Battery welding tool

Abstract

The utility model relates to the technical field of batteries, and discloses a battery welding tool which comprises a tool body, a containing cavity used for containing a battery is formed in the tool body, the containing cavity is provided with a first side wall and a second side wall which are opposite, and the containing cavity is further provided with a third side wall connected between the first side wall and the second side wall. A plurality of first through holes are formed in the first side wall, a plurality of second through holes are formed in the second side wall, a third through hole and a fourth through hole are formed in the third side wall, and the first through holes, the second through holes, the third through hole and the fourth through hole are all suitable for allowing welding heads to penetrate. By means of the battery welding tool, after the battery is placed in the containing cavity, welding can be completed through the first penetrating hole, the second penetrating hole, the third penetrating hole and the fourth penetrating hole, the welding tool does not need to be replaced, the production efficiency is improved, and the production cost is reduced.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to battery welding fixtures. Background Technology

[0002] The battery is composed of multiple battery cells connected in series and parallel. The battery cells are parallel to each other, and a first bus and a second bus are respectively located on both sides of each battery cell. The electrodes on the first side of each battery cell are welded to the first bus, and the electrodes on the second side of each battery cell are welded to the second bus, thus connecting the battery cells in series and parallel. The first and second buses are respectively welded to the battery management system circuit board (i.e., the BMS board), which not only enables the charging and discharging of each battery cell but also monitors the battery status, ensuring the safe operation of the battery.

[0003] During battery assembly, each individual battery cell, the first busbar, and the second busbar are first placed into a resistance welding fixture. The electrodes at both ends of each battery cell are then resistance welded to the first and second busbars, respectively. Next, the battery management system circuit board, along with the welded battery cells, the first and second busbars, are placed into a laser welding fixture. The first and second busbars on both sides are then laser welded to the battery management system circuit board in the middle. The entire assembly process requires changing welding fixtures, resulting in low production efficiency and high production costs.

[0004] Therefore, how to solve or improve the problem of low production efficiency and high production cost caused by the need to change welding tooling in the battery production process has become an important technical problem to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, this application provides a battery welding fixture to solve or improve the problem of low production efficiency and high production cost caused by the need to change welding fixtures during battery production.

[0006] In a first aspect, this application provides a battery welding fixture, comprising:

[0007] The tooling body has an internal cavity for placing a battery. The cavity has a first sidewall, a second sidewall, and a third sidewall connected between the first sidewall and the second sidewall.

[0008] The first sidewall is provided with a plurality of first through holes, the second sidewall is provided with a plurality of second through holes, and the third sidewall is provided with a third through hole and a fourth through hole. The first through holes, the second through holes, the third through holes and the fourth through holes are all suitable for the welding head to pass through.

[0009] Optionally, the tooling body includes:

[0010] A base, wherein the receiving cavity is disposed on the base, the receiving cavity having a first opening, the first through hole penetrating the outer wall of the base, and the second through hole penetrating the outer wall of the base;

[0011] A first cover plate is detachably connected to the base and closes the first opening, and the third and fourth through holes are formed on the first cover plate.

[0012] Optionally, a first positioning block is connected to the first cover plate, and a first positioning groove is provided on the base. When the first cover plate is connected to the base, the first positioning block is inserted into the first positioning groove.

[0013] Optionally, the base includes:

[0014] The substrate has a receiving cavity disposed on it, and a second opening and a third opening are respectively provided on opposite sides of the receiving cavity;

[0015] The second cover plate is detachably connected to the base and closes the second opening. The first perforation is formed on the second cover plate, and the side wall of the second cover plate near the receiving cavity is the first side wall.

[0016] A third cover plate is detachably connected to the base and closes the third opening. The second perforation is formed on the third cover plate, and the side wall of the third cover plate near the receiving cavity is the second side wall.

[0017] Optionally, a second positioning block is connected to the base, and a second positioning groove is provided on the second cover plate. When the second cover plate is connected to the base, the second positioning block is inserted into the second positioning groove.

[0018] Optionally, a third positioning block is connected to the base, and a third positioning groove is provided on the third cover plate. When the third cover plate is connected to the base, the third positioning block is inserted into the third positioning groove.

[0019] Optionally, a first protrusion is provided on the side of the second cover plate near the receiving cavity. When the second cover plate is connected to the base, the first protrusion extends into the receiving cavity through the second opening.

[0020] Optionally, a second protrusion is provided on the side of the third cover plate near the receiving cavity. When the third cover plate is detachably connected to the base, the second protrusion extends into the receiving cavity through the third opening.

