CN220710547U - Battery pack - Google Patents

Abstract

The application belongs to the technical field of batteries, and provides a battery pack, which comprises: the box body comprises a bottom plate; the battery stack is accommodated in the box body and comprises a plurality of battery cells, and each battery cell comprises a pressure release end provided with a battery cell explosion-proof valve; the battery stack is arranged on the first side, the pressure release end of the battery core is connected with the first side, a pressure release hole corresponding to the battery core explosion-proof valve is formed in the support, and the second side of the support is connected with the bottom plate of the box body; the bottom plate is provided with first recess in one side of being connected with the second side, first recess with the pressure release hole intercommunication, and extend along first direction to the tip of support. The utility model discloses a can effectively reduce the exhaust structure and occupy at the inside space of battery package, effectively reduce the design and the arrangement degree of difficulty of thermal runaway exhaust route, be favorable to reducing the overall height of battery package.

Description

Battery pack

Technical Field

The application relates to the technical field of batteries, in particular to a battery pack.

Background

The battery thermal runaway refers to the fact that the internal temperature of the battery is rapidly increased, and then the problems of heat release, gas generation, electrolyte leakage and the like are caused, so that the battery explosion, fire disaster and even personal injury can be caused, and in the equipment such as an electric automobile and the like which need battery energy supply, in order to improve the energy density, the batteries need to be intensively installed to form a battery pack, and the batteries in the battery pack are densely distributed, so that the thermal runaway protection measure is more critical.

In the existing battery pack structure, considering that the gas generated by the thermal runaway of the battery needs to be discharged in time, the inside of the battery pack needs to be provided with a channel structure for the thermal runaway exhaust alone, or a component for integrally installing the battery is provided with an additional channel structure, but the existing channel structure needs to occupy arrangement space, the arrangement positions of the battery and other components are squeezed in the height direction of the battery pack, the design and arrangement difficulty of an exhaust path are increased, and the overall height of the battery pack is easily increased.

Disclosure of Invention

In view of the above drawbacks of the prior art, an object of the present application is to provide a battery pack, which is used for solving the problem that in the prior art, a thermal runaway exhaust channel structure inside the battery pack needs to occupy an arrangement space, and the arrangement positions of the battery and other components are squeezed in the height direction of the battery pack, so that the design and arrangement difficulty of an exhaust path are increased, and the overall height of the battery pack is easily increased.

To achieve the above and other related objects, the present application provides a battery pack comprising:

the box body comprises a bottom plate;

the battery stack is accommodated in the box body and comprises a plurality of battery cells, and each battery cell comprises a pressure release end provided with a battery cell explosion-proof valve;

the battery stack is arranged on the first side, the pressure release end of the battery core is connected with the first side, a pressure release hole corresponding to the battery core explosion-proof valve is formed in the support, and the second side of the support is connected with the bottom plate of the box body;

the bottom plate is provided with first recess in one side of being connected with the second side, first recess with the pressure release hole intercommunication, and extend along first direction to the tip of support.

Further, the bottom plate is provided with a plurality of first grooves along the second direction at intervals, and each first groove is respectively communicated with a plurality of pressure relief holes to form a plurality of first exhaust channels which are distributed at intervals.

Further, the box includes edge beam and the baffle that extends along the second direction, the baffle is located the bottom plate top in first direction, the baffle cross-over connection in between the edge beam with the support, the baffle with the hookup location of support includes the first side of support, perhaps the second side of support with between the bottom plate, the baffle with the space that surrounds between the bottom plate forms the second exhaust passage, a plurality of first exhaust passage converges to the second exhaust passage.

Further, the partition is connected to a first side of the support, and the support is provided with a second groove on the second side, which is matched with the first groove, and the second groove forms a part of the first exhaust passage.

Further, the first direction is perpendicular to the second direction.

Further, at least two second exhaust channels are formed in the box body, the two second exhaust channels are respectively located at two opposite ends of the box body, two ends of the first grooves extend to the end parts of the support, and the first exhaust channels are simultaneously communicated to the second exhaust channels at two opposite ends of the box body.

Further, the second exhaust passage penetrates through the box body along the arrangement direction, side exhaust ports are formed in two ends of the second exhaust passage, and a box body explosion-proof valve for closing the side exhaust ports is further arranged on the box body.

