CN112510322A

CN112510322A - Battery module and battery pack

Info

Publication number: CN112510322A
Application number: CN202011323314.7A
Authority: CN
Inventors: 林水杉; 卢耀智; 郭继鹏
Original assignee: Shanghai Cenat New Energy Co Ltd
Current assignee: Shanghai Cenat New Energy Co Ltd
Priority date: 2020-11-23
Filing date: 2020-11-23
Publication date: 2021-03-16

Abstract

The invention relates to the field of batteries, and provides a battery module and a battery pack, wherein the battery module comprises a plurality of electric core assemblies, at least one interval structure and at least one tab bracket, the plurality of electric core assemblies are arranged in an array along the thickness direction of the electric core assemblies, and each electric core assembly comprises at least one electric core unit; the spacing structure is arranged between two adjacent electric core components, and the end part of the spacing structure is arranged in a protruding way relative to the end surface of the electric core unit; the lug support is arranged at one end of the plurality of electric core components, at least one first insertion groove is formed in one side, facing the spacing structure, of the lug support, and the first insertion groove is in insertion fit with the end portion of the spacing structure. Based on above-mentioned structure, when utmost point ear support received the extrusion, utmost point ear support can extrude rather than first inserting groove grafting complex interval structure, and can not directly extrude the core subassembly, and based on this, interval structure can bear great extrusion force for the core subassembly only needs to bear less extrusion force, thereby can slow down utmost point ear support to the extrusion degree of core subassembly.

Description

Battery module and battery pack

Technical Field

The invention belongs to the technical field of batteries, and particularly relates to a battery module and a battery pack.

Background

The battery module generally includes a plurality of cell assemblies arranged in an array in a thickness direction, a tab holder coupled to one end of each of the cell assemblies, and an end plate coupled to one side of the tab holder facing away from the cell assemblies. However, based on above-mentioned structure, when the end plate received the extrusion, the end plate can extrude extremely ear of the utmost point support, and then ear of the utmost point support can be direct transmits the extrusion force to each electricity core subassembly, causes the electricity core subassembly consequently easily and impaired, may lead to battery module safety risk to appear even.

Disclosure of Invention

The embodiment of the invention aims to provide a battery module to solve the technical problem that a tab support of the conventional battery module is easy to directly extrude to a battery core assembly when an end plate is extruded.

In order to achieve the purpose, the invention adopts the technical scheme that: a battery module, comprising:

a plurality of cell assemblies arranged in an array in a thickness direction thereof, the cell assemblies including at least one cell unit arranged in an array in a thickness direction;

the at least one interval structure is arranged between two adjacent electric core assemblies, and the end part of the interval structure is arranged in a protruding way relative to the end surfaces of the electric core units;

the electrode lug support is arranged at one end of the plurality of electrode core components, at least one first insertion groove is formed in one side, facing the spacing structure, of the electrode lug support, and the first insertion groove is in insertion fit with the end portion of the spacing structure.

Through adopting the above-mentioned scheme, when utmost point ear support receives the extrusion, utmost point ear support can be preferred to extrude rather than the relative convex interval structure of first inserting groove grafting complex, and can directly not extrude electric core subassembly, based on this, interval structure can bear the weight of the extrusion force that great most utmost point ear support transmitted comes, so that electric core subassembly only need bear less extrusion force, need not to bear the extrusion force even, thereby can effectively slow down the extrusion degree of utmost point ear support to electric core subassembly, can ensure and improve electric core subassembly's performance and security performance to a certain extent.

In addition, through adopting above-mentioned scheme, go back accessible and first inserting groove grafting complex interval structure, the space that locates different electric core subassemblies is preliminary separated, based on this, when the electric core subassembly of interval structure one side takes place thermal runaway and produces high temperature gas, interval structure can exert certain effect that blocks to high temperature gas basically, in order to prevent high temperature gas from stretching the space to its opposite side fast, thereby can prolong the electric core subassembly of interval structure opposite side to the time that thermal runaway to a certain extent, slow down the thermal runaway condition of battery module to a certain extent, thereby do benefit to the security performance that improves battery module.

