Battery pack

Abstract

The invention provides a battery pack which comprises a battery pack shell and a battery cell group, the battery pack shell is provided with a containing cavity, the containing cavity is constructed to contain the battery cell group and comprises a first shell, and the first shell is opened towards a first direction; the first shell comprises a first shell part and a second shell part which are connected with each other, and the first shell part and the second shell part are arranged in the second direction; in the third direction, the size of the first shell part is larger than that of the second shell part, and the gap between the battery cell group and the first shell part is larger than that between the battery cell group and the second shell part; wherein included angles are formed between every two of the first direction, the second direction and the third direction. The battery pack disclosed by the invention is relatively good in impact resistance.

Description

Technical Field

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

[0002] Due to their high energy density, lightweight, and high shape flexibility, pouch cells have become the core power source for portable electronic devices, power tools, drones, electric bicycles, and other small power devices. However, during long-term use, pouch cells, due to their lower mechanical strength, are prone to deformation, leakage, or even short circuits caused by external impacts, vibrations, or compression, posing serious safety hazards.

[0003] Current protection solutions for pouch cells primarily rely on rigid casings. For example, some solutions use plastic or metal casings to encase the cells. These solutions have the following drawbacks: First, the standardized rectangular casing is difficult to adapt to irregularly shaped battery compartments, leading to wasted installation space or reduced battery pack capacity. Second, the casing is prone to stress concentration upon drop, with the impact force directly transmitted to the cell, potentially causing cell displacement or damage. Summary of the Invention

[0004] Based on this, this application provides a battery pack to address the shortcomings of related technologies.

[0005] This application provides a battery pack, including a battery pack housing and a battery cell assembly. The battery pack housing has a receiving cavity configured to accommodate the battery cell assembly. The receiving cavity includes a first housing, which is open in a first direction.

[0006] The first housing includes a first housing portion and a second housing portion connected to each other, the first housing portion and the second housing portion being disposed along a second direction;

[0007] In the third direction, the size of the first housing part is larger than the size of the second housing part, and the gap between the battery cell assembly and the first housing part is larger than the gap between the battery cell assembly and the second housing part.

[0008] The first direction, the second direction, and the third direction are set at angles to each other.

[0009] In one possible implementation, the first housing portion includes a first housing wall located on at least one side of the receiving cavity in a third direction;

[0010] The first shell wall includes an interconnected shell wall body and a buffer structure. The shell wall body has a clearance portion, and the buffer structure is located in the clearance portion. The buffer structure is configured to move relative to the shell wall body in a third direction.

[0011] In one possible implementation, the buffer structure includes a connecting part and a buffer part, with one end of the connecting part along its extension direction connected to the shell wall body and the other end of the connecting part along its extension direction connected to the buffer part.

[0012] In one possible implementation, the connecting portion extends along the second direction, and the buffer portion is located at the end of the connecting portion away from the second housing portion;

[0013] And / or, the buffer section has multiple buffer protrusions on the outside away from the receiving cavity;

[0014] And / or, the clearance part is a through hole, the through hole penetrates the shell wall body on both sides in a third direction, and the buffer structure and the edge of the through hole have a first gap, the first gap being greater than or equal to 1 mm and less than or equal to 5 mm;

[0015] And / or, the battery cell assembly includes at least two battery cells, the thickness direction of the battery cells is along a first direction, the at least two battery cells are stacked along the first direction, and a buffer structure is provided on opposite sides of the battery cell assembly along a third direction.

[0016] In one possible implementation, the first housing portion further includes a second housing wall, the first housing wall being connected to at least one side of the second housing wall in a third direction, the second housing wall having a curved surface construction and protruding outward toward the receiving cavity.

[0017] In one possible implementation, the inner wall of the second shell wall along the second direction is provided with a first rib, the first rib extends along the first direction, and a plurality of first ribs are arranged along the third direction. The protrusion height of the first rib on the side near the opening of the first shell part is greater than the protrusion height of the first rib on the side away from the opening of the first shell part.

[0018] And / or, the first housing portion further includes a third housing wall located on one side of the receiving cavity along the first direction, the third housing wall being adjacent to one side of the second housing wall along the second direction; the second housing portion includes a fourth housing wall adjacent to the third housing wall, both the third and fourth housing walls being provided with second ribs, the second ribs extending along at least one of the second and third directions.

