Battery pack and vehicle

Abstract

The utility model relates to the technical field of batteries, and particularly discloses a battery pack and a vehicle, the battery pack comprises a shell assembly, a battery cell module and at least two cooling plates; the shell assembly comprises a first box body and a second box body, the second box body comprises a containing space with an opening, and the opening is covered with the first box body; the battery cell module is arranged in the accommodating space and comprises a plurality of battery cells which are arranged at intervals, the plurality of battery cells are arranged along a first direction to form a plurality of battery cell groups, each battery cell group consists of a plurality of battery cells which are arranged at intervals along a second direction, and each battery cell comprises two first side surfaces which are oppositely arranged and two second side surfaces which are oppositely arranged; the area of the first side is larger than that of the second side; in the third direction, one first side face is provided with a cooling plate, and the other first side face is provided with another cooling plate. The cooling plate is attached to the large-area first side face, so that the cooling area is increased, the heat dissipation path is shortened, the cooling efficiency is improved, and the machining cost of the cooling plate is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, concretely relates to a battery pack and vehicle. BACKGROUND

[0002] Charging anxiety has been a big pain point in vehicle development. Major vehicle brands have invested a lot of resources to solve this problem.

[0003] However, the battery pack currently used by the vehicle mostly has problems such as low cooling efficiency and high cost. INVENTION CONTENTS

[0004] The application provides a battery pack and a vehicle, which can reduce the processing cost of the cooling plate and improve the cooling efficiency.

[0005] To solve the above technical problems, one technical scheme of the application is to provide a battery pack, which comprises a shell assembly, a battery cell module and at least two cooling plates; the shell assembly comprises a first box body and a second box body, the second box body comprises a containing space with an opening, and the first box body cover is arranged at the opening; the battery cell module is arranged in the containing space, the battery cell module comprises a plurality of spaced battery cells, the plurality of battery cells are arranged into a plurality of battery cell groups along a first direction, each battery cell group is composed of a plurality of battery cells arranged along a second direction, each battery cell comprises two oppositely arranged first sides and two oppositely arranged second sides, and the area of the first side is larger than that of the second side; along a third direction, one first side is provided with a cooling plate, and the other first side is provided with another cooling plate; wherein the first direction, the second direction and the third direction are perpendicular to each other, and the third direction is parallel to the arrangement direction of the first box body and the second box body.

[0006] Among them, the battery cell further comprises a first end face and a second end face arranged along the second direction, and in the same battery cell group, the first end face of the battery cell is oppositely arranged with the first end face of the adjacent battery cell to form a first gap space and / or the second end face of the battery cell is oppositely arranged with the second end face of the other adjacent battery cell to form a second gap space.

[0007] Among them, the first end face of the battery cell is provided with a pressure relief valve, and the pressure relief valve is communicated with the first gap space.

[0008] Among them, the battery pack further comprises an insulation protection, and the insulation protection covers the first end face.

[0009] Among them, the battery pack further comprises a high-voltage connecting piece, and the high-voltage connecting piece is located in the second gap space; along the first direction, the adjacent two battery cells are connected through the high-voltage connecting piece.

[0010] Among them, along the first direction, the opposite sides of the second end face are both provided with a pole, and the poles of the adjacent two battery cells and the poles of the adjacent battery cells are connected through the high-voltage connecting piece.

[0011] Along the second direction, the second housing includes two sidewalls arranged opposite each other, and a second gap space is formed between the second end face of the battery cell near the sidewall and the sidewall.

[0012] Along the third direction, several battery cell modules and several cooling plates are stacked in sequence.

[0013] Along the third direction, the cooling plate near the first housing is integrated with the first housing, and the cooling plate near the second housing is integrated with the second housing.

[0014] This application also includes a second technical solution, providing a vehicle including the aforementioned battery pack.