In one embodiment, the battery module further comprises at least one end plate, the end plate is arranged on one side of the tab support, which is far away from the electrode assembly, and at least one second insertion groove is formed in one side of the end plate, which faces the tab support;

at least one separation structure used for being in splicing fit with the second splicing groove is convexly arranged on one side, facing the end plate, of the pole lug support.

By adopting the scheme, each separation structure can separate the large space enclosed between the lug support and the end plate into a plurality of opposite small spaces on the basis of not influencing the power connection relation required to be established between the adjacent electric core components, on the basis, even if the electric core components corresponding to the small spaces formed by the separation structures are subjected to thermal runaway and high-temperature gas generated due to the thermal runaway is diffused into the small spaces formed by the separation structures through the through holes, the separation structures can also exert certain blocking effect on the high-temperature gas to prevent the high-temperature gas from rapidly spreading to the small spaces on the other side of the separation structures, further prevent the high-temperature gas from spreading to the electric core components corresponding to the small spaces on the other side of the separation structures, further prolong the time for the electric core components on the other side of the separation structures to generate the thermal runaway and further slow down the thermal runaway condition of the battery module, thereby being beneficial to further improving the safety performance of the battery module.

In addition, through adopting above-mentioned scheme, still can exert certain support effect to the end plate when the end plate receives the extrusion through the partition structure to can further improve battery module's anti extrusion ability.

In one embodiment, the end plate is further provided with at least one exhaust channel communicated to the outside on two opposite sides of the second insertion groove.

Through adopting above-mentioned scheme, exhaust passage can separate little space and the outside intercommunication that forms with the partition structure, based on this, the electric core subassembly that the little space that forms corresponds takes place thermal runaway when the partition structure separates, and when the high-temperature gas that produces because of thermal runaway diffuses to the partition structure through the cross-under hole and separates the little space that forms, the exhaust passage that the high-temperature gas accessible in the little space corresponds discharges to the outside, based on this, can further reduce the influence of high-temperature gas to other electric core subassemblies, can further prolong the time of other remaining electric core subassemblies thermal runaway, thereby can further slow down the thermal runaway condition of battery module, do benefit to the security performance that further improves battery module.

In one embodiment, the end plate is provided with a first vent hole at the side of the second insertion groove and in the thickness direction of the end plate, the end of the first vent hole far away from the tab holder is connected with a shielding structure, the end plate is further provided with a second vent hole at one side of the end plate far away from the tab holder, the second vent hole is a blind hole, the second vent hole is arranged at the side of the first vent hole and communicated with the first vent hole, and the second vent hole and the first vent hole form a vent channel together.

Through adopting above-mentioned scheme, the zigzag exhaust passage that accessible second exhaust hole and first exhaust hole formed jointly realizes high-temperature gas's emission to can correspondingly reduce high-temperature gas to other electric core subassemblies's influence, the time of corresponding extension other electric core subassemblies thermal runaway, and still can effectively prevent that relevant personnel's finger from inserting exhaust passage through sheltering from the structure, thereby do benefit to the security performance that further improves battery module, and can accord with battery module's manufacturing standard basically.

In one embodiment, the shielding structure is made of plastic.

Through adopting above-mentioned scheme, can be when the temperature through exhaust passage exhaust high-temperature gas is higher, make and shelter from the structure and can melt under high temperature, based on this, can make the sectional area of exhaust passage's outlet side enlarge, and can make high-temperature gas directly arrange through exhaust passage, thereby can enlarge the displacement in exhaust passage's unit interval, can further reduce high-temperature gas to the influence of other electric core subassemblies, can further prolong the time of other electric core subassemblies thermal runaway, thereby can further slow down the thermal runaway condition of battery module, do benefit to the security performance that further improves battery module.

In one embodiment, the end plate is further convexly provided with a supporting protrusion on one side facing the tab support, the tab support is provided with a third insertion groove on one side facing the end plate, and the supporting protrusion is inserted into the third insertion groove and supports the tab support.

