CTP battery pack with non-independent liquid cooling structure

Abstract

The utility model discloses a CTP battery pack with a non-independent liquid cooling structure, relates to the technical field of battery packs, and solves the problems of poor heat exchange effect, complex process and high installation requirement of a battery pack in the prior art. The battery pack comprises a shell, a battery cell group and a liquid cooling assembly, the battery cell group and the liquid cooling assembly are located in the shell, the battery cell group comprises a plurality of single battery cells stacked in sequence, each single battery cell comprises a battery cell shell and a battery cell material packaged in the battery cell shell, and the liquid cooling assembly comprises a liquid inlet pipeline, a liquid outlet pipeline and a liquid cooling pipeline. The liquid inlet pipeline and the liquid outlet pipeline extend out of the shell, liquid cooling pipelines are arranged in the battery cell shell and are close to the inner bottom wall and the inner side wall of the battery cell shell, and a water inlet and a water outlet of each liquid cooling pipeline extend out of the battery cell shell and are respectively communicated with the liquid inlet pipeline and the liquid outlet pipeline. The power battery pack is simple in process, low in installation requirement and good in heat exchange effect, and is more suitable for the quick charging technology.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery packs, and in particular relates to a CTP battery pack with a non-independent liquid cooling structure. Background Art

[0002] The current power battery technologies mainly include large module battery packs, CTP battery packs, and even more advanced CTB technologies. For different battery pack technologies, there are many forms of liquid cooling system technologies, mainly harmonica tube liquid cooling, stamping liquid cooling plate liquid cooling, inflation liquid cooling plate liquid cooling, machined liquid cooling plate liquid cooling, profile stir friction welding liquid cooling plate liquid cooling, parallel flow tube belt liquid cooling plate liquid cooling, etc. Different liquid cooling methods have their own suitable whole package systems. When designing, different liquid cooling structures need to be selected according to the whole package thermal simulation requirements and installation and other structural environments.

[0003] In general, these different liquid cooling plates are relatively independent structures, which are connected in the whole package by mechanical installation. Among them, the harmonica tube liquid cooling structure is simple but the heat exchange effect is poor and the load-bearing capacity is weak; the stamped liquid cooling plate has good heat exchange effect but the manufacturing process is complex and the installation requirements are high; the inflated liquid cooling plate is similar to the stamped liquid cooling plate, but the strength is low; the profile stir friction welding liquid cooling plate has good heat exchange effect, but the manufacturing process is complex; the parallel flow tube belt liquid cooling plate has good heat exchange effect, but the manufacturing process is complex and is suitable for cylindrical cells. With the gradual application of the current power battery fast charging technology, the requirements for the liquid cooling system in the power battery pack are getting higher and higher.

[0004] Therefore, we propose a CTP battery pack with a non-independent liquid cooling structure to solve the above technical problems. Utility Model Content

[0005] In order to solve the technical problems of poor heat exchange effect, complex process and high installation requirements of the battery pack in the above-mentioned prior art, the utility model proposes a CTP battery pack with a non-independent liquid cooling structure.

[0006] The technical solution adopted by the utility model is as follows:

[0007] A CTP battery pack with a non-independent liquid cooling structure comprises a shell and a battery cell group and a liquid cooling component located in the shell, wherein the battery cell group comprises a plurality of single battery cells stacked in sequence, wherein the single battery cell comprises a battery cell shell and a battery cell material encapsulated in the battery cell shell, and the liquid cooling component comprises a liquid inlet pipeline, a liquid outlet pipeline and a liquid cooling pipeline, wherein the liquid inlet pipeline and the liquid outlet pipeline both extend out of the shell, and the battery cell shell is provided with a liquid cooling pipeline, wherein the liquid cooling pipeline is arranged near the inner bottom wall and the inner side wall of the battery cell shell, and the water inlet and the water outlet of the liquid cooling pipeline both extend out of the battery cell shell and are respectively connected to the liquid inlet pipeline and the liquid outlet pipeline.

[0008] In a further technical solution, the battery cell housing includes a matching lower shell and upper cover, the interior of the lower shell is provided with a cavity for accommodating battery cell materials, the inner wall of the lower shell is provided with an outwardly protruding groove, and the liquid cooling pipeline is installed in the groove.

[0009] In a further technical solution, the two sides of the lower shell are combined with the groove to form a concave surface and a convex surface respectively, and the concave surfaces and convex surfaces of adjacent lower shells are complementary in shape.

