阅读说明：本技术 用以提高安全性的电池模块 (Battery module for improving safety ) 是由 侯金定 吴道成 于 2019-09-10 设计创作，主要内容包括：本发明提供一种用以提高安全性的电池模块,包括至少一固定架、多个电池芯、多个导电片及多个保护单元,其中电池芯设置于固定架上。各个导电片分别串联两个电池芯,而各个保护单元则分别连接两个导电片,使得导电片连接的电池芯通过保护单元并联。当保护单元的温度大于一预设温度,或者是通过保护单元的电流大于一预设电流时,保护单元将会熔断,藉此以防止并联的电池芯对故障的电池芯不正常充电,而导致故障的电池芯烧熔或爆炸的情形发生,并有利于提高电池模块的安全性。(The invention provides a battery module for improving safety, which comprises at least one fixing frame, a plurality of battery cores, a plurality of conducting strips and a plurality of protection units, wherein the battery cores are arranged on the fixing frame. Each conducting plate is respectively connected with two battery cores in series, and each protection unit is respectively connected with two conducting plates, so that the battery cores connected with the conducting plates are connected in parallel through the protection units. When the temperature of the protection unit is higher than a preset temperature or the current passing through the protection unit is higher than a preset current, the protection unit will be fused, so that the situation that the failed battery core is fused or exploded due to abnormal charging of the parallel battery cores is prevented, and the safety of the battery module is improved.)

1. A battery module for improving safety, comprising:

at least one fixed frame;

a plurality of battery cores arranged on the fixing frame;

a plurality of conducting strips which are respectively connected with two battery cores in series; and

and the at least one protection unit is connected with the two conducting sheets, so that the battery cores connected with the conducting sheets are connected in parallel, and when the temperature of the protection unit is higher than a preset temperature or the current passing through the protection unit is higher than a preset current, the protection unit is disconnected.

2. The battery module as set forth in claim 1, wherein the protection unit is a thermal fuse, a current fuse, a solder wire, a single core copper wire, a self-healing fuse, or a resistor.

3. The battery module as claimed in claim 1, wherein the plurality of battery cells are arranged in a matrix along a first direction and a second direction, the first direction is perpendicular to the second direction, the arrangement directions of the battery cells adjacent to each other in the first direction are opposite, and the arrangement directions of the battery cells adjacent to each other in the second direction are the same.

4. The battery module as set forth in claim 1, wherein the conductive sheets are connected in series to the battery cells to form a series battery core pack, and the protective unit connects the battery cells of two of the series battery core packs in parallel.

5. The battery module as claimed in claim 1, wherein one surface of the holder comprises a plurality of battery cell recesses for receiving and fixing the battery cells, and the other surface of the holder comprises a plurality of conductive plate recesses for receiving the conductive plates, and the battery cell recesses are connected to the conductive frame recesses.

6. The battery module as set forth in claim 5, wherein the number of the holders is two, and the holders are disposed at both ends of the battery cell, respectively.

7. The battery module as claimed in claim 1, comprising a first conductive sheet and a second conductive sheet, wherein the first conductive sheet and the second conductive sheet are respectively connected in parallel to a portion of the battery cell and serve as an output terminal or an input terminal of the battery module for improving safety.

8. The battery module as claimed in claim 1, comprising a plurality of first conductive sheets and a plurality of second conductive sheets, each of the first conductive sheets and each of the second conductive sheets being connected to one of the battery cells, wherein two of the first conductive sheets are connected through the protection unit, and two of the second conductive sheets are connected through the protection unit.

9. The battery module as claimed in claim 1, wherein the conductive sheets are connected in series with the battery cells, and the protection units are connected in parallel with the battery cells.

Technical Field

The present invention provides a battery module for improving safety, which can prevent a failed battery cell from being abnormally charged by parallel-connected battery cells, thereby causing a situation of fusing or explosion of the failed battery cell, and is advantageous for improving safety of the battery module.

Background

Rechargeable batteries are widely used in many products, such as notebook computers, tablet computers, mobile communication devices, electric bicycles, electric locomotives, or electric vehicles. A plurality of battery cells (cells) are generally connected to form a battery pack, and the series connection and/or the parallel connection of the respective battery cells are adjusted so that the battery pack can output a voltage required by a product.

Generally, a plurality of battery cells are mounted on a fixing frame, and the battery cells are connected in series and in parallel through conductive sheets to form a battery pack, and the battery pack is mounted on a product.

In practical application, if one of the battery cells in the battery pack fails to cause a short circuit, the other normal battery cells will be charged with a large current, and the temperature of the short-circuited battery cell will rise abnormally. When the temperature exceeds the temperature that the isolating layer in the battery core can bear, the isolating layer is dissolved, so that the anode and cathode materials of the battery core are in short circuit, and the condition of fusing or explosion of the battery core is further caused.