Through adopting above-mentioned scheme, can be on the fixed basis of the relative position of assurance end plate and utmost point ear support, further through supporting the grafting cooperation of holding arch and third inserting groove to make the end plate also support to hold to utmost point ear support through supporting the arch in the middle zone on the thickness direction of electric core subassembly, based on this, can further ensure and improve the effect of supporting each other, supporting each other between end plate and the utmost point ear support, thereby can further improve the anti extrusion ability of battery module.

In one embodiment, the holding protrusion is aligned with the spacing structure located in the middle of the battery module.

By adopting the scheme, on one hand, the abutting bulge can abut against the middle of the battery module, so that the middle anti-extrusion capability of the battery module with the weakest original anti-extrusion capability can be effectively enhanced; on the other hand, support and hold the arch and support and hold to interval structure, and not electric core subassembly to can further reduce electric core subassembly and receive direct extrusion's risk when the end plate receives the extrusion, thereby do benefit to the performance and the security performance that further improve electric core subassembly.

In one embodiment, the spacer structure positioned in the middle of the battery module includes a heat conductive frame, and a buffer plate and a heat insulation plate provided inside the heat conductive frame.

Through adopting above-mentioned scheme, can make the intermediate interval structure of battery module synthesize and have better heat conductivility, heat-proof quality and shock-absorbing capacity to do benefit to the performance and the security performance of further guarantee battery module.

In one embodiment, the number of the heat insulation plates is two, the two heat insulation plates are respectively arranged at two opposite sides of the buffer plate in the thickness direction, and the heat conduction frame comprises two heat conduction vertical plates respectively arranged at one sides of the two heat insulation plates, which are far away from the buffer plate, and a heat conduction transverse plate connected to the same sides of the two heat conduction vertical plates.

By adopting the scheme, the heat of the corresponding electric core assembly can be directly conducted to the heat-conducting transverse plate through the two heat-conducting vertical plates which are directly abutted against the side surfaces of the electric core assembly, so that the heat conduction and the heat dissipation of the electric core assembly are facilitated; then, the heat of the electric core components at the two sides of the interval structure is blocked by the two heat insulation plates so as to prevent the thermal runaway spread caused by the spread of the heat; finally, the expansion and the extrusion of the battery module in the thickness direction of the electric core component are absorbed and buffered through a buffer plate arranged between the two heat insulation plates; thereby further improving the service performance, the service life and the safety performance of the battery module.

In one embodiment, the end part of the heat insulation plate and the end part of the heat conduction vertical plate are arranged in a protruding mode relative to the end part of the buffer plate, and the adjacent heat insulation plate and the heat conduction vertical plate are in plug fit with the first plug groove.

By adopting the scheme, the middle interval structure in the plurality of interval structures can be in plug fit with the first plug-in groove through the heat insulation plate and the heat conduction vertical plate so as to bear most extrusion force when the lug support is extruded, and therefore the effect of reducing the extrusion degree of the lug support to the electric core assembly can be achieved; and based on the buffer board not with the complex setting of pegging graft of first inserting groove, can make the buffer board have great flexible range on the thickness direction of electric core subassembly to can further ensure and improve the buffer effect of buffer board to battery module in the ascending inflation of thickness direction of electric core subassembly, the extrusion condition.

In one embodiment, at least one end of the first insertion groove is disposed through the first insertion groove in the extending direction.

Through adopting above-mentioned scheme, can effectively improve the operation convenience of the grafting cooperation of interval structure and first inserting groove to can correspondingly improve battery module's assembly convenience.

An object of an embodiment of the present invention is to provide a battery pack including at least one battery module.

By adopting the scheme, the battery pack has the advantages of stronger anti-extrusion capacity, lower thermal runaway spreading speed, higher safety performance and the like.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a schematic structural diagram of a battery module according to an embodiment of the present invention;

fig. 2 is a sectional view taken along a-a of the battery module provided in fig. 1;

FIG. 3 is a schematic structural view of a plurality of electrical core assemblies and a plurality of spacer structures provided in FIG. 1;

FIG. 4 is a schematic illustration of the structure of the centrally located spacer structure provided in FIG. 3;

fig. 5 is a first structural schematic diagram of the tab holder provided in fig. 1;

fig. 6 is a structural schematic view two of the tab holder provided in fig. 5;

FIG. 7 is a schematic structural view of the end plate provided in FIG. 1;

fig. 8 is a cross-sectional view along B-B of the end plate provided in fig. 7.