[0021] Optionally, it also includes:

[0022] The first connector connects the second cover plate to the first cover plate via the first connector when the first cover plate is connected to the base and the second cover plate is connected to the base.

[0023] The second connector is used when the first cover plate is detachably connected to the base and the third cover plate is connected to the base body, wherein the third cover plate is connected to the first cover plate via the second connector.

[0024] Optionally, multiple third and fourth perforations are provided.

[0025] This application provides a battery welding fixture, which includes a fixture body with a receiving cavity for placing a battery. Multiple first and second through holes are respectively formed on two opposite side walls of the receiving cavity. Each first through hole communicates with a first side of the receiving cavity, and each second through hole communicates with a second side of the receiving cavity. A third and fourth through hole are formed on the side wall connecting the opposite side walls of the receiving cavity, and both the third and fourth through holes communicate with the receiving cavity.

[0026] Multiple battery cells are placed into the receiving cavity, followed by the battery management system circuit board. Then, the first and second busbars are inserted into the receiving cavity and positioned on either side of each battery cell. This ensures that the electrodes at both ends of each battery cell abut against the first and second busbars. At this point, the solder joints between the first busbar and each battery cell are aligned with a first through-hole, the solder joints between the second busbar and each battery cell are aligned with a second through-hole, the solder joint between the bent portion of the first busbar and the first contact plate is aligned with a third through-hole, and the solder joint between the bent portion of the second busbar and the second contact plate is aligned with a fourth through-hole.

[0027] Thus, the resistance welding head can pass through each of the first through holes to perform resistance welding on the welding joints between the first busbar and each battery cell; the resistance welding head can pass through each of the second through holes to perform resistance welding on the welding joints between the second busbar and each battery cell; the laser welding head can pass through each of the third through holes to perform laser welding on the welding joints between the bent portion of the first busbar and the first contact piece; and the laser welding head can pass through each of the fourth through holes to perform laser welding on the welding joints between the bent portion of the second busbar and the second contact piece. No need to change welding tooling, improving production efficiency and reducing production costs. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of this application, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of a battery welding fixture according to an embodiment of this application;

[0030] Figure 2 This is a first exploded view of a battery welding fixture according to an embodiment of this application;

[0031] Figure 3 This is a second exploded view of a battery welding fixture according to an embodiment of this application;

[0032] Figure 4 This is a schematic diagram of a battery welding fixture (containing a battery) after the second cover has been separated, according to an embodiment of this application.

[0033] Figure 5 This is a front view of a battery welding fixture according to an embodiment of this application;

[0034] Figure 6 This is a schematic diagram of a battery welding fixture (containing a battery) after the first cover has been separated, according to an embodiment of this application.

[0035] Figure 7 for Figure 6 A magnified view of a portion of point D in the middle;

[0036] Figure 8 This is a top view of a battery welding fixture (containing a battery) according to an embodiment of this application.

[0037] Explanation of reference numerals in the attached figures:

[0038] 1. Base; 11. Base body; 111. First threaded hole; 112. Second threaded hole; 113. Third threaded hole; 114. Second positioning block; 115. Third positioning block; 116. Receiving cavity; 1161. First opening; 1162. Second opening; 1163. Third opening; 12. Second cover plate; 121. First through hole; 122. First protrusion; 123. Second mounting hole; 124. Second positioning groove; 125. Fourth mounting hole; 13. Third cover plate; 131. 132. Second protrusion; 133. Third mounting hole; 134. Third positioning groove; 135. Fifth mounting hole; 14. First positioning groove; 2. First cover plate; 21. Third through hole; 22. Fourth through hole; 23. First mounting hole; 24. First positioning block; 25. Fourth threaded hole; 26. Fifth threaded hole; 3. Battery cell; 4. First busbar; 5. Second busbar; 6. Battery management system circuit board; 61. First contact piece; 62. Second contact piece; 7. Retainer. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0040] The following is combined with Figures 1 to 8 This describes an embodiment of the present application.

[0041] According to embodiments of this application, in one aspect, a battery welding fixture is provided, such as... Figure 2 As shown, the battery welding fixture includes a fixture body, and a receiving cavity 116 for placing the battery is provided in the fixture body.

