CTP battery in-box clamping force calculation method, apparatus and device, and medium

Abstract

The invention discloses a CTP battery in-box clamping force calculation method, device and equipment and a medium, and relates to the technical field of battery production, the method comprises the following steps: constructing a stress model when a block is clamped and suspended, analyzing to obtain an arc line where stress centers of all battery cells are located, and calculating the length of the arc line where the stress center of a single battery cell is located; analyzing the stress condition of the central battery cell in the stress model, calculating to obtain the transverse theoretical clamping force of the clamping jaw, and calculating to obtain the actual clamping force needing to be provided by the clamping jaw; based on the bearable pressure value of the battery cell and the transverse theoretical clamping force of the clamping jaw, the actual clamping force is increased or decreased through a preset control strategy. According to the invention, the battery cell can be effectively prevented from falling and being clamped and damaged.

Description

Technical Field

[0001] The present application relates to the technical field of battery production, and in particular to a method, device, equipment and medium for calculating the clamping force of a CTP battery entering a box. Background Art

[0002] In recent years, new energy vehicles have developed rapidly. As the core component of new energy vehicles, batteries have become the top priority of self-development by major OEMs. New technologies are constantly emerging. At present, batteries are developing towards CTP (a module-free battery technology). First, a group of cells are stacked into a block (hereinafter referred to as a block), and double-sided films are pasted between the cells. The double-sided films have a certain amount of compression. A group of cells are arranged into a block through the double-sided films. Since there is no fixed structure around these cells, the entire block needs to be clamped by the box-entry clamp to achieve box entry. And when the box-entry operation is performed, since a length for box entry needs to be reserved, when the clamp clamps the block, there is often a length of the lower section of the block without clamping force, and the film in the middle of the cell can be compressed, resulting in the lower section of the cell in a single block presenting a concave arc, and the preload force of the clamp will be attenuated to a certain extent. Therefore, when calculating the clamping force of the clamp, if all the cells are arranged vertically and all clamping calculations are performed, the calculated clamping force result is not accurate.

[0003] At present, the clamping force of the CTP battery block entry jaws is calculated by multiplying the block's deadweight by the safety factor. This calculation method is suitable for battery structures with small compression of the film between the cells. However, most CTPs currently use overfill entry (in a free state, the X-direction size of the block is larger than the size of the box). This entry method first compresses the block to a size smaller than the box size. At this time, the film will have a large deformation. If it is still based solely on the deadweight of the battery cell, the calculated clamping force of the jaws will be too small, which may easily cause the battery cell to fall, thus affecting production safety. Summary of the invention

[0004] The present application provides a method, device, equipment and medium for calculating the clamping force of a CTP battery entering a box, which can effectively prevent the battery cell from falling and being clamped and damaged.

[0005] In a first aspect, an embodiment of the present application provides a method for calculating the clamping force of a CTP battery entering a box, and the method for calculating the clamping force of a CTP battery entering a box includes:

[0006] Construct a force model when the block is clamped and suspended, analyze and obtain the arcs where the force centers of all cells are located, and calculate the length of the arc where the force center of a single cell is located;

[0007] The stress condition of the central cell in the stress model is analyzed, and the theoretical lateral clamping force of the clamp is calculated, and the actual clamping force that the clamp needs to provide is calculated;

[0008] Based on the pressure value that the battery cell can withstand and the theoretical lateral clamping force of the clamp, the increase or decrease of the actual clamping force is achieved through a preset control strategy.

[0009] In combination with the first aspect, in one implementation, the force model of the block when clamped and suspended is constructed, the arcs where the force centers of all the cells are located are analyzed, and the length of the arc where the force center of a single cell is located is calculated, specifically including:

[0010] According to the structure of a single block, a force model is built when the block is clamped and suspended in the air, and the force center of a single battery cell is determined according to the clamping point position of the clamping claw;

[0011] Based on the force center of a single battery cell, the arc where the force centers of all battery cells are located is obtained, and the tangent direction of each point on the arc is the pressure direction of the corresponding battery cell;

[0012] Based on the arcs where the force centers of all battery cells are located, calculate the length of the arc where the force center of a single battery cell is located.

