Square battery structure

Abstract

The utility model discloses a square battery structure which comprises a square shell, a plurality of roll cores, a combined collector plate, a combined cover plate and the like, the plurality of roll cores are jointly arranged in the square shell, and the top end of each roll core is provided with a positive pole lug and a negative pole lug which are arranged on the same side. The combined current collecting disc is provided with a positive current collecting piece and a negative current collecting piece which are insulated from each other, the combined cover plate is provided with a positive current collecting column and a negative current collecting column which are insulated from each other, the combined current collecting disc is installed at the tops of the roll cores, and the combined cover plate is installed at the top of the combined current collecting disc and used for covering and sealing; the positive pole lugs at the top ends of the plurality of roll cores are sequentially and conductively connected with the positive pole current collecting piece and the positive pole current collecting column to lead out positive pole current, and the negative pole lugs at the top ends of the plurality of roll cores are sequentially and conductively connected with the negative pole current collecting piece and the negative pole current collecting column to lead out negative pole current; the improved square battery has the advantages of simple structure, low manufacturing cost, reliability and safety in use, convenience in manufacturing and the like, thereby being beneficial to automatic production and manufacturing.

Description

Technical Field

[0001] This utility model relates to the field of manufacturing technology of square batteries, specifically a square battery structure. Background Technology

[0002] Existing prismatic batteries mainly consist of a prismatic casing, multiple wound cores, a combined current collector, and a combined cover plate. The wound cores are inserted into the prismatic casing through the top port, the combined current collector is then installed on top of the wound cores, and finally the combined cover plate is installed on top of the combined current collector and seals the port. In this configuration, the positive electrode tabs at the ends of the multiple wound cores need to be welded together to the positive current collector plate of the combined current collector to draw out the positive current, and the negative electrode tabs at the ends of the multiple wound cores need to be welded together to the negative current collector plate of the combined current collector to draw out the negative current. However, in traditional prismatic batteries, the positive and negative electrode tabs of each wound core are located separately at the top and bottom of the core. Therefore, in practical use, because the positive electrode tabs at the top of the multiple wound cores are all... Ideally, the positive tabs should be located at the top of the square casing, directly close to the combined current collector. This allows for easy welding and fixing of multiple positive tabs to the positive current collector plates of the combined current collector to form a conductive connection. However, the negative tabs at the bottom of the multiple cores are located at the bottom of the square casing, away from the combined current collector. Therefore, the multiple negative tabs need to be connected together at the bottom first, and then connected upwards from the side of the square casing to the negative current collector plates of the combined current collector. As a result, the lead-out path of the negative tabs is relatively long, often requiring additional components for conductive connection. This increases the complexity of the structural design and the production cost of the product, affects the reliability and safety of use, and makes the manufacturing process more troublesome, which is not conducive to automated production. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a square battery structure that is simple in structure, low in manufacturing cost, reliable and safe in use, more convenient to manufacture, and conducive to automated production.

[0004] The technical problem of this utility model is solved by the following technical solution:

[0005] A square battery structure includes a square casing, multiple wound cores, a combined current collector plate, and a combined cover plate. The top of the square casing has a port, through which the multiple wound cores are collectively inserted into the square casing. Each wound core has a positive electrode tab and a negative electrode tab arranged on the same side at its top. The combined current collector plate has a positive current collector plate and a negative current collector plate, which are insulated from each other. The combined cover plate has a positive current collector post and a negative current collector post, which are insulated from each other. The combined current collector plate is mounted on top of the multiple wound cores, and the combined cover plate is mounted on top of the combined current collector plate and seals the port. The positive electrode tabs at the top of the multiple wound cores are conductively connected to the positive current collector plate, which in turn is conductively connected to the positive current collector post to draw out the positive current. The negative electrode tabs at the top of the multiple wound cores are conductively connected to the negative current collector plate, which in turn is conductively connected to the negative current collector post to draw out the negative current.

