CN220796942U

CN220796942U - Battery pack

Info

Publication number: CN220796942U
Application number: CN202322035879.0U
Authority: CN
Inventors: 郑剑武; 王志杰; 吴先钢; 赖庆; 王亚磊
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2023-07-31
Filing date: 2023-07-31
Publication date: 2024-04-16
Anticipated expiration: 2033-07-31

Abstract

The utility model discloses a battery pack, which comprises: the battery module, distributor, box, cooling piece and heat preservation piece, the box has independent and airtight battery cavity and distribution cavity, the distributor is installed in the distribution cavity, the battery module is installed in the battery cavity; the cooling piece is arranged in the battery cavity or the cavity wall of the battery cavity, and the cooling piece is in heat transfer connection with the battery module; the heat preservation piece sets up in the distribution chamber, and the heat preservation piece contacts with the distributor. According to the embodiment, the battery cavity and the power distribution cavity are respectively and independently arranged, and the battery cavity and the power distribution cavity are closed spaces, so that fluid interaction between the battery cavity and the power distribution cavity is prevented, and the mutual influence between the battery cavity and the power distribution cavity is avoided; meanwhile, the heat preservation piece is arranged in the power distribution cavity, so that the probability of high-voltage arc discharge risk of the power distributor is reduced, and the safety of the battery pack is improved.

Description

Battery pack

Technical Field

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

Background

The power source of the electric automobile comprises a battery pack, and the battery pack is formed by connecting a plurality of batteries in series and parallel, so that the requirements of the electric automobile on high-capacity and high-voltage batteries are met.

In the related art, a battery pack includes an upper cover, a battery pack, a distributor, and a tray having a cavity in which the battery pack and the distributor are placed, the upper cover being provided at an opening of the cavity.

However, the structure makes the distributor easily have high-voltage arc discharge risks, and influences the safety performance of the battery pack.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, an object of the present utility model is to provide a battery pack, which reduces the probability of high-voltage arcing risk of a distributor and improves the safety of the battery pack.

According to an embodiment of the present utility model, a battery pack includes: a battery module, a distributor, a box body, a cooling piece and a heat preservation piece,

the box body is provided with a battery cavity and a power distribution cavity which are independent and airtight, the power distributor is arranged in the power distribution cavity, and the battery module is arranged in the battery cavity; the cooling piece is arranged in the battery cavity or the cavity wall of the battery cavity, and the cooling piece is in heat transfer connection with the battery module; the heat preservation piece set up in the distribution chamber, the heat preservation piece with the distributor contacts.

According to the embodiment, the battery cavity and the power distribution cavity are respectively and independently arranged, and the battery cavity and the power distribution cavity are closed spaces, so that fluid interaction between the battery cavity and the power distribution cavity is prevented, and the mutual influence between the battery cavity and the power distribution cavity is avoided; meanwhile, the heat preservation piece is arranged in the power distribution cavity, so that the probability of high-voltage arc discharge risk of the power distributor is reduced, and the safety of the battery pack is improved.

According to some embodiments of the utility model, the case comprises a body and a cover, the body is provided with a battery slot and a distribution slot,

the cover body comprises a first part and a second part, the first part covers the battery groove opening to form the battery cavity, the second part covers the distribution groove opening to form the distribution cavity, the first part is fixedly installed in the battery groove opening, and the second part is detachably installed in the distribution groove opening. The second part is detachably arranged at the opening of the distribution groove, so that the distributor and related parts can be maintained in the later stage.

According to some embodiments of the utility model, the second portion is threadably coupled to the distribution slot opening.

According to some embodiments of the utility model, a first seal is provided between the second portion and the distribution box opening, the first seal being connected to the surface of the second portion facing the distribution box or the distribution box opening. The arrangement ensures that the distribution cavity has good sealing performance on one hand; on the other hand, the fixed first seal can avoid affecting the assembly of the first plate body.

According to some embodiments of the utility model, the first portion is adhesively attached to the battery well opening and the first portion is threadably attached to the battery well opening. By the arrangement, the battery cavity can be guaranteed to have good sealing performance, and electrolyte steam generated by the battery module is prevented from overflowing the battery cavity.

According to some embodiments of the utility model, the body has a receiving groove, the battery pack further includes a first partition plate and a second partition plate disposed in the receiving groove, the first partition plate divides the receiving groove to form the battery groove and the distribution groove, the second partition plate divides the battery groove to form a battery module area, and the first partition plate and the receiving groove are integrally formed or the first partition plate and the second partition plate are adhered to the receiving groove. By the arrangement, no channel for circulation exists between the distribution groove and the battery groove, and fluid interaction between the battery cavity and the distribution cavity is avoided. The heat transfer between two adjacent battery modules can be restrained, so that the temperatures of the battery modules are equivalent, and the battery pack temperature equalizing effect can be realized.

