Battery pack

Abstract

The present invention provides a battery pack that can be connected to the same object even if the number of pouch-type battery cells is changed. [Solution] According to one aspect of the present invention, a battery pack is provided that can be attached to and detached by moving it relative to an object in a predetermined direction, comprising a plurality of pouch-type battery cells and a wiring board, wherein the plurality of pouch-type battery cells are arranged with their respective electrodes on the same side and aligned in a predetermined direction, and the wiring board is configured by connecting the electrodes of the plurality of pouch-type battery cells.

Description

Technical Field

[0006] ,

[0007] , ,

[0001] The present invention relates to a battery pack.

Background Art

[0002] Patent Document 1 discloses an energy storage module having an optimal ratio of volume, weight, and / or material / part requirements for the energy that can be stored in the energy storage module and being as safe as possible.

[0003] This energy storage module is particularly based on a battery pack for supplying power to a power tool, which consists of a plurality of cells electrically interconnected for energy storage. It is proposed that the cells are electrochemical storage cells consisting of a dimensionally unstable flexible cell casing. Also, it relates to a power tool including at least one such energy storage module.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, the prior art disclosed in Patent Document 1 still has room for improvement.

[0006] In view of the above circumstances, the present invention aims to provide a battery pack that can be connected to the same object even when the number of pouch-type battery cells is changed.

Means for Solving the Problems

[0007] According to one aspect of the present invention, a battery pack is provided that can be attached to and detached by moving it relative to an object in a predetermined direction, comprising a plurality of pouch-type battery cells and a wiring board, wherein the plurality of pouch-type battery cells are arranged with their respective electrodes on the same side and aligned in a predetermined direction, and the wiring board is configured by connecting the electrodes of the plurality of pouch-type battery cells.

[0008] According to this embodiment, a battery pack can be provided that can be connected to the same object even if the number of pouch-type battery cells is changed. [Brief explanation of the drawing]

[0009] [Figure 1] This is a perspective view of the object from above. [Figure 2] This is an overall perspective view of the battery pack. [Figure 3] This is an exploded perspective view showing the configuration of the wiring board, pouch-type battery cell, and fixing member. [Figure 4] This is an exploded perspective view showing the configuration of the case, wiring board, pouch-type battery cell, and fixing member. [Figure 5] This is an overall view of the battery pack. [Figure 6] This is an overall view of the battery pack. [Figure 7] This is a cross-sectional view illustrating the internal structure of the battery pack, shown in the direction of the arrow A-A in Figure 5. [Figure 8] Figure 5 shows a cross-sectional perspective view illustrating the opening, taken in the direction of the B-B arrow. [Figure 9] This is a cross-sectional perspective view illustrating the internal structure of the battery pack, with some components of the battery pack omitted and shown in the direction of the CC arrow in Figure 6. [Figure 10] This is a cross-sectional view illustrating the cross-sectional shape of the fixing member, shown in the direction of the A-A arrow in Figure 5. [Figure 11] This diagram illustrates the process of attaching a pouch-type battery cell to the fixing member shown in area D of Figure 10. [Figure 12] This is a diagram for explaining the size of the area of the pouch-type battery cell and the gap between the fixing members as viewed from the insertion direction. [Figure 13] This is a cross-sectional view for explaining a modified example of the case, shown in the direction of arrow A-A shown in FIG. 5. [Figure 14] This is an overall perspective view of the battery pack for explaining a modified example of the case. [Figure 15] This is a diagram showing a modified example of the guide portion of the fixing member. [Figure 16] This is a diagram showing a modified example of the guide portion of the fixing member. [Figure 17] This is a diagram showing a modified example of the guide portion of the fixing member.

Mode for Carrying Out the Invention

[0010] Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings. Various characteristic matters shown in the following embodiments can be combined with each other.

[0011] <Object 100> First, the object 100 according to an embodiment will be described.

[0012] FIG. 1 is a perspective view of the object as viewed from above.