Wherein, in the figures, the respective reference numerals:

100-cell assembly, 110-cell unit, 111-tab; 200-interval structure, 210-heat conducting frame, 211-heat conducting vertical plate, 212-heat conducting horizontal plate, 220-buffer plate and 230-heat insulating plate; 300-a tab support, 301-a first insertion groove, 310-a separation structure, 302-a third insertion groove, 303-a through hole; 400-end plate, 401-second inserting groove, 402-exhaust channel, 4021-first exhaust hole, 4022-second exhaust hole, 410-shielding structure and 420-abutting protrusion; 500-bus bar.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The following describes a specific implementation of the present invention in more detail with reference to specific embodiments:

referring to fig. 2, 3 and 5, an embodiment of the present invention provides a battery module, which includes a plurality of cell assemblies 100, at least one spacing structure 200 and at least one tab holder 300, wherein the plurality of cell assemblies 100 are arranged in an array along a thickness direction a thereof, and the cell assemblies 100 include at least one cell unit 110 arranged in an array along the thickness direction a; the spacing structure 200 is arranged between two adjacent electric core assemblies 100, and the end part of the spacing structure 200 is arranged in a protruding way relative to the end surface of the electric core unit 110; the tab support 300 is disposed at one end of the plurality of cell assemblies 100, at least one first insertion groove 301 is disposed on one side of the tab support 300 facing the partition structure 200, and the first insertion groove 301 is inserted and matched with the end of the partition structure 200.

It should be noted that, the end of the electric core assembly 100 refers to one end of the electric core assembly 100 in the length direction thereof, and thus, the above structure may be disposed at one end or opposite ends of each electric core assembly 100 in the length direction, which is not limited in this embodiment. Correspondingly, the end faces of the cell units 110 can be understood.

A tab 111 is connected to an end of the cell unit 110. The side of the tab holder 300 away from the core assembly 100 supports and fixes at least one busbar 500, and the tab holder 300 is provided with at least one through hole 303 penetrating in the thickness direction. The tabs 111 of the battery cell units 110 can penetrate through the through holes 303 and are connected to the bus bar 500 on the other side of the tab support 300, so as to establish power connection relationships among the battery cell units 110, such as series connection, parallel connection, series-parallel connection and the like.

It should be noted that, in order to better conduct the heat on the side surface of the electric core assembly 100 to the bottom of the electric core assembly 100, a heat conducting structure made of heat conducting material, such as an aluminum plate, can be additionally arranged between the electric core assembly 100 and the electric core assembly 100; similarly, in order to prevent the heat of the electric core assembly 100 from being directly transferred to the adjacent electric core assembly 100, and in order to prevent the rapid spread of thermal runaway, an insulation material made of an insulation material, such as foam, aerogel, etc., may be added between the electric core assembly 100 and the electric core assembly 100. Therefore, according to the practical application scenario, the spacing structure 200 provided in the present embodiment may be a heat conducting structure, a heat insulating structure, a combination of the heat conducting structure and the heat insulating structure, and the like, disposed between the electric core assembly 100 and the electric core assembly 100.