[0006] The multiple cores are arranged in a horizontal row and a vertical column, with the horizontal direction being the length direction of the square shell and the vertical direction being the width direction of the square shell. The positive electrode tabs at the top of the multiple cores are all located on the same horizontal straight line, and the negative electrode tabs at the top of the multiple cores are also all located on the same horizontal straight line.

[0007] Both the positive current collector and the negative current collector are straight strips extending laterally, and the positive current collector is simultaneously conductively connected to the same row of positive current collector tabs, and the negative current collector is simultaneously conductively connected to the same row of negative current collector tabs.

[0008] The positive electrode tabs are arranged in multiple rows, and the corresponding positive current collectors are arranged in multiple blocks with the same number of positive electrode tabs. Each positive current collector is connected to a row of positive electrode tabs, and each pair of adjacent positive current collectors is electrically connected through a positive conductive sheet. The negative electrode tabs are arranged in multiple rows, and the corresponding negative current collectors are arranged in multiple blocks with the same number of negative electrode tabs. Each negative current collector is connected to a row of negative electrode tabs, and each pair of adjacent negative current collectors is electrically connected through a negative conductive sheet.

[0009] The two rows of positive electrode tabs are arranged adjacent to each other, and the two rows of positive electrode tabs are connected by the same positive current collector. The two rows of negative electrode tabs are arranged adjacent to each other, and the two rows of negative electrode tabs are connected by the same negative current collector.

[0010] The positive current collector column is electrically connected to the positive current collector plate through a positive current collector connecting strip, and the negative current collector column is electrically connected to the negative current collector plate through a negative current collector connecting strip. Both the positive and negative current collector connecting strips are fitted with insulating tubes.

[0011] The combined current collector is provided with slots. The positive current collector and the negative current collector are both installed on the bottom surface of the combined current collector. The positive current collector is electrically connected to the positive current collector by passing through the slots, and the negative current collector is electrically connected to the negative current collector by passing through the slots.

[0012] Both the positive current collector and the negative current collector are provided with connecting rivets.

[0013] The combined cover plate is provided with an injection hole for injecting electrolyte and a sealing pin to close the injection hole, and also has an explosion-proof valve.

[0014] The square outer shell has multiple mounting slots, and the multiple cores are inserted into the mounting slots one by one.

[0015] Compared with the prior art, this utility model mainly involves loading multiple cores into a square outer shell through the port at the top, with each core having a positive and negative electrode tab arranged on the same side at its top. A positive and negative current collector plate is then mounted on the combined current collector plate, with the positive and negative current collector plates insulated from each other. A positive and negative current collector post is also mounted on the combined cover plate, with the positive and negative current collector posts insulated from each other. The combined current collector plate is then installed on top of the multiple cores, and the combined cover plate is installed on top of the combined current collector plate, sealing the port. Finally, the positive electrode tabs at the top of the multiple cores are connected to the positive current collector plate, and the positive current collector plate is then connected to the positive current collector post to draw out the positive current. Similarly, the negative electrode tabs at the top of the multiple cores are connected to the negative current collector plate, and the negative current collector plate is then connected to the negative current collector post to draw out the negative current. Clearly, because each core has a positive current collector plate at its top... The positive and negative electrodes are arranged on the same side, meaning that the positive and negative electrodes of multiple coils are directly close to the combined current collector. The multiple coils are arranged in rows horizontally and columns vertically, ensuring that the positive electrodes at the top of each coil are on the same horizontal line, and the negative electrodes at the top of each coil are also on the same horizontal line. Therefore, the positive current collector can easily conduct electricity to the positive electrodes in the same row, and the negative current collector can easily conduct electricity to the negative electrodes in the same row. Because the lead-out paths of the positive and negative electrodes of the multiple coils are short, the need for additional components for conductive connections, as required by traditional square batteries, is eliminated. This simplifies the structural design of square batteries, reduces manufacturing costs, increases reliability and safety, and makes manufacturing more convenient, thus greatly facilitating the automated production of square batteries. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] Figure 2 for Figure 1Top view.

[0018] Figure 3 for Figure 2 AA sectional view.

