Battery cell lower hot pressing mechanism and battery cell hot pressing device

Abstract

The utility model discloses a battery cell lower hot pressing mechanism and a battery cell hot pressing device.The battery cell lower hot pressing mechanism comprises a base plate, a lower hot pressing plate, a lower isolating membrane assembly and an auxiliary bearing assembly, the lower hot pressing plate is installed on the upper end face of the base plate, and the bearing face of the lower hot pressing plate is of an integral plane structure; the lower isolating membrane assembly comprises a first driving assembly, a lower isolating membrane and a fixing assembly, the lower isolating membrane is located above the lower hot pressing plate, the fixing assembly is configured to fix the two side edges of the lower isolating membrane, and the first driving assembly is configured to drive the fixing assembly to ascend and descend so as to drive the lower isolating membrane fixed by the fixing assembly to ascend and descend; the auxiliary bearing assembly comprises a second driving assembly and a bearing piece, and the second driving assembly is configured to drive the bearing piece to move into or out of the position between the lower isolating membrane and the lower hot pressing plate. The bearing surface of the lower hot pressing plate of the battery cell lower hot pressing mechanism is of an integral plane structure, so that indentations are prevented from being formed on the surfaces of the battery cell units during hot pressing, and the hot pressing effect and the hot pressing quality of the battery cell units are ensured.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of lithium battery manufacturing equipment, in particular to a lower hot-pressing mechanism of a battery cell and a battery cell hot-pressing device. BACKGROUND

[0002] The lithium battery cell is formed by stacking positive electrode sheets, negative electrode sheets and separators in sequence into a battery cell unit and then hot-pressing the battery cell unit into a complete body by a hot-pressing device.

[0003] The hot-pressing device generally comprises an upper hot-pressing plate and a lower hot-pressing plate. After the lower hot-pressing plate receives the battery cell unit to be hot-pressed, the upper hot-pressing plate and the lower hot-pressing plate are close to each other to hot-press the battery cell unit to be hot-pressed into a shape. However, the lower hot-pressing plate of the existing hot-pressing device is generally provided in a split structure in order to cooperate with an external handling clamp to receive the battery cell unit to be hot-pressed. That is, a liftable receiving part is arranged on the lower hot-pressing plate. When the battery cell unit to be hot-pressed is received, the receiving part extends out of the lower hot-pressing plate to temporarily carry the battery cell unit to be hot-pressed. After the external handling clamp is withdrawn, the receiving part is lowered to place the battery cell unit to be hot-pressed on the lower hot-pressing plate. Obviously, there is an inevitable gap between the receiving part of the lower hot-pressing plate and the carrying surface of the lower hot-pressing plate in the split structure. During hot-pressing, a pressure mark may be formed on the surface of the battery cell unit, which affects the appearance and hot-pressing effect of the battery cell unit. CONTENT OF THE UTILITY MODEL

[0004] The application aims to provide a lower hot-pressing mechanism of a battery cell to solve the problem that the existing battery cell hot-pressing device may form a pressure mark on the surface of the battery cell unit during hot-pressing. Another purpose of the application is to provide a battery cell hot-pressing device comprising the lower hot-pressing mechanism of the battery cell.

[0005] To achieve the above purpose, the application adopts the following technical solutions:

[0006] In a first aspect, the application provides a lower hot-pressing mechanism of a battery cell, which comprises a base plate, a lower hot-pressing plate, a lower isolation film assembly and an auxiliary carrying assembly, wherein:

[0007] The lower hot-pressing plate is installed on the upper end face of the base plate and is configured to receive the battery cell unit to be hot-pressed. The receiving surface of the lower hot-pressing plate is an integral planar structure.

[0008] The lower isolation film assembly and the auxiliary carrying assembly are respectively installed on the base plate. The lower isolation film assembly comprises a first driving assembly, a lower isolation film and a fixing assembly. The lower isolation film is located above the lower hot-pressing plate and extends in the same direction as the lower hot-pressing plate. The fixing assembly is configured to fix the two side edges of the lower isolation film. The first driving assembly is configured to drive the fixing assembly to lift and lower, so as to drive the lower isolation film fixed by the fixing assembly to lift and lower.

[0009] The auxiliary bearing assembly comprises a second driving assembly and a bearing, the second driving assembly is configured to drive the bearing to move to between the lower isolation film and the lower hot pressing plate to bear the battery cell to be hot pressed, and the second driving assembly is further configured to move the bearing out of between the lower isolation film and the lower hot pressing plate to avoid the lower isolation film.

