CN220692175U

CN220692175U - Lithium battery module

Info

Publication number: CN220692175U
Application number: CN202321970492.8U
Authority: CN
Inventors: 张高林; 简小军; 冯志刚
Original assignee: Sichuan Nengchuangzhi Electric Technology Co ltd
Current assignee: Sichuan Nengchuangzhi Electric Technology Co ltd
Priority date: 2023-07-25
Filing date: 2023-07-25
Publication date: 2024-03-29
Anticipated expiration: 2033-07-25

Abstract

The utility model discloses a lithium battery module, which comprises a battery cell assembly, a first sealing strip, a second sealing strip and a third sealing strip, wherein the battery cell assembly consists of a plurality of battery cells and a shell wrapped outside the battery cells, the end head of the battery cell assembly is electrically connected with a BMS circuit board through a plurality of sampling wires, the shell comprises an upper cover positioned above the battery cells, the battery cells are arranged at intervals in the battery cell assembly through a partition plate, the first sealing strip is respectively arranged at two sides of the upper cover and extends along the length direction of the upper cover, and the second sealing strip and the third sealing strip are tightly pressed between the upper cover and the partition plate; the second sealing strip and the third sealing strip are respectively abutted with the upper portion and the lower portion of the sampling wire rod to form sealing fit, and the second sealing strip and the third sealing strip are located at the edge of the upper cover, which is close to the BMS circuit board, and extend along the width direction of the upper cover. According to the utility model, the positions of the battery core assembly, through which electrolyte is splashed when the battery core assembly is out of control, can be sealed, so that short circuit or faults caused by contact of the electrolyte and a BMS circuit board are effectively prevented, and the safety of the lithium battery module is further improved.

Description

Lithium battery module

Technical Field

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

Background

The lithium battery module probably takes place thermal runaway when using, and thermal runaway leads to the electrolyte blowout of electric core to pollute BMS circuit board, arouses the short circuit or the trouble of BMS circuit board, and the short circuit or the trouble of finally probably leading to the explosion of firing because of the BMS circuit board exists the potential safety hazard. The lithium battery module adopts the casing to protect the electric core, and realizes the electrical connection of electric core subassembly and BMS circuit board through sampling wire rod, consequently must leave sufficient space in the line department of crossing of sampling wire rod for sampling wire rod to pass through, and sampling wire rod generally passes through from the upper portion of electric core subassembly, then when electric core takes place thermal runaway, and electrolyte flows to BMS circuit board department through these clearances very easily.

Disclosure of Invention

The technical problems to be solved by the utility model are as follows: the lithium battery module is good in sealing performance and high in safety.

The technical scheme adopted by the utility model for solving the technical problems is as follows: the lithium battery module comprises a battery core assembly, a first sealing strip, a second sealing strip and a third sealing strip, wherein the battery core assembly consists of a plurality of battery cores and a shell wrapped outside the battery cores, the end head of the battery core assembly is electrically connected with a BMS circuit board through a plurality of sampling wires, the shell comprises an upper cover positioned above the battery cores, the battery cores are arranged at intervals in the battery core assembly through a partition plate, the first sealing strip is respectively arranged at two sides of the upper cover and extends along the length direction of the upper cover, and the second sealing strip and the third sealing strip are tightly pressed between the upper cover and the partition plate; the second sealing strip and the third sealing strip are respectively abutted with the upper portion and the lower portion of the sampling wire rod to form sealing fit, and the second sealing strip and the third sealing strip are located at the edge of the upper cover, which is close to the BMS circuit board, and extend along the width direction of the upper cover. According to the utility model, according to the injection direction of electrolyte in thermal runaway of the battery cell assembly, a plurality of sealing strips are arranged in the lithium battery module to seal a gap through which the electrolyte is easy to pass in thermal runaway of the battery cell assembly, and because a sampling wire rod in the lithium battery module is routed from the upper part of the battery cell assembly and a gap for routing the sampling wire rod is reserved between an upper cover and a partition plate, the second sealing strip and a third sealing strip are arranged at the position in a targeted manner, the second sealing strip and the second sealing strip are respectively pressed above and below the sampling wire rod by the pressing force of the upper cover assembly, and meanwhile, the first sealing strips are arranged at the two side edges of the upper cover to seal the position through which the electrolyte is likely to splash in thermal runaway of the battery cell assembly, so that the utility model can seal the position through which the electrolyte is likely to splash in thermal runaway of the battery cell assembly is contacted with a BMS circuit board, thereby effectively preventing short circuit or faults caused by contact of the electrolyte and improving the safety of the lithium battery module.

