JP6308289B2 - Battery module and battery pack - Google Patents

Description

  The present invention relates to a battery module and a battery pack.

The battery module is provided with a wiring for connecting members constituting the battery module and a temperature sensor for measuring the temperature of the battery cell (for example, see Patent Document 1).
In the secondary battery device described in Patent Document 1, a cell unit in which a plurality of battery cells are connected in parallel is housed in a center case. The thermistor is provided in the battery cell provided in the position where the temperature becomes highest among the plurality of battery cells and the battery cell provided in the position where the temperature becomes lowest. On the side wall of the center case, an elongated belt-like groove is formed on the inner surface of the side wall facing the battery cell to which the thermistor is attached. The thermistor is accommodated in the groove.

JP 2012-38468 A

By the way, when vibration is applied to the secondary battery device, the thermistor may come out of the groove.
The objective of this invention is providing the battery module and battery pack which can suppress that a thermistor or wiring pulls out from an accommodating part.

  The battery module that solves the above problem includes a plurality of battery cells, and a battery holder that is provided for each of the plurality of battery cells and holds the battery cells, and the battery cells in a state of being held by the battery holder The battery holder is provided with an accommodating portion having an opening at least in part, and the thermistor is accommodated in the accommodating portion, and is disposed opposite to the opening. The gist is that the thermistor is restrained by the restrained member.

  When providing a storage part in a battery holder, the opening part is provided for the purpose of storing the thermistor in the storage part or for checking the storage state after storing the thermistor in the storage part. If vibration or the like is applied to the battery module in a state where the opening is not closed, the thermistor may come out of the housing portion from the housing portion. As a result, the thermistor cannot measure the temperature of the battery cell. By restraining the thermistor with the restraining member, it is difficult for the thermistor to come out of the housing portion even if vibration is applied to the battery module.

  A battery module that solves the above problem includes a plurality of battery cells and a battery holder that is provided for each of the battery cells and holds the battery cells, and the battery cells in a state of being held by the battery holder are a plurality of battery cells. The battery holders are arranged side by side, and the battery holder is provided with a housing part having an opening part at least in part, wiring is housed in the housing part, and is arranged to face the opening part. The gist is that the wiring is restrained by the restraining member.

  When providing a storage part in a battery holder, the opening part is provided for the purpose of storing a wiring in a storage part, or confirming a storage state after storing a wiring in a storage part. If vibration or the like is applied to the battery module in a state where the opening is not closed, the wiring may come out of the housing portion from the housing portion. As a result, it causes disconnection. By restraining the wiring with the restraining member, it is difficult for the wiring to come out of the housing portion even if vibration is applied to the battery module.

  A battery pack that solves the above-described problems is a battery pack that includes a battery module that includes the battery holder described above and a case that houses the battery module, and the opening portion of the battery module includes the restraining member. It is accommodated in the case in a state of being closed by the battery, and the restraining member is a module constituent member that constitutes the battery module.

  In the battery pack, the restraining member is a duct through which gas discharged from the battery cell passes, and the opening is housed in the case in a state of being closed by an outer surface of the duct.

  In the battery pack, the case includes a plurality of the battery modules stacked in a vertical direction, and the restraining member is the battery holder of the battery module stacked right above.

  With respect to the battery pack, the battery holder includes a battery housing portion in which the battery cell is housed, and a columnar leg portion extending vertically downward from the battery housing portion, and the leg portion is stacked immediately below. The opening of the battery module is closed.

  According to the present invention, it is possible to prevent the thermistor or the wiring from coming out of the accommodating portion.

The perspective view which shows the battery pack of embodiment. The perspective view which shows the battery module of embodiment. The perspective view of the battery holder and square battery of embodiment. (A) is a perspective view which shows the accommodating part of embodiment, (b) is the 4-4 sectional view taken on the line of (a). Sectional drawing which shows the battery module of embodiment. Sectional drawing which expands and shows the site | part enclosed by the code | symbol A shown in FIG. Sectional drawing which shows the battery module of another example.

Hereinafter, an embodiment of the battery module will be described.
As shown in FIG. 1, the battery pack 10 has a battery module 20 accommodated in a case 11. In the present embodiment, three battery modules 20 are stacked.

  As shown in FIGS. 2 and 3, the battery module 20 includes a rectangular battery 21 as a battery cell (for example, a secondary battery such as a lithium ion secondary battery or a nickel hydride storage battery), and a battery holder 30 made of a resin. Are arranged side by side in a state of being held in In the battery module 20, end plates 22 are provided at both ends of the prismatic battery 21 in the juxtaposition direction.

