Multi-pole column battery cover plate structure and battery pack

Abstract

The utility model provides a multi-pole column battery cover plate structure which comprises a pressing block, an upper plastic sheet, a cover plate main body, a lower plastic sheet and pole column groups which are sequentially arranged from top to bottom, each pole column group comprises a positive pole column and a negative pole column, a plurality of pole column groups are arranged along the width direction of the cover plate main body, and the plurality of pole column groups are mutually independent; a plurality of positive electrode holes and negative electrode holes are formed in the cover plate main body, the positive electrode holes and the negative electrode holes are formed in the length direction of the cover plate main body at intervals, the sealing rings are arranged on the positive electrode columns and the negative electrode columns in a sleeving mode, the positive electrode columns and the negative electrode columns penetrate through the lower plastic plate to be arranged in the positive electrode holes and the negative electrode holes respectively, and the upper plastic sheet is pressed on the cover plate main body. And the pressing block is connected with the positive pole and the negative pole which penetrate through the upper plastic sheet. According to the battery pack, the plurality of pole groups are arranged, and each pole group corresponds to one battery cell, so that the single battery cell is separated for overcurrent, and the overcurrent capacity of the battery pack is improved on the premise of not increasing the size of the pole.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy batteries, and in particular to a multi-pole battery cover structure and a battery pack. Background Art

[0002] With the development of the new energy industry, the market has higher requirements for batteries with large energy storage and fast charging, and companies are increasingly investing in large-capacity batteries. A common method for installing battery terminals is riveting, where the terminals are fixed to the battery cover via rivet blocks. The terminals conduct current through the battery cells. Current batteries often utilize one or two pairs of terminals for current conduction. With the growing demand for large-capacity batteries, existing battery processing techniques and battery structures are unable to meet the requirements for increased current capacity and faster heat dissipation for large-capacity batteries. Utility Model Content

[0003] The purpose of the present utility model is to address the deficiencies of the above-mentioned prior art and propose a multi-pole battery cover structure and a battery pack, in which multiple pole groups are provided, each pole group corresponds to a battery cell, so that the single battery cell can flow separately, thereby improving the flow capacity of the battery pack without increasing the volume of the poles.

[0004] The utility model proposes a multi-electrode battery cover structure, comprising a pressing block, an upper plastic sheet, a cover body, a lower plastic plate and a pole group, which are arranged in sequence from top to bottom. One pole group includes a positive pole and a negative pole. Several pole groups are arranged along the width direction of the cover body, and the pole groups are independent of each other. The cover body is provided with several positive pole holes and negative pole holes, and the positive pole holes and the negative pole holes are arranged at intervals in the length direction of the cover body. A sealing ring is sleeved on the positive pole and the negative pole. The positive pole and the negative pole pass through the lower plastic plate and are respectively arranged in the positive pole hole and the negative pole hole. The upper plastic sheet is pressed on the cover body, and the pressing block is connected to the positive pole and the negative pole passing through the upper plastic sheet.

[0005] A better technical solution of the present invention is: a positive electrode connecting piece is provided at the bottom of the positive electrode column, a negative electrode connecting piece is provided at the bottom of the negative electrode column, the positive electrode connecting piece is integrally formed with the positive electrode column, and the negative electrode connecting piece is integrally formed with the negative electrode column.

[0006] A better technical solution of the utility model is as follows: the upper plastic sheet includes a positive plastic sheet and a negative plastic sheet, the positive plastic sheet is provided with a positive connecting hole, the negative plastic sheet is provided with a negative connecting hole, the positive pole passes through the positive connecting hole to connect to the pressing block, and the negative pole passes through the negative connecting hole to connect to the pressing block.

[0007] A better technical solution of the present invention is as follows: a positive sink groove is provided on the upper end surface of the cover plate body around the positive electrode hole; a negative sink groove is provided on the upper end surface of the cover plate body around the negative electrode hole, the positive electrode plastic sheet is provided in the positive sink groove, and the negative electrode plastic sheet is provided in the negative sink groove.

[0008] A better technical solution of the utility model is: the pressing block includes a positive riveted block and a negative riveted block, the positive riveted block is provided with a positive fixing hole, the negative riveted block is provided with a negative fixing hole, the positive pole column is fixed to the positive riveted block through the positive fixing hole, and the negative pole column is fixed to the negative riveted block through the negative fixing hole.

