CN216213815U - Lithium ion battery and battery module that scour protection hit - Google Patents

Abstract

The utility model provides a lithium ion battery and battery module of anti-collision, the lithium ion battery includes: the battery comprises a battery shell and a battery core structure, wherein a fixed plate is arranged on the battery core structure, the battery core structure is installed in the battery shell through the fixed plate, arc-shaped buffer plates are respectively arranged on the upper side and the lower side inside the battery shell, and two ends of each arc-shaped buffer plate are respectively connected with the inner surface of the battery shell; the battery module comprises a frame structure and a plurality of lithium ion battery monomers, the frame structure comprises a first side plate, a second side plate and a plurality of isolation layers, the first side plate and the second side plate are symmetrically arranged, the isolation layers are equidistantly arranged between the first side plate and the second side plate, two sides of a fixing plate on each lithium ion battery monomer penetrate through a strip-shaped groove body to enable the lithium ion battery monomers to be arranged in the frame structure, and the lithium ion battery monomers are fixedly connected through holes in the fixing plate by using bolts.

Description

Lithium ion battery and battery module that scour protection hit

Technical Field

The utility model belongs to the technical field of new energy automobiles, and particularly relates to a collision-proof lithium ion battery and a battery module.

Background

Lithium ion battery is comparatively clean and clean for traditional fossil energy, and consequently, lithium ion battery has also met development opportunity unprecedented, but, at present lithium ion battery all can appear explosion and cause such as fire in production and use, and the leading cause lies in production or use in-process lithium ion battery, in case fall or the inside gas emergence of lithium ion battery expands, current lithium ion battery design does not give the expanded space of lithium ion battery to the emergence explosion.

Based on the above, the utility model designs an anti-collision lithium ion battery and a battery module, so as to solve the existing problems.

SUMMERY OF THE UTILITY MODEL

In view of the above, an object of the present invention is to provide a lithium ion battery and a battery module with anti-collision function, so as to solve the problems in the prior art.

To achieve the above object, in a first aspect, an embodiment of the present invention provides an impact-resistant lithium ion battery, including: the battery comprises a battery shell, a cell structure and a fixing groove, wherein arc-shaped buffer plates are respectively arranged on the upper side and the lower side of the interior of the battery shell, each arc-shaped buffer plate comprises an arc-shaped part and flat plates arranged on the two sides of the arc-shaped part, the top end of the arc-shaped part is abutted to the cell structure, and the arc-shaped buffer plates are connected with the inner surface of the battery shell through the flat plates;

the fixed slot includes U type groove and sets up the fixed plate at U type groove both ends will electric core structure sets up U type inslot and through the fixed plate will electric core structure is fixed in the battery casing.

In some possible embodiments, the curved portion and the plates on both sides form a first inflection point and a second inflection point, respectively, a first perpendicular line is drawn through a midpoint of a line between the vertex of the curved portion and the first inflection point, the first perpendicular line intersects with the curved portion to obtain a first intersection point, a second perpendicular line is drawn through a midpoint of a line between the vertex of the curved portion and the second inflection point, and the second perpendicular line intersects with the curved portion to obtain a second intersection point;

the elastic force of the arc-shaped section between the first inflection point and the first intersection point is smaller than that of the arc-shaped section between the first intersection point and the vertex, and the elastic force of the arc-shaped section between the second inflection point and the second intersection point is smaller than that of the arc-shaped section between the second intersection point and the vertex.

In some possible embodiments, the arc-shaped buffer plate is of a spring plate structure, a plurality of circular holes and a plurality of elongated holes are arranged on the arc-shaped buffer plate, the circular holes are distributed in an array on the flat plates on two sides of the arc-shaped buffer plate, and the elongated holes are distributed in an array on the arc-shaped part.

In some possible embodiments, the flat plates on both sides of the arc-shaped buffer plate are connected with the battery shell through welding, screwing or clamping.

In some possible embodiments, a plurality of grooves are uniformly arranged on the outer surface of the battery shell.

In a second aspect, the present invention provides a battery module, including: the lithium ion battery pack comprises a frame structure and a plurality of anti-collision lithium ion batteries arranged in the frame structure, wherein the anti-collision lithium ion batteries are any one of the above lithium ion batteries;

the frame structure includes: the first side plate, the second side plate and a plurality of isolation layers;

the first side plate and the second side plate are symmetrically arranged, the isolation layers are equidistantly arranged between the first side plate and the second side plate, convex structures are respectively arranged on the upper side and the lower side of each isolation layer, the convex structures are matched with grooves in the outer surface of the battery shell, and the anti-collision lithium ion batteries are fixed in the frame structure through the convex structures;

the first curb plate with be provided with a plurality of first bar cell bodies and a plurality of second bar cell body on the second curb plate respectively, every lithium ion battery's fixed plate passes corresponding first bar cell body and second bar cell body and packs into with the lithium ion battery that this scour protection hit the frame structure, wherein, the length of a plurality of first bar cell bodies and a plurality of second bar cell body equals with the length of fixed plate.

