JP2010033777A - Battery pack container, battery pack, and lithium secondary battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery pack container capable of preventing corrosion of a battery container or a battery lid, or with manufacturing reliability secured without any difficulty in structural designing. <P>SOLUTION: The battery pack container includes a battery pack container body 24 and contact terminal structures 25. The battery pack container body 24 has housing areas 23 for housing secondary batteries 1. The contact terminal structures 25 are provided at the battery pack container body 24, with at least part of each exposed into each housing area 23. The contact terminal structure 25 can be in contact with an outer surface of each secondary battery 1, when the latter 1 is housed in the housing area 23. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a battery pack container, a battery pack, and a lithium secondary battery.

  In a lithium secondary battery, an aluminum-based material may be used as a material for a battery container in order to reduce the weight. Aluminum-based materials have a property of reacting with lithium ions to form a LiAl alloy. Therefore, a technique for preventing the reaction has been studied. For example, JP-A-10-21889 discloses a container and an electrode current collector for a lithium ion secondary battery. In this container, the inner surface is covered with a coating layer formed of a metal material that is difficult to alloy with lithium such as copper or nickel. As its effect, it is described that the reaction and alloying between the can and lithium inside thereof can be prevented.

Japanese Patent Laid-Open No. 10-21889

  As a method for preventing the alloying, in addition to the method of coating the inner surface of the battery container with a metal material that is difficult to alloy, there is a method of coating the inner surface of the battery container with an insulating material that is difficult to react with lithium. Conceivable. However, when the inner surface of the container is covered with a coating film made of such a metal material or insulating material, the entire inner surface cannot always be completely covered, and scratches and pinholes may occur and the aluminum-based material may be exposed. Conceivable. In such a case, the above alloying may occur from those scratches and pinholes, which may cause deterioration of the container and deterioration of battery performance. A technique for preventing corrosion of battery containers and battery lids such as alloying is desired.

  An object of the present invention is to provide a battery pack container, a battery pack, and a lithium secondary battery capable of preventing corrosion of the battery container and the battery lid.

  Another object of the present invention is to provide a battery pack container, a battery pack, and a lithium secondary battery that have no structural design difficulties and can be manufactured reliably.

  These objects and other objects and advantages of the present invention can be easily confirmed by the following description and attached drawings.

  Hereinafter, means for solving the problem will be described using the numbers and symbols used in the best mode for carrying out the invention. These numbers and symbols are added in parentheses in order to clarify the correspondence between the description of the claims and the best mode for carrying out the invention. However, these numbers and symbols should not be used for interpreting the technical scope of the invention described in the claims.

The battery pack container of the present invention comprises a battery pack container body (24) and a contact terminal structure (25). The battery pack container body (24) has a storage area (23) for storing the secondary battery (1). The contact terminal structure (25) is provided in the battery pack container body (24), and at least a part thereof is exposed in the storage area (23). The contact terminal structure (25) can contact the outer surface of the secondary battery (1) when the secondary battery (1) is stored in the storage area (23).
In the present invention, when the secondary battery (1) is stored in the storage area (23), the contact terminal structure (25) contacts the surface of the secondary battery (1). The contact terminal structure (25) and the secondary battery (1) are electrically connected by the contact. Thus, the contact terminal structure (25) can be easily connected to the secondary battery (1). The connection of the wiring (31a) to the contact terminal structure (25) can be easily performed without affecting the secondary battery (1). And connecting the current limiting means (32) and the other wiring (31b) to the wiring (31a), and connecting the other wiring (31b) to the positive terminal (4) of the secondary battery (1) It can be performed very easily. Therefore, the outer surface of the secondary battery (1) and the positive electrode terminal (4) can be easily electrically connected.
By electrically connecting the outer surface of the secondary battery (1) and the positive terminal (4), alloying (corrosion) of the battery container (3) and the battery lid (2) of the secondary battery (1) is achieved. It can be greatly suppressed. Further, since the connection terminal structure (25) is provided not in the battery container (3) but in the battery pack container (20), the structural reliability of the secondary battery (1) is not given and the reliability in manufacturing is improved. Can be maintained.

