A battery pack and energy storage device

Abstract

The utility model discloses an embodiment relates to the energy storage technology field, especially discloses a kind of battery pack and energy storage equipment, including box, electric core subassembly and heat conduction sheet, box is provided with battery compartment, electric core subassembly is housed in battery compartment, heat conduction sheet is set between the inner surface of electric core subassembly and box, and heat conduction sheet is respectively attached to the inner surface of electric core subassembly and box.

Description

Technical Field

[0001] This utility model relates to the field of energy storage technology, and in particular to a battery pack and energy storage device. Background Technology

[0002] A battery pack is a system that integrates battery cells, a battery management system, and structural components to provide a stable power output for new energy vehicles and energy storage devices. With the rapid development of the energy and energy storage industries, the performance and safety design of battery packs are receiving increasing attention.

[0003] Currently, conventional battery packs typically have mounting racks inside the casing. The battery cells are packaged and secured before being installed on the mounting racks inside the casing. In this design, the battery cell modules do not directly contact the inner wall of the casing. However, the heat generated by the battery cells needs to be transferred to the casing through the air inside the casing for heat dissipation. Compared with metal casings, air has a lower thermal conductivity and poorer heat transfer effect. Usually, a special heat dissipation module is required to meet the heat dissipation requirements, which is more expensive and does not make full use of the space inside the casing. Utility Model Content

[0004] The main technical problem solved by this utility model embodiment is to provide a battery pack and energy storage device that can save the battery pack's body space and improve natural heat dissipation efficiency.

[0005] To solve the above-mentioned technical problems, the present invention adopts a technical solution as follows: a battery pack is provided, including a housing, a battery cell assembly and a heat-conducting sheet. The housing is provided with a battery compartment, the battery cell assembly is housed in the battery compartment, and the heat-conducting sheet is disposed between the battery cell assembly and the inner surface of the housing, and the heat-conducting sheet is respectively attached to the inner surface of the battery cell assembly and the housing.

[0006] Optionally, the housing includes a lower housing and a top cover. The lower housing includes a main housing and side panels. The main housing includes a bottom plate, two end plates, and a surrounding plate. The two end plates are disposed opposite to the bottom plate. The two ends of the surrounding plate are respectively fixed to one end of the two end plates. The surrounding plate is also fixed to the bottom plate. The bottom plate, the two end plates, and the surrounding plate enclose a cavity with a side opening and a top opening. The inner surface of the housing includes the surface of the surrounding plate facing the cavity. The heat-conducting sheet is disposed between the surrounding plate and the side of the battery cell assembly along a first direction. The heat-conducting sheet is respectively attached to the side of the battery cell assembly along the first direction and the surface of the surrounding plate facing the cavity. The side plate is detachably fixed to the other end of the two end plates and the bottom plate to close the side opening. The top cover is detachably fixed to the side plate and the end of the two end plates away from the bottom plate to close the top opening.

[0007] Optionally, the cell assembly has two end faces along a second direction, which is perpendicular to the first direction. The battery pack also includes two first insulating sheets, one of which is disposed between one of the end faces and one of the end plates.

[0008] Optionally, the cell assembly has a bottom surface along a third direction, and the first direction, the second direction, and the third direction are perpendicular to each other. The battery pack also includes a second insulating sheet, which is disposed between the base plate and the bottom surface of the cell assembly.

[0009] Optionally, the battery cell assembly further includes a plurality of battery cell groups arranged sequentially along a second direction. Each battery cell group includes a plurality of battery cells and a plurality of heat insulation sheets. The plurality of battery cells are arranged sequentially along a first direction. Along the first direction, a heat insulation sheet is provided between any two adjacent battery cells.

[0010] Optionally, the main housing further includes a plurality of isolation rods, which are fixed at intervals to the base plate, and any two adjacent battery cell groups are spaced apart by one isolation rod, so that any two adjacent battery cell groups have a heat dissipation gap.

[0011] Optionally, the isolation rod has several through holes on the side facing away from the base plate.

[0012] Optionally, along the first direction, one end of the bottom plate away from the surrounding plate protrudes from the two end plates. The end plate includes an end plate body and a first fold. The end plate body is fixed to the surrounding plate and the bottom plate respectively. The first fold is vertically fixed to the other end of the end plate body away from the surrounding plate. The side plate includes a side plate body and a second fold. The second fold is vertically fixed to the bottom end of the side plate body. The second fold is attached to and detachably fixed to the portion of the bottom plate protruding from the two end plates along the first direction. The side plate body is attached to and fixed to the first fold of the two end plates.

[0013] Optionally, the end plate further includes a third fold, which is vertically fixed to the top of the end plate body away from the bottom plate. The side plate further includes a fourth fold, which is vertically fixed to the top of the side plate body. The top of the enclosure away from the bottom plate is provided with a fifth fold. The top cover is attached to and detachably fixed to the third, fourth, and fifth folds.

