Battery pack

Abstract

The utility model provides a battery pack, and relates to the technical field of batteries. The battery pack comprises a box body, a plurality of soft package battery cells, a buffer piece and an insulating filling part, the plurality of soft package battery cells are arranged in the box body, and the insulating filling parts are filled in the space between the tab parts of the soft package battery cells and the box body and between the edge sealing parts of the adjacent soft package battery cells, so that no gap exists between one side, provided with the tab parts, of each soft package battery cell and the box body, and no gap exists between the adjacent soft package battery cells; therefore, the soft package battery cell can be more stably and reliably fixed in the box body, and the insulation filling part can also achieve the purpose of flame retardance of the soft package battery cell. The buffer part is arranged at the edge sealing part of the soft package battery cell, so that the edge sealing part can be prevented from being completely covered by the insulating filling part, and when the soft package battery cell generates a breathing effect, the insulating filling part cannot hinder the breathing effect of the soft package battery cell, so that the soft package battery cell can better adapt to the breathing effect of the soft package battery cell.

Description

Technical Field

[0001] The present application relates to a battery pack, and belongs to the technical field of battery packs. Background Art

[0002] During the use of lithium batteries, gas will be generated inside the battery cell due to internal chemical reactions, which will then cause breathing, causing the battery cell to expand and contract. For soft-pack batteries, an air cavity connected to the inside of the battery cell can be set at the edge of the battery cell so that the generated gas can be collected in the air cavity to avoid the expansion and contraction effect of the battery cell body being too obvious.

[0003] In some solutions of soft-pack battery packs using the CTP method, foam glue is poured between the pole ear of the soft-pack battery cell and the battery pack body to protect the pole ear and achieve insulation. However, the foam glue has a high hardness after molding, which will squeeze the air cavity, thereby affecting the breathing of the air cavity. In addition, in the event of thermal runaway, it will also affect the exhaust of the pole ear. Utility Model Content

[0004] The present application provides a battery pack, which solves the problems of obstructed breathing and inconvenient exhaust of the battery pack in the related art.

[0005] The present application provides a battery pack, comprising:

[0006] Box;

[0007] A plurality of soft-packed cells are stacked side by side in the box, wherein the soft-packed cells include a cell shell, an electrode assembly and a pole ear portion, wherein the cell shell includes a main body portion and an edge sealing portion, wherein the edge sealing portion is arranged on both sides of the main body portion, the electrode assembly is arranged in the main body portion, the pole ear portion is connected to the electrode assembly, and the pole ear portion extends through the edge sealing portion to the outside of the cell shell;

[0008] A buffer member, arranged on the edge sealing portion;

[0009] The insulating filling portion is filled between the edge sealing portions of adjacent soft-pack battery cells and between the pole ear portion and the box body, and the insulating filling portion is coated on the buffer component.

[0010] In some embodiments, the edge sealing portion has an air cavity therein, the main body portion has a cavity for accommodating the electrode assembly, the air cavity is communicated with the cavity, and the buffer component covers at least a portion of the air cavity.

[0011] In some embodiments, both opposite sides of the edge sealing portion are covered with the buffer member.

[0012] In some embodiments, an installation space is provided between the edge sealing portions of adjacent soft-pack battery cells, the buffer component is located in one of the two adjacent installation spaces, and opposite sides of the buffer component respectively cover the adjacent edge sealing portions.

[0013] In some embodiments, a rubber blocking portion is further included, and the rubber blocking portion is disposed on at least a portion of the periphery of the buffer component, so that the rubber blocking portion surrounds at least a portion of the buffer component.

[0014] In some embodiments, the buffer member is an elastic material member.

[0015] In some embodiments, the insulating filling part includes foamed glue.

[0016] In some embodiments, the box body has an exhaust channel to form an exhaust space, and the thickness of the buffer member gradually decreases in a direction from the buffer member being close to the exhaust channel to the buffer member being far away from the exhaust channel.

