Auxiliary tool and assembling method of all-solid-state battery module

Abstract

The invention provides an auxiliary tool and an assembling method of an all-solid-state battery module, and relates to the technical field of lithium battery production. The auxiliary tool comprises a main body frame, a pressing assembly and a guide assembly. The main body frame is composed of a bottom wall and two positioning pieces arranged at intervals and used for supporting the whole structure. The pressing assembly is arranged between the two positioning pieces and can apply pre-tightening force to the battery modules in the stacking direction. The guide assembly is located in the containing space of the pressing assembly and used for installing the battery cell, guiding the battery cell to move linearly when pre-tightening force is applied, preventing the battery cell from dislocation, warping or lateral extrusion, and ensuring stability and centering performance in the assembling process. On the basis, the auxiliary tool provided by the invention can solve the problem of battery cell offset caused by insufficient constraint in the battery module assembly process, the assembly precision and the pressure uniformity are improved, and the interface contact is improved, so that the electrochemical performance of the battery module is improved, and the service life of the battery module is prolonged.

Description

Technical Field

[0001] This invention relates to the field of lithium battery production technology, and more specifically, to an auxiliary tooling and an assembly method for an all-solid-state battery module. Background Technology

[0002] During charge and discharge, the volume change rate of solid electrolytes is much higher than that of liquid electrolytes, causing the contact interface between the electrodes and the electrolyte to change significantly as the reaction progresses. To ensure that this interface maintains sufficient contact throughout the entire cycle, all-solid-state batteries must be assembled with precisely controlled preload force.

[0003] However, the inventors discovered that when existing auxiliary tooling applies preload, the individual cells or structural components inside the module are prone to relative positional shifts due to insufficient constraint. Such shifts reduce the overall electrochemical performance of the battery module and affect its long-term cycle stability. Summary of the Invention

[0004] The present invention aims to provide an auxiliary tooling and an assembly method for all-solid-state battery modules, which can effectively prevent cell displacement during the assembly process, improve assembly accuracy and pressure uniformity, thereby improving interface contact and significantly improving the electrochemical performance and service life of the battery.

[0005] The embodiments of the present invention can be implemented as follows: In a first aspect, the present invention provides an auxiliary tooling, comprising: The main frame includes a bottom wall and two positioning components, which are spaced apart on the bottom wall. A clamping assembly is disposed between two positioning members and has an accommodating space for placing the battery module, which can apply a pre-tightening force to the battery module along its stacking direction; wherein, the battery module includes two end plates, multiple battery cells and multiple buffer members, and the battery cells and buffer members are alternately stacked between the two end plates along their own thickness direction; A guide assembly, located within the accommodating space, is used to mount the battery cell and guide its linear movement under the preload applied by the clamping assembly.

[0006] In an optional embodiment, the guide assembly includes a guide rod, two positioning seats, and multiple sliding seats; wherein the two positioning seats are spaced apart, the two ends of the guide rod are respectively connected to the two positioning seats, the sliding seats are slidably connected to the guide rod, and each sliding seat is provided with a mounting groove for engaging with the bottom wall of the battery cell.

[0007] In an optional embodiment, each sliding seat is further provided with limiting members at both ends, which are used to abut against the top wall and / or side wall of the battery cell.

[0008] In an optional embodiment, the limiting member includes a first limiting part and a second limiting part; wherein, the first limiting part is connected to the sliding seat and is used to abut against the side wall of the battery cell; the second limiting part is connected to the first limiting part at an angle and is used to abut against the top wall of the battery cell.

[0009] In an optional embodiment, the main frame further includes an adjustable side plate and a drive element; wherein the cylinder seat of the drive element is connected to any positioning member, and its output end is connected to the adjustable side plate; a clamping assembly is disposed between the adjustable side plate and another positioning member.

[0010] In an optional embodiment, the clamping assembly includes a first force-applying element and a second force-applying element, which are arranged facing each other to jointly apply a pre-tightening force along the stacking direction to the battery module.

[0011] In an optional embodiment, the auxiliary tooling further includes two sets of tensile components, which are spaced apart, and each set of tensile components includes at least one tensile rod, with both ends of the tensile rod connected to two positioning members respectively.

