JPH08106929A - Secondary battery with thermometry element - Google Patents

Abstract

PURPOSE: To hold stable posture by stably positioning a thermometry element in a secondary battery. CONSTITUTION: A secondary battery 1 has a fixing plate 2 and a thermometry element 3. The fixing plate 2 has an engaging hole 21 for fitting to a projecting electrode 11 formed on the upper surface of the secondary battery 1, a cut-off part 22 for housing a thermometry part 31 of the thermometry element 3, and a fixing groove 23 for positioning and fixing lead wires 32 of the thermometry element 3. The fixing plate 2 is fixed by fitting the engaging hole 21 to the projecting electrode 11, and the thermometry element 3 is fixed to the fixing plate 2, and its position and posture are stably held.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a secondary battery having a temperature detecting element for detecting the temperature of the secondary battery,
The mounting is performed via a mounting plate.

[0002]

2. Description of the Related Art Various methods are known as charge control for a chargeable / dischargeable secondary battery. However, the change in the heat generation temperature of the secondary battery, which increases with charging, is used, or The one used as one is general. It is preferable to detect the battery temperature in the state where the thermistor which is a temperature detecting element is in contact with or close to the battery surface from the viewpoint of temperature measuring accuracy, while the battery part does not have a shape for supporting and fixing the thermistor etc. Conventionally, it has been general that the lead wires of a thermistor are used by being bent so as to follow the outer shape of the battery and arranged.

FIG. 6 is an external view showing a conventional thermistor mounting structure. As shown in the figure, a required number of batteries B, ... Are connected in series via a connection terminal board J in order to obtain a required voltage and capacity. Are stored in a pack (note that
The connection terminal plate between the two secondary batteries B on the right side of the figure is omitted.) The temperature-sensitive portion of the thermistor TH is arranged on the upper surface of one battery B on which the anode protrusion Bo is formed, and in a gap from the surface to the height of the anode protrusion Bo to effectively utilize the space. The lead wire of the thermistor TH extends downward along the side surface of the battery B and is connected to the detection terminal T. It should be noted that the detection terminal T comes into contact with the temperature detection terminal extending from the charge control circuit section when set in a charging device (not shown) during charging.

[0004]

In the method of mounting the thermistor TH shown in FIG. 6, the position where the thermistor TH is arranged is maintained only by the rigidity of its lead wire, which makes it extremely unstable. As a result, the temperature sensing part of the thermistor TH may be displaced or separated from the detection part of the battery, leading to a decrease in temperature detection accuracy or a detection error, and the charge control may not operate normally, or the lead wires may be erroneously contacted with each other. Then, the temperature data itself may not be obtained. Further, since the thermistor TH is not fixed, the workability of connecting the lead wire of the thermistor TH and the detection terminal T is poor, and there is a possibility of inducing a connection error.

Further, in the conventional secondary battery, if overcharging occurs due to abnormal temperature detection, deterioration of the battery is promoted and the service life is shortened.

The present invention has been made in view of the above,
It is an object of the present invention to provide a secondary battery with a temperature measuring element, which enables a stable posture to be maintained by positioning the temperature measuring element with a mounting plate supported on one surface of the secondary battery.

[0007]

The present invention is a secondary battery in which a temperature detecting element and a temperature measuring element having a plurality of lead wires are attached via an attaching plate made of an insulating material, wherein the attaching plate is An engagement hole fitted to a protruding electrode formed on one surface of the secondary battery, a notch for accommodating the temperature measuring portion of the temperature measuring element, and a continuous portion of the notch. A fixing groove for fixing the position of each lead wire is formed (Claim 1).

Further, according to the present invention, the engaging hole is formed to have a diameter slightly smaller than the diameter of the protruding electrode, and a plurality of escape notches are formed in the circumferential direction (claim 2).

Further, according to the present invention, the fixing groove is formed in a sectional shape for preventing the lead wire from coming off (claim 3).

Further, each of the conductive terminals connected to the tip side of the lead wire is provided in parallel on the other surface of the secondary battery (claim 4).