It should be further noted that in the present embodiment, the end portion of the spacing structure 200 is disposed to protrude from the end surface of the battery cell unit 110, that is, the extending length of the spacing structure 200 is relatively longer than the extending length of the battery cell unit 110. And correspondingly, the tab holder 300 is in insertion fit with the protruding end of the spacing structure 200 through the first insertion groove 301. Based on this, the tab holder 300 remains fixed with respect to the electric core assembly 100 and the spacing structure 200, and thus, the above arrangement does not negatively affect the stability and reliability of the power connection between the electric core assembly 100 and the bus bar 500; on the contrary, because utmost point ear support 300 and interval structure 200 butt, nevertheless with the relative interval of electric core subassembly 100, therefore, when utmost point ear support 300 received the extrusion, utmost point ear support 300 can preferentially extrude interval structure 200, and can not directly extrude electric core subassembly 100, and interval structure 200 can bear most extrusion force to can effectively slow down utmost point ear support 300 to electric core subassembly 100's extrusion degree, can ensure and improve electric core subassembly 100's performance and security performance to a certain extent.

That is, through adopting above-mentioned scheme, when utmost point ear support 300 receives the extrusion, utmost point ear support 300 can be preferred to extrude rather than first inserting groove 301 grafting complex relative convex interval structure 200, and can not directly extrude electric core subassembly 100, based on this, interval structure 200 can bear the extrusion force that most utmost point ear support 300 transmitted and come, so that electric core subassembly 100 only need bear less extrusion force, need not to bear the extrusion force even, thereby can effectively slow down the extrusion degree of utmost point ear support 300 to electric core subassembly 100, can ensure and improve electric core subassembly 100's performance and security performance to a certain extent.

In addition, through adopting above-mentioned scheme, still accessible with first inserting groove 301 grafting complex interval structure 200, the space that locates different electric core subassembly 100 is preliminary separated, based on this, when electric core subassembly 100 of interval structure 200 one side takes place thermal runaway and produces high temperature gas, interval structure 200 can exert certain effect that blocks to high temperature gas basically, in order to prevent high temperature gas from stretching to the space of its opposite side fast, thereby can prolong the electric core subassembly 100 of interval structure 200 opposite side to a certain extent and take place the time of thermal runaway, the thermal runaway condition of battery module slows down to a certain extent, thereby do benefit to the security performance who improves battery module.

Optionally, the extension direction of the first plugging slot 301 is parallel to the height direction of the spacing structure 200.

Referring to fig. 2, fig. 6 and fig. 7, in the present embodiment, the battery module further includes at least one end plate 400, the end plate 400 is disposed on a side of the tab holder 300 away from the battery assembly 100, and at least one second insertion groove 401 is disposed on a side of the end plate 400 facing the tab holder 300; the tab holder 300 is provided with at least one separation structure 310 protruding from a side facing the end plate 400 for engagement with a second engagement groove 401.

First, it should be noted that the end plate 400 can provide a certain protection effect for the end portions of the tab holder 300 and the electric core assembly 100, and in particular can protect the bus bar 500 disposed on the side of the tab holder 300 facing the end plate 400; and the end plate 400 can also assist the side plates, the bottom plate, the cover plate and other structural members to compact and normalize the overall layout and the overall structure of the battery module, thereby being beneficial to ensuring the space utilization rate, the volume grouping rate and the energy density of the battery module. The end plate 400 may be an assembly, and the inner side of the end plate 400 facing the bus bar 500 needs to be an insulating structure, so as to prevent the end plate 400 from affecting the power connection relationship between the bus bar 500 and the cell unit 110.

It should be further noted that the tab holder 300 is provided with a separation structure 310 protruding toward the end plate 400, and the separation structure 310 is in plug-in fit with the second insertion groove 401. When the relative positions of the end plate 400 and the tab holder 300 are fixed, each partition structure 310 can partition a large space enclosed between the tab holder 300 and the end plate 400 into a plurality of small spaces, and the arrangement positions of the partition structures 310 are designed on the basis of not affecting the power connection relationship required to be established between the adjacent cell assemblies 100. Illustratively, as shown in fig. 2, there are six electric core assemblies 100, and the ends of three pairs of electric core assemblies 100 are required to be respectively established in power connection relationship, so that two partition structures 310 are provided, and the two partition structures 310 divide a large space enclosed between the tab holder 300 and the end plate 400 into three small spaces.

