CN214254677U - Battery short-circuiting device, battery pack with battery and vehicle - Google Patents

Abstract

The utility model is suitable for a battery technology field provides a battery short circuit device, battery package and vehicle that have this battery. The battery short-circuit device comprises a first conductor and a second conductor which are used for short-circuiting the battery when the battery is conducted and disconnecting the external circuit of the battery, and the first conductor and the second conductor are respectively used for being connected with the anode and the cathode of the battery; the battery also comprises a heat conduction box connected with the battery body; the heat conduction box is provided with a first cavity, a first filler and a second filler are arranged in the first cavity, the first filler enables the pressure intensity in the first cavity to be increased within a set temperature range, the heat conduction box is provided with a pressure relief structure, and the second filler enables the first conductor and the second conductor to be conducted. The battery is provided with the battery short-circuiting device. The battery pack and the vehicle have the above battery. When the pressure relief structure is opened when the temperature reaches a set range, the second filler is discharged to enable the first conductor and the second conductor to be conducted, so that the anode and the cathode of the battery are in short circuit, an external circuit of the battery is automatically disconnected when the battery is in short circuit, charging is stopped, and safety and reliability are good.

Description

Battery short-circuiting device, battery pack with battery and vehicle

Technical Field

The utility model belongs to the technical field of the battery, especially, relate to a battery short circuit device, battery, have battery package and vehicle of this battery.

Background

The lithium ion battery is overcharged to cause the danger of bursting, firing, explosion, etc., at present, the traditional method for solving the overcharge is to install safety devices, such as an explosion-proof valve and other expansion detection devices, but the devices can play a role when more gas is generated in the battery, namely when the internal pressure of the battery is higher.

However, the gas production rate inside the battery changes with the overcharge degree and the temperature of the battery, the higher the overcharge degree, the higher the temperature, the higher the gas production rate, and the higher the internal pressure of the battery, when the internal pressure of the battery reaches a level at which a safety device can be started, the temperature inside the battery may already be high, which may not prevent further reaction of the internal materials of the battery at a high temperature and safety problems such as thermal runaway of the battery caused subsequently, and the safety reliability is not good.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to avoid the inside high temperature of battery and lead to the battery thermal runaway's of the further reaction of battery inner material under the high temperature problem that causes, provide a battery short circuit device, battery, have battery package and the vehicle of this battery, its safety device that can in time trigger, in time prevent the inside reaction of battery, fail safe nature is good.

The technical scheme of the utility model is that: a battery short-circuit device comprises a first conductor and a second conductor which are used for short-circuiting a battery when the battery is conducted and disconnecting an external circuit of the battery, wherein the first conductor and the second conductor are respectively used for being connected with a battery positive electrode and a battery negative electrode; the battery short-circuit device also comprises a heat conduction box connected with the battery body; the heat conduction box is provided with a first cavity, fillers are arranged in the first cavity, the fillers comprise first fillers which enable the pressure intensity in the first cavity to be increased within a set temperature range, the heat conduction box is provided with a pressure relief structure which is opened when the pressure intensity in the first cavity reaches a set value, the fillers further comprise second fillers which are discharged from the pressure relief structure when the pressure relief structure is opened and enable the first conductor and the second conductor to be communicated, and the first conductor and the second conductor are arranged outside the first cavity.

Optionally, a second cavity is further disposed in the heat conducting box, the second cavity is separated from the first cavity by a partition, the pressure relief structure is disposed on the partition, and the first conductor and the second conductor extend into the second cavity.

Optionally, the pressure relief structure is a scored structure on the partition board, and the thickness of the thinnest part of the scored structure is 10 to 200 μm.

Optionally, the thickness of the score structure at the thinnest point is 30 to 50 μm.

Optionally, one side of the heat conduction box, which faces the battery, is a bottom surface, the bottom surface of the heat conduction box is provided with an opening communicated with the second cavity, the bottom surface of the heat conduction box is provided with a heat conduction adhesive layer bonded to the battery body, and the first conductor and the second conductor are limited by the heat conduction adhesive layer.

Optionally, wire holes communicated with the second chamber are formed in two opposite sides of the heat conduction box, the first conductor and the second conductor respectively penetrate through the wire holes in the two opposite sides of the heat conduction box, the end portions of the first conductor and the second conductor located in the second chamber are close to or arranged in parallel at intervals, and the minimum distance between the first conductor and the second conductor is 1-50 mm.

