Limiting device suitable for laser welding of battery cell module

Abstract

The utility model relates to the field of lithium ion battery preparation, and discloses a limiting device suitable for laser welding of a battery cell module. Comprising a limiting base, the limiting base comprises a bottom plate, two parallel and opposite side plates and a front baffle, a space which is provided with an opening in the front end and used for containing a battery cell module is defined, and first guide rail grooves extending front and back are formed in the outer walls, close to the top, of the two side plates respectively; the comb ruler comprises a base plate, a plurality of comb teeth extending from front to back are arranged on the base plate, the top face of each comb tooth is lower than the top face of the base plate, two second guide rail grooves extending front and back are further formed in the bottom of the base plate, and when one groove walls of the two second guide rail grooves are limited in the two first guide rail grooves of the limiting base respectively, the two second guide rail grooves are separated from each other. The base plate can slide along the two first guide rail grooves and covers the top of the limiting base, the left side and the right side of the base plate exceed the left side plate and the right side plate of the positioning jig respectively, and the comb teeth are located at the top of the space used for containing the battery cell module.

Description

Technical Field

[0001] This utility model relates to the field of battery manufacturing, and in particular to a limiting device suitable for laser welding of battery cell modules. Background Technology

[0002] With the development of new energy sources, lithium-ion batteries are being used more and more widely in various electronic products.

[0003] In the field of battery products, it is often necessary to combine multiple cells to form a cell module. This module is assembled into a battery pack by connecting electrodes in series, parallel, or a combination of both. These series and parallel connections require welding. For example, the welding of polymer cell modules is generally done by soldering or laser welding. Laser welding machines offer better welding results, higher efficiency, and can be automated.

[0004] During the research for this invention, the inventors discovered that polymer-based pouch cells exhibit significant dimensional accuracy variations, making it difficult to achieve complete specification uniformity. Furthermore, laser welding requires high positional accuracy and flatness. The existing technology suffers from the following drawbacks.

[0005] (1) It requires human positioning and limiting, which has low efficiency and is prone to deviation.

[0006] (2) When the large module is not inaccurate, it is easy to cause poor soldering and explosion.

[0007] (3) Large modules are difficult to load and unload, and the precision is insufficient. Summary of the Invention

[0008] One of the objectives of this utility model embodiment is to provide a limiting device suitable for laser welding of battery cell modules, which is applied to the laser welding of the electrode tabs and the adapter plate of the battery cell module, and helps to improve the positioning accuracy of the electrode tabs and the adapter plate.

[0009] Firstly, this embodiment provides a limiting device suitable for laser welding of battery cell modules, comprising:

[0010] The limiting base includes a base plate, two parallel and opposite side plates, and a front baffle, forming a space with an opening at the front end for placing the discharge core module.

[0011] The outer walls of the two side plates near the top are respectively provided with first guide rail grooves extending in the front and back;

[0012] A comb ruler includes a base plate on which a plurality of comb teeth are provided extending from front to back, the top surface of each comb tooth being lower than the top surface of the base plate.

[0013] Two second guide rail grooves extending forward and backward are provided at the bottom of the substrate. When one wall of the two second guide rail grooves is respectively confined within the two first guide rail grooves of the limiting base, the substrate can slide along the two first guide rail grooves. The substrate covers the top of the limiting base. The left and right sides of the substrate extend beyond the left and right side plates of the positioning fixture, respectively. Each comb tooth is located at the top of the space for placing the discharge core module.

[0014] Optionally, it also includes,

[0015] The positioning fixture includes a base, two opposing side plates, and a rear end plate, forming a space with an opening at the front.

[0016] On the inner side of the top of each of the two fixture side plates, there is a guide step that extends forward and backward with its top surface lower than the top surface of the fixture side plate it is located on.

[0017] When the assembly structure of the comb ruler and the limiting base is installed in the positioning fixture, the bottom surfaces of the left and right sides of the base plate are in contact with the top surfaces of the two guide steps, the base plate is limited between the two guide steps, and the base plate can slide along the two guide steps.

[0018] A closable door is connected to the side plate of the first fixture. When the closing door is closed onto the front opening of the positioning fixture, the closing door abuts against the front end of the base plate, and the comb ruler is positioned inside the positioning fixture.