[0015] The advantages of this application are as follows: Unlike existing technologies, the battery pack provided in this application includes a housing assembly, a cell module, and at least two cooling plates. The housing assembly includes a first housing and a second housing. The second housing includes an accommodating space with an opening, and the first housing covers the opening. The cell module is disposed within the accommodating space and includes a plurality of spaced-apart cells. These cells are arranged along a first direction to form a plurality of cell groups. Each cell group consists of a plurality of cells spaced along a second direction. Each cell includes two opposing first sides and two opposing second sides, with the area of ​​the first side being larger than that of the second side. Along a third direction, one first side has a cooling plate, and the other first side has another cooling plate. This application increases the cooling area and shortens the heat dissipation path by attaching the cooling plates to the large-area first sides, thereby improving cooling efficiency. Furthermore, each cell module only has two cooling plates, reducing the number of cooling plates and processing costs. It should be noted that the first direction, the second direction, and the third direction are perpendicular to each other, and the third direction is parallel to the arrangement direction of the first and second housings. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0017] Figure 1 This is a schematic diagram of the structure of a battery pack according to an embodiment of the present application. The battery pack includes a cell module, and the cell module includes a plurality of cells.

[0018] Figure 2 yes Figure 1 A schematic diagram of the structure of a Zhongdian cell module according to an embodiment;

[0019] Figure 3 yes Figure 1 A schematic diagram of the structure of one embodiment of a CEC (China Electronics Technology Group Corporation);

[0020] Figure 4 yes Figure 3 A magnified structural diagram of part A in the middle.

[0021] Reference numerals: 1. Housing assembly; 11. First housing; 12. Second housing; 121. Side wall; 13. Accommodation space; 2. Cell module; 21. Cell assembly; 211. Cell; 2111. First side; 2112. Second side; 2113. First end face; 2114. Second end face; 22. First gap space; 23. Second gap space; 24. Pressure relief valve; 25. Insulation protection; 26. Terminal post; 3. Cooling plate; 4. High voltage connector; 100. Battery pack. Detailed Implementation

[0022] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, it should be noted that, for ease of description, only the parts relevant to this application are shown in the accompanying drawings, not the entire structure. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0023] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0024] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0025] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0026] Please refer to the reference. Figures 1 to 3 , Figure 1 This is a schematic diagram of the structure of an embodiment of the battery pack of this application. Figure 2 yes Figure 1 A schematic diagram of the structure of a Zhongdian cell module according to an embodiment. Figure 3 yes Figure 1 A schematic diagram of the structure of an embodiment of a battery cell. In one aspect of this application, a battery pack 100 is provided, comprising a housing assembly 1, a cell module 2, and at least two cooling plates 3. The housing assembly 1 includes a first housing 11 and a second housing 12. The second housing 12 includes an accommodating space 13 with an opening, and the first housing 11 covers the opening. The cell module 2 is disposed within the accommodating space 13 and includes a plurality of spaced-apart cells 211. The plurality of cells 211 are arranged along a first direction D1 to form a plurality of cell groups 21, and each cell group 21 is composed of a plurality of cells 211 spaced along a second direction D2. Each cell 211 includes two opposing first side surfaces 2111 and two opposing second side surfaces 2112, the area of ​​the first side surface 2111 being larger than the area of ​​the second side surface 2112. Along a third direction D3, one first side surface 2111 is provided with a cooling plate 3, and the other first side surface 2111 is provided with another cooling plate 3. This application increases the cooling area and shortens the heat dissipation path by attaching the cooling plate 3 to the large-area first side 2111, thereby improving cooling efficiency. Furthermore, each battery cell module 2 only requires two cooling plates 3, reducing the number of cooling plates 3 and processing costs. It should be noted that the first direction D1, the second direction D2, and the third direction D3 are perpendicular to each other, and the third direction D3 is parallel to the arrangement direction of the first housing 11 and the second housing 12.

