Battery pack

Abstract

The utility model relates to new energy automobile technical field, more particularly, relate to a kind of battery pack.The battery pack includes shell, multiple rows of battery cell groups and intermediate beam;Each row of battery cell group includes multiple battery cells arranged in sequence;Multiple battery cells are all contained in shell, and are connected with shell;Two rows of battery cell groups between adjacent are provided with intermediate beam;Intermediate beam is contacted with all battery cells of two rows of battery cell groups adjacent;Intermediate beam is connected with shell;Intermediate beam is provided with containing groove for being contacted with the two side walls opposite of battery cell, and each containing groove is used for containing heating wire;Intermediate beam is provided with cooling flow channel, and cooling flow channel is used for cooling liquid to pass;Among them, the extension direction of containing groove and the extension direction of cooling flow channel are all parallel with the arrangement direction of multiple battery cells in each row of battery cell group.The battery pack simple structure can integrate heating system and liquid cooling system together, to improve space utilization.

Description

Technical Field

[0001] This utility model relates to the field of new energy vehicle technology, and more specifically, to a battery pack. Background Technology

[0002] As a key component of electric vehicles, the performance of the power battery pack directly affects the vehicle's power performance, safety performance, and driving range. Under current technological conditions, to ensure the battery pack operates stably within its optimal operating temperature range, thereby improving battery efficiency and extending its lifespan, a temperature regulation system is typically required. Current mainstream temperature regulation solutions mainly include heating systems and liquid cooling systems: the former is primarily used to raise the battery temperature to its normal operating range in low-temperature environments, while the latter is used for effective heat dissipation from the battery pack in high-temperature environments.

[0003] However, existing technologies suffer from complex structures and excessive space requirements for heating and liquid cooling systems. Utility Model Content

[0004] The purpose of this invention is to provide a battery pack with a simple structure that integrates a heating system and a liquid cooling system, thereby improving space utilization.

[0005] The embodiments of this utility model can be implemented as follows: This utility model provides a battery pack, comprising: The enclosure comprises a housing, multiple rows of battery cells, and a central beam; each row of battery cells includes multiple cells arranged sequentially; all cells are housed within the housing and connected to it; a central beam is provided between two adjacent rows of battery cells; the central beam contacts all cells in the two adjacent rows of battery cells; the central beam is connected to the housing. The two opposite sidewalls of the intermediate beam that are in contact with the battery cell are provided with receiving grooves, each of which is used to receive the heating wire; the intermediate beam is provided with cooling channels for the passage of coolant. The extension direction of the receiving groove and the extension direction of the cooling channel are both parallel to the arrangement direction of multiple cells in each row of cells.

[0006] In an optional embodiment, the battery pack further includes an inlet pipe and an outlet pipe, both of which are connected to the housing; The inlet pipe is equipped with an inlet flow channel, and the outlet pipe includes an outlet flow channel. The inlet flow channel and the outlet flow channel are respectively connected to both ends of the cooling flow channel.

[0007] In an optional embodiment, the battery pack further includes an inlet nozzle and an outlet nozzle, which are connected to the same side of the intermediate beam; an inlet pipe is sleeved on the inlet nozzle, and an outlet pipe is sleeved on the outlet nozzle. The inlet nozzle is equipped with an inlet channel, which is connected to the cooling channel and the inlet channel; the outlet nozzle is equipped with an outlet channel, which is connected to the cooling channel and the outlet channel.

[0008] In an optional embodiment, the intermediate beam includes two abutting connecting plates, each connecting plate being provided with a receiving groove; each connecting plate being provided with a first protrusion protruding in a direction away from the other connecting plate; the two first protrusions respectively contact all the cells of a row of cells; In this configuration, the receiving groove on the same connecting plate corresponds to the first protrusion, and the receiving groove is set on the corresponding first protrusion. The concave direction of the receiving groove is opposite to the convex direction of the corresponding first protrusion. When the two connecting plates abut against each other, the two first protrusions cooperate to form a cooling channel.

