Battery module and battery cell structure thereof

Abstract

The utility model provides a battery module and a battery cell structure thereof, and relates to the field of batteries, the battery cell structure comprises a shell, a cover body, a positive pole column and a negative pole column, the cover body and the shell are cooperatively installed to form a containing cavity, the containing cavity is used for containing a battery cell main body, and the positive pole column and the negative pole column are arranged in the containing cavity; one side, deviating from the accommodating cavity, of the cover body is provided with a first mounting area and a second mounting area, the number of the positive poles is at least two, the positive poles are arranged on the first mounting area along a first preset direction, the positive poles are connected in parallel, the number of the negative poles is at least one, and the negative poles are arranged on the second mounting area along a second preset direction. The negative poles are arranged on the second mounting area, and the number of the negative poles is smaller than that of the positive poles. The resistance value of the positive electrode of the battery cell structure can be reduced, so that the condition that the temperature of a positive electrode battery cell area is far higher than that of a negative electrode battery cell area under the condition of high-rate charging and discharging can be improved, the temperature balance of the battery cell structure is improved, and the cycle life of the battery cell structure can be effectively prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of batteries, in particular to a battery module and a cell structure thereof. BACKGROUND

[0002] A battery is a device for energy conversion and storage, which mainly converts chemical energy or physical energy into electrical energy through chemical reaction. Batteries have been widely used in the fields of electronic products, vehicles, energy storage systems, etc.

[0003] In the related battery, there is an uneven temperature distribution problem in the use process, which affects the service life of the battery. CONTENT OF THE UTILITY MODEL

[0004] In order to overcome the deficiencies in the prior art, the present application provides a battery module and a cell structure thereof.

[0005] In a first aspect, the present application provides a cell structure, comprising: a shell, a cover, a positive pole and a negative pole, the cover and the shell are cooperatively installed to jointly define a receiving cavity, the receiving cavity is used for accommodating a cell body, the cover is provided with a first mounting area and a second mounting area on a side away from the receiving cavity, the number of the positive poles is at least two, each of the positive poles is arranged on the first mounting area along a first preset direction, and each of the positive poles is connected in parallel, the number of the negative poles is at least one, each of the negative poles is arranged on the second mounting area along the first preset direction, and the number of the negative poles is less than the number of the positive poles.

[0006] In combination with the first aspect, in a possible implementation manner, there is a first preset interval between two adjacent positive poles, there is a second preset interval between the adjacent positive pole and the negative pole, and the second preset interval is greater than the first preset interval.

[0007] In combination with the first aspect, in a possible implementation manner, the at least two positive poles comprise a first positive pole and a second positive pole, the first positive pole and the second positive pole are connected in parallel, and there is the first preset interval between the first positive pole and the second positive pole, the at least one negative pole comprises a first negative pole, and there is the second preset interval between the first negative pole and the first positive pole or the second positive pole.

[0008] In combination with the first aspect, in a possible implementation manner, a length of the cover along the first preset direction is L1, a length of the first positive pole along the first preset direction is R1, and 0.1120≤R1 / L1≤0.1125, a length of the first negative pole along the first preset direction is R2, and 1≤R1 / R2≤2.

[0009] With reference to the first aspect, in a possible implementation of the first aspect, the first mounting area is arranged opposite to the second mounting area, the first mounting area has a first preset projection surface along a second preset direction, the second mounting area has a second preset projection surface along the second preset direction, the first preset projection surface is larger than the first preset projection surface, and the second preset direction is perpendicular to the first preset direction.

[0010] With reference to the first aspect, in a possible implementation of the first aspect, the cover body has a length L2 along a third preset direction, and 0.3087≤L2 / L1≤0.3137, the third preset direction is perpendicular to the second preset direction, and the third preset direction is perpendicular to the first preset direction.

[0011] With reference to the first aspect, in a possible implementation of the first aspect, a detachable structure is arranged on each of the positive electrode column and / or each of the negative electrode column, and the detachable structure is detachably connected with the aluminum bar.

