Battery system

Abstract

The present invention provides a battery system that can more effectively exchange heat generated in a battery cell group compared to conventional methods, or that can more effectively exchange heat in a battery cell group under low-temperature charging conditions compared to conventional methods. [Solution] A battery system comprising a plurality of batteries having outer casings, the batteries being connected in series or parallel by contacting each other through their outer casings, wherein the battery system comprises a heat exchanger as a case component included in the outer casing of the battery system, and a connecting plate for electrically connecting the electrode terminals of each battery, the connecting plate being thermally coupled to the heat exchanger.

Description

【Technical Field】 【0001】 The present invention relates to heat exchange in a battery system in which a plurality of batteries having exterior cans are connected in series or in parallel by contacting each other through their exterior cans. 【Background Art】 【0002】 With the increasing awareness of environmental protection, large-scale power storage systems using modularized batteries (cells) have been attracting attention. In power storage systems for electric vehicles and energy storage, it is not uncommon to connect more than 100 cells. In such a system, secondary batteries such as lithium-ion batteries are used, for example. In such a large-capacity and high-voltage power storage system (also referred to as a battery system or a cell system), it is often operated at a high output, and heat is generated inside the cell. Therefore, temperature control of the entire battery system is important for safe and efficient charge and discharge. In a stationary power storage system, there are many cases where it does not have a function of actively cooling the battery system. However, in electric vehicles, the number of examples in which an air-cooling or a cooling system using a refrigerant is incorporated is increasing. 【0003】 In order to increase the energy density, the cell groups are arranged closely. Therefore, a cell sandwiched between two cells, particularly a cell near the center of a cell group connected in series or in parallel, is in a severe heat dissipation state. In order to improve such a situation, a cooling path using a refrigerant or the like may be installed around the cell. Patent Document 1 discloses a conventional assembled battery having a cooling path 15 at the lower part of the cell group. This improves the cooling effect, but there are also disadvantages that the mechanism becomes complicated, resulting in an increase in cost and being disadvantageous in terms of energy density. Particularly, when combining battery modules into a pack, it is not easy to keep the resistance of the flow path uniform while preventing the leakage of the refrigerant. 【Prior Art Documents】 【Patent Documents】 【0004】 [Patent Document 1] Japanese Patent Publication No. 2007-280854 [Overview of the Initiative] [Problems that the invention aims to solve] 【0005】 When many cells are grouped together, securing cooling or heat dissipation paths becomes difficult, and heat generation problems can become apparent even at charge / discharge current values ​​that were not a problem at the individual cell level. Increasing the gaps between cells reduces the energy density of the system itself, leading to increased costs. 【0006】 Especially in electric vehicles, the operating environment is more demanding than that of stationary energy storage systems, making heat dissipation countermeasures even more crucial. Therefore, cooling systems utilizing refrigerants such as air and water have emerged, and methods for cooling the cell body itself are being explored. While water cooling systems are more complex, they have been put into practical use and have shown some effectiveness. 【0007】 However, as cells become larger (higher capacity), the time lag between the reaction heat inside the cell and its transfer to the outside increases. Pouch cells using laminate material have reduced heat conduction to the outside, such as the outer casing, due to the resin layer, and even in the case of large prismatic batteries, the outer casing and the electrode body are insulated, so heat conduction to the outer casing is not always good. 【0008】 On the other hand, when high currents are applied, the terminals that serve as the electrodes of the cell generate significant heat. Furthermore, the increased size and multi-tab design within the cell increase heat conduction to the terminals, making it less than ideal to cool the outer casing. Additionally, resin insulators are often used to isolate the terminals from the case, but high temperatures at the terminals can adversely affect these resins, potentially leading to a decrease in long-term reliability. 【0009】 While the above explanation has focused on cooling during cell overheating, i.e., when the cell temperature rises, low-temperature charging in cold regions is also beginning to attract attention as a challenge, and measures to prevent the overheating of the cell group are becoming indispensable. 【0010】 Therefore, the present invention aims to provide a battery system that can more effectively exchange heat generated in a battery cell group compared to conventional systems, or that can more effectively exchange heat in a battery cell group under low-temperature charging conditions compared to conventional systems, in order to address the conventional problems described above. [Means for solving the problem] 【0011】 As a result of various studies, the inventors have found that the above objective can be achieved by the present invention described below. 