Battery and battery module

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery and a battery module, the battery comprises a shell, a conductive cover plate, a cover plate assembly and a pole group, the conductive cover plate and the cover plate assembly are respectively arranged at two sides of the shell and are used for forming a storage cavity for placing the pole group, a positive pole lug of the pole group is connected with any one of the conductive cover plate or the cover plate assembly, and a negative pole lug of the pole group is connected with the shell. And the negative tab is connected with the other one of the conductive cover plate or the cover plate assembly. Any one of the positive tab or the negative tab on the pole group is directly connected to the conductive cover plate, and the other one is connected with the cover plate assembly, so that any one of the positive tab or the negative tab is directly connected with the conductive cover plate, on one hand, the risk of sealing failure caused by welding is reduced, and the sealing reliability after assembly is improved; due to the fact that the number of parts is reduced, repeated positioning is not needed, the assembling process is simplified, and due to the fact that the structure is simplified, occupied space is reduced, limitation to the size of the pole set is reduced, and the power supply capacity is improved.

Description

Technical Field

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

[0002] With the increasing maturity of lithium-ion battery technology, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields, and the requirements for the use performance and safety of lithium-ion batteries are increasing day by day.

[0003] The conventional blade electrode group adopts a structure with electrode tabs on both sides. Therefore, a positive electrode cover assembly connected to the positive electrode tab and a negative electrode cover assembly connected to the negative electrode tab are provided. Among them, both the positive electrode cover assembly and the negative electrode cover assembly are composed of components such as electrode posts, sealing rings, light aluminum sheets, upper plastics, and lower plastics. When the electrode tab is welded to the cover, affected by high temperature, the lower plastic and the sealing ring are often burned, resulting in the risk of sealing failure. And because the number of components constituting the positive electrode cover assembly and the negative electrode cover assembly is large, on the one hand, multiple positionings are required for the assembly between parts, resulting in complex processes and being not conducive to automated production. On the other hand, because the cover assembly has a large volume, it will occupy more space, so the volume of the electrode group is limited, thus affecting the power supply capacity. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a battery and a battery module with fewer components, reliable structure and easy installation, and less space occupation.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] On the one hand, a battery is provided. The battery includes a housing, a conductive cover plate, a cover assembly, and an electrode group. The conductive cover plate and the cover assembly are respectively arranged on both sides of the housing to form a storage chamber for placing the electrode group. The electrode group includes a positive electrode tab and a negative electrode tab. The positive electrode tab is connected to any one of the conductive cover plate or the cover assembly, and the negative electrode tab is connected to the remaining one of the conductive cover plate or the cover assembly.

[0007] Optionally, a connection structure for connecting with a bus bar is provided on the conductive cover plate, and the connection structure protrudes in a direction away from the electrode group.

[0008] Optionally, the thickness dimension of the connection structure protruding in a direction away from the electrode group is H, and 0mm≤H≤4mm is satisfied.

[0009] Optionally, the cross-section of the connection structure is circular or polygonal or elliptical.

[0010] Optionally, the battery further comprises a supporting insulating frame, wherein the supporting insulating frame is arranged in the outer shell and is located between the conductive cover plate and the positive electrode ear or the negative electrode ear connected to the conductive cover plate, and a through hole is opened on the supporting insulating frame, and the positive electrode ear or the negative electrode ear connected to the conductive cover plate is connected to the conductive cover plate through the through hole.

[0011] Optionally, a supporting groove is further provided on the supporting insulating frame, the through hole is opened at the bottom of the supporting groove, and the bent positive electrode ear or the negative electrode ear is accommodated in the supporting groove.

[0012] Optionally, the supporting insulating frame is further provided with a receiving groove parallel to the supporting groove, and the supporting insulating frame is further provided with a plurality of reinforcing ribs, and the plurality of reinforcing ribs are arranged in the receiving groove at intervals.

[0013] Optionally, the conductive cover plate further includes a plug-in protrusion plugged into the housing.