[0014] To solve the above-mentioned technical problems, another technical solution adopted by this utility model is to provide an energy storage device, including the above-mentioned battery pack.

[0015] The beneficial effects of this utility model embodiment are as follows: Unlike existing technologies, this utility model embodiment provides a battery pack including a housing, a battery cell assembly, and a heat-conducting sheet. The housing has a battery compartment, and the battery cell assembly is housed within the battery compartment. The heat-conducting sheet is disposed between the battery cell assembly and the inner surface of the housing, and is attached to both the battery cell assembly and the inner surface of the housing. The battery cell assembly directly contacts the inner surface of the housing through the heat-conducting sheet, reducing the volume of the battery pack. When the battery pack is operating, the heat generated by the battery cell assembly can be directly and quickly transferred to the housing for heat dissipation through the heat-conducting sheet, without the need for an air medium, resulting in high heat dissipation efficiency. This eliminates the need for an additional heat dissipation module, saving production costs. Attached Figure Description

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

[0017] Figure 1 This is an overall structural diagram of the battery pack provided in this embodiment of the utility model; Figure 2 This is an exploded view of the battery pack provided in an embodiment of this utility model; Figure 3 This is an exploded view of the box provided in an embodiment of this utility model; Figure 4 This is a partial exploded view of the battery cell assembly provided in this embodiment of the present invention; Figure 5 This is a structural diagram of the battery cell assembly provided in this embodiment of the utility model; Figure 6 This is a structural diagram of the main housing provided in this embodiment of the utility model; Figure 7 This is a structural diagram of the side plate provided in an embodiment of the present utility model; Figure 8 yes Figure 6 A magnified view of part A in the middle.

[0018] Explanation of reference numerals in the attached figures: 100 battery pack; 1. Box body, 11. Lower box body, 111. Main box body, 1111. Bottom plate, 1112. End plate, 1112a. End plate body, 1112b. First fold, 1112c. Third fold, 1113. Enclosure, 1113a. Fifth fold, 1114. Isolation rod, 1114a. Through hole, 112. Side plate, 1121. Side plate body, 1122. Second fold, 1123. Fourth fold, 12. Top cover; 2. Battery cell assembly, 21. Battery cell group, 211. Battery cell, 212. Heat insulation sheet, 22. End face, 23. Bottom face; 3. Heat-conducting sheet; 4. First insulating sheet; 5. Second insulating sheet; X is the first direction, Y is the second direction, and Z is the third direction. Detailed Implementation

[0019] To facilitate understanding of this utility model, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as being "connected" to another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this specification are for illustrative purposes only.

[0020] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0021] This utility model provides an embodiment of a battery pack 100, which can improve heat dissipation efficiency, save pack space, and reduce production costs.

[0022] To facilitate the reader's understanding of the concept of this utility model embodiment, the specific structure of the battery pack 100 is described below: Please see Figure 1 and Figure 2 The battery pack 100 includes a housing 1, a cell assembly 2, and a heat-conducting plate 3. The housing 1 is provided with a battery compartment 10, and the cell assembly 2 is housed in the battery compartment 10. The heat-conducting plate 3 is disposed between the cell assembly 2 and the housing 1. One side of the heat-conducting plate 3 is attached to the inner surface of the housing 1, and the other side of the heat-conducting plate 3 is attached to the surface of the cell assembly 2. The heat-conducting plate 3 can quickly transfer the heat generated by the cell assembly 2 during operation to the housing 1 for heat dissipation to the outside.

[0023] For the aforementioned housing 1, please refer to Figure 3The housing 1 includes a lower housing 11 and an upper cover 12. The upper cover 12 is detachably fixed to the lower housing 11. The lower housing 11 includes a main housing 111 and a side panel 112. The side panel 112 is detachably fixed to the main housing 111. The main body 111 includes a bottom plate 1111, a surrounding plate 1113, and two end plates 1112. The end plates 1112 and the surrounding plate 1113 are both fixed to the bottom plate 1111. The two end plates 1112 are arranged opposite to each other at both ends of the bottom plate 1111. The two ends of the surrounding plate 1113 are respectively fixed to one end of the two end plates 1112. The bottom plate 1111, the surrounding plate 1113, and the two end plates 1112 enclose each other to form a cavity with a side opening and a top opening. The side plates 112 are detachably fixed to the other end of the two end plates 1112 and the bottom plate 1111 to close the side opening. The top cover 12 is detachably fixed to the surrounding plate 1113 and the end of the two end plates 1112 away from the bottom plate 1111 to close the top opening. The battery cell assembly 2 is placed inside the cavity. Along the first direction X, the heat-conducting sheet 3 is disposed between the side of the battery cell assembly 2 and the surface of the enclosure 1113 facing the cavity. The heat-conducting sheet 3 is attached to the side of the battery cell assembly 2 and the surface of the enclosure 1113 facing the cavity, respectively. The first direction X is the direction of the enclosure 1113 facing the side opening of the main housing 111 cavity.