[0019] The first fixture side plate is one of the two fixture side plates, and the other is referred to as the second fixture side plate.

[0020] Optionally, a limiting block is also provided at the rear end of the top of the space within the positioning fixture.

[0021] When the assembly of the comb ruler containing the battery cell module and the base is located within the positioning fixture, the adapter plate of the battery cell module is supported on the top surface of each of the comb teeth, and the rear end face of the adapter plate is located at the front end of the limiting pressure block.

[0022] Optionally, a limiting step is also provided on the top surface of the rear end section of the comb ruler, located behind the load-bearing area of ​​the adapter plate.

[0023] The top surface of the limiting step is lower than the top surface of the substrate and also lower than the top surface of each comb tooth in the bearing area of ​​the adapter plate.

[0024] When the rear end face of the adapter plate of the battery cell module is located at the front end of the limiting pressure block, the limiting platform is inserted below the limiting pressure block, and the rear end section where the limiting step is located is supported on the rear end plate of the positioning fixture.

[0025] Optionally, a limiting step with its top surface lower than the top surface of the movable door is also provided on the inner side of the top of the movable door.

[0026] When the assembly of the comb ruler containing the battery cell module and the base is confined within the space of the positioning fixture,

[0027] When the movable door is engaged with the front opening of the positioning fixture, the front end of the base plate is positioned behind the limiting step of the movable door, and the bottom surface is in contact with the top surface of the limiting step.

[0028] Optionally, magnets are provided on the front end face of the side plate of the second fixture and on the inner side face of the movable door.

[0029] When the magnets on the movable door and the side plate of the second fixture are attracted to each other, the movable door closes at the front opening.

[0030] Optionally, a lockable latch is provided on the outer side of the second fixture side plate and on the outer side of the movable door.

[0031] Optionally, when the lower end of the groove wall of one side of each of the second guide rail grooves of the comb ruler is located within its corresponding first guide rail groove, the upper end of the side wall of each of the first guide rail grooves is located within its corresponding second guide rail groove.

[0032] Optionally, a through hole is provided at the front end of the substrate, and the through hole is located in front of the area where the comb teeth are located.

[0033] Optionally, a handle is provided on the front end face of the front baffle of the limiting base and / or on the front end face of the movable door of the positioning fixture.

[0034] Optionally, a plurality of positioning holes are provided on the outer surfaces of the two side plates of the limiting base.

[0035] As can be seen from the above, the technical solution of this embodiment is applied to the series and parallel welding between the electrode tabs and the adapter plate of the battery cell module. The battery cell module is assembled on the limiting device of this embodiment. In addition to positioning the position of each electrode tab, the comb ruler also provides a bearing platform for the adapter plate 4. The position of the adapter plate is positioned by the cooperation of the comb ruler and the limiting base 1, so that the positions of each electrode tab and the adapter plate are in the predetermined positions, which facilitates the precise positioning of laser welding and avoids problems such as poor welding and explosion caused by inaccurate positioning.

[0036] In addition, the battery cell module 3 is mounted on the limiting device of this embodiment to position the tabs and adapter plate before being transferred to the laser welding equipment for laser welding, which facilitates the transfer of the battery module. For example, multiple positioning holes can be set on the outer side of the two side plates of the limiting base. The robot can move the limiting base through the positioning holes to realize the transfer of the battery cell module and achieve automated manufacturing. Attached Figure Description

[0037] The accompanying drawings, which are provided to further illustrate the present invention and form part of this application, do not constitute an undue limitation of the present invention.

[0038] Figure 1 A schematic diagram of the assembly structure of the battery cell module, positioning fixture, comb ruler, and limiting base provided for an embodiment of this utility model;

[0039] Figure 2 A schematic diagram of the assembly structure of the battery cell module, comb ruler, and limiting base provided in this embodiment of the utility model;

[0040] Figure 3 , 4 These are schematic diagrams showing the structure of the battery cell module provided in this utility model embodiment being loaded into the limiting base via a comb ruler;

[0041] Figure 5 The embodiments of this utility model are provided respectively Figure 3 , 4 The assembly structure shown is a schematic diagram of the assembly structure and the positioning fixture.

