Square battery cell

Abstract

The utility model provides a square battery cell which comprises a shell, a lower bracket, an upper bracket, a roll core group, a cover plate, at least two pole column assemblies and a connecting assembly, and the interior of the shell is hollow; the lower support and the upper support are both arranged in the shell, the upper support abuts against the lower support, a containing cavity is formed between the lower support and the upper support, the lower support and the upper support are insulated from the shell, and the roll core set is inserted into the containing cavity. The cover plate is arranged on the opening side of the shell; the at least two pole assemblies are arranged on one side, far away from the lower bracket, of the upper bracket, and one end, far away from the upper bracket, of each pole assembly penetrates through and extends to the outer side of the cover plate; the connecting assemblies are arranged between the corresponding pole assemblies and the tabs of the roll core groups and are used for conducting the output current of the roll core groups to the pole columns, the roll cores are wrapped by the lower bracket and the upper bracket, so that the roll cores are insulated from the shell, and the roll cores are positioned by adopting split connection, so that the assembly of the battery core is facilitated, and the production efficiency is improved. Therefore, the production efficiency and the safety performance of the battery cell are improved.

Description

Technical Field

[0001] This utility model relates to the field of square battery cell technology, and in particular to a square battery cell. Background Technology

[0002] Currently, battery cells typically have two structures: laminated and wound. They consist of single-wound, double-wound, and quadruple-wound cells. Conventional energy storage cells usually consist of a casing, base plate, mylar, wound core, connecting plate, top cover, tape, electrolyte, etc.

[0003] A novel square battery structure, disclosed in CN211045606U, includes a square aluminum shell and a pouch battery. The square aluminum shell comprises a cover plate and a housing, which are fixedly connected. The pouch battery is disposed inside the aluminum shell. The cover plate is provided with a positive metal terminal and a negative metal terminal. The positive metal terminal is electrically connected to the positive terminal of the pouch battery, and the negative metal terminal is electrically connected to the negative terminal of the pouch battery. Currently, existing square batteries have numerous structural components, which are inconvenient for assembly and reduce production efficiency. At the same time, the internal insulation of the battery is poor, which reduces the safety performance of the cell. Utility Model Content

[0004] In view of this, the present invention proposes a square battery cell, in which the core is wrapped by a lower bracket and an upper bracket, thereby insulating the core from the shell. Furthermore, the lower bracket and the upper bracket are connected separately to limit the position of the core, which facilitates the assembly of the battery cell and thus improves production efficiency and the safety performance of the battery cell.

[0005] The technical solution of this utility model is achieved as follows: This utility model provides a square battery cell, including a housing, a lower support, an upper support, a core assembly, a cover plate, at least two electrode assemblies, and a connecting assembly, wherein...

[0006] The shell is hollow inside, with one side closed and the other side having an opening;

[0007] Both the lower support and the upper support are housed inside the housing. The upper support abuts against the lower support, and a receiving cavity is formed between the lower support and the upper support. The upper support is insulated from the housing, and the core assembly is inserted into the receiving cavity.

[0008] The cover plate is located on the opening side of the housing;

[0009] At least two pole posts are located on the side of the upper bracket away from the lower bracket, and the end of the pole post assembly away from the upper bracket extends through and to the outside of the cover plate.

[0010] The connecting component is positioned between the corresponding pole assembly and the tab of the core assembly to conduct the output current of the core assembly to the pole.

[0011] On the basis of the above technical scheme, preferably, the side surface of the lower support is provided with a plurality of through holes and weight reduction holes, the through holes are arranged close to the bottom wall of the shell, the through holes are used for allowing the electrolyte to permeate and infiltrate the roll core group, and the weight reduction holes are used for reducing the weight.

[0012] On the basis of the above technical scheme, preferably, the cross-sectional dimension of the lower support matches that of the upper support, the inner walls of the lower support and the upper support are each provided with a plurality of protruding portions which are spaced apart and oppositely arranged, so as to divide the accommodating cavity into a plurality of placement areas, the roll core group comprises a plurality of roll cores, and the plurality of roll cores are respectively inserted into the corresponding placement areas.