Therefore, by adopting the above scheme, each partition structure 310 can partition the large space enclosed between the tab holder 300 and the end plate 400 into a plurality of small spaces opposite to each other on the basis of not affecting the power connection relationship required to be established between the adjacent electric core assemblies 100, and based on this, even if the electric core assemblies 100 corresponding to the small spaces formed by the partition structure 310 are thermally runaway and the high-temperature gas generated due to the thermal runaway is diffused into the small spaces formed by the partition structure 310 through the through holes 303, the partition structure 310 can exert a certain blocking effect on the high-temperature gas to prevent the high-temperature gas from rapidly spreading to the small spaces on the other side thereof, and further prevent the high-temperature gas from spreading to the electric core assemblies 100 corresponding to the small spaces on the other side thereof, so that the time for the electric core assemblies 100 on the other side of the partition structure 310 to thermally runaway can be further prolonged, and the thermal runaway condition of the battery module can be further slowed down, thereby being beneficial to further improving the safety performance of the battery module.

In addition, by adopting the above scheme, when the end plate 400 is pressed, the separation structure 310 can also exert a certain supporting effect on the end plate 400, so that the anti-pressing capability of the battery module can be further improved.

Referring to fig. 2, 7 and 8, in the present embodiment, the end plate 400 further has at least one exhaust channel 402 disposed on two opposite sides of the second inserting groove 401 and connected to the outside.

Through adopting above-mentioned scheme, exhaust passage 402 can be with little space and the outside intercommunication of partition structure 310 partition formation, on this basis, electric core subassembly 100 that the little space that separates the formation that forms takes place thermal runaway, and when the high-temperature gas that produces because of thermal runaway diffuses to the little space that partition structure 310 separates the formation through cross-under hole 303, the high-temperature gas accessible of the interior little space corresponding exhaust passage 402 of discharge to the outside, on this basis, can further reduce the influence of high-temperature gas to other electric core subassemblies 100, can further prolong the time of other remaining electric core subassemblies 100 thermal runaway, thereby can further slow down the thermal runaway condition of battery module, do benefit to the security performance that further improves battery module.

Referring to fig. 2, 7 and 8, in this embodiment, a first exhaust hole 4021 is formed at a side of the second insertion groove 401 of the end plate 400 and in a direction of a thickness of the end plate 400, a shielding structure 410 is connected to an end of the first exhaust hole 4021 far away from the tab holder 300, a second exhaust hole 4022 is formed in one side of the end plate 400 far away from the tab holder 300, the second exhaust hole 4022 is a blind hole, the second exhaust hole 4022 is formed at a side of the first exhaust hole 4021 and is communicated with the first exhaust hole 4021, and the second exhaust hole 4022 and the first exhaust hole 4021 form an exhaust channel 402 together.

Through adopting above-mentioned scheme, the discharge of high-temperature gas is realized to the tortuous exhaust passage 402 that accessible second exhaust hole 4022 and first exhaust hole 4021 formed jointly to can correspondingly reduce high-temperature gas to other electric core subassembly 100's influence, correspondingly prolong the time of remaining electric core subassembly 100 thermal runaway, and still can effectively prevent that relevant personnel's finger from inserting exhaust passage 402 through sheltering from structure 410, thereby do benefit to the security performance that further improves battery module, and can accord with battery module's manufacturing standard basically.

Optionally, in terms of the normal placement state of the battery module, the lower side of the first vent 4021 is communicated with the second vent 4022, so that high-temperature gas can be relatively discharged downwards, and the safety performance of the battery module is further improved.

Referring to fig. 2, 7 and 8, in the present embodiment, the shielding structure 410 is made of plastic.

Through adopting above-mentioned scheme, can be when the temperature through exhaust passage 402 exhaust high-temperature gas is higher, make and shelter from structure 410 and can melt under the high temperature, based on this, can make the sectional area of exhaust passage 402's outlet side enlarge, and can make high-temperature gas directly arrange through exhaust passage 402, thereby can enlarge the displacement in exhaust passage 402's unit interval, can further reduce high-temperature gas to the influence of other electric core subassemblies 100, can further prolong the time of other electric core subassemblies 100 thermal runaway, thereby can further slow down the thermal runaway condition of battery module, do benefit to the security performance that further improves battery module.

