Fully-immersed battery pack

Abstract

The utility model provides a full-immersion type battery pack, which relates to the technical field of battery packs, and comprises a box body, the box body is internally provided with a first accommodating space, the first accommodating space is of a cylindrical structure, the box body is provided with a liquid inlet and a liquid outlet, and the liquid inlet and the liquid outlet are used for circularly introducing a liquid cooling medium into the first accommodating space; and the plurality of battery modules are fixedly mounted in the first accommodating space. According to the battery pack disclosed by the utility model, the first accommodating space is of the cylindrical structure, so that the pressure generated by the liquid cooling medium in the first accommodating space can be uniformly distributed, and the problem of deformation or damage caused by stress concentration at corners and planes in a traditional square box body is avoided. Under the condition that the wall thickness of the box body is not increased or reinforcing ribs are not used, enough pressure-resistant performance is provided, and the structural integrity and the sealing performance of the box body are guaranteed.

Description

Technical Field

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

[0002] A fully immersed battery pack is to completely immerse the battery module in a liquid cooling medium to achieve efficient heat conduction of the battery module and improve the heat dissipation effect of the battery module.

[0003] Currently, the liquid cooling medium is usually circulated into the interior of the battery pack box. During the circulation process, the liquid cooling medium has a certain pressure. At present, since most of the battery pack boxes are square boxes, when the pressurized liquid cooling medium is introduced into the battery pack box, the pressure is unevenly distributed in the plane and corner areas of the box. The plane part will bear a large bending stress, and due to stress concentration at the corners, higher local stress may be generated. This stress concentration phenomenon will cause deformation of the box body. Especially under high pressure, the sealing performance will also be affected. Therefore, in order to cope with the pressure, the square box needs to increase the wall thickness or use reinforcing ribs to enhance the structural strength, which not only increases the material and manufacturing costs, but also may lead to an increase in weight and a reduction in the overall efficiency of the system. Summary of the Utility Model

[0004] In view of this, the utility model provides a fully immersed battery pack to solve the problems of uneven stress distribution and insufficient pressure resistance of the square battery box in a pressurized liquid cooling medium environment.

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

[0006] The utility model provides a fully immersed battery pack, including:

[0007] A box body, the interior of which has a first accommodation space, the first accommodation space is of a cylindrical structure, and the box body is provided with a liquid inlet and a liquid outlet, and the liquid inlet and the liquid outlet are used for circulating the liquid cooling medium into the first accommodation space;

[0008] A plurality of battery modules, fixedly installed in the first accommodation space.

[0009] On the basis of the above technical solution, preferably, the box body includes a shell and a box cover, the first accommodation space is opened on one side of the shell in the horizontal direction, and the box cover is detachably connected to the opening of the first accommodation space for opening or sealing the first accommodation space.

[0010] Furthermore, preferably, a plurality of support plates are fixedly arranged at intervals in the vertical direction in the first accommodation space, a plurality of battery modules are fixedly installed on the upper surface of each support plate, and the length direction of the battery module is parallel to the axial direction of the first accommodation space.

[0011] Further, preferably, the liquid inlet is arranged at the top end of the housing, the liquid outlet is arranged at the bottom end of the housing, and a plurality of through holes are formed in the support plate.

[0012] Based on the above technical solution, preferably, there is a gap between two adjacent battery modules on the upper surface of the support plate, and there is also a gap between the battery module and the support plate.

[0013] Based on the above technical solution, preferably, the support plate is fixed with a pair of pallet plates, the battery module is fixedly arranged between the two pallet plates, the pallet plate includes a horizontal section and a vertical section vertically connected to the horizontal section, the bottom surface of the battery module is in contact with the horizontal section, and one side in the width direction of the battery module is in contact with the vertical section.

[0014] Based on the above technical solution, the battery module includes a battery pack, end plates, straps and spacers. The battery pack is formed by stacking a plurality of single cells. The spacers are arranged between the single cells to form a channel for the liquid cooling medium to pass through between two adjacent single cells. There are two end plates, which are respectively located at both ends in the length direction of the battery pack, and the straps surround the outer peripheral sides of the battery pack and the end plates.

