Battery pack

Abstract

The utility model provides a battery pack which comprises a lower box body, a top cover, an upper cover body and an electric system assembly, a first accommodating space is arranged in the lower box body, a battery cell stack is accommodated in the first accommodating space, the top cover is used for sealing the first accommodating space, the upper cover body is located on the side, away from the lower box body, of the top cover, a second accommodating space is defined by the upper cover body and the top cover, and the electric system assembly is arranged in the second accommodating space. The electrical system assembly is located in the second containing space, so that the second containing space and the first containing space are completely isolated by the top cover, it is ensured that the situation that the core stack is mistakenly shocked when the electrical system is maintained in the later period is avoided, and the risk of external short circuit is avoided; besides, the electric system assembly is located above the battery cell stacking body, the arrangement of the electric system assembly utilizes the space of the battery pack in the height direction, the layout compactness of the battery pack is improved, the internal structure layout of the battery pack is optimized, and the volume grouping rate of the battery pack is further improved.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and more particularly to a battery pack. Background Technology

[0002] Cylindrical batteries offer good consistency, high production efficiency, and strong heat dissipation at the system level. Upgrading their size can improve upon their original problems such as low single-cell energy density, high cell requirements for modules, poor lifespan, and complex management. However, in current common cylindrical battery packs, the electrical system, battery management system, and cells are placed on the same layer. This structure leads to a low volumetric packing efficiency. Utility Model Content

[0003] In view of this, the purpose of this application is to provide a battery pack to solve or partially solve the problems raised in the prior art.

[0004] For the purposes described above, this application provides a battery pack, comprising:

[0005] The lower housing has a first accommodating space inside, which contains a stack of battery cells.

[0006] Top cover, used to seal the first receiving space;

[0007] The upper cover is located on the side of the top cover away from the lower box, and the upper cover and the top cover together form a second accommodating space;

[0008] An electrical system assembly, located within the second housing space, includes an electrical system and / or a battery management system.

[0009] Optionally, a support bracket is also included, located between the battery management system and the top cover.

[0010] Optionally, the support bracket includes a support part and two oppositely arranged connecting parts. One end of each connecting part is connected to the upper cover, and the other end of each connecting part is connected to the support part. There is a gap between the support part and the upper cover. The battery management system is located on the side of the support part away from the upper cover.

[0011] Optionally, the battery cell stack includes multiple battery cell groups arranged along a first direction, each battery cell group including multiple battery cells arranged along a second direction, the first direction intersecting the second direction, and the gaps between two adjacent battery cells, between a battery cell and the lower housing, and between a battery cell and the top cover are filled with an adhesive layer.

[0012] Optionally, the adhesive layer is a foamed polyurethane adhesive layer.

[0013] Optionally, it also includes a thermal management system, which includes multiple liquid cooling plates, an inlet pipe and an outlet pipe. The multiple liquid cooling plates are spaced apart along a first direction, and at least one battery cell assembly is provided between two adjacent liquid cooling plates. Each liquid cooling plate is provided with an inlet and an outlet, with the inlet connected to the inlet pipe and the outlet connected to the outlet pipe.

[0014] Optionally, the inlet and outlet pipes are located on the same side of the cell stack, with the inlet located above the outlet.

[0015] Optionally, each liquid cooling plate has a thermally conductive adhesive layer on the side closest to the battery cell assembly, and the liquid cooling plate and the battery cell assembly are connected through the thermally conductive adhesive layer.

[0016] Optionally, the first accommodating space is further provided with a busbar and an output copper busbar located on top of the cell stack. The busbar is connected to the cell stack, and the output copper busbar is connected to both the busbar and the electrical system.

[0017] Optionally, a connecting harness is also provided in the first accommodating space. The connecting harness is located above the cell stack and is connected to both the busbar and the battery management system.

[0018] As can be seen from the above, the battery pack provided in this application includes a lower casing, a top cover, an upper cover, and an electrical system assembly. The lower casing has a first accommodating space inside, which contains a stack of battery cells. The top cover is used to seal the first accommodating space. The upper cover is located on the side of the top cover away from the lower casing. The upper cover and the top cover together form a second accommodating space, in which the electrical system assembly is located. Thus, the second accommodating space and the first accommodating space are completely isolated by the top cover, ensuring that the electrical system assembly in the second accommodating space and the stack of battery cells in the first accommodating space are completely isolated from each other. This ensures that the battery cells will not be accidentally touched during electrical system maintenance, and there is no risk of external short circuit. At the same time, the complete isolation between the electrical system assembly and the stack of battery cells ensures that the electrical system assembly will not be stuck by glue during the potting process of the stack of battery cells, ensuring that the electrical system assembly can be removed for maintenance later. In addition, the entire top cover can serve as a support for the electrical system assembly, ensuring it can withstand the total weight of the assembly and preventing excessive pressure on the cell stack, thus avoiding impact on battery performance. Simultaneously, the electrical system assembly is located above the cell stack, and its arrangement utilizes the vertical space of the battery pack, improving its compactness, optimizing its internal structure, and ultimately increasing its volumetric efficiency. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art 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 these drawings without creative effort.