[0013] In combination with the first aspect, in one implementation, the length of the arc where the force center of a single battery cell is located is calculated in a specific manner as follows:

[0014]

[0015] Among them, L hx represents the length of the arc where the force center of the ith battery cell is located, S1 represents the thickness of a single battery cell, S2 represents the thickness of a single film in a free state, 2n+1 represents the total number of batteries in a single block, F1 represents the theoretical clamping force on the left side of the block in the clamping force in the X direction of the gripper, θ i represents the angle between the ith battery cell and the i+1th battery cell, and E represents the elastic modulus of the film.

[0016] In combination with the first aspect, in one implementation, analyzing the stress condition of the central cell in the stress model and calculating the lateral theoretical clamping force of the clamp specifically includes:

[0017] The stress condition of the central cell in the stress model is analyzed. The specific analysis method is as follows:

[0018]

[0019] Where G represents the gravity of a single battery cell;

[0020] According to the calculation method of the arc length where the force center of a single battery cell is located, the analysis method of the force condition of the central battery cell in the force model, and the structural dimensions of the block, the theoretical clamping force F1 on the left side of the block in the X-direction clamping force of the clamp is determined.

[0021] In combination with the first aspect, in one implementation, the calculating of the actual clamping force to be provided by the clamping jaws specifically includes:

[0022] According to the calculation of the horizontal theoretical clamping force of the clamping jaw, the theoretical clamping force on the left side of the block in the clamping force in the X direction of the clamping jaw is obtained, and the set safety factor is used to calculate the actual clamping force that the clamping jaw needs to provide. The specific calculation method is:

[0023] F1·k=F TG

[0024] Among them, F1 represents the theoretical clamping force on the left side of the block in the clamping force in the X direction of the clamping jaw, k represents the safety factor, and F TG Indicates the actual clamping force that the gripper jaws need to provide.

[0025] In combination with the first aspect, in one implementation, the actual clamping force increase and decrease operation is realized through a preset control strategy based on the pressure value that the battery cell can withstand and the theoretical lateral clamping force of the clamping jaws, specifically including:

[0026] When F1·k≥F TG And F TG When <F, the actual clamping force that the clamping jaw needs to provide is increased.

[0027] When F1·k<F TG When the actual clamping force that the clamping jaw needs to provide is calculated, the operation is reduced;

[0028] When F1·k≥F TG And F TG When ≥F, the clamping force warning operation is performed;

[0029] Among them, F1 represents the theoretical clamping force on the left side of the block in the clamping force in the X direction of the clamping jaw, k represents the safety factor, and F TG It indicates the actual clamping force that the jaws need to provide, and F indicates the pressure value that the battery cell can withstand.

[0030] In combination with the first aspect, in one implementation,

[0031] An integrated controller is provided on the clamping jaw;

[0032] The integrated controller is used to control the pressure increase and decrease of the electric cylinder of the clamping jaw, thereby realizing the increase and decrease control of the clamping force of the clamping jaw.

[0033] In a second aspect, an embodiment of the present application provides a CTP battery box clamping force calculation device, the CTP battery box clamping force calculation device comprising:

[0034] The analysis module is used to construct a force model when the block is clamped and suspended, analyze the arcs where the force centers of all cells are located, and calculate the length of the arc where the force center of a single cell is located;

[0035] A calculation module is used to analyze the stress condition of the central cell in the stress model, calculate the theoretical lateral clamping force of the clamp, and calculate the actual clamping force that the clamp needs to provide;

[0036] The execution module is used to increase or decrease the actual clamping force through a preset control strategy based on the pressure value that the battery cell can withstand and the theoretical lateral clamping force of the clamping jaws.

[0037] In a third aspect, an embodiment of the present application provides a CTP battery entry clamping force calculation device, wherein the CTP battery entry clamping force calculation device comprises a processor, a memory, and a CTP battery entry clamping force calculation program stored in the memory and executable by the processor, wherein when the CTP battery entry clamping force calculation program is executed by the processor, the steps of the above-mentioned CTP battery entry clamping force calculation method are implemented.

