Pressure relief and exhaust structure of battery pack

Abstract

The utility model relates to a battery pack pressure relief and exhaust structure in the technical field of battery manufacturing, which comprises a box body, a battery cell monomer and a cross beam, the cross beam and the battery cell monomer are arranged in the box body, the cross beam is positioned on one side of the battery cell monomer, an exhaust passage is arranged in the cross beam, and an explosion-proof valve on the battery cell monomer is communicated with the exhaust passage of the cross beam. By means of the arrangement, the influence of high-temperature gas on the single battery cells during pressure relief is effectively avoided, heat spreading is prevented, and meanwhile it is guaranteed that the gas is rapidly exhausted out of the box body during pressure relief.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery manufacturing technical field especially relates to a battery pack pressure relief exhaust structure. BACKGROUND

[0002] Battery pack is an important component of new energy automobile, its function can not be ignored, and its safety performance is very important. The battery pack includes a plurality of battery monomers and a battery management system and the like structure, wherein the battery monomer is the basic unit of the battery pack, and the battery management system is used to manage the battery monomer, adjust the state of the battery monomer, and ensure that the battery pack operates safely and reliably.

[0003] Each battery monomer is equipped with an explosion-proof valve, when the battery monomer occurs thermal runaway, the explosion-proof valve will break, thereby releasing the gas pressure and heat inside the battery monomer, and explosion of the battery monomer is avoided.

[0004] However, in the existing design, since a plurality of battery monomers are included in the battery pack, once thermal runaway occurs in a certain battery monomer in the battery pack, the heat released by the explosion-proof valve of the battery monomer can cause chain runaway of other battery monomers.

[0005] Therefore, a battery pack pressure relief exhaust structure is urgently needed to solve the above problems. UTILITY MODEL CONTENTS

[0006] Therefore, a battery pack pressure relief exhaust structure is urgently needed to solve the above problems.

[0007] The utility model provides a battery pack pressure relief exhaust structure, including box, electric core monomer and crossbeam.

[0008] Specifically, the crossbeam and the electric core monomer are arranged in the box, the crossbeam is located at one side of the electric core monomer, the crossbeam is provided with an exhaust passage, the explosion-proof valve on the electric core monomer is in communication with the exhaust passage of the crossbeam, and the exhaust passage of the crossbeam is in communication with the outside of the box.

[0009] Specifically, the electric core monomer is arranged in two rows, the crossbeam is arranged between the two rows of electric core monomers and connected to the box, the electric core monomers in one row are arranged in one-to-one correspondence with the electric core monomers in the other row, the explosion-proof valve on the electric core monomer is arranged at a non-central position of the electric core monomer, and the explosion-proof valves on the corresponding two electric core monomers in the two rows of electric core monomers are staggered.

[0010] Specifically, both sides of the crossbeam are provided with exhaust ports, the exhaust ports correspond to the explosion-proof valves one by one, the explosion-proof valves on the battery monomer are communicated with the exhaust passages in the crossbeam through the exhaust ports, the side wall of the box body is provided with a passage, the exhaust passages communicate the exhaust ports and the box body side wall passage, and the box body side wall passage is connected to the outside of the box body.

[0011] Specifically, the battery monomers are at least two, and the battery monomers are arranged along the length direction of the battery monomers, and the length direction of the battery monomers is perpendicular to the crossbeam.

[0012] Specifically, the exhaust ports located on the same side of the crossbeam are distributed along the length direction of the crossbeam, and adjacent two exhaust ports are staggered.

[0013] Specifically, both ends of the crossbeam are provided with longitudinal beams, and the exhaust passages are communicated with the box body side wall passage through the longitudinal beams.

[0014] Further, the bottom of the box body is provided with a groove, the upper side of the groove is connected with the crossbeam, and both ends of the groove are communicated with the longitudinal beams.

[0015] Specifically, one end of the battery monomer away from the crossbeam is provided with a pole.

[0016] Further, the battery monomer further comprises a voltage sampling point, and the voltage sampling point and the pole are arranged on the same side of the battery monomer.

[0017] Specifically, the crossbeam is further provided with a plurality of reinforcing beams.

