Battery device, battery cell and electric device

Abstract

A battery device (100), a battery cell (20) and an electric device. The battery device (100) comprises a plurality of battery cells (20) and electrical connection posts (30), wherein the plurality of battery cells (20) are arranged in a first direction, and the battery cells (20) are provided with terminal post portions (21); and in the first direction, the electrical connection posts (30) are each inserted into each of the terminal post portions (21) of two adjacent battery cells (20), so as to electrically connect the two adjacent battery cells (20).

Description

Battery device, battery cell and electric device

[0001] Priority information

[0002] This application claims priority to and the benefit of the filing date of Chinese Patent Application No. 202411124769.4, filed August 15, 2024, and is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present application relates to the technical field of batteries, in particular to a battery device, a battery cell and an electric device. BACKGROUND

[0004] In the related art, a battery device includes a plurality of battery cells, and the two pole columns of two battery cells are electrically connected by a copper bar. During use of the battery device, vibration and impact often occur, in which case the copper bar will pull the solder joint between the copper bar and the pole column, resulting in reduced reliability of the battery cells. SUMMARY

[0005] In view of the above problems, the present application provides a battery device, a battery cell and an electric device, which can improve the reliability of the connection between the battery cells.

[0006] In a first aspect, the present application provides a battery device, which includes a plurality of battery cells and an electrical connection column, wherein the plurality of battery cells are arranged along a first direction, and each battery cell is provided with a pole column portion; in the first direction, the electrical connection column is inserted into the pole column portions of two adjacent battery cells to electrically connect the two adjacent battery cells.

[0007] In the embodiments of the present application, on the one hand, the electrical connection of two battery cells is achieved by inserting the two battery cells into the electrical connection column, instead of welding a copper bar to the pole column portions of adjacent battery cells to achieve the electrical connection of the battery cells, thereby improving the defects such as virtual welding and burst holes caused by welding the copper bar to the pole column portions, and improving the reliability of the electrical connection between the battery cells; on the other hand, the pole column portions of adjacent battery cells are connected by the electrical connection column, which not only unifies the shape of each pole column portion to ensure the manufacturing efficiency of the pole column portion, but also facilitates adjusting the distance between adjacent battery cells through the intermediate electrical connection column to adapt to the expansion of the battery cells, thereby further improving the reliability of the electrical connection between the battery cells; in addition, the electrical connection column is inserted into the pole column portions to form the electronic path of the battery device, which reduces the welding of the pole columns of the battery cells, so that the battery cells can be disassembled and replaced, and the maintainability is higher.

[0008] In some embodiments, the pole portion is formed with a first insertion slot, the electric connection column is formed with a first insertion portion, and at least part of the first insertion portion is inserted into the first insertion slot to electrically connect with the first insertion slot.

[0009] In the embodiments of the present application, the electric connection between the pole portion and the electric connection column is achieved by inserting the first insertion portion into the first insertion slot, which is relatively simple and stable.

[0010] In some embodiments, the pole portion protrudes from the surface of the battery cell, and the protruding part of the pole portion is formed with a first insertion slot recessed towards the inside of the battery cell.

[0011] In the embodiments of the present application, the pole portion protrudes from the surface of the battery cell, thereby reducing the influence of the damage of the pole portion on the electrode assembly and other structures inside the battery cell. In addition, it is convenient to manufacture and assemble when the pole portion and the battery cell are formed separately.

[0012] Similarly, the first insertion slot is recessed from the surface of the battery cell towards the inside of the battery cell, so that the electric connection column is directly inserted into the inside of the surface of the battery cell, the pole portion is not easy to deform under the conditions of collision, extrusion, pulling and the like, and the insertion structure of the first insertion slot and the electric connection column is relatively stable.

[0013] In some embodiments, both of the pole portions directly electrically connected by the electric connection column are formed with a first insertion slot, and the electric connection column is formed with a first insertion portion on both sides along the first direction, and the electric connection column is respectively inserted into the first insertion slot at the corresponding position on both sides along the first direction.

[0014] In the embodiments of the present application, both of the pole portions directly electrically connected by the electric connection column are formed with a first insertion slot, the electric connection column is formed with a first insertion portion on both sides along the first direction, and the electric connection column is respectively inserted into the first insertion slot at the corresponding position on both sides along the first direction, so that a plurality of battery cells are connected in sequence in the first direction by being inserted with the electric connection column, and the connection reliability is relatively high, and it is relatively convenient to disassemble and maintain.

[0015] In some embodiments, the electric connection column comprises a body portion and a connection portion connected to both sides of the body portion, and each of the two connection portions forms a first insertion portion.

[0016] In the embodiments of the present application, the electric connecting post comprises a body part and two connecting parts connected to the two sides of the body part, and each of the two connecting parts forms a first insertion part, so that when the first insertion parts on the two sides of the electric connecting post are respectively inserted into the pole parts of the two battery monomers, the body part improves the strength of the electric connecting post itself and improves the mechanical properties such as compression resistance, tensile resistance, impact resistance, extrusion resistance and wear resistance of the insertion structure.

[0017] In some embodiments, at least one of the first insertion slot and the first insertion part is connected with an elastic member elastically abutting between the wall of the first insertion slot and the outer periphery of the first insertion part to prevent the first insertion part from being separated from the first insertion slot.

[0018] In the embodiments of the present application, the elastic member elastically abuts between the wall of the first insertion slot and the outer periphery of the first insertion part to prevent the first insertion part from being separated from the first insertion slot, so that the elastic member can maintain sufficient contact between the electric connecting post and the pole part under static and dynamic conditions such as vibration impact, thereby improving the reliability of the electrical connection between the battery monomers.

[0019] In some embodiments, the connecting direction of the two pole parts is a first direction, the elastic member is arched in a second direction, and the second direction forms an angle with the first direction.

[0020] In the embodiments of the present application, the connecting direction of the two pole parts is a first direction, the elastic member is arched in a second direction, and the second direction forms an angle with the first direction, so that when the first insertion part is inserted into the first insertion slot, the elastic member is deformed by being pressed down at the arched part, and an elastic force in the second direction is applied between the wall of the first insertion slot and the outer periphery of the first insertion part to separate the two pole parts from the electric connecting post.

[0021] In some embodiments, the elastic member comprises a first end and a second end fixed to the first insertion part, and a deformation part between the first end and the second end, the first end and the second end are opposite in the first direction, the deformation part is separated from the surface of the first insertion part and arched towards the second direction, and the elastic member is configured to be deformed by approaching the surface of the first insertion part during the engagement of the first insertion part with the first insertion slot.

[0022] In the embodiments of the present application, the first end and the second end are fixed to the first insertion part, and the deformation part is separated from the first insertion part and arched, so that the deformation part is compressed and deformed during the engagement of the first insertion part with the first insertion slot, and the first end and the second end can fix the overall position of the elastic member, so that the deformation part can stably abut against the wall of the first insertion slot to prevent the first insertion part from being separated from the first insertion slot and to ensure the insertion reliability of the electric connecting post and the pole part.

[0023] In some embodiments, the slot wall of the first insertion slot has a limiting hole matched with the deformation part, and when the first insertion part is inserted into the first insertion slot, at least part of the deformation part extends into the limiting hole and abuts against the hole wall.

[0024] In the embodiments of the present application, by matching the limiting hole with the deformation part in the slot wall of the first insertion slot, and when the first insertion part is inserted into the first insertion slot, at least part of the deformation part extends into the limiting hole and abuts against the hole wall, the contact area when the first insertion part is inserted into the first insertion slot is increased, and in turn, the flow area of the electrical connection column and the pole column part is increased. At the same time, by matching the deformation part with the limiting hole, the reliability of the insertion of the first insertion part into the first insertion slot is also improved.

[0025] In some embodiments, the circumferential surface of the connecting part is formed with a flow guide groove, the body part is formed with a glue injection hole, and the flow guide groove and the glue injection hole are communicated; the battery device further comprises a conductive glue layer, and the conductive glue of the conductive glue layer is injected through the glue injection hole and the flow guide groove and is conductively filled between the first insertion slot and the first insertion part.

[0026] In the embodiments of the present application, by forming the flow guide groove on the circumferential surface of the connecting part, forming the glue injection hole on the body part, and communicating the flow guide groove and the glue injection hole, the conductive glue is injected through the glue injection hole and the flow guide groove and is conductively filled between the first insertion slot and the first insertion part to form the conductive glue layer, so that the conductive glue layer fills the cavity gap after the first insertion part is inserted into the first insertion slot, and connects the surface of the first insertion part and the slot wall of the first insertion slot, thereby increasing the flow contact surface of the electrical connection column and the pole column part and improving the conductive performance.

[0027] In some embodiments, one glue injection hole is communicated with at least two flow guide grooves located on both sides thereof.

[0028] In the embodiments of the present application, by communicating the glue injection hole with at least two flow guide groves located on both sides thereof, it is ensured that each flow guide groove can be fully filled with conductive glue, and the glue injection efficiency is improved.

[0029] In some embodiments, the electrical connection column comprises a body part and connecting parts connected to both sides of the body part, and each of the two connecting parts forms a first insertion part; a plurality of elastic members are arranged on each first insertion part in a spaced manner.

[0030] In the embodiments of the present application, a plurality of elastic members are arranged on each first insertion part on both sides of the body part in a spaced manner, thereby improving the ability of the elastic members to prevent the first insertion part from being separated from the first insertion slot, and in turn, the stability of the insertion is ensured.

[0031] In some embodiments, the two polar column portions are connected in the first direction, the lengths of the polar column portions and the electrical connection portion extend in the third direction, and the third direction and the first direction form an angle. In other embodiments, the two polar column portions are connected in the first direction, the elastic member is arched in the second direction, the lengths of the polar column portions and the electrical connection portion extend in the third direction, and the first direction, the second direction, and the third direction are perpendicular to each other.

[0032] The two polar column portions are connected in the first direction, the lengths of the polar column portions and the electrical connection portion extend in the third direction, and the elastic member is arched in the second direction, the first direction, the second direction, and the third direction are perpendicular to each other, so that the elastic member can prevent the first plug-in portion from being separated from the first plug-in slot to the greatest extent.

[0033] In some embodiments, the electrical connection column is formed with a second plug-in slot, the polar column portion is formed with a second plug-in portion, and at least a portion of the second plug-in portion is inserted into the second plug-in slot to electrically connect with the second plug-in slot.

[0034] In the embodiments of the present application, the electrical connection between the polar column portion and the electrical connection column is achieved by inserting the second plug-in portion into the second plug-in slot, which is relatively simple to operate and stable in connection. Meanwhile, the two battery monomers that are electrically connected can be exempted from welding, thereby avoiding the problem that the electrode assembly is easily damaged when the polar column portion is disassembled from the welding position.

[0035] In some embodiments, the polar column portion protrudes from the surface of the battery monomer, and the protruding portion of the polar column portion forms the second plug-in portion. In other embodiments, the polar column portion is recessed from the surface of the battery monomer to the inside of the battery monomer, and the bottom wall of the recessed polar column portion protrudes in a direction away from the battery monomer to form the second plug-in portion. The protruding depth of the second plug-in portion is less than or equal to the recessed depth of the polar column portion, and the circumferential dimension of the second plug-in portion is less than the circumferential dimension of the recessed polar column portion.

[0036] The polar column portion protrudes from the surface of the battery monomer, thereby reducing the influence of damage to the electrode assembly and other structures inside the battery monomer. In addition, it is convenient to manufacture and assemble when the polar column portion and the battery monomer are formed separately.

[0037] The polar column portion is recessed from the surface of the battery monomer to the inside of the battery monomer, so that the electrical connection column is directly inserted into the inside of the surface of the battery monomer, and the second plug-in portion and the second plug-in slot are plugged in the inside of the surface of the battery monomer, thereby reducing external interference and improving the connection reliability of the electrical connection column and the battery monomer.

[0038] In some embodiments, the two polar column portions directly electrically connected by the electrical connection column are each formed with a second plug-in portion; the electrical connection column includes a body portion, and the body portion is formed with a second plug-in slot on each side in the first direction; and the electrical connection column is plugged with the second plug-in portion at the corresponding position on each side in the first direction.

[0039] The two pole column parts directly connected by the electric connection column are each formed with a second plug-in part, the electric connection column is formed with a second plug-in slot on both sides along the first direction, and the second plug-in part at the corresponding position on both sides along the first direction is respectively plugged in, so that the plurality of battery monomers are sequentially connected in the first direction by plugging in the electric connection column, and the connection reliability is high, and the disassembly and maintenance are convenient.

[0040] In some embodiments, the body part is formed with a glue injection hole, and the glue injection hole is communicated with the second plug-in slot.

[0041] In the embodiments of the present application, the body part is formed with a glue injection hole, and the glue injection hole is communicated with the second plug-in slot, so that the conductive glue can flow into the second plug-in slot through the glue injection hole and fill the cavity gap after the first plug-in part and the first plug-in slot are plugged in.

[0042] In some embodiments, the number of glue injection holes is multiple, the multiple glue injection holes are arranged on the surfaces of the body part opposite along the second direction, the second direction forms an angle with the first direction, the multiple glue injection holes are arranged at intervals along the length extension direction of the body part, and one glue injection hole is communicated with one of the second plug-in slots on both sides.

[0043] In the embodiments of the present application, by arranging multiple glue injection holes along the length extension direction of the body part, the glue injection holes are communicated with at least one second plug-in slot, so that the conductive glue is injected through the multiple glue injection holes, and the second plug-in slot is quickly and sufficiently filled.

[0044] In some embodiments, the battery device further comprises a conductive glue layer, and the conductive glue of the conductive glue layer is injected into the second plug-in slot through the glue injection hole and is conductively filled between the second plug-in slot and the second plug-in part.

[0045] In the embodiments of the present application, the conductive glue connects the groove surface of the second plug-in part and the second plug-in slot, so as to increase the flow contact surface of the electric connection column and the pole column part and improve the conductive performance.

[0046] In some embodiments, the width of the second plug-in part increases in the direction in which the second plug-in part protrudes.

[0047] In the embodiments of the present application, the width of the second plug-in part increases in the direction in which the second plug-in part protrudes, the second plug-in part has the maximum width at the top in the protruding direction, so that the top of the second plug-in part is accommodated in the second plug-in slot, and the second plug-in part can to some extent hinder the second plug-in part from being separated from the second plug-in slot.

[0048] In some embodiments, the battery device comprises a limiting piece arranged at at least one end of the electric connection column in the length direction, for stopping the second plug-in part from sliding relative to the second plug-in slot.

[0049] In the embodiments of the present application, the second plug-in part is stopped from sliding relative to the second plug-in slot by the limiting member at at least one end of the length direction of the electric connection column, so that the plug-in of the second plug-in part into the second plug-in slot is more firm, thereby further improving the connection stability of the electric connection column and the battery cell.

[0050] In some embodiments, the electric connection column forms a limiting slot, the limiting slot is located at at least one end of the length direction of the second plug-in slot and communicates with the second plug-in slot, and the limiting member is engaged with the limiting slot and abuts against at least one end of the length direction of the second plug-in part.

[0051] In the embodiments of the present application, the second plug-in part is stopped from sliding relative to the second plug-in slot by the limiting member at at least one end of the length direction of the electric connection column, so that the plug-in of the second plug-in part into the second plug-in slot is more firm, thereby further improving the connection stability of the electric connection column and the battery cell.

[0052] In some embodiments, one of the two pole parts directly electrically connected by the electric connection column forms a third plug-in slot, and the other forms a third plug-in part, one side of the electric connection part forms a fourth plug-in part, and the other side forms a fourth plug-in slot, at least part of the fourth plug-in part extends into the third plug-in slot and is plugged into the third plug-in slot, and at least part of the third plug-in part extends into the fourth plug-in slot and is plugged into the fourth plug-in slot.

[0053] In the embodiments of the present application, the fourth plug-in slot recessed and the fourth plug-in part protruded are formed on the two sides of the electric connection column, so that one side of the electric connection column accommodates the third plug-in part and the other side is plugged into the third plug-in slot, thereby facilitating the adjustment of the distance between the adjacent two battery cells to adapt to the expansion of the battery cells, and further improving the reliability of the electrical connection between the battery cells.

[0054] In some embodiments, the pole part forming the third plug-in slot protrudes from the surface of the battery cell, and the part protruding from the pole part forms the third plug-in slot recessed towards the inside of the battery cell.

[0055] In the embodiments of the present application, the influence of the damage of the pole part on the electrode assembly and other structures inside the battery cell can be reduced. In addition, the separate molding of the pole part and the battery cell facilitates the molding and assembly.

[0056] In other embodiments, the third plug-in slot is recessed towards the inside of the battery cell from the surface of the battery cell. In the embodiments of the present application, the pole part is not easy to deform under the conditions of collision, extrusion, pulling and the like, and the plug-in structure of the first plug-in slot and the electric connection column is relatively stable.

[0057] In some embodiments, the pole part forming the third plug-in part protrudes from the surface of the battery cell, and the part protruding from the pole part forms the third plug-in part.

[0058] In the embodiments of the present application, the third plug-in part is located on the outside of the battery monomer, reducing the influence of the damage of the pole part on the internal structure of the battery monomer. In addition, in the case where the pole part and the battery monomer are formed separately, the molding and assembly are facilitated.

[0059] In some other embodiments, the pole part formed with the third plug-in part is recessed towards the inside of the battery monomer on the surface of the battery monomer, and the bottom wall of the pole part after being recessed is protruded towards the direction away from the battery monomer to form the third plug-in part, the protrusion depth of the third plug-in part is less than or equal to the depth of the pole part after being recessed, and the circumferential dimension of the third plug-in part is less than the circumferential dimension of the pole part after being recessed.

[0060] In the embodiments of the present application, the third plug-in part and the fourth plug-in slot are plugged in on the inside of the surface of the battery monomer, thereby reducing external interference and improving the connection reliability of the pole part and the electric connection column.

[0061] In some embodiments, the electric connection column comprises a body part, one side of the body part along the two sides of the first direction is connected with the fourth plug-in part, and the other side is formed with the fourth plug-in slot, the fourth plug-in part is protruded from the surface of the body part, and the fourth plug-in slot is recessed towards the fourth plug-in part on the surface of the body part.

[0062] In the embodiments of the present application, the fourth plug-in part and the fourth plug-in slot are respectively arranged on the two sides of the body part along the first direction, the fourth plug-in part is protruded from the surface of the body part, and the fourth plug-in slot is recessed towards the fourth plug-in part on the surface of the body part, so that the left and right sides of the electric connection column are connected with the pole part of the battery monomer in different plug-in or receiving modes, which is conducive to adjusting the width between the two battery monomers, adapting to the expansion of the battery monomer, and further improving the electric connection reliability.

[0063] In some embodiments, the body part is formed with a plurality of glue injection holes, the fourth plug-in part is formed with a flow guide groove, and one of the glue injection holes is in communication with the flow guide groove and one of the fourth plug-in slots; the battery device further comprises a conductive glue layer, and the conductive glue of the conductive glue layer is injected into the flow guide groove through the glue injection hole and is conductively filled between the fourth plug-in part and the third plug-in slot, or the conductive glue of the conductive layer is injected into the fourth plug-in slot through the glue injection hole and is conductively filled between the fourth plug-in slot and the third plug-in part.