  Bolts B are inserted through the end plates 22 and the battery holders 30. The bolt B is inserted from one end plate 22 toward the other end plate 22 and is screwed to the nut N on the other end plate 22 side. A bracket 24 is fixed to each end plate 22. The battery module 20 is fixed to the side wall of the case 11 by fixing the bracket 24 to the side wall of the case 11.

  As shown in FIG. 3, the battery holder 30 has a first covering portion 31 having a rectangular flat plate shape. At both ends in the longitudinal direction of the first covering portion 31, a rectangular flat plate-like second covering portion 32 and a third covering portion 33 extending in the thickness direction of the first covering portion 31 are provided. A first longitudinal end 32 a of the second covering part 32 (an end opposite to the end provided with the first covering part 31) and a first longitudinal end 33 a of the third covering part 33. A rectangular flat plate-like fourth extending between the first end portions 32b and 33b in the short direction of the respective covering portions 32 and 33 is provided at (the end portion opposite to the end portion on which the first covering portion 31 is provided). The covering portion 34 is provided. The thickness direction of the fourth covering portion 34 coincides with the short direction of the covering portions 32 and 33, and the longitudinal direction thereof coincides with the opposing direction of the second covering portion 32 and the third covering portion 33. The direction perpendicular to the thickness direction and the longitudinal direction of the fourth covering portion 34 is the short direction of the fourth covering portion 34. A region surrounded by the first covering portion 31, the second covering portion 32, and the third covering portion 33 is a battery accommodating portion S in which the square battery 21 is accommodated.

  Further, terminals that are U-shaped and open in the thickness direction of the fourth covering portion 34 are formed on one end surface in the short direction of the fourth covering portion 34 at both longitudinal ends of the fourth covering portion 34. Each accommodating portion 35 is provided, and each terminal accommodating portion 35 is connected to the second covering portion 32 and the third covering portion 33.

  Square columnar column members 36 and 37 are provided adjacent to the terminal accommodating portion 35 on one end surface of the fourth covering portion 34 in the short direction. The shafts of the column members 36 and 37 extend in the short direction of the covering portions 32 and 33. The column members 36 and 37 are provided with insertion holes 36 a and 37 a through which the bolts B are inserted so as to penetrate in the axial direction of the column members 36 and 37.

  A rectangular flat plate connected to each of the covering portions 32 and 33 at the first longitudinal ends 32 a and 33 a of the second covering portion 32 and the third covering portion 33 and extending in the longitudinal direction of each of the covering portions 32 and 33. A projecting portion 38 is provided. Further, square columnar leg portions 39 are provided on the second end portions 32 c and 33 c in the longitudinal direction of the second covering portion 32 and the third covering portion 33. The axis of the leg portion 39 extends in the short direction of the covering portions 32 and 33. The leg portion 39 is provided with an insertion hole 39 a through which the bolt B is inserted, penetrating in the axial direction of the leg portion 39.

  As shown in FIGS. 4A and 4B, the battery holder 30 has an accommodating portion 41 adjacent to one column member 36 (in the longitudinal direction of the fourth covering portion 34). The accommodating portion 41 has a plate member 42 extending from the fourth covering portion 34 toward the thickness direction of the fourth covering portion 34, and a plate-shaped drop prevention portion 43 extending from the column member 36 toward the plate member 42. ing. The plate member 42 is provided at a position slightly separated from the column member 36 in the longitudinal direction of the fourth covering portion 34. The removal prevention part 43 is provided at a position slightly separated from the battery housing part S. The fourth covering portion 34 is provided with a wall portion 44 that protrudes in the short direction of the fourth covering portion 34 between the plate member 42 and the column member 36. The accommodating part 41 has an opening 45 in a region surrounded by the plate material 42, the drop prevention part 43 and the wall part 44.

  The thermistor 51 is accommodated in the accommodating portion 41. The thermistor 51 is held in contact with the prismatic battery 21 by one surface in the height direction of the prismatic battery 21 (surface on which the connection terminal is provided), the plate material 42, the disconnection preventing portion 43, and the wall portion 44. . The slip-out preventing portion 43 covers a part of the portion of the thermistor 51 that faces the opening 45.

  As shown in FIG. 5, the battery holder 30 holds a bus bar cover 60 for protecting the bus bar 26 connecting the square batteries 21. The bus bar cover 60 as a restraining member is provided between the protruding portions 38 of the battery holder 30. The bus bar cover 60 includes a rectangular flat plate-shaped main body portion 61 and a rectangular flat plate-shaped projecting portion 62 that extends in the thickness direction of the main body portion 61 from both lateral ends of the main body portion 61. The protrusion 62 is provided over the entire length of the main body 61. The bus bar cover 60 is held by the battery holder 30 so that the protruding portion 62 extends along the protruding portion 38 of the battery holder 30. The main body portion 61 is provided with a rectangular flat plate-like pressing portion 63 that extends in the thickness direction of the main body portion 61 from the surface opposite to the surface on which the protruding portion 62 is provided. The pressing part 63 is provided over the entire longitudinal direction of the main body part 61. The bus bar cover 60 is provided such that the surface of the main body 61 on which the pressing portion 63 is provided faces one surface in the height direction of the rectangular battery 21 (the surface on which the connection terminals are provided). The pressing portion 63 is provided at a position facing the opening 45.

