Lithium battery with high space utilization rate

Abstract

The utility model relates to the technical field of batteries, in particular to a lithium battery with high space utilization rate, which comprises a shell, a cover plate, a pole, a roll core and a connecting piece, the roll core and the connecting piece are mounted in the shell, the cover plate covers an opening of the shell, and the connecting piece is arranged between the roll core and the cover plate; the pole is mounted in the through hole of the cover plate, and a mounting through hole is formed in the pole; one part of the structure of the connecting piece is inserted into the mounting through hole and is welded with the pole, and the other part of the structure of the connecting piece extends to the outer part of the mounting through hole, abuts against the side part of the tab cluster of the roll core and is welded with the tab cluster. The structure of the connecting piece is redesigned, one part of the structure of the connecting piece abuts against the side part of the tab cluster and is welded with the tab cluster, and the other part of the structure of the connecting piece is inserted into the mounting through hole of the pole and is welded with the pole, so that the space occupied by the connecting piece in the height direction is reduced, and the space of the roll core is further increased; and the capacity of the battery is greatly improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a lithium battery with high space utilization. Background Art

[0002] At present, lithium batteries are increasingly used in large-scale energy storage fields, and the capacity of lithium batteries is getting larger and larger. In order to meet market demand and reduce battery costs, maximizing capacity within a limited space volume has become the anchoring goal of R&D personnel. However, in order to facilitate assembly, the connecting piece is often designed as a long sheet structure, which is folded during the installation process and finally pressed between the cover plate and the winding core in a folded shape. The connecting piece of this structure occupies a large space, which in turn compresses the space of the winding core, which is not conducive to achieving the goal of large capacity of the battery. Utility Model Content

[0003] The purpose of the present application is to provide a lithium battery with high space utilization, which to a certain extent solves the technical problem that the connecting piece in the lithium battery in the prior art is designed as a long sheet structure, which is folded during the installation process and finally pressed between the cover plate and the winding core in a folded shape, and the connecting piece occupies a large space, compresses the space of the winding core, and is not conducive to achieving the goal of large capacity of the battery.

[0004] The present application provides a lithium battery with high space utilization, comprising: a shell, a cover plate, a pole, a winding core and a connecting piece; wherein the winding core and the connecting piece are both installed in the shell, the cover plate is sealed at the opening of the shell, and the connecting piece is arranged between the winding core and the cover plate;

[0005] The pole is installed in the through hole of the cover plate, and the pole is formed with a mounting through hole; a part of the structure of the connecting piece is inserted in the mounting through hole and is connected to the pole by welding, and another part of the structure of the connecting piece extends to the outside of the mounting through hole and abuts against the side of the pole ear cluster of the winding core, and is connected to the pole ear cluster by welding.

[0006] In the above technical solution, further, the mounting through hole and the connecting piece are both U-shaped, and the two are adapted to each other;

[0007] There are two winding cores, and the tab clusters of the two winding cores are respectively against the two outer sides of the U-shaped connecting piece and are respectively connected by welding.

[0008] In any of the above technical solutions, further, a notch is formed at one end of the connecting piece opposite to its open end.

[0009] In any of the above technical solutions, further, the connecting piece is not exposed on the outer end surface of the pole along the height direction thereof.

[0010] In any of the above technical solutions, further, the cover plate includes a plain aluminum plate and a lower plastic; wherein the lower plastic is installed on a side of the plain aluminum plate close to the winding core.

[0011] In any of the above technical solutions, further, the bare aluminum plate is formed with a through main explosion-proof hole and an auxiliary explosion-proof hole arranged at intervals, and the auxiliary explosion-proof hole is arranged on the side of the main explosion-proof hole;

[0012] The lithium battery with high space utilization also includes an explosion-proof plate, and the explosion-proof plate is installed in one end of the main explosion-proof hole and the auxiliary explosion-proof hole close to the winding core.

[0013] In any of the above technical solutions, further, the lower plastic is provided with a through main exhaust hole and an auxiliary exhaust hole, and the main exhaust hole corresponds to and is connected to the main explosion-proof hole, and the auxiliary exhaust hole corresponds to and is connected to the auxiliary explosion-proof hole.