[0064] In the embodiments of the present application, the conductive glue is injected into the flow guide groove through the glue injection hole and is conductively filled between the fourth plug-in part and the third plug-in slot, or is injected into the fourth plug-in slot through the glue injection hole and is conductively filled between the fourth plug-in slot and the third plug-in part, so as to ensure good conductive contact between the fourth plug-in part and the third plug-in slot, between the fourth plug-in slot and the third plug-in part, increase the overcurrent area, and improve the conductive performance.

[0065] In some embodiments, the fourth insertion portion is provided with a plurality of elastic members along the length direction of the body portion, the elastic members elastically abutting between the slot wall of the third insertion slot and the outer periphery of the fourth insertion portion to prevent the fourth insertion portion from being separated from the third insertion slot.

[0066] In the embodiments of the present application, the elastic members elastically abut between the slot wall of the third insertion slot and the outer periphery of the fourth insertion portion, thereby exerting an elastic force on the slot wall of the third insertion slot to prevent the fourth insertion portion from being separated from the third insertion slot, and improve the connection reliability of the electric connection column and the pole portion.

[0067] In some embodiments, the battery monomer includes a shell and an electrode assembly, the electrode assembly is arranged in the shell, and the shell is provided with a mounting hole. The pole portion is entirely arranged outside the mounting hole, or part of the pole portion is arranged outside the mounting hole and part of the pole portion extends into the shell through the mounting hole to cooperate with the shell; and the pole portion is electrically connected with the electrode assembly.

[0068] In the embodiments of the present application, the pole portion is entirely arranged outside the mounting hole, which facilitates the assembly of the pole portion and the shell, simplifies the manufacturing process, and improves the connection reliability and stability of the pole portion and the shell, so that the pole portion and the shell are not easily separated from each other or cracked or damaged due to vibration or external pulling during the charging and discharging process of the battery monomer.

[0069] In the embodiments of the present application, part of the pole portion is arranged outside the mounting hole and part of the pole portion extends into the shell through the mounting hole to cooperate with the shell, which is conducive to improving the electrical connection stability and overcurrent capacity of the pole portion and the electrode assembly in the shell.

[0070] In some embodiments, the shell includes a shell body and an end cover, the shell body has an opening, and the end cover seals the opening; and the pole portion is arranged in any one of the shell body and the end cover.

[0071] In the embodiments of the present application, the shell body has an opening, and the end cover seals the opening; and the pole portion is arranged in any one of the shell body and the end cover, which facilitates the assembly and production of the shell and the electrode assembly.

[0072] In some embodiments, the battery monomer has two first side walls opposite in a first direction, two second side walls opposite in a second direction, and two third side walls opposite in a third direction, the first direction, the second direction, and the third direction are perpendicular to each other, the pole portion is arranged on the first side wall, and the areas of the second side wall and the third side wall are greater than the area of the first side wall.

[0073] In the embodiments of the present application, the first side wall is the wall with the smallest area in the cuboid, so that the expansion of the battery cell at the first side wall during use is small, reducing the influence of the expansion of the battery cell on the pole part, and further ensuring the electrical connection reliability of the battery cell and the electrical connection column.

[0074] In other embodiments, the areas of the second side wall and the third side wall are both smaller than the area of the first side wall. In the embodiments of the present application, the pole part is arranged at the first side wall with the largest area, which can increase the overcurrent area of the electrical connection of the battery cell and ensure the fast charging performance.

[0075] In some embodiments, the battery cell includes a shell and an electrode assembly arranged in the shell; the pole is arranged in the shell, and the tab of the electrode assembly is electrically connected with the pole; the end of the tab arranged in the electrode assembly forms a gap with the shell, and the tab is arranged in the gap; and the pole is arranged at a position opposite to the gap.

[0076] In the embodiments of the present application, the pole is arranged at a position opposite to the gap, and when the battery cell is working, the main body of the electrode assembly will expand, and the expanded main body can drive the pole arranged on the shell to move. If the pole is arranged at a position opposite to the main body, when the main body moves due to expansion, the pole can be synchronously moved by a large first displacement. When the pole is arranged at a position opposite to the gap, even if the main body moves due to expansion, the second displacement (smaller) of the pole driven by the main body to move will be smaller than the first displacement, so that the displacement of the pole is small, which to some extent avoids the disconnection between the pole and the tab due to the large displacement of the pole.

[0077] In some embodiments, the battery cell includes a pressure relief mechanism arranged on one of the two second side walls and the two third side walls, and the pressure relief mechanism is used to crack when the internal pressure of the battery cell exceeds a pressure threshold.

[0078] In the embodiments of the present application, the pressure relief mechanism is arranged on the surface of the shell other than the first side wall, and when the internal pressure of the battery cell exceeds the threshold, the pressure relief mechanism cracks before other walls of the shell, releasing the internal pressure, thereby avoiding the risk of cracking of the first side wall when the internal pressure of the battery cell is too large, reducing the influence of the large internal pressure of the battery cell on the pole part, and further reducing the safety risk.

[0079] In some embodiments, the battery device includes a sampling member which is directly in contact with the pole part to collect parameter information of the corresponding battery cell.

[0080] In the embodiments of the present application, the sampling member is directly in contact with the pole part, which improves the accuracy and synchronism of collecting the parameter information of the battery cell.

[0081] In some embodiments, the contact manner of the sampling member and the pole column part includes at least one of the following:

[0082] The sampling member is in contact with at least one of the two connected pole column parts in the axial direction of the pole column part;

[0083] The sampling member is in contact with at least one of the two connected pole column parts in the circumferential direction of the pole column part;

[0084] The sampling member is in contact with at least one of the two connected pole column parts in the radial direction of the pole column part.

[0085] In the embodiments of the present application, the sampling member can be in contact with the pole column part in at least one of the axial, circumferential and radial directions of the pole column part, realizing the electrical connection between the sampling member and the pole column part, so as to provide a flexible sampling connection scheme for different pole column connection manners, and the arrangement of the sampling member is more flexible, which to some extent alleviates the space limitation on the sampling member.

[0086] In some embodiments, the electrical connection column includes a connection column body and a sampling part, the connection column body is respectively inserted with the pole column parts of two adjacent battery monomers, and the sampling part is arranged on the connection column body and forms a sampling part.

[0087] In the embodiments of the present application, the sampling part and the connection column body are arranged through the electrical connection column, which improves the integration degree of components, reduces the number of parts, and is beneficial to improve the assembly efficiency. At the same time, the gap between the sampling part and the connection column body is reduced, so as to reduce the heat generation in the process of collecting the parameter information of the battery monomer, and to some extent prevent the sampling part from overheating and damage.

[0088] In some embodiments, the sampling part is integrally formed with the connection column body; or the sampling part is sleeved on the outside of the connection column body; and the two sides of the sampling part are respectively in abutment with the two pole column parts in electrical connection.

[0089] In the embodiments of the present application, the sampling part is integrally formed with the connection column body, which is beneficial to reduce or avoid the gap formed by the connection of the connection part and the connection column, so as to reduce the internal resistance of the sampling part, and further reduce the signal loss of the parameter information, and improve the accuracy of the parameter information of the battery monomer.

[0090] In other embodiments, the sleeving manner is beneficial to the assembly of the sampling part and the connection column body, and the two sides of the sampling part are respectively in abutment with the two pole column parts in electrical connection, so that the sampling part can collect the parameter information of the corresponding two battery monomers.

[0091] In some embodiments, the sampling part comprises a connecting structure and a sleeving structure, the sleeving structure is matched with the connecting structure, the sleeving structure is sleeved on the outside of the connecting column body, the pole column part comprises a first pole column and a second pole column with opposite polarities, and the two side surfaces of the sleeving structure are respectively abutted with the first pole column and the second pole column; the connecting structure is connected with the output line of the sampling.

[0092] In the embodiments of the present application, the two side surfaces of the sleeving structure are respectively abutted with the first pole column and the second pole column, which is beneficial to improve the connection reliability of the sleeving structure and the first pole column and the second pole column. The parameter information of the battery monomer is transmitted to the output line through the connecting structure, and the output line can conveniently transmit the parameter information of the battery monomer to the control unit.

[0093] In some embodiments, the sleeving structure comprises a sleeving plate, the second through hole is formed in the sleeving plate, and the sleeving plate is sleeved on the plug-in part through the second through hole.

[0094] In the embodiments of the present application, the two side surfaces of the sampling part are respectively abutted with the first pole column and the second pole column, the sampling part can be connected with the first pole column and the second pole column in a way of end surface contact, so that the sampling part can collect the parameter information of the battery monomer corresponding to the first pole column and the parameter information of the battery monomer corresponding to the second pole column. In addition, the sleeving manner is also convenient for the assembly of the sampling part and the plug-in part.

[0095] In some embodiments, the number of the sleeving plates is two, and the two sleeving plates are arranged at intervals on the connecting structure, one of the two sleeving plates is abutted with the second pole column, and the other of the two sleeving plates is abutted with the first pole column.

[0096] In the embodiments of the present application, the two sleeving plates are arranged at intervals on the connecting structure, one of the two sleeving plates is abutted with the first pole column, and the other of the two sleeving plates is abutted with the second pole column, so that the abutment of the sleeving plate and the pole column ensures the effective contact of the sleeving plate and the pole column to a certain extent, and the reliability of the sampling part is improved to a certain extent.

[0097] In some embodiments, the sleeving structure further comprises an elastic pad arranged on one side of the sleeving plate, the elastic pad is provided with a through hole matched with the second through hole, and the sleeving plate and the elastic pad are sleeved on the plug-in part through the second through hole and the through hole; the elastic pad is abutted with the first pole column, and the side of the sleeving part away from the elastic pad is abutted with the second pole column.

[0098] In the embodiments of the present application, the elastic pad is abutted with the first pole column, and the side of the sleeving part away from the elastic pad is abutted with the second pole column, so that the elastic pad is located between the sleeving plate and the first pole column in a way of interference clamping, and the elastic pad is in a compressed state. The elastic pad can apply a pressure to the sleeving plate, and the pressure can realize the effective contact of the sleeving plate and the second pole column.

[0099] In some embodiments, the periphery of the second through hole of the sleeving plate is provided with an elastic ring, and the sleeving plate is sleeved on the insertion part through the elastic ring.

[0100] In the embodiments of the present application, the sleeving plate is sleeved on the second pole column through the elastic ring, the elastic ring can absorb certain vibration, and in the case of vibration impact on the battery monomer or the electrical device, the effective contact between the sampling member and the second pole column can also be maintained to a certain extent.

[0101] In some embodiments, the battery device further comprises a box body, a first expansion beam and a second expansion beam; the first expansion beam and the second expansion beam are arranged at intervals and jointly form a battery compartment with the box body, and a plurality of battery monomers are sequentially arranged in the battery compartment, and the battery monomers at the ends are respectively matched with the first expansion beam and the second expansion beam.

[0102] In the embodiments of the present application, the battery compartment is jointly formed by the first expansion beam, the second expansion beam and the box body, a plurality of battery monomers are sequentially arranged in the battery compartment, and the battery monomers at the ends are respectively matched with the first expansion beam and the second expansion beam, so that the first expansion beam and the second expansion beam can provide better constraint force for the expansion of the battery monomers while saving installation space and improving energy density.

[0103] In other embodiments, the battery device further comprises a box body, a module shell and a mounting beam, a plurality of battery monomers are arranged in the module shell, and the module shell is mounted in the box body through the mounting beam. In the embodiments of the present application, the module shell provides a stable and reliable mounting space for the battery monomers.

[0104] In a second aspect, the present application provides a battery monomer, comprising a shell, an electrode assembly and a pole column part, wherein the shell comprises two first side walls opposite to each other; the electrode assembly is arranged in the shell, and the electrode assembly comprises a tab arranged close to the edge of the first side wall; the pole column part is arranged close to the edge of the first side wall where the tab is located and is electrically connected with the tab, the pole column part is formed with an insertion part protruding relative to the first side wall or an insertion slot recessed towards the inside of the shell, and the insertion part or the pole column part insertion slot is inserted with an electrical connection column to electrically connect the battery monomer with the electrical connection column.

[0105] The battery monomer is plugged with the electric connection column through the plug-in part or plug-in slot formed in the first side wall edge, and then the electric connection with another battery monomer is realized, which replaces the connection mode of realizing the electric connection of the battery monomers by welding the copper bar with the pole column part of the adjacent battery monomers, so as to improve the defects such as virtual welding and burst hole caused by the welding of the copper bar with the pole column part, and improve the reliability of the electric connection between the battery monomers. By connecting the pole column parts of the adjacent battery monomers through the electric connection column, the shape of each pole column part can be uniformly regulated to ensure the manufacturing efficiency of the pole column part, and the distance between the adjacent battery monomers can be adjusted through the intermediate electric connection column to adapt to the expansion of the battery monomers, so as to further improve the reliability of the electric connection between the battery monomers.

[0106] In a third aspect, the present application provides a power utilization device comprising the battery device or the battery monomer in the above embodiments, and the battery device or the battery monomer is used to provide electric energy.

[0107] The power utilization device of the embodiments of the present application has all the beneficial effects of the battery device or the battery monomer in the above embodiments.

[0108] In some embodiments, the power utilization device is a vehicle, the battery device comprises a box body, and the plurality of battery monomers are arranged in the box body; and the chassis of the vehicle constitutes the upper cover of the box body.

[0109] In the embodiments of the present application, the chassis of the vehicle constitutes the upper cover of the box body, so that the connection structure is saved and the structural compactness of the interior of the vehicle is improved.

[0110] The above description is only a summary of the technical solutions of the present application, in order to enable the technical means of the present application to be implemented according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0111] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments and are not meant to limit the present application. Moreover, the same reference numerals in the drawings indicate the same or similar elements. In the drawings:

[0112] FIG. 1 is a structural schematic view of a vehicle according to some embodiments of the present application;

[0113] FIG. 2 is an exploded structural schematic view of a battery device according to some embodiments of the present application;

[0114] FIG. 3 is an exploded structural schematic view of a battery monomer according to some embodiments of the present application;

[0115] Figure 4 is a schematic view of a battery cell and an electrical connecting post according to some embodiments of the present application;

[0116] Figure 5 is a schematic view of a battery cell and an electrical connecting post according to some embodiments of the present application, from a left side perspective;

[0117] Figure 6 is a schematic view of a battery cell and an electrical connecting post according to some embodiments of the present application, from a top perspective;

[0118] Figure 7 is a zoomed-in view of portion A of Figure 5;

[0119] Figure 8 is a schematic view of a battery cell according to some embodiments of the present application;

[0120] Figure 9 is a schematic view of a battery cell according to some embodiments of the present application, from a front perspective;

[0121] Figure 10 is a schematic view of a cross-section of the battery cell of Figure 9 along direction B-B;

[0122] Figure 11 is a schematic view of an electrical connecting post according to some embodiments of the present application;

[0123] Figure 12 is a schematic view of a battery cell and an electrical connecting post according to some other embodiments of the present application;

[0124] Figure 13 is a schematic view of a battery cell and an electrical connecting post according to some other embodiments of the present application, from a top perspective;

[0125] Figure 14 is a schematic view of a battery cell according to some embodiments of the present application, from a perspective view;

[0126] Figure 15 is a schematic view of a battery cell according to some embodiments of the present application, from a left side perspective;

[0127] Figure 16 is a schematic view of an electrical connecting post according to some embodiments of the present application;

[0128] Figure 17 is a schematic view of a battery cell and an electrical connecting post according to some further embodiments of the present application;

[0129] Figure 18 is a schematic view of a partial cross-section of a battery device according to some embodiments of the present application;

[0130] Figure 19 is a schematic view of a partial cross-section of a battery device according to some embodiments of the present application;

[0131] Figure 20 is a schematic view of a partial cross-section of a battery device according to some embodiments of the present application;

[0132] Figure 21 is a schematic view of a sampling portion according to some embodiments of the present application;

[0133] Figure 22 is a schematic view of a partial cross-section of a battery device according to some embodiments of the present application;

[0134] Fig. 23 is a second schematic view of a sampling portion according to some embodiments of the present application;

[0135] Fig. 24 is a fifth partial cross-sectional schematic view of a battery device according to some embodiments of the present application;

[0136] Fig. 25 is a third schematic view of a sampling portion according to some embodiments of the present application;

[0137] Fig. 26 is a sixth partial cross-sectional schematic view of a battery device according to some embodiments of the present application;

[0138] Fig. 27 is a fourth schematic view of a sampling portion according to some embodiments of the present application;

[0139] Fig. 28 is a seventh partial cross-sectional schematic view of a battery device according to some embodiments of the present application;

[0140] Fig. 29 is a fifth schematic view of a sampling portion according to some embodiments of the present application;

[0141] Fig. 30 is a structural schematic view of a battery cell according to some other embodiments of the present application;

[0142] Fig. 31 is a structural schematic view of the battery cell of Fig. 30 from a top perspective.

[0143] The reference numerals in the detailed description are as follows: 1000- vehicle, 200- controller, 300- motor, 100- battery device, 10- box body, 11- first part, 12- second part, 13- first expansion beam, 14- second expansion beam, 15- battery compartment, 16- cross beam, 17- longitudinal beam; 20- battery cell, 21- pole post portion, 211- first insertion slot, 2112- slot bottom surface, 2113- slot inner peripheral surface, 2114- limiting hole, 212- second insertion portion, 213- third insertion slot, 214- third insertion portion, 22- pole post seat, 23- elastic member, 231- first end, 232- second end, 233- deformation portion, 24- conductive adhesive layer, 25- outer shell, 251- first side wall, 252- shell, 2521- opening, 253- end cover, 254- pressure relief mechanism, 255- second side wall, 256- third side wall, 257- accommodating groove, 27- first pole post, 28- second pole post; 30- electrical connection post, 31- first insertion portion, 32- body portion, 321- glue injection hole, 33- connection portion, 331- flow guide groove, 34- second insertion slot, 35- limiting member, 36- limiting groove, 37- fourth insertion portion, 38- fourth insertion slot; 39- connection post body, 391- insertion portion, 392- insertion slot, 40- sampling member, 41- sampling portion, 42- output line, 43- sleeving portion, 432- sleeving plate, 44- connection structure, 441- sleeving structure, 442- second through hole, 45- elastic pad, 451- through hole, 70- elastic ring. DETAILED DESCRIPTION

[0144] The embodiments of the present application will be described in detail below with reference to the drawings. The following examples are only used to more clearly illustrate the technical scheme of the present application, and therefore only serve as examples, but cannot be used to limit the protection scope of the present application.

[0145] 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 belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application; the terms "comprising," "comprises" and "including" as used herein are synonymous with and meant to have the same meaning as the term "including"; the term "coupled" as used herein means the joining of two members together with one or more intervening members.

[0146] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0147] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, or necessarily alternatives to other embodiments. It will be explicitly and implicitly appreciated by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0148] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0149] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0150] In the description of the embodiments of the present application, the orientation or positional relationship indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0151] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, can also be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0152] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging of the battery cell.

[0153] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc. The embodiments of the present application are not limited thereto.