In the above battery pack container, the contact terminal structure (25) includes an elastic part (25-1) and a holding part (25-2). The elastic portion (25-1) contacts the outer surface of the secondary battery (1) while being deformed when the secondary battery (1) is stored in the storage area (23). The holding part (25-2) holds the elastic part (25-1) in the battery pack container body (24).
In the present invention, since the elastic portion (25-1) of the contact terminal structure (25) is elastically deformed and comes into contact with the outer surface of the secondary battery (1), the structure is relatively simple and stable. Connection can be maintained.

In the battery pack container, the contact terminal structure (25) is provided on the side surface or the bottom surface of the storage area (23).
In the present invention, since the contact terminal structure (25) is required to be provided on the side surface or the bottom surface of the storage area (23), the contact terminal structure (25) is inserted when the secondary battery (1) is inserted into the storage area (23). It can be made difficult to obstruct.

The battery pack container further includes a holding member (26) capable of holding the protection circuit (30) of the secondary battery (1).
In the present invention, since the protection circuit (30) of the secondary battery (1) can be easily mounted inside, the structure of the battery pack (50) can be simplified as a whole.

In the battery pack container, there are a plurality of storage areas (23), and the contact terminal structure (25) is provided in each of the plurality of storage areas (23).
In this invention, since a several secondary battery (1) can be accommodated as a battery pack container, a battery pack (50) with high charging / discharging capability can be comprised.

The battery pack of the present invention comprises the battery pack container (20) according to any one of the above paragraphs, and the secondary battery (1) stored in the storage area (23) of the battery pack container (20). It has. The contact terminal structure (25) of the battery pack container (20) is in contact with the outer surface of the secondary battery (1) and is connected to the positive terminal (4) of the secondary battery (1) via the current limiting means (32). Electrically connected.
In the present invention, when the secondary battery (1) is stored in the storage area (23), the outer surface of the secondary battery (1) and the positive electrode terminal (4) can be easily electrically connected. Thereby, alloying (corrosion) of the battery container (3) and the battery lid (2) of the secondary battery (1) can be significantly suppressed. Further, since the connection terminal structure (25) is provided not in the battery container (3) but in the battery pack container (20), the structural reliability of the secondary battery (1) is not given and the reliability in manufacturing is improved. Can be maintained.

The secondary battery of the present invention comprises a battery container (3), a battery lid (2), and a current control means (32). The battery lid (2) has a positive electrode terminal (4) and a negative electrode terminal (5), and is provided in the battery container (3). The current control means (32) has one end connected to the positive terminal (4) via the first wiring (31b) and the other end connected to the battery lid (2) via the second wiring (31a). The second wiring (31a) is directly connected to the battery lid (2) by welding.
In the present invention, the outer surface (battery cover (2)) of the secondary battery (1) and the positive electrode terminal (4) can be directly and easily connected by welding with the wiring (31a). Thereby, alloying (corrosion) of the battery container (3) and the battery lid (2) of the secondary battery (1) can be significantly suppressed. Moreover, since it is simply connected to the battery lid (2) by welding, it is possible to maintain manufacturing reliability without giving any structural design difficulty with respect to the secondary battery (1).

  According to the present invention, it is possible to provide a battery pack container, a battery pack, and a lithium secondary battery that can prevent corrosion of the battery container and the battery lid. In addition, it is possible to provide a battery pack container, a battery pack, and a lithium secondary battery that have no structural design difficulties and can have manufacturing reliability.

  Hereinafter, embodiments of a battery pack container, a battery pack, and a lithium secondary battery of the present invention will be described with reference to the accompanying drawings.

(First embodiment)
First, the lithium secondary battery used for the battery pack according to the first embodiment of the present invention will be described. 1 and 2 are a top view and a front view showing a schematic configuration of the lithium secondary battery according to the first embodiment of the present invention. The lithium secondary battery 1 includes a battery lid 2 and a battery container 3.

  The battery lid 2 is a lid for sealing the battery container 3 and is formed of, for example, a steel material such as stainless steel or an aluminum-based material. The battery lid 2 is coupled to the battery container 3 by a method such as laser welding. The battery cover 2 includes a positive electrode terminal 4, a negative electrode terminal 5, insulators 14 and 15, a gas vent valve 6, and a safety valve 11.