[0010] The battery cell lower hot pressing mechanism provided in the application drives the lower isolation film to rise to lift the battery cell by the first driving assembly, and drives the lower isolation film to descend to the lower hot pressing plate after the bearing is moved out of between the lower isolation film and the lower hot pressing plate, so that the battery cell is borne on the lower hot pressing plate; meanwhile, the bearing surface of the lower hot pressing plate is arranged as an overall planar structure, which avoids forming a pressure mark on the surface of the battery cell during hot pressing, does not affect the appearance of the battery cell, and ensures the hot pressing effect and quality of the battery cell.

[0011] Optionally, the fixing assembly comprises a first fixing member and a second fixing member, wherein:

[0012] The lower hot pressing plate is installed on the base plate along the first horizontal direction, the first fixing member and the second fixing member both extend along the first horizontal direction and are arranged on both sides of the lower isolation film respectively;

[0013] The first fixing member is configured to fix the first side edge of the lower isolation film, and the second fixing member is configured to fix the second side edge of the lower isolation film.

[0014] By arranging the first fixing member and the second fixing member extending along the first horizontal direction, the first side plate and the second side edge of the lower isolation film are stably and reliably fixed, and a stable and reliable fixing assembly is provided.

[0015] Optionally, the first driving assembly comprises two driving parts, two fixing seats and two lifting members, wherein:

[0016] The two fixing seats are respectively installed on the base plate and located outside the two ends of the lower hot pressing plate, the two lifting members are respectively installed on the corresponding fixing seats in a lifting manner, and the two ends of the first fixing member and the second fixing member are respectively installed on the two lifting members;

[0017] The two lifting members are both provided with a waist-shaped hole extending along the second horizontal direction, each driving part corresponds to a lifting member, and each driving part comprises a first driving member and a transmission cam, the driving end of the first driving member is connected with the transmission cam, the transmission cam is located in the corresponding waist-shaped hole, and the first driving member is configured to drive the transmission cam to rotate in the waist-shaped hole to drive the two lifting members to lift, and the first horizontal direction is perpendicular to the second horizontal direction.

[0018] By cooperating with two drive units, two fixed seats, and two lifting components, the synchronous and smooth lifting of the two lifting components is achieved; by cooperating with the first drive unit, the transmission cam, and the waist-shaped hole, the rotational motion of the transmission cam is converted into the lifting motion of the lifting component, providing a drive unit with high driving precision, good stability, fast lifting response, and long service life.

[0019] Optionally, the lower separator assembly also includes a tension control assembly configured to drive the first and second fasteners closer to or further apart from each other along a second horizontal direction to control the tension of the lower separator fixed by the first and second fasteners.

[0020] By setting up a tension control component, the tension of the lower separator membrane is controlled, ensuring that the lower separator membrane is always in a taut state.

[0021] Secondly, this application also proposes a cell hot pressing device, which includes a frame, at least one hot pressing section, and a second driving member, wherein:

[0022] At least one hot pressing section is mounted on the frame. Each hot pressing section can be switched to an open state or a hot pressing state. Each hot pressing section includes an upper hot pressing mechanism and the aforementioned lower hot pressing mechanism for the battery cell. The upper hot pressing mechanism includes an upper hot pressing plate.

[0023] The second driving component is configured to drive the upper hot pressing plate on all the hot pressing sections to move away from the corresponding lower hot pressing plate, so that all the hot pressing sections are in an open state, so as to receive the battery cell unit to be hot pressed by the external handling mechanism through the auxiliary bearing component.

[0024] The second driving component is also configured to drive the upper hot press plate of all the hot press sections to move closer to the corresponding lower hot press plate, so that all the hot press sections are in a hot press state to perform hot press on the battery cell unit supported on the lower hot press plate.

[0025] The second driving component, the upper hot press plate, and the lower hot press plate work together to achieve hot pressing of the battery cell unit supported on the lower hot press plate. The supporting surface of the lower hot press plate is set as an integral planar structure, which avoids the formation of indentations on the surface of the battery cell unit during hot pressing, and does not affect the appearance of the battery cell unit, thus ensuring the hot pressing effect and quality of the battery cell unit.

[0026] Optionally, the upper hot press mechanism may also include an upper release film assembly configured to secure and lay the upper release film on the bottom of the upper hot press plate.

[0027] By laying an upper separator between the upper hot press plate and the battery cell unit using an upper separator assembly, adhesion between the battery cell unit and the upper hot press plate can be prevented.

[0028] Optionally, the hot-pressing mechanism also includes a detection element configured to contact the tabs of the battery cell when hot-pressing is applied to the battery cell to conduct electricity to detect whether the battery cell is short-circuited.

