WO2019061830A1

WO2019061830A1 - Battery module

Info

Publication number: WO2019061830A1
Application number: PCT/CN2017/115091
Authority: WO
Inventors: 游志毅; 朱涛声; 秦峰; 马林; 王娟; 肖信福; 李建伟
Original assignee: 宁德时代新能源科技股份有限公司
Priority date: 2017-09-30
Filing date: 2017-12-07
Publication date: 2019-04-04
Also published as: CN207425958U

Abstract

A battery module comprises: a lower casing (10), which is provided with a casing through hole (100) thereon; an upper cover (102) sealed and mounted on the lower casing (10), wherein the upper cover (102) and the lower casing (10) together form a sealed space in which a plurality of batteries is accommodated, and the batteries are provided with a sampling circuit board (20); an external terminal (30) fixedly connected to the outer side of the lower casing (10) and provided with a sampling protection channel (300), the sampling protection channel (300) extending through the casing through hole (100) into the lower casing (10); and a switching circuit board (40), one end of which is located inside the external terminal (30) and the other end of which extends through the sampling protection channel (300) into the lower casing (10), wherein the switching circuit board (40) is electrically connected to the sampling circuit board (20). A sealed connection is formed between the sampling protection channel (300) and the casing through hole (100), and between the switching circuit board (40) and the sampling protection channel (300). The sealed connections between the sampling protection channel (300) and the casing through hole (100) and between the switching circuit board (40) and the sampling protection channel (300) ensure the sealing of the battery module and improve the safety and stability of the battery module.

Description

Battery module

Technical field

The invention belongs to the field of batteries, and more particularly to a battery module.

Background technique

At present, secondary batteries such as lead-acid batteries, nickel-hydrogen batteries, and lithium ion batteries inevitably require a through hole for allowing a low-voltage wire harness to pass through the lower casing of the secondary battery module during low-pressure sampling.

In the development of the integrated battery module, the sealing performance of the battery module has an important influence on the safety and stability of the secondary battery. In the related art, the battery sampling metal wire and the plastic are usually integrally molded, and the combination of the metal wire and the plastic is a physical connection, and the metal and the plastic can be simply injected integrally, so that the sealing cannot be completely completed, and the battery module cannot be guaranteed. The sealing of the group. During the use of the battery module, the outside atmosphere enters the battery module due to poor sealing performance, thereby affecting the safety performance and stability of the battery module.

In view of this, it is indeed necessary to provide a battery module of a sampling system having an ideal sealing performance.

Summary of the invention

The object of the present invention is to overcome the deficiencies of the prior art and to provide a battery module of a sampling system having an ideal sealing performance.

In order to achieve the above object, the present invention provides a battery module including:

a lower housing, the lower housing is provided with a through hole of the housing;

The upper cover is sealed and assembled on the lower casing, and the upper cover and the lower casing together form a sealed space, wherein the sealed space houses a plurality of batteries, and the battery is provided with a sampling circuit board;

The external terminal is fixedly connected to the outside of the lower case, and the external terminal is provided with a sampling protection channel, and the sampling protection is provided. The guard passage extends through the through hole of the housing into the lower housing;

The transit circuit board has one end located in the external terminal and the other end extending through the sampling protection channel into the lower casing and electrically connected to the sampling circuit board;

Wherein, the sampling protection channel is sealedly connected with the through hole of the housing, and the connection between the switching circuit board and the sampling protection channel is sealed.

As an improvement of the battery module of the present invention, the outer circumference of the sampling protection passage is provided with a seal ring, and the seal ring is compressed between the outer terminal and the lower casing.

As an improvement of the battery module of the present invention, the external terminal is provided with a mounting groove on the outer circumference of the sampling protection channel, and the sealing ring is installed in the mounting groove.

As an improvement of the battery module of the present invention, the battery module further comprises a fastening bolt, the lower casing is provided with a fastening through hole, the external terminal is provided with a fastening nut, the sealing ring is provided with an opening, and the fastening bolt is provided The fastening ring is connected to the fastening nut through the fastening through hole and the opening, and the sealing ring is compressed between the external terminal and the lower casing.

