CN217606978U - Battery package and power vehicle - Google Patents

Abstract

The utility model discloses a battery pack and a power vehicle, wherein, the battery pack comprises a box body, a sealing cover covering the box body and a film cavity arranged between the box body and the sealing cover, the film cavity, the box body and the sealing cover surround to form an inner closed space, and the box body is provided with an installation area for accommodating the film cavity; the film cavity is connected with a ventilation valve arranged outside the sealing cover. The battery pack provided by the utility model can realize the adjustment of the internal pressure of the battery pack by arranging the film cavity in the battery pack; the air pressure inside and outside the battery pack can be kept balanced through the vent valve on the film cavity, so that the sealing performance and the explosion-proof performance of the battery pack are greatly improved; through the seal structure of film chamber, can also improve waterproof performance, avoid moist air directly to enter into the battery package inside, lead to the inside condensation that produces of battery package and then influence the insulating properties of whole package, prevent phenomenons such as electric leakage.

Description

Battery package and power vehicle

Technical Field

The utility model relates to a battery technology field, concretely relates to battery package and contain vehicle of this battery package.

Background

Because the battery package is high voltage components and parts, its requirement for insulating is very high. When the single batteries in the battery pack are charged and discharged or the external temperature, the pressure and the like are changed, the internal pressure and the external pressure of the battery pack are inconsistent. If the battery pack is completely sealed, the sealing cover may be broken due to excessive internal pressure, which may affect the sealing performance of the entire battery pack. Although some battery packs are also completely sealed, the strength of the entire case is strong, and the strength of the case is dependent on the internal and external pressure changes.

Many existing battery packs have one or more waterproof vent valves for balancing the internal and external pressure of the battery pack. However, the existing waterproof vent valve can only prevent liquid water from entering the battery pack and cannot isolate water vapor mixed in air. Therefore, condensed liquid water may appear inside the battery pack over time.

In other techniques, a desiccant or the like is added to the interior of the dehumidification product through relevant components, but the desiccant or the like can absorb a certain amount of water, so that the dehumidification product is frequently replaced in some cases.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned drawbacks or shortcomings in the prior art, it is desirable to provide a battery pack and a vehicle, which can achieve sealing performance of the battery pack, and also can improve reliability and reduce maintenance times.

The utility model provides a battery pack, which comprises a box body, a sealing cover covering the box body and a film cavity arranged between the box body and the sealing cover, wherein the film cavity, the box body and the sealing cover surround to form an inner closed space, and the box body is provided with an installation area for accommodating the film cavity; the film cavity is connected with a ventilation valve which is arranged outside the sealing cover.

Optionally, the film chamber is used for balancing pressure change inside the battery pack, the volume of the film chamber is reduced when the pressure inside the battery pack is increased, and the volume of the film chamber is increased when the pressure inside the battery pack is reduced.

Optionally, the breather valve is a two-way breather valve comprising a first breather passage and a second breather passage, wherein,

when the pressure in the film cavity is increased, the first ventilation channel is opened, so that the gas in the film cavity is exhausted outwards;

when the pressure in the film cavity is reduced, the second air-permeable channel is opened, so that external air enters the film cavity.

Optionally, the number of membrane lumens is at least one.

Optionally, the film cavity is made of an organic polymer material, and the film cavity and the vent valve are fixedly connected through a hot pressing mode.

Optionally, an opening matched with the ventilation valve is arranged on the sealing cover.

Optionally, the ventilation valve includes a valve body and an end cover, the valve body extends out of the sealing cover from the opening position, and the end cover is disposed outside the sealing cover and fixedly connected to the valve body.

Optionally, the vent valve is a waterproof vent valve.

Optionally, a battery module or a single battery is arranged in the box body.

In a second aspect, the present invention provides a powered vehicle comprising a battery pack as described in any of the above.

