CN111133604B

CN111133604B - Battery pack

Info

Publication number: CN111133604B
Application number: CN201880055943.0A
Authority: CN
Inventors: 圆冈和典
Original assignee: Envision Aesc Energy Components Co ltd
Current assignee: Envision Aesc Energy Components Co ltd
Priority date: 2017-09-01
Filing date: 2018-03-20
Publication date: 2023-06-13
Anticipated expiration: 2038-03-20
Also published as: JP7097898B2; CN111133604A; WO2019044010A1; JPWO2019044010A1

Abstract

The present invention relates to a battery pack including: a case (100) which houses a battery covered with a waterproof bag; a cable (220) having one end electrically connected to the battery and the other end led out from the opening of the waterproof bag to the outside of the housing; a case opening (105) which is formed continuously in the case from a position of the case corresponding to a start position of extraction of the other end of the outgoing cable to the outside of the case to a position of the case corresponding to a start position of extraction of the outgoing cable from the opening of the waterproof bag; a member (510) that blocks a gap between an inner surface of the housing opening and the outer skin of the cable; and a member (520) that blocks a gap between an inner surface of the opening of the case and an outer edge of the opening of the waterproof bag.

Description

Battery pack

Technical Field

The present invention relates to a battery pack.

Background

The battery pack is widely used for electric tools, electric auxiliary bicycles, electric motorcycles, hybrid electric vehicles, unmanned aerial vehicles (unmanned aerial vehicles), and the like. In addition, the battery pack is also used for electric storage in homes, shops, and the like. In these various applications, the battery pack is sometimes used outdoors. Therefore, the battery pack needs to have a structure that protects the battery cells located within the battery pack from water penetration.

As an example of a structure for preventing water from entering the battery pack, a structure is known in which the battery pack, which is an aggregate of a plurality of battery cells, is housed in a waterproof bag made of resin and the opening is closed. Patent document 1 discloses a battery pack in which an opening of a waterproof bag for housing a battery core pack is sealed in a liquid-tight manner using a cable sheath and a binding material. Patent document 2 discloses a battery module in which a sealing member is fitted into a cable-drawing through hole provided in the battery module to ensure water resistance. The cable lead-out through hole is a hole for connecting the other end side of the cable connected to the electrode terminal of the battery cell housed in the battery module to an external device and leading out the cable.

Here, the structure of the battery pack will be briefly described. The assembled battery is produced through the following steps. First, positive electrode and negative electrode are alternately laminated with a separator interposed therebetween. The battery element (laminated structure) is produced by lamination. Next, the battery element (laminated structure) is sealed with the electrolyte by laminating the laminate package. Then, a plurality of battery cells (unit cells) sealed with a laminate exterior are stacked. Then, a plurality of battery cells (unit cells) are stacked to generate a assembled battery. The battery pack has the assembled battery within the assembly.

The assembled battery produced in such a process uses a lithium ion secondary battery as a single battery. It is known that a nonaqueous electrolyte solution reacts with a negative electrode active material to decompose at the time of initial charge, and a gas is generated. If the gas exists between the electrodes, a phenomenon such as an increase in the internal resistance of the lithium ion secondary battery occurs. Further, the battery capacity decreases due to an increase in internal resistance of the lithium ion secondary battery or the like. As a result, battery characteristics such as cycle characteristics may be reduced. In particular, in a lithium ion secondary battery using a film outer case, the battery characteristics tend to be significantly degraded. In order to prevent degradation of battery characteristics due to the generation of such gas, the following measures are taken in such a battery pack.

For example, when gas is generated from the unit cells, the battery pack includes a gas discharge mechanism that discharges the gas to the outside of the battery pack. The gas discharge mechanism has a function of discharging gas generated inside the battery pack to the outside of the battery pack. The gas discharge mechanism also has a function of preventing water from entering from the outside of the battery pack. The battery pack further includes a gas absorbing material inside the battery pack for absorbing gas generated from the unit cells.

