CN216054971U

CN216054971U - Battery pack

Info

Publication number: CN216054971U
Application number: CN202121666478.XU
Authority: CN
Inventors: 姚丽君; 梁记卫; 陈冲
Original assignee: Envision Power Technology Jiangsu Co Ltd; Envision Ruitai Power Technology Shanghai Co Ltd
Current assignee: Envision Power Technology Jiangsu Co Ltd; Envision Ruitai Power Technology Shanghai Co Ltd
Priority date: 2021-07-21
Filing date: 2021-07-21
Publication date: 2022-03-15
Anticipated expiration: 2031-07-21

Abstract

The utility model discloses a battery pack, comprising: the battery pack comprises a box body, at least one row of battery modules and a fixing piece, wherein an accommodating cavity is formed in the box body; the battery modules are provided with a plurality of battery modules, each battery module is provided with a pair of electrodes, the pair of electrodes are oppositely arranged on two sides of the battery module, the battery modules in one row are sequentially arranged in the box body in parallel along the opposite direction of the pair of electrodes, one electrode of each battery module is oppositely arranged with one electrode of the adjacent battery module, and the electrodes of the two adjacent battery modules are electrically connected through an electric connector; the fixing member is sandwiched between two adjacent battery modules in a row of the battery modules, supports the electrical connection member, and is made of a heat-resistant insulating material. Since the fixing member is supported by the heat-resistant insulating material, it is not easily melted by heat, and the displacement of the electrical connection member can be prevented, so that the safety of the battery pack can be improved. In addition, the fixing piece is clamped between the two adjacent battery modules, so that the fixing piece can be fixed more firmly, the probability of displacement of the fixing piece is reduced, and the probability of displacement of the electric connecting piece is further reduced.

Description

Battery pack

Technical Field

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

Background

With the rapid development of electric vehicles, the requirements for energy density and safety of battery packs are higher and higher, and the battery pack is a trend of increasing the energy density of the battery pack and reducing the cost.

The inventor finds that the current battery pack is easy to generate thermal runaway when the battery pack is improperly used, and particularly in summer, the battery pack can generate serious thermal runaway due to outdoor high temperature and high temperature generated in the battery pack when a vehicle runs, and even a fire can be caused to cause spontaneous combustion of the whole vehicle.

SUMMERY OF THE UTILITY MODEL

An embodiment of the present invention is directed to a battery pack, which reduces the occurrence of thermal runaway of the battery pack and improves the safety of the battery pack.

In order to solve the above technical problem, an embodiment of the present invention provides a battery pack, including:

the box body is internally provided with an accommodating cavity;

the battery module comprises a plurality of battery modules, the battery modules comprise a pair of electrodes, the electrodes are oppositely arranged on two sides of the battery modules, the battery modules are sequentially arranged in the accommodating cavity in parallel along the opposite direction of the electrodes, one electrode of each battery module is oppositely arranged with one electrode of the adjacent battery module, and one electrode of each battery module is electrically connected with one electrode of the adjacent battery module through an electric connecting piece;

the fixing piece is clamped between two adjacent battery modules in the at least one row of battery modules, the fixing piece supports the electric connecting piece, and the fixing piece is made of heat-resistant insulating materials.

Compared with the prior art, the inventor finds that the thermal runaway of the battery pack is mainly caused by that the electric connecting piece electrically connected with the electrode is displaced to contact with other conductive pieces after the electrode seat for supporting the electrode of the battery module is melted by heat, so that the short circuit in the battery pack is caused, the improved battery pack comprises a fixing piece made of a heat-resistant insulating material, the fixing piece is used for fixing the electric connecting piece, and the fixing piece is supported by the heat-resistant insulating material, so that the heat melting is not easy to occur, the displacement of the electric connecting piece can be avoided, and the safety of the battery pack can be improved. In addition, the fixing piece is clamped between the two adjacent battery modules, so that the fixing piece can be fixed more firmly, the probability of displacement of the fixing piece is reduced, and the probability of displacement of the electric connecting piece is further reduced.

In one embodiment, the fixing member is disposed between any two adjacent battery modules in the at least one row of battery modules.

In one embodiment, the heat-resistant insulating material is any one of marble, ceramic, quartz and mica.