[0013] On the basis of the above technical scheme, preferably, the connecting assembly comprises a positive busbar, a negative busbar, a plurality of first busbars and a plurality of second busbars, wherein,

[0014] The positive busbar and the negative busbar are both arranged on the side of the upper support away from the lower support, and the positive busbar and the negative busbar are oppositely arranged with a spacing therebetween;

[0015] A plurality of slot holes are formed in the upper support;

[0016] One end of each of the plurality of first busbars is fixedly connected to the positive tab of the corresponding roll core, and the other end of each of the plurality of first busbars penetrates through the slot hole and is fixedly connected to the positive busbar;

[0017] One end of each of the plurality of second busbars is fixedly connected to the negative tab of the corresponding roll core, and the other end of each of the plurality of second busbars penetrates through the slot hole and is fixedly connected to the negative busbar.

[0018] On the basis of the above technical scheme, preferably, the pole assembly comprises a pole piece, a positioning frame and a pole piece, wherein,

[0019] The pole piece is fixed on the side of the corresponding positive busbar or negative busbar away from the upper support;

[0020] The positioning frame is fixed on the cover plate and is arranged in an insulating manner with the cover plate, a circular hole penetrating through the cover plate is formed in the positioning frame, and the circular hole corresponds in position to the pole piece;

[0021] The pole piece is arranged in the positioning frame, and one end of the pole piece penetrates through the circular hole and extends to be fixedly connected to the pole piece.

[0022] On the basis of the above technical scheme, preferably, the pole assembly further comprises an insulating sleeve, wherein the insulating sleeve is sleeved on the outer side of the pole piece and abuts in the circular hole, so as to insulate the pole piece from the cover plate.

[0023] On the basis of the above technical scheme, preferably, the cross-sectional shape of the positioning frame is rectangular.

[0024] On the basis of the above technical scheme, preferably, the outer side of the positive busbar and the negative busbar is provided with an insulating piece, and the insulating piece abuts against the surface of the upper support and the cover plate respectively, and the insulating piece is used for insulating the pole post assembly and the connecting assembly.

[0025] On the basis of the above technical scheme, preferably, a plurality of first air holes are formed in the upper support, the plurality of air holes are arranged on the two sides of the insulating piece, at least two second air holes are formed in the cover plate, the first air holes and the second air holes are arranged in position correspondence, and the inner side of the at least two second air holes is provided with an explosion-proof valve for opening the valve to exhaust air.

[0026] On the basis of the above technical scheme, preferably, the opening side of the shell is provided with a stepped portion, the inner contour shape of the stepped portion matches the outer contour of the cover plate, and the cover plate is fixed on the stepped portion.

[0027] The square battery of the utility model has the following beneficial effects compared with the prior art:

[0028] (1) The lower support and the upper support are arranged, the accommodating cavity in the battery is formed, the winding core group is fixed and supported, the winding core group is inserted into the accommodating cavity, the stability of the structure and the accurate positioning of the internal components of the battery are ensured, meanwhile, the lower support and the upper support are insulated from the shell, current leakage is prevented, and the safety performance of the battery is improved.

[0029] (2) The pole post assembly and the connecting assembly are arranged, the output current of the winding core group is conducted to the pole post, compared with the original battery structure, a plurality of structure parts are saved for the same capacity, the battery capacity is greatly increased, and the volume energy density of the battery is improved.

[0030] (3) The insulating piece and the insulating sleeve are arranged, the positive busbar and the negative busbar are prevented from being electrically connected or short-circuited with the upper support and the cover plate, and the safety performance is improved.

[0031] (4) The double explosion-proof valves are welded at the top, the gas generated in the battery can be quickly discharged through the opened valve, and the safety performance is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced, and obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating creative labor.

[0033] Figure 1 It is a perspective view of the square battery of the utility model;

[0034] Figure 2 This is a front view of the square battery cell of this utility model;

[0035] Figure 3 The square battery cell of this utility model Figure 2 Cross-sectional view at point AA;

[0036] Figure 4 The square battery cell of this utility model Figure 3 Enlarged view of a portion of point B in the middle;

[0037] Figure 5 This is a top view of the lower support structure of the square battery cell of this utility model;

[0038] Figure 6 This is a perspective view of the connection structure between the upper and lower frames of the square battery cell of this utility model.

[0039] Figure 7 This is an exploded view of the structure between the upper support and the cover plate of the square battery cell of this utility model. Detailed Implementation

[0040] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0041] like Figures 1-7 As shown, a square battery cell of this utility model includes a housing 1, a lower bracket 2, an upper bracket 3, a core assembly 4, a cover plate 5, at least two terminal post assemblies 6, and a connecting assembly 7.

