Battery shell, battery and electric equipment

Abstract

The utility model relates to a battery shell, a battery and electric equipment, the battery shell comprises a shell and a cover plate, the shell is provided with an opening, the cover plate covers the opening, the side wall of the shell is provided with a liquid injection hole, and the side wall of the shell is at least provided with a reinforcing structure at a position corresponding to the liquid injection hole for reinforcing the strength of the liquid injection hole. According to the technical scheme, when the battery is subjected to expansion stress generated in the cycle process of the battery cell, the liquid injection hole is not easy to deform due to the fixed protection of the reinforcing structure on the liquid injection hole, so that the sealing performance of the liquid injection hole is ensured, the risk of liquid leakage of the battery is favorably avoided, and the safety performance of the battery in use is improved.

Description

Technical Field

[0001] The present disclosure relates to the field of new energy technology, and in particular to a battery casing, a battery and an electrical device. Background Art

[0002] The injection hole of the battery electrolyte, as well as the pole and explosion-proof valve, are usually set together on the cover of the shell. Due to the working height of the injection equipment and other reasons, some related technologies choose to set the injection hole on the side wall of the shell, and the shell is usually made of thinner aluminum material, which is weaker than the cover. In the cycle of the battery cell, as the battery cell continues to expand, the side of the aluminum shell generates tensile stress, which easily causes the position of the injection hole to deform, resulting in poor sealing performance and the risk of leakage, affecting the safety performance of the battery. Utility Model Content

[0003] In order to overcome the problems existing in the related art, the present disclosure provides a battery housing, a battery and an electrical device.

[0004] According to a first aspect of an embodiment of the present disclosure, a battery casing is provided, comprising a shell and a cover plate, wherein the shell has an opening, the cover plate is arranged to cover the opening, and the side wall of the shell is provided with an injection hole, wherein the side wall of the shell is provided with a reinforcing structure at least at a position corresponding to the injection hole, so as to strengthen the strength of the injection hole.

[0005] Optionally, a plurality of the liquid injection holes are provided, and the plurality of the liquid injection holes are provided on the same side wall of the shell.

[0006] Optionally, the battery housing further comprises a flexible sealing nail for inserting into the injection hole to seal the injection hole and a sealing cover sealing the outer side of the injection hole.

[0007] Optionally, the shell includes two first side walls arranged opposite to each other in a first direction and two second side walls arranged opposite to each other in a second direction, wherein an area of ​​the first side wall is smaller than an area of ​​the second side wall, and the injection hole is arranged on the first side wall.

[0008] Optionally, the sealing cover is configured not to protrude from the outer surface of the side wall.

[0009] Optionally, the reinforcement structure is a reinforcement plate abutting against the inner wall of the shell, the reinforcement plate is provided with a through hole, and the position of the through hole is aligned with the position of the injection hole.

[0010] Optionally, the cover plate and the reinforcement plate are of integral construction.

[0011] Optionally, a boss is provided on the side of the cover plate facing the interior of the shell, the outer periphery of the cover plate extends laterally beyond the boss, the outer wall surface of the boss is suitable for abutting against the inner wall surface of the shell, wherein the reinforcement plate is formed by extending from the side edge of the boss away from the cover plate.

[0012] Optionally, the reinforcement structure is a wall thickness reinforcement portion formed by increasing the wall thickness of the shell side wall.

[0013] According to a second aspect of an embodiment of the present disclosure, a battery is provided, comprising a battery housing and a pole core accommodated in the battery housing, wherein the battery housing is any one of the battery housings described above.

[0014] According to a third aspect of an embodiment of the present disclosure, there is provided an electrical device comprising the above-mentioned battery.

[0015] The technical solution provided by the embodiments of the present disclosure may include the following beneficial effects: the battery casing provided by the present disclosure is provided with a reinforcing structure on the side wall of the shell at least corresponding to the position of the injection hole, so as to strengthen the strength of the injection hole. In this way, when subjected to the expansion stress generated during the cycle of the battery cell, the injection hole is not easily deformed due to the fixed protection formed by the reinforcing structure on the injection hole, thereby ensuring the sealing performance of the injection hole, which is beneficial to avoiding the risk of battery leakage and improving the safety performance of battery use.

[0016] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0018] Figure 1 Schematic diagram of the structure of a battery housing provided in an exemplary embodiment of the present disclosure.

[0019] Figure 2 Schematic diagram of the structure of another battery housing provided by an exemplary embodiment of the present disclosure.

[0020] Figure 3 is a top view of a battery case provided according to an exemplary embodiment of the present disclosure.

[0021] Figure 4 is a schematic diagram of a cover plate provided according to an exemplary embodiment of the present disclosure.

