CN214625177U

CN214625177U - Electric automobile power battery heater

Info

Publication number: CN214625177U
Application number: CN202120421943.7U
Authority: CN
Inventors: 聂永福; 张慧; 奚杰; 陈宾; 张伟波; 蔡亮; 曾祥兵; 朱红
Original assignee: Chery New Energy Automobile Co Ltd
Current assignee: Chery New Energy Automobile Co Ltd
Priority date: 2021-02-26
Filing date: 2021-02-26
Publication date: 2021-11-05
Anticipated expiration: 2031-02-26

Abstract

The utility model aims at providing an electric automobile power battery heater with two kinds of heating modes. The utility model discloses an electric automobile power battery heater includes insulating casing and is located insulating casing inside a plurality of cores that generate heat, and the key lies in, a plurality of cores that generate heat divide into two sets ofly, and the same group generates heat between the same electrode of core the electricity be connected to draw forth to insulating casing's outside through the wire. Above-mentioned electric automobile power battery heater sets up two sets of cores that generate heat in same insulating casing to draw the electrode of two sets of cores that generate heat by different wires, just so can be according to actual conditions, the core that generates heat of controlling different groups respectively heats the battery module, thereby satisfies the heating demand under the different charge mode, and homoenergetic under the different modes that generate heat realizes the even heating to the battery module, has saved space and casing material simultaneously, has reduced whole weight and cost.

Description

Electric automobile power battery heater

Technical Field

The utility model belongs to the technical field of electric automobile power battery system, concretely relates to electric automobile power battery heater.

Background

With the increasing development of social economy, the energy demand is further improved, the call for new energy technology is higher and higher, and the development of electric automobiles is in the trend. The battery is used as a core part of the electric automobile, and the performance and the service life of the battery directly determine the performance and the cost of the electric automobile. The lithium ion power battery is a main power battery used for electric vehicles due to the advantages of long service life, low self-discharge rate, high specific power, high energy density, no pollution and the like. However, the lithium ion battery has an optimal temperature range problem during discharging, and when the temperature of the battery is too high or too low and exceeds the allowable working temperature range, the discharging capability is sharply reduced, and even the discharging is not allowed.

Lithium ion batteries are charged in a relatively low temperature environment, and LI + is easily precipitated as metallic lithium on the battery negative electrode. This reaction is irreversible, which not only consumes LI + inside the cell, but also the lithium evolved grows in dendritic form on the negative pole of the cell and grows continuously, this growing dendrite presenting the risk of piercing the separator and causing a short circuit of the cell. In order to avoid such a risk, the lithium ion battery is heated when the lithium ion battery needs to be charged in a low temperature environment. Common heating methods of lithium ion batteries include electrical heating film heating, PTC heating, and liquid heating.

The charging of the whole vehicle is divided into slow charging and fast charging. Fill slowly because fill electric pile power is little, can provide the power of heater for little, the power design of heater is just less. The power of the quick charging pile is large, so that the power which can be provided for the heater is large, but the design power of the heater is small, so that the heating can be performed only with small power during quick charging. In order to solve the problem, two sets of heating systems can be designed in the battery system, wherein the low-power heater works during slow charging and the high-power heater works during fast charging.

Due to the PTC heating scheme, the resistance value is increased and the heating power is reduced when the temperature of the heating element rises, so that the heating temperature can be kept in a relatively safe range, and the PTC heating scheme is more adopted. In the existing PTC heating structure, a plurality of heating cores are arranged in an aluminum profile cavity, stainless steel electric conductors are bonded to two end faces of each heating core to serve as electrodes, and after compaction, a lead is led out from the end of the aluminum profile cavity. In the existing PTC heater, one heating cavity is only one heating system, and if the requirements of two sets of heating systems of a battery system are to be met, the heating system can be achieved only by adding an aluminum profile cavity structure. But the space is compact and difficult to realize because of the battery package, or even can increase the heating chamber, also there is the heating chamber not central, and the inhomogeneous problem of module heating.

Disclosure of Invention

The utility model aims at providing an electric automobile power battery heater with two kinds of heating modes.

The utility model discloses an electric automobile power battery heater includes insulating casing and is located insulating casing inside a plurality of cores that generate heat, and the key lies in, a plurality of cores that generate heat divide into two sets ofly, and the same group generates heat between the same electrode of core the electricity be connected to draw forth to insulating casing's outside through the wire.

