Housing of battery pack and battery pack

Abstract

To provide a housing 400 of a battery pack 40 that can suppress the influence on components inside the housing 400 even when an internal pressure rise occurs in the housing 400, and also to provide the battery pack 40.SOLUTION: A housing 400 of a battery pack 40 mounted on a hybrid system 10 includes a housing main body 410 having a first accommodation portion 411 that accommodates a battery module 50 that supplies power to a motor generator 2 of the hybrid system 10 and a second accommodation portion 412 that accommodates a control circuit for the battery module 50, a housing cover 420 attached to the housing main body 410, and a partition portion 415 provided between the first accommodation portion 411 and the second accommodation portion 412 in the housing main body 410 and separating the space of the first accommodation portion 412 from the space of the second accommodation portion 412.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a housing for a battery pack to be mounted in a hybrid system and to a battery pack. [Background technology]

[0002] Patent Document 1 discloses a battery mounting structure used in electric vehicles and hybrid vehicles. This battery mounting structure includes a case that houses a plurality of battery modules for driving the vehicle on the underside of a floor panel of a vehicle interior. The plurality of battery modules are divided into a lower module and an upper module, and the case has a lower case member made of metal, a middle case member made of metal, and an upper case member for covering a predetermined area of ​​the upper surface of the middle case member from above. The lower module is fixed to the bottom of the lower case member, and the middle case member is fixed to the lower case member so as to cover the lower module from above, so that the lower module is housed watertight. The upper module is fixed in a state in which it is in close contact with the upper surface of the middle case member within a predetermined area, and the upper case member is formed in a container shape having an opening at the bottom, and is fixed in a state in which it covers the predetermined area and the periphery of the opening is in close contact with the upper surface of the middle case member, so that the upper module is housed watertight. The lower case member is attached to the underside of the floor panel, so that the case is fixed to the vehicle.

[0003] Patent Document 2 discloses a battery pack device used in, for example, an electric vehicle, which is composed of batteries stacked in multiple stages. The battery pack device includes a first battery group composed of a plurality of batteries arranged on the same plane, and a second battery group composed of a plurality of batteries identical to the first battery group arranged on the same plane in the battery tray, which is stacked on the first battery group with a battery tray in between, and includes a battery pack body including a battery section in which the batteries are electrically connected to each other, and a body case that houses the battery section. The battery is rectangular and can be installed in a first position in which the height in the direction in which the second battery group overlaps with the first battery group is small, and in a second position in which the positions of the terminals of the battery in the overlapping direction are higher than the positions of the terminals in the first position. This battery pack device is characterized in that a first battery of a first battery group is arranged in a second position, a hole is formed in the battery tray through which the vicinity of the terminal of the first battery passes and the terminal of the first battery is exposed to the second battery group side, a second battery of the second battery group near the hole is arranged in the first position, and the first battery and second battery are electrically connected to each other by a connecting member having a fixed shape.

[0004] A large number of battery cells are housed in the housing of the battery pack. Lithium-ion batteries or nickel-metal hydride batteries are used as the battery cells. The battery cells are provided with a valve (safety valve) to release gas when the internal pressure increases due to gas abnormally generated inside the cell. Since the housing of the battery pack is constructed to be watertight, if an abnormality occurs in a battery cell inside the housing and the valve of that cell is activated to release gas, the internal pressure of the housing will rise suddenly. Since the housing also houses components such as a control circuit, wiring, and connectors in addition to the battery cells, it is desirable to suppress the impact of an increase in the internal pressure of the housing on these components. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2020-001451 A [Patent Document 2] JP 2006-080042 A Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention has been made in consideration of the above-mentioned circumstances, and aims to provide a battery pack housing and a battery pack that can suppress the impact on components inside the housing even if an increase in internal pressure occurs in the housing. [Means for solving the problem]

[0007] A first aspect of the present invention is a housing for a battery pack mounted on a hybrid system, comprising: a housing main body having a first storage section that stores a battery module that supplies power to a motor generator of the hybrid system and a second storage section that stores a control circuit for the battery module; a housing cover attached to the housing main body; and a partition section provided between the first storage section and the second storage section in the housing main body, separating the space of the first storage section from the space of the second storage section.