[0022] Figure 5 is a schematic diagram of a battery provided according to an exemplary embodiment of the present disclosure.

[0023] Description of Reference Numerals

[0024] 1-shell, 11-opening, 12-liquid injection hole, 13-first side wall, 14-second side wall, 2-cover plate, 21-boss, 3-reinforcement structure, 31-reinforcement plate, 311-through hole, 41-flexible sealing nail, 42-sealing cover, 51-positive pole, 52-negative pole, 6-explosion-proof valve, 7-pole core. DETAILED DESCRIPTION

[0025] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0026] Unless otherwise specified, directional words such as "upper, lower, left, right" are defined according to the directions indicated in the corresponding drawings, while "inner" and "outer" refer to the inner and outer contours of the corresponding components themselves. In addition, the terms "first", "second", etc. used in this disclosure are to distinguish one element from another, and do not have order and importance.

[0027] like Figures 1 to 4 As shown, the present disclosure exemplarily provides a battery housing for accommodating a pole core 7 and an electrolyte. The battery housing includes a housing 1 and a cover plate 2, the housing 1 having an opening 11, the cover plate 2 covering the opening, the side wall of the housing 1 being provided with an injection hole 12, and the side wall of the housing 1 being provided with a reinforcing structure at least at a position corresponding to the injection hole 12, so as to strengthen the strength of the injection hole 12. Among them, the housing 1 can be constructed to have an opening 11 at one end or openings 11 at both ends, which is mainly determined by whether the positive pole column 51 and the negative pole column 52 are arranged at the same end of the battery. For example, in some batteries, the positive pole column 51 and the negative pole column 52 are respectively arranged at the two ends of the battery, so that the housing 1 needs to have openings 11 at both ends to facilitate the installation of the cover plate 2 respectively. For the assembly of the battery, the pole core 7 is usually first placed in the housing 1, and then the cover plate 2 is covered on the opening 11 and the opening 11 is closed, and finally the electrolyte is injected through the injection hole 12.

[0028] The battery housing 1 provided in the present disclosure is provided with a liquid injection hole 12 on the side wall of the housing 1, which is mainly different from the related art in which the liquid injection hole 12 is provided on the cover plate 2. The related art mainly provides the liquid injection hole 12 on the cover plate 2 because the cover plate 2 has a thicker wall thickness so as to provide sufficient strength to avoid deformation of the liquid injection hole 12. However, as the length of the battery continues to increase, for example, the length of a blade battery with higher efficiency can reach 90 cm, which is limited by the working height of the liquid injection equipment.

[0029] The present invention sets the injection hole 12 on the side wall of the shell 1, so that the battery shell can be placed horizontally on the injection station during the injection process, so that it is less affected by the working height of the injection equipment. At the same time, compared with the vertical injection method, the pole core 7 is not greatly affected by gravity when the battery is placed horizontally, so the tensile stress on the side wall of the shell 1 is also smaller. This can minimize the risk of deformation of the injection hole 12 at least in the injection stage.

[0030] On this basis, the present disclosure provides a reinforcing structure 3 at least at the position corresponding to the injection hole 12 on the side wall of the shell 1. The reinforcing structure 3 here can, for example, adopt an additional reinforcing member, or thicken the side wall of the shell 1 partially or as a whole, or adopt reinforcing ribs and other methods to strengthen the strength of the injection hole 12. These will be described in more detail later and will not be repeated here. By providing a reinforcing structure 3 to strengthen the strength of the injection hole 12, when subjected to the expansion stress generated during the battery cell cycle, the reinforcing structure provides fixed protection for the injection hole 12, so that the injection hole 12 is not easily deformed, thereby ensuring the sealing performance of the injection hole, which is conducive to avoiding the risk of battery leakage and improving the safety performance of battery use.

[0031] The technical solution provided by the embodiments of the present disclosure may include the following beneficial effects: the battery casing provided by the present disclosure is provided with a reinforcing structure 3 on the side wall of the shell 1 at least corresponding to the position of the injection hole 12, so as to strengthen the strength of the injection hole 12, so that when subjected to the expansion stress generated during the cycle of the battery cell, the injection hole 12 is not easily deformed due to the fixed protection formed by the reinforcing structure on the injection hole 12, thereby ensuring the sealing performance of the injection hole 12, which is beneficial to avoiding the risk of battery leakage and improving the safety performance of battery use.