[0012] In a second aspect, the application provides a battery module, which comprises an end plate assembly, a connecting assembly, a fire-fighting assembly, a drying assembly, and a plurality of the battery cell structures described above, the plurality of the battery cell structures are arranged side by side to form a battery cell group, the end plate assembly is arranged on two opposite sides of the battery cell group, the connecting assembly connects the two end plate assemblies and forms a first accommodating space with the end plate assemblies, the first accommodating space is adapted to the shape of the battery cell group, and the end plate assembly has a storage cavity, and the fire-fighting assembly and / or the drying assembly are accommodated in the storage cavity.

[0013] With reference to the second aspect, in a possible implementation of the second aspect, the end plate assembly comprises a limiting plate and a cover plate, one side of the limiting plate away from the battery cell group has a second accommodating space, and the cover plate is arranged on the limiting plate and at least partially seals the second accommodating space to form the storage cavity.

[0014] With reference to the second aspect, in a possible implementation of the second aspect, the end plate assembly further comprises a mounting plate, the mounting plate is arranged in the second accommodating space, the mounting plate is located between the limiting plate and the cover plate, the mounting plate is detachably connected with the limiting plate, the mounting plate has a mounting position, the fire-fighting assembly and / or the drying assembly are mounted in the mounting position, the cover plate is provided with a flow guide channel, and the cover plate is detachably connected with the mounting plate.

[0015] Compared with the prior art, the application has the following beneficial effects:

[0016] The positive pole column is arranged on the first mounting area of the pole end along a first preset direction, the number of the negative pole column is at least one, each negative pole column is arranged on the second mounting area of the pole end along the first preset direction, and the number of the negative pole column is less than the number of the positive pole column. Due to the difference between the chemical systems of the positive pole and the negative pole, the resistivity of the positive pole of the battery cell structure is higher than that of the negative pole. When the battery cell structure is in a large-rate charging and discharging working condition, the temperature of the battery cell area near the positive pole column is much higher than that of the battery cell area near the negative pole column. Compared with a single positive pole column battery cell, the application sets multiple positive pole columns to reduce the resistance value of the positive pole of the battery cell structure, thereby improving the condition that the temperature of the positive pole battery cell area is much higher than that of the negative pole battery cell area in a large-rate charging and discharging condition, improving the temperature balance of the battery cell structure, and effectively improving the cycle life of the battery cell structure. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0018] Figure 1 The overall structure schematic diagram of the battery module is shown;

[0019] Figure 2 The exploded schematic diagram of the battery module is shown;

[0020] Figure 3 The overall structure schematic diagram of the battery cell structure is shown;

[0021] Figure 4 The structure schematic diagram of the detachable structure of the battery cell structure is shown;

[0022] Figure 5 The structure schematic diagram of the conductive assembly of the battery module is shown;

[0023] Figure 6 The structure schematic diagram of the first insulating piece of the battery module is shown;

[0024] Figure 7 The structure schematic diagram of the connecting assembly of the battery module is shown;

[0025] Figure 8 The structure schematic diagram of the end plate assembly of the battery module is shown;

[0026] Figure 9 The structure schematic diagram of the limiting plate of the battery module is shown;

[0027] Figure 10 A structural schematic diagram of a mounting plate of a battery module is shown.

[0028] Main element symbol explanation:

[0029] 100 - battery cell group; 110 - battery cell structure; 111 - shell; 112 - cover; 112a - first mounting area; 112b - second mounting area; 113 - positive pole; 114 - negative pole; 115 - detachable structure;

[0030] 200 - end plate assembly; 210 - limiting plate; 211 - limiting part; 212 - first enclosing part; 212a - wire passage; 213 - second containing space; 214 - connecting part; 220 - cover plate; 221 - flow guiding passage; 230 - mounting plate; 231 - bearing part; 232 - second enclosing part; 233 - extending part; 240 - open cavity; 241 - first opening; 242 - second opening;

[0031] 300 - connecting assembly; 310 - connecting piece; 311 - connecting end; 320 - insulating sleeve;

[0032] 400 - fire-fighting assembly;

[0033] 500 - drying assembly;

[0034] 600 - insulating assembly; 610 - first insulating piece; 611 - first insulating part; 612 - second insulating part; 620 - second insulating piece; 630 - third insulating piece; 640 - fourth insulating piece;

[0035] 700 - detection assembly;

[0036] 800 - conductive assembly; 810 - aluminum row; 820 - support;

[0037] 900 - first containing space. DETAILED DESCRIPTION

[0038] Embodiments of the present application are described in detail below with reference to the attached drawings, which show examples of the embodiments. The same or similar elements or elements having the same or similar functions are denoted throughout the drawings by the same or similar reference numerals, and a description thereof will not be repeated. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and should not be understood as limiting the present application.