Further, a positioning groove is formed in one side, connected with the second side, of the bottom plate, and a positioning protrusion matched with the positioning groove is arranged on the second side of the support.

Further, a protective layer is arranged in the first groove.

Further, the protective layer is arranged on the bottom wall of the first groove, and the laying area of the protective layer corresponds to the position where the first exhaust channel is communicated with the pressure relief hole.

To sum up, the battery pack provided by the application has the following beneficial effects:

utilize the box of battery package as the structure base member of inside exhaust route, through set up first recess on the bottom plate of box, the pressure release hole on the cooperation support forms the complete exhaust route under the thermal runaway operating mode of battery pile, can effectively reduce the exhaust structure and occupy at the space of battery package inside, effectively reduce the design of thermal runaway exhaust route and arrange the degree of difficulty, be favorable to reducing the overall height of battery package.

Drawings

FIG. 1 is an isometric view of a battery pack according to an exemplary embodiment of the present application;

fig. 2 is an exploded view of a battery pack according to an exemplary embodiment of the present application;

FIG. 3 is a top view of a battery pack according to an exemplary embodiment of the present application;

fig. 4 is a schematic structural view of a bottom plate of a battery pack according to an exemplary embodiment of the present application;

fig. 5 is a schematic structural view of a holder of a battery pack according to an exemplary embodiment of the present application;

FIG. 6 is a partial cross-sectional view of a battery pack shown in an exemplary embodiment of the present application in the B-B direction of FIG. 3;

fig. 7 is a bottom partial enlarged view of a section of a battery pack in the B-B direction of fig. 3 according to an exemplary embodiment of the present application;

FIG. 8 is a partial cross-sectional view of a battery pack shown in an exemplary embodiment of the present application in the direction A-A of FIG. 3;

fig. 9 is another partial sectional view of a battery pack in the direction A-A of fig. 3, according to an exemplary embodiment of the present application.

Fig. 10 is an exploded view of a battery pack according to another exemplary embodiment of the present application;

fig. 11 is an isometric view of a battery pack according to another exemplary embodiment of the present application;

FIG. 12 is a partial cross-sectional view of a battery pack shown in another exemplary embodiment of the present application in the C-C direction of FIG. 11;

description of the part reference numerals

1-a cell stack; 11-an electric core; 111-an explosion-proof valve with an electric core;

2-a box body; 21-a bottom plate; 211-a first groove; 2111-protective layer; 212-positioning grooves; 22-side beams; 221-a box explosion-proof valve; 23-a separator; 231-a second exhaust passage;

3-supporting seats; 31-a pressure relief hole; 32-positioning protrusions;

4-viscose.

Detailed Description

Further advantages and effects of the present application will be readily apparent to those skilled in the art from the present disclosure, by describing the embodiments of the present application with specific examples.

It should be understood that the structures, proportions, sizes, etc. shown in the drawings are shown only in connection with the present disclosure, and are therefore not intended to limit the scope of the utility model, which is defined by the claims, but are not to be limited to the specific details disclosed herein. Also, the terms "front", "back", "left", "right", "middle" and "first", "second" are used herein for descriptive purposes only and are not intended to limit the scope of the present application to which the present application may be applied, but rather to modify or adapt the relative relationship without materially altering the technical context.

In one embodiment, the present application exemplarily shows a battery pack, referring to fig. 1-9, the battery pack at least includes a case 2, a battery stack 1 accommodated in the case 2, and a support 3, wherein the structures of the respective parts are as follows:

the case 2 is a container for intensively accommodating the plurality of battery cells 11, and can be understood as a case of a battery pack, the case 2 includes a bottom plate 21, and the bottom plate 21 may be a bottom of the case 2 or may be a plate structure laid at an inner bottom end of the case 2 for placing and mounting the battery stack 1.

The battery stack 1 is formed by combining a plurality of single battery cells 11, the battery stack 1 comprises a plurality of battery cells 11, each battery cell 11 comprises a pressure release end, the pressure release end is provided with a battery cell explosion-proof valve 111, please refer to fig. 6 and 7, fig. 6 and 7 exemplarily show the installation positions of the battery cell explosion-proof valves 111, and the battery cell explosion-proof valves 111 are of a common structure on the battery cells 11, so that only the schematic is made for facilitating understanding of the structural relationship, and in different embodiments, the structure of the battery cell explosion-proof valves 111 can be different, and the battery cell explosion-proof valves 111 are used for opening pressure release when the battery cells 11 are out of control.