[0013] In the following description, based on "up", "down", "left", "right", "front" and "rear" shown in FIG. 1, the directions of the object 100 and each member constituting the object 100 are defined. Further, in the following description, "up" is also referred to as "upper side" or "above", and "down" is also referred to as "lower side" or "below". Also, the direction formed by up and down is referred to as "vertical" or "vertical direction". The same applies to "left", "right", "front" and "rear".

[0014] The object 100 shown in FIG. 1 is a portable lawn mower 101. This lawn mower 101 includes a cutting blade 200, a main body 300, an operation lever 400, a handle 500, and a battery pack 1. The lawn mower 101 is a shoulder strap type lawn mower that uses an electric motor (not shown) as a power source. Also, the object 100 uses the lawn mower 101 as an example, but it is not particularly limited as long as it is various electric machinery using the battery pack 1. For example, the object 100 may be an electric working machine, an electric tool, an industrial machine, etc. that can detach and attach the battery pack 1. Hereinafter, the case where the object 100 is the lawn mower 101 will be described as an example.

[0015] As shown in FIG. 1, the lawn mower 101 has a disk-shaped cutting blade 200 on the front side. The cutting blade 200 is configured to rotate by the rotational power of an electric motor (not shown), and is configured to be able to cut grass etc. by rotating. Specifically, a chip saw is adopted for the cutting blade 200.

[0016] The cutting blade 200 is connected to the front side of the operation lever 400. The operation lever 400 is a pipe-shaped member extending in the front-rear direction, and has a drive transmission shaft (not shown) inside. The operation lever 400 is configured to transmit power to the cutting blade 200 by the drive transmission shaft. The operation lever 400 has the main body 300 on the rear side.

[0017] A handle 500 is attached to the operation lever 400 between the cutting blade 200 and the main body 300. The handle 500 is a part that is gripped and operated by the operator's hand. Also, the main body 300 has an electric motor (not shown), a control unit (not shown), etc. inside.

[0018] A battery pack 1 is detachably attached to the rear of the main body 300. The battery pack 1 is a battery pack that can be detached by moving it relatively in the left-right direction, which is a predetermined direction, with respect to the lawn mower 101 (an example of the object 100).

[0019] <Battery pack 1> Next, a battery pack 1 according to one embodiment will be described.

[0020] Figure 2 is an overall perspective view of the battery pack. Figure 3 is an exploded perspective view showing the configuration of the wiring board, pouch-type battery cells, and fixing members. Figure 4 is an exploded perspective view showing the configuration of the case, wiring board, pouch-type battery cells, and fixing members. Figures 5 and 6 are overall views of the battery pack. Figure 7 is a cross-sectional view illustrating the internal configuration of the battery pack, shown in the direction of arrow A-A in Figure 5. Figure 8 is a cross-sectional perspective view illustrating the opening, shown in the direction of arrow B-B in Figure 5. Figure 9 is a cross-sectional perspective view illustrating the internal configuration of the battery pack, shown in the direction of arrow CC in Figure 6, with some parts of the battery pack omitted. Figure 10 is a cross-sectional view illustrating the cross-sectional shape of the fixing member, shown in the direction of arrow A-A in Figure 5. Figure 11 is a diagram illustrating the process of attaching pouch-type battery cells to the fixing member shown in area D in Figure 10. Figure 12 is a diagram illustrating the size of the area of ​​the gap between the pouch-type battery cells and the fixing member when viewed from the insertion direction. Figure 13 is a cross-sectional view illustrating a modified case, shown in the direction of arrow A-A in Figure 5. Figure 14 is an overall perspective view of the battery pack illustrating a modified case. Figures 15 to 17 show modified guide portions of the fixing members.

[0021] In the following explanation, the orientation of Battery Pack 1 and each component constituting Battery Pack 1 is defined based on "up," "down," "left," "right," "front," and "rear" as shown in Figures 2 to 17. Furthermore, in the following explanation, "up" will also be referred to as "upper side" or "upward," and "down" will also be referred to as "lower side" or "downward." The direction formed by "up" and "down" will be referred to as "up and down" or "up and down direction." The same applies to "left," "right," "front," and "rear."