[0032] In some embodiments, Figure 3 As shown, multiple injection holes 12 can be provided, and multiple injection holes 12 are provided on the same side wall of the housing 1. Take the housing 1 having openings 11 at both ends as an example, that is, cover plates 2 are respectively provided at the openings 11 at both ends of the housing 1 to lead out the positive electrode and the negative electrode respectively, wherein, Figure 1 It is shown that a positive electrode column 51 is provided on the cover plate 2. Figure 2It is shown that the negative pole 52 and the explosion-proof valve 6 are arranged on the cover plate 2. Figures 1 to 3 In the embodiment, the injection hole 12 can be arranged at a position close to the cover plate 2. Of course, according to actual needs, the injection hole 12 can also be arranged at any position between the two ends of the shell side wall.

[0033] By providing a plurality of injection holes 12, for example, Figure 3 An embodiment is shown in which two injection holes 12 are provided, and both injection holes 12 are provided on the same side wall of the shell 1. This allows the injection device to complete the injection operation on one side of the shell 1, without the need to configure the injection device on the other side of the shell 1 or flip the shell after injection on one side to perform the injection operation on the other side. This is beneficial to improving the efficiency of injection and reducing the time of electrolyte infiltration, making the infiltration more sufficient.

[0034] After the injection operation is completed, in order to seal the injection hole, Figure 1 and Figure 2 As shown, the battery housing may also include a flexible sealing nail 41 for inserting into the injection hole 12 to seal the injection hole 12 and a sealing cover 42 covering the outside of the injection hole 12. The flexible sealing nail 41 may be, for example, a sealing nail made of rubber material, which is sealed in the injection hole 12 by flexible deformation to prevent leakage. The sealing cover 42 is usually welded to the outside of the injection hole 12, and cooperates with the flexible sealing nail 41 to enhance the sealing effect and prevent dust from falling into the injection hole 12. Optionally, the sealing cover 42 may be configured not to protrude from the outer surface of the side wall, which may be achieved by adopting a flat sealing cover 42 or increasing the depth of the injection hole 12, as long as there is no installation interference with the flexible sealing nail 41, which can ensure the flatness of the side wall and be more beautiful in appearance.

[0035] In addition, if Figures 1 to 3 As shown, the housing 1 includes two first side walls 13 arranged opposite to each other in the first direction and two second side walls 14 arranged opposite to each other in the second direction, wherein the area of ​​the first side wall 13 is smaller than the area of ​​the second side wall 14, and the injection hole 12 is arranged on the first side wall 13. Taking a square battery as an example, the first side wall 13 is the narrow top surface or narrow bottom surface of the battery, and the second side wall 13 is the large surface of the battery generally referred to, which is also the surface against which the batteries are stacked into groups. The present disclosure arranges the injection hole 12 on the first side wall 13 mainly to avoid affecting the stacking of batteries and save stacking space.

[0036] As an implementation method of the aforementioned reinforcement structure 3, the reinforcement structure 3 is a reinforcement plate 31 abutting against the inner wall of the shell 1, and the reinforcement plate 31 is provided with a through hole 311, and the position of the through hole 311 is aligned with the position of the injection hole 12. It should be noted that the alignment of the through hole 311 and the injection hole 12 referred to here means that the centers of the two circles coincide, so as to ensure that the flexible sealing nail 41 and other seals can be inserted in sequence. The reinforcement plate 31 can not only play a role in strengthening the strength of the injection hole 12, but also increase the wall thickness of the shell 1 at the position of the injection hole 12, thereby forming a "heat dissipation belt" inside the battery, that is, the heat generated inside the battery can be conducted outward through the added reinforcement plate 31, which is beneficial to the heat dissipation of the battery cell, and improves the safety performance of the battery without affecting the energy density. In order not to affect the battery energy density and consider the lightweight design of the battery, the thickness of the reinforcement plate 31 is slightly greater than the wall thickness of the shell 1. For example, the shell thickness of aluminum material is usually 0.3mm-0.5mm. After adding the reinforcement plate 31, the total thickness is preferably not more than 1mm.

[0037] The cover plate 2 and the reinforcing plate 31 may be configured as an integral structure, for example, Figure 4 The L-shaped cover plate 2 is shown in the figure. Specifically, the reinforcing plate 31 can be regarded as a part of the cover plate 2, which can be achieved by integrally injecting the reinforcing plate 31 when manufacturing the cover plate 2. Of course, the reinforcing plate 31 can also be integrally formed on the cover plate 2 by welding or the like on the basis of the existing flat cover plate. The cover plate 2 and the reinforcing plate 31 are constructed as an integral part, so as to reduce the purpose of parts to be installed, and the reinforcing plate 31 can be installed while the cover plate 2 is installed, which is beneficial to improve the efficiency of installation. The length of the reinforcing plate 31 can be slightly longer than the position of the injection hole 12, for example, more than 3mm-5mm, and the position of the injection hole 12 can be based on actual conditions as long as it does not interfere with the top spacer. A shorter reinforcing plate 31 can improve the strength without excessively increasing the weight of the battery.

