Integrated explosion-proof assembly of battery pack and battery pack

Abstract

The utility model provides an integrated explosion-proof assembly of a battery pack and the battery pack, a box body is a plastic box body, the box body comprises a plurality of plate bodies, the plurality of plate bodies enclose an accommodating space, an explosion-proof valve elastic sheet is a metal elastic sheet, the explosion-proof valve elastic sheet is embedded on one of the plate bodies, and the explosion-proof valve elastic sheet and the plate bodies are integrally formed by injection molding. The surface, close to the containing space, of the anti-explosion valve elastic piece is provided with a connecting part in a protruding mode, the surface, away from the containing space, of the anti-explosion valve elastic piece is provided with an anti-explosion indentation, when thermal runaway happens to a battery cell in the battery pack, gas generated by the battery cell can instantly increase the air pressure in a battery pack box body, the anti-explosion indentation of the anti-explosion valve elastic piece is broken, and therefore the anti-explosion effect is achieved. And the explosion-proof valve can be opened for exhausting. The anti-explosion valve elastic piece is injected into the plastic box body in advance, the structure is simple, implementation is easy, the welding technology is not needed, the production reject ratio of products can be reduced, the failure risk of the anti-explosion valve is reduced, and the anti-explosion performance is excellent.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a battery pack integral type explosion -proof subassembly and battery pack. BACKGROUND

[0002] With the development of lithium battery technology, lithium battery application is more and more widely. When lithium ion battery pack occurs collision extrusion deformation or internal and external short circuit of battery pack, it is easy to cause cell thermal runaway, and harmful gas is produced rapidly in large quantities or even fire explosion, and the conventional lithium battery pack is wrapped by plastic or metal shell to protect the cell from external impact deformation leading to thermal runaway, but the thermal runaway caused by battery loop short circuit or cell internal short circuit cannot be predicted and avoided, and the necessity of setting explosion -proof valve on the battery pack is more prominent. The existing upper cover integral type explosion -proof valve adopts ultrasonic welding process of air permeable film, needs to cut air permeable film separately after upper cover injection molding, then air permeable film is welded on the upper cover, the welding process requirement is relatively high, the yield of good welding is low, there is the risk of explosion -proof valve failure, and the safety performance is poor.

[0003] Therefore, it is necessary to provide a novel battery pack integral type explosion -proof subassembly and battery pack to overcome the above defects. CONTENT OF UTILITY MODEL

[0004] The utility model aims at providing a battery pack integral type explosion -proof subassembly and battery pack to solve the above technical problems.

[0005] In order to realize the above purpose, first, the utility model provides a battery pack integral type explosion -proof subassembly, including box and explosion -proof valve spring, the box is plastic box, the box includes a plurality of board bodies, a plurality of board bodies enclose the accommodation space, the accommodation space is used to accommodate a plurality of batteries of battery pack, the explosion -proof valve spring is metal spring, the explosion -proof valve spring is embedded in one of the board bodies, and the explosion -proof valve spring is integrally injection molded with the board body, the surface of the explosion -proof valve spring close to the accommodation space is provided with a connecting part, and the surface of the explosion -proof valve spring away from the accommodation space is provided with explosion -proof indentation.

[0006] In a preferred embodiment, the explosion -proof valve spring is circular or oval, and the explosion -proof indentation is a straight line indentation or a circular arc indentation.

[0007] In a preferred embodiment, the connecting part is sawtoothed, and the connecting part is arranged at the edge position of the explosion -proof valve spring.

[0008] In a preferred embodiment, the end point of the explosion -proof indentation and the edge of the explosion -proof valve spring are reserved with a preset distance, and the width of the connecting part in the radial direction of the explosion -proof valve spring is less than or equal to the preset distance.

[0009] In one preferred embodiment, the explosion-proof indentation comprises two straight line indentations perpendicular to each other, and the intersection of the two straight line indentations is the center of the explosion valve spring.

[0010] In one preferred embodiment, the explosion-proof indentation comprises three straight line indentations parallel to each other, and the three straight line indentations are symmetrically arranged.

[0011] In one preferred embodiment, the explosion-proof indentation comprises two circular arc indentations, the two circular arc indentations are semicircular, and the two circular arc indentations are tangent to each other, and the tangent point is the center of the explosion valve spring.

[0012] In one preferred embodiment, the plate body comprises a bottom plate, a plurality of side plates arranged on the bottom plate, and an upper cover plate opposite to the bottom plate and connected to the side plates, and the explosion valve spring is arranged on the upper cover plate.

