Battery pack

Abstract

The utility model provides a battery pack, which belongs to the technical field of battery packs, and comprises a box body, a liquid cooling assembly, a first battery pack and a second battery pack, a partition plate is arranged in the box body, and the partition plate divides the interior of the box body into an upper layer cavity and a lower layer cavity along the height direction of the box body; the liquid cooling assemblies are arranged in the upper-layer cavity and the lower-layer cavity respectively, each liquid cooling assembly comprises a plurality of liquid cooling plates arranged at intervals, and a containing cavity is formed between every two adjacent liquid cooling plates; the first battery pack comprises a plurality of first battery cells, and the plurality of first battery cells are respectively arranged in the accommodating cavities in the upper-layer cavity; the second battery pack comprises a plurality of second battery cells; the plurality of second battery cells are respectively arranged in the accommodating cavities in the lower-layer cavity; and the liquid cooling plate performs liquid cooling on the first battery cell and the second battery cell. The liquid cooling plate of the liquid cooling assembly cools the first battery cell and the second battery cell, the large surface of each battery cell is in contact with the liquid cooling plate, the contact area is large, and the liquid cooling effect on the first battery pack and the second battery pack is guaranteed.

Description

Technical Field

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

[0002] The CTP (cell to pack) solution refers to a module-free solution, which directly integrates battery cells into a battery pack, eliminating the intermediate module link, improving the space utilization rate inside the battery pack and reducing production costs.

[0003] In order to meet the requirements of a compact space inside the battery pack while increasing the number of battery cells and system voltage, a double-layer battery cell group has emerged at the present stage. Patent document CN220774518U discloses a battery pack with a double-layer battery module, which stacks two battery modules in a battery pack box body and sets a double-sided heat exchange plate between the upper and lower layers of battery modules for heat dissipation. However, this heat dissipation method has a small contact area with the battery module and cannot achieve the best heat dissipation effect. Summary of the Utility Model

[0004] Therefore, the technical problem to be solved by the utility model is to overcome the defect of poor heat dissipation effect in the battery pack with a double-layer battery cell group in the prior art, so as to provide a battery pack.

[0005] To solve the above technical problem, the utility model provides a battery pack, including:

[0006] A box body, a partition is arranged inside the box body, and the partition divides the inside of the box body into an upper cavity and a lower cavity along its height direction;

[0007] A liquid cooling component, which is respectively arranged in the upper cavity and the lower cavity, and the liquid cooling component includes a plurality of liquid cooling plates arranged at intervals, and a receiving cavity is formed between two adjacent liquid cooling plates;

[0008] A first battery group, including a plurality of first battery cells, and the plurality of first battery cells are respectively arranged in the receiving cavities in the upper cavity;

[0009] A second battery group, including a plurality of second battery cells, and the plurality of second battery cells are respectively arranged in the receiving cavities in the lower cavity; the liquid cooling plates perform liquid cooling on the first battery cells and the second battery cells.

[0010] In one embodiment, the liquid cooling component further includes an inlet liquid plate and an outlet liquid plate, the inlet liquid plate is connected to the inlet ports of the plurality of liquid cooling plates, and the outlet liquid plate is connected to the outlet ports of the plurality of liquid cooling plates.

[0011] In one embodiment, a surrounding structure is provided around the partition board, and avoiding grooves are provided at the liquid inlet end of the liquid inlet plate and the liquid outlet end of the liquid outlet plate to avoid the surrounding structure.

[0012] In one embodiment, the first battery cell and the liquid cooling plate, and the second battery cell and the liquid cooling plate are connected by a first bonding member.

[0013] In one embodiment, a glue-limiting member is provided outside the first bonding member to limit the flow of the first bonding member.

[0014] In one embodiment, the pole columns of the first battery pack are arranged upward, the first battery pack and the partition board are connected by a second bonding member, a first gap is provided between the first battery pack and the top plate of the box body, and the CCS (integrated bus bar) assembly of the first battery pack is arranged in the first gap.

