Battery pack

Abstract

The utility model provides a battery pack. The battery pack comprises a lower shell and a battery cell module arranged in the lower shell, the battery cell module comprises a plurality of battery cell assemblies which are sequentially arranged in the front-back direction of the lower shell, each battery cell assembly comprises two battery cells which are arranged side by side in the front-back direction of the lower shell, and the two battery cells extend in the left-right direction of the lower shell; two adjacent battery cell assemblies are connected through a first busbar, two battery cells in each battery cell assembly are connected through a second busbar, the first busbar and the second busbar are arranged at the two ends of the two battery cell assemblies respectively, and an elastic heat insulation pad is arranged between the two adjacent battery cell assemblies. According to the battery pack disclosed by the utility model, the grouping efficiency and the grouping quality of the whole pack can be improved, and the improvement of the quality of the whole pack of products is facilitated.

Description

Technical Field

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

[0002] The performance of a battery pack is related to the grouping force of the battery cell modules when they are placed in the box. In the prior art, there are two ways to place battery cell modules in the box. One way is to place the battery cell modules in the box through tooling. The battery cell modules already have grouping force during the stacking process. Although this can ensure the grouping force of the battery cell modules, the equipment cost is high and the boxing process is complicated, which is not conducive to improving production efficiency. The other way is to place the battery cells directly into the box and stack them into battery cell modules. However, this method has the problems of high difficulty in stacking the battery cell modules and difficulty in ensuring the grouping force, which is not conducive to improving the grouping efficiency and ensuring the quality of the entire package. Utility Model Content

[0003] In view of this, the present invention aims to provide a battery pack that is conducive to improving grouping efficiency.

[0004] In order to achieve the above-mentioned purpose, the technical solution of the utility model is achieved as follows:

[0005] A battery pack comprises a lower shell and a battery cell module arranged in the lower shell;

[0006] The battery module includes a plurality of battery assemblies arranged in sequence along the front-to-back direction of the lower shell, each of the battery assemblies includes two battery cells arranged side by side along the front-to-back direction of the lower shell, and the two battery cells are extended along the left-to-right direction of the lower shell;

[0007] The two adjacent battery cell assemblies are connected by a first bus, and the two battery cells in each battery cell assembly are connected by a second bus. The first bus and the second bus are respectively arranged at the two ends of the two battery cell assemblies, and an elastic thermal insulation pad is provided between the two adjacent battery cell assemblies.

[0008] Furthermore, it also includes an electrical component arranged in the lower shell; the lower shell includes a base plate, and a frame and a first crossbeam arranged on the base plate, the first crossbeam is located in the frame, and divides the area formed by the frame and the base plate into a first installation cavity and a second installation cavity arranged in a front-to-back interval; the electrical component is arranged in the first installation cavity, and the battery cell module is arranged in the second installation cavity.

[0009] Furthermore, both ends of each battery cell are provided with a battery cell explosion-proof valve; in the height direction of the lower shell, the first bus and the second bus are both located above the battery cell explosion-proof valve on the same side, and the first bus and the second bus are both located above the frame.

[0010] Furthermore, a battery pack explosion-proof valve is provided on the frame, the frame is hollow and forms a first smoke exhaust channel connected to the battery pack explosion-proof valve, and a first exhaust port connected to the first smoke exhaust channel is provided on the inner wall of the frame, and the first exhaust port corresponds to the explosion-proof valve of each battery cell in the battery cell module.

[0011] Furthermore, the frame includes two side beams arranged relatively to each other along the left and right directions of the lower shell, and a front beam and a rear beam connected between the two side beams; the first installation cavity is formed in the area enclosed by the bottom plate, the front beam and the two side beams, and the second installation cavity is formed in the area enclosed by the bottom plate, the rear beam and the two side beams. The battery pack explosion-proof valve is provided on the front beam, and the first exhaust port is provided on the inner side walls of the two side beams.