Referring to fig. 6, 7 and 8, in the present embodiment, a supporting protrusion 420 is further protruded from a side of the end plate 400 facing the tab holder 300, a third insertion groove 302 is formed on a side of the tab holder 300 facing the end plate 400, and the supporting protrusion 420 is inserted into the third insertion groove 302 and supports the tab holder 300.

The two ends of the end plate 400 in the thickness direction a of the electric core assembly 100 are usually directly abutted to the tab holder 300, and therefore, by adopting the above scheme, the insertion fit between the abutting protrusion 420 and the third insertion groove 302 can be further realized on the basis of ensuring the relative position fixing of the end plate 400 and the tab holder 300, so that the middle area of the end plate 400 in the thickness direction a of the electric core assembly 100 is also abutted to the tab holder 300 through the abutting protrusion 420, and on the basis, the effects of mutual abutting and mutual supporting between the end plate 400 and the tab holder 300 can be further ensured and improved, and the anti-extrusion capability of the battery module can be further improved.

Referring to fig. 2, fig. 6 and fig. 7, in the present embodiment, the supporting protrusion 420 is aligned with the spacing structure 200 located in the middle of the battery module.

It should be noted that the battery module is provided with the spacing structure 200 at least in the middle thereof, i.e., in the middle of the battery module in the thickness direction a of the electric core assembly 100. Therefore, by adopting the above scheme, on one hand, the abutting protrusion 420 can abut to the middle of the battery module, so that the middle anti-extrusion capability of the battery module with the weakest original anti-extrusion capability can be effectively enhanced; on the other hand, the abutting protrusion 420 abuts against the spacing structure 200 instead of the electric core assembly 100, so that when the end plate 400 is extruded, the risk of direct extrusion of the electric core assembly 100 is further reduced, and the service performance and the safety performance of the electric core assembly 100 are further improved.

Referring to fig. 2, 3 and 4, in the present embodiment, the spacing structure 200 located in the middle of the battery module includes a heat-conducting frame 210, and a buffer plate 220 and a heat-insulating plate 230 disposed in the heat-conducting frame 210.

As described above, the battery module is provided with the spacing structure 200 at least in the middle thereof, i.e., in the middle of the battery module in the thickness direction a of the electric core assembly 100. Therefore, by adopting the scheme, the middle spacing structure 200 of the battery module comprehensively has better heat-conducting property, heat-insulating property and buffering property, thereby being beneficial to further ensuring the service performance and safety performance of the battery module.

The heat conducting frame 210 disposed outside the buffer board 220 and the thermal insulation board 230 is directly abutted against the side surface of the electric core assembly 100, so as to preferentially conduct heat on the side surface of the electric core assembly 100 to the bottom, thereby facilitating heat conduction and heat dissipation of the electric core assembly 100. And then the thermal insulation plate 230 and the buffer plate 220 absorb and buffer the expansion and extrusion of the battery module in the thickness direction a of the electric core assembly 100, and the thermal insulation plate 230 separates the heat of the electric core assembly 100 at two sides thereof, so as to prevent the thermal runaway spreading caused by the heat spreading.

Referring to fig. 2, 3 and 4, in the present embodiment, two heat insulation plates 230 are disposed, the two heat insulation plates 230 are respectively disposed on two opposite sides of the buffer plate 220 in the thickness direction, and the heat conduction frame 210 includes two heat conduction vertical plates 211 respectively disposed on one sides of the two heat insulation plates 230 away from the buffer plate 220, and a heat conduction horizontal plate 212 connected to the same side of the two heat conduction vertical plates 211. The shape of the heat conductive frame 210 is U-like.

