CN210129534U - Nonaqueous electrolyte secondary battery - Google Patents
Nonaqueous electrolyte secondary battery Download PDFInfo
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- CN210129534U CN210129534U CN201921084888.6U CN201921084888U CN210129534U CN 210129534 U CN210129534 U CN 210129534U CN 201921084888 U CN201921084888 U CN 201921084888U CN 210129534 U CN210129534 U CN 210129534U
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- adhesive layer
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- nonaqueous electrolyte
- secondary battery
- battery
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- 239000011255 nonaqueous electrolyte Substances 0.000 title claims abstract description 60
- 239000012790 adhesive layer Substances 0.000 claims abstract description 105
- 239000000853 adhesive Substances 0.000 claims description 23
- 230000001070 adhesive effect Effects 0.000 claims description 22
- 239000000463 material Substances 0.000 claims description 18
- 238000007599 discharging Methods 0.000 claims description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 10
- 229910052744 lithium Inorganic materials 0.000 abstract description 10
- 230000008021 deposition Effects 0.000 abstract description 6
- 229920001807 Urea-formaldehyde Polymers 0.000 description 9
- 238000005259 measurement Methods 0.000 description 7
- 239000004743 Polypropylene Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- -1 nickel metal hydride Chemical class 0.000 description 6
- 229920001155 polypropylene Polymers 0.000 description 6
- 229920005989 resin Polymers 0.000 description 6
- 239000011347 resin Substances 0.000 description 6
- 230000008602 contraction Effects 0.000 description 5
- 239000000843 powder Substances 0.000 description 4
- GZCGUPFRVQAUEE-SLPGGIOYSA-N aldehydo-D-glucose Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C=O GZCGUPFRVQAUEE-SLPGGIOYSA-N 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 3
- 239000000498 cooling water Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000000178 monomer Substances 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 229910052987 metal hydride Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Images
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Battery Mounting, Suspending (AREA)
Abstract
The utility model provides a nonaqueous electrolyte secondary battery. The nonaqueous electrolyte secondary battery includes a plurality of battery cells containing a nonaqueous electrolyte, the plurality of battery cells are arranged in a line in a predetermined direction, side surfaces of adjacent battery cells are bonded together by a first adhesive layer and a second adhesive layer, the side surfaces of the battery cells are divided into a first region and a second region, the first adhesive layer is located in the first region, the second adhesive layer is located in the second region, and stress applied to the second region by the second adhesive layer during charge and discharge is smaller than stress applied to the first region by the first adhesive layer. With this structure, it is possible to prevent a decrease in high-rate charge/discharge performance, suppress an increase in internal resistance of the battery cell, and avoid lithium deposition.
Description
Technical Field
The utility model relates to a nonaqueous electrolyte secondary battery.
Background
Conventionally, a nonaqueous electrolyte secondary battery is configured such that a plurality of battery cells containing a nonaqueous electrolyte are arranged in a row in a predetermined direction, a resin plate is interposed between adjacent battery cells, and the entire battery cell row is bound by a pair of binding plates disposed on the outer side of the battery cell row. The advantage of this structure is that each resin plate can well adapt to the expansion and contraction of each battery cell during the charge and discharge process.
However, in the above-described nonaqueous electrolyte secondary battery, in order to have good conformability of the resin plates, each resin plate needs to have a sufficient thickness (thickness in the cell arrangement direction), resulting in an increase in volume of the nonaqueous electrolyte secondary battery.
In contrast, a structure has been proposed in which an adhesive is applied to the side surfaces (surfaces perpendicular to the direction in which the battery cells are arranged) of the battery cells instead of the resin plate, and the battery cells are fixedly joined to each other with the adhesive. The structure using the binder enables the nonaqueous electrolyte secondary battery to be miniaturized compared to the structure using the resin plate.
However, the structure using the adhesive has the following problems. That is, when the adhesive is uniformly applied to the entire side surfaces of the battery cells to firmly bond the battery cells to each other, the entire side surfaces of the battery cells are pressed by the adhesive when the battery cells expand or contract due to charge and discharge of the battery. On the other hand, in a state where the entire side surface of the battery cell is subjected to a large load, the cycle state of the nonaqueous electrolyte in the battery cell is deteriorated, and in this case, if the high-speed large-current charge and discharge is repeated, the high-speed charge and discharge performance is deteriorated, and the performance of the battery is lowered. On the other hand, when the side surface of the battery cell is pressed by a predetermined pressure or more, the internal resistance in the battery cell becomes uneven, and lithium (Li) is likely to be deposited.
