Battery assembly and battery pack

Abstract

The utility model belongs to the technical field of power batteries, and particularly relates to a battery assembly and a battery pack. Comprising a plurality of rows of battery cell units, and each row of battery cell units is provided with a first side and a second side which are distributed along the arrangement direction of the plurality of rows of battery cell units; the multiple cooling plates are distributed in the arrangement direction of the multiple rows of battery cell units, each cooling plate corresponds to one row of battery cell units, a cooling flow channel is formed in each cooling plate, a liquid inlet and a liquid outlet are formed in the ends, located at the same ends of the battery cell units, of the first plate body and the second plate body respectively, one end of each cooling flow channel is communicated with the liquid inlet, and the other end of each cooling flow channel is communicated with the liquid outlet. And the other end of the cooling flow channel extends in one direction, sequentially flows through the first plate body and the second plate body and is communicated with the liquid outlet. The cooling channel is arranged in a one-way extending manner so as to prevent a cooling medium from flowing back and forth on the first side and the second side of the battery cell unit, cooling is uniform, the heat dissipation performance of the battery assembly and the battery pack is ensured, the structure is simple, the layout is compact, and the energy density of the battery assembly and the battery pack is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of power batteries, and in particular relates to a battery assembly and a battery pack. Background Art

[0002] Because the battery cells in a battery pack emit heat during use, the internal temperature of the battery pack needs to be regulated to maintain it within a certain temperature range to ensure the safety of the battery pack. Currently, this temperature regulation is generally achieved by placing cooling plates on one or both sides of the battery cells. However, the cooling plates located on the same side of the battery cells generally have cooling channels inside for the reciprocating flow of the cooling medium. Although this extends the flow path of the cooling medium within the cooling plates, it has complex structures and poor cooling effects, which affects the heat dissipation performance of the battery pack. Utility Model Content

[0003] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a battery assembly and a battery pack to solve the problems of complex structure and poor cooling effect of the cooling plate in the prior art, so as to improve the heat dissipation performance of the battery assembly and the battery pack.

[0004] To achieve the above-mentioned and other related purposes, the present invention provides a battery assembly, comprising:

[0005] Multiple rows of battery cell units, each row of battery cell units having a first side and a second side distributed along an arrangement direction of the multiple rows of battery cell units;

[0006] a plurality of cooling plates, the plurality of cooling plates being distributed along the arrangement direction of the plurality of rows of battery cell units, each cooling plate corresponding to a row of battery cell units, a cooling channel being provided in the cooling plate, the cooling plate comprising a first plate body and a second plate body connected to each other, at least some of the battery cell units being sandwiched between the first plate body and the second plate body of the corresponding cooling plate, and the first plate body and the second plate body being respectively located on the first side and the second side of the corresponding row of battery cell units;

[0007] Particularly, the ends of the first plate and the second plate located at the same end of the battery cell unit are respectively provided with a liquid inlet and a liquid outlet, one end of the cooling channel is connected to the liquid inlet, and the other end of the cooling channel extends unidirectionally, flows through the first plate and the second plate in sequence, and is connected to the liquid outlet.

[0008] Optionally, the cooling plate further includes a connector, and an end of the first plate body away from the liquid inlet is connected to an end of the second plate body away from the liquid outlet through the connector, and the first plate body, the connector and the second plate body are connected to form a U-shaped structure.

[0009] Optionally, the cooling channel includes a first straight section located in the first plate body, a second straight section located in the second plate body, and a connecting section located in the connecting body. The first straight section and the second straight section are connected through the connecting section, and the first straight section, the connecting section and the second straight section are connected to form a U-shaped structure.

[0010] Optionally, a plurality of cooling channels are provided in the cooling plate, and the plurality of cooling channels are connected in parallel and distributed along the height direction of the cooling plate.

[0011] Optionally, some of the battery core units are located between two adjacent cooling plates, and a row of the battery core units is sandwiched between two adjacent cooling plates.

[0012] Optionally, the end of the first plate body close to the liquid inlet is connected to a liquid inlet collecting piece, and the liquid inlet collecting piece is provided with a liquid inlet joint connected to the liquid inlet; the end of the second plate body close to the liquid outlet is connected to a liquid outlet collecting piece, and the liquid outlet collecting piece is provided with a liquid outlet joint connected to the liquid outlet; the liquid outlet joint and the liquid inlet joint are staggered in the height direction of the cooling plate.

[0013] Optionally, in the height direction of the cooling plate, the multiple liquid inlet joints correspondingly connected to the first plate bodies of the multiple cooling plates are located at the same height and are connected to the same liquid inlet pipe.

