at least two of the flow channels located on either side of it.

12. The battery device according to claim 6, characterized in that, The electrical connection post includes a body portion and connection portions connected to both sides of the body portion, with each of the two connection portions forming a first plug-in portion; Each of the first plug-in portions is provided with a plurality of elastic elements at intervals.

13. The battery device according to claim 12, characterized in that, The direction of the line connecting the two pole portions is a first direction, and the length extension directions of the pole portion and the electrical connection portion are both third directions, with the third direction forming an angle with the first direction; or, The line connecting the two pole sections is a first direction, the elastic element is arched in a second direction, and the length extension direction of the pole section and the electrical connection section is a third direction. The first direction, the second direction, and the third direction are perpendicular to each other.

14. The battery device according to claim 1, characterized in that, The electrical connection post has a second insertion slot, and the pole portion has a second insertion portion. At least a portion of the second insertion portion is inserted into the second insertion slot to electrically connect and cooperate with the second insertion slot.

15. The battery device according to claim 14, characterized in that, The electrode post protrudes from the surface of the battery cell, and the protruding portion of the electrode post forms the second insertion portion; or, The electrode post is recessed into the battery cell from the surface of the battery cell, and the bottom wall of the recessed electrode post protrudes in a direction away from the battery cell to form the second insertion part. The protrusion depth of the second insertion part is less than or equal to the depth of the recess of the electrode post, and the circumferential dimension of the second insertion part is less than the circumferential dimension of the recess of the electrode post.

16. The battery device according to claim 14, characterized in that, Both of the two pole sections that are directly electrically connected by the electrical connection post have a second plug-in portion; the electrical connection post includes a body section, and the body section has a second plug-in groove formed on both sides along the first direction; The electrical connection post is inserted into the second insertion part at the corresponding position on both sides along the first direction.

17. The battery device according to claim 16, characterized in that, The main body has an injection hole, which is connected to the second insertion groove.

18. The battery device according to claim 17, characterized in that, The number of injection holes is multiple, and the multiple injection holes are all disposed on the surfaces of the body part that are opposite each other along the second direction. The second direction forms an angle with the first direction. The multiple injection holes are arranged at intervals along the length extension direction of the body part. One of the injection holes is connected to one of the second insertion slots on both sides.

19. The battery device according to claim 18, characterized in that, The battery device further includes a conductive adhesive layer, the conductive adhesive of which is injected into the second insertion groove through the injection hole and conductively fills the space between the second insertion groove and the second insertion portion.

20. The battery device according to claim 14, characterized in that, The width of the second connector increases along the direction of the protrusion of the second connector.

21. The battery device according to claim 14, characterized in that, The battery device includes a limiting member disposed at at least one end of the electrical connection post along its length, for preventing the second insertion portion from sliding relative to the second insertion slot.

22. The battery device according to claim 21, characterized in that, The electrical connection post forms a limiting groove, which is located at at least one end of the second insertion groove along its length and communicates with the second insertion groove. The limiting member engages with the limiting groove and abuts against at least one end of the second insertion portion along its length.

23. The battery device according to claim 1, characterized in that, One of the two electrode portions directly electrically connected by the electrical connection post has a third insertion groove, and the other has a third insertion portion. A fourth insertion portion is formed on one side of the electrical connection portion, and a fourth insertion groove is formed on the other side. At least a portion of the fourth insertion portion extends into the third insertion groove and is inserted into the third insertion groove. At least a portion of the third insertion portion extends into the fourth insertion groove and is inserted into the fourth insertion groove.

24. The battery device according to claim 23, characterized in that, The electrode portion having the third insertion groove protrudes from the surface of the battery cell, and the protruding portion of the electrode portion has the third insertion groove recessed towards the interior of the battery cell. Alternatively, the third insertion groove is recessed into the interior of the battery cell on the surface of the battery cell.

25. The battery device according to claim 23, characterized in that, The electrode portion having the third connector protrudes from the surface of the battery cell, and the protruding portion of the electrode portion forms the third connector. Alternatively, the electrode portion having the third insertion portion is recessed into the battery cell on the surface of the battery cell, and the bottom wall of the recessed electrode portion protrudes in a direction away from the battery cell to form the third insertion portion. The protrusion depth of the third insertion portion is less than or equal to the recess depth of the electrode portion, and the circumferential dimension of the third insertion portion is less than the circumferential dimension of the recess of the electrode portion.

26. The battery device according to claim 23, characterized in that, The electrical connection post includes a body portion, one side of which is connected to the fourth plug portion along the first direction, and the other side is formed with the fourth plug groove. The fourth plug portion protrudes from the surface of the body portion, and the fourth plug groove is recessed into the fourth plug portion on the surface of the body portion.

27. The battery device according to claim 26, characterized in that, The main body has a plurality of injection holes, and the fourth insertion part has a guide groove. One of the injection holes is connected to one of the guide groove and the fourth insertion groove. The battery device further includes a conductive adhesive layer, wherein the conductive adhesive of the conductive adhesive layer is injected into the flow channel through the injection hole and conductively fills the space between the fourth insertion part and the third insertion groove; or, the conductive adhesive of the conductive adhesive layer is injected into the fourth insertion groove through the injection hole and conductively fills the space between the fourth insertion groove and the third insertion part.

28. The battery device according to claim 26, characterized in that, The fourth plug portion is provided with a plurality of elastic members at intervals along the length extension direction of the main body portion. The elastic members elastically abut against the groove wall of the third plug groove and the outer periphery of the fourth plug portion to prevent the fourth plug portion from disengaging from the third plug groove.