SUMMERY OF THE UTILITY MODEL
In order to solve the above-described problems, an object of the present invention is to provide a nonaqueous electrolyte secondary battery in which a plurality of battery cells are joined together by a binder without lowering high-rate charge/discharge performance and in which lithium deposition can be prevented.
As a technical solution to solve the above technical problem, the utility model provides a nonaqueous electrolyte secondary battery, this nonaqueous electrolyte secondary battery include a plurality of battery monomer that hold nonaqueous electrolyte, its characterized in that: the plurality of battery cells are arranged in a line in a predetermined direction, side surfaces of the adjacent battery cells are bonded together by a first adhesive layer and a second adhesive layer, the side surfaces of the battery cells are divided into a first region and a second region, the first adhesive layer is located in the first region, the second adhesive layer is located in the second region, and stress applied to the second region by the second adhesive layer during charge and discharge is smaller than stress applied to the first region by the first adhesive layer.
The utility model discloses an above-mentioned nonaqueous electrolyte secondary battery's advantage lies in, because the second bond line is exerted in the stress that the second region was regional when charging and discharging and is less than the stress that first bond line was exerted in the first region, so the first region of battery monomer side and the pressure load that the second region bore are uneven to can promote the circulation of the interior nonaqueous electrolyte of battery monomer when the low temperature, its result, can prevent that high-speed charge and discharge performance reduces, restrain the increase of the free internal resistance of battery, avoid lithium to appear.
In the nonaqueous electrolyte secondary battery of the present invention, the second adhesive layer may have a thermal expansion coefficient higher than that of the first adhesive layer. Based on this structure, the second adhesive layer expands or contracts to a greater extent when the battery cell expands or contracts relative to the first adhesive layer, and thus the stress applied to the second region by the second adhesive layer during charge and discharge is smaller than the stress applied to the first region by the first adhesive layer.
In the nonaqueous electrolyte secondary battery of the present invention, the first adhesive layer and the second adhesive layer may be made of the same adhesive material, the first adhesive layer may cover the entire area of the first region, and the second adhesive layer may cover only a partial area of the second region. In this case, it is preferable that the second adhesive layer covers the second region at a prescribed interval in the transverse or longitudinal direction. Based on the structure, the stress applied to the second area by the second adhesive layer during charging and discharging is smaller than the stress applied to the first area by the first adhesive layer, because the second adhesive layer covers only a partial area of the second area, and the first adhesive layer covers the whole area of the first area.
In the nonaqueous electrolyte secondary battery of the present invention, it is preferable that the first region is an upper region of a side surface of the battery cell, and the second region is a lower region of the side surface of the battery cell. With this configuration, the stress applied to the lower region of the side surface of the battery cell by the second adhesive layer during charge and discharge is smaller than the stress applied to the upper region of the side surface of the battery cell by the first adhesive layer, so that the cycle of the nonaqueous electrolyte in the battery cell at low temperature is facilitated, and the decrease in the high-rate charge and discharge performance can be more effectively prevented, the increase in the internal resistance of the battery cell can be suppressed, and the precipitation of lithium can be avoided.
In the nonaqueous electrolyte secondary battery of the present invention, the first region may be a lower region of a side surface of the battery cell, and the second region may be an upper region of the side surface of the battery cell. With this configuration, the stress applied to the upper region of the side surface of the battery cell by the second adhesive layer during charge and discharge is smaller than the stress applied to the lower region of the side surface of the battery cell by the first adhesive layer, and thus the cycle of the nonaqueous electrolyte in the battery cell at low temperature is improved, and it is possible to prevent the high-rate charge and discharge performance from being lowered, suppress the increase in the internal resistance of the battery cell, and avoid lithium deposition.
Drawings
Fig. 1 is a plan view showing a nonaqueous electrolyte secondary battery according to a first embodiment of the present invention.
Fig. 2 is a front view of the nonaqueous electrolyte secondary battery.
Fig. 3 is a side view showing a state where the side surfaces of the battery cells of the nonaqueous electrolyte secondary battery are covered with the first adhesive layer and the second adhesive layer.