[0014] Optionally, the cover plate assembly includes a cover plate body, a pole, a rivet block, an upper insulating member and a lower insulating member, the lower insulating member is arranged on the inner side of the cover plate body facing the pole group, the upper insulating member is arranged on the outer side of the cover plate body away from the pole group, the rivet block is arranged on the side of the upper insulating member away from the cover plate body, and the pole passes through the lower insulating member, the cover plate body and the upper insulating member in sequence and is riveted to the rivet block.

[0015] On the other hand, a battery module is provided, the battery module comprising a plurality of batteries as described in any one of the above items, and the battery module further comprising a bus bar for connecting the plurality of batteries.

[0016] Beneficial effects of the utility model:

[0017] The utility model provides a battery, which includes a shell, a conductive cover plate, a cover plate assembly and a pole group. The pole group is placed in a storage chamber formed by the shell, the conductive cover plate and the cover plate assembly. Compared with connecting both the positive pole ear and the negative pole ear to their respective corresponding cover plate assemblies, by directly connecting either the positive pole ear or the negative pole ear on the pole group to the conductive cover plate, and the other to the cover plate assembly, either the positive pole ear or the negative pole ear is directly connected to the conductive cover plate. On the one hand, the risk of sealing failure due to welding is reduced, and the reliability of sealing after assembly is improved. On the other hand, since the number of parts is reduced, multiple positioning is not required, and the assembly process is simplified. In addition, due to the simplification of the structure, the space occupation is reduced, thereby reducing the restriction on the volume of the pole group and improving the power supply capacity.

[0018] The present utility model also provides a battery module. By applying the above-mentioned battery, since the battery has better sealing performance and a larger volume, the safety of the battery module is improved, and the power supply capacity of the battery module is enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic exploded view of the positive electrode end of the battery provided by the present utility model;

[0020] Figure 2 is a front cross-sectional view of the positive electrode end of the battery provided by the present utility model;

[0021] Figure 3 is a side cross-sectional view of the positive electrode end of the battery provided by the present utility model;

[0022] Figure 4 is a front cross-sectional view of the negative electrode end of the battery provided by the present utility model;

[0023] Figure 5 is a side cross-sectional view of the negative electrode end of the battery provided by the present utility model;

[0024] Figure 6 is a three-dimensional structural schematic diagram of the conductive cover plate of the battery provided by the present utility model;

[0025] Figure 7 is a cross-sectional view of the conductive cover plate of the battery provided by the present utility model;

[0026] Figure 8 is a three-dimensional structural schematic diagram of the cover plate assembly of the battery provided by the present utility model;

[0027] Figure 9 is a three-dimensional structural schematic diagram of the support insulating frame of the battery provided by the present utility model.

[0028] In the figures:

[0029] 1. Outer shell;

[0030] 2. Conductive cover plate; 21. Connection structure; 22. Insertion protrusion;

[0031] 3. Cover plate assembly; 31. Cover plate body; 32. Terminal post; 33. Riveting block; 34. Upper insulating part; 35. Lower insulating part; 36. Sealing ring;

[0032] 4. Electrode group; 41. Positive electrode tab; 42. Negative electrode tab;

[0033] 5. Support insulating frame; 51. Through hole; 52. Support groove; 53. Reinforcing rib; 54. Accommodation groove;

[0034] 6. Explosion-proof valve. Detailed Implementation Manner

[0035] The present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the convenience of description, only the parts related to the present utility model rather than all the structures are shown in the accompanying drawings.

[0036] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0037] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "above and to the right of", and "on the top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is at a higher horizontal height than the second feature. The first feature being "below", "below and to the left of", and "under the bottom of" the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the first feature is at a lower horizontal height than the second feature.

[0038] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the accompanying drawings. It is only for the convenience of description and simplifying the operation, 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. Therefore, it cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meanings.

[0039] With the increasing maturity of lithium-ion battery technology, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields, and the requirements for the use performance and safety of lithium-ion batteries are increasing day by day.