  As shown in FIG. 6, a sponge 64 as an elastic body is provided at the tip of the pressing portion 63 (the end of the pressing portion 63 opposite to the main body portion 61). The pressing portion 63 presses the thermistor 51 toward the square battery 21 through the sponge 64. And the opening part 45 is obstruct | occluded by the press part 63 and the sponge 64, and the thermistor 51 is restrained. The pressing portion 63 is provided so as to face the opening 45, and a surface exposed from the opening 45 of the thermistor 51 is a surface facing the pressing portion 63. The above-described removal preventing portion 43 covers a part of the surface of the thermistor 51 that faces the pressing portion 63 (bus bar cover 60).

Next, the operation of the battery module 20 of this embodiment will be described.
For example, in the case where the opening 45 of the housing part 41 is not closed by the pressing part 63, when the battery module 20 is vibrated, the thermistor 51 may come out from the housing part 41 through the opening 45. In the present embodiment, the opening portion 45 is closed by the pressing portion 63 and the thermistor 51 is restrained by pressing the thermistor 51 toward the square battery 21, so that the thermistor 51 is not easily pulled out from the opening portion 45. Note that “blocking” indicates that the thermistor 51 is blocked to the extent that it does not come out of the accommodating portion 41 through the opening 45, and only the state where all of the opening 45 is blocked by the pressing portion 63 is shown. It is not a thing.

  Further, it is preferable that the thermistor 51 is kept in contact with the rectangular battery 21. Due to manufacturing errors of the thermistor 51, the battery holder 30, etc., if there is a gap between the removal preventing portion 43 and the thermistor 51, when the battery module 20 vibrates, the thermistor 51 separates from the prismatic battery 21. The contact state may not be maintained. The contact state between the thermistor 51 and the prismatic battery 21 can be easily maintained by pressing the thermistor 51 toward the prismatic battery 21 by the pressing portion 63 as in the present embodiment.

Therefore, according to the above embodiment, the following effects can be obtained.
(1) The opening 45 of the accommodating portion 41 in which the thermistor 51 is accommodated is closed by the pressing portion 63 of the bus bar cover 60, and the thermistor 51 is restrained by the pressing portion 63 of the bus bar cover 60. For this reason, when the vibration is applied to the battery module 20, the thermistor 51 is prevented from coming out of the accommodating portion 41.

  (2) Moreover, it is preferable that the thermistor 51 is maintained in contact with the prismatic battery 21. By pressing the thermistor 51 against the prismatic battery 21 by the pressing portion 63, the contact state between the thermistor 51 and the prismatic battery 21 can be maintained. Further, since the thermistor 51 can be pressed against the prismatic battery 21 by the pressing portion 63, even if a gap exists between the removal preventing portion 43 and the thermistor 51 due to manufacturing errors of the thermistor 51, the battery holder 30, and the like. The thermistor 51 can be brought into contact with the square battery 21. For this reason, the contact state between the thermistor 51 and the prismatic battery 21 can be maintained, and the temperature detection accuracy of the prismatic battery 21 is improved.

  (3) A sponge 64 is provided at the tip of the pressing portion 63. When the thermistor 51 is pressed by the pressing portion 63, the sponge 64 is elastically deformed. For this reason, the manufacturing error of the thermistor 51 and the pressing part 63 can be absorbed by the elastic deformation amount of the sponge 64.

(4) Since the sponge 64 is provided, the sponge 64 functions as a cushioning material, and the thermistor 51 can be prevented from being damaged.
(5) The accommodation portion 41 is provided with a drop prevention portion 43. For this reason, the thermistor 51 is prevented from falling off from the accommodating portion 41 before the opening 45 is closed by the pressing portion 63 of the bus bar cover 60.

(6) Since the bus bar cover 60 is also used as the restraining member, the opening 45 of the housing portion 41 can be closed without increasing the number of parts.
In addition, you may change embodiment as follows.