[0042] like Figure 4 and Figure 6 As shown, the battery includes battery cells 3, a first busbar 4, a second busbar 5, and a battery management system circuit board 6. Multiple battery cells 3 are provided, with positive and negative electrodes at both ends of each cell 3. Multiple battery cells 3 are grouped together. The positive electrodes of one group of battery cells 3 are soldered to the first busbar 4, and the negative electrodes are soldered to the second busbar 5, thus connecting this group of battery cells 3 in parallel. The negative electrodes of another group of battery cells 3 are soldered to the first busbar 4, and the positive electrodes are soldered to the second busbar 5, thus connecting this group of battery cells 3 in parallel, and the two groups of battery cells 3 are connected in series. The battery cells 3 are sequentially placed on a holder 7 to form a battery cell group. The battery cells 3 can be cylindrical.

[0043] The first busbar 4 is soldered to the battery management system circuit board 6, and the second busbar 5 is soldered to the battery management system circuit board 6, thereby connecting each battery cell 3, which is connected in series and parallel, to the battery management system circuit board 6. The battery management system circuit board 6, also known as the BMS board, can monitor key parameters of the battery pack in real time, such as voltage, current, and temperature, ensuring that they fluctuate within safe ranges. The BMS board employs multiple protection mechanisms, including overcharge protection, over-discharge protection, short-circuit protection, and overcurrent protection, effectively preventing dangerous situations such as fires and explosions caused by battery abnormalities. The BMS board also has a balancing management function, which can balance the charge of each battery cell, extend the overall lifespan, and improve energy utilization efficiency.

[0044] like Figures 1 to 4 As shown, the receiving cavity 116 is cuboid in shape and has opposing first and second sidewalls, and also has a third sidewall, wherein the third sidewall is connected between the first and second sidewalls.

[0045] A first through hole 121 is formed in the first sidewall, allowing the tooling body to pass through and connect to the outside and the receiving cavity. A second through hole 131 is formed in the second sidewall, allowing the tooling body to pass through and connect to the outside and the receiving cavity. A third through hole 21 is formed in the third sidewall, allowing the tooling body to pass through and connect to the outside and the receiving cavity. A fourth through hole 22 is also formed in the third sidewall, allowing the tooling body to pass through and connect to the outside and the receiving cavity.

[0046] The first group of battery cells is placed into the receiving cavity 116, with each battery cell parallel to the others, and the length direction of each battery cell 3 aligned with the direction from the second sidewall to the first sidewall. The second group of battery cells is then placed into the receiving cavity 116, with the orientation of the second group of battery cells opposite to that of the first group. The battery management system circuit board 6 is then placed into the receiving cavity 116, positioned on top of the uppermost battery cell 3. The battery management system circuit board 6 is provided with a first contact plate 61 and a second contact plate 62.

[0047] like Figure 4As shown, the first busbar 4 and the second busbar 5 are placed inside the receiving cavity 116 and positioned at both ends of each battery cell 3. This ensures that the electrodes at both ends of each battery cell 3 abut against the first busbar 4 and the second busbar 5, respectively. The back side of the contact point between the first busbar 4 and each battery cell 3 is the welding point, and the back side of the contact point between the second busbar 5 and each battery cell 3 is also the welding point. Both the first busbar 4 and the second busbar 5 have bent portions. The bent portion of the first busbar 4 abuts against the first contact piece 61, and the back side of the contact point between the bent portion of the first busbar 4 and the first contact piece 61 is the welding point. The bent portion of the second busbar 5 abuts against the second contact piece 62, and the back side of the contact point between the bent portion of the second busbar 5 and the second contact piece 62 is also the welding point. At this time:

[0048] The first perforation 121 corresponds one-to-one with the battery cell 3, with each first perforation 121 and its corresponding battery cell 3 located on opposite sides of the first busbar 4. The welding joints of the first busbar 4 and each battery cell 3 are aligned with a corresponding first perforation 121. The welding head used for resistance welding can pass through each first perforation 121 and perform resistance welding at the welding joints of the first busbar 4 and each battery cell 3, welding the first busbar 4 and each battery cell 3 at the contact point.

[0049] The second perforation 131 corresponds one-to-one with the battery cell 3, with each second perforation 131 and its corresponding battery cell 3 located on opposite sides of the second busbar 5. The welding joints between the second busbar 5 and each battery cell 3 are aligned with a corresponding second perforation 131. The welding head used for resistance welding can pass through each second perforation 131 and perform resistance welding at the welding joints between the first busbar 4 and each battery cell 3, welding the second busbar 5 and each battery cell 3 at the contact point.

