Lithium metal battery box

Abstract

The utility model relates to a lithium metal battery box. The lithium metal battery box comprises a supporting assembly and a plurality of battery assemblies, the supporting assembly comprises a first limiting plate, a first separator, a second separator and a second limiting plate, the first separator is arranged on the first limiting plate, and the second separator is arranged on the second limiting plate; a first separator is arranged between every two adjacent battery assemblies, each battery assembly comprises a plurality of single battery cells, and a second separator is arranged between every two adjacent single battery cells. According to the scheme provided by the invention, the change of the thickness of the lithium metal single battery in the discharging process can be limited, and the packaging difficulty of an aluminum plastic film is reduced.

Description

Technical Field

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

[0002] A secondary battery, also known as a rechargeable battery or accumulator, is a type of battery that can be recharged after being discharged and reused. Current lithium metal batteries are a type of secondary battery; they are relatively small and typically used in the aerospace industry.

[0003] In related technologies, the thickness of lithium metal single-cell batteries changes significantly during discharge, which is detrimental to charge-discharge cycles. Furthermore, in the subsequent aluminum-plastic film encapsulation process, the low mechanical strength of the aluminum-plastic film and the need to allow space for the expansion of the single-cell battery during encapsulation, along with the change in the thickness of the single-cell battery to prevent tearing of the aluminum-plastic film, increase the difficulty of assembly. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a lithium metal battery box that can limit the thickness change of lithium metal single cells during discharge and reduce the difficulty of aluminum-plastic film packaging.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] The first aspect of this application provides a lithium metal battery box, comprising: a support assembly including a first limiting plate, a first isolation member, a second isolation member and a second limiting plate, wherein the first isolation member is disposed on the first limiting plate and the second isolation member is disposed on the second limiting plate; and a plurality of battery components, wherein a first isolation member is disposed between each two adjacent battery components, and each battery component includes a plurality of individual cells, wherein a second isolation member is disposed between each two adjacent individual cells.

[0007] The first isolation element includes a first top holding block, which is disposed between two adjacent individual cells.

[0008] The second isolation component includes a second support block, a buffer block, a third support block, and a fourth support block. The second support block is disposed between the two battery components, the buffer block is disposed on the second support block, and the third and fourth support blocks are respectively disposed on the buffer block.

[0009] The individual battery cell has a clearance slot.

[0010] The support assembly also includes a busbar, which is disposed on the individual battery cell.

[0011] The first limiting plate has a groove, and the first top holding block is disposed in the groove.

[0012] It also includes a housing assembly, which includes a base, a second limiting plate disposed on the base, a through hole on the second limiting plate, and a second top holding block passing through the through hole and connected to the base.

[0013] The support assembly also includes a heat sink, which is disposed on the individual battery cell.

[0014] The outer shell assembly also includes a middle frame and a cover. The middle frame is disposed on the base and has multiple storage areas. Each storage area, when connected, has a "U"-shaped cross-sectional structure. The cover is disposed on the middle frame.

[0015] The housing assembly also includes foot pads disposed on the base.

[0016] Compared with the prior art, the present invention has at least the following advantages:

[0017] The first and second limiting plates limit the vertical movement of the battery assembly, while the first and second separators limit the horizontal movement of the individual battery cell. This restricts the thickness variation of the individual battery cell during discharge, reducing the complexity of aluminum-plastic film encapsulation. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly described below.

[0019] Figure 1 This is a schematic diagram of the battery assembly and support assembly in one embodiment of the present invention;

[0020] Figure 2 This is an exploded view of a lithium metal battery box according to one embodiment of the present invention.

[0021] Figure 3 This is a schematic diagram of the structure of the middle frame in one embodiment of the present utility model;

[0022] Figure 4 This is a schematic diagram of the structure of a lithium metal battery box in one embodiment of the present invention. Detailed Implementation

[0023] Embodiments of this application will now be described in more detail with reference to the accompanying drawings. While embodiments of this application are shown in the drawings, it should be understood that this application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make this application more thorough and complete, and to fully convey the scope of this application to those skilled in the art.

[0024] It should be understood that although the terms "first," "second," "third," etc., may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0025] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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 application according to the specific circumstances.

[0026] A secondary battery, also known as a rechargeable battery or accumulator, is a type of battery that can be recharged after being discharged. Current lithium metal batteries are a type of secondary battery, small in size, and typically used in the aerospace field. In related technologies, the thickness of a single lithium metal cell changes significantly during discharge, which is detrimental to charge-discharge cycling. Furthermore, in the subsequent aluminum-plastic film encapsulation process, the low mechanical strength of the aluminum-plastic film and the need to allow space for the expansion of individual cells during encapsulation, combined with the increased thickness of the individual cells to prevent tearing of the aluminum-plastic film, further complicates assembly.