Fig. 4 is a graph showing the change characteristics of the increase rate of the internal resistance of the battery cell when the nonaqueous electrolyte secondary battery described above and the nonaqueous electrolyte secondary battery of the comparative example are repeatedly charged and discharged.
Fig. 5 is a side view showing a state where gas generated in the battery cell of the nonaqueous electrolyte secondary battery is discharged to the outside.
Fig. 6 is a side view showing a state in which the side surfaces of the battery cells of the nonaqueous electrolyte secondary battery according to the second embodiment of the present invention are covered with the first adhesive layer and the second adhesive layer.
Fig. 7 is a diagram showing the rate of increase in internal resistance of each cell of the nonaqueous electrolyte secondary battery of the first embodiment, the nonaqueous electrolyte secondary battery of the second embodiment, and the nonaqueous electrolyte secondary battery of the comparative example.
Fig. 8 is a side view showing a state where the side surfaces of the battery cells of the nonaqueous electrolyte secondary battery of the third embodiment are covered with the first adhesive layer and the second adhesive layer made of the same adhesive material.
Detailed Description
Hereinafter, a nonaqueous electrolyte secondary battery according to various embodiments of the present invention will be described with reference to the drawings.
< first embodiment >
Fig. 1 is a plan view showing a nonaqueous electrolyte secondary battery according to a first embodiment of the present invention, fig. 2 is a front view of the nonaqueous electrolyte secondary battery, and fig. 3 is a side view showing a state in which a side surface of a battery cell of the nonaqueous electrolyte secondary battery is covered with a first adhesive layer and a second adhesive layer.
The nonaqueous electrolyte secondary battery 1 shown in fig. 1 to 3 is a vehicle-mounted secondary battery, and is, for example, a secondary battery such as a lithium ion secondary battery or a nickel metal hydride battery. The term "secondary battery" refers to a battery that can be repeatedly charged and discharged.
The nonaqueous electrolyte secondary battery 1 (hereinafter also simply referred to as the secondary battery 1) includes a plurality of (four in the present embodiment) battery cells 10 having the same shape. These battery cells 10 are aligned in a row along a predetermined direction (lateral direction in fig. 1), and side surfaces (surfaces having the widest width) of the adjacent battery cells 10 face each other.
Each battery cell 10 includes an electrode assembly 15 (see fig. 2) in which a positive electrode and a negative electrode are laminated with a separator interposed therebetween, and a battery case 20 in which the electrode assembly 15 and a nonaqueous electrolyte are housed. The electrode body 15 is a flat-shaped coiled electrode body. The battery case 20 has a shape (for example, a box shape) capable of housing the flat coiled electrode assembly 15.
The top surface of the battery case 20 is provided with a positive electrode terminal 21 electrically connected to the positive electrode of the electrode assembly 15, and a negative electrode terminal 22 electrically connected to the negative electrode of the electrode assembly 15. The plurality of battery cells 10 are arranged in a state in which the positive terminals 21 and the negative terminals 22 are alternately arranged. That is, the arrangement directions (positions of the positive and negative electrode terminals) of the two adjacent battery cells 10 are opposite to each other, and the positive electrode terminal 21 of one battery cell 10 and the negative electrode terminal 22 are electrically connected to each other by a connecting member (not shown). In this way, the battery cells 10 are connected in series to form the secondary battery 1 having a desired output voltage.
The side surfaces (surfaces parallel to the widest width surface of the wound electrode body 15) of the battery case 20 of each of the plurality of battery cells 10 are parallel to each other, and the side surfaces of the adjacent battery cells 10 are joined to each other by an adhesive layer. Hereinafter, a structure in which the battery cells 10 are joined to each other by the adhesive layer will be described in detail.
As shown in fig. 1 to 3, a positive electrode terminal 21 and a negative electrode terminal 22 are provided on the top surface of each battery cell 10, and the side surface of each battery cell 10 is divided into an upper region (first region) 10u located at the upper portion (in the direction of gravity) and a lower region (second region) 10d located at the lower portion (in the direction of gravity). The upper region 10u is covered by a first adhesive layer 30 and the lower region 10d is covered by a second adhesive layer 31. That is, the side surfaces of the battery case 20 of the two adjacent battery cells 10 are bonded to each other and joined together by the first adhesive layer 30 covering the upper region 10u and the second adhesive layer 31 covering the lower region 10 d.