Prior art literature

Patent literature

Patent document 1: japanese patent laid-open No. 2007-317579

Patent document 2: japanese patent laid-open publication 2016-171028

Disclosure of Invention

Problems to be solved by the invention

In order to prevent water from entering the battery pack, the opening of the waterproof bag is sealed at one place with a cable sheath or a binding material, so that a gap between the waterproof bag and the lead (cable) is sealed. In contrast, the gas discharge mechanism has a structure in which a hole is temporarily formed in the assembled battery, and a gas discharge valve is provided at this position. Therefore, it is effective to provide the gas discharge mechanism at the opening of the waterproof bag, which is the boundary between the inside and the outside of the battery pack, in order to achieve both the waterproof function and the gas discharge function. However, the structure of closing the opening of the waterproof bag with the cable sheath or the binding material has the following problems. There is a problem in that there is no space for installing the gas discharge mechanism at the boundary between the inside and the outside of the battery pack, that is, at the opening of the waterproof bag. Therefore, the gas discharge mechanism has to be provided in an area other than the opening of the waterproof bag. This situation is similar to the case where the sealing member is filled in the lead-out through-hole of the cable in the state where the battery cell is housed in the battery module. Therefore, the gas discharge means is provided in a hole in a portion other than the opening of the waterproof bag. Therefore, there is a problem in that the waterproof function is deteriorated by the hole forming method.

In view of the above problems, an object of the present invention is to provide a battery pack that solves the problem of providing a new mechanism that combines a waterproof function and a gas discharge function.

Means for solving the problems

The battery pack of the present invention comprises: a case accommodating the battery covered by the waterproof bag; a cable that electrically connects one end side to the battery and that leads the other end side from the opening of the waterproof bag to the outside of the case; a case opening portion formed continuously in the case from a first position of the case, which corresponds to a drawing start position at which the other end side of the cable is drawn out toward the outside of the case, to a second position of the case, which corresponds to a drawing start position at which the other end side of the cable is drawn out from the opening portion of the waterproof bag; a first member that blocks a gap between an inner surface of the housing opening and a sheath of the cable at the first position; and a second member that blocks a gap between an inner surface of the housing opening and an outer edge of the opening of the waterproof bag at the second position.

Effects of the invention

According to the present invention, a battery pack having a new mechanism that combines both a waterproof function and a gas discharge function can be provided.

Drawings

Fig. 1 is a perspective view schematically showing an external appearance of an example of a battery pack.

Fig. 2 is a perspective view schematically showing an assembled battery and a cable housed in a case in a state in which one of the cases of the battery pack shown in fig. 1 is removed.

Fig. 3 is a perspective view schematically showing an example of a state before the assembled battery constituting the battery pack of the first embodiment and the second embodiment is put into the waterproof bag.

Fig. 4 is a perspective view schematically showing an example of a state in which assembled batteries constituting the battery packs of the first and second embodiments are put into a waterproof bag.

Fig. 5 is a perspective view schematically showing an example of a state in which the upper case and the lower case are combined and the assembled battery after being put in the waterproof bag is stored to form the assembled battery of the first embodiment.

Fig. 6 is a plan view showing an example of a state in which the assembled battery of the first embodiment is viewed from the stacking direction of the unit cells through the upper case.

Fig. 7 is an enlarged perspective view of a portion a of fig. 6.

Fig. 8 is a perspective view schematically showing an example of a state in which the upper case and the lower case are combined and the assembled battery after being put in the waterproof bag is stored to form the battery pack of the second embodiment.

Fig. 9 is a plan view showing an example of a state in which the assembled battery of the second embodiment is viewed from the stacking direction of the unit cells through the upper case.

Fig. 10 is a perspective view schematically showing an external appearance of an example of the battery pack of the second embodiment.

Fig. 11 is a perspective view schematically showing an appearance of a lower case of an example of a battery pack according to the second embodiment in a state of being removed.

Fig. 12 is an X-X' cross-sectional view of fig. 10.

Fig. 13 is a diagram illustrating a main part of an example of the battery pack according to the third embodiment.

Detailed Description

First, before explaining an embodiment of the present invention, an example of a battery pack will be described with reference to fig. 1 and 2. Fig. 1 is a perspective view schematically showing an external appearance of an example of a battery pack. Fig. 2 is a perspective view schematically showing an assembled battery and a cable housed in a case in a state in which one of the cases of the battery pack shown in fig. 1 is removed.

The assembled battery 1000 accommodates at least an assembled battery in which a plurality of unit cells 1 are laminated and each of which is covered with a sheet of flexible film, and a protective circuit board in the case 100. The housing 100 can be formed by combining a pair of first and

second cases

101 and 102.