[0008] A second aspect of the present invention is a battery pack mounted on a hybrid system, comprising: a battery module that supplies power to a motor generator of the hybrid system; a control circuit that controls the battery module; and a housing that accommodates the battery module and the control circuit, wherein the housing has a housing main body having a first accommodating portion that accommodates the battery module and a second accommodating portion that accommodates the control circuit, a housing cover attached to the housing main body, and a partition portion provided between the first accommodating portion and the second accommodating portion of the housing main body, and the control circuit includes a BMU (Battery Management Unit) that controls the overall voltage of the battery module. Effect of the Invention

[0009] According to the present invention, it is possible to provide a battery pack housing and a battery pack that can suppress the effect on components inside the housing even if an internal pressure rise occurs in the housing. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a block diagram showing a hybrid system. [Diagram 2] 1 is an external perspective view illustrating a battery pack according to an embodiment of the present invention; [Diagram 3] 1 is a partially exploded perspective view illustrating a battery pack according to an embodiment of the present invention; [Figure 4] 2 is an external perspective view illustrating a housing main body of the housing according to the embodiment; FIG. [Diagram 5] 4 is an external perspective view illustrating a housing cover of the housing according to the embodiment; FIG. [Figure 6] 1 is a schematic cross-sectional view illustrating a battery pack using a housing according to the present embodiment. [Figure 7] 7 is an enlarged schematic cross-sectional view of the periphery of the partition part shown in FIG. 6. [Figure 8]4 is a partial perspective view illustrating an example of a configuration around a partition wall portion. FIG. [Figure 9] FIG. 11 is a block diagram showing a hybrid system according to another embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. The embodiments described below are preferred specific examples of the present invention, and therefore various technically preferable limitations are applied to them, but the scope of the present invention is not limited to these aspects unless otherwise specified in the following description to the effect that the present invention is limited to them. In addition, in each drawing, similar components are given the same reference numerals, and detailed descriptions thereof are omitted as appropriate.

[0012] (Hybrid system) FIG. 1 is a block diagram showing a hybrid system. A battery pack 40 to which the housing according to this embodiment is applied is mounted in a hybrid system 10 shown in Fig. 1. The hybrid system 10 includes an engine 1, a motor generator 2, and the battery pack 40. The hybrid system 10 according to this embodiment further includes a DC / DC converter 70. The engine 1 is an internal combustion engine, for example, a diesel engine. The engine 1 is mounted in, for example, a vehicle (such as a passenger car or a small mobile object) or an industrial machine such as a construction machine or an agricultural machine.

[0013] The engine 1 is, for example, a multi-cylinder diesel engine such as a turbocharged high-output three-cylinder or four-cylinder engine. However, the engine 1 is not limited to a diesel engine. The engine 1 has an ECU (Engine Control Unit) 150. The ECU 150 controls the operation of the engine 1 and also controls the motor generator 2 and the DC / DC converter 70 by communicating with them via, for example, a CAN (Controller Area Network).

[0014] The motor generator 2 operates with power supplied from the battery pack 40 to support the engine 1 when power is required, such as when the vehicle in which the hybrid system 10 is mounted starts or accelerates. The motor generator 2 also uses regenerative braking or the like to convert the kinetic energy of the industrial machinery in which the hybrid system 10 is mounted into electrical energy to generate electricity.

[0015] The battery pack 40 includes a battery module 50, a positive contactor 75, a negative contactor 76, a current value detector 65, a temperature detector 67, a BMU (Battery Management Unit) 85, and a CMU (Cell Management Unit) 87. The battery module 50 is provided as a driving power source for the motor generator 2, and supplies power to the motor generator 2. The battery module 50 includes at least one battery cell 510. In the hybrid system 10 shown in FIG. 1, the battery module 50 includes a number of battery cells 510 required to obtain a voltage of, for example, 48V. An example of the battery cell 510 is a lithium ion battery (LiB). However, the battery cell 510 of this embodiment is not limited to a lithium ion battery. The battery module 50 includes a positive (+) terminal 51 and a negative (-) terminal 52.

