Battery pack box body and battery pack

Abstract

The utility model provides a battery pack box body and a battery pack, and the battery pack box body comprises a lower box body, a cover plate, a partition plate and a liquid cooling plate, a battery cell placing area for placing a battery cell assembly is arranged in the lower box body, the battery cell assembly comprises at least two rows of cylindrical battery cells which are arranged at intervals in the vertical direction, and the cylindrical battery cells are horizontally and inversely placed; the partition plates are horizontally mounted on the lower box body, are separated between two adjacent rows of cylindrical battery cells and are used for fixing the cylindrical battery cells; the liquid cooling plate is vertically mounted in the lower box body, and battery cell assemblies are respectively adhered to two sides of the liquid cooling plate; and the cover plate is detachably connected with the lower box body. The cylindrical battery cells are horizontally and inversely placed in the battery cell placement area, the cylindrical battery cells are cooled through the vertically placed liquid cooling plate, the two adjacent rows of cylindrical battery cells are separated by the partition plate, and the cylindrical battery cells are fixed, so that the longitudinal space of the battery pack box body can be fully utilized, and the energy density of the battery pack is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, and in particular to a battery pack box and a battery pack. Background Art

[0002] The emergence of cell-to-pack (CTP) technology in the development of lithium-ion batteries has brought significant innovation to the development of electric vehicles. CTP eliminates the module component of typical integrated battery assembly and directly integrates the cells within the battery pack. This innovative solution significantly reduces the number of structural components within the battery pack, thereby increasing the space available for cell placement and reducing pack weight.

[0003] At present, in module-free battery packs, battery cells are generally placed vertically in the battery pack case, and a liquid cooling plate is set at the bottom of the battery pack case to cool the battery cells. The above structure has low utilization rate of the longitudinal space of the battery pack case, resulting in low energy density of the battery pack. Utility Model Content

[0004] In view of this, the present invention proposes a battery pack case and a battery pack to solve the technical problem that in the module-free battery pack proposed in the above background technology, the battery cells are generally placed vertically in the battery pack case, the longitudinal space utilization of the battery pack case is low, and the energy density of the battery pack is low.

[0005] The technical solution of the present utility model is achieved as follows:

[0006] In a first aspect, the present invention provides a battery pack box, comprising a lower box, a cover plate, a partition plate, and a liquid cooling plate, wherein:

[0007] The lower box body is provided with a cell placement area for placing a cell assembly, wherein the cell assembly includes at least two rows of cylindrical cells arranged at intervals in a vertical direction, and the cylindrical cells are placed upside down horizontally;

[0008] The partition is horizontally mounted on the lower box body, the partition separates two adjacent rows of cylindrical battery cells, and is used to fix the cylindrical battery cells;

[0009] The liquid cooling plate is vertically installed in the lower box, and the battery core components are respectively attached to both sides of the liquid cooling plate;

[0010] The cover plate is detachably connected to the lower box body.

[0011] On the basis of the above technical solution, preferably, the top surface of the partition is provided with a plurality of bearing parts matching the cylindrical surface of the cylindrical battery cell, so that the bottom surface of the partition forms a plurality of clamping parts, and the clamping part is located between two adjacent bearing parts, and the clamping part is used to clamp the cylindrical battery cell located in the lower layer of the battery cell assembly.

[0012] On the basis of the above technical solution, preferably, a pressing plate is further included, and the pressing plate is connected to the uppermost layer of cylindrical cells in the cell assembly via potting glue.

[0013] On the basis of the above technical solution, preferably, the pressing plate is located above two adjacent battery cell assemblies to simultaneously press the uppermost layer of cylindrical battery cells in the two battery cell assemblies.

[0014] Based on the above technical solution, preferably, the lower box body includes a bottom plate and four side plates, the four side plates are respectively vertically connected to the four sides of the bottom plate, the battery cell placement area is located on the bottom plate, and the top surface of the bottom plate is provided with first reinforcing ribs that are staggered horizontally and vertically.

[0015] On the basis of the above technical solution, preferably, the side panels are provided with second reinforcing ribs that are staggered horizontally and vertically.

[0016] On the basis of the above technical solution, preferably, an electrical component arrangement area is further provided on the bottom plate.

[0017] On the basis of the above technical solution, preferably, the bottom surface of the bottom plate is provided with staggered third reinforcing ribs.

[0018] On the basis of the above technical solution, preferably, a hoisting portion is provided on the side panel.

[0019] In a second aspect, the present invention further proposes a battery pack, comprising a battery cell assembly and the battery pack case described in the first aspect.