The utility model provides a technical scheme can include following beneficial effect:

the utility model provides a battery pack, through setting up the film chamber in the inside, through the flexible variability structure, can realize the adjustment of the internal pressure of battery pack; the internal and external air pressure balance of the battery pack can be kept through the vent valve on the film cavity, so that the sealing performance and the explosion-proof performance of the battery pack are greatly improved; through the seal structure of film chamber, can also improve waterproof performance, avoid moist air directly to enter into inside the battery package, lead to the inside insulating properties who produces the condensation and then influence whole package of battery package, prevent phenomenons such as electric leakage.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:

fig. 1 is a schematic structural view of a battery pack provided by the present invention;

fig. 2 is a schematic structural view of a battery pack provided by the present invention with a sealing cover removed;

fig. 3 is a schematic structural view of a film chamber provided by the present invention;

fig. 4 is a schematic structural diagram of a box body provided by the present invention;

fig. 5 is a schematic cross-sectional view of a vent valve according to the present invention.

In the figure:

1. a box body; 2. a sealing cover; 3. a thin film chamber; 4. a vent valve; 5. an installation area; 6. an opening; 7. air holes are formed; 41. a first air-permeable passage; 42. a second air-permeable passage; 43. a first valve spool; 44. a second valve core; 45. a valve body; 46. an end cap; 47. waterproof ventilated membrane.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.

It should be noted that, in the case of no conflict, the embodiments and features of the embodiments of the present invention may be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Please refer to fig. 1-2 in detail, the present application provides a battery pack, which includes a case 1, a sealing cover 2 covering the case 1, and a film chamber 3 disposed between the case 1 and the sealing cover 2, wherein the film chamber 3, the case 1, and the sealing cover 2 surround to form an inner sealed space. The box body 1 is provided with an installation area for accommodating the film chamber 3.

The film cavity 3 is of an elastic closed structure, and the film cavity 3 is connected with a vent valve 4 which is arranged outside the sealing cover 2.

Wherein, be provided with battery module or battery cell in the box 1. The box body 1 and the sealing cover 2 are connected in a sealing mode, and the box body 1 and the sealing cover 2 jointly limit an installation space for accommodating a battery module or a single battery. It should be noted that the battery module generally includes a plurality of single batteries, the number of the single batteries is designed according to actual needs, and the power battery may also include a plurality of battery packs and a plurality of battery packs located inside the battery packs according to actual needs. Other structures in the power battery, such as structures between battery packs and structures inside the battery pack, and other structures in the battery pack can adopt the prior art, and are not described herein again.

The battery inside the battery pack can generate gas in the process of storage and use, and the battery pack is sealed for preventing external dust and liquid from entering, so that the gas pressure inside the battery pack can be increased, and the battery pack is deformed and cracked. When the battery pack is out of control due to heat, gas in the battery pack cannot be discharged in time, and the battery pack explodes. In the embodiment of the present application, the film chamber 3 is used for balancing the pressure change inside the battery pack, when the pressure inside the battery pack increases, the volume of the film chamber 3 decreases, and when the pressure inside the battery pack decreases, the volume of the film chamber 3 increases.

The volume in the battery package is adjusted through this structure, and then adjusts the inside atmospheric pressure of battery package, makes the battery package inside and outside atmospheric pressure tend to unanimity, and the inside and outside atmospheric pressure of balance avoids the shell to bear great pressure and leads to the shell to break, and then influences the leakproofness of whole package. Therefore, the phenomenon that moist air directly enters the battery pack to cause condensation inside the battery pack and further influence the insulating property of the whole pack to cause electric leakage and the like is avoided.

In one implementation, the membrane chamber 3 is a membrane structure of an organic polymer material. The film cavity 3 and the vent valve 4 are fixedly connected in a hot pressing mode. As shown in fig. 3, the membrane structure of the membrane housing 3 is made of latex material (latex material is made of natural rubber) for example, and other organic materials can be used. Specifically, for example, polyethylene, polypropylene, polyvinyl chloride, polystyrene, or the like, and other resins are used. Alternatively, in other implementations, the film may be formed by combining multiple materials, such as a composite material including a plastic film, a glue layer, an aluminum foil, a glue layer, and a plastic insulating layer. When the gas expansion or shrink in the sealed chamber, carry out deformation through 3 self toughness of film chamber and absorb, guarantee that battery package inside gas and external environment gas keep apart completely, prevent the problem of sealed inefficacy.

Optionally, the number of the film chambers 3 is at least one, and at least one mounting area 5 for accommodating the film chambers 3 is arranged on the box body 1.

