Square battery

Abstract

The utility model provides a square battery which comprises a shell, a bottom plate, a top cover, a roll core, an insulating pad, two connecting sheets and two conductive terminals, an opening is formed in the bottom of the shell, an open window and two connecting parts are arranged on the top surface of the shell, and the two connecting parts are located on the two sides of the open window respectively; the bottom plate is connected with the opening; the top cover is used for being connected with the open window; the two connecting sheets are respectively connected with the positive tab and the negative tab of the roll core and are both positioned in the shell; the conductive terminal is arranged on the connecting part and is connected with the connecting sheet; the insulating pad is located between the top surface and the connecting sheet. The conductive terminal is installed on the connecting part, the connecting piece is connected with the conductive terminal firstly, the positive tab and the negative tab of the roll core penetrate out of the window and then are welded to the connecting piece, tab bending is not needed after welding, the insulation pad is located between the top face and the connecting piece, the insulation pad does not need to be used for pressing the roll core and can be made thin, and tab bending space does not need to be provided. And the roll core can be relatively higher, so that the energy density of the battery is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a square battery. Background Art

[0002] With the development of the new energy industry, batteries are used in more and more fields. Under the premise of ensuring the safety and stability of batteries during use, the demand for lightweight, low-cost and high-capacity battery structures is increasing.

[0003] Existing prismatic batteries typically consist of a top cover, an aluminum shell, and a battery cell. The conductive terminals are typically integrated into the top cover, and the cell tabs are welded to the connectors before being welded to the top cover. This battery structure sacrifices significant space for tab folding, limiting the cell's height and limiting the required energy density. Utility Model Content

[0004] In view of this, the present invention proposes a square battery to solve the technical problem that the battery structure proposed in the above background technology sacrifices a large amount of space for folding the tabs, resulting in the battery cell height cannot be increased and the capacity density cannot meet the requirements.

[0005] The technical solution of the present utility model is achieved as follows:

[0006] The utility model provides a square battery, comprising a shell, a bottom plate, a top cover, a winding core, an insulating pad, two connecting pieces and two conductive terminals, wherein:

[0007] The bottom of the shell is provided with an opening, and the top surface is provided with a window and two connecting parts, and the two connecting parts are respectively located on both sides of the window;

[0008] The bottom plate is used to connect with the opening;

[0009] The top cover is used to connect with the window;

[0010] The two connecting pieces are respectively connected to the positive electrode tab and the negative electrode tab of the winding core, and are both located in the shell;

[0011] The conductive terminal is mounted on the connecting portion and connected to the connecting piece;

[0012] The insulating pad is located between the top surface and the connecting piece.

[0013] On the basis of the above technical solution, preferably, the insulating pad is provided with an escape hole, and the escape hole is used for allowing the positive electrode tab and the negative electrode tab to pass through.

[0014] Based on the above technical solution, preferably, the two connecting pieces are arranged opposite to each other, an overlapping portion is provided at one end of the connecting piece, and the minimum distance from the avoidance hole to the center line of the insulating pad is greater than the distance from the edge of the overlapping portion to the center line of the insulating pad.

[0015] On the basis of the above technical solution, preferably, four avoidance holes are provided, two avoidance holes form a group, and the two groups of avoidance holes are respectively located on both sides of the center line of the insulating pad, and the overlapping portion includes a slot and two overlapping strips, the slot is located between the two overlapping strips, and the avoidance holes leak at least part of the overlapping strips along the width direction of the insulating pad.

[0016] Based on the above technical solution, preferably, the conductive terminal includes a first conductive sheet, a second conductive sheet and a connecting column, the first conductive sheet and the second conductive sheet are stacked in the connecting part, and the connecting column is detachably connected to the first conductive sheet and the second conductive sheet.

[0017] Based on the above technical solution, preferably, a first mounting hole is provided on the first conductive sheet, a second mounting hole is provided on the second conductive sheet, a third mounting hole is provided on the insulating pad, a fourth mounting hole is provided on the connecting sheet, a fifth mounting hole is provided on the connecting portion, and the connecting column passes through the first mounting hole, the second mounting hole, the third mounting hole and the fifth mounting hole in sequence and is connected to the fourth mounting hole;

[0018] The conductive terminal further includes a blocking gasket, which is sleeved on the connecting column and located in the fifth mounting hole.