[0020] Figure 1 This paper shows a schematic diagram of a first exploded structure of a battery pack according to an embodiment of this application;

[0021] Figure 2 A second exploded structure diagram of the battery pack according to an embodiment of this application is shown;

[0022] Figure 3 A schematic diagram of a third exploded structure of a battery pack according to an embodiment of this application is shown;

[0023] Figure 4 This paper shows a schematic diagram of the structure after two battery cell groups are connected according to an embodiment of this application;

[0024] Figure 5 A schematic diagram of the internal structure of the lower housing and the first accommodating space according to an embodiment of this application is shown.

[0025] In the diagram: 1. Lower housing; 2. Top cover; 3. Upper cover; 4. Electrical system assembly; 41. Electrical system; 42. Battery management system; 5. Cell stack; 51. Cell assembly; 511. Cell; 6. Thermal management system; 61. Liquid cooling plate; 611. Liquid inlet; 612. Liquid outlet; 62. Liquid outlet pipe; 63. Liquid inlet pipe; 7. Support bracket; 71. Connecting part; 72. Supporting part; 8. Connector; 9. Output copper busbar; 10. Connecting wire harness; 11. Busbar; 12. Thermally conductive adhesive layer; 13. First receiving space; 14. Second receiving space. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0027] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word covers the element or object listed following the word and its equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0028] Cylindrical batteries offer significant advantages in the electric vehicle sector and are expected to become the optimal solution for mid-to-high-end electric vehicles. Cylindrical batteries exhibit good consistency, high production efficiency, and strong heat dissipation at the system level. Upgrading their size can improve upon their original problems such as low single-cell energy density, the need for numerous cells in modules, poor lifespan, and complex management.

[0029] In common cylindrical battery packs, the electrical system, battery management system, and battery cells are placed on the same layer and separated by a central beam. This structure results in a low volumetric packing ratio, making it impossible to utilize the height space of the battery pack. Furthermore, the electrical system, battery management system, and battery cells share a single top cover, making it difficult to remove and replace the electrical system and battery management system.

[0030] In some cylindrical battery packs, a mounting port is provided on the top cover. The electrical system and battery management system are installed at the mounting port position above the cell stack via mounting brackets and protrude from the mounting port. In this structure, the electrical system and battery management system can utilize the space in the height direction of the battery pack, thereby improving the volumetric packing efficiency.

[0031] However, this structure has a drawback: the electrical system and battery management system are not isolated from the cell stack. During later maintenance of the electrical system, it's easy to accidentally touch the busbar at the top of the cell stack, posing a risk of external short circuit. Furthermore, during the potting process, the potting height is difficult to control. If the electrical system and battery management system are not isolated from the cell stack, the adhesive can easily cover the electrical system, making it difficult to remove them for subsequent maintenance. Additionally, a single support bracket cannot withstand the total weight of the electrical system and battery management system, easily causing excessive pressure on the cell stack and affecting battery performance.

[0032] Therefore, there is an urgent need to provide a new battery pack structure to improve the volumetric packing efficiency without affecting the performance of the battery pack.

[0033] Based on this, this application provides a battery pack.

[0034] Figure 1 This paper shows a schematic diagram of a first exploded structure of a battery pack according to an embodiment of this application. Figure 2 A second exploded structure diagram of a battery pack according to an embodiment of this application is shown.

[0035] See Figure 1 and Figure 2 As shown, the battery pack includes:

[0036] The lower housing 1 has a first accommodating space 13 inside, which contains a battery cell stack 5.

[0037] Top cover 2, used to seal the first receiving space 13;

[0038] The upper cover 3 is located on the side of the top cover 2 away from the lower box 1, and the upper cover 3 and the top cover 2 together form a second accommodating space 14;

[0039] The electrical system assembly 4 is located within the second accommodating space 14, and the electrical system assembly 4 includes an electrical system 41 and / or a battery management system 42.