[0022] As shown in Figure 2, the battery pack 1 is box-shaped and includes a case 2. The case 2 includes an upper outer housing 21 and a lower outer housing 22, which are divided vertically by planes defined by the front and rear and left and right sides. The upper outer housing 21 and the lower outer housing 22 are fixed together with fastening members such as screws (not shown).

[0023] As shown in Figures 3 and 4, the box formed by the upper outer housing 21 and the lower outer housing 22 houses an inner housing 23, a lever 24, a spring 25, a wiring board 3, a plurality of pouch-type battery cells 4, and a fixing member 5. In other words, the battery pack 1 comprises a wiring board 3 housed in the case 2, a plurality of pouch-type battery cells 4, and a fixing member 5.

[0024] As shown in Figures 4 and 6, the upper external housing 21 is lid-shaped and, when assembled to the lower external housing 22, houses the above-mentioned components in the case 2. The upper external housing 21 also includes a lever mounting portion 21a and a terminal mounting portion 21b.

[0025] The lever mounting portion 21a has a hole formed on the rear side of the upper outer housing 21, into which the lever 24 is inserted from below to above in the case 2. As shown in Figure 5, the terminal mounting portion 21b has a plurality of holes formed on the front side of the upper outer housing 21. Specifically, the terminal mounting portion 21b has six holes. The connection terminals 31c of the wiring board 3 are positioned (inserted) inside the holes of the terminal mounting portion 21b, and when the battery pack 1 is attached to the brush cutter 101, the terminals (not shown) of the brush cutter 101 are connected to the connection terminals 31c of the wiring board 3. The configuration of the lever 24 and the connection terminals 31c of the wiring board 3 will be described in detail later.

[0026] As shown in Figure 4, the lower outer housing 22 is box-shaped and configured to accommodate various components inside. Inside the lower outer housing 22 is the inner housing 23. The inner housing 23 is box-shaped and configured to accommodate various components inside.

[0027] As shown in Figure 7, the lower outer housing 22 is provided with a spring mounting portion 22c on its rear upper side, and a spring 25 is configured to be attached to the spring mounting portion 22c. The spring 25 is a spiral spring. The upper side of the spring 25 is inserted into the spring mounting portion 24a of the lever 24. The lever 24 is inserted into the lever mounting portion 21a on its upper side, and is positioned to extend and retract relative to the lever mounting portion 21a (upper outer housing 21) when the upper outer housing 21 and the lower outer housing 22 are assembled. When the lever 24 extends, the battery pack 1 is fixed to the brush cutter 101, and when the lever 24 retracts, the fixed battery pack 1 can be removed from the brush cutter 101.

[0028] As shown in Figure 4, a wiring board 3 is located on the upper side inside the battery pack 1. The wiring board 3 has a first wiring board 31 and a second wiring board 32. The first wiring board 31 and the second wiring board 32 are electrically connected by a connector connection portion 31b on the first wiring board 31 and a connector 32b on the second wiring board 32. The second wiring board 32 has an electrode mounting portion 32c into which the electrodes 4c of the pouch-type battery cell 4 are inserted and fixed by welding. In other words, the wiring board 3 is constructed by connecting the electrodes 4c of multiple pouch-type battery cells 4. The electrodes 4c may also be fixed by press-fitting them into the electrode mounting portion 32c. In this case, it is easy to replace a defective pouch-type battery cell 4 with a new one. Furthermore, a bolt 33 is inserted into the through hole 31a of the first wiring board 31, and the threaded portion of the bolt 33 protruding from the first wiring board 31 is screwed into the threaded hole 32a of the second wiring board 32. This fixes the first wiring board 31 and the second wiring board 32 together.

[0029] Furthermore, the first wiring board 31 is provided with a connection terminal 31c on its front upper side. As shown in Figure 5, the connection terminal 31c is configured to be electrically connectable via the terminal mounting portion 21b of the upper outer housing 21 when the first wiring board 31 is housed in the case 2. This allows the battery pack 1 and the brush cutter 101 to be electrically connected when the battery pack 1 is attached to the brush cutter 101. In other words, the battery pack 1 is provided with a connection terminal 31c that can be electrically connected to the brush cutter 101 (an example of the object 100).