[0038] Further, a boss 21 is provided on the side of the cover plate 2 facing the inside of the shell 1, and the outer periphery of the cover plate 2 extends laterally beyond the boss 21, and the outer wall surface of the boss 21 is suitable for abutting against the inner wall surface of the shell 1, wherein the reinforcing plate 31 is formed by extending the side edge of the boss 21 in a direction away from the cover plate 2. The outer wall surface of the boss 21 is suitable for abutting against the inner wall surface of the shell 1, and plays a role of installation guide, so as to improve the installation efficiency of the cover plate 2, and the outer periphery of the cover plate 2 extends laterally beyond the boss 21, so that a lap joint surface is formed between the cover plate 2 and the boss 21, and the lap joint surface is used to overlap the end edge of the shell, and then the cover plate 2 can be welded to the shell 1. Since the reinforcing plate 31 is formed by extending from the side edge of the boss 21 in a direction away from the cover plate 2, and since the outer wall surface of the boss 21 is suitable for abutting against the inner wall surface of the shell 1, the position of the extending reinforcing plate 31 can abut against the inner wall surface of the shell 1.

[0039] In addition to the aforementioned implementation of additionally setting a reinforcing plate 31 as the reinforcing structure 3, in other implementations, the reinforcing structure 3 may also be a wall thickness reinforcement portion formed by increasing the wall thickness of the side wall of the shell 1. The wall thickness reinforcement portion may, for example, be a local thickening of the position of the injection hole 12, or the entire side wall may be thickened, wherein the entire side wall thickening is relatively simple in the manufacturing process, while the local thickening, for example, achieved by injection molding, is conducive to achieving structural strength while reducing the adverse effect on the overall weight of the battery. In addition, a plurality of reinforcing ribs may also be injection-molded at intervals around the injection hole 12 on the inner wall of the shell 1, which also has the function of strengthening the structural strength of the injection hole 12.

[0040] According to a second aspect of the embodiment of the present disclosure, Figure 5 As shown, a battery is also provided, including a battery casing and a pole core 7 accommodated in the battery casing. The battery casing is the battery casing in any one of the above-mentioned embodiments and has all its beneficial effects, which will not be repeated here.

[0041] According to a third aspect of the embodiments of the present disclosure, there is also provided an electric device, such as a pure electric vehicle, which includes the above-mentioned battery.

[0042] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0043] 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 present disclosure will not further describe various possible combinations.

[0044] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A battery casing, characterized in that: The invention comprises a shell and a cover plate, wherein the shell has an opening, the cover plate is arranged to cover the opening, and the side wall of the shell is provided with a liquid injection hole, wherein the side wall of the shell is provided with a reinforcing structure at least at a position corresponding to the liquid injection hole to strengthen the strength of the liquid injection hole.

2. The battery housing according to claim 1, characterized in that: There are multiple injection holes, and the multiple injection holes are arranged on the same side wall of the shell.

3. The battery housing according to claim 1, characterized in that: It also includes a flexible sealing nail used for inserting into the injection hole to seal the injection hole and a sealing cover sealing the outer side of the injection hole.

4. The battery housing according to claim 3, characterized in that: The shell includes two first side walls arranged opposite to each other in a first direction and two second side walls arranged opposite to each other in a second direction, wherein the area of ​​the first side wall is smaller than that of the second side wall, and the injection hole is arranged on the first side wall.

5. The battery housing according to claim 3, characterized in that: The sealing cover is configured not to protrude from the outer surface of the side wall.

6. The battery casing according to any one of claims 1 to 5, characterized in that: The reinforcement structure is a reinforcement plate attached to the inner wall of the shell, and the reinforcement plate is provided with a through hole, and the position of the through hole is aligned with the position of the injection hole.

7. The battery casing according to claim 6, characterized in that: The cover plate and the reinforcement plate are of integral structure.

8. The battery casing according to claim 7, characterized in that: A boss is provided on the side of the cover plate facing the interior of the shell, the outer periphery of the cover plate extends laterally beyond the boss, the outer wall surface of the boss is suitable for abutting against the inner wall surface of the shell, wherein the reinforcing plate is formed by extending from the side edge of the boss away from the cover plate.

9. The battery casing according to any one of claims 1 to 5, characterized in that: The reinforcement structure is a wall thickness reinforcement portion formed by increasing the wall thickness of the shell side wall.

10. A battery, characterized in that: It comprises a battery shell and a pole core accommodated in the battery shell, and the battery shell is the battery shell according to any one of claims 1 to 9.

11. An electrical device, characterized in that: Comprising the battery as claimed in claim 10.

Images