[0019] In one possible implementation, the battery pack further includes a protection board assembly housed in a receiving cavity, the protection board assembly being connected to one side of the cell assembly along a second direction, and the protection board assembly being located between the cell assembly and the second housing portion.

[0020] In one possible implementation, the second housing portion further includes a fifth housing wall located on one side of the receiving cavity along the second direction.

[0021] At least part of the fifth shell wall is recessed towards the inside of the receiving cavity;

[0022] And / or, the inner wall of the fifth shell is provided with a limiting part, the protective plate assembly includes a circuit board, the thickness direction of the circuit board is along the second direction, and the two sides of the circuit board along the third direction are inserted into the limiting part.

[0023] In one possible implementation, the battery pack also includes a protective element disposed between the cell assembly and the battery pack housing;

[0024] The protective component includes a first protective component, which is located on at least one side of the battery cell assembly along a first direction;

[0025] And / or, the protective element includes a second protective element located on one side of the cell assembly along the second direction, and the second protective element is located between the first housing portion and the cell assembly;

[0026] And / or, the protective element includes a third protective element located on at least one side of the cell assembly along a third direction.

[0027] In one possible implementation, the first protective component includes an adhesive portion, a first protective portion, and a second protective portion. The battery pack housing also includes a second housing, which is open in a first direction. The first housing has a first inner cavity, and the second housing has a second inner cavity. The first and second inner cavities together constitute a receiving cavity.

[0028] Both the adhesive portion and the first protective portion are disposed between the second housing and the battery cell assembly. The adhesive portion and the first protective portion are disposed along the second direction. The adhesive portion connects the second housing and the battery cell assembly, and the second protective portion is disposed between the first housing and the battery cell assembly.

[0029] The thickness of the second protective component is greater than or equal to 1 mm;

[0030] The third protective component includes two third protective parts, which are respectively located on both sides of the cell assembly along the third direction.

[0031] The battery pack provided in this application embodiment includes a first outer shell with an opening on one side along a first direction to facilitate the assembly of battery cells into the first outer shell. The first outer shell includes a first housing portion and a second housing portion. Since the first housing portion and the second housing portion are arranged along a second direction, and in a third direction, the size of the first housing portion is larger than the size of the second housing portion, this allows the first outer shell to form a shape that is wider on one side and narrower on the other, which is beneficial for forming an irregularly shaped first outer shell, and thus an irregularly shaped battery pack outer shell. This facilitates the battery pack's adaptation to irregularly shaped battery compartments and improves the space utilization of the battery compartment. When the battery cell assembly is housed in the receiving cavity of the battery pack outer shell, since the gap between the battery cell assembly and the first housing portion is larger than the gap between the battery cell assembly and the second housing portion, there is a larger space between the battery cell assembly and the first housing portion. Therefore, when the first housing portion deforms during a drop, it can prevent the first housing portion from contacting the battery cell assembly, which could lead to damage and leakage of the battery cell assembly, thereby improving the overall drop resistance of the battery pack. In addition, since the size of the first housing part is larger than that of the second housing part, and the gap between the battery cell assembly and the first housing part is larger, a buffer shock absorption cavity can be formed at the first housing part when it is dropped, thereby improving the impact resistance of the battery pack.

[0032] In addition to the technical problems solved by the embodiments of this application, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions described above, other technical problems that the battery pack provided by this application can solve, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further explained in detail in the specific embodiments. Attached Figure Description

[0033] 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 some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the battery pack structure provided in an embodiment of this application;

[0035] Figure 2 This is a schematic diagram of the structure of the first outer casing and the battery cell assembly in the battery pack provided in the embodiments of this application;

[0036] Figure 3 This is a schematic diagram of the structure of the first outer casing in the battery pack provided in the embodiments of this application;

[0037] Figure 4 for Figure 3 A structural diagram from another angle;

[0038] Figure 5 for Figure 4 The main view;

[0039] Figure 6 for Figure 4 Top view;

[0040] Figure 7 for Figure 4 A bottom view;

[0041] Figure 8 for Figure 3 A structural diagram from another angle;

[0042] Figure 9 This is a schematic diagram of the structure of the second outer casing and the battery cell assembly in the battery pack provided in the embodiments of this application;

[0043] Figure 10 for Figure 9 Top view;

[0044] Figure 11 This is a schematic diagram of the structure of the second outer casing in the battery pack provided in the embodiments of this application;

[0045] Figure 12 for Figure 5 A magnified view of a section at point A in the middle;

[0046] Figure 13 for Figure 2 Top view;

[0047] Figure 14 This is a schematic diagram of the structure of the second outer shell and the adhesive part in the battery pack provided in the embodiment of this application.

