A battery module welding gap detection device
By designing a battery module welding gap detection device including a pressure head, a wind speed sensor and a computer, the problem of long and low efficiency of metallographic experimental detection in the prior art is solved, fast and accurate gap detection is achieved, and welding quality and battery performance are improved.
Patent Information
- Application Number
- CN202421578693.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-04
- Publication Date
- 2025-04-01
- Estimated Expiration
- 2034-07-04
AI Technical Summary
In the prior art, the metallographic experiments are used to detect that the welding gap time of lithium battery modules is long, the efficiency is low, and there are problems that cannot be detected, which affects the welding quality and battery performance.
A battery module welding gap detection device is designed, including a pressure head, a wind speed sensor and a computer. The gap between the pole plate and the pole column is detected by the negative pressure equipment, and the wind speed sensor is used to monitor and calculate the gap size in real time to achieve fast and accurate detection.
The device can quickly and accurately detect the welding gap between lithium battery modules, improve detection efficiency, reduce the probability of poor welding, and has the advantages of high efficiency, real-time and low cost.
Smart Images
Figure CN222704044U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of lithium batteries, in particular to a battery module. Background Art
[0002] At present, one of the main factors affecting the welding quality of battery modules is the gap between the pole piece and the battery cell pole. The gap between the pole piece and the battery cell pole refers to the space gap between the battery cell pole and the pole piece due to height difference or other reasons during the manufacturing process of lithium batteries. The existence of this gap may lead to poor welding and reduce the performance and safety of the battery. Too large a gap will directly affect the penetration of the weld (penetration refers to the depth of a part of the parent material or the previous weld that is melted by the welding heat source during the welding process. This depth is the distance from the surface of the parent material to the deepest part of the melted metal. On the cross section of the welded joint, the penetration determines the bonding strength between the weld and the parent material, thereby affecting the overall load-bearing capacity of the weld). Pole pieces and battery cell poles are usually welded by laser. Laser welding is a high-energy-density welding technology that melts the material by local heating and then cools and solidifies to form a weld. Therefore, when laser welding, the gap will also be counted when calculating the penetration. If the gap is too large, the actual penetration will become smaller, affecting the welding, resulting in defects such as cold welding. The gap between the workpieces directly affects the penetration depth of the welded workpieces.
[0003] The detection of penetration depth usually involves steps such as sampling, cutting, sample preparation and corrosion. The specific value of the penetration depth can be obtained by measuring and analyzing the metal sample of the cross section of the weld joint. Traditional fitting gap detection is mainly determined by tools such as metallographic experiments, polishing machines and corrosion solutions. However, metallographic experiments take several hours each time, which directly affects the efficiency of the production line. Because the metallographic experiment is too long, the frequency of metallographic experiments becomes lower, generally once a shift, and more strictly 4 hours / time. If there is a poor fitting gap during this period, it will not be detected, which will inevitably increase the probability of poor module welding.
[0004] Knowing the size of the gap is helpful for knowing the value of the penetration depth and judging whether it is a qualified product. On the other hand, for defective products, the size of the gap can be used to optimize the subsequent welding process. Therefore, how to quickly know the gap is an important problem that needs to be solved.
[0005] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art known to those skilled in the art. Utility Model Content
[0006] The technical problem to be solved by the utility model is: how to solve the problem that the current metallographic test is used to detect the bonding gap, which takes a long time, has low detection efficiency, and cannot be detected.
[0007] The utility model solves the above technical problems through the following technical means:
[0008] A battery module welding gap detection device, comprising a pressure head, a wind speed sensor, and a computer;
[0009] The pressure head has a through hole, and one end of the through hole is aligned with the battery core rivet hole of the pole piece, and the other end of the through hole is connected to the exhaust pipe; the wind speed sensor is connected to the mounting hole on the pole piece, and the wind speed sensor is connected to the computer; there is an opening between the pole piece and one end of the plastic part of the battery core integrated cover plate, and an air duct is formed between the pole piece and the plastic part, between the pole piece and the pole column, in the through hole, and the exhaust pipe;
[0010] And the detection end of the wind speed sensor is aimed at the wind duct.