[0012] Secondly, the present invention provides an assembly method for an all-solid-state battery module, applied to auxiliary tooling as described in any of the foregoing embodiments, comprising: Multiple battery cells are mounted on the guide assembly; Install buffers so that buffers are provided on both sides of any cell along the stacking direction; Place the two end plates outside the outermost buffer; A preload force along the stacking direction is applied to the two end plates by a clamping assembly; Remove the battery cell from the guide assembly while maintaining the preload force; The end plate, buffer, and battery cell are secured with cable ties.

[0013] In an optional embodiment, the clamping assembly includes a first force-applying element and a second force-applying element, and the first force-applying element and the second force-applying element are arranged facing each other to jointly apply a pre-tightening force along the stacking direction to the battery module. Among them, the first force-applying element and the second force-applying element are both multi-valve core hydraulic cylinders. Each multi-valve core hydraulic cylinder includes n independently controlled valve cores, and the n valve cores are arranged in parallel perpendicular to the stacking direction. The step of applying a preload force along the stacking direction to the two end plates using a clamping assembly specifically includes: By synchronously operating the n valve cores of the first force-applying element and the n valve cores of the second force-applying element, a uniformly distributed preload is applied to the two end plates. The steps of securing the end plate, buffer, and battery cell with cable ties specifically include: From the side of the end plate towards the center, release the holding effect of a single valve core in the first or second force-applying element on the corresponding end plate in sequence. After placing a cable tie in the area between the released valve core and its adjacent valve core, reset the released valve core. Repeat the above steps until the cable ties are installed between adjacent valve cores, so that n One cable tie is placed around the end plate, buffer, and battery cell at intervals along a plane perpendicular to the stacking direction.

[0014] In an optional implementation, determining the preload includes the following steps: Calculate the first equivalent elastic modulus E1 of the end plate, buffer and battery cell, and the second equivalent elastic modulus E2 of the end plate, buffer, cable tie and battery cell; The initial length l1 of the battery module along the stacking direction before the test force F is applied, the compression length l2 after the test force F is applied, and the retention length l3 after the cable tie is completed are measured. Based on the theoretical average pressure σ on the end plate surface and the second force-bearing area A2 of the battery module in the cable tie fixing state, the corresponding theoretical applied pressure value F'=σ×A2 is calculated. Based on the first equivalent elastic modulus E1, the second equivalent elastic modulus E2, the initial length l1, the compression length l2, the holding length l3, the second force-bearing area A2, and the first force-bearing area of ​​the battery module under the action of the clamping component, the compression deformation Δl1=l1-l2, the springback deformation Δl2=l3-l2, and the total effective pre-compression deformation Δl3=l1-l3 are expressed by Hooke's Law as follows: ; ; ; When the relationship Δl3=Δl1-Δl2 is satisfied, it is confirmed that the test force F applied under the current test conditions is the required preload F. 预 And based on this, determine the preload F. 预 for: .

[0015] The beneficial effects of the auxiliary tooling and the assembly method for all-solid-state battery modules provided in this embodiment of the invention include: This invention provides an auxiliary tooling and an assembly method for an all-solid-state battery module. The auxiliary tooling includes a main frame, a clamping assembly, and a guiding assembly. The main frame consists of a bottom wall and two spaced-apart positioning members, used to support the overall structure. The clamping assembly is located between the two positioning members and can apply a pre-tightening force to the battery module along the stacking direction. The guiding assembly is located within the accommodating space of the clamping assembly and is used to install the battery cells. When the pre-tightening force is applied, it guides the linear movement of the battery cells, preventing misalignment, warping, or lateral extrusion, ensuring stability and alignment during the assembly process. Based on the above, the auxiliary tooling provided by this invention can solve the problem of battery cell misalignment caused by insufficient constraints during battery module assembly, improve assembly accuracy and pressure uniformity, improve interface contact, thereby improving the electrochemical performance and service life of the battery module. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the auxiliary tooling and battery module provided in this embodiment; Figure 2 This is a schematic diagram of the structure of the guide assembly and battery module provided in this embodiment; Figure 3 This is a schematic diagram of the sliding seat, limiting member, and battery cell provided in this embodiment; Figure 4 This is a schematic diagram of the multi-valve core hydraulic cylinder acting on the battery module provided in this embodiment; Figure 5 This is a flowchart illustrating steps S1 to S6 of the assembly method provided in this embodiment; Figure 6 This is a structural schematic diagram of the battery module provided in this embodiment during the deformation process.