[0018] The advantages of the utility model are as follows:

[0019] The utility model discloses a kind of battery pack pressure relief exhaust structure. The explosion-proof valve of battery monomer in battery pack corresponds with the exhaust port on crossbeam, gas is discharged outside box body through exhaust passage when breaking, ensure safety.In addition, the explosion-proof valve on battery monomer is non-central arrangement, and it is staggered with the explosion-proof valve of adjacent battery monomer, and it is also staggered with the explosion-proof valve on the battery monomer of crossbeam opposite side, avoid high-temperature gas pressure relief to adjacent battery monomer and countermeasure battery monomer produce influence, prevent heat spread. The pole of battery monomer is arranged on the opposite side of explosion-proof valve, realize heat and electricity separation, facilitate independent design heat management and electric connection structure, simplify overall design.

[0020] The surface of the crossbeam of the battery pack is provided with a plurality of reinforcing beams, which enhances the structural strength and improves the overall stability and durability of the battery pack. In addition, the crossbeam is communicated with the groove at the bottom of the box, the longitudinal beam and the passage in the side wall of the box, forming a clear pressure relief path, further improving safety. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings described below are only a part of the embodiments of the present application, and not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0022] Wherein the same parts are indicated by the same reference numerals. It should be noted that the words "front", "back", "left", "right", "up" and "down" used in the following description refer to the directions in the drawings, and the words "bottom" and "top", "inner" and "outer" refer to the directions towards or away from the geometric center of a particular part.

[0023] Figure 1 The overall structure schematic diagram of the embodiment of the present application is shown in the figure;

[0024] Figure 2 The structure schematic diagram of the cross beam in the embodiment of the present application is shown in the figure, wherein figure A is the overall structure diagram of the cross beam, and figure B is the partial structure diagram of the cross beam;

[0025] Figure 3 The cross-sectional view of the partial structure of the cross beam in figure B is shown in the figure; Figure 2 The cross-sectional view of the partial structure of the cross beam in figure B is shown in the figure;

[0026] Figure 4 The disassembly schematic diagram of the battery cell monomer in the embodiment of the present application is shown in the figure.

[0027] In the above drawings, the meanings of the reference numerals are as follows:

[0028] 1. Battery cell monomer;

[0029] 2. Cross beam; 21. Exhaust port; 22. Exhaust passage; 23. Longitudinal beam;

[0030] 3. Box body; 31. Groove; 32. Box body side wall passage. DETAILED DESCRIPTION

[0031] The technical solutions of the present application will be described clearly and completely in combination with the embodiments of the present application and the drawings thereof. Obviously, the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the summary of the application and the detailed description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the use of the terms "including" and "having" and variations thereof herein is meant to encompass the inclusion of but not limited to.

[0033] In the description of the specific embodiments of the application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0034] In the present application, the term "embodiment" means that the specific features, structures or characteristics described in conjunction with the embodiment can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily refer to the same embodiment, nor is it independent or alternative to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present application can be combined with other embodiments.

[0035] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship between the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in the present application generally represents a "or" relationship between the front and rear associated objects.

[0036] Throughout this document, numerical values represent approximate measures or limits to ranges to encompass minor deviations from a given value and embodiments having about the stated value and embodiments having the stated exact value. Except in the working examples provided at the end of the detailed description, all numerical values of parameters such as amounts or conditions are to be understood as modified in all instances by the term "about" whether or not "about" actually appears before the numerical value so modified. "About" indicates that the stated numerical value allows some slight imprecision in the value with some degree of error in the range for the stated value, approximately or reasonably to the stated value. If an imprecision provided by "about" in this context causes the end result to fall outside of a range recited in the broadest form of the recited aspect, then the technological field is intended to include the disclosed range. "About" can indicate that approximations of a value along with the ordinary errors and deviations of the manufacturing and production processes are acceptable, normally due to minor variations from the nominal specified parameters. For example, "about" can include a variation less than or equal to 5%, optionally less than or equal to 4%, optionally less than or equal to 3%, optionally less than or equal to 2%, optionally less than or equal to 1%, optionally less than or equal to 0.5%, and in some aspects, optionally less than or equal to 0.1%.