[0015] In one embodiment, the pole columns of the second battery pack are arranged upward, the second battery pack and the bottom plate of the box body are connected by a third bonding member, a second gap is provided between the second battery pack and the partition board, and the CCS assembly of the second battery pack is arranged in the second gap.

[0016] In one embodiment, the pole columns of the second battery pack are arranged downward, the second battery pack and the partition board are connected by a fourth bonding member, a third gap is provided between the second battery pack and the bottom plate of the box body, and the CCS assembly of the second battery pack is arranged in the third gap.

[0017] In one embodiment, a convex member is provided on the side plate of the box body, and the convex member is detachably connected to the partition board.

[0018] In one embodiment, the partition board is made of aluminum material.

[0019] The technical solution of the present utility model has the following advantages:

[0020] The battery pack provided by the present utility model includes a box body, a liquid cooling component, a first battery pack and a second battery pack. A partition board is arranged inside the box body, and the partition board divides the inside of the box body into an upper cavity and a lower cavity along the height direction. Two liquid cooling components are respectively arranged in the upper cavity and the lower cavity. The liquid cooling component includes a plurality of liquid cooling plates arranged at intervals, and accommodation cavities are formed between adjacent liquid cooling plates. The first battery cells of the first battery pack are arranged in the accommodation cavities in the upper cavity, and the second battery cells of the second battery pack are arranged in the accommodation cavities in the lower cavity.

[0021] By providing liquid cooling components in the upper cavity and the lower cavity respectively, the liquid cooling plates of the liquid cooling components cool down the first battery cells and the second battery cells. The large surfaces of each battery cell are in contact with the liquid cooling plates, and the large contact area ensures the liquid cooling effect on the first battery pack and the second battery pack. At the same time, the temperature reduction among multiple first battery cells and multiple second battery cells is consistent, and the temperature balance is good. Brief Description of the Drawings

[0022] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 Structural schematic diagram of an embodiment of the battery pack provided in Embodiment 1 of the present invention;

[0024] Figure 2 For Figure 1 Structural schematic diagram of the middle box body and the partition board;

[0025] Figure 3 For Figure 1 Structural schematic diagram of the liquid cooling component;

[0026] Figure 4 For Figure 1 Structural schematic diagram of the cooperation between the liquid cooling component and the battery cells;

[0027] Figure 5 For Figure 1 Structural schematic diagram of the partition board;

[0028] Figure 6 For Figure 1 Cross-sectional structural schematic diagram;

[0029] Figure 7 Cross-sectional structural schematic diagram of the battery pack provided in Embodiment 2 of the present invention.

[0030] Description of the reference numerals:

[0031] 1. Box body; 2. Partition board; 3. Upper cavity; 4. Lower cavity; 5. Liquid cooling plate; 6. Accommodation cavity; 7. First battery cell; 8. Second battery cell; 9. Liquid inlet plate; 10. Liquid outlet plate; 11. Enclosure structure; 12. Avoidance groove; 13. First gap; 14. Second gap; 15. Third gap; 16. Boss member; 17. Connecting plate. Specific Embodiments

[0032] The technical solution of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative work belong to the scope of protection of the present utility model.

[0033] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model 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 thus should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0034] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", "connection" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0035] In addition, the technical features involved in different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0036] Embodiment 1

[0037] The battery pack provided in this embodiment is a battery pack with a double-layer battery group, and both the upper and lower battery groups have good heat dissipation effects.