Optionally, the first filler is a substance which can decompose to generate gas at 50 to 150 ℃; the second filler is conductive powder.

Optionally, the volume of the filler is at least 10% of the volume of the first chamber space.

Optionally, the volume of the filler is at least 80% to 100% of the volume of the first chamber space.

Optionally, a heat conducting adhesive layer is arranged on the surface of the cover plate, the heat conducting box is arranged on the heat conducting adhesive layer, the first conductor and the second conductor are sleeved with an insulating sleeve shell, and the insulating sleeve shell is positioned by the heat conducting adhesive layer; the charging circuit of the battery body is provided with a fuse.

The utility model also provides a battery, the battery includes battery body and foretell battery short-circuiting device, battery body has apron, battery positive pole and battery negative pole, the battery positive pole with the battery negative pole set up in the apron, first conductor connect in the battery is anodal, the second conductor connect in the battery negative pole.

The utility model also provides a battery package, battery package has foretell battery.

The utility model also provides a vehicle, the vehicle has foretell battery, or has as above-mentioned a battery package.

The utility model provides a battery short-circuit device, a battery, battery package and vehicle that have this battery, when the temperature of battery is higher relatively, for example when the battery overcharges and leads to the inside temperature rise of battery, make heat conduction box temperature rise under heat-conducting effect, and then make the temperature rise in the first cavity, temperature rise to settlement temperature range in the first cavity, a large amount of gas are produced to first filler, produce higher interior pressure in the first cavity and make pressure release structure open, gaseous first cavity of pressure release structure discharge can be followed, the second filler also will be along with gaseous from pressure release structure discharge and fall in first conductor and second conductor, and then make first conductor, second conductor switch on and make the positive negative pole short circuit of battery, the outer circuit of battery is automatic disconnection when the battery short circuit, terminate and charge, the fail safe nature of battery has been improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic perspective view illustrating a battery short-circuiting device connected to a battery cover plate according to an embodiment of the present invention;

fig. 2 is a schematic perspective view illustrating a battery short-circuiting device according to an embodiment of the present invention;

fig. 3 is a schematic perspective view of a battery short-circuiting device according to an embodiment of the present invention;

fig. 4 is a schematic perspective view illustrating a heat conducting box of a battery short-circuiting device according to an embodiment of the present invention with a top cover and a filler removed;

fig. 5 is a schematic perspective view illustrating a lead wire arrangement manner in a battery short-circuiting device according to an embodiment of the present invention;

fig. 6 is a schematic perspective view of a heat conduction box in a battery short-circuiting device according to an embodiment of the present invention when a top cover and two opposite side plates are removed.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present.

It should be noted that the terms of orientation such as left, right, up and down in the embodiments of the present invention are only relative to each other or are referred to the normal use state of the product, and should not be considered as limiting.

As shown in fig. 1 to 6, a battery short-circuiting device (short-circuiting box) according to an embodiment of the present invention includes a first conductor 21 and a second conductor 22, which short-circuit a battery when the battery is turned on and disconnect an external circuit of the battery, wherein the first conductor 21 is used for connecting a battery anode 91, the second conductor 22 is used for connecting a battery cathode 92, and the external circuit may be a charging circuit. The short-circuiting device further includes a heat conductive case 10 connected to the battery body. The heat conduction box 10 has a first chamber 110, wherein the first chamber 110 is provided with a filler 50, and the filler 50 includes a first filler, and the first filler can increase the internal pressure of the first chamber 110 within a set temperature range. The heat conduction box 10 is provided with a pressure relief structure 131 which is opened when the internal pressure of the first chamber 110 reaches a set value, the filler 50 further includes a second filler, the second filler is discharged from the pressure relief structure 131 when the pressure relief structure 131 is opened, and the first conductor 21 and the second conductor 22 are conducted, and the first conductor 21 and the second conductor 22 are arranged outside the first chamber 110. The first filler can decompose or gasify to generate gas to increase the pressure of the first chamber 110 when the temperature of the battery is higher than a set temperature, for example, when the temperature inside the battery rises due to overcharge of the battery, the temperature of the heat conduction box 10 rises under the action of heat conduction, so that the temperature inside the first chamber 110 rises, when the temperature inside the first chamber 110 rises to the decomposition/gasification temperature of the filler 50 (generally 50-150 ℃), the first filler generates a large amount of gas, the first chamber 110 generates high internal pressure to open the pressure relief structure 131, the gas can be discharged (jetted) from the pressure relief structure 131 to the first chamber 110, the second filler is also discharged (jetted) from the pressure relief structure 131 along with the gas and falls on the first conductor 21 and the second conductor 22, so that the first conductor 21 and the second conductor 22 are conducted to be short-circuited, when the battery is short-circuited, an external circuit (charging circuit) of the battery is automatically disconnected (for example, by means of fuse blowing and the like), and the charging is stopped, so that the safety and reliability of the battery are improved. Different from the structure that the circuit is directly broken by high voltage, the battery provided by the embodiment is more convenient to install and modify in the existing battery by fusing the external circuit fuse through the short circuit of the battery, the first conductor 21 and the second conductor 22 are directly connected to the battery anode and the battery cathode of the battery, and the battery can be used for short circuit fusing devices (such as fuses and fuses) of the primary battery, and is low in application cost.