[0015] Further, preferably, there are two groups of the spacers symmetrically arranged on both sides in the width direction of the single cell. The spacer includes a vertical plate, a partition plate and a bottom plate. The bottom plate is vertically fixed to the bottom end of the vertical plate. The partition plate is vertically arranged between the vertical plate and the bottom plate, and the partition plate is vertically and fixedly connected to the vertical plate and the bottom plate. The partition plate is located between the single cells. The vertical plate is in contact with the side wall in the width direction of the battery pack, and the vertical plate is in contact with the bottom surface of the battery pack. The partition plates on both sides in the width direction of the battery pack are arranged at intervals.

[0016] Preferably, a second accommodation space is further arranged on one side in the horizontal direction of the housing for installing electrical components. The second accommodation space is located below the first accommodation space, and a cover is detachably connected to the opening of the second accommodation space.

[0017] The utility model has the following beneficial effects compared with the prior art:

[0018] (1) By setting the first accommodation space as a cylindrical structure, the pressure generated by the liquid cooling medium in the first accommodation space can be evenly distributed, avoiding the deformation or damage problems caused by stress concentration at the corners and planes in the traditional square box. The box body can provide sufficient pressure resistance without increasing the wall thickness or using reinforcing ribs, ensuring the structural integrity and sealing performance of the box body.

[0019] (2) Due to the natural compressive capacity of the cylindrical structure, the additional requirement for material strength is reduced, avoiding the need for additional reinforcing ribs and thicker walls in a square box. This not only reduces the amount of material used, but also decreases the manufacturing cost, and lightens the overall weight of the battery pack, improving the system efficiency.

[0020] (3) By arranging multiple support plates at intervals in the vertical direction, the multi-layer arrangement of the battery modules can be achieved, maximizing the use of the internal volume of the first accommodation space. This compact design enables more battery modules to be accommodated in a limited space, enhancing the energy density of the battery pack.

[0021] (4) By fixedly arranging a pair of support plates on the support plate, since the horizontal section of the support plate is arranged on the upper surface of the support plate and contacts the bottom surface of the battery module, this design naturally forms a gap between the battery module and the support plate. This gap provides an additional path for the flow of the liquid cooling medium, enabling the liquid cooling medium to flow through the bottom area of the battery module. In addition, the bottom surface of the battery module contacts the horizontal section of the support plate, ensuring the stability of the battery module in the vertical direction, and one side of the battery module in the width direction contacts the vertical section of the support plate, providing additional lateral support and further enhancing the fixing effect of the battery module.

[0022] (5) Through the arrangement of the isolation member, a channel for the liquid cooling medium to pass through can be formed between two adjacent single cells. Thus, the liquid cooling medium flowing from top to bottom can pass through the channel to dissipate heat from the large surface of the single cell, improving the heat dissipation efficiency of the battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0024] Figure 1 is a three-dimensional structural schematic diagram of the battery pack disclosed by the present invention;

[0025] Figure 2 is a schematic diagram of the internal structure of the box disclosed by the present invention;

[0026] Figure 3 is a top view of the battery pack disclosed by the present invention;

[0027] Figure 4 is Figure 3 a plane cross-sectional view taken along line A-A in

[0028] Figure 5 For Figure 4 Partial enlarged view at position B in

[0029] Figure 6 Schematic three-dimensional structure diagram of the battery module disclosed by the present utility model;

[0030] Reference numerals:

[0031] 1, box body; 2, battery module; 11, housing; 12, box cover; 111, first accommodating space; 112, liquid inlet; 113, liquid outlet; 3, support plate; 31, through hole; 32, support plate; 321, horizontal section; 322, vertical section; 21, battery pack; 22, end plate; 23, binding strap; 24, separator; 211, single cell; 241, vertical plate; 242, partition; 243, bottom plate; 114, second accommodating space; 13, cover. Specific embodiments

[0032] Next, in combination with the embodiments of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0033] As Figure 1 shown, in combination with Figures 2-4 , the present utility model discloses a fully immersed battery pack, including a box body 1 and a plurality of battery modules 2.