In one embodiment, the fixing member includes a fixing plate, the fixing plate is parallel to the battery modules and is sandwiched between two adjacent battery modules, a groove penetrating through the fixing plate is formed in the fixing plate, and the electrical connector is clamped in the groove.

In one embodiment, the groove is opened on the upper end surface of the fixing plate.

In one embodiment, the groove is opened on the side edge of the fixing plate.

In one embodiment, the fixing member further comprises a supporting plate for supporting the electrical connector, the battery module is provided with a connecting position for accommodating the connector for connecting the battery module to the box body, the connecting position is located below the electrical connector, and the supporting plate is arranged at the connecting position.

In one embodiment, the connector secures the support plate.

In one embodiment, the support plate comprises: the first plate section is arranged on the connecting position, and the second plate section is formed by protruding and extending from the first plate section and supports the electric connecting piece.

In one embodiment, the second plate section end has a positioning groove, and the electrical connector is located in the positioning groove.

Drawings

One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.

Fig. 1 is a schematic structural diagram of a battery pack according to an embodiment of the utility model;

FIG. 2 is a schematic view of the battery pack of FIG. 1 with the cover removed;

fig. 3 is a schematic structural view of two battery modules according to the present invention after assembly;

FIG. 4 is an enlarged view at A in FIG. 3;

FIG. 5 is a schematic structural diagram of a fixing plate according to an embodiment of the present invention;

FIG. 6 is a schematic view of a mounting plate and an electrical connector of an embodiment of the present invention after assembly;

fig. 7 is a schematic structural view of two battery modules according to the present invention after assembly;

FIG. 8 is an enlarged view at B in FIG. 7;

FIG. 9 is a schematic view of the mounting plate and the supporting plate after assembly with the electrical connector according to the embodiment of the present invention;

FIG. 10 is a schematic view of the structure at C in FIG. 9;

fig. 11 is a schematic structural view of a support plate in an embodiment of the present invention.

Description of reference numerals:

1. a box body; 11. a tank body; 12. a box cover; 13. an accommodating cavity; 2. a battery module; 21. an electrode; 211. a connecting screw; 22. an electrode holder; 23. a connection bit; 24. a connecting member; 25. a metal end plate; 3. a fixing member; 31. a fixing plate; 311. a groove; 32. a support plate; 321. a first plate section; 3211. a through hole; 322. a second plate section; 3221. positioning a groove; 4. an electrical connection; 5. an explosion-proof valve.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present application in various embodiments of the present invention. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments.

In the following description, for the purposes of illustrating various disclosed embodiments, certain specific details are set forth in order to provide a thorough understanding of the various disclosed embodiments. One skilled in the relevant art will recognize, however, that the embodiments may be practiced without one or more of the specific details. In other instances, well-known devices, structures and techniques associated with this application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

Throughout the specification and claims, the word "comprise" and variations thereof, such as "comprises" and "comprising," are to be understood as an open, inclusive meaning, i.e., as being interpreted to mean "including, but not limited to," unless the context requires otherwise.

The embodiments of the present invention will be described in detail below with reference to the accompanying drawings in order to more clearly understand the objects, features and advantages of the present invention. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but are merely intended to illustrate the spirit of the technical solution of the present invention.

Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

As used in this specification and the appended claims, the singular forms "a", "an", and "the" include plural referents unless the context clearly dictates otherwise. It should be noted that the term "or" is generally employed in its sense including "and/or" unless the context clearly dictates otherwise.

In the following description, for the purposes of clearly illustrating the structure and operation of the present invention, directional terms will be used, but terms such as "front", "rear", "left", "right", "outer", "inner", "outer", "inward", "upper", "lower", etc. should be construed as words of convenience and should not be construed as limiting terms.

An embodiment of the present invention will be described below with reference to the accompanying drawings, which, as shown in fig. 1 to 4, includes: the battery module comprises a box body 1, at least one row of battery modules 2 and a fixing piece 3, wherein an accommodating cavity 13 is formed in the box body 1. At least one row of battery modules 2 has a plurality of battery modules 2, the battery modules 2 have a pair of electrodes 21, and the pair of electrodes 21 are oppositely disposed at two sides of the battery modules 2. In some embodiments, a pair of electrodes 21 is provided at one end of the battery module 2. The battery modules 2 are arranged in parallel in the housing cavity 13 of the case 1 in the opposite direction of the pair of electrodes 21. An electrode 21 of battery module 2 sets up with an electrode 21 of adjacent battery module 2 relatively, and the electrode 21 of two adjacent battery modules 2 passes through electric connector 4 electric connection, and battery module 2 sets up side by side like this to the electrode 21 of two battery modules 2 sets up relatively, makes things convenient for two electrodes 21 on two battery modules 2 to pass through electric connector 4 electric connection.