The support 3 is used for centralized installation of a plurality of electric cells 11 in the cell stack 1, please refer to fig. 2 and 5, the support has a first side and a second side opposite to each other, the first side is a side for centralized installation of the electric cells 11, the second side is a side connected with the bottom plate 21, the pressure release ends of the electric cells 11 are connected with the first side of the support 3, so that the cell stack 1 is formed on the first side, the support 3 is provided with pressure release holes 31 corresponding to the electric cell explosion-proof valves 111, the second side of the support 3 is connected with the bottom plate 21 of the box 2, that is, the cell stack 1 is installed on the bottom plate 21 through the support 3, and thus is fixed inside the box 2.

In this embodiment, referring to fig. 4, a first groove 211 is disposed on one side of the bottom plate 21 connected to the second side, the first groove 211 is communicated with the pressure release hole 31 and extends to the end of the support 3 along the first direction, when the battery cell explosion-proof valve 111 is triggered to open due to thermal runaway of the battery cell 11, the gas ejected from the battery cell 11 can enter the first groove 211 through the pressure release hole 31 and be discharged laterally outwards through the first groove 211, so as to avoid affecting the battery stack 1, and the thickness of the support 3 can be reduced as much as possible under the premise of ensuring the installation of the battery cell 11 due to the first groove 211 being disposed on the bottom plate 21, so that a plate structure with the pressure release hole 31 is formed.

In the above embodiment, the box 2 of the battery pack is used as the structural substrate of the internal exhaust path, and the first groove 211 is formed on the bottom plate 21 of the box 2, so that the complete exhaust path under the thermal runaway condition of the battery stack 1 is formed by matching with the pressure release hole 31 on the support 3, the space occupation of the exhaust structure in the battery pack can be effectively reduced, the design and arrangement difficulty of the thermal runaway exhaust path can be effectively reduced, and the overall height of the battery pack can be reduced.

It should be noted that, in the above embodiment, the pressure relief hole 31 corresponds to the cell explosion-proof valve 111, it should be understood that the pressure relief hole 31 provides a space for buffering and pressure relief in the direction of pressure relief of the explosion-proof valve, rather than defining the shape and size of the pressure relief hole 31 to be completely consistent with those of the explosion-proof valve, in some embodiments, the pressure relief hole 31 may be a single round hole, in other embodiments, the pressure relief holes 31 may also be long holes that are mutually communicated, and when the plurality of pressure relief holes 31 are communicated to form a long hole, the pressure relief hole 31 may not be a through hole, and the manner of communicating with the first groove 211 may be to form a through hole at the bottom of the long hole, where the through hole enables the first groove 211 to be indirectly communicated with the pressure relief hole 31.

In this embodiment, the first direction is also the arrangement direction of the battery cells 11, the plurality of battery cells 11 are arranged in rows along the first direction, and the plurality of battery cells 11 are arranged in groups along the second direction.

In this embodiment, the first grooves 211 are disposed at intervals in the second direction, each first groove 211 is respectively communicated with the plurality of pressure release holes 31 to form a plurality of first exhaust passages arranged at intervals, the plurality of exhaust paths are favorable for shortening the length of a single exhaust path, meeting the nearby exhaust requirement of each pressure release hole 31, ensuring the exhaust efficiency, and reducing the interference generated between the exhaust of the plurality of pressure release holes 31.

In this embodiment, referring to fig. 8 and 9, the case 2 includes the side sill 22 and the partition 23 extending in the second direction, the partition 23 is located above the base plate 21, in the first direction, the partition 23 spans between the side sill 22 and the support 3, the space surrounded between the partition 23 and the base plate 21 forms the second exhaust passage 231, and the plurality of first exhaust passages converge to the second exhaust passage 231, it should be understood that in the above-described structure, the second exhaust passage 231 formed by the space surrounded between the partition 23 and the base plate 21 is relatively closed inside the case 2 and communicates with only the first exhaust passage, so that in the first direction, one end of the partition 23 is connected to the side sill 22, the other end is connected to the support 3, and the partition 23 is located above the connection position of the first exhaust passage and the second exhaust passage 231 at the end connected to the support 3, so as to block the exhaust path in the space between the partition 23 and the base plate 21.