[0038] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, on which a CTP battery entry clamping force calculation program is stored. When the CTP battery entry clamping force calculation program is executed by a processor, the steps of the above-mentioned CTP battery entry clamping force calculation method are implemented.

[0039] The beneficial effects brought by the technical solution provided in the embodiments of the present application include:

[0040] It can accurately calculate the minimum clamping force required by the clamping jaws for entering the box, calculate the actual clamping force that the clamping jaws need to provide in combination with the safety factor, and can dynamically monitor the clamping force in real time. It can adaptively adjust the clamping force dynamically to prevent the battery cells from falling and being damaged by clamping, etc. At the same time, by accurately calculating the required clamping force in advance, it provides data reference for the design of the clamping tooling, reduces the CTP battery cell entry debugging time, and saves development costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a flow chart of the method for calculating the clamping force of CTP batteries in this application;

[0042] Figure 2 This is a schematic diagram of the structure of the CTP battery block box clamp;

[0043] Figure 3 This is a schematic diagram of the force applied to the CTP battery cell when it is suspended in the air;

[0044] Figure 4 This is a schematic diagram of the functional modules of the CTP battery box clamping force calculation device of this application;

[0045] Figure 5 This is a schematic diagram of the hardware structure of the CTP battery box clamping force calculation device in this application. DETAILED DESCRIPTION

[0046] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0047] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0048] On the first aspect, an embodiment of the present application provides a method for calculating the clamping force of a CTP battery entering a box. According to the actual force conditions of the block and in combination with the compression of the film between the battery cells, a corresponding mechanical model is constructed. By constructing a relationship to calculate the corresponding clamping force of the entry clamp, the clamping force required to be applied by the entry clamp can be quickly calculated, thereby reducing the debugging time of the entry clamp. In addition, by real-time monitoring of the clamping force of the entry clamp, the risk of block falling can be effectively reduced, thereby improving the safety of production operations.

[0049] In one embodiment, referring to Figure 1 , Figure 1 This is a flow chart of the method for calculating the clamping force of CTP batteries in this application. Figure 1 As shown, the calculation method of the clamping force of CTP battery box includes:

[0050] S1: Construct a force model when the block is clamped and suspended, analyze and obtain the arcs where the force centers of all cells are located, and calculate the length of the arc where the force center of a single cell is located;

[0051] For a certain battery, a single block is a combination of multiple cells arranged in a row. There is no corresponding fixed connection structure around it. It is simply connected by double-sided tape between the cells. The block is clamped into the box by the box-entry clamp. Figure 2 The figure shows the structure of the CTP battery block box clamp. Figure 2In the figure, number 1 indicates the clamp in the X direction, which needs to have an interference fit with the box, number 2 indicates the clamp in the Y direction, which has a clearance fit with the box, and number 3 indicates the battery cell. Since the clamp cannot fit the entire battery cell (because a section must be left as a guide for positioning when entering the box), a section of the battery cell is not fitted with the clamp, and the film between the battery cells has a certain amount of compression, which will make the battery cells in a single block present a concave arc, such as Figure 3 As shown, Figure 3 This is a schematic diagram of the force applied to the CTP battery cell when it is suspended in the air. Figure 3 It can be seen that there will be an angle between adjacent battery cells, and by connecting the force centers of each battery cell, an arc will be obtained.

[0052] Furthermore, in one embodiment, a force model is constructed when the block is clamped and suspended, the arcs where the force centers of all the cells are located are analyzed, and the length of the arc where the force center of a single cell is located is calculated, specifically including:

[0053] S101: according to the structure of a single block, a force model is established when the block is clamped and suspended in the air, and the force center of a single battery cell is determined according to the clamping point position of the clamping claw;

[0054] S102: Based on the force center of a single battery cell, an arc line where the force centers of all battery cells are located is obtained, and the tangent direction of each point on the arc line is the pressure direction of the corresponding battery cell;

[0055] S103: Calculate the length of the arc where the force center of each battery cell is located based on the arc where the force center of all battery cells is located.