[0013] In one preferred embodiment, the explosion valve spring is a nickel-plated steel sheet.

[0014] In a second aspect, the utility model provides a kind of battery pack, including the integrated explosion-proof assembly of battery pack of any one of the above first aspect.

[0015] Compared with the prior art, the integrated explosion-proof assembly of battery pack and the battery pack provided by the utility model, the box body is a plastic box body, the box body includes a plurality of plate bodies, the plurality of plate bodies enclose a receiving space, the explosion valve spring is a metal spring, the explosion valve spring is embedded on one of the plate bodies, and the explosion valve spring is integrally injection molded with the plate body, the surface of the explosion valve spring close to the receiving space is provided with a connecting portion, and the surface of the explosion valve spring away from the receiving space is provided with an explosion-proof indentation, when thermal runaway occurs in the battery cell inside the battery pack, the gas generated by the battery cell can instantaneously increase the internal pressure of the battery pack box body, the explosion-proof indentation of the explosion valve spring is broken, and the explosion valve is opened to discharge gas. The explosion valve spring is pre-injection molded on the plastic box body, the structure is simple, easy to implement, does not require welding process, can reduce product production failure rate, reduce the risk of explosion valve failure, has excellent explosion-proof performance, and has good safety performance. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiments, and it should be understood that the following drawings only show some embodiments of the utility model, and should not be regarded as limiting the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0017] Figure 1 The structure diagram of the integrated explosion-proof assembly of the battery pack provided by the utility model is shown in the figure.

[0018] Figure 2 A structural diagram of the explosion-proof valve spring of the integrated explosion-proof assembly of the battery pack is provided in the utility model;

[0019] Figure 3 A schematic diagram of the explosion-proof valve spring is provided in the utility model;

[0020] Figure 4 And Figure 5 A schematic diagram of the explosion-proof valve spring is provided in the utility model;

[0021] Figure 6 And Figure 7 A schematic diagram of the explosion-proof valve spring is provided in the utility model.

CONCRETE EMBODIMENT

[0022] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. The components of the embodiments of the utility model described and shown in the drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but only represents selected embodiments of the utility model. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0023] Please refer to Figure 1 , which is a structural diagram of the integrated explosion-proof assembly 100 of the battery pack provided by the utility model. The integrated explosion-proof assembly 100 of the battery pack provided by the utility model pre-injection molds the explosion-proof valve spring into the plastic box body, which is simple in structure, easy to implement, can reduce product production failure rate, reduce the risk of explosion-proof valve failure, has excellent explosion-proof performance, and has good safety performance. Specifically, the integrated explosion-proof assembly 100 of the battery pack box body 10 and the explosion-proof valve spring 20.

[0024] The box body 10 is a plastic box body, and the box body 10 includes a plurality of plate bodies 11, the plurality of plate bodies 11 enclose a receiving space, and the receiving space is used for receiving a plurality of batteries of the battery pack. The box body 10 can specifically be a cuboid, the plate body 11 includes a bottom plate 111, a plurality of side plates 112 arranged on the bottom plate 111, and an upper cover plate 113 opposite to the bottom plate 111 and connected to the side plates 112, the side plates 112 are perpendicular to the bottom plate 11 and the upper cover plate 113, and the bottom plate 111, the side plates 112 and the upper cover plate 113 jointly enclose a receiving space for receiving the batteries.

[0025] Please refer to Figure 2The explosion-proof valve spring 20 is a metal spring, the explosion-proof valve spring 20 is embedded on one of the plate bodies 11, and the explosion-proof valve spring 20 is integrally injection molded with the plate body 11, a connecting portion 21 is protruded on the surface of the explosion-proof valve spring 20 close to the accommodation space, and an explosion-proof indentation 22 is arranged on the surface of the explosion-proof valve spring 20 away from the accommodation space.

[0026] Specifically, the explosion-proof valve spring 20 is embedded in the plate body 11, that is, the explosion-proof valve spring 20 is embedded in a box mold and injection molded to form an integrated box body with the embedded explosion-proof valve spring. When the battery pack is in thermal runaway, the gas generated by the battery cell can instantaneously increase the internal pressure of the battery pack box body, break the explosion-proof indentation 22 of the explosion-proof valve spring, and play a role of opening the explosion-proof valve and discharging gas. In the embodiment, the explosion-proof valve spring 20 is a nickel-plated steel sheet, which can play a waterproof role. The explosion-proof valve spring uses a hardware stamping structure, the explosion-proof valve spring 20 is arranged on the upper cover plate 113, and the connecting portion 21 protruded on the surface of the explosion-proof valve spring 20 can increase the contact area with the plate body during injection molding, so that the explosion-proof valve spring is more closely connected with the plate body.

