Battery pack lower shell and battery pack

Abstract

The utility model provides a battery pack lower shell and a battery pack, the battery pack lower shell comprises a shell main body and a limiting assembly arranged in the shell main body, and the limiting assembly is used for limiting a battery cell module; the limiting assembly comprises four first limiting pieces, the first limiting pieces and the four corners of the shell body are arranged in a one-to-one correspondence mode, and the battery cell module is installed in an installation area defined by the first limiting pieces in a limited mode. According to the lower shell of the battery pack, disclosed by the utility model, the cell module can be limited, the cell module is prevented from moving or deviating in the shell main body, and the risk that electrical parts such as an FPC (Flexible Printed Circuit), a busbar and the like are staggered or torn is reduced, so that the safety quality of the battery pack is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a lower shell of a battery pack. Meanwhile, the utility model also relates to a battery pack provided with the lower shell of the battery pack. Background Art

[0002] Lithium iron phosphate cells are safer than ternary cells, which has led more and more battery manufacturers to increase their production share. In addition, as users have higher and higher requirements for driving range, CTC (Cell to Chassis, where cells are directly integrated into the vehicle chassis) and CTP (Cell to Pack, where cells are assembled into battery packs) have emerged in recent years to maximize the use of space in the battery pack. This has not only improved the volume utilization of the entire pack, but also saved the number and cost of internal components. It is now the more mainstream lithium iron phosphate cell grouping solution.

[0003] At present, the main presentation form of lithium iron phosphate cells is "blade" or "short knife", which can be formed by directly stacking multiple cells at the whole pack level to achieve "non-module" and reduce the number of components such as end plates and cover plates. However, some large-capacity whole pack solutions contain a large number of cells, up to several hundred. At the same time, in order to further increase the volume utilization rate, some battery packs even cancel the design of the horizontal and vertical beams in the pack, which makes the positioning of the cell group an urgent problem to be solved. Otherwise, it is easy to cause the risk of misalignment or tearing of electrical components such as FPC and busbars due to cell offset, affecting the safety quality of the battery pack and electric vehicles. Utility Model Content

[0004] In view of this, the present invention aims to provide a battery pack lower shell to improve the safety of the battery pack.

[0005] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0006] A battery pack lower shell comprises a shell body and a limiting component arranged in the shell body, wherein the limiting component is used to limit a battery cell module;

[0007] The limiting assembly includes a plurality of first limiting members, each of which is arranged in one-to-one correspondence with each corner of the shell body, and the battery cell module is limitedly installed in an installation area surrounded by each of the first limiting members.

[0008] Further, each of the first limiting members is disposed on the bottom wall of the shell body; and / or each of the first limiting members is L-shaped.

[0009] Furthermore, the limiting assembly includes a second limiting member and a third limiting member located in the installation area, and the second limiting member and the third limiting member divide the installation area into multiple sub-areas; the battery cell module includes multiple battery cell groups, and each of the battery cell groups is limited and arranged in each of the sub-areas one by one.

[0010] Furthermore, at least one of the second limiting members is disposed on a center line connecting two adjacent first limiting members, and at least one of the third limiting members is disposed on a center line connecting two opposite second limiting members.

[0011] Furthermore, the second limiting member is T-shaped, and the third limiting member is cross-shaped.

[0012] Furthermore, the ratio of the height dimensions of the first limiter, the second limiter and the third limiter to the height dimensions of the single battery cell in the battery cell module is between 0.1-0.5; and / or the ratio of the thickness dimensions of the first limiter, the second limiter and the third limiter to the height dimensions of the first limiter, the second limiter and the third limiter is between 0.1-0.5.

[0013] Furthermore, the limiting assembly and the bottom wall are screwed together, or the limiting assembly and the bottom wall are clamped together, or the limiting assembly and the bottom wall are bonded together.

[0014] Furthermore, the limiting component is made of flame-retardant plastic material.

[0015] Furthermore, the limiting assembly is integrally formed with the shell body.

[0016] Compared with the prior art, the utility model has the following advantages:

[0017] The lower shell of the battery pack described in the utility model forms an installation area by setting a plurality of first limiting members to limit the battery cell module, which can avoid the battery cell module from moving or offsetting in the shell body, reduce the risk of misalignment or tearing of electrical components such as FPC and bus, and thus improve the safety of long-term use of the battery pack. At the same time, the use of the same plurality of first limiting members is conducive to reducing the material customization cost, and the first limiting members are respectively arranged corresponding to the corners of the shell body, which can also reduce the occupation of the entire package space and help improve the volume utilization rate of the entire package.