Disclosure of Invention

An objective of the present invention is to provide a battery module for improving safety, which includes a plurality of battery cells, a plurality of conductive sheets and a plurality of protection units, wherein the conductive sheets are used for connecting the battery cells in series, and the protection units are used for connecting the battery cells in parallel. When the temperature of the protection unit is too high and/or the current is too large, the protection unit is burnt and melted, and the failed battery cell and the normal battery cell connected in parallel are disconnected, so that the failed battery cell is prevented from being burnt and melted or exploding.

One objective of the present invention is to provide a battery module for improving safety, which includes a plurality of battery cells, at least one fixing frame, a plurality of conductive sheets, and a plurality of protection units, wherein the battery cells are disposed on the fixing frame and can be arranged in a matrix manner. The battery cells adjacent in the first direction are arranged in such a manner that the positive and negative poles are opposite, and the battery cells in the second direction are arranged in such a manner that the positive and negative poles are the same. Each conducting plate is respectively connected with two adjacent battery cores in the first direction in series, and each protection unit is used for connecting two adjacent conducting plates in the second direction, so that the battery cores connected with the two adjacent conducting plates in the second direction are connected in parallel through the protection unit.

The present invention provides a battery module for improving safety, including: at least one fixed frame; the battery cores are arranged on the fixing frame; the plurality of conducting strips are respectively connected with the two battery cores in series; and at least one protection unit, which is connected with the two conducting strips, so that the battery cores connected with the conducting strips are connected in parallel, wherein when the temperature of the protection unit is higher than a preset temperature or the current passing through the protection unit is higher than a preset current, the protection unit is disconnected.

The battery module for improving the safety is characterized in that the protection unit is a temperature fuse, a current fuse, a solder wire, a single-core copper wire, a self-resetting fuse or a resistor.

The battery module for improving safety is characterized in that a plurality of battery cells are arranged in a matrix manner along a first direction and a second direction, the first direction is vertical to the second direction, the arrangement directions of the battery cells adjacent to each other in the first direction are opposite, and the arrangement directions of the battery cells adjacent to each other in the second direction are the same.

The battery module for improving safety is characterized in that the conducting strips are connected with the battery cores in series to form a series battery core group, and the protection unit is connected with the battery cores of the two series battery core groups in parallel.

The battery module for improving the safety is characterized in that one surface of the fixing frame comprises a plurality of battery core grooves for accommodating and fixing battery cores, the other surface of the fixing frame comprises a plurality of conducting strip grooves for accommodating conducting strips, and the battery core grooves are communicated with the conducting frame grooves.

The battery module for improving the safety is characterized in that the number of the fixing frames is two, and the fixing frames are respectively arranged at two ends of the battery core.

The battery module for improving the safety comprises a first conducting strip and a second conducting strip, wherein the first conducting strip and the second conducting strip are respectively connected with a part of battery core in parallel and are used as an output end or an input end for improving the safety.

The battery module for improving the safety comprises a plurality of first conducting strips and a plurality of second conducting strips, wherein each first conducting strip and each second conducting strip are respectively connected with one battery core, two first conducting strips are connected through a protection unit, and two second conducting strips are also connected through the protection unit.

The battery module for improving safety is characterized in that the conducting strips are used for connecting the battery cores in series, and the protection units are used for connecting the battery cores in parallel.

The invention is described in detail below with reference to the drawings and specific examples, but the invention is not limited thereto.

Drawings

Fig. 1 is a schematic perspective exploded view of an embodiment of the present invention for improving safety.

Fig. 2 is a schematic perspective view of an embodiment of the invention for improving safety.

Fig. 3 and 4 are side views of an embodiment of the present invention for improving safety on different surfaces.

Fig. 5 and 6 are side views of another embodiment of the present invention on different surfaces to improve safety.

Description of the main component symbols:

10 cell module

11 fixed mount

111 cell recess

113 conducting strip groove

13 cell core

131 series battery core group

15 conductive sheet

151 first conductive sheet

153 second conductive sheet

17 protection unit

19 protective plate

Detailed Description

The invention will be described in detail with reference to the following drawings, which are provided for illustration purposes and the like:

please refer to fig. 1 and fig. 2, which are a schematic perspective exploded view and a schematic perspective view of an embodiment of the present invention for improving security. As shown in the drawings, the battery module 10 according to the embodiment of the invention includes at least one fixing frame 11, a plurality of battery cells 13, a plurality of conductive sheets 15 and a plurality of protection units 17, wherein the fixing frame 11 is used for fixing the battery cells 13, the conductive sheets 15 are used for connecting the battery cells 13 in series, and the protection units 17 are used for connecting the battery cells 13 in parallel.

