Square lithium ion battery support integrated cover plate and square lithium ion battery

Abstract

The embodiment of the utility model provides a square lithium ion battery bracket integrated cover plate and a square lithium ion battery, and belongs to the technical field of lithium batteries. The support integrated cover plate comprises a cover plate, the lower end face of the cover plate is provided with pole columns, and the pole columns comprise a positive pole column and a negative pole column; the first support is arranged above the cover plate, and the upper end face of the first support is provided with a circular fixing piece protruding upwards; the second support is arranged above the first support in an axial symmetry mode, a connecting and inserting hole is formed in the side, close to the symmetry axis, of the second support, and the circular fixing piece is clamped into the connecting and inserting hole so as to connect the second support and the first support. According to the lithium ion battery, the production process is optimized, the material utilization rate is improved, and the bearable vibration amplitude of the lithium ion battery is improved, so that a series of risks such as internal short circuit, open circuit and quick electrical property attenuation of the lithium ion battery are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, and in particular to a square lithium-ion battery bracket integrated cover plate and a square lithium-ion battery. Background Art

[0002] Lithium-ion batteries are widely used in various fields of daily life, and the requirements for lithium-ion battery life, rate performance, high and low temperature discharge, self-discharge and other performance are getting higher and higher. At the same time, given the complexity of the actual use conditions of lithium-ion batteries, whether lithium-ion batteries can withstand the impact of vibration on the normal operation of lithium-ion batteries is an important issue in the current lithium battery manufacturing field.

[0003] The existing lithium-ion bracket integrated cover plate used to use a cover plate, a fixed bracket and a retaining frame to match each other. The internal battery cells of the battery are supported under the cover plate by the bracket to prevent the battery cells from vibrating and shifting. However, the actual retaining frame installation process in the production process is easy to damage the battery cells, resulting in a waste of manufacturing costs. At the same time, due to the small support area during use, the vibration amplitude that the lithium-ion battery can withstand is limited. Utility Model Content

[0004] The utility model provides a square lithium-ion battery support integrated cover plate and a square lithium-ion battery, which solves the problem that the vibration amplitude that the lithium-ion battery can withstand is limited.

[0005] In order to achieve the above-mentioned object, the utility model provides, on one hand, a square lithium-ion battery bracket integrated cover plate, the bracket integrated cover plate comprising:

[0006] A cover plate, wherein a pole is disposed on the lower end surface of the cover plate, and the pole includes a positive pole and a negative pole;

[0007] A first bracket is arranged above the cover plate, and an upper end surface of the first bracket is provided with a circular fixing piece protruding upward;

[0008] The second bracket is axially symmetrically arranged above the first bracket. A connector hole is arranged on one side of the second bracket close to the axis of symmetry. The connector hole is inserted into the circular fixing piece to connect the second bracket and the first bracket.

[0009] Optionally, the bracket integrated cover plate includes a connecting piece, which is arranged between the first bracket and the second bracket, and the connecting piece includes:

[0010] A positive electrode connecting piece, arranged directly above the positive electrode column;

[0011] The negative electrode connecting piece is arranged just above the negative electrode column.

[0012] Optionally, the cover plate, the first bracket, the pole and the connecting piece are connected by rivets, and the cover plate, the first bracket, the pole and the connecting piece are respectively provided with a first through hole, a second through hole, a third through hole and a fourth through hole for the rivets to pass through.

[0013] Optionally, a first groove recessed inwardly is provided on the lower end surface of the second bracket, and the top of the rivet is embedded in the groove.

[0014] Optionally, both ends and the center of the first bracket are hollow structures of hole-shaped support columns.

[0015] Optionally, the cover plate body has a liquid injection hole penetrating along the thickness direction thereof.

[0016] Optionally, an explosion-proof valve is provided in the middle of the cover plate body, and an explosion-proof membrane is provided on the top of the explosion-proof valve.

[0017] Optionally, a sealing ring is provided between the pole and the cover plate, and the material of the sealing ring is PP.

[0018] Optionally, the material of the positive electrode column is aluminum, the material of the negative electrode column is copper-aluminum composite, the material of the first bracket is PP, and the material of the second bracket is HJ400;

[0019] The connecting piece and the rivet are made of nickel-plated copper.