[0016] The positive electrode side contactor 75 is provided in an electric circuit between the positive electrode terminal 51 of the battery module 50 and the motor generator 2. Specifically, as shown in Fig. 1, the positive electrode side contactor 75 is provided in positive electrode wirings 173, 174 that connect the positive electrode terminal 51 of the battery module 50 and the motor generator 2. In other words, the electric circuit between the positive electrode terminal 51 of the battery module 50 and the motor generator 2 includes the positive electrode wiring 173 and the positive electrode wiring 174. The positive electrode side contactor 75 is electrically connected to the ECU 150 by a signal line 181, and opens and closes the positive electrode wirings 173, 174 based on a control signal transmitted from the ECU 150 through the signal line 181.

[0017] The positive contactor 75 may be electrically connected to the BMU 85. In this case, the positive contactor 75 opens and closes the positive wirings 173, 174 based on a control signal transmitted from the BMU 85. In the description of the present embodiment, a case in which the positive contactor 75 is electrically connected to the ECU 150 by a signal line 181 will be taken as an example.

[0018] The negative contactor 76 is provided in an electric circuit between the negative terminal 52 of the battery module 50 and the motor generator 2. Specifically, as shown in Fig. 1, the negative contactor 76 is provided in a negative wiring 175 that connects the negative terminal 52 of the battery module 50 and the motor generator 2. In other words, the electric circuit between the negative terminal 52 of the battery module 50 and the motor generator 2 includes the negative wiring 175. The negative contactor 76 is electrically connected to the BMU 85 by a signal line 182, and opens and closes the negative wiring 175 based on a control signal transmitted from the BMU 85 through the signal line 182.

[0019] The negative contactor 76 may be electrically connected to the ECU 150. In this case, the negative contactor 76 opens and closes the negative wiring 175 based on a control signal transmitted from the ECU 150. In the description of the present embodiment, a case in which the negative contactor 76 is electrically connected to the BMU 85 by a signal line 182 will be taken as an example.

[0020] The BMU 85 is an example of a "control circuit" of the present invention. The BMU 85 controls the overall voltage of the battery module 50. That is, the BMU 85 is electrically connected to the ECU 150 by a signal line 193, and controls the negative contactor 76 based on a control signal transmitted from the ECU 150 through the signal line 193. The ECU 150 and the BMU 85 communicate with each other, for example, by a CAN, and monitor each other's states.

[0021] The BMU 85 also monitors the state of the battery module 50 and can detect an abnormality in the battery module 50. For example, the BMU 85 detects an overcharge (minor failure) abnormality or an overcharge (major failure) abnormality based on the voltage of the battery cell 510 acquired from the CMU 87. Alternatively, the BMU 85 detects an overdischarge (minor failure) abnormality or an overdischarge (major failure) abnormality based on the voltage of the battery cell 510 acquired from the CMU 87. Alternatively, the BMU 85 detects an overtemperature (minor failure) abnormality based on the temperature of the battery cell 510 acquired from the CMU 87. Alternatively, the BMU 85 detects an overcurrent abnormality based on a current value acquired from a current value detection unit 65 provided in the positive electrode wiring 174.

[0022] The CMU 87 is an example of the "control circuit" of the present invention. The CMU 87 monitors the state of the battery cells 510 included in the battery module 50 and sends the information to the BMU 85. When the battery module 50 includes a plurality of battery cells 510, the CMU 87 monitors the voltage of each battery cell 510 and sends information on the voltage of each battery cell 510 to the BMU 85 through a signal line 191. The CMU 87 also obtains information on the temperature of the battery cells 510 detected by the temperature detection unit 67 from a signal line 183 and sends the information on the temperature of the battery cells 510 to the BMU 85 through the signal line 191. The CMU 87 may be provided separately from the BMU 85 or may be provided integrally with the BMU 85.