[0029] By setting up detection components, automatic detection of whether the battery cell is short-circuited can be achieved during hot pressing.

[0030] Optionally, the cell hot pressing device includes at least two hot pressing sections, wherein:

[0031] At least two hot pressing sections are arranged sequentially on the frame along the vertical direction;

[0032] The substrate of the lowest hot pressing section is fixed on the frame, and the substrates of the remaining hot pressing sections are mounted on the frame in a liftable manner via sliding guide pairs;

[0033] The upper hot pressing mechanism located in the lower hot pressing section is mounted on the bottom surface of the substrate of the adjacent upper hot pressing section.

[0034] By setting at least two hot pressing sections, synchronous hot pressing of at least two battery cell units is achieved, improving hot pressing efficiency; at the same time, the upper hot pressing mechanism located in the lower hot pressing section is installed on the bottom surface of the substrate of the adjacent upper hot pressing section, simplifying the overall structure of the hot pressing device and reducing costs.

[0035] Optionally, the cell hot pressing device also includes a buffer limiting member that is matched with the hot pressing section. The buffer limiting member is installed on the substrate of each corresponding hot pressing section and is configured to limit the downward stroke of the upper hot pressing plate of the corresponding hot pressing section.

[0036] By setting a buffer limiter, the downward stroke limit of the upper hot platen is achieved, preventing the upper hot platen from falling too far and damaging the battery cell.

[0037] Optionally, the cell hot pressing device also includes a pressure control component that is matched with the hot pressing part. One end of the pressure control component is fixedly mounted on the substrate of the hot pressing part, and the other end of the pressure control component abuts against the substrate of the adjacent hot pressing part when the hot pressing part is in the hot pressing state, so as to control the pressing force of the corresponding hot pressing part.

[0038] By installing pressure control components on the hot pressing section, the clamping force of each hot pressing section can be controlled to ensure the consistency of the clamping force of each hot pressing section and improve the hot pressing quality of the battery cell unit. Attached Figure Description

[0039] Figure 1 This is an assembly diagram of the lower hot pressing plate and the lower separator assembly of the cell lower hot pressing mechanism provided in the embodiments of this application;

[0040] Figure 2This is a three-dimensional structural schematic diagram of the lower separator assembly of the cell lower hot pressing mechanism provided in the embodiments of this application;

[0041] Figure 3 This is a front view schematic diagram of the auxiliary support component of the cell under-heat pressing mechanism provided in the embodiments of this application;

[0042] Figure 4 This is a three-dimensional structural schematic diagram of the battery cell hot pressing device provided in the embodiments of this application;

[0043] Figure 5 This is a front view schematic diagram of the battery cell hot pressing device provided in the embodiments of this application;

[0044] Figure 6 This is a three-dimensional structural diagram of the upper hot pressing mechanism of the battery cell hot pressing device provided in the embodiments of this application.

[0045] Figures 1 to 6 The following reference numerals are included:

[0046] The cell lower hot pressing mechanism 10 includes: a substrate 11, a lower hot pressing plate 12, a lower separator assembly 13, a first drive assembly 130, a lower separator 131, a fixing assembly 132, a first fixing member 1320, a second fixing member 1321, a drive unit 133, a fixing seat 134, a lifting member 135, a waist-shaped hole 1350, a first cylinder 136, an auxiliary bearing assembly 14, a second drive assembly 140, a third cylinder 1400, a mounting seat 1401, a bearing member 141, and a pad 142.

[0047] Rack 20;

[0048] Hot pressing section 30: upper hot pressing mechanism 31, upper hot pressing plate 32, upper isolation membrane assembly 33, upper isolation membrane 34, and detection piece 35;

[0049] Second drive component 40;

[0050] Heating element 50, temperature measuring element 51, buffer limiting element 52, pressure control element 53. Detailed Implementation

[0051] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0052] A lithium battery cell is formed by stacking positive electrode plates, negative electrode plates, and separators in sequence, and then hot-pressing them into a whole using a hot-pressing device.

[0053] Hot pressing devices typically include an upper hot pressing plate and a lower hot pressing plate. After the lower hot pressing plate supports the battery cell to be hot pressed, the upper and lower hot pressing plates move closer together to hot press the battery cell to be hot pressed into shape. However, in order to cooperate with external handling grippers to support the battery cell to be hot pressed, the lower hot pressing plate of existing hot pressing devices is generally set as a split structure. That is, a liftable receiving part is set on the lower hot pressing plate. When supporting the battery cell to be hot pressed, the receiving part extends out of the lower hot pressing plate to temporarily support the battery cell to be hot pressed. After the external handling grippers are removed, the receiving part is lowered to place the battery cell to be hot pressed on the lower hot pressing plate. Obviously, there is an unavoidable gap between the receiving part and the bearing surface of the lower hot pressing plate in this split structure. During hot pressing, indentations may be formed on the surface of the battery cell, affecting the appearance of the battery cell and the hot pressing effect.