Specifically, still be provided with second cavity 120 in the heat conduction box 10, second cavity 120 with be separated by baffle 130 between the first cavity 110, pressure relief structure 131 set up in on the baffle 130, first conductor 21 with second conductor 22 stretches into in the second cavity 120, when pressure relief structure 131 opened, form the pressure release hole, the pressure release hole communicates first cavity 110 and second cavity 120, easily piles up on first conductor 21, second conductor 22 after electrically conductive second filler spouts, second cavity 120 can prevent the loss of second filler, can reduce the filling volume of second filler, does benefit to and makes product structure compact, also does benefit to and reduces application cost.

Specifically, the pressure relief structure 131 is a scored structure on the partition 130, and the thickness of the thinnest part of the scored structure is 10 to 200 μm. Preferably, the thickness of the score structure at the thinnest point may be 30 to 50 μm. Of course, the pressure relief structure 131 may be an explosion-proof valve (pressure valve) or the like. When the pressure relief structure 131 is used for relieving pressure, a second filler is injected into the second chamber 120 from the first chamber 110, a certain high pressure is ensured in the first chamber 110, the thinner the thickness of the partition 130 at the thinnest notch is, the earlier the pressure relief structure 131 is opened, the lower the required pressure relief pressure is, and the less the second filler can be injected; conversely, the thicker the thickness of the separator 130 at the thinnest score, the later the opening time, the higher the pressure relief pressure, and the more the filler 50 can be sprayed, but the later the opening time means the higher the degree of overcharge of the battery, and the lower the safety of the battery. The thickness of the spacer 130 at the thinnest point of the notch is reasonably thick, so that the second filler which can be sprayed during the pressure relief can be ensured to meet the purpose of electrically connecting the wires (the first conductor 21 and the second conductor 22), and the pressure relief structure 131 can be ensured to be opened as soon as possible, so that the thickness of the spacer 130 at the thinnest point of the notch can be 10 to 200 μm, preferably 30 to 50 μm.

Specifically, one of the first conductor 21 and the second conductor 22 may be connected to the positive electrode 91 of the battery, and the other may be connected to the negative electrode 92 of the battery, and the charging circuit may be provided with a fuse, and when the first conductor 21 and the second conductor 22 are electrically conducted, the external circuit is in a short-circuit state, and the fuse may be automatically blown in time.

Specifically, one surface of the heat conduction box 10 facing the battery body is a bottom surface, the bottom surface of the heat conduction box 10 is provided with an opening communicated with the second cavity 120, that is, the bottom surface of the second cavity 120 is also provided with an opening, the bottom surface of the heat conduction box 10 is provided with a heat conduction adhesive layer 30 bonded to the battery body, and the heat conduction adhesive layer 30 may be located at the opening of the bottom surface of the second cavity 120, so that the first conductor 21 and the second conductor 22 are limited by the heat conduction adhesive layer 30. The heat conductive adhesive layer 30 is made of a heat conductive and electrically nonconductive material, such as silicone sealant. The thermal conductive adhesive layer 30 functions to fix the wires (the first and second conductors 21 and 22) and the short box. The lead comprises a conductive core 202 and an insulating shell 201, wherein the conductive core 202 is partially exposed on the heat conducting adhesive layer 30, and the heat conducting adhesive layer 30 can realize heat conduction and also can play a role in fixing the heat conducting box 10, the first conductor 21 and the second conductor 22.

