Battery pack with CTP structure

Abstract

The utility model belongs to the technical field of new energy automobile batteries, and discloses a battery pack with a CTP structure, which comprises a battery pack box body and a battery cell battery pack formed by combining a plurality of single battery cells, and further comprises a cooling plate and a liquid cooling plate which are internally provided with liquid accommodating cavities, the liquid cooling plate is arranged between the battery cell battery pack and the inner bottom surface of the battery pack box body; in the battery cell battery pack, two large surfaces of each single battery cell are connected with a cooling plate through a heat-conducting structural adhesive, and two adjacent single battery cells are respectively connected with two large surfaces of the same cooling plate through the heat-conducting structural adhesive; and the single battery cells and / or the cooling plate are / is connected with the liquid cooling plate through the heat-conducting structural adhesive. According to the utility model, liquid cooling of large surfaces on two sides and the bottom of the grouped battery cells can be realized, and the space of the CTP structure is utilized to the greatest extent to realize the heat exchange effect on the battery cells.

Description

Technical Field

[0001] The utility model belongs to the technical field of new energy vehicle batteries, and particularly relates to a CTP structure battery pack. Background Art

[0002] Currently, new energy vehicles are developing rapidly. With the gradual increase of market expectations, the requirements of users for new energy vehicles are increasing, and with the development needs of the new energy vehicle technology itself, the technological innovation of new energy vehicle battery packs is also advancing with each passing day.

[0003] As a battery pack that provides the energy source for new energy vehicles, the size of its capacity and the ability of rapid charging are important indicators that determine whether it can gain a foothold in the current market. Therefore, the mainstream technical route of the battery pack is also developing towards the CTP structure form. The structural characteristics of CTP enable the battery pack to accommodate more battery cells, bringing an increase in the overall capacity of the pack. However, at the same time, the requirements for the thermal management system of the battery pack are also significantly improved. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a CTP structure battery pack to solve the above problems existing in the prior art.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A CTP structure battery pack includes a battery pack box body and a battery cell group composed of multiple single battery cells. The battery cell group is installed in the battery pack box body, and also includes a cooling plate and a liquid cooling plate both provided with liquid containing cavities inside. The liquid cooling plate is installed between the battery cell group and the inner bottom surface of the battery pack box body; in the battery cell group, two large surfaces of each single battery cell are connected with a cooling plate through a thermal conductive structural adhesive, wherein two adjacent single battery cells are respectively connected with two large surfaces of the same cooling plate through a thermal conductive structural adhesive; the single battery cell and / or the cooling plate are connected with the liquid cooling plate through a thermal conductive structural adhesive.

[0007] As a preferred technical solution in the utility model, the battery pack box body includes an upper cover plate, a box body frame and a bottom guard plate which are sequentially connected from top to bottom. Sealing gaskets are arranged between the box body frame and the upper cover plate and the bottom guard plate; the liquid cooling plate is installed on the bottom guard plate, a support plate is installed inside the box body frame, a support surface is arranged at the upper end of the support plate, and the upper end of the battery cell group abuts against the support surfaces of the two support plates through buffer foams; a cooling system inlet and a cooling system outlet are arranged at the front end of the box body frame.

[0008] As a preferred technical solution in the utility model, the support plate includes a side support plate and an intermediate support plate, the side support plates are installed on both sides of the box frame, the middle of the box frame is connected to the intermediate support plate, and a battery cell pack is arranged between each side support plate and the adjacent intermediate support plate; when at least two intermediate support plates are provided, a battery cell pack is arranged between two adjacent intermediate support plates.

[0009] As a preferred technical solution in the utility model, a front block support beam arranged near the front end of the box frame is detachably connected in the box frame, and the front block support beam is abutted against the support plate and / or the cooling plate at one end of the battery cell pack; a first cavity is formed between the front block support beam and the box wall at the front end of the box frame, and both ends of the front block support beam are detachably connected to the box frame through an L-shaped fixing bracket, and the L-shaped fixing bracket is arranged in the first cavity.

