Single battery and battery pack

Abstract

The utility model provides a single battery and a battery pack. The single battery comprises a shell and a cover plate which are integrally formed, the upper end of the shell is provided with an opening, and the length L, the height H and the width W of the shell meet the requirements that the length L is larger than or equal to 300 mm, the height H is larger than or equal to 50 mm, and the width W is larger than or equal to 12 mm. The cover plate is arranged at the opening, an accommodating cavity for accommodating the pole group is defined by the cover plate and the shell, a positive pole column and a negative pole column are arranged on the cover plate at an interval, and the positive pole column and the negative pole column are respectively connected with a positive lug and a negative lug of the pole group. According to the single battery disclosed by the utility model, by adopting the integrally formed shell, the adverse risk caused by welding of the shell can be effectively avoided, and by adopting the structural form that the positive pole and the negative pole are arranged on the same side, the assembly procedures can be reduced, the production cost is reduced, and the market competitiveness is favorably improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, and in particular to a single cell battery. The utility model also relates to a battery pack provided with the single cell battery. Background Art

[0002] In the prior art, in the single cell structure, for the single cell with positive and negative poles arranged on the same side, the length is usually less than 300 mm, and the shell is usually formed by stretching and stamping, and the capacity of a single cell is small. For the battery structure with a length greater than 300 mm, the positive pole and negative pole are basically arranged on the opposite sides of the battery, and the battery shell is basically a welded structure, the shell welding sealing is poor, and the cost is high. In addition, for the structure with positive and negative poles arranged on opposite sides, the assembly is complex and the yield is low, resulting in high cost and insufficient market competitiveness. Utility Model Content

[0003] In view of this, the utility model aims to provide a single cell battery, which can avoid the risk of adverse effects caused by shell welding, reduce assembly processes, and lower production costs.

[0004] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0005] A single cell battery comprises an integrally formed shell and a cover plate;

[0006] The upper end of the shell has an opening, and the length L, height H and width W of the shell respectively meet the following requirements: length L ≥ 300 mm, height H ≥ 50 mm, width W ≥ 12 mm;

[0007] The cover plate is arranged at the opening and defines a housing cavity for housing the electrode group together with the shell. A positive electrode column and a negative electrode column are arranged on the cover plate at intervals. The positive electrode column and the negative electrode column are respectively connected to the positive electrode ear and the negative electrode ear of the electrode group.

[0008] Furthermore, an insulating member is provided between the cover plate and the positive electrode column, and between the cover plate and the negative electrode column.

[0009] Furthermore, a recessed groove is provided on the upper end surface of the cover plate; the insulating member includes an upper plastic member, the upper plastic member has a main body and a convex edge connected to the main body, a fixing groove for fixing the positive pole or the negative pole is formed in the main body, and the convex edge is installed in the recessed groove.

[0010] Furthermore, a first rivet block is provided at one end of the positive electrode column located outside the shell, and the first rivet block is used to be electrically connected to the bus; and / or a second rivet block is provided at one end of the negative electrode column located outside the shell, and the second rivet block is used to be electrically connected to the bus.

[0011] Further, the positive electrode column is fixed to the corresponding upper plastic part through the first rivet block; and / or the negative electrode column is fixed to the corresponding upper plastic part through the second rivet block.

[0012] Furthermore, a seal is provided between the cover plate and the positive electrode column, and between the cover plate and the negative electrode column.

[0013] Furthermore, the sealing member includes a sealing ring having a main body portion sleeved on the positive electrode column or the negative electrode column, and an extending portion connected to the main body portion, wherein the extending portion extends radially outwardly along the sealing ring and abuts against one side of the cover plate.

[0014] Furthermore, one end of the sealing ring away from the extending portion abuts against the insulating member.

[0015] Furthermore, an explosion-proof valve and a liquid injection hole are provided on the cover plate; the explosion-proof valve and the liquid injection hole are arranged at intervals and are located between the positive pole and the negative pole.

[0016] Compared with the prior art, the utility model has the following advantages:

[0017] The single cell battery described in the utility model is provided with an integrally formed shell, so that two opposite large faces on the shell and two side faces and one end face between the two large faces are correspondingly closed and connected, and the other end face forms an opening for installing a cover plate. The shell with an integral structure thus formed can avoid the adverse risks caused by shell welding, and adopts a structural form in which the positive pole and the negative pole are arranged on the same side, which can reduce the assembly process and reduce the cost of the single cell battery, thereby helping to improve the market competitiveness.

[0018] In addition, insulating members are provided between the cover plate and the positive pole, and between the cover plate and the negative pole, to ensure insulation between the cover plate and the positive pole, and between the cover plate and the negative pole. The upper plastic member has a main body and a convex edge, so that the convex edge is installed in the sink groove on the cover plate, and the positive pole or the negative pole is fixed in the fixing groove in the main body, which can ensure the installation effect of the upper plastic member on the cover plate, and the fixing effect of the positive pole and the negative pole on the cover plate can also be ensured.

