Battery pack

Abstract

A battery pack, comprising a case (100), a battery cell module (200), a bottom protection plate (300), and a reinforcing rib plate (400). The case (100) and the bottom protection plate (300) define an accommodating space for accommodating the battery cell module (200). The reinforcing rib plate (400) comprises at least one reinforcing convex rib (401), the reinforcing rib plate (400) is attached to the bottom protection plate (300), and the reinforcing convex rib (401) protrudes towards the side facing away from the bottom protection plate (300), so that a gas discharge channel is defined between the reinforcing convex rib (401) and the bottom protection plate (300). At least one row of first explosion-proof valves (2011) are arranged at the bottom of the battery cell module (200), the battery cell module (200) is arranged on the reinforcing rib plate (400), and each reinforcing convex rib (401) corresponds to one row of first explosion-proof valves (2011). The case (100) comprises a gas discharge part (601), and the first explosion-proof valves (2011) are in communication with the gas discharge part (601) via the gas discharge channel. According to the battery pack, pressure relief gas discharged by means of the first explosion-proof valves (2011) is prevented from impacting the battery cell module (200), thereby ensuring the stability of electrical connection of the battery cell module (200); and the pressure relief gas can be directly discharged to the gas discharge part (601) by means of the gas discharge channel, thereby improving the discharging speed of the pressure relief gas.

Description

battery pack

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on June 28, 2023, with application number 202321679432.0 and invention name “Battery Pack”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the technical field of lithium batteries, and in particular to a battery pack. Background Art

[0004] With the rise of new energy vehicles, there are many different opinions on battery pack design, and the safety design of battery packs has become a hot topic of research. Among them, the most popular topic is the thermal runaway safety of battery packs.

[0005] In this regard, traditional battery cell explosion-proof valves are all installed on the top or side of the battery cell module, and there is no separate exhaust channel on the top or side of the battery pack for gas circulation. The large area of ​​gas in the battery pack will not only affect the poles of the battery module, but the gas discharged from the battery cell explosion-proof valve will be discharged to the outside of the battery pack at a slow speed.

[0006] Therefore, the existing battery pack structure not only fails to achieve thermal and electrical separation, but also has slow exhaust.

[0007] Summary of the Invention

[0008] The purpose of this application is to provide a battery pack to solve, to a certain extent, the technical problem that the existing battery pack structure in the prior art not only fails to achieve thermal and electrical separation but also has slow exhaust.

[0009] According to a first aspect of the present application, a battery pack is provided, comprising a housing, a battery cell module, a bottom guard plate, and a reinforcing rib plate, wherein the housing and the bottom guard plate together enclose a space for accommodating the battery cell module;

[0010] The reinforcing rib plate includes at least one reinforcing rib, the reinforcing rib plate is in contact with the bottom guard plate, and the reinforcing rib protrudes toward a side facing away from the bottom guard plate, so that an exhaust passage is formed between the reinforcing rib and the bottom guard plate;

[0011] At least one row of first explosion-proof valves is provided at the bottom of the battery cell module, the battery cell module is provided on the reinforcing rib plate, and each reinforcing rib is provided corresponding to a row of first explosion-proof valves;

[0012] The housing includes an exhaust portion, and the first explosion-proof valve is in communication with the exhaust portion via the exhaust passage.

[0013] Optionally, the reinforcing rib plate includes a plurality of reinforcing ribs spaced apart along a first direction, each reinforcing rib extending along a second direction, and the second direction is perpendicular to the first direction;

[0014] The reinforcing rib is provided with a vent portion, and the first explosion-proof valve is connected to the exhaust channel via the vent portion;

[0015] Each of the reinforcing ribs is provided with two support bars extending along the second direction, the vent portion is provided between the two support bars, and the battery cell module is provided on the reinforcing rib via the support bars.

[0016] Optionally, the reinforcing rib plate further comprises a plate main portion, a plurality of the reinforcing ribs are connected via the plate main portion, and the reinforcing rib plate is attached to the bottom guard plate via the plate main portion;

[0017] The battery pack further includes a sealing adhesive layer disposed between the plate body and the bottom guard plate.

[0018] Optionally, the shell further includes a front side beam, a rear side beam, an air-through cross beam and two side beams, the rear side beam and the air-through cross beam both extend along the first direction, the side beams extend along a second direction, the first ends of the two side beams are respectively connected to the two ends of the front side beam, the second ends of the two side beams are respectively connected to the two ends of the rear side beam, and the second direction is perpendicular to the first direction;

[0019] The air beam includes a first cavity extending along the first direction, the side beam includes a second cavity extending along the second direction, the exhaust portion is arranged on the rear side beam, and the exhaust channel is connected to the exhaust portion via the first cavity and the second cavity in sequence.