[0018] Icons: 10-Auxiliary tooling; 30-Battery module; 31-End plate; 32-Battery cell; 33-Buffer component; 100-Main frame; 110-Bottom wall; 130-Positioning component; 150-Adjustable side plate; 170-Drive element; 190-Tension assembly; 191-Tension rod; 300-Pressure assembly; 310-First force-applying element; 320-Valve core; 330-Second force-applying element; 500-Guide assembly; 510-Guide rod; 530-Positioning seat; 550-Sliding seat; 570-Limiting component; 571-First limiting part; 573-Second limiting part. Detailed Implementation

[0019] When existing auxiliary tooling applies pre-tightening force, it is not sufficient to constrain the battery cells, which can easily cause the battery cells or structural components in the module to shift in position, thereby affecting the electrochemical performance and cycle stability of the battery.

[0020] To address the aforementioned issues, this invention provides an auxiliary tooling and an assembly method for all-solid-state battery modules, which can effectively prevent cell misalignment during assembly, improve assembly accuracy and pressure uniformity, thereby improving interface contact and significantly enhancing the electrochemical performance and lifespan of the battery.

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0024] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0025] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0026] It should be noted that, where there is no conflict, the features in the embodiments of the present invention can be combined with each other.

[0027] The following describes in detail the overall structure, working principle, and technical effects of the auxiliary tooling provided by the present invention, as well as the detailed steps, implementation principles, and technical effects of the assembly method for the matching all-solid-state battery module, through embodiments and in conjunction with the accompanying drawings.

[0028] Please see Figures 1 to 3 The present invention provides an auxiliary tooling 10, which can effectively prevent the cell 32 from shifting during the assembly process, improve assembly accuracy and pressure uniformity, thereby improving interface contact and significantly improving the electrochemical performance and service life of the battery module 30.

[0029] It should be noted that the battery module 30 includes two end plates 31, multiple battery cells 32 and multiple buffer components 33 (not shown in the figure). The battery cells 32 and buffer components 33 are alternately stacked between the two end plates 31 along their own thickness direction to form a multi-layer stacked structure.

[0030] The auxiliary tooling 10 includes a main frame 100, a clamping assembly 300, and a guiding assembly 500. The main frame 100 includes a bottom wall 110 and two positioning members 130, which are spaced apart on the bottom wall 110 to support and define the overall structural layout of the tooling.

[0031] The clamping assembly 300 is disposed between the two positioning members 130 and has a receiving space for placing the battery module 30. During assembly, the clamping assembly 300 can apply a preload force to the battery module 30 in the stacking direction.

[0032] The guide assembly 500 is located within the accommodating space and is used to mount the battery cell 32 to guide the battery cell 32 to move linearly when the clamping assembly 300 applies a preload, preventing it from misaligning, warping, or being squeezed out laterally under pressure.

[0033] Based on the above, the auxiliary tooling 10 provided by the present invention can ensure that the buffer 33 and the end plate 31 are subjected to uniform force while applying pre-tightening force, thereby improving the uniformity of stress distribution inside the module. By realizing the precise positioning and linear motion guidance of the cell 32 in the stacking direction, the structural stability of the assembly process is significantly improved, and the relative displacement caused by insufficient constraint is effectively avoided, thereby ensuring the overall electrochemical performance and long-term cycle stability of the battery module 30.

[0034] Please refer to it again. Figure 2 The guide assembly 500 includes a guide rod 510, two positioning seats 530, and multiple sliding seats 550. The two positioning seats 530 are spaced apart, and both ends of the guide rod 510 are connected to the two positioning seats 530 respectively, forming a stable guide frame. The sliding seats 550 are sleeved on the guide rod 510 and slidably connected to it, enabling them to move smoothly in a set direction under preload.

[0035] Based on the above, each sliding seat 550 is provided with a mounting groove (not shown) for engaging with the bottom wall 110 of the battery cell 32, which is used to support and position a single battery cell 32, realizing the pre-installation and precise positioning of the battery cell 32 before stacking. Subsequently, buffer members 33 are inserted on both sides of each battery cell 32 along the stacking direction, and an end plate 31 is placed outside the outermost buffer member 33, thereby completing the overall assembly and structural positioning of the battery module 30 on the auxiliary tooling 10.