According to some embodiments of the utility model, the cover comprises a first plate and a second plate, the first plate is provided with a hollowed-out part, the orthographic projection of the distribution groove on the first plate coincides with the hollowed-out part, the second plate is detachably covered on the hollowed-out part of the first plate,

the first portion is configured such that the first plate body removes the remaining portion of the hollowed-out portion, and the second portion is configured such that the second plate body. The cover body is simple in structure and low in manufacturing cost.

According to some embodiments of the utility model, a second sealing member is sandwiched between the second plate and the hollowed-out portion of the first plate. Thus, the good sealing performance of the distribution groove can be kept all the time.

According to some embodiments of the utility model, the thermal insulation member is thermal insulation cotton, and the thermal insulation cotton is arranged at the bottom of the power distribution cavity. Thus, buffering can be increased, and collision between the distributor and the distribution cavity is avoided.

According to some embodiments of the utility model, the cavity wall of the battery cavity comprises a bottom wall, the bottom wall is provided with a cavity structure, the cooling piece is arranged in the cavity structure, and the battery module is attached to the bottom wall. According to the arrangement mode, the cooling piece is prevented from occupying the space of the battery cavity, more battery modules can be arranged in the battery cavity, and the capacity of the battery pack is improved.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

fig. 1 is an exploded view of a battery pack according to an embodiment of the present utility model;

FIG. 2 is a partial enlarged view A of FIG. 1;

FIG. 3 is a schematic diagram of a box structure according to an embodiment of the present utility model;

FIG. 4 is a second schematic diagram of a case structure according to an embodiment of the present utility model;

fig. 5 is a partial enlarged view B of fig. 4;

FIG. 6 is a schematic view of a cover structure according to an embodiment of the present utility model;

reference numerals:

the battery box comprises a box body 10, a body 11, a battery groove 101, a battery module area 1011, a distribution groove 102, a first threaded hole 111, a cover body 12, a first plate body 121, a first through hole 1211, a second threaded hole 1212, a hollowed-out part 1213, a second plate body 122 and a second through hole 1221;

a battery module 20, a power distributor 30, and a heat insulating member 40;

the first seal 51, the second seal 52, the first partition plate 61, the second partition plate 62, the glue groove 621, and the third screw hole 622.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

The following disclosure provides many different embodiments, or examples, for implementing different structures of the utility model. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the utility model. Furthermore, the present utility model may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present utility model provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the applicability of other processes and/or the use of other materials.

A battery pack according to an embodiment of the present utility model is described below with reference to the accompanying drawings.

As shown in fig. 1 to 6, the battery pack according to the embodiment of the present utility model includes a battery module 20, a power distributor 30, a case 10, a heat insulating member 40, and a cooling member.

The case 10 is provided with a battery chamber and a power distribution chamber which are independent of each other. The battery cavity and the power distribution cavity are both closed spaces. The distributor 30 is mounted to the distribution chamber. The battery module 20 is mounted in the battery chamber.

The heat preservation piece 40 is arranged in the power distribution cavity, and the heat preservation piece 40 is contacted with the power distributor; a cooling member (not shown) is provided in the battery chamber or the chamber wall of the battery chamber, and the cooling member is in heat transfer connection with the battery module 20.

The battery chamber and the distribution chamber are independent of each other, that is, the battery module 20 is located in an independent space, and the distributor 30 is located in an independent space. The battery cavity and the power distribution cavity are both closed spaces. By the arrangement, fluid interaction between the distribution cavity and the battery cavity can be prevented, namely, fluid in the distribution cavity cannot enter the battery cavity, and fluid in the battery cavity cannot enter the distribution cavity. At the same time, the fluid in the external environment is prevented from entering the battery cavity or the power distribution cavity. Wherein the fluid may be a gas or a liquid.

When the battery module 20 is out of control, the battery module 20 generates electrolyte vapor, and the electrolyte vapor is contained in the sealed battery cavity and cannot enter the power distribution cavity, so that the high-voltage arc discharge risk of the power distributor 30 is avoided, and the safety of the battery pack is improved.