[0154] In the embodiments of the present application, the battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. The separator is arranged between the negative electrode and the positive electrode. During the charging and discharging process of the battery cell, active ions (such as lithium ions) are inserted and extracted between the positive electrode and the negative electrode. The separator arranged between the positive electrode and the negative electrode can prevent the positive and negative electrodes from short-circuiting, and at the same time allow the active ions to pass through.

[0155] In the embodiments of the present application, the battery cell can include a shell. The shell can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc. In some embodiments, the shell can be a sealed structure, or can be a non-sealed structure. As an example, when the shell is a non-sealed structure, the shell serves to protect the electrode assembly, and the shell and the electrode assembly further include a sealing bag for packaging the electrode assembly and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum-plastic film. When the shell is a sealed structure, it is used to package the electrode assembly, the electrolyte and other components.

[0156] 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, the prismatic battery cell includes a square battery cell, a blade battery cell, a multi-prismatic battery cell, for example, a hexagonal battery cell, etc., and the present application is not particularly limited.

[0157] In some embodiments, the housing includes an end cap and a shell, the shell is provided with an opening, and the end cap covers the opening. The shell can be provided with one or more openings. The end cap can also be provided with one or more openings.

[0158] In some embodiments of the present application, at least one electrode terminal (pole) is provided on the housing, and the electrode terminal is electrically connected with the tab. The electrode terminal can be directly connected with the tab, or indirectly connected with the tab through a current collecting member. The electrode terminal can be provided on the end cap or on the shell.

[0159] In the embodiments of the present application, the battery apparatus mentioned in the embodiments of the present application can include one or more battery cells, and the plurality of battery cells are connected in series, in parallel, or in a hybrid connection through a current collecting member.

[0160] In some embodiments, the battery apparatus can be a battery pack, and the battery pack includes a box body and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body.

[0161] As an example, the box body can include a first box body and a second box body. The first box body and the second box body are buckled to form a closed space inside the box body to accommodate the battery cell assembly. Here, closed means covered or closed, which can be sealed or unsealed. The first box body can be a top cover or a bottom plate.

[0162] As an example, the box body can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected with the frame, so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0163] In some embodiments, the box body can be part of the chassis structure of the vehicle. For example, part of the box body can be at least part of the floor of the vehicle, or part of the box body can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0164] The technical solutions described in the embodiments of the present application are applicable to various electric devices using battery cells, for example, mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles, ships, and spacecraft, etc., for example, spacecraft includes airplanes, rockets, space shuttles, and spaceships, etc.

[0165] At present, from the development of market situation, the application of power battery is more and more extensive. The power battery is not only applied to the energy storage power supply system of water power, fire power, wind power and solar power station, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment and aerospace and other fields. With the continuous expansion of the application field of power battery, the demand of its market is also increasing.

[0166] In the related art, the battery pack includes a plurality of battery monomers, and two battery monomers are electrically connected by welding two pole columns and copper bars. However, the welding of copper bar and pole column is prone to defects such as false welding and burst hole, and in the process of use, it is often accompanied by vibration impact, and the bar piece will pull the welding mark of the bar piece and the pole column under the vibration impact, resulting in reduced reliability of the battery monomer.

[0167] In order to improve the defect problem caused by the welding of copper bar and pole column, the electric connection column can be inserted with the pole column of the adjacent battery monomer to realize the electrical connection of the adjacent battery monomers.

[0168] Specifically, in order to improve the reliability of the electrical connection between the battery monomers, the application embodiment provides a battery device, which includes a plurality of battery monomers and an electric connection column. The plurality of battery monomers are arranged along a first direction, and the battery monomers are provided with a pole column part. The electric connection column is inserted with the pole column parts of two adjacent battery monomers in the first direction respectively, so as to realize the electrical connection of the two adjacent battery monomers. Such design not only can replace the electrical connection mode of welding copper bar and pole column part, solve the defects such as false welding and burst hole, but also can adjust the distance between the adjacent battery monomers through the electric connection column to adapt to the expansion of the battery monomer, so as to improve the reliability of the electrical connection between the battery monomers.

[0169] The following embodiments are described with reference to a vehicle 1000 as an example of a power utilization device of an embodiment of the application for the convenience of description.

[0170] Please refer to FIG. 1, which is a structural schematic diagram of a vehicle 1000 provided by some embodiments of the application. The vehicle 1000 can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric vehicle, a hybrid electric vehicle or a range extended vehicle. The vehicle 1000 is internally provided with a battery device 100, which can be arranged at the bottom, head or tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000, for example, the battery device 100 can be used as the operating power supply of the vehicle 1000. The vehicle 1000 can also include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power demand of the vehicle 1000 during starting, navigation and driving.

[0171] In some embodiments of the present application, the battery device 100 can not only serve as the operating power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing the fuel or natural gas to provide driving power for the vehicle 1000.

[0172] Please refer to FIG. 2, which is an exploded view of the battery device 100 according to some embodiments of the present application. The battery device 100 includes a box 10 and a battery cell 20, and the battery cell 20 is contained in the box 10. The box 10 is used to provide a battery compartment 15 for the battery cell 20, and the box 10 can have various structures. In some embodiments, the box 10 can include a first part 11 (i.e., the upper cover of the box) and a second part 12, and the first part 11 and the second part 12 are covered with each other to jointly define the battery compartment 15 for containing the battery cell 20. The second part 12 can be a hollow structure with one end open, and the first part 11 can be a plate structure, which is covered on the open side of the second part 12 to jointly define the battery compartment 15 with the second part 12. The first part 11 and the second part 12 can also be hollow structures with one side open, and the open side of the first part 11 is covered on the open side of the second part 12. Of course, the box 10 formed by the first part 11 and the second part 12 can have various shapes, such as a cylinder, a cuboid, etc.

[0173] In the battery device 100, the battery cell 20 can be multiple, and the multiple battery cells 20 can be connected in series, in parallel, or in a mixed connection, where the mixed connection means that some of the multiple battery cells 20 are connected in series and some are connected in parallel. The multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed connection, and then the whole of the multiple battery cells 20 is contained in the box 10. Of course, the battery device 100 can also be that the multiple battery cells 20 are first connected in series, in parallel, or in a mixed connection to form a battery module, and then multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, which is contained in the box 10. The battery device 100 can also include other structures, for example, the battery device 100 can also include a current collecting component (an electrical connection column) for realizing the electrical connection between the multiple battery cells 20.

[0174] Please refer to FIG. 3, which is an exploded structural schematic diagram of the battery cell 20 according to some embodiments of the present application. The battery cell 20 refers to the smallest unit that constitutes the battery device 100.

[0175] According to some embodiments of the present application, referring to FIGS. 4-7, the present application provides a battery device 100 comprising a plurality of battery cells 20 and a plurality of electric connection posts 30, wherein the plurality of battery cells 20 are arranged along a first direction, and each battery cell 20 is provided with a pole post part 21; in the first direction, each electric connection post 30 is inserted into the pole post parts 21 of two adjacent battery cells 20 to electrically connect the two adjacent battery cells 20.

[0176] Optionally, in FIGS. 4-7, the first direction is the front-rear direction, and the first direction is perpendicular to the left-right direction and the up-down direction. It can be understood that in other embodiments, the first direction is not limited to the front-rear direction. FIG. 5 is a structural schematic diagram of the battery cell and the electric connection post in the left view angle according to some embodiments of the present application; FIG. 6 is a structural schematic diagram of the battery cell and the electric connection post in the top view angle according to some embodiments of the present application; in FIGS. 4-7, the dotted line indicates the perspective structure.

[0177] Specifically, the electric connection post 30 is inserted into the pole post parts 21 of two battery cells 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 electric connection post 30 to achieve the electrical connection of the two battery cells 20. The electric connection post 30 and the pole post part 21 are matched in shape and size. For example, the pole post part 21 is in a strip shape, and the electric connection post 30 is in a strip structure matched with the size of the pole post part 21. The electric connection post 30 and the pole post can be connected in a mortise and tenon type insertion manner.

[0178] Optionally, the pole post part 21 is arranged at the end of the battery cell 20, for example, the pole post part 21 can be arranged at any end of the battery cell 20 in the up-down direction, the left-right direction, the front-rear direction, etc. as shown in the figure. The pole post part 21 can output the positive pole or the negative pole of the battery cell 20. The pole post parts 21 outputting the positive pole and the negative pole can be arranged on both sides of the battery cell 20 along the first direction. In other examples, the pole post parts 21 outputting the positive pole and the negative pole can also be arranged on the same side surface of the battery cell 20.

[0179] For example, referring to FIGS. 8 and 14, two pole post parts 21 are arranged on the front surface and the rear surface of the battery cell 20 along the first direction. In this embodiment, the pole post part 21 arranged on the front surface of the battery cell 20 can form a positive pole post or a negative pole post, and the pole post part 21 arranged on the rear surface of the battery cell 20 is opposite in polarity to the pole post part 21 arranged on the front surface. Thus, referring to FIGS. 4 and 12, two battery cells 20 connected by the electric connection post 30 and the pole post part 21 along the front-rear direction can be connected in series.

[0180] Optionally, the pole portions 21 are arranged on the front and back surfaces of the battery monomers 20 opposite in the first direction, and the pole portions 21 are arranged close to at least one side edge of the front and back surfaces of the battery monomers 20. For example, two pole portions 21 are arranged on the upper side edges of the front and back surfaces of the battery monomers 20 respectively. For another example, the pole portions 21 can be arranged on two or more side edges different from the front and back surfaces.

[0181] In some other embodiments, the number of the pole portions 21 can also be more than two.

[0182] Optionally, the pole portions 21 of two battery monomers 20 adjacent in the first direction are arranged opposite in the first direction. The plurality of battery monomers 20 are sequentially connected in the first direction by the plurality of electric connection columns 30.

[0183] Optionally, the electric connection column 30 is made of metal material with good electrical conductivity.

[0184] In the technical scheme of the embodiments, on the one hand, the electrical connection of the two battery monomers 20 is realized by the insertion of the two battery monomers 20 and the electric connection column 30, which replaces the connection mode of welding the copper bar with the pole portions 21 of the adjacent battery monomers 20 to realize the electrical connection of the battery monomers 20, so as to improve the defects such as virtual welding and burst hole caused by the welding of the copper bar and the pole portions 21, thereby improving the reliability of the electrical connection between the battery monomers 20. On the other hand, the pole portions 21 of the adjacent battery monomers 20 are connected by the electric connection column 30, which, compared with the direct insertion of the pole portions 21 of the adjacent battery monomers 20, not only can unify and standardize the shape of each pole portion 21 to ensure the manufacturing efficiency of the pole portions 21, but also can facilitate the adjustment of the distance between the adjacent battery monomers 20 through the intermediate electric connection column 30 to adapt to the expansion of the battery monomers 20, thereby further improving the reliability of the electrical connection between the battery monomers 20. In addition, the electric connection column 30 is inserted with the pole portions 21 to form the electronic path of the battery device 100, which can reduce the welding of the pole of the battery monomer 20, so that the battery monomer 20 can be disassembled and replaced, and the maintainability is higher.

[0185] Referring to FIGS. 7-10, in some embodiments, the pole portion 21 is formed with a first insertion slot 211, the electric connection column 30 is formed with a first insertion portion 31, and at least part of the first insertion portion 31 is inserted into the first insertion slot 211 to be electrically connected and matched with the first insertion slot 211.

[0186] Optionally, the pole portion 21 can form the first insertion slot 211 with a cross section in the shape of a circle, an ellipse, a triangle, a square, a polygon, a racetrack or other irregular shape. Optionally, the cross-sectional shape of the first insertion portion 31 is a circle, an ellipse, a triangle, a square, a polygon, a racetrack or other irregular shape adapted to the first insertion slot 211.

[0187] Optionally, the pole column part 21 extends along the length direction of the side of the battery monomer 20 close to itself, forming a long strip shape. The electric connection column 30 is a column close in length to the pole column part 21. Further, the first plug-in slot 211 and the first plug-in part 31 both extend along the length direction of the pole column part 21, forming a long strip shape. Such a setting increases the connection area, which is particularly beneficial to dispersing stress in the length direction of the side of the battery monomer 20, ensuring the structural stability of the connection between the pole column part 21 and the electric connection column 30.

[0188] Optionally, the electric connection column 30 can also be a short and thick column or other composite structure. The shape and size of the first plug-in part 31 are adapted to the shape and size of the electric connection column 30.

[0189] Optionally, the pole column part 21 includes a pole column seat 22, and the first plug-in slot 211 is recessed towards the inside of the battery monomer 20 relative to the pole column seat 22. Optionally, the first plug-in slot 211 includes a slot bottom surface 2112 and a slot inner circumferential surface 2113, the slot bottom surface 2112 being the deepest part of the first plug-in slot 211 in the recess direction, and the slot inner circumferential surface 2113 being connectable to the pole column seat 22 and the slot bottom surface 2112. Further, the first plug-in slot 211 is recessed in the first direction, and the slot bottom surfaces 2112 of the two first plug-in slots 211 located on the front and back sides of the battery monomer 20 face each other in the first direction, and the slot inner circumferential surfaces 2113 surround the first plug-in slot 211 in the up-down direction and the left-right direction.

[0190] The first plug-in part 31 is a protruding structure adapted to the first plug-in slot 211. The first plug-in part 31 is inserted into the first plug-in slot 211, and the top end of the first plug-in part 31 in the first direction is accommodated in the first plug-in slot 211, and the end surface thereof can abut against the slot bottom surface 2112.

[0191] In the embodiments of the present application, the electrical connection between the pole column part 21 and the electric connection column 30 is achieved by inserting the first plug-in part 31 into the first plug-in slot 211, which is relatively simple to operate and relatively stable in connection. At the same time, the two battery monomers 20 that have completed electrical connection can be exempted from welding cooperation, thereby avoiding the problem that the electrode assembly is easily damaged when the pole column part 21 is disassembled at the welding position.

[0192] In some embodiments, the pole column part 21 protrudes from the surface of the battery monomer 20, and the part protruding from the pole column part 21 is formed with the first plug-in slot 211 recessed towards the inside of the battery monomer 20.

[0193] Referring to FIGS. 8-10, in other embodiments, the first plug-in slot 211 is recessed towards the inside of the battery monomer 20 at the surface of the battery monomer 20.

[0194] For the convenience of description, the inner side and the outer side of the battery monomer 20 are distinguished by the surface of the battery monomer 20 where the pole post part 21 is located. Alternatively, in some embodiments, the pole post part 21 protrudes from the surface of the battery monomer 20 and is at least partially located on the outer side of the battery monomer 20. The pole post seat 22 is located on the outer side of the battery monomer 20 and at a distance from the surface of the battery monomer 20, the groove bottom surface 2112 of the first plug-in slot 211 can be located on the inner side of the battery monomer 20, and the groove inner peripheral surface 2113 of the first plug-in slot 211 is partially located on the inner side of the battery monomer 20 and partially located on the outer side of the battery monomer 20; the groove bottom surface 2112 can also be located on the outer side of the battery monomer 20, and the groove inner peripheral surface 2113 is entirely located on the outer side of the battery monomer 20.

[0195] In the embodiments of the present application, the pole post part 21 protrudes from the surface of the battery monomer 20, thereby reducing the influence of damage to the pole post part 21 on the internal electrode assembly and other structures of the battery monomer 20. In addition, in the case where the pole post part 21 is formed separately from the battery monomer 20, it is convenient to manufacture and assemble.

[0196] Alternatively, in other embodiments, as shown in FIG. 10, the pole post seat 22 is connected to the surface of the battery monomer 20, and the groove bottom surface 2112 and the groove inner peripheral surface 2113 of the first plug-in slot 211 are both located inside the battery monomer 20.

[0197] In the embodiments of the present application, the first plug-in slot 211 is recessed from the surface of the battery monomer 20 to the inside of the battery monomer 20, so that the electric connection column 30 is directly inserted into the inner side of the surface of the battery monomer 20, the pole post part 21 is not easy to deform in the case of collision, extrusion, pulling and the like, and the plug-in structure of the first plug-in slot 211 and the electric connection column 30 is relatively stable.

[0198] Referring to FIGS. 4-7, in some embodiments, both of the pole post parts 21 directly electrically connected by the electric connection column 30 are formed with the first plug-in slot 211; the electric connection column 30 is formed with the first plug-in part 31 on both sides along the first direction; and the electric connection column 30 is respectively plugged with the first plug-in slot 211 at the corresponding positions on both sides along the first direction. As shown in FIGS. 4-7, the first direction is the front-rear direction.

[0199] Specifically, in combination with FIG. 11, the electrical connecting column 30 includes a front end surface and a rear end surface opposite in the first direction, the front end surface being an end surface of the first plug-in part 31 on the front side of the electrical connecting column 30, and the rear end surface being an end surface of the first plug-in part 31 on the rear side of the electrical connecting column 30. The front end surface is accommodated in the first plug-in groove 211 on the front side of the electrical connecting column 30, and the rear end surface is accommodated in the first plug-in groove 211 on the rear side, and the front end surface of the first plug-in part 31 abuts against the groove bottom surface 2112 of the first plug-in groove 211 in front of the electrical connecting column 30, and the rear end surface of the first plug-in part 31 abuts against the groove bottom surface 2112 of the first plug-in groove 211 behind the electrical connecting column 30. Thus, among the plurality of battery monomers 20 arranged in the first direction, one electrical connecting column 30 is inserted between every two battery monomers 20, and the plurality of battery monomers 20 are sequentially connected front and back by the electrical connecting column 30, which is less in number than the battery monomers 20.

[0200] The peripheral surface of the first plug-in groove 211 can be in contact with the inner peripheral surface 2113 of the first plug-in groove 211, thereby increasing the electrical connection area and improving the overcurrent capacity.

[0201] Both of the two pole column parts 21 directly connected by the electrical connecting column 30 are formed with the first plug-in groove 211, and the electrical connecting column 30 is formed with the first plug-in part 31 on both sides in the first direction, and the electrical connecting column 30 is plugged into the first plug-in groove 211 on both sides in the first direction, respectively, so that the plurality of battery monomers 20 are sequentially connected in the first direction by being plugged into the electrical connecting column 30, and the connection reliability is high, and it is relatively convenient to disassemble and maintain.

[0202] Referring to FIG. 11, in some embodiments, the electrical connecting column 30 includes a body part 32 and a connecting part 33 connected to both sides of the body part 32, and the two connecting parts 33 each form a first plug-in part 31.

[0203] Specifically, as shown in FIG. 11, the first direction is the front-rear direction, and the two connecting parts 33 respectively protrude from the end surface of the body part 32 on both sides of the body part 32 in the first direction. Alternatively, one connecting part 33 is arranged on the front surface of the body part 32, and one connecting part 33 is arranged on the rear surface of the body part 32. The end surface of the connecting part 33 away from the body part 32 in the first direction abuts against the groove bottom surface 2112 of the first plug-in groove 211.

[0204] Optionally, in combination with FIG. 7, the dashed line in FIG. 7 indicates a perspective structure. The connecting portion 33 can be fully inserted 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, and the body portion 32 is exposed outside the first insertion slot 211. The body portion 32 is located between the two pole column portions 21 to which the electric connecting column 30 is inserted, and the thickness of the body portion 32 in the first direction can be approximately regarded as the distance between the two adjacent and insertion-connected battery monomers 20 along the first direction. Optionally, the connecting portion 33 can be partially inserted into the first insertion slot 211 in the first direction, and the end of the body portion 32 and the connecting portion 33 connected to the body portion 32 is exposed outside the first insertion slot 211.

