Battery module case cover and battery module

Abstract

The present application provides a battery module case cover and a battery module. The battery module case cover comprises: a case cover body in which welding holes are formed, wherein the welding holes run through the case cover body; electrical connection pieces fixed on one side of the case cover body, wherein welding points are provided on the electrical connection pieces, and are exposed out of the welding holes; and a welding hole sealing cover fixed on the other side of the case cover body and configured to seal the welding holes.

Description

Battery module box cover and battery module

[0001] The present application claims priority to the Chinese patent application No. 202421410566.7, filed on June 19, 2024, to the Chinese Patent Office, the whole content of the above application being incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of batteries, in particular to a battery module box cover and a battery module. BACKGROUND

[0003] The power PACK refers to a battery pack composed of multiple battery monomers, which is usually used in the fields of energy storage systems and electric vehicles. The power PACK includes a battery module, a mechanism system, an electrical system, a thermal management system and a BMS (Battery Management System).

[0004] The power PACK on the market usually also includes a CCS (Cell Contact System) support, and the parts in the power PACK are connected by bolts and nuts. SUMMARY

[0005] However, this arrangement results in low integration, low space utilization, low installation efficiency and high cost of the power PACK.

[0006] The present application provides a battery module box cover, comprising: a box cover body provided with a welding hole penetrating through the box cover body; an electrical connection sheet fixed to one side of the box cover body, the electrical connection sheet having a welding point exposed from the welding hole; and a welding hole sealing cover fixed to the other side of the box cover body and configured to seal the welding hole.

[0007] The present application also provides a battery module, comprising: the above-mentioned battery module box cover; and multiple battery monomers respectively welded to the electrical connection sheets, the positive and negative electrodes of the battery monomers being arranged on the same side of the battery monomers, and the positive and negative electrodes of the battery monomers being respectively welded to different electrical connection sheets. ADVANTAGEOUS EFFECTS

[0008] The battery module box cover provided by the present application integrates the electrical connection sheet on the box cover body, realizes the welding connection of the electrical connection sheet and the battery through the welding hole, and realizes the sealing of the welding hole through the welding hole sealing cover, so that the traditional CCS support can be omitted, thereby improving the integration, space utilization and installation efficiency of the battery module.

[0009] The battery module provided by the present application arranges the positive and negative electrodes of the battery monomers on the same side, which facilitates the welding of the electrical connection sheet on the box cover body. BRIEF DESCRIPTION OF DRAWINGS

[0010] FIG. 1 is a structural diagram of a battery module case cover according to an embodiment of the present application (welding hole sealing cover not shown);

[0011] FIG. 2 is an exploded view of a battery module case cover according to an embodiment of the present application (welding hole sealing cover not shown);

[0012] FIG. 3 is an exploded view of a battery module according to an embodiment of the present application.

[0013] Explanation of Reference Numerals:

[0014] Case cover body - 1; welding hole - 11; partition - 12; fixing plate - 13; welding hole sealing cover - 2; electrical connection tab - 3; welding point - 31; positive electrical connection tab - 32; negative electrical connection tab - 33; series / parallel electrical connection tab - 34; printed circuit board - 4; battery cell - 5; positive electrode - 51; negative electrode - 52; case - 6; adhesive layer - 7. Embodiment of the Invention

[0015] In the description of the present application, unless explicitly defined and limited otherwise, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0016] In the present application, unless explicitly defined and limited otherwise, the first feature "on" or "below" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, and the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, and the horizontal height of the first feature is less than that of the second feature.

[0017] In the description of the present embodiment, the terms "up", "down", "left", "right", "front", "back" and the like orientation or position relationship are based on the orientation or position relationship shown in the drawings, which is for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are used to distinguish the description and have no special meaning.

