Electricity storage device

Abstract

The invention provides a power storage device. The temperature detection unit includes a first temperature detection portion disposed closer to the first direction side than the module center and a second temperature detection portion disposed closer to the second direction side than the module center. The first detection connector is electrically connected to the first temperature detection unit, and is disposed on the first direction side with respect to the module main body. The second detection connector is electrically connected to the second temperature detection unit, and is disposed on the second direction side with respect to the module main body.

Description

Technical Field

[0001] This disclosure relates to energy storage devices. Background Technology

[0002] Japanese Patent Application Publication No. 2024-085194 discloses a secondary battery having multiple battery cells arranged in a row. The secondary battery includes a busbar connecting the positive terminals of each battery cell to each other and the negative terminals of each battery cell to each other. A temperature sensing unit, serving as a sensor for detecting the temperature of the busbar, is disposed on the busbar. Signals from the temperature sensing units disposed on each busbar are transmitted via a flexible plate to a connector disposed on the outside of the flexible plate. Summary of the Invention

[0003] In the secondary battery (energy storage device) described in Japanese Patent Application Publication No. 2024-085194, as mentioned above, a signal is transmitted from a temperature detection unit disposed on a busbar at both ends of the battery cell (energy storage cell) to the connector. For example, if the connector (pins) are configured to face one end, it is considered difficult to electrically connect the temperature detection unit on the other end to the connector. Specifically, in order to electrically connect the temperature detection unit on the other end to the connector via a flexible substrate, the flexible substrate needs to be routed to one end. Therefore, it is considered that the secondary battery should be made larger.

[0004] This disclosure was made to solve the above-mentioned problems, and its purpose is to provide an energy storage device in which temperature detection units are provided on both sides of the intersection direction that intersects the arrangement direction of the energy storage units, and the detection module arranged at one end of the arrangement direction of the unit modules can be easily electrically connected to the temperature detection units on both sides.

[0005] An energy storage device according to one aspect of the present invention includes: a battery module comprising a plurality of energy storage units arranged in an arrangement direction; a busbar module electrically connected to the battery module; a temperature detection unit; and at least one detection module electrically connected to the temperature detection unit and disposed in the battery module at one end of the arrangement direction. When a direction intersecting the arrangement direction is designated as the intersecting direction, one direction of the intersecting direction is designated as the first direction, and the other direction of the intersecting direction is designated as the second direction, the busbar module includes: a plurality of first busbars disposed further towards the first direction than the center of the module located in the intersecting direction in the battery module; and a plurality of second busbars disposed further towards the second direction than the center of the module. The temperature detection unit includes: a first temperature detection unit disposed further towards the first direction than the center of the module, capable of detecting the temperature of at least one of the plurality of first busbars; and a second temperature detection unit disposed further towards the second direction than the center of the module, 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 detection unit and is disposed relative to the module body on the first direction side. The second detection connector is electrically connected to the second temperature detection unit and is configured on the second direction side relative to the module body.

[0006] The above and other objects, features, aspects and advantages of the present invention will become apparent from the following detailed description relating to the invention, taken in conjunction with the accompanying drawings. Attached Figure Description

[0007] Figure 1 This is a perspective view showing the structure of the energy storage device according to this embodiment.

[0008] Figure 2 It is a top view showing the detailed structure of the energy storage device.

[0009] Figure 3 It means Figure 2 A magnified view of the battery module and detection module.

[0010] Figure 4 It means Figure 2 A magnified view of a portion of the structure near the detection module.

[0011] Figure 5 This is a diagram showing the pin arrangement of the detection connector on the X1 side.

[0012] Figure 6 This is a diagram showing the pin arrangement of the detection connector on the X2 side. Detailed Implementation

[0013] Embodiments of the present invention will be described with reference to the accompanying drawings. Furthermore, in the drawings referred to below, the same or equivalent parts are labeled with the same reference numerals.

[0014] Figure 1 This diagram illustrates the structure of the energy storage device 100 according to this embodiment. The energy storage device 100 is, for example, mounted 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. The application of the energy storage device 100 is not limited to vehicle applications.