[0030] Furthermore, as shown in Figure 7, multiple pouch-type battery cells 4 are housed inside the internal housing 23. The pouch-type battery cells 4 are rechargeable batteries, such as pouch-type (laminated) lithium-ion rechargeable batteries.

[0031] Furthermore, the number of pouch-type battery cells 4 and the specifications of each pouch-type battery cell 4 are set so that the battery pack 1 has a sufficiently high output and charging capacity suitable for work with the brush cutter 101. Specifically, 14 pouch-type battery cells 4 of the same specifications are connected in series so that the battery pack 1 has a predetermined output and charging capacity.

[0032] Furthermore, as shown in Figure 3, the multiple pouch-type battery cells 4 are arranged in the front-to-back direction, i.e., the direction in which the battery pack 1 is attached and detached, with their electrodes 4c facing upwards. In other words, the multiple pouch-type battery cells 4 are arranged with each electrode 4c of the pouch-type battery cell 4 on the same side and in a predetermined direction (for example, the front-to-back direction). With this configuration, the number of pouch-type battery cells 4 can be increased by changing the size of the battery pack 1 in a predetermined direction (for example, the front-to-back direction). As a result, even with a battery pack 1 that has an increased number of pouch-type battery cells 4, it can be attached and detached to the brush cutter 101 without interfering with the brush cutter 101, just as it can be attached and detached to the brush cutter 101 with the battery pack 1 before the increase in the number of pouch-type battery cells 4. In other words, even if the number of pouch-type battery cells 4 is changed, it is possible to make a battery pack 1 that can be connected to the same brush cutter 101. Furthermore, since the electrodes 4c of the pouch-type battery cells 4 and the wiring board 3 are arranged to be connectable, it can be easily manufactured.

[0033] Furthermore, each pouch-type battery cell 4 is equipped with a positive electrode 4c and a negative electrode 4c. Multiple pouch-type battery cells 4 are arranged side by side such that the arrangement of the positive electrode 4c and the negative electrode 4c alternates between the right and left sides, that is, the front and back sides of adjacent pouch-type battery cells 4 are reversed. This makes it easy to connect each pouch-type battery cell 4 in series.

[0034] Furthermore, as shown in Figure 7, each of the multiple pouch-type battery cells 4 is equipped with electrodes 4c on its upper side, and the wiring board 3 is connected to the electrodes 4c. In addition, a connection terminal 31c is located in front of and above the first wiring board 31 of the wiring board 3. That is, the first wiring board 31 on which the connection terminal 31c is mounted is located on the opposite side of the multiple pouch-type battery cells 4 from the second wiring board 32 to which the multiple pouch-type battery cells 4 are connected. In other words, the connection terminal 31c is located on the opposite side of the multiple pouch-type battery cells 4 from the wiring board 3. With this configuration, the electrodes 4c of the pouch-type battery cells 4 and the connection terminal 31c can be placed in close proximity, thereby reducing power loss while maintaining the manufacturability of the battery pack 1.

[0035] As shown in Figure 3, when attaching the electrodes 4c of the multiple pouch-type battery cells 4 to the wiring board 3, the position of each electrode 4c is aligned with the position of the electrode mounting portion 32c of the wiring board 3. In this case, the position adjustment is performed by attaching the pouch-type battery cells 4 to the gap 5a of the fixing member 5. Specifically, as shown in Figure 10, the fixing member 5 has a gap 5a into which each pouch-type battery cell 4 is inserted. Also, as shown in Figure 11, each pouch-type battery cell 4 is inserted into the gap 5a from top to bottom, which is the insertion direction. The position adjustment of the multiple pouch-type battery cells 4 is performed by inserting each pouch-type battery cell 4 into the gap 5a provided by the fixing member 5. In this case, the amount of insertion in the vertical direction is, for example, to insert the fixing member 5 to the position of the upper end of the side surface of the pouch-type battery cell 4. In other words, the fixing member 5 is configured to position the multiple pouch-type battery cells 4 relative to the wiring board 3 by fixing them. According to this embodiment, by assembling the pouch-type battery cell 4 and the fixing member 5, it becomes possible to position the pouch-type battery cell 4 when connecting it to the wiring board 3, and the battery pack 1 can be manufactured more easily.