[0048] Explanation of reference numerals in the attached figures:

[0049] 10-Battery pack outer casing; 100-First outer casing; 110-First housing portion; 111-First housing wall; 1111-Housing wall body; 11111-Allowing portion; 1112-Buffer structure; 11121-Connecting portion; 11122-Buffer portion; 112-Second housing wall; 1121-First sub-housing wall; 11211-First rib; 1122-Second sub-housing wall; 113-Third housing wall; 120-Second housing portion; 121-Fourth housing wall; 1211-Second rib; 122-Fifth housing wall; 1221-Limiting portion; 123-Sixth housing wall; 200-Second outer casing; 210-Third housing portion; 220-Fourth housing portion;

[0050] 20 - Cell assembly; 20a - Cell; 20b - Bundling component; 20c - Buffer component;

[0051] 30 - Protective component; 30a - First protective component; 301a - Adhesive part; 302a - First protective part; 303a - Second protective part; 30b - Second protective component; 30c - Third protective component; 301c - Third protective part;

[0052] 40 - Protection board assembly. Detailed Implementation

[0053] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0054] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an indirect connection through an intermediate medium, or the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0055] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the accompanying drawings, and are only for the convenience of describing this application 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 application.

[0056] The terms "first," "second," and "third" (if any) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a particular order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein.

[0057] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such that a process, method, system, product, or display that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or display.

[0058] As described in the background art, pouch cells used in small power equipment are susceptible to vibration and shock, which can easily lead to damage to the pouch cells. In view of these problems, embodiments of this application provide a battery pack. The battery pack has a battery pack shell for housing and protecting the cell assembly, thereby buffering the vibration and shock received by the battery pack and improving the protection effect of the battery pack.

[0059] The specific implementation of the battery pack provided in this application will be described in detail below with reference to the accompanying drawings.

[0060] Reference Figures 1 to 8 As shown, the battery pack provided in this application may include a battery pack housing 10 and a cell assembly 20. The battery pack housing 10 has a receiving cavity configured to accommodate the cell assembly 20. The battery pack housing 10 includes a first housing 100, which is open in a first direction. The first housing 100 includes a first housing portion 110 and a second housing portion 120 connected to each other, which are disposed along a second direction. In a third direction, the size of the first housing portion 110 is larger than the size of the second housing portion 120, and the gap between the cell assembly 20 and the first housing portion 110 is larger than the gap between the cell assembly 20 and the second housing portion 120.

[0061] In this configuration, the first direction, the second direction, and the third direction are set at angles to each other. For example, the first direction, the second direction, and the third direction are perpendicular to each other. The first direction can be the X direction in the attached drawing and the opposite direction of the X direction. The second direction can be the Y direction in the attached drawing and the opposite direction of the Y direction. The third direction can be the Z direction in the attached drawing and the opposite direction of the Z direction.

[0062] It is understood that the battery pack shell 10 in this application embodiment has a thin-walled cavity structure. The first shell 100 can be injection molded from plastic material. That is, the first shell part 110 and the second shell can be integrally molded, which facilitates the processing of the first shell 100 and helps to improve the structural strength of the first shell 100.

[0063] The battery pack provided in this application embodiment includes a battery pack shell 10 comprising a first shell 100. The first shell 100 has an opening on one side along a first direction to facilitate the insertion of the battery cell assembly 20 into the first shell 100. The first shell 100 includes a first shell portion 110 and a second shell portion 120. Since the first shell portion 110 and the second shell portion 120 are arranged along a second direction, and in a third direction, the size of the first shell portion 110 is larger than the size of the second shell portion 120, this allows the first shell 100 to form a shape that is wide on one side and narrow on the other side, which is conducive to forming an irregularly shaped first shell 100, and thus forming an irregularly shaped battery pack shell 10. This is beneficial for the battery pack shell 10 to adapt to irregularly shaped battery compartments and improve the space utilization of the battery compartment. After the battery cell assembly 20 is housed in the receiving cavity of the battery pack outer casing 10, the gap between the battery cell assembly and the first housing portion 110 is larger than the gap between the battery cell assembly and the second housing portion 120. This results in a larger space between the battery cell assembly and the first housing portion 110. Therefore, when the first housing portion 110 deforms during a drop, it can prevent the first housing portion 110 from contacting the battery cell assembly, which could lead to damage and leakage of the battery cell assembly, thereby improving the overall drop resistance of the battery pack. In addition, since the size of the first housing portion 110 is larger than that of the second housing portion 120, and the gap between the battery cell assembly and the first housing portion 110 is larger, a buffer shock-absorbing cavity can be formed at the first housing portion during a drop, improving the impact resistance of the battery pack.