[0042] Figure 6 These are schematic diagrams showing the structure of the battery cell module provided in the embodiments of this utility model when it is confined within the positioning fixture.

[0043] 1: Limiting base; 11: Base plate; 12: Side plate; 13: Front baffle;

[0044] 14: First guide rail groove; 15: First handle section

[0045] 2: Comb ruler; 21: Base plate; 22: Comb teeth;

[0046] 23: Second guide rail groove; 24: First limiting step; 25: Through hole;

[0047] 3: Battery cell module; 31: Electrode tab;

[0048] 4: Adapter plate; 41: Electrode extension hole; 42: Welding section;

[0049] 5: Positioning fixture; 51: Fixture base; 52: Fixture side plate;

[0050] 53: Rear end panel; 54: Movable door; 55: Guide steps;

[0051] 56: Limiting block; 57: Second limiting step; 58: Second handle;

[0052] 6: Magnet; 7: Movable latch. Detailed Implementation

[0053] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The illustrative embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention.

[0054] Examples of embodiments of the present invention described in detail below are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.

[0055] The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the invention, but should not be construed as limiting the invention. In the description of the invention, it should be understood that terms such as "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0056] Furthermore, the terms "" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0057] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. Example

[0058] See Figure 1-6 .

[0059] This embodiment provides a limiting device suitable for laser welding of battery cell module 3, which mainly includes: a limiting base 1 and a comb ruler 2, which are independent of each other.

[0060] The limiting base 1 includes a first base plate 11, two side plates 12, and a front baffle 13. The first base plate 11 is used to support the weight of the battery cell module 3. The two side plates 12 and the front baffle 13 are located on the top surface of the first base plate 11 and are perpendicular to the top surface of the first base plate 11. The two side plates 12 are facing each other and parallel. The front baffle 13 is located at the rear end of the two side plates 12. The two side plates 12 and the front baffle 13 form a space with an open rear end and enclosed on three sides on the top surface of the first base plate 11. The battery cell module 3 is inserted into the top plate of the limiting base 1 through the rear opening, and is defined on three sides by the two side plates 12 and the front baffle 13.

[0061] The cell module 3 consists of multiple cells arranged together, with the tabs 31 of the cells extending from the top of the cell module 3, forming at least one row of tabs 31 arrays on the top of the cell module 3.

[0062] During the welding of the tabs 31, an adapter plate 4 is provided at the top of the cell module 3. The adapter plate 4 has a plurality of tab extension holes 41 for the tabs 31 to extend out, and a plurality of welding parts 42 (such as, but not limited to, copper sheets) for welding the tabs 31 are also provided on the top surface of the adapter plate 4. Each welding part 42 is located on the side of each tab extension hole 41. A circuit is pre-set in the adapter plate 4. The tabs 31 of each cell extend out from their corresponding tab extension holes 41 on the top surface of the adapter plate 4. When each tab 31 is welded to its corresponding welding part 42 on the adapter plate 4, the cells are electrically connected together through the adapter plate 4 in series, parallel or a combination of series and parallel. The cell module 3 is called a battery pack facing the external power supply.

[0063] Near the top of the outer surface of each of the two side plates 12 of the limiting base 1, there are two linear guide rail grooves (denoted as first guide rail grooves 14) extending in the front-rear direction. The length of the two first guide rail grooves 14 is the same as the length of the two side plates 12. The front and rear openings of each first guide rail groove 14 are open and are located on the front and rear faces of the side plate 12 respectively. The two first guide rail grooves 14 are located on the outer surfaces of the two side plates 12 opposite to each other.

[0064] The main body of the comb ruler 2 is a base plate 21. The base plate 21 is provided with a plurality of comb teeth 22. The front end of each comb tooth 22 is integrated with the base plate 21. The top surface of each comb tooth 22 is in a plane that is lower than the top surface of the base plate 21 by a predetermined height. When the adapter plate 4 is placed on the top surface of the area where the comb tooth 22 is located, the comb tooth 22 serves as a support platform for the adapter plate 4. The left, right, and front end surfaces of the adapter plate 4 are in contact with the inner end surfaces of the base plate 21 facing the area where the comb tooth 22 is located, thus limiting the three directions of the adapter plate 4. Each comb tooth 22 extends from front to back, and there is a predetermined gap between any two adjacent comb teeth 22. The end of each comb tooth 22 extends to the rear end of the base plate 21, and the comb teeth 22 at the rear end are separated to allow them to pass through each row of tabs 31.