【0012】 In other words, the battery system according to the present invention is A battery system comprising multiple batteries, each having an outer casing, connected in series or parallel by contacting each other through their respective outer casings, A heat exchanger panel as a case component included in the outer casing of the battery system, It includes a connecting plate that electrically connects the electrode terminals of each battery, The aforementioned connecting plate is thermally coupled to the aforementioned heat exchange plate. Furthermore, as already mentioned, the battery systems described above and below can be applied not only to cooling when cells overheat, i.e., when the cell temperature rises, but also to heating the cell group, such as during low-temperature charging in cold regions. 【0013】 According to the battery system of the present invention, batteries are connected in series or parallel by contacting each other through their outer casings, and the connecting plate is thermally coupled to the collective heat exchange plate. In this case, thermal coupling is performed via, for example, electrically insulated battery casings. With this configuration, heat generated inside the cells can be effectively conducted from the connecting plate, also called a busbar, which electrically connects the electrode terminals of each battery, to the collective heat exchange plate. Furthermore, heat can be conducted from the collective heat exchange plate to the connecting plate, effectively heating the inside of the cells from the connecting plate. Therefore, heat generated in a battery cell group composed of multiple batteries having outer casings can be exchanged more effectively than in the conventional method, or heat can be exchanged more effectively than in the conventional method when heating a battery cell group under low-temperature charging conditions. 【0014】 At least one of the case components included in the outer case has a heat dissipation protrusion on at least one of its surfaces, The connecting plate may be thermally coupled to the heat exchanger via one of its surfaces. "At least one of the case components" may include, for example, the heat exchanger as a case component. With this structure, when there are multiple protrusions, the grooves between the protrusions can also serve as cooling passages, thus contributing to the effective transfer of heat generated inside the cell from the connecting plate, which is thermally coupled via, for example, an electrically insulated battery casing, to the heat exchanger. Furthermore, heat can be transferred from the heat exchanger to the connecting plate, contributing to the effective heating of the inside of the cell from the connecting plate. 【0015】 Equipped with a heat pipe, One end of the heat pipe is in contact with the aforementioned connecting plate. The heat pipe may be sealed with a refrigerant or heat transfer medium. As a result, heat conduction to the heat pipe in contact with the connecting plate [during cooling] or heat conduction from the heat pipe in contact with the connecting plate [during heating] contributes to the effective transfer of heat generated inside the cell from the connecting plate to the heat pipe. Furthermore, heat is conducted from the heat pipe through the connecting plate to the inside of the cell, allowing the connecting plate to effectively heat the inside of the cell. Furthermore, in the above configuration, a blower duct may be in contact with the other end of the heat pipe. As a result, heat conduction to the air duct in contact with the heat pipe [during cooling] or heat conduction from the air duct in contact with the heat pipe [during heating] contributes to the effective transfer of heat generated inside the cell from the connecting plate to the heat pipe and the air duct. In addition, heat is conducted from the heat pipe and the air duct to the inside of the cell via the connecting plate, allowing the inside of the cell to be effectively heated from the connecting plate. 【0016】 Equipped with a Peltier element, The Peltier element is in contact with the aforementioned connecting plate. The Peltier element may be thermally coupled to other components of the battery system. "Other components of the battery system other than the Peltier element" includes case components such as a heat exchanger. As a result, heat conduction to the Peltier element [during cooling] or heat conduction from the Peltier element [during heating] contributes to the effective transfer of heat generated inside the cell from the connecting plate to the Peltier element. Furthermore, heat is conducted from the Peltier element to the inside of the cell via the connecting plate, allowing the connecting plate to effectively heat the inside of the cell. 