Energy storage device

Abstract

The present invention provides an energy storage device that allows for easy electrical connection between a detection module located at one end of the cell module's arrangement direction and the temperature detection units on both sides, when temperature detection units are provided on both sides in an intersecting direction that intersects the arrangement direction of the energy storage cells. [Solution] The busbar module 30 includes a plurality of busbars 23 located on the X1 side of the module center 3 and a plurality of busbars 33 located on the X2 side of the module center 3. The temperature sensing unit 50 includes a temperature sensor 51 located on the X1 side of the module center 3 and a temperature sensor 52 located on the X2 side of the module center 3. The detection connector 42 is electrically connected to the temperature sensor 51 and is located on the X1 side relative to the module body 41. The detection connector 43 is electrically connected to the temperature sensor 52 and is located on the X2 side relative to the module body 41.

Description

Technical Field

[0001] The present disclosure relates to a power storage device.

Background Art

[0002] Japanese Unexamined Patent Application Publication No. 2024-085194 (Patent Document 1) discloses a secondary battery in which a plurality of battery cells are arranged. The secondary battery includes a bus bar that connects the positive electrodes at one end of each battery cell and the negative electrodes at the other end of each battery cell. A temperature detection unit, which is a sensor for detecting the temperature of the bus bar, is disposed on the bus bar. Signals from the temperature detection units disposed on each bus bar are transmitted through a flexible substrate to a connector provided outside the flexible substrate.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the secondary battery (power storage device) described in Patent Document 1 above, as described above, signals are transmitted from the temperature detection units disposed on the bus bars at both ends of the battery cells (power storage cells) to the connector. For example, when the connector (pin) is arranged to face the one end side, it is considered difficult to electrically connect the temperature detection unit on the other end side and the connector. Specifically, in order to electrically connect the temperature detection unit on the other end side and the connector by means of a flexible substrate, it is necessary to make the flexible substrate wrap around to the one end side. For this reason, it is considered that the secondary battery becomes larger in size.

[0005] This disclosure is made to solve the above problems, and its purpose is to provide an energy storage device that allows for easy electrical connection between a detection module located at one end of the cell module's arrangement direction and the temperature detection units on both sides, when temperature detection units are provided on both sides of an intersecting direction that intersects the arrangement direction of the energy storage cells. [Means for solving the problem]

[0006] A power storage device according to one aspect of the present disclosure includes a cell module containing a plurality of power storage cells arranged in an array direction, a busbar module electrically connected to the cell module, a temperature sensing unit, and at least one detection module electrically connected to the temperature sensing unit and located at one end of the cell module in the array direction. If the direction intersecting the array direction is defined as the intersecting direction, one direction of the intersecting direction as the first direction, and the other direction of the intersecting direction as the second direction, the busbar module includes a plurality of first busbars located in the first direction side of the module center, which is located in the center of the intersecting direction in the cell module, and a plurality of second busbars located in the second direction side of the module center. The temperature sensing unit includes a first temperature sensing unit located in the first direction side of the module center and capable of detecting the temperature of at least one of the plurality of first busbars, and a second temperature sensing unit located in the second direction side of the module center and capable of detecting the temperature of at least one of the plurality of second busbars. The detection module includes a module body and a first detection connector and a second detection connector connected to the module body. The first detection connector is electrically connected to the first temperature sensing unit and is positioned on the first direction side relative to the module body. The second detection connector is electrically connected to the second temperature sensing unit and is positioned on the second direction side relative to the module body. [Effects of the Invention]

[0007] According to this disclosure, when temperature sensing units are provided on both sides in an intersecting direction that intersects the arrangement direction of the energy storage cells, a detection module located on one end of the cell module in the arrangement direction can be easily electrically connected to the temperature sensing units on both sides. [Brief explanation of the drawing]

[0008] [Figure 1] This is a perspective view showing the configuration of the energy storage device according to this embodiment. [Figure 2] This is a plan view showing the detailed configuration of the energy storage device. [Figure 3] Figure 2 is a magnified view of a portion of the cell module and detection module. [Figure 4] Figure 2 is a partially enlarged view showing the configuration near the detection module. [Figure 5] This diagram shows the pinout of the detection connector on the X1 side. [Figure 6] This diagram shows the pinout of the detection connector on the X2 side. [Modes for carrying out the invention]

[0009] Embodiments of this disclosure will be described with reference to the drawings. In the drawings referred to below, the same or equivalent components are given the same number.