  The positive electrode terminal 4 is an extraction terminal for a positive electrode, and is attached to the battery lid 2 via an insulator 14. The positive electrode terminal 4 is made of aluminum, for example, and is connected to the positive electrode (described later) inside the battery container 3. The positive electrode terminal 4 may cover the outer surface of the battery container 3 with, for example, nickel plating in order to reduce contact resistance. The negative electrode terminal 5 is a takeout terminal for a negative electrode, and is attached to the battery lid 2 via an insulator 15. The negative electrode terminal 5 is made of, for example, copper, and is connected to a negative electrode (described later) inside the battery container 3.

  The gas vent valve 6 opens the gas in the battery container 3 to the outside when the pressure in the battery container 3 becomes equal to or higher than a predetermined pressure. That is, the gas vent valve 6 can be continuously used and has a function of keeping the internal pressure of the lithium secondary battery 1 within a range that does not exceed the allowable pressure of the battery container 3. The safety valve 11 bursts when the pressure in the battery container 3 suddenly rises, and releases the pressure in the battery container 3. The safety valve 11 is exemplified by a rupture disk. Thereby, it can prevent that the whole battery container 3 bursts.

  The battery container 3 is a container for storing a battery main body, and is formed of, for example, a steel material such as stainless steel or an aluminum-based material. Since the battery container 3 is coupled to the battery lid 2, the two are also electrically connected. The inner surface of the battery container 3 may be in direct contact with the electrolytic solution, but may be covered with an insulating film such as a modified polyolefin.

  FIG. 3 is a schematic diagram showing a schematic internal configuration of the lithium secondary battery according to the first embodiment of the present invention. The battery container 3 includes an electrolytic solution 7, a positive electrode 8, and a negative electrode 9.

The electrolytic solution 7 is a non-aqueous electrolytic solution containing lithium ions (example: an organic solvent such as ethylene carbonate or diethyl carbonate + a lithium salt such as lithium hexafluorophosphate (LiPF ₆ )). The positive electrode 8 is configured, for example, by applying lithium manganate (LiMn ₂ O ₄ ) capable of inserting and extracting lithium ions as a positive electrode active material on the surface of a main body made of aluminum foil or the like. The positive electrode terminal 4 is connected to the upper part. The negative electrode 9 is made of, for example, carbon or graphite. The negative electrode terminal 5 is connected to the upper part. A plurality of positive electrodes 8 and negative electrodes 9 are alternately arranged, and a separator is inserted between them. The separator is made of, for example, a porous polymer film such as polyethylene or polypropylene, a non-woven fabric made of glass fiber or polymer fiber, or the like.

  Note that the configuration of the lithium secondary battery is an example, and other configurations can be used without departing from the technical idea of the present invention.

  Next, the battery pack and the battery pack container according to the embodiment of the present invention will be described. FIG. 4 is a schematic perspective view showing an example of the configuration of the battery pack according to the first embodiment of the present invention. The battery pack 50 includes a plurality of lithium secondary batteries 1, a battery pack container 20, and a protection circuit 30. Here, a battery pack 50 that stores four lithium secondary batteries 1 will be described as an example.

  The battery pack container 20 has a plurality of storage areas 23 and a protection circuit installation area 27. Each of the plurality of storage areas 23 stores the lithium secondary battery 1 and the protection circuit installation area 27 stores the protection circuit 30. The battery pack container 20 is formed of a resin (eg, plastic). The resin is preferably a resin having high corrosion resistance, high strength, and a certain degree of elasticity. For example, it is an engineering plastic having relatively high strength and corrosion resistance exemplified by polycarbonate (PC), polyethylene terephthalate (PET), and polybutylene terephthalate (PBT).

  The lithium secondary battery 1 is stored in the storage area 23 of the battery pack container 20. The details of the lithium secondary battery 1 are as described with reference to FIGS. 1 to 3 as described above. In the plurality of lithium secondary batteries 1, the positive terminal 4 and the negative terminal 5 are connected by a plurality of bus bars (not shown) so as to be in a predetermined connection state. The predetermined connection method is exemplified by, for example, a case where four lithium secondary batteries 1 are connected in series with each other, a case where they are connected in parallel with each other, and a combination thereof.