[0039] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0040] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0041] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, it 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 present application can be understood according to the specific circumstances.

[0042] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0043] Please refer to Figure 1 and Figure 3The embodiment of the present application provides a kind of electric core structure 110, the electric core structure 110 includes: shell 111, cover 112, positive pole 113 and negative pole 114.The cover 112 is cooperatively installed with the shell 111 to jointly define the formation containing cavity, the containing cavity is used to accommodate electric core body, the side of the cover 112 deviating from the containing cavity is provided with first installation area 112a and second installation area 112b.The number of the positive pole 113 is two, and the two positive pole 113 is arranged on the first installation area 112a along the first preset direction.The number of the negative pole 114 is one, and the negative pole 114 is arranged on the second installation area 112b along the first preset direction.The first preset direction is Figure 3 X direction in. Compared with the electric core of single positive pole 113, the present application is arranged with two positive pole 113, so as to reduce the resistance value of the positive pole of the electric core structure 110, to improve the situation that the temperature of positive pole electric core area is much higher than that of negative pole electric core area under the condition of large rate charge and discharge, improve the temperature balance of the electric core structure 110, and effectively improve the cycle life of the electric core structure 110.

[0044] In other embodiments, the number of the positive pole 113 can also be set to three, four, five, six and the like according to actual needs, and the number of the negative pole 114 can also be set to two, three, four, five and the like according to actual needs, and the number of the negative pole 114 is less than the number of the positive pole 113.

[0045] It can be understood that, due to the difference of chemical system of positive pole and negative pole, the resistivity of the positive pole of the electric core structure 110 is higher than that of the negative pole, and when the electric core structure 110 is in the working condition of large rate charge and discharge, the temperature of the electric core area near the positive pole 113 is much higher than that of the electric core area near the negative pole 114, resulting in that the temperature distribution of the electric core structure 110 is unbalanced, thereby affecting the chemical balance consistency of the electric core structure 110, and further affecting the cycle life of the electric core structure 110, and by arranging multiple positive poles 113, the problem that the temperature difference between positive pole and negative pole is too large during the working process of the electric core structure 110 can be improved, thereby improving the cycle life of the electric core structure 110.

[0046] In some embodiments, there is a first preset interval between two adjacent positive poles 113.There is a second preset interval between the positive pole 113 and the negative pole 114.The second preset interval is greater than the first preset interval.

[0047] In some embodiments, the two positive poles 113 include: first positive pole and second positive pole.The first positive pole and the second positive pole are connected in parallel, and there is the first preset interval between the first positive pole and the second positive pole.

[0048] In some embodiments, the one negative pole 114 comprises a first negative pole. The first negative pole has the second preset distance from the first positive pole or the second positive pole. The first positive pole has a length R1 along the first preset direction. The first negative pole has a length R2 along the first preset direction, and R1 / R2=1-2.

[0049] Further, R1=R2=18mm.

[0050] In some embodiments, the cover 112 has a length L1 along the first preset direction, and 0.1120≤R1 / L1≤0.1125.

[0051] In some embodiments, the first mounting area 112a is opposite to the second mounting area 112b, and the first mounting area 112a has a first preset projection area along a second preset direction. The second preset direction is the Y direction in Figure 3 , and the second preset direction is perpendicular to the first preset direction. The second mounting area 112b has a second preset projection area along the second preset direction. The first preset projection area is greater than the second preset projection area.

[0052] In some embodiments, the cover 112 has a length L2 along a third preset direction, and 0.3087≤L2 / L1≤0.3137. The third preset direction is the Z direction in Figure 3 , and the third preset direction is perpendicular to the second preset direction and the first preset direction.

