Battery Pack

Abstract

The utility model belongs to the technical field of power batteries, and particularly relates to a battery pack. It includes a lower shell, a battery cell stack, a heat-conducting structural adhesive, and a fireproof insulating component; the battery cell stack includes a plurality of stacked soft-pack batteries, and the bottom side of the battery cell stack is directly bonded and fixed to the bottom plate of the lower shell by a heat-conducting structural adhesive; the fireproof insulating component is located between the pole ear side of the battery cell stack and the lower shell, and the fireproof insulating component at least covers the inner wall of the lower shell facing the pole ear side of the battery cell stack to insulate and separate the pole ear side of the battery cell stack from the lower shell. The fireproof insulating component at least covers the inner wall of the lower shell facing the pole ear side of the battery cell stack, which is conducive to preventing the pole ear side of the battery cell stack from colliding with the lower shell and causing a short circuit, and avoiding thermal runaway caused by a short circuit; the bottom side of the battery cell stack is bonded and fixed to the lower shell, which is conducive to improving the installation stability of the battery cell stack, improving the impact resistance of the battery cell stack, and improving the safety performance of the battery pack.

Description

Technical Field

[0001] The utility model belongs to the technical field of power batteries, and in particular relates to a battery pack. Background Art

[0002] The stack of cells in the battery pack is prone to collision with the lower shell during and after being installed in the lower shell, which can easily cause safety accidents. In particular, the tab side of the stack of cells collides with the lower shell, which can easily cause deformation and short circuits. Short circuits can easily induce thermal runaway, resulting in low safety performance of the battery pack. Utility Model Content

[0003] In view of the shortcomings of the prior art described above, the purpose of the present utility model is to provide a battery pack for solving the problem of short circuit caused by collision between the ear side of the battery cell stack and the lower shell in the prior art, so as to reduce the risk of thermal runaway of the battery pack and improve the safety performance of the battery pack.

[0004] In order to achieve the above-mentioned object and other related objects, the utility model provides a battery pack, comprising:

[0005] Lower housing;

[0006] A battery cell stack, the battery cell stack comprising a plurality of stacked soft-pack battery cells, the battery cell stack being disposed in the lower housing;

[0007] A thermally conductive structural adhesive, by which the bottom side of the battery cell stack and the bottom plate of the lower shell are directly bonded and fixed; and

[0008] A fireproof insulation component is located between the tab side of the battery cell stack and the lower shell, and the fireproof insulation component at least covers the inner wall of the lower shell facing the tab side of the battery cell stack to insulate and separate the tab side of the battery cell stack from the lower shell.

[0009] Optionally, the fireproof insulation assembly includes a covering member, which is fixed to the lower shell and covers at least the inner wall of the lower shell on the side of the pole ear facing the battery cell stack.

[0010] Optionally, the lower shell includes an end beam facing the tab side of the cell stack, and the covering member located between the end beam and the tab side of the cell stack at least covers the side wall of the end beam facing the tab side of the cell stack.

[0011] Optionally, there are multiple battery cell stacks, and the lower shell also includes a middle beam located between the pole ear sides of two adjacent battery cell stacks, and the covering member located between the middle beam and the pole ear side of the battery cell stack at least covers the side wall of the middle beam facing the pole ear side of the battery cell stack.

[0012] Optionally, the covering member includes a first insulating portion and a second insulating portion, the first insulating portion covering the side wall of the lower shell on the pole ear side facing the battery cell stack, and the second insulating portion covering a first area of ​​the bottom plate of the lower shell, and the orthographic projection of the pole ear of the soft-pack battery cell in the height direction of the soft-pack battery cell is located within the first area.

[0013] Optionally, the first insulating portion and the second insulating portion are connected to form an L-shape.

[0014] Optionally, the first insulating portion of the covering member corresponding to the end beam covers the side wall of the end beam facing the pole ear side of the battery cell stack; the first insulating portion of the covering member corresponding to the middle beam covers the side wall of the middle beam facing the pole ear side of the battery cell stack.

[0015] Optionally, the middle beam has a first side and a second side which are arranged back to back and respectively face the pole ear sides of the adjacent battery cell stack, and the top end of the first insulating portion of the covering member located on the first side and / or the second side of the same middle beam is bent and extended to form a third insulating portion, and the third insulating portion covers the top end wall of the middle beam corresponding thereto.

[0016] Optionally, the third insulating portion of the covering member located on the first side of the middle beam is connected to the covering member located on the second side of the same middle beam.

