battery

Abstract

This invention relates to the field of battery technology and proposes a battery comprising a first casing, the first casing including: a first metal component; and a second metal component disposed within the first metal component, such that the first metal component forms the outer surface of the first casing, and the second metal component forms the inner surface of the first casing. The materials of the first metal component and the second metal component are different. The corrosion potential of the second metal component is higher than that of the first metal component, and the corrosion potential of the second metal component is higher than that of the negative electrode of the battery. This prevents electrochemical corrosion of the second metal component, thereby improving the service life of the first casing and ensuring its safety performance, thus improving the safe operation of the battery.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more particularly to a battery. Background Technology

[0002] In related technologies, battery casings are generally made of aluminum. Compared with other metal composite casings, aluminum casings are less expensive and easier to form. However, aluminum casings are prone to electrochemical corrosion during use. Summary of the Invention

[0003] This invention provides a battery to improve battery performance.

[0004] This invention provides a battery, including a first housing, the first housing comprising:

[0005] First metal component;

[0006] The second metal component is disposed inside the first metal component, such that the first metal component forms the outer surface of the first housing, and the second metal component forms the inner surface of the first housing. The materials of the first metal component and the second metal component are not the same.

[0007] The corrosion potential of the second metal component is higher than that of the first metal component, and the corrosion potential of the second metal component is higher than that of the negative electrode of the battery.

[0008] The battery of this invention includes a first casing. By configuring the first casing as a first metal component and a second metal component, with the second metal component disposed within the first metal component, the first metal component forms the outer surface of the first casing, and the second metal component forms the inner surface of the first casing. The corrosion potential of the second metal component is higher than that of the first metal component and higher than the negative electrode potential of the battery. That is, the corrosion potential of the second metal component is relatively high, which can prevent electrochemical corrosion of the second metal component, thereby improving the service life of the first casing and ensuring the safety performance of the first casing, thus improving the safe use performance of the battery. Attached Figure Description

[0009] To better understand this disclosure, reference may be made to the embodiments shown in the following figures. Components in the figures are not necessarily to scale, and related elements may be omitted to emphasize and clearly illustrate the technical features of this disclosure. Additionally, related elements or components may have different arrangements as known in the art. Furthermore, in the figures, the same reference numerals denote the same or similar components in various figures. Wherein:

[0010] Figure 1 This is a partial structural schematic diagram of a battery according to a first exemplary embodiment;

[0011] Figure 2 This is a partial structural schematic diagram of a battery according to a second exemplary embodiment;

[0012] Figure 3 This is a partial structural schematic diagram of a battery according to a third exemplary embodiment;

[0013] Figure 4 This is a schematic diagram of the structure of a battery according to an exemplary embodiment.

[0014] The annotations in the attached figures are explained as follows:

[0015] 10. First housing; 11. First metal part; 12. Second metal part; 20. Second housing; 30. Insulating structure; 31. Through hole; 40. Battery cell; 41. Positive electrode tab; 42. Negative electrode tab. Detailed Implementation

[0016] The technical solutions in the exemplary embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. The exemplary embodiments described herein are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of this disclosure.

[0017] In the description of this disclosure, unless otherwise expressly specified and limited, the terms “first” and “second” are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term “multiple” refers to two or more; and the term “and / or” includes any and all combinations of one or more associated listed items. In particular, references to “the / described” object or “a” object are also intended to indicate one of a possible plurality of such objects.

[0018] Unless otherwise specified or stated, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0019] Furthermore, it should be understood that the directional terms such as "upper," "lower," "inner," and "outer" described in the exemplary embodiments of this disclosure are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the exemplary embodiments of this disclosure. It should also be understood that, in the context of a reference to an element or feature being connected to another element(s) "upper," "lower," "inner," or "outer," it can be directly connected to the other element(s) "upper," "lower," "inner," or "outer," or indirectly connected to the other element(s) "upper," "lower," "inner," or "outer" through an intermediate element.

[0020] One embodiment of the present invention provides a battery, please refer to... Figures 1 to 4 The battery includes a first housing 10, which includes a first metal part 11 and a second metal part 12. The second metal part 12 is disposed inside the first metal part 11, such that the first metal part 11 forms the outer surface of the first housing 10 and the second metal part 12 forms the inner surface of the first housing 10. The materials of the first metal part 11 and the second metal part 12 are not the same. The corrosion potential of the second metal part 12 is higher than that of the first metal part 11 and higher than that of the negative electrode potential of the battery.