[0027] Therefore, the integrated explosion-proof assembly 100 of the battery pack provided by the utility model has the advantages that the box body 10 is a plastic box body, the box body 10 comprises a plurality of plate bodies 11, the plurality of plate bodies 11 enclose an accommodation space, the explosion-proof valve spring 20 is a metal spring, the explosion-proof valve spring 20 is embedded on one of the plate bodies 11, and the explosion-proof valve spring 20 is integrally injection molded with the plate body 11, the surface of the explosion-proof valve spring 20 close to the accommodation space is provided with a connecting portion 21, and the surface of the explosion-proof valve spring 20 away from the accommodation space is provided with an explosion-proof indentation 22, when the battery pack is in thermal runaway, the gas generated by the battery cell can instantaneously increase the internal pressure of the battery pack box body, break the explosion-proof indentation 22 of the explosion-proof valve spring, and play a role of opening the explosion-proof valve and discharging gas. The explosion-proof valve spring is pre-injection molded on the plastic box body, the structure is simple, easy to realize, and welding process is not needed, so that the product production failure rate and the explosion-proof valve failure risk can be reduced, the explosion-proof performance is excellent, and the safety performance is good.

[0028] In some embodiments, the explosion-proof valve spring 20 is circular or elliptical, the explosion-proof indentation 22 is a straight line indentation or a circular arc indentation, the connecting portion 21 is sawtooth-shaped, and the connecting portion 21 is arranged at the edge position of the explosion-proof valve spring 22. The end point of the explosion-proof indentation 22 and the edge of the explosion-proof valve spring 20 are reserved with a preset distance, the width of the connecting portion 21 in the radial direction of the explosion-proof valve spring 20 is less than or equal to the preset distance, that is, as shown in the figure, the width of the connecting portion 21 is less than or equal to the distance between the end point of the explosion-proof indentation 22 and the edge of the explosion-proof valve spring 20. Figure 2As shown, the preset distance of the end point of the explosion-proof indentation 22 to the edge of the explosion-proof valve spring 20 is d1, the preset distance d1 is the distance in the radial direction of the explosion-proof valve spring, the width d2 of the connecting portion 22 in the radial direction of the explosion-proof valve spring, then d2<=d1, that is, the connecting portion 22 and the indentation 21 are not overlapped in the position of the two surfaces of the explosion-proof valve spring 20, which avoids affecting the explosion-proof effect or the connection stability. Figure 2 In the embodiment, d2=d1.

[0029] Please refer to Figure 3 , Figure 3 The embodiment provides a schematic diagram of the explosion-proof valve spring, and specifically, Figure 3 In the embodiment, the explosion-proof valve spring is an oval shape, the explosion-proof indentation 22 comprises two straight line indentations which are perpendicular to each other, and the intersection of the two straight line indentations is the center of the explosion-proof valve spring 20.

[0030] Please refer to Figure 4 and Figure 5 , Figure 4 and Figure 5 The embodiment provides a schematic diagram of the explosion-proof valve spring, and specifically, Figure 4 In the embodiment, the explosion-proof valve spring is a circular shape, Figure 5 In the embodiment, the explosion-proof valve spring is an oval shape, the explosion-proof indentation comprises three straight line indentations which are parallel to each other, and the three straight line indentations are symmetrically arranged.

[0031] Please refer to Figure 6 and Figure 7 , Figure 6 and Figure 7 The embodiment provides a schematic diagram of the explosion-proof valve spring, and specifically, Figure 6 In the embodiment, the explosion-proof valve spring is a circular shape, Figure 7 In the embodiment, the explosion-proof valve spring is an oval shape, the explosion-proof indentation 22 comprises two circular arc indentations, the two circular arc indentations are semicircular shapes, and the two circular arc indentations are tangent to each other, and the tangent point is the center of the explosion-proof valve spring 20.

[0032] The shape of the explosion-proof indentation provided by different embodiments of the utility model is beneficial to the explosion-proof valve spring to tear along the indentation direction, the spring to instantaneously burst, the gas to be quickly discharged, the pressure intensity borne by the battery pack box to be ensured within a controllable safe range, and the safety to be improved.