[0064] Reference Figure 1 , Figures 9 to 11 As shown, it should be noted that the battery pack housing 10 may also include a second housing 200. The first housing 100 is opened in a first direction, and the second housing 200 is also opened in a first direction. The opening directions of the first housing 100 and the second housing 200 are opposite. The first housing 100 has a first inner cavity, and the second housing 200 has a second inner cavity. The first inner cavity and the second inner cavity together constitute a receiving cavity.

[0065] The battery cell assembly 20 may include battery cells 20a, a binding member 20b, and a buffer member 20c. Multiple battery cells 20a may be stacked along a first direction. The buffer member 20c may be disposed between two adjacent battery cells 20a to improve the impact resistance of the battery cell assembly 20 and provide expansion space. A heat dissipation channel may be defined between two adjacent battery cells 20a and the buffer member 20c to improve the heat dissipation effect of the battery cells 20a. The binding member 20b can fix multiple battery cells 20a into a whole, thereby facilitating the overall installation of the battery cell assembly 20 into the battery pack housing 10.

[0066] When assembling the battery pack, the first outer shell 100 is used as the mounting reference. The depth of the first inner cavity is greater than the depth of the second inner cavity. The battery cell assembly 20 is installed into the first inner cavity, and then the second outer shell 200 is connected to the first outer shell 100, thereby connecting the first outer shell 100 and the second outer shell 200 to form the battery pack outer shell 10, which in turn forms a receiving cavity. Alternatively, the assembly order can be reversed, and this embodiment does not limit this.

[0067] For example, a first snap-fit ​​portion may be provided on the opening side of the first housing 100, and a second snap-fit ​​portion may be provided on the opening side of the second housing 200. The first snap-fit ​​portion and the second snap-fit ​​portion snap-fit ​​together so that the first housing 100 and the second housing 200 are connected together.

[0068] Reference Figure 2 and Figure 11 As shown, in a specific implementation, the second housing 200 may include a third housing portion 210 and a fourth housing portion 220 disposed along the second direction. The third housing portion 210 and the fourth housing portion 220 are integrally formed. In the third direction, the size of the third housing portion 210 is larger than the size of the fourth housing portion 220. The third housing portion 210 is correspondingly connected to the first housing portion 110, and the fourth housing portion 220 is correspondingly connected to the second housing portion 120. This results in the first housing 100 and the second housing 200 being connected to form the battery pack housing 10. In the second direction, one side of the battery pack housing 10 is wider and the other side is narrower, and the wider side has higher impact resistance.

[0069] Reference Figures 3 to 8 As shown, in some embodiments, the first housing portion 110 includes a first housing wall 111, which is located on at least one side of the receiving cavity in a third direction.

[0070] The first shell wall 111 includes a shell wall body 1111 and a buffer structure 1112 connected to each other. The shell wall body 1111 has a clearance portion 11111, and the buffer structure 1112 is disposed in the clearance portion 11111. The buffer structure 1112 is configured to move relative to the shell wall body 1111 in a third direction.

[0071] For example, the first shell wall 111 can be provided on opposite sides of the receiving cavity along the third direction. Each first shell wall 111 is provided with a buffer structure 1112. Since the battery cells 20a are stacked along the first direction, the two sides of the battery cells 20a along the third direction are the weak points of the battery cells 20a, which are more likely to be damaged when subjected to impact.

[0072] Therefore, in this embodiment, by providing buffer structures 1112 on the opposite sides of the first housing portion 110 along the third direction, the impact resistance of the opposite sides of the first housing portion 110 along the third direction can be effectively improved, thereby effectively reducing the vibration impact on the sides of the battery cell 20a along the third direction, which is beneficial to improving the protection effect of the battery pack shell 10 on the battery cell group 20.