[0010] As a preferred technical solution in the utility model, a cooling plate liquid inlet pipeline and a cooling plate liquid outlet pipeline are respectively arranged on both sides of the battery cell battery pack, one side of all cooling plates are connected to the cooling plate liquid inlet pipeline, and the other side of all cooling plates are connected to the cooling plate liquid outlet pipeline, and the inlet of the cooling plate liquid inlet pipeline and the outlet of the cooling plate liquid outlet pipeline are both located in the first cavity; a liquid cooling plate liquid inlet pipe joint and a liquid cooling plate liquid outlet pipe joint are arranged on the liquid cooling plate, and the liquid cooling plate liquid inlet pipe joint and the liquid cooling plate liquid outlet pipe joint are both located in the first cavity.

[0011] As a preferred technical solution in the utility model, the liquid cooling plate includes an upper plate of a liquid cooling plate, a flow channel plate, a liquid cooling plate liquid inlet pipe joint and a liquid cooling plate liquid outlet pipe joint, the flow channel plate is installed on the inner bottom surface of the battery pack box, the upper plate of the liquid cooling plate is sealed and installed on the upper end of the flow channel plate, and the single battery cell and / or the cooling plate is connected to the upper plate of the liquid cooling plate through a thermal conductive structural adhesive; a liquid inlet main channel and a liquid outlet main channel are provided on the flow channel plate, and the liquid inlet main channel is connected with the liquid outlet main channel through a plurality of branch channels, and a branch channel is correspondingly arranged under each single battery cell; the liquid cooling plate liquid inlet pipe joint and the liquid cooling plate liquid outlet pipe joint are both installed on the liquid cooling plate, and the liquid cooling plate liquid inlet pipe joint is connected with one end of the liquid inlet main channel, and the liquid cooling plate liquid outlet pipe joint is connected with one end of the liquid outlet main channel.

[0012] As a preferred technical solution in the present utility model, the support plate includes a main body and the support surface, the support surface is integrally formed on the side surface of the upper end of the main body, and the main body is connected to the box frame by welding.

[0013] As a preferred technical solution in the utility model, the sealing gasket is a U-shaped structure, and the sealing gasket between the bottom guard plate and the box frame is sealed between the liquid cooling plate and the box frame.

[0014] Beneficial effects: In the present utility model, cooling plates are connected to both large surfaces of each single cell through heat-conducting structural adhesives. Among them, two adjacent single cells are respectively connected to two large surfaces of the same cooling plate through heat-conducting structural adhesives, so that the cooling plate and the single cell are tightly combined together, facilitating efficient liquid cooling of both large surfaces of the single cell. Combined with the liquid cooling plate located at the bottom surface of the battery cell group, liquid cooling of both large surfaces and the bottom of the grouped cells can be achieved, maximizing the heat exchange effect of the cells by utilizing the space of the CTP structure to the greatest extent. Brief Description of the Drawings

[0015] Figure 1 is a three-dimensional schematic diagram of the present utility model;

[0016] Figure 2 is a connection schematic diagram among the battery cell group, the cooling plate and the liquid cooling plate in the present utility model;

[0017] Figure 3 is a structural schematic diagram of the box frame in the present utility model;

[0018] Figure 4 is a schematic diagram when the battery cell group is installed in the box frame in the present utility model;

[0019] Figure 5 is an internal structural schematic diagram of the liquid cooling plate in the present utility model.

[0020] In the figures: 1 - battery pack box; 101 - upper cover plate; 102 - box frame; 103 - bottom protection plate; 104 - sealing gasket; 105 - cooling system inlet; 106 - cooling system outlet; 107 - side support plate; 108 - intermediate support plate; 109 - front baffle support beam; 110 - L-shaped fixing bracket; 2 - single cell; 3 - cooling plate; 4 - liquid cooling plate; 401 - liquid cooling plate inlet pipe joint; 402 - liquid cooling plate outlet pipe joint; 403 - inlet main flow channel; 404 - outlet main flow channel; 405 - shunt channel; 5 - cooling plate inlet pipeline; 6 - cooling plate outlet pipeline. Detailed Description of the Embodiment

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the present utility model in combination with the drawings and the descriptions of the embodiments or the prior art. Obviously, the following descriptions of the structures of the drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. It should be noted here that the descriptions of these embodiment modes are used to help understand the present utility model, but do not constitute a limitation to the present utility model.