In the embodiment of the application, the number and the position of the film cavities 3 are not limited, the film cavities 3 can be arranged on any side of the positions around the box body 1, the suitable volume film cavities 3 are selected according to actual conditions, and the inlets of the cavities are connected with the inlets of the ventilation valves 4. In addition, the film chamber 3 in the present application may have a structure with a fixed shape, and the material of the film chamber 3 itself has a certain rigidity, so that the shape of the film chamber itself can be maintained. In other embodiments, the membrane lumens 3 may be made of a material having high flexibility, and a rigid support structure may be provided inside the membrane lumens 3 to maintain a specific shape of the membrane lumens. The film cavity 3 with a specific shape can ensure that the transformation is uniform when the volume of the film cavity 3 is transformed, and the effect of pressure dispersion is realized.

In the embodiment of the application, as shown in fig. 4, a plurality of air holes 7 may be further formed in the wall surface of the box body 1 contacting the film cavity 3, and when the pressure inside the box body 1 changes, the pressure inside the box body 1 may be adjusted from the positions of the air holes 7 through the air holes 7. Of course, the position of the air holes 7 in the box body 1 is not limited in the embodiment of the present application, and different setting modes can be performed according to the structure, the volume and the like of the box body 1. In the embodiment of the present application, even though the ventilation hole 7 is provided in the case 1, the sealing performance of the entire battery pack is not affected. In the embodiment of the present application, the sealing performance of the battery pack as a whole is achieved by the sealing between the case 1 and the sealing cover 2.

In order to further improve the sealing and explosion-proof performance of the battery pack, in the embodiment of the application, the ventilation valve 4 is arranged on the film cavity 3, so that the volume of the film cavity 3 can change along with the pressure, the pressure inside the battery pack is maintained, and the sealing and explosion-proof performance is improved.

In the embodiment of the present application, the vent valve 4 is a two-way vent valve 4, and the vent valve 4 includes a first vent channel 41 and a second vent channel 42, wherein when the pressure inside the membrane chamber 3 increases, the first vent channel 41 opens to allow the gas inside the membrane chamber 3 to be discharged outwards; when the pressure inside the membrane chamber 3 decreases, the second gas-permeable passage 42 opens, allowing external gas to enter the inside of the membrane chamber 3.

It should be noted that, in the embodiment of the present application, the vent valve 4 may be a combination of two one-way vent valves 4, and of course, various structures of two-way vent valves 4 in the prior art may also be adopted, which is not limited in the present application. In addition, water vapor in the air can enter the battery pack through the vent valve 4 along with the air, if the battery pack works in an environment with large temperature and humidity change for a long time, the water vapor can be continuously input into the battery pack, and condensed water is formed in the battery pack when the temperature changes.

Optionally, the breather valve 4 is a waterproof breather valve. When specifically setting up, can adopt the special construction of waterproof breather valve among the prior art, realize water-proof effects, of course, can also adopt to add waterproof ventilated membrane 47 in one-way breather valve, two-way breather valve, realize water-proof effects. Of course, the waterproof breathable film 47 can be made of various films in the prior art, such as a film made of polytetrafluoroethylene. In the embodiment of the present application, the structure of the waterproof air-permeable valve 4 is not limited. The waterproof ventilation valve in any mode belongs to the protection scope of the application.

Fig. 5 shows a structure of the waterproof vent valve, wherein the waterproof vent membrane 47 is a film made of polytetrafluoroethylene, and the waterproof vent membrane 47 is fixed on the end face of the valve body 45 through an adhesive layer.

Wherein, the vent valve 4 comprises a first vent channel 41 and a second vent channel 42, when the internal pressure in the membrane chamber 3 increases, the internal pressure pushes the first valve core 43 to move upwards, the first vent channel 41 is opened, the gas in the membrane chamber 3 is discharged to the external environment through the first vent channel 41, and when the pressures of the two reach equilibrium, the first vent channel 41 is closed; when the internal pressure in the membrane chamber 3 decreases, the external pressure pushes the second valve spool 44 downward, the second air-permeable passage 42 opens, external air enters the membrane chamber 3, and when the pressures of the two reach equilibrium, the second air-permeable passage 42 closes.