[0050] The third through hole 21 and the first contact piece 61 are located on both sides of the bend of the first busbar 4. The welding point of the bend of the first busbar 4 and the first contact piece 61 is aligned with the third through hole 21. The welding head for laser welding can pass through the third through hole 21 and perform laser welding at the welding point of the bend of the first busbar 4 and the first contact piece 61, welding the bend of the first busbar 4 and the first contact piece 61 at the contact point.

[0051] The fourth through hole 22 and the second contact piece 62 are located on both sides of the bend of the second busbar 5. The weld joint between the bend of the second busbar 5 and the second contact piece 62 is aligned with the fourth through hole 22. A welding head for laser welding can pass through the fourth through hole 22 and perform laser welding at the weld joint between the bend of the second busbar 5 and the second contact piece 62, welding the bend of the second busbar 5 and the second contact piece 62 at the contact point.

[0052] In this way, after placing each battery cell 3, the first busbar 4, the second busbar 5, and the battery management system circuit board 6 into the receiving cavity 116 of the battery welding fixture, resistance welding can be performed between the first busbar 4 and the battery cell 3 through the first through hole 121, resistance welding can be performed between the second busbar 5 and the battery cell 3 through the second through hole 131, laser welding can be performed between the first busbar 4 and the battery management system circuit board 6 through the third through hole 21, and laser welding can be performed between the second busbar 5 and the battery management system circuit board 6 through the fourth through hole 22. This eliminates the need to change the welding fixture, improving production efficiency and reducing production costs.

[0053] like Figure 1 As shown, in an optional embodiment, the tooling body includes a base 1 and a first cover plate 2. The base 1 has a receiving cavity 116, and a first opening 1161 is formed on the side of the receiving cavity 116 away from the bottom. A first through hole 121 is formed on the first side wall of the receiving cavity 116, extending to the outer wall of the base 1, and a second through hole 131 is formed on the second side wall of the receiving cavity 116, extending to the outer wall of the base 1.

[0054] After placing each battery cell 3, the first busbar 4, the second busbar 5, and the battery management system circuit board 6 into the receiving cavity 116 of the battery welding fixture, the welding points of the first busbar 4 and each battery cell 3 are respectively aligned with a first through hole 121, and the welding points of the second busbar 5 and each battery cell 3 are respectively aligned with a second through hole 131.

[0055] A third through hole 21 and a fourth through hole 22 are provided on the first cover plate 2. After the first cover plate 2 is detachably connected to the base 1, the first cover plate 2 closes the first opening 1161. The side of the first cover plate 2 near the receiving cavity 116 is the third sidewall of the receiving cavity 116. The third through hole 21 and the fourth through hole 22 penetrate the first cover plate 2. At this time, the welded joint between the bent part of the first busbar 4 and the first contact piece 61 is aligned with the third through hole 21, and the welded joint between the bent part of the second busbar 5 and the second contact piece 62 is aligned with the fourth through hole 22.

[0056] A first mounting hole 23 can be made on the first cover plate 2, and a corresponding first threaded hole 111 can be made on the base 1. After the first cover plate 2 covers the first opening 1161, the first mounting hole 23 on the first cover plate 2 is aligned with the corresponding first threaded hole 111 on the base 1. A screw is passed through the first mounting hole 23 and screwed into the first threaded hole 111, thereby detachably connecting the first cover plate 2 to the base 1. Installation and disassembly are more convenient.

[0057] In an optional embodiment, for the base 1 and the first cover plate 2, the base 1 is provided with a first positioning part, and the first cover plate 2 is provided with a first positioning element. After the first cover plate 2 is connected to the base 1 and the first opening 1161 is sealed, the first positioning element cooperates with the first positioning part.

[0058] In this way, when the operator installs the first cover plate 2, the first positioning part can be connected with the first positioning part to ensure that the first cover plate 2 is installed in place, and then the first cover plate 2 can be fixedly connected to the base 1, making positioning more convenient.

[0059] Alternatively, the first positioning part can be disposed on the first cover plate 2, and correspondingly, the first positioning member can be disposed on the base 1. As long as it is ensured that the first positioning member and the first positioning part are engaged and connected after the first cover plate 2 is connected to the base 1 and the first opening 1161 is sealed.