  The protection circuit 30 is stored in the protection circuit installation area 27 of the battery pack container 20. The protection circuit 30 includes current limiting means 32 (not shown, which will be described later). The current limiting means 32 has one end connected to the wiring 31a and the other end connected to the wiring 31b. However, in this drawing, only the wirings 31a and 31b related to one lithium secondary battery 1 are shown, and the wirings related to other lithium secondary batteries 1 are omitted. The current limiting means 32 is connected to the positive electrode terminal 4 via the wiring 31b and to the battery case 3 via the wiring 31a and the contact terminal structure 25 (not shown, which will be described later). That is, the battery container 3 is connected to the positive electrode terminal 4 via the current limiting means 32. Such a connection is preferable because it can prevent alloying and corrosion of the battery container 3 as will be described later.

  5A and 5B are yz schematic cross-sectional views schematically showing configurations of the battery pack and the battery pack container according to the first embodiment of the present invention. However, FIG. 5A shows a case where the lithium secondary battery 1 is stored, and the wirings 31a and 31b and the current limiting means 32 are described in a circuit diagram. FIG. 5B shows a case where the lithium secondary battery 1 is not stored, and the wirings 31a and 31b and the current limiting means 32 are described by broken lines in a circuit diagram. The battery pack container 20 may include a wiring 31a. Furthermore, the current limiting means 32 may be included. Furthermore, the wiring 31b may be included.

  The battery pack container 20 stores the lithium secondary battery 1 in the storage area 23. The battery pack container 20 includes a battery pack container body 24 and a contact terminal structure 25. The battery pack container main body 24 has a container shape partitioned into a plurality of storage areas 23. The container shape is formed by a bottom member 22 and a plurality of side members 21 rising from the bottom member 22. One storage area 23 includes a bottom member 22 and four side members 21.

  The contact terminal structure 25 is a conductor that is at least partially exposed in the storage region 23 and provided so as to be able to contact the outer surface of the battery container 3 of the lithium secondary battery 1. That is, when the lithium secondary battery 1 is accommodated in the accommodation area 23, the outer surface of the battery container 3 is brought into contact (electrically connected) with the contact terminal structure 25. At that time, the contact terminal structure 25 is pressed against the battery container 3 by elastically deforming the contact terminal structure 25 and / or by elastically deforming a part of the storage region 23. As a result, the battery case 3 and the contact terminal structure 25 are electrically connected.

  Here, the contact terminal structure 25 is connected to the current limiting means 32 via the wiring 31a, and the current limiting means 32 is connected to the positive electrode terminal 4 of the lithium secondary battery 1 via the wiring 31b. That is, the positive electrode terminal 4 and the battery case 3 are connected via the current limiting means 32. Thereby, the positive electrode terminal 4 and the battery container 3 can be held at the same potential. As a result, the potential of the battery container 3 (aluminum-based material) can be kept within a range of potential that can prevent alloying of lithium ions with LiAl. The potential range in which alloying of lithium ions with LiAl can be prevented, for example, means that the potential of the battery container 3 with respect to the negative electrode terminal 5 is 0.3 V or more. More preferably, it is 0.5 V or more. The current limiting means 32 may be an element or a circuit having a function of limiting the current flowing between the positive electrode terminal 4 and the battery container 3. The current limiting means 32 is exemplified by a resistance element and a fuse.

When the current limiting means 32 is provided, a current may flow from the positive electrode terminal 4 to the negative electrode terminal 5 via the battery container 3 due to a short circuit between the negative electrode terminal 5 and the battery container 3. In order to cope with such a case, when the current limiting means 32 is a resistance element, even if a current flows from the positive terminal 4 via the battery container 3 to the negative terminal 5, the current value is 10 ⁻³ A or less. It is preferable that the resistance element has such a resistance value as follows. In the lithium secondary battery 1 of the present embodiment, the voltage between the positive electrode terminal 4 and the negative electrode terminal 5 in a normal case is about 2.0V to 4.5V. Therefore, the resistance value of the resistance element is preferably about 1 kΩ or more. As a result, even when an abnormality such as a short circuit between the negative electrode terminal 5 and the battery container 3 occurs, the current flowing from the positive electrode terminal 4 to the negative electrode terminal 5 via the battery container 3 can be limited to a minute current. The lithium secondary battery 1 can be prevented from being damaged by an electric current or the like.