[0019] Secondly, the first rivet block provided at one end of the positive pole is conducive to ensuring the reliability of the electrical connection between the positive pole and the busbar, and the second rivet block provided at one end of the negative pole is conducive to ensuring the reliability of the electrical connection between the negative pole and the busbar. Moreover, the positive pole is fixed to the corresponding upper plastic part through the first rivet block, which is conducive to ensuring the connection effect between the positive pole and the upper plastic part. The negative pole is fixed to the corresponding upper plastic part through the second rivet block, which is conducive to ensuring the connection effect between the negative pole and the upper plastic part.

[0020] Furthermore, a sealing member is provided between the cover plate and the positive electrode column, and between the cover plate and the negative electrode column, which is conducive to ensuring the sealing performance between the cover plate and the positive electrode column, and between the cover plate and the negative electrode column, so as to effectively prevent the electrolyte in the shell from overflowing. The sealing member adopts a sealing ring, and the main body of the sealing ring is sleeved on the positive electrode column or the negative electrode column, and the protruding part extends outward along the radial direction of the sealing ring and abuts against one side of the cover plate. Such a configuration makes the structure of the sealing ring relatively simple, and can further ensure the sealing effect between the cover plate and the positive electrode column, or between the cover plate and the negative electrode column.

[0021] In addition, the end of the sealing ring away from the extension part is in contact with the insulating part, so that the cooperation between the sealing ring and the insulating part can ensure the insulation connection while increasing the sealing area between the cover plate and the pole, which is conducive to further improving the sealing effect. The explosion-proof valve provided on the cover plate is conducive to balancing the pressure inside the shell with the pressure outside the shell, and can reduce the function of explosion damage when the battery has thermal runaway. The setting of the injection hole can facilitate the filling of the electrolyte. Moreover, the explosion-proof valve and the injection hole are arranged between the positive pole and the negative pole, which is conducive to the arrangement of the overall structure of the single battery.

[0022] Another object of the present invention is to provide a battery pack, in which the above-mentioned single battery is arranged.

[0023] The battery pack of the present invention has the same beneficial effects as the single battery described above relative to the prior art, and will not be described in detail herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0025] Figure 1 A three-dimensional diagram of a single cell according to an embodiment of the utility model;

[0026] Figure 2 A top view of a single cell according to an embodiment of the utility model;

[0027] Figure 3 for Figure 2 Section view from the middle AA direction;

[0028] Figure 4 for Figure 2 A partial enlarged view of the sectional view in the middle BB direction;

[0029] Figure 5 A cross-sectional view of a housing according to an embodiment of the present utility model;

[0030] Figure 6 A cross-sectional view of the cover plate according to an embodiment of the utility model;

[0031] Description of reference numerals:

[0032] 1. Shell; 2. Cover plate; 3. Pole group; 4. Upper plastic part; 5. Sealing ring;

[0033] 11. open mouth; 201. positive pole; 202. negative pole; 203. explosion-proof valve; 204. injection hole; 21. mounting hole; 22. sink; 2011. first riveting block. DETAILED DESCRIPTION

[0034] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0035] In the description of the present invention, it should be noted that if there are terms such as "upper", "lower", "inner", "outer" and the like indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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 invention. In addition, if there are terms such as "first" and "second", they are also used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0036] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection" and "connector" 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 an indirect connection 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 the present invention can be understood in combination with specific circumstances.

[0037] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0038] Embodiment 1

[0039] The present embodiment relates to a single cell battery, which can avoid the risk of adverse effects caused by shell welding, reduce assembly processes, and reduce production costs.

[0040] In terms of overall composition, Figures 1 to 3 As shown, the single cell of this embodiment includes an integrally formed shell 1 and a cover plate 2. The upper end of the shell 1 has an opening 11, and the length L, height H and width W of the shell 1 respectively satisfy: length L ≥ 300 mm, height H ≥ 50 mm, width W ≥ 12 mm. The cover plate 2 is arranged at the opening 11 of the shell 1, and defines a sealed accommodation cavity for accommodating the electrode group 3 together with the shell 1, and a positive electrode column 201 and a negative electrode column 202 are arranged on the cover plate 2 at intervals, and the positive electrode column 201 and the negative electrode column 202 are respectively connected to the positive electrode ear and the negative electrode ear of the electrode group 3.

[0041] In the above structure, by adopting an integrally formed shell 1, the two opposite large faces on the shell 1 and the two side faces and one end face between the two large faces are correspondingly closed and connected, and the other end face forms an opening 11 for installing the cover plate 2. The shell 1 of this integral structure can avoid the adverse risks caused by the welding of the shell 1 in the prior art. Moreover, the positive pole 201 and the negative pole 202 are arranged on the same side, which can also reduce the assembly process and reduce the cost of the single cell, thereby helping to improve market competitiveness. Among them, the shell 1 can be prepared and formed by, for example, the existing stamping and stretching process.