[0020] Optionally, the reinforcing rib further includes a communicating hole communicating with the exhaust passage, the air beam cover is provided above the communicating hole, and the exhaust passage is communicated with the first cavity via the communicating hole.

[0021] Optionally, the vent portion includes a plurality of vent holes spaced apart along the second direction, and the plurality of vent holes included in each of the reinforcing ribs correspond one-to-one to the plurality of first explosion-proof valves in a corresponding row.

[0022] Optionally, the battery cell module includes a plurality of battery cell assemblies arranged side by side along a first direction, each of the battery cell assemblies includes a plurality of battery cells stacked along the second direction, and the poles of the battery cells are arranged on the end faces of the battery cells in the first direction.

[0023] Optionally, it further includes a longitudinal beam extending along the second direction, wherein the longitudinal beam divides the accommodating space into a plurality of accommodating parts, and each of the accommodating parts is correspondingly provided with one of the battery cell assemblies.

[0024] Optionally, the battery cell further includes a second explosion-proof valve, and the second explosion-proof valve is provided on an end face of the battery cell in the first direction;

[0025] The longitudinal beam includes a third cavity and a first air hole, the third cavity extending along the second direction, the first air hole being provided on two opposite sides of the longitudinal beam in the first direction, and the second explosion-proof valve of the battery cell facing the longitudinal beam being provided corresponding to the first air hole;

[0026] The side beam further includes a second air hole, which is arranged on the inner side of the side beam. The second explosion-proof valve of the battery cell facing the side beam is arranged corresponding to the second air hole.

[0027] Optionally, the invention further comprises a front crossbeam and a rear crossbeam both extending along the first direction, and the battery cell module is arranged between the front crossbeam and the rear crossbeam;

[0028] The rear cross beam further includes a fourth cavity and an exhaust hole extending along the first direction, and the second cavity and the third cavity are both connected to the exhaust portion via the fourth cavity and the exhaust hole in sequence.

[0029] Compared with the prior art, the present invention has the following advantages:

[0030] The battery pack provided in the present application connects the first explosion-proof valve with the exhaust channel enclosed by the reinforcing rib and the bottom guard plate, so that the space enclosed by the reinforcing rib and the bottom guard plate is utilized as an independent exhaust channel. When the air pressure inside the battery cell module exceeds a threshold value, the pressure-relief gas can rush out of the first explosion-proof valve and be discharged into the exhaust channel. On the one hand, the pressure-relief gas discharged through the first explosion-proof valve is effectively prevented from impacting the battery cell module, thereby ensuring the electrical connection stability of the battery cell module. On the other hand, the pressure-relief gas can be directly discharged to the exhaust part through the exhaust channel, thereby effectively improving the exhaust speed of the pressure-relief gas.

[0031] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0033] FIG1 is a schematic diagram of an exploded structure of a battery pack provided in an embodiment of the present application;

[0034] FIG2 is a schematic diagram of the structure of the reinforcing rib plate installed on the bottom guard plate according to an embodiment of the present application;

[0035] FIG3 is a side view of FIG2;

[0036] FIG4 is an enlarged structural diagram at point A of FIG3 ;

[0037] FIG5 is a schematic diagram of the battery cell module structure provided in an embodiment of the present application.

[0038] Reference numerals:

[0039] 100-housing; 200-cell module; 201-cell assembly; 2011-first explosion-proof valve; 2012-second explosion-proof valve; 300-bottom guard plate; 400-reinforcement rib plate; 401-reinforcement rib; 4011-vent; 4012-connecting hole; 402-board body; 500-sealant layer; 601-exhaust section; 602-front side member; 603-rear side member; 604-air cross member; 605-side member; 6051-second air hole; 700-front cross member; 800-rear cross member; 801-exhaust hole; 900-longitudinal member; 901-first air hole; 1000-cold plate;

[0040] X-first direction; Y-second direction; Z-third direction. DETAILED DESCRIPTION

[0041] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0042] The components of the embodiments of the present application generally described and shown in the drawings herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the present application.

[0043] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0044] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0045] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0046] The battery pack according to some embodiments of the present application is described below with reference to FIG. 1 to FIG. 5 .

