Battery module anti-instability stacking restraint device and battery module stacking method

Abstract

The application relates to the technical field of battery manufacturing, in particular to a battery module anti-instability stacking restraint device and a battery module stacking method. The device comprises a supporting assembly, a lateral pressure applying member, a driving member and an anti-instability member. The supporting assembly is used for placing and supporting a battery stack assembly. The two sides of the supporting assembly are provided with lateral pressure applying members. One of the lateral pressure applying members is fixed to a target object and remains stationary. The other lateral pressure applying member is used for connecting a first driving device. One end of the driving member is used for connecting a second driving device. The other end of the driving member is connected with the anti-instability member. The anti-instability member is arranged above the battery stack assembly on the supporting assembly. It can be seen that the mechanical hard restraint solves the structural instability problem of the full solid-state module arching upwards during stacking, and avoids physical damage of the assembly caused by arching.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, and in particular to a battery module anti-instability stacking constraint device and a battery module stacking method. Background Technology

[0002] Overexploitation of natural resources has led to the depletion of fossil fuels and the ensuing environmental pollution, making the transition to renewable energy an urgent priority. Compared to widely used liquid lithium batteries, all-solid-state batteries demonstrate significant competitive advantages in engineering applications due to their superior safety and high energy density. The large-scale application of all-solid-state batteries in passenger vehicles can not only effectively alleviate environmental pressure and fossil fuel shortages but also serve as a key pathway to achieving carbon neutrality in the transportation sector. Unlike traditional liquid fuel cells, all-solid-state batteries require high pressure at cell contacts. Under high pressure, factors such as uneven distribution of cell material modulus, low friction coefficient between the cell and the heat insulation pad, and deviations in stack thickness can cause the battery's center of gravity to deviate from its geometric center. During the stacking process where the press applies stacking force to the all-solid-state battery stack, physical instability can easily occur. This instability not only poses risks to assembly operators but also leads to uneven stress on the all-solid-state electrolyte sheets, resulting in brittle fracture. Summary of the Invention

[0003] The purpose of this application is to provide a battery module anti-instability stacking constraint device and a battery module stacking method, which to a certain extent solves the technical problem that physical instability is prone to occur in the process of applying stacking force to the all-solid-state battery stack by the side pressing block of the press. Instability not only poses risks to assembly operators, but also leads to uneven stress on the all-solid-state electrolyte sheet and brittle fracture.

[0004] This application provides a battery module anti-instability stacking constraint device, including: a support component, a lateral pressure member, a driving component, and an anti-instability member; wherein, the support component is used to place and support the battery stack assembly, and the lateral pressure member is provided on both opposite sides of the support component along a first preset direction, and one of the lateral pressure members is fixed to the target object and remains stationary, used to limit one end of the battery stack assembly along the first preset direction, wherein the other lateral pressure member is used to connect to a first driving device, and the first driving device can drive the corresponding lateral pressure member to apply pressure to the battery stack assembly along the first preset direction; One end of the drive member is used to connect to the second drive device, and the other end of the drive member is connected to the anti-instability member. The anti-instability member is disposed above the battery stack assembly on the support assembly. The second drive device can drive the drive member to move the anti-instability member toward the battery stack assembly to apply pressure to the top of the battery stack assembly.

[0005] In the above technical solution, the number of the anti-instability components is multiple, and they are evenly arranged along the second preset direction, and each of the anti-instability components extends along the first preset direction.

[0006] In any of the above technical solutions, the anti-instability component further includes a body and a contact portion connected together; wherein the body is connected to the driving component; along the moving direction of the anti-instability component, the contact portion is disposed at the bottom of the body and is used to apply pressure to the top of the battery stack assembly. In any of the above technical solutions, the contact portion is further detachably connected to the body via a first fastening member.

[0007] In any of the above technical solutions, further, at least a portion of the body is tapered along the body toward the contact portion, and the contact portion is adapted to the small end of the body.

[0008] In any of the above technical solutions, the battery module anti-instability stacking constraint device further includes a base and an anti-instability limiting member; wherein, the anti-instability member is connected to the driving member through the base; along the second preset direction, the anti-instability limiting member is provided on the opposite outer side of the first anti-instability member and the last anti-instability member, and the anti-instability limiting member is fixedly connected to the corresponding base and / or the anti-instability member, and the anti-instability limiting members on both sides are used to abut and limit the battery stack assembly along the second preset direction.

[0009] In any of the above technical solutions, the bottom of the base is further provided with a slot extending through both ends along the first preset direction, and the anti-instability component and the anti-instability limiting component are installed in the corresponding slot.

[0010] In any of the above technical solutions, further, any of the bases is provided with a plurality of the driving components, and the plurality of driving components are arranged sequentially at intervals along the length direction of the anti-instability component.