[0011] In this embodiment, when the pressure head presses down the electrode, the through hole of the pressure head is aligned with the battery core rivet hole of the electrode, and the negative pressure device exhausts air through the exhaust pipe on the pressure head. If the gap between the electrode and the pole is too large at this time, flowing gas will be generated. The wind speed sensor installed between the electrode and the plastic part will feel the gas flow, and then calculate the size of the gap according to the computer, so as to achieve accurate detection of the gap; because the size of the gap affects the wind speed, the size of the wind speed can be matched with the size of the gap. The utility model can achieve real-time monitoring and alarm. If the gap is greater than the set value, the computer will sound an alarm to ensure that each module welding will not cause poor welding due to unqualified gap. Compared with the traditional metallographic experimental determination, this scheme has the advantages of high efficiency, real-time and low cost.
[0012] Preferably, a mounting hole is provided on the pole piece and on a portion of the cell integrated cover plate above the plastic component, and the wind speed sensor is connected at the mounting hole.
[0013] Preferably, the wind speed sensor is sealed to the mounting hole.
[0014] In order to reduce the influence of air leakage from other parts on the detection results, a sealing structure, such as a sealing ring, is wrapped around the outside of the wind speed sensor. After the wind speed sensor is inserted into the mounting hole, it can achieve closer contact with the mounting hole to prevent air from entering through the gap between the two and affecting the detection results.
[0015] Preferably, the pressure head is an inverted frustum-shaped structure.
[0016] Preferably, the through hole is one or a combination of an L-shaped hole, an inclined hole, and a curved hole.
[0017] Equipment parts above the pressure head can be avoided.
[0018] Preferably, the wind speed sensor is a wind speed sensor with an accuracy of 0.2 M / s.
[0019] Preferably, there are at least two pressure heads and at least two wind speed sensors, the two pressure heads are aligned in an array with the battery cell rivet holes of the pole piece, the wind speed sensor is connected to the pole piece on the side of the pressure head, and at least two of the wind speed sensors are connected to a computer.
[0020] It can meet the needs of sequential detection of gaps between multiple poles and pole pieces.
[0021] Preferably, it also includes an exhaust main pipe, the side of each pressure head is connected to the exhaust pipe, and each exhaust pipe is connected to the exhaust main pipe.
[0022] The advantages of the utility model are:
[0023] In this embodiment, when the pressure head presses down the electrode, the through hole of the pressure head is aligned with the battery core rivet hole of the electrode, and the negative pressure device exhausts air through the exhaust pipe on the pressure head. If the gap between the electrode and the pole is too large at this time, flowing gas will be generated. The wind speed sensor installed between the electrode and the plastic part will feel the gas flow, and then calculate the size of the gap according to the computer, so as to achieve accurate detection of the gap; because the size of the gap affects the wind speed, the size of the wind speed can be matched with the size of the gap. The utility model can achieve real-time monitoring and alarm. If the gap is greater than the set value, the computer will sound an alarm to ensure that each module welding will not cause poor welding due to unqualified gap. Compared with the traditional metallographic experimental determination, this scheme has the advantages of high efficiency, real-time and low cost.
[0024] In order to reduce the influence of air leakage from other parts on the detection results, a sealing structure, such as a sealing ring, is wrapped around the outside of the wind speed sensor. After the wind speed sensor is inserted into the mounting hole, it can achieve closer contact with the mounting hole to prevent air from entering through the gap between the two and affecting the detection results.