The cooling piece can be arranged in the battery cavity, and is in direct contact with the battery module to perform heat transfer between the cooling piece and the battery module; alternatively, the cooling member is coupled to the inside of the cavity wall of the battery cavity, and the cooling member is in indirect contact with the battery module, with heat transferred therebetween. Therefore, the temperature of the battery cavity can be reduced, and the accident that the battery module burns or explodes due to overhigh temperature is avoided.

In practical application, at cooling member and battery module heat transfer in-process, the comdenstion water can appear in the distribution chamber, and the comdenstion water makes the distribution chamber moist, easily leads to the distributor to produce high voltage and draws the arc risk.

Based on this, place the heat preservation piece 40 at the distribution chamber, protection piece 40 contacts with distributor 30, and above-mentioned comdenstion water is absorbed to heat preservation piece 40 for the distribution chamber is in dry environment all the time, avoids distributor 30 to appear drawing the arc condition risk, improves battery package security.

In summary, in this embodiment, the battery cavity and the power distribution cavity are separately provided, and the battery cavity and the power distribution cavity are closed spaces, so that fluid interaction between the battery cavity and the power distribution cavity is prevented, and interaction between the battery cavity and the power distribution cavity is avoided; meanwhile, the heat preservation piece is arranged in the power distribution cavity, so that the probability of high-voltage arc discharge risk of the power distributor is reduced, and the safety of the battery pack is improved.

In some embodiments of the present utility model, referring to fig. 1, a case 10 includes a body 11 and a cover 12, the body 11 is provided with a battery compartment 101 and a distribution compartment 102,

the cover 12 includes a first portion covering the opening of the battery jar 101 to form the battery cavity and a second portion covering the opening of the distribution jar 102 to form the upper distribution cavity. The first part is fixedly arranged at the opening of the battery tank 101, and the second part is detachably arranged at the opening of the power distribution tank 102.

In practical application, the distribution groove 102 is not only provided with the distributor 30, but also other parts can be provided with the distribution groove 102, so that the battery pack is compact in structure and small in design.

Based on this, the second portion is removably mounted to the opening of the distribution box 102, which facilitates later maintenance and repair of the distributor 30 and related parts.

The second part is detachably arranged at the opening of the distribution groove 102, that is to say, the second part covers the opening of the distribution groove 102, and the second part and the opening can be in threaded connection; or the second part is covered on the opening of the power distribution groove 102, and the second part and the opening can be connected in an embedded way; alternatively, the second portion may be disposed over the opening of the distribution chute 102, and other suitable means may be employed therebetween.

In addition, the first part is fixedly installed at the opening of the battery jar 101, that is, the first part covers the opening of the battery jar 101, and the first part and the opening of the battery jar 101 can be connected in an adhesive manner; or the first part covers the opening of the battery groove 101, and the first part and the opening can be welded and connected; alternatively, the first portion may be disposed over the opening of the battery compartment 101, and other suitable means may be employed therebetween.

In some embodiments of the present utility model, as shown in fig. 6, the cover 12 includes a first plate 121 and a second plate 122, the first plate 121 is provided with a hollow 1213, the orthographic projection of the power distribution groove 102 on the first plate 121 coincides with the hollow 1213, the second plate 122 is detachably covered on the hollow 1213 of the first plate 121,

the first portion is configured such that the first plate 121 removes the remaining portion of the hollow portion 1213, and the second portion is configured as the second plate 122.

It should be noted that, the first plate 121 is provided with a hollow portion 1213, and the rest of the first plate 121 forms the first portion; the second plate 122 forms the second portion described above.

The second plate 122 is detachably covered on the hollow portion 1213 of the first plate 121, that is, the second plate 122 and the hollow portion 1213 of the first plate 121 may be in threaded connection, or the second plate 122 and the hollow portion 1213 of the first plate 121 may be in inserted connection, or the second plate 122 and the hollow portion 1213 of the first plate 121 may be in other suitable manners. The cover 12 is simple in structure and low in manufacturing cost.

Of course, it will be appreciated that other suitable arrangements of the cover 12 than those described above exist, for example, the cover 12 includes a third plate for covering the battery compartment 101 and a fourth plate for covering the power distribution compartment 102, which are hinged to each other. The first portion is configured as a third plate, and the second portion is configured as a fourth plate. This embodiment is not exemplified.

In some embodiments of the present utility model, the second sealing member 52 is sandwiched between the second plate 122 and the hollowed out portion 1213 of the first plate 121.