[0010] In a further technical solution, the liquid cooling pipeline includes a liquid cooling main channel and a liquid cooling branch channel, the liquid cooling branch channel is connected to the liquid cooling main channel, the liquid cooling main channel is installed on the inner bottom wall of the battery cell housing, and the liquid cooling branch channel is installed on the inner side wall of the battery cell housing, and the ends of the liquid cooling main channel and the liquid cooling branch channel both extend out of the battery cell housing and are respectively connected to the liquid inlet pipeline and the liquid outlet pipeline.

[0011] In a further technical solution, cooling plates are provided on both sides of the battery cell group, and the liquid inlet pipeline and the liquid outlet pipeline are both in contact with the cooling plates.

[0012] In a further technical solution, the shell includes a lower box assembly, a box plate and a sealing gasket, the battery cells are installed in groups in the lower box assembly, the box plate is connected to the top surface of the lower box assembly by bolts, and a sealing gasket is installed between the box plate and the battery cells.

[0013] In a further technical solution, the lower box assembly includes a bottom guard plate, a bottom support plate and a frame, the bottom support plate is connected to the inside of the frame, and the frame is mounted on the bottom guard plate.

[0014] In a further technical solution, a cushioning foam is provided between the bottom support plate and the bottom guard plate.

[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0016] 1. The utility model integrates the traditional independent liquid cooling system of the power battery pack on each single cell, thereby forming a non-independent liquid cooling structure. There is no need to consider the installation and fixation of a separate liquid cooling plate, which is convenient for the grouping and fixing of the cells into the box. From the perspective of the heat exchange effect of the battery pack, the independent liquid cooling plate is usually liquid-cooled at the bottom of the cell, and the heat exchange can only take into account the bottom side of the cell. The liquid cooling pipeline of the utility model can take into account the heat exchange of the four side walls of the cell on the basis of liquid cooling the bottom area of ​​the cell, thereby optimizing the heat exchange effect of the entire battery pack to the greatest extent, and is more suitable for power battery packs under fast charging technology, thereby effectively solving the technical problems of poor heat exchange effect, complex process and high installation requirements of the battery pack in the prior art.

[0017] 2. The utility model uses outwardly protruding grooves to keep the inner wall of the battery cell shell flat, thereby facilitating the stacking of the internal battery cell diaphragms. The concave and convex surfaces formed by the lower shell and the grooves are complementary to each other. After the single battery cells are stacked, a certain pre-pressure is applied to them, so that the battery cells grouped in an ideal state become a rigid body. The battery cells grouped can be installed in the shell without excessive clamping force, which is convenient for use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be described by way of examples with reference to the accompanying drawings, in which:

[0019] Figure 1 It is a schematic diagram of the explosion structure of the utility model;

[0020] Figure 2 for Figure 1 A local enlarged schematic diagram of the middle A;

[0021] Figure 3 It is a schematic diagram of the structure of a single battery cell of the utility model;

[0022] Figure 4 This is a schematic diagram of the structure of the internal liquid cooling pipeline of the single battery cell of the utility model;

[0023] Figure 5 It is a schematic diagram of the concave and convex surface shapes on the single cell of the utility model;

[0024] Figure 6 It is a structural schematic diagram of the lower box assembly of the utility model.

[0025] Figure markings: 1-shell, 101-lower box assembly, 102-box plate, 103-sealing gasket, 2-battery cell shell, 201-lower shell, 202-upper cover, 3-liquid inlet pipeline, 4-liquid outlet pipeline, 5-liquid cooling pipeline, 501-liquid cooling main channel, 502-liquid cooling branch channel, 6-concave surface, 7-convex surface, 8-cooling plate, 9-bottom guard plate, 10-bottom support plate, 11-frame. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] Embodiment 1:

[0028] See also Figure 1This embodiment provides a CTP battery pack with a non-independent liquid cooling structure, including a housing 1 and a battery cell group and a liquid cooling component located in the housing 1, wherein the battery cell group includes a plurality of single battery cells stacked in sequence, and the single battery cell includes a battery cell housing 2 and a battery cell material encapsulated in the battery cell housing 2, see Figure 2 and Figure 4 The liquid cooling assembly includes a liquid inlet pipeline 3, a liquid outlet pipeline 4 and a liquid cooling pipeline 5. The liquid inlet pipeline 3 and the liquid outlet pipeline 4 both extend out of the shell 1. The battery cell shell 2 is provided with a liquid cooling pipeline 5. The liquid cooling pipeline 5 is arranged close to the inner bottom wall and the inner side wall of the battery cell shell 2. The water inlet and the water outlet of the liquid cooling pipeline 5 both extend out of the battery cell shell 2 and are respectively connected with the liquid inlet pipeline 3 and the liquid outlet pipeline 4.