[0011] In any of the above technical solutions, at least a portion of the base is provided with a plurality of the anti-instability limiting components, and the plurality of anti-instability limiting components are arranged sequentially along the second preset direction.

[0012] In any of the above technical solutions, the support assembly further includes a first support member, a second support member, and a third support member; wherein the first support member, the second support member, and the third support member are connected sequentially from bottom to top along the height direction of the support assembly, and the third support member is used to place the battery stack assembly.

[0013] In any of the above technical solutions, the number of the second support members is multiple, and they are arranged sequentially and evenly at intervals along the second preset direction. Each of the second support members is equipped with a first support member and at least one of the third support members. The second support members and the third support members both extend along the first preset direction. When the second support member is equipped with two third support members, the two third support members are sequentially attached along the second preset direction, and the two ends of the two adjacent third support members are staggered.

[0014] In any of the above technical solutions, the third support member further includes a detachably connected main body and a support portion; wherein the main body is connected to the second support member; along the height direction of the support assembly, the support portion is disposed on the top of the main body and is used to place the battery stack assembly.

[0015] In any of the above technical solutions, further, at least a portion of the main body is tapered along the direction from the main body toward the support portion, and the support portion is adapted to the small end of the main body. In any of the above technical solutions, further, the support assembly includes a support limiting member, and along the second preset direction, the support limiting member is fixed to the opposite outer sides of the first third support member and the last third support member, and the support limiting members on both sides are used to abut and limit the battery stack assembly along the second preset direction.

[0016] In any of the above technical solutions, the end of the first support member away from the second support member is used to connect to the third drive device, and the third drive device is capable of driving the first support member together with the second support member and the third support member to rise and fall. The top of the second support member has a mounting slot extending through both ends along the first preset direction, and the third support member and the support limiting member are installed in the corresponding mounting slot.

[0017] In any of the above technical solutions, the lateral pressing member is tapered along the first preset direction and toward the battery stack assembly.

[0018] In any of the above technical solutions, further, along the first preset direction, each of the two sides of the support component is provided with a plurality of lateral pressure members, and the plurality of lateral pressure members are arranged sequentially and evenly at intervals along the direction of the second preset direction.

[0019] In any of the above technical solutions, the anti-instability component is further made of alloy steel and has an insulating coating on its surface.

[0020] In any of the above technical solutions, the first preset direction is the length direction of the battery stack, and the second preset direction is the width direction of the battery stack.

[0021] In any of the above technical solutions, the battery module anti-instability stacking constraint device further includes a displacement sensor, which is disposed on the driving member and is used to monitor the amount of upward arching deformation of the battery stack assembly in real time.

[0022] This application also provides a battery module stacking method that utilizes the battery module anti-instability stacking constraint device described in any of the above technical solutions. Therefore, it has all the beneficial technical effects of the battery module anti-instability stacking constraint device, which will not be repeated here.

[0023] In the above technical solution, the battery module stacking method further includes the following steps: Step 1: Assemble the battery stack according to the design requirements and stack it in the center of the support assembly, and install end plates at both ends of the battery stack. Step 2: Adjust the second drive device and displacement sensor, set the zero coordinates of the lateral pressure component and the anti-instability component, and check the flexibility of each component. If the displacement sensor feedback data is abnormal, it should be calibrated or the component repaired in time. Step 3: Adjust the anti-instability component to ensure good contact between the lower surface of the anti-instability component and the top of the end plate, and set the initial pre-compression constraint force of the anti-instability component so that its strength is sufficient to support and suppress the instability tendency inside the battery stack. During this process, it is necessary to ensure that the lateral pressure component is aligned with the edge of the end plate. Step 4: Start the first driving device to compress the battery stack using the lateral pressure members on both sides. During this process, the pressure of the anti-instability member needs to be continuously adjusted by the second driving device so that the reverse constraint force provided by the anti-instability member and the stacking force of the lateral pressure member can be dynamically coordinated to forcibly suppress the upward arching of the central area of ​​the battery stack and ensure that the end plate remains in a flat state throughout the entire compression process until the battery stack is compressed to the design height value. Step 5: While maintaining the designed compression height under pressure, install packaging straps on the assembly of the battery stack and the end plate. Then, test the contact stress distribution of the individual cell components inside the battery stack, as well as the interfacial impedance or other electrochemical performance of the cells. If abnormal cell interface contact is detected, the pressure control parameters or dimensions of the anti-instability component need to be changed, and then the process of steps 2, 3 and 4 is repeated. If the test is qualified, the lateral pressure component and the anti-instability component are raised and reset, and the packaging pressure is provided by the straps by binding each component to complete the packaging process of the battery stack.