[0021] A battery according to one embodiment of the present invention includes a first casing 10. By configuring the first casing 10 as a first metal part 11 and a second metal part 12, with the second metal part 12 disposed inside the first metal part 11, the first metal part 11 forms the outer surface of the first casing 10, and the second metal part 12 forms the inner surface of the first casing 10. The corrosion potential of the second metal part 12 is higher than that of the first metal part 11 and higher than that of the negative electrode potential of the battery. That is, the corrosion potential of the second metal part 12 is relatively high, which can prevent the second metal part 12 from undergoing electrochemical corrosion, thereby improving the service life of the first casing 10 and ensuring the safety performance of the first casing 10, thereby improving the safe use performance of the battery.

[0022] It should be noted that the second metal component 12 is disposed within the first metal component 11, meaning the second metal component 12 can be nested within the first metal component 11. This allows the second metal component 12 to form the inner surface of the first casing 10. During battery use, the electrolyte is in contact with the second metal component 12, but rarely with the first metal component 11. Therefore, it can be assumed that the electrolyte will not cause electrochemical corrosion to the first metal component 11. However, the second metal component 12 is in contact with the electrolyte. If the corrosion potential of the second metal component 12 is low, electrochemical corrosion may occur. In related technologies, the casing is often made of aluminum. However, the junction of the aluminum casing and the negative electrode tab easily forms a lithium-aluminum alloy, leading to electrochemical corrosion of the casing. In this embodiment, by making the corrosion potential of the second metal component 12 higher than that of the first metal component 11, and also higher than the negative electrode potential of the battery, the problem of electrochemical corrosion of the second metal component 12 can be avoided. For example, when the second metal part 12 comes into contact with the negative electrode tab of the battery cell, the corrosion potential of the second metal part 12 is higher than that of the negative electrode of the battery. In this case, it is possible to prevent ions in the electrolyte from embedding into the crystal lattice of the second metal part 12.

[0023] The second metal part 12 is disposed within the first metal part 11. This can be achieved by forming the second metal part 12 and the first metal part 11 separately, and then placing the second metal part 12 within the first metal part 11. Alternatively, the second metal part 12 and the first metal part 11 can be integrally formed, for example, by using two flat plates to form the first housing 10 through stamping.

[0024] In one implementation, such as Figures 1 to 4 As shown, the battery also includes a second housing 20, which is connected to the first housing 10. The second housing 20 includes a third metal component, the material of which is different from that of the second metal component 12. The corrosion potential of the second metal component 12 is higher than that of the third metal component. In order to avoid electrochemical corrosion of the second metal component 12, the second housing 20 can be made of a material that is lower in cost and easier to form. In order to control the cost of the battery, the forming efficiency of the second housing 20 can be improved.

[0025] In one embodiment, the first housing 10 forms a receiving space, and the second housing 20 is a cover plate. The first housing 10 comes into contact with the electrolyte, while the second housing 20 has a lower probability of contact with the electrolyte. Therefore, by setting the first housing 10 as a first metal part 11 and a second metal part 12, with the second metal part 12 forming the inner surface of the first housing 10, and the corrosion potential of the second metal part 12 being higher than that of the first metal part 11 and higher than that of the negative electrode of the battery, electrochemical corrosion of the second metal part 12 can be prevented, thereby improving the service life of the first housing 10. The second housing 20 can be made of a low-cost and easily moldable material, which improves the molding efficiency of the second housing 20 while controlling battery costs.

[0026] In one embodiment, the material of the third metal part is the same as that of the first metal part 11, and the first metal part 11 is connected to the third metal part. That is, the third metal part and the first metal part 11, which are made of the same material, are more likely to form a stable connection, thereby improving the connection stability of the battery, ensuring the sealing performance of the battery, and thus improving the safe use performance of the battery.

[0027] In one embodiment, the first metal part 11 and the third metal part can be welded. Since the material of the third metal part is the same as that of the first metal part 11, a high quality weld strength can be guaranteed.

[0028] In one embodiment, the first metal part 11 comprises aluminum, the second metal part 12 comprises copper, and the third metal part comprises aluminum. While ensuring that the second metal part 12 has a high corrosion potential, the materials of the first metal part 11 and the second housing 20 can be made lighter and easier to form.

[0029] In some embodiments, the first metal part 11 comprises aluminum, the second metal part 12 comprises steel, and the third metal part comprises aluminum.