[0056] Specifically, firstly, according to the structure of a single block, a force model is built when the block is clamped and suspended in the air. At the same time, the force center of a single battery cell (excluding the center of gravity) can be determined according to the clamping point position of the clamp, such as Figure 3 As shown, because the compression of the film between the battery cells is much greater than the compression of the battery cell, the battery cell can be approximately considered as a rigid body. When the block presents a concave arc, the basic size of the battery cell itself does not change. On this basis, the arc where the force center of all battery cells is located is calculated, and the center corresponding to the arc is obtained. The tangent direction of each point on the arc is the direction of the pressure on the battery cell corresponding to the point. Therefore, based on the arc where the force center of all battery cells is located, the length of the arc where the force center of a single battery cell is located can be calculated, that is, the length of the arc corresponding to the force center of a single battery cell.

[0057] In this application, the length of the arc where the force center of a single battery cell is located is calculated in the following specific way:

[0058]

[0059] For the convenience of subsequent description, this formula is recorded as Formula 1. Where, L hx represents the length of the arc where the force center of the ith battery cell is located, S1 represents the thickness of a single battery cell, S2 represents the thickness of a single film in a free state, 2n+1 represents the total number of batteries in a single block. For some blocks, the total number of batteries can also be 2n. F1 represents the theoretical clamping force on the left side of the block in the clamping force in the X direction of the clamp, θ i It represents the angle between the ith cell and the i+1th cell, and E represents the elastic modulus of the film. For the clamping force in the X direction of the clamp, it includes two forces, one on the left side of the block and the other on the right side of the block.

[0060] S2: Analyze the stress condition of the central cell in the stress model, calculate the theoretical lateral clamping force of the clamp, and calculate the actual clamping force that the clamp needs to provide;

[0061] like Figure 3 It can be seen from the force conditions that the force on the middle cell is balanced under tightening, and it is basically in the vertical direction. When the vertical force generated by the friction and pressure on both sides cannot balance the weight of the cell, the middle cell will slide down, and the angle between the friction direction of the middle cell and the outermost cell is the largest, so it is most likely to slide down. Therefore, the force condition of the center cell is analyzed, and it can be obtained:

[0062]

[0063] For the convenience of subsequent description, this formula is recorded as Formula 2. Wherein, G represents the gravity of a single battery cell.

[0064] Furthermore, in one embodiment, the stress condition of the central cell in the stress model is analyzed to calculate the theoretical lateral clamping force of the clamp, which specifically includes:

[0065] S201: Analyze the stress condition of the central cell in the stress model;

[0066] S202: Determine the theoretical clamping force F1 on the left side of the block in the X-direction clamping force of the clamp according to the calculation method of the arc length of the force center of a single battery cell, the analysis method of the force condition of the central battery cell in the force model, and the structural dimensions of the block.

[0067] That is, according to formula 1, formula 2 and the structural dimensions of the block, the arc length of the force center of a single battery cell can be determined. The tangent direction of each point on the arc is the direction of the pressure on the corresponding battery cell, so that the theoretical clamping force F1 on the left side of the block in the X-direction clamping force of the clamp can be calculated. At this time, the minimum clamping force is calculated, and the clamping force that the clamp needs to provide can be obtained by multiplying it by the corresponding safety factor.

[0068] Specifically, the actual clamping force that the clamping jaw needs to provide is calculated, including:

[0069] According to the calculation of the horizontal theoretical clamping force of the clamping jaw, the theoretical clamping force on the left side of the block in the clamping force in the X direction of the clamping jaw is obtained, and the set safety factor is used to calculate the actual clamping force that the clamping jaw needs to provide. The specific calculation method is:

[0070] F1·k=F TG

[0071] Among them, F1 represents the theoretical clamping force on the left side of the block in the clamping force in the X direction of the clamping jaw, k represents the safety factor, and F TG Indicates the actual clamping force that the gripper jaws need to provide.

[0072] S3: Based on the pressure value that the battery cell can withstand and the theoretical lateral clamping force of the clamping jaws, the actual clamping force increase or decrease operation is achieved through a preset control strategy.

[0073] By real-time monitoring of the clamping force F on the clamping jaws TG To give an early warning of the cell falling or to increase the clamping force F by adaptively TG To prevent the battery from falling. Since the pressure that the battery can withstand has a certain limit, when it exceeds the limit, the battery will not only deform but also affect safety. Therefore, an early warning can be issued based on the pressure value that the battery can withstand.