[0205] The body portion 32 can be a cylinder, a cuboid, a square, a flat body, or other irregular blocks.

[0206] For example, referring to FIG. 11, the first direction is the front-rear direction, which is also the thickness direction of the body portion 32, and the left-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-right direction is an elongated racetrack shape. In this embodiment, the cross section of the connecting portion 33 along the left-right direction can match the cross section shape and size of the body portion 32, and the cross section of the connecting portion 33 can be a racetrack shape slightly smaller than the cross section of the body portion 32. The cross section size of the body portion 32 in the left-right direction is slightly larger than the cross section size of the connecting portion 33, which is beneficial to increase the flow area of the electric connecting column 30 and reduce the flow impedance.

[0207] In the embodiments of the present application, the electric connecting column 30 includes the body portion 32 and the connecting portions 33 connected to both sides of the body portion 32, and each of the two connecting portions 33 forms a first insertion portion 31. When the first insertion portions 31 on both sides of the electric connecting column 30 are respectively inserted with the pole column portions 21 of the two battery monomers 20, the body portion 32 improves the strength of the electric connecting column 30 itself and improves the mechanical properties such as compression resistance, tensile resistance, impact resistance, extrusion resistance, and wear resistance of the insertion structure.

[0208] Referring to FIGS. 7 and 11, in some embodiments, at least one of the first insertion slot 211 and the first insertion portion 31 is connected with an elastic member 23, which is elastically abutted between the slot wall of the first insertion slot 211 and the outer periphery of the first insertion portion 31 to prevent the first insertion portion 31 from being separated from the first insertion slot 211. The slot wall of the first insertion slot 211 includes the above-mentioned slot bottom surface 2112 and the slot inner periphery surface 2113.

[0209] Optionally, the elastic member 23 is arranged on the electric connection column 30, and at least one end of the elastic member 23 is fixedly connected with the first plug-in part 31. Further, the elastic member 23 is connected on the peripheral surface of the first plug-in part 31. The first plug-in part 31 is inserted into the first plug-in slot 211, and the elastic member 23 is extruded to generate elastic deformation and can provide elastic force to abut against the inner peripheral surface 2113 of the first plug-in slot 211.

[0210] Optionally, the elastic member 23 is arranged in the pole column part 21 and can be located on the slot bottom surface 2112 and / or the inner peripheral surface 2113 of the first plug-in slot 211. For example, the elastic member 23 is arranged only on the inner peripheral surface 2113 of the first plug-in slot 211, and is extruded by the first plug-in part 31 when the first connection part 33 is inserted into the first plug-in slot 211 to elastically abut against the outer peripheral surface of the first plug-in part 31.

[0211] Optionally, the elastic member 23 is arranged on both the first plug-in slot 211 and the first plug-in part 31, and the elastic member 23 on the first plug-in slot 211 and the elastic member 23 on the first plug-in part 31 can be arranged in a staggered manner.

[0212] In the embodiments of the present application, the elastic member 23 elastically abuts between the slot wall of the first plug-in slot 211 and the outer peripheral surface of the first plug-in part 31 to prevent the first plug-in part 31 from being separated from the first plug-in slot 211, so that the elastic member 23 can maintain sufficient contact between the electric connection column 30 and the pole column part 21 under static and dynamic conditions such as vibration impact, thereby improving the reliability of the electrical connection between the battery monomers 20.

[0213] Referring to FIGS. 7 and 11, in some embodiments, the connecting direction of the two pole column parts 21 is the first direction, and the elastic member 23 is arranged in an arch shape in the second direction, and the second direction forms an angle with the first direction.

[0214] Specifically, as shown in the second direction, the elastic member 23 can be arranged on the upper surface and / or the lower surface of the first plug-in part 31, and the elastic member 23 can also be arranged on the upper and lower opposite slot walls of the first plug-in slot 211, and the elastic member 23 can be arranged in an arch shape upward or downward relative to the wall surface where the elastic member 23 is located. For example, the elastic member 23 is arranged on the upper surface and the lower surface of the first plug-in part 31, and the elastic member 23 is arranged in an arch shape upward relative to the upper surface of the first plug-in part 31 or in an arch shape downward relative to the lower surface of the first plug-in part 31 in a relaxed state.

[0215] It can be understood that the height of the elastic member 23 arching in the second direction when the electrical connecting post 30 is separated from the pole post part 21 is greater than the gap width when the peripheral surface of the first plug-in part 31 is plugged with the slot wall of the first plug-in slot 211. When the first plug-in part 31 is inserted into the first plug-in slot 211 in the first direction, the slot wall of the first plug-in slot 211 presses the part of the elastic member 23 arching on the first plug-in part 31, or the outer peripheral surface of the first plug-in part 31 presses the part of the elastic member 23 arching on the first plug-in slot 211, the elastic member 23 is deformed so that the arching part is pressed down, abuts against the slot wall (or the outer peripheral surface of the first plug-in part 31) of the first plug-in slot 211 and exerts an elastic force on the abutting wall surface.

[0216] Optionally, the first direction and the second direction are perpendicular to each other, and the elastic force exerted by the elastic member 23 in the second direction is used to the greatest extent to prevent the first plug-in part 31 from being pulled out of the first plug-in slot 211.

[0217] In the embodiments of the present application, the connecting direction of the two pole post parts 21 is the first direction, the elastic member 23 is arranged to arch in the second direction, and the second direction forms an angle with the first direction, so that when the first plug-in part 31 is inserted into the first plug-in slot 211, the arching part of the elastic member 23 is deformed to be pressed down, and an elastic force in the second direction is exerted between the slot wall of the first plug-in slot 211 and the outer peripheral surface of the first plug-in part 31, so as to separate the two pole post parts 21 from the electrical connecting post 30.

[0218] Referring to FIGS. 7 and 11, in some embodiments, the elastic member 23 includes a first end 231 and a second end 232 fixed to the first plug-in part 31, and a deformed part 233 between the first end 231 and the second end 232, the first end 231 and the second end 232 are opposite in the first direction, the deformed part 233 is separated from the surface of the first plug-in part 31 and arches in the second direction, and the elastic member 23 is configured to deform close to the surface of the first plug-in part 31 during the engagement of the first plug-in part 31 and the first plug-in slot 211.

[0219] Optionally, the elastic member 23 is in a strip structure, and the first end 231 and the second end 232 are two ends in the length direction of the elastic member 23. The first end 231 and the second end 232 are fixed to the outer peripheral surface of the first plug-in part 31, the first end 231 can be fixed to the root part where the connecting part 33 meets the main body 261, and the second end 232 can be fixed to the top end of the connecting part 33 in 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 member 23 in the relaxed state, and the deformed part 233 arches relative to the outer peripheral surface of the first plug-in part 31.

[0220] Optionally, the elastic member 23 can also be a sheet-shaped, thin plate-shaped, solid or hollow spherical, hemispherical, conical structure or other irregular structure with two ends fixed and a protruding middle part. The elastic member 23 can be a spring, a spring, an elastic band, etc.

[0221] In the process of inserting the first insertion part 31 into the first insertion slot 211, the second end 232, the deformation part 233 and the first end 231 enter the first insertion slot 211 in sequence. Since the gap between the slot wall of the first insertion slot 211 and the first insertion part 31 is small, the first insertion slot 211 presses the deformation part 233 towards the peripheral surface of the first insertion part 31. The deformation part 233 deforms and generates an elastic force resisting the deformation trend, supporting and pressing the slot wall of the first insertion slot 211.

[0222] In the embodiments of the present application, by fixing the first end 231 and the second end 232 with the first insertion part 31, the deformation part 233 is separated from the first insertion part 31 and arches, so that the deformation part 233 is compressed and deformed in the process of engaging the first insertion part 31 with the first insertion slot 211, and the first end 231 and the second end 232 can fix the overall position of the elastic member 23, so that the deformation part 233 can stably resist the wall surface of the first insertion slot 211, prevent the first insertion part 31 from being pulled out of the first insertion slot 211, and ensure the reliable insertion of the electric connection column 30 and the pole part 21.

[0223] Referring to FIG. 7, in some embodiments, the slot wall of the first insertion slot 211 has a limiting hole 2114 matched with the deformation part 233. When the first insertion part 31 is inserted into the first insertion slot 211, at least part of the deformation part 233 extends into the limiting hole 2114 and abuts against the hole wall.

[0224] Optionally, the limiting hole 2114 is recessed in the slot wall of the first insertion slot 211 in the second direction, and the recessed depth of the limiting hole 2114 at both ends in the first direction is obviously smaller than the recessed depth in the middle.

[0225] Optionally, the maximum recessed depth of the limiting hole 2114 in the first direction is smaller than the height of the arching of the deformation part 233 in the state of disengaging from the first insertion slot 211, so that the deformation part 233 can be extruded by the hole wall to deform when extending into the limiting hole 2114.

[0226] Optionally, a plurality of elastic members 23 are arranged at intervals along the circumference of the first insertion part 31 on the peripheral surface of the first insertion part 31, and correspondingly, a plurality of limiting holes 2114 are arranged at intervals on the slot wall of the first insertion slot 211 in the direction surrounding the first insertion slot 211. The limiting hole 2114 corresponds to the number and position of the elastic member 23 one by one.

[0227] In the embodiments of the present application, the slot wall of the first plug-in slot 211 has a limiting hole 2114 matched with the deformed part 233. When the first plug-in part 31 is plugged into the first plug-in slot 211, at least part of the deformed part 233 extends into the limiting hole 2114 and abuts against the hole wall, thereby increasing the contact area when the first plug-in part 31 is plugged into the first plug-in slot 211, and further increasing the overcurrent area of the electrical connection column 30 and the pole column part 21. At the same time, the deformed part 233 and the limiting hole 2114 are engaged, which also improves the reliability of the first plug-in part 31 and the first plug-in slot 211.

[0228] Referring to FIGS. 7 and 11, in some embodiments, the circumferential surface of the connecting part 33 is formed with a flow guide groove 331, the body part 32 is formed with a glue injection hole 321, the flow guide groove 331 communicates with the glue injection hole 321; the battery device 100 further comprises a conductive glue layer 24, and the conductive glue of the conductive glue layer 24 is injected and conductively filled between the first plug-in slot 211 and the first plug-in part 31 through the glue injection hole 321 and the flow guide groove 331.

[0229] Specifically, the connecting part 33 on both sides of the body part 32 is formed with a flow guide groove 331, and the flow guide groove 331 is formed on the upper and lower surfaces of the connecting part 33. The glue injection hole 321 is formed on the surface of the body part 32 exposed outside the battery monomer 20 in the connected state of the body part 32 and the battery monomer 20.

[0230] Optionally, the upper surface of the body part 32 is formed with a glue injection hole 321, and the glue injection hole 321 extends from the upper surface of the body part 32 to the flow guide grooves 331 on the front and rear sides.

[0231] It can be understood that the first plug-in part 31 is inserted into the first plug-in slot 211, the body part 32 is located outside the first plug-in slot 211, and the glue injection hole 321 is arranged on the body part 32 and exposed outside the first plug-in slot 211. In the embodiments of the present application, the conductive glue can be injected through the glue injection hole 321 exposed outside the battery monomer 20 after the electrical connection column 30 and the battery monomer 20 are assembled, which is convenient to operate.

[0232] Optionally, the flow guide groove 331 is a small straight groove, and the flow guide groove 331 extends from the root of the connecting part 33 connected with the body part 32 to the end surface of the connecting part 33 away from the body part 32. Optionally, the flow guide groove 331 can also extend along an arc or a curve.

[0233] Optionally, the number of flow guide grooves 331 is multiple, and the multiple flow guide grooves 331 are arranged in a circumferential interval along the connecting part 33.

[0234] In the embodiments of the present application, the body part 32 forms the glue injection hole 321, the flow guide groove 331 communicates with the glue injection hole 321, the conductive glue is injected through the glue injection hole 321 and the flow guide groove 331 and filled between the first plug-in groove 211 and the first plug-in part 31 to form the conductive glue layer 24, so that the conductive glue layer 24 fills the cavity gap after the first plug-in part 31 and the first plug-in groove 211 are plugged in, connects the surface of the first plug-in part 31 and the groove wall of the first plug-in groove 211, thereby increasing the flow contact surface of the electric connection column 30 and the pole part 21 and improving the conductive performance.

[0235] Referring to FIG. 11, in some embodiments, one glue injection hole 321 communicates with at least two flow guide grooves 331 located on both sides thereof.

[0236] Specifically, the number of glue injection holes 321 is at least one, and in the case that there is only one glue injection hole 321, the glue injection hole 321 communicates with all the flow guide grooves 331.

[0237] Alternatively, the number of glue injection holes 321 is multiple, and the multiple glue injection holes 321 can be arranged in a row along the length direction of the body part 32. Alternatively, since the body part 32 is relatively flat, the multiple glue injection holes 321 can be arranged in a row along the length direction of the body part 32. Alternatively, in order to reduce the flow distance of the conductive glue, each glue injection hole 321 can be aligned with and communicate with one flow guide groove 331 on the left and one flow guide groove 331 on the right, respectively.

[0238] In the embodiments of the present application, by communicating the glue injection hole 321 with at least two flow guide grooves 331 located on both sides thereof, it is ensured that each flow guide groove 331 can be fully filled with conductive glue, thereby improving the glue injection efficiency.

[0239] Referring to FIG. 11, in some embodiments, the electric connection column 30 includes the body part 32 and the connecting part 33 connected to both sides of the body part 32, and each of the two connecting parts 33 forms one first plug-in part 31; a plurality of elastic members 23 are arranged on each first plug-in part 31.

[0240] Alternatively, the number of elastic members 23 is multiple, and the multiple elastic members 23 are arranged on the connecting parts 33 on both sides of the body part 32, respectively. On each connecting part 33, the elastic members 23 are arranged in a row along the circumference of the connecting part 33 (i.e., the first plug-in part 31).

[0241] Alternatively, along the circumference of the connecting part 33 (i.e., the first plug-in part 31), the flow guide grooves 331 and the elastic members 23 are alternately and spaced arranged.

[0242] In the embodiments of the present application, a plurality of elastic members 23 are arranged on each of the first plug-in portions 31 on both sides of the body portion 32, and the plurality of elastic members 23 are arranged at intervals, so as to improve the ability of the elastic members 23 to prevent the first plug-in portions 31 from being separated from the first plug-in grooves 211, thereby ensuring stable plugging.

[0243] In some embodiments, the connecting direction of the two pole column portions 21 is the first direction, the length extension direction of the pole column portion 21 and the electrical connection portion 33 is the third direction, and the third direction and the first direction form an included angle. In other embodiments, the connecting direction of the two pole column portions 21 is the first direction, the elastic member 23 is arranged in an arch shape in the second direction, the length extension direction of the pole column portion 21 and the electrical connection column 30 is the third direction, and the first direction, the second direction, and the third direction are perpendicular to each other.

[0244] Optionally, the third direction forms an included angle with the first direction greater than 0° and less than 90°.

[0245] Optionally, referring to FIGS. 7 and 11, the first direction, the second direction, and the third direction are perpendicular to each other, the first direction is the front-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-right direction as shown in the figure. The elastic member 23 is arranged in an arch shape upward or downward and abuts against the electrical connection column 30. Optionally, the plurality of elastic members 23 are arranged at intervals on the upper surface and / or the lower surface of the first plug-in portion 31 along the third direction.

[0246] In the embodiments of the present application, the connecting direction of the two pole column portions 21, the length extension direction of the pole column portion 21 and the electrical connection portion 33, and the arching direction of the elastic member 23 are perpendicular to each other, so that the abutment of the elastic member 23 between the outer periphery of the first plug-in portion 31 and the groove wall of the first plug-in groove 211 can maximally prevent the first plug-in portion 31 and the first plug-in groove 211 from being separated from each other.

[0247] Referring to FIGS. 12-15, in some embodiments, the electrical connection column 30 is formed with a second plug-in groove 34, the pole column portion 21 is formed with a second plug-in portion 212, and at least part of the second plug-in portion 212 is inserted into the second plug-in groove 34 to be electrically connected and matched with the second plug-in groove 34.

[0248] Optionally, the pole column portion 21 comprises a pole column seat 22, and the second plug-in portion 212 protrudes in a direction away from the battery monomer 20 relative to the pole column seat 22. The second plug-in groove 34 is a groove matched with the second plug-in portion 212, and the second plug-in groove 34 is formed by being recessed inward on the surface of the electrical connection column 30. The top end of the protruding second plug-in portion 212 is accommodated in the second plug-in groove 34, and the end face thereof can abut against the bottom wall of the recessed second plug-in groove 34. Optionally, the first direction is the front-back direction, the pole column portion 21 is arranged on the front and back sides of the battery monomer 20, and the second plug-in portion 212 protrudes along the first direction, and the second plug-in groove 34 is recessed along the first direction.

[0249] Optionally, the pole portion 21 can form a second insertion portion 212 in a cross-section shape of a circle, an ellipse, a triangle, a square, a polygon, or other irregular shape. The second insertion slot 34 has a cross-section shape of a circle, an ellipse, a triangle, a square, a polygon, a runway shape, or other irregular shape that is adapted to the second insertion portion 212.

[0250] Optionally, the electric connection column 30 is a long strip prism structure, the second insertion slot 34 extends along the length direction of the electric connection column 30 to form a long strip square slot, and the second insertion portion 212 forms a long strip protrusion that matches the size of the second insertion slot 34. Optionally, the second insertion slot 34 is a dovetail slot.

[0251] Optionally, the electric connection column 30 can also be a short thick prism, a column with a circular arc outer surface, or other composite structures. The shape and size of the second insertion slot 34 are adapted to the surface shape and size of the electric connection column 30 towards the battery monomer 20.

[0252] In the embodiments of the present application, the electric connection between the pole portion 21 and the electric connection column 30 is achieved by inserting the second insertion portion 212 into the second insertion slot 34, which is relatively simple to operate and stable in connection. Meanwhile, the two battery monomers 20 that have completed the electric connection can be exempted from welding cooperation, thereby avoiding the problem that the electrode assembly is easily damaged when the pole portion 21 is disassembled from the welding position.

[0253] In some embodiments, the pole portion 21 protrudes from the surface of the battery monomer 20, and the protruding part of the pole portion 21 forms the second insertion portion 212. In other embodiments, the pole portion 21 is recessed from the surface of the battery monomer 20 to the inside of the battery monomer 20, and the bottom wall of the pole portion 21 after being recessed protrudes in a direction away from the battery monomer 20 to form the second insertion portion 212. The protruding depth of the second insertion portion 212 is less than or equal to the recessed depth of the pole portion 21, and the circumferential dimension of the second insertion portion 212 is less than the circumferential dimension of the pole portion 21 after being recessed.

[0254] The inside and outside of the battery monomer 20 are distinguished based on the surface of the battery monomer 20 where the pole portion 21 is located. Referring to FIGS. 12-15, in some examples, the pole portion 21 protrudes from the surface of the battery monomer 20 or from the inside of the battery monomer 20 to the outside of the battery monomer 20, the part of the pole portion 21 that protrudes from the surface of the battery monomer 20 forms the second insertion portion 212, and the second insertion portion 212 is located on the outside of the battery monomer 20.