[0018] Referring to FIGS. 1-3, in a first aspect, embodiments of the present application provide a battery module box cover, comprising:

[0019] The box cover body 1 is provided with a welding hole 11 penetrating through the box cover body 1;

[0020] The electric connecting sheet 3 is fixed on one side of the box cover body 1, and the electric connecting sheet 3 has a welding point 31 exposed from the welding hole 11;

[0021] The welding hole sealing cover 2 is fixed on the other side of the box cover body 1 and is configured to seal the welding hole 11.

[0022] It can be understood that the welding hole 11 on the box cover body 1 is provided for welding operation of the electric connecting sheet 3 and the battery monomer 5 after the box cover body 1 is connected with the box body 6, and the size thereof can be set as required, as long as it can facilitate the welding of the welding point 31 of the electric connecting sheet 3 and the battery monomer 5. The welding point 31 of the electric connecting sheet 3 is configured to be electrically connected with the positive electrode 51 or the negative electrode 52 of the battery monomer 5, thereby realizing the series and parallel connection of the battery monomer 5. The number of the welding hole 11 can be one-to-one corresponding to the welding point 31 on the electric connecting sheet 3, or one-to-many, which can be set as required. The number of the welding hole sealing cover 2 can be one-to-one corresponding to the number of the welding hole 11, or one-to-many. In the present scheme, in order to facilitate the connection of the welding hole sealing cover 2 and the box cover body 1, one welding hole sealing cover 2 can seal multiple welding holes 11.

[0023] In an embodiment, the electric connecting sheet 3 is fixed on the box cover body 1 by injection molding, and the electric connecting sheet 3 is clamped on the box cover body 1.

[0024] It can be understood that the box cover body 1 and the electric connecting sheet 3 are connected by injection molding, that is, the box cover body 1, the welding hole 11 and the electric connecting sheet 3 are processed and formed at one time by injection molding, and after the injection molding is completed, the electric connecting sheet 3 is clamped on the box cover body 1, and the welding point 31 on the electric connecting sheet 3 is exposed from the welding hole 11, which can effectively reduce the processing procedure and improve the processing precision and speed. The electric connecting sheet 3 can also be clamped on the box cover body 1 after the processing of the box cover body 1 is completed, which can realize effective fixation of the electric connecting sheet.

[0025] In an embodiment, the electric connecting piece 3 comprises a positive electrode electric connecting piece 32, a negative electrode electric connecting piece 33, and a series / parallel electric connecting piece 34, the series / parallel electric connecting piece 34 is configured to connect a plurality of battery monomers 5 in series or in parallel to form a battery pack, the positive electrode electric connecting piece 32 is connected with the positive electrode of the battery pack, the negative electrode electric connecting piece 33 is connected with the negative electrode of the battery pack, a plurality of welding holes 11 and series / parallel electric connecting pieces 34 are provided, the electric connecting piece 3 corresponds to the welding hole 11 one by one, the part of the box cover body 1 between the adjacent two welding holes 11 is a partition part 12, every two series / parallel electric connecting pieces 34 form a group, the series / parallel electric connecting pieces 34 in a group are adjacent and integrally arranged, and the series / parallel electric connecting pieces 34 in a group are clamped on the partition part 12 therebetween.

[0026] It can be understood that the positive electrode electric connecting piece 32 is connected with the positive electrode of the battery pack, and the negative electrode electric connecting piece 33 is connected with the negative electrode of the battery pack, that is, the positive electrode and the negative electrode of the battery pack are connected with the electric device to form a loop through the positive electrode electric connecting piece 32 and the negative electrode electric connecting piece 33. By making the electric connecting piece 3 correspond to the welding hole 11 one by one, compared with one welding hole 11 corresponding to a plurality of electric connecting pieces 3, the one-to-one correspondence can make a single welding hole 11 only expose the welding point 11 on the corresponding electric connecting piece 3, which is convenient for the welding operation of the welding point 11, so that the covering area of a single welding hole 11 can be smaller, which is beneficial to improve the strength of the box cover body 1. The partition part 12 is automatically formed when the welding hole 11 is opened on the box cover body 1, the box cover body 1 between the welding holes 11 is the partition part 12, and the shape and size of the partition part 12 can be set as needed. The partition part 12 is configured to fix the series / parallel electric connecting piece 34. By clamping the two series / parallel electric connecting pieces 34 integrally arranged adjacent to each other on the partition part 12 therebetween, the series / parallel electric connecting piece 34 can be stably fixed on the box cover body 1, and at the same time, the welding point 11 on the series / parallel electric connecting piece 34 can be fully exposed in the welding hole 11, thereby facilitating the welding operation.