[0040] The conventional blade electrode group adopts a structure with pole tabs on both sides. Therefore, a positive cover plate assembly connected to the positive pole tab and a negative cover plate assembly connected to the negative pole tab are provided. Among them, both the positive cover plate assembly and the negative cover plate assembly are composed of components such as pole columns, sealing rings, light aluminum sheets, upper plastics, and lower plastics. When welding the pole tab to the cover plate, affected by high temperature, the lower plastics and the sealing ring are often burned, resulting in the risk of sealing failure. And because the number of components constituting the positive cover plate assembly and the negative cover plate assembly is large, on the one hand, multiple positionings are required for the assembly between parts, resulting in complex processes and being not conducive to automated production. On the other hand, because the cover plate assembly is large in volume, it will occupy more space, so the volume of the electrode group is restricted, thus affecting the power supply capacity.

[0041] Therefore, in order to reduce the risk of sealing failure caused by welding, improve the sealing performance after assembly, and reduce the number of components, simplify the structure, reduce the occupied space, and reduce the limitation on the volume of the electrode group, this embodiment provides a battery.

[0042] As Figures 1 to 9 shown, the battery includes a housing 1, a conductive cover plate 2, a cover plate assembly 3, and an electrode group 4. The conductive cover plate 2 and the cover plate assembly 3 are respectively arranged on both sides of the housing 1 to form a storage chamber for placing the electrode group 4. The electrode group 4 includes a positive pole tab 41 and a negative pole tab 42. The positive pole tab 41 is connected to any one of the conductive cover plate 2 or the cover plate assembly 3, and the negative pole tab 42 is connected to the remaining one of the conductive cover plate 2 or the cover plate assembly 3.

[0043] The battery includes a housing 1, a conductive cover plate 2, a cover plate assembly 3, and an electrode group 4. The electrode group 4 is placed in the storage chamber formed by the housing 1, the conductive cover plate 2, and the cover plate assembly 3. Compared with connecting both the positive pole tab 41 and the negative pole tab 42 to their respective corresponding cover plate assemblies 3, by directly connecting either the positive pole tab 41 or the negative pole tab 42 on the electrode group 4 to the conductive cover plate 2 and the other to the cover plate assembly 3, so that either the positive pole tab 41 or the negative pole tab 42 is directly connected to the conductive cover plate 2. On the one hand, the risk of sealing failure caused by welding is reduced, and the reliability of the seal after assembly is improved. On the other hand, because the number of components is reduced, multiple positionings are not required, the assembly process is simplified, and due to the simplification of the structure, the occupied space is reduced, thus reducing the limitation on the volume of the electrode group 4 and improving the power supply capacity.

[0044] In this embodiment, the conductive cover plate 2 is connected to the positive pole tab 41, and the negative pole tab 42 of the electrode group 4 is connected to the cover plate assembly 3 to realize the conduction of the circuit. Among them, the conductive cover plate 2 is a light aluminum plate, and the conductive cover plate 2 and the cover plate assembly 3 on the battery are connected to the housing 1 as a whole through a welding process.

[0045] Optionally, as Figure 3 、 Figure 6, Figure 7 As shown in Figure 7 , a connection structure 21 for connecting with a bus bar is provided on the conductive cover plate 2, and the connection structure 21 protrudes in a direction away from the electrode group 4. By providing the connection structure 21 on the conductive cover plate 2 and making the connection structure 21 protrude in a direction away from the electrode group 4, the distance between the conductive cover plate 2 and the bus bar is reduced, thus facilitating the welding of the conductive cover plate 2 and the bus bar.

[0046] Furthermore, as Figure 7 shown, the thickness dimension H of the connection structure 21 protruding in a direction away from the electrode group 4 satisfies 0 mm ≤ H ≤ 4 mm. By defining the thickness dimension H of the connection structure 21 protruding in a direction away from the electrode group 4 to satisfy 0 mm ≤ H ≤ 4 mm, it not only ensures the gap for facilitating the welding of the conductive cover plate 2 and the bus bar, but also avoids the connection structure 21 protruding too much and increasing the space occupied by the conductive cover plate 2.