In some possible embodiments, the first side plate and the second side plate are respectively provided with a first supporting plate and a second supporting plate, the first supporting plate and the second supporting plate respectively form an L shape with the first side plate and the second side plate, and the plurality of anti-collision lithium ion batteries are supported by the first supporting plate and the second supporting plate.

In some possible embodiments, the plurality of collision-proof lithium ion batteries are fixedly mounted in the frame structure through a fixing plate on the collision-proof lithium ion battery, and the plurality of collision-proof lithium ion batteries are fixedly connected through a through hole on the fixing plate by using a bolt.

In some possible embodiments, the convex structure is a structure having elasticity, and the convex height of the convex structure is greater than the depth of the groove on the battery case;

the convex structure comprises an inner core and a shell, the softness of the shell is greater than that of the inner core, and the hardness of the inner core plays a supporting role in the anti-collision lithium ion battery.

In some possible embodiments, the first side plate and the second side plate have a distance therebetween, such that the bottom of the frame structure is a semi-enclosed structure.

The technical scheme has the following beneficial effects:

according to the anti-collision lithium ion battery and the battery module, the arc buffer plate is arranged in the anti-collision lithium ion battery shell, so that when the peak stress of the arc buffer plate is close to the interior of the battery shell, the buffer force of the arc buffer plate reaches the maximum value, and if the impact force of the battery cell structure is larger, the arc buffer plate from the first inflection point to the first intersection point section and the arc buffer plate from the second inflection point to the second intersection point section start to serve as the buffer column to support the battery cell structure, so that the battery cell can be in soft landing, the battery cell can be protected to the greatest extent, and the lithium ion battery is provided with enough expansion space; meanwhile, according to the battery module provided by the utility model, the plurality of lithium ion batteries are fixed in the frame structure through the frame structure, and the isolation layer and the plurality of convex structures on the isolation layer are arranged on the frame structure.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1A is a front view of an electric lithium ion battery according to an embodiment of the present invention;

fig. 1B is a schematic diagram of a housing structure of an electric lithium ion battery according to an embodiment of the present invention;

fig. 2 is an overall schematic diagram of a cell structure according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of an arc-shaped buffer plate according to an embodiment of the present invention;

FIG. 4 is a side view of an arcuate bumper plate according to an embodiment of the present invention;

fig. 5A is an overall schematic view of a battery module according to an embodiment of the utility model;

fig. 5B is a cross-sectional view of a single lithium ion battery cell according to an embodiment of the utility model;

fig. 6 is a partially enlarged schematic view of a battery module according to an embodiment of the utility model;

fig. 7 is a schematic structural diagram of an isolation layer in a frame structure according to an embodiment of the utility model.

The reference numbers illustrate:

10. the battery comprises a lithium ion battery 1, a battery shell 2, a battery cell structure 12, a groove 11, an arc buffer plate 111, a vertex of the arc buffer plate 11, 112, a first connecting point 113, a second connecting point 114, a first intersection point 115, a second intersection point 116, a flat plate 117, an arc part 118, a circular hole 119, a long-strip-shaped hole 4, a fixing groove 41, a U-shaped groove 42, a fixing plate 43 and a through hole; 30. battery module, 3, frame structure, 31, first curb plate, 32, second curb plate, 312, first backup pad, 322 second backup pad, 33, isolation layer, 331, convex structure, 3111, heart, 3112, shell.

Detailed Description

Features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention. In the drawings and the following description, at least some well-known structures and techniques have not been shown in detail in order to avoid unnecessarily obscuring the present invention; also, the dimensions of some of the structures may be exaggerated for clarity. Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

Example one

As shown in fig. 1A, fig. 1B and fig. 2, an embodiment of the present invention provides an anti-collision lithium ion battery, where a lithium ion battery 10 includes a battery case 1, a cell structure 2 and a fixing groove 4, arc buffer plates 11 are respectively disposed at upper and lower sides inside the battery case 1, each arc buffer plate 11 includes an arc portion 117 and flat plates 116 disposed at two sides of the arc portion, a top end of the arc portion 117 abuts against the cell structure 2, and the arc buffer plates 11 are connected to an inner surface of the battery case 1 through the flat plates 116; the fixing groove 4 includes a U-shaped groove 41 and fixing plates 42 disposed at two ends of the U-shaped groove 41, and the cell structure 2 is disposed in the U-shaped groove 41 and fixed in the battery case 1 by the fixing plates 42.