In the embodiment of the present application, the sealing cover 2 is provided with an opening 6 which is matched with the ventilation valve 4. The ventilation valve 4 comprises a valve body 45 and an end cover 46, wherein the valve body 45 extends out of the sealing cover 2 from the opening 6, and the end cover 46 is arranged outside the sealing cover 2 and fixedly connected with the valve body 45.

The film chamber 3 can be secured on the one hand and the sealing properties can be improved on the other hand by means of the opening 6 of the sealing cover 2. Of course, in order to further improve the sealing effect between the sealing cover 2 and the case 1, a gasket or the like may be provided at the mounting position of the breather valve 4.

In this application embodiment, can prevent through waterproof ventilation valve 4 that vapor in the air from entering into film chamber 3 in, in addition, in this application embodiment, the film of film chamber 3 adopts complete inclosed structure, and under the great condition of inside and outside difference in temperature, even the cold air enters into film chamber 3 and condenses the water droplet, through the structure of film chamber 3, air and water can't enter into the inside of battery package. The interior of the battery pack can be further isolated by the film chamber 3.

The application also provides a power vehicle, which comprises the battery pack.

The embodiment of the utility model provides a battery pack, through setting up the film chamber 3 in inside, through the flexible structure of changeability, can realize the adjustment of the internal pressure of battery pack; the internal and external air pressure balance of the battery pack can be kept through the vent valve 4 on the film cavity 3, so that the sealing performance and the explosion-proof performance of the battery pack are greatly improved; through the seal structure of the film cavity 3, the waterproof performance can be further improved, the moist air is prevented from directly entering the battery pack, the condensation is generated inside the battery pack, the insulating performance of the whole pack is further influenced, and the phenomena of electric leakage and the like are prevented.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Terms such as "disposed" and the like, as used herein, may refer to one element being directly attached to another element or one element being attached to another element through intervening elements. Features described herein in one embodiment may be applied to another embodiment, either alone or in combination with other features, unless the feature is otherwise inapplicable or otherwise stated in the other embodiment.

The present invention has been described in terms of the above embodiments, but it is to be understood that the above embodiments are for purposes of illustration and description only and are not intended to limit the invention to the described embodiments. It will be appreciated by those skilled in the art that many more modifications and variations are possible in light of the above teaching and are intended to be included within the scope of the invention.

Claims (10)

1. A battery pack is characterized by comprising a box body, a sealing cover covering the box body and a film cavity arranged between the box body and the sealing cover, wherein the film cavity, the box body and the sealing cover surround to form an internal closed space, and the box body is provided with an installation area for accommodating the film cavity; the film cavity is connected with a ventilation valve which is arranged outside the sealing cover.

2. The battery pack of claim 1, wherein the membrane chamber is configured to balance pressure changes inside the battery pack, wherein the membrane chamber decreases in volume when pressure inside the battery pack increases, and wherein the membrane chamber increases in volume when pressure inside the battery pack decreases.

3. The battery pack of claim 1, wherein the vent valve is a two-way vent valve comprising a first vent channel and a second vent channel, wherein,

when the pressure in the film cavity is increased, the first ventilation channel is opened, so that the gas in the film cavity is exhausted outwards;

when the pressure in the film cavity is reduced, the second air-permeable channel is opened, so that external air enters the film cavity.

4. The battery pack of claim 1, wherein the number of membrane lumens is at least one.

5. The battery pack according to claim 1, wherein the film chamber is made of an organic polymer material, and the film chamber and the vent valve are fixedly connected by a hot-pressing method.

6. The battery pack of claim 1, wherein the sealing cap is provided with an opening that mates with the vent valve.

7. The battery pack of claim 6, wherein the vent valve comprises a valve body and an end cap, the valve body extends out of the sealing cover from the opening position, and the end cap is arranged outside the sealing cover and fixedly connected with the valve body.

8. The battery pack of claim 1, wherein the vent valve is a waterproof vent valve.

9. The battery pack according to claim 1, wherein a battery module or a single battery is provided in the case.

10. A powered vehicle comprising a battery pack as claimed in any one of claims 1 to 9.

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