【0017】 Equipped with a heat-conducting ribbon, One end of the heat-conducting ribbon is in contact with the connecting plate. The heat-conducting ribbon may be thermally coupled to the collective heat exchange plate at the other end. In this case, the heat pipe, the air duct, and / or the Peltier element having the above-described configuration may be combined and provided. Thereby, heat conduction to the heat-conducting ribbon brought into contact with the connecting connection plate or heat conduction from the heat-conducting ribbon brought into contact with the connecting connection plate contributes, so that heat such as heat generated inside the cell can be more effectively heat-conducted from the connecting connection plate to the collective heat exchange plate through the heat-conducting ribbon. Also, heat conduction is performed from the collective heat exchange plate to the inside of the cell through the connecting connection plate with the heat-conducting ribbon interposed therebetween, and the inside of the cell and the like can be effectively heated from the connecting connection plate. 【0018】 The collective heat exchange plate may be cooled or heated by a gas or a liquid under control. Thereby, since the collective heat exchange plate is cooled or heated by a gas or a liquid, heat such as heat generated inside the cell can be more effectively heat-conducted from the connecting connection plate to the collective heat exchange plate. Also, heat conduction is performed from the collective heat exchange plate to the connecting connection plate, and the inside of the cell and the like can be effectively heated from the connecting connection plate. 【Advantages of the Invention】 【0019】 The battery system according to the present invention can effectively perform heat exchange of heat generation in the battery cell group as compared with the conventional case, or can effectively perform heat exchange in heating the battery cell group under low-temperature charging conditions as compared with the conventional case. 【Brief Description of the Drawings】 【0020】 [Figure 1] It is a schematic perspective view showing an example of the appearance of a single battery cell. [Figure 2] It is a schematic perspective view showing an example of a bottom plate that can be used in a battery system. [Figure 3] It is a schematic perspective view showing an example of the appearance of a battery system using a plurality of the above-described battery cells. [Figure 4]Figures (A) and (B) show a schematic plan view and a schematic side view of an example in which a cooling jacket is wrapped around the outer periphery of the above battery system. [Figure 5] These are schematic plan view (Figure (A)) and schematic side view (Figure (B)) showing an example in which a heat-conducting ribbon is used in a battery system using multiple battery cells according to one embodiment of the present invention. [Figure 6] Figures (A) and (B) show a schematic plan view and a schematic side view illustrating an example in which heat pipes and air ducts are used in the above battery system. [Figure 7] Figure 6 shows a schematic plan view (Figure (A)) and a schematic side view (Figure (B)) illustrating an example in which a Peltier element is further used in the battery system shown in Figure 6. [Modes for carrying out the invention] 【0021】 The embodiments of the present invention will be described below with reference to the drawings, but the present invention is applicable to these embodiments. It is not limited to that. 【0022】 Figure 1 shows an external view of a single battery (hereinafter also referred to as a cell) according to one embodiment of the present invention. Figure 3 shows an external view of a battery system using multiple batteries according to the same embodiment, with the outer casing omitted. In this embodiment, a lithium-ion battery is used as the battery 500. The cell 500 in Figure 1 has a non-polarized outer casing 510, a positive electrode terminal 520, and a negative electrode terminal 530. The positive electrode terminal 520 is insulated from the outer casing 510 by an insulating plate 542, and the negative electrode terminal 530 is insulated from the outer casing 530 by an insulating plate 543 (insulating plates 542 and 543 are collectively referred to as insulating plate 540). The outer casing houses an electrode body, a current collector, a separator, and an electrolyte, etc., which are not shown. In the outer casing containing these, the outer casing and a sealing body (not shown) that closes the opening of the outer casing are sealed by welding such as laser welding, or by mechanical crimping such as riveting. 【0023】 In this embodiment, the battery system 100 in Figure 3 comprises, for example, 10 cells 500, each cell 500 being electrically connected in series by connecting plates (hereinafter also referred to as busbars) 600. In the battery system 100 in the same figure, flat rectangular parallelepiped cells are connected in series by contacting each other through their outer casings, forming one large rectangular parallelepiped. Busbars 670, separate from the busbars 600, are attached to the electrodes at both ends of the series connection. As partially shown in a perspective view in Figure 3, an insulating plate 540 exists between the upper surface of the cell 500 (the surface where the electrodes etc. are located) and the lower surface of the busbar 600 facing the upper surface, and the busbars 600 are attached to the electrodes 520, 530 by bolting, screwing, laser welding, etc. 