[0010] Figure 1 shows the configuration of the energy storage device 100 according to this embodiment. The energy storage device 100 is mounted, for example, on a vehicle (not shown). The vehicle may be a PHEV (Plug-in Hybrid Electric Vehicle), a BEV (Battery Electric Vehicle), or an FCEV (Fuel Cell Electric Vehicle), etc. Note that the application of the energy storage device 100 is not limited to vehicle applications.

[0011] In this specification, the X, Y, and Z directions are mutually orthogonal directions. For example, the X direction may be the longitudinal direction of the vehicle when the energy storage device 100 is mounted on the vehicle. The Y direction may be the lateral direction of the vehicle when the energy storage device 100 is mounted on the vehicle. The Z direction may be the vertical direction when the energy storage device 100 is mounted on the vehicle. For example, the Z1 and Z2 directions may be upward and downward, respectively. Note that the X direction may be the lateral direction and the Y direction may be the longitudinal direction. Furthermore, the X and Y directions are examples of the "intersecting direction" and "arrangement direction" as defined in this disclosure.

[0012] The energy storage device 100 comprises a cell module 10, a busbar module 20, a busbar module 30, and a detection module 40. Each of the busbar modules 20 and 30 is electrically connected to the cell module 10.

[0013] The cell module 10 includes side 1 and side 2. Side 1 is the side of the cell module 10 on the X1 side. Side 2 is the side of the cell module 10 on the X2 side. The X1 side and X2 side are the one direction and the other direction in the X direction, respectively. The X1 direction and X2 direction are examples of the "first direction" and "second direction" in this disclosure, respectively. Also, side 1 and side 2 are examples of the "first side" and "second side" in this disclosure, respectively.

[0014] The busbar module 20 is positioned X1 side of module center 3 (shown as a dashed line in Figure 1), which is located in the center of the cell module 10 in the X direction. The busbar module 30 is positioned X2 side of module center 3.

[0015] The bus bar module 20 includes a printed circuit board 21, two bus bar connectors 22, and a plurality of bus bars 23 (FIG. 2). Note that the printed circuit board 21 and the bus bar connector 22 are each an example of the "first printed circuit board" and the "first bus bar connector" of the present disclosure. Also, the bus bar 23 is an example of the "first bus bar" of the present disclosure.

[0016] The printed circuit board 21 is disposed at a position facing the side surface 1 of the cell module 10. Specifically, the printed circuit board 21 and the side surface 1 face each other in the X direction. Note that each of the printed circuit board 21 and the side surface 1 intersects (is orthogonal to) the X direction.

[0017] One and the other of the two bus bar connectors 22 are disposed at the end on the Y1 side and the end on the Y2 side of the printed circuit board 21, respectively. The bus bar connector 22 on the Y1 side is located on the Y1 side of the end 4 on the Y1 side of the cell module 10. The bus bar connector 22 on the Y2 side is located on the Y2 side of the end 5 on the Y2 side of the cell module 10. Note that each of the ends 4 and 5 is an example of the "one end" of the present disclosure.

[0018] The bus bar module 30 includes a printed circuit board 31, two bus bar connectors 32, and a plurality of bus bars 33 (FIG. 2). Note that the printed circuit board 31 and the bus bar connector 32 are each an example of the "second printed circuit board" and the "second bus bar connector" of the present disclosure. Also, the bus bar 33 is an example of the "second bus bar" of the present disclosure.

[0019] The printed circuit board 31 is disposed at a position facing the side surface 2 of the cell module 10. Specifically, the printed circuit board 31 and the side surface 2 face each other in the X direction. Each of the printed circuit board 31 and the side surface 2 intersects (is orthogonal to) the X direction.