[0017] Optionally, the covering member includes adhesive tape.

[0018] Optionally, the fireproof insulation assembly further includes a plurality of partitions, wherein the partitions are located between the covering member and the pole ear side of the battery cell stack, and the plurality of partitions are arranged at intervals along the stacking direction of the soft-pack battery cells to separate the pole ears of at least some adjacent soft-pack battery cells.

[0019] Optionally, the barrier member is adhesively fixed to the covering member or is integrally formed with the covering member.

[0020] Optionally, it also includes foam glue, which is filled and connected between the pole ear side of the battery cell stack and the fireproof insulation component.

[0021] As described above, the battery pack of the utility model has at least the following beneficial effects: the fireproof insulating component is arranged between the pole ear side of the battery cell stack and the lower shell, and at least covers the inner wall of the lower shell facing the pole ear side of the battery cell stack. The fireproof insulating component will not affect the overall structure of the battery cell stack, and can insulate and separate the pole ear side of the battery cell stack from the lower shell, which is beneficial to prevent the pole ear side of the battery cell stack from colliding with the lower shell and causing a short circuit, thereby avoiding thermal runaway caused by the short circuit; in addition, the bottom side of the battery cell stack is directly bonded and fixed to the lower shell, which is beneficial to improve the installation stability of the battery cell stack, improve the impact resistance of the battery cell stack, and prevent it from being deformed by impact, thereby improving the safety performance of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the partial structure of the battery pack of the utility model;

[0023] Figure 2 for Figure 1 A top view of the battery pack;

[0024] Figure 3 for Figure 1 A schematic diagram of the structure of the lower shell and fireproof insulation components of the battery pack;

[0025] Figure 4 for Figure 1 Schematic diagram of the structure of the battery cell stack and fireproof insulation components;

[0026] Figure 5 for Figure 4 Schematic diagram of the structure of the fireproof insulation component.

[0027] Part Number Description

[0028] Lower shell 1, bottom plate 11, side beam 12, end beam 13, battery cell stack 2, soft-pack battery cell 21, pole ear 211, fireproof insulation component 3, covering part 31, first insulating part 311, second insulating part 312, third insulating part 313, barrier part 32. DETAILED DESCRIPTION

[0029] The following is a description of the implementation of the present invention by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0030] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the utility model, should still fall within the scope of the technical content disclosed by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the utility model. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the utility model without substantial change of the technical content.

[0031] See also Figures 1 to 4 In some optional embodiments, the present application provides a battery pack, which includes a lower shell 1, a battery cell stack 2, a thermally conductive structural adhesive, and a fireproof insulating component 3; in addition to the above-mentioned components, the battery pack may also include an upper cover and / or a foaming adhesive. Among them, the battery cell stack 2 includes a plurality of stacked soft-pack batteries 21, the battery cell stack 2 is arranged in the lower shell 1, and the bottom side of the battery cell stack 2 is directly bonded and fixed to the bottom plate 11 of the lower shell 1 by a thermally conductive structural adhesive; the fireproof insulating component 3 is located between the pole ear side of the battery cell stack 2 and the lower shell 1, and the fireproof insulating component 3 at least covers the inner wall of the lower shell 1 facing the pole ear side of the battery cell stack 2 to insulate and separate the pole ear side of the battery cell stack 2 from the lower shell 1.

[0032] Optionally, the bottom side of the battery cell stack 2 is directly bonded and fixed to the bottom plate 11 of the lower shell 1 by means of a heat-conductive structural adhesive, so that the connection is stable and reliable, and the operation is simple and convenient.

[0033] Optionally, the upper cover is located on the top side of the cell stack 2 and covers the lower shell 1 , or in other words, the upper cover covers the upper opening of the lower shell 1 so that the cell stack 2 can be encapsulated in the accommodating space defined by the upper cover and the lower shell 1 .

[0034] In the battery pack of the above-mentioned embodiment, the pole ear side of the battery cell stack 2 is insulated and separated from the lower shell 1 by the fireproof insulating component 3, which can reduce the short-circuit risk of the battery cell stack 2, especially during the process of the battery cell stack 2 being loaded into the lower shell 1 and after the pole ear side of the battery cell stack 2 is mechanically deformed, the fireproof insulating component 3 can prevent the pole ear side of the battery cell stack 2 from contacting and short-circuiting with the lower shell 1, thereby effectively reducing the short-circuit risk, and further reducing the risk of thermal runaway, and improving the safety performance of the battery pack; and the fireproof insulating component 3 at least covers the inner wall of the lower shell 1 facing the pole ear side of the battery cell stack 2, that is, the fireproof insulating component 3 can be fixed on the lower shell 1 to avoid affecting the overall structure of the battery cell stack 2.