[0011]

According to the invention of claim 1, the engaging portion of the mounting plate is fitted and supported by the protruding electrode formed on one surface of the secondary battery. The temperature measuring element of the temperature measuring element is housed in the notched space of the mounting plate and retracted from the plate surface. Further, the lead wires of the temperature detecting element, usually two lead wires, are respectively laid in the two fixing grooves corresponding to each other in a buried state, whereby the position and the posture of the temperature detecting element with respect to the secondary battery are stably maintained. Moreover, since the mounting plate is made of an insulating material, the protruding electrode and the lead wire are not short-circuited.

According to the second aspect of the present invention, when the engaging hole of the mounting plate is fitted into the protruding electrode, it is press-fitted by the escape notch around the engaging hole, so that it is difficult to come out. As a result, the position and orientation of the temperature sensitive element can be stably maintained via the mounting plate.

According to the third aspect of the present invention, since the lead wire becomes difficult to receive after it is fitted into the fixing groove, the position is maintained.

According to the fourth aspect of the invention, since the tip end side of the lead wire and the detection terminal are connected, it is easy to connect the temperature detection terminal extending from the charge control circuit section. Further, since the temperature sensitive element is mounted on the mounting plate, the work of connecting the tip portion of the lead wire and the conductive terminal can be easily and surely performed.

[0015]

1 is a perspective view of a single secondary battery with a temperature detecting element according to the present invention. FIG. 2 is a perspective view showing a state in which a required number of secondary batteries are packed.

In FIG. 1, the secondary battery 1 is, for example, Ni.
A chargeable / dischargeable battery such as a Cd battery having a rectangular parallelepiped outer shape. Reference numeral 11 denotes a columnar (see FIG. 3) protruding electrode of an anode formed on the upper surface, and a negative electrode is formed on the bottom surface. Further, two strip-shaped detection terminals 12 made of a conductive material are attached in parallel on the lower part of the front side surface of the secondary battery 1. The detection terminal 12 is for contacting with a temperature detection terminal extending from the charge control circuit portion when set in a charging device (not shown) during charging.

Reference numeral 2 is a mounting plate made of an insulating material which is mounted on the upper surface of the secondary battery 1 and has a required thickness and
It has the same shape as the upper surface of the secondary battery 1. The detailed structure of the mounting plate 2 will be described later. Reference numeral 3 denotes a temperature detecting element such as a thermistor, which is composed of a temperature detecting portion 31 of the head and, for example, two lead wires 32 having a predetermined length drawn from the temperature detecting portion 31.

FIG. 2 shows a case where three secondary batteries 1, 1a and 1b are connected in series, and the different poles of each secondary battery are connected by a long connecting terminal plate 13. In the figure, the connection terminal plate between the secondary batteries 1a and 1b is omitted. The temperature measuring element 3 is attached to the secondary battery 1. The temperature measuring element 3 may be attached to each secondary battery.

FIG. 3 is a view for explaining the mounting of the secondary battery, the mounting plate and the temperature detecting element. In the figure, the mounting plate 2 is
It has a thickness that is at least thinner than the height of the protruding electrode 11, and has the same shape as the upper surface of the secondary battery 1. A hole 21 is formed at a position substantially in the center of the mounting plate 2 and at a position corresponding to the protruding electrode 11 when the secondary battery 1 is covered. The shape of this hole 21 is the same as the cross-sectional shape of the protruding electrode 11, and the inner diameter thereof matches the outer diameter of the protruding electrode 11. When the mounting plate 2 is made of a material having elasticity, it may be formed to have a slightly smaller diameter so that the mounting plate 2 does not come off easily or accidentally after being pressed into the electrode protrusion 11. preferable.

