Battery pack

Abstract

To provide a battery pack capable of discharging high-temperature smoke from an exhaust passage when a soft pack battery cell runs out of thermal runaway.SOLUTION: A battery pack includes a lower shell 1, a battery cell stack 2, a foam adhesive agent 3, an upper cover and a partition member 5. The lower shell has an upper opening part and an exhaust part. The battery cell stack includes a plurality of stacked soft pack battery cells 21, and is provided in the lower shell. The bottom side is connected to and fixed to a bottom plate of the lower shell. The foam adhesive agent is filled and connected between a tab side of the battery cell stack and the lower shell. The upper cover is located on an upper part side of the battery cell stack and covers the upper opening part of the lower shell. The partition member may be interposed between the upper cover and the battery cell stack, the partition member, the upper cover, and the battery cell stack may define an exhaust passage extending along a stacking direction of the soft pack battery cells, and the exhaust passage may communicate with the exhaust part 121 in a corresponding manner.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to the technical field of power batteries, and more particularly to battery packs. [Background technology]

[0002] When thermal runaway occurs in a battery cell of a battery pack, the emitted high-temperature smoke may spread randomly, resulting in thermal diffusion. In particular, in the case of soft-pack batteries, there is a certain degree of randomness in the exhaust path, and when a battery cell experiences thermal runaway, if high-temperature smoke is emitted from the tab side of the cell, short circuits at the tab and thermal diffusion may occur frequently, posing a safety hazard. Summary of the Invention [Problem to be solved by the invention]

[0003] In view of the above-mentioned drawbacks of the conventional technology, an object of the present invention is to provide a battery pack that solves the problem of battery cell short-circuiting and thermal diffusion being likely to occur when thermal runaway occurs in a battery cell of a battery pack of the conventional technology, and improves the safety performance of the battery pack. [Means for solving the problem]

[0004] To achieve the above and other related objectives, the present application provides: a lower shell having an upper opening and an exhaust; a battery cell stack including a plurality of stacked soft-pack battery cells, the battery cell stack being disposed within the lower shell and having a bottom side connected and fixed to a bottom plate of the lower shell; a foam adhesive filled between and connecting the tab side of the battery cell stack and the lower shell; an upper cover located on an upper side of the battery cell stack and covering an upper opening of the lower shell; a partition member sandwiched between the upper cover and the battery cell stack, the partition member, the upper cover, and the battery cell stack defining an exhaust passage extending along the stacking direction of the soft-pack battery cells, the exhaust passage corresponding to and communicating with the exhaust portion; A battery pack including:

[0005] Optionally, the number of the partition members is plural, the partition members are spaced apart along the length of the battery cell stack, and the upper cover and the battery cell stack define a plurality of the exhaust passages distributed along the length of the battery cell stack.

[0006] Optionally, the distance between two adjacent partition members is D, the length of the battery cell stack is W, and 1 / 5W≦D≦1 / 3W.

[0007] Optionally, the partition member and the top cover and / or the battery cell stack are fixed together by adhesive.

[0008] Optionally, the partition member comprises a structural adhesive.

[0009] Optionally, the lower shell includes an edge beam, an exhaust chamber is provided within the edge beam, the exhaust portion is provided on the edge beam, the exhaust passage is in communication with the exhaust chamber, and an explosion-proof valve suitable for venting from the exhaust chamber is mounted on the edge beam.

[0010] Optionally, an upper end of the edge beam has a sloped structure toward the exhaust passage, and the exhaust portion is provided on the sloped structure.

[0011] Optionally, the exhaust comprises an exhaust hole.

[0012] Optionally, the exhaust passage is located opposite the exhaust hole, and the width of the exhaust passage is the same as the width of the exhaust hole.

[0013] Optionally, the bottom side of the battery cell stack is directly bonded and fixed to the bottom plate of the lower shell via a thermally conductive structural adhesive.

[0014] Optionally, the number of the battery cell stacks is plural, and the plural battery cell stacks are arranged along the length direction of the battery cell stack; the lower shell further includes end beams and intermediate beams, adjacent battery cell stacks are separated by the intermediate beams, and tab sides of the battery cell stacks face the end beams or the intermediate beams, and the corresponding end beams or the intermediate beams are filled with and connected to the foam adhesive. [Effects of the Invention]