[0054] Therefore, in a first aspect, this application provides a cell under-heat pressing mechanism 10, please refer to... Figures 1 to 4 As shown, the battery cell lower hot-pressing mechanism 10 provided in this application embodiment includes a substrate 11, a lower hot-pressing plate 12, a lower separator assembly 13, and an auxiliary support assembly 14. The lower hot-pressing plate 12 is mounted on the upper surface of the substrate 11 and is configured to support the battery cell unit to be hot-pressed. The bearing surface of the lower hot-pressing plate 12 is an integral planar structure. The lower separator assembly 13 and the auxiliary support assembly 14 are respectively mounted on the substrate 11. The lower separator assembly 13 includes a first driving assembly 130, a lower separator 131, and a fixing assembly 132. The lower separator 131 is located above the lower hot-pressing plate 12 and its extending direction is the same as the extending direction of the lower hot-pressing plate 12. The fixing component 132 is configured to fix both sides of the lower isolation membrane 131, and the first drive component 130 is configured to drive the fixing component 132 to rise and fall, thereby driving the lower isolation membrane 131 fixed by the fixing component 132 to rise and fall; the auxiliary support component 14 includes a second drive component 140 and a support member 141. The second drive component 140 is configured to drive the support member 141 to move between the lower isolation membrane 131 and the lower hot press plate 12 to support the battery cell unit to be hot-pressed. The second drive component 140 is also configured to move the support member 141 out from between the lower isolation membrane 131 and the lower hot press plate 12 to avoid the descent of the lower isolation membrane 131.

[0055] As can be seen, the cell lower hot pressing mechanism 10 proposed in this application drives the lower isolation membrane 131 to rise through the first drive component 130 to lift the cell unit, and drives the lower isolation membrane 131 to fall onto the lower hot pressing plate 12 after the carrier 141 moves out from between the lower isolation membrane 131 and the lower hot pressing plate 12, so that the cell unit is supported on the lower hot pressing plate 12; at the same time, the bearing surface of the lower hot pressing plate 12 is set as an integral planar structure, which avoids the formation of indentations on the surface of the cell unit during hot pressing, does not affect the appearance of the cell unit, and ensures the hot pressing effect and hot pressing quality of the cell unit.

[0056] Please see Figure 1 and Figure 2 As shown, in one embodiment, the fixing component 132 includes a first fixing member 1320 and a second fixing member 1321, and the lower hot press plate 12 is along the first horizontal direction ( Figure 1 The first fixing member 1320 and the second fixing member 1321 are both extended along the first horizontal direction and are respectively disposed on both sides of the lower isolation membrane 131. The first fixing member 1320 is configured to fix the first side of the lower isolation membrane 131, and the second fixing member 1321 is configured to fix the second side of the lower isolation membrane 131.

[0057] Specifically, the first fixing member 1320 and the second fixing member 1321 are along a second horizontal direction perpendicular to the first horizontal direction. Figure 1 The first fixing member 1320 and the second fixing member 1321 are arranged side by side in the Y direction. Both the first fixing member 1320 and the second fixing member 1321 include two fixing plates extending along the first horizontal direction. The first side of the lower isolation membrane 131 is fixed between the two fixing plates of the first fixing member 1320, and the second side of the lower isolation membrane 131 is fixed between the two fixing plates of the second fixing member 1321.

[0058] As can be seen, by setting the first fixing member 1320 and the second fixing member 1321 extending along the first horizontal direction, the first side plate and the second side of the lower isolation membrane 131 are stably and reliably fixed, providing a stable and reliable fixing assembly 132.