[0023] As described above, the negative electrode wiring 175 electrically connects the negative electrode terminal 52 of the battery module 50 to the motor generator 2, and serves as the ground 100B. For example, the negative electrode wiring 175 is connected to the body of a vehicle or the like in which the hybrid system 10 is mounted, and is grounded. The positive electrode wiring 173 electrically connects the positive electrode terminal 51 of the battery module 50 to the motor generator 2, and also electrically connects the motor generator 2 to the DC / DC converter 70. When the battery module 50 is a 48V lithium-ion battery as in the hybrid system 10 shown in FIG. 1, the potential of the positive electrode wirings 173, 174 relative to the negative electrode wiring 175 is 48V.

[0024] The DC / DC converter 70 is electrically connected to the battery 80 via a positive wiring 171 and a negative wiring 172. An example of the battery 80 is a 12V lead-acid battery. The negative wiring 172 electrically connects the negative terminal 82 of the battery 80 to the DC / DC converter 70, and serves as a ground 100B. For example, the negative wiring 172 is connected to the body of a vehicle or the like in which the hybrid system 10 is mounted and is grounded. The positive wiring 171 electrically connects the positive terminal 81 of the battery 80 to the DC / DC converter 70. When the battery 80 is a 12V lead-acid battery as in the hybrid system 10 shown in FIG. 1, the potential of the positive wiring 171 relative to the negative wiring 172 is 12V.

[0025] As described above, the motor generator 2 uses regenerative braking or the like to convert the kinetic energy of the vehicle or the like in which the hybrid system 10 is mounted into electrical energy to generate electricity. The motor generator 2 supplies a voltage to the battery module 50 to charge the battery module 50, and also supplies a voltage to the battery 80 to charge the battery 80. Here, taking the hybrid system 10 shown in FIG. 1 as an example, the potential of the positive electrode wiring 173 relative to the negative electrode wiring 175 is 48V. That is, the generated voltage of the motor generator 2 is 48V. On the other hand, the potential of the positive electrode wiring 171 relative to the negative electrode wiring 172 is 12V. Therefore, the DC / DC converter 70 converts the voltage of 48V generated by the motor generator 2 into a voltage of 12V. As a result, the motor generator 2 can supply a voltage of 12V to the battery 80 via the DC / DC converter 70 to charge the battery 80.

[0026] Furthermore, the DC / DC converter 70 is electrically connected to the battery module 50 and the battery 80, and can perform charging and discharging between the battery module 50 and the battery 80 based on a control signal transmitted from the ECU 150. For example, the DC / DC converter 70 can discharge the battery module 50 and charge the battery 80 by converting the voltage and causing a constant current (e.g., 10 A) to flow from the battery module 50 to the battery 80. Alternatively, for example, the DC / DC converter 70 can discharge the battery 80 and charge the battery module 50 by converting the voltage and causing a constant current (e.g., 10 A) to flow from the battery 80 to the battery module 50.

[0027] The hybrid system 10 of this embodiment has the function of safely cutting off the electrical circuit that supplies power from the battery module 50 to the motor generator 2 when an abnormality occurs in the battery module 50 or when the entire hybrid system 10 is shut down.

[0028] For example, when the ignition switch is turned on, the ECU 150 transmits a control signal to the positive contactor 75 through a signal line 181 and executes control to close the positive contactor 75, thereby electrically connecting the positive wiring 174. The BMU 85 also executes control to close the negative contactor 76 based on a control signal transmitted from the ECU 150 through a signal line 193, thereby electrically connecting the negative wiring 175. This enables the battery module 50 to supply power to the motor generator 2.

[0029] On the other hand, for example, when the ignition switch is turned off, the ECU 150 transmits a control signal to the positive contactor 75 through a signal line 181 and executes control to open the positive contactor 75, thereby electrically cutting off the positive wiring 174. Also, the BMU 85 executes control to open the negative contactor 76 based on a control signal transmitted from the ECU 150 through a signal line 193, thereby electrically cutting off the negative wiring 175. As a result, the supply of power from the battery module 50 to the motor generator 2 is stopped.