[0018] Secondly, each first limiter is arranged on the bottom wall of the shell body, which is conducive to reducing the difficulty of assembling each first limiter and the shell body. At the same time, each first limiter is L-shaped, which is conducive to the standardization of parts and cost reduction. By dividing multiple sub-areas by the second limiter and the third limiter, and then separately limiting multiple battery cell groups, it can be avoided that the battery cell module is too large to be effectively limited by the first limiter, thereby improving the limiting effect of the battery cell module as a whole. The second limiter is T-shaped and the third limiter is cross-shaped, which is conducive to the standardized design of the two and reduces the production cost.

[0019] In addition, the ratio of the height dimension of the first limiter, the second limiter and the third limiter to the height dimension of the single cell in the cell module is between 0.1-0.5, which will not interfere with the pole of the single cell, but also have a better limiting and blocking effect on the cell module, and the ratio of the thickness dimension of the first limiter, the second limiter and the third limiter to the height dimension of the first limiter, the second limiter and the third limiter is between 0.1-0.5, so as to reduce the space occupied by the whole package while ensuring good structural strength. The screw connection between the limiter assembly and the bottom wall, or the clamping connection between the limiter assembly and the bottom wall can realize the convenient disassembly and assembly of the limiter assembly, and meet the limiting requirements of cell modules of different sizes.

[0020] Another object of the present invention is to provide a battery pack, which includes the battery pack lower shell as described above.

[0021] The battery pack described in the present invention and the battery pack lower shell described above have the same beneficial effects as compared to the conventional technology, and will not be described in detail herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0023] Figure 1 This is a schematic diagram of the overall structure of the lower housing of the battery pack according to an embodiment of the utility model;

[0024] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0025] Figure 3 An exploded view of the lower housing of the battery pack according to an embodiment of the present utility model;

[0026] Figure 4 This is a schematic diagram of the structure of the shell body according to an embodiment of the utility model;

[0027] Figure 5This is a schematic structural diagram of the first position-limiting member according to an embodiment of the utility model;

[0028] Figure 6 This is a schematic structural diagram of the second position-limiting member according to an embodiment of the utility model;

[0029] Figure 7 This is a schematic structural diagram of the third position-limiting member according to an embodiment of the utility model;

[0030] Description of reference numerals:

[0031] 1. Shell body; 11. Bottom wall; 12. Side wall; 13. Sub-area;

[0032] 2. Limiting assembly; 21. First limiting member; 22. Second limiting member; 23. Third limiting member;

[0033] 3. Battery cell group; 30. Single battery cell. DETAILED DESCRIPTION

[0034] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0035] In the description of the present invention, it should be noted that if there are terms such as "upper", "lower", "inner", "outer" and the like indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, if there are terms such as "first" and "second", they are also used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0036] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection" and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0037] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0038] Embodiment 1

[0039] The present embodiment relates to a lower shell of a battery pack, which can effectively limit the internal battery cell module to prevent the battery cell module from shifting and causing misalignment or tearing of electrical components such as FPC and bus in the battery pack, thereby making the entire pack more reliable in use.

[0040] In terms of overall structure, Figures 1 to 7 As shown, the lower shell of the battery pack of this embodiment includes a shell body 1 and a limiting assembly 2 arranged in the shell body 1, and the limiting assembly 2 is used to limit the battery module. The limiting assembly 2 includes a plurality of first limiting members 21, each of which is arranged one by one corresponding to each corner of the shell body 1, and the battery module is limitedly installed in the installation area surrounded by each first limiting member 21.

[0041] It is worth mentioning that, in a specific implementation, the lower shell of the battery pack of this embodiment includes a bottom wall, and a side wall 12 arranged on the bottom wall 11, and the installation area is located in the cavity enclosed by the side wall 12 and the bottom wall, and the bottom wall is generally rectangular, that is, the lower shell of the battery pack has four corners, and the first limit members 21 are four corresponding to the four corners.

[0042] At the same time, when the above-mentioned first limiting member 21 is specifically set, under the premise of ensuring structural strength, its own thickness dimension should be as small as possible, and its height dimension should also be as small as possible while ensuring effective limiting effect on the battery cell module, and it should be set close to or fit the corresponding corner. The advantage of such a setting is that it can not only achieve the purpose of limiting the battery cell module, but also ensure that the whole package has a high volume utilization rate.

[0043] Based on the above overall introduction, specifically, in this embodiment, as a preferred implementation form, see Figure 2 and Figure 4 As shown, each first position-limiting member 21 is disposed on the bottom wall 11 of the shell body 1 , so as to reduce the difficulty of assembling each first position-limiting member 21 and the shell body 1 .