The fixing member 3 is sandwiched between two adjacent battery modules 2 of a row of the battery modules 2, the fixing member 3 is sandwiched and fixed by the two battery modules 2, the fixing member 3 supports the electrical connection member 4 to prevent the electrical connection member 4 from being displaced, and the fixing member 3 is made of a heat-resistant insulating material.

As shown in fig. 3 and 4, the two electrodes 21 of the battery module 2, one electrode 21 being a positive electrode, the other electrode 21 being a negative electrode, the positive electrode 21 of one battery module 2 and the negative electrode 21 of the adjacent battery module 2 are electrically connected together by the electrical connector 4, and the negative electrode 21 of the battery module 2 and the positive electrode 21 of the adjacent battery module 2 are also electrically connected together by the electrical connector 4. The electrical connector 4 may be an electrical connector such as a copper sheet, an iron sheet or an aluminum sheet.

As shown in fig. 4, in the present embodiment, the electrode 21 includes: the electrode lug is hidden in the battery module 2, and the connecting screw 211 is respectively electrically connected with the electrode lug and the electric connecting piece 4, and the electric connecting piece 4 is fixed on the electrode seat 22 by the connecting screw 211 and is electrically connected with the electric connecting piece 4. In order to facilitate the electrical connection between the electrical connection members 4 and the electrodes 21, the battery modules 2 generally use the electrode holders 22 to support the electrodes 21, and the electrical connection members 4 are electrically connected to the electrodes 21 of two adjacent battery modules 2. The inventors have found that a large amount of heat is generated when the thermal runaway occurs in the battery cells in the battery module 2 during the use of the battery module 2, and the abnormal heat is transferred to the electrode holder 22 through the electrode 21. Since the electrode holder 22 is made of plastic, the abnormal heat may cause the electrode holder 22 to melt, especially in hot summer. After the electrode holder 22 is melted by heat, the electric connecting member 4 is moved down to be in contact with and electrically connected to an external metal member such as a metal end plate 25 of the battery module 2, thereby causing a short circuit of the battery module 2. Chain reaction can occur after the battery module 2 is short-circuited, and the whole battery pack can be thermally out of control in serious conditions, so that fire disasters can be caused.

The present application includes a fixing member 3, the fixing member 3 is made of a heat-resistant insulating material, and the fixing member 3 fixes an electric connecting member 4. Because the fixing member 3 is supported by the heat-resistant insulating material, it is not easily melted by heat, and the displacement of the electric connecting member 4 can be avoided, so that the safety of the battery pack can be improved, and the heat-resistant insulating material is any one of marble, ceramic, quartz and mica. In addition, the fixing piece 3 is clamped between the two adjacent battery modules 2, so that the fixing piece can be fixed more firmly, the probability of displacement of the fixing piece 3 is reduced, and the probability of displacement of the electric connecting piece 4 is further reduced.

As shown in fig. 2, in the present embodiment, there are two rows of battery modules 2 in total, and a fixing member 3 is disposed between any two adjacent battery modules 2 of one row of battery modules 2, the fixing member 3 being used to support an electrical connector 4 electrically connected to the two battery modules 2.

Specifically, as shown in fig. 3 to 6, the fixing member 3 includes a fixing plate 31, the fixing plate 31 is disposed parallel to the battery modules 2 and sandwiched between two adjacent battery modules 2, a groove 311 penetrating through the fixing plate 31 is formed in the fixing plate 31, and the electrical connector 4 is clamped in the groove 311. Specifically, in the present embodiment, the groove 311 is formed on the side edge of the fixing plate 31, but of course, in some embodiments, the groove 311 may also be formed on the upper end surface of the fixing plate 31.