[0015] In this specification, the X, Y, and Z directions are mutually orthogonal. For example, the X direction can also be the front-to-back direction of the vehicle when the energy storage device 100 is mounted on it. Similarly, the Y direction can be the left-to-right direction of the vehicle when the energy storage device 100 is mounted on it. Furthermore, the Z direction can be the up-down direction when the energy storage device 100 is mounted on it. For example, Z1 and Z2 can be up and down, respectively. Alternatively, the X direction can be left-to-right, and the Y direction can be front-to-back. Moreover, the X and Y directions are examples of the "intersecting direction" and "arrangement direction" of this disclosure, respectively.

[0016] The energy storage device 100 includes a battery 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 battery module 10.

[0017] The battery module 10 includes a side (first side) 1 and a side (second side) 2. Side 1 is the X1 side of the battery module 10. Side 2 is the X2 side of the battery module 10. The X1 side and the X2 side are one side and the other side in the X direction, respectively. Furthermore, the X1 direction and the X2 direction are examples of the "first direction" and "second direction" of this disclosure, respectively. Furthermore, side 1 and side 2 are examples of the "first side" and "second side" of this disclosure, respectively.

[0018] Busbar module 20 is configured at the center 3 of the module in the X direction, which is located in the center of the battery module 10. Figure 1 (Represented by the dashed line) is positioned closer to the X1 side. Busbar module 30 is positioned closer to the X2 side than module center 3.

[0019] Busbar module 20 includes a printed circuit board (first printed circuit board) 21, two busbar connectors (first busbar connectors) 22, and multiple busbars (first busbars) 23. Figure 2 Printed substrate 21 and busbar connector 22 are examples of the "first printed substrate" and "first busbar connector" of this disclosure, respectively. In addition, busbar 23 is an example of the "first busbar" of this disclosure.

[0020] The printed circuit board 21 is positioned opposite the side surface 1 of the battery module 10. Specifically, the printed circuit board 21 and the side surface 1 are opposite each other in the X direction. In addition, the printed circuit board 21 and the side surface 1 are respectively perpendicular to the X direction.

[0021] One and the other of the two busbar connectors 22 are respectively disposed on the Y1 side end and the Y2 side end of the printed circuit board 21. The Y1 side busbar connector 22 is located further to the Y1 side than the Y1 side end (one end) 4 of the battery module 10. The Y2 side busbar connector 22 is located further to the Y2 side than the Y2 side end (one end) 5 of the battery module 10. In addition, end 4 and end 5 are examples of "one end" in this disclosure.

[0022] Busbar module 30 includes a printed circuit board (second printed circuit board) 31, two busbar connectors (second busbar connectors) 32, and multiple busbars (second busbars) 33. Figure 2 Printed substrate 31 and busbar connector 32 are examples of the "second printed substrate" and "second busbar connector" of this disclosure, respectively. Busbar 33 is an example of the "second busbar" of this disclosure.

[0023] The printed circuit board 31 is positioned opposite the side surface 2 of the battery module 10. Specifically, the printed circuit board 31 and the side surface 2 are opposite each other in the X direction. The printed circuit board 31 and the side surface 2 are respectively orthogonal to the X direction.

[0024] One and the other of the two busbar connectors 32 are respectively disposed on the Y1 side end and the Y2 side end of the printed circuit board 31. The busbar connector 32 on the Y1 side is located further to the Y1 side than the end 4 of the battery module 10. The busbar connector 32 on the Y2 side is located further to the Y2 side than the end 5 of the battery module 10.

[0025] The detection module 40 includes a detection module (first detection module) 40a and a detection module (second detection module) 40b. Each of the detection modules 40a and 40b is electrically connected to each of the busbar modules 20 and 30. Furthermore, the detection modules 40a and 40b have the same structure. When referred to as detection module 40 in the following description, it refers to both detection modules 40a and 40b. Additionally, detection modules 40a and 40b are examples of the "first detection module" and "second detection module" of this disclosure, respectively.

[0026] Detection module 40a is disposed on end 4 of battery module 10. Specifically, detection module 40a is disposed on the Y1 side relative to end 4. Detection module 40a and end 4 are opposite each other in the Y direction. Detection module 40b is disposed on end 5 of battery module 10. Specifically, detection module 40b is disposed on the Y2 side relative to end 5. Detection module 40b and end 5 are opposite each other in the Y direction.

[0027] The detection module 40 includes a module body 41, a detection connector (first detection connector) 42, and a detection connector (second detection connector) 43. Detection connector 42 and detection connector 43 are respectively connected to the module body 41. Detection connector 42 and detection connector 43 are examples of the "first detection connector" and "second detection connector" of this disclosure.