In the present embodiment, the upper region 10u occupies the upper half of the side surface of the battery cell 10, and the lower region 10d occupies the lower half of the side surface of the battery cell 10. However, the area ratio of the upper region 10u to the lower region 10d is not limited and may be determined as the case may be.
The first adhesive layer 30 is made of an adhesive material having a thermal expansion coefficient smaller than a predetermined value, and the second adhesive layer 31 is made of an adhesive material having a thermal expansion coefficient larger than that of the first adhesive layer 30. In the present embodiment, the first adhesive layer 30 is made of an adhesive material made of urea resin, for exampleThe second adhesive layer 31 is made of, for example, an adhesive material made of a mixture of urea resin and low-density polypropylene. Specifically, the binder material constituting the second adhesive layer 31 is prepared by sufficiently mixing low-density polypropylene (PP) powder having a high thermal expansion coefficient and urea-formaldehyde resin (UF) powder having a low thermal expansion coefficient. Here, the low-density polypropylene powder has a linear expansion coefficient of 110X 10-6℃-1The linear expansion coefficient of urea-formaldehyde resin powder is 27X 10-6℃-1It can be seen that the two differ by a factor of approximately 5. However, the first adhesive layer 30 and the second adhesive layer 31 may be made of other adhesive materials as long as the thermal expansion coefficient of the second adhesive layer 31 is larger than that of the first adhesive layer 30.
In addition, when the secondary battery 1 is cooled by air and further enhanced cooling is desired, a cooling water passage may be additionally provided in the bottom of the secondary battery 1, and the entire secondary battery 1 may be cooled by cooling water flowing through the cooling water passage.
Therefore, in the present embodiment, the entire upper region 10u of the side surface of each battery cell 10 is covered with the first adhesive layer 30 having a small thermal expansion coefficient, and the entire lower region 10d is covered with the second adhesive layer 31 having a large thermal expansion coefficient, so that the magnitude of expansion or contraction of the first adhesive layer 30 in the upper region 10u is different from the magnitude of expansion or contraction of the second adhesive layer 31 in the lower region 10, the former being small, and the latter being large. This effectively prevents the high-rate charge/discharge performance of the secondary battery 1 from being degraded at low temperatures. Specifically, during the charge and discharge of the secondary battery 1, the second adhesive layer 31 having a large thermal expansion coefficient in the lower region 10d of the side surface of the battery cell 10 expands or contracts to a large extent as the side surface of the battery cell 10 expands or contracts, and therefore the stress applied to the lower region 10d (i.e., the force that restricts the expansion or contraction of the lower region 10 d) is smaller than the stress applied to the upper region 10u by the first adhesive layer 30 (i.e., the force that restricts the expansion or contraction of the upper region 10 u). Since the loads (pressures) applied to the side surfaces of the battery cells 10 are not balanced, the nonaqueous electrolyte in each battery cell 10 can more easily enter (enter and exit) the electrode assembly 15, that is, the circulation state of the nonaqueous electrolyte is improved (particularly, the circulation state at low temperature is improved). As a result, the increase in internal resistance of the secondary battery 1 can be effectively suppressed, and the deterioration of high-rate charge/discharge performance can be prevented.
Fig. 4 is a characteristic diagram showing a relationship between the number of times of overcharge (cyc) and a measured value of the increase rate of the internal resistance of the secondary battery 1 when the vehicle repeats charge and discharge of the secondary battery 1 (overcharged state) in a predetermined travel mode. The measurement of the properties is carried out in a predetermined low temperature environment (for example, -10 ℃). In this measurement, a configuration in which the entire side surface of the battery cell 10 is covered with the first adhesive layer 30 based on the internal resistance (internal resistance increase rate of 1) at the start of the measurement is used as a comparative example. As shown in fig. 4, the measurement result of the comparative example is that the increase rate of the internal resistance sharply increases as the number of times of overcharge increases, whereas the measurement result of the configuration of the present embodiment is that the increase rate of the internal resistance gradually increases as the number of times of overcharge increases. As can be seen from this, with the structure of the present embodiment, a decrease in high-rate charge and discharge performance can be effectively prevented.