[0033] The utility model discloses a novel design mode of explosion-proof valve and battery pack shell, aims at solving the problem of the current explosion-proof valve occupying large size space, low yield of welding of air permeable membrane, and certain failure of the explosion-proof valve under specific working conditions.

[0034] The battery pack box body and the explosion-proof valve are integrally injection molded, the product production failure rate is reduced, and the failure risk is reduced.

[0035] The utility model further provides a battery pack, including the battery pack's integral type explosion -proof subassembly 100 of any one of the above, and the battery pack can include a plurality of batteries, and the battery pack can provide electric energy for various electric equipment such as electric vehicle etc.

[0036] In conclusion, the battery pack's integral type explosion -proof subassembly 100 and the battery pack, the box body 10 is plastic box body, and the box body 10 includes a plurality of plate bodies 11, and the plurality of plate bodies 11 enclose the accommodation space, the explosion -proof valve sheet metal 20 is metal sheet metal, and the explosion -proof valve sheet metal 20 is embedded in one of plate body 11, and the explosion -proof valve sheet metal 20 and plate body 11 integrally injection molded, and the surface of explosion -proof valve sheet metal 20 close to the accommodation space is provided with the connecting portion 21, and the surface of explosion -proof valve sheet metal 20 away from the accommodation space is provided with the explosion -proof indentation 22, when the thermal runaway of the battery pack internal electric core occurs, the gas of electric core can increase the internal air pressure of battery pack box body instantaneously, and the explosion -proof indentation 22 of explosion -proof valve sheet metal is broken, and the explosion -proof valve opens the valve exhaust function.

[0037] The above merely describes the implementation manners of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, which is made by using the content of the present application specification and drawings, is also included in the patent protection scope of the present application.

Claims

1. An integrated explosion-proof assembly for a battery pack, comprising: The battery pack integrated explosion-proof assembly comprises a box body and an explosion-proof valve spring, the box body is a plastic box body, the box body comprises a plurality of plate bodies, the plurality of plate bodies enclose a receiving space, the receiving space is used for accommodating a plurality of batteries of a battery pack, the explosion-proof valve spring is a metal spring, the explosion-proof valve spring is embedded on one of the plate bodies, and the explosion-proof valve spring is integrally injection molded with the plate body, a connecting portion is protruded on a surface of the explosion-proof valve spring close to the receiving space, and an explosion-proof indentation is formed on a surface of the explosion-proof valve spring away from the receiving space.

2. The integrated explosion-proof assembly of the battery pack of claim 1, wherein, The explosion-proof valve spring is circular or elliptical, and the explosion-proof indentation is a straight line indentation or a circular arc indentation.

3. The integrated explosion-proof assembly of the battery pack of claim 2, wherein, The connecting portion is sawtooth-shaped, and the connecting portion is arranged at an edge position of the explosion-proof valve spring.

4. The integrated explosion-proof assembly of the battery pack of claim 3, wherein, Endpoints of the explosion-proof indentation and an edge of the explosion-proof valve spring are reserved with a preset distance, and a width of the connecting portion in a radial direction of the explosion-proof valve spring is less than or equal to the preset distance.

5. The integrated explosion-proof assembly of the battery pack of claim 2, wherein, The explosion-proof indentation comprises two straight line indentations perpendicular to each other, and an intersection of the two straight line indentations is a center of the explosion-proof valve spring.

6. The integrated explosion-proof assembly of the battery pack of claim 2, wherein, The explosion-proof indentation comprises three straight line indentations parallel to each other, and the three straight line indentations are symmetrically arranged.

7. The integrated explosion-proof assembly of the battery pack of claim 2, wherein, The explosion-proof indentation comprises two circular arc indentations, the two circular arc indentations are semicircular, and the two circular arc indentations are tangent to each other, and a tangent point is a center of the explosion-proof valve spring.

8. The integrated explosion-proof assembly of the battery pack of claim 1, wherein, The plate body comprises a bottom plate, a plurality of side plates arranged on the bottom plate, and an upper cover plate opposite to the bottom plate and connected to the side plates, and the explosion-proof valve spring is arranged on the upper cover plate.

9. The integral explosion-proof assembly of a battery pack according to any one of claims 1-8, wherein, The explosion-proof valve spring is a nickel-plated steel sheet.

10. A battery pack, characterized by, The battery pack integrated explosion-proof assembly comprises a battery pack and an explosion-proof valve spring, the explosion-proof valve spring is a metal spring, the explosion-proof valve spring is embedded on one of the plate bodies, and the explosion-proof valve spring is integrally injection molded with the plate body.

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