【0024】 In this embodiment, the battery system 100 is a single large rectangular parallelepiped, and if the side where electrodes and the like are located is considered the upper surface (hereinafter the same), a bottom plate 200, as shown in Figure 2, is attached to the lower surface on the opposite side. This upper surface direction is sometimes referred to as the upper side. This bottom plate 200 is one of the case components included in the outer case (not shown) of the battery system, and is, for example, an aluminum plate, and serves as a collective heat exchange plate for cooling. In this embodiment, the busbar 600 is thermally coupled to the bottom plate 200, and to those skilled in the art, the two are basically directly connected and thermally coupled by a predetermined method, for example, thermal coupling is performed via the outer casing 510 of the electrically insulated cell 500. When thermal coupling, a heat conductive sheet or heat conductive grease may be interposed to ensure a contact area. Unless otherwise specified below, the busbar 600 is thermally coupled to case components such as the bottom plate 200 via an electrically insulated outer casing 510, as described above, thereby enabling heat transfer between them and contributing to the cooling or heating of the cell. 【0025】 In this embodiment, the bottom plate 200, which is one of the case components, has a heat dissipation projection 210 on at least one surface, for example, its upper surface, and the busbar 600 is thermally coupled to the bottom plate 200 via this upper surface. Here, the projection 210 is in contact with the lower surface of the outer casing 510 of the cell 500, and the busbar 600 is thermally coupled to the bottom plate 200 via, for example, the outer casing 510 of the cell 500. If there are multiple projections 210, it is possible to flow gas or liquid through the groove 220 between them, and under predetermined control, the bottom plate 200 and the cell 500 are cooled or heated by the gas or liquid. 【0026】 Here, we will explain the heat generated in cell 500 and the battery system 100. During charging and discharging, cell 500 generates heat due to the internal reaction heat. During high-power charging and discharging, not only is the reaction heat generated by cell 500 itself significant, but the proportion of heat generated by ohmic losses due to the current collectors (not shown) of electrodes 520 and 530 inside cell 500, the current supply paths to electrode terminals 520 and 530, and the busbars 600 and 670 outside the cell becomes very large. In this case, cooling of the cell's outer casing 510 may not be sufficient, and it is thought that more efficient cooling would be possible if the busbars 600 could be actively cooled instead of the cell's outer casing 510. In particular, the cross-sectional area of ​​the conductive material from the electrode group inside cell 500 to terminals 520 and 530 is smaller than other areas, and this part is often a bottleneck. While the current from the electrode group described above must pass through materials with low thermal conductivity, such as separators and electrolytes, to the surface of the outer casing 510, the current collector is made of metal, and its thermal conductivity is significantly superior to these materials. In particular, lithium-ion batteries use aluminum or copper as the current collector material, and the reaction heat generated is highly likely to be dissipated through these materials. 【0027】 However, the shapes of these current collectors and terminals 520, 530, etc., are complex, making it difficult to obtain a heat conduction path (heat transfer path). Therefore, in this embodiment, instead of the outer casing of cell 500 such as the outer can 510, the core bodies of electrodes 520, 530 and the connecting parts such as busbars that connect cells, which are connected not only electrically but also thermally, are actively cooled. The aim is to minimize space loss while performing efficient cooling and suppressing the deterioration of the insulating resin of the terminal parts. In this embodiment, this explanation of cooling can also be applied in the case of heating as needed, from the perspective of heat transfer. 【0028】 For this cooling or heating, electrical energy is required, and the use of Peltier elements or similar devices is conceivable. Using Peltier elements allows for more proactive temperature control, potentially enabling precise control of the parts and times where control is needed, and potentially improving overall energy efficiency compared to simply letting the heat transfer fluid flow freely. These measures are considered particularly effective for pouch cells and prismatic cells employing multilayer electrodes. However, this does not mean that wound electrodes or cylindrical cells are ineffective; their effectiveness can be expected depending on the shape of the busbars. 【0029】 Figures 5 to 7 show three examples of the battery system 100 according to this embodiment. In the battery system 100 shown in Figure 5, for example, the busbar 600 and the bottom plate 200 are thermally coupled via a heat conduction ribbon 300. Specifically, one end of the heat conduction ribbon 300 is in contact with the busbar 600, and the other end is thermally coupled to the bottom plate 200. This configuration ensures that heat conduction to the aluminum plate of the bottom plate is properly maintained. Attention must be paid to electrical insulation between the heat conduction ribbon 300 and the busbar. In the plan view shown in Figure (A) of Figures 4 to 7, the 10 cells 500 are numbered from left to right for convenience. 