[0036] Furthermore, the fixing member 5 may have a fixing portion 5b and a guide portion 5c. Specifically, as shown in Figure 11, the fixing member 5 has a guide portion 5c on the upper side of the gap 5a and a fixing portion 5b on the lower side of the gap 5a. In other words, the guide portion 5c is connected to the fixing portion 5b. Also, the width 5d of the fixing portion 5b is narrower than the width 4d of the pouch-type battery cell 4. Furthermore, as shown in Figure 12, the area of ​​the gap 5a viewed from the insertion direction (up and down direction) in its natural state, i.e., before the pouch-type battery cell 4 is inserted and no external force is applied, is smaller than the area of ​​each pouch-type battery cell 4 viewed from the insertion direction. In other words, the opening area of ​​the gap 5a viewed from the insertion direction (up and down direction) for inserting the pouch-type battery cell 4 is smaller than the area of ​​each pouch-type battery cell 4 viewed from the insertion direction. With this configuration, the fixing portion 5b is configured to fix each pouch-type battery cell 4 by making close contact with the pouch-type battery cell 4 inserted into the gap 5a. According to this embodiment, positioning of the pouch-type battery cell 4 when connecting it to the wiring board 3 becomes easier, further improving manufacturability.

[0037] As shown in Figure 11, the width of the guide portion 5c defined in the front-to-back direction narrows as you move from the top (insertion direction) downwards. This guides the pouch-type battery cell 4 so that when it is inserted into the gap 5a, its front-to-back center aligns with the front-to-back center of the gap 5a. Similarly, the width of the guide portion 5c defined in the left-to-right direction also narrows as you move from the top (insertion direction) downwards. This guides the pouch-type battery cell 4 so that when it is inserted into the gap 5a, its left-to-right center aligns with the left-to-right center of the gap 5a. In other words, the guide portion 5c is configured to guide each pouch-type battery cell 4 to the fixing portion 5b when assembling each pouch-type battery cell 4 with the fixing portion 5b. This configuration makes it easier and more accurate to assemble the pouch-type battery cell 4 with the fixing member 5, and allows for the efficient manufacture of the battery pack 1.

[0038] As shown in Figure 3, the fixing member 5 has the same number of gaps 5a as the pouch-type battery cells 4. Specifically, the fixing member 5 has 14 gaps 5a, and one pouch-type battery cell 4 is inserted into each gap 5a. Furthermore, as shown in Figures 7 and 9, when each pouch-type battery cell 4 is inserted into a gap 5a of the fixing member 5, the gaps 5a and the pouch-type battery cell 4 are in close contact. Specifically, the pouch-type battery cell 4 is inserted into the gaps 5a of the fixing member 5 with the pouch portion that protrudes outward from the side of the pouch-type battery cell 4 folded. This causes the gaps 5a and the pouch-type battery cell 4 to be in close contact. In addition, when the fixing member 5 is housed inside the internal housing 23, the fixing member 5 and the internal housing 23 are in close contact. As a result, the internal housing 23, the multiple pouch-type battery cells 4, and the fixing member 5 form a first space IS1 above the fixing member 5 and a second space IS2 below the fixing member 5. In other words, the fixing member 5 is configured to divide the inside of the battery pack 1 into the first space IS1 and the second space IS2.

[0039] As shown in Figure 7, the first space IS1 and the second space IS2 are configured not to communicate with each other by the fixing member 5 being in close contact with the internal housing 23 and the pouch-type battery cell 4. In other words, the second space IS2 is configured not to communicate with the first space IS1. That is, the second space IS2 has a sealing property such that it does not communicate with the first space IS1 by the fixing member 5 being in close contact with at least the pouch-type battery cell 4. With this configuration, the fixing member 5 can be used to position the pouch-type battery cell 4 when connecting it to the wiring board 3, thereby improving manufacturability, while protecting the components located in the second space IS2 from water, dirt, etc. that may enter through the first space IS1. Furthermore, with this configuration, when the brush cutter 101 shown in Figure 1 is being used to cut grass etc. growing from the ground with the cutting blade 200 while the battery pack 1 is attached, it is possible to suppress water that has entered the first space IS1 from outside the case 2 from entering the second space IS2. In other words, it is possible to suppress water from coming into contact with the electrodes 4c of the pouch-type battery cell 4 located in the second space IS2.