According to the anti-collision lithium ion battery 10 provided by the utility model, the arc-shaped buffer plate 11 is arranged in the anti-collision lithium ion battery shell 1, so that a space for the anti-collision lithium ion battery 10 to expand sufficiently can be provided, and explosion can be avoided when the anti-collision lithium ion battery 10 falls or the anti-collision lithium ion battery 10 expands due to gas generation.

As shown in fig. 3 and 4, the curved portion 117 and the plates 116 on both sides form a first inflection point 112 and a second inflection point 113, respectively, a first perpendicular line is drawn through a midpoint of a connection line between the vertex 111 of the curved portion 117 and the first inflection point 112, the first perpendicular line intersects with the curved portion 117 to obtain a first intersection point 114, a second perpendicular line is drawn through a midpoint of a connection line between the vertex 111 of the curved portion 117 and the second inflection point 113, and the second perpendicular line intersects with the curved portion 117 to obtain a second intersection point 115;

the elastic force of the arc-shaped segment between the first inflection point 112 and the first intersection point 114 is smaller than the elastic force of the arc-shaped segment between the first intersection point 114 and the vertex 111, the elastic force of the arc-shaped segment between the second inflection point 113 and the second intersection point 115 is smaller than the elastic force of the arc-shaped segment between the second intersection point 115 and the vertex 111, that is, the elastic force of the segment S1 is smaller than the elastic force of the segment S2, and the elastic force of the segment S4 is smaller than the elastic force of the segment S3, so that when the cell structure 2 is pressed against the arc-shaped buffer plate 11 by the acting force generated by expansion, the vertex 111 of the arc-shaped buffer plate 11 is forced to approach toward the inside of the battery case 1, and when the vertex 111 reaches the transverse position of the first intersection point 114, the second intersection point 115 and the vertex 111 are located on the same plane, the buffer force of the arc-shaped buffer plate 11 reaches the maximum value, and when the impact force of the cell structure 2 is greater, the arc-shaped buffer plate 11 and the second intersection point 113 of the arc-shaped segment between the first connection point 112 and the first intersection point 114 are connected to the second intersection point 111 The part of the arc buffer plate 11 with smaller elasticity of the arc-shaped section between the 115 parts begins to serve as a buffer column to support the cell structure 2, so that the cell structure is in soft landing, the cell can be protected to the maximum extent, and the anti-collision lithium ion battery is provided with a space which is expanded enough.

In some embodiments, the arc buffer plate 11 is provided with a plurality of circular holes 118 and a plurality of elongated holes 119, the circular holes 118 are distributed in an array on the flat plates 116 at two sides of the arc buffer plate 11, and the elongated holes 119 are distributed in an array on the arc portion 117, so that the circulation of heat in the housing is facilitated and the heat dissipation performance is improved by providing a plurality of hollow holes. In some embodiments, the flat plates 116 on both sides of the arc buffer plate 11 are connected to the battery case 1 by welding, screwing, or clipping, or other connection methods.

In some embodiments, the arc buffer plate 11 is a spring plate structure or other elastic structure, which is used to increase the elasticity of the buffer plate 11, so as to maximally give the lithium ion battery 10 sufficient expansion space for preventing collision.

In this embodiment, through the inside arc buffer plate 11 that sets up of lithium ion battery casing 1 at the scour protection hits, make the summit atress of arc buffer plate 11 when being close to towards battery casing 1's inside, the buffer power of arc buffer plate 11 reaches the maximum value, and be bigger if electric core structure 2's impulsive force this moment, arc buffer plate 11 and the second tie point 113 of the arc section between first nodical 114 of first tie point 112 to the arc section between second tie point 115 just begin to provide the support as the cushion column to electric core structure 2, make its soft landing, can carry out the maximum protection to electric core, the enough expanded space of lithium ion battery 10 of the scour protection has been given promptly.