[0028] The detection connector 42 is disposed on the X1 side relative to the module body 41. The detection connector 43 is disposed on the X2 side relative to the module body 41. That is, the module body 41 is disposed between the detection connector 42 and the detection connector 43 in the X direction.

[0029] The module body 41 is positioned overlapping the battery module 10 in the Y direction. Additionally, detection connectors 42 and 43 are also positioned overlapping the battery module 10 in the Y direction. Specifically, the detection module 40 is housed in the X direction within the range between the positions on side 1 and side 2 of the battery module 10. Busbar connectors 22 and 32 are also positioned in the X direction within the aforementioned range.

[0030] Therefore, compared to the case where the module body 41 (detection module 40) is positioned offset from the unit module 10 in the X direction, the energy storage device 100 can be easily miniaturized.

[0031] 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.

[0032] Figure 2This is a schematic top view showing the detailed structure of the energy storage device 100. The battery module 10 includes a plurality of (50 in this embodiment) energy storage cells 11, plates 12, and a pair of end plates 13. The plurality of energy storage cells 11 are arranged in the X direction. Additionally, in Figure 2 In order to make the wiring diagram described later easier to understand, the thickness of the printed circuit board 21 and the printed circuit board 31 is shown to be larger than the actual thickness, and the wiring is shown to be staggered from each other.

[0033] Plate 12 is disposed at the center of a plurality of energy storage units 11. The position in the Y direction where plate 12 is disposed is designated as position (predetermined position) P. Twenty-five energy storage units 11 are arranged in various regions further Y1 and Y2 than plate 12. Unit module 10 includes: unit module 10A composed of the 25 energy storage units 11 further Y1 than plate 12, and unit module 10B composed of the 25 energy storage units 11 further Y2 than plate 12. Furthermore, plate 12 is, for example, formed of resin. Position P is an example of the "predetermined position" of this disclosure.

[0034] The battery module 10 is held between a pair of end plates 13. One of the end plates 13 is located at the end 4 of the battery module 10. Figure 1 Between the battery module 10 and the detection module 40a. Another of the pair of end plates 13 is configured at the end 5 of the battery module 10. Figure 1 Between ) and detection module 40b.

[0035] The detection module 40a receives signals, including those indicating the temperature and voltage of the energy storage unit 11 of the battery module 10A (described later). The detection module 40B receives signals, including those indicating the temperature and voltage of the energy storage unit 11 of the battery module 10B (described later).

[0036] Figure 3 yes Figure 2 A magnified view of a portion of the image. For example... Figure 3 As shown, each of the multiple energy storage units 11 has an electrode terminal 11a and an electrode terminal 11b. One of the electrode terminals 11a and 11b is a positive terminal, and the other is a negative terminal. Electrode terminal 11a is disposed at one end of each energy storage unit 11 in the X direction. Electrode terminal 11a is disposed at the other end of each energy storage unit 11 in the X direction.

[0037] Multiple energy storage units 11 are arranged in an alternating reverse orientation in the X direction. That is, energy storage units 11 with electrode terminals 11a on the X1 side and electrode terminals 11b on the X2 side, and energy storage units 11 with electrode terminals 11a on the X2 side and electrode terminals 11b on the X1 side are alternately arranged in the Y direction. Furthermore, the electrode terminals 11a and 11b on the X1 side are disposed on side 1 of the battery module 10, and the electrode terminals 11a and 11b on the X2 side are disposed on side 2 of the battery module 10.

[0038] Multiple busbars 23 connect the electrode terminals 11a and 11b of one energy storage unit 11 arranged in the Y direction to the electrode terminals 11b of another energy storage unit 11. Furthermore, only one of the multiple busbars 23 connects the electrode terminals 11a and 11b of two adjacent energy storage units 11 located on opposite sides of the plate 12 in the Y direction. That is, only one of the busbars 23 extends across the plate 12 (see reference). Figure 2 Additionally, in Figure 2 and Figure 3 In the illustration, the busbar 23 is positioned closer to the energy storage unit 11 than the printed circuit board 21, but this disclosure is not limited to this example. For instance, the busbar 23 and the printed circuit board 21 may also be positioned overlapping in the Z direction. Similarly, the same arrangement can be applied to the busbar 33 and the printed circuit board 31.