[0024] Compared with the prior art, the beneficial effects of this application are as follows: (1) The anti-instability component works in conjunction with the lateral pressure component. Through mechanical hard constraint, it can also be combined with the servo drive system for real-time monitoring, which solves the structural instability problem of the center arching upward when the all-solid module is stacked, and avoids physical damage to the components caused by arching. (2) This device is highly versatile. By adjusting the pressure distribution relationship between the lateral main components and the anti-instability components, it can significantly improve the uniformity of the interface pressure inside the all-solid-state battery stack, reduce the pressure gradient, and improve the contact performance of the solid electrolyte. (3) This technology can effectively reduce the requirements for the rigidity of the battery end plate, so that the thickness of the end plate can be further reduced, which is conducive to the lightweight design of the all-solid-state battery stack and improves the battery assembly yield. Attached Figure Description To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of the battery module anti-instability stacking constraint device provided in the embodiments of this application; Figure 2 This is an assembly diagram of the battery module anti-instability stacking constraint device and battery stack assembly provided in the embodiments of this application; Figure 3An assembly drawing of the anti-instability component and the driving component provided in the embodiments of this application; Figure 4 This is another assembly drawing of the anti-instability component and the driving component provided in the embodiments of this application; Figure 5 Another assembly drawing of the anti-instability component and the driving component provided in the embodiments of this application; Figure 6 This is a structural schematic diagram of the lateral pressure application member provided in the embodiments of this application; Figure 7 Another structural schematic diagram of the lateral pressure application member provided in the embodiments of this application; Figure 8 This is a schematic diagram of the structure of the support component provided in the embodiments of this application; Figure 9 This is a schematic diagram of the structure of the battery stack assembly provided in an embodiment of this application.

[0026] Figure label: 1-Support assembly; 11-First support member; 12-Second support member; 13-Third support member; 131-Main body; 132-Support part; 14-Support limiting member; 2-Lateral pressure member; 3-Driving member; 4-Anti-instability member; 41-Body body; 42-Contact part; 43-Mounting hole; 6-Anti-instability limiting member; 7-Base; 8-Battery stack assembly; 81-Battery stack; 82-End plate; a-First preset direction; b-Second preset direction. Detailed Implementation

[0027] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0028] The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application.

[0029] Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application 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. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0032] The following reference Figures 1 to 9 This application describes a battery module anti-instability stacking constraint device and a battery module stacking method according to some embodiments.

[0033] See Figures 1 to 9 As shown, an embodiment of this application provides a battery module anti-instability stacking constraint device, including: a support component 1, a lateral pressure member 2, a driving member 3, and an anti-instability member 4; wherein, the support component 1 is used to place and support the battery stack assembly 8, and lateral pressure members 2 are provided on opposite sides of the support component 1 along a first preset direction a, and one of the lateral pressure members 2 is fixed to the target object and remains stationary, used to limit one end of the battery stack assembly 8 along the first preset direction a, wherein the other lateral pressure member 2 is used to connect to a first driving device, and the first driving device can drive the corresponding lateral pressure member 2 to apply pressure to the battery stack assembly 8 along the first preset direction a; One end of the driving member 3 is used to connect to the second driving device, and the other end of the driving member 3 is connected to the anti-instability member 4. The anti-instability member 4 is disposed above the battery stack assembly 8 on the support assembly 1. The second driving device can drive the driving member 3 to move the anti-instability member 4 toward the battery stack assembly 8 to apply pressure to the top of the battery stack assembly 8.

[0034] As described above, the battery module anti-instability stacking constraint device provided in this application includes a support component 1, a lateral pressure component 2, a driving component 3, and an anti-instability component 4. Based on the principles of mechanical balance and rigid constraint, under the concentrated stacking force transmitted by the lateral pressure component 2 to the end plate 82 of the battery stack 81, the anti-instability component 4 provides a suitable reverse constraint force, effectively suppressing the instability deformation of the all-solid-state battery stack 81 during the stacking process, preventing the central area of ​​the battery from arching upwards, thereby maintaining the overall flatness of the battery stack 81 and ensuring uniform pressure on the internal interface. This constraint device can not only prevent destructive physical instability of the all-solid-state battery stack 81 during the assembly compression stage, but also maintain the compactness of the internal structure of the battery during the installation of the packaging straps, effectively avoiding stacking failure caused by this, thereby significantly improving the assembly accuracy and service reliability of the all-solid-state battery.

[0035] Furthermore, preferably, the first preset direction a is the length direction of the battery stack 81, and the second preset direction b is the width direction of the battery stack 81. Of course, it is not limited to this. For example, the first preset direction a can also be the length direction of the battery stack 81, and the second preset direction b can be the width direction of the battery stack 81, etc., and the specific direction can be selected according to actual needs.