The housing 100 has an opening 450. Through the opening 450, the other end of the power cable 200, one end of which is connected to the assembled battery, is led out from the inside of the housing 100. A signal cable (hereinafter, also referred to as a sense line) 300, one end of which is connected to each of the cells 1 and monitors the state of each of the cells 1, is led out from the inside of the case 100 to the outside through the opening 450. The power cable 200 has two

cables

220, 230 having polarities different from each other. The sensor line 300 is a signal line capable of outputting the voltage, current, temperature, and other states of the single battery 1.

The other end sides of the

cables

220 and 230 are connected to the connector 250. The other end side of the sensor wire 300 is connected to a connector 350.

The assembled battery is covered by a waterproof pouch 400. The other end side of the power cable 200 and the other end side of the sensor wire 300 are taken out from the opening 401 of the waterproof bag 400 and led out of the housing 100.

Next, an embodiment of the present invention will be described with reference to the drawings.

(first embodiment)

First, a schematic structure of a battery pack according to a first embodiment of the present invention will be described with reference to fig. 3 to 5. Fig. 3 is a perspective view schematically showing an example of a state before an assembled battery constituting the assembled battery of the first embodiment is put into a waterproof bag.

As shown in fig. 3, a battery pack 1001 (fig. 5) of the first embodiment includes an assembled battery 10 in which a plurality of unit cells 1 wrapped with a sheet of flexible film are stacked. Fig. 3 shows a state in which seven unit cells 1 are stacked. However, the number of stacked unit cells 1 is not limited to seven, and may be any number.

One end side of the

cables

220, 230 and one end side of the sensing wire 300 are electrically connected to the

electrode terminals

21, 22 of the assembled battery 10. The other end sides of the

cables

220, 230 are electrically connected to the connector 250. The other end side of the sensor wire 300 is electrically connected to the connector 350.

The waterproof bag 400 has a substantially rectangular parallelepiped shape and covers the assembled battery 10. The waterproof bag 400 has an opening 401 for leading out the other end side of the power cable 200 and the other end side of the sensor wire 300 to the outside of the waterproof bag 400. When the assembled battery 10 is covered with the waterproof bag 400, the state shown in fig. 4 is obtained. Fig. 4 is a perspective view schematically showing an example of a state in which assembled batteries constituting the battery packs of the first and second embodiments are put into a waterproof bag.

Next, as shown in fig. 5, the assembled battery 10 covered with the waterproof bag 400 is assembled using a first case (hereinafter, also referred to as an upper case) 101 and a second case (hereinafter, also referred to as a lower case) 102. Thereby, the casing 100 accommodates the assembled battery 10 covered with the waterproof bag 400. Fig. 5 is a perspective view schematically showing an example of a state in which the battery pack of the first embodiment is formed by assembling the upper case 101 and the lower case 102 and housing the assembled battery after the waterproof bag is put in.

As shown in fig. 5, the upper case 101 and the lower case 102 have a case opening 105. Specifically, the upper case 101 and the lower case 102 have the case opening 105 from the extraction start position (S) at the other end side of the power cable 200 and the sensor wire 300 extracted from the opening 401 of the waterproof bag 400 to the extraction start position (E) at the other end side of the power cable 200 and the sensor wire 300 extracted to the outside of the case 100. That is, the case opening 105 is formed by combining the upper case tubular portion 1011 of the upper case 101 and the lower case tubular portion 1021 of the lower case 102. The opening 401 of the waterproof bag 400 is disposed in the space of the housing opening 105.

The upper case tubular portion 1011 has an upper case sealing portion 501 at a position of the case opening 105 corresponding to a drawing start position (E) of the other end side of the power cable 200 and the sensor wire 300 drawn from the case 100 to the outside. The upper case tubular portion 1011 has an upper case sealing portion 503 at a position of the case opening 105 corresponding to a drawing start position (S) of the power cable 200 and the sensor wire 300 from the opening 401 of the waterproof bag 400.

Similarly, the lower case tube section 1021 has a lower case seal section 502 at the case opening section 105 corresponding to the extraction start position (E) of the other end side of the power cable 200 and the sensor wire 300 extracted from the case 100 to the outside. The lower case tube section 1021 has a lower case seal section 504 at the case opening section 105 corresponding to the extraction start position (S) of the other end side of the power cable 200 and the sensor wire 300 extracted from the opening section 401 of the waterproof bag 400.