[0020] One of the two busbar connectors 32 and the other are respectively arranged at the end on the Y1 side and the end on the Y2 side of the printed circuit board 31. The busbar connector 32 on the Y1 side is located on the Y1 side of the end 4 of the cell module 10. The busbar connector 32 on the Y2 side is located on the Y2 side of the end 5 of the cell module 10.

[0021] The detection module 40 includes a detection module 40a and a detection module 40b. Each of the detection module 40a and the detection module 40b is electrically connected to each of the busbar module 20 and the busbar module 30. Since the detection module 40a and the detection module 40b have the same configuration, in the following description, when the detection module 40 is described, it is assumed to be a matter common to the detection module 40a and the detection module 40b. In addition, the detection module 40a and the detection module 40b are respectively an example of the "first detection module" and the "second detection module" of the present disclosure.

[0022] The detection module 40a is arranged on the end 4 side of the cell module 10. Specifically, the detection module 40a is arranged on the Y1 side with respect to the end 4. The detection module 40a and the end 4 face each other in the Y direction. The detection module 40b is arranged on the end 5 side of the cell module 10. Specifically, the detection module 40b is arranged on the Y2 side with respect to the end 5. The detection module 40b and the end 5 face each other in the Y direction.

[0023] The detection module 40 includes a module body 41, a detection connector 42, and a detection connector 43. Each of the detection connector 42 and the detection connector 43 is connected to the module body 41. In addition, the detection connector 42 and the detection connector 43 are respectively an example of the "first detection connector" and the "second detection connector" of the present disclosure.

[0024] The detection connector 42 is located on the X1 side relative to the module body 41. The detection connector 43 is located on the X2 side relative to the module body 41. In other words, the module body 41 is located between the detection connector 42 and the detection connector 43 in the X direction.

[0025] The module body 41 is positioned so as to overlap with the cell module 10 in the Y direction. Similarly, the detection connectors 42 and 43 are also positioned so as to overlap with the cell module 10 in the Y direction. Specifically, the detection module 40 is located in the X direction within the range between the position where side 1 and side 2 of the cell module 10 are located. Similarly, the busbar connectors 22 and 32 are also positioned within this range in the X direction.

[0026] This makes it easier to miniaturize the energy storage device 100 compared to the case where the module body 41 (detection module 40) is positioned offset in the X direction relative to the cell module 10.

[0027] The detection connector 42 of the detection module 40 is connected to the busbar connector 22. The detection connector 43 of the detection module 40 is connected to the busbar connector 32.

[0028] Figure 2 is a schematic plan view showing the detailed configuration of the energy storage device 100. The cell module 10 includes a plurality of (50 in this embodiment) energy storage cells 11, a plate 12, and a pair of end plates 13. The plurality of energy storage cells 11 are arranged in the X direction. Note that in Figure 2, in order to illustrate the wiring described later more clearly, the thickness of the printed circuit boards 21 and 31 is shown to be larger than it actually is, and the wiring is shown offset from each other.

[0029] The plate 12 is positioned in the center of the multiple energy storage cells 11. The position in the Y direction where the plate 12 is positioned is denoted as position P. Twenty-five energy storage cells 11 are arranged in each region on the Y1 side and Y2 side of the plate 12. The cell module 10 includes a cell module 10A composed of 25 energy storage cells 11 on the Y1 side of the plate 12, and a cell module 10B composed of 25 energy storage cells 11 on the Y2 side of the plate 12. The plate 12 is formed of, for example, resin. Position P is an example of a "predetermined position" in this disclosure.

[0030] The cell module 10 is sandwiched between a pair of end plates 13. One of the pair of end plates 13 is positioned between the end 4 (Figure 1) of the cell module 10 and the detection module 40a. The other of the pair of end plates 13 is positioned between the end 5 (Figure 1) of the cell module 10 and the detection module 40b.