[0030] In one embodiment, the second metal part 12 and the third metal part are insulated from each other. This avoids direct electrical connection between the second metal part 12 and the third metal part and reduces the probability of electrolyte contact with the third metal part, thereby achieving the protection of the second housing 20.

[0031] In one implementation, such as Figure 2 and Figure 3 As shown, the battery also includes an insulating structure 30, which is disposed between the second metal part 12 and the third metal part to achieve insulation protection for the second metal part 12 and the third metal part, and to form a certain degree of seal between the second metal part 12 and the third metal part.

[0032] The insulating structure 30 can be insulating adhesive, or it can be an insulating block, such as a plastic block, a rubber block, etc.

[0033] In one embodiment, such as Figure 2 As shown, the insulating structure 30 has a through hole 31, which allows the opening of the second metal part 12 to be released, so that the battery cell inside the second metal part 12 can be connected to the second housing 20 through the through hole 31, or the battery cell inside the second metal part 12 can be connected to the electrode assembly on the second housing 20 through the through hole 31.

[0034] It should be noted that the battery cell can be directly electrically connected to the second housing 20. In this case, the battery cell's tabs can pass through the through-hole 31 and connect to the second housing 20. Alternatively, the second housing 20 can be provided with a terminal assembly, and the battery cell's tabs can pass through the through-hole 31 and connect to the terminal assembly. After the connection between the battery cell's tabs and the second housing 20 or the terminal assembly is completed, other preventive structures can be used to seal the through-hole 31 to prevent the electrolyte from contacting the second housing 20. Alternatively, the through-hole 31 can be used only for the tabs or conductive structures connected to the tabs to pass through, thereby also preventing the electrolyte from contacting the second housing 20.

[0035] In one embodiment, such as Figure 3 As shown, the insulating structure 30 seals the opening of the second metal part 12, which can completely prevent the electrolyte from contacting the second housing 20, thereby preventing the second housing 20 from undergoing electrochemical corrosion.

[0036] In one embodiment, such as Figure 4 As shown, the second housing 20 is insulated from the first housing 10. The battery also includes a cell 40, which includes a positive electrode tab 41 and a negative electrode tab 42. The positive electrode tab 41 and the negative electrode tab 42 are respectively connected to the third metal component and the second metal component 12, thereby effectively preventing ions in the electrolyte from embedding into the crystal lattice of the second metal component 12, thus preventing electrochemical corrosion between the second housing 20 and the first housing 10.

[0037] The second housing 20 can be made of aluminum, the first metal part 11 of the first housing 10 is made of aluminum, and the second metal part 12 of the first housing 10 is made of copper. The positive electrode tab 41 of the battery cell 40 is electrically connected to aluminum, and the negative electrode tab 42 of the battery cell 40 is electrically connected to copper. This can effectively prevent lithium ions from being embedded in the lattice of aluminum and avoid the formation of lithium-aluminum alloy. This ensures that the first housing 10 and the second housing 20 have sufficient structural strength, thereby ensuring the safe use performance of the battery.

[0038] In one embodiment, the battery cell 40 may include a battery cell body, a positive electrode tab 41, and a negative electrode tab 42. The positive electrode tab 41 and the negative electrode tab 42 may be located on opposite sides of the battery cell body. The positive electrode tab 41 may extend from one side of the battery cell body along a first direction, and the negative electrode tab 42 may extend from the other side of the battery cell body along a second direction. The first direction and the second direction are opposite, thereby facilitating the connection between the positive electrode tab 41 and the negative electrode tab 42 and the third metal member and the second metal member 12, respectively. Alternatively, the positive electrode tab 41 and the negative electrode tab 42 may extend from the same side of the battery cell body.

[0039] The main body of the battery cell includes two or more electrode plates, and the tab section includes two or more individual tabs. Each individual tab extends from its corresponding electrode plate, and the width of the individual tab can be smaller than the width of the electrode plate. Multiple individual tabs are stacked to form the tab section, which is connected to the electrode lead-out structure. The individual tabs are made of metal foil with good electrical and thermal conductivity, such as aluminum, copper, or nickel.