[0073] In practical implementation, when the buffer structure 1112 is subjected to external force, it can move 0.5 mm to 3 mm relative to the shell wall body 1111 towards the receiving cavity, or move away from the receiving cavity, so that the buffer structure 1112 can absorb vibration energy, thereby reducing the transmission of vibration to the battery cell assembly 20, and thus preventing the battery cell assembly 20 from being damaged by vibration impact.

[0074] Reference Figure 12 As shown, in some embodiments, the buffer structure 1112 includes a connecting portion 11121 and a buffer portion 11122. One end of the connecting portion 11121 along its extension direction is connected to the shell body 1111, and the other end of the connecting portion 11121 along its extension direction is connected to the buffer portion 11122.

[0075] In other words, one end of the connecting part 11121 is fixed to the shell body 1111, and the buffer part 11122 is fixed to the other end of the connecting part 11121. The connecting part 11121 constitutes the fixed end of the buffer structure 1112, and the buffer part 11122 constitutes the free end of the buffer structure 1112. When the first shell part 110 is impacted by external force on both sides along the third direction, the buffer structure 1112 moves, thereby consuming the impact energy and preventing the external force from continuing to be transmitted to the cell assembly 20, thereby effectively improving the protective effect of the battery pack shell 10.

[0076] In some embodiments, the connecting portion 11121 extends along the second direction, and the buffer portion 11122 is located at the end of the connecting portion 11121 away from the second housing portion 120.

[0077] It is understandable that when the battery pack is dropped, the side of the first housing portion 110 that is away from the second housing portion 120 is the contact point when the battery pack falls. The side of the first housing wall 111 that is away from the second housing portion 120 receives a greater impact force. Therefore, setting the buffer portion 11122 away from the second housing portion 120 is beneficial to improving the impact resistance of the side of the first housing wall 111 that is away from the second housing portion 120.

[0078] In some embodiments, the buffer portion 11122 is provided with a plurality of buffer protrusions on the outer side away from the receiving cavity. For example, the buffer protrusions may be made of flexible materials such as silicone rubber or natural rubber, which is beneficial to improving the buffering performance of the buffer structure 1112, thereby improving the protective performance of the battery pack shell 10.

[0079] In some embodiments, the buffer protrusion and the buffer portion 11122 are integrally formed.

[0080] Reference Figure 12 As shown, in some embodiments, the avoidance portion 11111 is a through hole, which penetrates the shell wall body 1111 on both opposite sides along a third direction. The buffer structure 1112 and the edge of the through hole have a first gap T, which is greater than or equal to 1 mm and less than or equal to 5 mm.

[0081] Thus, the first gap T between the buffer structure 1112 and the through hole is between 1mm and 5mm. This can prevent the first gap from being too small so that the shell body 1111 will not hinder the movement of the buffer structure 1112. The through hole can provide movement space for the buffer structure 1112, which is conducive to the buffer structure 1112 absorbing vibration and impact energy. It can also prevent the first gap from being too large, which would expose the cell assembly 20, thereby improving the sealing performance of the battery pack shell 10.

[0082] In some embodiments, the battery cell assembly 20 includes at least two battery cells 20a, the thickness direction of which is along a first direction. The at least two battery cells 20a are stacked along the first direction, and a buffer structure 1112 is disposed on opposite sides of the battery cell assembly 20 along a third direction. This arrangement is beneficial for improving the protection of weak parts of the battery cell assembly 20 through the buffer structure 1112, thereby improving the impact resistance of the battery cell assembly 20.

[0083] Reference Figures 3 to 8 As shown, in one possible implementation, the first housing portion 110 further includes a second housing wall 112, the first housing wall 111 being connected to at least one side of the second housing wall 112 along a third direction, the second housing wall 112 having a curved surface structure, and the second housing wall 112 protruding outward toward the receiving cavity.

[0084] In a specific implementation, the second shell wall 112 may include a first sub-shell wall 1121 and a second sub-shell wall 1122. The first sub-shell wall 1121 is located on one side of the receiving cavity along the second direction. The first sub-shell wall 1121 is located on the side of the first shell portion 110 away from the second shell portion 120. The second sub-shell wall 1122 is located on one side of the receiving cavity along the first direction.