[0036] Furthermore, in the direction perpendicular to the stacking direction, each sliding seat 550 is provided with a limiting member 570 at both ends. The limiting member 570 is used to abut against the top wall and / or side wall of the battery cell 32, which can further limit the battery cell 32 in the width and thickness directions, effectively preventing the battery cell 32 from vertically shifting, laterally shifting or rotating and other unstable phenomena during the pressing process, thereby significantly improving the positioning accuracy and structural stability during the assembly process.

[0037] Specifically, such as Figure 3 As shown, in an embodiment that achieves coordinated limiting of the battery cell 32 in both the width and height directions, the limiting member 570 includes a first limiting portion 571 and a second limiting portion 573. The first limiting portion 571 is connected to the sliding seat 550 and abuts against the side wall of the battery cell 32; the second limiting portion 573 is connected to the first limiting portion 571 at an angle and abuts against the top wall of the battery cell 32.

[0038] Optionally, the first limiting part 571 and the second limiting part 573 are vertically connected to form an "L"-shaped structure to enhance the stability and spatial adaptability of the limiting.

[0039] In one embodiment, the clamping assembly 300 includes a first force-applying element 310 and a second force-applying element 330, which are arranged facing each other and located on both sides of the battery module 30, respectively, to jointly apply a pre-tightening force along the stacking direction to the battery module 30. It is understood that the space between the first force-applying element 310 and the second force-applying element 330 is the accommodating space for placing the battery module 30.

[0040] Based on the above, the symmetrical force application structure can apply load synchronously from both ends, effectively ensuring that the pressure is evenly transmitted at both ends of the module, avoiding tilting, bias, or local stress concentration caused by unilateral loading, thereby improving the consistency of pressure distribution and alignment accuracy during assembly.

[0041] In this state, after the preload is stably applied, the battery cell 32 can be removed from the sliding seat 550, while the clamping assembly 300 continues to apply force to ensure that each layer of the module structure (including the end plate 31, buffer 33, and battery cell 32) remains compressed without rebound. Subsequently, cable ties are applied and tightened to finally complete the mechanical fixation of the entire battery module 30.

[0042] Through the above operations, reliable installation of cable ties can be achieved under high preload conditions, effectively locking the stack size and ensuring that the battery module 30 maintains stable interface contact pressure during subsequent use, thereby improving its electrochemical performance and long-term cycle reliability.

[0043] Optionally, both the first force-applying element 310 and the second force-applying element 330 are multi-valve-core 320 hydraulic cylinders. Each multi-valve-core 320 hydraulic cylinder includes n independently controlled valve cores 320, and the n valve cores 320 are arranged side by side perpendicular to the stacking direction. Thus, the pressure of some valve cores 320 is released region by region from the side of the module towards the center, and cable ties are placed between adjacent regions and tightened.

[0044] Please see Figure 4 In this embodiment, the multi-valve-core 320 hydraulic cylinder is equipped with five valve cores 320 arranged side by side in a vertical direction, which are referred to as the first valve core 320, the second valve core 320, the third valve core 320, the fourth valve core 320, and the fifth valve core 320 from bottom to top. While maintaining the overall pre-tightening force of the battery module 30 without interruption, multiple cable ties are intermittently sleeved using a step-by-step local pressure release method.

[0045] Specifically, firstly, the pressure on the end plate 31 of the first valve core 320 is released, creating an operating gap between the first valve core 320 and the upper second valve core 320. The first cable tie is then inserted into this gap. Subsequently, the pressure on the first valve core 320 is restored, causing it to reapply pre-tightening force. Next, the pressure on the second valve core 320 is released, and using the gap between it and the third valve core 320, the first cable tie is pushed inward, moving it between the second and third valve cores 320, and tightening and fixing it, thus achieving the binding of the first cable tie.

[0046] Following the same method, cable ties are installed in other areas: a second cable tie is installed between the third and fourth valve cores 320, a third cable tie is installed between the second and first valve cores 320, and a fourth cable tie is installed between the fifth and fourth valve cores 320. By controlling the start and stop of each valve core 320 in sequence, local pressure relief and rapid reset are achieved, avoiding module springback or interlayer misalignment caused by overall pressure relief.

[0047] Understandably, the method involves applying pre-tightening force while gradually installing the cable ties from the center outwards, ensuring that each cable tie is tightened under controlled pressure. This guarantees the stability of the stacked dimensions of the battery module 30, the consistency of the compression of the buffer 33, and the reliability of the interface contact, effectively improving the assembly accuracy and long-term performance of the all-solid-state battery module 30.