[0009] In an optional embodiment, each connecting plate includes a first part and a second part that are connected to each other; the first parts of the two connecting plates abut against each other, and each first part is provided with a first protrusion; the two ends of each first part are respectively connected to two opposite side walls of the housing; each second part is connected to the bottom plate of the housing. Each of the second parts is provided with a second protrusion protruding in a direction away from the bottom plate of the housing; the top of each second protrusion abuts against a row of battery cells.

[0010] In an optional implementation, the second protrusion is spaced apart from the first portion.

[0011] In an optional embodiment, the battery pack further includes a plurality of seals, each of which is disposed at the junction of the end of the first portion and the sidewall of the housing.

[0012] In an optional embodiment, each connecting plate is provided with a groove, and the groove on the same connecting plate corresponds to the first protrusion; the groove is provided on the corresponding first protrusion; the concave direction of the groove is opposite to the protruding direction of the corresponding first protrusion; the bottoms of the grooves on the two connecting plates abut against each other.

[0013] In an optional embodiment, the receiving groove includes a first section, a second section, and a third section; the extending directions of the first section and the second section are both parallel to the arrangement direction of the multiple cells in each row of cells; the groove is located between the first section and the second section; the two ends of the third section are respectively connected to the first section and the second section.

[0014] In an optional embodiment, there are multiple grooves, which are arranged at intervals along the arrangement direction of multiple cells in each row of cells.

[0015] The beneficial effects of the battery pack provided in this embodiment of the present invention include: This embodiment incorporates a housing to house and protect the battery cells. It also includes a central beam positioned between adjacent rows of cells to support them. The sidewalls of the central beam have recesses for housing heating wires, allowing the cells to be heated. The central beam also features cooling channels for coolant flow, cooling the cells. Furthermore, the extension directions of the recesses and cooling channels are parallel to the arrangement of the cells within each row, ensuring that the cooling channels and heating wires in the recesses contact all cells in the adjacent rows, guaranteeing that each cell is both heated and cooled. This embodiment integrates the heating and liquid cooling systems by incorporating recesses and cooling channels on the central beam, thereby improving the space utilization of the battery pack. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the battery pack provided in this embodiment; Figure 2 This is a structural schematic diagram of the intermediate beam from a first-view perspective provided in this embodiment; Figure 3 This is a structural schematic diagram of the intermediate beam from a second perspective provided in this embodiment; Figure 4 for Figure 3 Schematic diagram of the cross section at point AA; Figure 5 This is an exploded view of a portion of the battery pack structure provided in this embodiment; Figure 6 This is a partial schematic diagram of the inlet pipe, outlet pipe, inlet nozzle, and outlet nozzle provided in this embodiment; Figure 7 for Figure 1 A magnified view of a section at point B in the middle; Figure 8 for Figure 3 A magnified view of a section at point C.

[0018] Icons: 100-Battery pack; 110-Housing; 120-Cell assembly; 130-Intermediate beam; 131-Connecting plate; 1311-First section; 1312-Second section; 1313-First protrusion; 1314-Second protrusion; 1315-Groove; 140-Inlet pipe; 150-Outlet pipe; 160-Inlet nozzle; 170-Outlet nozzle; 180-Seal; 101-Receiving groove; 1011-First section; 1012-Second section; 1013-Third section; 102-Cooling channel; 103-Inlet channel; 104-Outlet channel; 105-Inlet passage; 106-Outlet passage. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0023] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0024] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0025] Current power battery pack designs typically treat heating and liquid cooling as separate systems. Specifically, heating devices often employ independently configured heating films or heating resistance wires, installed at specific external or internal locations within the battery module; while the liquid cooling system, composed of liquid cooling pipes, a coolant circulation pump, and a radiator, is generally located inside or at the bottom of the battery pack. This independent architecture increases the overall system complexity and occupies a large space, significantly increasing the battery pack's volume and weight, and restricting the effective utilization of internal space. This negatively impacts both the vehicle's lightweight design and optimized space layout.

[0026] Based on the above issues, please refer to Figures 1-4 This utility model provides a battery pack 100, which includes a housing 110, multiple rows of battery cells 120 and a middle beam 130; each row of battery cells 120 includes multiple battery cells arranged in sequence; the multiple battery cells are housed in the housing 110 and connected to the housing 110.