[0024] For the aforementioned cell assembly 2, please refer to Figure 4 The battery cell assembly 2 includes several battery cell groups 21. Along the second direction Y, the several battery cell groups 21 are placed sequentially. Any two adjacent battery cell groups 21 are connected by an electrode connecting piece, which connects the positive electrode of one battery cell group 21 to the negative electrode of the other battery cell group 21. Each battery cell group 21 includes several battery cells 211 and several heat insulation sheets 212. Along the first direction X, the several battery cells 211 are placed sequentially, and a heat insulation sheet 212 is provided between any two adjacent battery cells 211. The heat insulation sheets 212 are respectively attached to the side of the two adjacent battery cells 211 along the first direction. The second direction Y is the direction from one end plate 1112 of the main housing 111 to the other end plate 1112. The first direction X is perpendicular to the second direction Y.

[0025] In some embodiments, please refer to Figure 3 and Figure 5Along the second direction Y, the cell assembly 2 has two end faces 22. Along the third direction Z, the cell assembly 2 also has a bottom face 23. One end face 22 of the battery assembly 2 corresponds to one end plate 1113 of the main housing 111. The battery pack 100 also includes a second insulating sheet 5 and two first insulating sheets 4. A first insulating sheet 4 is disposed between the opposite end face 22 and the end plate 1112. The first insulating sheet 4 is respectively attached to the end face 22 of the cell assembly 2 and the surface of the end plate 1112 facing the cavity. The second insulating sheet 5 is disposed between the bottom plate 1111 and the bottom face 23 of the cell assembly 2. The second insulating sheet 5 is respectively attached to the bottom face 23 of the cell assembly 2 and the surface of the bottom plate 1111 facing the cavity. The insulating sheet is used to prevent leakage to the end plate 1112 and the bottom plate 1111 of the main housing 111 when the cell assembly 2 is accidentally damaged. The third direction Z is perpendicular to the first direction X and the second direction Y.

[0026] In some embodiments, please refer to Figure 6 and Figure 8 The main housing 111 also includes several isolation rods 1114. The isolation rods 1114 are fixed at intervals to the surface of the bottom plate 1111 facing the cavity of the main housing 111. The isolation rods 1114 divide the cavity into several cell isolation compartments. One cell isolation compartment corresponds to one cell group 21. One cell group 21 is set in one cell isolation compartment. An isolation rod 1114 is spaced between any two adjacent cell groups 21 to form a heat dissipation gap between any two adjacent cell groups 21, preventing direct contact between adjacent cell groups 21 and heat transfer between them, which would cause heat accumulation and thermal runaway. The isolation rod 1114 has several through holes 1114a on the side away from the base plate 1111. When welding the isolation rod 1114, the welding equipment extends into the through holes 1114a and welds from the inside of the isolation rod 1114. This allows the welding point to be located inside the isolation rod 1114, preventing the protruding weld point from pressing on the surface of the battery cell 211 and causing damage to the battery cell 211.

[0027] In some embodiments, please refer to Figure 6 and Figure 7Along the first direction X, the end of the bottom plate 1111 away from the surrounding plate 1113 protrudes from the two end plates 1112. The end plate 1112 includes an end plate body 1112a and a first fold 1112b. The end plate body 1112a is fixed to the surrounding plate 1113 and the bottom plate 1111 respectively. The first fold 1112b is vertically fixed to the other end of the end plate body 1112a away from the surrounding plate 1113. The side plate 112 includes a side plate body 1121 and a second fold 1122. The second fold 1122 is vertically fixed to the bottom end of the side plate body 1121. When the side plate 112 is fixed to the main body 111, the second fold 1122 is attached to and fixed to the part of the bottom plate 1111 that protrudes from the two end plates 1112 along the first direction X. The side plate body 1121 is attached to and fixed to the first fold 1112b of the two end plates 1112.

[0028] In some embodiments, the end plate 1112 further includes a third fold 1112c, which is vertically fixed to the top of the end plate body 1112a away from the bottom plate 1111. The side plate 112 further includes a fourth fold 1123, which is vertically fixed to the top of the side plate body 1121. The enclosure 1113 is also provided with a fifth fold 1113a at its top away from the bottom plate 1111. When the top cover 12 is fixed to the main box 111, the top cover 12 is attached to and fixed to the third fold 1112c, the fourth fold 1123 and the fifth fold 1113a.