That is, as shown in fig. 7, the case opening 105 is a space closed by using an outer seal 551 including the upper case seal 501 and the lower case seal 502, an inner seal 552 including the upper case seal 503 and the lower case seal 504, and an inner surface of the case opening 105. This point will be described later.

The case opening 105 will be further described with reference to fig. 6. Fig. 6 is a plan view showing an example of a state in which the assembled battery of the first embodiment is viewed from the stacking direction of the unit cells through the upper case. In fig. 6, the view is through the upper case 101. Accordingly, the housing opening 105 includes a lower housing tubular portion 1021, a lower housing seal portion 502, and a lower housing seal portion 504. The opening 401 of the waterproof bag 400 is disposed in the space of the housing opening 105.

Next, the outer seal 551 and the inner seal 552 will be described with reference to fig. 7. Fig. 7 is an enlarged perspective view of a portion a of fig. 6. As shown in fig. 7, the case opening 105 is closed by the outer seal 551 and the inner seal 552. The outer seal 551 seals the gap between the inner surface of the case opening 105 and the outer skin of the power cable 200 or the sensor wire 300. The inner seal 552 seals the gap between the inner surface of the case opening 105 and the outer edge of the opening 401 of the waterproof bag 400. The outer seal 551 may be made of any material as long as it is a member that closes the gap between the inner surface of the case opening 105 and the outer skins of the power cable 200 and the sensor wire 300. The inner seal 552 may be made of any material as long as it is a member that closes the gap between the inner surface of the case opening 105 and the outer edge of the opening 401 of the waterproof bag 400.

The case opening 105 may have a gas discharge mechanism for discharging the gas generated from the unit cell 1 to the outside of the battery assembly 1001. Thus, the case opening 105 has the following functions. One is a function of preventing water from being immersed from the outside of the battery 1001. The other is a function of discharging gas generated inside the battery 1001 to the outside of the battery 1001. Both functions can be combined. The case opening 105 may have a gas absorbing material that absorbs the gas generated from the unit cell 1.

In the present embodiment, the outer seal 551 is formed using the upper case seal 501 and the lower case seal 502 which are substantially semicircular. In the present embodiment, the inner seal 552 is formed using the upper case seal 503 and the lower case seal 504 which are substantially semicircular. However, instead of forming the outer seal 551 and the inner seal 552 using a plurality of members, the outer seal 551 and the inner seal 552 may be formed using a single member. For example, the upper housing tubular portion 1011 may be provided with a substantially circular outer seal portion 551, and the lower housing tubular portion 1021 may be provided with a substantially circular inner seal portion 552, or vice versa.

As described above, in the present embodiment, in the case 100, the continuous case opening 105 is formed from the extraction start position (S) extracted from the opening 401 of the waterproof bag 400 in the other end side of the power cable 200 having one end side connected to the

electrodes

21, 22 of the assembled battery 10 to the extraction start position (E) extracted from the case 100 in the other end side of the power cable 200. The housing opening 105 forms a closed space using the outer seal 551, the inner seal 552, and the inner surface of the housing opening 105. The outer seal 551 seals the gap between the inner surface of the case opening 105 and the outer skin of the power cable 200 or the sensor wire 300. The inner seal 552 seals the gap between the inner surface of the case opening 105 and the outer edge of the opening 401 of the waterproof bag 400. The case opening 105 may have a gas discharge mechanism for discharging the gas generated from the unit cell 1 to the outside of the battery assembly 1001. Thus, the case opening 105 has the following functions. One is a function of preventing water from being immersed from the outside of the battery 1001. The other is a function of discharging gas generated inside the battery 1001 to the outside of the battery 1001. Both functions can be combined.

(second embodiment)

Next, a schematic structure of a battery pack according to a second embodiment of the present invention will be described with reference to fig. 3, 4, and 8. In fig. 3 and 4, the battery pack according to the first embodiment is the same as that of the battery pack according to the first embodiment, and therefore, detailed description thereof is omitted.

As shown in fig. 8, the assembled battery 10 covered with the waterproof bag 400 is assembled using the upper case 101 and the lower case 102. Thereby, the casing 100 accommodates the assembled battery 10 covered with the waterproof bag 400. Fig. 8 is a perspective view schematically showing an example of a state in which the upper case 101 and the lower case 102 are combined and the assembled battery after being put in the waterproof bag is stored to form the battery pack of the second embodiment.