As an improvement of the battery module of the present invention, the battery module further includes a gasket disposed in the lower casing and disposed between the lower casing and the fastening bolt.

As an improvement of the battery module of the present invention, a sealant is applied between the transfer circuit board and the sampling protection channel.

As an improvement of the battery module of the present invention, a filling space is provided between the transit circuit board and the sampling protection channel, and the sealing glue is filled in the filling space.

As an improvement of the battery module of the present invention, a sampling circuit board adapter is disposed in the lower casing, and the sampling circuit board is electrically connected to the transit circuit board through the sampling circuit board adapter.

As an improvement of the battery module of the present invention, the external terminal includes a sampling joint and a metal wire, one end of the metal wire is connected to the sampling joint, and the other end is electrically connected to the transfer circuit board.

As an improvement of the battery module of the present invention, the sampling circuit board is a flexible circuit board, and the transit circuit board is a PCB board.

Compared with the prior art, in the battery module of the present invention, the transfer circuit board and the sampling protection channel are coated. The sealing sealant is sealed and sealed between the sampling protection passage and the through hole of the casing through the sealing ring. The sealing between the external terminal and the lower casing is realized by the joint action of the two sealing connections, thereby ensuring the sealing of the battery module. Improves the safety performance and stability of the battery module.

DRAWINGS

The battery module of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments, wherein:

FIG. 1 is a schematic structural view of a battery module of the present invention.

FIG. 2 is an enlarged, exploded, isometric view of the circled portion A of FIG. 1. FIG.

FIG. 3 is an exploded perspective view of the battery module sampling system of the present invention.

4 is an exploded perspective view of the external terminal in the battery module shown in FIG. 3.

FIG. 5 is a schematic diagram showing the connection of an external terminal and a transit circuit board in the battery module shown in FIG. 3. FIG.

Among them, the reference numerals are as follows:

10-lower housing 100-housing through hole 102-top cover

104-fastening through hole 20-sampling circuit board 30-external terminal

300-sampling protection channel 302-terminal housing 304-terminal housing cover

306-Assembly slot 308-Metal wire 310-Sampling connector

3000-filled space 40-adaptor circuit board 50-seal

500-opening 60-shims 600-opening

70-tightening bolt 80-sampling board adapter

Detailed ways

The present invention will be further described in detail below in conjunction with the drawings and specific embodiments. The specific embodiments described in the specification are to be construed as illustrative only and not limiting.

Referring to FIG. 1 to FIG. 5, the battery module of the present invention comprises:

a lower housing 10, the lower housing 10 is provided with a housing through hole 100;

The upper cover 102 is sealed and assembled on the lower casing 10. The upper cover 102 and the lower casing 10 together form a sealed space. The sealed space houses a plurality of batteries (not shown), and the battery is provided with a sampling circuit board 20;

The external terminal 30 is fixedly connected to the outside of the lower casing 10, and the external terminal 30 is provided with a sampling protection channel 300 through which the sampling protection channel 300 extends into the lower casing 10;

The switching circuit board 40 has one end located in the external terminal 30 and the other end extending through the sampling protection channel 300 into the lower casing 10 and electrically connected to the sampling circuit board 20;

The sampling protection channel 300 is sealedly connected to the housing through hole 100, and the switching circuit board 40 and the sampling protection channel 300 are sealed.

According to an embodiment of the battery module of the present invention, the sampling circuit board 20 is a flexible circuit board, and the switching circuit board 40 is a PCB board.

The battery module includes a lower casing 10, an upper cover 102, and a plurality of batteries housed in the lower casing 10. The upper cover 102 and the lower casing 10 together form a sealed space, and the side wall of one end of the lower casing 10 is opened. Housing through hole 100. A fastening through hole 104 is defined in the lower housing 10, and the fastening through hole 104 is located at two sides of the housing through hole 100. As an embodiment of the present invention, the housing through hole 100 is consistent with the height of the battery top in the battery module.