[0042] The housing 1 is hollow inside, with one side closed and the other side open. The lower support 2 and the upper support 3 are both disposed inside the housing 1. The upper support 3 abuts against the lower support 2, and a receiving cavity 100 is formed between the lower support 2 and the upper support 3. The upper support 3 is insulated from the housing 1. The core assembly 4 is inserted into the receiving cavity 100. The cover plate 5 is disposed on the open side of the housing 1. At least two pole post assemblies 6 are disposed on the side of the upper support 3 away from the lower support 2, and the end of the pole post assembly 6 away from the upper support 3 passes through and extends to the outside of the cover plate 5. The connecting assembly 7 is disposed between the corresponding pole post assembly 6 and the pole tab of the core assembly 4, and is used to conduct the output current of the core assembly 4 to the pole post.

[0043] It should be noted that the lower support 2 and the upper support 3 are arranged to form a receiving cavity 100 in the battery cell, which is used to fix and support the winding core group 4, and the winding core group 4 is inserted into the receiving cavity 100 to ensure the stability of the structure and the accurate positioning of the components in the battery cell. Meanwhile, the lower support 2 and the upper support 3 are arranged to be insulated from the shell 1 to prevent current leakage and improve the safety performance of the battery cell.

[0044] The lower support 2 in the embodiment is provided with a plurality of through holes 200 and weight-reducing holes 210 on the side surface. The through holes 200 are arranged close to the bottom wall of the shell 1 and are used to allow the electrolyte to permeate and infiltrate the winding core group 4. The weight-reducing holes 210 are used to reduce the weight.

[0045] It should be noted that the lower support 2 is provided with four equidistant through holes 200 on both sides, which is beneficial to the electrolyte to permeate faster into each part of the winding core group 4, thereby improving the infiltration efficiency and uniformity. The weight-reducing holes 210 are used to reduce the weight to improve the energy efficiency of the battery cell.

[0046] The lower support 2 and the upper support 3 in the embodiment match in cross-sectional size. The inner walls of the lower support 2 and the upper support 3 are provided with a plurality of protrusions 220 arranged at intervals and oppositely, which divide the receiving cavity 100 into a plurality of placement areas. The winding core group 4 includes a plurality of winding cores 41, which are respectively inserted into the corresponding placement areas.

[0047] Specifically, the placement areas in the embodiment are provided with double winding cores 41 to avoid direct contact and mutual interference between them, thereby improving the structural stability and safety of the battery cell. Moreover, the protrusions 220 not only divide the space but also effectively position and fix the winding cores 41. During the assembly of the battery cell, the winding cores 41 can be easily inserted into the corresponding placement areas and stably supported by the protrusions 220, which simplifies the assembly process and improves the production efficiency.

[0048] The connection assembly 7 in the embodiment includes a positive bus bar 71, a negative bus bar 72, a plurality of first bus pieces 73, and a plurality of second bus pieces 74. The positive bus bar 71 and the negative bus bar 72 are arranged on the side of the upper support 3 away from the lower support 2, and the positive bus bar 71 and the negative bus bar 72 are arranged oppositely at intervals. A plurality of slot holes 300 are arranged on the upper support 3. One end of each of the plurality of first bus pieces 73 is fixedly connected with the positive electrode lug of the corresponding winding core 41, and the other end of each of the plurality of first bus pieces 73 penetrates through the slot hole 300 and is fixedly connected with the positive bus bar 71. One end of each of the plurality of second bus pieces 74 is fixedly connected with the negative electrode lug of the corresponding winding core 41, and the other end of each of the plurality of second bus pieces 74 penetrates through the slot hole 300 and is fixedly connected with the negative bus bar 72.

[0049] It should be noted that the first bus bar 73 and the second bus bar 74 are provided with two connecting ends away from one end of the positive bus bar 71 and the negative bus bar 72, and the two connecting ends are respectively welded and fixed with the same polarity of the lug of the double winding core 41, and the positive bus bar 71 and the negative bus bar 72 are formed into an integral structure with the upper support 3 through injection molding, and have good stability.

[0050] The pole column assembly 6 in the embodiment includes a pole column piece 61, a positioning frame 62 and a pole piece 63, wherein the pole column piece 61 is fixed on the side of the corresponding positive bus bar 71 or negative bus bar 72 away from the upper support 3; the positioning frame 62 is fixed on the cover plate 5 and is insulated from the cover plate 5, a circular hole 600 penetrating the cover plate 5 is formed in the positioning frame 62, and the circular hole 600 corresponds to the position of the pole column piece 61; the pole piece 63 is arranged in the positioning frame 62, and one end of the pole column piece 61 penetrates the circular hole 600 and extends to be fixedly connected with the pole piece 63.