As an improvement of the scheme, the following steps are: the cross section shape of the first sealing strip is a D shape with a big top and a small bottom, the big end face of the first sealing strip is a plane, the small end face of the first sealing strip is an arc face, and the big end face of the first sealing strip is abutted against the inner top face of the upper cover. According to the utility model, the structure of the first sealing strip is optimized, so that the cross section shape of the first sealing strip is more adaptive to the spatial distribution of the sealing position, the large end plane of the first sealing strip can be tightly attached to the inner top surface of the upper cover, and the small end cambered surface of the first sealing strip can be embedded into a smaller space below, so that the sealing effect at the side edge of the upper cover is improved.

As an improvement of the scheme, the following steps are: the first sealing strip is of a hollow structure with deformation gaps, and the deformation gaps are of a channel structure penetrating to two ends of the first sealing strip along the length direction of the first sealing strip. According to the utility model, the structure of the first sealing strip is further improved, the channel structure is added on the first sealing strip to serve as a deformation gap, so that the first sealing strip can be deformed in a larger amplitude after being pressed, the first sealing strip can be contracted and deformed by extrusion during sealing, the first sealing strip can be clamped at the assembly space by the rebound force after being deformed after the cambered surface of the small end of the first sealing strip is embedded into the assembly space, and the sealing effect of the first sealing strip can be further improved.

As an improvement of the scheme, the following steps are: and the two end heads of the second sealing strip and the third sealing strip are respectively abutted against the side surfaces of the two first sealing strips positioned on the two sides of the upper cover. According to the utility model, the two end heads of the second sealing strip and the third sealing strip are abutted against the side surfaces of the two first sealing strips so as to fill the gap between the sealing strips, thereby improving the sealing effect.

As an improvement of the scheme, the following steps are: the bottom surface of the second sealing strip and the top surface of the third sealing strip are provided with waterproof structures which are meshed and matched with the sampling wires; the waterproof structure consists of a plurality of arc tooth shapes which are distributed at intervals, and the tops of the arc tooth shapes are embedded into concave gaps between adjacent sampling wires; the bottom surface of the third sealing strip is a plane which is abutted against the top of the partition plate. According to the utility model, the waterproof structures are added on the second sealing strip and the third sealing strip to improve the waterproof effect on electrolyte, the arc tooth shapes adopted by the waterproof structures can be in different arrangement forms, the arc tooth shapes are distributed along the length direction of the sealing strip to form a multi-layer blocking waterproof structure, and the arc tooth shapes are distributed along the width direction of the sealing strip to enable the arc tooth shapes to be embedded into the concave gaps of the sampling wires to form meshing fit, so that the space easy to leave the gaps is effectively sealed.

As an improvement of the scheme, the following steps are: the first sealing strip, the second sealing strip and the third sealing strip can all adopt rubber sealing strips. According to the utility model, the sealing strip is prepared by adopting the rubber material with better elasticity, so that better sealing effect can be improved by the elasticity of the rubber material.

The beneficial effects of the utility model are as follows: according to the utility model, according to the injection direction of electrolyte in thermal runaway of the battery cell assembly, a plurality of sealing strips are arranged in the lithium battery module to seal a gap through which the electrolyte is easy to pass in thermal runaway of the battery cell assembly, and because a sampling wire rod in the lithium battery module is routed from the upper part of the battery cell assembly and a gap for routing the sampling wire rod is reserved between an upper cover and a partition plate, the second sealing strip and a third sealing strip are arranged at the position in a targeted manner, the second sealing strip and the second sealing strip are respectively pressed above and below the sampling wire rod by the pressing force of the upper cover assembly, and meanwhile, the first sealing strips are arranged at the two side edges of the upper cover to seal the position through which the electrolyte is likely to splash in thermal runaway of the battery cell assembly, so that the utility model can seal the position through which the electrolyte is likely to splash in thermal runaway of the battery cell assembly is contacted with a BMS circuit board, thereby effectively preventing short circuit or faults caused by contact of the electrolyte and improving the safety of the lithium battery module.

Drawings

FIG. 1 is an exploded view of the structure of the present utility model;

FIG. 2 is a cross-sectional view of the present utility model;

FIG. 3 is a schematic view of a second seal strip according to the present utility model;

fig. 4 is a schematic structural view of a third sealing strip according to the present utility model.

