TWM589368U - Battery module for imprving safety - Google Patents

Abstract

The invention provides a battery module for improving safety, comprising at least one fixing frame, a plurality of battery cells, a plurality of conductive sheets and a plurality of protection units, wherein the battery cells are disposed on the fixing frame. Each of the conductive sheets is connected in series with two battery cells, and each of the protection units is respectively connected with two conductive sheets, so that the battery cells connected by the conductive sheets are connected in parallel through the protection unit. When the temperature of the protection unit is greater than a preset temperature, or the current through the protection unit is greater than a predetermined current, the protection unit will be blown, thereby preventing the parallel battery cells from charging the faulty battery cells abnormally, resulting in the faulty battery cell to melt or explode, and it is beneficial to improve the safety of the battery module.

Description

Battery module capable of improving safety

The present invention provides a battery module with improved safety, which can prevent the parallel battery cells from abnormally charging the faulty battery cell, which can cause the faulty battery cell to melt or explode, and help to improve the battery module safety.

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

Generally speaking, a plurality of battery cells can be arranged on a fixing frame, and each battery cell can be connected in series and in parallel through a conductive sheet to form a battery pack, and the battery pack is installed on the product.

In actual application, if one of the battery cells in the battery pack fails to cause a short circuit, it will cause other normal battery cells to charge the short circuit battery cell with high current, which will cause the temperature of the short circuit battery cell to be abnormal. rise. When the temperature exceeds the temperature that the isolation layer inside the battery core can withstand, it will cause the isolation layer to dissolve, causing the positive and negative electrode materials of the battery core to short-circuit, thereby causing the battery core to melt or explode.

An object of the present invention is to provide a battery module capable of improving safety, including a plurality of battery cells, a plurality of conductive sheets, and a plurality of protection units, wherein the conductive sheets are used to connect the battery cells in series, and the protection unit is used to connect in parallel Battery cell. When the temperature of the protection unit is too high and/or the current is too large, the protection unit will be melted, and the faulty battery cell and the normal battery cell connected in parallel will be disconnected to prevent the faulty battery cell from melting or exploding.

An object of the present invention is to provide a battery module that can improve safety, including 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 arranged on the fixing frame and can be matrixed Way. The battery cells adjacent in the first direction are arranged in the opposite manner of the positive and negative electrodes, while the battery cells in the second direction are arranged in the same manner of the positive and negative electrodes. Each conductive sheet is connected in series with two adjacent battery cells in the first direction, and each protection unit is used to connect two adjacent conductive sheets in the second direction, so that the two adjacent conductive sheets in the second direction are connected The battery cells are connected in parallel via the protection unit.

The present invention provides a battery module that can improve safety, including: at least one fixing frame; a plurality of battery cells, which are arranged on the fixing frame; a plurality of conductive sheets, respectively connecting two battery cells in series; and at least one protection unit, connecting two A conductive sheet makes the battery cells connected to the conductive sheet parallel, wherein when the temperature of the protection unit is greater than a preset temperature, or the current through the protection unit is greater than a preset current, the protection unit will be disconnected.

In the battery module with improved safety, the protection unit is a temperature fuse, a current fuse, a solder wire, a single-core copper wire, a resettable fuse, or a resistor.

The battery module with improved safety, wherein a 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, and the adjacent battery cells in the first direction The arrangement direction is opposite, and the arrangement direction of adjacent battery cells in the second direction is the same.

In the battery module with improved safety, the conductive sheet is connected in series with the battery cells to form a series battery cell group, and the protection unit is connected in parallel with two battery cells of the series battery cell group.

In the battery module with improved safety, one surface of the fixing frame includes a plurality of battery cell grooves for accommodating and fixing the battery cells, and the other surface of the fixing frame includes a plurality of conductive sheet grooves for To accommodate the conductive sheet, and the groove of the battery core communicates with the groove of the conductive frame.

In the battery module capable of improving safety, the number of the fixing frames is two, and they are respectively arranged at both ends of the battery core.