The external terminal 30 includes a terminal housing 302 and a terminal cover 304 that is closed to the terminal housing 302. The terminal housing 302 is provided with a sampling protection channel 300, and the sampling protection channel 300 extends through the housing through hole 100 to the lower housing. Within 10.

As an embodiment of the present invention, the sampling protection channel 300 has a square structure, and the sampling protection channel 300 is provided with an elongated channel extending through the interior thereof, and the transit circuit board 40 is inserted into the length of the sampling protection channel 300 from the inside of the external terminal 30. The strip-shaped channel, the elongated channel, can support and guide the transmission circuit board 40 passing through the sampling protection channel 300. A filling space 3000 is defined in one end of the sampling protection channel 300. In the illustrated embodiment, the filling space 3000 is a receiving groove recessed in one end of the sampling protection channel 300.

The external terminal 30 includes the transfer circuit board 40, the sampling joint 310, and the gold drawn from the self-sampling joint 310. The wire 308, the sampling connector 310 sends the sampling signal of the external terminal 30 to the external detection control system; the metal wire 308 is electrically connected to the adapter circuit board 40, and is soldered to the switching circuit in a manner parallel to the terminal housing 302. The board 40 is located within the external terminal 30 and extends through the sample protection channel 300 into the lower housing 10.

In order to realize the sealed connection between the transfer circuit board 40 and the sampling protection channel 300, the glue seal is filled in the filling space 3000, and the glue is fixed and fully filled between the transfer circuit board 40 and the sampling protection channel 300. The tightness of the junction of the transfer circuit board 40 and the sampling protection channel 300 is ensured. In the illustrated embodiment, the transit circuit board 40 is a PCB board.

The external terminal 30 is provided with a mounting groove 306 at the periphery of the sampling protection channel 300. The inner and outer sides of the housing through hole 100 of the lower casing 10 are respectively provided with a sealing ring 50 and a gasket 60, wherein the sealing ring 50 is an intermediate portion. An elongated rubber ring having an opening 500 is provided. The sealing ring 50 is sleeved on the sampling protection channel 300 through the opening 500 and installed in the mounting groove 306, so that the sealing ring 50 is located in the lower housing 10 and the external terminal 30. The gasket 60 is an elongated plastic gasket having an opening 600 in the middle thereof, and the opening 600 is located at a position corresponding to the casing through hole 100. The gasket 60 is mounted from the inner side of the lower casing 10 to the casing through hole 100. In the peripheral position. As an embodiment of the present invention, the sealing ring 50, the spacer 60, and the external terminal 30 are respectively provided with openings corresponding to the fastening through holes 104 of the lower casing 10.

A fastening bolt 70 and a fastening nut (not shown) are respectively disposed in the lower casing 10 and the external terminal 30, and the fastening bolt 70 sequentially passes through the opening in the gasket 60 and the fastening of the lower casing 10 After the hole 104 and the opening of the sealing ring 50 and the external terminal 30 are screwed with the fastening nut, the sealing ring 50 is compressed between the external terminal 30 and the housing through hole 100 of the lower casing 10, through A seal between the external terminal 30 and the housing through hole 100 can be achieved by applying a certain clamping force to the seal ring 50. The fastening bolt 70 is fixedly coupled to the periphery of the housing through hole 100 by passing through an opening in the spacer 60, and the connection strength at the housing through hole 100 can be ensured.

A sampling circuit board adapter 80 is disposed in the lower casing 10, and the sampling circuit board 20 and the switching circuit board 40 are electrically connected to the two ends of the sampling circuit board adapter 80, respectively, to implement the sampling circuit board 20 and the switching circuit. Board Electrical connection between 40. The sampling circuit board adapter 80 includes a male and a female, wherein the female of the sampling circuit board adapter 80 is soldered to the switching circuit board 40, and the male of the sampling circuit board adapter 80 is mounted on the sampling circuit board. 20 on.