[0027] In an embodiment, the circumferential side of the welding hole 11 corresponding to the positive electrode electric connecting piece 32 and the negative electrode electric connecting piece 33 is provided with a fixing plate 13, the fixing plate 13 is integrally formed with the box cover body 1, the fixing plate 13 is arranged on the same side of the box cover body 1 as the positive electrode electric connecting piece 32 and the negative electrode electric connecting piece 33, and the positive electrode electric connecting piece 32 and the negative electrode electric connecting piece 33 are respectively arranged in the fixing plate 13 on one side of the welding hole 11 corresponding thereto.

[0028] It can be understood that the fixing plate 13 is integrally formed with the box cover body 1, and the fixing plate 13 is formed on the box cover body 1 when the box cover body 1 is injection molded, and the positive electrode connecting piece 32 and the negative electrode connecting piece 33 are arranged in the fixing plate 13. The fixing plate 13 is arranged on which side of the circumferential direction of the welding hole 11 can be determined according to the direction of the positive electrode connecting piece 32 and the negative electrode connecting piece 33, as long as it is convenient for the arrangement of the positive electrode connecting piece 32 and the negative electrode connecting piece 33.

[0029] In an embodiment, the electric connecting pieces 3 are arranged in groups, each group of electric connecting pieces 3 includes two rows of oppositely arranged electric connecting pieces 3, each row of electric connecting pieces 3 includes a plurality of electric connecting pieces 3, and the arrangement direction of each row of electric connecting pieces 3 is configured to be the same as the arrangement direction A of the battery monomers 5. The positive electrode 51 and the negative electrode 52 of the battery monomer 5 are respectively connected to the electric connecting pieces 3 adjacent to them in the two rows of oppositely arranged electric connecting pieces 3. The welding hole 11 is arranged in multiple, and the welding hole 11 corresponds to the electric connecting piece 3 one by one.

[0030] It can be understood that the number of groups of electric connecting pieces 3 is the same as the number of rows of battery monomers. The positive electrode 51 and the negative electrode 52 of the battery monomer 5 are respectively connected to the electric connecting pieces 3 adjacent to them in the two rows of oppositely arranged electric connecting pieces 3, that is, the positive electrode 51 of the battery monomer 5 is connected to one of the electric connecting pieces 3, and the negative electrode 52 of the battery monomer 5 is connected to the other electric connecting piece 3 opposite to the electric connecting piece 3, which is convenient for realizing the series and parallel connection of the battery monomers 5.

[0031] In an embodiment, the number of welding hole sealing covers 2 is twice the number of groups of electric connecting pieces 3, and each welding hole sealing cover 2 seals a row of welding holes 11.

[0032] It can be understood that each welding hole sealing cover 2 seals a row of welding holes 11, which can reduce the number of welding hole sealing covers 2 and facilitate the installation of the welding hole sealing cover 2 and the box cover body 1.

[0033] In an embodiment, the battery module box cover further includes a printed circuit board 4 (PCB), the printed circuit board 4 and the electric connecting piece 3 are arranged on the same side of the box cover body 1, and the printed circuit board 4 and the electric connecting piece 3 are welded and connected.

[0034] In an embodiment, the welding hole sealing cover 2 is welded and connected with the box cover body 1.