[0060] Specifically, the first positioning part can be a first positioning groove 14, and the first positioning element can be a first positioning block 24. Taking an example where the base 1 is provided with a first positioning part and the first cover plate 2 is provided with a first positioning element, as follows: Figure 2 and Figure 3 As shown, a first positioning block 24 is connected to the first cover plate 2. Correspondingly, a first positioning groove 14 is provided on the base 1. After the first cover plate 2 is connected to the base 1 and the first opening 1161 is sealed, the first positioning block 24 is precisely inserted into the first positioning groove 14 to form a mating connection.

[0061] In this way, when installing the first cover plate 2, the operator can ensure that the first cover plate 2 is installed in place by inserting the first positioning block 24 into the first positioning groove 14. Then, the first cover plate 2 can be fixedly connected to the base 1, making positioning more convenient.

[0062] The first positioning part and the first positioning component can also be a pin hole and a positioning pin, respectively.

[0063] As an optional embodiment, such as Figure 2 and Figure 3 As shown, the base 1 includes a base 11, a second cover plate 12, and a third cover plate 13. The base 11 has a receiving cavity 116, which has a first opening 1161, a second opening 1162, and a third opening 1163. The second opening 1162 and the third opening 1163 are located on opposite sides of the receiving cavity 116, and the first opening 1161 is located between the second opening 1162 and the third opening 1163. The second cover plate 12 and the third cover plate 13 each have a first positioning groove 14, and both sides of the first cover plate 12 are connected to first positioning blocks 24.

[0064] The second cover plate 12 has multiple first through holes 121, and the third cover plate 13 has multiple second through holes 131. After each battery cell 3, the first busbar 4, the second busbar 5, and the battery management system circuit board 6 are placed into the receiving cavity 116 of the battery welding fixture:

[0065] The second cover plate 12 is detachably connected to the base 11, so that the second cover plate 12 seals the second opening 1162. At this time, the side of the second cover plate 12 near the receiving cavity 116 is the first side wall of the receiving cavity 116. The welding points of the first busbar 4 and each battery cell 3 are respectively aligned with a first through hole 121.

[0066] The third cover plate 13 is detachably connected to the base 11, so that the third cover plate 13 seals the third opening 1163. At this time, the side of the third cover plate 13 near the receiving cavity 116 is the second side wall of the receiving cavity 116. The welding points of the second busbar 5 and each battery cell 3 are respectively aligned with a second through hole 131.

[0067] Finally, the first cover plate 2 is detachably connected to the base 11, so that the first cover plate 2 closes the first opening 1161. At this time, the side of the first cover plate 2 near the receiving cavity 116 is the third side wall of the receiving cavity 116. The bent part of the first busbar 4 and the welding point of the first contact piece 61 are aligned with the third through hole 21. The bent part of the second busbar 5 and the welding point of the second contact piece 62 are aligned with the fourth through hole 22.

[0068] At this time, the first positioning block 24 on the first side of the first cover plate 2 is inserted into the first positioning groove 14 opened on the second cover plate 12, and the first positioning block 24 on the second side of the first cover plate 2 is inserted into the first positioning groove 14 opened on the third cover plate 13.

[0069] For the second cover plate 12 to be detachably connected to the base 11, a second mounting hole 123 can be opened on the second cover plate 12, and a corresponding second threaded hole 112 can be opened on the base 11. After the second cover plate 12 covers the second opening 1162, the second mounting hole 123 on the second cover plate 12 is aligned with the corresponding second threaded hole 112 on the base 11. The screw is passed through the second mounting hole 123 and screwed into the second threaded hole 112, thereby detachably connecting the second cover plate 12 to the base 11, making installation and disassembly more convenient.

[0070] For the third cover plate 13 to be detachably connected to the base 11, a third mounting hole 133 can be opened on the third cover plate 13, and a corresponding third threaded hole 113 can be opened on the base 11. After the third cover plate 13 covers the third opening 1163, the third mounting hole 133 on the third cover plate 13 is aligned with the corresponding third threaded hole 113 on the base 11. The screw is passed through the third mounting hole 133 and screwed into the third threaded hole 113, thereby detachably connecting the third cover plate 13 to the base 11, making installation and disassembly more convenient.

[0071] In an optional embodiment, for the base 11 and the second cover plate 12, the base 11 is provided with a second positioning part, and the second cover plate 12 is provided with a second positioning member. After the second cover plate 12 is connected to the base 11 and the second opening 1162 is sealed, the second positioning member is engaged with the second positioning part.

[0072] In this way, when the operator installs the second cover plate 12, the first cover plate 2 can be installed in place by connecting the second positioning component with the second positioning part, and then the second cover plate 12 can be fixedly connected to the base 11, making positioning more convenient.