[0029] Specifically, the liquid inlet pipeline 3 is connected to the vehicle coolant outside the battery pack, and the coolant flowing in from the liquid inlet pipeline 3 is divided into each liquid cooling pipeline 5, thereby entering each single cell in the battery cell group, and then, the coolant circulates through the liquid cooling pipeline 5 inside the battery cell housing 2 for one cycle and flows out, and merges into the liquid outlet pipeline 4, thereby flowing out of the battery pack, thereby realizing liquid cooling heat exchange of the battery pack. This embodiment integrates the traditional independent liquid cooling system of the power battery pack on each single battery cell to form a non-independent liquid cooling structure. There is no need to consider the installation and fixation of a separate liquid cooling plate, which is convenient for grouping and fixing the battery cells into a box. From the perspective of the heat exchange effect of the battery pack, an independent liquid cooling plate is usually liquid-cooled at the bottom of the battery cell, and the heat exchange can only take into account one side of the bottom of the battery cell. The liquid cooling pipeline 5 of the utility model can take into account the heat exchange of the four side walls of the battery cell on the basis of liquid cooling the bottom area of ​​the battery cell, thereby optimizing the heat exchange effect of the entire battery pack to the greatest extent, and is more suitable for a power battery pack under fast charging technology, thereby effectively solving the technical problems of poor heat exchange effect, complex process and high installation requirements of the battery pack in the prior art.

[0030] In this embodiment, see Figure 4 The liquid cooling pipeline 5 includes a liquid cooling main channel 501 and a liquid cooling branch channel 502. The liquid cooling branch channel 502 is connected to the liquid cooling main channel 501. The liquid cooling main channel 501 is installed on the inner bottom wall of the battery cell housing 2. The liquid cooling branch channel 502 is installed on the inner side wall of the battery cell housing 2. The ends of the liquid cooling main channel 501 and the liquid cooling branch channel 502 both extend out of the battery cell housing 2 and are respectively connected to the liquid inlet pipeline 3 and the liquid outlet pipeline 4.

[0031] Specifically, the liquid-cooling main channel 501 and the liquid-cooling branch channel 502 can almost cover the bottom and surrounding walls of the battery cell at the same time, which greatly enhances the heat exchange capacity of the battery cell and is convenient for use.

[0032] In this embodiment, see Figure 1 and Figure 2Cooling plates 8 are provided on both sides of the battery cell group, and the liquid inlet pipeline 3 and the liquid outlet pipeline 4 are both in contact with the cooling plates 8.

[0033] Specifically, cooling plates 8 are installed only on both sides of the battery cell group to reduce the temperature of the coolant. Compared with the traditional independent liquid cooling plate structure, there is no need to consider the installation and fixation of the individual liquid cooling plates, which is conducive to stacking single battery cells into battery cell groups and convenient for installation.

[0034] Embodiment 2:

[0035] This embodiment is obtained by further optimizing the embodiment 1. Figure 3 and Figure 4 The battery cell housing 2 includes a matching lower shell 201 and an upper cover plate 202. The interior of the lower shell 201 is provided with a cavity for accommodating battery cell materials. The inner wall of the lower shell 201 is provided with an outwardly protruding groove, and the liquid cooling pipeline 5 is installed in the groove.

[0036] Specifically, the inner wall of the battery cell housing 2 can be kept flat by the outwardly protruding groove, thereby facilitating the stacking of the internal battery cell separators.

[0037] In this embodiment, see Figure 5 The two sides of the lower shell 201 are combined with the groove to form a concave surface 6 and a convex surface 7 respectively, and the concave surface 6 and the convex surface 7 of the adjacent lower shells 201 are complementary in shape.

[0038] Specifically, the concave surface 6 and the convex surface 7 formed by the lower shell 201 and the groove are in an adjacent complementary state. After the single battery cells are stacked, a certain pre-pressure is applied to them, so that the battery cells group becomes a rigid body under ideal conditions. The battery cells group can be installed in the shell 1 without excessive clamping force, which is convenient for use.

[0039] Embodiment 3:

[0040] This embodiment is obtained by further optimizing the embodiment 1 or the embodiment 2. Figure 1 The housing 1 includes a lower box assembly 101, a box plate 102 and a sealing gasket 103. The battery cells are grouped and installed in the lower box assembly 101. The box plate 102 is connected to the top surface of the lower box assembly 101 by bolts. A sealing gasket 103 is installed between the box plate 102 and the battery cells.