[0038] Such as Figures 1 to 4As shown in the figure, a specific implementation of the battery pack provided in this embodiment includes a box body 1, a liquid cooling component, a first battery pack, and a second battery pack. A partition 2 is provided inside the box body 1, and the partition 2 divides the inside of the box body 1 into an upper cavity 3 and a lower cavity 4 along its height direction; the liquid cooling component is respectively provided in the upper cavity 3 and the lower cavity 4, and the liquid cooling component includes a plurality of liquid cooling plates 5 arranged at intervals, and an accommodation cavity 6 is formed between two adjacent liquid cooling plates 5; the first battery pack includes a plurality of first battery cells 7, and the plurality of first battery cells 7 are respectively arranged in the accommodation cavity 6 in the upper cavity 3; the second battery pack includes a plurality of second battery cells 8, and the plurality of second battery cells 8 are respectively arranged in the accommodation cavity 6 in the lower cavity 4; the liquid cooling plate 5 performs liquid cooling on the first battery cells 7 and the second battery cells 8.

[0039] By respectively arranging the liquid cooling components in the upper cavity 3 and the lower cavity 4, the liquid cooling plates 5 of the liquid cooling component cool down the first battery cells 7 and the second battery cells 8. The large surface of each battery cell is in contact with the liquid cooling plate 5, and the contact area is large, which ensures the liquid cooling effect on the first battery pack and the second battery pack. At the same time, the temperature reduction among the plurality of first battery cells 7 and the plurality of second battery cells 8 is consistent, and the temperature balance is better.

[0040] Specifically, the liquid cooling plate 5 cools the large surfaces of the first battery cells 7 and the second battery cells 8. The large surface refers to the surface of the battery cell along its length direction; the liquid cooling plate 5 has a liquid cooling channel inside, and by sending a coolant into the liquid cooling channel, the temperature reduction of the battery cell is realized.

[0041] A specific implementation of the liquid cooling plate 5 is that the liquid cooling plate 5 is a hollow structure, and a plurality of flow channel plates are arranged inside it. The plurality of flow channel plates divide the inside of the liquid cooling plate 5 into a plurality of liquid cooling channels to further improve the heat exchange effect.

[0042] In addition, as an alternative implementation, no flow channel plate is provided in the liquid cooling plate 5, and only one liquid cooling channel is provided.

[0043] Among them, the first battery pack and the second battery pack have the same specifications and are arranged oppositely, which improves the space utilization rate.

[0044] As Figure 3 shown in the figure, for the battery pack provided in this embodiment, the liquid cooling component further includes an inlet liquid plate 9 and an outlet liquid plate 10. The inlet liquid plate 9 is connected to the inlet ports of the plurality of liquid cooling plates 5, and the outlet liquid plate 10 is connected to the outlet ports of the plurality of liquid cooling plates 5.

[0045] The arrangement of the inlet liquid plate 9 and the outlet liquid plate 10 makes the temperature reduction process of the plurality of liquid cooling plates 5 synchronous, avoiding uneven temperature among each battery cell.

[0046] Specifically, a plurality of first openings are provided on the side wall of the liquid inlet plate 9, and a plurality of second openings are provided on the side wall of the liquid outlet plate 10. The first openings are communicated with the liquid inlet of the liquid cooling plate 5, and the second openings are communicated with the liquid outlet of the liquid cooling plate 5. The liquid inlet plate 9 and the liquid outlet plate 10 are arranged in parallel, and the liquid inlet end of the liquid inlet plate 9 and the liquid outlet end of the liquid outlet plate 10 are located on the same side of the box body 1, which is convenient for installing structures such as pipelines, and the structure is more compact.

[0047] A total liquid inlet and a total liquid outlet are provided on the side plate of the box body 1. The liquid inlet end of the liquid inlet plate 9 is connected to the total liquid inlet through a pipeline, and the liquid outlet end of the liquid outlet plate 10 is connected to the total liquid outlet through a pipeline.

[0048] As Figure 3 and Figure 5 shown, for the battery pack provided in this embodiment, a surrounding structure 11 is provided around the partition 2, and avoiding grooves 12 are provided at the liquid inlet end of the liquid inlet plate 9 and the liquid outlet end of the liquid outlet plate 10 to avoid the surrounding structure 11.