[0035] See also Figures 1 to 5 In some optional embodiments, the fireproof insulation assembly 3 includes a covering member 31 , which is fixed to the lower shell 1 and covers at least the inner wall of the lower shell 1 on the side of the pole ear facing the battery cell stack 2 .

[0036] Optionally, the covering member 31 is fixed to the lower shell body 1 by bonding, heat pressing or other fixing methods.

[0037] Optionally, the covering member 31 includes an adhesive tape, which has fireproof insulation properties, which can not only reduce the risk of short circuit between the battery stack 2 and the lower shell 1 and increase assembly safety, but also has a certain resistance to high-temperature smoke shock when the battery stack 2 has thermal runaway, which can reduce the risk of heat spread; in addition, the surface of the adhesive tape is smooth, which is convenient to assemble with the lower shell 1, simple to operate, occupies little space, and has little impact on the overall structure of the battery pack. Furthermore, the adhesive tape and the lower shell 1 can be bonded and fixed.

[0038] In the battery pack of the above-mentioned embodiment, the covering 31 has fireproof and insulating properties. The covering 31 is installed on the lower shell 1 before the battery cell stack 2, which can effectively prevent the battery cell stack 2 from short-circuiting with the lower shell 1 during the assembly process, thereby reducing the risk of thermal runaway. In addition, after the battery cell stack 2 is installed in the lower shell 1, the ear side of the battery cell stack 2 can also be insulated and separated from the lower shell 1 by the covering 31, even if the battery cell stack 2 is deformed by mechanical impact, the short circuit between the battery cell stack 2 and the lower shell 1 can be effectively prevented.

[0039] See also Figures 1 to 5 In some optional embodiments, the covering member 31 includes a first insulating portion 311 and a second insulating portion 312, the first insulating portion 311 covers the side wall of the lower shell 1 on the ear side facing the battery cell stack 2, and the second insulating portion 312 covers a first area of ​​the bottom plate 11 of the lower shell 1, and the orthographic projection of the ear 211 of the soft-pack battery cell 21 in the height direction of the soft-pack battery cell 21 is located in the first area.

[0040] Optionally, the first insulating portion 311 and the second insulating portion 312 are connected to form an L-shape.

[0041] In the battery pack of the above embodiment, the covering member 31 has a simple structure and is easy to form and manufacture. It is easy to assemble with the lower shell 1 and can effectively prevent a short circuit between the tab side of the battery cell stack 2 and the lower shell 1, thereby improving the safety performance of the battery pack.

[0042] See also Figures 1 to 5In some optional embodiments, the lower shell 1 includes an end beam 13 facing the pole ear side of the battery cell stack 2, and a covering member 31 located between the end beam 13 and the pole ear side of the battery cell stack 2 at least covers the side wall of the end beam 13 facing the pole ear side of the battery cell stack 2.

[0043] Optionally, the first insulating portion 311 of the covering member 31 corresponding to the end beam 13 covers the side wall of the end beam 13 facing the pole ear side of the battery cell stack 2 .

[0044] In the battery pack of the above embodiment, the covering member 31 corresponding to the end beam 13 can insulate and separate the tab side of the cell stack 2 from the end beam 13 , thereby reducing the risk of short circuit between the tab side of the cell stack 2 and the end beam 13 of the lower shell 1 .

[0045] See also Figures 1 to 5 In some optional embodiments, there are multiple battery cell stacks 2, and the lower shell 1 also includes an intermediate beam located between the pole ear sides of two adjacent battery cell stacks 2, and a covering member 31 located between the intermediate beam and the pole ear side of the battery cell stack 2 at least covers the side wall of the intermediate beam facing the pole ear side of the battery cell stack 2.