[0017] In the battery pack provided by the present application, the buffer is arranged at the edge sealing part of the soft-pack battery cell, which can prevent the hard insulating filling part from completely covering the edge sealing part, so that the insulating filling part will not squeeze the air cavity in the edge sealing part, so that when the soft-pack battery cell produces a breathing effect, the insulating filling part will not hinder the breathing effect of the soft-pack battery cell, so as to better adapt to the breathing effect of the soft-pack battery cell. When the soft-pack battery cell has thermal runaway and exhausts, the gas in the air cavity in the edge sealing part can be discharged smoothly, avoiding gas accumulation in the soft-pack battery cell, thereby improving the safety and reliability of the battery pack of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and other purposes, features and advantages of the embodiments of the present application will become more easily understood through the following detailed description with reference to the accompanying drawings. In the accompanying drawings, multiple embodiments of the present application will be described in an exemplary and non-limiting manner, wherein:

[0019] Figure 1 A schematic diagram of a battery pack according to an embodiment of the present application;

[0020] Figure 2 A schematic diagram of a soft-pack cell of a battery pack according to an embodiment of the present application;

[0021] Figure 3 A schematic side view of a partial structure of a soft-pack cell of a battery pack according to an embodiment of the present application;

[0022] Figure 4 A schematic top view of a soft-pack cell of a battery pack according to an embodiment of the present application;

[0023] Figure 5A schematic side view of a soft-pack cell of a battery pack according to an embodiment of the present application;

[0024] Figure 6 for Figure 5 Schematic cross-section of the middle BB;

[0025] Figure 7 A schematic diagram showing that the thickness of the buffer of the battery pack of the embodiment of the present application gradually decreases;

[0026] Figure 8 for Figure 7 A schematic diagram showing the enlarged view of area A.

[0027] Reference numerals:

[0028] 10-Battery Pack,

[0029] 100-box, 101-tray, 110-bottom plate, 111-inner cavity, 120-upper cover, 130-side beam,

[0030] 200-soft-pack battery cell, 210-battery cell shell, 211-main body, 212-edge sealing, 220-ear portion, 230-installation space,

[0031] 300-buffer,

[0032] 400-insulation filling part,

[0033] 500-rubber stopper. DETAILED DESCRIPTION

[0034] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0035] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0037] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0039] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0040] During the use of lithium batteries, gas will be generated inside the battery cell due to internal chemical reactions, which will then cause breathing, causing the battery cell to expand and contract. For soft-pack batteries, an air cavity connected to the inside of the battery cell can be set at the edge of the battery cell so that the generated gas can be collected in the air cavity to avoid the expansion and contraction effect of the battery cell body being too obvious.

[0041] In some solutions of soft-pack battery packs using the CTP method, foam glue is poured between the pole ear of the soft-pack battery cell and the battery pack body to protect the pole ear and achieve insulation. However, the foam glue has a high hardness after molding, which will squeeze the air cavity, thereby affecting the breathing of the air cavity. In addition, in the event of thermal runaway, it will also affect the exhaust of the pole ear.

[0042] In the battery pack proposed in the present application, multiple soft-pack cells are stacked side by side in a box, so that the box can protect multiple soft-pack cells. The insulating filling part is filled in the space between the pole ear of the soft-pack cell and the box, and is filled between the edge sealing parts of adjacent soft-pack cells, so that there is no gap between the side where the pole ear of the soft-pack cell is set and the box, and there is no gap between adjacent soft-pack cells, so that the soft-pack cell can be more stably and reliably fixed in the box, and the insulating filling part can also serve the purpose of flame retardant for the soft-pack cell. The buffer is arranged on the edge sealing part of the soft-pack cell, which can prevent the hard insulating filling part from completely covering the edge sealing part, so that the insulating filling part will not squeeze the air cavity in the edge sealing part, so that when the soft-pack cell produces a breathing effect, the insulating filling part will not hinder the breathing effect of the soft-pack cell, so as to better adapt to the breathing effect of the soft-pack cell. When the soft-pack battery cell experiences thermal runaway and exhausts gas, the gas in the air cavity within the edge sealing portion can be discharged smoothly, avoiding gas accumulation in the soft-pack battery cell, thereby improving the safety and reliability of the battery pack of the present application.

[0043] The battery pack provided in this application is described in detail below in conjunction with specific embodiments.

[0044] refer to Figures 1 to 3 As shown, the embodiment of the present application proposes a battery pack 10, including a box body 100, a plurality of soft-pack battery cells 200, an insulating filling portion 400 and a buffer 300. The battery pack 10 can be used as a power battery in a car or in other electrical devices, which is not limited by the present application.

[0045] Among them, the box body 100 is the basic component of the battery pack 10 of the present application, and the box body 100 can provide an installation foundation for at least some of the other components of the battery pack 10, and play the purpose of protecting at least some of the other components. The box body 100 can be made of metal material, so that the box body 100 has better structural strength, so that the durability and reliability of the box body 100 are better. The box body 100 has an inner cavity 111, and the inner cavity 111 of the box body 100 can be used to install at least some of the other components of the battery pack 10. The box body 100 includes a tray 101 and an upper cover 120, wherein the tray 101 includes a bottom plate 110 and a side beam 130. The bottom plate 110 is a plate-like structural member, and the side beam 130 is arranged along the bottom plate 110 at the circumferential edge of the bottom plate 110, the upper cover 120 is arranged opposite to the bottom plate 110, and the upper cover 120 is connected to the side beam 130, so that the side beam 130 can support the upper cover 120. The bottom plate 110 , the side beams 130 and the upper cover 120 may surround and form an inner cavity 111 of the box body 100 .