On the other hand, if the lower region 10d of the side surface of the battery cell 10 is not covered with the second adhesive layer 31, gas generated by decomposition of the nonaqueous electrolyte tends to accumulate in the portion of the electrode assembly 15 located in the lower region 10d, and the accumulated gas forms bubbles in the nonaqueous electrolyte, which cause local increase in internal resistance or lithium deposition. In contrast, in the present embodiment, since the entire lower region 10d of the side surface of the battery cell 10 is covered with the second adhesive layer 31, the lower region 10d can be kept under a constant pressure at normal temperature. Therefore, as shown in fig. 5, even if gas G is generated in the lower region 10d of the side surface of the battery cell 10, the gas G does not stay in the electrode body 15, but is pressed and discharged from the inside of the electrode body 15 to the outside. That is, as indicated by arrows in fig. 5, the gas G permeates a sealing portion (not shown) provided on the inner wall of the battery case 10 and is discharged to the outside through the electrode (the positive electrode terminal 21 in fig. 5). Therefore, with the structure of the present embodiment, local increase in internal resistance and lithium deposition can be effectively suppressed.
< second embodiment >
Fig. 6 is a side view showing a state in which the side surface of the battery cell 10 of the nonaqueous electrolyte secondary battery according to the second embodiment of the present invention is covered with the adhesive layers (30, 31). In contrast to the first embodiment, in the present embodiment, the upper region 10u of the side surface of the battery cell 10 is covered with the second adhesive layer 31 having a large thermal expansion coefficient, and the lower region 10d is covered with the second adhesive layer 30 having a small thermal expansion coefficient. Here, the first adhesive layer 30 is made of, for example, an adhesive material made of urea resin, and the second adhesive layer 31 is made of, for example, an adhesive material made of a mixture of urea resin and low-density polypropylene, but the first adhesive layer 30 and the second adhesive layer 31 may be made of other adhesive materials as long as the thermal expansion coefficient of the second adhesive layer 31 is larger than that of the first adhesive layer 30.
With the structure of the present embodiment, as in the first embodiment, since the loads applied to the side surfaces of the battery cell 10 are not balanced, the cycle state of the nonaqueous electrolyte in the battery cell 10 (particularly, the cycle state at low temperature) can be improved, and the deterioration of the high-rate charge/discharge performance can be prevented, and the gas accumulated in the battery cell 10 can be discharged to the outside from the battery case 20, so that the precipitation of lithium can be effectively prevented.
Fig. 7 is a graph showing the measurement results of the increase rate of the internal resistance of each of the battery cells in the first embodiment, the second embodiment, and the comparative example. The measurement was carried out at a low temperature of-10 ℃ as the ambient temperature. As is apparent from fig. 7, when the internal resistance increase rate of the comparative example (the entire side surface of the battery cell 10 is covered with the first adhesive layer 30 made of the same adhesive material) is 1.0, the internal resistance increase rate of the secondary battery 1 of the first embodiment is about 0.6, and the internal resistance increase rate of the secondary battery 1 of the second embodiment is about 0.85. From the results, it is understood that the rate of increase in the internal resistance of the battery cell 1 of the first embodiment is lower than that of the second embodiment. This is because, in the battery cell 10 of the secondary battery 1, the amount of the nonaqueous electrolyte that enters and exits the electrode assembly 15 in the lower region 10d is larger than that in the upper region 10u, and therefore, as in the first embodiment, the lower region 10d on the side surface of the battery cell 10 is covered with an adhesive layer having a large thermal expansion to reduce the pressure applied to the lower region 10d, thereby promoting the circulation of the nonaqueous electrolyte in the battery case 20 at low temperatures, allowing the nonaqueous electrolyte to more easily pass through the electrode assembly 15, and suppressing an increase in internal resistance. Therefore, the first embodiment can more effectively prevent the high-rate charge and discharge performance of the secondary battery 1 from being lowered than the second embodiment.
< third embodiment >
Fig. 8 is a side view showing a state in which the side surface of the battery cell 10 of the nonaqueous electrolyte secondary battery according to the third embodiment of the present invention is covered with the adhesive layers (30, 31). Unlike the first and second embodiments, in the present embodiment, the first adhesive agent 30 and the second adhesive layer 31 covering the side surfaces of the battery cell 10 are formed of the same adhesive material, for example, an adhesive material made of urea resin, or an adhesive material made of a mixture of urea resin and low-density polypropylene, or may be formed of another adhesive material.