[0020] On the other hand, the utility model provides a prismatic lithium-ion battery, wherein the prismatic lithium-ion battery comprises a prismatic lithium-ion battery body and a bracket-integrated cover plate as described in any one of the above items.

[0021] Through the above technical solution, the utility model provides a square lithium-ion battery bracket integrated cover plate and a square lithium-ion battery, the bracket integrated cover plate includes a cover plate, a first bracket and a second bracket, the second bracket and the first bracket are connected by inserting the socket on the second bracket into the circular fixing piece on the first bracket, and the cover plate, the first bracket, the pole and the connecting piece are connected by rivets. Compared with the prior art, the utility model improves the material utilization rate and increases the vibration amplitude that the lithium-ion battery can withstand, thereby avoiding a series of risks such as internal short circuit, open circuit, and rapid electrical performance degradation of the lithium-ion battery.

[0022] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide a further understanding of the embodiments of the present utility model and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present utility model, but do not constitute a limitation on the embodiments of the present utility model. In the accompanying drawings:

[0024] Figure 1 is an exploded view of an integrated bracket according to one embodiment of the utility model;

[0025] Figure 2 is a schematic diagram of a second bracket according to an embodiment of the present utility model;

[0026] Figure 3 It is a schematic diagram of a partial structure according to an embodiment of the utility model.

[0027] Description of Reference Numerals

[0028] 1. Cover plate 2. Pole

[0029] 21. Positive pole 22. Negative pole

[0030] 3. First bracket 31, circular fixing member

[0031] 4. Second bracket 41, socket

[0032] 5. Connecting piece 51. Positive connecting piece

[0033] 52. Negative electrode connecting piece 6. Rivet

[0034] 11. first through hole 21. second through hole

[0035] 32, third through hole 53, fourth through hole

[0036] 42. first groove 12, injection hole

[0037] 13. Explosion-proof valve DETAILED DESCRIPTION

[0038] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0039] In the embodiments of the present invention, unless otherwise specified, directional words such as "up, down, top, bottom" are usually used with reference to the directions shown in the drawings or are used to describe the relative positional relationships of components in the vertical, perpendicular or gravity direction.

[0040] In addition, if there are descriptions involving "first", "second", etc. in the implementation of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various implementations can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0041] Figure 1 It is a schematic diagram of a bracket integrated cover according to an embodiment of the utility model, in which the bracket integrated cover includes a cover 1, a first bracket 3 and a second bracket 4. Among them, the lower end surface of the cover 1 is provided with a pole 2, and the pole 2 includes a positive pole 212 and a negative pole 222. The first bracket 3 is arranged above the cover 1, and the upper end surface of the first bracket 3 is provided with a circular fixing member 31 protruding upward. The second bracket 4 is axially symmetrically arranged above the first bracket 3, and the second bracket 4 is provided with a socket 41 on one side close to the symmetry axis. By clamping the socket 41 into the circular fixing member 31 to connect the second bracket 4 and the first bracket 3, loosening and falling off are avoided after clamping to improve the stability of the device. The battery cell is placed on both sides of the first bracket 3. The utility model increases the contact area between the bracket and the battery cell, adjusts the bracket support angle and support mode, and the bracket integrated cover enhances the vibration resistance of the lithium electronic battery, thereby avoiding a series of risks such as internal short circuit, open circuit, and rapid electrical performance decay of the lithium ion battery.

[0042] In this embodiment, the specific structure of the bracket integrated cover plate can be various known to those skilled in the art. In one example of the present utility model, the bracket integrated cover plate includes a connecting piece 5, and the connecting piece 5 is arranged between the first bracket 3 and the second bracket 4. Among them, the positive electrode connecting piece 51 is arranged just above the positive electrode column 212, and the negative electrode connecting piece 52 is arranged just above the negative electrode column 222. The second bracket 4 can contact both ends of the positive electrode connecting piece 51 and the negative electrode connecting piece 52, and play a shaping role in the process of bending the connecting piece 5.