【0030】 In the battery system 100 shown in Figure 6, for example, a heat pipe 400 with a heat transfer layer on the busbar side is passed above (upper) the busbar 600, and after electrical insulation is provided, one end of the heat pipe 400 is brought into contact with the busbar 600 to achieve thermal coupling. Furthermore, in this embodiment, the opposite end of the heat pipe is in contact with a temperature-controllable air duct DK. The battery system 100 shown in Figure 7 is substantially the same as that in Figure 6, but one difference is that, for example, thin Peltier elements 700 are in contact with the top of nine series-connected busbars 600, excluding the busbars 670 at both ends. On the opposite side, a heat pipe 400 is installed as in Figure 6, and the opposite end of the heat pipe 400 is in contact with the air duct as in Figure 6. [Examples] 【0031】 The following describes a comparative experiment regarding cooling. The cell used is the cell (prismatic battery) 500 shown in Figure 1, in which the positive electrode terminal 520 is made of aluminum alloy and the negative electrode terminal 530 is made of copper-nickel plated metal. The prismatic battery 500 has a capacity of 45 Ah and has an aluminum casing 510 that houses a stacked electrode with bolt-shaped positive electrode terminals 520 and negative electrode terminal 530. The battery system 100 consists of these prismatic batteries 500 connected in one parallel and ten in series as shown in Figure 3, and is equipped with a bottom plate 200. The bottom plate 200 is a 5 mm thick aluminum bottom plate with grooves 220 that are 2 mm wide and 2 mm deep, provided at 2 mm intervals. 【0032】 In this state, an experiment was conducted to compare the difference in temperature rise due to differences in the configuration around the busbars. Thermocouples 800 were installed at seven locations: both ends of the 10 series cell group, the center of the cell side between 5 and 6 (referring to the cell side, between the 5th cell 500 and the 6th cell 500 from the left; the same applies hereafter), the inner surface of the busbar between 1 and 2 (referring to the busbar, between the 1st cell 500 and the 2nd cell 500 from the left; the same applies hereafter), between 5 and 6, and between 9 and 10, and the center of the bottom plate 200. Temperature measurements were taken. 【0033】 Furthermore, evaluation experiments were also conducted using cell 500 alone (Figure 1). In this case, 22SQ IV wire was connected to both terminals 520 and 530 using ring terminals. The experimental specifications for each battery system are described below. 【0034】 <Conventional Example 1.> The cells of the battery system 100 were connected in series using copper busbars (busbar 600) with a thickness of 2 mm, a width of 15 mm, and a length of 55 mm. Terminals 520 and 530 also had the same busbars (busbar 670) attached, and 22SQ-IV wires with ring terminals were connected to the busbars 670 with bolts and nuts. See Figure 3 for the corresponding diagram (the 22SQ-IV wires are not shown in the diagram; the same applies below). 【0035】 <Conventional Example 2.> The busbars connecting the cells are the same as in Conventional Example 1, but a cooling jacket 900 using a refrigerant is installed around the outer circumference of the cells, and the refrigerant temperature at the inlet 910 is controlled to 20°C. The jacket 900 and each cell 500 are thermally coupled with an electrically insulating, thermally conductive silicone resin. In addition to the above, thermocouples 800 were also installed at the outlet 920 and inlet 910 of the jacket 900, and their temperatures were also measured. See Figure 4 for a corresponding diagram. 【0036】 <Example 1 of the present invention.> In Conventional Example 1, a 30mm wide, 0.3mm thick aluminum heat-conducting ribbon 300 was thermally coupled to each busbar 600 with an electrically insulating, highly thermally conductive silicone resin, and connected to the bottom aluminum plate 200 to ensure proper heat conduction. Sufficient attention was paid to electrical insulation between the ribbon 300 and the busbars, and protection was provided with insulating tape or the like as needed. The corresponding diagram is shown in Figure 5. 【0037】 <Example 2 of the present invention.> In Conventional Example 1, a thin heat pipe 400 with a heat transfer layer on the busbar side was passed over the busbar, and after electrical insulation, a thermal coupling was applied. The other end of the heat pipe 400 was drawn into an air duct DK that allows for temperature control of the airflow. The airflow was tested at an ambient temperature (temperature: 25°C) and a wind speed of 5 m / s. In addition to the above, thermocouples 800 were also installed at the outlet DKO and inlet DKI of the duct DK, and their temperatures were also measured. See Figure 6 for a corresponding diagram. 【0038】 <Example 3 of the present invention.> In Conventional Example 1, thin 10W 15mm square Peltier elements 700 were installed on top of nine series-connected busbars 600, excluding the busbars 670 at both ends. A heat pipe 400 was installed on the opposite side, similar to Example 2 of the Invention, and the other end of the heat pipe 400 was drawn into a temperature-controllable air duct DK. The Peltier elements were temperature-controlled so that the busbar temperature was 25±3℃. The airflow was tested at an ambient temperature (temperature: 25℃) with a wind speed of 5m / sec. Similar to Example 2 of the Invention, thermocouples 800 were also installed at the outlet DKO and inlet DKI of the duct DK, and their temperatures were measured. The corresponding diagram is shown in Figure 7. 