[0046] Optionally, the first insulating portion 311 of the covering member 31 corresponding to the middle beam covers the side wall of the middle beam facing the pole ear side of the battery cell stack 2. Further, the middle beam has a first side and a second side that are arranged opposite to each other and respectively face the pole ear side of the adjacent battery cell stack 2, and the top end of the first insulating portion 311 of the covering member 31 located on the first side and / or the second side of the same middle beam is bent and extended to form a third insulating portion 313, and the third insulating portion 313 covers the top end wall of the middle beam corresponding thereto, that is, the covering member 31 on at least one of the first side and the second side of the same middle beam has the third insulating portion 313 to ensure that the end wall of the middle beam facing the upper cover is completely insulated, thereby reducing the risk of short circuit of the battery cell stack 2. Furthermore, the two covering parts 31 corresponding to the same middle beam can be connected together, and the two covering parts 31 can be connected to form a "J" shape, which has a more stable structure and higher safety performance; specifically, the third insulating portion 313 of the covering part 31 located on the first side of the middle beam is connected to the covering part 31 located on the second side of the same middle beam, that is, the covering part 31 located on the first side of the middle beam has a third insulating portion 313, and the third insulating portion 313 extends along the covering part 31 on the second side of the same middle beam and is connected to the first insulating portion 311 of the covering part 31 on the second side; in this embodiment, the two covering parts 31 can be connected together and then installed in the lower shell 1, which makes assembly simpler and more convenient; specifically, the two covering parts 31 corresponding to the same middle beam can be integrally formed or bonded together.

[0047] Optionally, the lower shell 1 also includes side beams 12, the number of end beams 13 and side beams 12 is two, the end beams 13 and side beams 12 are alternately distributed and connected end to end to form a square frame, the bottom of the end beams 13 and the side beams 12 are connected to the bottom plate 11 of the lower shell 1, and the two ends of the middle beam are connected to the inner walls of the two side beams 12. The structure of the lower shell 1 is simple and stable, and can provide stable installation support for the battery cell stack 2.

[0048] In the battery pack of the above embodiment, the covering member 31 corresponding to the middle beam can insulate and separate the tab side of the battery cell stack 2 from the middle beam, thereby reducing the risk of short circuit between the tab side of the battery cell stack 2 and the middle beam of the lower shell 1 .

[0049] See also Figures 1 to 5 In some optional embodiments, the fireproof insulation assembly 3 further includes a plurality of partitions 32, the partitions 32 being located between the covering member 31 and the pole ear side of the battery cell stack 2, and the plurality of partitions 32 being arranged at intervals along the stacking direction of the soft-pack battery cells 21 to separate the pole ears 211 of at least some adjacent soft-pack battery cells 21.

[0050] Optionally, the barrier 32 is adhesively fixed to the covering 31 or is integrally formed with the covering 31. Furthermore, the barrier 32 is connected and fixed to the first insulating portion 311 and the second insulating portion 312 of the covering 31, the connection is reliable, and the structure is firm and stable. In the present embodiment, when the barrier 32 and the covering 31 are independently formed and then assembled and connected and fixed, the covering 31, the battery cell stack 2 and the barrier 32 can be successively loaded into the lower shell 1, or in other words, the covering 31 can be loaded first, then the battery cell stack 2, and then the barrier 32, and the assembly operation is simple and convenient, and the assembly difficulty is low. It can be understood that the covering 31 and the barrier 32 can also be loaded into the lower shell 1 together, and the specific assembly order can be adjusted according to needs.

[0051] Optionally, in the length direction of the soft-pack battery cell 21, both ends of the soft-pack battery cell 21 have a pole ear 211, and the side of the soft-pack battery cell 21 having the pole ear 211 is the same side as the pole ear side of the battery cell stack 2. In the present application, the length direction of the soft-pack battery cell 21 is the same as the length direction of the battery cell stack 2, that is, the X direction in the accompanying 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, that is, the Y direction in the accompanying drawings; the height direction of the soft-pack battery cell 21, the height direction of the pole ear 211 of the soft-pack battery cell 21, the height direction of the pole ear side of the battery cell stack 2, the height direction of the battery cell stack 2, and the height direction of the lower shell 1 are the same, that is, the Z direction in the accompanying drawings.

[0052] In the battery pack of the above-mentioned embodiment, the tabs 211 of adjacent soft-pack cells 21 can be insulated and separated by the barrier 32, so as to prevent the tabs 211 of the soft-pack cells 21 from deforming and contacting with the tabs 211 of other soft-pack cells 21 to cause a short circuit, thereby reducing the risk of thermal runaway.

[0053] See also Figures 1 to 5 In some optional embodiments, the foamed glue is filled and connected between the pole ear side of the battery cell stack 2 and the fireproof insulation component 3.