Further, a rectangular notch 22 is formed in the rear portion of one end of the mounting plate 2 in consideration of ease of forming work. The notch 22 is provided in the temperature measuring unit 3 of the temperature measuring element 3.
1 is formed so as to have a space in which the temperature can be stored, and the temperature detecting portion 31 is stored in the notch 22. The shape of the notch 22 may be a quadrangle, but it may be the same as the shape of the temperature measuring portion 31. By doing so, there is an advantage that the posture of the temperature measuring element 3 can be more stably held by housing. The notch 22 may be formed by cutting the end portion of the mounting plate 2 into an L shape, but by leaving the sides on the left and right sides as shown in FIG. It secures stability.

On the front side of the notch 22, the notch 2
Two grooves 23, which have a U-shaped cross section and are continuous with 2, are formed parallel to the front end. This groove 23 is a temperature measuring element 3.
The lead wire 32 has a depth substantially equal to or larger than the cross-sectional diameter of the lead wire 32, so that the lead wire 32 is securely fitted into the groove 23.

FIG. 4 is a plan view showing a modified example of the shape of the hole 21 formed in the mounting plate 2. (a) is a type that contacts the protrusion, and (b) is a type that contacts a part of the peripheral surface. Is shown. It should be noted that, since these modified examples involve the deformation of the shape,
This is particularly effective when the mounting plate 2 is made of an elastic material.

The hole 21 shown in FIG. 4A is formed to have a diameter slightly larger than the outer diameter of the protruding electrode 11, and the arc-shaped protruding portions 2 are formed at four equally divided portions in the circumferential direction toward the center.
11 is projected. The size between the protruding portions 211 facing each other is slightly smaller than the outer diameter of the protruding electrode 11, so that when the protrusion electrode 11 is press-fitted, another large diameter portion 212 absorbs the deformation of the protruding portion 211. It acts as a notch for relief and enhances the crimpability. The number of protrusions 211 is not limited to four and may be three at equal or unequal positions in the circumferential direction.

Further, the hole 21 shown in FIG. 3B is formed to have a diameter slightly smaller than the outer diameter of the protruding electrode 11, and the circles in the circumferentially quadrant of the hole 21 are oriented radially outward. An arc-shaped or slit-shaped relief notch 213 is formed. When the protrusion electrode 11 is press-fitted, the relief notch 213 absorbs the deformation of the contact portion with the protrusion electrode 11 to improve the pressure-bonding property. Note that the number of escape notches 213 is not limited to four, and may be less than four or conversely greater in relation to the notch shape.
The larger the number, the larger the deformation absorption amount.

FIG. 5 is a cross-sectional view showing a modified example of the shape of the groove 23 formed in the mounting plate 2, wherein (a) is a U-shaped section.
(B) shows a wedge-shaped cross section, and (c) shows an arc-shaped cross section.

The groove 23 shown in FIG. 3A is formed to have a width dimension slightly smaller than the cross-sectional diameter of the lead wire 32. This allows the lead wire 32 to be press-fitted so as to easily prevent the lead wire 32 from coming off. ing. The groove 23 shown in FIG. (B) has a width that increases toward the inside, and the width of the inlet is the same as or slightly smaller than that of the lead wire 32. This prevents easy removal after being once fitted. are doing. The groove 23 shown in FIG. (C) is formed in a shape that matches the cross-sectional shape of the lead wire 32, that is, an arc shape in this example, so that the fitted state is stable and does not easily come off. . By adopting such a configuration, it is possible to reliably prevent a short circuit between the wires.

In the case of the modified examples shown in FIGS. (B) and (c), the inlet of the groove 23 is set to be equal to or smaller than the cross-sectional diameter of the lead wire 32, and the tip of the lead wire 32 extends along the groove 23 from the notch 22 side. If it is configured to be slid and fitted, the detachment can be reliably prevented.

In this embodiment, the shape of the secondary battery 1 is described as a rectangular parallelepiped, but the present invention is not limited to this, and it may have a columnar shape, and it may be formed on one surface. It is sufficient if the protruding electrodes are formed. And this one surface may be a curved surface other than a flat surface. In the case of a curved surface, the shape of the mounting plate 2 may be matched with this curved surface. Further, the shape of the bump electrode 11 is not limited to a cylinder, but may be a prism, and in this case, the shape of the hole 21 may be rectangular.