[0014] In any of the above technical solutions, further, the bare aluminum plate is provided with a first liquid injection hole, the lower plastic is provided with a second liquid injection hole, and the second liquid injection hole corresponds to and is connected with the first liquid injection hole.

[0015] In any of the above technical solutions, further, the number of the first liquid injection holes and the second liquid injection holes are both multiple and correspond one to one.

[0016] In any of the above technical solutions, further, along the length direction of the plain aluminum plate, the two first liquid injection holes are respectively arranged on both sides of the plain aluminum plate;

[0017] Along the length direction of the lower plastic, the two second liquid injection holes are respectively arranged on two sides of the lower plastic.

[0018] In any of the above technical solutions, further, the square shell lithium battery with high space utilization also includes a welding fixing ring and an upper plastic; wherein the welding fixing ring is sleeved on the outside of one end of the pole exposed to the cover plate assembly; the upper plastic extends along the outer circumference of the welding fixing ring and wraps the outer wall of the welding fixing ring to separate the welding fixing ring from the bare aluminum plate, and the upper plastic is formed on the welding fixing ring and the bare aluminum plate by injection molding.

[0019] Compared with the prior art, the beneficial effects of this application are:

[0020] The present application provides a lithium battery with high space utilization. The structure of the connecting plate is redesigned so that a part of the connecting plate is against the side of the pole lug cluster and welded to the pole lug cluster, and another part of the connecting plate is inserted into the mounting through hole of the pole and welded to the pole. It can be seen that compared with the folded connecting plate in the prior art, the space occupied by the connecting plate in the height direction is greatly reduced, thereby increasing the space of the winding core and greatly increasing the capacity of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 An exploded diagram of a lithium battery with high space utilization provided by an embodiment of the present application;

[0023] Figure 2 An assembly diagram of a lithium battery with high space utilization provided by an embodiment of the present application;

[0024] Figure 3 A cross-sectional view of a lithium battery with high space utilization provided by an embodiment of the present application;

[0025] Figure 4 for Figure 3 A schematic diagram of a local enlarged structure;

[0026] Figure 5 A schematic diagram of the structure of a pole provided in an embodiment of the present application;

[0027] Figure 6 A schematic diagram of the structure of the connecting piece provided in the embodiment of the present application;

[0028] Figure 7 A partial exploded view of the cover plate provided in an embodiment of the present application.

[0029] Reference numerals:

[0030] 1-shell, 2-cover plate, 21-plain aluminum plate, 211-main explosion-proof hole, 212-auxiliary explosion-proof hole, 213-first liquid injection hole, 22-lower plastic, 221-main exhaust hole, 222-auxiliary exhaust hole, 223-second liquid injection hole, 3-pole, 31-mounting through hole, 4-winding core, 41-pole ear cluster, 5-connecting piece, 51-notch, 6-explosion-proof piece, 7-upper plastic, 8-welding fixing ring, 9-sealing ring. DETAILED DESCRIPTION

[0031] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0032] The components of the embodiments of the present application generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed, but merely represents the selected embodiments of the present application.

[0033] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0034] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0035] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] Refer to the following Figures 1 to 7 A lithium battery with high space utilization according to some embodiments of the present application is described.

[0037] See also Figures 1 to 6 As shown, an embodiment of the present application provides a lithium battery with high space utilization, comprising: a shell 1, a cover plate 2, a pole 3, a winding core 4 and a connecting piece 5; wherein the winding core 4 and the connecting piece 5 are both installed in the shell 1, the cover plate 2 is sealed at the opening of the shell 1, and the connecting piece 5 is arranged between the winding core 4 and the cover plate 2;

[0038] The pole 3 is installed in the through hole of the cover plate 2, and the pole 3 is formed with a mounting through hole 31; a part of the structure of the connecting piece 5 is inserted in the mounting through hole 31 and is connected to the pole 3 by welding, and another part of the structure of the connecting piece 5 extends to the outside of the mounting through hole 31 and abuts against the side of the pole ear cluster 41 of the winding core 4, and is connected to the pole ear cluster 41 by welding.