[0047] Among them, the thickness dimension H of the connection structure 21 protruding in a direction away from the electrode group 4 can be any value between 0 mm and 4 mm or the range between any two values, such as 0 mm, 1 mm, 2 mm, 3 mm, 4 mm, etc.

[0048] Optionally, as Figure 3 , Figure 6 , Figure 7 shown, the cross-section of the connection structure 21 is circular or polygonal or elliptical. By making the cross-section of the connection structure 21 circular or polygonal or elliptical, it can be adapted to bus bars of various specifications, facilitating the welding of the two. And in this embodiment, the connection structure 21 is obtained by stamping process, and the position of the connection structure 21 on the conductive cover plate 2 can be adjusted according to the position for welding with the bus bar.

[0049] Optionally, as Figure 1 , Figure 3 , Figure 9 shown, the battery further includes a support insulating frame 5. The support insulating frame 5 is arranged in the outer shell 1 and is located between the conductive cover plate 2 and the positive electrode tab 41 or the negative electrode tab 42 connected to the conductive cover plate 2. A through hole 51 is formed in the support insulating frame 5, and the positive electrode tab 41 or the negative electrode tab 42 connected to the conductive cover plate 2 passes through the through hole 51 to be connected to the conductive cover plate 2. By providing the support insulating frame 5 in the battery, the positive electrode tab 41 or the negative electrode tab 42 connected to the conductive cover plate 2 passes through the through hole 51 to be connected to the conductive cover plate 2, thus avoiding the positive electrode tab 41 or the negative electrode tab 42 from accidentally touching the outer shell 1 and improving the safety of the battery. In this embodiment, the support insulating frame 5 is made by injection molding process.

[0050] Furthermore, as Figure 9As shown, the supporting insulating frame 5 is further provided with a supporting groove 52, and the through hole 51 is opened at the groove bottom 52 of the supporting groove, and the bent positive electrode ear 41 or negative electrode ear 42 is accommodated in the supporting groove 52. By providing the supporting groove 52 connected with the through hole 51 on the supporting insulating frame 5, the bent positive electrode ear 41 or negative electrode ear 42 is accommodated in the supporting groove 52, so as to support the bent positive electrode ear 41 or negative electrode ear 42, so as to prevent the positive electrode ear 41 or negative electrode ear 42 from deforming in a direction away from the conductive cover plate 2 under the action of its own gravity, pulling the welding point, and causing the positive electrode ear 41 or negative electrode ear 42 to have poor contact with the conductive cover plate 2.

[0051] Furthermore, if Figure 9 As shown, the supporting insulating frame 5 is further provided with a receiving groove 54 parallel to the supporting groove 52, and the supporting insulating frame 5 is further provided with a plurality of reinforcing ribs 53, and the plurality of reinforcing ribs 53 are arranged at intervals in the receiving groove 54. By arranging a plurality of reinforcing ribs 53 at intervals in the receiving groove 54, the structural strength of the supporting insulating frame 5 is improved.

[0052] Alternatively, if Figure 7 As shown, the conductive cover plate 2 also includes a plugging protrusion 22 plugged into the housing 1. By providing the plugging protrusion 22 on the conductive cover plate 2, the conductive cover plate 2 can be inserted into the housing 1 and then welded, thereby improving the sealing effect of welding.

[0053] Optionally, the cover assembly 3 includes a cover body 31, a pole 32, a rivet block 33, an upper insulating member 34 and a lower insulating member 35, the lower insulating member 35 is arranged on the inner side of the cover body 31 facing the pole group 4, the upper insulating member 34 is arranged on the outer side of the cover body 31 away from the pole group 4, the rivet block 33 is arranged on the side of the upper insulating member 34 away from the cover body 31, and the pole 32 passes through the lower insulating member 35, the cover body 31 and the upper insulating member 34 in sequence and is riveted to the rivet block 33.

