KR102256481B1 - Charging and discharging device for battery cell and inspection system for battery cell comprising the same - Google Patents

Abstract

The present invention is a battery cell charging and discharging device for charging and discharging the battery cell, the inner heat insulating case in which the battery cell is seated; An outer insulating case in which the inner insulating case is embedded; And a charging/discharging unit connected to the first electrode lead and the second electrode lead provided in the battery cell and charging or discharging the battery cell.

Description

Battery cell charging/discharging device and inspection system for battery cell including the same {CHARGING AND DISCHARGING DEVICE FOR BATTERY CELL AND INSPECTION SYSTEM FOR BATTERY CELL COMPRISING THE SAME}

The present invention relates to a charging/discharging device for a battery cell and an inspection system for a battery cell including the same, and in particular, to a charging/discharging device for a battery cell capable of accurately inspecting a temperature change during charging and discharging of the battery cell, and an inspection system for a battery cell including the same. will be.

In general, a secondary battery refers to a battery capable of charging and discharging unlike a primary battery that cannot be charged, and such a secondary battery is widely used in the field of advanced electronic devices such as phones, notebook computers, and camcorders.

Such a secondary battery includes one or more battery cells, and the battery cell may include an electrode assembly, an electrolyte, and a case for accommodating the electrode assembly and the electrolyte.

Meanwhile, as one of the safety tests, the battery cell is inspected for defects by measuring temperature changes during charging and discharging. That is, whether the battery cell is defective is inspected according to whether the temperature change occurring during charging and discharging of the battery cell is within the set temperature range or outside the set temperature range.

However, the battery cell may have a large temperature change depending on the external environment, and thus, there is a problem in that it is not possible to accurately measure the temperature change occurring during charging and discharging of the battery cell.

Patent registration number 10-0958649

The present invention was invented to solve the above problems, and the object of the present invention is to prevent temperature changes occurring during charging and discharging of the battery cells, and as a result, it is possible to accurately measure temperature changes occurring during charging and discharging of the battery cells. It is to propose a battery cell charging and discharging device and a battery cell inspection system including the same.

A charging and discharging apparatus for a battery cell according to a first embodiment of the present invention for solving the above problems includes: an inner insulating case in which the battery cell is seated; An outer insulating case in which the inner insulating case is embedded; And a charging/discharging unit connected to the first electrode lead and the second electrode lead provided in the battery cell and charging or discharging the battery cell.

The inner insulating case and the outer insulating case may be provided with the same insulating material.

The inner insulating case and the outer insulating case may be provided with a material of bakelite.

The inner heat insulating case may form a receiving groove in which the battery cell is accommodated.

The outer insulating case includes an insertion box having an insertion space into which the inner insulating case is inserted, and a cover sealing the insertion space of the insertion box, and the insertion box and the cover may be made of the same insulating material.

The charging/discharging part is provided on the outer heat-insulating case upper surface, and first and second fixing jigs for pressing and fixing the first and second electrode leads of the battery cells accommodated in the inner heat-insulating case, respectively, and provided outside the outer case And a charging/discharging member connected to the first and second fixing jigs and charging and discharging the battery cells through the first and second fixing jigs.

On the other hand, the battery cell inspection system according to the second embodiment of the present invention is connected to the charging/discharging device for the battery cell and the charging/discharging device, and inspecting the temperature change of the battery cell when the battery cell is charged and discharged. It may include.

A temperature sensor attached to the battery cell accommodated in the inner heat insulating case of the charging/discharging device and measuring the charging and discharging temperature of the battery cell, and the temperature sensor provided outside the outer heat insulating case of the charging/discharging device and measured through the temperature sensor. An inspection member for inspecting a temperature change of the battery cell, and a connection line connecting the temperature sensor and the inspection member through an insertion hole formed in the outer insulating case.

The present invention has the following effects.

1. The charging/discharging device of the present invention includes an inner insulating case and an outer insulating case for accommodating a battery cell, and accordingly accommodates the battery cells in multiple stages to greatly reduce heat loss generated during charging and discharging of the battery cells. And, as a result, it is possible to prevent the temperature change of the battery cell.

2. In the present invention, the inner insulating case and the outer insulating case are provided with the same insulating material, and accordingly, the heat loss generated during charging and discharging of the battery cell can be more stably reduced, and in particular, the material purchase cost can be greatly reduced, which is competitive Can increase.

3. In the present invention, the inner insulating case and the outer insulating case may be provided with a material of bakelite, and the beklite is a thermosetting resin that is widely used as a filler, so that heat loss generated during charging and discharging of a battery cell is more prevented. It can be effectively prevented.