[0022] Embodiment:

[0023] As shown Figures 1 - 5 in the figure, this embodiment provides a CTP-structured battery pack, including a battery pack box body 1 and a battery cell battery pack composed of a plurality of single battery cells 2. The battery cell battery pack is installed in the battery pack box body 1. It also includes a cooling plate 3 and a liquid cooling plate 4 both internally provided with liquid accommodation cavities. The liquid cooling plate 4 is installed between the battery cell battery pack and the inner bottom surface of the battery pack box body 1 to cool the battery cell battery pack at the bottom of the battery cell battery pack; at least one battery cell battery pack is provided, and the following describes a single battery cell battery pack. In the battery cell battery pack, cooling plates 3 are connected to both large surfaces of each single battery cell 2 through heat-conducting structural adhesives. Among them, two adjacent single battery cells 2 are respectively connected to two large surfaces of the same cooling plate 3 through heat-conducting structural adhesives. Furthermore, each single battery cell 2 can be cooled through the cooling plate 3; the single battery cell 2 and / or the cooling plate 3 are connected to the liquid cooling plate 4 through heat-conducting structural adhesives. Preferably, both the single battery cell 2 and the cooling plate 3 are connected to the liquid cooling plate 4 through heat-conducting structural adhesives, thereby performing liquid cooling on both large surfaces and the bottom of the single battery cell 2.

[0024] In the present utility model, cooling plates 3 are connected to both large surfaces of each single battery cell 2 through heat-conducting structural adhesives. Among them, two adjacent single battery cells 2 are respectively connected to two large surfaces of the same cooling plate 3 through heat-conducting structural adhesives, so that the cooling plate 3 is tightly combined with the single battery cell 2 to facilitate efficient liquid cooling of both large surfaces of the single battery cell 2. Combining with the liquid cooling plate 4 located at the bottom surface of the battery cell battery pack, liquid cooling of both large surfaces and the bottom of the grouped battery cells can be realized, and the heat exchange effect of the battery cells can be achieved by making the most of the space of the CTP structure.

[0025] As a preferred implementation in this embodiment, it should be further explained that the battery pack box body 1 includes an upper cover plate 101, a box body frame 102, and a bottom protection plate 103 connected in sequence from top to bottom. The three cooperate to form a sealed box body. Sealing gaskets 104 are provided between the box body frame 102 and the upper cover plate 101 and the bottom protection plate 103 to ensure the sealing of the box body; the liquid cooling plate 4 is installed on the bottom protection plate 103. A support plate is installed inside the box body frame 102. A support surface is provided at the upper end of the support plate, which plays a role in fixing the battery cell battery pack by using the support surface. The upper end of the battery cell battery pack abuts against the support surfaces of the two support plates through buffer foams, which plays a role in preventing damage to the battery cell battery pack; a cooling system inlet 105 and a cooling system outlet 106 are provided at the front end of the box body frame 102 to facilitate inputting coolant into the box body and outputting the coolant out of the box body. It should be noted that in practice, the box body frame 102 can be assembled downward from the top of the battery cell battery pack through a lifting fixture to realize reverse installation of the battery cell battery pack into the box. Immediately afterwards, the liquid cooling plate 4 and the bottom protection plate 103 can be fixed to the box body frame 102 through bolts.

[0026] As a preferred implementation scheme in this embodiment, it needs to be further explained that the support plate includes a side support plate 107 and an intermediate support plate 108, the side support plates 107 are installed on both sides of the box frame 102, the middle support plate 108 is connected to the middle of the box frame 102, and a battery cell pack is arranged between each side support plate 107 and the adjacent intermediate support plate 108; when there are at least two intermediate support plates 108, a battery cell pack is arranged between two adjacent intermediate support plates 108, and then the number of intermediate support plates 108 is selected according to actual conditions to realize the installation of different numbers of battery cell packs.

[0027] As a preferred implementation scheme in this embodiment, it needs to be further explained that a front block support beam 109 arranged near the front end of the box frame 102 is detachably connected to the box frame 102, and the front block support beam 109 is abutted against the support plate and / or the cooling plate 3 at one end of the battery cell pack, thereby further enhancing the stability of the structure. Moreover, through the subsequent installation of the front block support beam 109, the battery cell packs can be safely stacked into the box, thereby solving the problem that the battery cell packs cannot be put into the box due to tolerances. A first cavity is formed between the front block support beam 109 and the box wall at the front end of the box frame 102, and both ends of the front block support beam 109 are detachably connected to the box frame 102 through an L-shaped fixing bracket 110, and the L-shaped fixing bracket 110 is arranged in the first cavity, thereby facilitating the layout of liquid cooling pipelines in the first cavity without affecting the stability of the battery cell pack.