[0031] Detection module 40a receives signals indicating the temperature and voltage of the energy storage cell 11 of cell module 10A, as described below. Detection module 40b receives signals indicating the temperature and voltage of the energy storage cell 11 of cell module 10B, as described below.

[0032] Figure 3 is a partially enlarged view of Figure 2. As shown in Figure 3, each of the multiple energy storage cells 11 has an electrode terminal 11a and an electrode terminal 11b. One of the electrode terminals 11a and 11b is the positive electrode terminal, and the other of the electrode terminals 11a and 11b is the negative electrode terminal. The electrode terminal 11a is located at one end of each energy storage cell 11 in the X direction. The electrode terminal 11a is located at the other end of each energy storage cell 11 in the X direction.

[0033] Multiple energy storage cells 11 are arranged so that their orientation in the X direction alternates. That is, energy storage cells 11 with electrode terminals 11a on the X1 side and electrode terminals 11b on the X2 side and energy storage cells 11 with electrode terminals 11a on the X2 side and electrode terminals 11b on the X1 side are arranged alternately in the Y direction. The electrode terminals 11a and 11b on the X1 side are located on side 1 of the cell module 10. The electrode terminals 11a and 11b on the X2 side are located on side 2 of the cell module 10.

[0034] Each of the multiple busbars 23 connects the electrode terminal 11a of one of the energy storage cells 11 arranged in the Y direction to the electrode terminal 11b of the other energy storage cell 11. However, only one of the multiple busbars 23 connects the electrode terminals 11a and 11b of two energy storage cells 11 located adjacent to each other in the Y direction of the plate 12. That is, only one of the busbars 23 extends across the plate 12 (see Figure 2). Although Figures 2 and 3 show the busbars 23 positioned closer to the energy storage cells 11 than the printed circuit board 21, the disclosure is not limited to this example. For example, the busbars 23 and the printed circuit board 21 may be positioned so that they overlap in the Z direction. The same may apply to the busbars 33 and the printed circuit board 31.

[0035] Each of the multiple busbars 33 connects the electrode terminal 11a of one of the energy storage cells 11 arranged in the Y direction to the electrode terminal 11b of the other energy storage cell 11.

[0036] Fifty energy storage cells 11, arranged in the Y direction, are electrically connected in series by multiple busbars 23 and multiple busbars 33.

[0037] Referring again to Figure 2, the energy storage device 100 includes a temperature detection unit 50 and a voltage detection unit 60. Each of the temperature detection unit 50 and the voltage detection unit 60 is electrically connected to the detection module 40.

[0038] The temperature detection unit 50 includes at least one temperature sensor 51 and at least one temperature sensor 52. The positions of the temperature sensors 51 and 52 are symmetrical in the Y direction with respect to the plate 12. The temperature sensors 51 and 52 are examples of the "first temperature detection unit" and "second temperature detection unit" of this disclosure, respectively.

[0039] The temperature sensor 51 is located on the X1 side of the module center 3 (Figure 1). Specifically, the temperature sensor 51 is located on some of the multiple busbars 23. More specifically, the temperature sensor 51 is located on the busbar 23 closest to the detection module 40 and on the busbar 23 corresponding to the center of the cell module 10A (cell module 10B) in the Y direction. In other words, the temperature sensor 51 is located on four of the multiple busbars 23. The temperature sensor 51 detects the temperature of the busbar 23 on which it is located.

[0040] The temperature sensor 52 is located on the X2 side of the module center 3 (Figure 1). Specifically, the temperature sensor 52 is located on some of the multiple busbars 33. More precisely, the temperature sensor 52 is located on the busbar 33 that is closest to the plate 12. In other words, two of the multiple busbars 33 are occupied by the temperature sensor 52. The temperature sensor 52 detects the temperature of the busbar 33 on which it is located.

[0041] In conventional energy storage devices, if the detection connector (or its pins) of the detection module is positioned to face, for example, towards X1, it becomes difficult to electrically connect the sensor on the X2 side to the detection connector.