Marked in the figure as: 100-cell assembly, 110-upper cover, 120-baffle, 200-BMS circuit board, 300-sampling wire rod, 400-first sealing strip, 410-deformation clearance, 500-second sealing strip, 510-waterproof structure, 600-third sealing strip.

Detailed Description

In order to facilitate an understanding of the utility model, the utility model is further described below with reference to the accompanying drawings.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "front", "rear", "left", "right", "upper", "lower", "inner", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of description, and do not indicate or imply that the apparatus or components referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

As shown in fig. 1 and 2, the disclosed lithium battery module adds a plurality of sealing strips on the basis of the battery cell assembly 100, the BMS circuit board 200 and the sampling wires 300, wherein the sealing strips comprise a first sealing strip 400 for sealing two side edge parts of the upper cover 110 in the shell, a second sealing strip 500 for sealing the wiring part of the sampling wires 300 and a third sealing strip 600. The battery cell assembly 100 consists of a shell and a plurality of battery cells arranged in the shell, wherein the shell is used as a protection component of the battery cells and is of a hollow cavity structure formed by assembling an upper cover 110 and other shell components in a detachable connection mode, the battery cells are arranged in the shell and are arranged at intervals under the separation effect of a partition board 120, and the upper cover 110 is positioned at the upper part of the battery cell assembly 100; the battery cell assembly 100 is electrically connected to the BMS circuit board 200 through the sampling wire 300, and the BMS circuit board 200 is mounted at the end of the battery cell assembly 100, and the sampling wire 300 is generally routed from the upper portion of the battery cell assembly 100, i.e., from the space between the front end of the upper cover 110 and the end of the battery cell assembly 100. If the battery cell assembly 100 is out of control, electrolyte sprayed by the battery cell may flow from a position with a gap to the BMS circuit board 200, and in the lithium battery module, the upper cover 110 is connected with other parts of the housing in a snap connection manner, and the front end of the upper cover 110 needs to form a wiring space of the sampling wire 300 with the end of the battery cell assembly 100, so that two side edges of the upper cover 110 and the front end of the upper cover 110 are the positions where electrolyte is most likely to leak. In the present utility model, the first sealing strip 400, the second sealing strip 500 and the third sealing strip 600 are made of elastic materials, such as rubber, sponge, resin, etc., and in view of the strength problem, EPDM rubber sealing strips having both good elasticity and strength are preferable.

Specifically, as shown in fig. 1 and 2, the present utility model provides the first sealing strip 400 at both side edges of the upper cover 110, and the second sealing strip 500 and the third sealing strip 600 at the routing space of the sampling wire 300; the two first sealing strips 400 are respectively arranged at the two side edges of the upper cover 110 along the length direction of the upper cover 110, the second sealing strip 500 and the third sealing strip 600 are positioned at the side part of the upper cover 110, which is close to the BMS circuit board 200, and extend along the width direction of the upper cover 110, the second sealing strip 500 and the third sealing strip 600 are respectively abutted against the upper and lower parts of the sampling wires 300, the second sealing strip 500 and the third sealing strip 600 are tightly pressed between the upper cover 110 and the partition plate 120 by the fastening force of the upper cover 110 after being assembled, and the original partition plate 120 of the battery cell assembly 100 is used as the installation basis of the second sealing strip 500 and the third sealing strip 600 to provide stable supporting force for the second sealing strip 500 and the third sealing strip 600; the both end heads of the second weather strip 500 and the third weather strip 600 are respectively abutted against the side surfaces of the two first weather strips 400 located on both sides of the upper cover 110. According to the utility model, the sealing strip is adopted to seal the parts, so that the possibility that electrolyte flows to the BMS circuit board 200 when the battery cell assembly 100 is out of control is reduced to the minimum, the wind direction of short circuit or fault of the BMS circuit board 200 caused by contact with the electrolyte is reduced, further, the subsequent possible ignition and explosion can be effectively prevented, and the safety of the lithium battery module is effectively improved.