  FIG. 6 is an xz schematic cross-sectional view showing an example of the configuration of the battery pack and the battery pack container according to the first embodiment of the present invention. However, FIG. 6 shows one lithium secondary battery 1 and the peripheral portion of the protection circuit 30 extracted.

  The battery pack container main body 24 has an attachment member 21 a in the accommodation area 23. The attachment member 21 a is provided in the vicinity of the side member 21, has one end fixed to the bottom member 22, and rises from the bottom member 22 substantially parallel to the side member 21. Since the other end of the mounting member 21a is not fixed, the mounting member 21a can swing like a leaf spring with the fixed side as a fulcrum.

  The contact terminal structure 25 is formed of a conductive material having elasticity, and connects the battery container 3 and the wiring 31a. The contact terminal structure 25 is exemplified by metal, and particularly exemplified by a steel material such as stainless steel. The contact terminal structure 25 includes an elastic part 25-1 and a holding part 25-2. The holding portion 25-2 has a substantially concave shape (U-shape), and the mounting member 21a is fitted into the concave portion, and is fixed on the mounting member 21a. One end of the wiring 31a is connected to a part thereof by a method such as welding or soldering. One end of the elastic part 25-1 is connected to the holding part 25-2 and rises substantially parallel to the side member 21 from the connected part. When the lithium secondary battery 1 is stored in the storage region 23, the elastic portion 25-1 contacts the surface of the battery container 3 of the lithium secondary battery 1 while being elastically deformed like a leaf spring. Since it is in contact with the surface of the battery case 3 of the lithium secondary battery 1 while being elastically deformed, it is always electrically connected to the surface of the battery case 3. As a result, the contact terminal structure 25 electrically connects the battery container 3 and the wiring 31a.

  In addition, although the contact terminal structure 25 is provided in the outer side surface of the storage area | region 23 in this figure, you may be provided in the other side surface and bottom face. Moreover, although the contact terminal structure 25 is provided in the bottom part of the side surface in this figure, you may provide in the intermediate part or upper part of the side surface. Further, the shape is not limited to the shape of FIG. 6, and has a shape that is pressed against the surface of the battery container 3 of the lithium secondary battery 1 when the lithium secondary battery 1 is stored in the storage region 23. It should be.

  The battery pack container main body 24 further includes a protection circuit holding member 26 provided in the protection circuit installation area 27 in the accommodation area 23. The protection circuit holding member 26 is attached to the side member 21 and holds the protection circuit 30. The protection circuit 30 includes a terminal unit 36 and a current limiting unit 32. The terminal portion 36 is connected to the wiring 31 a at one terminal and is connected to the wiring 31 b at the other terminal 36. In the current limiting means 32, one terminal is connected to one terminal of the terminal portion 36 and the other terminal is connected to the other terminal. Thereby, the wiring 31a, the current limiting means 32, and the wiring 31b are connected in this order.

  FIG. 7 is a circuit diagram showing the protection circuit 30 according to the first embodiment of the present invention. The protection circuit 30 may further include a measurement circuit 34 and a charge / discharge control circuit 35 in addition to the terminal portion 36 and the current limiting means 32. The measurement circuit 34 measures the voltage between the negative electrode terminal 5 and the battery container 3. The charge / discharge control circuit 35 detects a potential abnormality of the battery container 3 based on this voltage and stops charging / discharging.