[0043] In this embodiment, the connection methods between the cover plate 1, the first bracket 3, the pole 2 and the connecting piece 5 can be various known to those skilled in the art, such as riveting and bolt connection. In one example of the utility model, the cover plate 1, the first bracket 3, the pole 2 and the connecting piece 5 can be connected by rivets 6. Accordingly, the cover plate 1, the pole 2, the first bracket 3 and the connecting piece 5 are respectively provided with a first through hole 11, a second through hole 21, a third through hole 32 and a fourth through hole 53 for the rivet 6 to pass through. The cover plate 1, the pole 2, the first bracket 3 and the connecting piece 5 form an integrated structure through the rivet 6, which is low in cost and efficient in the installation process, saving time and labor costs.

[0044] In this embodiment, there are many ways to fix the rivet 6 known to those skilled in the art. In one example of the present invention, for example Figure 2 As shown, the lower end surface of the second bracket 4 is provided with a first groove 42 which is recessed inwardly, and the top of the rivet 6 is embedded in the first groove 42. By fixing the relative position of the rivet 6 in the integrated cover of the bracket, the vibration resistance of the lithium-ion battery is further enhanced.

[0045] In this embodiment, in order to reduce the weight of the first bracket 3, a hollow structure is provided on the first bracket 3. As for the position of the hollow structure, it can be a variety of structures known to those skilled in the art, provided that weight reduction is achieved. In one example of the present utility model, both ends and the center of the first bracket 3 are hollow structures of hole-shaped support columns. The hollow structure can store electrolyte, and during the process of injecting liquid into the battery cell, the electrolyte stationary in the hollow structure can slowly infiltrate the battery cell. During the battery assembly process, the positive and negative pole ears of the battery cell are respectively placed in the middle of the two layers of positive and negative electrode connecting sheets 52, and after being fixed by ultrasonic welding, the positive and negative electrode connecting sheets 52 are bent along the edge of the second bracket 4 and then pressed down, so that the two ends of the first bracket 3 and the center of the hole-shaped support column can support the battery cell, thereby supporting and fixing the battery cell.

[0046] In this embodiment, considering the need to inject liquid into the battery cell, such as Figure 3 As shown, the cover plate 1 has a liquid injection hole 12 penetrating along the thickness direction thereof.

[0047] In this embodiment, the cover plate 1 body is provided with an explosion-proof valve 13. The position of the explosion-proof valve 13 on the cover plate 1 can be various positions known to those skilled in the art. In one example of the present invention, the explosion-proof valve 13 can be provided in the middle of the cover plate 1, and an explosion-proof membrane is provided on the top of the explosion-proof valve 13. The explosion-proof valve 13 can rupture when the internal pressure of the battery is too high to prevent the battery from exploding or other dangers.

[0048] In this embodiment, considering the need to ensure the sealing of the device, a sealing ring is provided between the pole 2 and the cover plate 1. The material of the sealing ring can be a variety of materials known to those skilled in the art. In one example of the present utility model, in order to ensure the insulation effect, the material of the sealing ring is PP. The sealing ring can insulate the positive and negative poles 222 from the cover plate 1 to avoid a series of safety issues such as battery short circuit.

[0049] In this embodiment, the material of the first bracket 3 and the second bracket 4 can be a variety known to those skilled in the art. In one example of the present utility model, in order to further ensure the insulation of the bracket integrated cover, the first bracket 3 is made of black PP material with low specific gravity, high strength, corrosion resistance and good insulation performance, and the second bracket 4 is made of black HJ400 material with high strength, corrosion resistance and good insulation. The first bracket 3 and the second bracket 4 are both processed by arc grinding to avoid burrs and flash causing internal short circuits and open circuits. Furthermore, the material of the positive pole 212 is aluminum, the material of the negative pole 222 is a copper-aluminum composite material, and the material of the connecting piece 5 and the rivet 6 is nickel-plated copper.

[0050] Through the above technical solution, the utility model provides a square lithium-ion battery bracket integrated cover plate and a square lithium-ion battery, the bracket integrated cover plate includes a cover plate, a first bracket 3 and a second bracket 4, the second bracket 4 and the first bracket 3 are connected by inserting the socket 41 on the second bracket 4 into the circular fixing piece 31 on the first bracket 3, and the cover plate, the first bracket 3, the pole and the connecting piece 5 are connected by rivets 6. Compared with the prior art, the utility model improves the material utilization rate and the vibration amplitude that the lithium-ion battery can withstand, thereby avoiding a series of risks such as internal short circuit, open circuit, and rapid electrical performance degradation of the lithium-ion battery.