In an embodiment of the present invention, the multiple battery cells 13 may be arranged in a matrix manner, wherein the battery cells 13 are arranged along a first direction X and a second direction Y, and the first direction X is perpendicular to the second direction Y. The arrangement directions of the adjacent battery cells 13 in the first direction X are opposite, wherein the positive and negative electrodes of the adjacent battery cells 13 are respectively opposite, for example, the battery cells 13 arranged along the first direction X are arranged in a manner that the positive and negative electrodes are staggered, and the arrangement directions of the adjacent battery cells 13 in the second direction Y are the same. Of course, the arrangement of the battery cells 13 is only an embodiment of the present invention, and the battery cells 13 may not be arranged in a matrix manner in practical applications.

The fixing frame 11 is mainly used for fixing the battery cell 13, wherein the fixing frame 11 may include a plurality of battery cell recesses 111 for accommodating and fixing the battery cell 13. For example, the battery cell recesses 111 may be arranged in a matrix on one surface of the holder 11, and the battery cells 13 are inserted into the battery cell recesses 111, respectively, such that the battery cells 13 are arranged in a matrix on the holder 11.

In an embodiment of the present invention, the number of the fixing frames 11 may be two, have similar or identical configurations, and are respectively disposed at both ends of the battery cell 13, thereby fixing the battery cell 13 between the two fixing frames 11. For example, one end of the battery cell 13 is disposed at one of the holders 11 and formed in the configuration as shown in fig. 3 or 5, and the other end of the battery cell 13 is disposed at the other holder 11 and formed in the configuration as shown in fig. 4 and 6.

Each conductive sheet 15 connects two battery cells 13 to connect two battery cells 13 in series, and for example, the conductive sheet 15 may connect the positive electrode and the negative electrode of two adjacent battery cells 13 by spot welding or laser welding. When the battery cells 13 are arranged in a matrix, the conductive sheets 15 are used to connect two adjacent battery cells 13 arranged along the first direction X, wherein the positive and negative poles of two adjacent battery cells 13 in the first direction X are in opposite directions, so that the plurality of battery cells 13 in the first direction X are connected in series through the plurality of conductive sheets 15 to form a series battery cell group 131, please refer to fig. 3 and fig. 4. The conductive sheet 15 may be made of metal, such as nickel sheet, copper sheet, etc., with low resistance.

In an embodiment of the present invention, a plurality of conductive plate grooves 113 may be disposed on the surface of the fixing frame 11 not provided with the battery cell grooves 111, wherein each battery cell groove 111 is respectively communicated with one conductive plate groove 113. The conductive plate 15 may be disposed in the conductive plate groove 113 and electrically connected to the battery cell 13 in the battery cell groove 111 communicating with the conductive plate groove 113.

Each protection unit 17 is connected to two conductive sheets 15, so that the two conductive sheets 15 are connected in parallel, and the battery cells 13 connected to the conductive sheets 15 are also connected in parallel through the protection unit 17. When the temperature of the protection unit 17 is higher than a predetermined temperature or the current passing through the protection unit 17 is higher than a predetermined current, the protection unit 17 is turned off.

When one of the battery cells 13 of the battery module 10 malfunctions to be short-circuited, the other normal battery cells 13 will charge the parallel short-circuited battery cell 13 via the protection unit 17, so that the current passing through the protection unit 17 increases and causes the temperature of the protection unit 17 to rise. When the current of the protection unit 17 is greater than the preset current and/or the temperature of the protection unit 17 is greater than the preset temperature, the protection unit 17 will fuse and form an open circuit between the other normal battery cells 13 and the parallel short-circuited battery cells 13, so that the normal battery cells 13 will not charge the parallel short-circuited battery cells 13.

The battery module 10 of the present invention can prevent the other normal battery cells 13 from continuously charging the short-circuited battery cells 13 with a large current, so that the abnormal temperature rise of the short-circuited battery cells 13 can be avoided, thereby effectively reducing the occurrence of the burning or explosion of the battery cells 13 and improving the safety of the battery module 10.

Specifically, the protection unit 17 according to the present invention may include, but is not limited to, a thermal fuse, a current fuse, a solder wire, a single core copper wire, a self-resetting fuse (PTC), a resistor, and the like, which are disconnected due to a rise in current and/or temperature. For example, the solder wires have a relatively low melting point, and thus, when the temperature of the solder wires rises, the solder wires will melt to disconnect the short-circuited battery cells from the normal battery cells connected in parallel. Because the solder wire is arranged with low cost, and only a common electric soldering iron or welding gun is needed to be used, the solder wire (the protection unit 17) can be connected with the two conducting strips 15 so as to be connected with the battery core 13 in parallel. Besides, the characteristics of the single-core copper wire and the resistor are similar to those of the solder wire, and the single-core copper wire and the resistor can be arranged in a similar mode, and the single-core copper wire and the resistor also have the advantages of low arrangement cost and easiness in arrangement.

