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 an integrated pole group and a protective frame, the integrated pole group comprises a plurality of single pole groups, tabs of two adjacent single pole groups are welded, the protective frame comprises a protective end plate, a protective side plate and a butt joint module, the protective end plates and the protective side plates are respectively arranged on two sides of the integrated pole group along the first direction and the second direction, the protective side plates are clamped with the protective end plates, a butt joint module is arranged between every two adjacent single pole groups, two sides of each butt joint module along the second direction are respectively connected with the protective side plates, and the butt joint modules are provided with accommodating grooves for accommodating pole lugs. According to the integrated pole group formed by the plurality of single pole groups, undesirable phenomena such as wrinkles, deformation and breakage caused by overlong lengths of the single pole groups are avoided, and the protection performance of the single pole groups and the overall structural strength of the integrated pole group are enhanced through the protection frame, so that the production yield is effectively improved, and the product quality is improved.

Description

Technical Field

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

[0002] Lithium-ion batteries are a high-energy, high-efficiency, and environmentally friendly battery technology. They mainly consist of electrode arrays, casings, and cover plates. These components work together to enable the battery to store energy during charging and release energy when needed. With the increasing maturity of lithium-ion battery technology, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage, leading to increasingly stringent requirements for their performance and safety.

[0003] In order to improve the power supply capacity of lithium-ion batteries, the length of the lithium-ion battery and the internal electrode assembly is usually increased to increase the volume of the electrode assembly, thereby improving the power supply capacity of the single cell. However, the longer the electrode assembly, the weaker its structural strength, and it is extremely easy to suffer from defects such as wrinkles, deformation, and breakage, resulting in low production yield and poor product quality of lithium-ion batteries. Utility Model Content

[0004] The purpose of this utility model is to provide a battery and battery module with high production yield and excellent product quality.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] On one hand, a battery is provided, the battery comprising:

[0007] An integrated electrode group includes multiple individual electrode groups arranged linearly along a first direction. Each individual electrode group has tabs on both sides along the first direction, and the tabs of two adjacent individual electrode groups are welded together.

[0008] A protective frame includes protective end plates, protective side plates, and docking modules. The protective end plates are located on both sides of the integrated electrode assembly along the first direction and have through holes for the electrode tabs to pass through. The protective side plates are located on both sides of the integrated electrode assembly along the second direction and are respectively engaged with the protective end plates located on both sides of the integrated electrode assembly along the first direction. A docking module is provided between each pair of adjacent individual electrode assemblies. The docking module is respectively engaged with the protective side plates located on both sides of the integrated electrode assembly along the second direction. The docking module has a receiving groove, in which the electrode tabs of two adjacent individual electrode assemblies after welding are accommodated.

[0009] Optionally, the docking module includes a first docking member and a second docking member. One side of the first docking member is connected to the protective side plate located on one side of the integrated electrode group along the second direction. The other side of the first docking member is inserted into the second docking member and has a first clearance notch. One side of the second docking member is connected to the protective side plate located on the other side of the integrated electrode group along the second direction. The other side of the second docking member is inserted into the first docking member and has a second clearance notch. The first clearance notch and the second clearance notch together form the receiving groove.

[0010] Optionally, one of the first and second mating members is provided with a plugging protrusion, and the other of the first and second mating members is provided with a plugging hole, wherein the plugging protrusion is inserted into the plugging hole.

[0011] Optionally, the protective end plate has slots on both sides along the second direction, and the protective side plate further includes a protective part and a limiting part. The limiting part is located on both sides of the protective part along the first direction and is perpendicular to the protective part. The protective part is attached to one side of the integrated electrode assembly along the second direction and is embedded in the slot.

[0012] Optionally, the protective part is provided with at least one vent hole.

[0013] Optionally, the battery further includes a casing and a cover plate. The casing is a hollow shell structure with open ends. The cover plate is placed over the open ends of the casing to form a mounting cavity for accommodating the integrated electrode assembly and the protective frame. The cover plate is made of aluminum single plate, and the electrode tabs passing through the through holes on the protective end plate are connected to the cover plate made of aluminum single plate.