[0053] In some embodiments, the shell 111 has a length L3 along the second preset direction, and L3=115.43±0.5mm. L1=160.35±0.3mm. L2=49.90±0.3mm.

[0054] It can be understood that by setting the size of the shell 111 and the cover 112, the energy density of the battery cell structure 110 is improved, and the space utilization is improved.

[0055] Please refer to Figure 4 In some embodiments, the first positive pole, the second positive pole, and the first negative pole are provided with a detachable structure 115. The detachable structure 115 is detachably connected with the aluminum row 810.

[0056] In some embodiments, the first positive pole and the second positive pole are provided with the detachable structure 115, or the first negative pole is provided with the detachable structure 115.

[0057] In some embodiments, the detachable structure 115 is a bolted structure, that is, a screw is arranged on each of the first positive electrode post, the second positive electrode post and the first negative electrode post, and a nut is arranged on each of the first positive electrode post, the second positive electrode post and the first negative electrode post, and the nut is matched with the screw. During the installation of the aluminum row 810, the aluminum row 810 is sleeved on the screw, then the nut is sleeved on the screw, and the nut is tightened to lock the aluminum row 810. Compared with the traditional welding connection mode of the electrode post and the aluminum row, the application connects the electrode post and the aluminum row through the detachable structure, improves the disassembly and assembly efficiency, and improves the recycling rate of the battery cell structure 110.

[0058] In other embodiments, the detachable structure 115 can also be a buckle structure, a latch structure, etc., which will not be enumerated and described here.

[0059] Please refer to Figure 1 and Figure 2 The application also provides a battery module, which comprises an end plate assembly 200, a connecting assembly 300, a fire-fighting assembly 400, a drying assembly 500, an insulation assembly 600, a detection assembly 700, a conductive assembly 800 and a plurality of battery cell structures 110 according to any one of the above embodiments, so it has all the beneficial effects of the battery cell structure 110 in any one of the above embodiments, which will not be described here.

[0060] In some embodiments, a plurality of battery cell structures 110 are arranged side by side along the third predetermined direction to form a battery cell group 100.

[0061] Please refer to Figure 1 and Figure 2 In some embodiments, the end plate assembly 200 is arranged on two opposite sides of the battery cell group 100. The connecting assembly 300 connects two end plate assemblies 200 and forms a first accommodating space 900 with the end plate assemblies 200, which is adapted to the shape of the battery cell group 100.

[0062] It can be understood that through the cooperation of the end plate assembly 200 and the connecting assembly 300, the battery cell structure 110 can be restrained to effectively resist the thermal expansion of the battery cell structure 110 during operation, thereby ensuring the electrical performance of the battery cell structure 110 and reducing the probability of safety accidents such as fire and explosion caused by the expansion of the battery cell structure 110.

[0063] In some embodiments, the end plate assembly 200 has a storage cavity. The fire-fighting assembly 400 and the drying assembly 500 are respectively accommodated in the corresponding storage cavity.

[0064] It can be understood that the end plate assembly 200 can play a role of binding the cell structure 110 to prevent free expansion of the cell structure 110, and can provide a housing space for the fire extinguishing assembly 400 and the drying assembly 500, thereby improving the space utilization and the energy density of the battery module.

[0065] In some embodiments, the drying assembly 500 is a block-shaped desiccant. During disassembly and assembly of the battery module, the drying assembly 500 can absorb the hot gas to improve the condensation phenomenon, that is, effectively control the generation of condensation during maintenance of the battery module, and reduce the safety hazard during maintenance of the battery module.

[0066] In some embodiments, the conductive assembly 800 is arranged at one end of the cell group 100 close to the pole end 111. The detection assembly 700 is arranged on the conductive assembly 800, the detection assembly 700 is connected with the fire extinguishing assembly 400, and the detection assembly 700 is used for real-time detection of the temperature of the cell group 100 and driving the operation of the fire extinguishing assembly 400.

[0067] Please refer to Figure 2 and Figure 5 In some embodiments, the conductive assembly 800 includes an aluminum row 810 and a bracket 820. The aluminum row 810 is arranged on the bracket 820, and the aluminum row 810 is used for connecting each cell structure 110. The bracket 820 is arranged at one end of the cell group 100 close to the pole end 111.