[0014] Optionally, in the height direction of the cooling plate, the plurality of liquid outlet joints correspondingly connected to the second plate bodies of the plurality of cooling plates are located at the same height and are connected to the same liquid outlet pipe.

[0015] Optionally, the first side and the second side of the battery cell unit are the sides with the largest surface area of ​​the battery cell unit, each row of the battery cell units includes multiple battery cells stacked on their end faces, the side with the smallest surface area of ​​the battery cell is the end face, and the side with the largest surface area of ​​the battery cell corresponds to the side with the largest surface area of ​​the battery cell unit, and the battery cell includes a square shell battery cell.

[0016] To achieve the above objectives and other related objectives, the present application also provides a battery pack, including the battery assembly as described above.

[0017] As described above, the battery assembly and battery pack of the present invention have at least the following beneficial effects: the cooling channel in the cooling plate is arranged on the first plate body and the second plate body, so that the cooling medium in the cooling channel can act on the first side and the second side of the battery cell unit, and the cooling effect is good; based on this, the cooling channel extends in one direction, so that the cooling medium will not flow back and forth on the first side and the second side of the battery cell unit, and the cooling is uniform, which is conducive to further improving the cooling effect and ensuring the heat dissipation performance of the battery assembly and battery pack; in addition, the liquid inlet and the liquid outlet are respectively arranged on the first plate body and the second plate body, which avoids the reciprocating flow of the cooling medium while allowing the liquid inlet and the liquid outlet to be located at the same end of the battery cell unit, with a compact layout, which is conducive to simplifying the structure and reducing the occupied space, thereby helping to improve the energy density of the battery assembly and battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a partial structural diagram of an embodiment of a battery assembly of the present utility model;

[0019] Figure 2 for Figure 1 A top view of the battery assembly;

[0020] Figure 3 for Figure 1 A side view of the battery assembly;

[0021] Figure 4 for Figure 1 Schematic diagram of the structure of the battery assembly after removing the liquid inlet and outlet pipes;

[0022] Figure 5 for Figure 4 Schematic diagram of the structure of the cooling plate;

[0023] Figure 6 for Figure 5 Top view of the cooling plate;

[0024] Figure 7 for Figure 6 Cross-sectional view at AA in the middle;

[0025] Figure 8 for Figure 7 A partial enlarged schematic diagram;

[0026] Figure 9 for Figure 5 Main view of the middle cooling plate;

[0027] Figure 10 for Figure 5 Side view of the cooling plate.

[0028] Part Number Description

[0029] Battery cell unit 1, battery cell 11, cooling plate 2, cooling channel 21, first plate body 22, second plate body 23, connector 24, liquid inlet 25, liquid outlet 26, liquid inlet collecting piece 31, liquid inlet joint 32, liquid outlet collecting piece 33, liquid outlet joint 34, collecting cavity 35, liquid inlet pipe 41, liquid outlet pipe 42. DETAILED DESCRIPTION

[0030] The following describes the implementation of the present invention through specific embodiments. People familiar with this technology can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0031] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for understanding and reading by those familiar with this technology, and are not used to limit the conditions for implementation of the present invention. Therefore, they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed in the present invention without affecting the efficacy and purpose of the present invention. At the same time, terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present invention. Changes or adjustments in their relative relationships should also be considered as the scope of implementation of the present invention without substantially changing the technical content.

[0032] See also Figures 1 to 3 、 Figures 6 to 8 and Figure 10In some optional embodiments, the present application provides a battery assembly comprising multiple rows of battery cell units 1 and multiple cooling plates 2. In addition to the aforementioned components, the battery assembly may further include a liquid inlet manifold 31 and / or a liquid outlet manifold 33 and / or a liquid inlet pipe 41 and / or a liquid outlet pipe 42. Each row of battery cell units 1 has a first side and a second side distributed along the arrangement direction of the multiple rows of battery cell units 1. The first side and the second side of the battery cell unit 1 may be opposite sides of the battery cell unit 1 along its thickness direction. A plurality of cooling plates 2 are distributed along the arrangement direction of the plurality of rows of battery cell units 1, each cooling plate 2 corresponds to a row of battery cell units 1, a cooling channel 21 is provided in the cooling plate 2, and the cooling channel 21 can be used for the circulation of the cooling medium, and the cooling plate 2 includes a first plate body 22 and a second plate body 23 connected to each other, at least part of the battery cell unit 1 is sandwiched between the first plate body 22 and the second plate body 23 of the cooling plate 2 corresponding thereto, and the first plate body 22 and the second plate body 23 are respectively located on the first side and the second side of the corresponding row of battery cell units 1, or in other words, the first plate body 22 and the second plate body 23 are distributed and connected along the thickness direction of the battery cell unit 1, and the first plate body 22 is located at the battery cell. On the first side of the unit 1, the second plate 23 is located on the second side of the battery cell unit 1; wherein, the ends of the first plate 22 and the second plate 23 located at the same end of the battery cell unit 1 are respectively provided with a liquid inlet 25 and a liquid outlet 26, one end of the cooling channel 21 is connected with the liquid inlet 25, and the other end of the cooling channel 21 extends unidirectionally and flows through the first plate 22 and the second plate 23 in sequence and is connected with the liquid outlet 26, that is, the cooling medium enters the cooling channel 21 from the liquid inlet 25, and flows through the first plate 22 and the second plate 23 in sequence and then flows out of the cooling channel 21 from the liquid outlet 26, and does not flow back and forth inside the first plate 22 and the second plate 23.