  The measurement circuit 34 compares / detects the voltage between the negative electrode terminal 5 and the battery container 3 and outputs a comparison signal indicating the comparison result to the charge / discharge control circuit 35. Based on the comparison signal, the charge / discharge control circuit 35 determines that the potential of the battery case 3 is abnormal when this voltage is within a preset appropriate range (eg, 0.3 V or more). When the charge / discharge control circuit 35 determines that the potential of the battery container 3 is abnormal, the charge / discharge control circuit 35 electrically connects or disconnects the lithium secondary battery 1 and an external device such as a power source (not shown) or a load (not shown). The switch 40 to be turned off is turned off. Thereby, the electrical connection between the external device and the lithium secondary battery 1 is disconnected.

  The charge / discharge control circuit 35 is a reference value in which a voltage difference between the container voltage of the battery container 3 in the measurement circuit 34 and the voltage between the positive terminal 4 and the negative terminal 5, that is, the battery voltage is set in advance (example: 100 mV) or more, a potential abnormality may be detected.

  As described above, the protection circuit 30 according to the present embodiment includes the measurement circuit 34 that measures the potential of the battery container 3 and the discharge control circuit 35 that stops charging and discharging when a potential abnormality of the battery container 3 is detected. I have. Therefore, when the potential of the battery container 3 is out of the potential range in which alloying of lithium ions with LiAl can be prevented, it is possible to detect potential abnormality at an early stage and respond quickly. Thereby, deterioration of the battery container 3 and deterioration of battery performance due to alloying with LiAl can be reliably prevented.

  In the present embodiment, the measurement circuit 34 measures the voltage between the negative electrode terminal 5 and the battery container 3, but measures the voltage between the positive electrode terminal 4 and the battery container 3 to charge / discharge. The control circuit 35 may detect potential abnormality based on this voltage and stop charging / discharging.

  In the present embodiment, a conductive material having spring elasticity is provided as the contact terminal structure 25 in the battery pack container 20, and the contact terminal structure 25 is electrically connected to the positive electrode terminal 4 via the current limiting means 32. . Thereby, the aluminum-based material of the battery container 3 can be prevented from being alloyed with lithium ions. In addition, since there is no need to provide a connection terminal on the battery lid 2 side, there is no difficulty in structural design, and the battery using the battery pack container 20 of the present invention while maintaining manufacturing reliability. The pack 50 can be manufactured.

(Second Embodiment)
First, a lithium secondary battery used for the battery pack according to the second embodiment of the present invention will be described. 8 and 9 are a top view and a perspective view showing a schematic configuration of a lithium secondary battery according to the second embodiment of the present invention. The lithium secondary battery 1 is basically the same as that of the first embodiment (FIGS. 1 to 3). However, the first point is that one end of the current control means 32 is directly connected to the positive electrode terminal 4 via the wiring 31b, and the other end of the current control means 32 is directly connected to the battery lid 2 via the wiring 31a. This is different from the embodiment.

  Here, as described above, the battery lid 2 is formed of a steel material such as stainless steel or an aluminum-based material. On the other hand, the wiring 31a is exemplified by a copper wire, for example. And as the formation method (connection method (coupling | bonding method)) of the coupling | bond part 38 which has directly connected the wiring 31a and the battery lid 2 on the battery cover 2, the welding method illustrated by laser welding or ultrasonic welding And a solder bonding method using solder. The current limiting means 32 is the same as that in the first embodiment.

  Even in the case of the present embodiment, the positive terminal 4 and the battery case 3 are connected via the current limiting means 32. Thereby, the positive electrode terminal 4 and the battery container 3 can be held at the same potential. As a result, the potential of the battery container 3 (aluminum-based material) is kept within a potential range (eg, the potential of the battery container 3 with respect to the negative electrode terminal 5 is 0.3 V or more) in which alloying with lithium ions into LiAl can be prevented. I can do it.

  In addition, when the current limiting means 32 is provided, a current may flow from the positive electrode terminal 4 to the negative electrode terminal 5 via the battery container 3 due to a short circuit between the negative electrode terminal 5 and the battery container 3. Even in such a case, even if an abnormality such as a short circuit between the negative electrode terminal 5 and the battery container 3 occurs by setting the current limiting means 32 to a predetermined value, the negative electrode is connected from the positive electrode terminal 4 via the battery container 3. The current flowing to the terminal 5 can be limited to a minute current, and the lithium secondary battery 1 can be prevented from being damaged by an overcurrent or the like.