[0034] Among them, the box body 1 has a first accommodating space 111 inside. The first accommodating space 111 is a cylindrical structure. The box body 1 is provided with a liquid inlet 112 and a liquid outlet 113. The liquid inlet 112 and the liquid outlet 113 are used to circulate a liquid cooling medium into the first accommodating space 111. A plurality of battery modules 2 are fixedly installed in the first accommodating space 111.

[0035] By adopting the above technical solution, by setting the first accommodating space 111 as a cylindrical structure, the pressure generated by the liquid cooling medium in the first accommodating space 111 can be evenly distributed, avoiding the deformation or damage problems caused by stress concentration at the corners and planes in the traditional square box body 1. The box body 1 can provide sufficient pressure resistance without increasing the wall thickness or using reinforcing ribs, ensuring the structural integrity and sealing performance of the box body 1.

[0036] During the circulation process, the liquid cooling medium can directly contact the surface of the battery module 2, enabling heat to be quickly conducted from the battery module 2 into the liquid cooling medium. The cylindrical space makes the flow of the liquid cooling medium smoother without dead ends, thus improving the heat dissipation effect of the battery module 2.

[0037] As some preferred embodiments, the box body 1 includes a housing 11 and a box cover 12. The first accommodation space 111 is opened on one side of the housing 11 in the horizontal direction. Thus, it is convenient to install the battery module 2 into the first accommodation space 111 on one side of the housing 11 in the horizontal direction, and at the same time, it is also convenient for horizontal disassembly during later maintenance. The box cover 12 is detachably connected to the opening of the first accommodation space 111 and is used to open or seal the first accommodation space 111. The detachable design of the box cover 12 not only provides a convenient way of maintenance and installation but also ensures that the first accommodation space 111 can be reliably sealed after installation to prevent the leakage of the liquid cooling medium.

[0038] In addition, since the box cover 12 can be detached, the operator can conveniently open the battery pack to perform maintenance, inspection, and replacement of the internal battery module 2, improving the maintainability and service life of the battery pack.

[0039] To facilitate the installation and fixation of the battery module 2 in the first accommodation space 111, referring to Figure 2 、 4 and Figure 5 shown, in this embodiment, a plurality of support plates 3 are fixedly arranged at intervals in the vertical direction in the first accommodation space 111. A plurality of battery modules 2 are fixedly installed on the upper surface of each support plate 3, and the length direction of the battery module 2 is parallel to the axial direction of the first accommodation space 111.

[0040] Adopting the above technical solution, by arranging a plurality of support plates 3 at intervals in the vertical direction, the multi-layer arrangement of the battery modules 2 can be realized, maximizing the utilization of the internal volume of the first accommodation space 111. This compact design enables more battery modules 2 to be accommodated in a limited space, improving the energy density of the battery pack.

[0041] Based on the above technical solution, the liquid inlet 112 is arranged at the top end of the housing 11, and the liquid outlet 113 is arranged at the bottom end of the housing 11. A plurality of through holes 31 are opened on the support plate 3. Adopting the above technical solution, the liquid cooling medium flows from top to bottom under the action of gravity. This flow path ensures that the liquid cooling medium can cover all the battery modules 2. The through holes 31 on the support plate 3 further optimize the flow of the liquid cooling medium, enabling the liquid to pass through each layer of the support plate 3 to ensure that all layers of the battery modules 2 can be fully cooled. In this way, the liquid cooling medium not only forms a good circulation in the first accommodation space 111 but also avoids the possible dead ends of liquid flow caused by the existence of the support plate 3, thus improving the heat dissipation efficiency.

[0042] As some preferred embodiments, referring to the attached Figure 4 and 5 As shown, there is a gap between two adjacent battery modules 2 on the upper surface of the support plate 3, and the liquid cooling medium can flow more freely, thereby effectively surrounding and cooling each battery module 2. This design avoids the flow blockage of the liquid cooling medium and ensures that each battery module 2 in the battery pack can be evenly cooled. There is a gap between the battery module 2 and the support plate 3, so that the liquid cooling medium can not only flow through the side of the battery module 2, but also flow through the bottom of the battery module 2, which can ensure that all surfaces of the battery module 2 can be fully cooled and avoid local heat accumulation.