[0047] Referring to Figures 1 to 5 , an embodiment of the present application provides a battery pack comprising a housing 100, a cell module 200, a bottom guard plate 300, and a reinforcing rib plate 400. The housing 100 and the bottom guard plate 300 together form a housing for accommodating the cell module 200. The reinforcing rib plate 400 includes a plurality of reinforcing ribs 401 spaced apart along a first direction X. The reinforcing rib plate 400 is in contact with the bottom guard plate 300, with the reinforcing ribs 401 protruding toward the side facing away from the bottom guard plate 300 to form an exhaust passage between the reinforcing ribs 401 and the bottom guard plate 300. Multiple rows of first explosion-proof valves 2011 are provided at the bottom of the cell module 200. The cell module 200 is mounted on the reinforcing rib plate 400, with the multiple reinforcing ribs 401 corresponding to the multiple rows of first explosion-proof valves 2011. The housing 100 includes an exhaust portion 601 , and the first explosion-proof valve 2011 is in communication with the exhaust portion 601 via an exhaust passage.

[0048] According to the above technical features, the first explosion-proof valve 2011 is connected to the exhaust channel enclosed by the reinforcing rib 401 and the bottom guard plate 300, so that the space enclosed by the reinforcing rib 401 and the bottom guard plate 300 is utilized as an independent exhaust channel. When the air pressure inside the battery module 200 exceeds the threshold value, the depressurized gas can rush out of the first explosion-proof valve 2011 and be discharged into the exhaust channel. On the one hand, the depressurized gas discharged through the first explosion-proof valve 2011 is effectively prevented from impacting the battery module 200, thereby ensuring the electrical connection stability of the battery module 200. On the other hand, the depressurized gas can be directly discharged to the exhaust part 601 through the exhaust channel, thereby effectively improving the exhaust speed of the depressurized gas.

[0049] Referring to Figure 1 , X illustrates an example of a first direction, Y illustrates an example of a second direction, and Z illustrates an example of a third direction. Optionally, any two of the first direction X, the second direction Y, and the third direction Z are perpendicular. When the battery pack is in use, the third direction Z may be parallel to the direction of gravity.

[0050] Optionally, as shown in Figures 1 and 2, the reinforcing rib 401 extends along the second direction Y. The reinforcing rib 401 is provided with a vent, and the first explosion-proof valve 2011 is connected to the exhaust channel via the vent. Each reinforcing rib 401 is provided with two support bars extending along the second direction Y. The vent is provided between the two support bars, and the battery cell module 200 is provided on the reinforcing rib 401 via the support bars. In this way, the two support bars provided on both sides of the vent effectively seal the first explosion-proof valve 2011 from the exhaust channel, preventing the depressurized gas discharged from the first explosion-proof valve 2011 from completely entering the exhaust channel, further improving the completeness of the electric and thermal separation.

[0051] Optionally, as shown in Figure 1, the ventilation portion may include a plurality of ventilation holes 4011 spaced apart along the second direction Y, and the plurality of ventilation holes 4011 included in each reinforcing rib 401 correspond one-to-one to a plurality of first explosion-proof valves 2011 in a corresponding row. In this way, each explosion-proof valve can be connected to the exhaust channel, ensuring the smoothness of pressure relief of each first explosion-proof valve 2011.

[0052] Optionally, the support strips may be support foams, which, under the elastic action of the support foams, effectively prevent the pressure relief gas from rushing out of the first explosion-proof valve 2011 and vibrating the battery cell module 200 at the pressure relief gas release location, causing the pressure relief gas to enter the above-mentioned accommodation space.

[0053] Optionally, as shown in FIG4 , the ribbed plate 400 may further include a plate body 402, through which the plurality of reinforcing ribs 401 are connected, and the ribbed plate 400 is bonded to the bottom guard plate 300 via the plate body 402. The battery pack may further include a sealant layer 500 disposed between the plate body 402 and the bottom guard plate 300. This further improves the airtightness of the exhaust passage and prevents depressurized gas in the exhaust passage from escaping through the gap between the plate body 402 and the bottom guard plate 300.

[0054] Optionally, as shown in FIG1 , the housing 100 may further include a front side beam 602, a rear side beam 603, an air-passing cross beam 604, and two side beams 605. The rear side beam 603 and the air-passing cross beam 604 both extend along the first direction X, and the side beams 605 extend along the second direction Y. The first ends of the two side beams 605 are respectively connected to the two ends of the front side beam 602, and the second ends of the two side beams 605 are respectively connected to the two ends of the rear side beam 603. The air-passing cross beam 604 includes a first cavity extending along the first direction X, and the side beams 605 include a second cavity extending along the second direction Y. The exhaust portion 601 is provided on the rear side beam 603, and the exhaust passage is connected to the exhaust portion 601 via the first cavity and the second cavity in sequence.