[0033] Optionally, the first side and the second side of the battery cell unit 1 are the sides with the largest surface area of ​​the battery cell unit 1. Each row of battery cell units 1 includes a plurality of battery cells 11 stacked with end faces, and the side with the smallest surface area of ​​the battery cell 11 is the end face, that is, a plurality of battery cells 11 are stacked and arranged in a row to form a battery cell unit 1, and the battery cell 11 has two end faces, which are two side faces distributed along the length direction of the battery cell 11 and opposite to each other; the side with the largest surface area of ​​the battery cell 11 corresponds to the side with the largest surface area of ​​the battery cell unit 1, or in other words, the battery cell 11 has a first large face and a second large face, which are two side faces distributed along the thickness direction of the battery cell 11 and have the largest surface area, the first large face and the second large face are located on the same side as the first side of the battery cell unit 1, and the second large face of the battery cell 11 is located on the same side as the second side of the battery cell unit 1, wherein the battery cell 11 includes a square shell battery cell.

[0034] Optionally, some of the battery cells 1 are located between two adjacent cooling plates 2, and a row of battery cells is sandwiched between the two adjacent cooling plates 2. In other words, two adjacent rows of battery cells 1 are separated by a first plate 22 or a second plate 23. The first side of the battery cell 1 located between the two cooling plates 2 can be in contact with the first plate 22 of one of the adjacent cooling plates 2 for cooling, and the second side of the battery cell 1 can be in contact with the second plate 23 of the other adjacent cooling plate 2 for cooling. This structural layout allows one cooling plate 2 to be in contact with two rows of battery cells 1. The two adjacent cooling plates 2 can cooperate to fully cool three rows of battery cells 1, which can reduce the number of cooling plates 2, simplify the structure, and reduce occupied space. In the present application, the thickness direction of the battery cell 11, the thickness direction of the battery cell unit 1 and the arrangement direction of multiple rows of battery cell units 1 are the same, that is, the X direction in the accompanying drawings; the length direction of the battery cell 11, the length direction of the battery cell unit 1 and the arrangement direction of multiple battery cells 11 in the same row of battery cell units 1 are the same, that is, the Y direction in the accompanying drawings; the height direction of the battery cell 11, the height direction of the battery cell unit 1 and the height direction of the cooling plate 2 are the same, that is, the Z direction in the accompanying drawings.

[0035] Optionally, the cooling plate 2 further includes a connector 24, and the end of the first plate 22 away from the liquid inlet 25 is connected to the end of the second plate 23 away from the liquid outlet 26 via the connector 24. The first plate 22, the connector 24, and the second plate 23 are connected to form a U-shaped structure. In other words, the cooling plate 2 can be a U-shaped structure with a simple structure and assembly direction, and can cool both sides of the battery cell unit 1, thereby achieving a good cooling effect. In the longitudinal direction of the battery cell unit 1, the battery cell unit 1 has a first end and a second end, the liquid inlet 25 on the first plate 22 and the liquid outlet 26 on the second plate 23 are close to the first end of the battery cell unit 1, and the connector 24 is close to the second end of the battery cell unit 1.

[0036] Optionally, the cooling channel 21 includes a first straight section located in the first plate body 22, a second straight section located in the second plate body 23, and a connecting section located in the connecting body 24. The first straight section and the second straight section are connected through the connecting section, and the first straight section, the connecting section and the second straight section are connected to form a U-shaped structure. That is, the cooling channel 21 can be a U-shaped structure. This structural layout allows the cooling medium acting on the same side of the battery cell unit 1 to flow unidirectionally in the cooling plate 2 instead of flowing back and forth, and the cooling is more uniform, which is conducive to improving the cooling effect.