[0073] Alternatively, the second positioning part can be disposed on the second cover plate 12, and the corresponding second positioning member can be disposed on the base 11. As long as the second cover plate 12 is connected to the base 11 and the second opening 1162 is sealed, the second positioning member and the second positioning part can be connected in cooperation.

[0074] Specifically, the second positioning part can be the second positioning groove 124, and the second positioning element can be the second positioning block 114. Taking an example where the base 11 has a second positioning part and the second cover plate 12 has a second positioning element, as follows... Figure 2 and Figure 3 As shown, a second positioning block 114 is connected to the second cover plate 12. Correspondingly, a second positioning groove 124 is provided on the base 11. After the second cover plate 12 is connected to the base 11 and the second opening 1162 is sealed, the second positioning block 114 is precisely inserted into the second positioning groove 124 to form a mating connection.

[0075] In this way, when installing the second cover plate 12, the second cover plate 12 can be positioned by inserting the second positioning block 114 into the second positioning groove 124 to ensure that the second cover plate 12 is in place. Then, the second cover plate 12 can be fixedly connected to the base 11, making positioning more convenient.

[0076] The second positioning part and the second positioning component can also be a pin hole and a positioning pin, respectively.

[0077] For the base 11 and the third cover plate 13, the base 11 is provided with a third positioning part, and the second cover plate 12 is provided with a third positioning member. After the third cover plate 13 is connected to the base 11 and the third opening 1163 is sealed, the second positioning member is connected with the second positioning part.

[0078] In this way, when the operator installs the third cover plate 13, the third positioning component can be connected with the third positioning part to ensure that the third cover plate 13 is installed in place, and then the third cover plate 13 can be fixedly connected to the base 11, making positioning more convenient.

[0079] Alternatively, the third positioning part can be set on the third cover plate 13, and the corresponding third positioning member can be set on the base 11. As long as the third cover plate 13 is connected to the base 11 and the third opening 1163 is sealed, the third positioning member and the third positioning part can be connected in cooperation.

[0080] Specifically, the third positioning part can be a third positioning groove 134, and the third positioning element can be a third positioning block 115. Taking an example where the base 11 has a third positioning part and the third cover plate 13 has a third positioning element, as follows... Figure 2 and Figure 3 As shown, a third positioning block 115 is connected to the third cover plate 13. Correspondingly, a third positioning groove 134 is provided on the base 11. After the third cover plate 13 is connected to the base 11 and the third opening 1163 is sealed, the third positioning block 115 is precisely inserted into the third positioning groove 134 to form a mating connection.

[0081] In this way, when installing the third cover plate 13, the third positioning block 115 can be inserted into the third positioning groove 134 to ensure that the third cover plate 13 is installed in place. Then, the third cover plate 13 can be fixedly connected to the base 11, making positioning more convenient.

[0082] The second positioning part and the second positioning component can also be a pin hole and a positioning pin, respectively.

[0083] Among them, the following situations are possible:

[0084] The second positioning part is the second positioning groove 124, and the second positioning element is the second positioning block 114;

[0085] Alternatively, the third positioning part may be the third positioning groove 134, and the third positioning component may be the third positioning block 115;

[0086] Alternatively, the second positioning part is the second positioning groove 124, the second positioning element is the second positioning block 114, the third positioning part is the third positioning groove 134, and the third positioning element is the third positioning block 115.

[0087] As an optional embodiment, such as Figures 1 to 4As shown, a first protrusion 122 is provided on the second cover plate 12. The first protrusion 122 is located on the side of the second cover plate 12 near the receiving cavity 116. That is, after the second cover plate 12 is detachably connected to the base 11 and the second opening 1162 is sealed, the first protrusion 122 extends into the receiving cavity 116 from the second opening 1162 and abuts against the first busbar 4, thereby pressing the first busbar 4 against the electrodes of each battery cell 3. This ensures that the first busbar 4 is in close contact with the electrodes of each battery cell 3, facilitating welding.

[0088] As an optional embodiment, such as Figures 1 to 4 As shown, a second protrusion 132 is provided on the third cover plate 13. The second protrusion 132 is located on the side of the third cover plate 13 near the receiving cavity 116. That is, after the third cover plate 13 is detachably connected to the base 11 and the third opening 1163 is sealed, the second protrusion 132 extends into the receiving cavity 116 from the third opening 1163 and abuts against the second busbar 5, thereby pressing the second busbar 5 against the electrodes of each battery cell 3. This ensures that the second busbar 5 is in close contact with the electrodes of each battery cell 3, facilitating welding.