[0040] Furthermore, as shown in Figure 13, a lever storage space R is preferably formed in the case 2. The lever storage space R is a space formed when the upper outer housing 21 and the lower outer housing 22 are assembled. The lever 24 is movably positioned in the lever storage space R relative to the upper outer housing 21. In addition, the lever storage space R is configured so as not to communicate with the first space IS1 and the second space IS2 by partitioning the inside of the case 2. In other words, the lever mounting portion 21a is configured not to communicate with the first space IS1 and the second space IS2.

[0041] Furthermore, as shown in Figure 14, the upper outer housing 21 may be provided with a packing P around the terminal mounting portion 21b. This ensures that when the battery pack 1 is attached to the brush cutter 101, the packing P is in close contact with the brush cutter 101 and the upper outer housing 21, preventing communication between the second space IS2 and the outside of the battery pack 1. The packing P can be any material that provides a sealing effect by being in close contact with the brush cutter 101 and the upper outer housing 21; for example, a rubber packing may be used. With this configuration, when the battery pack 1 is attached to the brush cutter 101, the second space IS2 can be isolated from the outside of the case.

[0042] Furthermore, the fixing member 5 is preferably an elastic material. The elastic material can be made of at least one material selected from the group consisting of norbornene rubber (NB), chloroprene rubber (CR), acrylonitrile butadiene rubber (NBR), urethane rubber, fluororubber, and silicone rubber. In this embodiment, the elastic force of the fixing member 5 makes it possible to position the pouch-type battery cell 4 when connecting it to the wiring board 3 and to prevent the intrusion of water, dirt, etc., thereby improving manufacturability and sealing performance. Note that the fixing member 5 is not limited to an elastic material, but may be any material that can adhere closely to the pouch-type battery cell 4, for example, a material that adheres by plastic deformation, a packing, a sealant, etc.

[0043] Furthermore, the fixing member 5 may be composed of a single component. This configuration improves manufacturability and sealing performance by improving positioning accuracy and airtightness when connecting the pouch-type battery cell 4 to the wiring board 3. It also prevents an increase in the number of components in the battery pack 1.

[0044] Furthermore, as shown in Figure 8, the fixing member 5 demarcates the first space IS1 and the second space IS2, so that the pouch-type battery cell 4 has a first region 4a and a second region 4b, which are defined according to the position where the fixing member 5 is attached. In other words, each pouch-type battery cell 4 has a first region 4a located in the first space IS1 and a second region 4b located in the second space IS2. Specifically, as shown in Figure 8, the fixing member 5 is attached to the upper side of the pouch-type battery cell 4. The pouch-type battery cell 4 also has a first region 4a below the position where the fixing member 5 is attached, and a second region 4b above the position where the fixing member 5 is attached. The second region 4b includes the electrode 4c located on the upper side of the pouch-type battery cell 4. In other words, the second region 4b includes the electrode 4c. In this configuration, the fixing member 5 improves manufacturability by positioning the pouch-type battery cell 4 when connecting it to the wiring board 3, while also preventing malfunctions and damage by protecting the electrodes 4c of the pouch-type battery cell 4 from the ingress of water, dust, etc.

[0045] [others] The battery pack 1 according to one embodiment may be implemented in the following manner.

[0046] In the above embodiment, a case in which a pouch-type battery cell 4 is housed in the battery pack 1 was described as an example, but the invention is not limited to this, and for example, a rectangular or cylindrical battery cell may be housed in the battery pack 1.

[0047] In the above embodiment, the example described was one in which the fixing member 5 is inserted up to the upper end of the side surface of the pouch-type battery cell 4, but the embodiment is not limited to this. For example, a jig or the like may be used to ensure that the fixing member 5 is inserted into a predetermined position on the pouch-type battery cell 4.