[0035] It can be understood that the welding of the printed circuit board 4 and the electric connecting piece 3 can be operated on the side of the box cover body where the two are located. The printed circuit board 4 can be arranged between the two rows of oppositely arranged electric connecting pieces 3, thereby facilitating the welding of the printed circuit board 4 and the electric connecting piece 3. The printed circuit board 4 and the electric connecting piece 3, and the welding hole sealing cover 2 and the box cover body 1 are welded and connected, which can realize screwless fixing, thereby reducing the number of parts and facilitating installation.

[0036] In a second aspect, embodiments of the present application provide a battery module, comprising:

[0037] The battery module box cover of any of the above embodiments;

[0038] A plurality of battery monomers 5 are respectively welded with the electric connection sheet 3, the positive electrode 51 and the negative electrode 52 of the battery monomer 5 are arranged on the same side of the battery monomer 5, and the positive electrode 51 and the negative electrode 52 of the battery monomer 5 are respectively welded with different electric connection sheets 3.

[0039] It can be understood that the welding of the battery monomer 5 and the electric connection sheet 3 can be carried out after the battery monomer 5 is loaded into the box body 6 and the box cover body 1 is fixedly connected with the box body 6.

[0040] In an embodiment, the battery module further comprises a box body 6, the battery monomer 5 is arranged in the box body 6, and the box body 6 is welded with the box cover body 1.

[0041] It can be understood that the welding connection of the box body 6 and the box cover body 1 can realize screwless fixing, thereby reducing the number of parts and facilitating installation.

[0042] In an embodiment, an adhesive layer 7 is arranged between the side of the battery monomer 5 away from the battery module box cover and the box body 6.

[0043] It can be understood that the adhesive layer 7 can be coated on the bottom of the battery monomer 5, or can be coated on the inner bottom of the box body 6. The thickness and shape of the adhesive layer 7 can be set according to the needs. The adhesive layer 7 can realize the fixed connection of the battery monomer 5 and the box body 6, and the traditional end plate and side plate parts can be omitted, thereby reducing the number of parts and facilitating installation.

Claims

1. A battery module box cover, comprising: The box cover body is provided with welding holes, which penetrate the box cover body; An electrical connector, fixed to one side of the box cover body, the electrical connector having solder joints exposed from the welding holes; and A welding hole sealing cap is fixed to the other side of the box cover body and is configured to seal the welding hole.

2. The battery module box cover according to claim 1, wherein, The electrical connector is fixed to the box cover body by injection molding, and the electrical connector is snapped onto the box cover body.

3. The battery module box cover according to claim 1, wherein, The electrical connector includes a positive electrode connector, a negative electrode connector, and a series / parallel connector. The series / parallel connector is configured to connect multiple battery cells in series or in parallel to form a battery pack. The positive electrode connector is connected to the positive electrode of the battery pack, and the negative electrode connector is connected to the negative electrode of the battery pack. Multiple welding holes and multiple series / parallel connectors are provided, and each connector corresponds to a welding hole. The portion of the cover body between two adjacent welding holes is a partition. Each pair of series / parallel connectors forms a group, and each group of series / parallel connectors is adjacent to each other and integrally formed. Each group of series / parallel connectors is snapped onto the partition between them.

4. The battery module box cover according to claim 3, wherein, A fixing plate is provided on one circumferential side of the welding hole corresponding to each of the positive and negative electrical connection pieces. The fixing plate is integrally formed with the box cover body. The fixing plate and the positive and negative electrical connection pieces are located on the same side of the box cover body. The positive and negative electrical connection pieces are respectively inserted into the fixing plate on the side of their respective welding holes.