[0051] It should be noted that when the battery pack is working, the current is transmitted to the corresponding pole column piece 61 through the positive bus bar 71 or the negative bus bar 72, the positioning frame 62 corresponding to the positive electrode is designed to be weakly conductive, and the positioning frame 62 corresponding to the negative electrode is designed to be insulated, the weakly conductive design can limit the excessive flow of current to a certain extent, thereby protecting the battery pack from damage caused by excessive current, and the weakly conductive design can also improve the energy density and power density of the battery pack, and high-rate charging and discharging is realized.

[0052] On the basis of the above technical scheme, preferably, the pole column assembly 6 further includes an insulating sleeve 64, wherein the insulating sleeve 64 is sleeved on the outside of the pole column piece 61 and abuts in the circular hole 600, for insulating the pole column piece 61 from the cover plate 5.

[0053] The cross-sectional shape of the positioning frame 62 in the embodiment is rectangular.

[0054] It should be noted that the pole piece 63 is arranged in the positioning frame 62 to enable the pole column piece 61 to realize the anti-twist function, and the size of the pole piece 63 matches that of the positioning frame 62, facilitating subsequent laser welding with the pole column, wherein the pole piece 63 of the negative electrode is formed by stamping a composite plate.

[0055] The outer side of the positive bus bar 71 and the negative bus bar 72 in the embodiment is provided with an insulating piece 8, and the insulating piece 8 abuts the surface of the upper support 3 and the cover plate 5 respectively, for insulating the pole column assembly 6 and the connecting assembly 7.

[0056] It should be noted that the middle of the cover plate 5 is provided with an upward protrusion, a gap is formed between the upper support 3 and the protrusion, the pole assembly 6 is located in the gap, and the protrusion of the cover plate 5 is tightly connected with the insulating part 8, so that the pole assembly 6 plays an insulating role, and the insulating part 8 provides an insulating protection for the positive bus bar 71 and the negative bus bar 72, and ensures that the positive bus bar 71 and the negative bus bar 72 cannot be electrically connected or short-circuited with the upper support 3 and the cover plate 5, thereby improving the safety performance.

[0057] The upper support 3 in the embodiment is provided with a plurality of first air holes 310, and the plurality of air holes 310 are arranged on the two sides of the insulating part 8, at least two second air holes 320 are arranged on the cover plate 5, the first air holes 310 and the second air holes 320 are arranged in a corresponding position, and the inner side of the at least two second air holes 320 is provided with an explosion-proof valve 9 for opening the valve to exhaust.

[0058] It should be noted that the double explosion-proof valves 9 are designed to be welded at the top, and the gas generated in the battery can be quickly discharged through the valve, thereby improving the safety performance.

[0059] The opening side of the shell 1 in the embodiment is provided with a stepped portion 110, the inner contour shape of the stepped portion 110 matches the outer contour of the cover plate 5, and the cover plate 5 is fixed on the stepped portion 100, thereby providing the overall structural stability of the battery cell.

[0060] Working principle:

[0061] After the positive and negative materials of the battery are wound into a roll core 41, the end of the roll core 41 is fixed by using glue;

[0062] The roll core 41 is welded by using ultrasonic welding technology, and the double roll cores 41 are inserted into the corresponding placement area for limiting;

[0063] The upper support 3 is installed on the lower support 2, and it is ensured that the pole lug of each roll core 41 can pass through the corresponding slot hole 300 of the upper support 3, and the support provided with the roll core 41 is placed in the shell 1;

[0064] The pole lug passing through the upper support 3 is connected with the corresponding positive bus bar 71 and negative bus bar 72 by using laser welding technology, and the positive bus bar 71 and the negative bus bar 72 are responsible for collecting the current from each roll core 41 and transmitting the current to the pole assembly 6.