[0040] Specifically, the lower housing 1 is a hollow housing structure with a first receiving space 13 inside, which houses the battery cell stack 5. The battery cell stack 5 includes components along a first direction (i.e., Figure 2 Multiple cell groups 51 are arranged in the direction shown in A, and each cell group 51 includes cells arranged along the second direction (i.e., Figure 2 Multiple battery cells 511 are arranged in the direction shown in B, with the first direction intersecting the second direction.

[0041] The top cover 2 is used to seal the first receiving space 13, so that the battery cell stack 5 is placed in the sealed first receiving space, so that the battery cell stack 5 is not affected by other components located outside the first receiving space 13, thus ensuring the safety of the battery cell stack 5.

[0042] The upper cover 3 is located on the side of the top cover 2 away from the lower housing 1, that is, the upper cover 3 is located above the top cover 2. The upper cover 3 and the top cover 2 together form a second receiving space 14. The electrical system assembly 4 is located in the second receiving space 14. In this way, the second receiving space 14 and the first receiving space 13 are completely isolated by the top cover 2, so that the electrical system assembly 4 located in the second receiving space 14 and the cell stack 5 located in the first receiving space 13 are completely isolated from each other. This ensures that there will be no accidental contact with the cell stack 5 during the later maintenance of the electrical system 41, and there will be no risk of external short circuit. This ensures the safety of the cell stack 5 during the maintenance process. At the same time, the complete isolation between the electrical system assembly 4 and the cell stack 5 ensures that the electrical system assembly 4 will not be stuck by glue during the potting process of the cell stack 5, and ensures that the electrical system assembly 4 can be removed during the later maintenance.

[0043] In addition, the upper cover 3 and the top cover 2 together form a second receiving space 14, and the electrical system assembly 4 is located in the second receiving space 14. In this way, the entire top cover 2 can serve as a support for the electrical system assembly 4, ensuring that it can withstand the total weight of the electrical system assembly 4, and will not cause the cell stack 5 to be subjected to too much pressure, thus not affecting the battery performance.

[0044] Furthermore, the upper cover 3 is located on the side of the top cover 2 away from the lower casing 1, that is, the upper cover 3 is located above the top cover 2, and the electrical system assembly 4 is located within the second accommodating space 14 formed by the upper cover 3 and the top cover 2. Thus, the electrical system assembly 4 is located above the cell stack 5. In this way, the arrangement of the electrical system assembly 4 can utilize the space in the height direction of the battery pack, improve the compactness of the battery pack layout, optimize the internal structural layout of the battery pack, and thereby improve the volumetric assembly rate of the battery pack.

[0045] The electric system assembly 4 includes an electrical system 41 and / or a battery management system 42. For example, the electric system assembly 4 may include only the electrical system 41, only the battery management system 42, or both the electrical system 41 and the battery management system 42. There is no specific limitation, and it can be set according to actual needs.

[0046] Both the electrical system 41 and the battery management system 42 are connected to the cell stack 5. For example, a connection hole (not shown in the figure) is provided on the top cover 2, and both the electrical system 41 and the battery management system 42 can be connected to the connection components (such as busbars, low-voltage harnesses, etc.) on the cell stack 5 through wires to realize signal transmission between the electrical system 41 and the cell stack 5, as well as signal transmission between the battery management system 42 and the cell stack 5.

[0047] It is worth noting that the location of the connection hole on the top cover 2 needs to be sealed with sealant after the wire passes through, to ensure that the battery cell stack 5 in the first accommodating space 13 can meet the protection standards.

[0048] The battery management system 42 is used to collect and monitor key parameters such as voltage, current and temperature of the battery pack in real time. It can cut off the power supply in time when the battery is overcharged, over-discharged, overcurrent and over-temperature, so as to prevent the battery from being damaged or even exploded, thereby ensuring the safety of the battery.

[0049] The electrical system 41 is mainly used to transmit electrical energy from the battery pack, as well as to transmit detection and control signals, to ensure the normal operation and monitoring of the battery pack.

[0050] In some embodiments, see continue to see Figure 2 As shown, the battery pack also includes a support bracket 7, which is located between the battery management system 42 and the upper cover 3.

[0051] Specifically, the support bracket 7 is located between the battery management system 42 and the top cover 3, so that the support bracket 7 can support the battery management system 42 together with the top cover 2 to ensure that the weight of the battery management system 42 will not damage or adversely affect the cell stack 5.