[0030] Furthermore, when the BMU 85 detects, for example, an abnormality in the battery module 50, the ECU 150 transmits a first interruption signal R1 to the positive contactor 75 via a signal line 181 and executes control to open the positive contactor 75, thereby electrically interrupting the positive wiring 174. Furthermore, the BMU 85 transmits a second interruption signal R2 to the negative contactor 76 via a signal line 182 independently of a control signal transmitted from the ECU 150 and executes control to open the negative contactor 76, thereby electrically interrupting the negative wiring 175.

[0031] Alternatively, as described above, the ECU 150 and the BMU 85 communicate with each other and monitor each other's states. When the ECU 150 detects an abnormality in the BMU 85, the ECU 150 transmits a first interruption signal R1 to the positive contactor 75 via a signal line 181 and executes control to open the positive contactor 75, thereby electrically interrupting the positive wiring 174. On the other hand, when the BMU 85 detects an abnormality in the ECU 150, the BMU 85 transmits a second interruption signal R2 to the negative contactor 76 via a signal line 182 independently of a control signal transmitted from the ECU 150 and executes control to open the negative contactor 76, thereby electrically interrupting the negative wiring 175.

[0032] According to the hybrid system 10 described above, two contactors (in this embodiment, the positive electrode contactor 75 and the negative electrode contactor 76) are provided in an electric circuit (in this embodiment, the positive electrode wirings 173, 174 and the negative electrode wiring 175) that supplies electric power from the battery module 50 to the motor generator 2, and the ECU 150 controls the positive electrode contactor 75, and the BMU 85 controls the negative electrode contactor 76. Therefore, even if an abnormality occurs in the battery module 50 or in either the ECU 150 or the BMU 85, the hybrid system 10 according to this embodiment can cut off the electric circuit that supplies electric power from the battery module 50 to the motor generator 2. As a result, the hybrid system 10 can improve the safety of the battery module 50 that supplies electric power to the motor generator 2.

[0033] (Battery pack) FIG. 2 is an external perspective view illustrating the battery pack according to the present embodiment. FIG. 3 is a partially exploded perspective view illustrating the battery pack according to the present embodiment. FIG. 3 shows a state in which a housing cover 420 of a housing 400 of the battery pack 40 is open. The battery pack 40 includes a housing 400 that accommodates the battery module 50 and the BMU 85, which is a control circuit. The housing 400 includes a housing body 410 and a housing cover 420. The housing body 410 and the housing cover 420 are formed by casting using a metal material including aluminum, for example. A seal (not shown) is provided at the joint between the housing body 410 and the housing cover 420, and the inside of the housing 400 becomes watertight by covering the housing body 410 with the housing cover 420 and fastening and fixing it by, for example, screws. External terminals 451 and 452 are provided on the side surface of the housing body 410. The external terminals 451 and 452 are terminals that output the power of the battery pack 40 and a predetermined signal to the outside, and input signals from the ECU 150 or the like to the battery pack 40. If the external terminals 451 and 452 are provided so as to protrude laterally (for example, in the longitudinal direction) from the side surface of the housing body 410, this contributes to making the battery pack 40 thinner.

[0034] The housing main body 410 has a first storage section 411 that stores the battery module 50, and a second storage section 412 that stores the BMU 85, which is an example of a control circuit. In the housing main body 410, a partition section 415 is provided between the first storage section 411 and the second storage section 412. That is, one side of the partition section 415 becomes the first storage section 411, and the other side becomes the second storage section 412. By storing the battery module 50 in the first storage section 411 and storing the BMU 85 in the second storage section 412, the battery module 50 and the BMU 85 are separated from each other by the partition section 415 in the housing 400. It is preferable that the first storage section 411 is larger than the second storage section 412. Specifically, the distance from the side wall 410b (see FIG. 4) of the housing main body 140 to the partition wall 415 is longer than the distance from the side wall 410c (see FIG. 4) of the housing main body 410 to the partition wall 415. This allows more battery cells 510 to be accommodated in the first accommodating portion 411.