[0074] In this application, based on the pressure value that the battery cell can withstand and the theoretical lateral clamping force of the clamping jaws, the actual clamping force increase and decrease operation is realized through a preset control strategy, which specifically includes:

[0075] When F1·k≥F TG And F TG When <F, the actual clamping force that the clamping jaw needs to provide is increased.

[0076] When F1·k<F TG When the actual clamping force that the clamping jaw needs to provide is calculated, the operation is reduced;

[0077] When F1·k≥F TG And F TG When ≥F, the clamping force warning operation is performed;

[0078] Among them, F1 represents the theoretical clamping force on the left side of the block in the clamping force in the X direction of the clamping jaw, k represents the safety factor, and F TG Indicates the actual clamping force that the clamping jaw needs to provide, and F indicates the pressure value that the battery cell can withstand. The clamping jaw is equipped with an integrated controller; the integrated controller is used to control the pressure increase and decrease of the electric cylinder of the clamping jaw, thereby realizing the increase and decrease control of the clamping force of the clamping jaw.

[0079] This application first calculates the minimum clamping force based on the structural dimensions of the block in the battery, the mechanical properties of the double-sided film between the cells, and the mechanical performance parameters of the cells themselves, and combines the above formulas 1 and 2 to calculate the actual clamping force that the clamp needs to provide, combined with the safety factor. A controller is integrated into the clamp system. When the clamping force is too small, the integrated controller controls the electric cylinder of the clamp to pressurize, and dynamically adjusts the clamping force through the feedback clamping force to prevent the cell from falling; when the clamping force is too large, the pressure of the cell can be adjusted appropriately to prevent the cell from being pinched; when the clamping force exceeds the limit, an alarm is issued to prevent the cell from being pinched and deformed.

[0080] The CTP battery entry clamping force calculation method of the embodiment of the present application can accurately calculate the minimum clamping force required by the entry clamping claws, calculate the actual clamping force that the clamping claws need to provide in combination with the safety factor, and can dynamically monitor the clamping force in real time, and can adaptively adjust the clamping force dynamically to prevent the battery cells from falling and being clamped and damaged, etc. At the same time, by accurately calculating the required clamping force in advance, it provides data reference for the design of the clamping tooling, reduces the CTP battery cell entry debugging time, and saves development costs.

[0081] In a second aspect, an embodiment of the present application also provides a CTP battery box clamping force calculation device.

[0082] In one embodiment, referring to Figure 4 , Figure 4 This is a functional module diagram of the CTP battery box clamping force calculation device of this application. Figure 4 As shown, the CTP battery box clamping force calculation device includes: an analysis module, a calculation module, and an execution module.

[0083] The analysis module is used to construct a force model when the block is clamped and suspended in the air, analyze the arc where the force centers of all battery cells are located, and calculate the length of the arc where the force center of a single battery cell is located; the calculation module is used to analyze the force conditions of the battery cell in the center of the force model, calculate the theoretical lateral clamping force of the clamp, and calculate the actual clamping force that the clamp needs to provide; the execution module is used to increase or decrease the actual clamping force through a preset control strategy based on the pressure value that the battery cell can withstand and the theoretical lateral clamping force of the clamp.

[0084] Among them, the functional implementation of each module in the above-mentioned CTP battery entry clamping force calculation device corresponds to the various steps in the above-mentioned CTP battery entry clamping force calculation method embodiment, and its functions and implementation processes will not be repeated here one by one.

[0085] In a third aspect, an embodiment of the present application provides a CTP battery entry clamping force calculation device, which can be a personal computer (PC), a laptop computer, a server, or other device with data processing capabilities.

[0086] Reference Figure 5 , Figure 5 Schematic diagram of the hardware structure of the CTP battery box clamping force calculation device involved in the embodiment of the present application. In the embodiment of the present application, the CTP battery box clamping force calculation device may include a processor, a memory, a communication interface and a communication bus.

[0087] The communication bus may be of any type and is used to interconnect the processor, the memory, and the communication interface.