[0255] In the embodiments of the present application, the pole portion 21 protrudes from the surface of the battery monomer 20, thereby reducing the impact of damage to the pole portion 21 on the electrode assembly and other structures inside the battery monomer 20. In addition, in the case where the pole portion 21 is separately formed from the battery monomer 20, it is convenient to manufacture and assemble.

[0256] In some embodiments, the pole portion 21 is recessed from the surface of the battery cell 20 to the inside of the battery cell 20, and the bottom wall of the pole portion 21 after being recessed is protruded to form a second insertion portion 212 facing away from the battery cell 20, the protrusion depth of the second insertion portion 212 is less than or equal to the recess depth of the pole portion 21, and the second insertion portion 212 is located on the inside of the battery cell 20 and arranged in the recessed area formed by the pole portion 21. The electric connection column 30 can be partially inserted into the area where the pole portion 21 is recessed and clamped with the second insertion portion 212 on the inside of the battery cell 20 to accommodate the second insertion portion 212 in the second insertion slot 34.

[0257] In the embodiments of the present application, the pole portion 21 is recessed from the surface of the battery cell 20 to the inside of the battery cell 20, so that the electric connection column 30 is directly inserted into the inside of the surface of the battery cell 20, and the second insertion portion 212 and the second insertion slot 34 are inserted on the inside of the surface of the battery cell 20, thereby reducing external interference and improving the connection reliability of the electric connection column 30 and the battery cell 20.

[0258] Referring to FIGS. 12-16, in some embodiments, both of the pole portions 21 directly electrically connected by the electric connection column 30 are formed with the second insertion portion 212; the electric connection column 30 includes the body portion 32, and the body portion 32 is formed with the second insertion slot 34 on both sides along the first direction; and the electric connection column 30 is inserted with the second insertion portion 212 at the corresponding positions on both sides along the first direction.

[0259] Specifically, the body portion 32 includes the front side and the rear side opposite to each other along the first direction, the front side faces one of the battery cells 20 in front of the electric connection column 30, and the rear side faces another of the battery cells 20 behind the electric connection column 30. The second insertion slot 34 is recessed on the front and rear sides of the body portion 32, and optionally, one of the second insertion slots 34 is formed on the front side and another of the second insertion slots 34 is formed on the rear side. The opening 2521 of the second insertion slot 34 can occupy most of the area of the front side (or the rear side).

[0260] The rear surface of the battery cell 20 in front of the electric connection column 30 is provided with one of the pole portions 21 and one of the second insertion portions 212, and the second insertion portion 212 is accommodated in the second insertion slot 34 on the front side of the body portion 32. The front surface of the battery cell 20 behind the electric connection column 30 is provided with one of the pole portions 21 and another of the second insertion portions 212, and the second insertion portion 212 is accommodated in the second insertion slot 34 on the rear side of the body portion 32. Thus, among the plurality of battery cells 20 arranged along the first direction, one of the electric connection columns 30 is inserted between every two of the battery cells 20, and the plurality of battery cells 20 are connected in front and back by the electric connection columns 30 in a number less than the battery cells 20.

[0261] The top end surface of the second plug-in part 212 can abut against the bottom wall of the recessed second plug-in groove 34. The outer peripheral surface of the second plug-in part 212 can abut against the groove wall of the second plug-in groove 34 in the up-down direction and / or the left-right direction. In the embodiments of the present application, the electrical connection area can be increased, and the overcurrent capacity can be improved.

[0262] In the embodiments of the present application, the two pole column parts 21 directly electrically connected by the electrical connection column 30 are each formed with the second plug-in part 212, the electrical connection column 30 is formed with the second plug-in groove 34 on both sides in the first direction, and the electrical connection column 30 is plugged with the second plug-in part 212 at the corresponding positions on both sides in the first direction, respectively. Thus, the plurality of battery monomers 20 are sequentially connected in the first direction by being plugged with the electrical connection column 30, and the connection reliability is high, and the disassembly and maintenance are convenient.

[0263] Referring to FIGS. 12-16, in some embodiments, the body part 32 is formed with a glue injection hole 321, and the glue injection hole 321 communicates with the second plug-in groove 34.

[0264] Specifically, the glue injection hole 321 is formed on the surface of the body part 32 exposed outside the battery monomer 20 in the connected state of the body part 32 and the battery monomer 20. The second plug-in part 212 is plugged with the second plug-in groove 34, and the outer periphery of the second plug-in part 212 does not completely fit with the groove wall of the second plug-in groove 34, and there is a certain cavity and / or gap. Optionally, the glue injection hole 321 is formed on the upper surface of the body part 32, the second plug-in groove 34 is formed on the front and rear sides of the body part 32, and the glue injection hole 321 extends from the upper surface of the body part 32 to the flow guide groove 331 of the front and / or rear side of the body part 32.

[0265] In the embodiments of the present application, the body part 32 is formed with the glue injection hole 321, and the glue injection hole 321 communicates with the second plug-in groove 34, so that the conductive glue can flow into the second plug-in groove 34 through the glue injection hole 321 and fill the cavity gap after the first plug-in part 31 and the first plug-in groove 211 are plugged.

[0266] Referring to FIGS. 12-16, in some embodiments, the number of glue injection holes 321 is multiple, and the multiple glue injection holes 321 are arranged on the surfaces of the body part 32 opposite in the second direction, the second direction forms an angle with the first direction, the multiple glue injection holes 321 are arranged at intervals along the length extension direction of the body part 32, and one glue injection hole 321 communicates with one of the second plug-in grooves 34 on both sides.

[0267] Specifically, as shown in the embodiments of FIGS. 12-16, the second direction is the up-down direction, the first direction is the front-rear direction, the first direction is perpendicular to the first direction, and the length extension direction of the body part 32 is the left-right direction shown in the figure.

[0268] Optionally, two second insertion slots 34 are formed on the front surface and the rear surface of the body portion 32 respectively, and glue injection holes 321 are formed on the upper surface and / or the lower surface of the body portion 32. The glue injection hole 321 can pass through the upper end portion of the body portion 32 downwardly from the upper surface or the lower surface of the body portion 32 to the second insertion slot 34. The glue injection hole 321 can also pass through the upper and lower surfaces of the body portion 32 and communicate with the second insertion slot 34.

[0269] Optionally, the plurality of glue injection holes 321 can be arranged into two groups. One group of the glue injection holes 321 is close to the front surface of the body portion 32 and communicates with the second insertion slot 34 on the front surface of the body portion 32. The other group of the glue injection holes 321 is close to the rear surface of the body portion 32 and communicates with the second insertion slot 34 on the rear surface of the body portion 32. Optionally, the glue injection holes 321 in each group are arranged in a line along the length direction of the body portion 32, and the two groups of glue injection holes 321 are arranged side by side along the first direction.

[0270] Optionally, the plurality of glue injection holes 321 can also be arranged staggered in the first direction and / or the length direction of the body portion 32.

[0271] In the embodiments of the present application, by arranging the plurality of glue injection holes 321 along the length extension direction of the body portion 32, the glue injection holes 321 communicate with the at least one second insertion slot 34, so that the conductive glue is injected through the plurality of glue injection holes 321 and fills in the second insertion slot 34 quickly and sufficiently.

[0272] In some embodiments, the battery device 100 further comprises a conductive glue layer 24. The conductive glue of the conductive glue layer 24 is injected into the second insertion slot 34 through the glue injection hole 321 and fills between the second insertion slot 34 and the second insertion portion 212.

[0273] Optionally, after the second insertion portion 212 is inserted or partially inserted into the second insertion slot 34, the conductive glue is injected from the glue injection hole 321 to fill the cavity gap between the second insertion portion 212 and the second insertion slot 34 after the insertion, and solidifies to form the conductive glue layer 24.

[0274] In the embodiments of the present application, the conductive glue connects the slot surface of the second insertion slot 34 and the second insertion portion 212, thereby increasing the flow contact surface of the electrically connected column 30 and the pole column portion 21 and improving the conductive performance.

[0275] Referring to FIG. 15, in some embodiments, the width d of the second insertion portion 212 increases along the direction in which the second insertion portion 212 protrudes.

[0276] Specifically, the front-rear direction is the first direction, and the second insertion portion 212 is protruded from the surface of the battery monomer 20 in the first direction away from the battery monomer 20. The first direction is perpendicular to the up-down direction, and the width d of the second insertion portion 212 refers to the distance between the upper surface and the lower surface of the second insertion portion 212. The width d of the second insertion portion 212 gradually increases from the surface of the battery monomer 20 to the top end surface of the second insertion portion 212 away from the battery monomer 20, and the upper and lower surfaces of the second insertion portion 212 have a tendency to move away from each other from the surface of the battery monomer 20 to the top end of the second insertion portion 212 in the direction in which the second insertion portion 212 protrudes. Optionally, the spacing of the groove walls of the second insertion groove 34 in the up-down direction has a tendency to gradually increase from the groove opening to the bottom wall in the first direction.

[0277] It can be understood that the root width of the second insertion portion 212 connecting the battery monomer 20 is the smallest, and the top end surface width of the second insertion portion 212 protruding is the largest. Optionally, the second insertion portion 212 has the largest width at the position abutting the bottom wall of the recess of the second insertion groove 34.

[0278] Optionally, the upper surface and / or the lower surface of the second insertion portion 212 forms an included angle with the first direction, and an included angle is also formed between the upper and lower surfaces of the second insertion portion 212. Optionally, the upper surface and / or the lower surface of the second insertion portion 212 can be a flat surface, a curved surface, or a combination of curved and flat surfaces.

[0279] In the embodiments of the present application, the width of the second insertion portion 212 increases in the direction in which the second insertion portion 212 protrudes, and the second insertion portion 212 has the largest width at the top in the protruding direction, so that the top of the second insertion portion 212 is accommodated in the second insertion groove 34, which can to some extent hinder the second insertion portion 212 from being separated from the second insertion groove 34.

[0280] Referring to FIGS. 12 and 16, in some embodiments, the battery device 100 includes a limiting piece 35 arranged at at least one end of the length direction of the electric connection column 30, for stopping the second insertion portion 212 from sliding relative to the second insertion groove 34.

[0281] Specifically, the limiting piece 35 can be a limiting block, a limiting plate, a limiting pin, etc. The limiting piece 35 and the electric connection column 30 can be a split structure, and the limiting piece 35 and the electric connection column 30 can be detachably connected, so that at least one end of the second insertion groove 34 is open in the state that the limiting piece 35 and the electric connection column 30 are separated, facilitating the insertion of the electric connection column 30 and the pole portion 21. The limiting piece 35 can also form an integral structure with the electric connection column 30.

[0282] Optionally, the limiting piece 35 is arranged at one end of the length direction of the electric connection column 30. Optionally, the limiting piece 35 is arranged at both ends of the length direction of the electric connection column 30.

[0283] In the embodiments of the present application, the second insertion part 212 is stopped from sliding relative to the second insertion slot 34 by the limiting member 35 at at least one end of the length direction of the electric connection column 30, so that the insertion of the second insertion part 212 into the second insertion slot 34 is more secure, thereby further improving the connection stability of the electric connection column 30 and the battery monomer 20.

[0284] Referring to FIG. 16, in some embodiments, the electric connection column 30 forms a limiting slot 36 at at least one end of the length direction of the second insertion slot 34 and in communication with the second insertion slot 34, and the limiting member 35 is engaged with the limiting slot 36 and abuts against at least one end of the length direction of the second insertion part 212.

[0285] Optionally, the limiting slot 36 forms an opening 2521 towards a side different from the surface where the second insertion slot 34 is located, the limiting member 35 is inserted into the limiting slot 36 from the slot opening of the limiting slot 36, and the limiting slot 36 is partially accommodated in the end of the second insertion slot 34 to abut against the second insertion part 212 inserted into the second insertion slot 34. Optionally, one end of the length direction of the second insertion slot 34 is in communication with the limiting slot 36, and the other end is closed.

[0286] In the embodiments of the present application, the second insertion part 212 is stopped from sliding relative to the second insertion slot 34 by the limiting member 35 and the limiting slot 36, thereby preventing the second insertion part 212 from being displaced or even removed from the second insertion slot 34, and further improving the connection stability of the second insertion part 212 and the second insertion slot 34.

[0287] Referring to FIG. 17, the dashed line in FIG. 7 indicates a perspective structure. In some embodiments, one of the two pole parts 21 directly electrically connected by the electric connection column 30 is formed with a third insertion slot 213, and the other is formed with a third insertion part 214, one side of the electric connection part 33 is formed with a fourth insertion part 37, and the other side is formed with a fourth insertion slot 38, at least part of the fourth insertion part 37 extends into the third insertion slot 213 and is inserted with the third insertion slot 213; at least part of the third insertion part 214 extends into the fourth insertion slot 38 and is inserted with the fourth insertion slot 38.

[0288] Specifically, the two sides of the electric connection column 30 along the first direction are respectively inserted with the pole parts 21 of one battery monomer 20, that is, the two battery monomers 20 adjacent along the first direction are inserted with the two sides of the same electric connection column 30, thereby realizing the electrical connection of the two battery monomers 20. The two sides of the electric connection column 30 along the first direction are respectively formed with the fourth insertion part 37 and the fourth insertion slot 38, the fourth insertion part 37 can protrude relative to the side surface of the electric connection column 30, and the fourth insertion slot 38 is recessed relative to the other side surface of the electric connection column 30.

[0289] Optionally, in some embodiments, the first direction is the left-right direction, two battery monomers 20 adjacent along the first direction are respectively located at the left and right sides of the electric connecting column 30, the right side surface of the battery monomer 20 at the left side of the electric connecting column 30 is formed with a third insertion slot 213, and the left side of the electric connecting column 30 is formed with a fourth insertion part 37 which is matched with the third insertion slot 213 in shape and size. In this embodiment, the left side surface of the battery monomer 20 at the right side of the electric connecting column 30 is formed with a third insertion part 214, and the right side of the electric connecting column 30 is formed with a fourth insertion slot 38 which is matched with the third insertion part 214 in shape and size.

[0290] Optionally, each battery monomer 20 is respectively provided with a third insertion slot 213 and a third insertion part 214 at both sides in the first direction, the plurality of battery monomers 20 are arranged along the first direction, the electric connecting column 30 is inserted between each two adjacent battery monomers 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, so as to realize the connection of the plurality of battery monomers 20 in the first direction in turn.

[0291] In the embodiments of the present application, the fourth insertion slot 38 and the fourth insertion part 37 are respectively formed on both sides of the electric connecting column 30 in the form of recess and protrusion, so that one side of the electric connecting column 30 accommodates the third insertion part 214 and the other side is inserted into the third insertion slot 213, thereby facilitating the adjustment of the distance between the two adjacent battery monomers 20 to adapt to the expansion of the battery monomer 20, and further improving the reliability of the electrical connection between the battery monomers 20.

[0292] In some embodiments, the pole column part 21 formed with the third insertion slot 213 protrudes from the surface of the battery monomer 20, and the part protruding from the pole column part 21 is formed with the third insertion slot 213 which is recessed towards the inside of the battery monomer 20. In other embodiments, the third insertion slot 213 is recessed from the surface of the battery monomer 20 towards the inside of the battery monomer 20.

[0293] Specifically, the inside and outside of the battery monomer 20 are distinguished with the surface of the battery monomer 20 as the boundary. In some embodiments, the pole column part 21 protrudes from the surface of the battery monomer 20, the pole column part 21 and the third insertion slot 213 are located on the outside of the battery monomer 20, and the top end surface of the part protruding from the pole column part 21 is formed with the third insertion slot 213 which is recessed. The fourth insertion part 37 is inserted into the third insertion slot 213 and still located on the outside of the battery monomer 20. In the embodiments of the present application, the influence of the damage of the pole column part 21 on the electrode assembly and other structures inside the battery monomer 20 can be reduced. In addition, it is convenient to manufacture and assemble when the pole column part 21 and the battery monomer 20 are formed separately.

[0294] Referring to FIG. 17, in some embodiments, the third insertion groove 213 is recessed from the surface of the battery cell 20 to the inside of the battery cell 20, the pole portion 21 and the third insertion groove 213 are located on the inside of the battery cell 20, and the fourth insertion portion 37 is inserted into the third insertion groove 213 and also to the inside of the surface of the battery cell 20. In the embodiments of the present application, the pole portion 21 is not easily deformed in the case of collision, extrusion, pulling, etc., and the insertion structure of the first insertion groove 211 and the electrical connection column 30 is relatively stable.

[0295] In some embodiments, the pole portion 21 in which the third insertion portion 214 is formed protrudes from the surface of the battery cell 20, and the portion protruding from the pole portion 21 forms the third insertion portion 214. In other embodiments, the pole portion 21 in which the third insertion portion 214 is formed is recessed from the surface of the battery cell 20 to the inside of the battery cell 20, and the bottom wall of the pole portion 21 after being recessed protrudes in a direction away from the battery cell 20 to form the third insertion portion 214. The protruding depth of the third insertion portion 214 is less than or equal to the depth of the recessed pole portion 21, and the circumferential dimension of the third insertion portion 214 is less than the circumferential dimension of the recessed pole portion 21.

[0296] The inside and outside of the battery cell 20 are distinguished with respect to the surface of the battery cell 20 on which the pole portion 21 is located. In some embodiments, the pole portion 21 protrudes from the surface of the battery cell 20 or from the inside of the battery cell 20 to the outside of the battery cell 20, the portion of the pole portion 21 protruding from the surface of the battery cell 20 forms the third insertion portion 214, and the third insertion portion 214 is located on the outside of the battery cell 20. In the embodiments of the present application, the influence of damage to the pole portion 21 on the electrode assembly and other structures inside the battery cell 20 is reduced. In addition, in the case of separate molding of the pole portion 21 and the battery cell 20, it is convenient to mold and assemble.

[0297] In other embodiments, the pole portion 21 is recessed from the surface of the battery cell 20 to the inside of the battery cell 20, the third insertion portion 214 is located on the inside of the battery cell 20 and is arranged in the recessed area formed by the pole portion 21. The electrical connection column 30 can be partially inserted into the recessed area of the pole portion 21 and engaged with the third insertion portion 214 on the inside of the battery cell 20 to accommodate the third insertion portion 214 in the fourth insertion groove 38. In the embodiments of the present application, the third insertion portion 214 and the fourth insertion groove 38 are inserted on the inside of the surface of the battery cell 20, thereby reducing external interference and improving the connection reliability of the pole portion 21 and the electrical connection column 30.

[0298] Referring to FIG. 17, in some embodiments, the electric connecting column 30 comprises a body part 32, the body part 32 is connected with a fourth inserting part 37 on one side of the body part 32 along the first direction, and the other side of the body part 32 is formed with a fourth inserting groove 38, the fourth inserting part 37 protrudes from the surface of the body part 32, and the fourth inserting groove 38 is recessed from the surface of the body part 32 to the fourth inserting part 37.

[0299] Specifically, the fourth inserting part 37 is fixedly connected to one side of the body part 32 along the first direction, and the fourth inserting part 37 protrudes from the surface of the body part 32 along the first direction. The fourth inserting groove 38 is recessed to the other side along the first direction, and the depth of the fourth inserting groove 38 can be less than or equal to the width of the body part 32.