[0029] In this embodiment of the invention, the battery pack 100 includes a housing 1, a cell assembly 2, and a heat-conducting sheet 3. The housing 1 has a battery compartment 10, in which the cell assembly 2 is housed. The heat-conducting sheet 3 is disposed between the cell assembly 2 and the inner surface of the housing 1, and is attached to both the cell assembly 2 and the inner surface of the housing 1. The cell assembly 2 directly contacts the inner surface of the housing 1 through the heat-conducting sheet 3, saving space and reducing the volume of the battery pack 100. When the battery pack 100 is working, the heat generated by the cell assembly 2 can be directly and quickly transferred to the housing 1 for heat dissipation through the heat-conducting sheet 3, without the need for air as a medium, resulting in high heat dissipation efficiency and eliminating the need for an additional heat dissipation module, thus saving production costs.

[0030] This utility model provides an embodiment of an energy storage device, which includes the battery pack 100 described above. The structure and function of the battery pack 100 can be found in the above embodiment, and will not be repeated here.

[0031] It should be noted that while the preferred embodiments of this utility model are provided in the specification and accompanying drawings, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are not intended to impose additional limitations on the content of this utility model; their purpose is to provide a more thorough and comprehensive understanding of the disclosure of this utility model. Furthermore, the above-described technical features can be combined with each other to form various embodiments not listed above, all of which are considered to be within the scope of this utility model specification. Moreover, those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A battery pack, characterized in that, include: The casing includes a battery compartment. A battery cell assembly, wherein the battery cell assembly is housed in the battery compartment; A heat-conducting sheet is disposed between the inner surfaces of the battery cell assembly and the housing, and the heat-conducting sheet is respectively attached to the inner surfaces of the battery cell assembly and the housing.

2. The battery pack according to claim 1, characterized in that, The box body includes a lower box body and an upper cover. The lower box body includes a main box body and side panels. The main box body includes a bottom plate, two end plates and a surrounding plate. The two end plates are disposed opposite to the bottom plate, and the two ends of the enclosure are respectively fixed to one end of the two end plates. The enclosure is also fixed to the bottom plate. The bottom plate, the two end plates, and the enclosure enclose a cavity with a side opening and a top opening. The inner surface of the enclosure includes the surface of the enclosure facing the cavity. The heat-conducting sheet is disposed between the enclosure and the side of the battery cell assembly along the first direction. The heat-conducting sheet is respectively attached to the side of the battery cell assembly along the first direction and the surface of the enclosure facing the cavity. The side plate is detachably fixed to the other end of the two end plates and the bottom plate to close the side opening, and the top cover is detachably fixed to the end of the surrounding plate and the two end plates away from the bottom plate to close the top opening.

3. The battery pack according to claim 2, characterized in that, The battery cell assembly has two end faces along a second direction, which is perpendicular to the first direction. The battery pack also includes two first insulating sheets, one of which is disposed between one end face and one end plate.

4. The battery pack according to claim 3, characterized in that, The cell assembly has a bottom surface along a third direction, and the first direction, the second direction, and the third direction are perpendicular to each other; The battery pack also includes a second insulating sheet disposed between the base plate and the bottom surface of the cell assembly.

5. The battery pack according to claim 2, characterized in that, The battery cell assembly further includes several battery cell groups, which are arranged sequentially along a second direction. Each battery cell group includes several battery cells and several heat insulation sheets. The several battery cells are arranged sequentially along a first direction, and a heat insulation sheet is provided between any two adjacent battery cells along the first direction.

6. The battery pack according to claim 5, characterized in that, The main housing also includes several isolation rods, which are fixed to the base plate at intervals. Any two adjacent battery cells are spaced apart by one isolation rod, so that any two adjacent battery cells have a heat dissipation gap.

7. The battery pack according to claim 6, characterized in that, The isolation rod has several through holes on the side opposite to the base plate.

8. The battery pack according to any one of claims 2-7, characterized in that, Along the first direction, the end of the bottom plate away from the surrounding plate protrudes from the two end plates; The end plate includes an end plate body and a first folded portion. The end plate body is fixed to the surrounding plate and the bottom plate respectively. The first folded portion is vertically fixed to the end plate body at the other end away from the surrounding plate. The side panel includes a side panel body and a second folded portion. The second folded portion is vertically fixed to the bottom end of the side panel body. The second folded portion is attached to and detachably fixed to the portion of the bottom plate that protrudes from the two end plates in a first direction. The side panel body is attached to and fixed to the first folded portion of the two end plates.

9. The battery pack according to claim 8, characterized in that, The end plate also includes a third fold, which is vertically fixed to the top of the end plate body away from the bottom plate; The side panel also includes a fourth fold, which is vertically fixed to the top of the side panel body; The top of the enclosure panel, away from the bottom plate, is provided with a fifth fold. The top cover is attached to and detachably fixed to the third, fourth, and fifth folds.

10. An energy storage device, characterized in that, Includes the battery pack as described in any one of claims 1-9.

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