[0039] Multiple busbars 33 respectively connect the electrode terminal 11a of one energy storage unit 11 and the electrode terminal 11b of another energy storage unit 11 arranged in the Y direction.

[0040] The 50 energy storage units 11 arranged in the Y direction are connected in series to the ground through multiple busbars 23 and multiple busbars 33.

[0041] Refer again Figure 2 The energy storage device 100 includes a temperature detection unit 50 and a voltage detection unit 60. Each of the temperature sensing unit 50 and the voltage sensing unit 60 is electrically connected to the detection module 40.

[0042] The temperature sensing unit 50 includes at least one temperature sensor (first temperature detection unit) 51 and at least one temperature sensor (second temperature detection unit) 52. Furthermore, the temperature sensors 51 and 52 are respectively positioned symmetrically with respect to the plate 12 in the Y direction. Additionally, temperature sensors 51 and 52 are examples of the "first temperature detection unit" and "second temperature detection unit" of this disclosure, respectively.

[0043] Temperature sensor 51 is located in the center of the comparison module 3 ( Figure 1The temperature sensor 51 is located closer to the X1 side. Specifically, the temperature sensor 51 is disposed on a portion of the multiple busbars 23. More specifically, the temperature sensor 51 is disposed on the busbar 23 closest to the detection module 40 and the busbar 23 corresponding to the center position in the Y direction of the battery module 10A (battery module 10B). That is, the temperature sensor 51 is disposed on four of the multiple busbars 23. In addition, the temperature sensor 51 detects (senses) the temperature of the busbar 23 on which the temperature sensor 51 is disposed.

[0044] Temperature sensor 52 is positioned in the center of the comparison module 3 ( Figure 1 (More towards the X2 side.) Specifically, the temperature sensor 52 is disposed on a portion of the plurality of busbars 33. More specifically, the temperature sensor 52 is disposed on the busbar 33 closest to the plate 12 among the plurality of busbars 33. That is, the temperature sensor 52 is disposed on two of the plurality of busbars 33. The temperature sensor 52 detects (senses) the temperature of the busbar 33 on which the temperature sensor 52 is disposed.

[0045] In conventional energy storage devices, when the detection connector (pins) of the detection module is configured, for example, toward the X1 side, it is considered difficult to electrically connect the sensor on the X2 side to the detection connector.

[0046] Therefore, in this embodiment, the detection connector 42 disposed on the X1 side of the module body 41 is electrically connected to the temperature sensor 51. The detection connector 43 disposed on the X2 side of the module body 41 is electrically connected to the temperature sensor 52.

[0047] Specifically, wiring (first wiring) 24 and wiring 25 are formed on the printed circuit board 21. Wiring 24 electrically connects the temperature sensor 51 and the bus connector 22. Wiring 24 and wiring 25 are patterns (metal foil, etc.) formed on the printed circuit board 21. Figure 2 In the diagram, wiring 24 is represented by a dashed line, and wiring 25 is represented by a solid line. Furthermore, wiring 24 is an example of the "first wiring" of this disclosure.

[0048] Additionally, wiring (second wiring) 34 and wiring 35 are formed on the printed circuit board 31. Wiring 34 electrically connects the temperature sensor 52 and the bus connector 32. Wiring 34 and wiring 35 are patterns (metal foil, etc.) formed on the printed circuit board 31. Figure 2 In the diagram, wiring 34 is represented by a dashed line, and wiring 35 is represented by a solid line. Furthermore, wiring 34 is an example of the "second wiring" of this disclosure.

[0049] The detection connector 42 of detection module 40a is electrically connected to a temperature sensor 51 disposed in the Y direction further Y1 than the position P on plate 12. The detection connector 43 of detection module 40a is electrically connected to a temperature sensor 52 disposed in the Y direction further Y1 than the position P. The detection connector 42 of detection module 40b is electrically connected to a temperature sensor 51 disposed in the Y direction further Y2 than the position P. The detection connector 43 of detection module 40b is electrically connected to a temperature sensor 52 disposed in the Y direction further Y2 than the position P.

[0050] Therefore, temperature sensors and detection connectors can be easily connected in the two regions of the Y1 and Y2 sides of the battery module 10, and the wiring structure can be simplified.