[0027] An intermediate beam 130 is provided between two adjacent rows of battery cell groups 120; the intermediate beam 130 is in contact with all the battery cells of the two adjacent rows of battery cell groups 120; the intermediate beam 130 is connected to the housing 110. It can be understood that the intermediate beam 130 can contact each battery cell, and in this embodiment, the intermediate beam 130 can be provided to support the battery cells, thereby improving structural stability.

[0028] In this embodiment, the two opposite sidewalls of the intermediate beam 130 that are in contact with the battery cells are provided with receiving grooves 101, each of which is used to accommodate a heating wire; the intermediate beam 130 is provided with cooling channels 102 for the passage of coolant. It should be noted that the extending directions of the receiving grooves 101 and the extending directions of the cooling channels 102 are parallel to the arrangement direction of the multiple battery cells in each row of battery cell groups 120.

[0029] Specifically, since the extending directions of the receiving groove 101 and the cooling channel 102 are parallel to the arrangement direction of the multiple cells in each row of cell groups 120, all cells in each row of cell groups 120 can contact the heating wire in the receiving groove 101 and the cooling channel 102, thereby enabling the cells to be heated by the heating wire and cooled by the coolant in the cooling channel 102. Thus, this embodiment integrates the heating system and the liquid cooling system together through the intermediate beam 130, simplifying the structure and reducing the space occupied by the heating and liquid cooling systems in the battery pack 100, thereby improving space utilization and reducing the weight of the battery pack 100.

[0030] Furthermore, in this embodiment, please refer to Figures 1-6The battery pack 100 also includes an inlet pipe 140 and an outlet pipe 150, both of which are connected to the housing 110. The inlet pipe 140 is provided with an inlet channel 103, and the outlet pipe 150 includes an outlet channel 104. The inlet channel 103 and the outlet channel 104 are respectively connected to both ends of the cooling channel 102.

[0031] Understandably, the coolant enters through the inlet channel 103 and then flows through the cooling channel 102. In the cooling channel 102, the coolant exchanges heat with the battery cell to remove heat from the cell. After the heat exchange is complete, the coolant flows out through the outlet channel 104. Therefore, in this embodiment, the inlet pipe 140 and the outlet pipe 150 allow the coolant to flow into and out of the cooling channel 102, thereby cooling the battery cell.

[0032] Based on the above, please refer to... Figures 1-6 The battery pack 100 also includes an inlet nozzle 160 and an outlet nozzle 170, which are connected to the same side of the intermediate beam 130. An inlet pipe 140 is fitted onto the inlet nozzle 160, and an outlet pipe 150 is fitted onto the outlet nozzle 170. The inlet nozzle 160 is provided with an inlet channel 105, which is connected to the cooling channel 102 and the inlet channel 103. The outlet nozzle 170 is provided with an outlet channel 106, which is connected to the cooling channel 102 and the outlet channel 104.

[0033] It should be noted that in this embodiment, the inlet nozzle 160 and outlet nozzle 170 are used for transition. The coolant flows sequentially through the inlet channel 103, the inlet passage 105, the cooling channel 102, the outlet channel 106, and the outlet channel 104. The diameter of the inlet channel 105 is smaller than that of the inlet channel 103, and the diameter of the outlet channel 106 is smaller than that of the outlet channel 104. This allows the inlet nozzle 160 and outlet nozzle 170 to function similarly to throttle valves, regulating the flow rate and pressure of different channels and preventing excessive coolant from entering the cooling channel 102, which could lead to excessive internal pressure in the cooling channel 102.

[0034] Understandably, since the inlet pipe 140 and the outlet pipe 150 are located on the same side of the intermediate beam 130, coolant can flow in and out from one side of the battery pack 100. Therefore, the inlet nozzle 160 and the outlet nozzle 170 are connected to the same side of the intermediate beam 130.