[0027] Specifically, such as Figure 2 As shown, the shape of the battery cell 211 can be simplified to a cuboid structure, including two first side surfaces 2111, two second side surfaces 2112, and two end surfaces. The area of ​​the first side surface 2111 is larger than the area of ​​the second side surface 2112 and the area of ​​the end surfaces. Figure 1As shown in this embodiment, the battery cell 211 is arranged horizontally, and the entire battery cell module 2 is arranged horizontally as a single layer. That is, when the battery cell 211 is located inside the second housing 12, the first side 2111 is arranged along the third direction D3. The horizontal arrangement increases the contact area between the battery cell 211 and the cooling plate 3, thereby increasing the cooling area and improving cooling efficiency. Moreover, the horizontal arrangement can also reduce the size of the battery cell 211 in the third direction D3, shorten the distance between the two cooling plates 3, thereby shortening the heat dissipation path and improving heat conduction efficiency. Furthermore, since a battery cell module 2 only needs two cooling plates 3 to achieve heat dissipation performance, a single cooling plate 3 can cover the entire first side 2111 of the battery cell module 2 without needing to be split, thus reducing the number of cooling plates 3 and the processing cost.

[0028] Furthermore, along direction D3, several battery cell modules 2 and several cooling plates 3 are stacked sequentially, such that each battery cell module 2 is located between two cooling plates 3, achieving double-sided cooling of the battery cell module 2, thereby supporting high-rate charging and discharging requirements. In a specific embodiment, the number of battery cell modules 2 can be n, and the corresponding number of cooling plates 3 is n+1.

[0029] Furthermore, in some embodiments, along the third direction D3, the top cooling plate 3 can be integrated with the first housing 11, and the bottom cooling plate 3 can be integrated with the second housing 12, thereby simplifying the structure, improving assembly efficiency, and reducing costs. Of course, the cooling plate 3 and the first housing 11 or the second housing 12 can also be designed separately.

[0030] In one embodiment of this application, please refer to... Figure 2 and Figure 3 The two end faces can be a first end face 2113 and a second end face 2114 spaced apart along the second direction D2. In the same cell group 21, the first end face 2113 of cell 211 is opposite to the first end face 2113 of the adjacent cell 211 and spaced apart to form a first gap space 22 and / or the second end face 2114 of cell 211 is opposite to the second end face 2114 of another adjacent cell 211 and spaced apart to form a second gap space 23.

[0031] Specifically, in the same cell group 21, the first end face 2113 of the first cell 211 arranged along the second direction D2 is opposite to and spaced apart from the first end face 2113 of the second cell 211, forming a first gap space 22. The second end face 2114 of the second cell 211 is opposite to and spaced apart from the second end face 2114 of the third cell 211, forming a second gap space 23. The first end face 2113 of the third cell 211 is opposite to and spaced apart from the first end face 2113 of the fourth cell 211, and so on, until the first end face 2113 of the penultimate cell 211 is opposite to and spaced apart from the first end face 2113 of the penultimate cell 211. In other words, in the same cell group 21, along the second direction D2, the first gap space 22 and the second gap space 23 are arranged alternately, so that the first gap space 22 and the second gap space 23 are set independently of each other. In one specific embodiment, the first gap space 22 can be an exhaust channel for discharging gas. Since the two battery cells 211 share one exhaust channel, the overall system exhaust gap is reduced, saving space and increasing energy density. Furthermore, the independent arrangement of multiple exhaust channels increases the exhaust rate and improves performance. The second gap space 23 can be a high-voltage connection space for housing the high-voltage connector 4. In another specific embodiment, the first gap space 22 can also be a high-voltage connection space, and the second gap space 23 can also be an exhaust channel. In yet another specific embodiment, the first gap space 22 and the second gap space 23 can also be used for other beneficial purposes. In other specific embodiments, the exhaust channel can also include the gap between the battery cell 211 and the upper and lower cooling plates 3, which will not be elaborated here.