[0048] In the guide portion 5c shown in Figure 11, the case where the insertion direction is from top to bottom was explained as an example, but it is not limited to this. For example, the insertion direction may be from bottom to top. As shown in Figure 15, in this case the fixing member 5 has a guide portion 5c on the lower side of the gap 5a and a fixing portion 5b on the upper side of the gap 5a. Furthermore, the insertion direction may be either upward or downward. As shown in Figure 16, in this case the fixing member 5 has guide portions 5c on the upper and lower sides of the gap 5a, and a fixing portion 5b between the upper guide portion 5c and the lower guide portion 5c.

[0049] In the guide section 5c shown in Figure 11, the width defined in the front-to-back direction narrows in a curved manner as you move from the top to the bottom, which is the insertion direction. However, this is not the only example. As shown in Figure 17, for example, it may narrow in a straight line. Also, although not shown, the width of the guide section 5c may narrow in a stepped (discontinuous) manner.

[0050] Furthermore, they may be provided in the following embodiments.

[0051] (1) A battery pack that can be attached to and detached by moving it relative to an object in a predetermined direction, comprising a plurality of pouch-type battery cells and a wiring board, wherein the plurality of pouch-type battery cells are arranged with their respective electrodes on the same side and aligned in the predetermined direction, and the wiring board is configured by connecting the electrodes of the plurality of pouch-type battery cells.

[0052] According to this embodiment, the number of pouch-type battery cells can be increased by changing the size of the battery pack in a predetermined direction. As a result, even with a battery pack that has had its number of pouch-type battery cells increased, it can be attached to and detached from the same object as a battery pack that had been attached and detached before the increase in the number of pouch-type battery cells, without interfering with the object. In other words, even if the number of pouch-type battery cells is changed, the battery pack can be made connectable to the same object. Furthermore, since the electrodes of the pouch-type battery cells and the wiring board are arranged to be connected together, it can be easily manufactured.

[0053] (2) A battery pack as described in (1) above, further comprising a connection terminal that can be electrically connected to the object, wherein the connection terminal is located on the opposite side of the plurality of pouch-type battery cells with respect to the wiring board.

[0054] According to this embodiment, the electrodes and connection terminals of the pouch-type battery cell can be placed in close proximity, thereby reducing power loss while maintaining the manufacturability of the battery pack.

[0055] (3) A battery pack according to (1) or (2) above, further comprising a fixing member, wherein the fixing member is configured to fix the plurality of pouch-type battery cells and thereby position them relative to the wiring board.

[0056] According to this embodiment, by assembling the pouch-type battery cell with the fixing member, it becomes possible to position the pouch-type battery cell when connecting it to the wiring board, and the battery pack can be manufactured more easily.

[0057] (4) A battery pack as described in (3) above, wherein the fixing member is configured to divide the inside of the battery pack into a first space and a second space, and the second space is configured not to communicate with the first space.

[0058] In this embodiment, the fixing member allows for positioning of the pouch-type battery cell when connecting it to the wiring board, thereby improving manufacturability, while also protecting components located in the second space from the intrusion of water, dust, etc.

[0059] (5) A battery pack as described in (4) above, wherein each pouch-type battery cell has a first region located in the first space and a second region located in the second space, and the second region includes the electrodes.

[0060] In this configuration, the fixing member is used to position the pouch-type battery cell when connecting it to the wiring board, thereby improving manufacturability, while protecting the electrodes of the pouch-type battery cell from the ingress of water, dust, etc., thereby preventing malfunctions and damage.

[0061] (6) A battery pack according to any one of (3) to (5) above, wherein the fixing member has a fixing portion and a guide portion, the fixing portion is configured to fix each of the pouch-type battery cells, and the guide portion is connected to the fixing portion and is configured to guide each of the pouch-type battery cells to the fixing portion when assembling each of the pouch-type battery cells and the fixing portion.

[0062] According to this embodiment, the assembly of pouch-type battery cells and fixing members can be performed more easily and accurately, and battery packs can be manufactured efficiently.