[0015] As described above, the battery pack of the present invention has at least the following advantageous effects: the bottom side of the battery cell stack is connected and fixed to the bottom plate of the lower shell, and a foam adhesive is filled between the tab side of the battery cell stack and the lower shell, so the battery cell stack is stably and securely attached, and the tabs of the soft-pack battery cells are less likely to short circuit or dissipate heat. Based on this, the partition member, the upper cover, and the upper side of the battery cell stack cooperate to define an exhaust passage, which avoids the tab side of the battery cell stack. In the event of thermal runaway of a soft-pack battery cell, high-temperature smoke can be discharged through the exhaust passage, improving the safety performance of the battery pack. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a structural diagram of an embodiment of a battery pack of the present invention; [Figure 2] FIG. 2 is a structural diagram of the battery pack shown in FIG. 1 after the top cover has been removed. [Figure 3] FIG. 3 is a top view of the battery pack of FIG. 2. [Figure 4] FIG. 2 is a side view of the battery pack of FIG. [Figure 5] FIG. 5 is a cross-sectional view taken along line AA in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, the present invention will be described with reference to specific embodiments. Those skilled in the art will easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0018] The structures, proportions, sizes, and other elements shown in the drawings in this specification are used solely to supplement the contents disclosed herein and facilitate the understanding and interpretation of those skilled in the art, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance, and any changes in structure, proportions, or size adjustments are within the scope of the technical content disclosed in this specification as long as they do not affect the effects or objectives achieved by the present invention. At the same time, terms such as "top," "bottom," "left," "right," "center," and "one" used in this specification are used solely for the convenience of explanation and are not intended to limit the scope of the present application. Changes or adjustments to their relative relationships are also considered to be within the scope of the present invention as long as they do not substantially change the technical content.

[0019] Referring to FIGS. 1 to 5, the present invention provides a battery pack. The battery pack includes a lower shell 1, a battery cell stack 2, a foam adhesive 3, an upper cover 4, and a partition member 5. The lower shell 1 has an upper opening and an exhaust port 121. The battery cell stack 2 includes a plurality of stacked soft-pack battery cells 21. The battery cell stack 2 is installed within the lower shell 1, and the bottom side of the battery cell stack 2 is connected and fixed to the bottom plate 11 of the lower shell 1. The foam adhesive 3 is filled between and connects the tab side of the battery cell stack 2 and the lower shell 1. The upper cover 4 is located above the battery cell stack 2 and covers the upper opening of the lower shell 1. The battery cell stack 2 can be inserted into the lower shell 1 through the upper opening. By covering the upper opening, the upper cover 4 can accommodate the battery cell stack 2 within an accommodation space defined by the upper cover 4 and the lower shell 1. The partition member 5 is sandwiched between the upper cover 4 and the battery cell stack 2. The upper surface of the partition member 5 contacts the lower surface of the upper cover 4, and the lower surface of the partition member 5 contacts the upper surface of the battery cell stack 2. The partition member 5, the upper cover 4, and the battery cell stack 2 define an exhaust passage 6 that extends along the stacking direction of the soft-pack battery cells 21. The exhaust passage 6 corresponds to and communicates with the exhaust section 121. If thermal runaway occurs in the soft-pack battery cells 21, high-temperature smoke can flow through the exhaust passage 6 to the exhaust section 121 and be discharged.

[0020] Optionally, the bottom side of the battery cell stack 2 is directly glued and fixed to the bottom plate 11 of the lower shell 1 via a thermally conductive structural adhesive, which ensures stable and reliable connection and simple and convenient operation.

[0021] Optionally, the partition member 5 and the upper cover 4 and / or the battery cell stack 2 are fixed together by adhesive.

[0022] Optionally, the partition member 5 includes a structural adhesive that has properties such as insulation, flame retardancy, and high temperature resistance, has excellent safety and contact sealing properties, and can prevent excessive compression of the battery cell stack 2.

[0023] Optionally, the exhaust part 121 includes an exhaust hole, which helps to exhaust smoke in a timely manner, and has a simple structure, is easy to process, and has low manufacturing costs. Furthermore, the exhaust passage 6 is disposed opposite the exhaust hole, and the width of the exhaust passage 6 is the same as the width of the exhaust hole, which is advantageous for improving exhaust efficiency.

[0024] Optionally, both ends of the soft-pack battery cell 21 in the length direction thereof have tabs. Here, in the present invention, the length direction of the soft-pack battery cell 21, the length direction of the battery cell stack 2, the width direction of the exhaust passage 6, and the width direction of the exhaust hole are the same, i.e., the X direction in the drawings. The thickness direction of the soft-pack battery cell 21, the stacking direction of multiple soft-pack battery cells 21 in the same battery cell stack 2, and the width direction of the battery cell stack 2 are the same, i.e., the Y direction in the drawings. The height direction of the soft-pack battery cell 21, the height direction of the battery cell stack 2, and the height direction of the lower shell 1 are the same, i.e., the Z direction in the drawings.