[0039] According to the structure described above, the present application provides a lithium battery with high space utilization, and the structure of the connecting plate 5 is redesigned. A part of the structure of the connecting plate 5 is against the side of the pole ear cluster 41 and is welded to the pole ear cluster 41, and another part of the structure of the connecting plate 5 is inserted into the mounting through hole 31 of the pole 3 and is welded to the pole 3. It can be seen that compared with the folded connecting plate in the prior art, the space occupied by the connecting plate in the height direction is greatly reduced, thereby increasing the space of the winding core, and greatly increasing the capacity of the battery.

[0040] Further, preferably, the height direction of the connecting piece 5 is the same as the height direction of the winding core 4, and along the height direction of the connecting piece 5, a part of the structure of the connecting piece 5 is inserted into the mounting through hole 31 and connected to the pole 3 by welding, and another part of the structure of the connecting piece 5 extends to the outside of the mounting through hole 31 and abuts against the side of the pole ear cluster 41 of the winding core 4. Of course, not limited to this, the height direction of the connecting piece 5 can also form an angle with the height direction of the winding core 4, that is, the connecting piece 5 is inclined relative to the winding core 4, but the inclination angle is not easy to be too large.

[0041] In this embodiment, preferably, Figure 5 and Figure 6 As shown, the mounting through hole 31 and the connecting piece 5 are both U-shaped, and the two are adapted to each other;

[0042] There are two winding cores 4 , and the tab clusters 41 of the two winding cores 4 are respectively against the two outer sides of the U-shaped connecting piece 5 , and are respectively connected by welding.

[0043] According to the structure described above, the U-shaped connecting piece 5 can ensure the connection with the pole ear clusters 41 of the two winding cores 4 at the same time, and makes the overall strength of the connecting piece 5 high and not easy to be damaged or deformed, thereby ensuring the stability and firmness of the connection with the pole ear clusters 41 of the winding core 4 and the pole 3.

[0044] It should be noted that: when the number of winding cores 4 is more than two, the width of the U-shaped connecting piece 5 can be increased, and multiple adapter plates can be arranged in the cavity of the U-shaped connecting piece 5, so that the sum of the adapter plates and the two side portions of the U-shaped connecting piece 5 is equal to the number of winding cores 4, and corresponds one to one to form a new connecting piece 5 structure, and when the structure of the connecting piece 5 changes, the shape of the mounting through hole 31 on the pole 3 changes accordingly, and is adapted to the aforementioned new connecting piece 5.

[0045] In addition, the structure of the connecting piece 5 is not limited to the above. The connecting piece 5 can also be a straight-line structure, which can be selected according to actual needs. Especially when the number of winding cores 4 is multiple, the same number of connecting pieces 5 can be provided, and they correspond one to one. Then, correspondingly, the mounting through holes 31 on the connecting piece 5 are also in a corresponding straight-line shape. Especially when the number of winding cores 4 is multiple, the number of mounting through holes 31 on the pole 3 is multiple, and they correspond one to one with the multiple winding cores 4.

[0046] In this embodiment, preferably, Figure 6 As shown, a notch 51 is formed at one end of the connecting piece 5 opposite to the open end thereof.

[0047] According to the structure described above, the connecting piece 5 can be made by bending, so a notch 51 is designed at this position to make the connecting piece 5 easy to bend and form, that is, finally bend into a U-shaped structure.

[0048] In this embodiment, preferably, Figure 4 As shown, the connecting piece 5 is flush with the top end of the pole 3 .

[0049] According to the structure described above, the connecting piece 5 is flush with the top of the pole 3 to ensure that the connecting piece 5 does not extend outward, thereby avoiding interference with other components or electrical connection problems, which helps to improve the safety and reliability of the lithium battery. The connecting piece 5 and the pole 3 can be welded outside the pole 3, which improves the convenience of operation and avoids the welding slag generated during the welding process from falling into the inside of the battery.

[0050] It should be noted that: not limited to the above-mentioned structure in which the connecting piece 5 is flush with the top of the pole 3, the connecting piece 5 can also be lower than the top of the pole 3, that is, as long as the connecting piece 5 is not exposed on the outer end surface of the pole 3 along its height direction, the specific design can be based on actual needs.