Example two

As shown in fig. 5A, 5B and 6, the present invention provides a battery module 30, which includes: a frame structure 3 and a plurality of lithium ion batteries 10, the frame structure 3 comprises a first side plate 31, a second side plate 32 and a plurality of isolation layers 33, the first side plate 31 and the second side plate 32 are symmetrically arranged, the isolation layers 33 are equidistantly arranged between the first side plate 31 and the second side plate 32, the upper side and the lower side of each isolation layer are respectively provided with a convex structure 331, the first side plate 31 and the second side plate 32 are respectively provided with a strip-shaped groove body 311 and a strip-shaped groove body 321, the lithium ion battery 10 for preventing collision is fixed in the frame structure 3 through the strip-shaped groove body 311 and the strip-shaped groove body 321, specifically, the fixing plate 42 is arranged on the fixing groove 4 in the lithium ion battery 10 for preventing collision, two sides of the fixing plate 42 extend to the outer side of the lithium ion battery shell 1, the anti-collision lithium ion battery 10 is fixed in the housing by inserting the extended portions of the two sides of the fixing plate 42 into the bar-shaped groove body 311 and the bar-shaped groove body 321, respectively.

In some embodiments, the first side plate 31 and the second side plate 32 are respectively provided with a first supporting plate 312 and a second supporting plate 322, the first supporting plate 312 and the second supporting plate 322 respectively form an L shape with the first side plate 31 and the second side plate 32, and the plurality of anti-collision lithium ion batteries 10 are supported by the first supporting plate 312 and the second supporting plate 322. By providing the first support plate 312 and the second support plate 322, the stability of the impact-resistant lithium ion battery 10 in the frame structure 3 is improved.

In some embodiments, the fixing plates 42 are further provided with through holes 43, and the plurality of collision-proof lithium ion batteries 10 are fixedly connected together through the through holes 43 by using bolts, that is, the bolts sequentially pass through the through holes 43 on each fixing plate 42 to fixedly connect the plurality of collision-proof lithium ion batteries 10 together, so that the stability of the plurality of single batteries 10 in the battery module 30 is further improved.

In some embodiments, the convex structure 331 is a structure having elasticity, and the convex structure 331 has a protrusion height greater than the depth of the groove 12 on the battery case 1; thus, when the lithium ion battery 10 for collision prevention is placed downwards, since the height of the protrusion of the convex structure 311 is greater than the depth of the groove 12 on the battery shell 1, a certain residual compression space is reserved while a fixed force is applied to the lithium ion battery 10 for collision prevention by the elastic structure, and the range of the height of the protrusion being greater than the depth of the groove is generally 1-2cm, so that the lithium ion battery 10 for collision prevention can be prevented from falling, damaging and exploding to the maximum extent.

In some embodiments, as shown in fig. 7, the male structure 311 includes an inner core 3111 and an outer shell 3112, the outer shell 3112 has a softness greater than that of the inner core 3111, i.e., the inner core is harder than the outer shell, and the inner core 3111 has a hardness sufficient to support the impact resistant lithium ion battery 10.

In some embodiments, a certain distance is provided between the first support plate 311 of the first side plate 31 and the second support plate 322 of the second side plate 32, so that the bottom of the frame structure 3 adopts a semi-enclosed structure, and since the bottom of the frame structure 3 does not adopt a fully enclosed structure, a great heat dissipation effect is also provided for the lithium ion battery 10 preventing impact.

The battery module provided by the utility model can provide enough expansion space for the lithium ion battery 10 when the lithium ion battery 10 falls or the lithium ion battery 10 expands due to gas generation in the production or use process, so that the collision-proof lithium ion battery 10 is prevented from falling, damaging or exploding.

In the description of the present invention, it should be noted that the terms "upper, lower, inner and outer" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms first, second, or third are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The terms "mounted, connected and connected" in the present invention are to be understood broadly, unless otherwise explicitly specified or limited, for example: can be fixedly connected, detachably connected or integrally connected; they may be mechanically, electrically, or directly connected, or indirectly connected through intervening media, or may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

While the utility model has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the utility model. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the utility model not be limited to the particular embodiments disclosed, but that the utility model will include all embodiments falling within the scope of the appended claims.

Claims (10)

1. An impact-resistant lithium-ion battery (10), characterized in that the lithium-ion battery (10) comprises: a battery shell (1), a cell structure (2) and a fixing groove (4),

arc-shaped buffer plates (11) are respectively arranged on the upper side and the lower side of the interior of the battery shell (1), each arc-shaped buffer plate (11) comprises an arc-shaped part (117) and flat plates (116) arranged on the two sides of the arc-shaped part (117), the top end of each arc-shaped part (117) is abutted to the battery cell structure (2), and the arc-shaped buffer plates (11) are connected with the inner surface of the battery shell (1) through the flat plates (116);

the fixing groove (4) comprises a U-shaped groove (41) and fixing plates (42) arranged at two ends of the U-shaped groove (41), and the battery cell structure (2) is arranged in the U-shaped groove (41) and is fixed in the battery shell (1) through the fixing plates (42).