In addition, the fixing member 3 further includes a supporting plate 32 for supporting the electrical connection member 4, as shown in fig. 7 to 11, the battery module 2 is provided with a connection member 24 for fixedly connecting with the case 1, the battery module 2 is provided with a connection site 23 for accommodating the connection member 24, the connection site 23 is located outside the electrode 21 and is disposed opposite to one electrode 21 of the above-mentioned adjacent battery module 2, and the connection site 23 is also located below the connection member 24. The support plate 32 and the connecting member 24 are arranged on the connecting position 23 of the battery module 2, so that the support plate 32 can be placed at the existing connecting position 23 reserved for the connecting member 24, and the additional arrangement of the position on the battery module 2 for placing the support plate 32 is avoided.

In addition, the connecting member 24 is preferably capable of fixing the support plate 32, and in particular, in the present embodiment, the connecting member 24 is a screw, and the battery module 2 can be fixed in the case 1 by screwing the screw to the bottom of the case 1.

As shown in fig. 10 and 11, the support plate 32 includes: a first plate section 321 disposed on the connecting position 23 and a second plate section 322 extending upward from the first plate section 321, wherein the second plate section 322 supports the electrical connector 4. The first plate 321 is provided with a through hole 3211, and a screw passes through the through hole 3211 and then is connected to the battery module 2 and the bottom of the case 1, thereby fixing the support plate 32 to the battery module 2.

In addition, preferably, in order to facilitate fixing the electrical connector 4, as shown in fig. 11, the end of the second board section 322 has a positioning groove 3221, and the electrical connector 4 is located in the positioning groove 3221.

In the present embodiment, as shown in fig. 1 and 2, the case 1 includes: case body 11 and case lid 12 have holding chamber 13 in the case body 11, and each battery module 2, mounting 3 and thermal-insulated subassembly all set up in holding chamber 13, and case lid 12 lid is on each battery module 2 to with case body 11 fixed connection, closed holding chamber 13. Simultaneously, case body 11 still all sets up two explosion-proof valves 5 along the both ends of each battery module 2 array orientation, and the heat in the battery package can be discharged through explosion-proof valve 5 and go.

While the preferred embodiments of the present invention have been described in detail above, it should be understood that aspects of the embodiments can be modified, if necessary, to employ aspects, features and concepts of the various patents, applications and publications to provide yet further embodiments.

These and other changes can be made to the embodiments in light of the above detailed description. In general, in the claims, the terms used should not be construed to be limited to the specific embodiments disclosed in the specification and the claims, but should be construed to include all possible embodiments along with the full scope of equivalents to which such claims are entitled.

It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the utility model, and that various changes in form and details may be made therein without departing from the spirit and scope of the utility model in practice.

Claims

1. A battery pack, comprising:

the box body is internally provided with an accommodating cavity;

the battery module comprises a plurality of battery modules, the battery modules comprise a pair of electrodes, the electrodes are oppositely arranged on two sides of the battery modules, the battery modules are sequentially arranged in the accommodating cavity in parallel along the opposite direction of the electrodes, one electrode of each battery module is oppositely arranged with one electrode of the adjacent battery module, and one electrode of each battery module is electrically connected with one electrode of the adjacent battery module through an electric connector;

2. The battery pack according to claim 1, wherein the fixing member is provided between any adjacent two of the battery modules in the at least one row of battery modules.

3. The battery pack according to claim 1, wherein the heat-resistant insulating material is any one of marble, ceramic, quartz, and mica.

4. The battery pack according to claim 1, wherein the fixing member includes a fixing plate, the fixing plate is parallel to the battery modules and is sandwiched between two adjacent battery modules, a groove is formed in the fixing plate and penetrates through the fixing plate, and the electrical connector is clamped in the groove.

5. The battery pack according to claim 4, wherein the groove is provided on the upper end surface of the fixing plate.

6. The battery pack of claim 4, wherein the groove is formed in a side edge of the fixing plate.

7. The battery pack according to claim 1, wherein the fixing member further includes a support plate supporting the electrical connection member, the battery module is provided with a connection site for receiving a connection member for connecting the battery module to the case, the connection site is located below the electrical connection member, and the support plate is disposed at the connection site.

8. The battery pack of claim 7, wherein the connector secures the support plate.

9. The battery pack of claim 8, wherein the support plate comprises: the first plate section is arranged on the connecting position, and the second plate section is formed by protruding and extending from the first plate section and supports the electric connecting piece.

10. The battery pack of claim 9, wherein the second plate segment is provided with a detent at an end thereof, and the electrical connector is located within the detent.