[0025] It can meet the needs of sequential detection of gaps between multiple poles and pole pieces. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 It is a structural schematic diagram of a battery module welding gap detection device in Embodiment 1 of the present utility model;
[0027] Figure 2 It is a structural schematic diagram of a battery module welding gap detection device in Embodiment 2 of the present utility model;
[0028] Numbers in the figure:
[0029] 1. Pressure head; 11. Exhaust pipe; 2. Wind speed sensor; 3. Computer; 4. Pole piece; 41. Battery core rivet hole; 5. Plastic parts; 6. Pole; 7. Exhaust main pipe. DETAILED DESCRIPTION
[0030] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model will be clearly and completely described below in combination with the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0031] Embodiment 1:
[0032] like Figure 1 As shown, a battery module welding gap detection device includes a pressure head 1, a wind speed sensor 2, and a computer 3. The pressure head 1 has a through hole, the bottom end of the through hole is located at the bottom of the pressure head 1, and the through hole is aligned with the battery cell rivet hole 41 of the pole piece 4. One side of the pressure head 1 is connected to the exhaust pipe 11, and the other end of the air duct is connected to the exhaust pipe 11. A mounting hole is opened on the pole piece 4, which is located above the plastic part 5 of the battery cell integrated cover plate. The wind speed sensor 2 is connected in the mounting hole, and the detection end of the wind speed sensor 2 is aligned with the air duct. The wind speed sensor 2 is connected to the computer 3. There is an opening between the pole piece 4 and the left end of the plastic part 5 of the battery cell integrated cover plate, and the exhaust pipe 11 is connected to the negative pressure device, so that an air duct is formed between the pole piece 4 and the plastic part 5, between the pole piece 4 and the pole 6, in the through hole, and in the exhaust pipe 11.
[0033] The pressure head 1 can be in the shape of an inverted truncated cone, and can move up and down under the action of a cylinder, etc., and can apply a certain pressure to make the pole piece 4 and the pole 6 fit together as completely as possible. Of course, due to the processing technology and other reasons, there is still a small gap between the pole piece 4 and the pole 6, so it is necessary to detect the gap. The area of the bottom end of the pressure head 1 is adapted to the area of the pole 6 to ensure the compaction effect.
[0034] In order to avoid equipment such as the cylinder at the top, the through hole can be an L-shaped hole, an oblique hole, or other holes as long as the passage can be realized.
[0035] The wind speed sensor 2 uses a wind speed sensor with an accuracy of 0.2M / s, which can meet the use requirements.
[0036] The plastic part 5 is a part of the module integrated cover. Its purpose is to integrate the pole piece 4 to make it integrated and convenient for welding. The material is usually ABS (ABS is one of the five major synthetic resins, acrylonitrile-butadiene-styrene copolymer, a terpolymer composed of acrylonitrile, butadiene and styrene).
[0037] Wherein, a plurality of wind speed sensors 2 may be provided, and the size of the gap is determined by an average value.
[0038] The working process of this embodiment:
[0039] When the pressure head 1 presses down the electrode piece 4, the through hole of the pressure head 1 is aligned with the battery core rivet hole 41 of the electrode piece 4, and the negative pressure device exhausts air through the exhaust pipe 11 on the pressure head 1. If the gap between the electrode piece 4 and the pole 6 is too large at this time, flowing gas will be generated, and the wind speed sensor 2 installed between the electrode piece 4 and the plastic part 5 will feel the gas flow, and then calculate the size of the gap according to the computer 3, thereby realizing accurate detection of the fitting gap.
[0040] Embodiment 2:
[0041] like Figure 2 As shown, the difference between this embodiment and the first embodiment is that this embodiment can detect whether there is a gap between the pole piece 4 and the two poles 6 .
[0042] Specifically, a battery module welding gap detection device includes two pressure heads 1, two wind speed sensors 2, and a computer 3.
[0043] Both of the two pressure heads 1 have a through hole, the bottom end of the through hole is located at the bottom of the pressure head 1, the through hole can be L-shaped, and the through holes of the two pressure heads 1 are respectively aligned with the battery cell rivet holes 41 of the pole piece 4, one side of each of the pressure heads 1 is connected to the exhaust pipe 11, and the other end of the air duct is connected to the exhaust pipe 11, and the two exhaust pipes 11 are connected to the exhaust main pipe 7.
[0044] Two mounting holes are provided on the pole piece 4, located above the plastic part 5 of the cell integrated cover, and the two wind speed sensors 2 are connected in the mounting holes respectively, and the detection ends of the wind speed sensors 2 are aligned with the air duct, and the two wind speed sensors 2 are connected to the computer 3. There is an opening between the pole piece 4 and the left end of the plastic part 5 of the cell integrated cover, and the exhaust main pipe 7 is connected to the negative pressure device, so that an air duct is formed between the pole piece 4 and the plastic part 5, between the pole piece 4 and the pole 6, in the through hole, and the exhaust pipe 11.