[0036] It should be noted that the battery stack assembly 8 generally includes a battery stack 81 and two end plates 82. The battery stack 81 is formed by stacking multiple battery stacks 81. The two end plates 82 are respectively set at both ends of the battery stack 81 along the first preset direction a. This is a conventional setting and will not be described in detail here. In one embodiment of this application, preferably, as shown below, Figures 1 to 5 As shown, there are multiple anti-instability components 4, which are evenly arranged along the second preset direction b, and each anti-instability component 4 extends along the first preset direction a. As can be seen from the structure described above, designing multiple uniformly arranged anti-instability components 4 ensures that the battery stack 81 is provided with uniformly distributed reverse constraint force, suppresses instability deformation during the stacking and assembly process of the all-solid-state battery stack 81, and has a better effect in preventing the central area of ​​the battery from arching upward.

[0037] Of course, this is not limited to the above. Alternatively, only one anti-instability component 4 can be provided. In this case, it needs to be designed to be large in size and completely cover the battery stack 81, depending on the actual needs. Furthermore, it should be noted that each anti-instability component 4 can also be equipped with only one driving component 3, again depending on the actual needs.

[0038] In one embodiment of this application, preferably, as shown below, Figure 4 and Figure 5As shown, the anti-instability component 4 includes a body 41 and a contact portion 42 connected to each other; wherein, the body 41 is connected to the drive component 3; along the moving direction of the anti-instability component 4, the contact portion 42 is disposed at the bottom of the body 41 and is used to apply pressure to the top of the battery stack assembly 8.

[0039] As can be seen from the structure described above, the main body 41 serves as a transfer and support, while the contact part 42 mainly serves to contact the top of the battery stack 81 and directly provide a reverse constraint force to the battery stack 81. In one embodiment of this application, preferably, as shown below, Figure 4 and Figure 5 As shown, the contact part 42 is detachably connected to the body 41 via a first fastening member, such as a screw or bolt (the first fastening member is not shown in the figure; only the mounting hole 43 for installing the first fastening member is shown). This facilitates installation and disassembly, and in particular, allows for individual maintenance and replacement of the contact part 42 without replacing the entire unit, saving maintenance costs. Of course, this is not the only option; the contact part 42 can also be connected to the body 41 via snap-fit, adhesive, or welding, depending on the specific needs. In one embodiment of this application, preferably, as shown below, Figure 5 As shown, at least a portion of the body 41 tapers towards the contact portion 42, and the contact portion 42 is adapted to the smaller end of the body 41. This ensures the strength of the upper part of the body 41, better serving as a medium for force transmission, while the smaller lower end of the body 41 ensures the required force application, saves material costs, and maintains overall structural stability. Of course, the structure of the body 41 is not limited to the above; the structure of the body 41 can also be of equal thickness at the top and bottom, depending on actual needs.

[0040] In addition, it should be noted that not all of the main body 41 in this application is tapered, but only some of them are tapered, while the other part can be designed according to actual needs. Of course, it is not limited to this. All of the main body 41 can be designed to be tapered, or none of the main body 41 can be designed to be tapered. The specific choice depends on the actual needs.

[0041] In addition, the contact portion 42 can be designed with the same width at the top and bottom, or it can be designed to taper towards the battery stack 81, etc.

[0042] In one embodiment of this application, preferably, as shown below, Figures 3 to 5As shown, the battery module anti-instability stacking constraint device also includes a base 7 and an anti-instability limiting member 6; wherein, the anti-instability member 4 is connected to the driving member 3 through the base 7; along the second preset direction b, the outer sides of the first anti-instability member 4 and the last anti-instability member 4 are provided with anti-instability limiting members 6, and the anti-instability limiting members 6 are fixedly connected to the corresponding base 7 and / or anti-instability member 4 respectively, and the anti-instability limiting members 6 on both sides are used to abut and limit the battery stack assembly 8 along the second preset direction b. As can be seen from the structure described above, the battery stack 81 is limited by the lateral pressure members 2 on both sides along the first preset direction a, such as the length direction. When the anti-instability member 4 presses down on the battery stack 81, the battery stack 81 is limited by the anti-instability limiting members 6 on both sides along the second preset direction b, such as the width direction, to ensure the limiting effect on the battery stack 81 around the perimeter and meet the stacking requirements.

[0043] In addition, the base 7 serves as a transition, connecting the anti-instability component 4 and the driving component 3 together. This facilitates assembly and ensures the stability and robustness of the assembled structure. Furthermore, multiple anti-instability components 4 can be installed on one base 7, and the two bases 7 located at the edge can also be equipped with anti-instability components 4 and anti-instability limiting components 6 for limiting, respectively.