[0035] Further, please refer to Figures 1-4In this embodiment, the intermediate beam 130 includes two abutting connecting plates 131. It can be understood that the intermediate beam 130 in this embodiment has a symmetrical structure. Each connecting plate 131 is provided with a first protrusion 1313 protruding in a direction away from the other connecting plate 131; the two first protrusions 1313 respectively contact a row of battery cell groups 120.

[0036] Specifically, the other parts of the two connecting plates 131 abut against each other, thereby forming an intermediate beam 130 through the connection of the two connecting plates 131 to support the battery cell and improve structural stability. The first protrusion 1313 provides a certain space so that when the two connecting plates 131 abut against each other, the two first protrusions 1313 can jointly form a cooling channel 102 for the flow of coolant.

[0037] Since the intermediate beam 130 is located between two adjacent rows of battery cell groups 120, the first protrusion 1313 on a connecting plate 131 contacts all the battery cells of a row of battery cell groups 120, so that the heat of all the battery cells in the row of battery cell groups 120 can be transferred to the coolant in the cooling channel 102 through the corresponding first protrusion 1313, thereby achieving cooling of the battery cells.

[0038] It should be noted that each connecting plate 131 is provided with a receiving groove 101; the receiving groove 101 is disposed on the first protrusion 1313 on the same connecting plate 131, that is, the receiving groove 101 and the first protrusion 1313 on the same connecting plate 131 correspond to each other, and the receiving groove 101 is disposed on the corresponding first protrusion 1313. The concave direction of the receiving groove 101 is opposite to the protruding direction of the corresponding first protrusion 1313; when the two connecting plates 131 abut against each other, the two first protrusions 1313 cooperate to form a cooling channel 102.

[0039] Understandably, the receiving groove 101 is disposed on the side of the connecting plate 131 near the battery cell, so that the heating wire located in the receiving groove 101 can heat the battery cell that is in contact with the first protrusion 1313. Thus, in this embodiment, the receiving groove 101 is disposed in the first protrusion 1313 to integrate the liquid cooling system and the heating system together, thereby improving the space utilization of the battery pack 100.

[0040] According to the above, each connecting plate 131 includes a first part 1311 and a second part 1312 that are connected to each other; the first parts 1311 of the two connecting plates 131 abut against each other, and each first part 1311 is provided with a first protrusion 1313; the two ends of each first part 1311 are respectively connected to two opposite side walls of the housing 110.

[0041] Understandably, since the first protrusion 1313 is disposed in the first portion 1311, the two first portions 1311 are located between two adjacent rows of battery cells 120 and together form the cooling channel 102. Furthermore, since the receiving groove 101 is disposed at the corresponding first protrusion 1313, the liquid cooling system and the heating system of this embodiment are mainly integrated in the first portion 1311.

[0042] In this embodiment, please refer to Figures 1-7 The battery pack 100 also includes a plurality of seals 180, each of which is disposed at the connection between the end of the first part 1311 and the side wall of the housing 110, thereby preventing the coolant in the cooling channel 102 from flowing out from the connection between the two, preventing coolant leakage, and preventing damage to other structures inside the battery pack 100 or short circuits caused by coolant leakage.

[0043] In this embodiment, there are two seals 180. In other embodiments, the number of seals 180 can be adjusted according to the actual situation.

[0044] Specifically, each second part 1312 is connected to the bottom plate of the housing 110, wherein each second part 1312 is provided with a second protrusion 1314 protruding in a direction away from the bottom plate of the housing 110; the top of each second protrusion 1314 abuts against a row of battery cells 120.

[0045] The second part 1312 is located between the bottom plate of the housing 110 and the battery cell. The first part 1311 and the second part 1312 are connected together so that the cross-section of the connecting plate 131 is L-shaped. The first part 1311 abuts against the side of the battery cell, while the second part 1312 abuts against the bottom of the battery cell.

[0046] In this embodiment, a second protrusion 1314 is provided to abut against the battery cell, so that the battery cell is lifted by the second protrusion 1314, thereby spacing the battery cell and the bottom plate of the housing 110 apart and providing bottom heat dissipation space.