[0042] For more details, see Figures 1 to 3 , and combined with Figure 5 and Figure 6 As shown, as a preferred implementation form, in this embodiment, the shell 1 is structurally formed with a cavity for accommodating the pole, and the shell 1 is only provided with an opening 11 at the upper end, and the cover plate 2 is blocked at the opening 11 and is welded to the shell 1, thereby forming a sealed accommodating cavity between the shell 1 and the cover body.

[0043] See also Figure 2 and Figure 4 In this embodiment, an insulating member is provided between the cover plate 2 and the positive electrode column 201, and between the cover plate 2 and the negative electrode column 202. The provision of the insulating member can ensure the insulation between the cover plate 2 and the positive electrode column 201, and between the cover plate 2 and the negative electrode column 202.

[0044] As a preferred embodiment, see Figure 2 , Figure 4 and Figure 6, the upper end surface of the cover plate 2 of this embodiment is provided with a sink groove 22, and the sink groove 22 is connected to the mounting hole 21 of the pole. The above-mentioned insulating member includes an upper plastic member 4, which has a main body and a convex edge connected to the main body, and a fixing groove for fixing the positive pole 201 or the negative pole 202 is formed in the main body, and the convex edge is installed in the sink groove 22. At this time, the main body of the upper plastic member 4 can make the positive pole 201 or the negative pole 202 be fixed well, and the fixing effect of the positive pole 201 and the negative pole 202 on the cover plate 2 can be ensured. The convex edge of the upper plastic member 4 is installed in the sink groove 22 on the cover plate 2, which can ensure the installation effect of the upper plastic member 4 on the cover plate 2.

[0045] In order to better understand the present solution, the upper plastic part 4 is defined as a first upper plastic part and a second upper plastic part, wherein the first upper plastic part corresponds to the positive electrode column 201, and the second upper plastic part corresponds to the negative electrode column 202. The first upper plastic part and the second upper plastic part have the same structure, and abutting end faces are formed in the main bodies of the two. The ends of the positive electrode column 201 and the negative electrode column 202 are both formed with convex parts, and the convex parts abut on the abutting end faces to limit the positive electrode column 201 on the first upper plastic part and limit the negative electrode column 202 on the second upper plastic part.

[0046] In order to ensure the reliability of the electrical connection between the positive electrode column 201 and the negative electrode column 202 and the busbar, in this embodiment, a first rivet block 2011 is provided at one end of the positive electrode column 201 located outside the shell 1, and the first rivet block 2011 is used to be electrically connected to the busbar. In addition, a second rivet block is also provided at one end of the negative electrode column 202 located outside the shell 1, and the second rivet block is used to be electrically connected to the busbar. At this time, the provision of the first rivet block 2011 is conducive to ensuring the reliability of the electrical connection between the positive electrode column 201 and the busbar, and the provision of the second rivet block is conducive to ensuring the reliability of the electrical connection between the negative electrode column 202 and the busbar.

[0047] Moreover, in this embodiment, the positive electrode column 201 is fixed to the corresponding upper plastic part 4 through the first rivet block 2011, and the negative electrode column 202 is fixed to the corresponding upper plastic part 4 through the second rivet block. That is, the positive electrode column 201 is fixed to the first upper plastic part through the first rivet block 2011, and the negative electrode column 202 is fixed to the second upper plastic part through the second rivet block. At this time, the first rivet block 2011 and the second rivet block respectively constitute the outer protrusions on the ends of the positive electrode column 201 and the negative electrode column 202, that is, the first rivet block 2011 abuts on the first upper plastic part, and the second rivet block abuts on the second upper plastic part, so that the connection effect between the positive electrode column 201 and the negative electrode column 202 and the cover body can be ensured.

[0048] It should be noted that, in addition to using the first rivet block 2011 and the second rivet block to connect with the corresponding upper plastic part 4, the positive electrode column 201 and the negative electrode column 202 may also adopt other structural forms. For example, the positive electrode column 201 and the negative electrode column 202 may adopt a T-shaped structure in the longitudinal section, and the outer protrusion at the end is connected to the abutting end surface by abutting, which is also feasible.

[0049] On the basis of the upper plastic part 4, in this embodiment, a seal is provided between the cover plate 2 and the positive electrode column 201, and between the cover plate 2 and the negative electrode column 202. The provision of the seal is conducive to ensuring the sealing performance between the cover plate 2 and the positive electrode column 201, and between the cover plate 2 and the negative electrode column 202, so as to effectively prevent the electrolyte in the housing 1 from overflowing.