[0020] The battery pack box of the present invention has the following advantages compared with the prior art:

[0021] (1) The battery cell assembly includes at least two rows of cylindrical battery cells spaced apart in the vertical direction, the cylindrical battery cells are horizontally placed upside down in the battery cell placement area, the cylindrical battery cells are cooled by a vertically placed liquid cooling plate, the partition separates the two adjacent rows of cylindrical battery cells and fixes the cylindrical battery cells, the longitudinal space of the battery pack body can be fully utilized, and the energy density of the battery pack can be improved;

[0022] (2) A plurality of bearing parts matching the cylindrical surfaces of the cylindrical battery cells are provided on the top surface of the partition, so that a plurality of pressing parts are formed on the bottom surface of the partition, and the pressing parts are located between two adjacent bearing parts. The pressing parts are used to press the cylindrical battery cells located in the lower layer of the battery cell assembly. The bearing parts support the cylindrical battery cells in the upper layer, and the pressing parts press the cylindrical battery cells in the lower layer. While maintaining a certain distance between the cylindrical battery cells in each layer, the upper and lower layers of cylindrical battery cells are staggered in the horizontal direction, thereby improving the heat dissipation effect of the cylindrical battery cells;

[0023] (3) The pressure plate is connected to the top layer of cylindrical cells in the cell assembly through potting glue, so that the top layer of cylindrical cells is connected as a whole, thereby forming the liquid cooling plate, the pressure plate, and the cell assembly into a whole, with better integrity and higher structural strength;

[0024] (4) The pressing plate is located above two adjacent battery cell assemblies to simultaneously compress the topmost cylindrical battery cells in the two battery cell assemblies, thereby reducing parts and costs, and reducing assembly steps and improving assembly convenience. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 This is a three-dimensional diagram of the battery pack box (without the cover) of the present invention;

[0027] Figure 2 A three-dimensional diagram of the battery pack box of the present invention;

[0028] Figure 3 This is an exploded view of the battery pack box of the present invention;

[0029] Figure 4 This is a three-dimensional diagram of the top surface of the lower box body of the present invention;

[0030] Figure 5 It is a three-dimensional view of the bottom surface of the lower box body of the present invention;

[0031] Figure 6 A three-dimensional diagram of the partition of the present utility model;

[0032] Figure 7 This is a three-dimensional diagram of the liquid cooling plate, water inlet pipe and water outlet pipe of the present invention;

[0033] Figure 8 This is a cross-sectional view of the liquid cooling plate, water inlet pipe and water outlet pipe of the present invention.

[0034] Explanation of reference numerals: 1-lower box, 2-cover plate, 3-partition plate, 4-liquid cooling plate, 5-water inlet pipe, 6-water outlet pipe, 7-pressing plate, 8-potting glue, 9-hoisting part;

[0035] 100-battery cell assembly, 101-cylindrical battery cell;

[0036] 11- bottom plate, 111- battery cell placement area, 112- first reinforcement rib, 113- electrical component arrangement area, 114- third reinforcement rib, 12- side plate, 121- second reinforcement rib, 13- grille reinforcement plate;

[0037] 31-bearing part, 32-pressing part;

[0038] 41-cooling channel;

[0039] 51-water inlet;

[0040] 61-water outlet;

[0041] 91-lifting hole, 92-fourth reinforcement rib. DETAILED DESCRIPTION

[0042] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0043] Reference Figures 1-8 As shown, the first embodiment of the present invention provides a battery pack box, including a lower box 1, a cover plate 2, a partition 3 and a liquid cooling plate 4, wherein:

[0044] The lower box body 1 is provided with a cell placement area 111 for placing the cell assembly 100; the cell assembly 100 includes at least two rows of cylindrical cells 101 spaced apart in the vertical direction, and the cylindrical cells 101 are horizontally inverted; the lower box body 1 is made of glass fiber composite material, specifically PA6-GF45, which can reduce the weight of the battery pack box body and also make the battery pack box body have better structural strength, thereby taking into account the structural strength and lightweight design of the battery pack box body; the lower box body 1 is provided with a grid reinforcement plate 13 to form a cell placement area 111 and an electrical component arrangement area 113 inside the lower box body 1,

[0045] The partition 3 is horizontally mounted on the lower box 1, the partition 3 is separated between two adjacent rows of cylindrical battery cells 101, and is used to fix the cylindrical battery cells 101; the liquid cooling plate 4 is vertically mounted in the lower box 1, the liquid cooling plate 4 is perpendicular to the bottom surface of the lower box 1, and the battery cell assemblies 100 are respectively pasted on both sides of the liquid cooling plate 4, the bottom surface of the cylindrical battery cell 101 is bonded to the liquid cooling plate 4 by thermal conductive adhesive, and a water inlet pipe 5 and a water outlet pipe 6 are respectively provided on both sides of the liquid cooling plate 4, the water inlet pipe 5 is provided with a water inlet 51 for inputting water, and the water outlet pipe 6 is provided with a water outlet 61 for outputting water, and a cooling flow channel 41 is provided inside the liquid cooling plate 4;

[0046] The cover plate 2 is detachably connected to the lower box body 1, which is convenient for disassembly and installation.