[0019] Figure 4 for Figure 2 BB sectional stereoscopic view.

[0020] Figure 5 for Figure 3 Enlarged view of point C.

[0021] Figure 6 for Figure 1 A schematic diagram of the structure when the combined cover plate is opened.

[0022] Figure 7 for Figure 6 DD sectional view.

[0023] Figure 8 for Figure 6 Top view.

[0024] Figure 9 for Figure 6 A three-dimensional image.

[0025] Figure 10 A top view of the structure where multiple cores are housed within a square casing.

[0026] Figure 11 for Figure 10 EE sectional view (rotated 90° counterclockwise).

[0027] Figure 12 for Figure 11 Enlarged view of point F.

[0028] Figure 13 This is a top view of the square shell structure.

[0029] Figure 14 for Figure 13 A three-dimensional image.

[0030] Figure 15 This is a schematic diagram of the combined collector disk structure (bottom surface structure).

[0031] Figure 16 for Figure 15 GG cross-sectional view.

[0032] Figure 17 for Figure 15 Enlarged cross-sectional view of HH.

[0033] Figure 18 This is a structural schematic diagram of the combined cover plate.

[0034] Figure 19 for Figure 18 Section II.

[0035] Figure 20 for Figure 19 Enlarged view of point J. Detailed Implementation

[0036] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0037] like Figures 1 to 20 As shown, 1. Square outer shell, 11. Mounting groove, 2. Core, 21. Positive electrode tab, 22. Negative electrode tab, 3. Combined current collector plate, 31. Positive current collector piece, 311. Positive conductive piece, 32. Negative current collector piece, 321. Liquid inlet hole, 33. Connecting rivet point, 34. Slot hole, 4. Combined cover plate, 41. Explosion-proof valve, 42. Insulating sleeve, 43. Insulating ring, 44. Washer, 45. Liquid injection hole, 5. Base plate, 101. Positive current collector column, 102. Negative current collector column, 103. Sealing nail, 104. Positive connecting strip, 105. Negative connecting strip, 106. Insulating tube, 107. Insulating bottom ring.

[0038] A square battery structure is widely applicable to the production and manufacturing of square batteries such as lithium batteries or sodium batteries. The square battery structure mainly includes a square shell 1, multiple cores 2, a combined current collector 3, and a combined cover plate 4.

[0039] The square outer shell 1 is rectangular in shape. It has a rectangular port at the top and the bottom of the square outer shell is closed by the bottom plate 5. The square outer shell has multiple mounting slots 11. Each mounting slot is filled with a core 2. That is, when multiple cores 2 are loaded into the square outer shell from the port at the top, the multiple cores 2 will be loaded into the multiple mounting slots 11 one by one.

[0040] Meanwhile, multiple mounting slots 11 are arranged in a horizontal row and a vertical column, with the horizontal direction being the length direction of the square shell and the vertical direction being the width direction of the square shell. For example, in this embodiment... Figure 13 , Figure 14 The design includes two rows of mounting slots 11, with 6 slots in the first row and 5 slots in the second row. The two rows of mounting slots are then placed close together longitudinally, so that multiple cores 2 can be inserted into multiple mounting slots 11 and form horizontal rows and multiple vertical columns that are close together. Therefore, multiple cores 2 can be inserted into the square shell 1 to form a more compact arrangement, so that the internal space of the square shell 1 can be better utilized.

[0041] Of course, in actual use, the number of mounting slots in each row can be more, but usually only two rows need to be designed. The purpose is to allow the square battery to form a flat and elongated shape with a longer length and a width within a certain range, because this flat and elongated shape has a wider range of applications.

[0042] Each core 2 is provided with an insulating bottom ring 107 at its bottom end, and each core 2 is provided with a positive electrode tab 21 and a negative electrode tab 22 arranged on the same side at its top end, so that the positive electrode tabs 21 at the top of multiple cores are all located on the same horizontal straight line, and the negative electrode tabs 22 at the top of multiple cores are also all located on the same horizontal straight line.