[0068] In some embodiments, the detection assembly 700 is a thermal sensitive wire, and the detection assembly 700 is arranged on the bracket 820 along the third preset direction, and the detection assembly 700 is connected with the fire extinguishing assembly 400. The fire extinguishing assembly 400 is a block-shaped fire extinguishing core. When the temperature detected by the detection assembly 700 exceeds a preset temperature, the fire extinguishing assembly 400 starts the jet fire extinguishing action, so as to effectively reduce the probability of fire and reduce the accident loss.

[0069] In some embodiments, the preset temperature is 160-180℃.

[0070] Please refer to Figure 2 and Figure 6In some embodiments, the insulation assembly 600 comprises a first insulation member 610, a second insulation member 620, a third insulation member 630 and a fourth insulation member 640. The first insulation member 610 is arranged between the end plate assembly 200 and the cell group 100, and at least partially adheres to two opposite sides of the cell, so that the connection assembly 300 is located on the side of the first insulation member 610 away from the cell. The second insulation member 620 is arranged between two adjacent cells. The third insulation member 630 is arranged on the aluminum row 810. The fourth insulation member 640 is arranged at the end of the cell group 100 away from the third insulation member 630.

[0071] In some embodiments, the first insulation member 610 comprises a first mica plate layer and a first foam layer, and the first mica plate layer and the first foam layer are adhered.

[0072] Please refer to Figure 6 In some embodiments, the first insulation member 610 comprises a first insulation part 611 and a second insulation part 612. The first insulation part 611 is arranged along a second preset direction. The first insulation part 611 is located between the cell group 100 and the end plate assembly 200, and adheres to the end plate assembly 200 and one side of the cell structure 110. The second insulation part 612 is arranged on two opposite sides of the first insulation part 611 along the third preset direction, and is connected to the first insulation part 611, and adheres to two opposite sides of the cell structure 110 away from the first insulation part 611.

[0073] In some embodiments, the second insulation member 620 has the same shape as the first insulation part 611, and is square. The second insulation member 620 comprises a second mica plate layer and a second foam layer, and the second mica plate layer and the second foam layer are adhered.

[0074] It can be understood that the mica plate can not only insulate but also prevent the spread of thermal runaway, thereby improving the safety of the cell group 100 during use. The foam can fill the gap between two adjacent cell structures 110 and also has a buffering effect.

[0075] In some embodiments, the third insulation member 630 is a square insulation sheet, which is clamped on the support 820 and covers the aluminum row 810 to prevent external metal from contacting the aluminum row 810 and causing short circuit.

[0076] In some embodiments, the fourth insulation piece 640 is arranged opposite to the third insulation piece 630, and the fourth insulation piece 640 is a square insulation piece. The fourth insulation piece 640 can protect the battery cell group 100 and enhance insulation.

[0077] Referring to Figure 7 In some embodiments, the connecting assembly 300 comprises a connecting piece 310 and an insulation sleeve 320. The connecting piece 310 is arranged along the third preset direction, and the connecting piece 310 is a sheet metal piece. The connecting piece 310 comprises connecting ends 311. The connecting ends 311 are located at both ends of the connecting piece 310. The connecting ends 311 are connected to the end plate assembly 200 through the bolt connecting piece 310, so that the connecting ends 311 are detachably connected to the end plate assembly 200. The insulation sleeve 320 is sleeved on the connecting piece 310, and the insulation sleeve 320 is located at the middle end of the connecting piece 310. The insulation sleeve is made of plastic material.

[0078] It can be understood that, through cooperation of the insulation sleeve 320 and the second insulation part 612, the connecting piece 310 and the battery cell group 100 are insulated and isolated.

[0079] In other embodiments, the connecting piece 310 is a steel strip.