[0042] Therefore, in this embodiment, the detection connector 42 located on the X1 side of the module body 41 is electrically connected to the temperature sensor 51. The detection connector 43 located on the X2 side of the module body 41 is electrically connected to the temperature sensor 52.

[0043] Specifically, the printed circuit board 21 has wiring 24 and wiring 25 formed on it. Wiring 24 electrically connects the temperature sensor 51 and the busbar connector 22. Each of wiring 24 and wiring 25 is a pattern (metal foil, etc.) formed on the printed circuit board 21. In Figure 2, wiring 24 is represented by a dashed line and wiring 25 is represented by a solid line. Wiring 24 is an example of the "first wiring" of this disclosure.

[0044] Furthermore, wiring 34 and wiring 35 are formed on the printed circuit board 31. Wiring 34 electrically connects the temperature sensor 52 and the busbar connector 32. Each of wiring 34 and wiring 35 is a pattern (metal foil, etc.) formed on the printed circuit board 31. In Figure 2, wiring 34 is represented by a dashed line and wiring 35 is represented by a solid line. Note that wiring 34 is an example of the "second wiring" of this disclosure.

[0045] The detection connector 42 of the detection module 40a is electrically connected to a temperature sensor 51 located on the Y1 side of position P where the plate 12 is positioned in the Y direction. The detection connector 43 of the detection module 40a is electrically connected to a temperature sensor 52 located on the Y1 side of position P in the Y direction. The detection connector 42 of the detection module 40b is electrically connected to a temperature sensor 51 located on the Y2 side of position P in the Y direction. The detection connector 43 of the detection module 40b is electrically connected to a temperature sensor 52 located on the Y2 side of position P in the Y direction.

[0046] This allows for easy connection of the temperature sensor and detection connector in both the Y1 and Y2 regions of the cell module 10, and simplifies the wiring structure.

[0047] The voltage detection unit 60 includes a plurality of voltage sensors 61 and a plurality of voltage sensors 62. The voltage sensors 61 are located on each busbar 23. The voltage sensors 62 are located on each busbar 33. The busbar 23 on which the temperature sensor 51 is located also has a voltage sensor 61. The busbar 33 on which the temperature sensor 52 is located also has a voltage sensor 62. Note that the temperature sensor 51 and voltage sensor 61 located on a common busbar 23 may be integrally formed. The temperature sensor 52 and voltage sensor 62 located on a common busbar 33 may also be integrally formed.

[0048] The voltage sensor 61 may detect the voltage of the busbar 23 on which the voltage sensor 61 is located (the voltage difference between the energy storage cells 11 connected by the busbar 23). Alternatively, the voltage sensor 61 may detect the voltage of each of the two energy storage cells 11 connected by the busbar 23. In this respect, the voltage sensor 62 may be the same as the voltage sensor 61.

[0049] The wiring 25 on the printed circuit board 21 electrically connects the voltage sensor 61 and the busbar connector 22. The wiring 35 on the printed circuit board 31 electrically connects the voltage sensor 62 and the busbar connector 32.

[0050] Figure 4 is a schematic diagram showing the detailed configuration of the detection connectors (42, 43) and busbar connectors (22, 32). For simplification, some of the pins described later are omitted in Figure 4.

[0051] The busbar connector 22 has at least one temperature pin 22a and a plurality of voltage pins 22b. In this embodiment, the busbar connector 22 has three temperature pins 22a. Two of the three temperature pins 22a are electrically connected to the wiring 24 (Figure 2).

[0052] The busbar connector 32 has at least one temperature pin 32a and a plurality of voltage pins 32b. In this embodiment, the busbar connector 32 has three temperature pins 32a. One of the three temperature pins 32a is electrically connected to the wiring 34 (Figure 2).

[0053] The detection connector 42 has at least one temperature pin 42a and a plurality of voltage pins 42b. In this embodiment, the detection connector 42 has three temperature pins 42a. The temperature pins 42a are pins for temperature detection, and the voltage pins 42b are pins for voltage detection. Each temperature pin 42a is in contact (electrically connected) with one of the three temperature pins 22a of the busbar connector 22. Each voltage pin 42b is in contact (electrically connected) with one of the plurality of voltage pins 22b of the busbar connector 22. The temperature pins 42a are an example of the "first detection pin" in this disclosure.