[0055] Optionally, as shown in Figure 2, the reinforcing rib 401 also includes a connecting hole 4012 connected to the exhaust channel, and the above-mentioned air beam 604 is covered above the connecting hole 4012. The exhaust channel is connected to the first cavity via the connecting hole 4012 to achieve communication between the exhaust channel and the air beam 604.

[0056] In an embodiment, as shown in Figures 1 and 5, the battery cell module 200 may include a plurality of battery cell assemblies 201 arranged side by side along a first direction X, each battery cell assembly 201 includes a plurality of battery cells stacked along a second direction Y, and the poles of the battery cells are arranged on the end faces of the battery cells in the first direction X. In this way, the poles and the first explosion-proof valve 2011 are arranged on different surfaces of the battery cells, further realizing the separation of electricity and heat.

[0057] Optionally, as shown in Figure 1, the battery pack may further include a longitudinal beam 900 extending along the second direction Y, and the longitudinal beam 900 divides the accommodating space into multiple accommodating parts, and each accommodating part corresponds to a battery cell assembly 201. On the one hand, the strength of the battery pack shell 100 is effectively improved; on the other hand, the battery cell assemblies 201 are effectively separated, and the mutual interference of the battery cell assemblies 201 is effectively reduced.

[0058] In an embodiment, as shown in Figures 1 and 5, the battery cell may further include a second explosion-proof valve 2012, which is arranged on the end face of the battery cell in the first direction X. In this way, the pressure relief outlet of the battery is effectively increased, the safety of the battery cell is further ensured, and the probability of deformation of the battery cell due to untimely pressure relief is effectively reduced.

[0059] Optionally, as shown in Figure 1, the above-mentioned longitudinal beam 900 may include a third cavity and a first air hole 901, the third cavity extends along the second direction Y, and the first air hole 901 is arranged on two sides of the longitudinal beam 900 opposite to each other in the first direction X. The second explosion-proof valve 2012 of the battery cell facing the longitudinal beam 900 is arranged corresponding to the first air hole 901. In this way, the pressure relief gas of the second explosion-proof valve 2012 arranged facing the longitudinal beam 900 is directly discharged from the third cavity, thereby reducing the probability of the pressure relief gas discharged through the second explosion-proof valve 2012 impacting the electrical connection structure of the battery cell module 200.

[0060] Optionally, as shown in Figure 1, the side beam 605 may also include a second air hole 6051, which is arranged on the inner side of the side beam 605, and the second explosion-proof valve 2012 of the battery cell facing the side beam 605 is arranged corresponding to the second air hole 6051. In this way, the pressure relief gas of the second explosion-proof valve 2012 arranged facing the side beam 605 is directly discharged from the second cavity, thereby reducing the probability of the pressure relief gas discharged through the second explosion-proof valve 2012 impacting the electrical connection structure of the battery cell module 200.

[0061] Optionally, as shown in Figure 1, the battery pack may also include a front beam 700 and a rear beam 800 both extending along the first direction X, and the battery cell module 200 is arranged between the front beam 700 and the rear beam 800, which effectively improves the deformation resistance of the battery pack and the setting stability of the battery cell module 200.

[0062] Optionally, as shown in Figure 1, the rear cross beam 800 may also include a fourth cavity and an exhaust hole 801 extending along the first direction X, and the second cavity and the third cavity are connected to the exhaust part 601 via the fourth cavity and the exhaust hole 801 in sequence. In this way, the depressurized gas is gathered to the exhaust hole 801 through the fourth cavity, and then flows to the exhaust part 601 through the exhaust hole 801, so as to control the discharge direction of the depressurized gas.

[0063] Optionally, as shown in Figure 1, the battery pack may further include a cold plate 1000, which is covered on top of the battery module 200. The cold plate 1000 is welded to the front crossbeam 700 and the rear crossbeam 800 respectively. On the one hand, the cold plate 1000, the bottom guard plate 300, the front crossbeam 700, the rear crossbeam 800 and the two side beams 605 form a closed space, thereby ensuring the environmental stability of the above-mentioned accommodation space and the smooth operation of the battery module 200; on the other hand, the cold air cooled by the cold plate 1000 flows to the entire battery pack, thereby improving the cooling efficiency of the cold plate 1000.