5. The battery module box cover according to claim 1, wherein, The electrical connectors are grouped, with each group comprising two rows of oppositely arranged electrical connectors. Each row of electrical connectors comprises multiple electrical connectors, and the arrangement direction of each row of electrical connectors is configured to be the same as the arrangement direction of the battery cells. The positive and negative terminals of the battery cells are respectively connected to the adjacent electrical connectors in the two rows of oppositely arranged electrical connectors. Multiple welding holes are provided, and each welding hole corresponds to one electrical connector.

6. The battery module box cover according to claim 5, wherein, The number of welding hole sealing caps is twice the number of groups of electrical connectors, and each welding hole sealing cap seals one row of welding holes.

7. The battery module box cover according to claim 1, wherein the battery module box cover further comprises a printed circuit board, the printed circuit board and the electrical connecting piece are disposed on the same side of the box cover body, and the printed circuit board and the electrical connecting piece are soldered together; and / or The sealing cap for the welding hole is welded to the body of the box cover.

8. A battery module, comprising: Battery module box cover, the battery module box cover comprising: The box cover body is provided with welding holes, which penetrate the box cover body; An electrical connector, fixed to one side of the box cover body, the electrical connector having solder joints exposed from the welding holes; and A welding hole sealing cap is fixed to the other side of the box cover body and is configured to seal the welding hole.

9. The battery module according to claim 8, wherein, The electrical connector is fixed to the box cover body by injection molding, and the electrical connector is snapped onto the box cover body.

10. The battery module according to claim 8, wherein, The electrical connector includes a positive electrode connector, a negative electrode connector, and a series / parallel connector. The series / parallel connector is configured to connect multiple battery cells in series or in parallel to form a battery pack. The positive electrode connector is connected to the positive electrode of the battery pack, and the negative electrode connector is connected to the negative electrode of the battery pack. Multiple welding holes and multiple series / parallel connectors are provided, and each connector corresponds to a welding hole. The portion of the cover body between two adjacent welding holes is a partition. Each pair of series / parallel connectors forms a group, and each group of series / parallel connectors is adjacent to each other and integrally formed. Each group of series / parallel connectors is snapped onto the partition between them.

11. The battery module according to claim 10, wherein, A fixing plate is provided on one circumferential side of the welding hole corresponding to each of the positive and negative electrical connection pieces. The fixing plate is integrally formed with the box cover body. The fixing plate and the positive and negative electrical connection pieces are located on the same side of the box cover body. The positive and negative electrical connection pieces are respectively inserted into the fixing plate on the side of their respective welding holes.

12. The battery module according to claim 8, wherein, The electrical connectors are grouped, with each group comprising two rows of oppositely arranged electrical connectors. Each row of electrical connectors comprises multiple electrical connectors, and the arrangement direction of each row of electrical connectors is configured to be the same as the arrangement direction of the battery cells. The positive and negative terminals of the battery cells are respectively connected to the adjacent electrical connectors in the two rows of oppositely arranged electrical connectors. Multiple welding holes are provided, and each welding hole corresponds to one electrical connector.

13. The battery module according to claim 12, wherein, The number of welding hole sealing caps is twice the number of groups of electrical connectors, and each welding hole sealing cap seals one row of welding holes.

14. The battery module according to claim 8, wherein the battery module cover further includes a printed circuit board, the printed circuit board and the electrical connector are disposed on the same side of the cover body, and the printed circuit board and the electrical connector are soldered together; and / or The sealing cap for the welding hole is welded to the body of the box cover.

15. The battery module housing cover according to claim 8, comprising: Battery module housing cover as described in any one of claims 1-7; Multiple battery cells are welded to the electrical connecting pieces, with the positive and negative electrodes of each battery cell located on the same side of the battery cell, and the positive and negative electrodes of each battery cell being welded to different electrical connecting pieces.

16. The battery module according to claim 8, wherein, The battery module also includes a housing, in which the individual battery cells are disposed, and the housing is welded to the housing cover.

17. The battery module according to claim 16, wherein an adhesive layer is provided between the side of the battery cell facing away from the battery module cover and the casing.

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