[0027] To address the aforementioned issues, this application provides a lithium metal battery case that can limit the thickness variation of individual lithium metal cells during discharge, thereby reducing the difficulty of aluminum-plastic film encapsulation.

[0028] The technical solutions of the embodiments of this application are described in detail below with reference to the accompanying drawings.

[0029] Please see Figure 1 and Figure 2A lithium metal battery box includes: a support assembly 100 and a plurality of battery components 200. The support assembly 100 includes a first limiting plate 110, a first isolation member 120, a second isolation member 130 and a second limiting plate 140. The first isolation member 120 is disposed on the first limiting plate 110 and the second isolation member 130 is disposed on the second limiting plate 140. A first isolation member 120 is disposed between every two adjacent battery components 200. The battery component 200 includes a plurality of individual cells 210 and a second isolation member 130 is disposed between every two adjacent individual cells 210.

[0030] It should be noted that the battery assembly 200 is a large battery module. The first limiting plate 110 is located at the top of the multiple battery assemblies 200, and the second limiting plate 140 is located at the bottom of the multiple battery assemblies 200. The arrangement of the first limiting plate 110 and the second limiting plate 140 can limit the thickness of the upper and lower sides of the battery assembly 200. Furthermore, a first separator 120 is provided between every two adjacent battery assemblies 200, and a second separator 130 is provided between every two adjacent individual cells 210. The arrangement of the first separator 120 and the second separator 130 can limit the thickness of the individual cell 210 on the left and right sides. Through the above arrangement, the change in thickness of the individual cell 210 during discharge can be limited, reducing the difficulty of aluminum-plastic film encapsulation.

[0031] Please see Figure 1 In one embodiment, the first isolation member 120 includes a first top holding block 121, which is disposed between two adjacent individual cells 210.

[0032] It should be noted that both sides of the individual battery cell 210 are provided with clearance grooves 211, and the first top holding block 121 is disposed in the clearance groove 211. Furthermore, the individual battery cell 210 is provided with first top holding blocks 121 on both the upper and lower sides. Further, a battery assembly 200 includes four individual battery cells 210. The first top holding blocks 121 of the two middle individual battery cells 210 are slightly longer and thicker, and are used to cooperate with the grooves 111 provided on the first limiting plate 110.

[0033] Please see Figure 1 In one embodiment, the second isolation member 130 includes a second support block 131, a buffer block 132, a third support block 133, and a fourth support block 134. The second support block 131 is disposed between the two battery assemblies 200, the buffer block 132 is disposed on the second support block 131, and the third support block 133 and the fourth support block 134 are respectively disposed on the buffer block 132.

[0034] It should be noted that during charging, the individual battery cell 210 absorbs the thickness expansion caused by electrochemical mechanical stress through the buffer block 132. The buffer block 132 is made of a low-density, high-resilience foam material and fills the entire surface of the individual battery cell 210 to prevent excessive deformation of the individual battery cell 210 from causing an internal short circuit. Furthermore, the second support block 131, the third support block 133, and the fourth support block 134 are located at both ends of the buffer block 132 and are also located between the two battery modules 200, which limit the movement between the battery modules 200 and prevent large thickness changes in the individual battery cell 210.

[0035] Furthermore, the thin lithium metal negative electrode of the lithium metal battery cannot be bent. Therefore, in the dual-head tab structure design, the aluminum-plastic film seal of the negative electrode tab area is longer than that of the positive electrode tab area. In order to satisfy the force medium for applying binding force in the vertical direction of the single cell 210, the first top holding block 121 is used to fill the step where the negative electrode sheet and the aluminum-plastic film seal meet, so as to ensure that the step where the positive and negative electrode sheets and the aluminum-plastic film seal meet can be flush after the single cell 210 is stacked.

[0036] Please see Figure 1 In one embodiment, the support assembly 100 further includes a busbar 150 disposed on the individual battery cell 210.

[0037] It should be noted that the busbar 150 is provided on both the upper and lower sides of the single cell 210. It can act as a force-applying medium when the single cell 210 slides up and down, and fits tightly with the first top holding block 121.