[0047] The battery pack case proposed in this embodiment includes at least two rows of cylindrical battery cells 101 arranged at intervals in the vertical direction through the battery cell assembly 100. The cylindrical battery cells 101 are horizontally placed upside down in the battery cell placement area 111. The cylindrical battery cells 101 are cooled by the vertically placed liquid cooling plate 4. The partition 3 separates the two adjacent rows of cylindrical battery cells 101 and fixes the cylindrical battery cells 101. The longitudinal space of the battery pack case can be fully utilized to improve the energy density of the battery pack.

[0048] In some embodiments, the top surface of the partition 3 is provided with a plurality of bearing portions 31 that match the cylindrical surfaces of the cylindrical battery cells 101, so that a plurality of pressing portions 32 are formed on the bottom surface of the partition 3. The pressing portions 32 are located between two adjacent bearing portions 31 and are used to compress the cylindrical battery cells 101 located in the lower layer of the battery cell assembly 100. The bearing portions 31 support the cylindrical battery cells 101 in the upper layer, and the pressing portions 32 compress the cylindrical battery cells 101 in the lower layer. While maintaining a certain distance between the cylindrical battery cells 101 in each layer, the upper and lower layers of the cylindrical battery cells 101 are staggered in the horizontal direction, thereby improving the heat dissipation effect of the cylindrical battery cells 101.

[0049] In some embodiments, the battery pack case further includes a pressing plate 7, which is connected to the topmost layer of cylindrical cells 101 in the cell assembly 100 via a potting compound 8. By connecting the pressing plate 7 to the topmost layer of cylindrical cells 101 in the cell assembly 100 via the potting compound 8, the topmost layer of cylindrical cells 101 is connected as a whole, thereby forming the liquid cooling plate 4, the pressing plate 7, and the cell assembly 100 into a whole, thereby improving integrity and increasing structural strength.

[0050] In some embodiments, the pressing plate 7 is located above two adjacent battery cell assemblies 100 to simultaneously compress the topmost layer of cylindrical battery cells 101 in the two battery cell assemblies 100. By positioning the pressing plate 7 above two adjacent battery cell assemblies 100 to simultaneously compress the topmost layer of cylindrical battery cells 101 in the two battery cell assemblies 100, the number of parts can be reduced, costs can be lowered, assembly steps can be reduced, and assembly convenience can be improved.

[0051] In some embodiments, the lower case 1 includes a bottom plate 11 and four side plates 12, each of which is perpendicularly connected to the four edges of the bottom plate 11. The battery cell placement area 111 is located on the bottom plate 11, and the top surface of the bottom plate 11 is provided with first reinforcing ribs 112 that crisscross horizontally and vertically. The four side plates 12 are perpendicularly connected to the four edges of the bottom plate 11 to form the lower case 1 with an open top. The top surface of the bottom plate is provided with first reinforcing ribs 112 that crisscross horizontally and vertically to enhance the strength of the top surface of the bottom plate 11 to meet the capacity of carrying the battery cell assembly 100.

[0052] In some embodiments, the side panels 12 are provided with second reinforcing ribs 121 that are staggered in both horizontal and vertical directions. By providing the second reinforcing ribs 121 that are staggered in both horizontal and vertical directions on the side panels 12, the side panels 12 are further strengthened, thereby further improving the overall structural strength of the lower box body 1 and improving reliability.

[0053] In some embodiments, the bottom plate 11 is further provided with an electrical component arrangement area 113. By providing the electrical component arrangement area 113 on the bottom plate 11, electrical components are installed in the electrical component arrangement area 113, which can facilitate the connection of the electrical components with the wiring harness of the cylindrical battery cells 101, making the wiring harness in the battery pack more neat and beautiful.

[0054] In some embodiments, the bottom surface of the bottom plate 11 is provided with staggered third reinforcing ribs 114, which can improve the bottom surface strength of the bottom plate 11, further enhance the load-bearing capacity of the bottom plate 11, and improve the reliability of the battery pack casing. The third reinforcing ribs 114 can be arranged at a certain angle to the first reinforcing ribs 112. For example, in this embodiment, the third reinforcing ribs 114 are arranged at a 45-degree angle to the first reinforcing ribs 112, which can achieve staggered load-bearing and improve the load-bearing capacity of the bottom plate 11.