In the above embodiment, in the present embodiment, the connection position between the partition 23 and the support 3 is the first side of the support 3, that is, the end of the partition 23 is attached to the support 3 and covers the edge of the support 3, so that the first exhaust channel below the support 3 is blocked from the space above the partition 23 and is communicated with the second exhaust channel 231 below the partition 23.

Further, the first direction is perpendicular to the second direction, specifically, in this embodiment, the first direction is, for example, a length direction of the battery pack, and the second direction is, for example, a width direction of the battery pack.

In the present embodiment, the connection position of the partition 23 and the support 3 is between the second side of the support 3 and the bottom plate 21, that is, the end of the partition 23 is clamped between the edge of the support 3 and the upper surface of the bottom plate 21, and since the first exhaust passage is provided on the upper surface of the bottom plate 21 at this time, the partition 23 is capped over the first exhaust passage so as to communicate with the second exhaust passage 231 under the partition 23.

In this embodiment, at least two second exhaust channels 231 are formed and are respectively located at two opposite ends of the box 2, two ends of the plurality of first grooves 211 extend to the ends of the support 3, and the plurality of first exhaust channels are simultaneously communicated to the second exhaust channels 231 at two opposite ends of the box 2, so that the pressure release holes 31 are communicated with the two second exhaust channels 231, and exhaust can be simultaneously performed from two ends of the box 2, which is beneficial to ensuring exhaust efficiency.

Further, in this embodiment, the second exhaust channels 231 penetrate the case 2 along the setting direction, the case 2 is provided with side exhaust ports at two ends of the second exhaust channels 231, and on the basis that the pressure release holes 31 are communicated with two second exhaust channels 231, two ends of each second exhaust channel 231 are respectively communicated with one side exhaust port on the case 2, so that exhaust can be simultaneously performed from four side exhaust ports, which is beneficial to further improving exhaust efficiency, in this embodiment, the case 2 is further provided with a case explosion-proof valve 221 for closing the side exhaust ports, the case explosion-proof valve 221 is different from the battery core explosion-proof valve 111 on the battery core 11, the case explosion-proof valve 221 performs exhaust based on the air pressure in the second exhaust channels 231, and is beneficial to avoiding excessive accumulation of air pressure in the second exhaust channels 231 while closing the second exhaust channels 231.

In this embodiment, the bottom plate 21 is provided with a positioning groove 212 on a side connected with the second side of the support 3, a positioning protrusion 32 matching with the positioning groove 212 is provided on the second side of the support 3, and when the support 3 is mounted and connected with the bottom plate 21, the positioning protrusion 32 can be inserted into the positioning groove 212 to perform positioning, so as to improve the convenience and accuracy of mounting and positioning, in this embodiment, the positioning groove 212 is an elongated groove parallel to the first grooves 211, that is, the positioning groove 212 is opened on a protruding portion between the two first grooves 211 along the first direction.

In this embodiment, the protection layer 2111 is disposed in the first groove 211, the protection layer 2111 may be a thin layer or a thin plate structure with fireproof and fireproof characteristics, such as a mica plate, etc., the protection layer 2111 is disposed at least on the bottom wall of the first groove 211, and the laying area of the protection layer 2111 corresponds to the position where the first exhaust channel is communicated with the pressure release hole 31, in some application scenarios, when the explosion-proof valve 111 of the electric core is triggered to open, high-temperature and high-pressure gas is sprayed into the electric core 11, even the electrolyte in a high-temperature molten state or the content of the electric core 11 with flame, and when the electrolyte is impacted into the first groove 211 through the pressure release hole 31, the electrolyte will impact on the protection layer 2111 located on the bottom wall of the first groove 211 at first, so as to avoid the bottom plate 21 of the box 2 from being directly impacted by the high-temperature gas or liquid, and reduce the risk of the deformation of the first groove 211 due to high-temperature damage in the pressure release process.