[0032] Further, in one specific embodiment, along the second direction D2, the second housing 12 includes two opposing sidewalls 121. A second gap space 23 is formed between the second end face 2114 of the battery cell 211 near the sidewall 121 and the sidewall 121. That is, in the second direction D2, the two battery cells 211 at the beginning and end positions respectively form the second gap space 23 with the sidewall 121 through their second end faces 2114 to accommodate components such as the high-voltage connector 4. In another specific embodiment, in the second direction D2, the two battery cells 211 at the beginning and end positions can also form a first gap space 22 with the sidewall 121 through their first end faces 2113 to discharge gas and metal particles. In one embodiment of this application, the first end face 2113 of the battery cell 211 is provided with a pressure relief valve 24, which connects to the first gap space 22, allowing the first gap space 22 to be used for pressure relief and exhaust.

[0033] Specifically, the first gap space 22 can serve as a venting channel. In the event of thermal runaway of the battery cell 211, metal particles and powder ejected through the pressure relief valve 24 can also be discharged through this venting channel, thereby improving safety. In one specific embodiment, since each battery cell 211 can have the same structure, the pressure relief valve 24 of each battery cell 21 is positioned opposite and spaced apart from the pressure relief valves 24 of adjacent battery cells within the same battery cell group 21. In another specific embodiment, the pressure relief valves 24 of the battery cells 211 within the same battery cell group 21 can also be staggered from the pressure relief valves 24 of adjacent battery cells 211.

[0034] Furthermore, such as Figure 3 and Figure 4 As shown, Figure 4 yes Figure 3 A partially enlarged structural schematic diagram at point A. The battery pack 100 also includes an insulating shield 25, which covers the first end face 2113 and is used to block the particulate ejection device to improve or prevent the gas and particulates ejected during thermal runaway of the cell 211 from entering the opposite cell 211 and causing runaway.

[0035] In one embodiment of this application, combined with Figure 1 and Figure 2 The battery pack 100 also includes a high-voltage connector 4, which is located within the second gap space 23. Along the first direction D1, two adjacent cells 211 are connected by the high-voltage connector 4. That is, along the first direction D1, two adjacent groups of cells 21 are also connected by the high-voltage connector 4 to form a cell module 2.

[0036] Specifically, the second gap space 23 can be a high-voltage connection space for accommodating the high-voltage connector 4. The high-voltage connector 4 can also block the connection between the second gap space 23 and the first gap space 22, thereby improving the airtightness of the second gap space 23.

[0037] Furthermore, along the first direction D1, terminals 26 are provided on both opposite sides of the second end face 2114. The terminals 26 of the battery cell 211 are connected to the terminals 26 of another adjacent battery cell 211 through a high-voltage connector 4. That is, along the first direction D1, corresponding batteries 211 in several battery cell groups 21 are connected to adjacent second end faces 2114 through the terminals 26 at both ends to form a battery cell module 2. The high-voltage connector 4 also serves to protect the terminals 26.

[0038] In some embodiments, a plurality of cells 211 in the cell module 2 are arranged in a matrix to form a plurality of cell groups 21 arranged along the first direction D1. These plurality of cells 211 form a plurality of first cell groups (not shown) arranged along the second direction D2. A plurality of cells 211 in each first cell group are connected in series, in parallel or in a mixed manner through high-voltage connectors 4. A plurality of first cell groups can be connected in series, in parallel or in a mixed manner through other high-voltage connectors (not shown) to form the cell module 2.

[0039] In the above embodiment, since the first gap space 22 and the second gap space 23 are respectively on both sides of the cell 211, the metal particles ejected when the cell 211 thermally runs away can reduce or avoid contact with the terminal post 26 and the high-voltage connector 4 of the cell 211, thereby avoiding high-voltage short circuit and improving the safety of the battery pack 100.

[0040] In one specific embodiment, the battery pack 100 uses a horizontal arrangement of the cell modules 2 and a cooling plate 3 to cool the two first sides 2111, so that the number of layers of the cell modules 2 stacked on the third direction D3 is about 2-3 layers, thereby controlling the stacking tolerance and the allowance for expansion space, and reducing manufacturing costs. In another specific embodiment, the number of layers of the cell modules 2 can also be set according to the actual situation.