In practical applications, considering that the second plate 122 needs to be disassembled several times, the sealing performance of the second plate 122 to the distribution groove 102 will be affected, so the second sealing member 52 is disposed between the second plate 122 and the hollow portion 1213 of the first plate 121, which can keep the distribution groove 102 to have good sealing performance all the time. The second seal 52 may be a rubber seal. The second sealing member 52 may be screwed to the hollow portion 1213, or may be adhered to the hollow portion 1213.

In some embodiments of the present utility model, as shown in fig. 3 and 4, the body has a receiving groove, the battery pack further includes a first partition plate 61 and a second partition plate 62 disposed in the receiving groove, the first partition plate 61 dividing the receiving groove to form a battery groove 101 and a distribution groove 102, the second partition plate 62 dividing the battery groove 101 to form a battery module region 1011, the first and second partition plates being integrally formed with the receiving groove, or the first and second partition plates being adhered to the receiving groove.

It will be appreciated that the first partition plate 61 divides the receiving groove to form the battery container 101 and the distribution groove 102, and the second partition plate 62 divides the battery container 101 to form the battery module region 1011.

The first partition plate 61 may be integrally formed with the receiving groove, or the edge of the first partition plate 61 may be coated with a gel, the first partition plate 61 may be adhered to the receiving groove, and the gel may seal a minute gap between the first partition plate 61 and the receiving groove. By the arrangement, no channel for circulation exists between the distribution groove 102 and the battery groove 101, and fluid interaction between the battery cavity and the distribution cavity is avoided.

Of course, the second partition plate 62 may be integrally formed with the accommodating groove, or the edge of the second partition plate 62 is coated with glue, the second partition plate 62 is adhered to the accommodating groove, and the glue seals the micro gap between the second partition plate 62 and the accommodating groove. By the arrangement, heat transfer between two adjacent battery modules 20 can be restrained, so that the temperatures of the battery modules 20 are equivalent, and the battery pack temperature equalizing effect can be realized.

In some embodiments of the utility model, as shown in fig. 2-6, the first portion is adhesively attached to the opening of the battery well 101 and the two are threadably attached.

In a specific embodiment, the surface of the second partition plate 62 facing the first plate body 121 is provided with a glue groove 621, and the glue groove 621 is used for filling glue. When the first plate 121 is adhesively connected with the opening of the battery container 101, the excessive glue is prevented from overflowing into the battery container 101, and affecting the battery module 20.

Further, the first plate body 121 is provided with a plurality of first through holes 1211, and the plurality of first through holes 1211 are arranged in an annular array at an edge of the first plate body 121. Meanwhile, a plurality of first through holes 1211 are also provided in the region of the first plate body 121 facing the second partition plate 62.

Correspondingly, a plurality of first screw holes 111 are provided on the surface of the side wall of the accommodating groove facing the first cover 12, and at the same time, a third screw hole 622 is provided on the surface of the second partition plate 62 facing the first plate 121.

A fastener (e.g., a bolt) passes through the first through hole 1211, is screwed with the first and third screw holes 111 and 622, and fastens the first plate 121 to the opening of the battery case 101.

By the arrangement mode, the battery cavity can be guaranteed to have good sealing performance, and electrolyte steam generated by the battery module 20 is prevented from overflowing the battery cavity.

In some embodiments of the utility model, the second portion is threadably coupled to the opening of the distribution groove 102, as shown in fig. 6.

In a specific embodiment, the second plate 122 is provided with a plurality of second through holes 1221. The plurality of second through holes 1221 are arranged in an annular array at an edge of the second plate 122.

Correspondingly, a plurality of second screw holes 1212 are provided around the hollow portion 1213 of the first plate 121. The fastener (for example, a bolt) passes through the second through hole 1221 and is in threaded connection with the second threaded hole 1212, so as to fasten the second plate 122 at the hollowed-out position, so that the power distribution cavity is a closed space.

Further, a first sealing member 51 is disposed at the opening of the power distribution groove 102, and the first sealing member 51 may be a sealing ring made of rubber material. The first seal 51 may be threaded into the opening of the distribution box 102 or may be bonded into the opening of the distribution box 102. The arrangement ensures that the distribution cavity has good sealing performance on one hand; on the other hand, the fixed first seal 51 can avoid affecting the assembly of the first plate 121.

Of course, it is understood that the first sealing member 51 may be connected to the surface of the hollowed-out portion 1213 of the first plate 121 facing the power distribution groove 102.

In some embodiments of the present utility model, as shown in fig. 1, the cavity wall of the battery cavity includes a bottom wall, the bottom wall is provided with a cavity structure, the cooling member is disposed in the cavity structure, and the battery module 20 is attached to the bottom wall.