[0050] Specifically, as a preferred embodiment, the sealing member of this embodiment includes a sealing ring 5, which has a main body portion sleeved on the positive electrode column 201 or the negative electrode column 202, and an extension portion connected to the main body portion, the extension portion extending outward along the radial direction of the sealing ring 5, and abutting against one side of the cover plate 2. This structural arrangement makes the structure of the sealing ring 5 relatively simple, easy to prepare and form, and the arrangement of the sealing ring 5 can further ensure the sealing effect between the cover plate 2 and the positive electrode column 201, and between the cover plate 2 and the negative electrode column 202.

[0051] Preferably, in this embodiment, one end of the sealing ring 5 away from the protruding portion is in contact with the insulating member. In this way, the cooperation between the sealing ring 5 and the insulating member can ensure the insulation connection between the cover plate 2 and the poles (positive pole 201 and negative pole 202), and can also increase the sealing area between the cover plate 2 and the poles, which is conducive to further improving the sealing effect.

[0052] In addition, in this embodiment, an explosion-proof valve 203 and a liquid injection hole 204 are also provided on the cover plate 2. The explosion-proof valve 203 and the liquid injection hole 204 are arranged at intervals and are located between the positive pole 201 and the negative pole 202. Among them, the setting of the explosion-proof valve 203 is conducive to balancing the pressure inside the shell 1 with the pressure outside the shell 1, and can reduce the function of explosion damage when the battery has thermal runaway. The setting of the liquid injection hole 204 is conducive to the filling of the electrolyte. Moreover, the explosion-proof valve 203 and the liquid injection hole 204 are arranged between the positive pole 201 and the negative pole 202, which is conducive to the arrangement of the overall structure of the single battery.

[0053] The single cell battery of this embodiment uses a shell 1 integrally formed by a stamping and stretching process, which can effectively avoid the risk of adverse effects caused by welding of the shell 1. In addition, the structural form of arranging the positive electrode column 201 and the negative electrode column 202 on the same side can also reduce the assembly process and reduce the production cost, thereby helping to improve market competitiveness and having a good use effect.

[0054] Embodiment 2

[0055] This embodiment relates to a battery pack, in which the single battery described in the first embodiment is provided.

[0056] The battery pack of this embodiment adopts the single battery of the first embodiment, which can avoid the risk of defects caused by the welding of the shell 1, improve the product yield of the battery pack, and also reduce the assembly process and reduce the production cost of the battery pack.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A single cell battery, characterized in that: It includes an integrally formed shell and a cover plate; The upper end of the shell has an opening, and the length L, height H and width W of the shell respectively meet the following requirements: length L ≥ 300 mm, height H ≥ 50 mm, width W ≥ 12 mm; The cover plate is arranged at the opening and defines a housing cavity for housing the electrode group together with the shell. A positive electrode column and a negative electrode column are arranged on the cover plate at intervals. The positive electrode column and the negative electrode column are respectively connected to the positive electrode ear and the negative electrode ear of the electrode group.

2. The single cell according to claim 1, characterized in that: An insulating member is provided between the cover plate and the positive electrode column, and between the cover plate and the negative electrode column.

3. The single cell according to claim 2, characterized in that: The upper end surface of the cover plate is provided with a sink groove; The insulating member includes an upper plastic member, which has a main body and a convex edge connected to the main body. A fixing groove for fixing the positive pole or the negative pole is formed in the main body, and the convex edge is installed in the sink.

4. The single cell according to claim 3, characterized in that: A first rivet block is provided at one end of the positive electrode column located outside the shell, and the first rivet block is used to be electrically connected to the bus; and / or, a second rivet block is provided at one end of the negative electrode column located outside the shell, and the second rivet block is used to be electrically connected to the bus.

5. The single cell according to claim 4, characterized in that: The positive electrode column is fixed to the corresponding upper plastic part through the first rivet block; and / or the negative electrode column is fixed to the corresponding upper plastic part through the second rivet block.

6. The single cell according to claim 2, characterized in that: A sealing member is provided between the cover plate and the positive electrode column, and between the cover plate and the negative electrode column.

7. The single cell according to claim 6, characterized in that: The sealing member comprises a sealing ring having a main body portion sleeved on the positive pole or the negative pole, and an overhang portion connected to the main body portion, wherein the overhang portion extends radially outwardly along the sealing ring and abuts against one side of the cover plate.

8. The single cell according to claim 7, characterized in that: One end of the sealing ring away from the protruding portion abuts against the insulating member.

9. The single cell according to any one of claims 1 to 8, characterized in that: The cover plate is provided with an explosion-proof valve and a liquid injection hole; The explosion-proof valve and the liquid injection hole are arranged at intervals and are located between the positive pole and the negative pole.

10. A battery pack, characterized in that: The battery pack is provided with the single battery according to any one of claims 1 to 9.

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