[0012] Furthermore, the frame is provided with a second crossbeam located behind the first crossbeam, and the second installation cavity is formed in the area enclosed by the first crossbeam, the second crossbeam, the bottom plate and the side beams on both sides; the second installation cavity is provided with a longitudinal beam located in the middle of the left and right directions of the lower shell, and the two ends of the longitudinal beam are respectively connected to the first crossbeam and the second crossbeam to divide the second installation cavity into two sub-cavities, and each of the sub-cavities is provided with the battery cell module.

[0013] Furthermore, the first crossbeam is hollow and formed with a connecting channel connected to the first smoke exhaust channels on both sides, and the longitudinal beam is hollow and formed with a second smoke exhaust channel connected to the connecting channel; the longitudinal beam is provided with a second exhaust port connected to the second smoke exhaust channel on both sides along the left and right directions of the lower shell, and each battery cell explosion-proof valve close to the side of the longitudinal beam in each battery cell module is connected to the corresponding second exhaust port.

[0014] Furthermore, an adhesive layer is provided between each of the battery cell modules and the longitudinal beam, and / or an adhesive layer is provided between each of the battery cell modules and the corresponding side beam; each of the adhesive layers is located above the corresponding battery cell explosion-proof valve.

[0015] Furthermore, the frame is made of aluminum profile; and / or the electrical component includes a BDU.

[0016] Furthermore, the elastic thermal insulation pad is made of foam.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] The battery pack described in the present invention forms a battery cell assembly by stacking two battery cells, and directly puts each battery cell assembly into a box for stacking, and then connects the two adjacent battery cell assemblies after stacking in a step-by-step stacking manner. This not only achieves the purpose of conveniently and directly putting the battery cells into the box for grouping, but also can form a higher grouping force of the battery cell modules based on the step-by-step stacking method, thereby helping to improve the grouping efficiency and grouping quality of the entire package. At the same time, the provision of the elastic thermal insulation pad can also absorb the pre-tightening force between the battery cell assemblies on the basis of isolating thermal runaway, further facilitates the entry of the battery cell module into the box, improves the safety performance of the entire package, and thus helps to improve the quality of the entire package product.

[0019] Furthermore, the area enclosed by the frame and bottom plate is divided into a first installation cavity and a second installation cavity, spaced apart from each other in a front-to-back arrangement. The electrical components are positioned in the first installation cavity, and the battery cell modules are positioned in the second installation cavity. This prevents gas from flowing into the first installation cavity and interfering with the operation of the electrical components in the event of thermal runaway in the battery pack, thereby ensuring the safety of the electrical components and achieving good thermal and electrical separation for the battery pack, thereby improving the overall safety performance of the battery pack. By positioning the first and second busbars above the explosion-proof valves of the battery cells on the same side of the lower housing in terms of height, and by positioning the first and second busbars above the frame, the battery cell modules can be easily inserted into the housing while maintaining grouping force.

[0020] In addition, by forming a second installation cavity between the first crossbeam, the second crossbeam, the bottom plate, and the side beams on both sides, and dividing the second installation cavity into two sub-cavities by a longitudinal beam located in the middle of the lower shell in the left-right direction, a heat-electric separation arrangement is formed and the structural strength of the entire package is improved. By hollowing out the first crossbeam and forming a connecting channel connected to the first smoke exhaust channels on both sides, hollowing out the longitudinal beam and forming a second smoke exhaust channel connected to the connecting channel, and providing second exhaust ports connected to the second smoke exhaust channels on both sides of the longitudinal beam along the left-right direction of the lower shell, and each battery cell explosion-proof valve on the side of the longitudinal beam in each battery cell module close to the longitudinal beam is connected to the corresponding second exhaust port, using the longitudinal beam as a smoke exhaust channel can ensure the structural strength and safety of the entire package while improving space utilization.