[0041] In another aspect, this application also provides a vehicle that includes the battery pack 100 described above. Specifically, since the vehicle includes the battery pack 100 described in the above embodiments, it also has the beneficial effects of the battery pack 100 described above, which will not be repeated here.

[0042] It should be noted that the terms "horizontal" and "vertical" do not imply that the components must be absolutely horizontal or vertical, but rather that they can be slightly tilted. Similarly, the terms "parallel" and "perpendicular" do not imply that the components are absolutely parallel or perpendicular, but rather that they can have a certain angular deviation. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted. In addition, the orientations or positional relationships indicated by terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" are based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships that are commonly used when the product of this application is in use. They are only for the purpose of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0043] It is understood that the term "multiple" in this document means at least two, such as two, three, etc., unless otherwise specified. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices. The term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0044] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A battery pack, characterized in that, include: The housing assembly (1) includes a first housing (11) and a second housing (12), the second housing (12) including an accommodating space (13) having an opening, the first housing (11) covering the opening; A battery cell module (2) is disposed in the accommodating space (13). The battery cell module (2) includes a plurality of spaced-apart battery cells (211). The plurality of battery cells (211) are arranged along a first direction to form a plurality of battery cell groups (21). The battery cell group (21) is composed of a plurality of battery cells (211) spaced along a second direction. The battery cell (211) includes two opposing first side surfaces (2111) and two opposing second side surfaces (2112). The area of ​​the first side surface (2111) is larger than the area of ​​the second side surface (2112). At least two cooling plates (3) are provided along a third direction, with one cooling plate (3) provided on one first side (2111) and another cooling plate (3) provided on the other first side (2111); The first direction, the second direction, and the third direction are perpendicular to each other, and the third direction is parallel to the arrangement direction of the first box (11) and the second box (12).

2. The battery pack according to claim 1, characterized in that, The battery cell (211) further includes a first end face (2113) and a second end face (2114) spaced apart along the second direction. In the same battery cell group (21), the first end face (2113) of the battery cell (211) is opposite to the first end face (2113) of the adjacent battery cell (211) and spaced apart to form a first gap space (22) and / or the second end face (2114) of the battery cell (211) is opposite to the second end face (2114) of another adjacent battery cell (211) and spaced apart to form a second gap space (23).

3. The battery pack according to claim 2, characterized in that, The first end face (2113) of the battery cell (211) is provided with a pressure relief valve (24), which is connected to the first gap space (22).

4. The battery pack according to claim 3, characterized in that, The battery pack also includes an insulating shield (25) that covers the first end face (2113).

5. The battery pack according to claim 2, characterized in that, The battery pack also includes a high-voltage connector (4), which is located within the second gap space (23); Along the first direction, two adjacent cells (211) are connected by the high-voltage connector (4).

6. The battery pack according to claim 5, characterized in that, Along the first direction, pole posts (26) are provided on both sides of the second end face (2114), and the pole posts (26) of two adjacent cells (211) are connected by the high voltage connector (4).

7. The battery pack according to claim 2, characterized in that, Along the second direction, the second housing (12) includes two opposing sidewalls (121), and the second gap space (23) is formed between the second end face (2114) of the battery cell (211) near the sidewall (121) and the sidewall (121).

8. The battery pack according to claim 1, characterized in that, Along the third direction, a plurality of battery cell modules (2) and a plurality of cooling plates (3) are stacked in sequence.

9. The battery pack according to claim 1, characterized in that, Along the third direction, the cooling plate (3) near the first housing (11) is integrated with the first housing (11), and the cooling plate (3) near the second housing (12) is integrated with the second housing (12).

10. A vehicle, characterized in that, include: The battery pack according to any one of claims 1-9.

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