[0049] The setting of the surrounding structure 11 facilitates the positioning and installation of the battery pack.

[0050] The height of the surrounding structure 11 is lower than the height of the first battery pack to facilitate the installation of the liquid inlet plate 9 and the liquid outlet plate 10. Specifically, the liquid inlet plate 9 and the liquid outlet plate 10 are in a knife-shaped structure.

[0051] In addition, as an alternative embodiment, the liquid inlet plate 9 and the liquid outlet plate 10 are not provided with avoiding grooves 12, and the pipelines are used to cross over the surrounding structure 11 to realize the connection with the liquid inlet plate 9 and the liquid outlet plate 10.

[0052] For the battery pack provided in this embodiment, between the first battery cell 7 and the liquid cooling plate 5, and between the second battery cell 8 and the liquid cooling plate 5, they are connected through a first bonding member, and the first bonding member makes the contact between the battery cell and the liquid cooling plate 5 closer.

[0053] Specifically, the first bonding member is a thermal conductive adhesive. The thermal conductive adhesive has good thermal conductivity, which can enable the heat generated by the battery cell to be exchanged with the liquid cooling plate 5 to the greatest extent to achieve cooling. Moreover, the thermal conductive adhesive has strong adhesive force, and has insulation and chemical corrosion resistance.

[0054] For the battery pack provided in this embodiment, a glue limiting member is provided outside the first bonding member to limit the flow of the first bonding member. Specifically, the glue limiting member is a glue limiting strip, which can be in a linear strip structure, an arc strip structure, etc. The glue limiting member, the surface of the battery cell and the liquid cooling plate enclose a bonding space, and the first bonding member is filled in the bonding space.

[0055] As Figure 6As shown, for the battery pack provided in this embodiment, the pole columns of the first battery group are arranged upward. The first battery group and the partition 2 are connected by a second bonding member. A first gap 13 is provided between the first battery group and the top plate of the box body 1, and the CCS assembly of the first battery group is arranged in the first gap 13.

[0056] The use of the second bonding member ensures the stability of the connection between the first battery group and the partition 2. The top plate of the box body 1 is the upper cover body. By opening the upper cover body, the first battery group can be conveniently repaired or taken out.

[0057] Specifically, the second bonding member is a structural adhesive. The structural adhesive can stably fix the first battery group and prevent the first battery cell 7 of the first battery group from being affected by vibration during use, and can better protect the first battery cell 7 of the first battery group. In addition, the second bonding member is also a thermal conductive adhesive.

[0058] As Figure 6 shown, for the battery pack provided in this embodiment, the pole columns of the second battery group are arranged upward. The second battery group and the bottom plate of the box body 1 are connected by a third bonding member. A second gap 14 is provided between the second battery group and the partition 2, and the CCS assembly of the second battery group is arranged in the second gap 14.

[0059] Specifically, the third bonding member is the same as the above-mentioned second bonding member. The second gap 14 is between the second battery group and the partition 2. When the second battery group needs to be repaired, first open the upper cover body of the box body 1, and then take out the partition 2 together with the first battery group to expose the second battery group for repair.

[0060] As Figure 2 shown, for the battery pack provided in this embodiment, a boss member 16 is provided on the side plate of the box body 1, and the boss member 16 is detachably connected to the partition 2.

[0061] The detachable connection between the boss member 16 and the partition 2 facilitates the installation and processing in the lower cavity 4. Specifically, as Figure 5 shown, connecting plates 17 are arranged at intervals around the partition 2. Through holes are provided on the connecting plates 17. The connecting plates 17 are lapped on the boss member 16, and the connecting plates 17 and the boss member 16 are connected by bolts.

[0062] For the battery pack provided in this embodiment, the partition 2 is made of aluminum material. Specifically, the partition 2 is an aluminum plate, and the aluminum plate has good thermal conductivity, is not easily corroded and has a light weight.