Although not explicitly shown in fig. 8, in the present embodiment, as described with reference to fig. 5 of the first embodiment, a continuous housing opening 105 is formed in the housing 100 from a position corresponding to a drawing start position (S) at which the other end side of the power cable 200 or the sensor wire 300 is drawn out from the opening 401 of the waterproof bag 400 to a position corresponding to a drawing start position (E) at which the other end side of the power cable 200 or the sensor wire 300 is drawn out from the housing 100. The same applies to the first embodiment, in which the case opening 105 is formed by combining the upper case tubular portion 1011 of the upper case 101 and the lower case tubular portion 1021 of the lower case 102.

In the present embodiment, a tubular member (hereinafter, also referred to as a tubular member) 500 having an outer peripheral surface facing and abutting an inner peripheral surface of the housing opening 105 is disposed in a space of the housing opening 105. The tubular member 500 has an outer seal 551 at a position of the housing opening 105 corresponding to the extraction start position (E) of the other end side of the power cable 200 and the sensor wire 300 from the housing 100. The tubular member 500 has an inner seal 552 at a position of the housing opening 105 corresponding to a start position (S) of the power cable 200 and the sensor wire 300 at the other end side of the waterproof bag 400. That is, as shown in fig. 12, the case opening 105 is a space closed by the outer seal 551, the inner seal 552, and the inner surface of the tubular member 500. This point will be described later.

The case opening 105 and the tubular member 500 will be further described with reference to fig. 9. Fig. 9 is a plan view showing an example of a state in which the assembled battery of the second embodiment is viewed from the stacking direction of the unit cells through the upper case. In fig. 9, the upper case 101 is seen through. Accordingly, the housing opening 105 includes a lower housing tubular portion 1021, an outer seal portion 551 and an inner seal portion 552 of the tubular member 500. The opening 401 of the waterproof bag 400 is disposed in the space of the tubular member 500 disposed in the space of the housing opening 105.

The tubular member 500, the outer peripheral surface of which is in contact with the inner peripheral surface of the housing opening 105 while being opposed thereto, forms a closed space by using the outer seal 551, the inner seal 552, and the inner peripheral surface of the tubular member 500. The outer seal 551 seals the gap between the inner surface of the tubular member 500 and the outer skins of the power cable 200 and the sensor wire 300. The inner seal 552 seals the gap between the inner surface of the tubular member 500 and the outer edge of the opening 401 of the waterproof bag 400.

Next, the appearance of the battery pack according to the second embodiment and the appearance of the state in which the lower case is removed will be described. Fig. 10 is a perspective view schematically showing an external appearance of an example of the battery pack of the second embodiment. Fig. 11 is a perspective view schematically showing an external appearance of a state in which a casing is removed in an example of a battery pack according to the second embodiment. In fig. 10 and 11, the upper housing tubular portion 1011 and the lower housing tubular portion 1021 are omitted.

The basic structure of the battery pack 1002 according to the present embodiment is the same as that described above with reference to fig. 1 and 2. In the present embodiment, as shown in fig. 10 and 11, an outer seal 551 is provided at a position of the tubular member 500 corresponding to a start position of the other end of the power cable 200 and the sensor wire 300, which is drawn out from the housing 100. In the present embodiment, although not shown in fig. 10 and 11, an inner seal 552 is provided at a position of the tubular member 500 corresponding to a start position of the power cable 200 and the sensor wire 300 at the other end side of the power cable drawn out from the opening 401 of the waterproof bag 400. The outer seal 551 seals the gap between the inner surface of the tubular member 500 and the outer skins of the power cable 200 and the sensor wire 300. Although not shown in fig. 10 and 11, the inner seal 552 seals the gap between the inner surface of the tubular member 500 and the outer edge of the opening 401 of the waterproof bag 400.

Next, the internal structure of the tubular member 500 will be described with reference to fig. 12. Fig. 12 is an X-X' cross-sectional view of fig. 10. As shown in fig. 12, in the case 100, the case opening 105 is continuously formed from a position corresponding to the extraction start position (E) extracted from the case 100 on the other end side of the power cable 200 to a position corresponding to the extraction start position (S) extracted from the opening 401 of the waterproof bag 400 on the other end side of the power cable 200. The tubular member 500 is disposed in the space of the housing opening 105. As a result, the tubular member 500 forms a closed space using the outer seal 551, the inner seal 552, and the inner surface of the tubular member 500.