29. The battery device according to any one of claims 1 to 28, characterized in that, The battery cell includes a housing and an electrode assembly, the electrode assembly being disposed inside the housing, and the housing having mounting holes; In this configuration, the entire pole portion covers the outside of the mounting hole; or, a portion of the pole portion covers the outside of the mounting hole, and a portion of the pole portion extends through the mounting hole into the housing to mate with the housing. The pole section is electrically connected to the electrode assembly.

30. The battery device according to claim 29, characterized in that, The housing includes a shell and an end cap, the shell having an opening, and the end cap sealingly covering the opening; the pole portion is disposed on either the shell or the end cap.

31. The battery device according to any one of claims 1 to 28, characterized in that, The battery cell has two first sidewalls facing away from each other in the first direction, two second sidewalls facing away from each other in the second direction, and two third sidewalls facing away from each other in the third direction. The first direction, the second direction, and the third direction are perpendicular to each other. The electrode post is disposed on the first sidewall. The areas of the second sidewall and the third sidewall are both larger than the area of ​​the first sidewall; or, The areas of the second sidewall and the third sidewall are both smaller than the area of ​​the first sidewall.

32. The battery device according to claim 31, characterized in that, The battery cell includes a housing and an electrode assembly disposed within the housing; the electrode post is disposed in the housing, and the tabs of the electrode assembly are electrically connected to the electrode post; The electrode assembly has a gap between the end of the tab and the outer shell, and the tab is disposed within the gap; the electrode post is disposed at a position opposite to the gap on the outer shell.

33. The battery device according to claim 31, characterized in that, The battery cell includes a pressure relief mechanism disposed on one of the two second sidewalls and the two third sidewalls, the pressure relief mechanism being used to rupture when the internal pressure of the battery cell exceeds a pressure threshold.

34. The battery device according to any one of claims 1 to 28, characterized in that, The battery device includes a sampling component that directly contacts the terminal portion to collect parameter information of the corresponding battery cell.

35. The battery device according to claim 34, characterized in that, The contact method between the sampling element and the pole portion includes at least one of the following: The sampling element contacts at least one of the two connected pole sections in the axial direction of the pole section; The sampling element contacts at least one of the two connected pole sections in the circumferential direction of the pole section; The sampling element contacts at least one of the two connected pole sections in the radial direction of the pole section.

36. The battery device according to claim 34, characterized in that, The electrical connection post includes a connection post body and a sampling part. The connection post body is inserted into the terminal portion of two adjacent battery cells respectively. The sampling part is disposed on the connection post body and forms the sampling element.

37. The battery device according to claim 36, characterized in that, The sampling part is integrally formed with the connecting column body; or, the sampling part is sleeved on the outside of the connecting column body; The two sides of the sampling section abut against the two electrode sections that are electrically connected.

38. The battery device according to claim 37, characterized in that, The sampling section includes a connecting structure and a sleeve structure. The sleeve structure cooperates with the connecting structure and is sleeved on the outside of the connecting post body. The pole part includes a first pole and a second pole with opposite polarities. The two sides of the sleeve structure abut against the first pole and the second pole, respectively. The connecting structure is connected to the sampling output line.

39. The battery device according to claim 38, characterized in that, The sleeve structure includes a sleeve plate with a second through hole, and the sleeve plate is sleeved onto the insertion part through the second through hole.

40. The battery device according to claim 39, characterized in that, The number of sleeve plates is two, and they are spaced apart in the connection structure. One of the two sleeve plates abuts against the second pole post, and the other of the two sleeve plates abuts against the first pole post.

41. The battery device according to claim 39, characterized in that, The sleeve structure also includes an elastic pad disposed on one side of the sleeve plate. The elastic pad has a through hole adapted to the second through hole. The sleeve plate and the elastic pad are sleeved on the insertion part through the second through hole and the through hole. The elastic pad abuts against the first pole post, and the side of the sleeve part away from the elastic pad abuts against the second pole post.

42. The battery device according to claim 39, characterized in that, An elastic ring is provided around the second through hole of the sleeve plate, and the sleeve plate is sleeved on the insertion part through the elastic ring.

43. The battery device according to any one of claims 1 to 28, characterized in that, The battery device further includes a housing, a first expansion beam, and a second expansion beam; the first expansion beam and the second expansion beam are spaced apart, and together with the housing, they form a battery compartment, and a plurality of battery cells are arranged sequentially in the battery compartment, with the battery cells located at the ends respectively cooperating with the first expansion beam and the second expansion beam; or, The battery device also includes a housing, a module shell, and a mounting beam. The plurality of battery cells are disposed inside the module shell, and the module shell is mounted to the housing via the mounting beam.

44. A single battery cell, characterized in that, The battery cell includes: An outer casing, the outer casing comprising two opposing first sidewalls; Electrode assembly, the electrode assembly being disposed within the housing, the electrode assembly including tabs disposed near the edge of the first sidewall; and The electrode post is disposed near the edge of the first sidewall where the electrode tab is located and is electrically connected to the electrode tab. The electrode post has a plug-in portion that protrudes relative to the first sidewall or a plug-in groove that is recessed toward the inside of the housing. The plug-in portion or the plug-in groove of the electrode post is plugged into an electrical connection post so that the battery cell is electrically connected to the electrical connection post.

45. An electrical appliance, characterized in that, Includes the battery device according to any one of claims 1-43, the battery device being used to provide electrical energy; or, Includes the battery cell of claim 44, the battery cell being used to provide electrical energy.

46. ​​The electrical appliance according to claim 45, characterized in that, The electrical device is a vehicle, and the battery device includes a housing, in which multiple battery cells are disposed; at least a portion of the vehicle chassis forms the top cover of the housing.

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