[0009] The preferred technical solution of the present invention is that the number of the positive connecting holes, positive fixing holes and positive electrode holes all matches the number of the positive electrode posts, and the number of the negative connecting holes, negative fixing holes and negative electrode holes all matches the number of the negative electrode posts.

[0010] A better technical solution of the present invention is that the cover plate body is provided with a liquid injection hole and a mounting hole for mounting an explosion-proof valve.

[0011] A battery pack, characterized in that it includes the multi-pole battery cover structure and a plurality of battery cells, one pole group matches one battery cell, and the positive pole and negative pole are respectively connected to the positive and negative pole ears of the battery cell.

[0012] The multi-pole battery cover structure and battery pack of the utility model have the following beneficial effects:

[0013] 1. In view of the structural characteristics of a large-capacity battery pack having multiple battery cells, the present application provides multiple electrode groups on the cover body. Each electrode group includes a positive electrode and a negative electrode. Each electrode corresponds to a battery cell. This allows a single battery cell to pass current independently through a electrode group. This improves the current capacity of the entire battery pack without increasing the volume of the electrode, reduces the internal temperature of the battery pack, and increases the service life of the battery cells.

[0014] 2. The positive electrode connecting piece and the positive electrode column are integrally formed, and the negative electrode connecting piece and the negative electrode column are integrally formed. During the battery processing, there is no need to additionally weld the connecting piece and the electrode column, which simplifies the processing technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings, which are incorporated into and constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention. In these drawings, similar reference numerals are used to represent similar elements. The drawings described below are some embodiments of the present invention, but not all. Those skilled in the art can derive other drawings from these drawings without inventive effort.

[0016] Figure 1 It is an explosion entity of an embodiment of the utility model.

[0017] Figure 2 Schematic diagram of a battery pack according to an embodiment of the present invention.

[0018] In the figure: 10, pole group; 11, positive pole; 111, positive electrode connecting piece; 12, negative pole; 121, negative electrode connecting piece; 20, lower plastic plate; 21, positive through hole; 22, negative through hole; 23, through hole; 24, exhaust hole; 30, cover body; 31, positive pole hole; 311, positive sink; 32, negative pole hole; 321, negative sink; 33, injection hole; 34, mounting hole; 40, upper plastic sheet; 41, positive pole plastic sheet; 411, positive connecting hole; 42, negative pole plastic sheet; 421, negative connecting hole; 50, pressing block; 51, positive pole rivet block; 511, positive fixing hole; 52, negative pole rivet block; 521, negative fixing hole; 60, explosion-proof valve; 70, battery cell; 71, positive pole ear; 72, negative pole ear; 80, sealing ring. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. It should be noted that, in the absence of conflict, the embodiments in this application and the features in the embodiments can be arbitrarily combined with each other.

[0020] See also Figure 1 A multi-electrode battery cover structure includes a pressure plate, an upper plastic sheet 40, a cover body 30, a lower plastic plate 20, and a pole group 10, which are arranged in sequence from top to bottom. Each pole group 10 includes a positive pole 11 and a negative pole 12. Several pole groups 10 are arranged on the cover body 30. The positive pole 11 and the negative pole 12 pass through the lower plastic plate 20, the cover body 30, and the upper plastic sheet 40 from below and are fixedly connected to the pressure plate.

[0021] See also Figure 2 A battery pack includes the above-mentioned multi-electrode battery cover structure and multiple battery cells 70. The number of battery cells 70 corresponds to the number of electrode groups 10. Several battery cells 70 are arranged along the width direction of the cover body 30. Correspondingly, several electrode groups 10 are arranged along the width direction of the cover body 30. One electrode group 10 is connected to one battery cell 70. The positive electrode 11 and the negative electrode 12 are respectively connected to the positive electrode tab 71 and the negative electrode tab 72 of the battery cell 70, so that a single battery cell 70 can achieve a single overcurrent, thereby improving the overcurrent capacity of the battery cell 70 without increasing the volume of the positive electrode 11 and the negative electrode 12, reducing the heat generation of the battery cell 70, and increasing the service life of the battery cell 70.