[0037] Optionally, a plurality of cooling channels 21 are provided in the cooling plate 2, and the plurality of cooling channels 21 are connected in parallel and distributed along the height direction of the cooling plate 2, which is beneficial for accommodating more cooling medium inside the cooling plate 2 and improving the heat dissipation performance of the cooling plate 2. Moreover, the plurality of cooling channels 21 are independent of each other, avoiding the reciprocating flow of the cooling medium in the cooling channels 21, which is beneficial for improving the cooling effect of the cooling plate 2.

[0038] In the battery assembly of the above embodiment, the cooling plate 2 can act on the first side and the second side of the battery cell unit 1 at the same time, which is beneficial to improving the cooling effect; in addition, the cooling flow channel 21 in the cooling plate 2 extends in one direction, so that the cooling medium can act on the first side and the second side of the battery cell unit 1 in turn, and the cooling medium will not flow back and forth in the cooling plate 2. The cooling temperature is more uniform, which is beneficial to improving the cooling effect of the battery assembly, thereby improving the heat dissipation performance of the battery assembly.

[0039] See also Figure 1 、 Figure 3 、 Figures 4 to 6 、 Figure 9 and Figure 10 In some optional embodiments, one end of the first plate body 22 near the liquid inlet 25 is connected to a liquid inlet collecting member 31, and the liquid inlet collecting member 31 is provided with a liquid inlet joint 32 connected to the liquid inlet 25; one end of the second plate body 23 near the liquid outlet 26 is connected to a liquid outlet collecting member 33, and the liquid outlet collecting member 33 is provided with a liquid outlet joint 34 connected to the liquid outlet 26; the liquid outlet joint 34 and the liquid inlet joint 32 are staggered in the height direction of the cooling plate 2.

[0040] Optionally, in the height direction of the cooling plate 2, the multiple liquid inlet connectors 32 corresponding to the first plate bodies 22 of the multiple cooling plates 2 are located at the same height and are connected to the same liquid inlet pipe 41; or, the multiple liquid inlet connectors 32 connected to different cooling plates 2 are located at the same height and are connected to the same liquid inlet pipe 41. The liquid inlet connector 32 and the liquid inlet pipe 41 can be plugged in and matched, which is not only simple, convenient and fast to assemble, but also has a compact layout and can share the same liquid inlet pipe 41, which is conducive to reducing the number of parts, thereby reducing occupied space and reducing weight.

[0041] Optionally, in the height direction of the cooling plate 2, the multiple liquid outlet connectors 34 corresponding to the second plate bodies 23 of the multiple cooling plates 2 are located at the same height and are connected to the same liquid outlet pipe 42; or, the multiple liquid outlet connectors 34 connected to different cooling plates 2 are located at the same height and are connected to the same liquid outlet pipe 42. The liquid outlet connectors 34 and the liquid outlet pipe 42 can be plugged in and matched, which is not only simple, convenient and fast to assemble, but also has a compact layout and can share the same liquid outlet pipe 42, which is beneficial to reducing the number of parts, thereby reducing occupied space and reducing weight.

[0042] Optionally, a manifold 35 is provided inside the liquid inlet manifold 31, which communicates with the liquid inlet 25 of the cooling channel 21; and a manifold 35 is provided inside the liquid outlet manifold 33, which communicates with the liquid outlet 26 of the cooling channel 21. The cooling medium can be collected in the manifold 35, which facilitates the smooth flow of the cooling medium.

[0043] In the battery assembly of the above embodiment, the liquid inlet collecting piece 31 and the liquid outlet collecting piece 33 are integrated on the cooling plate 2, which not only reduces the connection points and reduces the risk of leakage, but also facilitates quick connection with the liquid inlet pipe 41 and the liquid outlet pipe 42, and the assembly is simple and efficient; in addition, the liquid inlet collecting piece 31 and the liquid outlet collecting piece 33 are staggered in the height direction of the liquid cooling plate, which facilitates the sharing of the liquid inlet pipe 41 and the liquid outlet pipe 42, which is conducive to simplifying the piping structure, reducing the number of components, reducing the occupied space and reducing costs.

[0044] See also Figure 1 and Figure 4 In some optional embodiments, the present application also provides a battery pack, including a battery assembly as in any of the above embodiments, which has at least the beneficial effects of the above battery assembly, such as good cooling effect, small space occupation, good heat dissipation performance, and high energy density.