[0052] In some embodiments, see continue to see Figure 2 As shown, the support bracket 7 includes a support part 72 and two connecting parts 71 arranged opposite to each other. One end of each connecting part 71 is connected to the upper cover 3, and the other end of each connecting part 71 is connected to the support part 72. There is a gap between the support part 72 and the upper cover 3. The battery management system 42 is located on the side of the support part 72 away from the upper cover 3.

[0053] Specifically, one end of each connecting part 71 is connected to the upper cover 3, and the other end of each connecting part 71 is connected to the support part 72. This allows the support part 72 to be not directly connected to the upper cover 3, thus creating a gap between the support part 72 and the upper cover 3. This gap facilitates heat dissipation of the battery management system 42. In this way, the heat generated by the battery management system 42 during use can be dissipated to the surrounding space through this gap, thereby preventing the heat generated by the battery management system 42 from being directly transferred to the cell stack 5 through the top cover 2, ensuring that the performance of the cell stack 5 is not affected.

[0054] In some embodiments, the gaps between two adjacent cells 511, between cell 511 and the lower housing 1, and between cell 511 and the top cover 2 are filled with an adhesive layer (not shown in the figure).

[0055] Specifically, the adhesive layer can be a structural adhesive layer. The adhesive layer serves three purposes: first, it secures the battery cell 511, ensuring its structural stability and preventing positional shifts during battery pack use; second, it, together with the top cover 2, supports the electrical system assembly 4, preventing deformation of the battery cell stack 5 under the weight of the electrical system assembly 4; and third, it increases the overall rigidity and structural strength of the battery pack.

[0056] Meanwhile, the adhesive layer is only located within the first accommodating space 13, and the adhesive layer is isolated from the electrical system assembly 4 by the top cover 2. Thus, the adhesive layer will not block the electrical system assembly 4, thereby not affecting the heat dissipation of the electrical system assembly 4 and subsequent maintenance.

[0057] In addition, the adhesive layer between two adjacent cells 511 can also ensure that heat will not spread between cells 511 in the event of thermal runaway, thus providing excellent thermal barrier performance.

[0058] In some embodiments, the adhesive layer can be a polyurethane foam adhesive layer. The polyurethane foam adhesive layer has a strong pressure resistance. Experiments have verified that the polyurethane foam adhesive layer has a compression deformation of 10% at a pressure of 1.98 MPa and a compression deformation of 0.002% at a pressure of 2000 Pa. When subjected to a pressure of 300 to 500 Pa (the sum of the surface pressure of the electrical system 41 and the battery management system 42), there is basically no deformation. This can ensure that the cell stack 5 will not deform due to the weight of the electrical system 41 and the battery management system 42.

[0059] Figure 3 A schematic diagram of a third exploded structure of a battery pack according to an embodiment of this application is shown. Figure 4 A schematic diagram of the structure after the two battery cell groups 51 of this application are connected is shown.

[0060] In some embodiments, see Figure 2 , Figure 3 and Figure 4 As shown, the battery pack also includes a thermal management system 6, which includes multiple liquid cooling plates 61, an inlet pipe 63, and an outlet pipe 62. The multiple liquid cooling plates 61 are spaced apart along a first direction, and at least one cell group 51 is arranged between two adjacent liquid cooling plates 61. Each liquid cooling plate 61 is provided with an inlet 611 and an outlet 612. The inlet 611 is connected to the inlet pipe 63, and the outlet 612 is connected to the outlet pipe 62.

[0061] Specifically, the liquid cooling plate 61 can be a serpentine liquid cooling plate 61, with a liquid flow channel (not shown in the figure) inside. The liquid cooling plate 61 includes an inlet 611 and an outlet 612. One end of the liquid cooling flow channel is connected to the inlet pipe 63 through the inlet 611, and the other end of the liquid cooling flow channel is connected to the outlet pipe 62 through the outlet 612. Thus, in actual use, external coolant can flow in from the inlet pipe 63, and flow sequentially through the inlet 611, the liquid flow channel, and the outlet 612, finally flowing out from the outlet pipe 62. The coolant flowing through the liquid cooling plate 61 can exchange heat with the cell assembly 51 located between the two liquid cooling plates 61 to cool the cell assembly 51 and improve the heat dissipation performance of the battery pack.

[0062] For example, the liquid flow channel can adopt a U-shaped design to increase the flow area of ​​the coolant, thereby improving the heat dissipation performance of the battery pack.