[0025] In the battery pack of the above embodiment, the battery cell stack 2 is connected and fixed to the lower shell 1, which helps improve the installation stability of the battery cell stack 2. In particular, the bottom side and tab side of the battery cell stack 2 are connected and fixed to the lower shell 1 simultaneously, making the connection more reliable and stable, making the battery cell stack 2 less likely to shake, and improving its impact resistance. The tab side of the battery cell stack 2 is connected to the lower shell 1 by filling it with foam adhesive 3, which insulates and seals the tabs of adjacent soft-pack battery cells 21, improving the structural stability and impact resistance of the tabs of the soft-pack battery cells 21, preventing high-temperature smoke from dispersing uncontrollably on the tab side of the battery cell stack 2, and reducing the risk of short circuits and heat diffusion on the tab side of the battery cell stack 2. The partition member 5, battery cell stack 2, and upper cover 4 cooperate to define an exhaust passage 6 located on the upper side of the battery cell stack 2, which not only facilitates exhaust but also avoids the tab side of the battery cell stack 2, thereby improving the safety performance of the battery pack.

[0026] 2, 3 and 5, in some optional embodiments, the lower shell 1 includes an edge beam 12, the non-tab side of the battery cell stack 2 faces the edge beam 12, an exhaust chamber 122 is provided within the edge beam 12, an exhaust section 121 is provided on the edge beam 12 and communicates with the exhaust passage 6 and the exhaust chamber 122, and an explosion-proof valve 7 suitable for exhausting air from the exhaust chamber 122 is mounted on the edge beam 12.

[0027] Optionally, the upper end of the edge beam 12 has a sloped structure 123 toward the exhaust passage 6, and the exhaust section 121 is disposed on the sloped structure 123, and the sloped structure 123 has the effect of guiding and buffering the smoke in the exhaust passage 6 from flowing into the exhaust section 121.

[0028] Optionally, the lower shell 1 further includes end beams 13. The number of the end beams 13 and the number of the edge beams 12 are both two. The end beams 13 and the edge beams 12 are alternately distributed and connected end to end to form a square frame. The bottoms of the end beams 13 and the edge beams 12 are connected to the bottom plate 11 of the lower shell 1. The structure of the lower shell 1 is simple and stable, and can provide stable mounting support for the battery cell stack 2.

[0029] Optionally, a plurality of exhaust sections 121 are provided on the edge beams 12, and the plurality of exhaust sections 121 are distributed along the length direction of the battery cell stack 2, and each exhaust passage 6 corresponds to and communicates with at least one exhaust section 121. Furthermore, each exhaust passage 6 corresponds to and communicates with two exhaust sections 121. Specifically, one end of the exhaust passage 6 faces one of the edge beams 12 and corresponds to and communicates with one of the exhaust sections 121 on the edge beams 12. The other end of the exhaust passage 6 faces one of the edge beams 12 and corresponds to and communicates with one of the exhaust sections 121 on the edge beams 12. This structural design helps to timely discharge high-temperature smoke in the exhaust passage 6 through the exhaust sections 121.

[0030] Optionally, the number of battery cell stacks 2 is plural, and the plural battery cell stacks 2 are arranged along the length direction of the battery cell stack 2; the lower shell 1 further includes an intermediate beam 14, and adjacent battery cell stacks 2 are separated by the intermediate beam 14, and both ends of the intermediate beam 14 are respectively connected to two edge beams 12, and the tab sides of the battery cell stacks 2 face the end beams 13 and the intermediate beam 14, and the corresponding end beams 13 and intermediate beams 14 are filled and connected with foam adhesive 3. Furthermore, the number of battery cell stacks 2 is two, and one tab side of the battery cell stacks 2 faces the end beam 13 and the other tab side faces the intermediate beam 14, which has a compact layout and can also avoid smoke flow paths, which is advantageous for improving safety performance.

[0031] In the battery pack of the above embodiment, if a soft-pack battery cell 21 experiences thermal runaway, high-temperature substances and gases pass through the exhaust passage 6, exhaust section 121, and exhaust chamber 122 in that order, and are then discharged through the explosion-proof valve 7. The flow path for the high-temperature substances and gases avoids the tab side of the battery cell stack 2, reducing the risk of short-circuiting or heat diffusion at the tabs of the soft-pack battery cells 21 in the battery cell stack 2 and improving the safety performance of the battery pack.

[0032] Referring to Figures 1 to 5, in some optional embodiments, the number of partition members 5 is multiple, and the multiple partition members 5 are spaced apart along the length of the battery cell stack 2, and the top cover 4 and the battery cell stack 2 define multiple exhaust passages 6 distributed along the length of the battery cell stack 2.

[0033] Optionally, the distance between two adjacent partition members 5 is D, that is, the width of the exhaust passage 6 is D, the length of the battery cell stack 2 is W, and 1 / 5W≦D≦1 / 3W.