[0021] In addition, by providing a corresponding adhesive layer above each battery cell explosion-proof valve, the smoke in the event of thermal runaway can be sealed to prevent it from escaping. Each frame is made of aluminum profiles, which helps maintain structural strength. The inner cavity of the aluminum profile can also be used to form a smoke exhaust channel, eliminating the need for additional channels and facilitating cost-effective design. The use of foam to create elastic insulation pads not only combines elasticity and thermal insulation properties, but also helps reduce costs, giving the battery pack a better cost advantage. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0023] Figure 1 This is a schematic diagram of the explosion structure of the battery pack according to an embodiment of the present utility model;

[0024] Figure 2 This is a schematic diagram of the lower housing structure of the battery pack according to an embodiment of the present utility model;

[0025] Figure 3 This is a schematic diagram of the exploded structure of the battery cell module according to an embodiment of the present utility model;

[0026] Figure 4 for Figure 3 Partial view at point C in the middle;

[0027] Figure 5 A top view of the battery pack according to an embodiment of the present invention;

[0028] Figure 6 for Figure 5 A cross-sectional view at AA is shown;

[0029] Figure 7 for Figure 6 Partial view at point B in the middle;

[0030] Figure 8 for Figure 6 Partial view at point D in the middle;

[0031] Description of reference numerals:

[0032] 10. Lower shell; 11. Bottom plate;

[0033] 111, frame; 1111, battery pack explosion-proof valve; 1112, first exhaust port; 1113, first smoke exhaust channel; 1114, side beam; 1115, front side beam; 1116, rear side beam;

[0034] 112, first crossbeam; 113, first mounting cavity; 114, second mounting cavity; 1141, sub-cavity; 115, second crossbeam;

[0035] 116, longitudinal beam; 1161, second smoke exhaust channel; 1162, second exhaust port; 117, reinforced cross beam;

[0036] 12. Battery cell module; 121. Battery cell assembly; 122. Battery cell; 123. First busbar; 124. Second busbar; 125. Elastic thermal insulation pad; 126. Battery cell explosion-proof valve; 127. Front end plate; 128. Rear end plate; 13. Electrical components; 14. Adhesive layer; 15. Upper shell. DETAILED DESCRIPTION

[0037] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0038] In the following description, specific details such as specific system structures and techniques are provided for purposes of illustration rather than limitation to facilitate a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid obscuring the description of the present application with unnecessary detail.

[0039] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," and "outer" appear to indicate orientation or positional relationships, these are based on the orientation or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, if terms such as "first" and "second" appear, they are used solely for descriptive purposes and should not be construed as indicating or implying relative importance.

[0040] Taking the battery pack housing the lower housing described in this utility model as an example, the directional terms used in the embodiments, such as "up," "down," "left," "right," "front," and "rear," are defined relative to the battery pack's up-down (also known as the height, or Z-direction), left-right (also known as the width, or Y-direction), and front-to-back (also known as the length, or X-direction). "Inside" and "outside" are defined relative to the outline of the corresponding component. For example, "inside" and "outside" are defined relative to the vehicle's outline, with the side closest to the center of the vehicle being considered "inside," and the opposite side being "outside."

[0041] Furthermore, in the description of this utility model, unless otherwise explicitly defined, the terms "mounted," "connected," "connection," and "connector" should be interpreted broadly. For example, they can refer to fixed, removable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on specific circumstances.

[0042] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0043] This embodiment relates to a battery pack, which is beneficial to improving grouping efficiency, can improve the safety performance of the entire pack, and is beneficial to improving the quality of the entire pack product.

[0044] In terms of overall structure, Figures 1 to 8 As shown, the battery pack of this embodiment includes a lower housing 10 and a cell module 12 disposed in the lower housing. The cell module 12 includes a plurality of cell assemblies 121 arranged sequentially along the front-to-back direction of the lower housing 10. Each cell assembly 121 includes two cells 122 arranged side by side along the front-to-back direction of the lower housing 10. Both cells 122 extend along the left-to-right direction of the lower housing 10.

[0045] In addition, two adjacent battery cell assemblies 121 are connected via a first bus 123, and the two battery cells 122 in each battery cell assembly 121 are connected via a second bus 124. The first bus 123 and the second bus 124 are respectively arranged at the two ends of the two battery cell assemblies 121, and an elastic thermal insulation pad 125 is provided between two adjacent battery cell assemblies 121.