[0054] As a result, two of the three temperature pins 42a are electrically connected to the temperature sensor 51 (Figure 2) via wiring 24 (Figure 2) and temperature pin 22a. These two temperature pins 42a receive (acquire) signals indicating the temperature of the busbar 23 (Figure 2) detected by the temperature sensor 51. Each voltage pin 42b is electrically connected to the voltage sensor 61 (Figure 2) via wiring 25 (Figure 2) and voltage pin 22b. These voltage pins 42b receive (acquire) signals indicating the voltage of the busbar 23 detected by the voltage sensor 61.

[0055] The detection connector 43 includes at least one temperature pin 43a and a plurality of voltage pins 43b. In this embodiment, the detection connector 43 has three temperature pins 43a. The temperature pins 43a are pins for temperature detection, and the voltage pins 43b are pins for voltage detection. Each temperature pin 43a is in contact (electrically connected) with one of the three temperature pins 32a of the busbar connector 32. Each voltage pin 43b is in contact (electrically connected) with one of the plurality of voltage pins 32b of the busbar connector 32. Note that the temperature pins 43a are an example of the "second detection pins" of this disclosure.

[0056] As a result, one of the three temperature pins 43a is electrically connected to the temperature sensor 52 (Figure 2) via wiring 34 (Figure 2) and temperature pin 32a. This allows the one temperature pin 43a to receive (acquire) a signal indicating the temperature of the busbar 33 (Figure 2) detected by the temperature sensor 52. Each voltage pin 43b is electrically connected to the voltage sensor 62 (Figure 2) via wiring 35 (Figure 2) and voltage pin 32b. This allows each voltage pin 43b to receive (acquire) a signal indicating the voltage of the busbar 33 detected by the voltage sensor 62.

[0057] In this embodiment, the number of temperature pins 42a (3) and the number of temperature pins 43a (3) are equal to the sum of the number of busbars 23 whose temperature is detected by the temperature sensor 51 (Figure 2) (2) and the number of busbars 33 whose temperature is detected by the temperature sensor 52 (Figure 2) (1). The numbers of busbars 23 and busbars 33 mentioned above refer to the number of busbars whose temperature is detected in each cell module (10A, 10B).

[0058] As a result, each of the temperature pins 42a and 43a includes a redundant (spare) pin, so if a malfunction occurs in the temperature pins 42a and 43a that are in use, the redundant (spare) pin can be used instead.

[0059] Furthermore, by providing the aforementioned redundant (spare) pins, the number of busbars 23 (busbar 33) on which temperature is detected can be easily increased.

[0060] Furthermore, as shown in Figure 4, at least one temperature pin 42a may be located on the opposite side of the cell module 10 from the voltage pin 42b. At least one temperature pin 43a may be located on the opposite side of the cell module 10 from the voltage pin 43b. Also, the temperature pin 42a may be located in the same position as the temperature pin 43a in the Y direction. Note that the positional relationship between the temperature pin 42a and the voltage pin 42b (and the positional relationship between the temperature pin 43a and the voltage pin 43b) may be reversed from the example above.

[0061] Figure 5 shows the pin arrangement of the detection connector 42. As shown in Figure 5, some of the three temperature pins 42a (two in Figure 5) are located on the Z1 side of the remaining part of the three temperature pins 42a (one in Figure 5).

[0062] The detection connector 42 includes three pins 42c and several pins 42d. Pins 42c are ground pins corresponding to the temperature pins 42a. Two of the three pins 42c (two in Figure 5) are located on the Z1 side of the remaining pins 42c (one in Figure 5). The three pins 42c are located on the opposite side of the cell module 10 from the three temperature pins 42a. Pins 42d are unused or for other purposes (e.g., power supply).