[0048] In another embodiment, the pressing assembly 300 may also have only one force-applying element, which is located on one side of the battery module 30, and the other side of the module is supported by a fixed positioning member 130 or a rigid support structure to provide reaction force support, thereby achieving unilateral pressure.

[0049] To accommodate battery modules 30 of different sizes, the main frame 100 also includes an adjustable side plate 150 and a drive element 170; wherein, the cylinder seat of the drive element 170 is connected to any positioning member 130, and its output end is connected to the adjustable side plate 150, for driving the adjustable side plate 150 to move along the stacking direction of the battery cells 32, thereby adjusting the distance between it and another fixed positioning member 130.

[0050] Accordingly, the clamping assembly 300 is disposed between the adjustable side plate 150 and another positioning member 130, and can adapt to battery modules 30 of different lengths or thicknesses as the distance between the two is adjusted. Specifically, in an embodiment where the clamping assembly 300 includes a first force-applying element 310 and a second force-applying element 330, the first force-applying element 310 is mounted on the adjustable side plate 150, moves synchronously with it, and acts on one end of the battery module 30; the second force-applying element 330 is mounted on the positioning member 130 where the adjustable side plate 150 is not provided, is relatively fixed, and acts on the other end of the module. During the application of pre-tightening force, the two force-applying elements work against each other to ensure that the pressure is evenly transmitted to the entire module.

[0051] Furthermore, to effectively enhance the overall structural rigidity of the main frame 100 and resist the reaction force generated by the clamping assembly 300 when the preload is applied, the auxiliary tooling 10 also includes two sets of tensile components 190. The two sets of tensile components 190 are spaced apart along a direction perpendicular to the stacking direction of the battery modules 30, and each set of tensile components 190 includes at least one tensile rod 191. The two ends of the tensile rod 191 are respectively connected to two positioning members 130, thereby forming a stable tensile load-bearing structure. Optionally, each set of tensile components 190 includes three tensile rods 191, spaced apart along the vertical direction.

[0052] In summary, this invention provides an auxiliary tooling 10, which includes a main frame 100, a clamping assembly 300, and a guiding assembly 500. The main frame 100 consists of a bottom wall 110 and two spaced-apart positioning members 130, used to support the overall structure. The clamping assembly 300 is located between the two positioning members 130 and can apply a pre-tightening force along the stacking direction to the battery module 30. The guiding assembly 500 is located within the accommodating space of the clamping assembly 300 and is used to install the battery cell 32. When the pre-tightening force is applied, it guides the battery cell 32 to move linearly, preventing misalignment, warping, or lateral extrusion, and ensuring stability and alignment during assembly. Based on the above, the auxiliary tooling 10 provided by this invention can solve the problem of battery cell 32 misalignment caused by insufficient constraint during the assembly of the battery module 30, improve assembly accuracy and pressure uniformity, improve interface contact, thereby improving the electrochemical performance and service life of the battery module 30.

[0053] Please see Figure 5 This invention provides an assembly method for an all-solid-state battery module 30, which is based on the auxiliary tooling 10 provided in any of the foregoing embodiments, and specifically includes the following steps: Step S1: Install multiple battery cells 32 onto the guide assembly 500.

[0054] In this step, individual battery cells 32 are carried and positioned one by one by multiple sliding seats 550 and their mounting slots in the guide assembly 500. The bottom wall 110 of each battery cell 32 is embedded in the mounting slot of the corresponding sliding seat 550, achieving initial alignment and support along the stacking direction.

[0055] S2. Install buffer 33 so that buffer 33 is provided on both sides of any cell 32 along the stacking direction.

[0056] In this step, the buffer 33 is typically made of an elastic material (such as silicone, foam or polymer pad) to absorb the stress caused by volume changes during charging and discharging, and to ensure that the preload is evenly transmitted to each layer of the structure.

[0057] S3. Place the two end plates 31 outside the outermost buffer 33 respectively.

[0058] In this step, the end plate 31, as the external load-bearing structure of the module, is typically made of metal or high-strength composite material, possessing good rigidity and bending resistance. It is placed on top of the outermost buffer 33 to form a complete laminated structure, providing a reliable load-bearing surface for subsequent application of preload.

[0059] S4. Apply a preload force along the stacking direction to the two end plates 31 by means of the clamping assembly 300.