[0051] In this embodiment, preferably, the tab cluster 41 of the winding core 4 is in a flattened state, and another portion of the structure of the connecting piece 5 extends to the outside of the mounting through hole 31 and abuts against the side of the tab cluster 41 after being flattened. The tab cluster 41 is flattened to protect the tabs and helps to reduce the height of the tab cluster 41, thereby increasing the space of the winding core 4. Of course, it is not limited to this, and the tab cluster 41 may also be selected not to be flattened according to actual needs. The specific selection is based on actual needs.

[0052] In this embodiment, preferably, Figure 7 As shown, the cover plate 2 includes a plain aluminum plate 21 and a lower plastic 22 ; wherein the lower plastic 22 is installed on a side of the plain aluminum plate 21 close to the winding core 4 .

[0053] According to the structure described above, the lower plastic 22 is installed on the side of the bare aluminum plate 21 close to the winding core 4 to play a role of insulation protection.

[0054] In this embodiment, preferably, Figure 7 As shown, the bare aluminum plate 21 is formed with a main explosion-proof hole 211 and an auxiliary explosion-proof hole 212 which are arranged at intervals, and the auxiliary explosion-proof hole 212 is arranged on the side of the main explosion-proof hole 211 .

[0055] According to the structure described above, the auxiliary explosion-proof hole 212 is designed on the side of the main explosion-proof hole 211. When the main explosion-proof hole 211 is blocked, the auxiliary explosion-proof hole 212 can still be used to release pressure, thereby ensuring the safety and reliability of the lithium battery during use.

[0056] In this embodiment, preferably, Figure 7 As shown, the lithium battery with high space utilization rate further includes an explosion-proof plate 6 , and an explosion-proof plate 6 is installed in one end of the main explosion-proof hole 211 and the auxiliary explosion-proof hole 212 close to the winding core 4 .

[0057] According to the structure described above, the main explosion-proof hole 211 and the auxiliary explosion-proof hole 212 can release pressure at the same time, thereby ensuring the safety and reliability of the lithium battery during use.

[0058] Further, preferably, a main installation groove can be opened at one end of the main explosion-proof hole 211 close to the winding core 4 for installing the explosion-proof plate 6; an auxiliary installation groove can be opened at one end of the auxiliary explosion-proof hole 212 close to the winding core 4 for installing the explosion-proof plate 6.

[0059] In this embodiment, preferably, Figure 7 As shown, the lower plastic 22 is provided with a through main exhaust hole 221 and an auxiliary exhaust hole 222, and the main exhaust hole 221 corresponds to and is connected with the main explosion-proof hole 211, and preferably, along the height direction of the winding core 4, the main exhaust hole 221 and the main explosion-proof hole 211 are arranged opposite to each other;

[0060] The auxiliary exhaust hole 222 corresponds to and is connected to the auxiliary explosion-proof hole 212 , and preferably, along the height direction of the winding core 4 , the auxiliary exhaust hole 222 is arranged opposite to the auxiliary explosion-proof hole 212 .

[0061] According to the structure described above, when the explosion-proof plate 6 ruptures, the main exhaust hole 221 is connected to the main explosion-proof hole 211, and the auxiliary exhaust hole 222 is connected to the auxiliary explosion-proof hole 212, which are used for exhaust and pressure relief respectively.

[0062] Further, preferably, the number of the main explosion-proof hole 211 is one, and the number of the auxiliary explosion-proof holes 212 is four, and they are distributed on four sides of the main explosion-proof hole 211 .

[0063] Further, preferably, the number of main exhaust holes 221 is one, the number of auxiliary exhaust holes 222 is two, and they are distributed on two opposite sides of the main exhaust hole 221 along the length direction of the cover plate 2. Correspondingly, since the width of the lower plastic 22 is relatively small, the main exhaust hole 221 is lengthened along the width direction of the lower plastic 22 so that it is located below the main explosion-proof hole 211 and the two auxiliary explosion-proof holes 212 along the width direction of the cover plate 2, so that the main exhaust hole 221 is connected to the main explosion-proof hole 211 and the two auxiliary explosion-proof holes 212 along the width direction of the cover plate 2 at the same time for exhaust, and the number of explosion-proof plates 6 can also be saved; the two auxiliary exhaust holes 222 arranged along the length direction of the cover plate 2 correspond one-to-one to and are connected to the corresponding two auxiliary explosion-proof holes 212.