[0065] Two straight guide rail grooves (referred to as second guide rail grooves 23) extending in the front-back direction are provided at the bottom of the base plate 21 of the comb ruler 2. The two second guide rail grooves 23 are parallel and opposite to each other, and the groove openings at the front and rear ends of the two second guide rail grooves 23 are open.

[0066] Let W1 be the width (vertical direction) of each first guide rail groove 14, and W2 be the wall thickness (vertical direction) of the top wall of each first guide rail groove 14. The width (vertical direction) W1' of each second guide rail groove 23 is slightly larger than the top wall thickness W2 of the first guide rail groove 14, and the wall thickness (vertical direction) W2' of the lower wall of each second guide rail groove 23 is slightly narrower than the width W1 of the first guide rail groove 14.

[0067] The lower groove walls of the two second guide rail grooves 23 are inserted into the two first guide rail grooves 14 from the groove end openings at the front end of the two first guide rail grooves 14 respectively, and are respectively confined within the two first guide rail grooves 14.

[0068] Correspondingly, the top-side groove walls of the two first guide rail grooves 14 are inserted into the two second guide rail grooves 23 through the groove end openings at the front ends of the two second guide rail grooves 23, respectively, and are confined within the two second guide rail grooves 23. This forms a double-limiting slider and groove matching structure, ensuring the accuracy of the position of the comb ruler 2 and the limiting base 1, and preventing drifting during sliding. The user pushes the base plate 21 from front to back, and the base plate 21 slides forward in a straight line until it reaches the predetermined position.

[0069] When the battery cell module 3 is installed onto the limiting base 1 through the rear opening of the limiting base 1, the rear ends of the two second guide rail grooves 23 on both sides of the bottom of the base plate 21 of the comb ruler 2 are engaged with the front end groove walls of the two first guide rail grooves 14 on both sides of the limiting base 1, so that the base plate 21 of the comb ruler 2 slides from front to back. Each comb tooth 22 on the base plate 21 extends horizontally and is inserted between the top of the battery cell module 3 and the adapter plate 4. Each comb tooth 22 passes through the gap between each row of electrode tabs 31 in the electrode tab 31 array of the battery cell module 3, so that each electrode tab 31 is located on the side of each comb tooth 22. 2. The portion near the root of each tab 31 located at the bottom of the adapter plate 4 is defined. The end of each tab 31 extends through the tab 31 of the adapter plate 4 and is located on the side of each welding part 42 of the adapter plate 4. The comb ruler 2 is pushed backward along the two guide grooves until the end face of the substrate 21 facing the root of the comb teeth 22 and higher than the top surface of the comb teeth 22 abuts against the front end face of the adapter plate 4. The comb ruler 2 supports the adapter plate 4 on the top of the cell module 3 and is confined within the substrate 21. The end of each comb tooth 22 extends through the gap between the tabs 31 and out of the rear end of the cell module 3. The comb ruler 2 covers the top of the limiting base 1. The left and right sides of the substrate 21 extend beyond the left and right side plates 12 of the limiting base 1 by a predetermined width.

[0070] As can be seen from the above, the technical solution of this embodiment is applied to the series and parallel welding between the tabs 31 and the adapter plate 4 of the battery cell module 3. The battery cell module 3 is mounted on the limiting device of this embodiment. In addition to positioning the position of each tab 31, the comb ruler 2 also provides a bearing platform for the adapter plate 4. The position of the adapter plate 4 is positioned by the cooperation of the comb ruler 2 and the limiting base 1, so that the positions of each tab 31 and the adapter plate 4 are in the predetermined positions, which facilitates the precise positioning of laser welding and avoids problems such as poor welding and explosion caused by inaccurate positioning.