[0046] At this time, as set above, the battery cell assembly 121 is formed by stacking two battery cells 122, and each battery cell assembly 121 is directly put into the box for stacking, and the two adjacent battery cell assemblies 121 are connected after stacking. The step-by-step stacking method can not only achieve the purpose of conveniently and directly putting the battery cells 122 into the box for grouping, but also can form a higher grouping force for the battery cell module 12 based on the step-by-step stacking method, thereby helping to improve the grouping efficiency and grouping quality of the entire package. At the same time, the setting of the elastic thermal insulation pad 125 can also absorb the pre-tightening force between the battery cell assemblies 121 on the basis of isolating thermal runaway, further facilitate the entry of the battery cell module 12 into the box, improve the safety performance of the entire package, and thus help to improve the quality of the entire package product.

[0047] Based on the above overview, let's discuss in detail the battery pack in this embodiment. In practice, the battery pack also includes an upper housing 15, which, in conjunction with the lower housing 10, seals the entire battery pack. Furthermore, the cell module 12 includes a front plate 127 and a rear plate 128 to ensure secure and reliable installation of the cell module 12. Any related structures not described in this embodiment of the battery pack can be referenced to the various structures of battery products known to those skilled in the art.

[0048] In addition, in the specific implementation, the busbar is welded in steps. Specifically, before the battery cells 122 are stacked, the two battery cells 122 are welded into a battery cell assembly 121 through the first busbar 123. After the battery cell assembly 121 is formed, it is stacked as a whole together with the elastic insulation pad 125 to form a battery cell module 12. Subsequently, when the battery cell module 12 is put into the box, the second busbar 124 on the other side is welded.

[0049] In this embodiment, as a preferred implementation form, Figure 1 and Figure 2 As shown, the battery pack in this embodiment further includes an electrical component 13 disposed in the lower housing 10. The lower housing 10 includes a bottom plate 11, a frame 111, and a first crossbeam 112 disposed on the bottom plate. The first crossbeam 112 is located in the frame 111 and divides the area enclosed by the frame 111 and the bottom plate 11 into a first installation cavity 113 and a second installation cavity 114 arranged in a front-to-back arrangement. The electrical component 13 is disposed in the first installation cavity 113, and the battery cell module 12 is disposed in the second installation cavity 114.

[0050] It can be understood that when the battery cell module 12 located in the second installation cavity 114 experiences thermal runaway, it can prevent gas from flowing into the first installation cavity 113 and interfering with the operation of the electrical component 13, thereby ensuring the safety of the electrical component 13 and achieving a good thermal and electrical separation effect of the battery pack, which is beneficial to improving the overall safety performance of the battery pack.

[0051] In this embodiment, as a preferred implementation form, Figure 4 As shown, each cell 122 is provided with a cell explosion-proof valve 126 at each end. Furthermore, in the height direction of the lower housing 10, the first busbar 123 and the second busbar 124 are both located above the cell explosion-proof valve 126 on the same side thereof, and both the first busbar 123 and the second busbar 124 are located above the frame 111. This facilitates the insertion of the cell modules 12 into the housing while ensuring grouping.

[0052] In this embodiment, as a preferred implementation form, a battery pack explosion-proof valve 1111 is provided on the frame 111. The frame 111 is hollow and forms a first smoke exhaust channel 1113 connected to the battery pack explosion-proof valve 1111, and a first exhaust port 1112 connected to the first smoke exhaust channel 1113 is provided on the inner wall of the frame 111. The first exhaust port 1112 is corresponding to the explosion-proof valves 126 of each battery cell in the battery cell module 12.

[0053] Therefore, through the first smoke exhaust channel 1113 formed by the hollow frame 111 and the battery pack explosion-proof valve 1111 provided on the frame 111, when thermal runaway occurs in the battery pack, the gas rushing out of the battery cell explosion-proof valve 126 is introduced into the first smoke exhaust channel 1113 through the first exhaust port 1112, and finally discharged by the battery pack explosion-proof valve 1111 provided on the frame 111, thereby avoiding the accumulation of high-pressure gas caused by thermal runaway in the battery pack, which is difficult to discharge, and is conducive to achieving a good thermal and electrical separation effect of the battery pack, thereby facilitating the improvement of the overall safety performance of the battery pack.