[0055] In some embodiments, the side panels 12 are provided with a lifting portion 9. Each side panel 12 is provided with a lifting portion 9, each of which is provided with a lifting hole 91. This ensures that the side panels 12 and bottom panel 11 are evenly stressed during lifting, thereby improving reliability and stability. The bottom surface of the lifting portion 9 can be provided with a hollow structure, and fourth reinforcing ribs 92 can be provided to support and strengthen the surrounding areas of the lifting hole 91, thereby improving reliability and stability.

[0056] The working principle of the battery pack case is: the battery cell assembly 100 is pasted on both sides of the liquid cooling plate 4, the bottom layer of cylindrical battery cells 101 is pasted on the bottom plate 11, the partition 3 is installed, and a layer of cylindrical battery cells 101 is placed on the partition 3. The cylindrical battery cells 101 of the lower layer are compressed by the compression part 32, and the bearing part 31 supports the cylindrical battery cells 101 of the upper layer. The cylindrical battery cells 101 are horizontally inverted in the battery cell placement area 111, and the cylindrical battery cells 101 are cooled by the vertically placed liquid cooling plate 4. The partition 3 separates the two adjacent rows of cylindrical battery cells 101 and fixes the cylindrical battery cells 101, which can make full use of the longitudinal space of the battery pack case and improve the energy density of the battery pack.

[0057] Based on the same concept, a second embodiment of the present invention provides a battery pack, including a battery cell assembly 100 and the battery pack case described in the first embodiment.

[0058] In the battery pack proposed in this embodiment, the cylindrical battery cells 101 are horizontally placed upside down in the battery cell placement area 111, and the cylindrical battery cells 101 are cooled by the vertically placed liquid cooling plate 4. The partition 3 separates two adjacent rows of cylindrical battery cells 101 and fixes the cylindrical battery cells 101, which can fully utilize the longitudinal space of the battery pack case and improve the energy density of the battery pack.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A battery pack box, characterized in that: It comprises a lower box (1), a cover plate (2), a partition plate (3) and a liquid cooling plate (4), wherein: The lower box (1) is provided with a cell placement area (111) for placing a cell assembly (100), wherein the cell assembly (100) comprises at least two rows of cylindrical cells (101) spaced apart in a vertical direction, and the cylindrical cells (101) are placed upside down horizontally; The partition (3) is horizontally mounted on the lower box (1), the partition (3) is separated between two adjacent rows of cylindrical battery cells (101), and is used to fix the cylindrical battery cells (101); The liquid cooling plate (4) is vertically installed in the lower box (1), and the battery core components (100) are respectively adhered to both sides of the liquid cooling plate (4); The cover plate (2) is detachably connected to the lower box body (1).

2. The battery pack case according to claim 1, wherein: The top surface of the partition (3) is provided with a plurality of bearing portions (31) matching the cylindrical surface of the cylindrical battery cell (101), so that a plurality of pressing portions (32) are formed on the bottom surface of the partition (3), and the pressing portions (32) are located between two adjacent bearing portions (31). The pressing portions (32) are used to press the cylindrical battery cell (101) located at the lower layer in the battery cell assembly (100).

3. The battery pack case according to claim 2, wherein: It also includes a pressing plate (7), which is connected to the uppermost cylindrical battery cell (101) in the battery cell assembly (100) via a potting adhesive (8).

4. The battery pack case according to claim 3, wherein: The pressing plate (7) is located above two adjacent battery core assemblies (100) to simultaneously press the uppermost layer of cylindrical battery cores (101) in the two battery core assemblies (100).

5. The battery pack case according to claim 1, wherein: The lower box (1) comprises a bottom plate (11) and four side plates (12), the four side plates (12) being respectively connected vertically to the four sides of the bottom plate (11), the battery cell placement area (111) being located on the bottom plate (11), and the top surface of the bottom plate (11) being provided with first reinforcing ribs (112) that are staggered in transverse and longitudinal directions.

6. The battery pack case according to claim 5, wherein: The side plate (12) is provided with second reinforcing ribs (121) that are staggered in both horizontal and vertical directions.

7. The battery pack case according to claim 6, wherein: An electrical component arrangement area (113) is also provided on the bottom plate (11).

8. The battery pack case according to claim 7, wherein: The bottom surface of the bottom plate (11) is provided with staggered third reinforcing ribs (114).

9. The battery pack case according to any one of claims 5 to 8, wherein: A hoisting portion (9) is provided on the side plate (12).

10. A battery pack, characterized in that: It comprises a battery cell assembly (100) and a battery pack case as described in any one of claims 1 to 9.

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