[0063] (7) A battery pack according to any one of (3) to (6) above, wherein the fixing member has a gap into which each of the pouch-type battery cells is inserted, and the opening area of ​​the gap as viewed from the insertion direction into which the pouch-type battery cells are inserted is smaller than the area of ​​each of the pouch-type battery cells as viewed from the insertion direction.

[0064] According to this embodiment, positioning of pouch-type battery cells when connecting them to a wiring board becomes easier, further improving manufacturability.

[0065] (8) A battery pack according to any one of (3) to (7) above, wherein the fixing member is an elastic body.

[0066] In this configuration, the elastic force of the fixing member makes it possible to position the pouch-type battery cell when connecting it to the wiring board and to prevent the intrusion of water, dust, etc., thereby further improving manufacturability and sealing performance.

[0067] (9) A battery pack according to any one of (3) to (8) above, wherein the fixing member is composed of a single member.

[0068] According to this embodiment, manufacturability and sealing performance can be improved by enhancing the positioning accuracy and airtightness when connecting pouch-type battery cells to a wiring board. Of course, this is not always the case.

[0069] Finally, various embodiments of the present invention have been described, but these are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in a variety of other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims and their equivalents. [Explanation of Symbols]

[0070] 100: Object 101: Brush cutter 200: Cutting blade 300: Main body 400: Operating rod 500: Handle 1: Battery pack 2: Case 21: Upper external housing 21a: Lever mounting part 21b: Terminal mounting section 22: Lower external housing 22c: Spring mounting part 23: Internal Housing 24: Lever 24a: Spring mounting section 25: Spring 3: Wiring board 31: First wiring board 31a: Through hole 31b: Connector connection part 31c: Connection terminal 32: Second wiring board 32a: Screw hole 32b: Connector 32c: Electrode mounting section 33: Bolt 4: Pouch-type battery cells 4a: First area 4b: Second area 4c: Electrode 4d:width 5: Fixing member 5a: Gap 5b:Fixed part 5c: Guide section 5d: width IS1: First space IS2: The Second Space P: Packing R: Lever storage space

Claims

1. A battery pack that can be attached and detached by moving it relative to an object in a predetermined direction, It comprises multiple pouch-type battery cells and a wiring board, The plurality of pouch-type battery cells are arranged such that the electrodes of each pouch-type battery cell are on the same side and aligned in the predetermined direction. The aforementioned wiring board is configured by connecting the electrodes of the plurality of pouch-type battery cells, and is a battery pack.

2. In the battery pack according to claim 1, The object further comprises a connection terminal that can be electrically connected to the object, The aforementioned connection terminal is located on the opposite side of the plurality of pouch-type battery cells from the wiring board in the battery pack.

3. In the battery pack according to claim 1, Further equipped with fixing members, The aforementioned fixing member is configured to position the plurality of pouch-type battery cells relative to the wiring board, thereby providing a battery pack.

4. In the battery pack according to claim 3, The fixing member is configured to divide the inside of the battery pack into a first space and a second space. A battery pack in which the second space is configured not to communicate with the first space.

5. In the battery pack according to claim 4, Each of the pouch-type battery cells has a first region located in the first space and a second region located in the second space. The second region is a battery pack including the electrodes.

6. In the battery pack according to claim 3, The aforementioned fixing member has a fixing portion and a guide portion. The fixing portion is configured to fix each of the pouch-type battery cells, The battery pack is configured such that the guide portion is connected to the fixing portion and guides each pouch-type battery cell to the fixing portion when assembling each pouch-type battery cell to the fixing portion.

7. In the battery pack according to claim 3, The fixing member has a gap into which each of the pouch-type battery cells is inserted. The aforementioned gap is a battery pack in which the opening area viewed from the insertion direction into which the pouch-type battery cells are inserted is smaller than the area of ​​each pouch-type battery cell viewed from the insertion direction.

8. In the battery pack according to claim 3, The aforementioned fixing member is an elastic body, a battery pack.

9. In the battery pack according to claim 3, The aforementioned fixing member is a battery pack composed of a single component.

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