[0040] It should be noted that the positive electrode tab 41 and the negative electrode tab 42 can be connected to the third metal component and the second metal component 12, respectively. Alternatively, the battery may also include a positive electrode post assembly and a negative electrode post assembly, with the positive electrode tab 41 and the negative electrode tab 42 connected to the positive electrode post assembly and the negative electrode post assembly, respectively. Alternatively, the battery may also include a positive electrode post assembly, with the positive electrode tab 41 and the negative electrode tab 42 connected to the positive electrode post assembly and the second metal component 12, respectively. Alternatively, the battery may also include a negative electrode post assembly, with the positive electrode tab 41 and the negative electrode tab 42 connected to the third metal component and the negative electrode post assembly, respectively.

[0041] In one embodiment, the battery is a stacked battery, which is not only convenient to assemble, but also allows for the processing of batteries with longer lengths.

[0042] A battery comprises a cell 40 and an electrolyte, and is the smallest unit capable of electrochemical reactions such as charging / discharging. A cell is a unit formed by winding or laminating stacked portions, including a first electrode, a separator, and a second electrode. When the first electrode is a positive electrode, the second electrode is a negative electrode. The polarities of the first and second electrodes can be interchanged.

[0043] Specifically, the cell 40 is a stacked cell, which has a first electrode, a second electrode with the opposite electrical charge to the first electrode, and a separator between the first electrode and the second electrode, so that multiple pairs of first electrodes and second electrodes are stacked to form a stacked cell.

[0044] Optionally, the battery can be a wound battery, which involves winding a first electrode, a second electrode with the opposite electrical charge to the first electrode, and a separator disposed between the first and second electrodes to obtain a wound battery cell.

[0045] An embodiment of the present invention also provides a battery pack comprising the aforementioned battery.

[0046] The battery pack of one embodiment of the present invention includes a first housing 10. By setting the first housing 10 as a first metal part 11 and a second metal part 12, and the second metal part 12 being disposed inside the first metal part 11, the first metal part 11 can form the outer surface of the first housing 10, and the second metal part 12 can form the inner surface of the first housing 10. The corrosion potential of the second metal part 12 is higher than that of the first metal part 11 and higher than that of the negative electrode potential of the battery. That is, the corrosion potential of the second metal part 12 is relatively high, which can prevent the second metal part 12 from undergoing electrochemical corrosion, thereby improving the service life of the first housing 10 and ensuring the safety performance of the first housing 10, thereby improving the safe use performance of the battery pack.

[0047] In one embodiment, the battery pack is a battery module or a battery pack.

[0048] The battery module includes multiple batteries, and may also include end plates and side plates for fixing the multiple batteries.

[0049] It should be noted that multiple batteries can be assembled into a battery module and then installed inside the battery box. These batteries can be secured using end plates and side plates. Alternatively, multiple batteries can be directly installed inside the battery box without needing to be grouped together; in this case, the end plates and side plates can be removed.

[0050] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and exemplary embodiments are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

[0051] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of protection of this disclosure is limited only by the appended claims.

Claims

1. A battery, characterized in that, Includes a first housing (10), the first housing (10) comprising: First metal part (11); The second metal part (12) is disposed inside the first metal part (11) such that the first metal part (11) forms the outer surface of the first housing (10) and the second metal part (12) forms the inner surface of the first housing (10). The material of the first metal part (11) and the material of the second metal part (12) are not the same. The corrosion potential of the second metal part (12) is higher than that of the first metal part (11), and the corrosion potential of the second metal part (12) is higher than that of the negative electrode potential of the battery. The battery further includes a second housing (20), which is connected to the first housing (10). The second housing (20) includes a third metal component. The material of the third metal component is different from that of the second metal component (12). The corrosion potential of the second metal component (12) is higher than that of the third metal component. The material of the third metal component is the same as that of the first metal component (11). The first metal component (11) is connected to the third metal component. The first metal component (11) includes aluminum, and the second metal component (12) includes copper. The second housing (20) is insulated from the first housing (10). The battery also includes a cell (40), which includes a positive electrode tab (41) and a negative electrode tab (42). The positive electrode tab (41) and the negative electrode tab (42) are respectively connected to the third metal part and the second metal part (12).

2. The battery according to claim 1, characterized in that, The second metal part (12) is insulated from the third metal part.

3. The battery according to claim 2, characterized in that, The battery also includes: An insulating structure (30) is disposed between the second metal part (12) and the third metal part.

4. The battery according to claim 3, characterized in that, The insulating structure (30) has a through hole (31), or the insulating structure (30) seals the opening of the second metal part (12).

5. The battery according to claim 1, characterized in that, The first metal part (11) is welded to the third metal part.

6. The battery according to any one of claims 1 to 5, characterized in that, The second housing (20) is a cover plate.

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