[0054] In this embodiment, as a preferred implementation form, the frame 111 includes two side beams 1114 arranged relatively along the left and right directions of the lower shell 10, and a front beam 1115 and a rear beam 1116 connected between the two side beams 1114. In the specific structure, the first installation cavity 113 is formed in the area enclosed by the bottom plate 11, the front beam 1115 and the two side beams 1114, and the second installation cavity 114 is formed in the area enclosed by the bottom plate 11, the rear beam 1116 and the two side beams 1114. The battery pack explosion-proof valve 1111 is provided on the front beam 1115, and the first exhaust port 1112 is provided on the inner side walls of the two side beams 1114.

[0055] This simplifies the overall structure of the battery pack, helping to reduce its manufacturing costs. Furthermore, in specific implementations, the battery pack explosion-proof valve 1111 can be positioned on the frame 111 to meet the needs of thermal runaway pressure relief. Preferably, two battery pack explosion-proof valves 1111 are provided, both located on the front side beam 1115.

[0056] In this embodiment, as a preferred implementation form, Figure 1 、 Figure 2 and Figure 5 As shown, the frame 111 is provided with a second crossbeam 115 located behind the first crossbeam 112, and the second installation cavity 114 is formed in the area enclosed by the first crossbeam 112, the second crossbeam 115, the bottom plate 11 and the side beams 1114 on both sides. The second installation cavity 114 is provided with a longitudinal beam 116 located in the middle of the left and right directions of the lower shell 10, and the two ends of the longitudinal beam 116 are respectively connected to the first crossbeam 112 and the second crossbeam 115 to divide the second installation cavity 114 into two sub-cavities 1141, and each sub-cavity 1141 is provided with a battery cell module 12.

[0057] Here, the longitudinal beam 116 is conducive to forming a thermal and electrical separation arrangement structure while improving the structural strength of the entire package. At the same time, it can also prevent the safety of other battery modules 12 from being affected when one of the multiple battery modules 12 fails.

[0058] In addition, see Figure 2As shown, the second mounting cavity 114 is divided into four sub-cavities 1141 by the longitudinal beams 116 and the reinforcing cross beams 117. Each sub-cavity 1141 is correspondingly provided with a battery cell module 12. The portion of the battery cell module 12 adjacent to the reinforcing cross beams 117 abuts against the reinforcing cross beams 117 to ensure the reliable placement of each battery cell module 12. Of course, the number of sub-cavities 1141 divided into the second mounting cavity 114 can be adaptively adjusted according to the actual requirements of the battery pack. For example, the number of sub-cavities 1141 can also be four or six.

[0059] In this embodiment, as a preferred implementation, the first crossbeam 112 is hollow and formed with connecting channels that communicate with the first smoke exhaust channels 1113 on both sides. The longitudinal beam 116 is hollow and formed with second smoke exhaust channels 1161 that communicate with the connecting channels. The longitudinal beam 116 is provided with second exhaust ports 1162 connected to the second smoke exhaust channels 1161 on both sides of the longitudinal beam 116 along the left and right sides of the lower housing 10. Each cell explosion-proof valve 126 in each cell module 12 near the longitudinal beam 116 is connected to the corresponding second exhaust port 1162. It can be understood that using the longitudinal beam 116 as a smoke exhaust channel can improve space utilization while ensuring the structural strength and safety of the entire battery pack.

[0060] In this embodiment, as a preferred implementation form, an adhesive layer 14 is provided between each battery cell module 12 and the longitudinal beam 116. At the same time, an adhesive layer 14 is also provided between each battery cell module 12 and the corresponding side beam 1114. Each adhesive layer 14 is located above the corresponding battery cell explosion-proof valve 126. The provision of the adhesive layer 14 ensures airtightness between the battery cell module 12 and each side beam 1114 and the longitudinal beam 116, preventing smoke from escaping through the gaps between the battery cell module 12 and the longitudinal beam 116, or the gaps between the battery cell module 12 and the corresponding side beam 1114.