[0046] Multiple soft-pack battery cells 200 can be stacked side by side in the inner cavity 111 of the case 100. Specifically, some of the multiple soft-pack battery cells 200 can be stacked along the thickness direction of the soft-pack battery cells 200 to form one or more battery stacks. The battery stacks can be arranged in the inner cavity 111 of the case 100 along a direction perpendicular to the thickness direction of the soft-pack battery cells 200 to make full use of the space in the inner cavity 111 of the case 100, so that more soft-pack battery cells 200 can be set in the case 100.

[0047] The soft-pack battery 200 includes a battery housing 210, an electrode assembly (not shown in the figure) and a pole ear portion 220. The battery housing 210 can be made of aluminum-plastic film. The battery housing 210 includes a main body 211 and an edge sealing portion 212, the edge sealing portion 212 is arranged on both sides of the main body 211, and the edge sealing portion 212 seals the main body 211, so that the electrode assembly can be sealed in the main body 211, one end of the pole ear portion 220 can be connected to the electrode assembly, and the other end of the pole ear portion 220 can be inserted through the edge sealing portion 212 and extend to the outside of the battery housing 210. The pole ear portion 220 is a structural member that electrically connects the electrode assembly in the soft-pack battery 200 to the outside. In addition, the pole ear portions 220 of multiple soft-pack batteries 200 can be electrically connected to each other, so that multiple soft-pack batteries 200 can supply power to the outside at the same time. An air cavity may be specifically provided in the edge sealing portion 212 , a containing cavity may be provided in the main body 211 , the electrode assembly is provided in the containing cavity of the main body 211 , and the containing cavity of the main body 211 is communicated with the air cavity of the edge sealing portion 212 .

[0048] The buffer 300 is arranged on the edge sealing portion 212. Specifically, the buffer 300 is located on the side of the edge sealing portion 212. The buffer 300 is a deformable structural member. The thickness of the edge sealing portion 212 can be set to be less than the thickness of the main body 211. When multiple soft-pack battery cells 200 are stacked, there is a gap between the edge sealing portions 212 of adjacent soft-pack battery cells 200. The insulating filling portion 400 can be filled between the edge sealing portions 212 of adjacent soft-pack battery cells 200, so that the structure of the multiple stacked soft-pack battery cells 200 can be stable. The insulating filling portion 400 can also be arranged between the pole ear portions 220 of multiple soft-pack battery cells 200 and the side beams 130 of the box body 100, so that the insulating filling portion 400 can fully fill the gap space in the box body 100, so as to further stabilize the structure of the battery pack 10 of the present application, and at the same time achieve insulation between the pole ear portions 220 and the battery pack 10.

[0049] The insulating filling part 400 in the present application includes foam. When preparing the battery pack 10 of the present application, after installing a plurality of soft-packed cells 200 in the box 100, the gaps in the box 100 can be filled with foam, and the gaps in the box 100 can be fully filled after the foam expands. Specifically, the gaps between adjacent edge seals 212 and the gaps between the ear parts 220 of a plurality of soft-packed cells 200 and the inner cavity 111 of the box 100 can be fully filled. Since the foam constituting the insulating filling part 400 has a relatively high hardness after curing, in the absence of a buffer 300, the insulating filling part 400 will completely cover the edge seal 212, thereby limiting the contraction of the air cavity in the edge seal 212 and affecting the breathing of the soft-packed cells 200; in addition, in the event of thermal runaway, it will also affect the discharge of high-temperature and high-pressure gas from the edge seal 212, resulting in a decrease in the safety and reliability of the entire battery pack 10. When the buffer 300 is provided, the buffer 300 prevents the hard insulating filling portion 400 from completely covering the edge sealing portion 212, and the buffer 300 itself may have a certain elasticity, thereby not limiting the shrinkage of the air cavity within the edge sealing portion 212, and not affecting the breathing of the soft-pack battery cell 200; in addition, in the event of thermal runaway, it is also more conducive to the discharge of high-temperature and high-pressure gas from the edge sealing portion 212, thereby improving the safety and reliability of the battery pack 10.