[0088] The communication interface includes input / output (I / O) interface, physical interface and logical interface, etc., which are used to realize the interconnection of devices inside the CTP battery box clamping force calculation device, and the interface used to realize the interconnection between the CTP battery box clamping force calculation device and other devices (such as other computing devices or user devices). The physical interface can be an Ethernet interface, a fiber optic interface, an ATM interface, etc.; the user device can be a display (Display), a keyboard (Keyboard), etc.

[0089] The memory can be various types of storage media, such as random access memory (RAM), read-only memory (ROM), non-volatile RAM (NVRAM), flash memory, optical storage, hard disk, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), etc.

[0090] The processor may be a general-purpose processor, which may call the CTP battery entry clamping force calculation program stored in the memory and execute the CTP battery entry clamping force calculation method provided in the embodiment of the present application. For example, the general-purpose processor may be a central processing unit (CPU). The method executed when the CTP battery entry clamping force calculation program is called may refer to the various embodiments of the CTP battery entry clamping force calculation method of the present application, which will not be described in detail here.

[0091] Those skilled in the art will understand that Figure 5The hardware structure shown in the figure does not constitute a limitation on the present application, and may include more or less components than shown in the figure, or combine certain components, or arrange the components differently.

[0092] In a fourth aspect, an embodiment of the present application also provides a computer-readable storage medium.

[0093] The computer-readable storage medium of the present application stores a CTP battery entry clamping force calculation program, wherein when the CTP battery entry clamping force calculation program is executed by a processor, the steps of the CTP battery entry clamping force calculation method as described above are implemented.

[0094] Among them, the method implemented when the CTP battery entry clamping force calculation program is executed can refer to the various embodiments of the CTP battery entry clamping force calculation method of the present application, and will not be repeated here.

[0095] It should be noted that the serial numbers of the above-mentioned embodiments of the present application are only for description and do not represent the advantages or disadvantages of the embodiments.

[0096] The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices. The terms "first", "second" and "third" are used to distinguish different objects, etc., and do not represent a sequence, nor do they limit "first", "second" and "third" to different types.

[0097] In the description of the embodiments of the present application, "exemplary", "for example" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary", "for example" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary", "for example" or "for example" is intended to present related concepts in a specific way.

[0098] In the description of the embodiments of the present application, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; the “and / or” in the text is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, “multiple” refers to two or more than two.

[0099] In some processes described in the embodiments of the present application, multiple operations or steps that appear in a specific order are included, but it should be understood that these operations or steps may not be executed in the order in which they appear in the embodiments of the present application or in parallel, and the sequence number of the operation is only used to distinguish the different operations, and the sequence number itself does not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed in sequence or in parallel, and these operations or steps may be combined.

[0100] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, disk, CD) as described above, and includes a number of instructions for a terminal device to execute the methods described in each embodiment of the present application.

[0101] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A method for calculating the clamping force of a CTP battery into a box, characterized in that: The CTP battery box clamping force calculation method includes: Construct a force model when the block is clamped and suspended, analyze and obtain the arcs where the force centers of all cells are located, and calculate the length of the arc where the force center of a single cell is located; The stress condition of the central cell in the stress model is analyzed, and the theoretical lateral clamping force of the clamp is calculated, and the actual clamping force that the clamp needs to provide is calculated; Based on the pressure value that the battery cell can withstand and the theoretical lateral clamping force of the clamp, the increase or decrease of the actual clamping force is achieved through a preset control strategy.

2. A method for calculating the clamping force of a CTP battery entering a box as claimed in claim 1, characterized in that: The force model of the block when clamped and suspended is constructed, the arcs where the force centers of all the cells are located are analyzed, and the length of the arc where the force center of a single cell is located is calculated, specifically including: According to the structure of a single block, a force model is built when the block is clamped and suspended in the air, and the force center of a single battery cell is determined according to the clamping point position of the clamping claw; Based on the force center of a single battery cell, the arc where the force centers of all battery cells are located is obtained, and the tangent direction of each point on the arc is the pressure direction of the corresponding battery cell; Based on the arcs where the force centers of all battery cells are located, calculate the length of the arc where the force center of a single battery cell is located.