[0044] Of course, in this embodiment, when necessary, each first position-limiting member 21 may also be directly disposed in contact with the corresponding corner portion, that is, each first position-limiting member 21 is disposed on the side wall 12 forming the corresponding corner portion.

[0045] At the same time, as a preferred implementation form, in this embodiment, Figure 5 As shown, each first stopper 21 is L-shaped, which is conducive to achieving parts standardization and cost reduction. Furthermore, in specific implementation, the right-angled corners formed by each first stopper 21 itself are arranged corresponding to the corners of the battery module, thereby forming a limit function.

[0046] See also Figures 2 to 4As shown, in this embodiment, as a preferred implementation form, the limiting component 2 includes a second limiting member 22 and a third limiting member 23 located in the installation area, and the second limiting member 22 and the third limiting member 23 divide the installation area into a plurality of sub-areas 13.

[0047] Furthermore, the cell module includes a plurality of cell groups 3, each of which is composed of a plurality of common single cells 30, and each of the cell groups 3 is correspondingly limited in each sub-region 13. It can be understood that by dividing the plurality of sub-regions 13 by the second limiting member 22 and the third limiting member 23, and then separately limiting the plurality of cell groups 3, it is possible to avoid the cell module being too large to be effectively limited by the first limiting member 21, thereby improving the limiting effect of the entire cell module.

[0048] Specifically, in this embodiment, as a preferred implementation form, still refer to Figure 4 As shown, at least one second position-limiting member 22 is disposed on a center line connecting two adjacent first position-limiting members 21 , and at least one third position-limiting member 23 is disposed on a center line connecting two opposite second position-limiting members 22 .

[0049] The advantage of such an arrangement is that a rectangular sub-area 13 can be formed, thereby ensuring the rationality of the division of the sub-area 13 and facilitating the improvement of the space utilization rate in the lower shell of the battery pack.

[0050] In the specific structure, the number of the second limiting member 22 and the third limiting member 23 can be set according to the number of the battery cell group 3. For example, the battery cell module includes Figure 1 As shown in the two columns of battery cell groups 3 in the width direction, each column of battery cell groups 3 is arranged in sequence along the length direction. A second limiting member 22 is arranged between two opposite first limiting members 21 in the width direction, two second limiting members 22 arranged at intervals are arranged between two opposite first limiting members 21 in the length direction, and two third limiting members 23 arranged at intervals are arranged between two opposite second limiting members 22 in the length direction, thereby completing the division of the sub-areas 13 corresponding to the six battery cell groups 3.

[0051] Considering the requirement for limiting the position of the battery pack 3, in this embodiment, as a preferred implementation form, see Figure 6 and Figure 7 As shown, the second limiting member 22 is T-shaped and the third limiting member 23 is cross-shaped, so as to facilitate the standardized design of the two and reduce the manufacturing cost.

[0052] At the same time, the second limiting member 22 can form two right-angled corners, and the third limiting member 23 can form four right-angled corners, thereby facilitating the cooperation between the two and the first limiting member 21 to form multiple sub-areas 13.

[0053] Moreover, in the present embodiment, as a preferred implementation form, the ratio of the height dimensions of the first limit member 21, the second limit member 22 and the third limit member 23 to the height dimension of the single cell 30 in the battery module is between 0.1-0.5, and the specific values ​​can be 0.1, 0.3 or 0.5, etc. The advantage of such a setting is that it will not interfere with the pole of the single cell 30, and can also have a better limiting and blocking effect on the battery module.

[0054] Moreover, also as a preferred implementation form, in this embodiment, the ratio of the thickness dimensions of the first limit member 21, the second limit member 22 and the third limit member 23 to the height dimensions of the first limit member 21, the second limit member 22 and the third limit member 23 is between 0.1-0.5, and the specific values ​​can be 0.1, 0.3 or 0.5, etc., so as to ensure that it has good structural strength while reducing the space occupied by the whole package, thereby ensuring that the whole package has good energy density.

[0055] It can be understood that the arrangement of the first limit member 21, the second limit member 22 and the third limit member 23 in this embodiment, in addition to forming a limit function for the battery cell module, can also be used as reinforcement members to replace the cross beams and longitudinal beams in the traditional battery pack to increase the structural strength of the shell body.

[0056] In addition, in this embodiment, as a preferred implementation form, the limiting component 2 is screwed to the bottom wall to achieve convenient disassembly and assembly of the limiting component 2, thereby meeting the limiting requirements of battery cell modules of different sizes.

[0057] Of course, in addition to being screwed to the bottom wall, the limit assembly 2 of this embodiment can also be configured to be snap-connected to the bottom wall or bonded to the bottom wall according to actual installation requirements. When snap-connected, it also has the function of convenient disassembly and assembly, and when bonded, it has the advantages of reliable connection and low cost.