4. In the present invention, the inner insulation case has a receiving groove in which the battery cell is accommodated, and can support all surfaces except the upper surface of the battery cell by the receiving groove, and as a result, the battery cell can be stably fixed. In addition, it is possible to more effectively prevent heat loss that occurs during charging and discharging.

5. The present invention is provided with an inspection system for battery cells including a charging and discharging device and an inspection device, and accordingly, it is possible to more accurately inspect temperature changes occurring during charging and discharging of the battery cells, and as a result Whether or not can be clearly selected.

1 is an exploded perspective view showing a charging and discharging device for a battery cell according to a first embodiment of the present invention.
Figure 2 is an assembly perspective view showing a charging and discharging device for a battery cell according to the first embodiment of the present invention.
3 is a cross-sectional view showing a charging and discharging device for a battery cell according to a first embodiment of the present invention.
Figure 4 is an exploded perspective view showing a battery cell inspection system according to a second embodiment of the present invention.
Figure 5 is an assembly perspective view showing a battery cell inspection system according to a second embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art can easily implement the present invention. However, the present invention may be implemented in various different forms and is not limited to the embodiments described herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and similar reference numerals are attached to similar parts throughout the specification.

[Charging/discharging device for battery cells according to the first embodiment]

The charging/discharging apparatus for a battery cell according to the first embodiment of the present invention is for charging and discharging the battery cells, and in particular, has a structure that effectively prevents heat loss that occurs during charging and discharging of the battery cells.

For example, the charging and discharging device 100 for a battery cell according to the first embodiment of the present invention, as shown in Figs. 1 to 3, the inner insulation case 110 in which the battery cell 10 is seated, the The battery cell 10 is connected to the outer insulating case 120 in which the inner insulating case 110 is embedded, and the first electrode lead 11 and the second electrode lead 12 provided in the battery cell 10 It may include a charging and discharging unit 130 for charging or discharging.

The inner insulating case 110 is to block heat loss of the battery cell 10 while the battery cell 10 is seated on the upper surface, and has a predetermined thickness so that the battery cell 10 is stably seated. , It is provided with an insulating material to prevent heat loss of the battery cell 10. In addition, a receiving groove 111 for accommodating the battery cell 10 is formed on the upper surface of the inner insulation case 110, and the receiving groove 111 supports the remaining surfaces of the battery cell 10 except for the upper surface of the battery cell. The cell 10 can be stably seated, and heat loss of the battery cell 10 can be more effectively prevented.

On the other hand, the depth of the receiving groove 111 may be formed larger than the thickness of the battery cell 10 in the vertical direction, and thus, the battery cell 10 can be stably expanded even if the volume of the battery cell 10 expands during charging and discharging. It can be seated, and in particular, it is possible to prevent the problem that the cover of the outer insulation case 120 is opened due to the expansion pressure of the battery cell 10.

On the other hand, the inner insulating case 110 may be provided with a heat insulating material having elasticity, and accordingly, the receiving groove 111 through the elasticity of the inner insulating case 111 even if the battery cell 10 is larger than that of the receiving groove 111 ) Can be seated by inserting the battery cell 10.

On the other hand, the inner insulation case 110 may be provided with a material of bakelite, the beklite is a kind of thermosetting resin based on fillers, lubricants and hardeners, and ease of molding, versatility, and temperature resistance. It has conductivity and chemical resistance, and has particularly excellent electrical heat insulation properties. As the bekrite having such a characteristic is used as a material for the inner heat insulating case 110, heat loss of the battery cell 10 can be more effectively prevented.

The outer insulating case 120 has an inner insulating case 110, and accordingly, is to block the heat loss of the battery cell 10 accommodated in the inner insulating case 110, and is opened by a cover. It has a box shape. That is, the outer thermal insulation case 120 includes an insertion box 121 having an insertion space 121a into which the inner thermal insulation case 110 is inserted, and an insertion space of the insertion box 121 ( It includes a cover 122 that seals 121a).

Such an outer insulating case 120 inserts the inner insulating case 110 accommodating the battery cell 10 into the insertion box 121, and then seals the insertion box 121 with the cover 122, and accordingly Heat loss outside the outer insulation case 120 can be blocked, and as a result, heat loss generated during charging and discharging of the battery cell 10 can be secondarily blocked.

On the other hand, the insertion box 121 and the cover 122 may be provided with the same insulating material, and accordingly, the material purchase cost can be greatly reduced, and in particular, the insulating properties of the entire outer insulating case can be equally matched, and as a result, the battery It is possible to greatly reduce a temperature change occurring during charging and discharging of the cell 10.