[0063] Among them, such as Figure 4 As shown, several adjacent liquid cooling plates 61 can share a single liquid inlet 611 and a liquid outlet 612 to improve the compactness of the structure. Or as... Figure 3 As shown, each liquid cooling plate 61 is provided with a separate liquid inlet 611 and liquid outlet 612 to improve the convenience of structural assembly.

[0064] In some embodiments, see continue to see Figure 2 , Figure 3 and Figure 4 As shown, the liquid inlet pipe 63 and the liquid outlet pipe 62 are located on the same side of the cell stack 5, and the liquid inlet 611 is located above the liquid outlet 612.

[0065] Specifically, the inlet pipe 63 and the outlet pipe 62 are located on the same side of the cell stack 5, which can increase the flow area of ​​the coolant and thus effectively reduce the temperature of the cell 511. At the same time, it can also save the space occupied by installing the inlet pipe 63 and the outlet pipe 62, and improve the compactness of the structure.

[0066] The inlet 611 is located above the outlet 612, that is, the inlet 611 is located above the liquid cooling plate 61, and the outlet 612 is located below the liquid cooling plate 61. In this way, during actual use, the coolant enters from the upper part of the liquid cooling plate 61, flows through the liquid cooling channel, and then flows out from the lower part of the liquid cooling plate 61, which can effectively reduce the temperature of the battery cell 511 and improve the heat dissipation performance of the battery cell 511.

[0067] In some embodiments, see continue to see Figure 2 As shown, each liquid cooling plate 61 has a thermally conductive adhesive layer 12 on the side near the battery cell assembly 51, and the liquid cooling plate 61 and the battery cell assembly 51 are connected through the thermally conductive adhesive layer 12.

[0068] Specifically, the battery cell assemblies 51 can be stacked by applying a thermally conductive adhesive layer 12 to the liquid cooling plate 61. The battery cell 511 and the liquid cooling plate 61 are connected by the thermally conductive adhesive layer 12. The thermal management components (such as temperature sensors, temperature detection chips, etc.) are attached to the sidewall of the battery cell 511. The thermally conductive adhesive layer 12 increases the thermal conductivity between the battery cell 511 and the thermal management components, while also increasing the system rigidity.

[0069] Figure 5 A schematic diagram of the internal structure of the lower housing 1 and the first accommodating space 13 according to an embodiment of this application is shown.

[0070] In some embodiments, see Figure 5 As shown, the first accommodating space 13 is also provided with a busbar 11 and an output copper busbar 9 located on top of the battery cell stack 5. The busbar 11 is connected to the battery cell stack 5, and the output copper busbar 9 is connected to both the busbar 11 and the electrical system 41.

[0071] Specifically, Figure 5 The bus 11 shown is only a layout diagram of the bus 11 when it is arranged on top of the cell stack 5, and does not represent the specific structure of the bus 11. The specific structure of the bus 11 is not limited here.

[0072] Bus 11 is used to connect multiple cells 511 in series or parallel, so that the multiple cells 511 form a whole. Bus 11 is the main current channel between cells 511 inside the battery pack. It is usually connected to the positive and negative terminals of the cells 511 by laser welding to ensure stable transmission of large current.

[0073] The output copper busbar 9 is typically made of highly conductive copper, which has good conductivity and ductility, and can meet the current transmission requirements of the battery pack. The high conductivity of the output copper busbar 9 ensures efficient and stable current transmission.

[0074] In practical applications, output copper busbar 9 and busbar 11 are directly connected together by welding or other connection methods. For example, polymer diffusion welding is a commonly used welding method that uses high-temperature heating to change the molecular and atomic states, thereby achieving a stable connection.

[0075] The output copper busbar 9 is connected to both the busbar 11 and the electrical system 41. That is, the output copper busbar 9 serves as a connection channel between the busbar 11 and the electrical system 41, which can efficiently transmit electrical energy and also transmit control signals from the electrical system 41, making it convenient for the electrical system 41 to distribute, regulate and control the voltage and current of each cell 511 and the entire battery pack.

[0076] In practice, the outer surface of the output copper busbar 9 must be properly insulated. For example, an insulating sleeve can be fitted on the outer surface of the output copper busbar 9. The insulating sleeve can be made of epoxy resin insulating material to prevent high voltage creepage between the output copper busbar 9 and the busbar 11.

[0077] In some embodiments, a connecting harness 10 is also provided in the first accommodating space 13. The connecting harness 10 is located above the cell stack 5 and is connected to both the busbar 11 and the battery management system 42.