The battery module capable of improving safety includes a first conductive sheet and a second conductive sheet, the first conductive sheet and the second conductive sheet are respectively connected in parallel to a part of the battery core, and serve as a battery module for improving safety Output or input.

The battery module capable of improving safety includes a plurality of first conductive sheets and a plurality of second conductive sheets, each first conductive sheet and each second conductive sheet are respectively connected to one of the battery cells, and two of the first conductive sheets The sheets are connected through the protection unit, and the two second conductive sheets are also connected through the protection unit.

In the battery module with improved safety, the conductive sheet is used to connect battery cells in series, and the protection unit is used to connect battery cells in parallel.

Please refer to FIGS. 1 and 2, which are respectively a three-dimensional exploded schematic diagram and a three-dimensional schematic diagram of an embodiment of a novel battery module capable of improving safety. As shown, the battery module 10 according to the embodiment of the present 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 to fix the battery cells 13. The conductive sheet 15 is used to connect the battery cells 13 in series, and the protection unit 17 is used to connect the battery cells 13 in parallel.

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

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 grooves 111 for accommodating and fixing the battery cell 13. For example, the battery cell grooves 111 may be arranged on one surface of the fixing frame 11 in a matrix manner, and each battery cell 13 is inserted into each battery cell groove 111 respectively, so that the battery cells 13 are arranged on the fixing frame 11 in a matrix manner.

In an embodiment of the present invention, the number of the fixing frames 11 may be two, have similar or identical structures, and are respectively provided at both ends of the battery core 13, thereby fixing the battery core 13 between the two fixing frames 11 between. For example, one end of the battery cell 13 is set in one of the fixing frames 11 and forms the structure as described in FIG. 3 or FIG. 5, and the other end of the battery cell 13 is set in the other fixing frame 11 and is formed as shown in FIGS. 4 and 5. 6. The structure described.

Each conductive sheet 15 is connected to two battery cells 13 respectively, and two battery cells 13 are connected in series. For example, the conductive sheet 15 can be connected to the positive electrode and the negative electrode of two adjacent battery cells 13 through spot welding or laser welding. When the battery cells 13 are arranged in a matrix, the conductive sheet 15 is used to connect two adjacent battery cells 13 arranged along the first direction X, wherein the two adjacent battery cells 13 in the first direction X The negative electrode is in the opposite direction, so that a plurality of battery cells 13 in the first direction X are connected in series via a 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 can be made of a metal material, such as a nickel sheet, a copper sheet, and other low-resistance materials.

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

Each protection unit 17 is respectively 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 via the protection unit 17. When the temperature of the protection unit 17 is greater than a preset temperature, or the current through the protection unit 17 is greater than a preset current, the protection unit 17 will be disconnected.

When one of the battery cells 13 of the battery module 10 fails and is short-circuited, the other normal battery cells 13 will charge the parallel short-circuited battery cells 13 via the protection unit 17, so that the current passing through the protection unit 17 increases and causes the protection unit The temperature of 17 rises. 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-circuit battery cells 13 , So that the normal battery cell 13 will not charge the parallel short-circuited battery cell 13.

The battery module 10 according to the present invention can prevent the conventional battery cell 13 of the conventional technology from continuously charging the short-circuited battery cell 13 with a large current, so that the temperature of the short-circuited battery cell 13 can be prevented from rising abnormally. This can effectively reduce the occurrence of the battery core 13 burning or exploding, so as to improve the safety of the battery module 10.

Specifically, the protection unit 17 of the present invention may include, but is not limited to, temperature fuse, current fuse, solder wire, single-core copper wire, resettable fuse (PTC), resistance, etc. due to current and/or temperature rise Disconnected components. For example, the melting point of the solder wire is relatively low, so when the temperature of the solder wire rises, the solder wire will melt to disconnect the short-circuited battery cell and the normal battery cell connected in parallel. Since the installation cost of the solder wire is low, and only a general electric iron or welding gun is needed, the solder wire (protection unit 17) can be connected to the two conductive sheets 15 to connect the battery cells 13 in parallel. In addition, the characteristics of the single-core copper wire and the resistance are also similar to those of the solder wire, and can be arranged in a similar manner, which also has the advantages of low installation cost and easy installation.