[0060] In this step, the first force-applying element 310 and the second force-applying element 330 in the clamping assembly 300 move in opposite directions to simultaneously apply a controllable preload to the two end plates 31, so that the battery module 30 is in a compressed state as a whole.

[0061] S5. While maintaining the preload, remove the battery cell 32 from the guide assembly 500.

[0062] In this step, once the preload is stably applied and the module's compression deformation reaches the set value, the connection between the battery cell 32 and the sliding seat 550 is released, causing it to disengage from the mounting slot, but it remains tightly clamped in a compressed state by the end plate 31 and the buffer 33. This process is completed under the continuous action of the clamping assembly 300, ensuring that the module has no springback or loosening.

[0063] S6. Secure the end plate 31, buffer 33, and battery cell 32 with cable ties.

[0064] In this step, flexible cable ties (such as nylon cable ties, metal straps, or pre-tightened straps) are used to wrap around the perimeter of the module, tightening and locking it while maintaining the current compressed length, thereby mechanically locking the end plate 31, buffer 33, and battery cell 32 as a whole.

[0065] Because of the auxiliary tooling 10 used in the aforementioned embodiments, this assembly method can also solve the problem of cell 32 offset caused by insufficient constraints during the assembly of battery module 30, improve assembly accuracy and pressure uniformity, improve interface contact, and thus improve the electrochemical performance and service life of battery module 30.

[0066] Furthermore, in the aforementioned embodiments, the clamping assembly 300 includes a first force-applying element 310 and a second force-applying element 330, which are arranged facing each other to jointly apply a pre-tightening force along the stacking direction to the battery module 30. Moreover, both the first force-applying element 310 and the second force-applying element 330 are multi-valve-core 320 hydraulic cylinders, each including n independently controlled valve cores 320, and the n valve cores 320 are arranged side-by-side perpendicular to the stacking direction.

[0067] Based on this, the step of applying a preload force along the stacking direction to the two end plates 31 by the clamping assembly 300 (i.e., step S4) specifically includes: By synchronously operating the n valve cores 320 of the first force-applying element 310 and the n valve cores 320 of the second force-applying element 330, a uniformly distributed preload is applied to the two end plates 31.

[0068] In this step, all valve cores 320 extend synchronously and contact the surface of end plate 31, applying pressure at multiple discrete locations simultaneously, so that the pressure field tends to be uniform across the entire plane of end plate 31.

[0069] Accordingly, the step of securing the end plate 31, the buffer 33, and the battery cell 32 with cable ties (i.e., step S6) specifically includes: S61. From the side of the end plate 31 towards the center, release the holding effect of a single valve core 320 in the first force-applying element 310 or the second force-applying element 330 on the corresponding end plate 31 in sequence. After a cable tie is placed in the area between the released valve core 320 and its adjacent valve core 320, reset the released valve core 320.

[0070] In this embodiment, firstly, a valve core 320 located in the edge region of the module (e.g.) is selected. Figure 4 The first valve core 320 at the bottom (shown in the diagram) is controlled to retract, temporarily relieving the pressure on the end plate 31 in this area, thereby creating an operating gap between it and the adjacent valve core 320 above it, allowing a cable tie to be inserted. At this time, the remaining valve cores 320 remain under pressure, ensuring that the compression of the module body remains essentially unchanged. A flexible cable tie is then inserted into this gap from the outside and wrapped around the module once, initially tightened, and then locked. Immediately afterwards, the extended state of the valve core 320 is restored, re-establishing pressure support for this area, completing one local binding cycle.

[0071] S63. Repeat the above operation until the cable ties are installed between each adjacent valve core 320, so that n A cable tie is placed around the end plate 31, the buffer 33 and the battery cell 32 at intervals along a plane perpendicular to the stacking direction.

[0072] In this step, the above operation S61 is repeated. The valve cores 320 at different positions are briefly released and reset sequentially, either from the side towards the center or in an alternating manner. The cable ties are then laid and locked between each pair of adjacent valve cores 320. Through this method, n is ultimately formed. A series of cable ties spaced at intervals along the height direction are evenly wrapped around the outer perimeter of the module to achieve overall mechanical fixation of the end plate 31, buffer 33 and battery cell 32.