[0078] Specifically, the connecting harness 10 is commonly referred to as the "low-voltage harness." The low-voltage harness is primarily used to transmit electrical and control signals, ensuring the normal operation and safety of the battery pack. It not only transmits current but also control signals, ensuring that all parts of the battery pack can work in coordination. Specifically, the low-voltage harness connects various electrical components, such as controllers, sensors, and actuators, to realize various functions of the battery pack. For example, it can transmit battery pack status information to other vehicle systems, such as the instrument panel and charging system, while simultaneously receiving control signals from other systems, such as charging commands and temperature control signals.

[0079] The connecting harness 10 is connected to both the busbar 11 and the battery management system 42, serving as the connection channel between the busbar 11 and the battery management system 42. Each battery cell 511 is connected to the busbar 11 via a copper strip, and the busbar 11 is then connected to the battery management system 42 via the connecting harness 10. In this way, the electrical signals of each battery cell 511 can be transmitted to the battery management system 42 through the busbar 11 and the connecting harness 10, enabling real-time monitoring and control of the battery cell 511's status.

[0080] In some embodiments, when assembling the battery pack, the left side can be used as the positioning reference, and a tolerance gap can be left on the right side. Each cell 511 is wrapped with an insulating blue film, the liquid inlet pipe 63 and the liquid outlet pipe 62 are made of polypropylene plastic, the liquid cooling plate 61 is made of metal cold plate with insulating paint sprayed on the surface, the inner side of the lower housing 1 of the battery pack is made of an insulating protective layer, and the entire interior of the lower housing 1 is filled with glue, which can almost completely avoid creepage.

[0081] The insulating blue film is a thin blue film made of polyethylene terephthalate (PET) as the base material and coated with a special adhesive layer. It is mainly used to wrap the outside of the 511 battery cell to provide insulation protection. The thickness of this insulating blue film is usually between 0.05 and 0.15 mm, and the temperature resistance range is -40℃ to 150℃.

[0082] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application (including the claims) is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of this application as described above, which are not provided in the details for the sake of brevity.

[0083] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery pack, characterized in that, include: The lower housing has a first accommodating space inside, which contains a stack of battery cells. Top cover, used to seal the first receiving space; The upper cover is located on the side of the top cover away from the lower box body, and the upper cover and the top cover together form a second receiving space; An electrical system assembly, located within the second accommodating space, includes an electrical system and / or a battery management system.

2. The battery pack according to claim 1, characterized in that, It also includes a support bracket located between the battery management system and the upper cover.

3. The battery pack according to claim 2, characterized in that, The support bracket includes a support portion and two oppositely arranged connecting portions. One end of each connecting portion is connected to the upper cover, and the other end of each connecting portion is connected to the support portion. There is a gap between the support portion and the upper cover. The battery management system is located on the side of the support portion away from the upper cover.

4. The battery pack according to claim 1, characterized in that, The battery cell stack includes multiple battery cell groups arranged along a first direction, and each battery cell group includes multiple battery cells arranged along a second direction. The first direction intersects with the second direction, and the gaps between two adjacent battery cells, between a battery cell and the lower housing, and between a battery cell and the top cover are all filled with an adhesive layer.

5. The battery pack according to claim 4, characterized in that, The adhesive layer is a foamed polyurethane adhesive layer.

6. The battery pack according to claim 4, characterized in that, It also includes a thermal management system, which includes multiple liquid cooling plates, an inlet pipe and an outlet pipe. The multiple liquid cooling plates are spaced apart along the first direction. At least one of the battery cells is arranged between two adjacent liquid cooling plates. Each liquid cooling plate is provided with an inlet and an outlet. The inlet is connected to the inlet pipe and the outlet is connected to the outlet pipe.

7. The battery pack according to claim 6, characterized in that, The liquid inlet pipe and the liquid outlet pipe are located on the same side of the cell stack, and the liquid inlet is located above the liquid outlet.

8. The battery pack according to claim 6, characterized in that, Each of the liquid cooling plates has a thermally conductive adhesive layer on the side near the battery cell assembly, and the liquid cooling plate and the battery cell assembly are connected through the thermally conductive adhesive layer.

9. The battery pack according to claim 1, characterized in that, The first accommodating space is also provided with a busbar and an output copper busbar located on top of the battery cell stack. The busbar is connected to the battery cell stack, and the output copper busbar is connected to both the busbar and the electrical system.

10. The battery pack according to claim 9, characterized in that, The first accommodating space is also provided with a connecting harness, which is located above the cell stack and is connected to both the busbar and the battery management system.

Images