【0039】 (Evaluation test) Single cells (n=3) and 10-series battery systems from Conventional Examples 1 and 2, and Invention Examples 1-3 were discharged under the following discharge conditions in a 25°C environment, and the temperature during discharge was measured. Note that n represents the number of test samples and is commonly used as the n number among those skilled in the art. Condition A: 0.2CA (9A) 3.0V / cell cutoff Condition B: 0.5CA (22.5A) 3.0V / cell cutoff Condition C: 2CA (90A) x 10 seconds + 0.1CA (4.5A) x 190 seconds, 3.0V / cell cutoff. 【0040】 After the discharge test was completed, the batteries were left in a 25°C environment for more than 10 hours to return to ambient temperature, and then charged at a constant current and constant voltage of 0.2CA (9A) - 4.2V / cell. Charging was terminated when the current decreased to 0.02CA (0.9A). 【0041】 Table 1 shows the discharge capacity of each cell under discharge conditions A to C. The average current under condition C was 0.2CA, but due to the large voltage drop during pulses, the capacity was lower than expected. However, this is not a particular problem and is a general trend. Table 2 shows the maximum temperature reached at each measurement point during the discharge test. In this study, system power consumption, such as power used for cooling, was not included in the comparison; only the maximum temperature reached was used. 【0042】 [Table 1] 【0043】 [Table 2] 【0044】 According to the table, the temperature between points 5 and 6 is the most noteworthy point, and it was found that conducting heat from the busbar 600 described above is more effective than dissipating heat from the surface of the cell's outer casing. At low discharge rates, the temperature did not rise extremely high, and in Invention 3, the operation of the Peltier element was limited due to the operating settings, resulting in a level equivalent to Invention 2. However, sufficient effect was obtained under conditions where the temperature rise was large, suggesting that effective cooling is possible even at high ambient temperatures. 【0045】 Although this test only involved discharge, it is believed to be highly effective during charging, especially during rapid charging. Furthermore, it is thought that heat conduction from the busbar 600 is immediately effective not only for cooling but also for raising the temperature. As mentioned above, we will not discuss the power consumption of the system this time, but for Conventional Example 1 and Invention Example 1, no power is required for thermal management. For the other three examples, Conventional Example 2 requires more power than Invention Example 2, and Invention Example 3 is thought to consume about the same amount of power as Conventional Example 2. Invention Example 3 also requires power for the Peltier element, but Conventional Example 3 also requires a system for refrigerant cooling, and if the temperature control required in Invention Example 3 is finely adjusted, the power consumption can be sufficiently reduced depending on the ingenuity. 【0046】 The present invention is not limited to the embodiments described above, and various additions, modifications, or deletions are possible without departing from the spirit of the invention. Therefore, such additions, modifications, or deletions are also included within the scope of the present invention. [Explanation of symbols] 【0047】 100 Battery System 200 Bottom plate (collective heat exchange plate) 210 Heat dissipation protrusions 220 Groove 300 thermal conductive ribbons 400 Heat Pipe 500 batteries (cells) 510 Outer can 520 Positive electrode (electrode terminal) 530 Negative electrode (electrode terminal) 540, 542, 543 Insulating boards 600, 670 Busbar (connecting plate for linking) 700 Peltier elements 800 Thermocouple 900 Cooling Jacket DK ventilation duct

Claims

[Claim 1] A battery system comprising multiple batteries, each having an outer casing, connected in series or parallel by contacting each other through their respective outer casings, A heat exchanger panel as a case component included in the outer casing of the battery system, It includes a connecting plate that electrically connects the electrode terminals of each battery, The connecting plate is thermally coupled to the heat exchanger plate. Battery system. [Claim 2] In the battery system according to claim 1, At least one of the case components included in the outer case has a heat dissipation protrusion on at least one of its surfaces, The connecting plate is thermally coupled to the heat exchanger plate via this one surface. Battery system. [Claim 3] In the battery system according to claim 1, Equipped with a heat pipe, One end of the heat pipe is in contact with the aforementioned connecting plate. The heat pipe is sealed with a refrigerant or heat transfer medium. Battery system. [Claim 4] In the battery system according to claim 3, The other end of the heat pipe is in contact with an air duct. Battery system. [Claim 5] In the battery system according to claim 1, Equipped with a Peltier element, The Peltier element is in contact with the aforementioned connecting plate. The Peltier element is thermally coupled to other components of the battery system other than the Peltier element itself. Battery system. [Claim 6] In the battery system according to claim 1, Equipped with a heat-conducting ribbon, One end of the heat-conducting ribbon is in contact with the connecting plate. The heat-conducting ribbon is thermally coupled to the heat exchange plate at its other end. Battery system. [Claim 7] In the battery system according to any one of claims 1 to 6, The aforementioned heat exchanger is cooled or heated by gas or liquid under controlled conditions. Battery system.

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