[0044] Of course, the base 7 can be omitted, and the anti-instability component 4 can be directly connected to the driving component 3. For the two anti-instability limiting components 6 at the edge, they can also be directly fixed to the adjacent anti-instability component 4. The specific choice depends on the actual needs.

[0045] In one embodiment of this application, preferably, as shown below, Figure 3 As shown, the bottom of the base 7 has a slot extending through both ends along the first preset direction a. The anti-instability component 4 and the anti-instability limiting component 6 are installed in the corresponding slots, which facilitates installation and disassembly, and is especially convenient for individual disassembly and maintenance. In one embodiment of this application, preferably, as shown below, Figure 1 As shown, any base 7 is equipped with multiple driving components 3, and the multiple driving components 3 are arranged sequentially at intervals along the length direction of the anti-instability component 4 to ensure the stability of the base 7 during the up-and-down movement. Of course, this is not the only one.

[0046] In one embodiment of this application, preferably, as shown below, Figure 3 As shown, at least a portion of the base 7 is equipped with multiple anti-instability limiting components 6, and the multiple anti-instability limiting components 6 are arranged sequentially along the second preset direction b, resulting in better integration. Moreover, the overall strength of a group of anti-instability limiting components 6 will be higher, ensuring the constraint effect on the top of the battery stack assembly 8.

[0047] It should be noted that the top of the battery stack assembly 8 mentioned here refers to its orientation during this assembly process. The top of the battery stack assembly 8 actually refers to the side of the battery stack assembly 8 in its normal state. This is fully understood by those skilled in the art and will not be described in detail here.

[0048] In one embodiment of this application, preferably, as shown below, Figure 8 As shown, the support assembly 1 includes a first support member 11, a second support member 12, and a third support member 13; wherein the first support member 11, the second support member 12, and the third support member 13 are connected sequentially from bottom to top along the height direction of the support assembly 1, and the third support member 13 is used to place the battery stack assembly 8. As can be seen from the structure described above, the first support member 11 serves as a transition and can be used to connect the third drive device, etc. The second support member 12 also serves as a transition, and multiple third support members 13 can be integrated on one second support member 12 to meet different usage requirements. Further, preferably, such as Figure 8 As shown, the top of the second support member 12 has a mounting slot that extends through both ends along the first preset direction a. The third support member 13 and the support limiting member 14 are installed in the corresponding mounting slots, which facilitates installation and disassembly, and is especially convenient for individual disassembly and maintenance. In one embodiment of this application, preferably, as shown below, Figure 8 As shown, there are multiple second support members 12, which are arranged sequentially and evenly at intervals along the second preset direction b, and each second support member 12 is equipped with a first support member 11 and at least one third support member 13; the second support member 12 and the third support member 13 both extend along the first preset direction a. As can be seen from the structure described above, multiple uniform second support members 12 are designed so that multiple third support members 13 can also be evenly distributed, ensuring uniform and stable support for the battery stack 81 and improving the support effect. Of course, it is not limited to this. Only one third support member 13 can be set. In that case, it needs to be designed to be large in size and can completely cover the battery stack 81. The specific selection depends on the actual needs.

[0049] Furthermore, preferably, when the second support member 12 is equipped with two third support members 13, the two third support members 13 are sequentially attached along the second preset direction b, and the two ends of the two adjacent third support members 13 are staggered. This can increase the overall length of each set of third support members 13, increase the support length, meet the support requirements, and ensure the support effect on the battery stack 81 even when the third support member 13 moves. In one embodiment of this application, preferably, as shown below, Figure 8 As shown, the third support member 13 includes a detachably connected main body 131 and a support portion 132; wherein, the main body 131 is connected to the second support member 12; along the height direction of the support assembly 1, the support portion 132 is disposed on the top of the main body 131 and is used to place the battery stack assembly 8. As described above, the main body 131 serves as a connector and support, while the support part 132 primarily contacts the bottom of the battery stack 81, directly providing support. Furthermore, the support part 132 is detachably connected to the main body 131, facilitating installation and disassembly. In particular, the support part 132 can be maintained and replaced individually without replacing the entire unit, saving maintenance costs. Of course, this is not the only option; the support part 132 can also be connected to the main body 131 via snap-fit, adhesive, or welding, depending on the specific needs.

[0050] Furthermore, preferably, at least a portion of the main body 131 is tapered towards the support portion 132, and the support portion 132 is adapted to the smaller end of the main body 131. This ensures the strength of the lower part of the main body 131, better serving as a medium for force transmission, while the upper part of the main body 131 is smaller, ensuring support for the battery stack 81 while saving material costs and maintaining overall structural stability. Of course, the structure of the main body 131 is not limited to the above; the structure of the main body 131 can also be of equal thickness at the top and bottom, depending on actual needs.