[0022] Please refer again Figure 1 The cover body 30 is provided with a positive electrode hole 31 and a negative electrode hole 32. The positive electrode holes 31 and the negative electrode holes 32 are spaced apart along the length of the cover body 30. The positive electrode post 11 is inserted into the positive electrode hole 31, and the negative electrode post 12 is inserted into the negative electrode hole 32. The number of positive electrode holes 31 is the same as the number of electrode groups 10. Several positive electrode holes 31 and several negative electrode holes 32 are spaced apart along the width of the cover body 30, and the central axes of the positive electrode holes 31 and the central axes of the negative electrode holes 32 are located on the same straight line, so that the battery cells 70 are arranged in a straight line, improving the internal space utilization of the battery pack. The size of the cover body 30 changes with the number of positive electrode holes 31. That is, one cover body 30 is provided for each battery pack, and multiple sets of electrode groups 10 are provided on one cover body 30 corresponding to the number of battery cells 70 in the battery pack.

[0023] An upper plastic sheet 40 is disposed above the cover body 30. The upper plastic sheet 40 includes a positive electrode plastic sheet 41 and a negative electrode plastic sheet 42. The positive electrode plastic sheet 41 is provided with a positive connecting hole 411, and the negative electrode plastic sheet 42 is provided with a negative connecting hole 421. The positive electrode column 11 passes through the positive hole 31 from below the cover body 30 and is disposed within the positive connecting hole. The negative electrode column 12 passes through the negative hole 32 from below and is disposed within the connecting hole. The positive electrode plastic sheet 41 is disposed corresponding to the positive electrode column 11, and several positive electrode columns 11 are disposed on the positive electrode plastic sheet 41. The negative electrode plastic sheet 42 is disposed corresponding to the negative electrode column 12, and several negative electrode columns 12 are disposed on the negative electrode plastic sheet 42. The number of positive communication holes 411 and negative communication holes 421 is the same as the number of electrode groups 10. As the number of electrode groups 10 increases, several positive communication holes 411 extend along the width direction of the cover body 30, and several negative communication holes 421 extend along the width direction of the cover body 30. The sizes of the positive plastic sheet and the negative plastic sheet change with the number of electrode groups 10.

[0024] Furthermore, a positive sink 311 is provided on the upper end surface of the cover body 30 around the positive electrode hole 31. The outer dimensions of the positive sink 311 match those of the positive electrode plastic sheet 41. The positive electrode plastic sheet 41 is disposed within the positive sink 311 to facilitate positioning and quick alignment of the positive electrode hole 31 with the positive connecting hole 411. A negative sink 321 is provided on the upper end surface of the cover body 30 around the negative electrode hole 32. The outer dimensions of the negative sink 321 match those of the negative electrode plastic sheet 42. The negative electrode plastic sheet 42 is disposed within the negative sink 321 to facilitate positioning and quick alignment of the negative electrode hole 32 with the negative connecting hole 421.

[0025] The pressing block 50 is pressed onto the upper plastic sheet 40 and fixedly connected to the positive electrode column 11 and the negative electrode column 12. The pressing block 50 includes a positive electrode rivet block 51 and a negative electrode rivet block 52. In the present application, the positive electrode column 11 is made of aluminum, the negative electrode is made of copper, the cover plate body 30 is an aluminum plate, and the positive electrode rivet block 51 and the negative electrode rivet block 52 are both made of aluminum. The positive electrode rivet block 51 is arranged corresponding to the positive electrode plastic sheet 41, and a positive fixing hole 511 is opened on the positive electrode rivet block 51. The positive electrode column 11 passes through the positive connecting hole 411 and is located in the positive fixing hole 511. The positive electrode column 11 is riveted and fixed to the positive electrode rivet block 51. The negative electrode rivet block 52 is arranged corresponding to the negative electrode plastic sheet 42. A negative fixing hole 521 is opened on the negative electrode rivet block 52. The negative electrode column 12 passes through the negative connecting hole 421 and is located in the negative fixing hole 521. The negative electrode column 12 is riveted and fixed to the negative electrode rivet block 52. The number of positive fixing holes 511 and negative fixing holes 521 is the same as the number of electrode groups 10. As the number of electrode groups 10 increases, several positive connecting holes 411 extend along the width direction of the cover plate body 30, and several negative connecting holes 421 extend along the width direction of the cover plate body 30. The sizes of the positive rivet block 51 and the negative rivet block 52 change with the number of electrode groups 10.