[0051] The voltage detection unit 60 includes multiple voltage sensors 61 and multiple voltage sensors 62. Voltage sensors 61 are disposed on each busbar 23. Voltage sensors 62 are disposed on each busbar 33. A voltage sensor 61 is also disposed on a busbar 23 where a temperature sensor 51 is disposed. A voltage sensor 62 is also disposed on a busbar 33 where a temperature sensor 52 is disposed. Alternatively, the temperature sensor 51 and voltage sensor 61 disposed on a shared busbar 23 can be integrally formed. The temperature sensor 52 and voltage sensor 62 disposed on a shared busbar 33 can also be integrally formed.

[0052] Voltage sensor 61 can also detect the voltage of the busbar 23 on which voltage sensor 61 is mounted (the voltage difference between the energy storage units 11 connected by busbar 23). Additionally, voltage sensor 61 can also detect the voltage of each of the two energy storage units 11 connected by the aforementioned busbar 23. Voltage sensor 62 can be the same as voltage sensor 61 in this respect.

[0053] Wiring 25 on printed circuit board 21 electrically connects voltage sensor 61 and busbar connector 22. Wiring 35 on printed circuit board 31 electrically connects voltage sensor 62 and busbar connector 32.

[0054] Figure 4 This is a schematic diagram showing the detailed construction of the testing connectors (42, 43) and the busbar connectors (22, 32). Figure 4 For simplicity, some of the pin diagrams described later have been omitted.

[0055] The busbar connector 22 has at least one temperature pin 22a and multiple voltage pins 22b. In this embodiment, the busbar connector 22 has three temperature pins 22a. Two of the three temperature pins 22a are connected to wiring 24 ( Figure 2 Electrical connection.

[0056] The busbar connector 32 has at least one temperature pin 32a and multiple voltage pins 32b. In this embodiment, the busbar connector 32 has three temperature pins 32a. One of the three temperature pins 32a is connected to wiring 34 ( Figure 2 Electrical connection.

[0057] The detection connector 42 has at least one temperature pin (first detection pin) 42a and a plurality of voltage pins 42b. In this embodiment, the detection connector 42 has three temperature pins 42a. Furthermore, the temperature pins 42a are for temperature detection, and the voltage pins 42b are 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 any one of the plurality of voltage pins 22b of the busbar connector 22. Additionally, the temperature pin 42a is an example of the "first detection pin" of this disclosure.

[0058] Therefore, two of the three temperature pins 42a are connected via wiring 24 ( Figure 2 ) and temperature pin 22a with temperature sensor 51 ( Figure 2 Electrical connection. Thus, the two temperature pins 42a receive (acquire) information from the busbar 23 (as detected by the temperature sensor 51). Figure 2 The voltage signal is transmitted through wiring 25 ( ). Figure 2 ) and voltage pin 22b and voltage sensor 61 ( Figure 2 Electrical connection. Thus, voltage pin 42b receives (acquires) a signal representing the voltage of busbar 23 detected by voltage sensor 61.

[0059] The detection connector 43 includes at least one temperature pin (second detection 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 for temperature detection, and the voltage pins 43b are for voltage detection. Each temperature pin 43a is in contact (electrically connected) with any one of the three temperature pins 32a of the busbar connector 32. Each voltage pin 43b is in contact (electrically connected) with any one of the plurality of voltage pins 32b of the busbar connector 32. Furthermore, the temperature pin 43a is an example of the "second detection pin" of this disclosure.

[0060] Therefore, one of the three temperature pins 43a is connected via wiring 34 ( Figure 2 ) and temperature pin 32a with temperature sensor 52 ( Figure 2 Electrical connection. Thus, the aforementioned temperature pin 43a receives (acquires) information from the busbar 33 (detected by temperature sensor 52). Figure 2The voltage signal is transmitted through wiring 35 ( ). Figure 2 ) and voltage pin 32b and voltage sensor 62 ( Figure 2 Electrical connection. Thus, each voltage pin 43b receives (acquires) a signal representing the voltage of busbar 33 detected by voltage sensor 62.

[0061] In this embodiment, the number (3) of temperature pins 42a and the number (3) of temperature pins 43a are respectively equal to the number of temperature sensors 51 ( Figure 2 The number of busbars 23 used for temperature detection (2) and the number of busbars 23 used for temperature detection (2) are related to the temperature sensor 52. Figure 2 The total number of busbars 33 used for temperature detection (1). In addition, the number of busbars 23 and 33 mentioned above refers to the number of busbars used for temperature detection in each battery module (10A, 10B).