[0300] Optionally, when the electric connecting column 30 is connected with the two pole column parts 21, the fourth inserting part 37 is inserted into the third inserting groove 213, the third inserting part 214 is inserted into the fourth inserting groove 38, and the body part 32 can be located outside the battery monomer 20.

[0301] Optionally, referring to FIG. 17, the first direction is the left-right direction, the fourth inserting groove 38 is formed on the left side of the electric connecting column 30, the right side of the battery monomer 20 on the left side is formed with the third inserting part 214, the third inserting part 214 is inserted into the fourth inserting groove 38, and the left side of the battery monomer 20 is electrically connected with the electric connecting column 30; the fourth inserting part 37 is formed on the right side of the electric connecting column 30, the left side of the battery monomer 20 on the right side is formed with the third inserting groove 213, the fourth inserting part 37 is inserted into the third inserting groove 213, and the right side of the battery monomer 20 is electrically connected with the electric connecting column 30.

[0302] In the embodiments of the present application, the fourth inserting part 37 and the fourth inserting groove 38 are respectively arranged on both sides of the body part 32 along the first direction, the fourth inserting part 37 protrudes from the surface of the body part 32, and the fourth inserting groove 38 is recessed from the surface of the body part 32 to the fourth inserting part 37, so that the left and right sides of the electric connecting column 30 are connected with the pole column part 21 of the battery monomer 20 in different insertion or receiving modes, which is conducive to adjusting the width between the two battery monomers 20, adapting to the expansion of the battery monomer 20, and further improving the electrical connection reliability.

[0303] In some embodiments, the body part 32 is formed with a plurality of glue injection holes 321, the fourth inserting part 37 is formed with a flow guide groove 331, one glue injection hole 321 is communicated with the flow guide groove 331 and one of the fourth inserting groove 38; the battery device 100 further comprises a conductive glue layer 24, the conductive glue of the conductive glue layer 24 is injected into the flow guide groove 331 through the glue injection hole 321 and is conductive filled between the fourth inserting part 37 and the third inserting groove 213, or the conductive glue of the conductive layer is injected into the fourth inserting groove 38 through the glue injection hole 321 and is conductive filled between the fourth inserting groove 38 and the third inserting part 214.

[0304] Specifically, the glue injection hole 321 is formed on the surface of the body part 32 exposed outside the battery monomer 20 in the state of being connected with the battery monomer 20. Alternatively, the glue injection hole 321 is formed on the upper surface of the body part 32, the fourth insertion part 37 is formed on the right side of the electric connection column 30, the flow guide groove 331 is formed on the upper and lower surfaces of the fourth insertion part 37, the fourth insertion groove 38 is formed on the left side of the electric connection column 30, the glue injection hole 321 extends from the upper surface of the body part 32 to the left side of the electric connection column 30 and communicates with the fourth insertion groove 38, or extends to the right side of the electric connection column 30 and communicates with the flow guide groove 331. Alternatively, a plurality of glue injection holes 321 are arranged along the length direction of the body part 32. Alternatively, the number of the flow guide grooves 331 is multiple.

[0305] In the embodiments of the present application, the conductive glue is injected into the flow guide groove 331 through the glue injection hole 321 and filled between the fourth insertion part 37 and the third insertion groove 213, or is injected into the fourth insertion groove 38 through the glue injection hole 321 and filled between the fourth insertion groove 38 and the third insertion part 214, so as to ensure good conductive contact between the fourth insertion part 37 and the third insertion groove 213, between the fourth insertion groove 38 and the third insertion part 214, increase the overcurrent area, and improve the conductive performance.

[0306] In some embodiments, the fourth insertion part 37 is provided with a plurality of elastic members 23 along the length extension direction of the body part 32, and the elastic members 23 are elastically abutted between the groove wall of the third insertion groove 213 and the outer periphery of the fourth insertion part 37, so as to prevent the fourth insertion part 37 from being separated from the third insertion groove 213.

[0307] Specifically, the elastic member 23 can be a spring piece, a spring, an elastic block, an elastic pad, etc. Alternatively, the elastic member 23 is arched relative to the surface of the fourth insertion part 37, the arched part of the elastic member 23 abuts the groove wall of the third insertion groove 213 and can be elastically deformed in the arching direction, so as to exert an elastic force on the groove wall of the third insertion groove 213, prevent the fourth insertion part 37 from being separated from the third insertion groove 213, and improve the connection reliability of the electric connection column 30 and the pole part 21.

[0308] Referring to FIG. 3, in some embodiments, the battery monomer includes a shell 25 and an electrode assembly 26, the electrode assembly 26 is arranged in the shell 25, the shell 25 is provided with a mounting hole (not shown), the pole part 21 is wholly arranged outside the mounting hole (not shown), or part of the pole part 21 is arranged outside the mounting hole (not shown), part of the pole part 21 penetrates into the shell 25 through the mounting hole (not shown) and cooperates with the shell 25; the pole part 21 is electrically connected with the electrode assembly 26.

[0309] Specifically, the shape of the mounting hole (not shown in the figure) can match the cross-sectional shape of the pole portion 21. For example, the pole portion 21 is in the shape of a long strip, and the mounting hole (not shown in the figure) is also in the shape of a long strip with a size close to or the same as that of the pole portion 21. When the pole portion 21 is entirely covered outside the mounting hole (not shown in the figure), the pole portion 21 is entirely located outside the shell 25. When the pole portion 21 is partially inserted into the mounting hole (not shown in the figure), the portion of the pole portion 21 inserted into the mounting hole (not shown in the figure) can be buckled with the shell 25 and connected with the electrode assembly 26.

[0310] When the pole portion 21 is entirely covered outside the mounting hole (not shown in the figure), the assembly of the pole portion 21 and the shell 25 is facilitated, the manufacturing process is simplified, and the reliability and stability of the connection between the pole portion 21 and the shell 25 are improved. After the pole portion 21 is combined with the shell 25, the pole portion 21 is less likely to be separated from the shell 25 or cracked or damaged due to vibration or external pulling during the charging and discharging process of the battery monomer 20.

[0311] When the pole portion 21 is partially covered outside the mounting hole (not shown in the figure) and partially inserted into the shell 25 through the mounting hole (not shown in the figure) to be combined with the shell 25, the electrical connection stability and overcurrent capacity of the pole portion 21 and the electrode assembly 26 in the shell 25 are improved.

[0312] Referring to FIG. 3, in some embodiments, the shell 25 includes a shell body 252 and an end cover 253. The shell body 252 has an opening 2521, and the end cover 253 is sealed to cover the opening 2521. The pole portion 21 is arranged in any one of the shell body 252 and the end cover 253.

[0313] Specifically, the end cover 253 is a component capable of being combined with the shell body 252 at the opening 2521 to isolate the internal environment of the battery monomer 20 from the external environment. The internal environment formed by the shell body 252 and the end cover 253 can be used to accommodate the electrode assembly 26, the electrolyte, and other components. Without limitation, the shape of the end cover 253 can be adapted to the shape of the shell body 252 to be combined with the shell body 252. For example, the shell body 252 can be in the shape of a cuboid, a cylinder, a hexagonal prism, or the like. Specifically, the shape of the shell body 252 can be determined according to the specific shape and size of the electrode assembly 26. The material of the shell 25 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, and the like, which are not specially limited in the embodiments of the present application. Alternatively, the shell 25 can be made of a material with certain hardness and strength (such as aluminum alloy), so that the shell 25 is less likely to be deformed when being squeezed or collided, and the battery monomer 20 can have higher structural strength and safety performance.

[0314] The pole portion 21 is arranged on either of the housing 252 and the end cover 253, and is electrically connected with the electrode assembly 26 for outputting or inputting the electric energy of the battery monomer 20. In some embodiments, an insulating member can also be arranged on the inner side of the end cover 253, which can be used to isolate the electrically connected components in the housing 252 from the end cover 253 to reduce the risk of short circuit. For example, the insulating member can be plastic, rubber, etc.

[0315] The housing 252 and the end cover 253 can be independent components, and an opening 2521 can be arranged on the housing 252. The end cover 253 is used to cover the opening 2521 to form the internal environment of the battery monomer 20. Not limitedly, the end cover 253 and the housing 252 can also be integrated. Specifically, the end cover 253 and the housing 252 can form a common connecting surface before other components enter the housing, and then the end cover 253 is used to cover the housing 252 when it is necessary to seal the internal environment of the housing 252.

[0316] In the embodiments of the present application, the housing 252 has an opening 2521, and the end cover 253 is used to seal the opening 2521. The pole portion 21 is arranged on either of the housing 252 and the end cover 253, which is convenient for the assembly and production of the housing 25 and the electrode assembly 26.

[0317] Referring to FIGS. 3-4, in some embodiments, the battery monomer 20 has two first side walls 251 opposite in a first direction, two second side walls 255 opposite in a second direction, and two third side walls 256 opposite in a third direction. The first direction, the second direction, and the third direction are perpendicular to each other. The pole portion 21 is arranged on the first side wall 251. The areas of the second side wall 255 and the third side wall 256 are both greater than the area of the first side wall 251. In other embodiments, the areas of the second side wall 255 and the third side wall 256 are both less than the area of the first side wall 251.

[0318] Optionally, the first direction is the front-rear direction, the second direction is the up-down direction, and the third direction is the left-right direction. In some embodiments, the battery monomer 20 is in the shape of a cuboid, the length of the two sides of the first side wall 251 is greater than the length of the third side perpendicular to the first side wall 251, and the first side wall 251 is the largest wall surface in the cuboid. In the embodiments of the present application, the pole portion 21 is arranged on the first side wall 251, which can increase the overcurrent area of the electric connection of the battery monomer 20 and guarantee the fast charging performance.

[0319] Optionally, in some embodiments, the battery cell 20 is cuboid-shaped, the length of two sides of the first side wall 251 is less than the length of the third side perpendicular to the first side wall 251, and the first side wall 251 is the smallest wall of the cuboid, so that the expansion of the battery cell 20 at the first side wall 251 is small during use, reducing the influence of the expansion of the battery cell 20 on the pole part 21, thereby ensuring the electrical connection reliability of the battery cell 20 and the electrical connection column 30.

[0320] In some embodiments, the battery cell 20 includes a shell 25 and an electrode assembly 26 disposed in the shell 25; the pole 21 is disposed in the shell 25, and the tab 262 of the electrode assembly 26 is electrically connected to the pole 21; the electrode assembly 26 is disposed between the end of the tab 262 and the shell 25 to form a gap, and the tab 262 is disposed in the gap; the pole 21 is disposed at a position opposite to the gap of the shell 25.

[0321] Optionally, referring to FIG. 2, the electrode assembly 26 includes a main body 261, and the tab 262 is disposed at the upper end of the main body 261, and the pole 21 is disposed on the first wall 251 which is the largest wall of the shell 25. The tab 262 can be directly connected to the pole 21, or can be connected to the pole 21 through an adapter piece.

[0322] The electrode assembly 26 is a component in the battery cell 20 where electrochemical reactions occur. One or more electrode assemblies 26 can be contained within the shell 25. The electrode assembly 26 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is usually disposed between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet and the negative electrode sheet have portions of active material constituting the main body 261 of the electrode assembly 26, and the portions of the positive electrode sheet and the negative electrode sheet without active material each constitute a tab 262. The positive electrode tab and the negative electrode tab can be located at one end of the main body 261 together, or can be located at two ends of the main body 261 respectively. During charging and discharging, the positive active material and the negative active material react with the electrolyte, and the tab 262 is connected to the pole 21 to form a current loop.

[0323] The shell 25 forms a receiving space, and the electrode assembly 26 is accommodated in the receiving space. The end of the tab 262 of the electrode assembly 26 is disposed between the shell 25 to form a gap, that is, the gap is formed between the end of the main body and the shell. On the one hand, the gap can enable the electrolyte to fully soak the electrode assembly to some extent, and on the other hand, the gap can provide a space for the connection of the tab 262 and the pole 21 or the adapter piece.

[0324] The pole 21 is arranged at a position opposite to the gap of the shell 25. When the battery cell 20 is in operation, the main body 261 of the electrode assembly 26 will expand. The expanded main body 261 can move the pole 21 arranged on the shell 25. If the pole 21 is arranged at a position opposite to the main body 261, when the main body 261 moves due to expansion, the pole 21 will move a first displacement synchronously. The pole 21 is arranged at a position opposite to the gap of the shell 25. Even if the main body 261 moves due to expansion, the second displacement (smaller) of the pole 21 moved by the main body 261 will be smaller than the first displacement, so that the displacement of the pole 21 is smaller, which to some extent avoids the disconnection between the pole 21 and the tab 262 caused by the large displacement of the pole 21.

[0325] In some embodiments, the battery cell 20 comprises a pressure relief mechanism 254 arranged on one of the two second side walls 255 and the two third side walls 256. The pressure relief mechanism 254 is used to break when the internal pressure of the battery cell 20 exceeds a pressure threshold.

[0326] Referring to FIG. 3, in some embodiments, the battery cell 20 comprises a pressure relief mechanism 254 arranged on the surface of the shell 25 other than the first side wall 251. The pressure relief mechanism 254 is used to break before the shell 25 when the internal pressure of the battery cell 20 exceeds a pressure threshold.

[0327] Optionally, the pressure relief mechanism 254 forms a local wall thickness shallower than the overall wall thickness on the shell 25 other than the first side wall 251 by means of a notch, a groove, etc. As shown in FIG. 3, the second side wall 255 comprises an end cover 253 located above the opening of the shell 252. The pressure relief mechanism 254 is arranged on the end cover 253.

[0328] Optionally, the first side wall 251 is located at the front and rear sides of the battery cell 20. The pressure relief mechanism 254 can be arranged on one of the left, right, upper, and lower sides of the shell 25.

[0329] In the embodiments of the present application, the pressure relief mechanism 254 is arranged on the surface of the shell 25 other than the first side wall 251. When the internal pressure of the battery cell 20 exceeds a threshold, the pressure relief mechanism 254 breaks before other walls of the shell 25, releasing the internal pressure, thereby avoiding the risk of cracking of the first side wall 251 when the internal pressure of the battery cell 20 is too large, reducing the impact of the internal pressure of the battery cell 20 being too large on the pole part 21, and further reducing the safety risk.

[0330] Referring to FIGS. 20-18, in some embodiments, the battery device 100 comprises a sampling member 40 directly contacting the pole part 21 to collect parameter information of the corresponding battery cell 20.

[0331] Optionally, the sampling member 40 collects parameter information of the battery cell 20 directly contacting the pole portion 21. In another embodiment, two battery cells 20 arranged in the first direction and adjacent to each other are electrically connected by two pole portions 21 being plugged into each other, and the sampling member 40 abuts against the two pole portions 21 plugged into each other to collect parameter information of the two pole portions 21 plugged into each other.

[0332] Optionally, the sampling member 40 can be a voltage sampling structure of the battery cell 20 to sample voltage information of the battery cell 20 by directly contacting the pole portion 21. The sampling member 40 is a contact type electrical connection structure.

[0333] In the embodiments of the present application, the sampling member 40 directly contacts the pole portion 21 to improve the accuracy and synchronism of collecting parameter information of the battery cell 20.

[0334] Referring to FIGS. 20-18, in some embodiments, the contact mode of the sampling member with the pole portion 21 includes at least one of the following:

[0335] The sampling member 40 contacts at least one of the two connected pole portions 21 in the axial direction L of the pole portion 21;

[0336] The sampling member 40 contacts at least one of the two connected pole portions 21 in the circumferential direction of the pole portion 21;

[0337] The sampling member 40 contacts at least one of the two connected pole portions 21 in the radial direction D of the pole portion 21.

[0338] In FIGS. 18-29, the circumferential direction of the pole portion 21 is the direction around the axial direction L of the pole portion 21, the radial direction D of the pole portion 21 can be perpendicular to the axial direction L of the pole portion 21, the first direction can be parallel to the axial direction L of the pole portion 21, or the first direction can coincide with the axial direction L of the pole portion 21.

[0339] The contact mode of the sampling member 40 with the pole portion 21 includes at least one of the following:

[0340] The sampling member 40 contacts at least one of the two connected pole portions 21 in the axial direction L of the pole portion 21 (hereinafter referred to as contact mode one), as shown in FIG. 20;

[0341] The sampling member 40 contacts at least one of the two connected pole portions 21 in the circumferential direction of the pole portion 21 (hereinafter referred to as contact mode two), as shown in FIG. 18;

[0342] The sampling member 40 contacts at least one of the two connected pole portions 21 in the radial direction D of the pole portion 21 (hereinafter referred to as contact mode three).

[0343] In one embodiment, the contact manner of the sampling member 40 with the pole portion 21 is contact manner one. In the contact manner one, the sampling member 40 can contact one of the pole portions 21 in the axial direction L of the pole portion 21, or can contact both of the pole portions 21. The contact manner one can be suitable for installing the sampling member 40 in a scenario including but not limited to a scenario where the space in the circumferential direction and the radial direction D of the pole portion 21 is small, and the space in the axial direction L of the pole portion 21 is large.

[0344] In one embodiment, the contact manner of the sampling member 40 with the pole portion 21 is contact manner two. In the contact manner two, the sampling member 40 can contact one of the pole portions 21 in the circumferential direction of the pole portion 21, or can contact both of the pole portions 21. The contact manner two can be suitable for installing the sampling member 40 in a scenario including but not limited to a scenario where the space in the axial direction L and the radial direction D of the pole portion 21 is small, and the space in the circumferential direction of the pole portion 21 is large.

[0345] In one embodiment, the contact manner of the sampling member 40 with the pole portion 21 is contact manner three. In the contact manner three, the sampling member 40 can contact one of the pole portions 21 in the radial direction D of the pole portion 21, or can contact both of the pole portions 21. The contact manner three can be suitable for installing the sampling member 40 in a scenario including but not limited to a scenario where the space in the circumferential direction and the axial direction L of the pole portion 21 is small, and the space in the radial direction D of the pole portion 21 is large.

[0346] In one embodiment, the contact manner of the sampling member 40 with the pole portion 21 includes the contact manner one and two. Optionally, the sampling member 40 can contact one of the pole portions 21 in the axial direction L of the pole portion 21, and can contact another of the pole portions 21 in the circumferential direction of the pole portion 21. Optionally, the sampling member 40 can contact one of the pole portions 21 in the axial direction L and the circumferential direction of the pole portion 21, and can contact another of the pole portions 21 in the circumferential direction and the axial direction L of the pole portion 21. Optionally, the sampling member 40 can contact one of the pole portions 21 in the axial direction L of the pole portion 21, and can contact another of the pole portions 21 in the axial direction L and the circumferential direction of the pole portion 21.

[0347] In one embodiment, the contact mode of the sampling member 40 with the pole column part 21 includes the contact modes one and three. Optionally, the sampling member 40 can be in contact with one of the pole column parts 21 in the axial direction L of the pole column part 21, and in contact with the other pole column part 21 in the radial direction D of the pole column part 21. Optionally, the sampling member 40 can be in contact with one of the pole column parts 21 in the axial direction L and the radial direction D of the pole column part 21, and in contact with the other pole column part 21 in the axial direction L and the radial direction D of the pole column part 21. Optionally, the sampling member 40 can be in contact with one of the pole column parts 21 in the radial direction D of the pole column part 21, and in contact with the other pole column part 21 in the axial direction L and the radial direction D of the pole column part 21.