[0089] In some embodiments, while the second cover plate 12 is provided with a first protrusion 122, the third cover plate 13 is provided with a second protrusion 132.

[0090] As an optional embodiment, the battery welding fixture also includes a first connector and a second connector.

[0091] After placing each battery cell 3, the first busbar 4, the second busbar 5, and the battery management system circuit board 6 into the receiving cavity 116 of the battery welding fixture, the second cover plate 12 is connected to the base 11, thereby sealing the second opening 1162. The third cover plate 13 is then connected to the base 11, thereby sealing the third opening 1163. Finally, the first cover plate 2 is connected to the base 11, thereby closing the first opening 1161.

[0092] After this, the second cover plate 12 is connected to the first cover plate 2 using the first connector, and then the third cover plate 13 is connected to the first cover plate 2 using the second connector. This further increases the stability of the battery welding fixture.

[0093] The first connector can be a screw. A fourth mounting hole 125 is provided on the second cover plate 12, and a fourth threaded hole 25 is provided on the first cover plate 2. After the second cover plate 12 is detachably connected to the base 11 and the first cover plate 2 is detachably connected to the base 11, the screw, which serves as the first connector, can be passed through the fourth mounting hole 125 and screwed into the fourth threaded hole 25, thereby connecting the second cover plate 12 and the first cover plate 2 using the first connector.

[0094] The second connector can be a screw. A fifth mounting hole 135 is provided on the third cover plate 13, and a fifth threaded hole 26 is provided on the first cover plate 2. After the third cover plate 13 is detachably connected to the base 11 and the first cover plate 2 is detachably connected to the base 11, the screw, which serves as the second connector, can be passed through the fifth mounting hole 135 and screwed into the fifth threaded hole 26, thereby connecting the third cover plate 13 and the first cover plate 2 using the second connector.

[0095] As an optional embodiment, such as Figures 6 to 8 As shown, multiple third perforations 21 and multiple fourth perforations 22 are provided. After more battery cells 3 are placed into the receiving slot, the multiple battery cells 3 are arranged sequentially. A fixed number of battery cells 3 form a battery cell group. The third and fourth perforations are arranged sequentially in the direction of the arrangement of multiple battery cell groups.

[0096] like Figure 6 and Figure 7 As shown, the battery management system circuit board 6 is provided with multiple first contact pieces 61 and multiple second contact pieces 62. The multiple first contact pieces 61 and multiple second contact pieces 62 are arranged sequentially in the arrangement direction of multiple battery cell groups. The battery management system circuit board 6 is placed in the receiving slot.

[0097] Both the first busbar 4 and the second busbar 5 have bent portions. Multiple first busbars 4 are placed into the receiving groove, arranged sequentially along the arrangement direction of multiple battery cell groups. At this time, each first busbar 4 abuts against the electrodes of a specified number of battery cells 3. Multiple second busbars 5 are then placed into the receiving groove, arranged sequentially along the arrangement direction of the multiple battery cell groups. At this time, each second busbar 5 abuts against the electrodes of a specified number of battery cells 3.

[0098] At this time, the bent portion on each first busbar 4 abuts against a first contact piece 61, and the welding point between the bent portion on each first busbar 4 and the first contact piece 61 is aligned with a third through hole 21. The bent portion on each second busbar 5 abuts against a second contact piece 62, and the welding point between the bent portion on each second busbar 5 and the second contact piece 62 is aligned with a third through hole 21. Thus, multiple first busbars 4 can be soldered to the battery management system circuit board 6 simultaneously, and multiple second busbars 5 can also be soldered to the battery management system circuit board 6 simultaneously.

[0099] For each individual battery cell 3, a fixed number of battery cells 3 form a group. The first busbar 4 has one more busbar than the second busbar 5.

[0100] In this configuration, the positive electrode of the first group of battery cells 3 is connected to the first first busbar 4, and the negative electrode is connected to the first second busbar 5. The positive electrode of the second group of battery cells 3 is connected to the first second busbar 5, and the negative electrode is connected to the second first busbar 4. The positive electrode of the third group of battery cells 3 is connected to the second first busbar 4, and the negative electrode is connected to the second second busbar 5. The positive electrode of the fourth group of battery cells 3 is connected to the second second busbar 5, and the negative electrode is connected to the third first busbar 4.