Specifically, the two opposite sides of the heat conducting box 10 are provided with wire holes 101 communicated with the second chamber 120, the first conductor 21 and the second conductor 22 respectively pass through the wire holes 101 of the two opposite sides of the heat conducting box 10, the end parts of the first conductor 21 and the second conductor 22 are arranged close to or in parallel at intervals, and the minimum distance between the first conductor 21 and the second conductor 22 is 1 to 50mm, that is, the first conductor 21 and the second conductor 22 are in a state of no contact but close to each other in a normal state. Preferably, the distance between the first conductor 21 and the second conductor 22 is 1 to 5 mm. The first conductor 21 and the second conductor 22 may be disposed with their end portions facing each other (as shown in fig. 5), or the first conductor 21 and the second conductor 22 may be disposed in parallel with a distance therebetween, and a second filler which is sprayed and electrically conductive facilitates electrical conduction between the first conductor 21 and the second conductor 22.

Specifically, the first filler is a substance which can be decomposed at 50 to 150 ℃ to generate gas. Such as ammonium carbonate, ammonium bicarbonate, sodium bicarbonate, potassium bicarbonate, and the like. In this embodiment, the first filler includes at least one of ammonium carbonate, ammonium bicarbonate, sodium bicarbonate, and potassium bicarbonate.

Specifically, the second filler may be conductive powder, and is not easy to block the pressure relief structure 131 when being ejected from the pressure relief structure 131.

Specifically, the second filler may include at least one of conductive metal powder, conductive alloy powder, metal carbide, organic conductive substance powder, graphite powder, and conductive carbon black powder.

Specifically, the volume of the filler is at least 10% of the volume of the first chamber 110 space. Preferably, the volume of the filler is at least 80% to 100% of the volume of the first chamber 110, because the space in the battery pack is limited, the smaller the short-circuit box is, the better, and to ensure that the pressure relief structure 131 can be opened smoothly, the higher the volume of the filler 50 (the first filler and the second filler) is, the better, so that the structure is compact.

Specifically, the ratio of the mass of the first filler to the mass of the filler is 1% to 90%, and preferably, the ratio of the mass of the first filler to the mass of the filler is 5% to 50%.

In the embodiment, the mass ratio of the first filler to the filler is 10 to 30 percent; the first filler is one or two of ammonium carbonate and ammonium bicarbonate, and the second filler is graphite powder and conductive carbon black powder.

The content of the first filler is not preferably too high because a very small amount of the first filler can be decomposed to generate a large volume of gas, but a certain time difference is provided in consideration of the fact that the first filler is not decomposed at the same time, and therefore, in order to ensure that the initially decomposed first filler can provide enough gas for opening the pressure relief structure 131, the proportion of the first filler is not too low, and thus the mass proportion of the first filler in the filler 50 may be 1 to 90%, preferably 5 to 50%, and more preferably 10 to 30%.

Specifically, the first conductor 21 and the second conductor 22 are sheathed with an insulating sheath positioned by the layer of thermally conductive adhesive 30; the charging circuit of the battery body is provided with a fuse.

The battery of the present embodiment is exemplified by a lithium ion battery, of course, other types of batteries may also be used, when the temperature inside the battery rises due to overcharge of the battery, the temperature of the cover plate 90 rises due to heat conduction, and further the temperature of the short circuit box rises, when the temperature in the first cavity 110 of the short circuit box rises to the decomposition temperature of the first filler, the first filler is decomposed to generate a large amount of gas, thereby generating high pressure, the pressure relief structure 131 is opened to relieve the pressure, the second filler in the first cavity 110 is sprayed into the second cavity 120 during the pressure relief and falls on the heat conductive adhesive layer 30, so that the two wires are electrically conducted through the second filler, thereby shorting the battery, fusing the fuse of the external circuit, terminating the charging, and improving the overcharge safety of the battery.

The short circuit box is described in further detail below by way of specific several experiments as an example and with reference to the accompanying drawings.