[0073] The specific cable tie installation process can be referred to in the aforementioned embodiment with 5 valve cores 320, whose operation sequence is clear and control is reliable, and will not be repeated here. It should be noted that in other embodiments, the number of valve cores 320 in the multi-valve core 320 hydraulic cylinder is not limited to 5, and can also be adapted to 3, 4 or 6, etc., depending on the height or pressure distribution requirements of the battery module 30.

[0074] Those skilled in the art can reasonably select the number of valve cores 320 according to the actual application scenario to balance control complexity and process precision, all of which fall within the protection scope of this invention.

[0075] Furthermore, combined Figure 6It is understood that in the assembly method of the all-solid-state battery module 30 of the present invention, the determination of the preload includes the following steps: Calculate the first equivalent elastic modulus E1 of the end plate 31, buffer 33 and battery cell 32, and the second equivalent elastic modulus E2 of the end plate 31, buffer 33, cable tie and battery cell 32.

[0076] In this step, the end plate 31 is assumed to be a rigid body, and its deformation during the stress process is ignored. Simultaneously, the battery cell 32, buffer 33, and cable tie are all considered as linear elastic materials, and the local deformation of the cable tie along the preload direction in the contact area with the end plate 31 is ignored. For a stress-bearing structure formed by the combination of the end plate 31, buffer 33, and battery cell 32, or a stress-bearing structure formed by the combination of the end plate 31, buffer 33, cable tie, and battery cell 32, its overall equivalent elastic modulus E can be calculated using the following formula: .

[0077] In the formula, V i E represents the proportion (volume fraction) of the volume of the i-th component to the total volume. i This is the elastic modulus of the component material.

[0078] The initial length l1 of the battery module 30 along the stacking direction before the test force F is applied, the compression length l2 after the test force F is applied, and the retention length l3 after the cable tie is completed are measured.

[0079] Based on the theoretical average pressure σ on the surface of end plate 31 and the second force-bearing area A2 of battery module 30 in the cable tie fixing state, the corresponding theoretical applied pressure value F'=σ×A2 is calculated.

[0080] Based on the first equivalent elastic modulus E1, the second equivalent elastic modulus E2, the initial length l1, the compression length l2, the holding length l3, the second force-bearing area A2, and the first force-bearing area of ​​the battery module 30 under the action of the clamping assembly 300, the compression deformation Δl1=l1-l2, the springback deformation Δl2=l3-l2, and the total effective pre-compression deformation Δl3=l1-l3 are expressed by Hooke's Law as follows: ; ; ; When the relationship Δl3=Δl1-Δl2 is satisfied, it is confirmed that the test force F applied under the current test conditions is the required preload F. 预 And based on this, determine the preload F. 预 for: .

[0081] It should be noted that the expression for Huke's Law is: .

[0082] In the formula, ΔL is the elastic deformation of the material under axial force (elongation is positive, shortening is negative), F is the applied axial force (tension is positive, compression is negative), L0 is the original length of the material, E is the elastic modulus of the material, and A is the cross-sectional area of ​​the stressed section.

[0083] Substituting the above parameters into Hooke's Law, when the relationship Δl3=Δl1-Δl2 is satisfied, and combining the expressions for compression deformation Δl1=l1-l2, springback deformation Δl2=l3-l2, and total effective pre-compression deformation Δl3=l1-l3, the required preload F can be calculated by solving the simultaneous equations. 预 .

[0084] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. An auxiliary tool characterized in that, The utility model relates to a kind of auxiliary tool for battery module, including: Main body frame, the main body frame includes bottom wall and two positioning parts, and two the positioning part is spaced apart on the bottom wall; Compression assembly, the compression assembly is located between two the positioning part, and it has the accommodation space for placing battery module, can exert pre-tightening force along the stack direction of the battery module to the battery module;Wherein, the battery module includes two end plates, multiple electric cores and multiple buffer pieces, the electric core and the buffer piece are alternately stacked along the thickness direction of itself between two the end plate; Guiding assembly, the guiding assembly is located in the accommodation space, for installing the electric core, to guide the linear movement of the electric core under the condition that the compression assembly exerts pre-tightening force.

2. The auxiliary tooling of claim 1, wherein, The guiding assembly includes guide rod, two positioning seats and multiple sliding seats;Wherein, two the positioning seat is spaced apart, and the both ends of the guide rod are respectively connected with two the positioning seat, and the sliding seat is slidably connected with the guide rod, and each sliding seat is equipped with installation slot for cooperating with the bottom wall of the electric core.