[0101] Similarly, the positive terminal of the last group of battery cells 3 is connected to the last second busbar 5, and the negative terminal is connected to the last second busbar 5. Thus, multiple first busbars 4 and second busbars 5 connect the various groups of battery cells 3 in series to form a battery pack, with the first first busbar 4 serving as the positive terminal of the battery pack and the last first busbar 4 serving as the negative terminal of the battery pack.

[0102] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and such modifications and variations all fall within the scope defined by this application.

Claims

1. A battery welding fixture, characterized by, The tool body comprises: a base (1), the accommodating cavity (116) is arranged on the base (1), the accommodating cavity (116) is provided with a first opening (1161), the first perforation (121) penetrates the outer wall of the base (1), and the second perforation (131) penetrates the outer wall of the base (1); a first cover plate (2) is detachably connected to the base (1) and closes the first opening (1161), the third perforation (21) and the fourth perforation (22) are arranged on the first cover plate (2), and the first cover plate (2) is adjacent to the third side wall of the accommodating cavity (116).

2. The battery welding fixture of claim 1, wherein, One of the base (1) and the first cover plate (2) is provided with a first positioning portion, and the other is provided with a first positioning piece; in the state that the first cover plate (2) is connected to the base (1), the first positioning piece is connected to the first positioning portion in a matched mode. The first positioning portion is a first positioning groove (14), and the first positioning piece is a first positioning block (24); in the state that the first cover plate (2) is connected to the base (1), the first positioning block (24) is inserted into the first positioning groove (14). The base (1) comprises:

3. The battery welding fixture of claim 2, wherein, a base body (11), the accommodating cavity (116) is arranged on the base body (11), and opposite sides of the accommodating cavity (116) are respectively provided with a second opening (1162) and a third opening (1163); 4. The battery welding fixture of claim 3, wherein, a second cover plate (12) is detachably connected to the base body (11) and closes the second opening (1162), the first perforation (121) is arranged on the second cover plate (12), and the second cover plate (12) is adjacent to the first side wall of the accommodating cavity (116); 5. The battery welding fixture of claim 2, wherein, a third cover plate (13) is detachably connected to the base body (11) and closes the third opening (1163), the second perforation (131) is arranged on the third cover plate (13), and the third cover plate (13) is adjacent to the second side wall of the accommodating cavity (116). One of the base body (11) and the second cover plate (12) is provided with a second positioning portion, and the other is provided with a second positioning piece; in the state that the second cover plate (12) is connected to the base body (11), the second positioning piece is connected to the second positioning portion in a matched mode. ​ ​ 6. The battery welding fixture of claim 5, wherein, ​ One of the base body (11) and the third cover plate (13) is provided with a third positioning part, and the other is provided with a third positioning piece, and in the state that the third cover plate (13) is connected to the base body (11), the third positioning piece is connected with the third positioning part in cooperation.

7. The battery welding fixture of claim 6, wherein, The second positioning part is a second positioning groove (124), and the second positioning piece is a second positioning block (114), and in the state that the second cover plate (12) is connected to the base body (11), the second positioning block (114) is inserted into the second positioning groove (124); And / or, the third positioning part is a third positioning groove (134), and the third positioning piece is a third positioning block (115), and in the state that the third cover plate (13) is connected to the base body (11), the third positioning block (115) is inserted into the third positioning groove (134).

8. The battery welding fixture of claim 5, wherein, The second cover plate (12) is provided with a first protruding part (122) on the side close to the containing cavity (116), and in the state that the second cover plate (12) is connected to the base body (11), the first protruding part (122) extends into the containing cavity (116) through the second opening (1162); And / or, the third cover plate (13) is provided with a second protruding part (132) on the side close to the containing cavity (116), and in the state that the third cover plate (13) is detachably connected to the base body (11), the second protruding part (132) extends into the containing cavity (116) through the third opening (1163).

9. The battery welding fixture of claim 5, wherein, Further comprising: A first connecting piece, in the state that the first cover plate (2) is connected to the base (1) and the second cover plate (12) is connected to the base body (11), the second cover plate (12) is connected with the first cover plate (2) through the first connecting piece; A second connecting piece, in the state that the first cover plate (2) is detachably connected to the base (1) and the third cover plate (13) is connected to the base body (11), the third cover plate (13) is connected with the first cover plate (2) through the second connecting piece.

10. The battery welding fixture of claim 1, wherein, The third perforation (21) and the fourth perforation (22) are both provided with a plurality of.

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