[0028] As a preferred implementation scheme in this embodiment, it needs to be further explained that a cooling plate liquid inlet pipeline 5 and a cooling plate liquid outlet pipeline 6 are respectively arranged on both sides of the battery cell battery pack, one side of all cooling plates 3 is connected to the cooling plate liquid inlet pipeline 5, and the other side of all cooling plates 3 is connected to the cooling plate liquid outlet pipeline 6, thereby effectively ensuring the liquid cooling effect of the cooling plate 3 on the battery cell battery pack, the inlet of the cooling plate liquid inlet pipeline 5 and the outlet of the cooling plate liquid outlet pipeline 6 are both located in the first cavity, which is convenient for connecting the external input liquid cooling pipeline in the first cavity; a liquid cooling plate liquid inlet pipe joint 401 and a liquid cooling plate liquid outlet pipe joint 402 are arranged on the liquid cooling plate 4, and the liquid cooling plate liquid inlet pipe joint 401 and the liquid cooling plate liquid outlet pipe joint 402 are both located in the first cavity, which is convenient for uniformly setting the liquid cooling pipeline in the first cavity.

[0029] As a preferred implementation in this embodiment, it should be further noted that the liquid cooling plate 4 includes an upper liquid cooling plate, a flow channel plate, a liquid cooling plate inlet pipe joint 401, and a liquid cooling plate outlet pipe joint 402. The flow channel plate is installed on the inner bottom surface of the battery pack box body 1, and the upper liquid cooling plate is hermetically installed at the upper end of the flow channel plate. The single-cell battery 2 and / or the cooling plate 3 are connected to the upper liquid cooling plate through a thermally conductive structural adhesive to ensure stability and heat conduction effect. The flow channel plate is provided with an inlet main flow channel 403 and an outlet main flow channel 404, and the inlet main flow channel 403 and the outlet main flow channel 404 are connected through a plurality of shunt channels 405. A shunt channel 405 is correspondingly arranged below each single-cell battery 2. The liquid cooling plate inlet pipe joint 401 and the liquid cooling plate outlet pipe joint 402 are both installed on the liquid cooling plate, and the liquid cooling plate inlet pipe joint 401 is communicated with one end of the inlet main flow channel 403, and the liquid cooling plate outlet pipe joint 402 is communicated with one end of the outlet main flow channel 404, so that the liquid cooling of the battery cell group can be well carried out.

[0030] As a preferred implementation in this embodiment, it should be further noted that the support plate includes a main body and the support surface. The support surface is integrally formed on the side surface of the upper end of the main body, and the main body is connected to the box body frame 102 by welding to ensure the stability of the support plate.

[0031] As a preferred implementation in this embodiment, it should be further noted that the sealing gasket 104 is in an O-shaped structure, and the sealing gasket 104 between the bottom protection plate 103 and the box body frame 102 seals between the liquid cooling plate 4 and the box body frame 102. The structural layout is more reasonable, and the liquid cooling effect of the liquid cooling plate 4 can also be ensured.

[0032] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A CTP structure battery pack, comprising a battery pack box (1) and a battery cell battery pack composed of a plurality of single battery cells (2), wherein the battery cell battery pack is installed in the battery pack box (1), characterized in that: It also includes a cooling plate (3) and a liquid cooling plate (4) both of which are provided with a liquid containing cavity, and the liquid cooling plate (4) is installed between the battery cell group and the inner bottom surface of the battery pack box (1); In the battery pack, the two large surfaces of each single battery cell (2) are connected to a cooling plate (3) via a heat-conducting structural adhesive, wherein two adjacent single battery cells (2) are respectively connected to the two large surfaces of the same cooling plate (3) via the heat-conducting structural adhesive; and the single battery cells (2) and / or the cooling plate (3) are connected to a liquid cooling plate (4) via the heat-conducting structural adhesive.