In another embodiment, the first direction and the second direction can be adjusted as required, referring to fig. 10-12, the first direction is, for example, the width direction of the battery pack, the second direction is, for example, the length direction of the battery pack, the partition 23 is connected above the support 3, that is, the partition 23 is connected with the first side of the support 3, so that the second side of the support 3 is located below the partition 23, and in this embodiment, the support 3 is further provided with a second groove on the second side, which is matched with the first groove 211, and forms a part of the first exhaust channel, so as to facilitate enlarging the cross-sectional area of the first exhaust channel, improving the exhaust flux, and ensuring the exhaust effect.

In the above embodiment, the connection between the battery cell 11 and the holder 3, between the holder 3 and the base plate 21, between the separator 23 and the holder 3, and between the separator 23 and the base plate 21, and other structural members can be made by, for example, bonding with the adhesive 4, and the thickness of the bonding layer formed between the two members by the adhesive 4 is extremely small, so that the original mounting positional relationship of each member is not affected.

To sum up, in the battery pack provided by the application, the box body 2 of the battery pack is utilized as the structural substrate of the internal exhaust path, the first groove 211 is arranged on the bottom plate 21 of the box body 2, the pressure release hole 31 on the support 3 is matched with the complete exhaust path under the thermal runaway working condition of the battery stack 1, the space occupation of the exhaust structure in the battery pack can be effectively reduced, the design and arrangement difficulty of the thermal runaway exhaust path can be effectively reduced, and the overall height of the battery pack can be reduced.

The above embodiments are merely illustrative of the principles of the present application and its effectiveness and are not intended to limit the present application. Modifications and variations may be made to the above-described embodiments by those of ordinary skill in the art without departing from the spirit and scope of the present application. It is therefore contemplated that the appended claims will cover all such equivalent modifications and changes as fall within the true spirit and scope of the disclosure.

Claims (10)

1. A battery pack, comprising:

the box body comprises a bottom plate;

the battery stack is accommodated in the box body and comprises a plurality of battery cells, and each battery cell comprises a pressure release end provided with a battery cell explosion-proof valve;

the battery stack is arranged on the first side, the pressure release end of the battery core is connected with the first side, a pressure release hole corresponding to the battery core explosion-proof valve is formed in the support, and the second side of the support is connected with the bottom plate of the box body;

the bottom plate is provided with first recess in one side of being connected with the second side, first recess with the pressure release hole intercommunication, and extend along first direction to the tip of support.

2. The battery pack according to claim 1, wherein the bottom plate is provided with a plurality of first grooves at intervals along the second direction, and each of the first grooves is respectively communicated with a plurality of the pressure release holes to form a plurality of first exhaust passages arranged at intervals.

3. The battery pack according to claim 2, wherein the case includes a side rail extending in the second direction and a partition plate located above the bottom plate, the partition plate bridging between the side rail and the support in the first direction, a connection position of the partition plate and the support including a first side of the support or a second side of the support and the bottom plate, a space surrounded between the partition plate and the bottom plate forming a second exhaust passage, and a plurality of the first exhaust passages merging to the second exhaust passage.

4. A battery pack according to claim 3, wherein the separator is connected to a first side of the support, the support being provided with a second recess on the second side which cooperates with the first recess, the second recess forming part of the first vent passage.

5. The battery pack of claim 2, wherein the first direction is perpendicular to the second direction.

6. A battery pack according to claim 3, wherein at least two second exhaust passages are formed in the case, the two second exhaust passages are respectively located at opposite ends of the case, the plurality of first grooves extend to the ends of the support, and the plurality of first exhaust passages are simultaneously connected to the second exhaust passages at opposite ends of the case.

7. The battery pack according to claim 3, wherein the second exhaust passage penetrates the case in the arrangement direction, the case is provided with side exhaust ports at both ends of the second exhaust passage, and a case explosion-proof valve for closing the side exhaust ports is further provided on the case.

8. The battery pack according to claim 1, wherein the bottom plate is provided with a positioning groove on a side connected to the second side, and the second side of the holder is provided with a positioning protrusion fitted with the positioning groove.

9. The battery pack of claim 2, wherein a protective layer is disposed within the first recess.

10. The battery pack of claim 9, wherein the protective layer is disposed on a bottom wall of the first recess, and a laying area of the protective layer corresponds to a position where the first exhaust passage communicates with the pressure release hole.