[0071] In addition, the battery module 3 is mounted on the limiting device of this embodiment to position the tab 31 and the adapter plate 4 before being transferred to the laser welding equipment for laser welding, which facilitates the transfer of the battery module. For example, multiple positioning holes can be set on the outer side of the two side plates 12 of the limiting base 1. The robot can move the limiting base 1 through the positioning holes to realize the transfer of the battery module 3 and achieve automated manufacturing.

[0072] As an illustration of this embodiment, this embodiment is also equipped with a positioning fixture 5 that can be mounted on a laser welding equipment to further position and limit the battery cell module 3 that is limited on the limiting base 1 by the comb ruler 2.

[0073] The positioning fixture 5 provided in this embodiment includes a fixture base 51, two fixture side plates 52 and a rear end plate 53, wherein the two fixture side plates 52 and the rear end plate 53 are respectively disposed on the top surface of the fixture base 51 and are perpendicular to the top surface of the fixture base 51.

[0074] The two fixture side plates 52 are opposite each other on the left and right, and the rear end plate 53 is located at the rear end of the two fixture side plates 52 that are opposite each other on the left and right. It forms a space with a front opening on the top surface of the fixture base 51, and the space is laterally limited in three directions around its perimeter.

[0075] A hinged door 54 is connected to the front end of one of the fixture side plates 52 (referred to as the first fixture side plate 52) of the positioning fixture 5. The door 54 can be closed onto the front opening of the positioning fixture 5.

[0076] Each of the side plates 52 of the positioning fixture 5 is provided with a guide step 55 extending forward and backward on the inner side of its top. The top surface of the guide step 55 is lower than the top surface of the side plate 52 of the fixture. The two guide steps 55 are parallel and face each other.

[0077] The mechanism that has already secured the battery module 3 and the adapter plate 4 to the limiting base 1 using the comb ruler 2, with the rear end of the limiting base 1 facing rearward, is pushed into the positioning fixture 5 through the front opening of the positioning fixture 5. Specifically, the bottom surfaces of the left and right sides of the base plate 21 of the comb ruler 2 are supported on the top surfaces of the two guide steps 55 on the side plates 52 of the two fixtures. The base plate 21 of the comb ruler 2 is positioned between the two guide steps 55. The left and right end faces of the base plate 21 are respectively abutted against the vertical end faces of the positioning fixture 5 facing the guide steps 55 to prevent the base plate 21 from shifting left or right. The base plate 21 of the comb ruler 2 slides rearward along the two guide steps 55 of the positioning fixture 5 until the rear end face of the adapter plate 4 abuts against the front end of the limiting pressure block 56 located at the rear end of the positioning fixture 5, thus positioning the base plate 21. The movable door 54 is then closed, with its inner side tightly abutting against the front end face of the base plate 21 of the comb ruler 2, thus defining the positioning of the base plate 21. At this time, all four end faces of the substrate 21 are limited and fixed, and all four end faces of the adapter plate 4 are limited and fixed, and neither can move. During laser welding, each tab 31 extending from the top surface of the adapter plate 4 is bent and pressed tightly against the top surface of each welding part 42 located on the adapter plate 4 by a robot or manual hand, and each tab 31 is laser welded to each welding part 42.

[0078] As can be seen from the above, the limiting device of this embodiment can accurately position the protruding tabs 31 and the adapter plate 4 of the battery cell module 3 in the series and parallel welding process. This is beneficial for achieving precise positioning of laser welding, improving the laser welding effect, and also facilitates the transfer of the battery cell module 3, thereby improving production efficiency.

[0079] As an illustration of this embodiment, a first limiting step 24 is also provided on the top surface of the rear end section of the base plate 21 of the comb ruler 2, which is located after the bearing area of ​​the adapter plate 4. The top surface of the first limiting step 24 is lower than the top surface of the base plate 21, and the top surface of the rear end section of each comb tooth 22 is lower than the top surface of each comb tooth 22 in the bearing area of ​​the adapter plate 4.