  The battery module 20 may be configured as shown in FIG. The battery module 20 shown in FIG. 7 is different from the embodiment in the shape of the protruding portion 38 of the battery holder 30, and the other configurations are the same as those in the embodiment. Details will be described below. As shown in FIG. 7, the protrusion 71 of the battery holder 30 is thicker than the protrusion 38 of the embodiment. An accommodating portion 72 is provided at the tip of the protruding portion 71 (the end opposite to the second covering portion 32 and the third covering portion 33). The accommodating portion 72 is a concave portion provided at the tip of the projecting portion 71 and has an opening 74. The opening 74 is open in the stacking direction of the battery modules 20 (longitudinal direction of the protruding portion 71). A wiring 73 is accommodated in the accommodating portion 72. The wiring 73 is, for example, a wiring that connects the stacked battery modules 20, a wiring that connects the thermistor 51 and the control device, or the like. The opening 74 of the housing portion 72 is closed by the battery holder 30 (restraint member) of the stacked battery modules 20. As a result, the wiring 73 is restrained inside the housing portion 72. Specifically, the movement of the wiring 73 in the stacking direction of the battery module 20 (longitudinal direction of the protruding portion 71) and the thickness of the protruding portion 71 is restricted by the wall surface of the housing portion 72 and the leg portion 39 of the battery holder 30. Has been. Further, as described above, since the wiring 73 is connected to the battery module 20, the thermistor 51, and the like, the movement of the protruding portion 71 in the short direction is also restricted. Note that the opening 74 of the accommodating portion 72 may open in the thickness direction of the protruding portion 71. Even in this case, the wiring 73 can be restrained by configuring the battery holder 30 so that a part of the battery holder 30 closes the opening 74 when the battery modules 20 are stacked. Similarly, the opening 74 may open in the short direction of the protrusion 71. Moreover, the accommodating part 72 may be provided in other places, such as the leg part 39 of the battery holder 30.

  O Other than the bus bar cover 60 may be used as the restraining member. For example, when providing a duct through which the gas discharged from the prismatic battery 21 passes, this duct may be used as a restraining member. In addition, the opening part 45 can be obstruct | occluded using the battery module 20 by using the module structural member which comprises the battery module 20, such as a duct and the bus-bar cover 60, as a restraining member.

○ Rubber may be used as the elastic body.
A cylindrical battery or a laminate battery may be used as the battery cell.
○ The number of the prismatic batteries 21 may be increased or decreased. The square battery 21 may be singular.

The accommodating part 41 may be configured such that the opening 45 opens in the width direction of the prismatic battery 21 or may be configured so that the opening 45 opens in the thickness direction of the prismatic battery 21.
O The thermistor 51 and the square battery 21 do not need to contact. For example, an inclusion such as an insulating sheet may be interposed between the thermistor 51 and the square battery 21.

DESCRIPTION OF SYMBOLS 20 ... Battery module, 21 ... Square battery, 30 ... Battery holder, 41, 72 ... Housing part, 43 ... Detachment prevention part, 45, 74 ... Opening part, 51 ... Thermistor, 60 ... Busbar cover, 64 ... Sponge, 73 …wiring.

Claims (4)

A plurality of battery cells; a battery holder provided for each of the plurality of battery cells, and holding the battery cells; and a battery module in which a plurality of the battery cells held in the battery holder are arranged in parallel.
A case for housing the battery module;
A battery pack comprising:
The battery holder is provided with a housing portion having an opening at least in part, and the thermistor is housed in the housing portion,
The thermistor is constrained by a constraining member arranged to face the opening,
The battery module is housed in the case in a state where the opening is closed by the restraining member,
The restraining member is a duct through which gas discharged from the battery cell passes,
The opening, the battery pack, characterized in that it is accommodated in the casing in a state of being closed by the outer surface of the duct. A plurality of battery cells; a battery holder provided for each of the plurality of battery cells, and holding the battery cells; and a battery module in which a plurality of the battery cells held in the battery holder are arranged in parallel.
A case for housing the battery module;
A battery pack comprising:
The battery holder is provided with a housing portion having an opening at least in part, and the thermistor is housed in the housing portion,
The thermistor is constrained by a constraining member arranged to face the opening,
The battery module is housed in the case in a state where the opening is closed by the restraining member,
In the case, a plurality of the battery modules are stacked in a vertical direction,
The restraining member, the features and to that batteries pack that the battery holder of the battery modules stacked immediately above. The battery holder is
A battery accommodating portion in which the battery cell is accommodated;
A columnar leg portion extending vertically downward from the battery housing portion,
The battery pack according to claim 2 , wherein the leg portion closes the opening of the battery module stacked immediately below. A plurality of battery cells;
A battery holder that is provided for each battery cell and holds the battery cell;
A battery module in which a plurality of the battery cells held in the battery holder are arranged in parallel,
The battery holder is provided with a housing portion having an opening at least in part, and wiring is housed in the housing portion,
The battery module, wherein the wiring is constrained by a constraining member disposed to face the opening.