[0348] In one embodiment, the contact mode of the sampling member 40 with the pole column part 21 includes the contact modes two and three. Optionally, the sampling member 40 can be in contact with one of the pole column parts 21 in the circumferential direction of the pole column part 21, and in contact with the other pole column part 21 in the radial direction D of the pole column part 21. Optionally, the sampling member 40 can be in contact with one of the pole column parts 21 in the circumferential direction and the radial direction D of the pole column part 21, and in contact with the other pole column part 21 in the circumferential direction and the radial direction D of the pole column part 21. Optionally, the sampling member 40 can be in contact with one of the pole column parts 21 in the radial direction D of the pole column part 21, and in contact with the other pole column part 21 in the circumferential direction and the radial direction D of the pole column part 21.

[0349] In one embodiment, the contact mode of the sampling member 40 with the pole column part 21 includes the contact modes one, two and three, and the specific explanations of the contact modes can refer to the above explanations, which will not be described in detail here to avoid redundancy.

[0350] In the embodiments of the present application, the sampling member 40 can be in contact with the pole column part 21 in at least one of the axial, circumferential and radial directions of the pole column part 21, so as to realize the electrical connection between the sampling member 40 and the pole column part 21, thereby providing a flexible sampling connection scheme for different pole column part 21 connection modes, and making the arrangement of the sampling member 40 more flexible, which to some extent alleviates the space limitation on the sampling member 40.

[0351] Optionally, the material of the sampling member 40 includes but is not limited to nickel and copper. Optionally, the sampling member 40 is connected to the output line 33, and the output line 33 is arranged to facilitate the transmission of the electrical information of the battery monomer 20 to a control unit, such as a voltage sampling control unit.

[0352] Please refer to FIGS. 18-29. In some embodiments, the electrical connection column 30 includes a connection column body 39 and a sampling part 41. The connection column body 39 is respectively inserted with the pole column parts 21 of the adjacent two battery monomers 20, and the sampling part 41 is arranged on the connection column body 39 and forms the sampling member 40.

[0353] Optionally, as shown in FIG. 18, the two sides of the connecting post body 39 are formed with protruding plug-in parts 391. The pole post part 21 of the battery monomer 20 is formed with plug-in grooves 392. The plug-in parts 391 on the two sides of the connecting post body 39 are respectively plugged into the plug-in grooves 392 of the adjacent two battery monomers 20 to electrically connect the adjacent two battery monomers 20.

[0354] Optionally, as shown in FIG. 19, the two sides of the connecting post body 39 are formed with plug-in grooves 392. The pole post part 21 of the battery monomer 20 is formed with plug-in parts 391 which are protruding structures matching the plug-in grooves 392. The adjacent two battery monomers 20 are respectively plugged into the plug-in grooves 392 on the two sides of the connecting post body 39 by at least one plug-in part 391 to electrically connect the adjacent two battery monomers 20.

[0355] Optionally, one side of the two sides of the connecting post body 39 is formed with a protruding plug-in part 391, and the other side is formed with a concave plug-in groove 392. The plug-in part 391 and the plug-in groove 392 on the two sides of the connecting post body 39 are respectively plugged into the pole post part 21 of the adjacent two battery monomers 20.

[0356] Optionally, the two sides of the connecting post body 39 in the first direction are respectively plugged into the pole post part 21 of the adjacent two battery monomers 20. The first direction is the front-rear direction. The sampling part 41 can be arranged on the side surface other than the front-rear side of the connecting post body 39. For example, to reduce the interference of the sampling part 41 with the plugging between the connecting post body 39 and the pole post part 21, the sampling part 41 can be arranged on the upper side surface and / or the lower side surface of the connecting post body 39, and can be further located at the middle position of the connecting post body 39 in the front-rear direction.

[0357] In the embodiments of the present application, the sampling part 41 and the connecting post body 39 are arranged to form the sampling member 40 by the electric connecting post, which improves the integration of parts and is conducive to improving the assembly efficiency. At the same time, the internal resistance between the sampling member 40 and the pole post part 21 is reduced, so that the heat generation can be reduced in the process of collecting the parameter information of the battery monomer 20, and the sampling part 41 is prevented from being damaged by overheating to a certain extent.

[0358] 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 are respectively abutted with the two pole posts in electric connection.

[0359] In the embodiments of the present application, the sampling part 41 is integrally formed with the connecting column body 39, thereby reducing the number of parts, improving assembly efficiency, and reducing or avoiding gaps between the sampling part 41 and the connecting column body 39, thereby reducing the loss of parameter information collected by the sampling part 40. The two sides of the sampling part 41 abut against the two polar column parts 21 that are electrically connected and matched, so that the sampling part 41 can collect parameter information of the corresponding two battery monomers 20.

[0360] In other embodiments, the sampling part 41 is sleeved on the outside of the connecting column body 39, and the two sides of the sampling part 41 abut against the two polar column parts 21 that are electrically connected and matched.

[0361] Optionally, please refer to FIGS. 18, 20-23, and 26-29, in which the first direction is the front-rear direction. The sampling part 41 is sleeved on the outside of the connecting column body 39, and the two sides of the sampling part 41 abut against the two polar column parts 21 that are electrically connected and matched.

[0362] 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 outside (circumferential side) of the connecting column body 39.

[0363] The two side surfaces of the sampling part 41 are the two end surfaces of the sampling part 41 along the first direction. The two side surfaces of the sampling part 41 abut against the first polar column 27 and the second polar column 28, respectively. The sampling part 41 can be connected to the first polar column 27 and the second polar column 28 through end surface contact, so that the sampling part 41 can collect parameter information of the battery monomer 20 corresponding to the first polar column 27 and parameter information of the battery monomer 20 corresponding to the second polar column 28.

[0364] In addition, the sleeving manner also facilitates the assembly of the sampling part 41 and the connecting column body 39. Specifically, during assembly, the connecting column body 39 passes through the second through hole 422, and the two side surfaces of the sampling part 41 abut against the first polar column 27 and the second polar column 28, respectively, so that the sampling part 41 and the connecting column body 39 are assembled, and the assembly efficiency is high.

[0365] Please refer to FIGS. 18, 20-23, and 26-29. In some embodiments, the sampling part 41 includes a connecting structure 44 and a sleeving structure 441. The sleeving structure 441 is sleeved on the outside of the connecting column body 39 and abuts against the first polar column 27 and the second polar column 28 on the two side surfaces. The connecting structure 44 is connected to the output line 42 of the sampling.

[0366] Therefore, the sampling part 40 can realize the functions of sleeving and parameter information output.

[0367] Please refer to FIG. 18, FIG. 20-23, FIG. 26-29, the two sides of the sleeving structure 441 along the first direction are respectively in abutment with the first pole 27 and the second pole 28, so that the sampling member 40 can collect the parameter information of the battery monomer 20 corresponding to the first pole 27 and the parameter information of the battery monomer 20 corresponding to the second pole 28 through the sleeving structure 441.

[0368] The parameter information of the battery monomer 20 can be transmitted to the output line 42 through the connecting structure 44, and the output line 42 is provided to facilitate the transmission of the parameter information of the battery monomer 20 to the control unit, such as the control unit of the voltage sampling.

[0369] When the sampling member 40, the first pole 27 and the second pole 28 are assembled, one end of the connecting column body 39 can be inserted into the first pole 27 or the second pole 28 first, one side of the sleeving structure 441 can be in abutment with the first pole 27 or the second pole 28, and then the second pole 28 or the first pole 27 is inserted into the other end of the connecting column body 39, so that the second pole 28 or the first pole 27 is in abutment with the other side of the sleeving structure 441, thereby completing the assembly of the sampling member 40, the first pole 27 and the second pole 28, and the assembly efficiency is high.

[0370] Optionally, the sleeving structure 441 can be continuously sleeved on the circumferential side of the connecting column body 39 along the circumferential direction of the connecting column body 39, and the contact area between the sleeving structure 441 and the first pole 27 and the second pole 28 is large, and the connection is reliable.

[0371] Please refer to FIG. 18, FIG. 20-23, FIG. 26-29, in some embodiments, the sleeving structure 441 includes a sleeving plate 432, and the sleeving plate 432 is sleeved on the connecting column body 39 through the second through hole 422.

[0372] Therefore, the sampling member 40 can be in abutment with the first pole 27 and the second pole 28 through the sleeving plate 432, and the contact area between the sampling member 40 and the first pole 27 and the second pole 28 is large, which is beneficial to maintain the connection stability of the sampling member 40 and the first pole 27 and the second pole 28.

[0373] Specifically, the two sides of the sleeving plate 432 along the first direction are both in a planar shape, and the planar sides are in abutment with the first pole 27 and the second pole 28, so that the contact area between the sampling member 40 and the first pole 27 and the second pole 28 is large, and the sampling member 40 and the first pole 27 and the second pole 28 are not easily separated to cause disconnection and fail to collect the parameter information of the battery monomer 20, thereby being beneficial to maintain the connection stability of the sampling member 40 and the first pole 27 and the second pole 28.

[0374] Optionally, the sleeve plate 432 is elastic, and the two side surfaces of the sleeve plate 432 along the first direction abut against the first pole 27 and the second pole 28 respectively. When the sleeve plate 432 is pressed by the first pole 27, the sleeve plate 432 can elastically deform and provide a certain elastic force to the first pole 27, so that the sleeve plate 432 is in closer contact with the first pole 27; when the sleeve plate 432 is pressed by the second pole 28, the sleeve plate 432 can provide a certain elastic force to the second pole 28, so that the sleeve plate 432 is in closer contact with the second pole 28, thereby ensuring the side surface of the sleeve plate 432 to be in effective contact with the end surface of the pole to a certain extent through the abutment of the sleeve plate 432 and the pole, and improving the reliability of the connection between the sampling member 40 and the pole to a certain extent.

[0375] Please refer to FIGS. 20-23. In some embodiments, the number of sleeve plates 432 is two, and the two sleeve plates 432 are spaced apart on the connecting structure 44. One of the two sleeve plates 432 abuts against the second pole 28, and the other of the two sleeve plates 432 abuts against the first pole 27.

[0376] Optionally, in an embodiment, the sleeve structure 441 can be a one-piece structure, i.e., the two sleeve plates 432 are integrally formed. In an embodiment, the material of the sleeve structure 441 is metal, and the sleeve structure 441 can be manufactured by stamping and bending a metal sheet. Optionally, the sleeve structure 441 can also be a split structure, and the two sleeve plates 432 can be connected by means including but not limited to welding and bolting.

[0377] The two sleeve plates 432 are elastic and spaced apart on the connecting structure 44. One of the two sleeve plates 432 abuts against the first pole 27, and the other of the two sleeve plates 432 abuts against the second pole 28. Thus, when the one sleeve plate 432 is pressed by the first pole 27, the one sleeve plate 432 can elastically deform in the direction close to the other sleeve plate 432. The two sleeve plates 432 spaced apart can provide a space for the deformation of the sleeve plate 432. The one sleeve plate 432 that elastically deforms can provide a certain elastic force to the first pole 27, so that the one sleeve plate 432 is in closer contact with the first pole 27; when the other sleeve plate 432 is pressed by the second pole 28, the other sleeve plate 432 can provide a certain elastic force to the second pole 28, so that the other sleeve plate 432 is in closer contact with the second pole 28, thereby ensuring the sleeve plate 432 to be in effective contact with the pole 21 to a certain extent through the abutment of the sleeve plate 432 and the pole, and improving the reliability of the sampling member 40 to a certain extent.

[0378] Please refer to FIG. 24 to FIG. 25, in some embodiments, the sleeving structure 441 further comprises an elastic pad 45 arranged on one side of the sleeving plate 432, the elastic pad 45 is provided with a through hole 451 matched with the second through hole 422, and the sleeving plate 432 and the elastic pad 45 are sleeved on the connecting column body 39 through the second through hole 422 and the through hole 451; the elastic pad 45 is in abutment with the first pole 27, and the side, away from the elastic pad 45, of the sleeving part 43 is in abutment with the second pole 28.

[0379] The elastic pad 45 can have a certain elasticity, please refer to FIG. 24 to FIG. 25, the elastic pad 45 is in abutment between one side of the sleeving plate 432 along the first direction and the end face of the first pole 27.

[0380] The elastic pad 45 is in abutment with the first pole 27, and the side, away from the elastic pad 45, of the sleeving part 43 is in abutment with the second pole 28, so that the elastic pad 45 can be located between the sleeving plate 432 and the first pole 27 in a manner of interference fit, so that the elastic pad 45 is in a compressed state. The elastic pad 45 can apply a pressure to the sleeving plate 432, and the pressure can realize effective contact between the sleeving plate 432 and the second pole 28. The elastic pad 45 includes but is not limited to foam.

[0381] Please refer to FIG. 28 to FIG. 29, in some embodiments, the sleeving plate 432 is provided with an elastic ring 70 around the second through hole 422, and the sleeving plate 432 is sleeved on the connecting column body 39 through the elastic ring 70.

[0382] Optionally, the elastic ring 70 is conductive, and can form an electrical connection between the sleeving plate 432 around the second through hole 422 and the connecting column body 39. The connecting column body 39 penetrates the second through hole 422, and the elastic ring 70 is located between the sleeving plate 432 around the second through hole 422 and the circumferential side of the connecting column body 39.

[0383] The sleeving plate 432 is sleeved on the connecting column body 39 through the elastic ring 70, and the elastic ring 70 can absorb a certain vibration, so that the effective contact between the sleeving plate 432 and the connecting column body 39 can be maintained to a certain extent in the case that the battery monomer 20 or the electrical device is impacted by vibration.

[0384] Please refer to FIG. 29, the elastic ring 70 can be provided between the sleeving plate 432 around the second through hole 422 and the connecting column body 39 in a circumferential direction of the connecting column body 39 by 360 degrees, so that the contact area between the elastic ring 70 and the connecting column body 39 can be large, and the elastic ring 70 can attenuate vibration in all directions.

[0385] The elastic ring 70 includes but is not limited to a ring, a spring piece, a spring, etc. The ring can be a ring structure formed by connecting the head end and the tail end of a spiral spring.

[0386] Referring to FIG. 2, in some embodiments, the battery device 100 further comprises a box 10, a first expansion beam 13 and a second expansion beam 14; the first expansion beam 13 and the second expansion beam 14 are arranged at intervals and jointly enclose the battery compartment 15 with the box 10; a plurality of battery monomers 20 are arranged in the battery compartment 15 in sequence, and the battery monomers 20 at the ends are respectively matched with the first expansion beam 13 and the second expansion beam 14.

[0387] The battery device 100 of the present embodiment can form a CTP (Cell To Pack) scheme. Compared with the battery device 100 of the MTP (Module To Pack) scheme, the battery device 100 of the CTP scheme of the present embodiment can reduce the structural members required for fixing the battery modules, improve the space utilization in the box 10, and thus increase the number of battery monomers 20 in the box 10 under the condition of the same size of the box 10, so as to increase the energy density of the battery device 100.

[0388] Alternatively, in FIG. 2, the first expansion beam 13 and the second expansion beam 14 are arranged at intervals and jointly enclose two battery compartments 15 with the box 10. A plurality of battery monomers 20 are connected to form a row of battery groups along a first direction (e.g., the front-rear direction in FIG. 2), and two rows of battery groups are arranged in the two battery compartments 15 along a second direction (e.g., the left-right direction in FIG. 2). It can be understood that in other embodiments, the number of rows of battery groups includes but is not limited to one row or more than two rows.

[0389] The first expansion beam 13 and the second expansion beam 14 can be arranged at the two ends of the battery groups along the first direction. In FIG. 2, the first expansion beam 13 and the second expansion beam 14 are respectively arranged at the front end and the rear end of a row of battery groups, the battery monomers 20 at the front end of the battery groups are matched with the first expansion beam 13, and the battery monomers 20 at the rear end of the battery groups are matched with the second expansion beam 14, so that the first expansion beam 13 and the second expansion beam 14 bind a row of battery groups in the front-rear direction (the first direction).

[0390] Alternatively, in FIG. 2, the first expansion beam 13 is matched with the wall with the largest area on the shell of the battery monomer 20 at the front end, and the second expansion beam 14 is matched with the wall with the largest area on the shell of the battery monomer 20 at the rear end. During the working process of the battery monomer 20, the expansion amount of the wall with the largest area on the shell is greater than that of other walls on the shell as the electrode assembly releases gas. By respectively matching the first expansion beam 13 and the second expansion beam 14 with the wall with the largest area on the shell of the battery monomer 20 at the end, the wall with the largest area on the shell can be prevented from cracking to a certain extent due to the excessive expansion amount, and the safety of the battery device 100 is improved.

[0391] Optionally, the battery device 100 further comprises a cross beam 16 connecting two side plates (e.g. left and right side plates) of the box 10 along the second direction, and a longitudinal beam 17 connecting the first expansion beam 13 and the second expansion beam 14 arranged along the first direction, and the cross beam 16 connects the longitudinal beam 17, so as to improve the structural strength of the box 10. The number of the cross beam 16 and the longitudinal beam 17 is not limited in the present application. In FIG. 2, the number of the cross beam 16 and the longitudinal beam 17 is one, and one cross beam 16 and one longitudinal beam 17 are connected, so as to improve the structural strength of the box 10.

[0392] Thus, the battery cells 20 at the end are matched 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 bind the battery cells 20 when the battery cells 20 expand.

[0393] According to some embodiments of the present application, the battery device 100 further comprises the box 10, a module shell (not shown in the figure) and a mounting beam (not shown in the figure), the plurality of battery cells 20 are arranged in the module shell, and the module shell is mounted in the box 10 through the mounting beam.

[0394] The battery device 100 of the present embodiment can form a MTP (Module To Pack) scheme.

[0395] Optionally, the plurality of battery cells 20 are arranged in one module shell, so as to form one battery module, and one or more battery modules can be placed in the box 10. The plurality of battery modules can be connected in series, connected in parallel or connected in a hybrid manner. The plurality of battery cells 20 in one module shell can be connected in series, connected in parallel or connected in a hybrid manner.

[0396] The mounting beam can be fixed in the box 10 and connected with the module shell, so as to fix the battery module in the box 10. The fixing mode can include but is not limited to welding, bolt connection and the like.

[0397] Optionally, in one embodiment, the module shell can have a frame structure, such as a square frame structure. The plurality of battery cells 20 are arranged in the space defined by the frame structure. Optionally, in one embodiment, the module shell can comprise a strap (e.g. steel strap), and the strap can bind and fix the plurality of battery cells 20.

[0398] The module shell is mounted in the box 10 through the mounting beam, so as to assemble the plurality of battery cells 20 into a battery module, and then fix the battery module in the box 10 through the mounting beam.