[0026] A lower plastic plate 20 is disposed beneath the cover body 30. Relatively, the lower plastic plate 20 is provided with a positive through-hole 21 and a negative through-hole 22. The positive through-hole 21 corresponds to the positive electrode hole 31, and the negative through-hole 22 corresponds to the negative electrode hole 32. The positive electrode column 11 passes through the positive through-hole 21, the positive electrode hole 31, the positive connecting hole 411, and the positive fixing hole 511 from below the lower plastic plate 20, and is secured to the positive electrode rivet block 51. The negative electrode column 12 passes through the negative through-hole 22, the negative electrode hole 32, the negative connecting hole 421, and the negative fixing hole 521 from below the lower plastic plate 20, and is secured to the negative electrode rivet block 52.

[0027] Preferably, a positive electrode connector 111 is provided at the bottom of the positive electrode column 11, and the positive electrode column 11 and the positive electrode connector 111 are integrally formed. A negative electrode connector 121 is provided at the bottom of the negative electrode column 12, and the negative electrode column 12 and the negative electrode connector 121 are integrally formed. When connecting the electrode assembly 10 and the battery cell 70, the positive electrode column 11 is welded to the positive electrode tab 71 of the battery cell 70 via the positive electrode connector 111, and the negative electrode column 12 is welded to the negative electrode tab 72 of the battery cell 70 via the negative electrode connector 121. No other connection operations are required, which reduces the complexity of the battery assembly process and improves the battery process efficiency.

[0028] Furthermore, to ensure the sealing effect of the cover structure, a sealing ring 80 is provided on both the positive electrode column 11 and the negative electrode column 12. Taking the positive electrode column 11 as an example, after the sealing ring 80 is provided on the positive electrode column 11, the positive electrode connecting piece 111 forms a limit under the sealing ring 80 to prevent the sealing ring 80 from separating from the positive electrode column 11; the same applies to the negative electrode column 12.

[0029] The cover body 30 is provided with an injection hole 33 and a mounting hole 34, with the explosion-proof valve 60 mounted in the mounting hole 34. The lower plastic plate 20 is provided with a through hole 23 and a vent 24. The through hole 23 corresponds to the injection hole 33. After the battery pack is assembled, electrolyte can be injected into the battery pack through the injection hole 33. The vent 24 corresponds to the mounting hole 34 and is used to exhaust gas from the battery pack.

[0030] In this application, the lower plastic plate 20 is injection molded in one piece. The specific installation process is as follows: taking the installation of the positive electrode column 11 as an example, the sealing ring 80 is placed on the positive electrode column 11, the positive electrode plastic sheet 41 is placed on the cover plate body 30 corresponding to the positive sink 311, and the positive electrode hole 31 is aligned with the positive connection hole. The positive electrode column 11 passes through the positive electrode hole 31 and the positive connection from bottom to top. Then, the positive electrode rivet block 51 is placed corresponding to the positive electrode plastic sheet 41, so that the positive electrode column 11 is inserted into the positive electrode fixing hole, and the positive electrode rivet block 51 is riveted to the positive electrode column 11 to complete the installation of the positive electrode column 11. The negative electrode column 12 is similarly installed. Subsequently, injection molding is performed through the mold to form the lower plastic plate 20. The cover structure is assembled with the battery pack. During assembly, one pole group 10 corresponds to one battery cell 70, and the positive pole 11 and the negative pole 12 in one pole group 10 are respectively connected to the positive electrode ear 71 and the negative electrode ear 72 of the battery cell 70, so that in a large-capacity battery pack, a single battery cell 70 can independently pass current, thereby improving the passing current capacity without increasing the volume of the pole and negative pole 12, reducing the heat dissipation of the battery cell 70, and improving the service life of the battery cell 70.

[0031] It should be noted that the number of the electrode group 10, the positive electrode hole 31, the positive connecting hole 411, the positive fixing hole 511, the negative electrode hole 32, the negative connecting hole 421, and the negative fixing hole 521 all correspond to the number of battery cells 70, and the number of battery cells 70 is determined by the production capacity requirements of the battery pack. The drawings of this application only show the solution of a battery pack with two battery cells 70, but the structure of this application does not limit the number of battery cells 70 and the electrode group 10.