Experimental example 1: the heat conduction box 10 and the partition 130 of the short circuit box are made of aluminum metal, the explosion-proof valve (pressure relief structure 131) is made on the partition 130 in a scoring mode, the thickness of the partition 130 at the thinnest scoring position is 50 micrometers, and the inner space of the box is divided into the first cavity 110 and the second cavity 120 through the partition 130. The fillers 50 of the first chamber 110 are graphite powder and ammonium carbonate powder, wherein the mass of the ammonium carbonate powder accounts for 30% of the total mass of the fillers 50, and the total volume of the fillers 50 (the first fillers and the second fillers) accounts for 80% of the volume of the first chamber 110. Coating an organic silicon sealant on a cover plate 90, placing a short circuit box on the organic silicon sealant to realize fixation, respectively connecting a first conductor 21 and a second conductor 22 to a positive pole (a battery positive pole 91) and a negative pole (a battery negative pole 92), respectively penetrating the other ends of the wires into a second chamber 120 from a wire hole 101 of the second chamber 120, and fixing a tail end exposed conductive core on the organic silicon sealant, wherein the end part of the first conductor 21 and the end part of the second conductor 22 are placed in a head-to-head manner, and the distance between the end part of the first conductor 21 and the end part of the conductive core of the second conductor 22 is 1mm, so that the cover plate A1 containing the short circuit box is manufactured. The lithium cobaltate is used as a positive electrode active material to manufacture a positive plate, the graphite is used as a negative electrode active material to manufacture a negative plate, the positive plate and a ceramic diaphragm prepared pole core are arranged in a battery shell, then a cover plate A1 is assembled, and liquid injection is carried out to package the novel lithium ion battery S10.

Experimental example 2: the heat conduction box 10 and the partition 130 of the short circuit box are made of aluminum metal, the explosion-proof valve is made on the partition 130 in a scoring mode, the thickness of the partition 130 at the thinnest scoring position is 30 micrometers, and the space in the box is divided into the first chamber 110 and the second chamber 120 through the partition 130. The filler 50 of the first chamber 110 is graphite powder and ammonium carbonate powder, wherein the mass of the ammonium carbonate powder accounts for 10% of the total mass of the filler 50, and the total volume of the filler 50 accounts for 100% of the volume of the first chamber 110. Coating an organic silicon sealant on the cover plate 90, placing the short circuit box on the organic silicon sealant to realize fixation, connecting the wires to the positive pole and the negative pole respectively, penetrating the other ends of the wires into the second cavity 120 from the wire holes 101 of the second cavity 120 respectively, and fixing the conductive core with the exposed tail end on the organic silicon sealant, wherein the end part of the first conductor 21 and the end part of the conductive core of the second conductor 22 are placed in parallel, and the distance between the end part of the first conductor 21 and the end part of the conductive core of the second conductor 22 is 2 mm. A lid a2 containing a short circuit box was made. The lithium cobaltate is used as a positive electrode active material to manufacture a positive plate, the graphite is used as a negative electrode active material to manufacture a negative plate, the positive plate and a ceramic diaphragm prepared pole core are arranged in a battery shell, then a cover plate A2 is assembled, and liquid injection is carried out to package the novel lithium ion battery S20.

Experimental example 3: the heat conduction box 10 of the short circuit box is made of stainless steel, the partition plate 130 is made of metal aluminum, the explosion-proof valve is made on the partition plate 130 in a scoring mode, the thickness of the partition plate 130 at the thinnest point of the scoring is 40 micrometers, and the space in the box is divided into the first cavity 110 and the second cavity 120 through the partition plate 130. The filler 50 of the first chamber 110 is conductive carbon black powder and ammonium bicarbonate powder, wherein the mass of the ammonium carbonate powder accounts for 20% of the total mass of the filler 50, and the total volume of the filler 50 accounts for 90% of the volume of the first chamber 110. Coating the organic silicon sealant on the cover plate 90, placing the short circuit box on the organic silicon sealant to realize fixation, connecting the wires to the positive pole and the negative pole respectively, penetrating the other ends of the wires into the second chamber 120 from the wire holes 101 of the second chamber 120 respectively, and fixing the conductive core with the exposed tail end on the organic silicon sealant, wherein the end part of the first conductor 21 and the end part of the conductive core of the second conductor 22 are placed in a head-to-head manner, and the distance between the end part of the first conductor 21 and the end part of the conductive core of the second conductor 22 is 5 mm. A lid a3 containing a short circuit box was made.