[0064] It should be noted that the number and distribution of the auxiliary explosion-proof holes 212 and the auxiliary exhaust holes 222 are not limited to the above, and can also be designed according to actual needs. For example, the number of auxiliary explosion-proof holes 212 is one, two or three, or the number of auxiliary explosion-proof holes 212 is more than four, such as five, six, etc., and the number of auxiliary exhaust holes 222 is adjusted accordingly.

[0065] In this embodiment, preferably, Figure 7 As shown, the bare aluminum plate 21 is provided with a first liquid injection hole 213, and the lower plastic 22 is provided with a second liquid injection hole 223, and the second liquid injection hole 223 corresponds to and is connected with the first liquid injection hole 213, and preferably, along the height direction of the winding core 4, the first liquid injection hole 213 and the second liquid injection hole 223 are arranged opposite each other.

[0066] According to the structure described above, the first injection hole 213 and the second injection hole 223 form an injection channel, which can inject electrolyte into the interior of the housing 1.

[0067] In this embodiment, preferably, Figure 7As shown, the number of the first liquid injection holes 213 and the number of the second liquid injection holes 223 are both two, and they correspond one to one.

[0068] According to the structure described above, it can be seen that multiple injection holes are used, that is, multiple channels are formed, one of which is injected with liquid, and another channel is connected to the outside atmosphere, which greatly speeds up the injection efficiency.

[0069] Further, preferably, along the length direction of the plain aluminum plate 21, the two first injection holes 213 are respectively arranged on both sides of the plain aluminum plate 21; along the length direction of the lower plastic 22, the two second injection holes 223 are respectively arranged on both sides of the lower plastic 22. It can be seen that the injection and exhaust do not affect each other, and it helps to improve the uniformity and reliability of the injection. In addition, the appearance is more beautiful.

[0070] Of course, this is not limited to the above. The number of the first injection hole 213 and the second injection hole 223 can also be one and correspond one to one, or the number of the first injection hole 213 and the second injection hole 223 can be greater than two and correspond one to one, for example: the number of the first injection hole 213 and the second injection hole 223 can be two or three, etc., which is designed according to actual needs.

[0071] In this embodiment, preferably, the winding core 4 and the connecting sheet 5 can be connected by ultrasonic welding. Of course, it is not limited to this, and other welding methods can also be used.

[0072] In this embodiment, preferably, Figure 7 As shown, the lithium battery with high space utilization provided by the present application also includes an upper plastic 7, a welding fixing ring 8 and a sealing ring 9; wherein, a mounting groove is formed on the outer periphery of the pole 3, the welding fixing ring 8 is installed in the mounting groove, and is connected to the pole 3 by welding; the upper plastic 7 extends along the outer periphery of the welding fixing ring 8 and wraps the outer wall of the welding fixing ring 8 to separate the welding fixing ring 8 and the bare aluminum plate 21, and preferably, the upper plastic 7 is formed on the welding fixing ring 8 and the bare aluminum plate 21 by injection molding, and by injection molding, not only the upper plastic 7 can be formed, but also the welding fixing ring 8, the bare aluminum plate 21 and the pole 3 can be further reinforced and connected together, and then the bare aluminum plate 21, the lower plastic 22, the welding fixing ring 8 and the pole 3 can be assembled together in advance, which is convenient for the later assembly of the whole with the connecting plate 5; the sealing ring 9 is sleeved on the outside of the pole 3, and the sealing ring 9 is compressed at the opening end of the through hole for installing the pole 3 below the mounting groove away from the winding core 4, playing a sealing role.