[0038] In summary, the first limiting plate 110 and the second limiting plate 140 adopt a tenon and mortise structure to cooperate with the busbar 150 and other top holding blocks, so that the upper and lower surfaces of the entire battery assembly 200 become a plane. This is beneficial for the battery assembly 200 to be effectively limited on the six sides (upper, lower, left, right, front, and rear) after it is installed in the battery box, thus reducing the pressure on the aluminum-plastic film encapsulation.

[0039] Please see Figure 1 In one embodiment, the support assembly 100 further includes a heat sink 160 disposed on the individual battery cell 210.

[0040] It is understood that the heat sink 160 is made of graphene and is placed on one side of the individual battery cell 210 through an interference fit, thereby effectively reducing the heat generated by the individual battery cell 210. This allows the battery assembly 200 to generate heat evenly in the battery box, meeting the high-rate discharge conditions of the individual battery cell 210, while also better maintaining the consistency of the charging and discharging process of the individual battery cell 210 and improving cycle stability.

[0041] Please see Figure 3 and Figure 4 In one embodiment, the lithium metal battery box further includes a housing assembly 300, which includes a base 310, a second limiting plate 140 disposed on the base 310, and a through hole 141 formed on the second limiting plate 140. A second top holding block 131 passes through the through hole 141 and is connected to the base 310. Specifically, the housing assembly 300 also includes foot pads 320 disposed on the base 310.

[0042] It should be noted that the base 310 is made of alloy material, and the bottom of the base 310 is equipped with foot pads 320. The foot pads 320 can prevent the bottom of the base 310 from being worn after direct contact with the ground, and can also absorb some of the impact of gravity when the entire battery box is placed on the ground.

[0043] Please see Figure 2 and Figure 3 In one embodiment, the outer casing assembly 300 further includes a middle frame 330 and a cover 340. The middle frame 330 is disposed on the base 310 and has multiple storage areas 331 inside. Each storage area 331 has a "U" shaped cross-sectional structure when connected. The cover 340 is disposed on the middle frame 330.

[0044] It should be noted that the storage area 331 is used to place the battery assembly 200. By connecting multiple storage areas 331 and setting them into a "U" shape, the opening area can facilitate air circulation and heat dissipation, while also accommodating electrical components and connectors, making the entire battery box have a regular appearance.

[0045] The solution of this application has been described in detail above with reference to the accompanying drawings. In the above embodiments, the descriptions of each embodiment have different focuses; for parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments. Those skilled in the art should also understand that the actions and modules involved in the specification are not necessarily essential to this application. Furthermore, it is understood that the steps in the method of this application embodiment can be adjusted, combined, and deleted according to actual needs, and the modules in the device of this application embodiment can be combined, divided, and deleted according to actual needs.

[0046] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A lithium metal battery case, characterized in that, include: The support component includes a first limiting plate, a first isolating member, a second isolating member, and a second limiting plate, wherein the first isolating member is disposed on the first limiting plate, and the second isolating member is disposed on the second limiting plate; and A plurality of battery modules are provided, with a first separator between each two adjacent battery modules, and the battery module includes a plurality of individual cells, with a second separator between each two adjacent individual cells.

2. The lithium metal battery case according to claim 1, characterized in that, The first isolation element includes a first top holding block, which is disposed between two adjacent individual cells.

3. The lithium metal battery case according to claim 1, characterized in that, The second isolation component includes a second support block, a buffer block, a third support block, and a fourth support block. The second support block is disposed between the two battery components, the buffer block is disposed on the second support block, and the third and fourth support blocks are respectively disposed on the buffer block.

4. The lithium metal battery box according to claim 1 or 2, characterized in that, The individual battery cell has a clearance slot.

5. The lithium metal battery case according to claim 1, characterized in that, The support assembly also includes a busbar, which is disposed on the individual battery cell.

6. The lithium metal battery case according to claim 2, characterized in that, The first limiting plate has a groove, and the first top holding block is disposed in the groove.

7. The lithium metal battery case according to claim 3, characterized in that, It also includes a housing assembly, which includes a base, a second limiting plate disposed on the base, a through hole on the second limiting plate, and a second top holding block passing through the through hole and connected to the base.

8. The lithium metal battery case according to claim 1, characterized in that, The support assembly also includes a heat sink, which is disposed on the individual battery cell.

9. The lithium metal battery case according to claim 7, characterized in that, The outer shell assembly also includes a middle frame and a cover. The middle frame is disposed on the base and has multiple storage areas. Each storage area, when connected, has a "U"-shaped cross-sectional structure. The cover is disposed on the middle frame.

10. The lithium metal battery case according to claim 9, characterized in that, The housing assembly also includes foot pads disposed on the base.

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