[0059] In one embodiment, the first drive assembly 130 includes two drive units 133, two fixed seats 134, and two lifting members 135. The two fixed seats 134 are respectively mounted on the base plate 11 and located on the outer sides of both ends of the lower hot press plate 12. The two lifting members 135 are respectively movably mounted on the corresponding fixed seats 134. The two ends of the first fixed member 1320 and the second fixed member 1321 are respectively mounted on the two lifting members 135. Each of the two lifting members 135 has a section extending along the second horizontal direction ( Figure 1 The waist-shaped hole 1350 extends in the Y direction. Each drive part 133 corresponds to a lifting member 135. Each drive part 133 includes a first drive member and a transmission cam (not shown in the figure). The drive end of the first drive member is connected to the transmission cam. The transmission cam is located in the corresponding waist-shaped hole 1350. The first drive member is configured to drive the transmission cam with a non-circular cross section to rotate in the waist-shaped hole 1350 so as to abut against the corresponding lifting member 135 respectively, thereby driving the two lifting members 135 to rise and fall synchronously. The first horizontal direction is perpendicular to the second horizontal direction.

[0060] Specifically, the first driving component is a motor.

[0061] Specifically, a sliding guide pair consisting of a linear guide rail and a slider is provided between the lifting component 135 and the fixed base 134 to improve the smoothness of the lifting component 135's lifting.

[0062] As can be seen, the synchronous and smooth lifting of the two lifting components 135 is achieved through the cooperation of the two driving parts 133, the two fixed seats 134 and the two lifting components 135; through the cooperation of the first driving component, the transmission cam and the waist-shaped hole 1350, the rotational motion of the transmission cam is converted into the lifting motion of the lifting component 135, thus providing a driving part 133 with high driving accuracy, good stability, fast lifting response and long service life.

[0063] In one embodiment, the lower separator assembly 13 further includes a tension control assembly configured to drive the first fixing member 1320 and the second fixing member 1321 to move closer or further apart from each other along a second horizontal direction, so as to control the tension of the lower separator 131 fixed by the first fixing member 1320 and the second fixing member 1321.

[0064] Specifically, the tension control assembly includes two sets of tension cylinders. Each set of tension cylinders includes two first cylinders 136. The fixed end of the first set of first cylinders 136 is mounted on one of the lifting components 135, and the driving end of the first set of first cylinders 136 is connected to the first end of the first fixing component 1320 and the second fixing component 1321, respectively. The fixed end of the second set of first cylinders 136 is mounted on the other lifting component 135, and the driving end of the second set of first cylinders 136 is connected to the second end of the first fixing component 1320 and the second fixing component 1321, respectively. The two sets of first cylinders 136 control the first fixing component 1320 and the second fixing component 1321 to move closer to or further away from each other in the second horizontal direction.

[0065] As can be seen, by setting up a tension control component, the tension of the lower separator 131 is controlled, ensuring that the lower separator 131 is always in a taut state. Specifically, two sets of tension cylinders control the first fixing member 1320 and the second fixing member 1321 to move closer to each other along the second horizontal direction, thereby loosening the fixed lower separator 131 and facilitating the adjustment of the fixed position of the lower separator 131 during replacement; the two sets of tension cylinders also control the first fixing member 1320 and the second fixing member 1321 to move further apart along the second horizontal direction, thereby tensioning the fixed lower separator 131 and facilitating the support of the battery cell unit to be hot-pressed. During the hot-pressing process, the tension cylinders can adjust their own expansion and contraction according to the state of the lower separator 131 to ensure that the lower separator 131 is always in a taut state.

[0066] The cell under-heat pressing mechanism 10 proposed in this application has the following advantages:

[0067] 1) It avoids the formation of indentations on the surface of the battery cell during hot pressing, which will not affect the appearance of the battery cell and ensure the hot pressing effect and quality of the battery cell.

[0068] 2) The fixing component 132 enables stable and reliable fixing of the first and second sides of the lower isolation membrane 131.

[0069] 3) The first drive component 130 has high driving accuracy, good stability and long service life.

[0070] 4) The tension control component ensures that the lower isolation membrane 131 is always in a taut state.

[0071] Secondly, this application also proposes a cell hot-pressing device, please refer to [link to relevant documentation]. Figure 1 , Figure 4 and Figure 6 As shown in the embodiment of this application, a battery cell hot pressing device is proposed, including a frame 20, at least one hot pressing part 30, and a second driving member 40. At least one hot pressing part 30 is mounted on the frame 20. Each hot pressing part 30 can be switched to an open state or a hot pressing state. Each hot pressing part 30 includes an upper hot pressing mechanism 31 and the aforementioned lower hot pressing mechanism 10 for the battery cell. The upper hot pressing mechanism 31 includes an upper hot pressing plate 32. The second driving member 40 is configured to drive the upper hot pressing plates 32 on all hot pressing parts 30 to move away from the corresponding lower hot pressing plates 12, so that all hot pressing parts 30 are in an open state, so as to receive the battery cell unit to be hot pressed by the external handling mechanism through the auxiliary bearing assembly 14. The second driving member 40 is also configured to drive the upper hot pressing plates 32 of all hot pressing parts 30 to move closer to the corresponding lower hot pressing plates 12, so that all hot pressing parts 30 are in a hot pressing state, so as to perform hot pressing on the battery cell unit supported on the lower hot pressing plate 12.