3. A method for calculating the clamping force of a CTP battery entering a box as claimed in claim 2, characterized in that: The specific calculation method for calculating the arc length of the force center of a single battery cell is as follows: Among them, L hx represents the length of the arc where the force center of the ith battery cell is located, S1 represents the thickness of a single battery cell, S2 represents the thickness of a single film in a free state, 2n+1 represents the total number of batteries in a single block, F1 represents the theoretical clamping force on the left side of the block in the clamping force in the X direction of the gripper, θ i represents the angle between the ith battery cell and the i+1th battery cell, and E represents the elastic modulus of the film.

4. A method for calculating the clamping force of a CTP battery entering a box as claimed in claim 3, characterized in that: The force condition of the central cell in the force model is analyzed to calculate the theoretical lateral clamping force of the clamp, which specifically includes: The stress condition of the central cell in the stress model is analyzed. The specific analysis method is as follows: Where G represents the gravity of a single battery cell; According to the calculation method of the arc length where the force center of a single battery cell is located, the analysis method of the force condition of the central battery cell in the force model, and the structural dimensions of the block, the theoretical clamping force F1 on the left side of the block in the X-direction clamping force of the clamp is determined.

5. A method for calculating the clamping force of a CTP battery entering a box as claimed in claim 1, characterized in that: The actual clamping force that the clamping jaw needs to provide is calculated, specifically including: According to the calculation of the horizontal theoretical clamping force of the clamping jaw, the theoretical clamping force on the left side of the block in the clamping force in the X direction of the clamping jaw is obtained, and the set safety factor is used to calculate the actual clamping force that the clamping jaw needs to provide. The specific calculation method is: F1 k=F TG Among them, F1 represents the theoretical clamping force on the left side of the block in the clamping force in the X direction of the clamping jaw, k represents the safety factor, and F TG Indicates the actual clamping force that the gripper jaws need to provide.

6. A method for calculating the clamping force of a CTP battery entering a box as claimed in claim 1, characterized in that: The increase or decrease operation of the actual clamping force is realized by a preset control strategy based on the pressure value that the battery cell can withstand and the theoretical lateral clamping force of the clamping claw, which specifically includes: When F1·k≥F TG And F TG When <F, the actual clamping force that the clamping jaw needs to provide is increased. When F1·k<F TG When the actual clamping force that the clamping jaw needs to provide is calculated, the operation is reduced; When F1·k≥F TG And F TG When ≥F, the clamping force warning operation is performed; Among them, F1 represents the theoretical clamping force on the left side of the block in the clamping force in the X direction of the clamping jaw, k represents the safety factor, and F TG It indicates the actual clamping force that the jaws need to provide, and F indicates the pressure value that the battery cell can withstand.

7. A method for calculating the clamping force of a CTP battery when entering a box as claimed in claim 6, characterized in that: The clamping jaw is provided with an integrated controller; The integrated controller is used to control the pressure increase and decrease of the electric cylinder of the clamping jaw, thereby realizing the increase and decrease control of the clamping force of the clamping jaw.

8. A CTP battery box clamping force calculation device, characterized in that: The CTP battery box clamping force calculation device comprises: The analysis module is used to construct a force model when the block is clamped and suspended, analyze the arcs where the force centers of all cells are located, and calculate the length of the arc where the force center of a single cell is located; A calculation module is used to analyze the stress condition of the central cell in the stress model, calculate the theoretical lateral clamping force of the clamp, and calculate the actual clamping force that the clamp needs to provide; The execution module is used to increase or decrease the actual clamping force through a preset control strategy based on the pressure value that the battery cell can withstand and the theoretical lateral clamping force of the clamping jaws.

9. A CTP battery box clamping force calculation device, characterized in that: The CTP battery entry clamping force calculation device includes a processor, a memory, and a CTP battery entry clamping force calculation program stored in the memory and executable by the processor, wherein when the CTP battery entry clamping force calculation program is executed by the processor, the steps of the CTP battery entry clamping force calculation method as described in any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a CTP battery entry clamping force calculation program, wherein when the CTP battery entry clamping force calculation program is executed by the processor, the steps of the CTP battery entry clamping force calculation method according to any one of claims 1 to 7 are implemented.

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