2. An impact-resistant lithium-ion battery (10) according to claim 1, characterized in that: the arc-shaped part (117) and the flat plates (116) on two sides form a first inflection point (112) and a second inflection point (113) respectively, a first vertical line is made through a midpoint of a connecting line between a vertex (111) of the arc-shaped part (117) and the first inflection point (112), the first vertical line is intersected with the arc-shaped part (117) to obtain a first intersection point (114), a second vertical line is made through a midpoint of a connecting line between the vertex (111) of the arc-shaped part (117) and the second inflection point (113), and the second vertical line is intersected with the arc-shaped part (117) to obtain a second intersection point (115);

the elasticity of the arc segment between the first inflection point (112) and the first intersection point (114) is less than the elasticity of the arc segment between the first intersection point (114) and the vertex (111), and the elasticity of the arc segment between the second inflection point (113) and the second intersection point (115) is less than the elasticity of the arc segment between the second intersection point (115) and the vertex (111).

3. The lithium ion battery (10) of claim 2, wherein: arc buffer board (11) are the spring leaf structure arc buffer board (11) are last to be provided with a plurality of circular holes (118) and a plurality of rectangular shape hole (119), a plurality of circular holes (118) distribute array ground on dull and stereotyped (116) of arc buffer board (11) both sides, a plurality of rectangular shape hole (119) distribute array ground on arc part (117).

4. An impact-resistant lithium-ion battery (10) according to any one of claims 1 to 3, characterized in that: the flat plates (116) on the two sides of the arc-shaped buffer plate (11) are connected with the battery shell (1) in a welding, screw connection or clamping manner.

5. An impact-resistant lithium-ion battery (10) according to claim 1, characterized in that: a plurality of grooves (12) are uniformly formed in the outer surface of the battery shell (1).

6. A battery module (30), characterized in that the battery module (30) comprises: a frame structure (3), and a plurality of anti-collision lithium ion batteries (10) according to any one of claims 1 to 5 arranged in the frame structure (3);

the frame structure (3) comprises: a first side plate (31), a second side plate (32) and a plurality of insulating layers (33);

the first side plate (31) and the second side plate (32) are symmetrically arranged, the isolation layers (33) are equidistantly arranged between the first side plate (31) and the second side plate (32), the upper side and the lower side of each isolation layer (33) are respectively provided with a convex structure (331), the convex structures (331) are matched with the grooves (12) on the outer surface of the battery shell (1), and the anti-collision lithium ion batteries (10) are fixed in the frame structure (3) through the convex structures (331);

first curb plate (31) with be provided with a plurality of first bar cell bodies (311) and a plurality of second bar cell body (321) on second curb plate (32) respectively, every fixed plate (42) of lithium ion battery (10) of crashproof pass corresponding first bar cell body (311) and second bar cell body (321) and pack into with lithium ion battery (10) of this scour protection hit framework structure (3), wherein, the length of a plurality of first bar cell bodies (311) and a plurality of second bar cell body (321) equals with the length of fixed plate (42).

7. The battery module according to claim 6, wherein the first side plate (31) and the second side plate (32) are provided with a first support plate (312) and a second support plate (322), respectively, the first support plate (312) and the second support plate (322) respectively constitute an L-shape with the first side plate (31) and the second side plate (32), and the plurality of impact-resistant lithium ion batteries (10) are supported by the first support plate (312) and the second support plate (322).

8. The battery module according to claim 6, wherein the plurality of collision-proof lithium ion batteries (10) are fixedly mounted in the frame structure (3) by means of fixing plates (42) on the collision-proof lithium ion batteries (10), and the plurality of collision-proof lithium ion batteries (10) are fixedly connected by means of bolts through holes (43) in the fixing plates (42).

9. The battery module according to claim 6, wherein the convex structure (331) is a structure having elasticity, and the convex structure (331) has a protrusion height greater than the depth of the groove (12) on the battery case (1);

the convex structure (331) comprises an inner core (3311) and a shell (3312), the softness of the shell (3312) is greater than that of the inner core (3311), and the hardness of the inner core (3311) supports the impact-resistant lithium ion battery (10).

10. The battery module according to claim 6, wherein the first side plate (31) and the second side plate (32) are spaced apart such that the bottom of the frame structure (3) is a semi-enclosed structure.

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