[0037] In addition, the disclosure of ranges includes all values and further divisions of ranges within the entire ranges disclosed, including the endpoints and subranges given for the ranges.

[0038] Embodiments of the present application will now be described in greater detail below by way of example. It should be noted that embodiments of the present application are not limited to only these examples.

[0039] The battery pack is an important component of a new energy vehicle, and its safety performance is extremely important. The battery pack in the prior art includes a plurality of battery monomers arranged in a box body, and each battery monomer is provided with an explosion-proof valve. When the battery monomer is in thermal runaway, the explosion-proof valve bursts to release the internal gas pressure and heat of the battery monomer, thereby preventing the battery monomer from exploding.

[0040] However, in the battery pack, once a battery monomer is in thermal runaway, the heat released from the explosion-proof valve of the battery monomer will cause other battery monomers to also be in chain runaway. Therefore, the present application provides a battery pack pressure relief and exhaust structure to solve the above-mentioned thermal runaway problem.

[0041] The battery pack pressure relief and exhaust structure mainly includes a battery monomer 1, a cross beam 2, and a box body 3. The cross beam 2 and the battery monomer 1 are arranged in the box body, the cross beam 2 is located on one side of the battery monomer 1, the cross beam 2 is provided with an exhaust passage 22, the explosion-proof valve on the battery monomer 1 is in communication with the exhaust passage 22 on the cross beam 2, and the exhaust passage on the cross beam 2 is in communication with the outside of the box body 3.

[0042] Through the above arrangement, when one of the battery monomers 1 occurs thermal runaway, the internal gas is released into the exhaust channel 22 of the crossbeam 2 through the explosion-proof valve, and since the exhaust channel 22 is in communication with the outside of the box 3, the hot gas entering the exhaust channel 22 can be discharged to the outside of the box 3, thereby preventing the influence on other battery monomers 1 in the battery pack and triggering a chain reaction, which helps to improve the safety of the battery pack.

[0043] Specifically, as shown in Figure 1 , the box 3 is internally provided with battery monomers 1, the battery monomers 1 are arranged in two rows, and the crossbeam 2 is arranged between the two rows of battery monomers 1 and connected to the box 3. The battery monomers 1 in one row are arranged one by one corresponding to the battery monomers 1 in the other row.

[0044] Through the above arrangement, the two rows of battery monomers 1 share one crossbeam 2, which can save space in the box 3.

[0045] Specifically, the explosion-proof valve on the battery monomer 1 faces the crossbeam 2, and the explosion-proof valve is arranged at a non-central position of the battery monomer 1, so that the explosion-proof valves on the battery monomers 1 in one row are staggered with the explosion-proof valves on the corresponding battery monomers 1 in the other row.

[0046] Considering that the high-temperature gas when the battery monomer 1 is depressurized reaches 600-700℃, through the above arrangement, the asymmetric design of the explosion-proof valve can avoid the influence of the explosion-proof valve on one battery monomer 1 on one side of the crossbeam 2 on the explosion-proof valve on the corresponding battery monomer 1 on the other side of the crossbeam 2, and the staggered arrangement of the explosion-proof valve of the battery monomer 1 can avoid heat spreading.

[0047] In this embodiment, as shown in Figure 2 , Figure 3 and Figure 4 , the crossbeam 2 is provided with exhaust ports 21 on both sides, the exhaust ports 21 correspond one by one to the explosion-proof valves, the crossbeam 2 is internally provided with an exhaust channel 22, the side wall of the box 3 is provided with a box side wall channel 32, the exhaust channel 22 connects the exhaust ports 21 and the box side wall channel 32, and the box side wall channel 32 is connected to the outside of the box 3. When the explosion-proof valve of the battery monomer 1 is broken, the gas can be discharged to the outside of the box 3 through the exhaust ports 21 along the exhaust channel 22.

[0048] Further, referring to Figure 2 , the exhaust ports 21 on the same side of the crossbeam 2 are distributed along the length direction of the crossbeam 2, and adjacent two exhaust ports 21 are staggered.

[0049] Through the above arrangement, the explosion-proof valves on the two adjacent battery monomers 1 on the same side of the crossbeam 2 are staggered, which avoids the influence on the two adjacent battery monomers 1 when one of the battery monomers 1 occurs thermal runaway, and further prevents the battery pack from thermal runaway.