[0051] On the other hand, the utility model provides a prismatic lithium-ion battery, which comprises a prismatic lithium-ion battery body and a bracket-integrated cover plate as described in any one of the above items.

[0052] Through the above technical solution, the utility model provides a square lithium-ion battery bracket integrated cover plate and a square lithium-ion battery, the bracket integrated cover plate includes a cover plate, a first bracket and a second bracket, the second bracket and the first bracket are connected by inserting the socket on the second bracket into the circular fixing piece on the first bracket, and the cover plate, the first bracket, the pole and the connecting piece are connected by rivets. Compared with the prior art, the utility model improves the material utilization rate and increases the vibration amplitude that the lithium-ion battery can withstand, thereby avoiding a series of risks such as internal short circuit, open circuit, and rapid electrical performance degradation of the lithium-ion battery.

[0053] The optional implementation modes of the utility model examples are described in detail above in conjunction with the accompanying drawings. However, the implementation modes of the utility model are not limited to the specific details in the above implementation modes. Within the technical concept of the implementation modes of the utility model, various simple modifications can be made to the technical solutions of the implementation modes of the utility model. These simple modifications all belong to the protection scope of the implementation modes of the utility model.

[0054] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the various possible combinations of the embodiments of the present utility model will not be described separately.

[0055] In addition, various different embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed in the embodiments of the present invention.

Claims

1. A square lithium-ion battery bracket integrated cover plate, characterized in that: The bracket integrated cover plate comprises: A cover plate, wherein a pole is disposed on the lower end surface of the cover plate, and the pole includes a positive pole and a negative pole; A first bracket is arranged above the cover plate, and an upper end surface of the first bracket is provided with a circular fixing piece protruding upward; The second bracket is axially symmetrically arranged above the first bracket. A connector hole is arranged on one side of the second bracket close to the axis of symmetry. The connector hole is inserted into the circular fixing piece to connect the second bracket and the first bracket.

2. The bracket integrated cover plate according to claim 1, characterized in that: The bracket integrated cover plate includes a connecting piece, which is arranged between the first bracket and the second bracket, and the connecting piece includes: A positive electrode connecting piece, arranged directly above the positive electrode column; The negative electrode connecting piece is arranged just above the negative electrode column.

3. The bracket integrated cover plate according to claim 2, characterized in that: The cover plate, the first bracket, the pole and the connecting piece are connected by rivets, and the cover plate, the pole, the first bracket and the connecting piece are respectively provided with a first through hole, a second through hole, a third through hole and a fourth through hole for the rivets to pass through.

4. The bracket integrated cover plate according to claim 3, characterized in that: The lower end surface of the second bracket is provided with a first groove recessed inwardly, and the top of the rivet is embedded in the first groove.

5. The bracket integrated cover plate according to claim 1, characterized in that: Both ends and the center of the first bracket are hollow structures of hole-shaped support columns.

6. The bracket integrated cover plate according to claim 1, characterized in that: The cover plate body has a liquid injection hole penetrating along the thickness direction thereof.

7. The bracket integrated cover plate according to claim 1, characterized in that: An explosion-proof valve is arranged in the middle of the cover plate body, and an explosion-proof membrane is arranged on the top of the explosion-proof valve.

8. The bracket integrated cover plate according to claim 1, characterized in that: A sealing ring is arranged between the pole and the cover plate, and the material of the sealing ring is PP.

9. The bracket integrated cover plate according to claim 3, characterized in that: The material of the positive electrode column is aluminum, the material of the negative electrode column is copper-aluminum composite, the material of the first bracket is PP, and the material of the second bracket is HJ400; The connecting piece and the rivet are made of nickel-plated copper.

10. A prismatic lithium-ion battery, characterized in that: The prismatic lithium-ion battery comprises a prismatic lithium-ion battery body and a bracket-integrated cover plate as described in any one of claims 1 to 9.

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