  In the present embodiment, in the battery pack container 20, the conductive material is directly connected to the battery container 3 as the contact terminal structure 25, and the contact terminal structure 25 is electrically connected to the positive electrode terminal 4 through the current limiting means 32. is doing. Thereby, the aluminum-based material of the battery container 3 can be prevented from being alloyed with lithium ions. In addition, since the connection is made directly to the battery lid 2 by a simple method and there is no need to provide a special connection terminal, there is no difficulty in structural design, while maintaining manufacturing reliability. A battery pack 50 using the battery pack container 20 of the present invention can be manufactured.

  The present invention is not limited to the embodiments described above, and it is obvious that the embodiments can be appropriately modified or changed within the scope of the technical idea of the present invention.

FIG. 1 is a top view showing a schematic configuration of a lithium secondary battery according to an embodiment of the present invention. FIG. 2 is a front view showing a schematic configuration of the lithium secondary battery according to the embodiment of the present invention. FIG. 3 is a schematic diagram showing a schematic internal configuration of the lithium secondary battery according to the embodiment of the present invention. FIG. 4 is a schematic perspective view showing an example of the configuration of the battery pack according to the first embodiment of the present invention. FIG. 5A is a yz schematic cross-sectional view schematically showing the configuration of the battery pack and the battery pack container according to the first embodiment of the present invention. FIG. 5B is a yz schematic cross-sectional view schematically showing the configuration of the battery pack and the battery pack container according to the first embodiment of the present invention. FIG. 6 is an xz schematic cross-sectional view showing an example of the configuration of the battery pack and the battery pack container according to the first embodiment of the present invention. FIG. 7 is a circuit diagram showing a protection circuit according to the first embodiment of the present invention. FIG. 8 is a top view showing a schematic configuration of a lithium secondary battery according to the second embodiment of the present invention. FIG. 9 is a perspective view showing a schematic configuration of a lithium secondary battery according to the second embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lithium secondary battery 2 Battery cover 3 Battery container 4 Positive electrode terminal 5 Negative electrode terminal 6 Gas vent valve 7 Electrolytic solution 8 Positive electrode 9 Negative electrode 11 Safety valve 14, 15 Insulator 20 Battery pack container 21 Side member 21a Mounting member 22 Bottom member 23 Storage Area 24 Battery pack container body 25 Contact terminal structure 25-1 Elastic part 25-2 Holding part 26 Holding member 27 Protection circuit installation area 30 Protection circuit 31a, 31b Wiring 32 Current limiting means 34 Measurement circuit 35 Charge / discharge control circuit 36 Terminal 38 Joint 40 Switch 50 Battery pack protection circuit

Claims (7)

A battery pack container body having a storage area for storing a secondary battery;
A contact terminal structure provided in the battery pack container main body, at least a part of which is exposed in the storage area, and
The contact terminal structure is capable of contacting an outer surface of the secondary battery when the secondary battery is stored in the storage area. The battery pack container according to claim 1,
The contact terminal structure is
An elastic part that contacts the outer surface of the secondary battery while being deformed when the secondary battery is stored in the storage area;
A battery pack container comprising: a holding part that holds the elastic part in the battery pack container main body. The battery pack container according to claim 1 or 2,
The contact terminal structure is provided on a side surface or a bottom surface of the storage area. The battery pack container according to any one of claims 1 to 3,
A battery pack container further comprising a holding member capable of holding a protection circuit for the secondary battery. The battery pack container according to any one of claims 1 to 4,
There are a plurality of storage areas, and the contact terminal structure is provided in each of the plurality of storage areas. The battery pack container according to any one of claims 1 to 5,
A secondary battery stored in the storage area of the battery pack container,
The battery pack container has a contact terminal structure that contacts an outer surface of the secondary battery and is electrically connected to a positive electrode terminal of the secondary battery via a current limiting unit. A battery container;
A battery lid provided on the battery container, having a positive electrode terminal and a negative electrode terminal;
Current control means having one end connected to the positive terminal via a first wiring and the other end connected to the battery lid via a second wiring;
The second wiring is a secondary battery that is directly connected to the battery lid by welding.

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