In actual application, the preset temperature and/or the preset current can be changed through the material, length, width and/or cross-sectional area of the protection unit 17 to explain the preset temperature. Generally, tin wire containing lead will be around It melts at about 190 degrees, and the lead-free tin wire is dating to melt at about 220 degrees Celsius. If the temperature generated when the battery cell 13 fails is above 600 degrees Celsius, the tin wire (protection unit 17) will first blow before the battery cell 13 overheats, melts, or explodes, and disconnects the failed battery cell 13 in parallel The connection between the normal battery cells 13. To explain with a preset current, the general tin wire will be fused due to high temperature when passing a current of 40-50A, and the current flowing when the battery cell 13 is short-circuited is about 100-200A, so the current in the battery cell 13 is too large Before, the tin wire (protection unit 17) would fuse first and disconnect the connection between the failed battery cell 13 and the normal battery cell 13 connected in parallel, wherein the current value flowing when the battery cell 13 is short-circuited and the battery cell 13 The characteristics are related to the number of battery cells 13 connected in parallel.

In addition, if a 1 ohm resistor with a size of 0603 is selected as the protection unit 17, it can withstand about 1/10W of energy. When the instantaneous current is 100A, the energy generated will be much higher than the resistance range of the resistance, and lead to the resistance fuse, which can also break the connection between the failed battery cell 13 and the normal battery cell 13 in parallel.

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 to parallel part of the battery core 13 and serve as The output and/or input are shown in Figures 1 to 4. For example, the battery cell 13 may be a rechargeable battery, and the first conductive sheet 151 and the second conductive sheet 153 may output electrical energy, or the respective battery cells 13 may be charged via the first conductive sheet 151 and the second conductive sheet 153. Generally speaking, the first conductive sheet 151 and the second conductive sheet 153 are usually connected to one or more battery cells 13 on the most lateral side, for example, a plurality of battery cells 13 located on the most lateral side and arranged along the second direction Y are connected or connected in parallel Battery cell 13.

In another embodiment of the present invention, the number of the first conductive sheet 151 and the second conductive sheet 153 may be plural, wherein each first conductive sheet 151 and each second conductive sheet 153 are respectively connected to a battery core 13, as shown in FIG. 5 and 6 are shown. In addition, two adjacent first conductive sheets 151 and adjacent second conductive sheets 153 are respectively connected through a protection unit 17, thereby protecting the battery cell 13 connected by the first conductive sheet 151 and the second conductive sheet 153.

In an embodiment of the present invention, a plurality of battery cells 13 are arranged in a matrix of 9 by 3, 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 One direction X is approximately perpendicular to the second direction Y, as shown in FIGS. 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 pass through the eight conductive sheets 17 It is connected in series and forms a series battery cell group 131. In addition, three battery cells 13 in the second direction Y are connected in parallel through two protection units 17, for example, three series battery cell groups 131 can be stacked and connected to two adjacent series batteries through eight protection units 17 The core group 131 in which the protection unit 17 connects two adjacent conductive sheets 17 to parallel connect the battery cells 13 of two adjacent battery cell groups 131 connected in series.

In other words, in the above-described embodiment of the present invention, 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 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 can generate a voltage of 33.3V. Of course, the number and arrangement of the battery cells 13, the conductive layer 15 and the protection unit 17 are only an embodiment of the present invention, and are not limited by the scope of the rights of the new model. In practical applications, the battery cell 13, the conductive layer 15 and the protection unit 17 The quantity and setting method can be adjusted according to the demand of the product.