[0034] In the battery pack of the above embodiment, the plurality of exhaust passages 6 are useful for improving the exhaust efficiency of high-temperature smoke and reducing the risk of thermal diffusion. The width of the exhaust passages 6 within an appropriate range is advantageous for improving the exhaust efficiency of the exhaust passages 6 and for reducing the impact of high-temperature smoke on the tab side of the battery cell stack.

[0035] In the battery pack of the present invention, a foam adhesive 3 is filled between the tab side of the battery cell stack 2 and the lower shell 1, and the upper side of the battery cell stack 2, the partition member 5, and the upper cover 4 cooperate to define an exhaust passage 6 that avoids the tab side of the battery cell stack 2, allowing high-temperature smoke to be exhausted from the non-tab side of the battery cell stack 2, reducing the impact on the tab side of the battery cell stack 2 and reducing the risk of short-circuiting or heat diffusion at the tabs of the soft-pack battery cells 21, thereby improving the safety performance of the battery pack.

[0036] In the description herein, the use of terms such as "this embodiment," "example," and "specific example" means that the specific feature, structure, material, or characteristic described in combination with the embodiment or example is included in at least one embodiment or example of the present invention. In the description herein, exemplary expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in any one or more embodiments or examples.

[0037] The above embodiments are intended solely to illustrate the principles and effects of the present invention, and are not intended to limit the present invention. Those skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by those with ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention should still be encompassed by the claims of the present application. [Industrial Applicability]

[0038] An object of the present invention is to provide a battery pack that solves the problem that short circuits and thermal diffusion of battery cells are likely to occur when thermal runaway occurs in a battery cell of a battery pack of conventional technology, and improves the safety performance of the battery pack. [Explanation of symbols]

[0039] Lower Shell 1 bottom plate 11 Edge Beam 12 Exhaust section 121 Exhaust chamber 122 Inclined structure 123 End beam 13 Intermediate beam 14 Battery cell stack 2 Soft pack battery cell 21 Foaming adhesive 3 Top cover 4 Partition member 5 Exhaust passage 6 Explosion-proof valve 7

Claims

1. a lower shell having an upper opening and an exhaust; a battery cell stack including a plurality of stacked soft-pack battery cells, the battery cell stack being disposed within the lower shell and having a bottom side connected and fixed to a bottom plate of the lower shell; a foam adhesive filled between and connecting the tab side of the battery cell stack and the lower shell; an upper cover located on an upper side of the battery cell stack and covering an upper opening of the lower shell; a partition member sandwiched between the upper cover and the battery cell stack, the partition member, the upper cover, and the battery cell stack defining an exhaust passage extending along the stacking direction of the soft-pack battery cells, the exhaust passage corresponding to and communicating with the exhaust portion; A battery pack comprising:

2. the number of the partition members is plural, the partition members are arranged at intervals along the length direction of the battery cell stack, and the upper cover and the battery cell stack define the exhaust passages distributed along the length direction of the battery cell stack.

2. The battery pack according to claim 1, wherein:

3. The distance between two adjacent partition members is D, the length of the battery cell stack is W, and 1 / 5W≦D≦1 / 3W.

3. The battery pack according to claim 2, wherein:

4. The partition member is fixed to the upper cover and / or the battery cell stack by adhesive.

2. The battery pack according to claim 1, wherein:

5. the partition member includes a structural adhesive; 5. The battery pack according to claim 1 or 4.

6. the lower shell includes an edge beam, an exhaust chamber is provided within the edge beam, the exhaust portion is provided on the edge beam, the exhaust passage and the exhaust chamber are in communication with each other, and an explosion-proof valve suitable for exhausting from the exhaust chamber is attached to the edge beam; 2. The battery pack according to claim 1, wherein:

7. The upper end of the edge beam has an inclined structure facing the exhaust passage, and the exhaust portion is provided on the inclined structure.

7. The battery pack according to claim 6, wherein:

8. The exhaust portion includes an exhaust hole.

8. The battery pack according to claim 1, 6 or 7.

9. The exhaust passage is provided opposite the exhaust hole, and the width of the exhaust passage is the same as the width of the exhaust hole.

9. The battery pack according to claim 8.

10. the bottom side of the battery cell stack is directly bonded and fixed to the bottom plate of the lower shell via a thermally conductive structural adhesive; 2. The battery pack according to claim 1, wherein:

11. the number of the battery cell stacks is plural, and the plural battery cell stacks are arranged along the length direction of the battery cell stacks; the lower shell further includes end beams and intermediate beams, the adjacent battery cell stacks are separated by the intermediate beams, the tab sides of the battery cell stacks face the end beams and the intermediate beams, and the corresponding end beams and intermediate beams are filled with and connected to each other by the foam adhesive; 7. The battery pack according to claim 1 or 6.

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