By adopting the scheme, the two heat-conducting vertical plates 211 directly abutted against the side surfaces of the electric core assembly 100 can directly conduct the heat of the corresponding electric core assembly 100 to the heat-conducting transverse plate 212 so as to facilitate the heat conduction and the heat dissipation of the electric core assembly 100; then, the two heat insulation plates 230 are used for blocking heat of the electric core assemblies 100 at two sides of the spacing structure 200, so as to prevent thermal runaway propagation caused by heat propagation; finally, the expansion and extrusion of the battery module in the thickness direction a of the electric core assembly 100 are absorbed and buffered by the buffer plate 220 arranged between the two heat insulation plates 230; thereby further improving the service performance, the service life and the safety performance of the battery module.

Referring to fig. 1 and 2, in the present embodiment, the end of the thermal insulation board 230 and the end of the thermal conductive vertical board 211 are both protruded from the end of the buffer board 220, and the adjacent thermal insulation board 230 and the thermal conductive vertical board 211 are inserted into and matched with the first insertion groove 301.

By adopting the above scheme, the spacing structure 200 located in the middle of the battery module can be in plugging fit with the first plugging groove 301 through the thermal insulation plate 230 and the heat conduction vertical plate 211 so as to bear most of extrusion force when the tab support 300 is extruded, thereby achieving the effect of slowing down the extrusion degree of the tab support 300 to the electric core assembly 100; and because the buffer plate 220 is not provided with the first inserting groove 301 in an inserting manner, the buffer plate 220 can have a larger deformable amplitude in the thickness direction a of the cell assembly 100, so that the buffer effect of the buffer plate 220 on the expansion and extrusion of the battery module in the thickness direction a of the cell assembly 100 can be further ensured and improved.

Referring to fig. 5, in the present embodiment, at least one end of the first inserting groove 301 is disposed through in the extending direction thereof.

By adopting the above scheme, the operation convenience of the insertion fit of the spacing structure 200 and the first insertion groove 301 can be effectively improved, so that the assembly convenience of the battery module can be correspondingly improved.

Referring to fig. 1, an embodiment of the invention further provides a battery pack including at least one battery module.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents or improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A battery module, comprising:

2. The battery module of claim 1, further comprising at least one end plate disposed on a side of the tab holder facing away from the core assembly, the end plate defining at least one second insertion groove on a side facing the tab holder;

and at least one separation structure used for being in splicing fit with the second splicing groove is convexly arranged on one side of the pole lug support facing the end plate.

3. The battery module as set forth in claim 2, wherein the end plate is further provided with at least one vent passage communicating with the outside at opposite sides of the second insertion groove, respectively.

4. The battery module according to claim 3, wherein the end plate has a first vent hole formed through the end plate in a thickness direction thereof and located beside the second insertion groove, and a shielding structure is connected to an end of the first vent hole away from the tab holder, the end plate further has a second vent hole formed on a side thereof away from the tab holder, the second vent hole is a blind hole, the second vent hole is located beside the first vent hole and is communicated with the first vent hole, and the second vent hole and the first vent hole together form the vent channel.

5. The battery module as claimed in claim 2, wherein the end plate further has a supporting protrusion protruding from a side of the end plate facing the tab holder, the tab holder has a third insertion groove formed on a side of the end plate facing the end plate, and the supporting protrusion is inserted into the third insertion groove and supports the tab holder.

6. The battery module of claim 5, wherein the holding protrusion is aligned with the spacing structure located in the middle of the battery module.

7. The battery module according to claim 1, wherein the spacing structure located at the center of the battery module comprises a heat-conductive frame, and a buffer plate and a heat-insulating plate provided inside the heat-conductive frame.

8. The battery module according to claim 7, wherein two of the heat insulation plates are provided, the two heat insulation plates are respectively provided at opposite sides of the buffer plate in the thickness direction, and the heat conduction frame comprises two heat conduction vertical plates respectively provided at sides of the two heat insulation plates facing away from the buffer plate, and a heat conduction transverse plate connected to the same side of the two heat conduction vertical plates.

9. The battery module according to claim 8, wherein the end of the thermal insulation plate and the end of the thermal conductive riser plate are both protruded from the end of the buffer plate, and the adjacent thermal insulation plate and the thermal conductive riser plate are in inserted fit with the first insertion groove.

10. A battery pack comprising at least one battery module according to any one of claims 1 to 9.