[0019] On the basis of the above technical solution, preferably, the connecting portion is provided with a positioning groove, the second conductive sheet is placed in the positioning groove, the shape of the positioning groove is adapted to the second conductive sheet, and the fifth mounting hole is provided in the positioning groove.

[0020] On the basis of the above technical solution, preferably, a sealing sheet is further included, and a liquid injection hole is provided on the top cover, and the sealing sheet is used for sealing and welding with the liquid injection hole.

[0021] On the basis of the above technical solution, preferably, an explosion-proof valve is provided on the top cover, and a pressure relief hole connected to the explosion-proof valve is provided on the insulating pad.

[0022] On the basis of the above technical solution, preferably, the bottom plate is sealed and welded to the opening, and the top cover is sealed and welded to the window.

[0023] The square battery of the present invention has the following advantages over the prior art:

[0024] (1) The bottom opening of the shell is provided with a window and two connecting parts on the top surface. The conductive terminal is installed on the connecting part. The connecting piece is first connected to the conductive terminal. The positive and negative ears of the winding core are pre-welded, passed through the window and then welded to the connecting piece. After welding, there is no need to bend the ears. Finally, the bottom plate and the opening are welded and sealed. The top cover and the window are welded and sealed. The insulating pad is located between the top surface and the connecting piece. The insulating pad does not need to be used to press the winding core. The insulating pad can be made thin and no space for bending the ears is required. The volume of the shell can be maximized. The winding core can be made relatively higher, thereby improving the energy density of the battery.

[0025] (2) An avoidance hole is provided on the insulating pad, and the avoidance hole is used for the positive electrode ear and the negative electrode ear to pass through, so that the positive electrode ear and the negative electrode ear can pass through the window and then be welded to the connecting piece. After welding, there is no need to bend the electrode ear again, and no space for bending the electrode ear is required, thereby improving the reliability of the device;

[0026] (3) The two connecting pieces are arranged relative to each other, and an overlap portion is provided at one end of the connecting piece. The minimum distance from the avoidance hole to the center line of the insulating pad is greater than the distance from the edge of the overlap portion to the center line of the insulating pad, ensuring that the insulating pad can cover the edge of the overlap portion, avoiding the overlap portion from bending out of the avoidance hole and causing a short circuit at the edge of the overlap portion, thereby improving the reliability and stability of the device;

[0027] (4) There are four avoidance holes, two avoidance holes form a group, and the two groups of avoidance holes are respectively located on both sides of the center line of the insulating pad. The overlapping portion includes a slot and two overlapping strips. The slot is located between the two overlapping strips. The avoidance holes at least partially leak out the overlapping strips along the width direction of the insulating pad, making it easier for the positive and negative tabs to pass through the avoidance holes, thereby improving the reliability of the device;

[0028] (5) The conductive terminal includes a first conductive sheet, a second conductive sheet, and a connecting column. The first conductive sheet and the second conductive sheet are stacked in the connecting portion. The connecting column is detachably connected to the first conductive sheet and the second conductive sheet. The connecting column penetrates from the bottom of the top surface of the shell and is connected to the first conductive sheet and the second conductive sheet, thereby realizing installation and connection fixation of the conductive terminal at the connecting portion, facilitating installation and disassembly, and improving the convenience of assembly and maintenance.

[0029] (6) A fifth mounting hole is provided through the connecting portion, and the barrier gasket is sleeved on the connecting column and located in the fifth mounting hole, thereby achieving insulation between the connecting column and the shell, preventing the shell from being charged, and improving the reliability and safety of the square battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1 A three-dimensional diagram of a square battery of the present invention;

[0032] Figure 2 This is an exploded view of the square battery of the present invention;

[0033] Figure 3 This is a cross-sectional view of a square battery of the present invention;

[0034] Figure 4 For the utility model Figure 3 A partial enlarged view of part A in the middle;

[0035] Figure 5 This is a three-dimensional diagram of the housing of the present invention from a top perspective;

[0036] Figure 6 This is a three-dimensional diagram of the housing of the present invention from a bottom perspective;

[0037] Figure 7 A three-dimensional diagram of the top cover of the present invention;

[0038] Figure 8 A three-dimensional diagram of the insulating pad of the present invention;

[0039] Figure 9 A three-dimensional diagram of the connecting piece of the present invention;

[0040] Figure 10 It is a three-dimensional diagram of the conductive terminal of the present invention.