The lithium cobaltate is used as a positive electrode active material to manufacture a positive plate, the graphite is used as a negative electrode active material to manufacture a negative plate, the positive plate and a ceramic diaphragm prepared pole core are arranged in a battery shell, then a cover plate A3 is assembled, and liquid injection is carried out to package the novel lithium ion battery S30.

Comparative experimental example 1: a battery sample DS10 was produced according to the method in experimental examples 1 to 3, except that the cover plate used was a normal cover plate and did not contain a short-circuiting box.

The overcharge resistance test adopted in the experiment is carried out on a charge and discharge tester, the battery S10, the battery S20, the battery S30 and the battery sample DS10 are charged to 4.3V at a multiplying power of 0.1C, the constant current charging is carried out at a multiplying power of 1C after the static placement for 5min, and the state of the battery is observed. Here, the battery S10 fused the fuse at the 28 th minute, and the charging was terminated. The DS10 battery sample is fused at the external circuit fuse of the 40 th minute, the charging is terminated, the explosion-proof valve is opened at the 46 th minute, the fire and explosion occur at the 47 th minute, the fusing time of the external circuit fuses of the battery S20 and the battery S30 is less than 46 minutes, and the fire and explosion do not occur at all, the DS10 battery adopting the common cover plate is fused at the external circuit fuse of the 40 th minute, so that the charging is terminated, but the internal short circuit of the battery is serious due to too high overcharge degree, the heat and gas generation of the battery continuously accumulate along with the continuous generation of the internal reaction of the battery, the explosion-proof valve is opened at the 46 th minute, and the fire and explosion occur at the 47 th minute. In the S10, S20 and S30 battery using the short circuit box provided in this embodiment, because the internal temperature of the battery rises during overcharge, the temperature of the current collector and the terminal rises, and the heat is conducted to the cover plate 90 and the short circuit box, so that the first filler ammonium carbonate in the first chamber 110 of the short circuit box decomposes to generate gas, the generated high pressure causes the explosion-proof valve to burst and release the pressure, and the second filler graphite powder in the first chamber 110 is injected into the second chamber 120 and falls on the heat-conducting glue layer 30, so that the end of the first conductor 21 and the end of the conductive core of the second conductor 22 are electrically conducted through the second filler, and the battery is short-circuited at 28 th minute, thereby fusing the external circuit fuse, terminating charging, and improving the overcharge safety of the battery.

The embodiment of the utility model provides a battery is still provided, the battery includes battery body and above-mentioned short-circuiting device, battery body has apron 90, battery positive pole 91 and battery negative pole 92, battery positive pole 91 with battery negative pole 92 is fixed in apron 90, battery short-circuiting device's first conductor 21 connect in battery positive pole 91, battery short-circuiting device's second conductor 22 connect in battery negative pole 92. When the temperature of the battery is relatively high, for example, when the temperature inside the battery rises due to abnormal overcharge of the battery, the temperature of the box body 10 rises under the action of heat conduction, so that the temperature of the cavity of the box body 10 rises, when the temperature in the cavity rises to the decomposition temperature of the filler (10-150 ℃), the filler in the cavity is decomposed to generate a large amount of gas, and high internal pressure is generated in the cavity, so that the pressure relief structure 131 is opened for pressure relief, the second filler in the first cavity 110 is sprayed into the second cavity 120 and falls on the heat-conducting glue layer 30 during pressure relief, so that the first conductor 21 and the second conductor 22 are conducted, at the moment, the battery is short-circuited, an external circuit is automatically disconnected, the charging is terminated, and the safety and reliability of the battery are improved.

In a particular application, the cover plate 90 may also be provided with a circuit breaking device (e.g., a flip-flop) that can also be opened during charging if the battery is shorted. In a specific application, if the temperature of the battery is too high, the battery short-circuit device is triggered firstly to disconnect an external circuit, and if the battery short-circuit device fails, the circuit-breaking device can be used as a second safety barrier, so that the safety and reliability are better.

The embodiment of the utility model provides a battery package is still provided, battery package has foretell battery.

The embodiment of the utility model provides a vehicle is still provided, the vehicle has foretell battery or above-mentioned battery package.