[0061] At this time, to explain in detail, in the specific implementation, after the battery cell module 12 is placed in the box, an adhesive layer 14 is set in the gap between the battery cell module 12 and the longitudinal beam 116 and each cross beam to block the gap between the battery cell module 12 and the longitudinal beam 116 and each cross beam, so as to prevent smoke from escaping through the gap and affecting the poles and electrical components 13 of the battery module, thereby causing serious safety hazards.

[0062] In this embodiment, as a preferred implementation, the frame 111 is made of aluminum. This configuration offers the advantage of reducing costs while maintaining structural strength. The aluminum profile's inner cavity can also be used to form a smoke exhaust channel, eliminating the need for secondary processing of the aluminum profile, further reducing manufacturing costs. In practice, welding can be used to connect the aluminum profiles, ensuring the overall structural strength of the frame.

[0063] In addition, the electrical component 13 of this embodiment may specifically include a BDU, and in a specific implementation, the related structural parts not mentioned in the electrical component 13 of this embodiment may adopt the various structures of the battery pack well known to people in this field, for example, it also includes a BMS and relays, etc., which will not be repeated here.

[0064] In this embodiment, as a preferred implementation, the elastic thermal insulation pad 125 is made of foam. This can reduce the manufacturing cost of the battery pack, making the battery pack more cost-effective. In specific implementations, the foam in this embodiment can be PU foam, which is well known to those skilled in the art.

[0065] The battery pack of this embodiment adopts a step-by-step busbar welding method during the specific installation. First, before the battery cells 122 are stacked, the two battery cells 122 are welded into a battery cell assembly 121 through the first busbar 123 (there is no gap between the two battery cells 122 in the battery cell assembly 121). After the battery cell assembly 121 is formed, it is stacked as a whole. At this time, the elastic thermal insulation pads 125 are arranged between the battery cell assemblies 121 and stacked simultaneously when the battery cell assemblies 121 are stacked. After the multiple battery cell assemblies 121 with elastic thermal insulation pads 125 are stacked, they are clamped by a fixture and placed in the corresponding installation cavity of the lower shell 10. Then, after the stacked units are put into the box, the second busbar 124 on the other side is welded to form a battery cell module 12 after welding. Subsequently, the gap between the battery cell module 12 and the side beam and the longitudinal beam 116 is sealed by the adhesive layer 14 to prevent smoke from overflowing.

[0066] In this embodiment, when the battery has thermal runaway, the smoke will be discharged from the battery cell explosion-proof valves 126 on both sides of the battery cell 122. The smoke from the battery cell explosion-proof valve 126 near the side beam 1114 enters the first smoke exhaust channel 1113 through the first exhaust port 1112 provided on the side beam 1114. The smoke from the battery cell explosion-proof valve 126 near the side beam 116 enters the second smoke exhaust channel 1161 through the second exhaust hole provided on the longitudinal beam 116. The second smoke exhaust channel 1161 is connected to the first smoke exhaust channel 1113 through the first cross beam 112. The smoke is finally discharged by the battery pack explosion-proof valve 1111 provided on the front side beam 1115. In this way, when the battery cell 122 has thermal runaway, the smoke can be discharged from the battery pack, so that the battery pack can achieve better thermal and electrical separation.

[0067] In addition, during the exhaust process, the adhesive layer 14 provided between the battery cell module 12 and the cross beam and longitudinal beam 116 will seal the gap to prevent smoke from overflowing, and the elastic thermal insulation pad 125 provided between the battery cell components 121 will isolate the heat to prevent the battery cell component 121 that has thermal runaway from affecting the adjacent normal battery cell component 121, so that the battery cell 122 can better achieve thermal and electrical separation when thermal runaway occurs.

[0068] The battery pack described in the present invention forms a battery cell assembly 121 by stacking two battery cells 122, and directly puts each battery cell assembly 121 into a box for stacking, and then connects the two adjacent battery cell assemblies 121 after stacking. This step-by-step stacking method can not only achieve the purpose of conveniently and directly putting the battery cells 122 into the box for grouping, but also can form a higher grouping force for the battery cell module 12 based on the step-by-step stacking method, thereby helping to improve the grouping efficiency and grouping quality of the entire package. At the same time, the provision of the elastic thermal insulation pad 125 can also absorb the pre-tightening force between the battery cell assemblies 121 on the basis of isolating thermal runaway, further facilitate the entry of the battery cell module 12 into the box, improve the safety performance of the entire package, and thus help to improve the quality of the entire package product.