2. A CTP structure battery pack according to claim 1, characterized in that: The battery pack box (1) comprises an upper cover plate (101), a box frame (102) and a bottom guard plate (103) which are connected in sequence from top to bottom, and a sealing gasket (104) is arranged between the box frame (102) and the upper cover plate (101) and the bottom guard plate (103); the liquid cooling plate (4) is installed on the bottom guard plate (103), a support plate is installed in the box frame (102), a support surface is arranged at the upper end of the support plate, and the upper end of the battery cell group is in contact with the support surfaces of the two support plates through a buffer foam; the front end of the box frame (102) is provided with a cooling system inlet (105) and a cooling system outlet (106).

3. A CTP structure battery pack according to claim 2, characterized in that: The support plate comprises a side support plate (107) and a middle support plate (108); the side support plates (107) are installed on both sides of the box frame (102); the middle of the box frame (102) is connected to the middle support plate (108); a battery cell battery pack is arranged between each side support plate (107) and an adjacent middle support plate (108); when at least two middle support plates (108) are arranged, a battery cell battery pack is arranged between two adjacent middle support plates (108).

4. A CTP structure battery pack according to claim 2 or 3, characterized in that: A front block support beam (109) disposed near the front end of the box frame (102) is detachably connected to the box frame (102), and the front block support beam (109) abuts against a support plate and / or a cooling plate (3) at one end of the battery pack; a first cavity is formed between the front block support beam (109) and the box wall at the front end of the box frame (102), and both ends of the front block support beam (109) are detachably connected to the box frame (102) via an L-shaped fixing bracket (110), and the L-shaped fixing bracket (110) is disposed in the first cavity.

5. A CTP structure battery pack according to claim 4, characterized in that: A cooling plate liquid inlet pipeline (5) and a cooling plate liquid outlet pipeline (6) are respectively arranged on both sides of the battery cell battery pack; one side of all cooling plates (3) is connected to the cooling plate liquid inlet pipeline (5); the other side of all cooling plates (3) is connected to the cooling plate liquid outlet pipeline (6); the inlet of the cooling plate liquid inlet pipeline (5) and the outlet of the cooling plate liquid outlet pipeline (6) are both located in the first cavity; a liquid cooling plate liquid inlet pipe joint (401) and a liquid cooling plate liquid outlet pipe joint (402) are arranged on the liquid cooling plate (4); the liquid cooling plate liquid inlet pipe joint (401) and the liquid cooling plate liquid outlet pipe joint (402) are both located in the first cavity.

6. A CTP structure battery pack according to claim 5, characterized in that: The liquid cooling plate (4) comprises an upper plate of the liquid cooling plate, a flow channel plate, a liquid cooling plate liquid inlet pipe joint (401) and a liquid cooling plate liquid outlet pipe joint (402); the flow channel plate is mounted on the inner bottom surface of the battery pack box (1); the upper plate of the liquid cooling plate is sealed and mounted on the upper end of the flow channel plate; the single battery cell (2) and / or the cooling plate (3) are connected to the upper plate of the liquid cooling plate via a heat-conducting structural adhesive; the flow channel plate is provided with a liquid inlet main channel (403) and a liquid outlet main channel (404); the liquid inlet main channel (403 ) is connected to a liquid outlet main channel (404) through a plurality of branch channels (405), and a branch channel (405) is correspondingly arranged below each single battery cell (2); the liquid cooling plate liquid inlet pipe joint (401) and the liquid cooling plate liquid outlet pipe joint (402) are both installed on the liquid cooling plate, and the liquid cooling plate liquid inlet pipe joint (401) is connected to one end of the liquid inlet main channel (403), and the liquid cooling plate liquid outlet pipe joint (402) is connected to one end of the liquid outlet main channel (404).

7. A CTP structure battery pack according to claim 2 or 3, characterized in that: The support plate comprises a main body and the support surface, the support surface is integrally formed on the side surface of the upper end of the main body, and the main body is connected to the box frame (102) by welding.

8. A CTP structure battery pack according to claim 2 or 3, characterized in that: The sealing gasket (104) is of a U-shaped structure, and the sealing gasket (104) between the bottom guard plate (103) and the box frame (102) is sealed between the liquid cooling plate (4) and the box frame (102).

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