[0032] Finally, it should be noted that the above embodiments are intended only to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art will appreciate that modifications may be made to the technical solutions described in the above embodiments, or that some of the technical features may be replaced with equivalents; and such modifications or replacements do not deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A multi-pole battery cover structure, characterized in that: The invention comprises a pressing block (50), an upper plastic sheet (40), a cover body (30), a lower plastic plate (20) and a pole group (10) arranged in sequence from top to bottom, wherein one pole group (10) comprises a positive pole (11) and a negative pole (12), and a plurality of pole groups (10) are arranged along the width direction of the cover body (30), and the plurality of pole groups (10) are independent of each other; a plurality of positive pole holes (31) and negative pole holes (32) are opened on the cover body (30), and the positive pole holes (31) The positive electrode column (11) and the negative electrode column (12) are spaced apart and arranged in the length direction of the cover body (30); the sealing ring (80) is sleeved on the positive electrode column (11) and the negative electrode column (12); the positive electrode column (11) and the negative electrode column (12) pass through the lower plastic plate (20) and are respectively arranged in the positive electrode hole (31) and the negative electrode hole (32); the upper plastic sheet (40) is pressed on the cover body (30); and the pressing block (50) is connected to the positive electrode column (11) and the negative electrode column (12) passing through the upper plastic sheet (40).

2. A multi-pole battery cover structure according to claim 1, characterized in that: A positive electrode connecting piece (111) is provided at the bottom of the positive electrode column (11), and a negative electrode connecting piece (121) is provided at the bottom of the negative electrode column (12); the positive electrode connecting piece (111) and the positive electrode column (11) are integrally formed, and the negative electrode connecting piece (121) and the negative electrode column (12) are integrally formed.

3. The multi-pole battery cover structure according to claim 1, characterized in that: The upper plastic sheet (40) includes a positive electrode plastic sheet (41) and a negative electrode plastic sheet (42). The positive electrode plastic sheet (41) is provided with a positive connecting hole (411), and the negative electrode plastic sheet (42) is provided with a negative connecting hole (421). The positive electrode column (11) passes through the positive connecting hole (411) to connect to the pressing block (50), and the negative electrode column (12) passes through the negative connecting hole (421) to connect to the pressing block (50).

4. The multi-pole battery cover structure according to claim 3, characterized in that: A positive sink groove (311) is provided on the upper end surface of the cover plate body (30) around the positive electrode hole (31); a negative sink groove (321) is provided on the upper end surface of the cover plate body (30) around the negative electrode hole (32); the positive electrode plastic sheet (41) is provided in the positive sink groove (311), and the negative electrode plastic sheet (42) is provided in the negative sink groove (321).

5. The multi-pole battery cover structure according to claim 3, characterized in that: The pressing block (50) comprises a positive electrode riveting block (51) and a negative electrode riveting block (52); the positive electrode riveting block (51) is provided with a positive fixing hole (511), and the negative electrode riveting block (52) is provided with a negative fixing hole (521); the positive electrode column (11) passes through the positive fixing hole (511) and is fixed to the positive electrode riveting block (51); and the negative electrode column (12) passes through the negative fixing hole (521) and is fixed to the negative electrode riveting block (52).

6. The multi-pole battery cover structure according to claim 5, characterized in that: The number of the positive communication holes (411), the positive fixing holes (511), and the positive electrode holes (31) all matches the number of the positive electrode posts (11), and the number of the negative communication holes (421), the negative fixing holes (521), and the negative electrode holes (32) all matches the number of the negative electrode posts (12).

7. The multi-pole battery cover structure according to claim 1, characterized in that: The cover plate body (30) is provided with a liquid injection hole (33) and a mounting hole (34) for mounting an explosion-proof valve (60).

8. A battery pack, characterized in that: It comprises a multi-pole battery cover structure as claimed in any one of claims 1 to 7 and a plurality of battery cells (70), wherein one pole group (10) matches one battery cell (70), and the positive pole (11) and the negative pole (12) are respectively connected to the positive pole ear (71) and the negative pole ear (72) of the battery cell (70).

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