[0069] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A battery pack, characterized in that: It includes a lower shell and a battery cell module arranged in the lower shell; The battery module includes a plurality of battery assemblies arranged in sequence along the front-to-back direction of the lower shell, each of the battery assemblies includes two battery cells arranged side by side along the front-to-back direction of the lower shell, and the two battery cells are extended along the left-to-right direction of the lower shell; The two adjacent battery cell assemblies are connected by a first bus, and the two battery cells in each battery cell assembly are connected by a second bus. The first bus and the second bus are respectively arranged at the two ends of the two battery cell assemblies, and an elastic thermal insulation pad is provided between the two adjacent battery cell assemblies.

2. The battery pack according to claim 1, wherein: Also included is an electrical assembly disposed in the lower housing; The lower shell includes a bottom plate, a frame and a first crossbeam provided on the bottom plate, wherein the first crossbeam is located in the frame and divides the area enclosed by the frame and the bottom plate into a first installation cavity and a second installation cavity arranged in a front-to-back manner; The electrical component is arranged in the first installation cavity, and the battery cell module is arranged in the second installation cavity.

3. The battery pack according to claim 2, wherein: Both ends of each battery cell are provided with a battery cell explosion-proof valve; In the height direction of the lower shell, the first busbar and the second busbar are both located above the battery cell explosion-proof valves on the same side thereof, and the first busbar and the second busbar are both located above the frame.

4. The battery pack according to claim 2, wherein: A battery pack explosion-proof valve is provided on the frame, and a first smoke exhaust channel connected to the battery pack explosion-proof valve is formed in the frame. A first exhaust port connected to the first smoke exhaust channel is provided on the inner side wall of the frame, and the first exhaust port is correspondingly connected to the explosion-proof valves of each battery cell in the battery cell module.

5. The battery pack according to claim 4, wherein: The frame includes two side beams arranged opposite to each other along the left and right directions of the lower shell, and a front side beam and a rear side beam connected between the two side beams; The first installation cavity is formed in the area enclosed by the bottom plate, the front side beam and the two side beams, and the second installation cavity is formed in the area enclosed by the bottom plate, the rear side beam and the two side beams. The battery pack explosion-proof valve is provided on the front side beam, and the first exhaust port is provided on the inner side walls of the two side beams.

6. The battery pack according to claim 5, wherein: The frame is provided with a second crossbeam located behind the first crossbeam, and the second installation cavity is formed in an area enclosed by the first crossbeam, the second crossbeam, the bottom plate and the side beams on both sides; A longitudinal beam is provided in the second installation cavity and is located in the middle of the lower shell in the left and right directions. The two ends of the longitudinal beam are respectively connected to the first cross beam and the second cross beam to divide the second installation cavity into two sub-cavities. The battery cell module is provided in each sub-cavity.

7. The battery pack according to claim 6, wherein: The first cross beam is hollow and formed with a communication channel connected to the first smoke exhaust channels on both sides, and the longitudinal beam is hollow and formed with a second smoke exhaust channel connected to the communication channel; The longitudinal beam is provided with second exhaust ports connected to the second smoke exhaust channel on both sides along the left and right directions of the lower shell, and each battery cell explosion-proof valve close to the longitudinal beam in each battery cell module is connected to the corresponding second exhaust port.

8. The battery pack according to claim 6, wherein: An adhesive layer is provided between each of the battery cell modules and the longitudinal beam, and / or an adhesive layer is provided between each of the battery cell modules and the corresponding side beam; Each of the adhesive layers is located above the corresponding explosion-proof valve of the battery cell.

9. The battery pack according to claim 2, wherein: The frame is made of aluminum profile; and / or the electrical component includes a BDU.

10. The battery pack according to any one of claims 1 to 9, characterized in that: The elastic heat-insulating pad is made of foam.

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