[0050] In some embodiments, when the soft-pack battery cell 200 breathes, the area where the air cavity is set in the edge sealing portion 212 is the main part of the volume change of the edge sealing portion 212, and the buffer 300 can be set to cover at least part of the air cavity of the edge sealing portion 212. In this way, when the soft-pack battery cell 200 breathes and the volume of the edge sealing portion 212 expands, the edge sealing portion 212 can fully squeeze the buffer 300 and expand, so that the breathing effect of the soft-pack battery cell 200 is better.

[0051] In some embodiments, reference Figure 5 and Figure 6 As shown, both opposite sides of the edge sealing portion 212 of the soft-pack battery cell 200 can be covered with a buffer 300. Specifically, both opposite sides of the air cavity of the edge sealing portion 212 of each soft-pack battery cell 200 are covered with a buffer 300, and the buffer 300 can separate the opposite sides of the soft-pack battery cell 200 from the insulating filling portion 400. After the soft-pack battery cell 200 generates a breathing effect and the volume of the air cavity of the edge sealing portion 212 expands, the opposite sides of the edge sealing portion 212 can respectively squeeze the buffer 300 located on the opposite sides of the edge sealing portion 212, so that the edge sealing portion 212 expands to its opposite sides to squeeze the buffer 300 on the opposite sides of the edge sealing portion 212. In this way, the volume of the edge sealing portion 212 that can be expanded is larger, so that the volume of the gas that can be contained in the edge sealing portion 212 is larger, so that the soft-pack battery cell 200 can better maintain the breathing effect.

[0052] In addition, when the soft-pack battery cell 200 experiences thermal runaway, the gas in the air cavity of the edge sealing portion 212 can also be discharged through the buffer parts 300 on the opposite sides of the edge sealing portion 212, thereby improving the exhaust efficiency of the soft-pack battery cell 200 and further enhancing the safety and reliability of the battery pack 10.

[0053] In some embodiments, reference Figure 4 As shown, the buffer 300 in the present application can be arranged between adjacent edge sealing parts 212, and the opposite sides of the buffer 300 respectively cover the adjacent edge sealing parts 212. Specifically, the buffer 300 is located between the edge sealing parts 212 on the same side of adjacent soft-pack battery cells 200, and the buffer 300 can completely occupy the space between the adjacent edge sealing parts 212 in the stacking direction of the adjacent soft-pack battery cells 200, so that the volume of the edge sealing part 212 is relatively larger. In this way, the edge sealing part 212 can be unaffected by the insulating filling part 400 to a certain extent, so that the volume of the edge sealing part 212 can be more fully expanded.

[0054] In addition, in some embodiments, reference Figure 4As shown, in the present application, there may be a spacing between the edge sealing portions 212 of adjacent soft-packed cells 200, so that an installation space 230 may be formed between the edge sealing portions 212 of adjacent soft-packed cells 200, so that along the stacking direction of the multiple soft-packed cells 200, multiple installation spaces 230 located between the adjacent soft-packed cells 200 may be formed, and the multiple installation spaces 230 are distributed along the stacking direction of the multiple soft-packed cells 200. Of the two adjacent installation spaces 230, a buffer 300 is disposed in one of the installation spaces 230, and correspondingly, no buffer 300 is disposed in the other installation space 230. When gas is discharged into the edge sealing portions 212 of adjacent soft-pack battery cells 200 and the volume of the edge sealing portions 212 expands, the adjacent edge sealing portions 212 can be squeezed on the same buffer component 300 therebetween. This can reduce the number of buffer components 300 and the number of steps for installing the buffer components 300 on the edge sealing portions 212, thereby reducing the difficulty of the preparation process of the battery pack 10 of the present application and reducing the preparation cost.

[0055] In addition, it should be noted that the installation space 230 where the buffer component 300 is not set can be completely filled with the insulating filling part 400, so that the insulating filling part 400 can fill part of the space between adjacent soft-pack battery cells 200. In this way, the insulating filling part 400 can serve the purpose of limiting one side of the edge sealing part 212, so that after the gas is discharged into the edge sealing part 212, it can only expand toward the side of the edge sealing part 212 covered by the buffer component 300, so that the edge sealing part 212 can fully utilize the expansion space provided by the buffer component 300, so that the edge sealing part 212 can fully expand and deform.