[0014] Optionally, the battery further includes at least one explosion-proof valve and a protective patch corresponding to each explosion-proof valve. At least one explosion-proof valve is disposed on the housing, and the protective patch is disposed on the inner side of the housing where the explosion-proof valve is disposed.

[0015] Optionally, the protective patch has a weakening structure.

[0016] Optionally, the cover plate is provided with a boss structure that protrudes outward from the integrated electrode group.

[0017] On the other hand, a battery module is provided, which includes a plurality of batteries as described above.

[0018] The beneficial effects of this utility model are:

[0019] This utility model provides a battery comprising an integrated electrode assembly consisting of multiple individual electrode groups connected end to end, and a protective frame consisting of protective side plates, protective end plates, and a docking module. By placing the protective end plates on both sides of the integrated electrode assembly along a first direction, placing the protective side plates on both sides of the integrated electrode assembly along a second direction, and setting a docking module connecting the protective side plates between two adjacent individual electrode groups, this not only avoids defects such as wrinkles, deformation, and breakage caused by excessive length of the individual electrode groups, but also enhances the protection of the individual electrode groups and electrode tabs, as well as the overall structural strength of the integrated electrode assembly, through the protective side plates, protective end plates, docking module, and the receiving groove opened on the docking module, thereby effectively improving production yield and product quality.

[0020] This utility model also provides a battery module that, by using the aforementioned battery, effectively reduces the probability of battery module failure due to internal power battery issues, thereby extending the battery module's service life, due to the battery's superior product quality. Attached Figure Description

[0021] Figure 1 This is a structural assembly diagram of the battery before it is installed in the casing, provided by this utility model;

[0022] Figure 2 This is an exploded view of the battery structure provided by this utility model before it is installed in the casing;

[0023] Figure 3 This is a schematic diagram of the combined structure of the protective side plate and the second docking member in the battery provided by this utility model;

[0024] Figure 4 This is a schematic diagram of the combined structure of the protective end plate and the protective side plate in the battery provided by this utility model;

[0025] Figure 5 This is a schematic diagram of the structure of the protective end plate in the battery provided by this utility model;

[0026] Figure 6 This is a schematic diagram of the structure of the cover plate in the battery provided by this utility model;

[0027] Figure 7 This is a schematic diagram of the structure of the protective patch in the battery provided by this utility model;

[0028] Figure 8 This is a distribution diagram of the explosion-proof valve in the battery provided by this utility model on one side of the outer casing along a third direction;

[0029] Figure 9 This is a distribution diagram of the explosion-proof valve in the battery provided by this utility model on one side of the outer casing along the second direction.

[0030] In the picture:

[0031] 1. Single electrode assembly; 11. Electrode tab;

[0032] 2. Protective frame; 21. Protective end plate; 211. Through hole; 212. Slot; 22. Protective side plate; 221. Protective part; 222. Limiting part; 223. Vent hole; 23. Docking module; 231. Receiving groove; 232. First docking part; 233. Second docking part; 2331. Second clearance notch; 2332. Insertion hole;

[0033] 3. Outer shell;

[0034] 4. Cover plate; 41. Boss structure;

[0035] 5. Explosion-proof valve;

[0036] 6. Protective patch; 61. Weakened structure. Detailed Implementation

[0037] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0038] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0039] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0040] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0041] Lithium-ion batteries are a high-energy, high-efficiency, and environmentally friendly battery technology. They mainly consist of electrode arrays, casings, and cover plates. These components work together to enable the battery to store energy during charging and release energy when needed. With the increasing maturity of lithium-ion battery technology, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage, leading to increasingly stringent requirements for their performance and safety.

[0042] In order to improve the power supply capacity of lithium-ion batteries, the length of the lithium-ion battery and the internal electrode assembly is usually increased to increase the volume of the electrode assembly, thereby improving the power supply capacity of the single cell. However, the longer the electrode assembly, the weaker its structural strength, and it is extremely easy to suffer from defects such as wrinkles, deformation, and breakage, resulting in low production yield and poor product quality of lithium-ion batteries.

[0043] Therefore, in order to avoid defects such as wrinkles, deformation, and breakage caused by excessive length of the electrode assembly, improve the production yield of lithium-ion batteries, and enhance product quality, this embodiment provides a battery.