[0041] Description of reference numerals: 1-housing, 2-bottom plate, 3-top cover, 4-winding core, 5-insulating pad, 6-connecting piece, 7-conductive terminal, 8-sealing piece;

[0042] 11-opening, 12-window, 13-connecting portion, 131-fifth mounting hole, 132-positioning slot;

[0043] 31-liquid injection hole, 32-explosion-proof valve;

[0044] 51-avoidance hole, 52-third mounting hole, 53-pressure relief hole;

[0045] 61- overlapping portion, 611- overlapping strip, 612- slot, 62- fourth mounting hole;

[0046] 71 - first conductive sheet, 711 - first mounting hole, 72 - second conductive sheet, 721 - second mounting hole, 73 - connecting column, 74 - blocking gasket. DETAILED DESCRIPTION

[0047] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0048] Reference Figures 1-10 As shown, an embodiment of the present invention provides a square battery, including a shell 1, a bottom plate 2, a top cover 3, a winding core 4, an insulating pad 5, two connecting pieces 6 and two conductive terminals 7, wherein:

[0049] The bottom of the housing 1 is provided with an opening 11, and the top surface is provided with a window 12 and two connecting parts 13. The two connecting parts 13 are respectively located on both sides of the window 12. The window 12 is located in the center of the top surface of the housing 1.

[0050] The bottom plate 2 is used to connect with the opening 11;

[0051] The top cover 3 is used to connect with the window 12;

[0052] The two connecting pieces 6 are respectively connected to the positive electrode tab and the negative electrode tab of the winding core 4 and are both located in the housing 1;

[0053] The conductive terminal 7 is mounted on the connecting portion 13 and connected to the connecting piece 6;

[0054] The insulating pad 5 is located between the top surface and the connecting piece 6 .

[0055] The square battery provided in this embodiment has an opening 11 at the bottom of the shell 1, and a window 12 and two connecting parts 13 are provided on the top surface. The conductive terminal 7 is installed on the connecting part 13, and the connecting piece 6 is first connected to the conductive terminal 7. The positive and negative ears of the winding core 4 are pre-welded, passed through the window 12, and then welded to the connecting piece 6. After welding, there is no need to bend the ears. Finally, the bottom plate 2 and the opening 11 are welded and sealed, and the top cover 3 and the window 12 are welded and sealed. The insulating pad 5 is located between the top surface and the connecting piece 6. The insulating pad 5 does not need to be used to press the winding core 4. The insulating pad 5 can be made thin and there is no need to provide a bending space for the ears. The volume of the shell 1 can be maximized, and the winding core 4 can be made relatively higher to improve the energy density of the battery.

[0056] In some embodiments, the insulating pad 5 is provided with a relief hole 51 for the positive and negative tabs to pass through. By providing the relief hole 51 on the insulating pad 5 for the positive and negative tabs to pass through, the positive and negative tabs can pass through the window 12 and then be welded to the connecting piece 6. After welding, there is no need to bend the tabs again, and no space is required for bending the tabs, thereby improving the reliability of the device.

[0057] In some embodiments, the two connecting pieces 6 are disposed opposite each other, and an overlap portion 61 is disposed at one end of the connecting piece 6. The minimum distance from the avoidance hole 51 to the centerline of the insulating pad 5 is greater than the distance from the edge of the overlap portion 61 to the centerline of the insulating pad 5. The minimum distance from the avoidance hole 51 to the centerline of the insulating pad 5 is greater than the distance from the edge of the overlap portion 61 to the centerline of the insulating pad 5. The avoidance hole 51 does not allow the overlap portion 61 to leak out along the length of the insulating pad 5, ensuring that the insulating pad 5 can cover the edge of the overlap portion 61, preventing the overlap portion 61 from bending out of the avoidance hole 51 and causing a short circuit at the edge of the overlap portion 61, thereby improving the reliability and stability of the device.

[0058] In some embodiments, four avoidance holes 51 are provided, with two avoidance holes 51 forming a group. The two groups of avoidance holes 51 are respectively located on both sides of the centerline of the insulating pad 5. The overlapping portion 61 includes a slot 612 and two overlapping strips 611. The two overlapping strips 611 are provided on both sides along the width direction of the connecting piece 6. The slot 612 is located between the two overlapping strips 611. The avoidance holes 51 at least partially protrude from the overlapping strips 611 along the width direction of the insulating pad 5. Since the slot 612 is located between the two overlapping strips 611, the avoidance holes 51 at least partially protrude from the overlapping strips 611 along the width direction of the insulating pad 5, making it easier for the positive and negative tabs to pass through the avoidance holes 51, thereby improving the reliability of the device.