[0045] The working process of this embodiment:
[0046] When the pressure head 1 presses down the electrode piece 4, the through hole of the pressure head 1 is aligned with the battery core rivet hole 41 of the electrode piece 4, and the negative pressure device exhausts air through the exhaust pipe 11 on the pressure head 1. If the gap between the electrode piece 4 and the pole 6 is too large at this time, flowing gas will be generated, and the wind speed sensor 2 installed between the electrode piece 4 and the plastic part 5 will feel the gas flow, and then calculate the size of the gap according to the computer 3, thereby realizing accurate detection of the fitting gap.
[0047] In this embodiment, the gaps between the pole piece 4 and the two poles 6 may be detected sequentially, or the gaps between the pole piece 4 and the two poles 6 may be detected simultaneously.
[0048] In the above embodiment, a mounting hole can be pre-opened on the pole piece 4, and the pressure head 1 and the wind speed sensor 2 are connected together by a bracket or the like. When the pressure head 1 moves downward, presses the pole piece 4, and aligns with the battery cell rivet hole 41, the wind speed sensor 2 is correspondingly inserted into the mounting hole to start detection.
[0049] It should be noted that in order to reduce the influence of air leakage from other parts on the detection results, a sealing structure, such as a sealing ring, is wrapped around the outside of the wind speed sensor 2. After the wind speed sensor 2 is inserted into the mounting hole, it can achieve a closer contact with the mounting hole to avoid air entering from the gap between the two and affecting the detection results.
[0050] In the above embodiment, since the size of the gap affects the wind speed, the size of the wind speed can be matched with the size of the gap. This embodiment can achieve real-time monitoring and alarm. If the gap is greater than the set value, the computer 3 will sound an alarm to ensure that each module welding will not cause poor welding due to unqualified fitting gap. This solution has the advantages of high efficiency, real-time and low cost compared to traditional metallographic experimental determination.
[0051] This embodiment can meet the needs of sequentially detecting gaps between multiple poles 6 and pole pieces 4. For example, when detecting the gap on the right side, only the wind speed sensor 2 on the right side is turned on. When detecting the gap on the left side, only the wind speed sensor 2 on the left side is turned on.
[0052] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A battery module welding gap detection device, characterized in that: Including pressure head, wind speed sensor, computer; The pressure head has a through hole, and one end of the through hole is aligned with the battery core rivet hole of the pole piece, and the other end of the through hole is connected to the exhaust pipe; the wind speed sensor is connected to the mounting hole on the pole piece, and the wind speed sensor is connected to the computer; there is an opening between the pole piece and one end of the plastic part of the battery core integrated cover plate, and an air duct is formed between the pole piece and the plastic part, between the pole piece and the pole column, in the through hole, and the exhaust pipe; And the detection end of the wind speed sensor is aimed at the air duct.
2. A battery module welding gap detection device according to claim 1, characterized in that: A mounting hole is provided on the pole piece and on the portion above the plastic part of the battery cell integrated cover plate, and the wind speed sensor is connected at the mounting hole.
3. A battery module welding gap detection device according to claim 1 or 2, characterized in that: The wind speed sensor is sealed and connected to the mounting hole.
4. A battery module welding gap detection device according to claim 1, characterized in that: The pressure head is in an inverted truncated cone structure.
5. A battery module welding gap detection device according to claim 1, characterized in that: The through hole is one or a combination of an L-shaped hole, an inclined hole, and a curved hole.
6. A battery module welding gap detection device according to claim 1, characterized in that: The wind speed sensor has an accuracy of 0.2 M / s.
7. A battery module welding gap detection device according to claim 1, characterized in that: There are at least two pressure heads and at least two wind speed sensors. The two pressure heads are aligned with the rivet holes of the battery core of the pole piece in an array. The wind speed sensor is connected to the pole piece on the side of the pressure head. At least two of the wind speed sensors are connected to a computer.
8. A battery module welding gap detection device according to claim 7, characterized in that: It also includes an exhaust main pipe, the side of each pressure head is connected to the exhaust pipe, and each exhaust pipe is connected to the exhaust main pipe.