[0045] In the battery assembly and battery pack of the present invention, a unidirectionally extending cooling channel 21 is provided in the cooling plate 2, so that the cooling medium will not flow back and forth between the first and second sides of the battery cell unit 1 when acting on the first and second sides of the battery cell unit 1, and the cooling is uniform, thereby ensuring the heat dissipation performance of the battery assembly and the battery pack; and the liquid inlet 25 and the liquid outlet 26 are respectively arranged on the first plate body 22 and the second plate body 23, so that the liquid inlet 25 and the liquid outlet 26 can be located at the same end of the battery cell unit 1 while avoiding the reciprocating flow of the cooling medium. The layout is compact, which is conducive to simplifying the structure and reducing the occupied space, thereby helping to improve the energy density of the battery assembly and the battery pack.

[0046] Throughout this specification, references to terms such as "this embodiment," "example," and "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0047] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed in the present invention are intended to be covered by the claims of the present invention.

Claims

1. A battery assembly, characterized in that: include: A plurality of rows of battery cell units, each row of the battery cell units having a first side and a second side distributed along an arrangement direction of the plurality of rows of the battery cell units; A plurality of cooling plates, the plurality of cooling plates are distributed along the arrangement direction of the plurality of rows of the battery cell units, each of the cooling plates corresponds to a row of the battery cell units, a cooling channel is provided in the cooling plate, the cooling plate comprises a first plate body and a second plate body connected to each other, at least part of the battery cell units are sandwiched between the first plate body and the second plate body of the corresponding cooling plate, and the first plate body and the second plate body are respectively located on the first side and the second side of the corresponding row of the battery cell units; Among them, the ends of the first plate body and the second plate body located at the same end of the battery cell unit are respectively provided with a liquid inlet and a liquid outlet, one end of the cooling channel is connected to the liquid inlet, and the other end of the cooling channel extends unidirectionally and flows through the first plate body and the second plate body in sequence and is connected to the liquid outlet.

2. The battery assembly according to claim 1, characterized in that: The cooling plate further includes a connector, and an end of the first plate body away from the liquid inlet is connected to an end of the second plate body away from the liquid outlet through the connector, and the first plate body, the connector and the second plate body are connected to form a U-shaped structure.

3. The battery assembly according to claim 2, characterized in that: The cooling channel includes a first straight section located in the first plate body, a second straight section located in the second plate body, and a connecting section located in the connecting body, the first straight section and the second straight section are connected through the connecting section, and the first straight section, the connecting section and the second straight section are connected to form a U-shaped structure.

4. The battery assembly according to claim 1, characterized in that: A plurality of cooling channels are arranged in the cooling plate, and the plurality of cooling channels are connected in parallel and distributed along the height direction of the cooling plate.

5. The battery assembly according to claim 1, characterized in that: Some of the battery cell units are located between two adjacent cooling plates, and a row of the battery cell units is sandwiched between two adjacent cooling plates.

6. The battery assembly according to claim 1, characterized in that: One end of the first plate body close to the liquid inlet is connected to a liquid inlet collecting piece, and the liquid inlet collecting piece is provided with a liquid inlet joint connected to the liquid inlet; one end of the second plate body close to the liquid outlet is connected to a liquid outlet collecting piece, and the liquid outlet collecting piece is provided with a liquid outlet joint connected to the liquid outlet; the liquid outlet joint and the liquid inlet joint are staggered in the height direction of the cooling plate.

7. The battery assembly according to claim 6, characterized in that: In the height direction of the cooling plate, the plurality of liquid inlet joints correspondingly connected to the first plate bodies of the plurality of cooling plates are located at the same height and are connected to the same liquid inlet pipe.

8. The battery assembly according to claim 6, characterized in that: In the height direction of the cooling plate, the plurality of liquid outlet joints correspondingly connected to the second plate bodies of the plurality of cooling plates are located at the same height and are connected to the same liquid outlet pipe.

9. The battery assembly according to any one of claims 1 to 8, characterized in that: The first side and the second side of the battery cell unit are the sides with the largest surface area of ​​the battery cell unit. Each row of the battery cell units includes a plurality of battery cells stacked end-on. The side with the smallest surface area of ​​the battery cell is the end face, and the side with the largest surface area of ​​the battery cell corresponds to the side with the largest surface area of ​​the battery cell unit. The battery cell includes a square shell battery cell.

10. A battery pack, characterized in that: Comprising a battery assembly as claimed in any one of claims 1 to 9.

Images