[0051] In addition, it should be noted that not all of the main body 131 in this application is tapered, but only some of them are tapered, while the other part can be designed according to actual needs. Of course, it is not limited to this. All of the main body 131 can be designed to be tapered, or none of the main body 131 can be designed to be tapered. The specific choice depends on the actual needs.

[0052] In addition, the support part 132 can be designed with the same width at the top and bottom, or it can be designed to taper towards the battery stack 81, etc.

[0053] In one embodiment of this application, preferably, as shown below, Figure 8 As shown, the support assembly 1 also includes a support limiting member 14, and along the second preset direction b, the outer sides of the first third support member 13 and the last third support member 13 are fixed with support limiting members 14, and the support limiting members 14 on both sides are used to abut and limit the battery stack assembly 8 along the second preset direction b. As can be seen from the structure described above, the battery stack 81 is limited by the lateral pressure members 2 on both sides along the first preset direction a, such as the length direction, and by the support limiting members 14 on both sides along the second preset direction b, such as the width direction, to ensure the support and limiting effect on the battery stack 81 around the perimeter and meet the stacking requirements.

[0054] It should be noted that the bottom of the battery stack assembly 8 is in contact with the upper surface of the third support member 13, the two sides of the battery stack assembly 8 along its width direction are limited by the support limiting member 14, one end of the battery stack assembly 8 along its width direction is limited by the lateral pressure member 2, the other side is pressured by the lateral pressure member 2, and the top is pressured by the anti-instability member 4, thereby achieving all-round positioning and improving assembly accuracy.

[0055] In addition, it should be noted that the structure of support component 1 is not limited to the above, and ordinary working platforms can also be used, depending on actual needs.

[0056] In one embodiment of this application, preferably, as shown below, Figure 8 As shown, the end of the first support member 11 away from the second support member 12 is used to connect to the third drive device, and the third drive device can drive the first support member 11 together with the second support member 12 and the third support member 13 to rise and fall, so as to meet different usage requirements. Of course, it is not limited to this. Alternatively, the third drive device can be omitted, and the first support member 11 can be directly fixed on the target ground or platform. The specific choice depends on the actual needs.

[0057] In one embodiment of this application, preferably, as shown below, Figures 1 to 5 As shown, the battery module anti-instability stacking constraint device also includes a displacement sensor (not shown in the figure). The displacement sensor is set on the driving component 3 and is used to monitor the amount of deformation of the battery stack assembly 8 arching upward in real time, and then adjust the downward pressure depth of the anti-instability component 4 according to the feedback.

[0058] In one embodiment of this application, preferably, as shown below, Figure 6 and Figure 7 As shown, along the first preset direction a and towards the battery stack assembly 8, the lateral pressing member is tapered, resulting in a large rear end dimension and high strength, facilitating assembly with the first driving device and promoting force transmission. The small rear end dimension of the lateral pressing member satisfies the contact area with the end plate 82 while saving material costs and increasing the distance between the front ends of adjacent lateral pressing members. This facilitates the installation of cable ties on the assembly of the battery stack 81 and end plate 82, avoiding interference. Of course, this is not the only limitation; the front and rear ends of the lateral pressing member can also be of equal thickness, depending on actual needs. In one embodiment of this application, preferably, as shown below, Figure 6 and Figure 7 As shown, along the first preset direction a, each of the two sides of the support component 1 is provided with a plurality of lateral pressure members 2, and the plurality of lateral pressure members 2 are arranged sequentially and evenly at intervals along the second preset direction b. As can be seen from the structure described above, multiple uniformly distributed lateral pressure-applying members 2 are provided on each side of the battery stack 81 to ensure the uniformity of the lateral pressure applied to the battery stack 81. Of course, it is not limited to this; only one lateral pressure-applying member 2 may be provided. In that case, it needs to be designed to be large in size and completely cover the end plate 82 of the battery stack 81. The specific choice depends on the actual needs. Of course, the base 7 can be omitted, and the anti-instability component 4 can be directly connected to the driving component 3. The specific choice depends on the actual needs. In one embodiment of this application, preferably, as shown below, Figure 1 As shown, the anti-instability component 4 is made of alloy steel with an insulating coating on its surface. It has high strength, meets usage requirements, and provides insulation, enhancing safety and reliability. Of course, the material of the anti-instability component 4 is not limited to this. The embodiments of this application also provide a battery module stacking method, which utilizes the battery module anti-instability stacking constraint device described in any of the above embodiments. Therefore, it has all the beneficial technical effects of the battery module anti-instability stacking constraint device, which will not be repeated here.