[0063] Figure 6 shows the pin arrangement of the detection connector 43. As shown in Figure 6, some of the three temperature pins 43a (two in Figure 6) are located on the Z1 side of the remaining part of the three temperature pins 43a (one in Figure 6).

[0064] The detection connector 43 includes three pins 43c and several pins 43d. Pins 43c are ground pins corresponding to the temperature pins 43a. Two of the three pins 43c (two in Figure 6) are located on the Z1 side of the remaining pins 43c (one in Figure 6). The three pins 43c are located on the opposite side of the cell module 10 from the three temperature pins 43a. Pins 43d are unused or have other uses (for example, ground pins corresponding to the power supply).

[0065] As described above, in this embodiment, the detection connector 42 is electrically connected to the temperature sensor 51 and is located on the X1 side relative to the module body 41. The detection connector 43 is electrically connected to the temperature sensor 52 and is located on the X2 side relative to the module body 41. This means that, unlike the case where, for example, the temperature sensor 51 and the detection connector 43 are electrically connected (or the temperature sensor 52 and the detection connector 42 are electrically connected), the wiring connecting the temperature sensor and the detection connector does not need to be extended from one side to the other of the cell module in the X direction. Therefore, the need to arrange the wiring to wrap around is reduced, and the wiring becoming tangled (the wiring becoming complex) can be easily suppressed. As a result, the temperature sensor and the detection connector can be easily connected. This means that the detection module 40 can be easily electrically connected to each of the temperature sensor 51 and temperature sensor 52. Furthermore, as described above, the wiring structure can be simplified and the wiring length can be shortened, so the energy storage device 100 can be easily miniaturized.

[0066] Furthermore, the printed circuit board 21 is positioned opposite side surface 1 of the cell module 10, and the printed circuit board 31 is positioned opposite side surface 2 of the cell module 10. This makes it possible to reduce the width of the cell module 10 in the Z direction (reduce its height) compared to when the printed circuit board is positioned on the top surface (Z1 side) of the cell module 10. Therefore, it is possible to reduce the width of the cell module 10 in the Z direction (reduce its height) while simplifying the wiring structure that electrically connects the detection module 40 to each of the temperature sensors 51 and 52. Thus, configuring it as described above is particularly effective in suppressing the increase in size of the energy storage device 100.

[0067] <Variation> The above embodiment shows an example in which a temperature sensor is placed on the busbar, but the disclosure is not limited thereto. For example, the temperature sensor may be placed in the portion of the energy storage cell near the busbar. In this case, the temperature sensor may be capable of detecting (estimating) the temperature of the busbar. A signal indicating the busbar temperature detected (estimated) by the temperature sensor may be transmitted to a detection module.

[0068] In the above embodiment, an example was shown in which the module body 41 of the detection module 40 is positioned to overlap with the cell module 10 in the Y direction, but the disclosure is not limited thereto. For example, the module body 41 (detection module 40) and the cell module 10 may be positioned offset from each other in the X or Z direction.

[0069] In the above embodiment, an example was shown in which detection module 40a and detection module 40b are provided in the energy storage device 100, but the disclosure is not limited thereto. The energy storage device may be provided with only one of detection module 40a and detection module 40b.

[0070] In the above embodiment, an example was shown where the number of temperature pins 42a and 43a were equal to the sum of the number of busbars 23 whose temperature is detected by the temperature sensor 51 and the number of busbars 33 whose temperature is detected by the temperature sensor 52. However, the disclosure is not limited to this example. The number of temperature pins 42a and 43a may each be greater than the above sum. Alternatively, the number of temperature pins 42a may be equal to the number of busbars 23 whose temperature is detected by the temperature sensor 51, and the number of temperature pins 43a may be equal to the number of busbars 33 whose temperature is detected by the temperature sensor 52.