[0044] like Figures 1 to 9 As shown, the battery includes an integrated electrode assembly and a protective frame 2. The integrated electrode assembly includes multiple individual electrode assemblies 1 arranged linearly along a first direction. Each individual electrode assembly 1 has tabs 11 on both sides along the first direction. The tabs 11 of two adjacent individual electrode assemblies 1 are welded together. The protective frame 2 includes a protective end plate 21, a protective side plate 22, and a docking module 23. The protective end plate 21 is located on both sides of the integrated electrode assembly along the first direction and has through holes 211 for the tabs 11 to pass through. The protective side plate 22 is located on both sides of the integrated electrode assembly along a second direction. The protective side plate 22 is engaged with the protective end plate 21 located on both sides of the integrated electrode assembly along the first direction. A docking module 23 is provided between each pair of adjacent individual electrode assemblies 1. The docking module 23 is engaged with the protective side plate 22 located on both sides of the integrated electrode assembly along the second direction. The docking module 23 has a receiving groove 231, in which the tabs 11 of two adjacent individual electrode assemblies 1 after welding are accommodated.

[0045] The battery includes an integrated electrode assembly consisting of multiple individual electrode groups 1 connected end to end, and a protective frame 2 consisting of a protective side plate 22, a protective end plate 21, and a docking module 23. By placing the protective end plate 21 on both sides of the integrated electrode assembly along the first direction, placing the protective side plate 22 on both sides of the integrated electrode assembly along the second direction, and setting the docking module 23 connecting the protective side plate 22 between two adjacent individual electrode groups 1, not only are defects such as wrinkles, deformation, and breakage caused by excessive length of the individual electrode group 1 avoided, but the protective side plate 22, the protective end plate 21, the docking module 23, and the receiving groove 231 opened on the docking module 23 are also used to enhance the protection of the individual electrode group 1 and the tab 11, as well as the overall structural strength of the integrated electrode assembly, thereby effectively improving the production yield and product quality.

[0046] In this embodiment, the tabs 11 on both sides of the individual electrode group 1 along the first direction are divided into positive tabs and negative tabs according to their polarity. In the integrated electrode group, the positive tab of any individual electrode group 1 is connected to the negative tab of the previous individual electrode group 1, and the negative tab of any individual electrode group 1 is connected to the positive tab of the next individual electrode group 1, thereby connecting multiple individual electrode groups 1 arranged linearly along the first direction in series to achieve current conduction. In order to ensure good insulation, the protective end plate 21, protective side plate 22 and docking module 23 in the protective frame 2 are all made of plastic and are manufactured by injection molding.

[0047] The number of individual electrode groups 1 constituting the integrated electrode group can be freely set according to the requirements. In this embodiment, the integrated electrode group includes two individual electrode groups 1. Therefore, for the protective frame 2, there are two protective end plates 21, two protective side plates 22 and one docking module 23.

[0048] Optionally, such as Figure 2 , Figure 3As shown, the docking module 23 includes a first docking member 232 and a second docking member 233. One side of the first docking member 232 is connected to a protective side plate 22 located on one side of the integrated electrode group along the second direction. The other side of the first docking member 232 is inserted into the second docking member 233 and has a first clearance notch. One side of the second docking member 233 is connected to a protective side plate 22 located on the other side of the integrated electrode group along the second direction. The other side of the second docking member 233 is inserted into the first docking member 232 and has a second clearance notch 2331. The first clearance notch and the second clearance notch 2331 together form a receiving groove 231. By adopting a docking module 23 composed of a separate structure of the first docking member 232 and the second docking member 233, during assembly, the first docking member 232 can be inserted between two adjacent individual electrode groups 1 first, and then the second docking member 233 can be inserted between two adjacent individual electrode groups 1, thereby facilitating the installation of the docking module 23 between two adjacent individual electrode groups 1 and improving the ease of assembly.

[0049] In this embodiment, in order to reduce the number of parts and shorten the assembly time, the first docking part 232 and one of the protective side plates 22 are integrally formed by injection molding, and the second docking part 233 and the other protective side plate 22 are integrally formed by injection molding.