[0059] In one embodiment of this application, preferably, as shown below, Figures 1 to 9 As shown, the battery module stacking method includes the following steps: Step 1: Assemble the battery stack 81 according to the design requirements and stack it in the center of the support component 1, and install end plates 82 at both ends of the battery stack 81 respectively; Step 2: Adjust the second drive device and displacement sensor, set the zero coordinates of the lateral pressure component 2 and the anti-instability component 4, and check the flexibility of each component. If the displacement sensor feedback data is abnormal, it should be calibrated or the component repaired in time. Step 3: Adjust the anti-instability component 4 to ensure that the lower surface of the anti-instability component 4 is in good contact with the top of the end plate 82, and set the initial pre-compression constraint force of the anti-instability component 4 so that its strength is sufficient to support and suppress the instability tendency inside the battery stack 81. During this process, it is necessary to ensure that the lateral pressure component 2 is aligned with the edge of the end plate 82. Step 4: Start the first drive device to compress the battery stack 81 with the lateral pressure members 2 on both sides. During this process, the pressure of the anti-instability member 4 needs to be continuously adjusted by the second drive device so that the reverse constraint force provided by the anti-instability member 4 and the stacking force of the lateral pressure member 2 can be dynamically matched to forcibly suppress the upward arching of the central area of ​​the battery stack 81 and ensure that the end plate 82 remains in a flat state throughout the entire compression process until the battery stack 81 is compressed to the design height value. Step 5: While maintaining the designed compression height under pressure, install packaging straps on the assembly of battery stack 81 and end plate 82. Then, test the contact stress distribution of the single cell components inside battery stack 81, as well as the interface impedance or other electrochemical performance of the cells. If abnormal cell interface contact is detected, the pressure control parameters or dimensions of the anti-instability component 4 need to be changed, and the process of steps 2, 3 and 4 is repeated. If the test is qualified, the lateral pressure component 2 and the anti-instability component 4 are lifted and reset. The packaging pressure is provided by the straps by binding each component, and the packaging process of battery stack 81 is completed. As can be seen from the structure described above, based on the principles of mechanical balance and rigid constraint, under the concentrated stacking force transmitted by the lateral pressure member 2, the anti-instability member 4 provides a suitable reverse constraint force to effectively suppress the instability deformation of the all-solid-state battery stack 81 during the stacking process, prevent the central area of ​​the battery from arching upward, and thus maintain the overall flatness of the battery stack 81 and ensure uniform pressure on the internal interface. This constraint device can not only prevent the all-solid-state battery stack 81 from causing destructive physical instability during the assembly compression stage, but also maintain the compactness of the internal structure of the battery during the installation of the packaging straps, effectively avoiding stacking failure caused by this, thereby significantly improving the assembly accuracy and service reliability of the all-solid-state battery.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery module anti-instability stacking constraint device, characterized in that, include: The device includes a support assembly, a lateral pressure member, a drive member, and an anti-instability member. The support assembly is used to place and support a battery stack assembly. Lateral pressure members are provided on opposite sides of the support assembly along a first preset direction. One of the lateral pressure members is fixed to a target object and remains stationary, used to limit the position of one end of the battery stack assembly along the first preset direction. The other lateral pressure member is connected to a first drive device, and the first drive device can drive the corresponding lateral pressure member to apply pressure to the battery stack assembly along the first preset direction. One end of the drive member is used to connect to the second drive device, and the other end of the drive member is connected to the anti-instability member. The anti-instability member is disposed above the battery stack assembly on the support assembly. The second drive device can drive the drive member to move the anti-instability member toward the battery stack assembly to apply pressure to the top of the battery stack assembly.

2. The battery module anti-instability stacking constraint device according to claim 1, characterized in that, The number of anti-instability components is multiple, and they are evenly arranged along the second preset direction, and each of the anti-instability components extends along the first preset direction.

3. The battery module anti-instability stacking constraint device according to claim 1, characterized in that, The anti-instability component includes a body and a contact portion connected together; wherein the body is connected to the drive component; along the moving direction of the anti-instability component, the contact portion is disposed at the bottom of the body and is used to apply pressure to the top of the battery stack assembly.

4. The battery module anti-instability stacking constraint device according to claim 3, characterized in that, The contact portion is detachably connected to the body via a first fastening member; and / or Along the body toward the contact portion, at least a portion of the body is tapered, and the contact portion is adapted to the small end of the body.