[0072] Specifically, the second drive member 40 includes at least one second cylinder. Preferably, the second drive member 40 includes two second cylinders that are mounted side by side and vertically on the top of the frame 20 to improve the uniformity of force on the hot pressing section 30.

[0073] Specifically, a number of heating elements 50 are provided at intervals on both the upper hot press plate 32 and the lower hot press plate 12, and the corresponding hot press plates are heated by the heating elements 50; preferably, the heating elements 50 are thermocouples.

[0074] Specifically, temperature measuring elements 51 are provided at intervals on both the upper hot press plate 32 and the lower hot press plate 12. The temperature measuring elements 51 are used to detect the temperature of the corresponding hot press plate in real time in order to adjust the heating power of the heating element 50.

[0075] As can be seen, the hot pressing of the battery cell unit supported on the lower hot pressing plate 12 is achieved through the cooperation of the second driving component 40, the upper hot pressing plate 32 and the lower hot pressing plate 12; the bearing surface of the lower hot pressing plate 12 is set as an integral planar structure, which avoids the formation of indentations on the surface of the battery cell unit during hot pressing, and will not affect the appearance of the battery cell unit, thus ensuring the hot pressing effect and hot pressing quality of the battery cell unit.

[0076] Please see Figure 6 As shown, in one embodiment, the upper hot press mechanism 31 also includes an upper isolation film assembly 33, which is configured to fix and lay the upper isolation film 34 on the bottom of the upper hot press plate 32.

[0077] It can be seen that by laying the upper separator 34 between the upper hot press plate 32 and the battery cell unit through the upper separator assembly 33, adhesion between the battery cell unit and the upper hot press plate 12 can be prevented.

[0078] In one implementation, the hot pressing mechanism 31 also includes a detection element 35, which is configured to connect with the electrode base of the battery cell when hot pressing is applied to the battery cell to conduct electricity to detect whether the battery cell is short-circuited.

[0079] It can be seen that by setting the detection component 35, automatic detection of whether the battery cell is short-circuited during hot pressing is realized.

[0080] Please see Figure 1 , Figure 4 and Figure 5 As shown, in one embodiment, the cell hot pressing device includes at least two hot pressing sections 30, which are arranged sequentially on the frame 20 in a vertical direction; the substrate 11 of the lowest hot pressing section 30 is fixed on the frame 20, and the substrates 11 of the remaining hot pressing sections are movably mounted on the frame 20 via sliding guide pairs; the upper hot pressing mechanism 31 of the lower hot pressing section 30 is mounted on the bottom surface of the substrate 11 of the adjacent upper hot pressing section 30.

[0081] It can be seen that by setting at least two hot pressing sections 30, synchronous hot pressing of at least two battery cell units is achieved, thereby improving the hot pressing efficiency. At the same time, by mounting the upper hot pressing mechanism 31 of the lower hot pressing section 30 on the bottom surface of the substrate 11 of the adjacent upper hot pressing section 30, the overall mechanism of the hot pressing device is simplified and the cost is reduced.

[0082] Please see Figure 1 and Figure 3As shown, in one embodiment, the second drive assembly 140 includes a third cylinder 1400 and a mounting base 1401. The mounting base 1401 is fixedly mounted on the base plate 11. The fixed end of the third cylinder 1400 is fixed on the mounting base 1401. The carrier 141 is slidably mounted on the mounting base 1401, which can be close to or away from the frame 20, through a sliding guide pair. The drive end of the third cylinder 1400 is connected to the carrier 141. A plurality of pads 142 are spaced apart on the bearing surface of the carrier 141, and the bearing surfaces of all pads 142 are located on the same horizontal plane.

[0083] Please see Figure 5 As shown, in one embodiment, the battery cell hot pressing device also includes a buffer limiting member 52 that is provided in conjunction with the hot pressing section 30. The buffer limiting member 52 is installed on the base plate 11 of each corresponding hot pressing section 30 and is configured to limit the downward stroke of the upper hot pressing plate 32 of the corresponding hot pressing section 30.

[0084] It can be seen that by setting the buffer limiter 52, the downward stroke limit of the upper hot plate 32 is achieved, avoiding the upper hot plate 32 from falling too far and damaging the battery cell.