[0035] Due to the partitioning by the partition 415, even if the internal pressure in the first housing portion 411 rises, the partition 415 can suppress the influence of the rise in the internal pressure in the first housing portion 411 from reaching the second housing portion 412. For example, the battery cell 510 included in the battery module 50 is provided with a valve (safety valve) for releasing internal gas. This valve opens to release the gas when gas is generated inside the battery cell 510 due to an abnormality such as overcharging or internal short circuit of the battery cell 510 and the internal pressure exceeds a predetermined value. When the valve of the battery cell 510 is activated, the gas inside the battery cell 510 is released from the valve to the outside and into the housing 400. Since the housing 400 is configured in a watertight state, the internal pressure of the housing 400 rises rapidly due to the release of gas from the battery cell 510. A control circuit such as the BMU85 is provided with a large number of narrow-pitch and thin wiring and connector terminals, and therefore does not have high resistance to deformation or damage. Therefore, if the internal pressure of the housing 400 due to gas release from the battery cell 510 is transmitted to the control circuit, the wiring of the control circuit and the terminals of the connector may be deformed or damaged by the pressure.

[0036] In this embodiment, the housing 400 has a partition portion 415 provided between the first accommodating portion 411 that accommodates the battery module 50 and the second accommodating portion 412 that accommodates the control circuit. Therefore, even if the internal pressure of the first accommodating portion 411 suddenly increases due to gas release from the battery cell 510, the partition portion 415 can prevent the pressure from being transmitted to the second accommodating portion 412, making it easier to protect the control circuit accommodated in the second accommodating portion 412 from pressure.

[0037] The second housing section 412, which is partitioned from the first housing section 411 by the partition wall 415, may house the positive contactor 75 and the negative contactor 76 in addition to the control circuit. The second housing section 412 may also house a CMU 87, which is an example of a control circuit. This prevents the positive contactor 75 and the negative contactor 76 in addition to the control circuit from being affected by the increase in internal pressure in the first housing section 411. In other words, it is preferable to have a configuration in which circuits and connectors that are easily affected by pressure are housed in the second housing section 412. In particular, the battery cell 510 may be disposed in the first housing section 411, and all electronic components other than the battery cell 510 may be disposed in the second housing section 412, thereby effectively protecting the electronic components.

[0038] Furthermore, the number of partitions 415 is not limited to one, and the housing 400 may include multiple partitions 415. When multiple partitions 415 are included, a section in which the battery module 50 is accommodated becomes a first accommodating section 411, and a section in which the battery module 50 is not accommodated becomes a second accommodating section 412.

[0039] The partition wall 415 may be provided so as to surround the control circuit within the housing 400, or may be provided over the entire area between two opposing side walls of the housing main body 410. When the partition wall 415 is provided so as to surround the control circuit, the control circuit can be surrounded in a relatively narrow area, and is less susceptible to pressure changes outside the partition wall 415. Furthermore, when the partition wall 415 is provided over the entire area between two opposing side walls of the housing main body 410, the first storage section 411 and the second storage section 412 can be easily separated by the partition wall 415, and the partition wall 415 serves as a beam connecting the two side walls, thereby increasing the strength of the housing 400.

[0040] The partition wall 415 is preferably provided so as to reach from the bottom surface of the housing main body 410 to the ceiling surface 420a (see FIGS. 5 and 6) of the housing cover 420. This effectively prevents pressure from being transmitted from the first housing portion 411 to the second housing portion 412.

[0041] (Housing) FIG. 4 is an external perspective view illustrating an example of a housing main body of the housing according to the present embodiment. FIG. 5 is an external perspective view illustrating an example of a housing cover of the housing according to the present embodiment. FIG. 5 shows an external perspective view of housing cover 420 as seen from the ceiling surface 420a side. 4, housing body 410 is provided, for example, in a shallow dish shape. Housing body 410 has a bottom surface 410a and four side walls 410b-e provided around bottom surface 410a. Of the four side walls 410b-e, body side partition portion 4151 of partition section 415 is provided so as to span between two mutually opposing side walls 410d, 410e.