Above-mentioned electric automobile power battery heater sets up two sets of cores that generate heat in same insulating casing to the electrode with two sets of cores that generate heat is drawn forth by different wires, just so can be according to actual conditions, the core that generates heat that controls different groups respectively heats the battery module, for example say when filling slowly, utilizes the core that generates heat of low power group to heat, and when filling soon, utilizes the core that generates heat of high power group or utilize low power group and power group simultaneously to heat.

Specifically, the same electrodes of the same group of heating cores are electrically connected through metal conducting strips, the metal conducting strips are positioned in the insulating shell and integrally formed by connecting strips positioned on one side of the heating cores and electrode plates connected with the electrodes of the heating cores, and the metal conducting strips are connected with wires led out of the insulating shell. The metal conducting strip is used for connecting the electrode of the heating core, so that the electric automobile power battery heater has the advantages of convenience in linkage, difficulty in bending and breaking and the like, and the reliability of the electric automobile power battery heater can be effectively improved.

Further, the heating cores are arranged in a straight line, and the heating cores of different groups are arranged at intervals. Through the core interval arrangement that generates heat with the different groups, can be when different power that generates heat, the homoenergetic guarantees to heat evenly to battery module.

Furthermore, the metal conducting strips are provided with four metal conducting strips, the metal conducting strips corresponding to different electrodes are respectively positioned on the top surface and the bottom surface of the heating core, and the two connecting strips corresponding to the same electrode of different groups of heating cores are respectively positioned on two opposite sides of the heating core. Like this, the same electrode of the core that generates heat is located the coplanar (the bottom surface or the top surface of the core that generates heat promptly), and different electrodes are located the relative two sides of the core that generates heat respectively (the bottom surface and the top surface of the core that generate heat promptly), just so avoided the risk of short circuit between the different electrodes of the core that generates heat. In addition, two connecting pieces of the same electrode of different groups of heating cores are respectively arranged on two opposite sides of the heating cores, so that the distance between the two connecting pieces is increased, and the risk of short circuit between the same electrodes of different groups of heating cores can be reduced.

Furthermore, in order to facilitate the connection and management of the electrodes of the heating cores and reduce the risk of short circuit between the electrodes of the heating cores of different groups, two wires connecting the electrodes of the heating cores of the same group are led out from the same end of the insulating shell, and two wires connecting the electrodes of the heating cores of different groups are led out from the two opposite ends of the insulating shell.

Further, the insulating shell is composed of a shell and an insulating film wrapping the heating core, so that the insulating requirement on the shell is low, the shell can be made of materials such as aluminum profiles and the like, the strength of the shell is improved, and the heating core inside is protected.

The utility model discloses an integrated in electric automobile power battery heater has two sets of cores that generate heat, can control the power of the core that generates heat in a flexible way to satisfy the heating demand under the different charge mode, and the homoenergetic is realized the even heating to the battery module under the different mode that generates heat, has saved space and casing material simultaneously, has reduced whole weight and cost.

Drawings

Fig. 1 is a schematic view of the overall structure of the battery heater (inverted state).

Fig. 2 is a schematic view of the internal structure of the battery heater.

Fig. 3 is an exploded view of the internal structure of the battery heater.

The figures are numbered: 1. a housing; 2. an insulating film; 3. a heat generating core; 31. a low-power group heating core; 32. a high power group heating core; 4. a metal conductive sheet; 41. connecting sheets; 42. an electrode sheet; 5. a battery module; 6. and (4) conducting wires.

Detailed Description

The following description of the embodiments of the present invention will be made in detail with reference to the accompanying drawings, wherein the embodiments of the present invention are described in detail with reference to the accompanying drawings, for example, the shapes and structures of the respective members, the mutual positions and connection relationships between the respective portions, the functions and operation principles of the respective portions, and the like.

Example 1:

the embodiment provides an electric vehicle power battery heater with two heating modes.

As shown in fig. 1, the electric vehicle power battery heater of this embodiment is fixed to one side of the battery module 5, and includes an insulating housing and a plurality of heating cores located inside the insulating housing, the insulating housing is composed of a shell 1 made of aluminum profile and an insulating film 2 wrapping the heating cores, and the insulating film 2 is used for isolating the electric connection between the heating core 3 and the shell 1, so as to improve the safety.

As shown in fig. 2 and 3, the plurality of heating cores 3 inside the casing 1 are divided into two groups, namely a low-power group heating core 31 and a high-power group heating core 32, the two groups of heating cores 3 are arranged in a straight line, and the heating cores 3 of different groups are arranged at intervals; the same electrodes of the same group of heating cores 3 are electrically connected through a metal conducting strip 4 (specifically, a stainless steel conducting strip can be adopted), the metal conducting strip 4 is positioned in the cavity formed by the insulating film 2 and is bonded on the heating cores 3, the metal conducting strip 4 is integrally formed by a connecting strip 41 positioned on one side of the heating cores 3 and an electrode plate 42 connected with the electrodes of the heating cores 3, and the metal conducting strip 4 is connected with a lead 6 led out to the outside of the insulating shell.