[0063] Embodiment 2

[0064] As Figure 7As shown, in the battery pack provided in this embodiment, the pole posts of the second battery pack are arranged downward. The second battery pack and the partition 2 are connected by a fourth bonding member. A third gap 15 is provided between the second battery pack and the bottom plate of the box body 1. The CCS component of the second battery pack is arranged in the third gap 15. The settings of other structures are the same as those described in Embodiment 1.

[0065] Specifically, the fourth bonding member is the same as the second bonding member described in Embodiment 1. The second battery pack and the partition 2 are bonded. When the second battery pack needs to be repaired, first open the upper cover of the box body 1, and then take out the partition 2 together with the first battery pack and the second battery pack at the same time, and then perform repair treatment.

[0066] Obviously, the above embodiments are only examples for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. A battery pack, characterized in that, Comprising: A box body (1), inside which a partition board (2) is arranged, and the partition board (2) divides the inside of the box body (1) into an upper cavity (3) and a lower cavity (4) along its height direction; A liquid cooling assembly, which is respectively arranged in the upper cavity (3) and the lower cavity (4), and the liquid cooling assembly includes a plurality of liquid cooling plates (5) arranged at intervals, and a receiving cavity (6) is formed between two adjacent liquid cooling plates (5); A first battery pack, which includes a plurality of first battery cells (7), and the plurality of first battery cells (7) are respectively arranged in the receiving cavities (6) in the upper cavity (3); A second battery pack, which includes a plurality of second battery cells (8), and the plurality of second battery cells (8) are respectively arranged in the receiving cavities (6) in the lower cavity (4); the liquid cooling plates (5) perform liquid cooling on the first battery cells (7) and the second battery cells (8).

2. The battery pack according to claim 1, wherein The liquid cooling assembly further includes an inlet liquid plate (9) and an outlet liquid plate (10), the inlet liquid plate (9) is connected to the inlet ports of the plurality of liquid cooling plates (5), and the outlet liquid plate (10) is connected to the outlet ports of the plurality of liquid cooling plates (5).

3. The battery pack according to claim 2, wherein, A surrounding structure (11) is arranged around the partition board (2), and avoiding grooves (12) are arranged at the inlet port end of the inlet liquid plate (9) and the outlet port end of the outlet liquid plate (10) to avoid the surrounding structure (11).

4. The battery pack according to claim 1, wherein, A first bonding member is used to connect between the first battery cell (7) and the liquid cooling plate (5), and between the second battery cell (8) and the liquid cooling plate (5).

5. The battery pack according to claim 4, wherein, A glue limiting member is arranged outside the first bonding member to limit the flow of the first bonding member.

6. The battery pack according to claim 1, characterized in that, The pole posts of the first battery pack are arranged upward, the first battery pack and the partition board (2) are connected by a second bonding member, a first gap (13) is arranged between the first battery pack and the top plate of the box body (1), and the CCS assembly of the first battery pack is arranged in the first gap (13).

7. The battery pack according to claim 6, characterized in that, The pole posts of the second battery pack are arranged upward, the second battery pack and the bottom plate of the box body (1) are connected by a third bonding member, a second gap (14) is arranged between the second battery pack and the partition board (2), and the CCS assembly of the second battery pack is arranged in the second gap (14).

8. The battery pack according to claim 6, wherein The pole posts of the second battery pack are arranged downward, the second battery pack and the partition board (2) are connected by a fourth bonding member, a third gap (15) is arranged between the second battery pack and the bottom plate of the box body (1), and the CCS assembly of the second battery pack is arranged in the third gap (15).

9. The battery pack according to claim 1, characterized in that, A boss member (16) is arranged on the side plate of the box body (1), and the boss member (16) is detachably connected to the partition board (2).

10. The battery pack according to claim 1, wherein, The partition board (2) is made of an aluminum material.

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