[0043] In order to fix the battery module 2 and at the same time make a certain gap exist between the battery module 2 and the support plate 3. In this embodiment, paired support plates 32 are fixedly arranged on the support plate 3, and the two support plates 32 in each pair of support plates 32 are symmetrically arranged at intervals. The battery module 2 is fixedly arranged between the two support plates 32. The support plate 32 includes a horizontal section 321 and a vertical section 322 vertically connected to the horizontal section 321. The whole support plate 32 is in an L-shaped structure. The bottom surface of the battery module 2 is in contact with the horizontal section 321, and one side in the width direction of the battery module 2 is in contact with the vertical section 322.

[0044] With the above technical solution, since the horizontal section 321 of the support plate 32 is arranged on the upper surface of the support plate 3 and is in contact with the bottom surface of the battery module 2, this design naturally forms a gap between the battery module 2 and the support plate 3. This gap provides an additional path for the flow of the liquid cooling medium, enabling the liquid cooling medium to flow through the bottom area of the battery module 2. In addition, the bottom surface of the battery module 2 is in contact with the horizontal section 321 of the support plate 32 to ensure the stability of the battery module 2 in the vertical direction, and one side in the width direction of the battery module 2 is in contact with the vertical section 322 of the support plate 32, providing additional lateral support and further enhancing the fixing effect of the battery module 2.

[0045] This embodiment shows a preferred structural form of the battery module 2. Referring to the attached Figure 6As shown in the figure, it includes a battery pack 21, end plates 22, straps 23 and spacers 24. The battery pack 21 is formed by stacking a plurality of single cells 211. The spacers 24 are arranged between the single cells 211 to form a channel for the liquid cooling medium to pass through between two adjacent single cells 211. With this arrangement, the liquid cooling medium flowing from top to bottom can pass through the channel to dissipate heat from the large surface of the single cell 211. Since there is a gap between the battery modules 2, the side surfaces of the single cells 211 can be cooled. There are two end plates 22, which are respectively located at both ends in the length direction of the battery pack 21. The straps 23 surround the outer peripheral sides of the battery pack 21 and the end plates 22. The end plates 22 are provided to fix the battery pack 21 and enhance the structural stability of the battery pack 21. The straps 23 surround the outer peripheral sides of the battery pack 21 and the end plates 22 to fasten the entire battery module 2 together, further increasing the stability of the battery module 2.

[0046] In order to form a channel for the liquid cooling medium to pass through between two adjacent single cells 211 by the spacer 24, a preferred structural form of the spacer 24 is shown in this embodiment. Specifically, there are two sets of spacers 24 symmetrically arranged, which are respectively located on both sides in the width direction of the single cell 211. The spacer 24 includes a vertical plate 241, a partition plate 242 and a bottom plate 243.

[0047] The vertical plate 241 is vertically arranged and contacts the side wall in the width direction of the battery pack 21 to play a role in fixing the battery pack 21 in the width direction. The bottom plate 243 is vertically fixed at the bottom end of the vertical plate 241 to support the bottom surface of the battery module 2. The partition plate 242 is vertically arranged between the vertical plate 241 and the bottom plate 243, and the partition plate 242 is vertically and fixedly connected to the vertical plate 241 and the bottom plate 243. The partition plate 242 is located between the single cells 211. The partition plates 242 on both sides in the width direction of the battery pack 21 are arranged at intervals. Thus, a channel for the liquid cooling medium to pass through is formed between the two partition plates 242 and two adjacent single cells 211, ensuring that the liquid cooling medium can flow through the gaps between each single cell 211 to provide effective cooling.

[0048] It should be noted that the above-mentioned spacer 24 is made of insulating material to prevent short circuits between the single cells 211.

[0049] As some embodiments, a second accommodation space 114 is further provided on one side of the housing 11 in the horizontal direction for installing electrical components. The second accommodation space 114 is located below the first accommodation space 111. This structural arrangement can effectively separate the battery module 2 and the electrical components, avoiding mutual interference between the electrical components and the battery module 2. A cover 13 is detachably connected to the opening of the second accommodation space 114. The detachable cover 13 facilitates the installation, maintenance, and replacement of the electrical components. The user can easily open the cover 13 to inspect and operate the electrical components without affecting the overall sealing performance and protection performance of the first accommodation space 111.