As shown in fig. 12, the other end side of the power cable 200 led out from the opening 401 of the waterproof bag 400 is led out to the outside of the casing 100 through the inner surface of the tubular member 500. The outer seal 551 seals the gap between the inner surface of the tubular member 500 and the outer sheath of the power cable 200. The inner seal 552 seals the gap between the inner surface of the tubular member 500 and the outer edge of the opening 401 of the waterproof bag 400.

In the present embodiment, the tubular member 500 may have a gas discharge mechanism for discharging the gas generated from the unit cell 1 to the outside of the assembled battery 1002. Thereby, the tubular member 500 has the following functions. One is a function of preventing water from being immersed from the outside of the battery pack 1002. The other is a function of discharging gas generated inside the battery pack 1002 to the outside of the battery pack 1002. Both functions can be combined. In addition, the tubular member 500 may also have a gas absorbing material that absorbs the gas generated from the unit cell 1.

As described above, in the present embodiment, one end of the power cable 200 is connected to the

electrodes

21 and 22 of the assembled battery 10. In addition, in the case 100, a continuous case opening 105 is formed from a drawing start position (S) drawn from the opening 401 of the waterproof bag 400 in the other end side of the power cable 200 to a drawing start position (E) drawn from the case 100 in the other end side of the power cable 200. The inner surface of the tubular member 500, the outer seal 551, and the inner seal 552, the outer peripheral surface of which faces and abuts the inner peripheral surface of the housing opening 105, are used to form a closed space. The outer seal 551 seals the gap between the inner surface of the tubular member 500 and the outer skins of the power cable 200 and the sensor wire 300. The inner seal 552 seals the gap between the inner surface of the tubular member 500 and the outer edge of the opening 401 of the waterproof bag 400. The tubular member 500 may also have a gas discharge mechanism for discharging the gas generated from the unit cell 1 to the outside of the assembled battery 1002. Thereby, the tubular member 500 has the following functions. One is a function of preventing water from being immersed from the outside of the battery pack 1002. The other is a function of discharging gas generated inside the battery pack 1002 to the outside of the battery pack 1002. Both functions can be combined.

In the above two embodiments, the dimensions in the longitudinal direction of the power cable 200 of the housing opening 105 and the tubular member 500 may be set as follows. That is, the length may be set to any length from the drawing start position (E) at which the power cable 200 is drawn out of the casing 100 to the drawing start position (S) at which the power cable 200 is drawn out of the opening 401 of the waterproof bag 400.

In the above two embodiments, the unit cell 1 was described with respect to a lithium ion secondary battery among chargeable and dischargeable secondary batteries. However, the single cell 1 may be a nickel-metal hydride battery or a nickel-cadmium battery. In the above two embodiments, the assembled

batteries

1001 and 1002 are described as the unit cells 1 by taking as an example a laminated battery in which battery elements (laminated structure) and an electrolyte are sealed together by laminating and exterior. However, the shape of the single cell 1 may be any shape such as a cylindrical cell or a prismatic cell.

In the above two embodiments, the assembled battery 10 is shown in a state in which seven single batteries 1 are stacked. However, the number of stacked unit cells 1 is not limited to seven, and may be any number.

(third embodiment)

Next, a battery pack according to a third embodiment of the present invention will be described with reference to fig. 13. Fig. 13 is a diagram illustrating a main part of an example of the battery pack according to the third embodiment.

The battery pack 1003 of the present embodiment includes a case 100, a cable 220, a case opening 105, a first member 510, and a second member 520.

The case 100 accommodates the battery 11 covered with the waterproof bag 400. One end side of the cable 220 is electrically connected to the battery 11. The other end side of the cable 220 is led out from the opening 401 of the waterproof bag 400 to the outside of the housing 100.

The case opening 105 is formed at the following position. That is, the first position of the housing 100 corresponding to the extraction start position at which the other end side of the cable 220 is extracted toward the outside of the housing 100 is formed to the second position of the housing 100 corresponding to the extraction start position at which the other end side of the cable 220 is extracted from the opening 401 of the waterproof bag 400. The case opening 105 is continuously formed in the case 100.