[0062] Therefore, since temperature pins 42a and 43a each contain redundant (spare) pins, even if temperature pins 42a and 43a malfunction during use, the aforementioned redundant (spare) pins can be used instead.

[0063] In addition, by setting the aforementioned redundant (prepared) pins, the number of busbars 23 (busbars 33) for the detected temperature can be easily increased.

[0064] In addition, such as Figure 4 As shown, at least one temperature pin 42a can be located on the side opposite to the voltage pin 42b and the battery module 10. At least one temperature pin 43a can be located on the side opposite to the voltage pin 43b and the battery module 10. Alternatively, the temperature pin 42a can also be positioned in the same location as the temperature pin 43a in the Y direction. Furthermore, the positional relationship between the temperature pin 42a and the voltage pin 42b (and vice versa) can be the reverse of the example described above.

[0065] Figure 5 This is a diagram showing the pin arrangement of the detection connector 42. (See diagram for example.) Figure 5 As shown, a portion of the three temperature pins 42a (in) Figure 5 The remaining portion (of which 2 are located) is configured in the 3 temperature pins 42a. Figure 5 The Z1 side is 1 (with 1 in the middle).

[0066] The detection connector 42 includes three pins 42c and multiple pins 42d. Pin 42c is a grounding pin (grounding use) corresponding to the temperature pin 42a. A portion of the three pins 42c (in...) Figure 5 The remaining portion of the three pins in the 42c configuration (two of which are in the middle) is configured in the 3-pin 42c. Figure 5 On the Z1 side (one of which is in the middle). Three pins 42c are configured on the opposite side of the battery module 10 relative to three temperature pins 42a. In addition, pin 42d is an unused pin or a pin for other purposes (e.g., for power supply).

[0067] Figure 6 This is a diagram showing the pin arrangement of the detection connector 43. (See diagram for example.) Figure 6 As shown, a portion of the three temperature pins 43a (in) Figure 6 The remaining portion (of which 2 are located) is configured in the 3 temperature pins 43a. Figure 6 The Z1 side is 1 (with 1 in the middle).

[0068] The detection connector 43 includes three pins 43c and multiple pins 43d. Pin 43c is a grounding pin (grounding use) corresponding to the temperature pin 43a. A portion of the three pins 43c (in...) Figure 6 The remaining portion of the three pins 43c (two of which are in the middle) are configured in the middle. Figure 6 The Z1 side (with one in the middle) has three pins 43c arranged opposite to the three temperature pins 43a on the opposite side of the battery module 10. Additionally, pin 43d is an unused pin or a pin used for other purposes (e.g., grounding corresponding to the power supply).

[0069] As described above, in this embodiment, the detection connector 42 is electrically connected to the temperature sensor 51 and is disposed on the X1 side relative to the module body 41. The detection connector 43 is electrically connected to the temperature sensor 52 and is disposed on the X2 side relative to the module body 41. Therefore, unlike the case where 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 extend from one side of the battery module to the other in the X direction. Therefore, the necessity of configuring the wiring to be circuitous is reduced, and the wiring can be easily prevented from becoming tangled (wiring complexity). As a result, the temperature sensor and the detection connector can be easily connected. Thus, the detection module 40 can be easily electrically connected to the temperature sensor 51 and the temperature sensor 52 respectively. Furthermore, as described above, the wiring structure can be simplified, and the wiring length can be shortened, thus making it easy to miniaturize the energy storage device 100.

[0070] Furthermore, the printed circuit board 21 is positioned opposite side 1 of the battery module 10, and the printed circuit board 31 is positioned opposite side 2 of the battery module 10. Therefore, compared to the case where the printed circuit boards are positioned on the upper surface (Z1 side surface) of the battery module 10, the width of the battery module 10 in the Z direction can be reduced (height reduced). Thus, the width of the battery module 10 in the Z direction can be reduced (height reduced) while simplifying the wiring structure that electrically connects the detection module 40 to the temperature sensors 51 and 52 respectively. Therefore, the structure described above is particularly effective in suppressing the enlargement of the energy storage device 100.