When installing, first, the transit circuit board 40 located in the external terminal 30 passes through the sampling protection channel 300, and is filled in the filling space 3000 by sealing the glue, and the adapter circuit board 40 and the sampling protection channel 300 are realized after curing. Sealed connection between;

Next, the sealing ring 50 is placed in the mounting groove 306 of the external terminal 30, and the sampling protection channel 300 of the external terminal 30 is passed through the housing through hole 100 to the inside of the lower housing 10;

Again, the fastening bolt 70 in the lower casing 10 is sequentially passed through the reinforcing gasket 60, the fastening through hole 102 of the lower casing 10, the seal ring 50 and the external terminal 30, and the fastening nut in the external terminal 30. Threaded connection, compressing the sealing ring 50 between the sampling protection channel 300 and the housing through hole 100;

Finally, the electrical connection between the sampling circuit board 20 and the transit circuit board 40 is achieved by the sampling circuit board adapter 80 inside the lower housing 10.

As can be seen from the above detailed description of the embodiments of the present invention, the adapter circuit board 40 and the sampling protection channel 300 in the battery module of the present invention are connected by a glue seal, and the sampling protection channel 300 and the shell are compared with the prior art. The body through holes 100 are sealed and connected by the sealing ring 50. Through the joint action of the two sealing connecting passages, the fastening between the external terminal 30 and the lower casing 10 is achieved, thereby ensuring the sealing performance of the battery module and improving The safety performance and stability of the battery module.

The above embodiments may be modified and modified as appropriate by those skilled in the art in light of the above disclosure. Therefore, the invention is not limited to the specific embodiments disclosed and described herein, and the modifications and variations of the invention are intended to fall within the scope of the appended claims. In addition, although specific terms are used in the specification, these terms are merely for convenience of description and do not limit the invention.

Claims

A battery module, comprising:

a lower housing, the lower housing is provided with a through hole of the housing;

The upper cover is sealed and assembled on the lower casing, and the upper cover and the lower casing together form a sealed space, wherein the sealed space houses a plurality of batteries, and the battery is provided with a sampling circuit board;

The external terminal is fixedly connected to the outer side of the lower casing, the external terminal is provided with a sampling protection channel, and the sampling protection channel extends through the through hole of the casing into the lower casing;

The transit circuit board has one end located in the external terminal and the other end extending through the sampling protection channel into the lower casing and electrically connected to the sampling circuit board;

Wherein, the sampling protection channel is sealedly connected with the through hole of the housing, and the connection between the switching circuit board and the sampling protection channel is sealed.
The battery module according to claim 1, wherein the outer circumference of the sampling protection passage is provided with a seal ring, and the seal ring is compressed between the outer terminal and the lower casing.
The battery module according to claim 2, wherein the external terminal is provided with a mounting groove on the outer circumference of the sampling protection passage, and the sealing ring is installed in the fitting groove.
The battery module according to claim 2, further comprising a fastening bolt, the lower casing is provided with a fastening through hole, the external terminal is provided with a fastening nut, and the sealing ring is provided with an opening and fastening The bolt is connected to the fastening nut through the fastening through hole and the opening, and the sealing ring is compressed between the external terminal and the lower casing.
The battery module according to claim 4, further comprising a gasket, the gasket being located in the lower casing and disposed between the lower casing and the fastening bolt.
The battery module according to claim 1, wherein a sealant is applied between the transfer circuit board and the sampling protection channel.
The battery module according to claim 6, wherein a filling space is provided between the transit circuit board and the sampling protection channel, and the sealing glue is filled in the filling space.
The battery module according to claim 1, wherein a sampling circuit board adapter is disposed in the lower casing, and the sampling circuit board is electrically connected to the transit circuit board through the sampling circuit board adapter.
The battery module according to claim 1, wherein the external terminal comprises a sampling joint and a metal wire, one end of the metal wire is connected to the sampling joint, and the other end is electrically connected to the transit circuit board.
The battery module according to claim 1, wherein the sampling circuit board is a flexible circuit board, and the switching circuit board is a PCB board.