[0042] 5, a cover-side partition portion 4152 of partition portion 415 is provided on ceiling surface 420a of housing cover 420. Cover-side partition portion 4152 is provided at a position on ceiling surface 420a that faces main body-side partition portion 4151 when housing cover 420 is placed on housing main body 410. As a result, when housing cover 420 is attached to housing main body 410, main body-side partition portion 4151 and cover-side partition portion 4152 face each other and overlap with each other, forming one partition portion 415.

[0043] The housing cover 420 may include a vent valve 425 that opens when the internal pressure of the first storage portion 411 of the housing 400 reaches a predetermined pressure. The vent valve 425 is preferably provided so as to operate when gas is released from even one of the battery cells 510 included in the battery module 50. This allows an increase in internal pressure that does not occur in the first storage portion 411 to be quickly released, preventing the control circuit of the second storage portion 412 from being affected.

[0044] FIG. 6 is a schematic cross-sectional view illustrating a battery pack using the housing according to the present embodiment. FIG. 7 is an enlarged schematic cross-sectional view of the periphery of the partition shown in FIG. FIG. 8 is a partial perspective view illustrating the configuration around the partition wall. The first storage section 411 of the housing main body 410 stores the battery module 50, and the second storage section 412 stores the BMU 85, which is a control circuit. Between the battery module 50 and the BMU 85, a bus bar 200 is provided as a conductor for electrically connecting the battery module 50 and the BMU 85. The bus bar 200 is a metal (e.g., copper) plate material formed into a predetermined shape. In this embodiment, since a partition section 415 is provided between the first storage section 411 and the second storage section 412, the bus bar 200 is provided between the first storage section 411 and the second storage section 412 so as to cross the partition section 415. Note that, although the case where the bus bar 200 is used is exemplified in this embodiment, a conductor other than the bus bar 200 may be applied.

[0045] For example, recesses 201 are provided at positions where the bus bars 200 of the body-side partition portion 4151 and the cover-side partition portion 4152 intersect, respectively, and when the body-side partition portion 4151 and the cover-side partition portion 4152 are placed face to face with each other, the recesses 201 of both become holes provided in the partition portion 415. The holes correspond to the cross-sectional shape of the bus bars 200. The bus bars 200 are passed through the holes, so that the bus bars 200 intersect the partition portion 415. When the housing cover 420 is attached to the housing body 410, the holes are blocked by the bus bars 200. As a result, even if holes are formed in the partition portion 415 by the recesses 201, the path of pressure leakage between the first accommodation portion 411 and the second accommodation portion 412 is effectively blocked. The surface of bus bar 200 is covered with an insulating material (not shown), so that there is no electrical continuity between partition wall 415 and bus bar 200. A material with high sealing properties (such as a liquid gasket) may be interposed between bus bar 200 and partition wall 415.

[0046] In addition, when wiring other than the bus bar 200 (for example, wiring for transmitting a temperature sensor or a voltage detection signal provided in the battery module 50 to the BMU 85) needs to be passed between the first storage section 411 and the second storage section 412, a recess 202 (see FIG. 8) may be provided in the partition section 415. When the body side partition section 4151 and the cover side partition section 4152 are placed opposite each other and overlapped, the recess 202 becomes a through hole provided in the partition section 415. The wiring is passed between the first storage section 411 and the second storage section 412 through this through hole. Note that it is preferable to provide a sealant between the through hole and the wiring. This suppresses pressure leakage from the through hole of the partition section 415.

[0047] According to this embodiment, it is possible to provide a housing 400 and a battery pack 40 that can suppress the effect on the components inside the housing 400 even if an internal pressure increase occurs in the housing 400.