[0043] The combined current collector 3 is provided with a positive current collector 31 and a negative current collector 32, and the positive and negative current collectors are insulated from each other; at the same time, both the positive current collector 31 and the negative current collector 32 are straight strips extending laterally, and the positive current collector 31 is simultaneously electrically connected to the positive current collector tabs 21 in the same row, and the negative current collector 32 is simultaneously electrically connected to the negative current collector tabs 22 in the same row.

[0044] When the positive electrode tabs 21 are arranged in multiple rows, the corresponding positive current collectors 31 will be arranged in multiple blocks with the same number of positive electrode tabs. Each positive current collector 31 is connected to a row of positive electrode tabs 21, and each pair of adjacent positive current collectors 31 is electrically connected through a positive conductive sheet 311. When the negative electrode tabs 22 are arranged in multiple rows, the corresponding negative current collectors 32 will be arranged in multiple blocks with the same number of negative electrode tabs. Each negative current collector 32 is connected to a row of negative electrode tabs 22, and each pair of adjacent negative current collectors is electrically connected through a negative conductive sheet.

[0045] Furthermore, if the two rows of positive electrode tabs 21 are arranged adjacently, the two rows of positive electrode tabs can be connected by the same positive current collector 31 for conduction. If the two rows of negative electrode tabs 22 are arranged adjacently, the two rows of negative electrode tabs can also be connected by the same negative current collector 32 for conduction.

[0046] This implementation example Figure 10 The diagram shows two rows of winding cores 2, with both rows of positive electrode tabs 21 located on the outermost horizontal straight line and both rows of negative electrode tabs 22 located on the innermost horizontal straight line, meaning the two rows of negative electrode tabs are designed to be adjacent to each other. Therefore, two positive electrode current collectors 31 and one negative electrode current collector 32 need to be provided on the bottom surface of the positive electrode current collector 3, with the two positive electrode current collectors 31 located on the outermost side and the one negative electrode current collector 32 located in the middle of the two positive electrode current collectors 31.

[0047] In this way, when the combined current collector 3 is installed on top of multiple cores 2, the two rows of positive electrode tabs 21 are in contact with two positive current collector plates 31 respectively, and are welded and fixed to form a conductive connection. Then, the two positive current collector plates 31 need to be connected to each other through positive electrode conductive plates 311 so that the two rows of positive electrode tabs 21 can conduct electricity to each other. The two adjacent rows of negative electrode tabs 22 are in contact with a negative current collector plate 32 together, and are welded and fixed to form a conductive connection. Therefore, there is no need to set up a separate negative electrode conductive plate.

[0048] The combined cover plate 4 is provided with a positive current collector 101 and a negative current collector 102, and the positive and negative current collectors are insulated from each other; the combined cover plate 4 is installed on the top of the combined current collector plate 3 and covers and seals the port of the square outer shell 1 by circumferential welding.

[0049] The positive current collector 101 is electrically connected to the positive current collector plate 31 on the bottom surface of the combined current collector plate 3 through the positive current connecting strip 104 passing through the slot 34 on the combined current collector plate 3, and the negative current collector 102 is electrically connected to the negative current collector plate 32 on the bottom surface of the combined current collector plate 3 through the negative current connecting strip 102 passing through the slot 34 on the combined current collector plate 3.

[0050] Therefore, the positive electrode tabs 21 at the top of multiple cores 2 are connected to the positive current collector 31, and the positive current collector is then connected to the positive current collector post 101 to draw out the positive current. The negative electrode tabs 22 at the top of multiple cores 2 are connected to the negative current collector 32, and the negative current collector is then connected to the negative current collector post 102 to draw out the negative current.

[0051] Both the positive electrode connecting strip 104 and the negative electrode connecting strip 105 are fitted with insulating tubes 106 to prevent short circuits caused by contact with other conductive components; in addition, both the positive electrode current collector 31 and the negative electrode current collector 32 are provided with connecting rivet points 33 to facilitate welding and fixing with the positive electrode connecting strip 104 and the negative electrode connecting strip 105.