[0399] According to some embodiments of the present application, the present application provides a battery cell 20, which comprises a shell 25, an electrode assembly 26 and a pole post part 21, wherein the shell 25 comprises two first side walls 251 opposite to each other; the electrode assembly 26 is arranged in the shell 25, and the electrode assembly 26 comprises a tab 262 arranged near the edge of the first side wall 251; the pole post part 21 is arranged near the edge of the first side wall 251 where the tab 262 is located, and is electrically connected with the tab 262; the pole post part 21 is formed with a plug-in part protruding relative to the first side wall 251 or a plug-in groove recessed towards the inside of the shell 25, and the plug-in part or the plug-in groove is plugged with an electrical connection column 30 to electrically connect the battery cell 20 with the electrical connection column 30.

[0400] Specifically, referring to FIG. 3, the electrode assembly 26 is a component where electrochemical reactions occur in the battery cell 20. One or more electrode assemblies 26 can be contained in the shell 252. The electrode assembly 26 is mainly formed by winding or layering a positive electrode sheet and a negative electrode sheet, and a diaphragm is usually arranged between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet and the negative electrode sheet have a portion with active material constituting a main body 261 of the electrode assembly 26, and a portion without active material constituting a tab 262 respectively. The positive electrode tab 262 and the negative electrode tab 262 can be located at one end of the main body 261 together or at two ends of the main body 261 respectively. In the charging and discharging process of the battery 0, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tab 262 is connected with the pole post part 21 to form a current loop.

[0401] Optionally, the plug-in part can be a second plug-in part 212 as shown in FIG. 14 or a third plug-in part 214 as shown in FIG. 17, and the plug-in groove can be a first plug-in groove 211 as shown in FIG. 8 or a third plug-in groove 213 as shown in FIG. 17.

[0402] The battery cell 20 is plugged with the electrical connection column 30 through the plug-in part or the plug-in groove formed at the edge of the first side wall 251, thereby realizing electrical connection with another battery cell 20, replacing the connection mode of welding the copper bar with the pole post part 21 of the adjacent battery cell 20 to realize electrical connection of the battery cell 20, thereby improving the defects such as virtual welding and burst hole caused by welding the copper bar with the pole post part 21, and improving the reliability of electrical connection between the battery cells 20. By connecting the pole post parts 21 of the adjacent battery cells 20 through the electrical connection column 30, the shape of each pole post part 21 can be uniformly standardized to ensure the manufacturing efficiency of the pole post part 21, and the distance between the adjacent battery cells 20 can be adjusted through the intermediate electrical connection column 30 to adapt to the expansion of the battery cell 20, thereby further improving the reliability of electrical connection between the battery cells 20.

[0403] Optionally, referring to FIG. 30 and FIG. 31, the shell 25 is formed with a receiving groove 257, which is located on the surface of the battery cell 20 opposite to the surface of the battery cell 20 along the first direction, and is recessed towards the inside of the battery cell 20 relative to the surface of the battery cell 20 on which the receiving groove 257 is located. The receiving groove 257 is used to accommodate the pole portion 21 and the electric connection column 30 (not shown in the figure). The pole portion 21 and the electric connection column 20 of two battery cells 20 adjacent along the first direction are inserted into the receiving groove 257. The receiving groove 257 of the pole portion 21 can be located at the end of the shell 25. For example, the receiving groove 257 is formed on the side wall surface of the shell 25 opposite to the side wall surface along the first direction, and is located at the two opposite corners.

[0404] It can be understood that, in this embodiment, the first direction is the up-down direction in FIG. 30, and is also the direction perpendicular to the paper in FIG. 31. In combination with FIG. 2, the receiving groove 257 is recessed on the surface of the battery cell 20 and is used to accommodate the pole portion 21 and the electric connection column 30. Therefore, when the adjacent two battery cells 20 are connected, the pole portion 21 and the electric connection column 30 are accommodated in the receiving groove 257, and the distance between the adjacent two battery cells 20 along the first direction can be shortened, thereby facilitating the arrangement of more battery cells 20 in the limited volume space of the battery device 100, and improving the energy density.

[0405] Optionally, referring to FIG. 30 and FIG. 31, the battery cell 20 has a flat cuboid shape as a whole, and the length dimension of the battery cell 20 is much larger than the width dimension and the height dimension of the battery cell 20. The pole portion 21 can extend along the width direction of the battery cell 20 and is arranged close to the end of the battery cell 20 along the length direction. In this embodiment, the length dimension of the pole portion 21 is smaller than that of the pole portion 21 extending along the length direction of the battery cell 20, and the pole portion 21 has a short flat structure. The pole portion 21 is formed with a protruding insertion portion (not shown in the figure) or an inwardly recessed insertion groove 392 to be inserted with the electric connection column 30 (not shown in the figure).

[0406] According to some embodiments of the present application, the present application also provides a power utilization device, which comprises the battery device 100 of any one of the above-mentioned schemes, and the battery device 100 is used to provide electric energy for the power utilization device.

[0407] The power utilization device can be a device or a system of any one of the above-mentioned applications of the battery device 100.

[0408] In some embodiments, the power utilization device is a vehicle, the battery device 100 comprises a box body 10, and a plurality of battery cells 20 are arranged in the box body 10. At least a part of the chassis of the vehicle constitutes an upper cover of the box body 10.

[0409] The battery device of the present embodiment can form a CTB (Cell To Body) scheme.

[0410] Optionally, in one embodiment, please refer to Fig. 2, the first part 11 can be the upper cover of the box 10, and the first part 11 can constitute the chassis of the vehicle. In one embodiment, the first part 11 can cover the open side of the second part 12, so that the first part 11 and the second part 12 jointly define a closed space. Optionally, in one embodiment, the first part 11 and the second part 12 can also be hollow structures with one open side, and the open side of the first part 11 covers the open side of the second part 12. Of course, the box 10 formed by the first part 11 and the second part 12 can have various shapes, such as a cylinder, a cuboid, etc.

[0411] Optionally, in one embodiment, the chassis of the vehicle can be formed with a notch, and the battery device 100 is installed into the notch with the first part 11 facing the direction of the chassis of the vehicle, so that the battery device 100 is assembled to the vehicle, and the first part 11 constitutes part of the chassis of the vehicle.

[0412] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the above embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the specification of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

A battery device, wherein, The battery device comprises: a plurality of battery cells arranged along a first direction, the battery cells being provided with pole post portions; an electric connection post, in the first direction, the electric connection post being respectively inserted into the pole post portions of two adjacent battery cells to electrically connect the two adjacent battery cells. The battery device according to claim 1, wherein The pole post portion is formed with a first insertion slot, and the electric connection post is formed with a first insertion portion, at least a part of the first insertion portion being inserted into the first insertion slot to electrically connect with the first insertion slot. The battery device according to claim 2, wherein The pole post portion protrudes from the surface of the battery cell, and the protruding part of the pole post portion is formed with the first insertion slot recessed towards the inside of the battery cell; Alternatively, the first insertion slot is recessed from the surface of the battery cell towards the inside of the battery cell. The battery device according to claim 2, wherein Both of the pole post portions directly connected by the electric connection post are formed with the first insertion slot; the electric connection post is formed with the first insertion portion on both sides along the first direction; The electric connection post is respectively inserted into the first insertion slot at the corresponding position on both sides along the first direction. The battery device according to claim 4, wherein The electric connection post comprises a body portion and a connection portion connected to both sides of the body portion, and each of the two connection portions is formed with a first insertion portion. The battery device according to claim 2, wherein At least one of the first insertion slot and the first insertion portion is connected with an elastic member elastically abutting between the slot wall of the first insertion slot and the outer periphery of the first insertion portion to prevent the first insertion portion from being separated from the first insertion slot. The battery device according to claim 6, wherein The connection direction of the two pole post portions is the first direction, the elastic member is arranged to be arched towards the second direction, and the second direction forms an angle with the first direction. The battery device according to claim 7, wherein The elastic member comprises a first end and a second end fixed to the first insertion portion, and a deformation portion between the first end and the second end, the first end and the second end are opposite along the first direction, the deformation portion is separated from the surface of the first insertion portion and is arched towards the second direction, and the elastic member is configured to be deformed close to the surface of the first insertion portion during the engagement of the first insertion portion and the first insertion slot. The battery device according to claim 8, wherein The slot wall of the first insertion slot has a limiting hole matched with the deformation portion, and at least a part of the deformation portion is inserted into the limiting hole and abuts with the hole wall when the first insertion portion is inserted into the first insertion slot. The battery device according to claim 5, wherein The circumferential surface of the connection portion is formed with a flow guide groove, and the body portion is formed with a glue injection hole, the flow guide groove and the glue injection hole are communicated; The battery device further comprises a conductive glue layer, and the conductive glue of the conductive glue layer is injected and conductively filled between the first insertion slot and the first insertion portion through the glue injection hole and the flow guide groove. The battery device according to claim 10, wherein One glue injection hole is communicated with at least two flow guide grooves located on both sides thereof. The battery device according to claim 6, wherein The electric connection post comprises a body portion and a connection portion connected to both sides of the body portion, and each of the two connection portions is formed with a first insertion portion; A plurality of elastic members are arranged on each first insertion portion at intervals. The battery device according to claim 12, wherein The connecting direction of the two pole column parts is the first direction, the length extension direction of the pole column part and the electric connection part is the third direction, and the third direction and the first direction form an angle; Or, The connecting direction of the two pole column parts is the first direction, the elastic member is arranged in an arch shape in the second direction, the length extension direction of the pole column part and the electric connection part is the third direction, and the first direction, the second direction and the third direction are perpendicular to each other. The battery device according to claim 1, wherein The electric connection column is formed with a second plug-in groove, the pole column part is formed with a second plug-in part, and at least part of the second plug-in part is inserted into the second plug-in groove to be electrically connected and matched with the second plug-in groove. The battery device according to claim 14, wherein The pole column part protrudes from the surface of the battery monomer, and the protruding part of the pole column part forms the second plug-in part; Or, The pole column part is recessed from the surface of the battery monomer to the inside of the battery monomer, and the bottom wall of the recessed pole column part protrudes in a direction away from the battery monomer to form the second plug-in part, the protruding depth of the second plug-in part is less than or equal to the recessed depth of the pole column part, and the circumferential dimension of the second plug-in part is less than the circumferential dimension of the recessed pole column part. The battery device according to claim 14, wherein Both of the two pole column parts directly connected by the electric connection column are formed with the second plug-in part; the electric connection column comprises a body part, and the body part is formed with the second plug-in groove on both sides along the first direction; The electric connection column is respectively plugged with the second plug-in part at the corresponding positions on both sides along the first direction. The battery device according to claim 16, wherein The body part is formed with glue injection holes, and the glue injection holes are communicated with the second plug-in groove. The battery device according to claim 17, wherein The number of glue injection holes is multiple, and the multiple glue injection holes are arranged on the surfaces of the body part opposite in the second direction, the second direction forms an angle with the first direction, the multiple glue injection holes are arranged at intervals along the length extension direction of the body part, and one glue injection hole is communicated with one of the second plug-in grooves on both sides. The battery device according to claim 18, wherein The battery device further comprises a conductive glue layer, and the conductive glue of the conductive glue layer is injected into the second plug-in groove through the glue injection hole and is conductive to fill between the second plug-in groove and the second plug-in part. The battery device according to claim 14, wherein The width of the second plug-in part increases along the direction in which the second plug-in part protrudes. The battery device according to claim 14, wherein The battery device comprises a limiting part arranged at least one end of the length direction of the electric connection column for stopping the second plug-in part from sliding relative to the second plug-in groove. The battery device according to claim 21, wherein The electric connection column is formed with a limiting groove, the limiting groove is located at least one end of the length direction of the second plug-in groove and is communicated with the second plug-in groove, the limiting part is engaged with the limiting groove and abuts against at least one end of the length direction of the second plug-in part. The battery device according to claim 1, wherein One of the two pole column parts directly connected by the electric connection column is formed with a third plug-in groove, the other is formed with a third plug-in part, one side of the electric connection part is formed with a fourth plug-in part, the other side is formed with a fourth plug-in groove, at least part of the fourth plug-in part extends into the third plug-in groove and is plugged with the third plug-in groove; at least part of the third plug-in part extends into the fourth plug-in groove and is plugged with the fourth plug-in groove. The battery device according to claim 23, wherein The pole portion, in which the third insertion groove is formed, protrudes from the surface of the battery cell, and the protruding portion of the pole portion is formed with the third insertion groove recessed toward the inside of the battery cell. Alternatively, the third insertion groove is recessed from the surface of the battery cell toward the inside of the battery cell. The battery device according to claim 23, wherein The pole portion, in which the third insertion portion is formed, protrudes from the surface of the battery cell, and the protruding portion of the pole portion is formed with the third insertion portion. Alternatively, the pole portion, in which the third insertion portion is formed, is recessed from the surface of the battery cell toward the inside of the battery cell, and the bottom wall of the recessed pole portion protrudes toward the direction away from the battery cell to form the third insertion portion, the protruding depth of the third insertion portion is less than or equal to the depth of the recessed pole portion, and the circumferential dimension of the third insertion portion is less than the circumferential dimension of the recessed pole portion. The battery device according to claim 23, wherein The electric connection column comprises a body portion, one side of the body portion in the first direction is connected with the fourth insertion portion, and the other side is formed with the fourth insertion groove, the fourth insertion portion protrudes from the surface of the body portion, and the fourth insertion groove is recessed from the surface of the body portion toward the fourth insertion portion. The battery device according to claim 26, wherein The body portion is formed with a plurality of glue injection holes, the fourth insertion portion is formed with a flow guide groove, and one of the glue injection holes is in communication with the flow guide groove and one of the fourth insertion grooves. The battery device further comprises a conductive glue layer, the conductive glue of the conductive glue layer is injected into the flow guide groove through the glue injection hole and is conductively filled between the fourth insertion portion and the third insertion groove, or the conductive glue of the conductive layer is injected into the fourth insertion groove through the glue injection hole and is conductively filled between the fourth insertion groove and the third insertion portion. The battery device according to claim 26, wherein The fourth insertion portion is provided with a plurality of elastic members in the length extension direction of the body portion, the elastic members are elastically abutted between the groove wall of the third insertion groove and the outer circumference of the fourth insertion portion to prevent the fourth insertion portion from being separated from the third insertion groove. The battery device according to any one of claims 1 to 28, wherein The battery cell comprises a shell and an electrode assembly, the electrode assembly is arranged in the shell, and the shell is provided with a mounting hole; wherein the pole portion is entirely covered outside the mounting hole, or part of the pole portion is covered outside the mounting hole, and part of the pole portion penetrates into the shell through the mounting hole and cooperates with the shell; The pole portion is electrically connected with the electrode assembly. The battery device according to claim 29, wherein The shell comprises a shell body and an end cover, the shell body has an opening, and the end cover is sealingly covered on the opening; the pole portion is arranged in any one of the shell body and the end cover. The battery device according to any one of claims 1 to 28, wherein The battery cell has two first side walls opposite in the first direction, two second side walls opposite in a second direction, and two third side walls opposite in a third direction, the first direction, the second direction, and the third direction are perpendicular to each other, the pole portion is arranged on the first side wall, and the areas of the second side wall and the third side wall are greater than the area of the first side wall; or the areas of the second side wall and the third side wall are less than the area of the first side wall. The battery device according to claim 31, wherein The battery cell comprises a shell and an electrode assembly arranged in the shell; the pole post part is arranged on the shell, and the tab of the electrode assembly is electrically connected with the pole post; The electrode assembly is arranged to form a gap between the end of the tab and the shell, and the tab is arranged in the gap; the pole post part is arranged at a position opposite to the gap on the shell. The battery device according to claim 31, wherein The battery cell comprises a pressure relief mechanism arranged on one of the two second side walls and the two third side walls, and the pressure relief mechanism is used to break when the pressure inside the battery cell exceeds a pressure threshold. The battery device according to any one of claims 1 to 28, wherein The battery device comprises a sampling member which is in direct contact with the pole post part to collect parameter information of the corresponding battery cell. The battery device according to claim 34, wherein The contact mode of the sampling member with the pole post part comprises at least one of the following: The sampling member is in contact with at least one of the two connected pole post parts in the axial direction of the pole post part; The sampling member is in contact with at least one of the two connected pole post parts in the circumferential direction of the pole post part; The sampling member is in contact with at least one of the two connected pole post parts in the radial direction of the pole post part. The battery device according to claim 34, wherein The connecting post comprises a connecting post body and a sampling part, the connecting post body is respectively inserted with the pole post part of the adjacent two battery cells, and the sampling part is arranged on the connecting post body and forms the sampling member. The battery device of claim 36, wherein 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 are respectively in abutment with the two pole post parts matched in electrical connection. The battery device according to claim 37, wherein The sampling part comprises a connecting structure and a sleeving structure, the sleeving structure is matched with the connecting structure, the sleeving structure is sleeved on the outside of the connecting post body, the pole post part comprises a first pole post and a second pole post with opposite polarities, the two side surfaces of the sleeving structure are respectively in abutment with the first pole post and the second pole post; the connecting structure is connected with the output line of sampling. The battery device of claim 38, wherein The sleeving structure comprises a sleeving plate, a second through hole is formed in the sleeving plate, and the sleeving plate is sleeved on the insertion part through the second through hole. The battery device of claim 39, wherein The number of the sleeving plates is two, and the two sleeving plates are arranged at intervals on the connecting structure, one of the two sleeving plates is in abutment with the second pole post, and the other of the two sleeving plates is in abutment with the first pole post. The battery device of claim 39, wherein The sleeving structure further comprises an elastic pad arranged on one side of the sleeving plate, the elastic pad is provided with a through hole matched with the second through hole, and the sleeving plate and the elastic pad are sleeved on the insertion part through the second through hole and the through hole; the elastic pad is in abutment with the first pole post, and the side of the sleeving part away from the elastic pad is in abutment with the second pole post. The battery device of claim 39, wherein The peripheral edge of the sleeving plate where the second through hole is formed is provided with an elastic ring, and the sleeving plate is sleeved on the insertion part through the elastic ring. The battery device according to any one of claims 1 to 28, wherein The battery device further comprises a box body, a first expansion beam and a second expansion beam; the first expansion beam and the second expansion beam are arranged in a spaced manner and jointly define a battery compartment with the box body; a plurality of battery monomers are sequentially arranged in the battery compartment, and the battery monomers at the ends are respectively matched with the first expansion beam and the second expansion beam. Alternatively, The battery device further comprises a box body, a module shell and a mounting beam; the plurality of battery monomers are arranged in the module shell; and the module shell is mounted in the box body through the mounting beam. A battery cell, wherein, The battery monomer comprises: a shell, the shell comprising two first side walls opposite to each other; an electrode assembly arranged in the shell, the electrode assembly comprising a tab arranged close to the edge of the first side wall; and a pole part arranged close to the edge of the first side wall where the tab is located and electrically connected with the tab, the pole part being formed with a plug-in part protruding relative to the first side wall or a plug-in groove recessed towards the inside of the shell, the plug-in part or the plug-in groove being plugged with an electric connection pole to electrically connect the battery monomer with the electric connection pole. An electric power utilization device, wherein, The battery device of any one of claims 1-43 is used to provide electric energy; or The battery monomer of claim 44 is used to provide electric energy. The power consuming device according to claim 45, wherein The electric device is a vehicle, the battery device comprises a box body, and a plurality of battery monomers are arranged in the box body; at least a part of the chassis of the vehicle constitutes an upper cover of the box body.

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