[0064] Optionally, the exhaust portion may be an explosion-proof valve provided on the housing 100 .

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery pack, characterized in that: It includes a shell, a battery module, a bottom guard plate and a reinforcing rib plate, wherein the shell and the bottom guard plate are arranged to form a storage space for accommodating the battery module; The reinforcing rib plate includes at least one reinforcing convex rib, the reinforcing rib plate is in contact with the bottom guard plate, and the reinforcing convex rib protrudes toward a side facing away from the bottom guard plate, so that an exhaust passage is formed between the reinforcing convex rib and the bottom guard plate; At least one row of first explosion-proof valves is arranged at the bottom of the battery module, the battery module is arranged on the reinforcing rib plate, and each reinforcing rib is arranged corresponding to a row of first explosion-proof valves; The housing includes an exhaust portion, and the first explosion-proof valve is in communication with the exhaust portion via the exhaust passage.

2. The battery pack according to claim 1, characterized in that: The reinforcing rib plate includes a plurality of reinforcing ribs spaced apart along a first direction, Each of the reinforcing ribs extends along a second direction, and the second direction is perpendicular to the first direction; The reinforcing convex rib is provided with a vent portion, and the first explosion-proof valve is connected with the exhaust passage via the vent portion; Each of the reinforcing ribs is provided with two support bars extending along the second direction, the vent is provided between the two support bars, and the battery cell module is provided on the reinforcing rib via the support bars.

3. The battery pack according to claim 1, characterized in that: The reinforcing rib plate also includes a plate main body, a plurality of reinforcing ribs are connected via the plate main body, and the reinforcing rib plate is attached to the bottom guard plate via the plate main body; The battery pack also includes a sealant layer arranged between the plate body and the bottom guard plate.

4. The battery pack according to claim 2, characterized in that: The shell further comprises a front side beam, a rear side beam, a transverse air beam and two side beams, the rear side beam and the transverse air beam both extend along the first direction, the side beams extend along the second direction, the first ends of the two side beams are respectively connected to the two ends of the front side beam, the second ends of the two side beams are respectively connected to the two ends of the rear side beam, and the second direction is perpendicular to the first direction; The air beam includes a first cavity extending along the first direction, the side beam includes a second cavity extending along the second direction, the exhaust portion is arranged on the rear side beam, and the exhaust channel is connected to the exhaust portion via the first cavity and the second cavity in sequence.

5. The battery pack according to claim 4, characterized in that: The reinforcing rib further includes a connecting hole connected to the exhaust passage, the air-passing cross beam cover is arranged above the connecting hole, and the exhaust passage is connected to the first cavity via the connecting hole.

6. The battery pack according to claim 2, characterized in that: The ventilation portion includes a plurality of ventilation holes arranged at intervals along the second direction, and the plurality of ventilation holes included in each of the reinforcing ribs correspond one-to-one to the plurality of first explosion-proof valves in a corresponding row.

7. The battery pack according to claim 4, characterized in that: The battery cell module includes a plurality of battery cell assemblies arranged side by side along a first direction, each of the battery cell assemblies includes a plurality of battery cells stacked along the second direction, and poles of the battery cells are arranged on end faces of the battery cells in the first direction.

8. The battery pack according to claim 7, characterized in that: It also includes a longitudinal beam extending along the second direction, wherein the longitudinal beam divides the accommodating space into a plurality of accommodating parts, and each of the accommodating parts is correspondingly provided with one of the battery cell assemblies.

9. The battery pack according to claim 8, characterized in that: The battery cell further includes a second explosion-proof valve, which is arranged on an end surface of the battery cell in the first direction; The longitudinal beam comprises a third cavity and a first air hole, the third cavity extends along the second direction, the first air hole is arranged on two sides of the longitudinal beam that are opposite to each other in the first direction, and the second explosion-proof valve of the battery cell facing the longitudinal beam is arranged corresponding to the first air hole; The side beam further includes a second air hole, which is arranged on the inner side of the side beam, and the second explosion-proof valve of the battery cell facing the side beam is arranged corresponding to the second air hole.

10. The battery pack according to claim 9, characterized in that: It also includes a front crossbeam and a rear crossbeam both extending along the first direction, and the battery cell module is arranged between the front crossbeam and the rear crossbeam; The rear cross beam further includes a fourth cavity and an exhaust hole extending along the first direction, and the second cavity and the third cavity are both connected to the exhaust portion via the fourth cavity and the exhaust hole in sequence.

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