[0085] In one embodiment, the battery cell hot pressing device also includes a pressure control member 53 that is matched with the hot pressing part 30. One end of the pressure control member 53 is fixedly mounted on the substrate 11 of the hot pressing part 30, and the other end of the pressure control member 53 abuts against the substrate 11 of the adjacent hot pressing part 30 when the hot pressing part 30 is in the hot pressing state, so as to control the pressing force of the corresponding hot pressing part 30.

[0086] Specifically, pressure control component 53 uses a cylinder.

[0087] It can be seen that by setting a pressure control component 53 on the hot pressing part 30, the clamping force of each hot pressing part 30 can be controlled to ensure the consistency of the clamping force of each hot pressing part 30 and improve the hot pressing quality of the battery cell unit.

[0088] Please see Figures 1 to 5 As shown, the operation flow of the battery cell hot pressing device provided in this application embodiment is as follows:

[0089] Feeding process:

[0090] Taking the loading of a single battery cell as an example, the workflow for loading a single battery cell is as follows:

[0091] S1, the first driving component 130 drives the lower isolation membrane 131 to rise to a preset height;

[0092] S2, the second drive assembly 140 drives the carrier 141 to move between the lower isolation membrane 131 and the lower hot press plate 12, and then the first drive assembly 130 drives the lower isolation membrane 131 to descend so as to lay the lower isolation membrane 131 on the carrier 141.

[0093] S3, the transport mechanism of the previous process picks up the battery cell unit to be hot-pressed by the gripper and transfers the picked-up battery cell unit to be hot-pressed onto the lower isolation membrane 131, and then the transport mechanism withdraws. At this time, the battery cell unit to be hot-pressed is supported by the carrier 141.

[0094] S4, the first drive assembly 130 drives the lower isolation membrane 131 and the battery cell unit to be heated and pressed carried by it to rise to a predetermined height;

[0095] S5, the carrier 141 moves out from between the lower isolation membrane 131 and the lower hot press plate 12;

[0096] S6, the first drive assembly 130 drives the lower isolation membrane 131 to descend until the lower isolation membrane 131 is in close contact with the receiving surface of the lower hot press plate 12.

[0097] Hot pressing process:

[0098] After all the hot pressing sections 30 are loaded, the second driving member 40 drives the upper hot pressing plate 32 of all the hot pressing sections 30 to move closer to the corresponding lower hot pressing plate 12 so as to perform hot pressing on the battery cell unit supported on the lower hot pressing plate 12.

[0099] It should be noted that during the feeding process, the number of grippers of the conveying mechanism can be configured as needed to enable simultaneous feeding of multiple battery cells at one time or feeding of battery cells one by one.

[0100] The cell hot pressing device proposed in this application has the following advantages:

[0101] 1) No indentations will be formed on the surface of the battery cell during hot pressing, ensuring the hot pressing effect and quality of the battery cell.

[0102] 2) Automatic detection of short circuits in battery cells during hot pressing is achieved;

[0103] 3) It can simultaneously hot-press at least two battery cells, improving hot-pressing efficiency;

[0104] 4) The downward stroke limit of the lower hot platen 32 is realized to prevent the upper hot platen 32 from falling too far and damaging the battery cell.

[0105] 5) It can ensure the consistency of the clamping force of each hot pressing part 30, thus improving the hot pressing quality of the battery cell unit.

[0106] The above embodiments merely illustrate the basic principles and characteristics of this application. This application is not limited to the above examples. Various changes and modifications can be made to this application without departing from the spirit and scope thereof, and all such changes and modifications fall within the scope of this application as claimed. The scope of protection of this application is defined by the appended claims and their equivalents.

Claims

1. A cell under-heat pressing mechanism, characterized in that, The cell lower hot-pressing mechanism includes a substrate, a lower hot-pressing plate, a lower insulating film assembly, and an auxiliary support assembly, wherein: The lower hot press plate is mounted on the upper surface of the substrate. The lower hot press plate is configured to support the battery cell unit that is hot-pressed. The supporting surface of the lower hot press plate is an integral planar structure. The lower isolation membrane assembly and the auxiliary support assembly are respectively mounted on the substrate. The lower isolation membrane assembly includes a first driving assembly, a lower isolation membrane, and a fixing assembly. The lower isolation membrane is located above the lower hot press plate and extends in the same direction as the lower hot press plate. The fixing assembly is configured to fix the two sides of the lower isolation membrane. The first driving assembly is configured to drive the fixing assembly to move up and down, so as to drive the lower isolation membrane fixed by the fixing assembly to move up and down. The auxiliary support assembly includes a second drive assembly and a support member. The second drive assembly is configured to drive the support member to move between the lower insulating membrane and the lower hot press plate to support the battery cell unit to be hot-pressed. The second drive assembly is also configured to move the support member out from between the lower insulating membrane and the lower hot press plate to avoid the descent of the lower insulating membrane.