[0073] It should be noted that the length direction of the bare aluminum plate 21 is the same as the length direction of the lower plastic 22, the width direction of the bare aluminum plate 21 is the same as the width direction of the lower plastic 22, the height direction of the bare aluminum plate 21 is the same as the height direction of the lower plastic 22; the height direction of the pole 3, the height direction of the bare aluminum plate 21, the height direction of the lower plastic 22 and the height direction of the winding core 4 are all the same.

[0074] In addition, it should be noted that: in this embodiment, two poles 3 are installed on the cover plate 2, one of which is a positive pole and the other is a negative pole, and each of the positive pole and the negative pole is equipped with a connecting piece 5, which is connected to the positive and negative pole ear clusters of the corresponding winding core 4. Of course, it is not limited to this, and another pole 3 can be installed on the cover plate 2, and correspondingly, only one connecting piece 5 is required for this pole 3, and the specific design is based on actual needs.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A lithium battery with high space utilization, characterized in that: include: A shell, a cover plate, a pole, a winding core and a connecting piece; wherein the winding core and the connecting piece are both installed in the shell, the cover plate is sealed at the opening of the shell, and the connecting piece is arranged between the winding core and the cover plate; The pole is installed in the through hole of the cover plate, and the pole is formed with a mounting through hole; a part of the structure of the connecting piece is inserted in the mounting through hole and is connected to the pole by welding, and another part of the structure of the connecting piece extends to the outside of the mounting through hole and abuts against the side of the pole ear cluster of the winding core, and is connected to the pole ear cluster by welding.

2. The lithium battery with high space utilization according to claim 1, characterized in that: The mounting through hole and the connecting piece are both U-shaped and fit together; There are two winding cores, and the tab clusters of the two winding cores are respectively against the two outer sides of the U-shaped connecting piece and are respectively connected by welding.

3. The lithium battery with high space utilization according to claim 2, characterized in that: A notch is formed at one end of the connecting piece opposite to the open end.

4. The lithium battery with high space utilization according to claim 1, characterized in that: The connecting piece is not exposed on the outer end surface of the pole along the height direction thereof.

5. The lithium battery with high space utilization according to any one of claims 1 to 4, characterized in that: The cover plate includes a plain aluminum plate and a lower plastic; wherein the lower plastic is installed on a side of the plain aluminum plate close to the winding core.

6. The lithium battery with high space utilization according to claim 5, characterized in that: The bare aluminum plate is formed with a main explosion-proof hole and an auxiliary explosion-proof hole which are arranged at intervals, and the auxiliary explosion-proof hole is arranged on the side of the main explosion-proof hole; The lithium battery with high space utilization also includes an explosion-proof plate, and the explosion-proof plate is installed in one end of the main explosion-proof hole and the auxiliary explosion-proof hole close to the winding core.

7. The lithium battery with high space utilization according to claim 6, characterized in that: The lower plastic is provided with a through main exhaust hole and an auxiliary exhaust hole, and the main exhaust hole corresponds to and is connected with the main explosion-proof hole, and the auxiliary exhaust hole corresponds to and is connected with the auxiliary explosion-proof hole.

8. The lithium battery with high space utilization according to claim 5, characterized in that: The bare aluminum plate is provided with a first liquid injection hole, the lower plastic is provided with a second liquid injection hole, and the second liquid injection hole corresponds to and is connected with the first liquid injection hole.

9. The lithium battery with high space utilization according to claim 8, characterized in that: The number of the first liquid injection holes and the second liquid injection holes are both multiple and correspond one to one.

10. The lithium battery with high space utilization according to claim 9, characterized in that: Along the length direction of the plain aluminum plate, the two first liquid injection holes are respectively arranged on both sides of the plain aluminum plate; Along the length direction of the lower plastic, the two second liquid injection holes are respectively arranged on two sides of the lower plastic.

11. The lithium battery with high space utilization according to claim 5, characterized in that: The square shell lithium battery with high space utilization also includes a welding fixing ring and an upper plastic; wherein the welding fixing ring is sleeved on the outside of one end of the pole exposed to the cover plate assembly; the upper plastic extends along the outer circumference of the welding fixing ring and wraps the outer wall of the welding fixing ring to separate the welding fixing ring from the bare aluminum plate, and the upper plastic is formed on the welding fixing ring and the bare aluminum plate by injection molding.

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