[0085] This allows the portion of the first housing portion 110 facing away from the second housing wall 112 to have a curved surface. Since the battery pack outer casing 10 has a thinner wall thickness, compared to a planar structure, the curved surface can absorb and dissipate vibration energy under impact through greater elastic deformation, plastic deformation, and surface vibration, resulting in greater total energy absorption. Therefore, the curved second housing wall 112 has better impact resistance, which in turn improves the impact resistance of the first housing portion 110. Furthermore, the convex second housing wall 112 increases the gap between the first housing portion 110 and the cell assembly 20, which facilitates the placement of a thicker protective member 30 between the first housing portion 110 and the cell assembly 20.

[0086] Reference Figure 3 As shown, in some embodiments, the first sub-shell wall 1121 is provided with first ribs 11211, which extend along a first direction. Multiple first ribs 11211 are arranged along a third direction. The first ribs 11211 protrude along a second direction, and the protrusion height of the first rib 11211 on the side near the opening of the first shell portion 110 is greater than the protrusion height of the first rib 11211 on the side away from the opening of the first shell portion 110. For example, in the first direction, the protrusion height of the first rib 11211 can vary continuously or in a stepped manner.

[0087] Thus, the first rib 11211 can improve the overall strength and deformation resistance of the first sub-shell wall 1121. Furthermore, when the protective component 30 is provided between the battery cell assembly 20 and the first sub-shell wall 1121, the first rib 11211 and the protective component 30 work together to effectively reduce external impact and prevent the first sub-shell wall 1121 from making hard contact with the battery cell assembly 20, thereby improving the protection effect on the battery cell assembly 20.

[0088] The width of the first rib 11211 is greater than or equal to 0.3 mm, and the protrusion height of the first rib 11211 is greater than or equal to 0.2 mm.

[0089] Reference Figure 6 As shown, in some embodiments, the first housing portion 110 further includes a third housing wall 113 located on one side of the receiving cavity along a first direction, and the third housing wall 113 is adjacent to the side of the second sub-housing wall 1122 along a second direction. The second housing portion 120 includes a fourth housing wall 121 adjacent to the third housing wall 113, and both the third housing wall 113 and the fourth housing wall 121 are provided with second ribs 1211, the second ribs 1211 extending along at least one of the second direction and the third direction.

[0090] For example, multiple second ribs 1211 extend along a second direction and multiple second ribs 1211 extend along a third direction, thereby making the second ribs 1211 form a grid, which can improve the structural strength and deformation resistance of the shell wall of the first shell 100 away from the opening side, thereby helping to improve the impact resistance of the first shell 100.

[0091] Reference Figure 2 As shown, in one possible implementation, the battery pack further includes a protection board assembly 40, which is housed in a receiving cavity and connected to one side of the cell assembly 20 along the second direction. The protection board assembly 40 is located on the side of the second housing portion 120 opposite to the first housing portion 110.

[0092] Understandably, the protection board assembly 40 can monitor the status of the cell pack 20 in real time and prevent dangerous situations from occurring in the battery pack by cutting off the circuit. The cell 20a may include a tab, which is located on one side of the cell 20a along the second direction. The protection board assembly 40 can be connected to the tab to obtain parameters such as current and voltage of the cell 20a, thereby managing the status of the cell 20a.

[0093] Since the side of the first housing portion 110 away from the second housing portion 120 is susceptible to vibration and impact, the protective plate assembly 40 is disposed on the side of the second housing portion 120 away from the first housing portion 110, so as to be far away from the first housing portion 110. This can reduce the vibration and impact on the protective plate assembly 40 and thus improve the protective effect on the protective plate assembly 40.

[0094] Reference Figures 3 to 5 As shown, in one possible implementation, the second housing portion 120 further includes a fifth housing wall 122, which is located on one side of the receiving cavity along the second direction. At least a portion of the fifth housing wall 122 is curved and recessed toward the inside of the receiving cavity.

[0095] Since the fifth shell wall 122 is correspondingly arranged with the protection plate assembly 40, the curved fifth shell wall 122 has better impact resistance, thereby improving the protection effect on the protection plate assembly 40. In addition, the concave fifth shell wall 122 can fill the excess space in the accommodating cavity that is not occupied by the cell group 20, thereby reducing the size of the battery pack.