[0059] In some embodiments, the conductive terminal 7 includes a first conductive sheet 71, a second conductive sheet 72, and a connecting post 73. The first conductive sheet 71 and the second conductive sheet 72 are stacked in the connecting portion 13, and the connecting post 73 is detachably connected to the first conductive sheet 71 and the second conductive sheet 72. The connecting post 73 penetrates from the bottom of the top surface of the housing 1 and connects with the first conductive sheet 71 and the second conductive sheet 72, thereby achieving installation and connection fixation of the conductive terminal 7 at the connecting portion 13, facilitating installation and removal, and improving the convenience of assembly and maintenance.

[0060] In some embodiments, a first mounting hole 711 is provided on the first conductive sheet 71, a second mounting hole 721 is provided on the second conductive sheet 72, a third mounting hole 52 is provided on the insulating pad 5, a fourth mounting hole 62 is provided on the connecting sheet 6, and a fifth mounting hole 131 is provided on the connecting portion 13. The connecting column 73 passes through the first mounting hole 711, the second mounting hole 721, the third mounting hole 52 and the fifth mounting hole 131 in sequence and is connected to the fourth mounting hole 62; the conductive terminal 7 also includes a blocking gasket 74, which is sleeved on the connecting column 73 and located in the fifth mounting hole 131. The connecting column 73 passes through the first mounting hole 711, the second mounting hole 721, the third mounting hole 52 and the fifth mounting hole 131 in sequence and is connected to the fourth mounting hole 62, so as to realize the installation, connection and fixation of the first conductive sheet 71, the second conductive sheet 72 and the connecting part 13; the blocking gasket 74 is made of insulating material, is sleeved on the connecting column 73, and is located in the fifth mounting hole 131, so as to realize insulation between the connecting column 73 and the shell 1, avoid the shell 1 from being charged, and improve the reliability and safety of the square battery.

[0061] In some embodiments, the connecting portion 13 is provided with a positioning groove 132, and the second conductive sheet 72 is placed in the positioning groove 132. The shape of the positioning groove 132 is adapted to the second conductive sheet 72, and the fifth mounting hole 131 is provided in the positioning groove 132. Since the shape of the positioning groove 132 is adapted to the second conductive sheet 72 and the second conductive sheet 72 is placed in the positioning groove 132, the installation and placement of the second conductive sheet 72 and the connecting portion 13 are facilitated. After the connection is completed, the second conductive sheet 72 will not rotate, thereby improving the stability and reliability of the square battery.

[0062] In some embodiments, the prismatic battery further includes a sealing sheet 8. The top cover 3 is provided with a liquid injection hole 31. The sealing sheet 8 is used to be sealed and welded to the liquid injection hole 31. By providing the liquid injection hole 31 on the top cover 3, after liquid injection is completed, the sealing sheet 8 is finally sealed and welded to the liquid injection hole 31 to achieve a seal at the liquid injection hole 31, thereby preventing leakage and improving the reliability of the prismatic battery.

[0063] In some embodiments, the top cover 3 is provided with an explosion-proof valve 32, and the insulating pad 5 is provided with a pressure relief hole 53 connected to the explosion-proof valve 32. Through the pressure relief hole 53 provided on the insulating pad 5 and connected to the explosion-proof valve 32, when the pressure exceeds a preset threshold, the explosion-proof valve 32 opens, preventing safety risks caused by excessive battery pressure, thereby improving the safety of the prismatic battery.

[0064] In some embodiments, the bottom plate 2 is seal-welded to the opening 11, and the top cover 3 is seal-welded to the window 12. After the positive and negative tabs are welded to the connecting tab 6, the bottom plate 2 is seal-welded to the opening 11, and the top cover 3 is seal-welded to the window 12, completing the assembly of the prismatic battery.