[0050] Preferably, the lower end of the entire housing is of a square structure, and the upper end is of a semi-circular structure. With this setting, the first accommodation space is formed at the upper end of the housing, making the upper end of the housing form a cylindrical structure. Thus, the upper part of the box body is of a cylindrical structure. Due to the natural compressive capacity of the cylindrical structure, the additional requirement for the material strength is reduced, avoiding the situation where the square box body 1 requires additional reinforcing ribs and thicker walls. This not only reduces the amount of material used but also reduces the manufacturing cost and lightens the overall weight of the battery pack, improving the efficiency of the system.

[0051] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A fully immersed battery pack, characterized in that: include: A box body (1), wherein the box body (1) has a first accommodating space (111) inside, the first accommodating space (111) is a cylindrical structure, and the box body (1) is provided with a liquid inlet (112) and a liquid outlet (113), the liquid inlet (112) and the liquid outlet (113) being used to circulate a liquid cooling medium into the first accommodating space (111); A plurality of battery modules (2) are fixedly installed in the first accommodating space (111).

2. The fully submerged battery pack according to claim 1, characterized in that: The box body (1) comprises a shell (11) and a box cover (12); the first accommodating space (111) is opened on one side of the shell (11) in a horizontal direction; the box cover (12) is detachably connected to the opening of the first accommodating space (111) and is used to open or seal the first accommodating space (111).

3. The fully submerged battery pack according to claim 2, characterized in that: A plurality of support plates (3) are fixedly arranged at intervals in the vertical direction in the first accommodating space (111), a plurality of battery modules (2) are fixedly mounted on the upper surface of each of the support plates (3), and the length direction of the battery modules (2) is parallel to the axial direction of the first accommodating space (111).

4. The fully submerged battery pack according to claim 3, characterized in that: The liquid inlet (112) is arranged at the top end of the shell (11), the liquid outlet (113) is arranged at the bottom end of the shell (11), and a plurality of through holes (31) are provided on the support plate (3).

5. The fully submerged battery pack according to claim 3, characterized in that: There is a gap between two adjacent battery modules (2) on the upper surface of the support plate (3), and there is a gap between the battery module (2) and the support plate (3).

6. The fully submerged battery pack according to claim 5, characterized in that: The support plate (3) is fixed with a pair of supporting plates (32), the battery module (2) is fixedly arranged between the two supporting plates (32), the supporting plate (32) comprises a horizontal section (321) and a vertical section (322) vertically connected to the horizontal section (321), the bottom surface of the battery module (2) is in contact with the horizontal section (321), and one side of the battery module (2) in the width direction is in contact with the vertical section (322).

7. The fully submerged battery pack according to claim 6, characterized in that: The battery module (2) comprises a battery pack (21), an end plate (22), a binding band (23) and an isolating member (24); the battery pack (21) is formed by a plurality of single cells (211) arranged in layers; the isolating member (24) is arranged between the single cells (211) and is used to form a channel for a liquid cooling medium to pass through between two adjacent single cells (211); two end plates (22) are provided, respectively located at two ends of the battery pack (21) in the length direction; and the binding band (23) surrounds the battery pack (21) and the outer peripheral side of the end plate (22).

8. The fully submerged battery pack according to claim 7, characterized in that: The isolating members (24) are symmetrically arranged in two groups, respectively located on both sides of the width direction of the single battery (211). The isolating members (24) include a vertical plate (241), a partition (242) and a bottom plate (243). The bottom plate (243) is vertically fixed to the bottom end of the vertical plate (241). The partition (242) is vertically arranged between the vertical plate (241) and the bottom plate (243). The partition (242) is vertically fixedly connected to the vertical plate (241) and the bottom plate (243). The partition (242) is located between the single battery (211). The vertical plate (241) is in contact with the side wall of the battery group (21) in the width direction. The vertical plate (241) is in contact with the bottom surface of the battery group (21). The partitions (242) on both sides of the battery group (21) in the width direction are arranged at intervals.

9. The fully submerged battery pack according to claim 2, characterized in that: A second accommodating space (114) is also provided on one side of the shell (11) in the horizontal direction for installing electrical components. The second accommodating space (114) is located below the first accommodating space (111). A cover (13) is detachably connected to the opening of the second accommodating space (114).

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