[0056] In some embodiments, reference Figure 2 and Figure 3 As shown, the battery pack 10 of the present application may also be provided with a rubber stopper 500, and the rubber stopper 500 may be provided at least partially around the buffer 300, so that the rubber stopper 500 may surround at least partially the buffer 300. In this way, when the insulating filling part 400 is filled at the edge sealing part 212, the rubber stopper 500 may further separate at least part of the buffer 300 from the insulating filling part 400, so that the insulating filling part 400 does not completely cover the buffer 300. Accordingly, the rubber stopper 500 may also form an exhaust channel around the buffer 300. When the soft-pack battery cell is exhausted due to thermal runaway, the gas in the edge sealing part 212 may be discharged through the exhaust channel, thereby preventing the gas released by the edge sealing part 212 from accumulating in the box body, making the battery pack 10 safer.

[0057] The size of the rubber stopper 500 in the thickness direction of the soft-pack battery cell 200 can be larger than the size of the buffer 300 in the thickness direction of the soft-pack battery cell 200, so that the rubber stopper 500 can fully surround the buffer 300, thereby better forming an exhaust channel on the periphery of the buffer 300.

[0058] In some embodiments, the buffer 300 in the present application may be specifically configured as an elastic material member, so that the buffer 300 can be deformed. When the air cavity in the edge sealing portion 212 is discharged into the gas and the volume of the edge sealing portion 212 is expanded, the edge sealing portion 212 can squeeze the buffer 300 so that the buffer 300 is deformed, and the buffer 300 can have an elastic restoring force. When the gas in the edge sealing portion 212 is discharged and the volume of the edge sealing portion 212 is shrunk, the buffer 300 can expand under the action of its own elastic restoring force, so that the buffer 300 can restore its natural shape. The buffer 300 can be specifically prepared by a foam material, so that when the buffer 300 is an elastic member, the preparation cost is relatively low.

[0059] refer to Figures 5 to 8 As shown, in the height direction of the soft-pack battery cell 200, the size of the buffer 300 in the thickness direction of the soft-pack battery cell 200 gradually decreases. Accordingly, the buffer 300 is thinner near the bottom of the soft-pack battery cell 200, and the buffer 300 is thicker near the top of the soft-pack battery cell 200, thereby forming an exhaust channel toward the top of the soft-pack battery cell 200. When the soft-pack battery cell 200 has thermal runaway, it is more conducive to guiding the high-temperature and high-pressure gas to be discharged toward the top side of the soft-pack battery cell 200, and further discharged from the exhaust valve set on the box 100.

[0060] Finally, it should be noted that the above implementation modes are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned implementation modes, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned implementation modes can still be modified, or some or all of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the implementation modes of the present application.

Claims

1. A battery pack, characterized in that: include: Box (100); A plurality of soft-packed battery cells (200) are stacked side by side in the box (100); the soft-packed battery cells (200) comprise a battery cell shell (210), an electrode assembly and a pole ear portion (220); the battery cell shell (210) comprises a main body portion (211) and an edge sealing portion (212); the edge sealing portion (212) is arranged on both sides of the main body portion (211); the electrode assembly is arranged in the main body portion (211); the pole ear portion (220) is connected to the electrode assembly, and the pole ear portion (220) passes through the edge sealing portion (212) and extends to the outside of the battery cell shell (210); and an air cavity is provided in the edge sealing portion (212); An elastic buffer (300) is arranged on the edge sealing portion (212); The insulating filling portion (400) is filled between the edge sealing portions (212) of adjacent soft-pack battery cells (200), and is filled between the pole ear portion (220) and the box body (100), and the buffer (300) at least partially separates the insulating filling portion (400) from the edge sealing portion (212).

2. The battery pack according to claim 1, characterized in that: The main body (211) has a cavity for accommodating the electrode assembly, the air cavity is in communication with the cavity, and the buffer (300) covers at least a portion of the air cavity.

3. The battery pack according to claim 2, characterized in that: The buffer component (300) is covered on both opposite sides of the edge sealing portion (212).

4. The battery pack according to claim 2, characterized in that: The buffer component (300) is arranged between adjacent edge sealing portions (212), and opposite sides of the buffer component (300) respectively cover adjacent edge sealing portions (212).

5. The battery pack according to any one of claims 1 to 4, characterized in that: It also comprises a rubber blocking portion (500), wherein the rubber blocking portion (500) is arranged on at least part of the periphery of the buffer component (300), so that the rubber blocking portion (500) surrounds at least part of the buffer component (300).

6. The battery pack according to any one of claims 1 to 4, characterized in that: The buffer element includes foam.

7. The battery pack according to any one of claims 1 to 4, characterized in that: The insulating filling part (400) comprises foam glue.

8. The battery pack according to any one of claims 1 to 4, characterized in that: The thickness of the buffer (300) gradually decreases along the direction from the top to the bottom of the soft-package battery core (200).

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