[0096] Reference Figure 4As shown, in some embodiments, the inner wall of the fifth shell wall 122 is provided with a limiting portion 1221. The protective plate assembly 40 includes a circuit board with its thickness direction along the second direction. The two sides of the circuit board along the third direction are inserted into the limiting portion 1221. The limiting portion 1221 can be a U-shaped groove that matches the thickness of the circuit board. In this way, the circuit board can be fixed on the limiting portion 1221, thereby preventing the circuit board from moving relative to the battery pack shell 10 when the battery pack is dropped or vibrated.

[0097] Reference Figure 4 As shown, in some embodiments, the second housing portion 120 further includes a sixth housing wall 123, which is located on opposite sides of the receiving cavity along a third direction. The sixth housing wall 123 is connected to the fifth housing wall 122 and the first housing wall 111 on both sides along the second direction.

[0098] Reference Figure 1 As shown, in one possible implementation, the battery pack further includes a protective member 30, which is disposed between the cell assembly 20 and the battery pack housing 10. Thus, by providing the protective member 30 between the cell assembly 20 and the battery pack housing 10, the various sides of the cell assembly 20 can be effectively protected, thereby reducing the vibration and impact forces transmitted to the cell assembly 20 and preventing damage to the cell assembly 20.

[0099] Reference Figure 1 , Figure 13 and Figure 14 As shown, in some embodiments, the protective member 30 includes a first protective member 30a, which is located on at least one side of the cell assembly 20 along a first direction.

[0100] The first protective component 30a includes an adhesive portion 301a, a first protective portion 302a, and a second protective portion 303a. The adhesive portion 301a and the first protective portion 302a are both disposed between the second housing 200 and the battery cell assembly 20. The adhesive portion 301a and the first protective portion 302a are disposed along the second direction, and the first protective portion 302a is disposed close to the first housing portion 110. The adhesive portion 301a connects the second housing 200 and the battery cell assembly 20, and the second protective portion 303a is disposed between the first housing 100 and the battery cell assembly 20.

[0101] In this way, after the cell assembly 20 is bonded to the second housing 200 by the adhesive part 301a, relative displacement between the cell assembly 20 and the second housing 200 is prevented when the battery pack is impacted. Preferably, the surface of the second housing 200 bonded by the adhesive part 301a is flat. Through the adhesive action of the adhesive part 301a, the cell assembly 20 can stick tightly to the second housing 200 when the battery pack is dropped, and will not move around, thus avoiding damage to the cell assembly 20.

[0102] The first protective part 302a, located between the second outer shell 200 and the cell assembly 20 and close to the first outer shell 110, can effectively alleviate the vibration and impact on the cell assembly 20. The second protective part 303a covers the side of the cell 20a that is away from the first protective part 302a. The first protective part 302a and the second protective part 303a work together to provide comprehensive protection for both sides of the cell assembly 20 along the first direction.

[0103] For example, the adhesive part 301a can be double-sided tape, the first protective part 302a can be a PC (Polycarbonate) sheet, and the second protective part 303a can be foam.

[0104] Reference Figure 1 and Figure 2 As shown, in some embodiments, the protective member 30 includes a second protective member 30b, which is located on one side of the cell assembly 20 along the second direction and is located between the first sub-casing wall 1121 and the cell assembly 20.

[0105] For example, the second protective component 30b can be foam with a thickness of 1 mm or more to fully fill the gap between the first sub-shell wall 1121 and the cell assembly 20, so as to prevent the cell assembly 20 from moving relative to the battery pack shell 10 when the battery pack is impacted, and to improve the buffering and energy absorption effect of the second protective component 30b.

[0106] Reference Figure 1 and Figure 2 As shown, in some embodiments, the protective member 30 includes a third protective member 30c, which is located on at least one side of the cell assembly 20 along a third direction.

[0107] The third protective component 30c includes two third protective parts 301c, which are respectively disposed on both sides of the battery cell assembly 20 along the third direction. Thus, the third protective component 30c can effectively protect the battery cell assembly 20 on both sides along the third direction, thereby reducing the vibration and impact transmitted to the battery cell assembly 20. For example, the third protective part 301c can be a PC sheet.

[0108] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery pack comprising a battery pack housing and a battery cell assembly, the battery pack housing having a receiving cavity configured to receive the battery cell assembly, characterized in that, The battery pack housing includes a first housing, which has an opening in a first direction; The first housing includes a first housing portion and a second housing portion connected to each other, the first housing portion and the second housing portion being disposed along a second direction; In the third direction, the size of the first housing part is larger than the size of the second housing part, and the gap between the battery cell assembly and the first housing part is larger than the gap between the battery cell assembly and the second housing part; The first direction, the second direction, and the third direction are arranged at angles to each other.