[0080] Referring to Figure 8 and Figure 9 In some embodiments, the end plate assembly 200 is a sheet metal piece, and the end plate assembly 200 comprises a limiting plate 210, a cover plate 220, and a mounting plate 230. The limiting plate 210 has a second accommodating space 213 on the side away from the battery cell group 100. The cover plate 220 is arranged on the limiting plate 210 to form the storage cavity with the limiting plate 210. The cover plate 220 is detachably connected to the limiting plate 210. The cover plate 220 is provided with a flow guide passage 221. The mounting plate 230 is arranged in the second accommodating space 213. The mounting plate 230 is located between the limiting plate 210 and the cover plate 220. The mounting plate 230 is detachably connected to the limiting plate 210. The mounting plate 230 is detachably connected to the cover plate 220. The mounting plate 230 has a mounting position. The fire-fighting assembly 400 and the drying assembly 500 are mounted in the mounting position.

[0081] In other embodiments, the end plate assembly 200 comprises a limiting plate 210 and a cover plate 220. The limiting plate 210 has a second accommodating space 213 on the side away from the battery cell group 100. The cover plate 220 is arranged on the limiting plate 210 and seals the second accommodating space 213 to form a sealed storage cavity, and the cover plate 220 and the limiting plate 210 are welded together. The fire-fighting assembly 400 is a fire-fighting liquid, such as perfluorocyclohexanone.

[0082] It can be understood that when the temperature detected by the detection assembly 700 exceeds the preset temperature, the fire-fighting gas sprayed by the fire-fighting assembly 400 is sprayed through the flow guide channel 221.

[0083] Referring to Figure 9 In some embodiments, the limiting plate 210 comprises a limiting portion 211, a first enclosing portion 212, and a connecting portion 214. The limiting portion 211 is attached to the battery cell group 100. The first enclosing portion 212 is arranged around the periphery of the limiting portion 211 and is connected to the side of the limiting portion 211 away from the battery cell group 100 to form the second accommodating space 213. The connecting portion 214 is arranged in the second accommodating space 213, and the connecting portion 214 is arranged along the edge of the first enclosing portion 212. The cover plate 220 is detachably connected to the connecting portion 214. The connecting end 311 is connected to the first enclosing portion 212 by a bolt connector 310.

[0084] In some embodiments, the first insulating portion 611 is attached to the side of the limiting portion 211 away from the first enclosing portion 212 to form an insulating isolation layer between the battery cell group 100 and the limiting portion 211.

[0085] Referring to Figure 9 In some embodiments, the first enclosing portion 212 is provided with a wire passage 212a. The detection assembly 700 passes through the wire passage 212a and is connected to the fire-fighting assembly 400.

[0086] It can be understood that through the cooperation of the limiting portion 211 and the first enclosing portion 212, the fire-fighting assembly 400 can be provided with a storage space, and the detection assembly 700 can be provided with the wire passage 212a, thereby providing a connection passage for the detection assembly 700 and the fire-fighting assembly 400, further improving the space utilization, improving the energy density of the battery module, and assembling the detection assembly 700 on the battery cell group 100 to improve the timeliness of the response of the fire-fighting assembly 400.

[0087] In some embodiments, the limiting portion 211 is square. The first enclosing portion 212 is annular, and the central axis of the first enclosing portion 212 coincides with the central axis of the limiting portion 211.

[0088] In some embodiments, the first enclosing portion 212 has a first preset length in the third preset direction. The connecting portion 214 has a first preset length in the third preset direction. The second preset length is smaller than the first preset length, so as to provide installation space for the cover plate 220.

[0089] In some embodiments, the installation plate 230 is recessed towards the cover plate 220, so as to form a recess. The installation site is arranged in the recess.

[0090] Referring to Figure 10 In some embodiments, the recess has an open cavity 240. The installation site is arranged in the open cavity 240. The fire-fighting assembly 400 is installed in the installation site, so that the fire-fighting assembly 400 is at least partially exposed to the adjacent two wall surfaces of the installation plate 230.

[0091] Referring to Figure 10 In some embodiments, the open cavity 240 has a first opening 241 and a second opening 242. The first opening 241 is arranged at one end of the installation plate 230 close to the cover plate 220, and has the same orientation as the slot of the recess. The second opening 242 is arranged on the two opposite sides of the installation plate 230 in the third preset direction. The structure of the three open sides of the installation plate 230 increases the space for taking and placing the fire-fighting assembly 400 and the drying assembly 500, and improves the convenience of assembling the fire-fighting assembly 400 and the drying assembly 500.