On the other hand, the inner insulating case 110 and the outer insulating case 120 may be provided with the same insulating material, thereby greatly reducing the purchase cost of the insulating material, in particular, the inner insulating case 110 and the outer insulating It has the effect of configuring the case 120 as a single insulation product, and as a result, uniformly insulates the entire battery cell 10 accommodated in the inner insulation case 110 and the outer insulation case 120, and heats it evenly. By preventing loss, it can have the effect of largely preventing the temperature change of the battery cell.

On the other hand, the outer thermal insulation case 120 may be provided with the same material of the bakelite (bakelite) as the inner thermal insulation case 110, accordingly, it is possible to more effectively prevent heat loss of the battery cell 10.

The charging/discharging unit 130 is for charging or discharging the battery cells 10 accommodated in the inner insulating case 110, and is respectively installed between the insertion box 121 and the cover 122, and the inner insulating case First and second fixing jigs 131 and 132 respectively pressing and fixing the first and second electrode leads 11 and 12 of the battery cell 10 accommodated in 110, and the outer insulating case (120) It is provided outside, connected to the first and second fixing jigs 131, 132, and charging and discharging the battery cell 10 through the first and second fixing jigs 131 and 132 It may include a charging and discharging member 133.

Here, the first and second fixing jigs 131 and 132 have one surface connected to the charging/discharging member 133 (when viewed in FIG. 2, the first and second fixing jigs 131 and 132 are not viewed from each other. The rest of the surfaces except the outer surface) may be formed to be located inside the outer insulating case 120, and accordingly, the gap between the outer insulating case 120 and the first and second fixing jigs 131 and 132 It is possible to minimize the occurrence of heat loss.

In addition, an insertion groove into which the first and second fixing jigs 131 and 132 are inserted may be formed in the cover 122, and accordingly, the insertion box 121 and the cover 122 may be closely coupled. .

The charging/discharging unit 130 as described above stably charges the battery cell 10 while the charging/discharging member 133, the first and second fixing jigs 131 and 132, and the battery cell 10 are connected. It can be discharged, and in particular, heat generated during charging and discharging of the battery cell is blocked in multiple stages by the inner heat insulating case 110 and the outer heat insulating case 120, thereby greatly reducing heat loss.

Therefore, the charging/discharging apparatus 100 for a battery cell according to the first embodiment of the present invention can stably charge and discharge the battery cell 10, and in particular, effectively reduce heat loss generated during charging and discharging of the battery cell 10. Can be prevented.

On the other hand, it is possible to provide a battery cell inspection system including the battery cell charging and discharging device 100 according to the first embodiment of the present invention.

[Inspection system for battery cells according to the second embodiment]

The battery cell inspection system according to the second embodiment of the present invention has a structure including the charging/discharging device 100 for a battery cell according to the first embodiment, and accordingly, a temperature change occurring during charging and discharging of the battery cell is more accurately It can be measured, and as a result, it is possible to clearly select whether a battery cell is defective or not before commercialization.

For example, the battery cell inspection system according to the second embodiment of the present invention includes a battery cell charging/discharging device 100 and a battery cell charging/discharging device 100 as shown in FIGS. 4 and 5. It may include an inspection device 200 that is connected and inspects a temperature change of the battery cell 10 when charging and discharging the battery cell 10.

The charging/discharging device 100 includes an inner insulating case 110 in which the battery cell 10 is mounted, an outer insulating case 120 in which the inner insulating case 110 is mounted, and the battery cell 10. A charging/discharging part 130 connected to the first electrode lead 11 and the second electrode lead 12 and charging or discharging the battery cell 10 may be included.

Here, the charging/discharging apparatus 100 has the same configuration and function as the charging/discharging apparatus 100 for a battery cell according to the first embodiment, and thus a detailed description thereof will be omitted.

The inspection device 200 is a temperature sensor 210 attached to the battery cell 10 built in the inner insulation case 110 of the charging/discharging device 100 and measuring the charging and discharging temperature of the battery cell 10 And, an inspection member 220 provided outside the outer thermal insulation case 120 of the charging/discharging device 100 and inspecting the temperature change of the battery cell 10 measured through the temperature sensor 210, and the A connection line 230 connecting the temperature sensor 210 and the inspection member 220 through an insertion hole 121b formed in the outer insulating case 120 may be included.

When heat is generated during charging and discharging of the battery cell 10, the test device 200 measures the temperature in real time and transmits it to the test member 220, and the test member 220 The charging and discharging temperature of the battery cell 10 transmitted from the temperature sensor 210 is recorded in real time and displayed through a monitor or the like. In particular, the inspection device 200 connects the temperature sensor 210 and the inspection member 220 through the insertion hole 121b through which the connection line 230 passes, and accordingly, heats from the inside of the charging/discharging device 100 to the outside. Loss can be largely avoided. In order to maximize heat loss prevention, the size of the insertion hole 121b may have a size that fits the size of the circumference of the connection line 230.