[0058] In addition, in this embodiment, as a preferred implementation form, the limit assembly 2 is made of flame-retardant plastic material, thereby ensuring the safety of the battery pack. In specific implementation, the flame-retardant plastic material can be PPE (Polyphenylene Oxide, polyphenylene ether) material, PA6 (Polyamide 6, polyamide 6 or nylon 6) material or ABS (Acrylonitrile Butadiene Styrene, acrylonitrile-butadiene-styrene copolymer) material, etc.

[0059] Furthermore, in this embodiment, as a preferred implementation form, the limiting assembly 2 is integrally formed with the shell body 1. The advantage of such a configuration is that it can reduce the assembly process, improve the production efficiency, and at the same time, it is also conducive to the standardized design of the entire lower shell of the battery pack.

[0060] In specific implementation, the above-mentioned limit assembly 2 and the shell body 1 can be made of materials for one-piece molding that are well known to technical personnel in this field, such as non-metallic materials such as polyurethane materials, epoxy resin mixed reinforced glass fiber materials and glass fiber cloth, or metal materials such as aluminum alloy or steel.

[0061] The lower shell of the battery pack of this embodiment forms an installation area by setting a plurality of first limiting members 21 to limit the battery cell module, thereby preventing the battery cell module from moving or shifting in the shell body 1, reducing the risk of misalignment or tearing of electrical components such as FPC and bus, thereby improving the safety of long-term use of the battery pack. At the same time, the use of the same plurality of first limiting members 21 is conducive to reducing the cost of material customization, and the first limiting members 21 are respectively arranged corresponding to the corners of the shell body 1, which can also reduce the occupation of the entire package space and help improve the volume utilization rate of the entire package.

[0062] Embodiment 2

[0063] This embodiment relates to a battery pack, which includes the battery pack lower shell in the first embodiment. The battery pack is preferably integrated on a power device. The power device here can be a vehicle such as an electric car or a hybrid electric car, etc. The battery pack is preferably integrated on the body or chassis of the vehicle to reduce the space occupancy of the battery pack, meet the cost reduction requirements, and improve the energy density of the battery pack.

[0064] The battery pack of this embodiment, by providing the battery pack lower shell in the first embodiment, can avoid potential safety hazards caused by the deviation of the battery cell module while ensuring good volume utilization, thereby improving safety performance.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery pack lower shell, characterized in that: It includes a shell body and a limiting component arranged in the shell body, and the limiting component is used to limit the battery cell module; The limiting assembly includes a plurality of first limiting members, each of which is arranged in one-to-one correspondence with each corner of the shell body, and the battery cell module is limitedly installed in an installation area surrounded by each of the first limiting members.

2. The battery pack lower shell according to claim 1, characterized in that: Each of the first limiting members is arranged on the bottom wall of the shell body; and / or each of the first limiting members is L-shaped.

3. The battery pack lower shell according to claim 1 or 2, characterized in that: The limiting assembly comprises a second limiting member and a third limiting member located in the installation area, wherein the second limiting member and the third limiting member divide the installation area into a plurality of sub-areas; The cell module includes a plurality of cell groups, and each of the cell groups is positioned in a one-to-one correspondence within each of the sub-areas.

4. The battery pack lower shell according to claim 3, characterized in that: At least one second position-limiting member is disposed on a center line connecting two adjacent first position-limiting members, and at least one third position-limiting member is disposed on a center line connecting two opposite second position-limiting members.

5. The battery pack lower shell according to claim 4, characterized in that: The second limiting member is T-shaped, and the third limiting member is cross-shaped.

6. The battery pack lower shell according to claim 3, characterized in that: The ratio of the height dimensions of the first limiting member, the second limiting member and the third limiting member to the height dimension of the single cell in the cell module is between 0.1 and 0.5; and / or, The ratio of the thickness of the first limiting member, the second limiting member and the third limiting member to the height of the first limiting member, the second limiting member and the third limiting member is between 0.1-0.

5.

7. The battery pack lower shell according to claim 2, characterized in that: The limiting assembly is screwed to the bottom wall, or the limiting assembly is clamped to the bottom wall, or the limiting assembly is bonded to the bottom wall.

8. The battery pack lower shell according to claim 1, characterized in that: The limiting component is made of flame-retardant plastic material.

9. The battery pack lower housing according to claim 1, characterized in that: The limiting assembly is integrally formed with the shell body.

10. A battery pack, characterized in that: A battery pack lower shell comprising the battery pack lower shell according to any one of claims 1 to 9.

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