[0065] The above only describes the preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A square-shaped battery cell, characterized in that, The application relates to a battery, which comprises a shell (1), a lower support (2), an upper support (3), a winding core group (4), a cover plate (5), at least two pole column assemblies (6) and a connecting assembly (7), wherein, The shell (1) is hollow inside and is closed on one side and provided with an opening on the other side; The lower support (2) and the upper support (3) are arranged in the shell (1), the upper support (3) abuts against the lower support (2), a containing cavity (100) is formed between the lower support (2) and the upper support (3), and the lower support (2) and the upper support (3) are arranged in an insulating mode with the shell (1), and the winding core group (4) is inserted into the containing cavity (100); The cover plate (5) is arranged on the opening side of the shell (1); The at least two pole column assemblies (6) are arranged on the side, away from the lower support (2), of the upper support (3), and the end, away from the upper support (3), of the pole column assembly (6) penetrates through and extends to the outside of the cover plate (5); The connecting assembly (7) is arranged between the corresponding pole column assembly (6) and the tab of the winding core group (4), and is used for conducting the output current of the winding core group (4) to the pole column.

2. The square prismatic cell of claim 1, wherein: A plurality of through holes (200) and weight-reducing holes (210) are formed in the side of the lower support (2), the through holes (200) are arranged close to the bottom wall of the shell (1), the through holes (200) are used for allowing the electrolyte to permeate and infiltrate the winding core group (4), and the weight-reducing holes (210) are used for reducing the weight.

3. The square prismatic cell of claim 1, wherein: The cross-sectional dimension of the lower support (2) matches that of the upper support (3), the inner walls of the lower support (2) and the upper support (3) are each provided with a plurality of spaced and oppositely arranged protruding portions (220), the containing cavity (100) is divided into a plurality of placement areas, the winding core group (4) comprises a plurality of winding cores (41), and the plurality of winding cores (41) are respectively inserted into the corresponding placement areas.

4. The square prismatic cell of claim 3, wherein: The connecting assembly (7) comprises a positive busbar (71), a negative busbar (72), a plurality of first busbars (73) and a plurality of second busbars (74), wherein, The positive busbar (71) and the negative busbar (72) are arranged on the side, away from the lower support (2), of the upper support (3), and the positive busbar (71) and the negative busbar (72) are arranged in a spaced and opposite mode; A plurality of slot holes (300) are formed in the upper support (3); One end of each of the plurality of first busbars (73) is fixedly connected with the positive tab of the corresponding winding core (41), and the other end of each of the plurality of first busbars (73) penetrates through the slot hole (300) and is fixedly connected with the positive busbar (71); One end of each of the plurality of second busbars (74) is fixedly connected with the negative tab of the corresponding winding core (41), and the other end of each of the plurality of second busbars (74) penetrates through the slot hole (300) and is fixedly connected with the negative busbar (72).

5. The square prismatic cell of claim 4, wherein: The pole column assembly (6) comprises a pole column piece (61), a positioning frame (62) and a pole piece (63), wherein, The pole column piece (61) is fixed on the side, away from the upper support (3), of the corresponding positive busbar (71) or negative busbar (72); The positioning frame (62) is fixed on the cover plate (5) and is insulated from the cover plate (5), a circular hole (600) penetrating the cover plate (5) is formed in the positioning frame (62), and the circular hole (600) corresponds to the position of the pole piece (61); The pole piece (63) is arranged in the positioning frame (62), and one end of the pole piece (61) penetrates the circular hole (600) and extends to be fixedly connected with the pole piece (63).

6. The square prismatic cell of claim 5, wherein: The pole assembly (6) further comprises an insulating sleeve (64), wherein the insulating sleeve (64) is sleeved on the outer side of the pole piece (61) and abuts in the circular hole (600), so as to insulate the pole piece (61) from the cover plate (5).

7. The square prismatic cell of claim 5, wherein: The cross-sectional shape of the positioning frame (62) is rectangular.

8. The square prismatic cell of claim 4, wherein: The outer sides of the positive bus bar (71) and the negative bus bar (72) are provided with insulating pieces (8), and the insulating pieces (8) abut the surfaces of the upper support (3) and the cover plate (5) respectively, so as to insulate the pole assembly (6) and the connecting assembly (7).

9. The square cell of claim 8, wherein: A plurality of first air holes (310) are formed in the upper support (3), the plurality of air holes (310) are arranged on the two sides of the insulating piece (8), at least two second air holes (320) are formed in the cover plate (5), the first air holes (310) and the second air holes (320) are arranged in a corresponding position, and the inner sides of the at least two second air holes (320) are provided with explosion-proof valves (9) for opening valve exhaust.

10. The square prismatic cell of claim 1, wherein: The opening side of the shell (1) is provided with a stepped portion (110), the inner contour shape of the stepped portion (110) matches the outer contour of the cover plate (5), and the cover plate (5) is fixed on the stepped portion (110).

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