[0054] In this embodiment, the conductive cover plate 2 is connected to the positive electrode ear 41, and the negative electrode ear 42 of the electrode group 4 is connected to the pole 32 on the cover plate assembly 3 to achieve circuit conduction. The cover plate body 31 in the conductive cover plate 2 and the cover plate assembly 3 are both made of aluminum plates, and the upper insulating member 34 and the lower insulating member 35 arranged on both sides of the cover plate body 31 are both made of plastic materials. The cover plate assembly 3 also includes a sealing ring 36, which is sleeved on the pole 32 to achieve sealing of the cover plate assembly 3. The conductive cover plate 2 and the cover plate assembly 3 on the battery are connected to the housing 1 as a whole through a welding process.

[0055] Alternatively, if Figure 1As shown in the figure, the battery further includes at least one explosion-proof valve 6, and at least one explosion-proof valve 6 is provided on the outer casing 1. By providing at least one explosion-proof valve 6 on the outer casing 1, when the battery generates pressurized gas inside after long-term use, the pressurized gas can break through the explosion-proof valve 6, achieving the purpose of pressure relief and protection.

[0056] In this embodiment, a battery module is further provided. The battery module includes the above battery, and the battery module further includes a bus bar for connecting multiple batteries. By applying the above battery in the battery module, since the battery has better sealing performance and a larger volume, the safety of the battery module is improved, and the power supply capacity of the battery module is increased.

[0057] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments, and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. A battery, characterized in that The battery comprises an outer shell, a conductive cover plate, a cover plate assembly and an electrode group, wherein the conductive cover plate and the cover plate assembly are respectively arranged on both sides of the outer shell to form a storage chamber for placing the electrode group, and the electrode group comprises a positive electrode ear and a negative electrode ear, wherein the positive electrode ear is connected to any one of the conductive cover plate or the cover plate assembly, and the negative electrode ear is connected to the conductive cover plate or the remaining one of the cover plate assembly.

2. The battery according to claim 1, characterized in that The conductive cover plate is provided with a connection structure for connecting to a bus bar, and the connection structure protrudes in a direction away from the pole group.

3. The battery according to claim 2, characterized in that The thickness dimension of the connection structure protruding in a direction away from the pole group is H, and satisfies 0mm≤H≤4mm.

4. The battery according to claim 2, characterized in that The cross section of the connecting structure is circular, polygonal or elliptical.

5. The battery according to claim 1, characterized in that The battery also includes a supporting insulating frame, which is arranged in the outer shell and located between the conductive cover plate and the positive electrode ear or the negative electrode ear connected to the conductive cover plate. A through hole is opened on the supporting insulating frame, and the positive electrode ear or the negative electrode ear connected to the conductive cover plate is connected to the conductive cover plate through the through hole.

6. The battery according to claim 5, characterized in that The supporting insulating frame is further provided with a supporting groove, the through-hole is opened at the groove bottom of the supporting groove, and the bent positive electrode ear or the negative electrode ear is accommodated in the supporting groove.

7. The battery according to claim 6, characterized in that The supporting insulating frame is also provided with a receiving groove parallel to the supporting groove, and the supporting insulating frame is also provided with a plurality of reinforcing ribs, and the plurality of reinforcing ribs are arranged in the receiving groove at intervals.

8. The battery according to claim 1, characterized in that The conductive cover plate also includes an inserting protrusion which is inserted into the housing.

9. The battery according to claim 1, characterized in that The cover plate assembly includes a cover plate body, a pole, a rivet block, an upper insulating member and a lower insulating member. The lower insulating member is arranged on the inner side of the cover plate body facing the pole group, the upper insulating member is arranged on the outer side of the cover plate body away from the pole group, the rivet block is arranged on the side of the upper insulating member away from the cover plate body, and the pole passes through the lower insulating member, the cover plate body and the upper insulating member in sequence and is riveted to the rivet block.

10. A battery module, characterized in that: The battery module comprises a plurality of batteries as claimed in any one of claims 1 to 9, and the battery module further comprises a bus bar for connecting the plurality of batteries.

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