[0052] The positive current collector 101 and the negative current collector 102 have the same mounting structure on the combined cover plate 4. In this embodiment, Figure 5 The installation structure of the positive current collector 101 shown is described in detail as an example. The positive current collector 101 is installed in the mounting hole on the combined cover plate 4, and an insulating sleeve 42 is provided on the outside of the positive current collector 101. The bottom of the positive current collector 101 is connected to the positive connecting strip 104. An insulating ring 43 and a washer 44 are provided between the positive connecting strip and the bottom surface of the combined cover plate 4 for insulation.

[0053] The combined cover plate 4 is provided with an injection hole 45 for injecting electrolyte and a sealing nail 103 to close the injection hole. It is also provided with an explosion-proof valve 41 for protection. In this embodiment, the injection hole 45 is located at the center of the combined cover plate 4, and two explosion-proof valves 41 are designed and are symmetrically arranged on both sides of the length direction with the injection hole 45 as the center. In addition, since the negative electrode current collector 32 is located in the middle of the combined current collector plate 3, in order to make the injection of electrolyte more convenient, the negative electrode current collector 32 can also be designed with an inlet hole 321 facing the injection hole 45.

[0054] The manufacturing method of the aforementioned square battery structure includes the following steps:

[0055] Step 1: Select a square housing 1 with a reserved port at the top and a closed bottom, and set multiple mounting slots 11 inside the square housing;

[0056] Step 2: Insert multiple cores 2 into multiple mounting slots 11 one by one, and arrange the multiple cores 2 in the mounting slots in a horizontal row and a vertical column close together. The horizontal direction is the length direction of the square shell, and the vertical direction is the width direction of the square shell. Each core 2 has a positive electrode tab 21 and a negative electrode tab 22 arranged on the same side at its top.

[0057] Step 3: Adjust the insertion position of each core 2 in each mounting slot 11 so that the positive electrode tabs 21 at the top of multiple cores are all located on the same horizontal straight line, and the negative electrode tabs 22 at the top of multiple cores are also all located on the same horizontal straight line.

[0058] Step 4: Install the combined current collector plate 3 with positive current collector 31 and negative current collector 32 on the top of multiple winding cores 2, and make the positive current collector 31 simultaneously conductively connected to the positive current collector tabs 21 in the same row, and the negative current collector 32 simultaneously conductively connected to the negative current collector tabs 22 in the same row.

[0059] Step 5: Connect the positive current collector 101 on the combined cover plate 4 to the positive current collector 31 through the positive current connecting strip 104 through the slot 34 on the combined current collector plate 3. Connect the negative current collector 102 to the negative current collector 32 through the negative current connecting strip 105 through the slot 34 on the combined current collector plate 3. Then install the combined cover plate 4 on the top of the combined current collector plate 3 and cover and seal the port on the top of the square shell.

[0060] Step 6: Inject electrolyte into the square casing 1 through the injection hole 45 on the combined cover plate 4. After the injection is completed, seal the injection hole 45 with the sealing nail 103 to complete the manufacturing of the square battery.

[0061] The lead-out paths of the positive electrode tab 21 and negative electrode tab 22 of the multiple cores 2 of this utility model are relatively short, so the structural design is simpler, the manufacturing cost of the product is reduced, the use is more reliable and safe, and the manufacturing is more convenient, thus greatly facilitating the automated production and manufacturing of square batteries.

[0062] The embodiments described above are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. Furthermore, it should be understood that after reading the teachings of this utility model, those skilled in the art can make various alterations or modifications to it, and these equivalent forms also fall within the scope defined by the appended claims.