The bottom wall, that is, the bottom of the battery container 101, and the bottom of the battery container 101 has a cavity structure. The cooling piece is a cooling plate which is arranged in the cavity structure. The cavity structure is provided with a water inlet nozzle and a water outlet nozzle, so that a circulation loop of cooling liquid is formed, and the battery module is radiated.

According to the arrangement mode, the cooling piece is prevented from occupying the space of the battery cavity, more battery modules can be arranged in the battery cavity, and the capacity of the battery pack is improved.

In some embodiments of the present utility model, the insulating member 40 is insulating cotton that is disposed at the bottom of the power distribution chamber.

It will be appreciated that the bottom of the distribution chamber, i.e., the bottom of the distribution tank 102. The heat insulation cotton has good heat insulation property and lighter material, and is beneficial to reducing the overall weight of the battery pack. Meanwhile, the heat insulation cotton at the bottom of the distribution groove 102 can increase buffering, so that collision between the distributor 30 and the distribution groove 102 is avoided.

Of course, it will be appreciated that other materials of the insulating cotton may be selected in other implementations, and the material of the insulating cotton is not particularly limited herein.

Further, the thickness of the heat preservation cotton is 2-5mm. Preferably, the insulation cotton has a thickness of 3mm.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

In the description of the utility model, a "first feature" or "second feature" may include one or more of such features.

In the description of the present utility model, "plurality" means two or more.

In the description of the utility model, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other by another feature therebetween.

In the description of the utility model, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery pack, comprising:

a battery module (20);

a distributor (30);

the power distribution box comprises a box body (10), wherein the box body (10) is provided with a battery cavity and a power distribution cavity which are independent and airtight, the power distributor (30) is arranged in the power distribution cavity, and the battery module (20) is arranged in the battery cavity;

the cooling piece is arranged in the battery cavity or the cavity wall of the battery cavity, and is in heat transfer connection with the battery module (20);

the heat preservation piece (40), heat preservation piece (40) set up in the distribution chamber, heat preservation piece (40) with distributor (30) contact.

2. The battery pack according to claim 1, wherein the case (10) includes a body (11) and a cover (12), the body (11) is provided with a battery compartment (101) and a distribution compartment (102),

the cover body (12) comprises a first part and a second part, wherein the first part covers the opening of the battery groove (101) to form the battery cavity, the second part covers the opening of the power distribution groove (102) to form the power distribution cavity, the first part is fixedly installed in the opening of the battery groove (101), and the second part is detachably installed in the opening of the power distribution groove (102).

3. The battery pack of claim 2, wherein the second portion is threadably coupled to the opening of the distribution slot (102).

4. A battery pack according to claim 3, wherein a first sealing member (51) is provided between the second portion and the opening of the distribution tank (102), the first sealing member (51) being connected to the surface of the second portion facing the distribution tank (102) or the opening of the distribution tank (102).

5. The battery pack according to claim 2, wherein the first portion is adhesively connected to the opening of the battery compartment (101) and is threadably connected thereto.

6. The battery pack according to claim 2, wherein the body (11) has a receiving groove, the battery pack further comprising a first partition plate (61), a second partition plate (62) provided in the receiving groove,

the first partition plate (61) divides the accommodating groove to form the battery groove (101) and the distribution groove (102), the second partition plate (62) divides the battery groove (101) to form a battery module area (1011), and the first partition plate and the accommodating groove are integrally formed, or the first partition plate and the second partition plate are adhered to the accommodating groove.

7. The battery pack according to claim 2, wherein the cover body (12) comprises a first plate body (121) and a second plate body (122), the first plate body (121) is provided with a hollowed-out portion (1213), the orthographic projection of the distribution groove (102) on the first plate body (121) coincides with the hollowed-out portion (1213), the second plate body (122) is detachably covered on the hollowed-out portion (1213) of the first plate body (121),

the first part is configured such that the first plate body (121) removes the remaining part of the hollowed-out portion (1213), and the second part is configured as the second plate body (122).

8. The battery pack according to claim 7, wherein a second seal member (52) is interposed between the second plate body (122) and the hollowed-out portion (1213) of the first plate body (121).

9. The battery pack according to any one of claims 1-8, wherein the insulating member (40) is insulating cotton, the insulating cotton being disposed at the bottom of the distribution chamber.

10. The battery pack according to any one of claims 1-8, wherein the cavity wall of the battery cavity comprises a bottom wall provided with a cavity structure, the cooling member is provided in the cavity structure, and the battery module (20) is attached to the bottom wall.