[0071] It should be noted that the embodiments disclosed herein are illustrative in all respects and not restrictive. The scope of this disclosure is defined by the claims rather than the description of the embodiments above, and includes all modifications within the meaning and scope equivalent to the claims. [Explanation of Symbols]

[0072] 1 Side (1st side), 2 Side (2nd side), 3 Center of module, 4,5 End (one end), 10 Cell module, 11 Energy storage cell, 20 Busbar module, 21 Printed circuit board (1st printed circuit board), 22 Busbar connector (1st busbar connector), 23 Busbar (1st busbar), 24 Wiring (1st wiring), 31 Printed circuit board (2nd printed circuit board), 32 Busbar connector (2nd busbar connector), 33 Busbar (2nd busbar), 34 Wiring (2nd wiring), 40 Detection module, 40a Detection module (1st detection module), 40b Detection module (2nd detection module), 41 Module body, 42 Detection connector (1st detection connector), 42a Temperature pin (1st detection pin), 43 Detection connector (2nd detection connector), 43a Temperature pin (2nd detection pin), 50 Temperature detection unit, 51 temperature sensor (first temperature detection unit), 52 temperature sensor (second temperature detection unit), 100 energy storage device, P position (predetermined position).

Claims

1. A cell module containing multiple energy storage cells arranged in the direction of the array, A busbar module electrically connected to the aforementioned cell module, Temperature detection unit and The cell module comprises at least one detection module that is electrically connected to the temperature detection unit and is located on one end of the cell module in the arrangement direction, The direction that intersects the aforementioned arrangement direction is defined as the intersecting direction. One of the aforementioned intersecting directions is defined as the first direction. If the other direction of the aforementioned intersection is designated as the second direction, The aforementioned busbar module is In the cell module, a plurality of first busbars are arranged on the side of the first direction from the center of the module, which is located in the center of the intersecting direction, The module includes a plurality of second busbars arranged to the second direction side of the center of the module, The temperature detection unit is A first temperature detection unit is located on the first side of the center of the module and is capable of detecting the temperature of at least one of the plurality of first busbars, The module includes a second temperature detection unit, which is positioned on the second side of the center of the module and capable of detecting the temperature of at least one of the plurality of second busbars, The detection module includes a module body and a first detection connector and a second detection connector connected to the module body. The first detection connector is electrically connected to the first temperature sensing unit and is positioned on the first direction side relative to the module body. The second detection connector is electrically connected to the second temperature sensing unit and is positioned on the second direction side with respect to the module body, and is part of the energy storage device.

2. The energy storage device according to claim 1, wherein the module body is positioned to overlap with the cell module in the arrangement direction.

3. The at least one detection module is A first detection module is positioned on one side of the cell module in the arrangement direction, Includes a second detection module positioned on the other side of the arrangement direction relative to the cell module, The first detection module includes a first detection connector electrically connected to a first temperature detection unit located on one side of a predetermined position in the arrangement direction, and a second detection connector electrically connected to a second temperature detection unit located on one side of a predetermined position in the arrangement direction. The energy storage device according to claim 1 or 2, wherein the second detection module has a first detection connector electrically connected to a first temperature detection unit located on the other side of the predetermined position in the arrangement direction, and a second detection connector electrically connected to a second temperature detection unit located on the other side of the predetermined position in the arrangement direction.

4. The aforementioned busbar module is A first busbar connector connected to the first detection connector, A first printed circuit board having a first wiring formed on it that electrically connects the first busbar and the first busbar connector, The second busbar connector is connected to the second detection connector, The invention includes a second printed circuit board on which a second wiring is formed that electrically connects the second busbar and the second busbar connector, The aforementioned cell module is The first surface on the first direction side in the aforementioned intersecting direction, Including the second surface on the second direction side in the aforementioned crossing direction, The first printed circuit board is positioned opposite the first side surface, The energy storage device according to claim 1 or 2, wherein the second printed circuit board is positioned opposite to the second side surface.

5. The first detection connector includes a first detection pin for temperature detection. The second detection connector includes a second detection pin for temperature detection. The energy storage device according to claim 1 or 2, wherein the number of the first detection pins and the number of the second detection pins are each greater than or equal to the sum of the number of the first busbars whose temperature is detected by the first temperature detection unit and the number of the second busbars whose temperature is detected by the second temperature detection unit.

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