Claims

1. A square battery structure, comprising a square casing (1), multiple winding cores (2), a combined current collector (3), and a combined cover plate (4), wherein the top of the square casing (1) is provided with a port, characterized in that, The multiple cores (2) are collectively installed into the square outer shell (1) through the port. Each core (2) has a positive electrode tab (21) and a negative electrode tab (22) arranged on the same side at its top. The combined current collector (3) is provided with a positive current collector plate (31) and a negative current collector plate (32), and the positive and negative current collector plates are insulated from each other. The combined cover plate (4) is provided with a positive current collector column (101) and a negative current collector column (102), and the positive and negative current collector columns are insulated from each other. The combined collector plate (3) is installed on top of multiple cores (2), and the combined cover plate (4) is installed on top of the combined collector plate (3) and covers and seals the port; The positive electrode tabs (21) at the top of the multiple cores (2) are connected to the positive current collector (31) through a common conductive connection, and the positive current collector is then connected to the positive current collector column (101) to draw out the positive current; the negative electrode tabs (22) at the top of the multiple cores are connected to the negative current collector (32) through a common conductive connection, and the negative current collector is then connected to the negative current collector column (102) to draw out the negative current.

2. The square battery structure according to claim 1, characterized in that... The multiple cores (2) are arranged in a horizontal row and in multiple vertical columns, with the horizontal direction being the length direction of the square shell (1) and the vertical direction being the width direction of the square shell (1). The positive electrode tabs (21) at the top of the multiple cores (2) are all located on the same horizontal straight line, and the negative electrode tabs (22) at the top of the multiple cores (2) are also all located on the same horizontal straight line.

3. A square battery structure according to claim 2, characterized in that... The positive current collector (31) and the negative current collector (32) are both straight strips extending laterally, and the positive current collector (31) is simultaneously connected to the positive electrode tabs (21) in the same row, and the negative current collector (32) is simultaneously connected to the negative electrode tabs (22) in the same row.

4. A square battery structure according to claim 3, characterized in that... The positive electrode tabs (21) are arranged in multiple rows, and the corresponding positive current collectors (31) are arranged in multiple blocks with the same number of positive electrode tabs. Each positive current collector (31) is connected to a row of positive electrode tabs (21), and each pair of adjacent positive current collectors (31) is electrically connected through a positive electrode conductive sheet (311). The negative electrode tabs (22) are arranged in multiple rows, and the corresponding negative current collectors (32) are arranged in multiple blocks with the same number of negative electrode tabs. Each negative current collector (32) is connected to a row of negative electrode tabs (22), and each pair of adjacent negative current collectors (32) is electrically connected through a negative electrode conductive sheet.

5. A square battery structure according to claim 3, characterized in that... The two rows of positive electrode tabs (21) are arranged adjacent to each other, and the two rows of positive electrode tabs are connected by the same positive current collector (31). The two rows of negative electrode tabs (22) are arranged adjacent to each other, and the two rows of negative electrode tabs are connected by the same negative current collector (32).

6. A square battery structure according to claim 1, characterized in that... The positive current collector column (101) is electrically connected to the positive current collector plate (31) through the positive current collector connecting strip (104), and the negative current collector column (102) is electrically connected to the negative current collector plate (32) through the negative current collector connecting strip (105). Both the positive current collector connecting strip (104) and the negative current collector connecting strip (105) are fitted with insulating tubes (106).

7. A square battery structure according to claim 6, characterized in that... The combined current collector (3) is provided with a slot (34). The positive current collector (31) and the negative current collector (32) are both installed on the bottom surface of the combined current collector (3). The positive current collector (104) passes through the slot (34) and is electrically connected to the positive current collector (31). The negative current collector (105) passes through the slot (34) and is electrically connected to the negative current collector (32).

8. A square battery structure according to claim 7, characterized in that... Both the positive current collector (31) and the negative current collector (32) are provided with connecting rivet points (33).

9. A square battery structure according to claim 1, characterized in that... The combined cover plate (4) is provided with an injection hole (45) for injecting electrolyte and a sealing nail (103) for sealing the injection hole, and is also provided with an explosion-proof valve (41).

10. A square battery structure according to claim 1, characterized in that... The square outer shell (1) is provided with multiple mounting slots (11), and the multiple cores (2) are installed into the multiple mounting slots (11) one by one.

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