[0050] In some embodiments, as shown in Figure 4 The two ends of the cross beam 2 are provided with longitudinal beams 23, and the exhaust channel 22 on the cross beam 2 communicates with the side wall channel 32 of the box through the longitudinal beams 23.

[0051] Further, the bottom of the box 3 is provided with a groove 31, the upper part of the groove 31 is connected with the cross beam 2, and the two ends of the groove 31 communicate with the longitudinal beams 23, forming a clear pressure relief path, further improving safety.

[0052] Through the above setting, the gas in the battery monomer 1 enters the cross beam 2, enters the groove 31 from the bottom end of the cross beam 2, and enters the longitudinal beams 23 at both ends through the groove 31, and then is discharged to the outside of the box. Hot gas passes through the bottom of several battery monomers 1, which helps to reduce the influence on the battery monomer 1.

[0053] In some embodiments, the end of the battery monomer 1 away from the cross beam 2 is provided with a pole.

[0054] Further, the battery monomer 1 also includes a voltage sampling point, and the voltage sampling point and the pole are arranged on the same side.

[0055] Through the above setting, the pole and the voltage sampling point on the battery monomer 1 are arranged on the side opposite to the explosion-proof valve, which can realize the thermal and electrical separation in the battery pack, facilitate the independent design of the heat management and the electrical connection related structure, and the structure is simple.

[0056] In some embodiments, the cross beam 2 is also provided with a plurality of reinforcing beams, which enhance the structural strength and improve the overall stability and durability of the battery pack.

[0057] It should be noted that the above only describes the preferred embodiments of the present application, and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A battery pack pressure relief vent structure, comprising: The battery includes a box, a cell monomer and a beam, the beam and the cell monomer are arranged in the box, the beam is located at one side of the cell monomer, the beam is provided with an exhaust passage, an explosion-proof valve on the cell monomer is arranged in communication with the exhaust passage of the beam, and the exhaust passage of the beam is arranged in communication with the outside of the box.

2. The battery pack pressure relief vent structure of claim 1, wherein, The cell monomer is arranged in two rows, the beam is arranged between the two rows of cell monomers and connected to the box, and the cell monomers in one row are arranged in one-to-one correspondence with the cell monomers in the other row. The explosion-proof valve on the cell monomer is arranged at a non-central position of the cell monomer, and the explosion-proof valves on the corresponding two cell monomers in the two rows of cell monomers are arranged alternately.

3. The battery pack pressure relief vent structure of claim 2, wherein, Both sides of the beam are provided with exhaust ports, the exhaust ports correspond to the explosion-proof valves one by one, and the explosion-proof valves on the cell monomers are arranged in communication with the exhaust passages in the beam through the exhaust ports. The side wall of the box is provided with a passage, the exhaust passage communicates the exhaust port and the passage in the side wall of the box, and the passage in the side wall of the box is connected to the outside of the box.

4. The battery pack pressure relief vent structure of claim 2, wherein, The cell monomer is at least two, the cell monomer is arranged along the length direction of the cell monomer, and the length direction of the cell monomer is perpendicular to the beam.

5. The battery pack pressure relief vent structure of claim 3, wherein, The exhaust ports located on the same side of the beam are distributed along the length direction of the beam, and adjacent two exhaust ports are arranged alternately.

6. The battery pack pressure relief vent structure of claim 5, wherein, Both ends of the beam are provided with longitudinal beams, and the exhaust passage communicates with the passage in the side wall of the box through the longitudinal beams.

7. The battery pack pressure relief vent structure of claim 6, wherein, The bottom of the box is provided with a groove, the upper part of the groove is connected with the beam, and both ends of the groove are communicated with the longitudinal beams.

8. The battery pack pressure relief vent structure of claim 1, wherein, One end of the cell monomer away from the beam is provided with a pole.

9. The battery pack pressure relief vent structure of claim 8, wherein, The cell monomer also includes a voltage sampling point, and the voltage sampling point and the pole are arranged on the same side of the cell monomer.

10. The battery pack pressure relief vent structure of claim 1, wherein, The beam is also provided with a plurality of reinforcing beams.

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