[0048] (Another embodiment) FIG. 9 is a block diagram showing a hybrid system according to another embodiment. 9, the hybrid system 10 may be configured to include one contactor 77. The contactor 77 is provided between the battery module 50 and the BMU 85. In the example shown in FIG. 9, the contactor 77 is provided between the negative terminal 52 of the battery module 50 and the BMU 85, but the contactor 77 may be provided between the positive terminal 51 of the battery module 50 and the BMU 85.

[0049] When the BMU 85 detects, for example, an abnormality in the battery module 50, the BMU 85 transmits a second cutoff signal R2 to the contactor 77 and executes control to open the contactor 77. This electrically cuts off the negative wiring 175, thereby ensuring the safety of the battery module 50.

[0050] The above describes the embodiments of the present invention. However, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the claims. For example, the configurations of the above embodiments can be partially omitted or arbitrarily combined in a manner different from the above. [Explanation of symbols]

[0051] 1...engine, 2...motor generator, 10...hybrid system, 40...battery pack, 50...battery module, 51...positive terminal, 52...negative terminal, 65...current value detection section, 67...temperature detection section, 70...DC / DC converter, 75...positive contactor, 76...negative contactor, 77...contactor, 80...battery, 81...positive terminal, 82...negative terminal, 85...BMU, 87...CMU, 100B...ground, 150...ECU, 171...positive wiring, 172...negative wiring, 173...positive wiring, 174...positive wiring, 175...negative wiring, 181...signal line, 182 ...signal line, 183...signal line, 191...signal line, 193...signal line, 200...bus bar, 201...recess, 202...recess, 400...housing, 410...housing main body, 410a...bottom surface, 410b...side wall, 410c...side wall, 410d...side wall, 410e...side wall, 411...first storage section, 412...second storage section, 415...partition wall portion, 420...housing cover, 420a...ceiling surface, 425...vent valve, 451...external terminal, 452...external terminal, 510...battery cell, 4151...main body side partition wall portion, 4152...cover side partition wall portion, R1...first cutoff signal, R2...second cutoff signal

Claims

1. A housing for a battery pack mounted in a hybrid system, comprising: a housing main body having a first storage section that stores a battery module that supplies electric power to a motor generator of the hybrid system, and a second storage section that stores a control circuit for the battery module; a housing cover attached to the housing body; a partition wall portion provided between the first accommodating portion and the second accommodating portion in the housing main body, the partition wall portion separating a space of the first accommodating portion from a space of the second accommodating portion; A housing for a battery pack comprising:

2. The housing of a battery pack according to claim 1 , wherein the partition portion is provided so as to extend from a bottom surface of the housing body to a ceiling surface of the housing cover.

3. 3. The housing of a battery pack according to claim 1, wherein the partition portion is provided over an entire area between two opposing side walls of the housing body.

4. the partition wall portion has a body-side partition wall portion provided on the housing body side and a cover-side partition wall portion provided on the housing cover side, 4. The housing of a battery pack according to claim 3, wherein when the housing cover is attached to the housing main body, the body-side partition wall portion and the cover-side partition wall portion face each other to form the partition wall portion.

5. The housing of the battery pack according to claim 3 , wherein the housing cover is provided with a vent valve that opens when the internal pressure of the first storage portion reaches a predetermined pressure.

6. The housing body is provided in a shallow dish shape, the first accommodating portion and the second accommodating portion are arranged side by side along a bottom surface of the housing body, The housing of the battery pack according to claim 1 , wherein the housing cover is provided so as to cover the first storage portion and the second storage portion as a whole.

7. A battery pack housing according to any one of claims 1 to 6, The control circuit includes a battery management unit (BMU) that controls an overall voltage of the battery module.

8. A bus bar is further provided to electrically connect the battery module and the control circuit. The battery pack according to claim 7 , wherein the bus bar is provided between the first housing portion and the second housing portion so as to cross the partition portion.

9. a contactor that opens and closes wiring provided between the battery module and the motor generator; The battery pack according to claim 7 , wherein the contactor is accommodated in the second accommodation portion.

Images