[0080] When the assembly structure, which confines the battery module 3 and the adapter plate 4 on the limiting base 1, is mounted onto the positioning fixture 5 of this embodiment using the comb ruler 2, as the base plate 21 of the comb ruler 2 slides backward along the two guide steps 55 of the positioning fixture 5, and the rear end face of the adapter plate 4 abuts against the front end of the limiting pressure block 56 located at the rear end of the positioning fixture 5 for positioning, the first limiting step 24 of the rear end section of the base plate 21 extends below the limiting pressure block 56 of the positioning fixture 5, and the bottom of the rear end section is positioned at the top of the rear end plate 53 of the positioning fixture 5. This allows the rear end section of the base plate 21 to be supported on the rear end plate 53 of the positioning fixture 5, improving the positional stability of the base plate 21 and enhancing the positioning accuracy.

[0081] The rear end section of the substrate 21 with the first limiting step 24 includes the rear end section of the substrate 21 located on both sides of the comb teeth 22, and also includes the rear end section of each comb tooth 22 extending backward beyond the bearing area of ​​the adapter plate 4. This technical solution can improve the bearing capacity of the substrate 21 on the adapter plate 4 and improve the positioning accuracy of the adapter plate 4.

[0082] As an illustration of this embodiment, a second limiting step 57 is also provided on the inner side of the top of the movable door 54 of the positioning fixture 5. The top surface of the second limiting step 57 is lower than the top surface of the movable door 54, and the top surface of the second limiting step 57 is perpendicular to the vertical end face of the movable door 54 facing the side of the second limiting step 57 at a right angle.

[0083] After the mechanism that limits the battery module 3 and the adapter plate 4 to the positioning base 1 by the comb ruler 2 has been pushed to the predetermined position in the positioning fixture 5, when the movable door 54 is closed, the top surface of the second limiting step 57 of the movable door 54 supports the bottom surface of the front end of the base plate 21 of the comb ruler 2. The front end surface of the base plate 21 abuts against the second limiting step 57 of the movable door 54. The movable door 54 limits the position of the front end of the base plate 21 to ensure the accuracy of positioning and avoid displacement.

[0084] As an illustration of this embodiment, magnets 6 are respectively provided on the inner side surface of the movable door 54 on the front end face of the second fixture side plate 52, which is opposite to the first fixture side plate 52 connected to the movable door 54. When the movable door 54 is closed at the front opening of the positioning fixture 5, the magnets 6 on the movable door 54 and the second fixture side plate 52 attract each other. The technical solution of this embodiment can realize the automatic closing of the movable door 54, improving assembly efficiency.

[0085] As an illustration of this embodiment, movable latches that can be locked together are respectively provided on the outer side of the second fixture side plate 52 of the positioning fixture 5 and the outer side of the movable door 54. When the movable door 54 is automatically attracted to the front opening of the positioning fixture 5 by the attraction between the magnets 6, the movable latches on the second fixture side plate 52 and the movable door 54 are engaged and locked, locking the movable door 54 to the front opening and preventing displacement. This ensures the positioning accuracy of the electrodes and adapter plate 4 on the cell module 3, which is beneficial to improving the positioning accuracy of the laser welding between the electrode tab 31 and the adapter plate 4, and also facilitates the operation of the limiting module.

[0086] As an illustration of this embodiment, a first handle 15 for the user to hold is also provided on the outer end face of the front baffle 13 of the limiting base 1, which improves the convenience of assembly.

[0087] As an illustration of this embodiment, a through hole 25 is provided at the front end of the base plate 21 of the comb ruler 2, in front of the area where the comb teeth 22 are located, so that the user can hold and push the base plate 21 to slide, thereby improving the convenience of assembly.

[0088] As an illustration of this embodiment, a second handle 58 for the user to hold is also provided on the outer side of the movable door 54 of the positioning fixture 5, which improves the convenience of assembly.

[0089] The limiting module in this embodiment is particularly suitable for positioning and limiting during laser welding of polymer battery cell modules.

[0090] The embodiments described above do not constitute a limitation on the scope of protection of this technical solution. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the above embodiments should be included within the scope of protection of this technical solution.