2. The cell under-heat pressing mechanism according to claim 1, characterized in that, The fixing assembly includes a first fixing member and a second fixing member, wherein: The lower hot press plate is mounted on the substrate extending along the first horizontal direction, and the first fixing member and the second fixing member both extend along the first horizontal direction and are respectively disposed on both sides of the lower isolation membrane. The first fastener is configured to fix a first side of the lower isolation membrane, and the second fastener is configured to fix a second side of the lower isolation membrane.

3. The cell under-heat pressing mechanism according to claim 2, characterized in that, The first drive assembly includes two drive units, two fixed seats, and two lifting components, wherein: The two fixing seats are respectively installed on the base plate and located on the outer sides of both ends of the lower hot press plate. The two lifting members are respectively installed on the corresponding fixing seats in a liftable manner. The two ends of the first fixing member and the second fixing member are respectively installed on the two lifting members. Both of the lifting components have a waist-shaped hole extending along the second horizontal direction. Each driving part corresponds to one lifting component. Each driving part includes a first driving component and a transmission cam. The driving end of the first driving component is connected to the transmission cam. The transmission cam is located in the corresponding waist-shaped hole. The first driving component is configured to drive the transmission cam to rotate in the waist-shaped hole, so as to drive the two lifting components to rise and fall. The first horizontal direction is perpendicular to the second horizontal direction.

4. The cell under-heat pressing mechanism according to claim 2, characterized in that, The lower isolation membrane assembly further includes a tension control assembly configured to drive the first fixing member and the second fixing member to move closer to or further away from each other along a second horizontal direction, so as to control the tension of the lower isolation membrane fixed by the first fixing member and the second fixing member.

5. A battery cell hot pressing device, characterized in that, The cell hot pressing device includes a frame, at least one hot pressing section, and a second driving component, wherein: At least one hot pressing section is mounted on the frame, each hot pressing section can be switched to an open state or a hot pressing state, each hot pressing section includes an upper hot pressing mechanism and a cell lower hot pressing mechanism as described in any one of claims 1-4, the upper hot pressing mechanism includes an upper hot pressing plate; The second driving member is configured to drive the upper hot press plates on all the hot press sections to move away from the corresponding lower hot press plates, so that all the hot press sections are in an open state, so as to receive the battery cell units to be hot-pressed by the external handling mechanism through the auxiliary bearing assembly; The second driving member is further configured to drive the upper hot press plate of all the hot press sections to move closer to the corresponding lower hot press plate, so that all the hot press sections are in a hot press state to perform hot press on the battery cell unit supported on the lower hot press plate.

6. The cell hot pressing device according to claim 5, characterized in that, The upper hot pressing mechanism also includes an upper isolation membrane assembly, which is configured to fix and lay the upper isolation membrane on the bottom of the upper hot pressing plate.

7. The cell hot pressing device according to claim 6, characterized in that, The hot-pressing mechanism further includes a detection element configured to contact the tabs of the battery cell unit during hot-pressing to conduct electricity to the battery cell unit and detect whether the battery cell unit is short-circuited.

8. The cell hot pressing device according to claim 6, characterized in that, The cell hot pressing device includes at least two hot pressing sections, wherein: At least two of the hot-pressing sections are sequentially arranged on the frame in a vertical direction; The substrate of the lowest heat-pressing section is fixed on the frame, and the substrates of the remaining heat-pressing sections are movably mounted on the frame via sliding guide pairs; The upper hot pressing mechanism of the lower hot pressing section is mounted on the bottom surface of the substrate of the adjacent upper hot pressing section.

9. The cell hot pressing device according to claim 5, characterized in that, The cell hot pressing device also includes a buffer limiting member that is matched with the hot pressing part. The buffer limiting member is installed on the substrate of each corresponding hot pressing part and is configured to limit the downward stroke of the upper hot pressing plate of the corresponding hot pressing part.

10. The cell hot pressing device according to claim 5, characterized in that, The cell hot pressing device also includes a pressure control component that is matched with the hot pressing part. One end of the pressure control component is fixedly installed on the substrate of the hot pressing part, and the other end of the pressure control component abuts against the substrate of the adjacent hot pressing part when the hot pressing part is in the hot pressing state, so as to control the pressing force of the corresponding hot pressing part.

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