[0050] Optionally, such as Figure 2 , Figure 3 As shown, one of the first mating member 232 and the second mating member 233 is provided with an insertion protrusion, and the other of the first mating member 232 and the second mating member 233 is provided with an insertion hole 2332. The insertion protrusion is inserted into the insertion hole 2332. By providing an insertion protrusion in one of the first mating members 232 and the second mating member 233, and providing an insertion hole 2332 in the other of the first mating member 232 and the second mating member 233, the assembly of the first mating member 232 and the second mating member 233 is completed through the insertion of the insertion protrusion and the insertion hole 2332. This connects the protective side plates 22 located on both sides of the integrated electrode assembly along the second direction into a whole, thereby improving the protection of the integrated electrode assembly and enhancing the structural strength of the integrated electrode assembly. In this embodiment, the insertion protrusion is provided on the first mating member 232, and the insertion hole 2332 is provided on the second mating member 233. The shape of the insertion protrusion is adapted to the shape of the insertion hole 2332, and its cross-sectional shape can be circular, elliptical, or polygonal.

[0051] Optionally, such as Figure 4 , Figure 5As shown, the protective end plate 21 has slots 212 on both sides along the second direction. The protective side plate 22 also includes a protective part 221 and a limiting part 222. The limiting part 222 is located on both sides of the protective part 221 along the first direction and is perpendicular to the protective part 221. The protective part 221 is attached to one side of the integrated electrode assembly along the second direction and is embedded in the slot 212. By opening slots 212 on both sides of the protective end plate 21 along the second direction, the protective part 221 of the protective side plate 22 is embedded in the slot 212, and the limiting part 222 abuts against the side of the protective end plate 21 away from the integrated electrode assembly. This connects the protective end plate 21 on both sides of the integrated electrode assembly along the first direction and the protective side plate 22 on both sides of the second direction into a whole. This achieves four-sided protection of the integrated electrode assembly and improves the overall structural strength of the integrated electrode assembly.

[0052] Optionally, such as Figure 4 As shown, the protective portion 221 has at least one vent 223. By providing at least one vent 223 on the protective portion 221, the area of ​​the integrated electrode assembly shielded by the protective portion 221 can be easily released when gas is generated. In this embodiment, the number and shape of the vent 223 on the protective portion 221 can be freely set according to requirements.

[0053] Optionally, such as Figure 2 , Figure 8 As shown, the battery also includes a casing 3 and a cover plate 4. The casing 3 is a hollow shell structure with openings at both ends. The cover plate 4 is placed over the openings at both ends of the casing 3 to form a cavity for accommodating the integrated electrode assembly and the protective frame 2. The cover plate 4 is made of aluminum single plate, and the tabs 11 passing through the through holes 211 on the protective end plate 21 are connected to the cover plate 4 made of aluminum single plate. By directly connecting the tabs 11 passing through the through holes 211 on the protective end plate 21 to the cover plate 4 made of aluminum single plate, compared with the cover plate assembly of traditional batteries, a large number of parts are saved, the assembly difficulty and manufacturing cost are reduced, and it cooperates with the protective frame 2 made of plastic material to ensure insulation safety.

[0054] Optionally, such as Figure 2 , Figure 8 , Figure 9 As shown, the battery also includes at least one explosion-proof valve 5 and a protective patch 6 corresponding to each explosion-proof valve 5. At least one explosion-proof valve 5 is disposed on the outer casing 3, and protective patches 6 are provided on the inner side of each location on the outer casing 3 where the explosion-proof valve 5 is located. By providing at least one explosion-proof valve 5 on the outer casing 3, after prolonged cyclic use, the generated pressurized gas can be released into the external environment by its own pressure, thus achieving the purpose of pressure relief protection. Furthermore, the protective patches 6 on the inner side of each location on the outer casing 3 where the explosion-proof valve 5 is located prevent damage caused by scratching between the explosion-proof valve 5 and the integrated electrode assembly located inside the outer casing 3, thereby simultaneously protecting both.

[0055] The number and position of the explosion-proof valves 5 installed on the outer shell 3 can be freely set according to the number of individual electrode groups 1 constituting the integrated electrode group. In this embodiment, since the integrated electrode group is composed of two individual electrode groups 1, a total of four explosion-proof valves 5 are provided on the outer shell 3. Two explosion-proof valves 5 are installed on the same side of the outer shell 3 along the second direction, and two are installed on both sides of the outer shell 3 along the third direction, corresponding to the welding points of the positive and negative electrode tabs of the two individual electrode groups 1.