[0047] It should be noted that in this embodiment, the second protrusion 1314 and the first part 1311 are spaced apart, so that after the battery cell and the connecting plate 131 abut together, the spaced area between the second protrusion 1314 and the first part 1311 is enclosed to form a cavity, thereby improving structural stability.

[0048] Furthermore, in this embodiment, in order to improve the connection stability between the two connecting plates 131, each connecting plate 131 is provided with a groove 1315. The groove 1315 is provided on the first protrusion 1313 on the same connecting plate 131, that is, the groove 1315 and the first protrusion 1313 on the same connecting plate 131 correspond to each other, and the groove 1315 is provided on the corresponding first protrusion 1313.

[0049] Since the recessed direction of the groove 1315 is opposite to the protruding direction of the first protrusion 1313, that is, the groove 1315 is recessed towards the other connecting plate 131; therefore, when the two connecting plates 131 abut together, the bottom of the groove 1315 on the two connecting plates 131 can abut against each other, thereby increasing the connection area between the two connecting plates 131 and thus improving the connection stability.

[0050] Specifically, in this embodiment, there are multiple grooves 1315. The multiple grooves 1315 are arranged sequentially and at intervals along the arrangement direction of multiple cells in each row of cell groups 120, thereby increasing the connection area of ​​the two connecting plates 131 while ensuring that the coolant can flow normally in the cooling channel 102.

[0051] Based on the above, please refer to... Figures 1-8 In this embodiment, the receiving groove 101 includes a first segment 1011, a second segment 1012, and a third segment 1013; the extending direction of the first segment 1011 and the extending direction of the second segment 1012 are both parallel to the arrangement direction of the multiple cells in each row of cell groups 120; the groove 1315 is located between the first segment 1011 and the second segment 1012; the two ends of the third segment 1013 are respectively connected to the first segment 1011 and the second segment 1012.

[0052] Understandably, the heat dissipation rate at the edge of the battery cell is greater than that at the center, therefore the temperature at the edge of the battery cell is lower than that at the center. In this embodiment, the third segment 1013 is bent, so that the receiving groove 101 can surround the recess 1315, and the opening of the receiving groove 101 is directly opposite the edge of the battery cell, so that the heating wire in the receiving groove 101 is directly opposite the edge of the battery cell, thereby heating the edge of the battery cell and ensuring the temperature uniformity of various positions of the battery cell.

[0053] In other embodiments, each connecting plate 131 is provided with two receiving slots 101; a groove 1315 is located between the two receiving slots 101, and each receiving slot 101 respectively accommodates a heating wire, and the two heating wires respectively heat the upper and lower edges of the battery cell.

[0054] In summary, this embodiment uses a housing 110 to house and protect the battery cells. It also includes a central beam 130, which is placed between two adjacent rows of battery cell groups 120 to support the cells. The sidewall of the central beam 130 has a receiving groove 101 for accommodating heating wires, allowing the battery cells to be heated. The central beam 130 also has a cooling channel 102 for coolant flow, cooling the battery cells. Furthermore, the extending directions of the receiving groove 101 and the cooling channel 102 are parallel to the arrangement direction of the multiple battery cells within each row of battery cell groups 120, ensuring that the cooling channel 102 and the heating wires in the receiving groove 101 can contact all the battery cells in the two adjacent rows of battery cell groups 120, guaranteeing that each battery cell can be heated and cooled. In this embodiment, by providing a receiving groove 101 and a cooling channel 102 on the intermediate beam 130, the heating system and the liquid cooling system are integrated together, thereby improving the space utilization of the battery pack 100.

[0055] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A battery pack, characterized in that, include: The enclosure comprises a housing (110), multiple rows of battery cells (120), and a central beam (130); each row of battery cells (120) includes multiple sequentially arranged battery cells; each of the multiple battery cells is housed within the housing (110) and connected to the housing (110); a central beam (130) is provided between two adjacent rows of battery cells (120); the central beam (130) contacts all the battery cells of the two adjacent rows of battery cells (120); the central beam (130) is connected to the housing (110); The intermediate beam (130) has two opposite sidewalls that are in contact with the battery cell, each of which is provided with a receiving groove (101) for accommodating a heating wire; the intermediate beam (130) is provided with a cooling channel (102) for passing coolant. The extension direction of the receiving groove (101) and the extension direction of the cooling channel (102) are both parallel to the arrangement direction of the multiple cells in each row of the cell group (120).