In practical application, the preset temperature and/or the preset current can be changed by the material, the length, the width and/or the sectional area of the protection unit 17, and the preset temperature is used for explaining that the lead-containing tin wire is generally fused at about 190 ℃ and the lead-free tin wire is fused at about 220 ℃. If the temperature generated when the battery cell 13 fails is 600 degrees celsius or higher, the tin wire (the protection unit 17) will be fused before the battery cell 13 is overheated, fused or exploded, and the connection between the failed battery cell 13 and the parallel normal battery cells 13 is broken. The preset current is used for explaining, when the current of 40-50A is passed through, the general tin wire will be fused due to high temperature, and the current passed when the battery core 13 is short-circuited is about 100-200A, therefore, before the current of the battery core 13 is too large, the tin wire (the protection unit 17) will be fused first, and the connection between the failed battery core 13 and the parallel normal battery core 13 is disconnected, wherein the current value passed when the battery core 13 is short-circuited is related to the characteristics of the battery cores 13 and the number of the parallel battery cores 13.

In addition, a 0603 size 1 ohm resistor is selected as the protection unit 17, which can bear about 1/10W of energy. When the instantaneous current is 100A, the generated energy is far higher than the range that the resistor can bear, and the resistor is blown, so that the connection between the failed battery cell 13 and the parallel normal battery cell 13 can be disconnected.

The battery module 10 further includes at least one first conductive sheet 151 and at least one second conductive sheet 153, wherein the first conductive sheet 151 and the second conductive sheet 153 are used for connecting a portion of the battery cells 13 in parallel and serve as an output terminal and/or an input terminal of the battery module 10, as shown in fig. 1 to 4. For example, the battery cells 13 may be rechargeable batteries, and the first conductive sheet 151 and the second conductive sheet 153 may output electric energy, or each battery cell 13 may be charged through the first conductive sheet 151 and the second conductive sheet 153. Generally, the first conductive sheet 151 and the second conductive sheet 153 are usually connected to one or more battery cells 13 at the most lateral side, for example, connected or connected in parallel to a plurality of battery cells 13 at the most lateral side and arranged along the second direction Y.

In another embodiment of the present invention, the number of the first conductive sheets 151 and the second conductive sheets 153 may be multiple, wherein each of the first conductive sheets 151 and each of the second conductive sheets 153 are respectively connected to one battery cell 13, as shown in fig. 5 and 6. In addition, two adjacent first conductive sheets 151 and two adjacent second conductive sheets 153 are connected through a protection unit 17, so as to protect the battery cell 13 connected by the first conductive sheets 151 and the second conductive sheets 153.

In an embodiment of the invention, the plurality of battery cells 13 are arranged in a 9 by 3 matrix, wherein nine battery cells 13 are arranged in the first direction X, and three battery cells 13 are arranged in the second direction Y, and the first direction X is approximately perpendicular to the second direction Y, as shown in fig. 3 and 4. In other words, the battery module 10 may include twenty-seven battery cells 13, twenty-four conductive sheets 15, and sixteen protection units 17, wherein nine battery cells 13 in the first direction X are connected in series by eight conductive sheets 17, and form a series battery core group 131. In addition, the three battery cells 13 in the second direction Y are connected in parallel by the two protection units 17, for example, three battery core groups 131 connected in series can be stacked, and the adjacent two battery core groups 131 connected in series can be connected by the eight protection units 17, wherein the protection units 17 connect the adjacent two conductive sheets 17 to connect the battery cells 13 of the adjacent two battery core groups 131 in series in parallel.

In other words, in the above-described embodiment of the present invention, the nine battery cells 13 in the first direction X are mainly connected in series to increase the voltage output by the battery module 10, and the three battery cells 13 in the second direction Y are connected in parallel to increase the power of the battery module 10. Specifically, when the battery cell 13 is a 3.7V lithium battery cell, the battery module 10 may generate a voltage of 33.3V. Of course, the number and arrangement of the battery cells 13, the conductive layers 15 and the protection units 17 are only an embodiment of the present invention, and are not limited by the scope of the claims of the present invention, and the number and arrangement of the battery cells 13, the conductive layers 15 and the protection units 17 can be adjusted according to the requirements of the product in practical applications.

In an embodiment of the present invention, the battery module 10 may include a protection plate 19 electrically connected to the battery cell 13, wherein the protection plate 19 may include a protection circuit board and a current device such as a PTC (self-healing fuse), so as to accurately monitor the voltage and the charge/discharge current of the battery cell 13, timely control the on/off of the current loop, and prevent the battery cell 13 from being damaged in a high temperature environment.

The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.