5. The battery module anti-instability stacking constraint device according to claim 1, characterized in that, The battery module anti-instability stacking constraint device further includes a base and an anti-instability limiting component; wherein, the anti-instability component is connected to the driving component through the base; along the second preset direction, the anti-instability limiting component is provided on the opposite outer side of the first anti-instability component and the last anti-instability component, and the anti-instability limiting component is fixedly connected to the corresponding base and / or the anti-instability component, and the anti-instability limiting components on both sides are used to abut and limit the battery stack assembly along the second preset direction; The bottom of the base has a slot extending through both ends along the first preset direction, and the anti-instability component and the anti-instability limiting component are installed in the corresponding slot. Each of the bases is provided with a plurality of the driving components, and the plurality of driving components are arranged sequentially at intervals along the length direction of the anti-instability component; At least a portion of the base is provided with a plurality of the anti-instability limiting components, and the plurality of the anti-instability limiting components are arranged sequentially along the second preset direction.

6. The battery module anti-instability stacking constraint device according to claim 1, characterized in that, The support assembly includes a first support member, a second support member, and a third support member; wherein the first support member, the second support member, and the third support member are connected sequentially from bottom to top along the height direction of the support assembly, and the third support member is used to place the battery stack assembly.

7. The battery module anti-instability stacking constraint device according to claim 6, characterized in that, The number of the second support members is multiple, and they are arranged sequentially and evenly at intervals along a second preset direction. Each of the second support members is equipped with a first support member and at least one of the third support members. Both the second support member and the third support member extend along the first preset direction; When the second support member is equipped with two third support members, the two third support members are sequentially attached along the second preset direction, and the two ends of the two adjacent third support members are staggered. and / or The third support member includes a detachably connected main body and a support portion; wherein the main body is connected to the second support member; along the height direction of the support assembly, the support portion is disposed on the top of the main body and is used to place the battery stack assembly; Along the main body toward the support portion, at least a portion of the main body is tapered, and the support portion is adapted to the small end of the main body; and / or The support assembly further includes support limiting members, and along the second preset direction, the support limiting members are fixed to the opposite outer sides of the first and last third support members, and the support limiting members on both sides are used to abut and limit the battery stack assembly along the second preset direction; and / or The end of the first support member away from the second support member is used to connect to a third drive device, and the third drive device is capable of driving the first support member together with the second support member and the third support member to rise and fall; The top of the second support member has a mounting slot extending through both ends along the first preset direction, and the third support member and the support limiting member are installed in the corresponding mounting slot.

8. The battery module anti-instability stacking constraint device according to claim 1, characterized in that, Along the first preset direction and toward the battery stack assembly, the lateral pressing member is tapered; and / or Along the first preset direction, each of the two sides of the support assembly is provided with a plurality of lateral pressure-applying members, and the plurality of lateral pressure-applying members are arranged sequentially and evenly at intervals along the second preset direction; and / or The anti-instability component is made of alloy steel and has an insulating coating on its surface; and / or The first preset direction is the length direction of the battery stack, and the second preset direction is the width direction of the battery stack.

9. The battery module anti-instability stacking constraint device according to any one of claims 1 to 8, characterized in that, The battery module anti-instability stacking constraint device also includes a displacement sensor, which is disposed on the driving component and is used to monitor the amount of upward arching deformation of the battery stack assembly in real time.

10. A method for stacking battery modules, characterized in that, The battery module stacking method using the battery module anti-instability stacking constraint device according to claim 9 includes the following steps: Step 1: Assemble the battery stack according to the design requirements and stack it in the center of the support assembly, and install end plates at both ends of the battery stack. Step 2: Adjust the second drive device and displacement sensor, set the zero coordinates of the lateral pressure component and the anti-instability component, and check the flexibility of each component. If the displacement sensor feedback data is abnormal, it should be calibrated or the component repaired in time. Step 3: Adjust the anti-instability component to ensure good contact between the lower surface of the anti-instability component and the top of the end plate, and set the initial pre-compression constraint force of the anti-instability component so that its strength is sufficient to support and suppress the instability tendency inside the battery stack. During this process, it is necessary to ensure that the lateral pressure component is aligned with the edge of the end plate. Step 4: Start the first driving device to compress the battery stack using the lateral pressure members on both sides. During this process, the pressure of the anti-instability member needs to be continuously adjusted by the second driving device so that the reverse constraint force provided by the anti-instability member and the stacking force of the lateral pressure member can be dynamically coordinated to forcibly suppress the upward arching of the central area of ​​the battery stack and ensure that the end plate remains in a flat state throughout the entire compression process until the battery stack is compressed to the design height value. Step 5: While maintaining the designed compression height under pressure, install packaging straps on the assembly of the battery stack and the end plate. Then, test the contact stress distribution of the individual cell components inside the battery stack, as well as the interfacial impedance or other electrochemical performance of the cells. If abnormal cell interface contact is detected, the pressure control parameters or dimensions of the anti-instability component need to be changed, and then the process of steps 2, 3 and 4 is repeated. If the test is qualified, the lateral pressure component and the anti-instability component are raised and reset, and the packaging pressure is provided by the straps by binding each component to complete the packaging process of the battery stack.

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