Claims

1. A limiting device suitable for laser welding of battery cell modules, characterized in that, include, The limiting base includes a base plate, two parallel and opposite side plates, and a front baffle, forming a space with an opening at the front end for placing the discharge core module. The outer walls of the two side plates near the top are respectively provided with first guide rail grooves extending in the front and back; A comb ruler includes a base plate on which a plurality of comb teeth are provided extending from front to back, the top surface of each comb tooth being lower than the top surface of the base plate. Two second guide rail grooves extending forward and backward are provided at the bottom of the substrate. When one wall of the two second guide rail grooves is respectively confined within the two first guide rail grooves of the limiting base, the substrate can slide along the two first guide rail grooves. The substrate covers the top of the limiting base. The left and right sides of the substrate extend beyond the left and right side plates of the positioning fixture, respectively. Each comb tooth is located at the top of the space used to place the discharge core module.

2. The limiting device suitable for laser welding of battery cell module according to claim 1, characterized in that, It also includes, The positioning fixture includes a base, two opposing side plates, and a rear end plate, forming a space with an opening at the front. On the inner side of the top of each of the two fixture side plates, there is a guide step that extends forward and backward with its top surface lower than the top surface of the fixture side plate it is located on. When the assembly structure of the comb ruler and the limiting base is installed in the positioning fixture, the bottom surfaces of the left and right sides of the base plate are in contact with the top surfaces of the two guide steps, the base plate is limited between the two guide steps, and the base plate can slide along the two guide steps. A closable door is connected to the side plate of the first fixture. When the closing door is closed onto the front opening of the positioning fixture, the closing door abuts against the front end of the base plate, and the comb ruler is positioned inside the positioning fixture. The first fixture side plate is one of the two fixture side plates, and the other is referred to as the second fixture side plate.

3. The limiting device for laser welding of battery cell modules according to claim 2, characterized in that, In The positioning fixture also has a limiting block at the rear end of the top of the space. When the assembly of the comb ruler containing the battery cell module and the base is located within the positioning fixture, the adapter plate of the battery cell module is supported on the top surface of each of the comb teeth, and the rear end face of the adapter plate is located at the front end of the limiting pressure block.

4. The limiting device for laser welding of battery cell modules according to claim 3, characterized in that, A limiting step is also provided on the top surface of the rear end section of the comb ruler, located behind the load-bearing area of ​​the adapter plate. The top surface of the limiting step is lower than the top surface of the substrate and also lower than the top surface of each comb tooth in the bearing area of ​​the adapter plate. When the rear end face of the adapter plate of the battery cell module is located at the front end of the limiting block, the limiting platform is inserted below the limiting block, and the rear end section where the limiting step is located is supported on the rear end plate of the positioning fixture.

5. The limiting device for laser welding of battery cell modules according to claim 2, characterized in that, A limiting step is also provided on the inner side of the top of the movable door, with its top surface lower than the top surface of the movable door. When the assembly of the comb ruler containing the battery cell module and the base is confined within the space of the positioning fixture, When the movable door is engaged with the front opening of the positioning fixture, the front end of the base plate is positioned behind the limiting step of the movable door, and the bottom surface is in contact with the top surface of the limiting step.

6. The limiting device for laser welding of battery cell modules according to claim 2, characterized in that, Magnets are provided on the front end face of the side plate of the second fixture and on the inner side face of the movable door. When the magnets on the movable door and the side plate of the second fixture are attracted to each other, the movable door closes at the front opening.

7. The limiting device for laser welding of battery cell modules according to claim 2, characterized in that, On the outer side of the second fixture side plate and on the outer side of the movable door, there are movable latches that can be locked together.

8. The limiting device for laser welding of battery cell modules according to claim 1, characterized in that, When the lower end of the groove wall of one side of each of the second guide rail grooves of the comb ruler is located within its corresponding first guide rail groove, the upper end of the side wall of each of the first guide rail grooves is located within its corresponding second guide rail groove.

9. The limiting device for laser welding of battery cell modules according to claim 1, characterized in that, A through hole is provided at the front end of the substrate, and the through hole is located in front of the area where the comb teeth are located.

10. The limiting device for laser welding of battery cell modules according to claim 2, characterized in that, A handle is provided on the front end face of the front baffle of the limiting base and / or on the front end face of the movable door of the positioning fixture.

11. The limiting device for laser welding of battery cell modules according to claim 1, characterized in that, The outer surfaces of the two side plates of the limiting base are also provided with a plurality of positioning holes.

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