[0056] Optionally, such as Figure 7 As shown, a weakening structure 61 is provided on the protective patch 6. By providing the weakening structure 61 on the protective patch 6, it is easier for pressurized gas to break through the protective patch 6 and apply pressure to the explosion-proof valve 5. The weakening structure 61 can be a hole-type structure or a groove-type structure. In this embodiment, the weakening structure 61 is a groove.

[0057] Optionally, such as Figure 6 As shown, the cover plate 4 has a boss structure 41 that protrudes outward from the integrated electrode assembly. By providing the boss structure 41 on the cover plate 4, it is convenient for the cover plate 4 to connect with external devices, which is equivalent to the pole post in a traditional cover plate assembly. In this embodiment, the boss structure 41 on the cover plate 4 is manufactured by a stamping process.

[0058] In this embodiment, a battery module is also provided, which includes multiple batteries as described above. By using the batteries described above, the battery module effectively reduces the probability of failure due to the internal power battery, thereby extending the service life of the battery module, due to the superior product quality of these batteries.

[0059] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A battery, characterized in that, The battery includes: An integrated electrode group includes multiple individual electrode groups arranged linearly along a first direction. Each individual electrode group has tabs on both sides along the first direction, and the tabs of two adjacent individual electrode groups are welded together. A protective frame includes protective end plates, protective side plates, and docking modules. The protective end plates are located on both sides of the integrated electrode assembly along the first direction and have through holes for the electrode tabs to pass through. The protective side plates are located on both sides of the integrated electrode assembly along the second direction and are respectively engaged with the protective end plates located on both sides of the integrated electrode assembly along the first direction. A docking module is provided between each pair of adjacent individual electrode assemblies. The docking module is respectively engaged with the protective side plates located on both sides of the integrated electrode assembly along the second direction. The docking module has a receiving groove, in which the electrode tabs of two adjacent individual electrode assemblies after welding are accommodated.

2. The battery according to claim 1, characterized in that, The docking module includes a first docking member and a second docking member. One side of the first docking member is connected to the protective side plate located on one side of the integrated electrode group along the second direction. The other side of the first docking member is inserted into the second docking member and has a first clearance notch. One side of the second docking member is connected to the protective side plate located on the other side of the integrated electrode group along the second direction. The other side of the second docking member is inserted into the first docking member and has a second clearance notch. The first clearance notch and the second clearance notch together form the receiving groove.

3. The battery according to claim 2, characterized in that, One of the first and second docking parts is provided with a plugging protrusion, and the other of the first and second docking parts is provided with a plugging hole, wherein the plugging protrusion is inserted into the plugging hole.

4. The battery according to claim 1, characterized in that, The protective end plate has slots on both sides along the second direction. The protective side plate also includes a protective part and a limiting part. The limiting part is located on both sides of the protective part along the first direction and is perpendicular to the protective part. The protective part is attached to one side of the integrated electrode assembly along the second direction and is embedded in the slot.

5. The battery according to claim 4, characterized in that, The protective part is provided with at least one vent hole.

6. The battery according to claim 1, characterized in that, The battery also includes a casing and a cover plate. The casing is a hollow shell structure with open ends. The cover plate is placed over the open ends of the casing to form a cavity for accommodating the integrated electrode assembly and the protective frame. The cover plate is an aluminum single plate. The electrode tabs passing through the through holes on the protective end plate are connected to the cover plate made of aluminum single plate.

7. The battery according to claim 6, characterized in that, The battery also includes at least one explosion-proof valve and a protective patch corresponding to each explosion-proof valve. At least one explosion-proof valve is provided on the housing, and the protective patch is provided on the inner side of the housing where the explosion-proof valve is located.

8. The battery according to claim 7, characterized in that, The protective patch has a weakening structure.

9. The battery according to claim 6, characterized in that, The cover plate is provided with a boss structure that protrudes outward from the integrated electrode group.

10. A battery module, characterized in that, The battery module includes a plurality of batteries as described in any one of claims 1-9.

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