Accordingly, the battery cell inspection system according to the second exemplary embodiment of the present invention includes a charging/discharging device 100 for a battery cell, so that a temperature change occurring during charging and discharging of the battery cell 10 can be more accurately measured.

[Experimental Example]

On the other hand, the temperature change of the battery cell is tested using the battery cell inspection system according to an embodiment of the present invention. Here, the temperature sensor 210 is attached to the surfaces of the first electrode lead 11, the second electrode lead 12, and the battery cell 10, respectively, for an experiment.

Example 1

The battery cell (E52C) is charged or discharged with a charging current of 1/3C. Then, the temperature sensor 210 detects the temperature change of the battery cell and displays the following graph.

<Charge capacity (Ah)>

<Discharge capacity (Ah)>

That is, the rate of increase in temperature during 1/3 charge/discharge is 7-10°C based on the battery cell, and the rate of increase in temperature between charging and discharging at low current is similar.

The graph as above is summarized in a table as follows.

Example 2

The battery cell (E52C) is charged or discharged with a charging current of 1C. Then, the temperature sensor 210 detects the temperature change of the battery cell and displays the following graph.

<Charge capacity (Ah)>

<Discharge capacity (Ah)>

That is, the rate of temperature increase during 1C charging occurs about twice as high as the rate of temperature increase during discharge.

The graph as above is summarized in a table as follows.

Example 3

The battery cell (P37D) is charged or discharged with a charging current of 1/3C. Then, the temperature sensor 210 detects the temperature change of the battery cell and displays the following graph.

<Charge capacity (Ah)>

<Discharge capacity (Ah)>

That is, when charging at 1/3C, the temperature rise due to heat generation in the positive electrode lead, which is the first electrode lead, is higher than that of the negative electrode lead, which is the second electrode lead, and the temperature change occurs in the order of the positive electrode lead, the battery cell surface, and the negative electrode lead. , A decrease in temperature after charging and an increase in temperature after discharging are observed.

The graph as above is summarized in a table as follows.

Example 4

The battery cell (P37D) is charged or discharged with a charging current of 1C. Then, the temperature sensor 210 detects the temperature change of the battery cell and displays the following graph.

<Charge capacity (Ah)>

<Discharge capacity (Ah)>

In other words, heat generation at 1C charging is higher under 1C charging conditions than 1/3C.

The graph as above is summarized in a table as follows.

The scope of the present invention is indicated by the claims to be described later rather than the detailed description, and various embodiments derived from the meaning and scope of the claims and their equivalent concepts are possible.

100: battery cell charging and discharging device
110: inner insulation case
120: outer insulation case
130: charge/discharge member
200: inspection device
210: temperature sensor
220: inspection member
230: connecting line

Claims (8)

As a battery cell charging and discharging device for charging and discharging battery cells,
An inner insulating case in which the battery cell is seated;
An outer insulating case in which the inner insulating case is embedded; And
A charging/discharging part connected to the first electrode lead and the second electrode lead provided in the battery cell and charging or discharging the battery cell,
The outer insulating case includes an insertion box having an insertion space into which the inner insulating case is inserted, and a cover sealing the insertion space of the insertion box,
The insert box and the cover are provided with the same insulating material,
The charging/discharging unit first and second fixing jigs installed between the insert box and the cover of the outer insulating case and configured to press and fix the first and second electrode leads of the battery cells accommodated in the inner insulating case, respectively, and the Charging and discharging device for a battery cell comprising a charging and discharging member provided outside the outer insulation case, connected to the first and second fixing jigs, and charging and discharging the battery cells through the first and second fixing jigs. The method according to claim 1,
The inner insulating case and the outer insulating case is a battery cell charging and discharging device provided with the same insulating material. The method according to claim 2,
The inner heat insulating case and the outer heat insulating case is a battery cell charging and discharging device provided with a material of bakelite. The method according to claim 1,
The inner heat insulating case is a charging/discharging device for a battery cell in which an accommodation groove in which the battery cell is accommodated is formed. delete delete Charge and discharge device for a battery cell provided by any one of claims 1 to 4; And
An inspection system for a battery cell comprising an inspection device connected to the charging/discharging device for the battery cell and inspecting a temperature change of the battery cell during charging and discharging of the battery cell. The method of claim 7,
The inspection device,
A temperature sensor attached to a battery cell accommodated in an inner insulation case of the battery cell charging/discharging device and measuring the charging and discharging temperature of the battery cell, and a temperature sensor provided outside the outer thermal insulation case of the battery cell charging/discharging device. An inspection system for a battery cell comprising an inspection member for inspecting a temperature change of the battery cell measured through, and a connection line connecting the temperature sensor and the inspection member through an insertion hole formed in the outer insulating case.

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