2. The battery pack according to claim 1, characterized in that, The battery pack (100) also includes an inlet pipe (140) and an outlet pipe (150), both of which are connected to the housing (110). The inlet pipe (140) is provided with an inlet channel (103), and the outlet pipe (150) includes an outlet channel (104). The inlet channel (103) and the outlet channel (104) are respectively connected to both ends of the cooling channel (102).

3. The battery pack according to claim 2, characterized in that, The battery pack (100) also includes an inlet nozzle (160) and an outlet nozzle (170), the inlet nozzle (160) and the outlet nozzle (170) being connected to the same side of the intermediate beam (130); the inlet pipe (140) is sleeved on the inlet nozzle (160), and the outlet pipe (150) is sleeved on the outlet nozzle (170). The inlet nozzle (160) is provided with an inlet channel (105), which is connected to the cooling channel (102) and the inlet channel (103); the outlet nozzle (170) is provided with an outlet channel (106), which is connected to the cooling channel (102) and the outlet channel (104).

4. The battery pack according to claim 2, characterized in that, The intermediate beam (130) includes two abutting connecting plates (131), each of the connecting plates (131) being provided with the receiving groove (101); each of the connecting plates (131) is provided with a first protrusion (1313) protruding in a direction away from the other connecting plate (131); the two first protrusions (1313) respectively contact all the cells of a row of the cell packs (120); Wherein, the receiving groove (101) on the same connecting plate (131) corresponds to the first protrusion (1313), the receiving groove (101) is disposed on the corresponding first protrusion (1313), and the concave direction of the receiving groove (101) is opposite to the protruding direction of the corresponding first protrusion (1313); when the two connecting plates (131) abut against each other, the two first protrusions (1313) cooperate to form the cooling channel (102).

5. The battery pack according to claim 4, characterized in that, Each of the connecting plates (131) includes a first part (1311) and a second part (1312) that are connected to each other; the first parts (1311) of the two connecting plates (131) abut against each other, and each first part (1311) is provided with a first protrusion (1313); the two ends of each first part (1311) are respectively connected to two opposite side walls of the housing (110); each second part (1312) is connected to the bottom plate of the housing (110); Each of the second portions (1312) is provided with a second protrusion (1314) protruding in a direction away from the bottom plate of the housing (110); the top of each second protrusion (1314) abuts against a row of the battery cells (120).

6. The battery pack according to claim 5, characterized in that, The second protrusion (1314) is spaced apart from the first portion (1311).

7. The battery pack according to claim 5, characterized in that, The battery pack (100) also includes a plurality of seals (180), each of which is disposed at the junction of the end of the first portion (1311) and the side wall of the housing (110).

8. The battery pack according to claim 4, characterized in that, Each of the connecting plates (131) is provided with a groove (1315), and the groove (1315) on the same connecting plate (131) corresponds to the first protrusion (1313); the groove (1315) is provided on the corresponding first protrusion (1313); the concave direction of the groove (1315) is opposite to the protruding direction of the corresponding first protrusion (1313); the bottoms of the grooves (1315) on the two connecting plates (131) abut against each other.

9. The battery pack according to claim 8, characterized in that, The receiving groove (101) includes a first section (1011), a second section (1012), and a third section (1013); the extension direction of the first section (1011) and the extension direction of the second section (1012) are both parallel to the arrangement direction of the plurality of cells in each row of the cell group (120); the groove (1315) is located between the first section (1011) and the second section (1012); the two ends of the third section (1013) are respectively connected to the first section (1011) and the second section (1012).

10. The battery pack according to claim 8, characterized in that, The number of grooves (1315) is multiple, and the multiple grooves (1315) are arranged sequentially at intervals along the arrangement direction of the multiple cells in each row of the cell group (120).

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