[0054] Optionally, two adjacent barrier members 32 , the covering member 31 and the tab end of the soft-pack battery cell 21 cooperate to define a receiving space suitable for filling with foam glue, and the foam glue completely covers the tab 211 of the soft-pack battery cell 21 .

[0055] In the battery pack of the above embodiment, the foam glue has the function of protecting the battery cell stack 2. Filling with the foam glue is beneficial to improving the stability and impact resistance of the overall structure, reducing the risk of short circuit and heat spread on the ear side of the battery cell stack 2, and improving the safety performance of the battery pack.

[0056] In the battery pack of the present invention, the tab side of the battery cell stack 2 is separated from the lower shell 1 by a fireproof insulating component 3, which reduces the risk of short circuit on the tab side of the battery cell stack 2, thereby reducing the risk of thermal runaway caused by short circuit, thereby improving the safety performance of the battery pack.

[0057] In the description of this specification, the description with reference to the terms "this embodiment", "example", "specific example", 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 utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0058] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A battery pack, characterized in that: include: Lower housing; A battery cell stack, the battery cell stack comprising a plurality of stacked soft-pack battery cells, the battery cell stack being disposed in the lower housing; Thermally conductive structural adhesive, the bottom side of the battery cell stack and the bottom plate of the lower shell are directly bonded and fixed by the thermally conductive structural adhesive; as well as A fireproof insulation component is located between the tab side of the battery cell stack and the lower shell, and the fireproof insulation component at least covers the inner wall of the lower shell facing the tab side of the battery cell stack to insulate and separate the tab side of the battery cell stack from the lower shell.

2. The battery pack according to claim 1, characterized in that: The fireproof insulation assembly includes a covering member, which is fixed on the lower shell and covers at least the inner wall of the lower shell on the side of the pole ear facing the battery cell stack.

3. The battery pack according to claim 2, characterized in that: The lower shell includes an end beam facing the tab side of the cell stack, and the covering member located between the end beam and the tab side of the cell stack at least covers the side wall of the end beam facing the tab side of the cell stack.

4. The battery pack according to claim 3, characterized in that: There are multiple battery cell stacks, and the lower shell also includes a middle beam located between the pole ear sides of two adjacent battery cell stacks, and the covering member located between the middle beam and the pole ear side of the battery cell stack at least covers the side wall of the middle beam facing the pole ear side of the battery cell stack.

5. The battery pack according to claim 4, characterized in that: The covering member includes a first insulating portion and a second insulating portion, the first insulating portion covering the side wall of the lower shell facing the tab side of the battery cell stack, the second insulating portion covering a first area of ​​the bottom plate of the lower shell, and the orthographic projection of the tab of the soft-pack battery cell in the height direction of the soft-pack battery cell is located within the first area.

6. The battery pack according to claim 5, characterized in that: The first insulating portion and the second insulating portion are connected to form an L shape.

7. The battery pack according to claim 5, characterized in that: The first insulating portion of the covering member corresponding to the end beam covers the side wall of the end beam facing the tab side of the battery cell stack; the first insulating portion of the covering member corresponding to the middle beam covers the side wall of the middle beam facing the tab side of the battery cell stack.

8. The battery pack according to claim 5, characterized in that: The middle beam has a first side and a second side which are arranged back to back and respectively face the pole ear sides of the adjacent battery cell stack. The top end of the first insulating portion of the covering member located on the first side and / or the second side of the same middle beam is bent and extended to form a third insulating portion, and the third insulating portion covers the top end wall of the middle beam corresponding thereto.

9. The battery pack according to claim 8, characterized in that: The third insulating portion of the covering member located on a first side of the intermediate beam is connected to the covering member located on a second side of the same intermediate beam.

10. The battery pack according to claim 2, characterized in that: The covering comprises adhesive tape.

11. The battery pack according to any one of claims 2 to 10, characterized in that: The fireproof insulation assembly also includes a plurality of partitions, which are located between the covering member and the tab side of the battery cell stack, and the plurality of partitions are arranged at intervals along the stacking direction of the soft-pack battery cells to separate the tabs of at least some adjacent soft-pack battery cells.

12. The battery pack according to claim 11, characterized in that: The barrier member is bonded and fixed to the covering member or is integrally formed with the covering member.

13. The battery pack according to any one of claims 1 to 10, characterized in that: It also includes foam glue, which is filled and connected between the pole ear side of the battery cell stack and the fireproof insulation component.

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