The embodiment of the present invention provides a battery short-circuiting device, a battery pack having the battery and a vehicle, when the temperature of the battery is relatively high, for example, when the temperature inside the battery rises due to overcharge of the battery, the temperature of the heat conduction box 10 rises under the effect of heat conduction, so as to raise the temperature inside the first chamber 110, when the temperature inside the first chamber 110 rises to the decomposition/gasification temperature of the filler 50 (set temperature range), the first filler generates a large amount of gas, the high internal pressure inside the first chamber 110 opens the pressure relief structure 131, the gas can be discharged (sprayed) from the pressure relief structure 131 to the first chamber 110, the second filler also discharges (sprays) along with the gas from the pressure relief structure 131 and falls on the first conductor 21 and the second conductor 22, so that the first conductor 21 and the second conductor 22 are conducted to short-circuit the positive and negative electrodes of the battery, when the battery is short-circuited, an external circuit (charging circuit) of the battery is automatically disconnected (for example, by means of fuse blowing and the like), and the charging is stopped, so that the safety and reliability of the battery are improved.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modification, equivalent replacement or improvement made within the spirit and principle of the present invention should be included in the present invention.

Claims (12)

1. A battery short-circuiting device is characterized by comprising a first conductor and a second conductor which are used for short-circuiting a battery when the battery is conducted and disconnecting an external circuit of the battery, wherein the first conductor and the second conductor are respectively used for being connected with a battery positive electrode and a battery negative electrode; the battery short-circuit device also comprises a heat conduction box connected with the battery body; the heat conduction box is provided with a first cavity, fillers are arranged in the first cavity, the fillers comprise first fillers which enable the pressure intensity in the first cavity to be increased within a set temperature range, the heat conduction box is provided with a pressure relief structure which is opened when the pressure intensity in the first cavity reaches a set value, the fillers further comprise second fillers which are discharged from the pressure relief structure when the pressure relief structure is opened and enable the first conductor and the second conductor to be communicated, and the first conductor and the second conductor are arranged outside the first cavity.

2. The battery short-circuiting device according to claim 1, wherein a second chamber is further provided in said heat conducting box, said second chamber is separated from said first chamber by a partition, said pressure relief structure is provided on said partition, and said first conductor and said second conductor extend into said second chamber.

3. The battery short-circuiting device according to claim 2, wherein said pressure relief structure is a notch structure on said separator, and the thickness of the thinnest portion of said notch structure is 10 to 200 μm.

4. A battery shorting device according to claim 3, wherein the thinnest portion of the score structure has a thickness of 30 to 50 μm.

5. The battery short-circuiting device according to claim 2, wherein a surface of said heat conducting case facing said battery is a bottom surface, said bottom surface of said heat conducting case is provided with an opening communicating with said second chamber, said bottom surface of said heat conducting case is provided with a heat conducting adhesive layer adhered to said battery body, and said first conductor and said second conductor are limited by said heat conducting adhesive layer.

6. The battery short-circuiting device according to claim 5, wherein said heat conducting case has wire holes communicating with said second chamber at opposite sides thereof, said first conductor and said second conductor are respectively passed through said wire holes at opposite sides of said heat conducting case, and ends of said first conductor and said second conductor located in said second chamber are disposed close to or in parallel at intervals, and a minimum distance between said first conductor and said second conductor is 1 to 50 mm.

7. The battery short-circuiting device according to any one of claims 1 to 6, wherein said first filler is a substance decomposable at 50 to 150 ℃ to generate a gas; the second filler is conductive powder.

8. A battery short-circuiting device according to any one of claims 1 to 6, wherein said filler occupies at least 10% of the volume of said first chamber space.

9. A battery short-circuiting device according to any one of claims 1 to 6, wherein said filler occupies at least 80% to 100% of the volume of said first chamber space.

10. A battery comprising a battery body and a battery shorting device as claimed in any one of claims 1 to 9, the battery body having a cover plate, a battery positive electrode and a battery negative electrode, the battery positive electrode and the battery negative electrode being disposed on the cover plate, the first conductor being connected to the battery positive electrode and the second conductor being connected to the battery negative electrode.

11. A battery pack, characterized in that the battery pack has a battery according to claim 10.

12. A vehicle having a battery as claimed in claim 10, or having a battery pack as claimed in claim 11.

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