[0065] The working principle of the square battery is as follows: the conductive terminal 7 is installed on the connecting part 13, the two connecting pieces 6 are respectively welded to the two conductive terminals 7 first, the positive ear and the negative ear of the winding core 4 are pre-welded first, passed through the window 12 and then welded to the two connecting pieces 6 respectively, and there is no need to bend the ears after welding. Finally, the bottom plate 2 and the opening 11 are welded and sealed, and the top cover 3 and the window 12 are welded and sealed. The insulating pad 5 is located between the top surface and the connecting piece 6. The insulating pad 5 does not need to be used to press the winding core 4. The insulating pad 5 can be made thin, and there is no need to provide a bending space for the ears. The volume of the shell 1 can be utilized to the greatest extent, and the winding core 4 can be made relatively higher to improve the energy density of the battery.

[0066] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A square battery, characterized in that: It comprises a housing (1), a bottom plate (2), a top cover (3), a winding core (4), an insulating pad (5), two connecting pieces (6) and two conductive terminals (7), wherein: The bottom of the housing (1) is provided with an opening (11), and the top surface is provided with a window (12) and two connecting parts (13), and the two connecting parts (13) are respectively located on both sides of the window (12); The bottom plate (2) is used to connect with the opening (11); The top cover (3) is used to connect with the window (12); The two connecting pieces (6) are respectively connected to the positive electrode tab and the negative electrode tab of the winding core (4), and are both located inside the housing (1); The conductive terminal (7) is mounted on the connecting portion (13) and connected to the connecting piece (6); The insulating pad (5) is located between the top surface and the connecting piece (6).

2. The square battery according to claim 1, wherein: The insulating pad (5) is provided with an escape hole (51), and the escape hole (51) is used for allowing the positive electrode tab and the negative electrode tab to pass through.

3. The square battery according to claim 2, wherein: The two connecting pieces (6) are arranged opposite to each other, and one end of the connecting piece (6) is provided with an overlapping portion (61), and the minimum distance from the avoidance hole (51) to the center line of the insulating pad (5) is greater than the distance from the edge of the overlapping portion (61) to the center line of the insulating pad (5).

4. The square battery according to claim 3, wherein: Four avoidance holes (51) are provided, two avoidance holes (51) form a group, and the two groups of avoidance holes (51) are respectively located on both sides of the center line of the insulating pad (5); the overlapping portion (61) includes a slot (612) and two overlapping strips (611); the slot (612) is located between the two overlapping strips (611); and the avoidance holes (51) at least partially leak out of the overlapping strips (611) along the width direction of the insulating pad (5).

5. The square battery according to claim 1, wherein: The conductive terminal (7) comprises a first conductive sheet (71), a second conductive sheet (72) and a connecting column (73), wherein the first conductive sheet (71) and the second conductive sheet (72) are stacked in the connecting portion (13), and the connecting column (73) is detachably connected to the first conductive sheet (71) and the second conductive sheet (72).

6. The square battery according to claim 5, characterized in that The first conductive sheet (71) is provided with a first mounting hole (711), the second conductive sheet (72) is provided with a second mounting hole (721), the insulating pad (5) is provided with a third mounting hole (52), the connecting sheet (6) is provided with a fourth mounting hole (62), the connecting portion (13) is provided with a fifth mounting hole (131), and the connecting column (73) passes through the first mounting hole (711), the second mounting hole (721), the third mounting hole (52) and the fifth mounting hole (131) in sequence and is connected to the fourth mounting hole (62); The conductive terminal (7) further includes a blocking gasket (74), which is sleeved on the connecting column (73) and located in the fifth mounting hole (131).

7. The square battery according to claim 6, wherein: The connecting portion (13) is provided with a positioning groove (132), the second conductive sheet (72) is placed in the positioning groove (132), the shape of the positioning groove (132) is adapted to the second conductive sheet (72), and the fifth mounting hole (131) is provided in the positioning groove (132).

8. The square battery according to claim 1, wherein: It also includes a sealing sheet (8), a liquid injection hole (31) is provided on the top cover (3), and the sealing sheet (8) is used for sealing and welding with the liquid injection hole (31).

9. The square battery according to claim 1, wherein: An explosion-proof valve (32) is provided on the top cover (3), and a pressure relief hole (53) communicating with the explosion-proof valve (32) is provided on the insulating pad (5).

10. The square battery according to any one of claims 1 to 9, characterized in that: The bottom plate (2) is sealed and welded to the opening (11), and the top cover (3) is sealed and welded to the window (12).

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