Specifically, as shown in fig. 8, the first adhesive layer 30 covers the entire area of the upper area 10u of the side surface of the battery cell 10, and the second adhesive layer 31 covers only a partial area in the lower area 10d of the side surface of the battery cell 10. That is, the second adhesive layer 31 covers the lower region 10d at a predetermined interval in the lateral direction.
In the present embodiment, the first adhesive layer 30 and the second adhesive layer 31 covering the side surfaces of the battery cell 10 are made of the same adhesive material, but the second adhesive layer 31 covers only a partial region of the side surfaces of the battery cell 10 in the lower region 10d, and therefore, the stress applied to the lower region 10d by the second adhesive layer 31 during charge and discharge is smaller than the stress applied to the upper region 10u by the first adhesive layer 30.
Therefore, with the configuration of the present embodiment, as in the first and second embodiments described above, since the loads applied to the side surfaces of the battery cell 10 are not balanced in the vertical direction, the cycle state (particularly, the cycle state at low temperatures) of the nonaqueous electrolyte in the battery cell 10 can be improved, and a decrease in the high-rate charge/discharge performance can be effectively prevented, and the gas accumulated in the battery cell 10 can be discharged to the outside from the battery case 20, so that lithium deposition can be effectively prevented.
In addition, in the present embodiment, fig. 8 shows an example in which the second adhesive layer 31 covers the lower region 10d of the battery cell 10 with a predetermined interval in the lateral direction, but the present invention is not limited to this, and the second adhesive layer 31 may cover the lower region of the battery cell with a predetermined interval in the longitudinal direction, or the second adhesive layer 31 may cover the lower region of the battery cell with a predetermined pattern as long as it does not cover the entire region of the lower region of the battery cell.
In addition, in the present embodiment, the first adhesive layer 30 covers the entire area of the upper region 10u of the side surface of the battery cell 10, and the second adhesive layer 31 covers the partial region of the lower region 10d of the side surface of the battery cell 10, but the present invention is not limited thereto. A structure may also be employed in which the first adhesive layer 30 covers a partial area in the upper area 10u of the side surface of the battery cell 10, and the second adhesive layer 31 covers the entire area of the lower area 10d of the side surface of the battery cell 10.
In each of the above embodiments, the number of the battery cells 10 is 4, but may be 3 or 5 or more.
Claims (6)
1. A nonaqueous electrolyte secondary battery comprising a plurality of battery cells containing nonaqueous electrolytes, characterized in that:
the plurality of battery cells are arranged in a row along a specified direction, the side surfaces of the adjacent battery cells are bonded together through a first adhesive layer and a second adhesive layer,
the side surface of the battery cell is divided into a first region and a second region, the first adhesive layer is located in the first region, the second adhesive layer is located in the second region,
the stress applied to the second region by the second adhesive layer during charging and discharging is smaller than the stress applied to the first region by the first adhesive layer.
2. The nonaqueous electrolyte secondary battery according to claim 1, characterized in that:
the second adhesive layer has a thermal expansion coefficient greater than that of the first adhesive layer.
3. The nonaqueous electrolyte secondary battery according to claim 1, characterized in that:
the first adhesive layer and the second adhesive layer are composed of the same adhesive material, the first adhesive layer covers the entire area of the first region, and the second adhesive layer covers only a partial area in the second region.
4. The nonaqueous electrolyte secondary battery according to claim 3, characterized in that:
the second adhesive layer covers the second region at a prescribed interval in the transverse or longitudinal direction.
5. The nonaqueous electrolyte secondary battery according to any one of claims 1 to 4, characterized in that:
the first region is an upper region of a side surface of the battery cell, and the second region is a lower region of the side surface of the battery cell.
6. The nonaqueous electrolyte secondary battery according to any one of claims 1 to 4, characterized in that:
the first region is a lower region of a side surface of the battery cell, and the second region is an upper region of the side surface of the battery cell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921084888.6U CN210129534U (en) | 2019-07-11 | 2019-07-11 | Nonaqueous electrolyte secondary battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921084888.6U CN210129534U (en) | 2019-07-11 | 2019-07-11 | Nonaqueous electrolyte secondary battery |
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| CN210129534U true CN210129534U (en) | 2020-03-06 |
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