In an embodiment of the present invention, the battery module 10 may include a protection board 19 electrically connected to the battery core 13, wherein the protection board 19 may include a protection circuit board and a PTC (self-resetting fuse) and other current devices, with accurate monitoring The voltage and charging/discharging current of the battery core 13 and timely control of the on-off of the current loop, and can prevent the damage of the battery core 13 in a high-temperature environment.

The above is only one of the preferred embodiments of the new model, and is not intended to limit the scope of the implementation of the new model, that is, any changes in shape, structure, features and spirit described in the patent application of the new model Modifications should be included in the patent application of this new model.

10‧‧‧ battery module 11‧‧‧Fixing frame 111‧‧‧Battery cell groove 113‧‧‧Conductive sheet groove 13‧‧‧ battery cell 131‧‧‧series battery pack 15‧‧‧Conductive sheet 151‧‧‧The first conductive sheet 153‧‧‧Second conductive sheet 17‧‧‧Protection unit 19‧‧‧Protection board

FIG. 1 is an exploded perspective view of an embodiment of the new battery module with improved safety.

FIG. 2 is a perspective schematic view of an embodiment of the new battery module with improved safety.

Fig. 3 and Fig. 4 are respectively side views of different embodiments of a novel battery module which can improve safety on different surfaces.

FIG. 5 and FIG. 6 are respectively side views of different embodiments of the new battery module with improved safety on different surfaces.

10‧‧‧ battery module

11‧‧‧Fixing frame

111‧‧‧Battery cell groove

113‧‧‧Conductive sheet groove

13‧‧‧ battery cell

15‧‧‧Conductive sheet

151‧‧‧The first conductive sheet

153‧‧‧Second conductive sheet

17‧‧‧Protection unit

19‧‧‧Protection board

Claims (9)

A battery module that can improve safety includes: At least one fixing frame; A plurality of battery cells are installed on the fixing frame; A plurality of conductive sheets, two battery cells in series; and At least one protection unit, connected to the two conductive sheets, so that the battery cells connected to the conductive sheet are connected in parallel, wherein when the temperature of the protection unit is greater than a preset temperature, or the current through the protection unit is greater than a preset current , The protection unit will be disconnected. The battery module with improved safety as described in item 1 of the patent application scope, wherein the protection unit is a temperature fuse, a current fuse, a solder wire, a single-core copper wire, a resettable fuse, or a resistor. The battery module with improved safety as described in item 1 of the patent application scope, 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 adjacent battery cells in the first direction are opposite, and the arrangement directions of the adjacent battery cells in the second direction are the same. The battery module with improved safety as described in item 1 of the patent application scope, wherein the conductive sheet is connected in series with the battery cells to form a series battery cell group, and the protection unit is connected in parallel with the two batteries of the series battery cell group core. The battery module with improved safety as described in item 1 of the patent application scope, wherein one surface of the fixing frame includes a plurality of battery cell grooves for accommodating and fixing the battery cell, and the other surface of the fixing frame It includes a plurality of conductive sheet grooves for accommodating the conductive sheet, and the battery cell groove communicates with the conductive frame groove. As described in Item 5 of the patent application scope, a battery module with improved safety, wherein the number of the fixing frame is two, and they are respectively provided at both ends of the battery core. The battery module capable of improving safety as described in item 1 of the patent application scope includes a first conductive sheet and a second conductive sheet, the first conductive sheet and the second conductive sheet are respectively connected in parallel to a part of the battery core, and As the output end or input end of the battery module which can improve safety. The battery module capable of improving safety as described in item 1 of the patent application scope includes a plurality of first conductive sheets and a plurality of second conductive sheets, each of the first conductive sheet and each of the second conductive sheets are respectively connected to one In the battery cell, two of the first conductive sheets are connected through the protection unit, and two of the second conductive sheets are also connected through the protection unit. As described in item 1 of the patent application scope, a battery module with improved safety, wherein the conductive sheet is used to connect the battery cells in series, and the protection unit is used to connect the battery cells in parallel.

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