Further, according to the utility model, the structure of the first sealing strip 400 is improved, as shown in fig. 1, the cross section of the first sealing strip 400 is formed into a D shape with a large plane end face and a small cambered surface end face, the large end plane of the first sealing strip 400 is abutted against the inner top face of the upper cover 110, so that no gap exists between the first sealing strip 400 and the upper cover 110 in a tight abutting manner, and the lower end of the first sealing strip 400 is provided with the cambered surface with a smaller size, so that the lower end of the first sealing strip 400 is facilitated to be embedded into the assembly gap, and a better sealing effect can be achieved. In order to improve the fitting effect between the lower end of the first sealing strip 400 and the assembly space, the structure of the first sealing strip 400 is further optimized, as shown in fig. 1, a channel structure penetrating to two ends of the first sealing strip 400 along the length direction of the first sealing strip 400 is added to the first sealing strip 400, so that the first sealing strip 400 forms a hollow structure with deformation gaps 410. After the deformation gap 410 is set, when the lower part of the first sealing strip 400 is pressed to enable the lower part of the first sealing strip 400 to be embedded into the assembly space, the first sealing strip 400 is subjected to shrinkage deformation due to the fact that the extrusion force of the first sealing strip 400 is increased along with the penetration of the first sealing strip 400, and after the first sealing strip 400 is assembled in place, the first sealing strip 400 is clamped at the assembly space by the rebound force after deformation, so that the sealing effect of the first sealing strip 400 can be further improved.

Further, the present utility model improves the structures of the second sealing strip 500 and the third sealing strip 600, as shown in fig. 1 to 4, waterproof structures 510 are disposed on both the second sealing strip 500 and the third sealing strip 600, and the waterproof structures 510 are formed by a plurality of circular arc tooth shapes arranged at intervals. Specifically, the circular arc tooth shape of the waterproof structure 510 may adopt different arrangement modes; the circular arc tooth shapes of the waterproof structure 510 can be transversely arranged, namely, the circular arc tooth shapes are distributed along the length direction of the sealing strip, so that a plurality of circular arc tooth shapes of the waterproof structure 510 can form a multi-layer blocking structure on the flowing path of electrolyte, and good waterproof effect is achieved through layer-by-layer sealing; the circular arc tooth shapes of the waterproof structure 510 can also be longitudinally arranged, namely, arranged along the width direction of the sealing strip, so that an undulating structure meshed with the sampling wires 300 is formed, and the circular arc tooth shapes of the waterproof structure 510 can be embedded into concave gaps between the sampling wires 300 to achieve the effect of filling and sealing. Since the third sealing strip 600 is pressed against the top of the separator 120, it is preferable that the bottom of the third sealing strip 600 is provided in a flat surface so that it can form a tight fitting effect with the top surface of the separator 120 without a gap.

Claims

1. Lithium cell module, including by a plurality of electric cores and parcel at electric core subassembly (100) that the outside casing of electric core is constituteed, the end of electric core subassembly (100) is through many sampling wire rods (300) and BMS circuit board (200) electrical connection, and the shell is including upper cover (110) that are located electric core top, and electric core subassembly (100) are inside to make electric core interval arrangement through setting up baffle (120), its characterized in that: the sealing device further comprises first sealing strips (400) which are respectively arranged at two sides of the upper cover (110) and extend along the length direction of the upper cover (110), and second sealing strips (500) and third sealing strips (600) which are tightly pressed between the upper cover (110) and the partition plate (120); the second sealing strip (500) and the third sealing strip (600) are respectively abutted against the upper portion and the lower portion of the sampling wire rod (300) to form sealing fit, and the second sealing strip (500) and the third sealing strip (600) are located at the edge portion, close to the BMS circuit board (200), of the upper cover (110) and extend along the width direction of the upper cover (110).

2. The lithium battery module of claim 1, wherein: the cross section shape of the first sealing strip (400) is a D shape with a large upper part and a small lower part, the large end face of the first sealing strip (400) is a plane, the small end face of the first sealing strip (400) is an arc face, and the large end plane of the first sealing strip (400) is abutted against the inner top face of the upper cover (110).

3. The lithium battery module of claim 2, wherein: the first sealing strip (400) is of a hollow structure provided with a deformation gap (410), and the deformation gap (410) is of a channel structure penetrating to two ends of the first sealing strip (400) along the length direction of the first sealing strip (400).

4. The lithium battery module of claim 2, wherein: the two end heads of the second sealing strip (500) and the third sealing strip (600) are respectively abutted against the side surfaces of the two first sealing strips (400) positioned on the two sides of the upper cover (110).

5. The lithium battery module of claim 1, wherein: the bottom surface of the second sealing strip (500) and the top surface of the third sealing strip (600) are provided with waterproof structures (510) which are in meshed fit with the sampling wires (300); the waterproof structure (510) is composed of a plurality of arc tooth shapes which are distributed at intervals, and the tops of the arc tooth shapes are embedded into concave gaps between adjacent sampling wires (300); the bottom surface of the third sealing strip (600) is a plane which is abutted against the top of the partition board (120).