The first member 510 blocks a gap between an inner surface of the housing opening 105 and the outer skin of the cable 220 at the first position of the housing 100. The second member 520 blocks a gap between the inner surface of the case opening 105 and the outer edge of the opening 401 of the waterproof bag 400 at the second position of the case 100.

In the present embodiment, the case opening 105 is formed at the following position. That is, the first position of the housing 100 corresponding to the extraction start position of the cable 220 extracted from the housing 100 on the other end side is formed to the second position of the housing 100 corresponding to the extraction start position of the cable 220 extracted from the opening 401 of the waterproof bag 400 on the other end side. And, a gap between the inner surface of the case opening 105 and the outer skin of the cable 220 is sealed using the first member 510 at the first position of the case 100. In addition, a gap between the inner surface of the case opening 105 and the outer edge of the opening 401 of the waterproof bag 400 is sealed using the second member 520 at the second position of the case 100. The case opening 105 may also have a gas discharge mechanism for discharging the gas generated from the unit cell 1 to the outside of the battery pack 1003. This can provide the assembled battery 1003 having a new mechanism for both the waterproof function and the gas discharge function.

In the above embodiment, the case opening 105 is continuously formed in the case 100. However, for example, the same effect can be obtained if the first member 510 and the second member 502 are configured to be housed in the opening 401 of the waterproof bag 400 for housing the battery 11 in the tube through which the cable 220 passes and to seal the openings at both ends of the tube.

The present invention has been described above with reference to the embodiments, but the present invention is not limited to the above embodiments. The structure and details of the present invention can be variously modified within the scope of the present invention as will be understood by those skilled in the art.

The present application claims priority based on japanese patent application publication No. 2017-168828 filed on 1/9/2017, the disclosure of which is incorporated herein in its entirety.

Reference numerals illustrate:

1. single battery

10. Assembled battery

21. 22 electrode

100. Outer casing

101. First shell body

102. Second shell

105. Opening of casing

200. Power cable

220. 230 cable

250. 350 connector

300. Sensing wire

400. Waterproof bag

401. 450 opening part

500. Tubular member

501. 503 upper housing seal portion

502. 504 lower housing seal section

510. First component

520. Second component

551. Outside sealing part

552. Inner seal part

1000. 1001, 1002, 1003 battery pack

1011. Tubular part of upper shell

1021. A lower housing tubular portion.

Claims

1. A battery pack, wherein,

the battery pack has:

a tube through which the cable passes;

a waterproof bag that accommodates a battery connected to one end of the cable; and

a sealing member which accommodates the opening of the waterproof bag in the tube and seals the openings at both ends of the tube,

the sealing member includes an inner sealing portion that seals a gap between an inner surface of the tube and an outer edge of the opening of the waterproof bag, and an outer sealing portion that seals a gap between the inner surface of the tube and the outer skin of the cable.

2. A battery pack, wherein,

the battery pack is provided with:

a case accommodating the battery covered by the waterproof bag;

a cable that electrically connects one end side to the battery and that leads the other end side from the opening of the waterproof bag to the outside of the case;

a case opening portion formed continuously in the case from a first position of the case, which corresponds to a drawing start position at which the other end side of the cable is drawn out toward the outside of the case, to a second position of the case, which corresponds to a drawing start position at which the other end side of the cable is drawn out from the opening portion of the waterproof bag;

a first member that blocks a gap between an inner surface of the housing opening and a sheath of the cable at the first position; and

and a second member that blocks a gap between an inner surface of the housing opening and an outer edge of the opening of the waterproof bag at the second position.

3. The battery pack according to claim 2, wherein,

the opening of the waterproof bag is disposed in a space surrounded by the first member, the second member, and the inner surface of the housing opening.

4. The battery pack according to claim 3, wherein,

the battery pack further includes a tubular member having an outer peripheral surface abutting an inner peripheral surface of the case opening, and the space is surrounded by the inner surface of the tubular member, the first member, and the second member.

5. The battery pack according to claim 3 or 4, wherein,

the space is filled with a gas absorbing material.

6. The battery pack of claim 4, wherein,

the tubular member has a gas evacuation mechanism.

7. The battery pack according to claim 2 or 3, wherein,

the housing also houses a circuit substrate electrically connected to the battery.