2. The battery pack according to claim 1, characterized in that, The first housing portion includes a first housing wall located on at least one side of the receiving cavity along the third direction; The first shell wall includes a shell wall body and a buffer structure that are connected to each other. The shell wall body has a clearance portion, and the buffer structure is disposed in the clearance portion. The buffer structure is configured to move relative to the shell wall body in the third direction.

3. The battery pack according to claim 2, characterized in that, The buffer structure includes a connecting part and a buffer part. One end of the connecting part along its extension direction is connected to the shell wall body, and the other end of the connecting part along its extension direction is connected to the buffer part.

4. The battery pack according to claim 3, characterized in that, The connecting portion extends along the second direction, and the buffer portion is located at one end of the connecting portion away from the second housing portion; And / or, the buffer portion is provided with a plurality of buffer protrusions on the outer side opposite to the receiving cavity; And / or, the clearance portion is a through hole, the through hole penetrates the shell wall body on opposite sides along the third direction, and the buffer structure has a first gap with the edge of the through hole, the first gap being greater than or equal to 1 mm and less than or equal to 5 mm; And / or, the cell assembly includes at least two cells, the thickness direction of the cells is along the first direction, the at least two cells are stacked along the first direction, and the buffer structure is disposed on opposite sides of the cell assembly along the third direction.

5. The battery pack according to claim 2, characterized in that, The first housing portion further includes a second housing wall, the first housing wall being connected to at least one side of the second housing wall along the third direction, the second housing wall having a curved surface structure, and the second housing wall protruding outward toward the receiving cavity.

6. The battery pack according to claim 5, characterized in that, The inner wall of the second shell wall along the second direction is provided with a first rib. The first rib extends along the first direction, and a plurality of the first ribs are arranged along the third direction. The protrusion height of the first rib on the side near the opening of the first shell part is greater than the protrusion height of the first rib on the side away from the opening of the first shell part. And / or, the first housing portion further includes a third housing wall located on one side of the receiving cavity along the first direction, the third housing wall being adjacent to the side of the second housing wall along the second direction; the second housing portion includes a fourth housing wall adjacent to the third housing wall, both the third housing wall and the fourth housing wall being provided with a second rib, the second rib extending along at least one of the second direction and the third direction.

7. The battery pack according to claim 1, characterized in that, Also includes: A protection board assembly is housed in the receiving cavity and is connected to one side of the battery cell assembly along a second direction. The protection board assembly is located on the side of the second housing portion opposite to the first housing portion.

8. The battery pack according to claim 7, characterized in that, The second housing portion further includes a fifth housing wall, which is located on one side of the receiving cavity along the second direction; At least a portion of the fifth shell wall is recessed toward the inside of the receiving cavity; And / or, the inner wall of the fifth shell wall is provided with a limiting part, the protective plate assembly includes a circuit board, the thickness direction of the circuit board is along the second direction, and the two sides of the circuit board along the third direction are inserted into the limiting part.

9. The battery pack according to claim 1, characterized in that, It also includes a protective component, which is disposed between the cell assembly and the battery pack casing; The protective component includes a first protective component, which is located on at least one side of the battery cell assembly along a first direction; And / or, the protective member includes a second protective member located on one side of the cell assembly along the second direction, and the second protective member is located between the first housing portion and the cell assembly; And / or, the protective element includes a third protective element located on at least one side of the cell assembly along a third direction.

10. The battery pack according to claim 9, characterized in that, The first protective component includes an adhesive portion, a first protective portion, and a second protective portion. The battery pack housing also includes a second housing connected to the first housing. The second housing is opened in the first direction, and the opening directions of the first housing and the second housing are opposite. The first housing has a first inner cavity, and the second housing has a second inner cavity. The first inner cavity and the second inner cavity together constitute the receiving cavity. The adhesive portion and the first protective portion are both disposed between the second outer shell and the battery cell assembly. The adhesive portion and the first protective portion are disposed along the second direction. The adhesive portion connects the second outer shell and the battery cell assembly, and the second protective portion is disposed between the first outer shell and the battery cell assembly. The thickness of the second protective component is greater than or equal to 1 mm; The third protective component includes two third protective parts, which are respectively disposed on both sides of the battery cell assembly along the third direction.

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