[0041] Specifically, the housing 1 is composed of a lower box assembly 101, a box plate 102 and a sealing gasket 103, which are connected by bolts, so that it is convenient to assemble and disassemble and is easy to use.

[0042] In this embodiment, see Figure 6The lower box assembly 101 includes a bottom guard plate 9, a bottom support plate 10 and a frame 11. The bottom support plate 10 is connected to the inside of the frame 11, and the frame 11 is installed on the bottom guard plate 9.

[0043] Specifically, the bottom support plate 10 is connected to the inside of the frame 11 to provide support force for the battery cells. The lower box assembly 101 is enclosed as a whole by the bottom guard plate 9 and the frame 11, which effectively provides installation space and protection for the battery cells.

[0044] In this embodiment, a cushioning foam is provided between the bottom support plate 10 and the bottom guard plate 9 .

[0045] Specifically, the buffer foam disposed between the bottom support plate 10 and the bottom guard plate 9 further improves the buffering effect and reduces damage to the battery caused by collision.

[0046] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A CTP battery pack with a non-independent liquid cooling structure, characterized in that: The invention comprises a shell (1) and a battery cell group and a liquid cooling component located in the shell (1), wherein the battery cell group comprises a plurality of single battery cells stacked in sequence, wherein the single battery cell comprises a battery cell shell (2) and a battery cell material encapsulated in the battery cell shell (2), and the liquid cooling component comprises a liquid inlet pipeline (3), a liquid outlet pipeline (4) and a liquid cooling pipeline (5), wherein the liquid inlet pipeline (3) and the liquid outlet pipeline (4) both extend out of the shell (1), and the battery cell shell (2) is provided with a liquid cooling pipeline (5), wherein the liquid cooling pipeline (5) is arranged close to the inner bottom wall and the inner side wall of the battery cell shell (2), and the water inlet and the water outlet of the liquid cooling pipeline (5) both extend out of the battery cell shell (2) and are respectively connected to the liquid inlet pipeline (3) and the liquid outlet pipeline (4).

2. According to claim 1, a CTP battery pack with a non-independent liquid cooling structure is characterized in that: The battery cell housing (2) comprises a matching lower shell (201) and an upper cover plate (202); a cavity capable of accommodating battery cell materials is provided inside the lower shell (201); an outwardly protruding groove is provided on the inner side wall of the lower shell (201); and the liquid cooling pipeline (5) is installed in the groove.

3. A CTP battery pack with a non-independent liquid cooling structure according to claim 2, characterized in that: The two sides of the lower shell (201) are respectively combined with the groove to form a concave surface (6) and a convex surface (7), and the concave surfaces (6) and convex surfaces (7) of adjacent lower shells (201) are complementary in shape.

4. A CTP battery pack with a non-independent liquid cooling structure according to any one of claims 1 to 3, characterized in that: The liquid cooling pipeline (5) comprises a liquid cooling main channel (501) and a liquid cooling shunt channel (502); the liquid cooling shunt channel (502) is connected to the liquid cooling main channel (501); the liquid cooling main channel (501) is installed on the inner bottom wall of the battery cell housing (2); the liquid cooling shunt channel (502) is installed on the inner side wall of the battery cell housing (2); the ends of the liquid cooling main channel (501) and the liquid cooling shunt channel (502) both extend out of the battery cell housing (2) and are respectively connected to the liquid inlet pipeline (3) and the liquid outlet pipeline (4).

5. The CTP battery pack with a non-independent liquid cooling structure according to claim 1, characterized in that: Cooling plates (8) are provided on both sides of the battery cell group, and the liquid inlet pipeline (3) and the liquid outlet pipeline (4) are both in contact with the cooling plates (8).

6. The CTP battery pack with a non-independent liquid cooling structure according to claim 1, characterized in that: The housing (1) comprises a lower box assembly (101), a box plate (102) and a sealing gasket (103); the battery cells are installed in groups in the lower box assembly (101); the box plate (102) is connected to the top surface of the lower box assembly (101) by bolts; and a sealing gasket (103) is installed between the box plate (102) and the battery cells.

7. The CTP battery pack with a non-independent liquid cooling structure according to claim 6, characterized in that: The lower box assembly (101) comprises a bottom guard plate (9), a bottom support plate (10) and a frame (11); the bottom support plate (10) is connected to the inside of the frame (11), and the frame (11) is mounted on the bottom guard plate (9).

8. The CTP battery pack with a non-independent liquid cooling structure according to claim 7, characterized in that: Buffer foam is provided between the bottom support plate (10) and the bottom guard plate (9).

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