3. The auxiliary tooling of claim 2, wherein, The both ends of each sliding seat are also equipped with limiting part, and the limiting part is used for abutting with the top wall and / or side wall of the electric core.

4. The auxiliary tooling of claim 3, wherein, The limiting part includes first limiting part and second limiting part;Wherein, the first limiting part is connected with the sliding seat, for abutting with the side wall of the electric core;The second limiting part is connected at an angle with the first limiting part, for abutting with the top wall of the electric core.

5. The auxiliary tool of claim 1, wherein The main body frame also includes distance adjusting side plate and driving element;Wherein, the cylinder seat of the driving element is connected with any the positioning part, and the output end thereof is connected with the distance adjusting side plate;The compression assembly is located between the distance adjusting side plate and another the positioning part.

6. The auxiliary tool of claim 1, wherein The compression assembly includes first force applying element and second force applying element, and the first force applying element and the second force applying element are oppositely arranged, for jointly exerting pre-tightening force along the stack direction to the battery module.

7. The auxiliary tooling of any one of claims 1 to 6, wherein, The auxiliary tool also includes two groups of anti-tension assemblies, and two the anti-tension assembly is spaced apart, and each the anti-tension assembly includes at least one anti-tension rod, and the both ends of the anti-tension rod are respectively connected with first positioning part and second positioning part.

8. A method of assembling an all-solid-state battery module, applied to the auxiliary tool according to any one of claims 1 to 7, characterized by, Including: Install multiple the electric core on the guiding assembly; Install the buffer piece, so that any the electric core is equipped with the buffer piece on both sides along the stack direction; Place two the end plate outside the outermost buffer piece respectively; Exert pre-tightening force along the stack direction to two the end plate by the compression assembly; In the state of maintaining pre-tightening force, remove the electric core from the guiding assembly; Fix the end plate, the buffer piece and the electric core by cable tie.

9. The method of assembling according to claim 8, wherein, The compression assembly includes first force applying element and second force applying element, and the first force applying element and the second force applying element are oppositely arranged, for jointly exerting pre-tightening force along the stack direction to the battery module; Wherein, the first force applying element and the second force applying element are all multi-valve core hydraulic cylinders, each the multi-valve core hydraulic cylinder includes n independently controlled valve core, and n the valve core is arranged in parallel perpendicularly to the stack direction; The step of applying the pre-tightening force to the two end plates in the stacking direction by the compression assembly specifically comprises: The n valve cores of the first force applying element and the n valve cores of the second force applying element are synchronously actuated to apply the pre-tightening force uniformly distributed to the two end plates; The step of fixing the end plates, the buffer and the battery cell by the cable tie specifically comprises: The single valve core in the first force applying element or the second force applying element is sequentially removed from the side of the end plate to the center direction, and the removed valve core is reset after the cable tie is sleeved between the removed valve core and its adjacent valve core; The above operations are repeatedly performed until the strap installation is completed between each adjacent valve core, so that n 1The strap is spaced around the end plate, the buffer and the electric core along a plane perpendicular to the stacking direction.

10. The method of assembling of claim 8, wherein, The determination of the pre-tightening force comprises the following steps: The first equivalent elastic modulus E1 of the end plate, the buffer and the battery cell, and the second equivalent elastic modulus E2 of the end plate, the buffer, the cable tie and the battery cell are calculated; The initial length l1 of the battery module in the stacking direction before the test force F is applied, the compressed length l2 after the test force F is applied, and the retained length l3 after the cable tie is tied are measured; According to the theoretical average pressure σ on the surface of the end plate and the second stress area A2 of the battery module in the cable tie fixing state, the corresponding theoretical applied pressure value F' = σ × A2 is calculated; According to the first equivalent elastic modulus E1, the second equivalent elastic modulus E2, the initial length l1, the compressed length l2, the retained length l3, the second stress area A2 and the first stress area of the battery module under the action of the compression assembly, the compression deformation Δl1 = l1-l2, the rebound deformation Δl2 = l3-l2 and the total effective pre-compression deformation Δl3 = l1-l3 are respectively represented by Hooke's law. ； ； ； When the relational expression Δl3=Δl1-Δl2 is satisfied, it is confirmed that the test force F applied under the current test condition is the desired pre-tightening force F 预 , and the pre-tightening force F is determined accordingly 预 is: 。

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