[0071] <Variation Example>

[0072] In the above embodiments, an example of a temperature sensor being configured on the busbar is shown, but this disclosure is not limited thereto. For example, the temperature sensor may also be configured in a portion near the busbar in the energy storage unit. In this case, the temperature sensor can detect (predict) the temperature of the busbar. A signal indicating the temperature of the busbar detected (predicted) by the temperature sensor can be sent to the detection module.

[0073] In the above embodiments, an example is shown where the module body 41 of the detection module 40 is positioned overlapping the battery module 10 in the Y direction, but this disclosure is not limited thereto. For example, the module body 41 (detection module 40) and the battery module 10 may be offset from each other in the X or Z direction.

[0074] In the above embodiments, an example is shown where detection modules 40a and 40b are disposed in the energy storage device 100, but this disclosure is not limited thereto. The energy storage device may also have only one of detection modules 40a and 40b.

[0075] In the above embodiment, an example is shown where the number of temperature pins 42a and 43a is equal to the total number of busbars 23 whose temperature is detected by temperature sensor 51 and the total number of busbars 33 whose temperature is detected by temperature sensor 52, respectively. However, this disclosure is not limited to this. It is also possible that the number of temperature pins 42a and 43a is greater than the total number described above. Alternatively, it is also possible that the number of temperature pins 42a is equal to the number of busbars 23 whose temperature is detected by temperature sensor 51, and the number of temperature pins 43a is equal to the number of busbars 33 whose temperature is detected by temperature sensor 52.

[0076] Embodiments of the present invention have been described, but should be considered illustrative rather than restrictive in all respects. The scope of the invention is defined by the claims, including all modifications within the meaning and scope equivalent to the claims.

Claims

1. An energy storage device, comprising: A battery module comprising multiple energy storage units arranged in an array direction; The busbar module is electrically connected to the battery module; Temperature detection unit; and At least one detection module is electrically connected to the temperature detection unit and is disposed at one end of the battery module in the arrangement direction. The direction intersecting the arrangement direction is defined as the intersection direction. Designate one of the intersecting directions as the first direction. When the other direction of the intersection is set as the second direction. The busbar module includes: Multiple first busbars are configured further along the first direction side than the center of the battery module located in the center of the intersecting direction. Multiple second busbars are configured on the second direction side, further from the center of the module. The temperature detection unit includes: A first temperature detection unit, disposed further along the first direction side than the center of the module, is capable of detecting the temperature of at least one of the plurality of first busbars; and The second temperature detection unit is disposed further away from the center of the module in the second direction, and is 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 detection unit and is configured on the first direction side relative to the module body. The second detection connector is electrically connected to the second temperature detection unit and is configured on the second direction side relative to the module body.

2. The energy storage device according to claim 1, wherein, The main body of the module is positioned at a location that overlaps with the battery module in the arrangement direction.

3. The energy storage device according to claim 1 or 2, wherein, The at least one detection module includes: A first detection module is disposed on one side of the arrangement direction relative to the battery module; and The second detection module is configured on the opposite side of the arrangement direction relative to the battery module. The first detection connector of the first detection module is electrically connected to the first temperature detection unit, which is disposed on a side further away from the predetermined position in the arrangement direction. The second detection connector of the first detection module is electrically connected to the second temperature detection unit, which is disposed on a side further away from the predetermined position in the arrangement direction. The first detection connector of the second detection module is electrically connected to the first temperature detection unit, which is arranged on the other side of the arrangement direction, further away from the predetermined position. The second detection connector of the second detection module is electrically connected to the second temperature detection unit, which is arranged on the other side of the arrangement direction, further away from the predetermined position.

4. The energy storage device according to claim 1 or 2, wherein, The busbar module includes: The first busbar connector is connected to the first detection connector; A first printed circuit board is formed with a first wiring that electrically connects the first busbar and the first busbar connector; The second busbar connector is connected to the second detection connector; and The second printed circuit board has a second wiring formed thereon that electrically connects the second busbar and the second busbar connector. The battery module includes: The first side surface on the first direction side in the intersecting direction; and On the second side of the second direction in the intersecting direction, The first printed circuit board is positioned opposite the first side surface. The second printed substrate is positioned opposite the second side.

5. The energy storage device according to claim 1 or 2, wherein, 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 number of the first detection pin and the number of the second detection pin are respectively 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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