[0092] Referring to Figure 10 In some embodiments, the installation plate 230 comprises a bearing portion 231, a second enclosing portion 232, and an extension portion 233. The bearing portion 231 is arranged opposite to the cover plate 220, and is used for bearing the fire-fighting assembly 400 and the drying assembly 500. The second enclosing portion 232 is arranged on the two opposite sides of the bearing portion 231, and is connected with the bearing portion 231 to form the recess. The extension portion 233 is arranged at one end of the second enclosing portion 232 away from the bearing portion 231, and is arranged to extend away from the second enclosing portion 232. The extension portion 233 is detachably connected with the connecting portion 214.

[0093] In some embodiments, the extension part 233 is connected with the connecting part 214 through a bolted connection 310, so that the extension part 233 is detachably connected with the connecting part 214. The cover plate 220 is connected with the extension part 233 and the connecting part 214 through the bolted connection 310, so that the cover plate 220 is detachably connected with the extension part 233, and the cover plate 220 is detachably connected with the connecting part 214.

[0094] By cooperation of the limiting plate 210, the cover plate 220 and the mounting plate 230, on one hand, the safety accident probability caused by expansion of the battery cell group 100 can be reduced, and on the other hand, the assembly space for the fire-fighting assembly 400 and the drying assembly 500 can be provided, and the connection channel for the detection assembly 700 and the fire-fighting assembly 400 can be provided, so that the space utilization rate is improved, and the energy density of the battery module is improved. In addition, the fire-fighting core is accommodated in the end plate assembly 200, which is conducive to assembling the detection assembly 700 on the battery cell group 100, so that the timeliness of the fire-fighting assembly 400 is improved.

[0095] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, different embodiments or examples described in the present specification and the features of different embodiments or examples can be combined and modified by those skilled in the art without contradiction.

[0096] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. An electric cell structure, characterized by comprising: The application relates to a battery cell structure, which comprises a shell, a cover body, at least two positive electrode columns and at least one negative electrode column. The cover body is arranged on the shell to jointly define a containing cavity for accommodating a battery cell body. The first mounting area and the second mounting area are oppositely arranged. The first positive electrode column and the second positive electrode column are arranged in parallel. The first negative electrode column is arranged between the first positive electrode column and the second positive electrode column.

2. The cell structure of claim 1, wherein, The length of the cover body along the first preset direction is L1.

3. The cell structure of claim 2, wherein, The length of the first positive electrode column along the first preset direction is R1. The length of the first negative electrode column along the first preset direction is R2.

4. The cell structure of claim 3, wherein, The first mounting area and the second mounting area are oppositely arranged.

5. The cell structure of claim 1, wherein, The first mounting area has a first preset projection surface along a second preset direction.

6. The cell structure of claim 5, wherein, The second mounting area has a second preset projection surface along the second preset direction.

7. The cell structure of any one of claims 1-6, wherein, The length of the cover body along a third preset direction is L2.

8. A battery module, characterized by The third preset direction is perpendicular to the second preset direction and the first preset direction.

9. The battery module of claim 8, wherein, The positive electrode column and / or the negative electrode column are provided with a detachable structure which is detachably connected with an aluminum row. The application relates to an end plate assembly, a connecting assembly, a fire-fighting assembly, a drying assembly and a plurality of battery cell structures. The end plate assembly comprises a limiting plate and a cover plate.

10. The battery module of claim 9, wherein, The limiting plate has a second containing space on the side away from the battery cell group. The cover plate is arranged on the limiting plate and at least partially seals the second containing space to form the storage cavity. The end plate assembly further comprises a limiting plate and a cover plate. A mounting plate is arranged in the second accommodating space, the mounting plate is located between the limiting plate and the cover plate, the mounting plate is detachably connected with the limiting plate, the mounting plate has a mounting position, the fire-fighting assembly and / or the drying assembly are mounted in the mounting position, the cover plate is provided with a flow guide channel, and the cover plate is detachably connected with the mounting plate.

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