Specifically, the metal conductive sheet 4 has four, correspond respectively the positive pole and the negative pole of the low-power group heating core 31 and the positive pole and the negative pole of the high-power group heating core 32, wherein, the metal conductive sheet 4 that the positive pole of the low-power group heating core 31 is connected, the metal conductive sheet 4 that the positive pole of the high-power group heating core 32 is connected all is located the top surface of the heating core 3, and the metal conductive sheet 4 that the negative pole of the low-power group heating core 31 is connected, the metal conductive sheet 4 that the negative pole of the high-power group heating core 32 is connected all is located the bottom surface of the heating core 3, the connection pieces 41 of two metal conductive sheets 4 corresponding to the positive poles of the different groups heating core 3 are located the relative both sides of the heating core 3 respectively, namely: the connecting sheet 41 of the metal conducting sheet 4 connected with the anode of the low-power group heating core 31 and the connecting sheet 41 of the metal conducting sheet 4 connected with the anode of the high-power group heating core 32 are respectively positioned at two opposite sides of the top surface of the heating core 3, and the connecting sheet 41 of the metal conducting sheet 4 connected with the cathode of the low-power group heating core 31 and the connecting sheet 41 of the metal conducting sheet 4 connected with the cathode of the high-power group heating core 32 are respectively positioned at two opposite sides of the bottom surface of the heating core 3. Thus, the risk of short circuit between different electrodes of the heating core 3 is avoided, and the risk of short circuit between the same electrodes of the heating cores 3 of different groups can be reduced by increasing the distance between the two connecting pieces 41 of the same electrodes of the heating cores 3 of different groups.

In order to facilitate the connection and management of the electrodes of the heating cores 3 and reduce the risk of short circuit between the electrodes of the heating cores 3 of different groups, two wires 6 connecting the positive and negative electrodes of the heating cores 3 of the same group are led out from the same end of the insulating shell, and two wires 6 connecting the positive and negative electrodes of the heating cores 3 of different groups are led out from the opposite ends of the insulating shell.

Above-mentioned electric automobile power battery heater sets up two sets of cores 3 that generate heat in same insulating casing 1 to lead out two sets of cores 3's that generate heat electrode by different wire 6, just so can be according to actual conditions, control the core 3 that generate heat of different groups respectively and heat the battery module, for example say so when filling slowly, utilize the core 3 that generates heat of low power group to heat, and when filling soon, utilize the high power group or utilize the core 3 that generates heat of low power group and power group simultaneously to heat. And through the 3 interval arrangements of the core that generate heat with different groups, can be when different heating power, the homoenergetic guarantees to heat evenly to battery module.

The present invention has been described in detail with reference to the accompanying drawings, and it is apparent that the present invention is not limited by the above embodiments, and various insubstantial improvements can be made without modification to the present invention.

Claims

1. The utility model provides an electric automobile power battery heater, includes insulating casing and is located a plurality of cores that generate heat of insulating casing inside, its characterized in that, a plurality of cores that generate heat divide into two sets ofly, and the same electrode of the core that generates heat of the same group is connected between the electricity to draw forth to insulating casing's outside through the wire.

2. The heater of claim 1, wherein the same electrodes of the same group of heating cores are electrically connected through a metal conductive sheet, the metal conductive sheet is located inside the insulating housing and integrally formed by a connecting sheet located on one side of the heating cores and an electrode sheet connected with the electrodes of the heating cores, and the metal conductive sheet is connected with a lead wire led out of the insulating housing.

3. The heater of claim 2, wherein the heat generating cores are arranged in a line, and different groups of heat generating cores are arranged at intervals.

4. The heater of claim 3, wherein the metal conductive strips are four metal conductive strips, the metal conductive strips corresponding to different electrodes are respectively located on the top surface and the bottom surface of the heating core, and the two connecting strips corresponding to the same electrode of different groups of heating cores are respectively located on two opposite sides of the heating core.

5. The heater of claim 4, wherein the two wires connecting the electrodes of the same group of heating cores are led out from the same end of the insulating housing, and the two wires connecting the electrodes of different groups of heating cores are led out from the opposite ends of the insulating housing.

6. The heater of any one of claims 1-5, wherein the insulating housing comprises a housing and an insulating film covering the heat generating core.