[0029]

According to the invention as set forth in claim 1, an engagement hole fitted to a protruding electrode formed on one surface of the secondary battery, and a notch for accommodating the temperature measuring portion of the temperature measuring element, Since the notch is continuous with the mounting plate having the fixing groove for fixing the position of each of the lead wires of the temperature sensing element and the mounting plate is mounted on the secondary battery, the temperature sensing element is attached to the secondary battery. The position and posture can be stably maintained. Further, as a result, the temperature detecting operation is reliably performed, so that it is possible to provide a secondary battery in which deterioration promotion is effectively prevented.

According to the second aspect of the invention, the engaging hole is
Since the diameter of the protruding electrode is slightly smaller than that of the protruding electrode, and a plurality of relief notches are formed in the circumferential direction, the engaging hole of the mounting plate is effectively pressed into the protruding electrode, making it difficult to remove. As a result, the position and posture of the temperature sensitive element can be stably maintained via the mounting plate.

According to the invention of claim 3, the fixing groove is
Since the lead wire is configured to have a cross-sectional shape that prevents the lead wire from coming off, it is possible to prevent the lead wire from coming off after it is fitted into the fixing groove, maintain its position, and reliably prevent a short circuit between wires. .

According to the invention of claim 4, the conductive terminals connected to the tip side of the lead wire are arranged in parallel on the other surface of the secondary battery. Connection with the extended temperature measuring terminal becomes easy. Further, since the temperature sensitive element is mounted on the mounting plate, the work of connecting the tip portion of the lead wire and the conductive terminal can be easily and surely performed.

[Brief description of drawings]

FIG. 1 is a perspective view of a single secondary battery with a temperature measuring element according to the present invention.

FIG. 2 is a perspective view showing a state in which a required number of secondary batteries are packed.

FIG. 3 is a diagram illustrating how to attach a secondary battery, a mounting plate, and a temperature detecting element.

FIG. 4 is a plan view showing a modified example of the shape of the hole formed in the mounting plate, (a) showing a type contacting with the protrusion, and (b) showing a type contacting a part of the peripheral surface.

5A and 5B are cross-sectional views showing a modified example of the shape of the groove formed in the mounting plate, where FIG. 5A is a U-shaped cross section, and FIG. 5B is a wedge-shaped cross section.
(C) shows an arcuate cross section.

FIG. 6 is an external view showing a conventional thermistor mounting structure.

[Explanation of symbols]

 1 Secondary Battery 11 Projection Electrode 12 Detection Terminal 2 Mounting Plate 21 Hole (Engaging Hole) 211 Projection Part 212 Large Diameter Part (Escape Notch) 213 Escape Notch 22 Notch 23 Groove (Fixing Groove) 3 Temperature Measurement Element 31 Temperature detector 32 Lead wire

Claims (4)

[Claims] 1. A secondary battery in which a temperature sensing element and a temperature sensing element having a plurality of lead wires are mounted via a mounting plate made of an insulating material, wherein the mounting plate is one surface of the secondary battery. An engaging hole fitted to the protruding electrode formed on the, a notch for accommodating the temperature measuring portion of the temperature measuring element, and a continuous state of this notch, and fixing the respective positions of the lead wires of the temperature measuring element. A secondary battery with a temperature measuring element, characterized in that a fixing groove is formed. 2. The thermometer according to claim 1, wherein the engagement hole is formed to have a diameter slightly smaller than the diameter of the protruding electrode, and a plurality of relief notches are formed in the circumferential direction. Secondary battery with element. 3. The secondary battery with a temperature measuring element according to claim 1, wherein the fixing groove is formed in a cross-sectional shape that prevents the lead wire from coming off. 4. The temperature measuring element-equipped battery according to claim 1, wherein the conductive terminals connected to the tip side of the lead wire are arranged in parallel on another surface. Next battery.